/* =============================================
   WorldAgents Research Paper Website
   ============================================= */

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

:root {
  --bg: #060810;
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  --radius-sm: 8px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
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  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* =============================================
   Background Elements
   ============================================= */

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
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.bg-gradient-orb {
  position: fixed;
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.orb-1 {
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  background: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, transparent 70%);
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/* =============================================
   Layout
   ============================================= */

.container {
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  padding: 0 24px;
}

.container-narrow {
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}

/* =============================================
   Navbar
   ============================================= */

.navbar {
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  right: 0;
  z-index: 100;
  padding: 0 24px;
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.nav-links {
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}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}

.nav-link.active {
  color: var(--accent-bright);
  background: rgba(99, 102, 241, 0.1);
}

@media (max-width: 768px) {
  .nav-inner { height: auto; padding: 8px 0; flex-wrap: wrap; justify-content: center; gap: 4px; }
  .nav-brand { display: none; }
  .nav-links { flex-wrap: wrap; justify-content: center; gap: 2px; }
  .nav-link { padding: 5px 10px; font-size: 12px; }
}

/* =============================================
   Hero
   ============================================= */

.hero {
  padding: 100px 0 60px;
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.hero > * {
  position: relative;
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.badge-row {
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  gap: 10px;
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  margin-bottom: 32px;
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.badge {
  display: inline-flex;
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  padding: 6px 16px;
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.title {
  font-family: var(--font-display);
  font-size: clamp(56px, 8vw, 96px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -2px;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.title-accent {
  background: linear-gradient(135deg, var(--accent-bright) 0%, var(--accent2) 50%, var(--accent3) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: clamp(18px, 2.8vw, 26px);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.5;
}

.hide-sm { display: none; }
@media (min-width: 600px) { .hide-sm { display: initial; } }

/* Authors */
.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 4px 0;
  margin-bottom: 12px;
}

.author {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 20px;
  font-weight: 500;
  transition: color var(--transition);
}

.author:hover { color: var(--accent-bright); }
.author sup { font-size: 11px; color: var(--accent-bright); margin-left: 1px; }

.sep {
  margin: 0 10px;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.affiliations {
  color: var(--text-muted);
  font-size: 17px;
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.affiliation-logo {
  height: 20px;
  max-height: 20px;
  width: auto;
  max-width: 120px;
  opacity: 0.65;
  vertical-align: middle;
  display: inline-block;
  flex-shrink: 0;
}


.aff-sep {
  margin: 0 10px;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--border);
}

/* =============================================
   Teaser Section
   ============================================= */

.video-section {
  padding: 20px 0 60px;
  position: relative;
  z-index: 1;
}

.video-section .section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.video-section .section-title::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
}

.video-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.teaser-section {
  padding: 40px 0 80px;
  position: relative;
  z-index: 1;
}

.teaser-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255,255,255,0.05);
}

.teaser-svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  background: #111827;
  margin-bottom: 24px;
  filter: brightness(0.82);
}

.teaser-caption {
  text-align: center;
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.7;
}

/* =============================================
   Main Content Sections
   ============================================= */

.main-content {
  position: relative;
  z-index: 1;
  padding-bottom: 80px;
}

.section {
  margin-bottom: 80px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
}

/* =============================================
   Abstract
   ============================================= */

.abstract-text p {
  color: var(--text-secondary);
  font-size: 17px;
  margin-bottom: 20px;
  line-height: 1.9;
}

.abstract-text p:last-child { margin-bottom: 0; }

.abstract-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* =============================================
   Metrics Grid
   ============================================= */

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}

.metric-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--accent-glow);
}

.metric-value {
  font-size: 42px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-bright), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}

.metric-label {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* =============================================
   Overview Figure
   ============================================= */

.overview-figure {
  margin-bottom: 48px;
}

.overview-svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #1e2a3a;
  display: block;
  filter: brightness(0.82);
}

.figure-caption {
  margin-top: 14px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  text-align: center;
  padding: 0 16px;
}

.figure-caption strong {
  color: var(--text-secondary);
}

/* =============================================
   Method Steps
   ============================================= */

.method-steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.method-step {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  backdrop-filter: blur(8px);
  transition: all var(--transition);
}

.method-step:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 500;
  color: var(--accent);
  opacity: 0.5;
  min-width: 56px;
  line-height: 1;
  margin-top: 4px;
}

.step-mascot {
  flex-shrink: 0;
  width: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-mascot img {
  width: 90px;
  height: 90px;
  object-fit: contain;
  background: white;
  border-radius: 50%;
  padding: 10px;
  filter: brightness(0.75) drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}

.step-mascot-3dgs {
  font-size: 48px;
  line-height: 1;
  width: 90px;
  height: 90px;
  background: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: brightness(0.75) drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}

.step-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.step-content p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

/* =============================================
   Results Table
   ============================================= */

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  margin-bottom: 16px;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.results-table thead {
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}

.results-table th {
  padding: 16px 24px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.results-table th:not(:first-child) {
  text-align: center;
}

.results-table td {
  padding: 16px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-secondary);
}

.results-table td:not(:first-child) {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 14px;
}

.results-table tbody tr:last-child td {
  border-bottom: none;
}

.results-table tbody tr:hover td {
  background: rgba(255,255,255,0.02);
}

.highlight-row td {
  background: rgba(99, 102, 241, 0.07) !important;
  color: var(--text-primary) !important;
}

.highlight-row:hover td {
  background: rgba(99, 102, 241, 0.12) !important;
}

.method-name { font-weight: 500; }

.ref {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
}

.table-note {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}

/* =============================================
   Demo Grid
   ============================================= */

.comparison-block {
  margin-bottom: 48px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

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

.comparison-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.comparison-label {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(0,0,0,0.55);
  color: var(--text-secondary);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.1);
}

.comparison-label-ours {
  background: rgba(99, 102, 241, 0.5);
  color: white;
  border-color: rgba(99, 102, 241, 0.6);
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}


.demo-video {
  width: 100%;
  display: block;
  border-radius: var(--radius) var(--radius) 0 0;
  background: #000;
}

.demo-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: all var(--transition);
}

.demo-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
}

.demo-preview {
  position: relative;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  overflow: hidden;
}

.demo-preview-1 {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #1e3a5f 100%);
}

.demo-preview-2 {
  background: linear-gradient(135deg, #064e3b 0%, #065f46 50%, #134e4a 100%);
}

.demo-preview-3 {
  background: linear-gradient(135deg, #3b0764 0%, #4c1d95 50%, #2e1065 100%);
}

.demo-play-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  backdrop-filter: blur(8px);
  transition: all var(--transition);
  border: 1px solid rgba(255,255,255,0.2);
}

.demo-preview:hover .demo-play-btn {
  background: rgba(255,255,255,0.25);
  transform: scale(1.1);
}

.demo-label-overlay {
  position: absolute;
  bottom: 12px;
  left: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.7);
  background: rgba(0,0,0,0.4);
  padding: 4px 10px;
  border-radius: 100px;
  backdrop-filter: blur(4px);
}

.demo-caption {
  padding: 16px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* =============================================
   Foundation Models
   ============================================= */

.models-subheading {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subheading-mascot {
  width: 36px;
  height: 36px;
  object-fit: contain;
  background: white;
  border-radius: 50%;
  padding: 3px;
  filter: brightness(0.75) drop-shadow(0 2px 6px rgba(0,0,0,0.3));
}

.models-subheading:first-of-type {
  margin-top: 0;
}

.models-intro {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.model-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(8px);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.model-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, #1a1a1a, #555, #1a1a1a);
}

.model-card-bfl::before {
  background: linear-gradient(90deg, #e2e8f0, #94a3b8, #e2e8f0);
}

.model-card-bfl {
  border-color: rgba(148, 163, 184, 0.2);
}

.model-card-gemini::before {
  background: linear-gradient(90deg, #4285f4, #a259ff, #ea4335);
}

.model-card-openai::before {
  background: linear-gradient(90deg, #10a37f, #1a7f64, #10a37f);
}

.model-card-qwen::before {
  background: linear-gradient(90deg, #5f3dc4, #845ef7, #5f3dc4);
}

.model-card:hover {
  border-color: rgba(255,255,255,0.15);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
}

.model-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.model-logo {
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  line-height: 0;
}

.model-title-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.model-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

.model-variant {
  color: var(--accent-bright);
}

.model-maker {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.model-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  flex: 1;
}

.model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-muted);
}

.tag-gemini {
  background: rgba(66, 133, 244, 0.1);
  border-color: rgba(66, 133, 244, 0.25);
  color: #7ab3f8;
}

.tag-bfl {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  color: #e2e8f0;
}

.tag-generator {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.25);
  color: #fbbf24;
}

.tag-openai {
  background: rgba(16, 163, 127, 0.1);
  border-color: rgba(16, 163, 127, 0.25);
  color: #34d399;
}

.tag-qwen {
  background: rgba(95, 61, 196, 0.12);
  border-color: rgba(132, 94, 247, 0.3);
  color: #a78bfa;
}

.model-variant-qwen {
  color: #a78bfa;
}

/* =============================================
   BibTeX
   ============================================= */

.bibtex-block {
  position: relative;
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.bibtex-block pre {
  padding: 32px;
  overflow-x: auto;
}

.bibtex-block code {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
  color: #c9d1d9;
}

.copy-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.copy-btn:hover {
  background: rgba(255,255,255,0.12);
  color: var(--text-primary);
}

.copy-btn.copied {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.4);
  color: var(--success);
}

/* =============================================
   Footer
   ============================================= */

.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 48px 0;
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.footer a {
  color: var(--accent-bright);
  text-decoration: none;
}

.footer a:hover { text-decoration: underline; }
.footer-sub { font-size: 13px; color: var(--text-muted); opacity: 0.6; }

/* =============================================
   Custom Cursor
   ============================================= */


/* =============================================
   Scan Line Dividers
   ============================================= */

.scan-divider {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 28px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.scan-track {
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
  position: relative;
  overflow: hidden;
  border-radius: 1px;
}

.scan-beam {
  position: absolute;
  top: -1px;
  left: -60%;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent2), var(--accent), transparent);
  border-radius: 2px;
  opacity: 0;
  filter: blur(1px);
  transition: none;
}

.scan-divider.scanning .scan-beam {
  animation: scanSweep 1.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes scanSweep {
  0%   { left: -60%; opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { left: 110%; opacity: 0; }
}

.scan-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  opacity: 0;
  letter-spacing: 0.15em;
  transition: opacity 0.4s ease 0.8s;
  white-space: nowrap;
}

.scan-divider.scanning .scan-label {
  opacity: 0.4;
}

/* =============================================
   Scroll Progress Bar
   ============================================= */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 9998;
  pointer-events: none;
}

/* =============================================
   Scroll Animations
   ============================================= */

/* Section reveal */
.reveal-section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Card/step stagger */
.reveal-card {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--stagger, 0) * 100ms);
}
.reveal-card.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Figure reveal — scale up from slightly smaller */
.reveal-figure {
  opacity: 0;
  transform: scale(0.97) translateY(24px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-figure.visible {
  opacity: 1;
  transform: scale(1) translateY(0);
}

/* Section title character animation */
.title-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal-section.visible .title-char {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   Responsive
   ============================================= */

@media (max-width: 768px) {
  .hero { padding: 72px 0 48px; }
  .teaser-card { padding: 28px 20px; }
  .method-step { flex-direction: column; gap: 12px; }
  .step-number { font-size: 24px; }
  .action-buttons { gap: 8px; }
  .btn { padding: 10px 18px; font-size: 14px; }
  .teaser-diagram { gap: 24px; }
  .diagram-node { padding: 16px 20px; }
}