/* ============================================
   人性操作系统 · 墨 INK — Editorial Design
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400;1,700&family=Inter:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  /* Ink & Paper Palette */
  --paper: #FAF9F6;
  --paper-warm: #F5F3EE;
  --paper-dark: #EDEAE3;
  --ink: #0C0C0C;
  --ink-soft: #2D2D2D;
  --ink-muted: #6B6B6B;
  --ink-faint: #A8A8A0;
  --vermilion: #C41E3A;
  --vermilion-light: #E8354F;
  --vermilion-glow: rgba(196, 30, 58, 0.08);
  --vermilion-glow-strong: rgba(196, 30, 58, 0.15);
  --border: rgba(12, 12, 12, 0.08);
  --border-strong: rgba(12, 12, 12, 0.15);

  /* Dark theme overrides */
  --bg: var(--paper);
  --bg-surface: #FFFFFF;
  --bg-elevated: #FFFFFF;
  --text: var(--ink);
  --text-secondary: var(--ink-muted);
  --text-tertiary: var(--ink-faint);
  --bg-base: var(--paper);

  /* Typography */
  --font-display: 'Playfair Display', 'Noto Serif SC', 'Georgia', serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  --font-serif-cn: 'Noto Serif SC', 'SimSun', serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* Scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  --space-4xl: 128px;

  /* Layout */
  --max-width: 1280px;
  --nav-height: 64px;
  --ease: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Cloudflare Snippet Overrides */
  --search-snippet-primary-color: var(--vermilion);
  --search-snippet-primary-hover: var(--vermilion-light);
}

/* Dark Theme */
[data-theme="dark"] {
  --bg: #0C0C0C;
  --bg-surface: #161616;
  --bg-elevated: #1E1E1E;
  --bg-base: #0C0C0C;
  --text: #F5F3EE;
  --text-secondary: #8A8A82;
  --text-tertiary: #666;
  --ink-faint: #555;
  --border: rgba(245, 243, 238, 0.08);
  --border-strong: rgba(245, 243, 238, 0.15);
  --vermilion-glow: rgba(196, 30, 58, 0.12);
  --vermilion-glow-strong: rgba(196, 30, 58, 0.2);
  --paper-warm: #111;
  --paper-dark: #1A1A1A;
}

/* ============ Reset ============ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.5s var(--ease), color 0.3s var(--ease);
  line-height: 1.6;
}

::selection {
  background: var(--vermilion);
  color: white;
}

/* ============ Background Texture ============ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, var(--vermilion-glow) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] body::before {
  background-image:
    radial-gradient(circle at 20% 50%, var(--vermilion-glow) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(196, 30, 58, 0.03) 0%, transparent 40%);
}

/* ============ Navigation ============ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(250, 249, 246, 0.85);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: all 0.3s var(--ease);
}

[data-theme="dark"] .navbar {
  background: rgba(12, 12, 12, 0.85);
}

.nav-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.logo-mark {
  position: relative;
  width: 36px;
  height: 36px;
}

.logo-mark .circle {
  width: 36px;
  height: 36px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  transition: border-color 0.3s var(--ease);
}

[data-theme="dark"] .logo-mark .circle {
  border-color: var(--text);
}

.logo-mark .dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  background: var(--vermilion);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: dotPulse 3s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%, -50%) scale(1.3); opacity: 0.7; }
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-main {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}

.logo-sub {
  font-size: 10px;
  font-weight: 500;
  color: var(--ink-faint);
  letter-spacing: 2px;
  text-transform: uppercase;
}

[data-theme="dark"] .logo-sub {
  color: var(--ink-faint);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s var(--ease);
}

.nav-btn:hover {
  background: var(--vermilion);
  color: white;
  border-color: var(--vermilion);
  transform: scale(1.05);
}

[data-theme="dark"] .nav-btn {
  color: var(--text-secondary);
  border-color: var(--border-strong);
}

[data-theme="dark"] .nav-btn:hover {
  background: var(--vermilion);
  color: white;
}

.lang-toggle {
  width: auto;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-body);
  letter-spacing: 0.5px;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-2xl)) var(--space-lg) var(--space-2xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Large decorative character */
.hero-deco {
  position: absolute;
  top: 50%;
  right: -60px;
  transform: translateY(-50%);
  font-family: var(--font-serif-cn);
  font-size: clamp(200px, 25vw, 400px);
  font-weight: 900;
  color: var(--border);
  opacity: 0.4;
  line-height: 1;
  pointer-events: none;
  user-select: none;
  writing-mode: vertical-rl;
  z-index: 0;
}

[data-theme="dark"] .hero-deco {
  opacity: 0.08;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--vermilion);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  padding-left: 48px;
  position: relative;
}

.hero-eyebrow::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 36px;
  height: 2px;
  background: var(--vermilion);
  transform: translateY(-50%);
}

.hero-title {
  margin-bottom: var(--space-lg);
}

.hero-title .line-cn {
  font-family: var(--font-serif-cn);
  font-size: clamp(48px, 8vw, 88px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -2px;
  color: var(--text);
  display: block;
  margin-bottom: var(--space-sm);
}

.hero-title .line-en {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.5vw, 40px);
  font-weight: 400;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--ink-faint);
  display: block;
}

[data-theme="dark"] .hero-title .line-en {
  color: var(--ink-muted);
}

.hero-desc {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: var(--space-xl);
}

.hero-desc strong {
  color: var(--vermilion);
  font-weight: 600;
}

/* Stats row - editorial style */
.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: var(--space-xl);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 var(--space-xl);
  position: relative;
}

.stat:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: var(--border-strong);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
  color: var(--text);
  letter-spacing: -1px;
}

.stat-icon {
  color: var(--vermilion);
  margin-bottom: 6px;
  opacity: 0.7;
}

.stat-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* Buttons - editorial style */
.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .btn-primary {
  background: var(--paper);
  color: var(--ink);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--vermilion);
  transform: translateX(-101%);
  transition: transform 0.4s var(--ease);
}

.btn-primary:hover::before {
  transform: translateX(0);
}

.btn-primary span, .btn-primary svg {
  position: relative;
  z-index: 1;
}

.btn-primary:hover {
  color: white;
}

[data-theme="dark"] .btn-primary:hover {
  color: white;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s var(--ease);
}

.btn-secondary:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

[data-theme="dark"] .btn-secondary:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

/* ============ Section Divider ============ */
.section-divider {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section-divider hr {
  border: none;
  height: 1px;
  background: var(--border-strong);
}

/* ============ Modules Section ============ */
.modules {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
  gap: var(--space-lg);
}

.section-header .label {
  font-size: 12px;
  font-weight: 600;
  color: var(--vermilion);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.section-header h2 {
  font-family: var(--font-serif-cn);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
}

.section-header .count {
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--ink-faint);
  font-style: italic;
  white-space: nowrap;
}

/* Modules Grid - Asymmetric */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.module-card {
  background: var(--bg-surface);
  padding: var(--space-xl);
  cursor: default;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--vermilion);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
  border-radius: 16px 16px 0 0;
}

.module-card:hover::before {
  transform: scaleX(1);
}

.module-card:hover {
  background: var(--bg-elevated);
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transform: translateY(-4px);
  border-color: var(--border-strong);
}

[data-theme="dark"] .module-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.module-num {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
  color: var(--border-strong);
  margin-bottom: var(--space-md);
  transition: color 0.3s var(--ease);
}

[data-theme="dark"] .module-num {
  color: rgba(245, 243, 238, 0.1);
}

.module-card:hover .module-num {
  color: var(--vermilion-glow-strong);
}

[data-theme="dark"] .module-card:hover .module-num {
  color: rgba(196, 30, 58, 0.3);
}

.module-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  margin-bottom: var(--space-md);
  color: var(--vermilion);
  transition: all 0.3s var(--ease);
  background: var(--vermilion-glow);
}

.module-card:hover .module-icon {
  background: var(--vermilion);
  color: white;
  border-color: var(--vermilion);
  transform: scale(1.05);
  border-color: var(--vermilion);
}

.module-card h3 {
  font-family: var(--font-serif-cn);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.3px;
}

.module-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.module-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-md);
}

.module-card .tag {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  background: var(--vermilion-glow);
  color: var(--vermilion);
  border-radius: 20px;
  letter-spacing: 0.3px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.module-card:hover .tag {
  border-color: var(--vermilion-glow-strong);
}

/* Featured module - spans 2 cols */
.module-card.featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.module-card.featured .module-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.module-card.featured .visual-ring {
  width: 120px;
  height: 120px;
  border: 2px solid var(--border-strong);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.module-card.featured .visual-ring::before {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1px solid var(--vermilion);
  border-radius: 50%;
  opacity: 0.5;
}

.module-card.featured .visual-ring .ring-text {
  font-family: var(--font-serif-cn);
  font-size: 24px;
  font-weight: 700;
  color: var(--vermilion);
}

/* ============ Quick Questions ============ */
.questions {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
}

.questions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.question-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.3s var(--ease);
  text-align: left;
  line-height: 1.6;
  position: relative;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.question-card::after {
  content: '→';
  position: absolute;
  right: var(--space-xl);
  top: 50%;
  transform: translateY(-50%) translateX(-8px);
  opacity: 0;
  transition: all 0.3s var(--ease);
  font-size: 18px;
  color: var(--vermilion);
}

.question-card:hover::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.question-card:hover {
  background: var(--paper-warm);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

[data-theme="dark"] .question-card:hover {
  background: var(--bg-elevated);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.question-card .q-num {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-faint);
  min-width: 24px;
  padding-top: 2px;
}

.question-card:hover .q-num {
  color: var(--vermilion);
}

.question-card .q-text {
  flex: 1;
  padding-right: var(--space-xl);
}

/* ============ Philosophy Strip ============ */
.philosophy {
  position: relative;
  z-index: 1;
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-3xl) var(--space-lg);
  overflow: hidden;
}

[data-theme="dark"] .philosophy {
  background: var(--paper);
  color: var(--ink);
}

.philosophy-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2px 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.philosophy-divider {
  width: 2px;
  height: 100%;
  min-height: 200px;
  background: linear-gradient(to bottom, transparent, rgba(196, 30, 58, 0.5), transparent);
}

[data-theme="dark"] .philosophy-divider {
  background: linear-gradient(to bottom, transparent, rgba(196, 30, 58, 0.3), transparent);
}

.philosophy-left .phil-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--vermilion-light);
  margin-bottom: var(--space-lg);
}

.philosophy-left blockquote {
  font-family: var(--font-serif-cn);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 1px;
}

.philosophy-left cite {
  display: block;
  margin-top: var(--space-lg);
  font-family: var(--font-body);
  font-size: 13px;
  font-style: normal;
  color: var(--ink-muted);
}

[data-theme="dark"] .philosophy-left cite {
  color: var(--ink-faint);
}

.philosophy-right {
  padding-left: var(--space-2xl);
}

.philosophy-right .phil-point {
  margin-bottom: var(--space-xl);
}

.philosophy-right .phil-point:last-child {
  margin-bottom: 0;
}

.phil-point-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 900;
  color: var(--vermilion);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.phil-point h4 {
  font-family: var(--font-serif-cn);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.phil-point p {
  font-size: 13px;
  line-height: 1.6;
  opacity: 0.7;
}

/* ============ Footer ============ */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-strong);
  padding: var(--space-xl) var(--space-lg);
  background: var(--bg-surface);
}

[data-theme="dark"] .footer {
  background: var(--bg-surface);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.footer-sep {
  width: 4px;
  height: 4px;
  background: var(--vermilion);
  border-radius: 50%;
}

.footer-copy {
  font-size: 13px;
  color: var(--ink-faint);
}

.footer-right {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ============ Chat Section ============ */
.chat-section {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--bg);
  display: none;
  flex-direction: column;
}

.chat-section.active {
  display: flex;
}

.chat-header {
  height: var(--nav-height);
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-strong);
  flex-shrink: 0;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 0;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  font-family: var(--font-body);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.back-btn:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

[data-theme="dark"] .back-btn:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

.chat-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif-cn);
  font-weight: 600;
  font-size: 16px;
}

.chat-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--vermilion);
  animation: dotPulse 2s ease-in-out infinite;
}

/* Chat Header Actions (new chat + status) */
.chat-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 0;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  font-family: var(--font-body);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.new-chat-btn:hover {
  background: var(--vermilion);
  color: white;
  border-color: var(--vermilion);
}

[data-theme="dark"] .new-chat-btn:hover {
  background: var(--vermilion-light);
  border-color: var(--vermilion-light);
}

/* KB Explore Modal */
.kb-explore-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.kb-explore-overlay.active {
  opacity: 1;
  visibility: visible;
}

.kb-explore-modal {
  width: 90%;
  max-width: 640px;
  max-height: 80vh;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.kb-explore-header {
  padding: 20px 24px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.kb-explore-header h3 {
  font-family: var(--font-serif-cn);
  font-size: 18px;
  font-weight: 700;
}

.kb-explore-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

/* KB Explore Toolbar & Search */
.kb-explore-toolbar {
  padding: 12px 24px 0;
  flex-shrink: 0;
}

.kb-explore-search {
  position: relative;
  display: flex;
  align-items: center;
}

.kb-explore-search-icon {
  position: absolute;
  left: 10px;
  color: var(--text-secondary);
  pointer-events: none;
  flex-shrink: 0;
}

.kb-explore-search input {
  width: 100%;
  padding: 8px 32px 8px 32px;
  border: 1px solid var(--border-strong);
  background: var(--bg-base);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-body);
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.kb-explore-search input:focus {
  border-color: var(--vermilion);
}

.kb-explore-search input::placeholder {
  color: var(--text-tertiary);
}

.kb-explore-search-clear {
  position: absolute;
  right: 6px;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.15s;
}

.kb-explore-search-clear:hover {
  background: var(--vermilion-glow);
}

/* KB Explore Category Tabs */
.kb-explore-tabs {
  display: flex;
  flex-shrink: 0;
  gap: 6px;
  padding: 12px 24px 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.kb-explore-tabs::-webkit-scrollbar {
  display: none;
}

.kb-explore-tab {
  flex-shrink: 0;
  padding: 5px 12px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.kb-explore-tab:hover {
  border-color: var(--vermilion);
  color: var(--vermilion);
}

.kb-explore-tab.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

[data-theme="dark"] .kb-explore-tab.active {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

.kb-tab-count {
  font-size: 10px;
  opacity: 0.6;
  font-variant-numeric: tabular-nums;
}

/* KB Explore Count */
.kb-explore-count {
  padding: 8px 24px 0;
  flex-shrink: 0;
  font-size: 12px;
  color: var(--text-tertiary);
}

/* KB Explore List */
.kb-explore-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 8px 0;
}

.kb-explore-item {
  padding: 10px 24px;
  cursor: pointer;
  transition: background 0.2s;
  border-bottom: 1px solid var(--border);
}

.kb-explore-item:hover {
  background: var(--vermilion-glow);
}

.kb-explore-item-title {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 3px;
}

.kb-explore-item-meta {
  font-size: 11px;
  color: var(--text-secondary);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.kb-explore-item-preview {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 4px;
  line-height: 1.5;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}

.kb-explore-item:hover .kb-explore-item-preview {
  max-height: 60px;
  opacity: 1;
}

.kb-explore-tag {
  display: inline-block;
  padding: 1px 6px;
  background: var(--vermilion-glow);
  color: var(--vermilion);
  font-size: 10px;
  border-radius: 2px;
}

.kb-explore-empty {
  padding: 40px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

.kb-explore-loading {
  padding: 40px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* Explore button in chat empty state */
.kb-explore-trigger {
  margin-top: 16px;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
}

.kb-explore-trigger:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

[data-theme="dark"] .kb-explore-trigger:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

#smartChatWrap {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

#searchModal {
  --snippet-font-family: var(--font-body);
}

/* ============ Scroll Reveal ============ */
.reveal {
  opacity: 1;
  transform: translateY(0);
}

.reveal.animate-in {
  animation: revealUp 0.7s var(--ease-out) both;
}

@keyframes revealUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal-delay-1 { animation-delay: 0.1s; }
.reveal-delay-2 { animation-delay: 0.2s; }
.reveal-delay-3 { animation-delay: 0.3s; }
.reveal-delay-4 { animation-delay: 0.4s; }
.reveal-delay-5 { animation-delay: 0.5s; }
.reveal-delay-6 { animation-delay: 0.6s; }

/* ============ Scrollbar ============ */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ink-faint);
}

/* ============ Hero Stagger Animation ============ */
.hero-eyebrow { animation: revealUp 0.6s var(--ease-out) 0.1s both; }
.hero-title { animation: revealUp 0.6s var(--ease-out) 0.2s both; }
.hero-desc { animation: revealUp 0.6s var(--ease-out) 0.3s both; }
.hero-stats { animation: revealUp 0.6s var(--ease-out) 0.4s both; }
.hero-actions { animation: revealUp 0.6s var(--ease-out) 0.5s both; }

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .modules-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .module-card.featured {
    grid-column: span 2;
    grid-template-columns: 1fr 1fr;
  }

  .hero-deco {
    font-size: 200px;
    right: -30px;
  }
}

@media (max-width: 768px) {
  .hero {
    padding-top: calc(var(--nav-height) + var(--space-xl));
    min-height: auto;
  }

  .hero-deco {
    display: none;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: var(--space-lg);
  }

  .stat {
    padding: 0 var(--space-lg);
  }

  .stat::after {
    display: none;
  }

  .modules-grid {
    grid-template-columns: 1fr;
  }

  .module-card.featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }

  .module-card.featured .module-visual {
    display: none;
  }

  .questions-grid {
    grid-template-columns: 1fr;
  }

  .philosophy-inner {
    grid-template-columns: 1fr;
  }

  .philosophy-divider {
    display: none;
  }

  .philosophy-right {
    padding-left: 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--space-xl);
  }

  [data-theme="dark"] .philosophy-right {
    border-top-color: rgba(245, 243, 238, 0.1);
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}

/* ============ Inline Search Section ============ */
.inline-search-section {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.inline-search-wrap {
  margin-top: var(--space-lg);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
  transition: all 0.3s var(--ease);
}

.inline-search-wrap:focus-within {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 4px var(--vermilion-glow), 0 4px 20px rgba(196, 30, 58, 0.1);
}

.inline-search-wrap search-bar-snippet {
  --search-bg: transparent;
  --search-border: none;
  --search-radius: 0;
  --search-snippet-primary-color: var(--vermilion) !important;
  --search-snippet-primary-hover: var(--vermilion-light) !important;
  --search-button-bg: var(--vermilion) !important;
  --search-button-hover-bg: var(--vermilion-light) !important;
  --button-bg: var(--vermilion) !important;
  --button-hover-bg: var(--vermilion-light) !important;
  width: 100%;
}

/* ============ MCP Section ============ */
.mcp-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-2xl);
}

.mcp-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.mcp-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: var(--space-lg);
  transition: all 0.3s var(--ease);
  position: relative;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.mcp-card:hover {
  border-color: var(--vermilion);
  box-shadow: 0 8px 32px rgba(196,30,58,0.1);
  transform: translateY(-4px);
}

.mcp-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--vermilion-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--vermilion);
  margin-bottom: var(--space-md);
  transition: all 0.3s var(--ease);
}

.mcp-card:hover .mcp-icon {
  background: var(--vermilion);
  color: white;
}

.mcp-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.mcp-card p {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.mcp-endpoint-row {
  display: flex !important;
  align-items: stretch;
  gap: 8px;
  width: 100%;
  min-width: 0;
}

.mcp-endpoint {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  width: 0;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 11.5px;
  line-height: 1.4;
  padding: 9px 11px;
  background: rgba(196,30,58,.07);
  border: 1px solid rgba(196,30,58,.16);
  border-radius: 8px;
  color: var(--vermilion);
  font-family: 'SF Mono', 'Fira Code', monospace;
  user-select: all;
}

.mcp-copy-btn {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  gap: 5px;
  flex: 0 0 auto;
  align-self: stretch;
  min-width: 66px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 8px;
  padding: 0 10px;
  background: #0c0c0d;
  color: rgba(255,255,255,.82);
  font: inherit;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.05);
  transition: background .2s, border-color .2s, color .2s, transform .15s, box-shadow .2s;
}

.mcp-copy-btn svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.mcp-copy-btn:hover { background: var(--vermilion); border-color: var(--vermilion); color: #fff; transform: translateY(-1px); box-shadow: 0 5px 14px rgba(196,30,58,.22); }
.mcp-copy-btn:active { transform: translateY(0); }
.mcp-copy-btn:focus-visible { outline: 2px solid var(--vermilion); outline-offset: 2px; }
.mcp-copy-btn.is-copied { background: var(--vermilion); border-color: var(--vermilion); color: #fff; }
.mcp-copy-btn.copy-failed { border-color: #b3261e; color: #ff7b73; }

@media (max-width: 480px) {
  .logo { gap: 8px !important; }
  .logo-mark { width: 30px !important; height: 30px !important; }
  .logo-mark .circle { width: 30px !important; height: 30px !important; }
  .logo-sub { display: none !important; } /* Hide sub-logo on narrow screens to prevent wrap */
  .nav-actions { gap: 6px !important; }
  .nav-btn { width: 34px !important; height: 34px !important; }
  .mcp-endpoint-row { gap: 6px; }
  .mcp-copy-btn { min-width: 40px; width: 40px; padding: 0; }
  .mcp-copy-btn [data-copy-label] { display: none; }
  .mcp-copy-btn svg { width: 15px; height: 15px; }
}

/* ============ Chat Bubble Overrides ============ */
chat-bubble-snippet {
  --search-snippet-primary-color: var(--vermilion);
  --chat-bubble-button-icon-color: white;
  z-index: 9999;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Global: all Cloudflare search snippet buttons → vermilion */
search-bar-snippet,
search-modal-snippet {
  --search-snippet-primary-color: var(--vermilion) !important;
  --search-snippet-primary-hover: var(--vermilion-light) !important;
}

chat-bubble-snippet.bubble-hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.5);
}

/* ============ Dark mode for new sections ============ */
[data-theme="dark"] .inline-search-wrap {
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

[data-theme="dark"] .mcp-card {
  border-color: rgba(255,255,255,0.06);
}

[data-theme="dark"] .mcp-card:hover {
  box-shadow: 0 4px 20px rgba(196,30,58,0.15);
}

[data-theme="dark"] .mcp-icon {
  background: rgba(196,30,58,0.15);
}

[data-theme="dark"] .mcp-endpoint {
  background: rgba(196,30,58,0.08);
  border-color: rgba(196,30,58,0.2);
}

@media (max-width: 768px) {
  .mcp-grid {
    grid-template-columns: 1fr;
  }
}

/* ============ Print ============ */
@media print {
  .navbar, .bg-animation, .hero-actions, .footer,
  chat-bubble-snippet, .inline-search-section, .mcp-section {
    display: none;
  }
}

/* ============ Back to Top ============ */
.back-to-top {
  position: fixed;
  bottom: 90px;
  right: 28px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--vermilion);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s var(--ease);
  z-index: 90;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--vermilion);
  color: #fff;
  border-color: var(--vermilion);
  box-shadow: 0 4px 16px rgba(196,30,58,0.25);
  transform: translateY(-2px);
}

/* ============ Module Card Active ============ */
.module-card.active {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 1px var(--vermilion), 0 4px 20px rgba(196,30,58,0.1);
}

/* ============ Keyboard Hint ============ */
.keyboard-hint {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 8px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  color: var(--text-secondary);
  z-index: 80;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.keyboard-hint.show {
  opacity: 1;
}

/* ============ Smart Chat — Agentic RAG ============ */
.smart-chat-wrap {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.smart-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  scroll-behavior: smooth;
}

/* Empty state */
.smart-chat-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--text-secondary);
}

.smart-chat-empty .empty-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--vermilion-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--vermilion);
}

.smart-chat-empty h3 {
  font-family: var(--font-serif-cn);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--text);
}

.smart-chat-empty p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 320px;
  line-height: 1.6;
}

.empty-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  max-width: 480px;
}

.empty-chip {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text);
  font-size: 13px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.25s var(--ease);
}

.empty-chip:hover {
  border-color: var(--vermilion);
  color: var(--vermilion);
  background: var(--vermilion-glow);
}

/* Conversation Starters Grid */
.empty-starter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  max-width: 520px;
  margin-top: 8px;
}

.starter-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-strong, rgba(0,0,0,0.08));
  background: var(--bg-surface, #f5f5f5);
  cursor: pointer;
  transition: all 0.25s var(--ease, ease);
  text-align: left;
  font-family: var(--font-body);
}

.starter-card:hover {
  border-color: var(--vermilion, #C41E3A);
  background: var(--vermilion-glow, rgba(196,30,58,0.05));
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(196,30,58,0.08);
}

.starter-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(196,30,58,0.06);
}
.starter-icon svg {
  width: 18px;
  height: 18px;
  stroke: var(--vermilion, #C41E3A);
  stroke-width: 1.5;
  fill: none;
}

.starter-text {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text, #1a1a1a);
  line-height: 1.3;
}

.starter-hint {
  display: block;
  font-size: 11.5px;
  color: var(--text-3, #999);
  margin-top: 2px;
  line-height: 1.2;
}

/* Message bubbles */
.smart-msg {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  max-width: 800px;
  animation: msgFadeIn 0.3s var(--ease) forwards;
}

.smart-msg-user {
  flex-direction: row-reverse;
  margin-left: auto;
}

.smart-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.smart-msg-assistant .smart-msg-avatar {
  background: var(--vermilion-glow);
  color: var(--vermilion);
}

.smart-msg-user .smart-msg-avatar {
  background: var(--ink);
  color: var(--paper);
}

[data-theme="dark"] .smart-msg-user .smart-msg-avatar {
  background: var(--paper);
  color: var(--ink);
}

.smart-msg-body {
  max-width: 640px;
}

.smart-msg-text {
  padding: var(--space-md) var(--space-md);
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  font-family: var(--font-body);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.smart-msg-user .smart-msg-text {
  background: var(--vermilion);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.smart-msg-assistant .smart-msg-text {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
  color: var(--text);
}

[data-theme="dark"] .smart-msg-assistant .smart-msg-text {
  background: var(--bg-elevated);
  border-color: rgba(255,255,255,0.06);
}

/* Markdown content inside assistant messages */
.smart-msg-assistant .smart-msg-text h2,
.smart-msg-assistant .smart-msg-text h3,
.smart-msg-assistant .smart-msg-text h4 {
  font-family: var(--font-serif-cn);
  font-weight: 700;
  margin: var(--space-md) 0 var(--space-sm);
  color: var(--text);
}

.smart-msg-assistant .smart-msg-text h2 { font-size: 18px; }
.smart-msg-assistant .smart-msg-text h3 { font-size: 16px; }
.smart-msg-assistant .smart-msg-text h4 { font-size: 15px; }

.smart-msg-assistant .smart-msg-text p {
  margin: 0 0 var(--space-sm);
}

.smart-msg-assistant .smart-msg-text strong {
  color: var(--vermilion);
  font-weight: 600;
}

.smart-msg-assistant .smart-msg-text ul,
.smart-msg-assistant .smart-msg-text ol {
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
}

.smart-msg-assistant .smart-msg-text li {
  margin-bottom: var(--space-xs);
  line-height: 1.7;
}

.smart-msg-assistant .smart-msg-text blockquote {
  border-left: 3px solid var(--vermilion);
  padding: var(--space-sm) var(--space-md);
  margin: var(--space-sm) 0;
  background: var(--vermilion-glow);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-secondary);
}

.smart-msg-assistant .smart-msg-text pre {
  background: var(--ink);
  color: #E8E6E1;
  padding: var(--space-md);
  border-radius: 8px;
  overflow-x: auto;
  margin: var(--space-sm) 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
}

.smart-msg-assistant .smart-msg-text code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--vermilion-glow);
  color: var(--vermilion);
}

.smart-msg-assistant .smart-msg-text pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.smart-msg-assistant .smart-msg-text hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-md) 0;
}

/* Markdown Table */
.smart-md-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-sm) 0;
  font-size: 13px;
}

.smart-md-table th,
.smart-md-table td {
  padding: 6px 10px;
  border: 1px solid var(--border);
  text-align: left;
}

.smart-md-table th {
  background: var(--ink-surface);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.smart-md-table tr:hover td {
  background: var(--ink-hover);
}

[data-theme="dark"] .smart-md-table th {
  background: #1E1E1E;
}

[data-theme="dark"] .smart-md-table tr:hover td {
  background: #1A1A1A;
}

/* Sources Panel */
.smart-msg-sources {
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border);
}

.sources-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ink-faint);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.sources-title::-webkit-details-marker {
  display: none;
}

.sources-title::after {
  content: '+';
  font-size: 16px;
  line-height: 1;
  color: var(--text-secondary);
}

.smart-msg-sources[open] > .sources-title::after {
  content: '−';
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.source-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.source-card:hover {
  border-color: var(--primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.source-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.source-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  font-size: 10px;
  font-weight: 700;
  flex-shrink: 0;
}

.source-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-score {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.score-bar {
  width: 40px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.score-fill {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 2px;
  transition: width 0.3s;
}

.score-num {
  font-size: 10px;
  color: var(--ink-faint);
  font-family: 'Inter', monospace;
}

.source-snippet {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 6px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.source-item {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 2px 0;
}

.source-item::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--vermilion);
  margin-right: 6px;
  vertical-align: middle;
}

/* Inline Citation Links */
.citation {
  color: var(--primary);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.75em;
  vertical-align: super;
  transition: all 0.15s;
  padding: 0 1px;
  border-radius: 3px;
}

.citation:hover {
  background: var(--primary);
  color: white;
}

/* Confidence Indicator */
.smart-confidence {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-sm);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
}

.smart-confidence-high {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.smart-confidence-medium {
  background: rgba(234, 179, 8, 0.1);
  color: #a16207;
  border: 1px solid rgba(234, 179, 8, 0.2);
}

.smart-confidence-low {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.smart-confidence::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.smart-confidence-high::before { background: #16a34a; }
.smart-confidence-medium::before { background: #a16207; }
.smart-confidence-low::before { background: #dc2626; }

/* Action Buttons (regenerate, feedback) */
.smart-msg-actions {
  display: flex;
  gap: 4px;
  margin-top: var(--space-sm);
  opacity: 0;
  transition: opacity 0.2s;
}

.smart-msg:hover .smart-msg-actions {
  opacity: 1;
}

.smart-action-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 4px;
}

.smart-action-btn:hover {
  background: var(--ink-hover);
  border-color: var(--primary);
  color: var(--primary);
}

.smart-action-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.smart-action-btn svg {
  width: 14px;
  height: 14px;
}

/* Loading animation */
.smart-loading-msg {
  pointer-events: none;
}

.smart-loading-content {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.loading-dots {
  display: flex;
  gap: 4px;
}

.loading-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--vermilion);
  animation: loadingBounce 1.2s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

.loading-text {
  font-size: 13px;
  color: var(--text-secondary);
  font-style: italic;
}

/* Input area */
.smart-chat-input-area {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.smart-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  padding: var(--space-sm) var(--space-sm) var(--space-sm) var(--space-md);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.smart-input-wrap:focus-within {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 3px var(--vermilion-glow);
}

.smart-input-wrap textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  color: var(--text);
  font-size: 14.5px;
  font-family: var(--font-body);
  line-height: 1.5;
  padding: 6px 0;
  max-height: 120px;
  min-height: 24px;
}

.smart-input-wrap textarea::placeholder {
  color: var(--ink-faint);
}

.smart-send-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--vermilion);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.25s var(--ease);
}

.smart-send-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.smart-send-btn:not(:disabled):hover {
  background: var(--vermilion-light);
  transform: scale(1.08);
}

.smart-input-hint {
  text-align: center;
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: var(--space-sm);
  letter-spacing: 0.5px;
}

/* Follow-up suggestions */
.smart-followup-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0 0 var(--space-md);
  padding-left: 44px;
}

.smart-followup-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: 20px;
  border: 1px solid rgba(196,30,58,0.25);
  background: rgba(196,30,58,0.06);
  color: var(--vermilion);
  font-size: 13px;
  font-family: var(--font-body);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.25s var(--ease);
  opacity: 0;
  transform: translateY(6px);
  animation: chipFadeIn 0.3s ease forwards;
}

.smart-followup-chip:hover {
  background: rgba(196,30,58,0.12);
  border-color: rgba(196,30,58,0.45);
}

/* Animations */
@keyframes msgFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes chipFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes loadingBounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.3; }
  40% { transform: scale(1); opacity: 1; }
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ============ Message Toolbar ============ */
.smart-msg {
  position: relative;
}

.smart-msg-toolbar {
  display: flex;
  gap: 4px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity 0.2s;
}

.smart-msg:hover .smart-msg-toolbar {
  opacity: 1;
}

.smart-msg-user .smart-msg-toolbar {
  justify-content: flex-end;
}

.toolbar-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-muted, #888);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}

.toolbar-btn:hover {
  background: var(--bg-surface, #f5f5f5);
  color: var(--text, #333);
}

[data-theme="dark"] .toolbar-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--paper);
}

.toolbar-btn.active {
  color: var(--vermilion, #C41E3A);
}

.toolbar-btn svg {
  width: 16px;
  height: 16px;
}

.toolbar-sep {
  width: 1px;
  height: 16px;
  background: var(--border, #e5e5e5);
  margin: 6px 4px;
  align-self: center;
}

.toolbar-btn.feedback-btn {
  font-size: 18px;
  width: 36px;
  height: 34px;
}

.toolbar-btn.feedback-btn.active {
  background: var(--vermilion-bg, rgba(196, 30, 58, 0.1));
}

[data-theme="dark"] .toolbar-sep {
  background: rgba(255,255,255,0.08);
}

/* Share Modal */
.share-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  animation: fadeIn 0.2s ease;
}

.share-modal {
  background: var(--bg, #fff);
  border-radius: 16px;
  padding: 28px;
  width: 420px;
  max-width: 92vw;
  box-shadow: 0 24px 48px rgba(0,0,0,0.15);
  animation: modalSlideIn 0.25s ease;
}

.share-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.share-modal-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text, #1a1a1a);
  margin: 0;
}

.share-modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-3, #999);
  padding: 0 4px;
  line-height: 1;
}

.share-modal-close:hover { color: var(--text, #1a1a1a); }

.share-modal-desc {
  font-size: 13px;
  color: var(--text-2, #666);
  margin: 0 0 16px 0;
  line-height: 1.5;
}

.share-modal-url-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.share-modal-url {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-strong, rgba(0,0,0,0.1));
  border-radius: 8px;
  font-size: 13px;
  font-family: var(--font-mono, monospace);
  background: var(--bg-surface, #f5f5f5);
  color: var(--text, #1a1a1a);
  outline: none;
}

.share-modal-copy {
  padding: 10px 18px;
  background: var(--vermilion, #C41E3A);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.share-modal-copy:hover { background: var(--vermilion-hover, #E8354F); }

.share-modal-actions {
  display: flex;
  gap: 8px;
}

.share-action-btn {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-strong, rgba(0,0,0,0.1));
  border-radius: 8px;
  font-size: 13px;
  font-family: var(--font-body);
  background: var(--bg-surface, #f5f5f5);
  color: var(--text, #1a1a1a);
  cursor: pointer;
  transition: all 0.2s;
}

.share-action-btn:hover {
  border-color: var(--vermilion, #C41E3A);
  color: var(--vermilion, #C41E3A);
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(12px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Toast notification */
.smart-toast {
  position: fixed;
  top: 76px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink, #0C0C0C);
  color: var(--paper, #F5F3EE);
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-family: var(--font-body);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 9999;
  pointer-events: none;
}

[data-theme="dark"] .smart-toast {
  background: var(--paper, #F5F3EE);
  color: var(--ink, #0C0C0C);
}

.smart-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============ Streaming Status ============ */
.smart-stream-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  margin-top: 8px;
  border-radius: 8px;
  background: var(--bg-surface, #f8f8f8);
  border: 1px solid var(--border, #e8e8e8);
  font-size: 12.5px;
  color: var(--text-muted, #888);
  font-family: var(--font-body);
  transition: all 0.3s ease;
}

[data-theme="dark"] .smart-stream-status {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.06);
}

.smart-stream-status .status-icon {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--vermilion, #C41E3A);
  flex-shrink: 0;
  animation: dotPulse 1.5s ease-in-out infinite;
}

.smart-stream-status.done .status-icon {
  background: #22c55e;
  animation: none;
}

/* ============ Thinking Stages ============ */
.smart-thinking-stages {
  padding: 12px 16px;
  background: var(--bg-surface, #f8f8f8);
  border: 1px solid var(--border, #e8e8e8);
  border-radius: 10px;
  margin-top: 8px;
  transition: all 0.4s ease;
  overflow: hidden;
  max-height: 200px;
  opacity: 1;
}

[data-theme="dark"] .smart-thinking-stages {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.06);
}

.smart-thinking-stages.collapsed {
  max-height: 0;
  opacity: 0;
  padding: 0 16px;
  border: none;
  margin-top: 0;
}

.smart-thinking-stages.done {
  border-color: rgba(34, 197, 94, 0.3);
  background: rgba(34, 197, 94, 0.04);
}

.thinking-stage {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  font-size: 13px;
  color: var(--text-muted, #aaa);
  transition: all 0.3s ease;
}

.thinking-stage.active {
  color: var(--text, #333);
  font-weight: 500;
}

.thinking-stage.done {
  color: #22c55e;
}

[data-theme="dark"] .thinking-stage.active {
  color: var(--paper, #F5F3EE);
}

.thinking-stage-icon {
  width: 18px;
  text-align: center;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.thinking-stage-icon svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
}

/* Typing Cursor */
.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--vermilion, #C41E3A);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* ============ Edit Button (User Message) ============ */
.smart-msg-user .smart-msg-body {
  position: relative;
}

.smart-edit-btn {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: none;
  background: var(--bg-surface, #f0f0f0);
  color: var(--text-muted, #888);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.15s;
  z-index: 2;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

[data-theme="dark"] .smart-edit-btn {
  background: rgba(255,255,255,0.1);
}

.smart-msg-user:hover .smart-edit-btn {
  opacity: 1;
}

.smart-edit-btn:hover {
  background: var(--vermilion, #C41E3A);
  color: #fff;
}

.smart-edit-btn svg {
  width: 13px;
  height: 13px;
}

/* Mobile responsive */
@media (max-width: 768px) {
  /* --- Mobile Header: icon-only mode --- */
  .chat-header {
    padding: 0 var(--space-sm);
    gap: 4px;
  }
  .back-btn {
    padding: 6px 8px;
    gap: 0;
  }
  .back-btn span {
    display: none;
  }
  .chat-title span {
    display: none;
  }
  .chat-title {
    font-size: 15px;
    gap: 4px;
  }
  .new-chat-btn {
    padding: 6px 8px;
    gap: 0;
  }
  .new-chat-btn span {
    display: none;
  }
  .chat-status span:not(.status-dot) {
    display: none;
  }
  .chat-status {
    gap: 0;
  }

  /* --- Mobile Chat Messages --- */
  .smart-chat-messages {
    padding: var(--space-md);
  }
  .smart-msg-text {
    max-width: calc(100vw - 80px);
    padding: 12px 14px;
    font-size: 14px;
  }

  /* --- Mobile Input Area --- */
  .smart-chat-input-area {
    padding: var(--space-sm) var(--space-sm);
  }
  .smart-input-wrap {
    padding: 6px 6px 6px 10px;
  }
  .smart-input-wrap textarea {
    font-size: 13.5px;
    padding: 4px 0;
  }

  /* --- Mobile Bottom: Deep Research + hint side by side --- */
  .smart-input-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 6px;
    width: 100%;
    box-sizing: border-box;
    padding: 0 2px;
  }
  .smart-input-hint {
    font-size: 10px;
    margin-top: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* --- Mobile Empty State --- */
  .empty-suggestions {
    flex-direction: column;
    align-items: center;
  }
  .empty-starter-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
  }
  .smart-followup-wrap {
    padding-left: 0;
    justify-content: center;
  }
}

/* ============ BATCH 2: Deep Research Toggle ============ */
.deep-research-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border: 1.5px solid var(--border, #e8e8e8);
  border-radius: 20px;
  background: transparent;
  color: var(--text-muted, #888);
  font-size: 12px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
  user-select: none;
}

.deep-research-toggle:hover {
  border-color: var(--primary, #C41E3A);
  color: var(--primary, #C41E3A);
  background: rgba(196, 30, 58, 0.04);
}

.deep-research-toggle.active {
  border-color: var(--primary, #C41E3A);
  background: var(--primary, #C41E3A);
  color: #fff;
  box-shadow: 0 1px 4px rgba(196, 30, 58, 0.25);
}

.deep-research-toggle svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

.deep-research-toggle span {
  font-weight: 500;
}

/* ============ BATCH 2: Deep Research Badge ============ */
.deep-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 8px;
  padding: 5px 12px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(196, 30, 58, 0.08), rgba(196, 30, 58, 0.03));
  border: 1px solid rgba(196, 30, 58, 0.15);
  color: var(--primary, #C41E3A);
  font-size: 11.5px;
  font-weight: 500;
  font-family: var(--font-body);
}

.deep-badge-icon {
  display: flex;
  align-items: center;
}
.deep-badge-icon svg {
  width: 14px;
  height: 14px;
}

[data-theme="dark"] .deep-badge {
  background: linear-gradient(135deg, rgba(232, 53, 79, 0.12), rgba(232, 53, 79, 0.04));
  border-color: rgba(232, 53, 79, 0.2);
  color: #E8354F;
}

/* ============ BATCH 2: Lead Capture (In-Chat Prompt) ============ */
.lead-prompt {
  padding: 0 var(--space-lg);
  margin: 4px 0;
}

.lead-prompt-inner {
  position: relative;
  padding: 16px 20px;
  border-radius: 12px;
  background: var(--bg-surface, #f8f8f8);
  border: 1px solid var(--border, #e8e8e8);
}

[data-theme="dark"] .lead-prompt-inner {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.06);
}

.lead-prompt-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-muted, #aaa);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 2px;
}

.lead-prompt-close:hover {
  color: var(--text, #333);
}

.lead-prompt-text {
  margin: 0 0 10px;
  font-size: 13.5px;
  color: var(--text, #333);
  font-family: var(--font-body);
}

.lead-prompt-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.lead-prompt-email,
.lead-prompt-name {
  flex: 1;
  min-width: 120px;
  padding: 8px 12px;
  border: 1px solid var(--border, #e8e8e8);
  border-radius: 8px;
  font-size: 13px;
  font-family: var(--font-body);
  background: var(--bg, #fff);
  color: var(--text, #333);
  outline: none;
  transition: border-color 0.2s;
}

.lead-prompt-email:focus,
.lead-prompt-name:focus {
  border-color: var(--primary, #C41E3A);
}

.lead-prompt-submit {
  padding: 8px 18px;
  border: none;
  border-radius: 8px;
  background: var(--primary, #C41E3A);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background 0.2s;
}

.lead-prompt-submit:hover {
  background: var(--primary-hover, #E8354F);
}

.lead-prompt-success {
  margin: 0;
  font-size: 14px;
  color: #22c55e;
  font-weight: 500;
  font-family: var(--font-body);
  text-align: center;
  padding: 4px 0;
}

/* ============ BATCH 2: Lead Section (Homepage) ============ */
.lead-section {
  padding: 64px 0;
  background: var(--bg-surface, #f8f8f8);
  border-top: 1px solid var(--border, #e8e8e8);
}

[data-theme="dark"] .lead-section {
  background: rgba(255,255,255,0.02);
  border-top-color: rgba(255,255,255,0.06);
}

.lead-section-inner {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  text-align: center;
}

.lead-section-text {
  margin-bottom: 24px;
}

.lead-section-text .label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary, #C41E3A);
  margin-bottom: 8px;
}

.lead-section-text h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text, #111);
  margin: 0 0 8px;
  font-family: var(--font-heading);
}

.lead-section-text p {
  font-size: 14px;
  color: var(--text-muted, #666);
  margin: 0;
  font-family: var(--font-body);
}

.lead-form {
  width: 100%;
}

.lead-form-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.lead-form-row input[type="email"],
.lead-form-row input[type="text"] {
  flex: 1;
  min-width: 140px;
  padding: 10px 14px;
  border: 1px solid var(--border, #e8e8e8);
  border-radius: 8px;
  font-size: 14px;
  font-family: var(--font-body);
  background: var(--bg, #fff);
  color: var(--text, #333);
  outline: none;
  transition: border-color 0.2s;
}

.lead-form-row input:focus {
  border-color: var(--primary, #C41E3A);
}

.lead-form-row .btn-primary {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  background: var(--primary, #C41E3A);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.2s;
  white-space: nowrap;
}

.lead-form-row .btn-primary:hover {
  background: var(--primary-hover, #E8354F);
}

.lead-form-row .btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.lead-success {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px;
  font-size: 15px;
  font-weight: 500;
  color: #22c55e;
  font-family: var(--font-body);
}

/* ============ BATCH 2: Mobile Responsive Additions ============ */
@media (max-width: 768px) {
  .deep-research-toggle {
    padding: 4px 10px;
    font-size: 11px;
  }

  .deep-research-toggle span {
    display: none;
  }

  .lead-prompt-form {
    flex-direction: column;
  }

  .lead-prompt-email,
  .lead-prompt-name {
    min-width: auto;
  }

  .lead-form-row {
    flex-direction: column;
  }

  .lead-form-row input[type="email"],
  .lead-form-row input[type="text"] {
    min-width: auto;
  }

  .lead-form-row .btn-primary {
    width: 100%;
    justify-content: center;
  }
}

/* ============ BATCH 3: Toolbar Button Upgrades ============ */
.smart-msg-toolbar {
  gap: 4px;
  margin-top: 8px;
}

.toolbar-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.toolbar-btn svg {
  width: 16px;
  height: 16px;
}

.toolbar-btn.feedback-btn {
  width: 36px;
  height: 34px;
}

.toolbar-btn.feedback-btn.active {
  background: var(--vermilion-bg, rgba(196,30,58,0.1));
}

/* ============ BATCH 3: Empty State SVG Enhancement ============ */
.smart-chat-empty .empty-icon svg {
  width: 36px;
  height: 36px;
}

.smart-chat-empty .empty-icon {
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.smart-chat-empty .empty-icon:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 32px rgba(196,30,58,0.15);
}

/* ============ BATCH 3: Scroll Entrance Animations ============ */
.module-card {
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.question-card {
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

/* ============ BATCH 3: Mobile Responsive Improvements ============ */
@media (max-width: 768px) {
  .smart-msg-toolbar {
    gap: 2px;
    margin-top: 6px;
  }

  .toolbar-btn {
    width: 30px;
    height: 30px;
  }

  .toolbar-btn svg {
    width: 14px;
    height: 14px;
  }

  .toolbar-btn.feedback-btn {
    width: 32px;
    height: 30px;
  }

  .smart-chat-empty .empty-icon {
    width: 56px;
    height: 56px;
  }

  .smart-chat-empty .empty-icon svg {
    width: 28px;
    height: 28px;
  }

  .smart-chat-empty h3 {
    font-size: 18px;
  }

  .smart-chat-messages {
    padding: var(--space-sm);
  }

  .smart-msg-content {
    padding: 12px 14px;
  }

  .deep-badge {
    font-size: 10.5px;
    padding: 4px 10px;
  }

  .deep-badge-icon svg {
    width: 12px;
    height: 12px;
  }

  .thinking-stage {
    font-size: 12px;
    gap: 6px;
  }

  .thinking-stage-icon svg {
    width: 14px;
    height: 14px;
  }
}

@media (max-width: 480px) {
  .module-card {
    padding: 14px;
  }

  .module-card .module-icon {
    width: 40px;
    height: 40px;
    min-width: 40px;
  }

  .module-card .module-title {
    font-size: 14px;
  }

  .module-card .module-desc {
    font-size: 12px;
  }

  .question-card {
    padding: 12px;
  }

  .question-card .q-text {
    font-size: 13px;
  }

  .stat {
    font-size: 28px;
  }

  .stat-icon svg {
    width: 16px;
    height: 16px;
  }
}


/* ============ FRONTEND EXPERIENCE V10 ============ */
.hero {
  min-height: calc(100svh - 1px);
  justify-content: flex-start;
  padding-top: calc(var(--nav-height) + 42px);
  padding-bottom: 42px;
}

.hero-content {
  max-width: 860px;
}

.hero-title {
  margin-bottom: 16px;
}

.hero-title .line-cn {
  font-size: clamp(48px, 6.5vw, 76px);
  letter-spacing: 0;
}

.hero-title .line-en {
  font-size: clamp(23px, 2.8vw, 34px);
  letter-spacing: 0;
}

.hero-desc {
  max-width: 680px;
  margin-bottom: 20px;
  font-size: 15.5px;
  line-height: 1.75;
}

.hero-ask {
  width: min(100%, 760px);
  padding: 16px;
  background: color-mix(in srgb, var(--bg-surface) 92%, transparent);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(27, 20, 18, 0.06);
}

.hero-ask-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.hero-ask-head > div:first-child {
  min-width: 0;
}

.hero-ask-label {
  display: block;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 3px;
}

.hero-ask-note {
  display: block;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.4;
}

.answer-mode-switch {
  display: inline-grid;
  grid-template-columns: repeat(2, auto);
  align-items: center;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  flex-shrink: 0;
}

.answer-mode-btn {
  min-height: 30px;
  padding: 0 12px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.answer-mode-btn.active {
  color: #fff;
  background: var(--vermilion);
}

.hero-ask-input {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 10px 10px 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.hero-ask-input:focus-within {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 3px var(--vermilion-glow);
}

.hero-ask-input textarea {
  flex: 1;
  min-height: 28px;
  max-height: 112px;
  padding: 4px 0;
  resize: none;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

.hero-ask-input textarea::placeholder {
  color: var(--ink-faint);
}

.hero-ask-input button {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 0;
  border-radius: 50%;
  background: var(--vermilion);
  color: #fff;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero-ask-input button:disabled {
  opacity: 0.3;
  cursor: default;
}

.hero-ask-input button:not(:disabled):hover {
  transform: scale(1.05);
}

.hero-question-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.hero-question-examples button {
  padding: 6px 10px;
  border: 0;
  border-bottom: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 12px;
  cursor: pointer;
}

.hero-question-examples button:hover {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

.hero-stats {
  width: min(100%, 760px);
  margin: 18px 0 14px;
  padding: 12px 0;
}

.stat {
  flex: 1;
  padding: 0 18px;
}

.stat:first-child {
  padding-left: 0;
}

.stat-number {
  font-size: 30px;
  letter-spacing: 0;
}

.stat-icon {
  display: none;
}

.hero-actions {
  gap: 10px;
}

.hero-actions .btn-primary,
.hero-actions .btn-secondary {
  padding: 11px 18px;
  font-size: 12px;
}

.empty-starter-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 720px;
}

.starter-card {
  border-radius: 8px;
}

.smart-chat-empty {
  padding-top: 28px;
  padding-bottom: 28px;
}

.smart-chat-empty .empty-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 14px;
}

.smart-chat-empty .empty-icon svg {
  width: 28px;
  height: 28px;
}

.smart-chat-empty p {
  margin-bottom: 16px;
}

.smart-chat-messages {
  padding-left: max(var(--space-lg), calc((100vw - 920px) / 2));
  padding-right: max(var(--space-lg), calc((100vw - 920px) / 2));
}

.smart-msg {
  max-width: 860px;
}

.smart-msg-assistant {
  margin-left: auto;
  margin-right: auto;
}

.smart-msg-body {
  width: 100%;
  max-width: 760px;
  min-width: 0;
}

.smart-msg-assistant .smart-msg-text {
  padding: 4px 0 8px;
  border: 0;
  background: transparent;
  border-radius: 0;
  font-size: 15px;
  line-height: 1.82;
}

[data-theme="dark"] .smart-msg-assistant .smart-msg-text {
  background: transparent;
  border: 0;
}

.smart-msg-assistant .smart-msg-text h2,
.smart-msg-assistant .smart-msg-text h3,
.smart-msg-assistant .smart-msg-text h4 {
  letter-spacing: 0;
}

.smart-msg-assistant .smart-msg-text h3 {
  margin-top: 24px;
  font-size: 18px;
}

.smart-msg-assistant .smart-msg-text h4 {
  margin-top: 20px;
  font-size: 16px;
}

.answer-summary-title {
  margin: 0 !important;
  padding: 0 0 6px;
  color: var(--vermilion) !important;
  font-family: var(--font-body) !important;
  font-size: 12px !important;
  font-weight: 700 !important;
  letter-spacing: 0 !important;
}

.answer-summary-title + p,
.answer-summary-title + br + p {
  margin: 0 0 20px !important;
  padding: 14px 16px;
  border-left: 3px solid var(--vermilion);
  background: var(--vermilion-glow);
  color: var(--text);
  font-size: 15.5px;
  font-weight: 600;
}

.smart-md-table-wrap {
  width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  margin: 10px 0;
}

.smart-md-table {
  min-width: 520px;
  margin: 0;
}

.smart-msg-sources {
  margin-top: 18px;
  padding-top: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.sources-title {
  min-height: 48px;
  margin: 0;
  padding: 0 14px;
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  background: var(--bg-surface);
}

.sources-title::after {
  margin-left: 8px;
}

.sources-summary-note {
  margin-left: auto;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 400;
}

.sources-list {
  gap: 0;
  padding: 0 12px 10px;
}

.source-card {
  padding: 12px 0;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
  cursor: default;
}

.source-card:last-child {
  border-bottom: 0;
}

.source-card:hover {
  border-color: var(--border);
  box-shadow: none;
}

.source-title {
  white-space: normal;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-height: 1.45;
  font-size: 13px;
}

.source-score {
  padding: 3px 7px;
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 10px;
  font-weight: 600;
}

.source-score-high {
  color: #18794e;
  background: rgba(24, 121, 78, 0.09);
}

.source-score-medium {
  color: #8a5a00;
  background: rgba(190, 125, 0, 0.1);
}

.source-snippet {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 7px 0 0 28px;
  line-height: 1.55;
  font-size: 11.5px;
}

.smart-chat-input-area {
  padding-bottom: max(var(--space-md), env(safe-area-inset-bottom));
}

.smart-input-wrap,
.smart-input-options {
  width: min(100%, 860px);
  margin-left: auto;
  margin-right: auto;
}

.smart-input-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
}

.chat-mode-switch {
  background: var(--bg-surface);
}

.smart-input-hint {
  margin-top: 0;
  text-align: right;
  letter-spacing: 0;
}

.smart-followup-wrap {
  width: min(100%, 804px);
  margin-left: auto;
  margin-right: auto;
  padding-left: 0;
  align-items: center;
}

.smart-followup-title {
  width: 100%;
  margin-bottom: 2px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
}

.smart-followup-chip {
  white-space: normal;
  text-align: left;
  border-radius: 6px;
}

@media (max-width: 768px) {
  .hero {
    min-height: calc(100svh - 1px);
    padding: calc(var(--nav-height) + 28px) 20px 28px;
  }

  .hero-eyebrow {
    margin-bottom: 18px;
  }

  .hero-title .line-cn {
    font-size: 42px;
    line-height: 1.12;
  }

  .hero-title .line-en {
    font-size: 22px;
  }

  .hero-desc {
    margin-bottom: 16px;
    font-size: 14px;
    line-height: 1.7;
  }

  .hero-ask {
    padding: 12px;
  }

  .hero-ask-head {
    align-items: flex-start;
    gap: 10px;
  }

  .hero-ask-note {
    max-width: 170px;
  }

  .answer-mode-btn {
    min-height: 28px;
    padding: 0 9px;
    font-size: 11px;
  }

  .hero-ask-input textarea {
    min-height: 50px;
    font-size: 14px;
  }

  .hero-question-examples {
    gap: 4px 10px;
  }

  .hero-question-examples button {
    padding: 5px 0;
    font-size: 11.5px;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    margin: 14px 0 12px;
    padding: 10px 0;
  }

  .hero-stats .stat:nth-child(n + 3) {
    display: none;
  }

  .stat {
    padding: 0 14px;
  }

  .stat-number {
    font-size: 28px;
  }

  .hero-actions {
    flex-wrap: nowrap;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    flex: 1;
    justify-content: center;
    padding: 11px 10px;
  }

  .empty-starter-grid {
    grid-template-columns: 1fr;
    width: 100%;
    max-width: 340px;
  }

  .smart-chat-empty {
    justify-content: flex-start;
    padding: 22px 12px;
  }

  .smart-chat-messages {
    padding: 14px 12px;
  }

  .smart-msg {
    gap: 8px;
  }

  .smart-msg-avatar {
    width: 28px;
    height: 28px;
  }

  .smart-msg-body,
  .smart-msg-text {
    max-width: calc(100vw - 64px);
  }

  .smart-msg-assistant .smart-msg-text {
    padding-top: 0;
    font-size: 14.5px;
    line-height: 1.78;
  }

  .smart-msg-assistant .smart-msg-text h3 {
    font-size: 17px;
  }

  .smart-msg-assistant .smart-msg-text h4 {
    font-size: 15.5px;
  }

  .smart-md-table-wrap {
    max-width: calc(100vw - 64px);
  }

  .sources-title {
    min-height: 44px;
    padding: 0 10px;
  }

  .sources-summary-note {
    display: none;
  }

  .source-card-header {
    align-items: flex-start;
  }

  .source-score {
    white-space: nowrap;
  }

  .source-snippet {
    margin-left: 28px;
  }

  .smart-chat-input-area {
    padding: 8px 8px max(8px, env(safe-area-inset-bottom));
  }

  .smart-input-options {
    gap: 8px;
  }

  .smart-input-hint {
    max-width: 145px;
    font-size: 10px;
    white-space: normal;
    line-height: 1.3;
  }

  .smart-msg-toolbar {
    opacity: 1;
  }

  .smart-followup-wrap {
    justify-content: flex-start;
    padding: 0 0 12px 36px;
  }

  .smart-followup-chip {
    width: 100%;
  }
}


/* ============ FRONTEND EXPERIENCE V12 ============ */
/* Center the existing home experience without changing its content or behavior. */
.hero {
  width: 100%;
  max-width: none;
  min-height: min(100svh, 840px);
  overflow: clip;
  padding: calc(var(--nav-height) + clamp(28px, 5vh, 56px)) clamp(20px, 5vw, 80px) clamp(48px, 8vh, 88px);
}

.hero-content {
  width: min(100%, 1180px);
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-eyebrow {
  padding-left: 0;
  gap: 10px;
  margin-bottom: 18px;
}

.hero-eyebrow::before {
  position: static;
  width: 24px;
  height: 1px;
  transform: none;
}

.hero-title .line-cn {
  font-size: clamp(52px, 5.2vw, 72px);
}

.hero-title .line-en {
  font-size: clamp(22px, 2.2vw, 30px);
}

.hero-desc {
  max-width: 700px;
  margin: 0 auto 24px;
  font-size: 15px;
  line-height: 1.8;
}

.hero-ask {
  width: min(100%, 820px);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg-surface) 88%, transparent);
  box-shadow: 0 10px 28px rgba(27, 20, 18, 0.045);
  overflow: hidden;
}

.hero-ask-head {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
  padding: 12px 16px 0;
}

.hero-ask-head > div:first-child {
  min-width: 0;
  text-align: left;
}

.hero-ask-label {
  margin-bottom: 2px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
}

.hero-ask-note {
  font-size: 11px;
  opacity: 0.78;
}

.answer-mode-switch {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.answer-mode-btn {
  min-height: 28px;
  padding: 0 8px;
  border-radius: 0;
  font-size: 11px;
  font-weight: 500;
}

.answer-mode-btn.active {
  color: var(--vermilion);
  background: transparent;
  box-shadow: inset 0 -2px 0 var(--vermilion);
}

.hero-ask-input {
  min-height: 78px;
  padding: 12px 16px;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.hero-ask-input:focus-within {
  border-color: transparent;
  background: color-mix(in srgb, var(--bg) 45%, transparent);
  box-shadow: inset 0 0 0 1px var(--vermilion-glow);
}

.hero-ask-input textarea {
  min-height: 32px;
  padding: 6px 0;
  font-size: 16px;
}

.hero-ask-input button {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--vermilion) 18%, var(--bg-surface));
  color: var(--vermilion);
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.hero-ask-input button:disabled {
  opacity: 0.72;
}

.hero-ask-input button:not(:disabled):hover {
  transform: translateY(-1px);
  background: var(--vermilion);
  color: #fff;
}

.hero-question-examples {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 52%, transparent);
}

.hero-question-examples button {
  min-height: 42px;
  padding: 9px 12px;
  overflow: hidden;
  border: 0;
  border-right: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
  color: var(--text-secondary);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}

.hero-question-examples button:last-child {
  border-right: 0;
}

.hero-question-examples button:hover {
  border-bottom-color: transparent;
  background: var(--vermilion-glow);
  color: var(--vermilion);
}

.hero-stats {
  width: min(100%, 820px);
  justify-content: center;
  margin: 20px 0 0;
  padding: 11px 0;
  border-color: var(--border);
}

.stat {
  flex: 0 1 auto;
  flex-direction: row;
  align-items: baseline;
  gap: 6px;
  padding: 0 16px;
}

.stat:first-child {
  padding-left: 0;
}

.stat-number {
  font-size: 19px;
  font-weight: 700;
}

.stat-icon {
  display: none;
}

.stat-label {
  font-size: 11px;
  letter-spacing: 0.5px;
  text-transform: none;
}

.hero-actions {
  justify-content: center;
  margin: 18px 0 0;
  gap: 10px;
}

.hero-actions .btn-primary,
.hero-actions .btn-secondary {
  padding: 12px 16px;
}

[data-theme="dark"] body::before {
  opacity: 0.48;
}

[data-theme="dark"] .hero-ask {
  background: rgba(22, 22, 22, 0.86);
  border-color: rgba(245, 243, 238, 0.14);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

[data-theme="dark"] .hero-ask-input {
  background: transparent;
}

[data-theme="dark"] .hero-question-examples {
  background: rgba(12, 12, 12, 0.42);
}

/* Keep the module section quiet so the hero remains the first action. */
.modules {
  max-width: 1200px;
  padding-top: clamp(72px, 8vw, 104px);
  padding-bottom: clamp(72px, 8vw, 104px);
}

.module-card {
  border-radius: 8px;
  box-shadow: none;
}

.module-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.05);
}

.module-num {
  font-family: var(--font-serif-cn);
  font-size: 42px;
  font-weight: 400;
  letter-spacing: 0;
}

.module-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
}

.module-card .tag {
  padding: 4px 8px;
  border-radius: 5px;
  background: var(--vermilion-glow);
}

[data-theme="dark"] .module-card:hover {
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
}

/* Chat: one calm reading grid for empty state, answers, sources and composer. */
.chat-header {
  height: 70px;
  padding-left: max(24px, calc((100vw - 1120px) / 2));
  padding-right: max(24px, calc((100vw - 1120px) / 2));
}

.smart-chat-messages {
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: 34px 32px 56px;
}

.smart-chat-empty {
  max-width: 900px;
  margin: 0 auto;
  padding: 22px 24px 52px;
}

.smart-chat-empty h3 {
  font-size: 24px;
}

.smart-chat-empty p {
  margin-bottom: 24px;
}

.empty-starter-grid {
  width: 100%;
  max-width: 860px;
  gap: 0 18px;
}

.starter-card {
  min-height: 72px;
  padding: 16px 8px;
  border: 0;
  border-top: 1px solid var(--border-strong);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.starter-card:hover {
  transform: none;
  border-color: var(--border-strong);
  background: var(--vermilion-glow);
  box-shadow: none;
}

.smart-msg {
  width: min(100%, 900px);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 30px;
}

.smart-msg-body {
  max-width: 800px;
}

.smart-msg-assistant .smart-msg-text {
  font-size: 15.5px;
  line-height: 1.86;
}

.smart-msg-user .smart-msg-text {
  padding: 11px 16px;
  border-radius: 7px;
  border-bottom-right-radius: 2px;
}

.smart-msg-sources {
  max-width: 800px;
  margin-top: 24px;
  border-radius: 6px;
}

.smart-msg-toolbar {
  margin-top: 12px;
}

.smart-followup-wrap {
  width: min(100%, 800px);
  margin-left: auto;
  margin-right: auto;
}

.smart-chat-input-area {
  padding: 14px 24px max(18px, env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--bg) 88%, var(--bg-surface));
}

.smart-input-wrap,
.smart-input-options {
  width: min(100%, 900px);
}

.smart-input-wrap {
  border-radius: 7px;
  padding: 10px 12px 10px 16px;
}

.smart-input-wrap textarea {
  font-size: 15px;
}

.smart-input-options {
  margin-top: 9px;
}

@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding: calc(var(--nav-height) + 34px) 20px 52px;
  }

  .hero-content {
    display: flex;
    align-items: center;
    width: 100%;
  }

  .hero-title .line-cn {
    font-size: 40px;
  }

  .hero-desc {
    max-width: none;
    font-size: 14px;
  }

  .hero-ask {
    padding: 0;
  }

  .hero-ask-head {
    align-items: center;
    padding: 10px 12px 0;
  }

  .hero-ask-input {
    min-height: 74px;
    padding: 10px 12px;
  }

  .hero-question-examples {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .hero-question-examples button {
    min-height: 38px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    text-align: left;
    white-space: normal;
  }

  .hero-question-examples button:last-child {
    border-bottom: 0;
  }

  .hero-stats {
    width: 100%;
    margin: 14px 0 10px;
    flex-wrap: wrap;
  }

  .hero-stats .stat {
    flex: 1 1 45%;
    justify-content: center;
    padding: 7px 8px;
  }

  .hero-stats .stat:not(:last-child)::after {
    display: none;
  }

  .hero-actions {
    margin-top: 0;
    width: 100%;
    flex-direction: column;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .chat-header {
    height: 64px;
    padding-left: 10px;
    padding-right: 10px;
  }

  .smart-chat-messages {
    width: 100%;
    padding: 22px 14px 42px;
  }

  .smart-chat-empty {
    padding: 18px 0 42px;
  }

  .smart-chat-empty h3 {
    font-size: 22px;
  }

  .empty-starter-grid {
    grid-template-columns: 1fr;
    gap: 0;
    max-width: 360px;
  }

  .starter-card {
    min-height: 64px;
    padding: 13px 4px;
  }

  .smart-msg {
    width: 100%;
    margin-bottom: 24px;
  }

  .smart-msg-body,
  .smart-msg-text {
    max-width: calc(100vw - 62px);
  }

  .smart-msg-assistant .smart-msg-text {
    font-size: 14.5px;
  }

  .smart-msg-sources {
    max-width: calc(100vw - 62px);
  }

  .smart-chat-input-area {
    padding-left: 8px;
    padding-right: 8px;
  }
}


/* ============ FRONTEND EXPERIENCE V11B ============ */
.starter-card {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  grid-template-rows: auto auto;
  align-items: center;
}

.starter-icon {
  grid-column: 1;
  grid-row: 1 / 3;
}

.starter-text,
.starter-hint {
  grid-column: 2;
  min-width: 0;
}

.starter-text {
  line-height: 1.35;
}

.starter-hint {
  margin-top: 2px;
  line-height: 1.35;
}

/* ============ Agents ============ */
.agents { max-width: var(--max-width); margin: 0 auto; padding: var(--space-2xl) var(--space-lg); }
.agents-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin-top: var(--space-lg); }
.agent-card { padding: 20px; background: var(--bg-surface); border: 1px solid var(--border); border-radius: 14px; text-align: left; cursor: pointer; transition: all 0.25s var(--ease); }
.agent-card:hover { border-color: var(--vermilion); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(196,30,58,0.1); }
.agent-card h4 { margin: 8px 0 4px; font-size: 15px; }
.agent-card p { font-size: 12px; color: var(--text-secondary); }
.agent-icon { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; background: var(--vermilion-glow); color: var(--vermilion); border-radius: 8px; font-weight: 700; }
.agent-switch { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; max-width: 800px; margin: 0 auto; padding: 12px 16px; background: var(--bg-surface); border-bottom: 1px solid var(--border); }
.agent-switch-btn { min-width: 56px; min-height: 36px; padding: 8px 16px; border: 1px solid var(--border-strong); background: var(--surface-2); color: var(--text-secondary); border-radius: 20px; font-size: 13px; cursor: pointer; white-space: nowrap; transition: all 0.2s var(--ease); }
.agent-switch-btn:hover { border-color: var(--vermilion); color: var(--vermilion); }
.agent-switch-btn.active { background: var(--vermilion); color: #fff; border-color: var(--vermilion); }
[data-theme="dark"] .agent-switch-btn { background: #1E1E1E; border-color: rgba(245,243,238,0.12); }
[data-theme="dark"] .agent-switch-btn.active { background: var(--vermilion); color: #fff; border-color: var(--vermilion); }
@media (max-width: 768px) { .agents-grid { grid-template-columns: repeat(2, 1fr); } }

/* ============ Voice Input ============ */
.voice-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s var(--ease);
}
.voice-btn:hover { border-color: var(--vermilion); color: var(--vermilion); }
.voice-btn.listening {
  background: var(--vermilion);
  color: #fff;
  border-color: var(--vermilion);
  animation: voicePulse 1.2s ease-in-out infinite;
}
@keyframes voicePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(196,30,58,0.3); }
  50% { box-shadow: 0 0 0 8px rgba(196,30,58,0); }
}
.voice-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.hero-ask-input .voice-btn,
.smart-input-wrap .voice-btn { width: 38px; height: 38px; }
.hero-ask-input { gap: 8px; }
.smart-input-wrap { gap: 8px; }



/* ============================================================
   V12 CHAT REDESIGN — 人性知识库 · 对话页
   作用域：.chat-section 内全部新类名（c-*）
   旧 .smart-* 规则不再被引用，P3 清理
   ============================================================ */

.chat-section {
  --acc: var(--vermilion);
  --acc-soft: rgba(196, 30, 58, 0.07);
  --acc-glow: rgba(196, 30, 58, 0.16);
  --acc-border: rgba(196, 30, 58, 0.35);
}

[data-theme="dark"] .chat-section {
  --acc: #E8354F;
  --acc-soft: rgba(232, 53, 79, 0.1);
  --acc-glow: rgba(232, 53, 79, 0.22);
  --acc-border: rgba(232, 53, 79, 0.4);
}

/* ---------- 顶栏 ---------- */
.chat-topbar {
  height: 60px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(14px, 2.5vw, 28px);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}

.ct-left { display: flex; align-items: center; gap: 10px; min-width: 0; }

.ct-btn {
  width: 34px; height: 34px; flex-shrink: 0;
  border-radius: 9px;
  border: none; background: transparent;
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background .25s, color .25s;
}
.ct-btn:hover { background: var(--vermilion-glow); color: var(--acc); }

.ct-brand { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.ct-title {
  font-family: var(--font-serif-cn);
  font-weight: 700; font-size: 15px;
  letter-spacing: .05em;
  color: var(--text);
  white-space: nowrap;
}
.ct-sub {
  font-size: 11px; color: var(--text-tertiary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 340px;
}

.ct-actions { display: flex; align-items: center; gap: 8px; }

.ghost-btn {
  height: 34px; padding: 0 15px;
  border: 1px solid var(--border-strong); border-radius: 9px;
  background: transparent; color: var(--text-secondary);
  font-family: var(--font-body); font-size: 12.5px; font-weight: 500;
  letter-spacing: .03em;
  cursor: pointer;
  transition: all .25s var(--ease);
  white-space: nowrap;
}
.ghost-btn:hover {
  border-color: var(--acc); color: var(--acc);
  background: var(--acc-soft);
}

/* ---------- 智能体切换条（精修） ---------- */
.agent-switch {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
  padding: 8px 16px;
  background: transparent;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  overflow-y: hidden;
  flex-wrap: nowrap;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.agent-switch::-webkit-scrollbar { display: none; }
@media (min-width: 721px) {
  .agent-switch { justify-content: center; overflow-x: visible; }
}
.agent-switch-btn {
  min-width: 0; min-height: 0;
  flex-shrink: 0;
  padding: 5px 14px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 99px;
  font-family: var(--font-body);
  font-size: 12.5px;
  cursor: pointer;
  white-space: nowrap;
  transition: all .22s var(--ease);
}
.agent-switch-btn:hover { color: var(--acc); background: var(--acc-soft); }
.agent-switch-btn.active {
  background: var(--acc-soft);
  color: var(--acc);
  border-color: var(--acc-border);
  font-weight: 600;
}
[data-theme="dark"] .agent-switch-btn.active {
  background: var(--acc-soft);
  color: var(--acc);
}

/* ---------- 消息滚动区 ---------- */
.chat-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 36px clamp(16px, 4vw, 32px) 28px;
  scroll-behavior: smooth;
}
.chat-messages::-webkit-scrollbar { width: 10px; }
.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 99px;
  border: 3px solid var(--bg);
}
.chat-messages::-webkit-scrollbar-track { background: transparent; }

@keyframes cMsgIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 用户消息 ---------- */
.c-msg {
  max-width: 800px;
  margin: 0 auto 34px;
  display: flex;
  animation: cMsgIn .45s var(--ease);
}

.c-msg-user {
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
}

.c-bubble {
  max-width: 78%;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 20px;
  border-radius: 18px 18px 5px 18px;
  font-size: 15px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

[data-theme="dark"] .c-bubble {
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--border-strong);
}

.c-edit {
  width: 30px; height: 30px; flex-shrink: 0;
  border: none; border-radius: 8px;
  background: transparent; color: var(--text-tertiary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity .25s, background .2s, color .2s;
}
.c-edit svg { width: 15px; height: 15px; }
.c-msg-user:hover .c-edit { opacity: 1; }
.c-edit:hover { background: var(--vermilion-glow); color: var(--acc); }

/* ---------- 助手消息 ---------- */
.c-msg-ai { gap: 14px; }

.c-avatar {
  width: 30px; height: 30px; flex-shrink: 0;
  margin-top: 2px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  display: flex; align-items: center; justify-content: center;
}
.c-core {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--acc);
  animation: cCoreBreath 3.2s ease-in-out infinite;
}
@keyframes cCoreBreath {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(.7); opacity: .55; }
}

.c-body {
  flex: 1;
  min-width: 0;
  max-width: 720px;
}

/* ---------- 加载态 ---------- */
.c-loading {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.c-dots { display: inline-flex; gap: 5px; }
.c-dots i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-tertiary);
  animation: cDotBounce 1.2s ease-in-out infinite;
}
.c-dots i:nth-child(2) { animation-delay: .15s; }
.c-dots i:nth-child(3) { animation-delay: .3s; }
@keyframes cDotBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: .4; }
  30% { transform: translateY(-5px); opacity: 1; background: var(--acc); }
}
.c-loading-text { font-size: 13px; color: var(--text-secondary); }

/* ---------- 思考阶段 ---------- */
.c-thinking {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 9px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 16px;
  transition: opacity .5s, transform .5s;
}
.c-thinking.done { opacity: .55; }
.c-thinking.collapsed, .c-thinking.gone {
  opacity: 0;
  max-height: 0;
  padding-top: 0; padding-bottom: 0;
  margin-bottom: 0;
  border-color: transparent;
  overflow: hidden;
  transform: translateY(-4px);
}

.c-stage {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px;
  color: var(--text-tertiary);
  transition: color .3s;
}
.c-stage-ic { display: inline-flex; }
.c-stage-ic svg { width: 13px; height: 13px; }
.c-stage.active { color: var(--acc); font-weight: 500; }
.c-stage.active .c-stage-ic { animation: cSpin 1.2s linear infinite; }
.c-stage.done { color: var(--text-secondary); }
.c-stage.done .c-stage-ic { color: var(--acc); }
.c-stage-arrow { color: var(--text-tertiary); font-size: 11px; }
@keyframes cSpin { to { transform: rotate(360deg); } }

/* ---------- 回答排版 ---------- */
.c-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
  word-break: break-word;
}
.c-text > * + * { margin-top: 14px; }
.c-text > :first-child { margin-top: 0; }

.c-text p { color: var(--text); }

.c-text h2 {
  font-family: var(--font-serif-cn);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--text);
  margin-top: 28px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.c-text h3 {
  font-family: var(--font-serif-cn);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .03em;
  color: var(--text);
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.c-text h3::before {
  content: '';
  width: 3px; height: 15px;
  background: var(--acc);
  border-radius: 2px;
  flex-shrink: 0;
}
.c-text h4 {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 18px;
  letter-spacing: .02em;
}
.c-text strong { font-weight: 600; }

.c-answer-summary-title,
.c-text .answer-summary-title {
  color: var(--acc);
  letter-spacing: .12em;
  font-size: 15px;
}
.c-text .answer-summary-title::before { display: none; }

.c-text ul, .c-text ol {
  padding-left: 4px;
  list-style: none;
}
.c-text ul li, .c-text ol li {
  position: relative;
  padding-left: 22px;
  margin-top: 8px;
  color: var(--text);
}
.c-text ul li::before {
  content: '';
  position: absolute;
  left: 6px; top: .72em;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--border-strong);
}
.c-text ol { counter-reset: coli; }
.c-text ol li { counter-increment: coli; }
.c-text ol li::before {
  content: counter(coli);
  position: absolute;
  left: 0; top: .3em;
  width: 16px; height: 16px;
  font-family: var(--font-body);
  font-size: 10.5px; font-weight: 600;
  color: var(--acc);
  border: 1px solid var(--acc-border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
}

.c-text blockquote {
  border-left: 2px solid var(--border-strong);
  padding: 4px 0 4px 16px;
  color: var(--text-secondary);
  font-family: var(--font-serif-cn);
  font-size: 14px;
  line-height: 1.8;
}
.c-text blockquote strong { color: var(--text); }

.c-text hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 22px 0;
}

/* 表格 */
.c-tblwrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-top: 16px;
}
.c-text table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
.c-text thead th {
  background: var(--bg-surface);
  font-weight: 600;
  color: var(--text-secondary);
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  letter-spacing: .02em;
}
.c-text tbody td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.c-text tbody tr:last-child td { border-bottom: none; }
.c-text tbody tr { transition: background .2s; }
.c-text tbody tr:hover { background: var(--acc-soft); }
.c-text td:first-child { font-weight: 600; white-space: nowrap; }

/* 代码块 */
.c-codeblock {
  background: #1E1D1B;
  border-radius: 12px;
  overflow: hidden;
  margin-top: 16px;
}
.cb-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid rgba(255,255,255,.07);
}
.cb-lang {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #8E8A7E;
  letter-spacing: .08em;
}
.cb-copy {
  border: none;
  background: transparent;
  color: #8E8A7E;
  font-family: var(--font-body);
  font-size: 11px;
  cursor: pointer;
  transition: color .2s;
}
.cb-copy:hover { color: #F1EFE8; }
.c-codeblock pre { padding: 16px; overflow-x: auto; }
.c-codeblock code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #E8E6DE;
  line-height: 1.7;
  background: transparent;
  padding: 0;
}

/* 行内代码 */
.c-text code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--vermilion-glow);
  color: var(--acc);
  padding: 2px 6px;
  border-radius: 6px;
}

/* 行内引用角标 */
.c-text .citation, .citation {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 17px; height: 17px;
  padding: 0 4px;
  margin: 0 2px;
  border-radius: 6px;
  background: var(--acc-soft);
  color: var(--acc);
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 600;
  cursor: pointer;
  vertical-align: super;
  line-height: 1;
  transition: all .2s;
}
.citation:hover {
  background: var(--acc);
  color: #fff;
  transform: translateY(-2px);
}

/* 流式光标 */
.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 1.05em;
  background: var(--acc);
  vertical-align: text-bottom;
  margin-left: 2px;
  border-radius: 1px;
  animation: cCursor 1s ease-in-out infinite;
}
@keyframes cCursor { 0%, 100% { opacity: 1; } 50% { opacity: .15; } }

/* ---------- 参考来源 ---------- */
.c-sources { margin-top: 20px; }

.c-sources-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  border-radius: 99px;
  padding: 7px 16px;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .25s;
  user-select: none;
  list-style: none;
}
.c-sources-toggle::-webkit-details-marker { display: none; }
.c-sources-toggle:hover { border-color: var(--border-strong); color: var(--text); }
.c-sources-toggle svg { width: 13px; height: 13px; }
.c-sources-label b { color: var(--acc); font-weight: 600; }
.c-sources-note { color: var(--text-tertiary); font-size: 11.5px; }
.c-sources-chev { transition: transform .3s var(--ease); }
.c-sources[open] .c-sources-chev { transform: rotate(180deg); }

.c-sources-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
  animation: cMsgIn .35s var(--ease);
}

.source-card {
  border: 1px solid var(--border);
  background: var(--bg-surface);
  border-radius: 12px;
  padding: 13px 15px;
  cursor: pointer;
  transition: all .25s var(--ease);
}
.source-card:hover {
  border-color: var(--acc-border);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,.06);
}
.source-card.c-src-flash {
  border-color: var(--acc);
  box-shadow: 0 0 0 3px var(--acc-soft);
}

.c-src-top { display: flex; align-items: center; gap: 9px; margin-bottom: 7px; }
.c-src-idx {
  width: 20px; height: 20px; flex-shrink: 0;
  border-radius: 6px;
  background: var(--acc-soft);
  color: var(--acc);
  font-family: var(--font-body);
  font-size: 11px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}
.c-src-title {
  font-size: 13px; font-weight: 600;
  color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  flex: 1;
}
.c-src-score { font-size: 10.5px; color: var(--text-tertiary); white-space: nowrap; }
.c-src-high { color: #2E9E5B; }
.c-src-mid { color: #D9A038; }
.c-src-low { color: var(--text-tertiary); }
.c-src-snippet {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.c-src-bar {
  height: 2px;
  background: var(--border);
  border-radius: 99px;
  margin-top: 9px;
  overflow: hidden;
}
.c-src-bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--acc), var(--acc-border));
  border-radius: 99px;
}

/* ---------- 置信度 / 深度徽章 / 警告 ---------- */
.c-conf {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 16px;
  font-size: 11.5px;
  color: var(--text-tertiary);
  letter-spacing: .05em;
}
.c-conf::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.c-conf-high::before { background: #2E9E5B; box-shadow: 0 0 6px rgba(46,158,91,.4); }
.c-conf-medium::before { background: #D9A038; }
.c-conf-low::before { background: var(--text-tertiary); }
.c-conf svg { width: 14px; height: 14px; }

.c-deep-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 14px;
  padding: 6px 14px;
  border-radius: 99px;
  background: var(--acc-soft);
  border: 1px solid var(--acc-border);
  color: var(--acc);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .04em;
}
.c-deep-badge .deep-badge-icon { display: inline-flex; }
.c-deep-badge .deep-badge-icon svg { width: 13px; height: 13px; }

/* ---------- 工具栏（hover 浮现） ---------- */
.c-toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-top: 14px;
  opacity: 0;
  transform: translateY(-3px);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
  pointer-events: none;
}
.c-msg-ai:hover .c-toolbar,
.c-toolbar:focus-within {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.c-tool {
  width: 30px; height: 30px;
  border: none; background: transparent;
  border-radius: 8px;
  color: var(--text-tertiary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all .2s;
}
.c-tool:hover { background: var(--vermilion-glow); color: var(--text); }
.c-tool.active { color: var(--acc); }
.c-tool svg { width: 15px; height: 15px; }
.c-tool-sep { width: 1px; height: 14px; background: var(--border-strong); margin: 0 6px; }
.c-tool-label { font-size: 11px; color: var(--text-tertiary); margin-left: 8px; letter-spacing: .04em; }

/* ---------- 追问建议 ---------- */
.c-followups {
  max-width: 800px;
  margin: -14px auto 34px;
  padding-top: 18px;
  border-top: 1px dashed var(--border-strong);
}
.c-fu-title {
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}
.c-fu-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  border-radius: 12px;
  padding: 11px 16px;
  margin-bottom: 8px;
  font-family: var(--font-body);
  font-size: 13.5px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .25s var(--ease);
  animation: cMsgIn .5s var(--ease) backwards;
}
.c-fu-chip:nth-child(3) { animation-delay: .08s; }
.c-fu-chip:nth-child(4) { animation-delay: .16s; }
.c-fu-chip:hover {
  border-color: var(--acc);
  color: var(--acc);
  background: var(--acc-soft);
  transform: translateX(4px);
}
.c-fu-chip::after {
  content: '→';
  margin-left: auto;
  color: var(--text-tertiary);
  font-size: 13px;
  transition: transform .25s var(--ease), color .25s;
}
.c-fu-chip:hover::after { color: var(--acc); transform: translateX(3px); }

/* ---------- 空状态 ---------- */
.c-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 60vh;
  padding: 40px 24px;
  animation: cMsgIn .5s var(--ease);
}
.c-empty-mark {
  width: 56px; height: 56px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 26px;
}
.c-empty-mark span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--acc);
  animation: cCoreBreath 3.2s ease-in-out infinite;
}
.c-empty h3 {
  font-family: var(--font-serif-cn);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: .08em;
  margin-bottom: 10px;
  color: var(--text);
}
.c-empty p {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.c-starter-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 620px;
  width: 100%;
}
.c-starter {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  text-align: left;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  border-radius: 14px;
  padding: 16px 18px;
  font-family: var(--font-body);
  cursor: pointer;
  transition: all .28s var(--ease);
}
.c-starter svg {
  width: 17px; height: 17px;
  stroke: var(--acc);
  stroke-width: 1.6;
  fill: none;
  margin-bottom: 6px;
  opacity: .75;
}
.c-starter-text {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.c-starter-hint {
  font-size: 11.5px;
  color: var(--text-tertiary);
}
.c-starter:hover {
  border-color: var(--acc);
  background: var(--acc-soft);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(196,30,58,.08);
}

/* ---------- 输入区（悬浮胶囊） ---------- */
.c-input-dock {
  flex-shrink: 0;
  padding: 14px clamp(16px, 4vw, 32px) calc(16px + env(safe-area-inset-bottom, 0px));
  background: linear-gradient(to top, var(--bg) 78%, transparent);
  position: relative;
}
@media (max-width: 720px) {
  .c-input-dock {
    padding: 10px 10px calc(10px + env(safe-area-inset-bottom, 0px));
    background: var(--bg);
  }
  .c-ask { border-radius: 18px; }
  .c-ask-row { padding: 14px 12px 6px 16px; gap: 8px; }
  .c-ask textarea { font-size: 16px; min-height: 34px; padding: 6px 0; }
  .c-send { width: 44px; height: 44px; border-radius: 13px; }
  .c-voice { width: 40px; height: 40px; }
  .c-ask-foot { padding: 6px 12px 12px 16px; justify-content: space-between; }
  .c-modes .answer-mode-btn { padding: 8px 14px; font-size: 13px; }
}

.c-ask {
  position: relative;
  max-width: 730px;
  margin: 0 auto;
  background: var(--bg-surface);
  border-radius: 20px;
  box-shadow: 0 2px 6px rgba(0,0,0,.05), 0 18px 56px rgba(0,0,0,.1);
  overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.c-ask::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--border-strong), transparent 38%, transparent 62%, var(--border-strong));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  pointer-events: none;
  transition: background .3s;
}
.c-ask:focus-within { transform: translateY(-3px); }
.c-ask:focus-within::before {
  background: linear-gradient(135deg, var(--acc), transparent 45%, transparent 55%, var(--acc));
}
.c-ask:focus-within {
  box-shadow: 0 0 0 5px var(--acc-soft), 0 2px 6px rgba(0,0,0,.05), 0 18px 56px rgba(0,0,0,.1);
}

.c-ask-row {
  display: flex;
  align-items: flex-end;
  padding: 16px 14px 8px 22px;
  gap: 12px;
}
.c-ask textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  min-height: 28px;
  max-height: 150px;
  padding: 3px 0;
  caret-color: var(--acc);
}
.c-ask textarea::placeholder { color: var(--text-tertiary); }

.c-voice {
  width: 34px; height: 34px; flex-shrink: 0;
  border: none; border-radius: 9px;
  background: transparent; color: var(--text-tertiary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all .25s;
}
.c-voice:hover { background: var(--vermilion-glow); color: var(--acc); }
.c-voice.listening { color: var(--acc); animation: cCoreBreath 1.2s ease-in-out infinite; }

.c-send {
  width: 40px; height: 40px; flex-shrink: 0;
  border: none;
  border-radius: 12px;
  background: var(--vermilion-glow);
  color: var(--text-tertiary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all .3s var(--ease);
}
.c-send svg { width: 17px; height: 17px; transition: transform .3s var(--ease); }
.c-send:disabled { cursor: default; }
.c-send.ready {
  background: linear-gradient(160deg, var(--acc), #A31830);
  color: #fff;
  box-shadow: 0 4px 16px var(--acc-glow);
}
.c-send.ready:hover { transform: scale(1.07); }
.c-send.ready:hover svg { transform: translateX(2px) rotate(8deg); }
.c-send.ready:active { transform: scale(.95); }
.c-send.stop {
  background: var(--ink);
  color: var(--paper);
}
[data-theme="dark"] .c-send.stop { background: var(--bg-elevated); color: var(--text); }

.c-ask-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px 14px 22px;
  flex-wrap: wrap;
  gap: 10px;
}

.c-modes {
  display: flex;
  gap: 4px;
  background: var(--paper-warm);
  border-radius: 11px;
  padding: 3px;
}
[data-theme="dark"] .c-modes { background: var(--bg-elevated); }
.c-modes .answer-mode-btn {
  border: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 15px;
  border-radius: 8px;
  cursor: pointer;
  transition: all .25s var(--ease);
}
.c-modes .answer-mode-btn.active {
  background: var(--bg-surface);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,.09), 0 0 0 .5px var(--border);
}

.c-hint {
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: .04em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .ct-sub { display: none; }
  .c-sources-panel { grid-template-columns: 1fr; }
  .chat-messages { padding: 20px 14px 16px; }
  .c-bubble { max-width: 88%; }
  .c-body { max-width: calc(100% - 42px); }
  .c-starter-grid { grid-template-columns: 1fr; }
  .c-empty { min-height: 50vh; }
  .c-hint { display: none; }
  .c-tool-label { display: none; }
  .c-toolbar { opacity: 1; transform: none; pointer-events: auto; }
  .agent-switch { padding: 8px 12px; }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .chat-section *,
  .chat-section *::before,
  .chat-section *::after {
    animation-duration: .01s !important;
    transition-duration: .01s !important;
  }
}



/* ============================================================
   V12 HOMEPAGE REDESIGN — 人性知识库 · 首页 V2
   一屏极简 · 编辑排版 · 背景微动效 · 朱红只做焦点
   ============================================================ */

/* ---------- 背景层 ---------- */
.bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.bg-glow {
  position: absolute; left: 50%; top: 38%;
  width: 900px; height: 640px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse at center, var(--vermilion-glow) 0%, transparent 62%);
  filter: blur(10px);
  animation: hmGlowBreath 9s ease-in-out infinite;
  opacity: .5;
}
@keyframes hmGlowBreath {
  0%, 100% { opacity: .38; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: .68; transform: translate(-50%, -50%) scale(1.06); }
}
.bg-watermark {
  position: absolute; left: 50%; top: 44%;
  transform: translate(-50%, -50%);
  font-family: var(--font-serif-cn); font-weight: 900;
  font-size: clamp(220px, 36vw, 520px);
  line-height: 1; letter-spacing: .06em;
  color: transparent;
  -webkit-text-stroke: 1px var(--border);
  white-space: nowrap;
  opacity: .5;
  animation: hmWmDrift 36s ease-in-out infinite alternate;
}
@keyframes hmWmDrift {
  from { transform: translate(calc(-50% - 14px), -50%); }
  to   { transform: translate(calc(-50% + 14px), -50%); }
}
.fc {
  position: absolute;
  font-family: var(--font-serif-cn); font-weight: 900;
  color: var(--text);
  opacity: 0;
  user-select: none;
  animation:
    hmFcIn 2.4s var(--ease) var(--del) forwards,
    hmFcFloat var(--dur) ease-in-out calc(var(--del) + 2.4s) infinite alternate,
    hmFcBreath 7s ease-in-out calc(var(--del) + 2.4s) infinite;
}
@keyframes hmFcIn { to { opacity: var(--o); } }
@keyframes hmFcFloat { from { transform: translateY(-14px); } to { transform: translateY(16px); } }
@keyframes hmFcBreath { 0%, 100% { opacity: var(--o); } 50% { opacity: calc(var(--o) * .35); } }
.bg-noise {
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");
}
[data-theme="dark"] .bg-noise { opacity: .8; }

/* 首页内容置于背景层之上 */
.navbar, .hero, .agents, .modules, .quote, .footer, .back-to-top { position: relative; z-index: 1; }

/* ---------- 导航增补 ---------- */
.nav-cta {
  width: auto; min-width: 0;
  height: 36px; padding: 0 18px;
  border: 1px solid var(--border-strong); border-radius: 10px;
  background: transparent; color: var(--text);
  font-family: var(--font-body); font-size: 13px; font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  transition: all .25s var(--ease);
}
.nav-cta:hover { border-color: var(--vermilion); color: var(--vermilion); background: var(--vermilion-glow); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 110px 24px 110px;
}
.hero-inner { width: 100%; max-width: 800px; display: flex; flex-direction: column; align-items: center; position: relative; }

.hero-eyebrow {
  font-size: 12px; letter-spacing: .46em; text-indent: .46em;
  color: var(--text-secondary);
  margin-bottom: 30px;
  display: flex; align-items: center; gap: 16px;
}
.hero-eyebrow::before, .hero-eyebrow::after {
  content: ''; width: 32px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong));
}
.hero-eyebrow::after { background: linear-gradient(90deg, var(--border-strong), transparent); }

.hero-title {
  font-family: var(--font-serif-cn); font-weight: 900;
  font-size: clamp(46px, 7.6vw, 80px);
  line-height: 1.14; letter-spacing: .06em;
  color: var(--text);
  margin-bottom: 14px;
  display: flex; align-items: flex-start; justify-content: center; gap: 14px;
}
.hero-title .t {
  background: linear-gradient(175deg, var(--text) 55%, var(--text-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.seal {
  flex-shrink: 0;
  width: clamp(30px, 3.4vw, 40px); height: clamp(30px, 3.4vw, 40px);
  margin-top: clamp(4px, .8vw, 10px);
  background: linear-gradient(160deg, var(--vermilion), #A31830);
  border-radius: 18%;
  color: #FBF6EE;
  font-family: var(--font-serif-cn); font-weight: 900;
  font-size: clamp(15px, 1.7vw, 20px);
  display: flex; align-items: center; justify-content: center;
  transform: rotate(4deg);
  box-shadow: 0 2px 10px rgba(196,30,58,.28), inset 0 0 0 1.5px rgba(255,255,255,.22);
  line-height: 1; padding-top: 1px;
}
.hero-title-en {
  font-family: 'Inter', var(--font-body);
  font-size: clamp(11px, 1.3vw, 14px);
  font-weight: 400;
  letter-spacing: .52em; text-indent: .52em;
  color: var(--text-tertiary);
  text-transform: uppercase;
  margin-bottom: 30px;
}
.hero-desc {
  font-size: 15px; color: var(--text-secondary);
  max-width: 470px; line-height: 2;
  margin-bottom: 46px;
}
.hero-desc em { font-style: normal; color: var(--text); font-weight: 600; padding: 0 2px; }

/* ---------- 首页提问框 ---------- */
.hero .ask {
  position: relative;
  width: 100%; max-width: 730px;
  background: var(--bg-surface);
  border-radius: 22px;
  box-shadow: 0 2px 6px rgba(0,0,0,.05), 0 18px 56px rgba(0,0,0,.1);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
  overflow: hidden;
}
.hero .ask::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--border-strong), rgba(19,18,16,.03) 38%, rgba(19,18,16,.03) 62%, var(--border-strong));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  pointer-events: none;
  transition: background .3s;
}
[data-theme="dark"] .hero .ask::before {
  background: linear-gradient(135deg, var(--border-strong), rgba(241,239,232,.02) 38%, rgba(241,239,232,.02) 62%, var(--border-strong));
}
.hero .ask:focus-within { transform: translateY(-3px); }
.hero .ask:focus-within::before {
  background: linear-gradient(135deg, var(--vermilion), rgba(196,30,58,.25) 45%, rgba(196,30,58,.25) 55%, var(--vermilion));
}
.hero .ask:focus-within { box-shadow: 0 0 0 5px var(--vermilion-glow), 0 2px 6px rgba(0,0,0,.05), 0 18px 56px rgba(0,0,0,.1); }

.ask-input-row { display: flex; align-items: flex-end; padding: 20px 18px 10px 24px; gap: 12px; }
.ask-input-row textarea {
  flex: 1; border: none; outline: none; resize: none;
  background: transparent; color: var(--text);
  font-family: var(--font-body); font-size: 16px; line-height: 1.65;
  min-height: 30px; max-height: 150px;
  padding: 3px 0;
  caret-color: var(--vermilion);
}
.ask-input-row textarea::placeholder { color: var(--text-tertiary); }

.ask-input-row button, .hero .ask #heroQuestionSend {
  width: 42px; height: 42px; flex-shrink: 0;
  border: none; border-radius: 13px;
  background: var(--paper-warm); color: var(--text-tertiary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all .3s var(--ease);
}
.hero .ask #heroQuestionSend svg { width: 18px; height: 18px; transition: transform .3s var(--ease); }
.hero .ask #heroQuestionSend:not(:disabled) {
  background: linear-gradient(160deg, var(--vermilion), #A31830);
  color: #fff;
  box-shadow: 0 4px 16px rgba(196,30,58,.32);
}
.hero .ask #heroQuestionSend:not(:disabled):hover { transform: scale(1.07); }
.hero .ask #heroQuestionSend:not(:disabled):hover svg { transform: translateX(2px) rotate(8deg); }
.hero .ask #heroQuestionSend:active { transform: scale(.95); }

.ask-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 16px 16px 24px;
}
.ask-toolbar .answer-mode-switch {
  display: flex; gap: 4px;
  background: var(--paper-warm); border-radius: 11px; padding: 3px;
}
[data-theme="dark"] .ask-toolbar .answer-mode-switch { background: var(--bg-elevated); }
.ask-toolbar .answer-mode-btn {
  border: none; background: transparent;
  font-family: var(--font-body); font-size: 12.5px; font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 15px; border-radius: 8px;
  cursor: pointer;
  transition: all .25s var(--ease);
}
.ask-toolbar .answer-mode-btn.active {
  background: var(--bg-surface); color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,.09), 0 0 0 .5px var(--border);
}
.hero .voice-btn {
  width: 34px; height: 34px; border-radius: 9px;
  border: none; background: transparent; color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all .25s;
}
.hero .voice-btn:hover { background: var(--vermilion-glow); color: var(--vermilion); }
.hero .voice-btn.listening { color: var(--vermilion); animation: hmCoreBreath 1.2s ease-in-out infinite; }

/* ---------- chips ---------- */
.ask-examples {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 10px; margin-top: 24px;
}
.chip {
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body); font-size: 13px;
  letter-spacing: .02em;
  padding: 8px 19px; border-radius: 99px;
  cursor: pointer;
  transition: all .28s var(--ease);
  opacity: 0; transform: translateY(10px);
  animation: hmChipIn .7s var(--ease) var(--del, 0s) forwards;
}
@keyframes hmChipIn { to { opacity: 1; transform: translateY(0); } }
.chip:hover {
  border-color: var(--vermilion); color: var(--vermilion);
  background: var(--vermilion-glow);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(196,30,58,.1);
}

/* ---------- 信任行 ---------- */
.hero-proof {
  margin-top: 52px;
  display: flex; align-items: center; gap: 18px;
  font-size: 12px; color: var(--text-tertiary); letter-spacing: .12em;
}
.hero-proof .sep { width: 1px; height: 12px; background: var(--border-strong); }
.hero-proof strong { color: var(--text-secondary); font-weight: 600; }

/* ---------- 滚动提示 ---------- */
.scroll-hint {
  margin-top: 40px;
  color: var(--text-tertiary); font-size: 10px; letter-spacing: .4em; text-indent: .4em;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  opacity: .75; cursor: pointer;
}
.scroll-hint::after {
  content: ''; width: 1px; height: 30px;
  background: linear-gradient(var(--border-strong), transparent);
  animation: hmDrip 2.4s var(--ease) infinite;
}
@keyframes hmDrip { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------- 通用 section 标签 ---------- */
.section-label {
  font-size: 11px; letter-spacing: .42em; text-indent: .42em;
  color: var(--text-tertiary);
  display: flex; align-items: center; gap: 18px;
  margin-bottom: 40px;
}
.section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* ---------- 智能体（首页精修） ---------- */
.agents { max-width: 1200px; margin: 0 auto; padding: 90px clamp(20px, 4vw, 48px) 30px; }
.agents-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.agent-card {
  padding: 22px 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  text-align: left;
  cursor: pointer;
  transition: all .28s var(--ease);
  position: relative;
  overflow: hidden;
}
.agent-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 2px; background: var(--vermilion);
  transform: scaleX(0); transform-origin: left;
  transition: transform .4s var(--ease);
}
.agent-card:hover::before { transform: scaleX(1); }
.agent-card:hover {
  border-color: rgba(196,30,58,.35);
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(196,30,58,.09);
}
.agent-card h4 {
  margin: 10px 0 4px;
  font-family: var(--font-serif-cn);
  font-weight: 700; font-size: 17px; letter-spacing: .06em;
  color: var(--text);
}
.agent-card p { font-size: 12px; color: var(--text-secondary); }
.agent-icon {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  background: var(--vermilion-glow);
  color: var(--vermilion);
  border-radius: 9px;
  font-weight: 700;
}

/* ---------- 知识版图（纯文字编号条） ---------- */
.modules { max-width: 1200px; margin: 0 auto; padding: 70px clamp(20px, 4vw, 48px) 60px; }
.module-row { display: grid; grid-template-columns: repeat(6, 1fr); border-top: 1px solid var(--border); }
.module-item {
  position: relative;
  padding: 30px 20px 34px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  cursor: pointer;
  transition: background .3s var(--ease);
  overflow: hidden;
}
.module-item::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 2px; background: var(--vermilion);
  transform: scaleX(0); transform-origin: left;
  transition: transform .4s var(--ease);
}
.module-item:last-child { border-right: none; }
.module-item:hover { background: rgba(0,0,0,.018); }
[data-theme="dark"] .module-item:hover { background: rgba(255,255,255,.02); }
.module-item:hover::before { transform: scaleX(1); }
.module-num {
  font-family: 'Inter', var(--font-body);
  font-size: 11px; font-weight: 600; letter-spacing: .18em;
  color: var(--text-tertiary);
  margin-bottom: 16px;
  transition: color .3s;
}
.module-item:hover .module-num { color: var(--vermilion); }
.module-name {
  font-family: var(--font-serif-cn); font-weight: 700;
  font-size: 19px; letter-spacing: .08em;
  margin-bottom: 9px;
  color: var(--text);
}
.module-desc {
  font-size: 12.5px; color: var(--text-secondary); line-height: 1.75;
  max-height: 0; opacity: 0;
  transition: max-height .4s var(--ease), opacity .35s;
}
.module-item:hover .module-desc { max-height: 90px; opacity: 1; }

/* ---------- 引言 ---------- */
.quote { padding: 110px 24px; text-align: center; }
.quote blockquote {
  font-family: var(--font-serif-cn); font-weight: 600;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 2.1; letter-spacing: .08em;
  max-width: 660px; margin: 0 auto;
  color: var(--text);
}
.quote cite {
  display: block; margin-top: 28px;
  font-style: normal; font-size: 11px;
  color: var(--text-tertiary); letter-spacing: .34em;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 36px clamp(20px, 4vw, 48px) 42px;
  background: var(--paper-warm);
}
[data-theme="dark"] .footer { background: var(--paper-warm); }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 22px;
}
.footer-left { display: flex; align-items: baseline; gap: 16px; font-size: 12.5px; color: var(--text-secondary); }
.footer-brand { font-family: var(--font-serif-cn); font-weight: 700; font-size: 14px; color: var(--text); letter-spacing: .05em; }
.footer-links { display: flex; gap: 24px; }
.footer-link {
  border: none; background: transparent; padding: 0;
  font-family: var(--font-body); font-size: 12.5px;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: color .25s;
}
.footer-link::after {
  content: ''; position: absolute; left: 0; bottom: -3px;
  width: 100%; height: 1px; background: var(--vermilion);
  transform: scaleX(0); transform-origin: right;
  transition: transform .3s var(--ease);
}
.footer-link:hover { color: var(--vermilion); }
.footer-link:hover::after { transform: scaleX(1); transform-origin: left; }

.footer-sub { display: flex; align-items: center; gap: 10px; }
.sub-input {
  border: 1px solid var(--border-strong); background: transparent;
  border-radius: 10px; padding: 9px 15px;
  font-family: var(--font-body); font-size: 13px; color: var(--text);
  outline: none; width: 215px;
  transition: border-color .25s, box-shadow .25s;
}
.sub-input:focus { border-color: var(--vermilion); box-shadow: 0 0 0 3px var(--vermilion-glow); }
.sub-input::placeholder { color: var(--text-tertiary); }
.sub-btn {
  border: none; background: var(--text); color: var(--bg);
  font-family: var(--font-body); font-size: 13px; font-weight: 500;
  padding: 10px 20px; border-radius: 10px; cursor: pointer;
  transition: opacity .25s, transform .25s var(--ease);
}
.sub-btn:hover { opacity: .86; }
.sub-btn:active { transform: scale(.96); }
.lead-success {
  max-width: 1200px; margin: 14px auto 0;
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: #2E9E5B;
}

/* ---------- 开发者接入弹窗 ---------- */
.dev-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(12,12,12,.5);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity .3s var(--ease);
}
.dev-overlay.active { opacity: 1; }
.dev-modal {
  width: 100%; max-width: 560px;
  background: var(--bg-surface);
  border-radius: 18px;
  padding: 26px 28px;
  box-shadow: 0 2px 6px rgba(0,0,0,.08), 0 24px 72px rgba(0,0,0,.18);
  transform: translateY(12px);
  transition: transform .3s var(--ease);
}
.dev-overlay.active .dev-modal { transform: none; }
.dev-modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.dev-modal-header h3 { font-family: var(--font-serif-cn); font-weight: 700; font-size: 18px; letter-spacing: .05em; color: var(--text); }
.dev-modal-close {
  width: 32px; height: 32px;
  border: none; border-radius: 8px;
  background: transparent; color: var(--text-secondary);
  font-size: 20px; line-height: 1;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.dev-modal-close:hover { background: var(--vermilion-glow); color: var(--vermilion); }
.dev-modal-desc { font-size: 13.5px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 18px; }
.dev-row { margin-bottom: 14px; }
.dev-row:last-child { margin-bottom: 0; }
.dev-row-label {
  font-size: 11px; font-weight: 600;
  letter-spacing: .14em;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}
.dev-endpoint-row {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
}
.dev-endpoint {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--vermilion);
  word-break: break-all;
  white-space: normal;
}
.dev-usage { display: none; }
.mcp-copy-btn {
  flex-shrink: 0;
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--border-strong); border-radius: 8px;
  background: transparent; color: var(--text-secondary);
  font-family: var(--font-body); font-size: 12px;
  padding: 7px 12px; cursor: pointer;
  transition: all .2s;
}
.mcp-copy-btn:hover { border-color: var(--vermilion); color: var(--vermilion); background: var(--vermilion-glow); }
.mcp-copy-btn svg { width: 13px; height: 13px; }
.mcp-copy-btn.is-copied { border-color: #2E9E5B; color: #2E9E5B; }

/* ---------- 入场编排 ---------- */
.reveal { opacity: 0; transform: translateY(20px); }
.reveal.animate-in { opacity: 1; transform: none; transition: opacity .9s var(--ease) var(--del, 0s), transform .9s var(--ease) var(--del, 0s); }

/* ---------- 首页响应式 ---------- */
@media (max-width: 900px) {
  .module-row { grid-template-columns: repeat(2, 1fr); }
  .module-item:nth-child(2n) { border-right: none; }
  .module-desc { max-height: 90px; opacity: 1; }
  .agents-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .fc { display: none; }
  .hero { padding-top: 92px; }
}
@media (max-width: 560px) {
  .bg-watermark { font-size: 260px; }
  .module-row { grid-template-columns: 1fr; }
  .module-item { border-right: none; }
  .agents-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .ask-toolbar { flex-wrap: wrap; gap: 10px; }
  .footer-sub { width: 100%; }
  .sub-input { flex: 1; width: auto; }
  .hero-proof { flex-wrap: wrap; justify-content: center; gap: 10px; }
  .hero-proof .sep { display: none; }
  .nav-cta { display: none; }
}

/* ---------- 减弱动效（首页） ---------- */
@media (prefers-reduced-motion: reduce) {
  .bg *, .hero *, .agents *, .modules *, .quote *, .footer * {
    animation-duration: .01s !important;
    transition-duration: .01s !important;
  }
}


/* ============================================================
   V12.1 首页设计师精修
   ============================================================ */

/* 引言区：装饰性大引号 */
.quote { position: relative; }
.quote::before {
  content: '“';
  position: absolute;
  top: 30px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-serif-cn);
  font-size: 180px; line-height: 1;
  color: var(--vermilion);
  opacity: .06;
  pointer-events: none;
  user-select: none;
}

/* 提问框：细腻的顶部高光 */
.hero .ask {
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-surface) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.6),
    0 2px 6px rgba(0,0,0,.05),
    0 18px 56px rgba(0,0,0,.1);
}
[data-theme="dark"] .hero .ask {
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.04),
    0 2px 6px rgba(0,0,0,.35),
    0 18px 56px rgba(0,0,0,.5);
}
.hero .ask:focus-within {
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.6),
    0 0 0 5px var(--vermilion-glow),
    0 2px 6px rgba(0,0,0,.05),
    0 18px 56px rgba(0,0,0,.1);
}
[data-theme="dark"] .hero .ask:focus-within {
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.04),
    0 0 0 5px var(--vermilion-glow),
    0 2px 6px rgba(0,0,0,.35),
    0 18px 56px rgba(0,0,0,.5);
}

/* 印章：极缓的呼吸 */
.seal { animation: hmSealBreath 5s ease-in-out infinite; }
@keyframes hmSealBreath {
  0%, 100% { box-shadow: 0 2px 10px rgba(196,30,58,.28), inset 0 0 0 1.5px rgba(255,255,255,.22); }
  50% { box-shadow: 0 4px 18px rgba(196,30,58,.4), inset 0 0 0 1.5px rgba(255,255,255,.3); }
}

/* 智能体卡片：hover 时描述文字提亮 */
.agent-card p { transition: color .3s; }
.agent-card:hover p { color: var(--text); }

/* 模块条：hover 时名称轻微位移 */
.module-name { transition: transform .35s var(--ease); }
.module-item:hover .module-name { transform: translateX(3px); }

/* 锚点滚动留出导航高度 */
.home-section { scroll-margin-top: 80px; }

/* chips 键盘焦点 */
.chip:focus-visible, .footer-link:focus-visible, .agent-card:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
}

/* 导航滚动后加发丝线（JS boxShadow 的替代，更细腻） */
.navbar { transition: border-color .3s, background .3s; border-bottom: 1px solid transparent; }
.navbar.scrolled { border-bottom-color: var(--border); background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }

/* 开发者弹窗：标题下加发丝线 */
.dev-modal-header { padding-bottom: 12px; border-bottom: 1px solid var(--border); margin-bottom: 14px; }

/* 移动端弹窗适配 */
@media (max-width: 560px) {
  .dev-modal { padding: 22px 20px; border-radius: 16px; }
  .dev-endpoint { font-size: 11px; }
  .quote::before { font-size: 120px; top: 40px; }
}

/* 模块条 3 列变体（真实知识分类） */
.module-row-3 { grid-template-columns: repeat(3, 1fr); }
.module-row-3 .module-num {
  color: var(--vermilion);
  font-weight: 600;
  opacity: .85;
}
@media (max-width: 900px) {
  .module-row-3 { grid-template-columns: 1fr; }
  .module-row-3 .module-item { border-right: none; }
}


/* ============================================================
   V12.2 无障碍焦点 + 暗色补充
   ============================================================ */

/* 焦点可见性（键盘导航） */
.ghost-btn:focus-visible,
.nav-cta:focus-visible,
.sub-btn:focus-visible,
.c-send:focus-visible,
.c-tool:focus-visible,
.mode-btn:focus-visible,
.answer-mode-btn:focus-visible,
.c-fu-chip:focus-visible,
.c-starter:focus-visible,
.sources-toggle:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
  border-radius: 4px;
}
.chip:focus-visible,
.footer-link:focus-visible,
.agent-card:focus-visible,
.module-item:focus-visible,
.ct-btn:focus-visible,
.nav-btn:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
}

/* 暗色模式补充覆盖（微调对比度） */
[data-theme="dark"] .agent-card {
  border-color: rgba(241,239,232,.08);
  background: var(--bg-surface);
}
[data-theme="dark"] .agent-card:hover {
  background: rgba(241,239,232,.04);
}
[data-theme="dark"] .c-starter {
  background: var(--bg-surface);
  border-color: var(--border-strong);
}
[data-theme="dark"] .c-starter:hover {
  background: var(--acc-soft);
}
[data-theme="dark"] .sub-input {
  background: var(--bg-surface);
}
[data-theme="dark"] .dev-modal {
  background: var(--bg-surface);
}
[data-theme="dark"] .dev-endpoint-row {
  background: var(--bg);
}
[data-theme="dark"] .c-loading {
  background: var(--bg-surface);
  border-color: var(--border);
}
[data-theme="dark"] .c-thinking {
  background: var(--bg-surface);
  border-color: var(--border);
}
[data-theme="dark"] .footer {
  background: var(--bg-surface);
  border-color: var(--border);
}
[data-theme="dark"] .source-card {
  background: var(--bg-surface);
  border-color: var(--border);
}
[data-theme="dark"] .source-card:hover {
  background: var(--bg-elevated);
}
[data-theme="dark"] .c-fu-chip {
  background: var(--bg-surface);
  border-color: var(--border);
}
[data-theme="dark"] .c-fu-chip:hover {
  background: var(--acc-soft);
  border-color: var(--acc);
}

/* 暗色下首页水印和浮字微调 */
[data-theme="dark"] .bg-watermark {
  -webkit-text-stroke-color: rgba(241,239,232,.06);
  opacity: .35;
}
[data-theme="dark"] .bg-glow {
  opacity: .25;
}

/* 暗色下导航底色 */
[data-theme="dark"] .chat-topbar {
  background: var(--bg-surface);
  border-color: var(--border);
}