:root {
  --color-ink: #1A2A3A;
  --color-warm-gray: #2C2C2C;
  --color-amber: #D4A04A;
  --color-warm-orange: #E67E22;
  --color-parchment: #F8F5F0;
  --color-blue-gray: #6B7B8D;
  --color-white: #FFFFFF;
  --color-deep: #0F1A24;
  --color-soft-border: rgba(26, 42, 58, 0.08);
  --color-card-bg: #FFFFFF;
  --color-card-bg-dark: rgba(255, 255, 255, 0.06);
  --color-text-primary: #1A2A3A;
  --color-text-secondary: #6B7B8D;
  --color-text-inverse: #F8F5F0;
  --color-text-inverse-muted: rgba(248, 245, 240, 0.65);
  --color-gradient-amber: linear-gradient(135deg, #D4A04A 0%, #E67E22 100%);
  --color-gradient-warm: linear-gradient(180deg, #F8F5F0 0%, #F0EBE3 100%);
  --color-gradient-deep: linear-gradient(180deg, #1A2A3A 0%, #0F1A24 100%);

  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(26, 42, 58, 0.06), 0 1px 2px rgba(26, 42, 58, 0.04);
  --shadow-md: 0 4px 12px rgba(26, 42, 58, 0.08), 0 2px 4px rgba(26, 42, 58, 0.04);
  --shadow-lg: 0 12px 32px rgba(26, 42, 58, 0.12), 0 4px 8px rgba(26, 42, 58, 0.06);
  --shadow-card: 0 2px 12px rgba(26, 42, 58, 0.06);
  --shadow-card-hover: 0 12px 40px rgba(26, 42, 58, 0.12);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --container-max: 1200px;
  --container-padding: 32px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-parchment);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s var(--ease-smooth);
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: all 0.3s var(--ease-smooth);
  cursor: pointer;
  white-space: nowrap;
}

.btn-sm {
  padding: 10px 22px;
  font-size: 14px;
  border-radius: var(--radius-sm);
}

.btn-primary {
  background: var(--color-gradient-amber);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(212, 160, 74, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(212, 160, 74, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border: 1.5px solid var(--color-ink);
}

.btn-outline:hover {
  background: var(--color-ink);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* ============ SiteHeader ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  background: transparent;
  transition: all 0.4s var(--ease-smooth);
}

.site-header.scrolled {
  background: rgba(248, 245, 240, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  padding: 14px 0;
  border-bottom: 1px solid var(--color-soft-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-cn {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-ink);
}

.brand-en {
  font-family: var(--font-serif);
  font-size: 14px;
  font-style: italic;
  color: var(--color-blue-gray);
}

.nav-links {
  display: flex;
  gap: 40px;
}

.nav-link {
  font-size: 15px;
  color: var(--color-ink);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gradient-amber);
  transition: width 0.3s var(--ease-smooth);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link:hover {
  color: var(--color-warm-orange);
}

/* ============ HeroSection ============ */
.hero {
  min-height: 100vh;
  position: relative;
  padding: 140px 0 80px;
  background: var(--color-parchment);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg-texture {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(212, 160, 74, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(107, 123, 141, 0.06) 0%, transparent 50%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231A2A3A' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 560px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-ink);
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-blue-gray);
  margin-bottom: 40px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-links {
  display: flex;
  gap: 28px;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-blue-gray);
  transition: color 0.2s var(--ease-smooth);
}

.hero-link:hover {
  color: var(--color-amber);
}

.hero-link svg {
  opacity: 0.7;
}

.hero-mockup {
  display: flex;
  justify-content: center;
  align-items: center;
}

.float-animation {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.mockup-window {
  width: 100%;
  max-width: 480px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-soft-border);
}

.mockup-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: #FAFAF7;
  border-bottom: 1px solid var(--color-soft-border);
}

.mockup-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #FF5F56; }
.dot-yellow { background: #FFBD2E; }
.dot-green { background: #27C93F; }

.mockup-title {
  margin-left: 12px;
  font-size: 13px;
  color: var(--color-blue-gray);
  font-family: var(--font-mono);
}

.mockup-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mockup-passage p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-primary);
  font-style: italic;
  border-left: 3px solid var(--color-amber);
  padding-left: 16px;
}

.mockup-question,
.mockup-answer {
  display: flex;
  gap: 8px;
  font-size: 14px;
  line-height: 1.7;
}

.q-label {
  color: var(--color-blue-gray);
  flex-shrink: 0;
}

.q-text {
  color: var(--color-text-primary);
}

.a-label {
  color: var(--color-warm-orange);
  font-weight: 600;
  flex-shrink: 0;
}

.a-text {
  color: var(--color-text-primary);
}

.a-text mark {
  background: linear-gradient(180deg, transparent 50%, rgba(212, 160, 74, 0.3) 50%);
  color: inherit;
  padding: 0 2px;
}

.mockup-citation {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(212, 160, 74, 0.08);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

.cite-tag {
  display: inline-flex;
  padding: 2px 8px;
  background: var(--color-gradient-amber);
  color: white;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.cite-text {
  color: var(--color-blue-gray);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--color-blue-gray);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-scroll-hint span:first-child {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--color-blue-gray));
  animation: scrollHint 2s ease-in-out infinite;
}

@keyframes scrollHint {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ============ Section Common ============ */
.section {
  padding: var(--space-10) 0;
}

.section-eyebrow {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-warm-orange);
  font-weight: 600;
  margin-bottom: 16px;
}

.section-eyebrow.eyebrow-light {
  color: var(--color-amber);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
  margin-bottom: 64px;
  max-width: 800px;
}

.section-title.title-light {
  color: var(--color-text-inverse);
}

/* ============ ProductOverview ============ */
.section-overview {
  background: var(--color-parchment);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.cap-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-card);
  transition: all 0.4s var(--ease-smooth);
  border: 1px solid var(--color-soft-border);
}

.cap-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.cap-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--color-gradient-amber);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  margin-bottom: 24px;
}

.cap-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.cap-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-blue-gray);
}

/* ============ ReadingWorkflow ============ */
.section-workflow {
  background: var(--color-gradient-warm);
}

.workflow-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  justify-content: space-between;
}

.wf-step {
  flex: 1;
  text-align: center;
  padding: 0 24px;
  position: relative;
}

.wf-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-gradient-amber);
  color: var(--color-white);
  font-weight: 700;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(212, 160, 74, 0.3);
}

.wf-icon {
  color: var(--color-ink);
  margin-bottom: 16px;
}

.wf-step h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.wf-step p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-blue-gray);
  max-width: 220px;
  margin: 0 auto;
}

.wf-connector {
  width: 40px;
  height: 2px;
  background: linear-gradient(to right, var(--color-amber), var(--color-warm-orange));
  margin-top: 56px;
  flex-shrink: 0;
  position: relative;
}

.wf-connector::after {
  content: '';
  position: absolute;
  right: -2px;
  top: -3px;
  width: 0;
  height: 0;
  border-left: 8px solid var(--color-warm-orange);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
}

/* ============ ProductTour ============ */
.section-tour {
  background: var(--color-parchment);
}

.tour-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.tour-steps {
  position: sticky;
  top: 120px;
}

.tour-step {
  display: flex;
  gap: 20px;
  padding: 20px;
  border-radius: var(--radius-md);
  transition: all 0.4s var(--ease-smooth);
  cursor: pointer;
  margin-bottom: 8px;
  opacity: 0.5;
}

.tour-step.active {
  opacity: 1;
  background: var(--color-card-bg);
  box-shadow: var(--shadow-md);
}

.tour-num {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-amber);
  min-width: 48px;
  line-height: 1;
}

.tour-content h4 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.tour-content p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-blue-gray);
}

.tour-mockup {
  position: sticky;
  top: 120px;
}

.tour-mockup-window {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-soft-border);
  overflow: hidden;
  height: 520px;
  position: relative;
}

.tm-stage {
  position: relative;
  height: 100%;
}

.tm-layer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 24px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.5s var(--ease-smooth);
  pointer-events: none;
}

.tm-layer.active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.tm-reader {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tm-page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-soft-border);
}

.tm-chapter {
  font-weight: 600;
  color: var(--color-ink);
}

.tm-progress {
  font-size: 13px;
  color: var(--color-blue-gray);
  font-family: var(--font-mono);
}

.tm-text p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-text-primary);
  margin-bottom: 12px;
}

.tm-highlight {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.highlight-bar {
  display: block;
  width: 100%;
  height: 48px;
  background: linear-gradient(90deg, rgba(212, 160, 74, 0.25) 0%, rgba(212, 160, 74, 0.15) 100%);
  border-radius: var(--radius-sm);
  position: relative;
}

.highlight-text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-primary);
  font-style: italic;
  padding: 10px 14px;
  background: rgba(212, 160, 74, 0.1);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-amber);
}

.ask-bubble {
  align-self: flex-end;
  background: var(--color-gradient-amber);
  color: white;
  padding: 10px 18px;
  border-radius: 18px 18px 4px 18px;
  font-size: 14px;
  max-width: 80%;
}

.tm-answer-box {
  background: #FAFAF7;
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--color-soft-border);
}

.tm-answer-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.ai-avatar {
  width: 28px;
  height: 28px;
  background: var(--color-gradient-amber);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}

.tm-answer-box p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-primary);
}

.tm-citation-card {
  background: rgba(212, 160, 74, 0.08);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  gap: 16px;
  border-left: 4px solid var(--color-amber);
}

.tm-cite-mark {
  display: inline-flex;
  padding: 4px 10px;
  background: var(--color-gradient-amber);
  color: white;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  height: fit-content;
}

.tm-cite-content {
  flex: 1;
}

.cite-loc {
  font-size: 12px;
  color: var(--color-blue-gray);
  font-family: var(--font-mono);
}

.cite-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-primary);
  font-style: italic;
  margin-top: 4px;
}

.tm-jump-flash {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.flash-ring {
  width: 120px;
  height: 120px;
  border: 3px solid var(--color-amber);
  border-radius: 50%;
  animation: flashRing 1.5s ease-out infinite;
}

.flash-target {
  position: absolute;
  background: var(--color-ink);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 14px;
}

@keyframes flashRing {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(1.5); opacity: 0; }
}

.tm-graph {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.tm-graph svg {
  width: 100%;
  height: 100%;
  max-height: 420px;
}

.graph-node {
  fill: var(--color-amber);
  opacity: 0.85;
}

.graph-node.core {
  fill: var(--color-warm-orange);
  opacity: 1;
}

.graph-edge {
  stroke: var(--color-blue-gray);
  stroke-width: 1.5;
  opacity: 0.4;
}

.graph-label {
  fill: var(--color-ink);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-sans);
}

.graph-label-sm {
  fill: var(--color-blue-gray);
  font-size: 10px;
  font-family: var(--font-sans);
}

.tm-return {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.return-hint {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  background: var(--color-parchment);
  border-radius: var(--radius-lg);
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 500;
}

/* ============ EvidenceBoundary ============ */
.section-evidence {
  background: var(--color-gradient-deep);
  position: relative;
  overflow: hidden;
}

.section-evidence::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(212, 160, 74, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(230, 126, 34, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.section-evidence .section-title {
  color: var(--color-text-inverse);
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  position: relative;
}

.evidence-card {
  background: var(--color-card-bg-dark);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(248, 245, 240, 0.1);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all 0.4s var(--ease-smooth);
}

.evidence-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(212, 160, 74, 0.3);
  transform: translateY(-4px);
}

.evi-icon {
  color: var(--color-amber);
  margin-bottom: 24px;
}

.evidence-card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-text-inverse);
  margin-bottom: 12px;
}

.evi-tagline {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-amber);
  margin-bottom: 12px;
  line-height: 1.6;
}

.evi-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-inverse-muted);
}

.evi-reject-demo {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(248, 245, 240, 0.1);
}

.reject-bubble {
  background: rgba(248, 245, 240, 0.08);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
}

.reject-label {
  color: var(--color-warm-orange);
  font-weight: 600;
  flex-shrink: 0;
}

.reject-text {
  color: var(--color-text-inverse-muted);
}

/* ============ UseCases ============ */
.section-usecases {
  background: var(--color-parchment);
}

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.usecase-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-soft-border);
  transition: all 0.4s var(--ease-smooth);
  cursor: pointer;
}

.usecase-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(212, 160, 74, 0.4);
}

.uc-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(212, 160, 74, 0.15) 0%, rgba(230, 126, 34, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-warm-orange);
  margin-bottom: 20px;
}

.usecase-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.usecase-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-blue-gray);
}

/* ============ ProductDifference ============ */
.section-difference {
  background: var(--color-gradient-warm);
}

.difference-table {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  border: 1px solid var(--color-soft-border);
}

.diff-row {
  display: grid;
  grid-template-columns: 1fr 40px 1fr;
  align-items: center;
  border-bottom: 1px solid var(--color-soft-border);
  min-height: 72px;
  transition: background 0.2s var(--ease-smooth);
}

.diff-row:last-child {
  border-bottom: none;
}

.diff-row:hover:not(.diff-header) {
  background: rgba(212, 160, 74, 0.05);
}

.diff-header {
  background: var(--color-gradient-deep);
}

.diff-header .diff-col {
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: 15px;
}

.diff-col {
  padding: 20px 28px;
  font-size: 15px;
  color: var(--color-text-primary);
  line-height: 1.6;
}

.diff-col-old {
  color: var(--color-blue-gray);
  text-decoration: line-through;
  text-decoration-color: rgba(107, 123, 141, 0.4);
}

.diff-col-new {
  color: var(--color-ink);
  font-weight: 500;
  position: relative;
}

.diff-col-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-amber);
}

.diff-col-arrow svg {
  transition: transform 0.3s var(--ease-smooth);
}

.diff-row:hover .diff-col-arrow svg {
  transform: translateX(4px);
}

.diff-summary {
  text-align: center;
  margin-top: 40px;
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-ink);
  font-style: italic;
}

/* ============ PageragExplanation ============ */
.section-pagerag {
  background: var(--color-parchment);
}

.pagerag-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pagerag-step {
  display: grid;
  grid-template-columns: 60px 80px 1fr;
  gap: 32px;
  align-items: flex-start;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-soft-border);
  transition: all 0.3s var(--ease-smooth);
}

.pagerag-step:last-child {
  border-bottom: none;
}

.pagerag-step:hover {
  background: rgba(212, 160, 74, 0.04);
  border-radius: var(--radius-md);
  padding-left: 20px;
  padding-right: 20px;
}

.pg-step-num {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  color: var(--color-amber);
  line-height: 1;
  opacity: 0.6;
}

.pg-step-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-gradient-amber);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s var(--ease-smooth);
}

.pagerag-step:hover .pg-step-icon {
  transform: scale(1.1);
}

.pg-step-body h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.pg-step-body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-blue-gray);
  max-width: 600px;
}

.pagerag-summary {
  margin-top: 48px;
  padding: 32px;
  background: var(--color-gradient-amber);
  border-radius: var(--radius-lg);
  color: var(--color-white);
  font-size: 17px;
  line-height: 1.8;
  text-align: center;
}

.pagerag-summary strong {
  font-weight: 700;
}

/* ============ ResearchSection ============ */
.section-research {
  background: linear-gradient(180deg, #F0EBE3 0%, #F8F5F0 100%);
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.research-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-warm-orange);
  font-weight: 600;
  margin-bottom: 16px;
}

.research-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-primary);
}

.metrics-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.metric-item {
  display: grid;
  grid-template-columns: 80px 1fr 48px;
  align-items: center;
  gap: 16px;
}

.metric-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
}

.metric-bar {
  height: 8px;
  background: rgba(26, 42, 58, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.metric-fill {
  display: block;
  height: 100%;
  background: var(--color-gradient-amber);
  border-radius: 4px;
  width: 0;
  transition: width 1.2s var(--ease-out);
}

.metric-val {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  font-family: var(--font-mono);
}

.metric-note {
  margin-top: 20px;
  font-size: 12px;
  color: var(--color-blue-gray);
  font-style: italic;
}

.research-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.research-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px;
  background: var(--color-card-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-soft-border);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  transition: all 0.3s var(--ease-smooth);
}

.research-link:hover {
  border-color: var(--color-amber);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.research-link svg {
  color: var(--color-amber);
  flex-shrink: 0;
}

.research-link span:nth-child(2) {
  flex: 1;
}

.link-arrow {
  color: var(--color-blue-gray);
  transition: transform 0.3s var(--ease-smooth);
}

.research-link:hover .link-arrow {
  transform: translateX(4px);
  color: var(--color-amber);
}

/* ============ SiteFooter ============ */
.site-footer {
  background: var(--color-gradient-deep);
  padding: 72px 0 48px;
  color: var(--color-text-inverse);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-brand-cn {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
}

.footer-brand-en {
  font-family: var(--font-serif);
  font-size: 14px;
  font-style: italic;
  color: var(--color-text-inverse-muted);
}

.footer-copy {
  font-size: 12px;
  color: var(--color-text-inverse-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.footer-links a {
  color: var(--color-text-inverse-muted);
  transition: color 0.2s var(--ease-smooth);
}

.footer-links a:hover {
  color: var(--color-amber);
}

.footer-sep {
  color: rgba(248, 245, 240, 0.2);
}

.footer-cta .btn {
  background: var(--color-gradient-amber);
}

/* ============ Reveal Animation ============ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  :root {
    --container-padding: 24px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-title {
    font-size: 44px;
  }

  .hero-mockup {
    order: -1;
  }

  .tour-layout {
    grid-template-columns: 1fr;
  }

  .tour-steps,
  .tour-mockup {
    position: static;
  }

  .tour-mockup-window {
    height: 420px;
  }

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

  .usecases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .research-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .workflow-steps {
    flex-wrap: wrap;
    gap: 32px;
  }

  .wf-step {
    flex: 0 0 calc(50% - 16px);
  }

  .wf-connector {
    display: none;
  }

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

@media (max-width: 768px) {
  :root {
    --container-padding: 20px;
    --space-10: 72px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .section-title {
    font-size: 28px;
    margin-bottom: 40px;
  }

  .wf-step {
    flex: 0 0 100%;
  }

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

  .diff-row {
    grid-template-columns: 1fr 28px 1fr;
  }

  .diff-col {
    padding: 14px 16px;
    font-size: 13px;
  }

  .pagerag-step {
    grid-template-columns: 40px 60px 1fr;
    gap: 20px;
  }

  .pg-step-num {
    font-size: 36px;
  }

  .pg-step-icon {
    width: 56px;
    height: 56px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .metric-item {
    grid-template-columns: 60px 1fr 40px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 30px;
  }

  .hero-links {
    flex-direction: column;
    gap: 12px;
  }

  .cap-card,
  .usecase-card {
    padding: 28px 24px;
  }
}