/* ============================================
   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);

  /* 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;
  --text: #F5F3EE;
  --text-secondary: #8A8A82;
  --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;
  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-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.kb-explore-item {
  padding: 12px 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: 14px;
  margin-bottom: 4px;
}

.kb-explore-item-meta {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  gap: 12px;
}

.kb-explore-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--vermilion-glow);
  color: var(--vermilion);
  font-size: 11px;
  border-radius: 2px;
  margin-right: 4px;
}

.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 {
  display: block;
  font-size: 11.5px;
  padding: 6px 10px;
  background: var(--vermilion-glow);
  border: 1px solid rgba(196,30,58,0.12);
  border-radius: 6px;
  color: var(--vermilion);
  font-family: 'SF Mono', 'Fira Code', monospace;
  word-break: break-all;
  user-select: all;
}

/* ============ 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);
}

/* 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 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--ink-faint);
  margin-bottom: var(--space-sm);
}

.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);
}

/* Toast notification */
.smart-toast {
  position: fixed;
  bottom: 80px;
  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;
  }
  .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;
  }
}