/* ============================================
   KAIROS — Présentation
   Styles propres à presentation_kairos.html
   ============================================ */

    /* ═══════════════════════════════════════════
       RESET & BASE
       ═══════════════════════════════════════════ */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --bg-dark: #0a0a0f;
      --bg-section: #12121a;
      --bg-card: #1a1a25;
      --accent-purple: #8b5cf6;
      --accent-cyan: #06b6d4;
      --accent-orange: #f97316;
      --accent-green: #22c55e;
      --accent-red: #ef4444;
      --text-primary: #f1f5f9;
      --text-secondary: #94a3b8;
      --text-muted: #64748b;
      --border: rgba(255, 255, 255, 0.1);
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
      background: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* ═══════════════════════════════════════════
       NAVIGATION
       ═══════════════════════════════════════════ */
    nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(10, 10, 15, 0.9);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
      padding: 1rem 2rem;
    }

    nav ul {
      display: flex;
      justify-content: center;
      gap: 2rem;
      list-style: none;
    }

    nav a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.3s;
    }

    nav a:hover {
      color: var(--accent-purple);
    }

    /* ═══════════════════════════════════════════
       SECTIONS
       ═══════════════════════════════════════════ */
    section {
      min-height: 100vh;
      padding: 6rem 2rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .container {
      max-width: 1200px;
      width: 100%;
    }

    h1 {
      font-size: 4rem;
      font-weight: 700;
      margin-bottom: 1rem;
      background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    h2 {
      font-size: 2.5rem;
      margin-bottom: 2rem;
      color: var(--text-primary);
    }

    h3 {
      font-size: 1.5rem;
      margin-bottom: 1rem;
      color: var(--accent-purple);
    }

    p {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 700px;
    }

    .subtitle {
      font-size: 1.5rem;
      color: var(--text-muted);
      margin-bottom: 3rem;
    }

    /* ═══════════════════════════════════════════
       HERO
       ═══════════════════════════════════════════ */
    #hero {
      background: radial-gradient(ellipse at center, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
      text-align: center;
    }

    .hero-equation {
      font-family: 'Georgia', serif;
      font-size: 3rem;
      color: var(--accent-cyan);
      margin: 2rem 0;
      padding: 1.5rem 3rem;
      border: 2px solid var(--accent-cyan);
      border-radius: 8px;
      display: inline-block;
      background: rgba(6, 182, 212, 0.05);
    }

    .hero-legend {
      display: flex;
      justify-content: center;
      gap: 3rem;
      margin-top: 1rem;
      flex-wrap: wrap;
    }

    .hero-legend span {
      color: var(--text-muted);
      font-size: 1rem;
    }

    .scroll-indicator {
      position: absolute;
      bottom: 2rem;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
    }

    .scroll-indicator::after {
      content: '↓';
      font-size: 2rem;
      color: var(--text-muted);
    }

    @keyframes bounce {
      0%, 100% { transform: translateX(-50%) translateY(0); }
      50% { transform: translateX(-50%) translateY(10px); }
    }

    /* ═══════════════════════════════════════════
       PROBLÈME
       ═══════════════════════════════════════════ */
    #probleme {
      background: var(--bg-section);
    }

    .problem-visual {
      display: flex;
      gap: 2rem;
      margin-top: 3rem;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
    }

    .chat-bubble {
      padding: 1rem 1.5rem;
      border-radius: 1rem;
      max-width: 300px;
      font-size: 0.95rem;
    }

    .chat-human {
      background: var(--accent-purple);
      color: white;
      border-bottom-left-radius: 4px;
    }

    .chat-llm {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-bottom-right-radius: 4px;
    }

    .loop-arrow {
      font-size: 3rem;
      color: var(--accent-orange);
      animation: pulse 1.5s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.5; }
    }

    .quote-block {
      background: rgba(139, 92, 246, 0.1);
      border-left: 4px solid var(--accent-purple);
      padding: 1.5rem 2rem;
      margin: 2rem 0;
      font-style: italic;
      font-size: 1.3rem;
      color: var(--text-primary);
    }

    /* ═══════════════════════════════════════════
       SOLUTION / MODES
       ═══════════════════════════════════════════ */
    #solution {
      background: var(--bg-dark);
    }

    .modes-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      margin-top: 3rem;
    }

    @media (max-width: 900px) {
      .modes-container {
        grid-template-columns: 1fr;
      }
    }

    .mode-card {
      background: var(--bg-card);
      border-radius: 1rem;
      overflow: hidden;
      border: 1px solid var(--border);
      transition: transform 0.3s, border-color 0.3s;
    }

    .mode-card:hover {
      transform: translateY(-5px);
    }

    .mode-card.autonome:hover {
      border-color: var(--accent-cyan);
    }

    .mode-card.assiste:hover {
      border-color: var(--accent-purple);
    }

    .mode-header {
      padding: 1.5rem;
      text-align: center;
      border-bottom: 1px solid var(--border);
    }

    .mode-card.autonome .mode-header {
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), transparent);
    }

    .mode-card.assiste .mode-header {
      background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), transparent);
    }

    .mode-header h3 {
      margin-bottom: 0.5rem;
    }

    .mode-card.autonome .mode-header h3 {
      color: var(--accent-cyan);
    }

    .mode-card.assiste .mode-header h3 {
      color: var(--accent-purple);
    }

    .mode-header p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .mode-content {
      padding: 1.5rem;
    }

    .mode-content ul {
      list-style: none;
      margin-bottom: 1.5rem;
    }

    .mode-content li {
      padding: 0.5rem 0;
      padding-left: 1.5rem;
      position: relative;
      color: var(--text-secondary);
    }

    .mode-content li::before {
      content: '→';
      position: absolute;
      left: 0;
      color: var(--text-muted);
    }

    /* ═══════════════════════════════════════════
       APP MOCKUPS
       ═══════════════════════════════════════════ */
    .app-mockup {
      background: #0d0d12;
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--border);
      font-size: 0.75rem;
    }

    .mockup-toolbar {
      display: flex;
      gap: 0.5rem;
      padding: 0.5rem;
      background: #1a1a22;
      border-bottom: 1px solid var(--border);
      align-items: center;
    }

    .mockup-btn {
      padding: 0.3rem 0.6rem;
      border-radius: 4px;
      background: #2a2a35;
      color: var(--text-secondary);
      border: 1px solid var(--border);
      font-size: 0.7rem;
    }

    .mockup-btn.active {
      background: var(--accent-purple);
      color: white;
      border-color: var(--accent-purple);
    }

    .mockup-btn.cyan {
      background: rgba(6, 182, 212, 0.2);
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
    }

    .mockup-body {
      display: flex;
      height: 250px;
    }

    .mockup-canvas {
      flex: 1;
      padding: 1rem;
      position: relative;
      background:
        radial-gradient(circle at 30% 40%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
    }

    .mockup-sidebar {
      width: 180px;
      background: #0f0f15;
      border-left: 1px solid var(--border);
      padding: 0.5rem;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    /* Vignettes mockup */
    .vignette {
      position: absolute;
      padding: 0.5rem 0.8rem;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.7rem;
      color: var(--text-secondary);
      max-width: 120px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    }

    .vignette.selected {
      border-color: var(--accent-purple);
      box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.3);
    }

    .vignette.attractor {
      border-color: var(--accent-orange);
    }

    .vignette.attractor::after {
      content: '🧲';
      position: absolute;
      top: -8px;
      right: -8px;
      font-size: 0.8rem;
    }

    .vignette.friction {
      border-color: var(--accent-red);
      border-style: dashed;
    }

    .vignette.friction::before {
      content: '[FRICTION]';
      display: block;
      font-size: 0.6rem;
      color: var(--accent-red);
      margin-bottom: 0.2rem;
    }

    .vignette-tag {
      display: inline-block;
      font-size: 0.6rem;
      color: var(--accent-cyan);
      margin-top: 0.3rem;
    }

    /* Connexions SVG */
    .connections-svg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    .connections-svg line {
      stroke: var(--text-muted);
      stroke-width: 1;
      opacity: 0.4;
    }

    /* Sidebar mockup */
    .sidebar-section {
      background: #1a1a22;
      border-radius: 4px;
      padding: 0.5rem;
    }

    .sidebar-section h4 {
      font-size: 0.65rem;
      color: var(--text-muted);
      margin-bottom: 0.3rem;
      text-transform: uppercase;
    }

    .sidebar-btn {
      display: block;
      width: 100%;
      padding: 0.4rem;
      margin-top: 0.3rem;
      background: #2a2a35;
      border: 1px solid var(--border);
      border-radius: 4px;
      color: var(--text-secondary);
      font-size: 0.65rem;
      text-align: left;
      cursor: pointer;
    }

    .sidebar-btn:hover {
      background: #3a3a45;
    }

    .sidebar-btn.primary {
      background: var(--accent-purple);
      border-color: var(--accent-purple);
      color: white;
    }

    /* Webview mockup */
    .mockup-webview {
      background: #1a1a22;
      border-radius: 4px;
      padding: 0.5rem;
      flex: 1;
      overflow: hidden;
    }

    .webview-header {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border);
      margin-bottom: 0.5rem;
    }

    .webview-header .provider {
      font-size: 0.7rem;
      color: var(--accent-cyan);
    }

    .webview-content {
      font-size: 0.6rem;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* Friction indicator */
    .friction-indicator {
      display: flex;
      align-items: center;
      gap: 0.3rem;
      padding: 0.2rem 0.5rem;
      background: rgba(249, 115, 22, 0.2);
      border: 1px solid var(--accent-orange);
      border-radius: 4px;
      font-size: 0.65rem;
      color: var(--accent-orange);
    }

    /* Intention Gate mockup */
    .intention-gate {
      background: linear-gradient(180deg, #0d0d12 0%, #1a1a25 100%);
      border-radius: 8px;
      padding: 1.5rem;
      text-align: center;
      border: 1px solid var(--border);
    }

    .intention-gate h4 {
      color: var(--accent-cyan);
      margin-bottom: 1rem;
      font-size: 0.9rem;
    }

    .intention-input {
      width: 100%;
      padding: 0.8rem;
      background: #0d0d12;
      border: 1px solid var(--accent-cyan);
      border-radius: 6px;
      color: var(--text-primary);
      font-size: 0.8rem;
      margin-bottom: 0.8rem;
    }

    .intention-input::placeholder {
      color: var(--text-muted);
    }

    .intention-btn {
      padding: 0.6rem 1.5rem;
      background: var(--accent-cyan);
      border: none;
      border-radius: 6px;
      color: #0d0d12;
      font-weight: 600;
      font-size: 0.8rem;
      cursor: pointer;
    }

    .gate-hint {
      margin-top: 0.8rem;
      font-size: 0.7rem;
      color: var(--text-muted);
      font-style: italic;
    }

    /* Mode enhancements */
    .section-intro {
      max-width: 700px;
      margin: 0 auto 2rem;
      text-align: center;
    }

    .mode-icon-badge {
      margin-bottom: 0.8rem;
    }

    .mode-tagline {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.5;
      margin-top: 0.5rem;
    }

    .mode-philosophy {
      background: rgba(255,255,255,0.03);
      border-left: 3px solid var(--accent-purple);
      padding: 1rem;
      margin-bottom: 1.5rem;
      font-size: 0.85rem;
      line-height: 1.6;
      color: var(--text-secondary);
    }

    .mode-card.autonome .mode-philosophy {
      border-left-color: var(--accent-cyan);
    }

    .mode-card.assiste .mode-philosophy {
      border-left-color: var(--accent-red);
    }

    .mode-features {
      list-style: none;
      padding: 0;
      margin: 0 0 1.5rem 0;
    }

    .mode-features li {
      display: flex;
      align-items: flex-start;
      gap: 0.8rem;
      margin-bottom: 1rem;
      padding: 0.6rem;
      background: rgba(255,255,255,0.02);
      border-radius: 6px;
    }

    .mode-features .feature-icon {
      font-size: 1.1rem;
      flex-shrink: 0;
      width: 1.5rem;
      text-align: center;
    }

    .mode-features li div {
      display: flex;
      flex-direction: column;
      gap: 0.2rem;
    }

    .mode-features li strong {
      color: var(--text-primary);
      font-size: 0.85rem;
    }

    .mode-features li span {
      color: var(--text-muted);
      font-size: 0.75rem;
    }

    .mode-ideal {
      padding: 0.8rem 1rem;
      background: rgba(139, 92, 246, 0.1);
      border-radius: 6px;
      font-size: 0.8rem;
      margin-bottom: 1.5rem;
    }

    .mode-card.autonome .mode-ideal {
      background: rgba(107, 140, 255, 0.1);
    }

    .mode-card.assiste .mode-ideal {
      background: rgba(255, 107, 107, 0.1);
    }

    /* Chat mockup for Autonome */
    .mockup-chat {
      background: #1a1a22;
      border-radius: 4px;
      padding: 0.6rem;
      margin-top: 0.5rem;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .chat-bubble {
      padding: 0.5rem 0.7rem;
      border-radius: 8px;
      font-size: 0.65rem;
      line-height: 1.4;
      max-width: 85%;
    }

    .chat-bubble.user {
      background: rgba(107, 140, 255, 0.2);
      border: 1px solid rgba(107, 140, 255, 0.3);
      color: var(--text-secondary);
      align-self: flex-end;
    }

    .chat-bubble.ai {
      background: rgba(139, 92, 246, 0.15);
      border: 1px solid rgba(139, 92, 246, 0.3);
      color: var(--text-secondary);
      align-self: flex-start;
    }

    .autonome-canvas {
      min-height: 180px;
    }

    /* Sidebar enhancements */
    .friction-badge {
      font-size: 0.55rem;
      background: rgba(249, 115, 22, 0.2);
      padding: 0.15rem 0.4rem;
      border-radius: 3px;
      color: var(--accent-orange);
    }

    .active-badge {
      background: rgba(139, 92, 246, 0.3) !important;
      border-color: rgba(139, 92, 246, 0.5) !important;
    }

    .mockup-webview .webview-content strong {
      color: var(--accent-red);
    }

    /* Modes comparison table */
    .modes-comparison {
      margin-top: 4rem;
      padding: 2rem;
      background: rgba(255,255,255,0.02);
      border-radius: 12px;
      border: 1px solid var(--border);
    }

    .modes-comparison h3 {
      text-align: center;
      margin-bottom: 1.5rem;
      color: var(--text-primary);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.85rem;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 0.8rem 1rem;
      text-align: left;
      border-bottom: 1px solid var(--border);
    }

    .comparison-table th {
      color: var(--text-primary);
      font-weight: 600;
      background: rgba(255,255,255,0.03);
    }

    .comparison-table th:nth-child(2) {
      color: var(--accent-cyan);
    }

    .comparison-table th:nth-child(3) {
      color: var(--accent-red);
    }

    .comparison-table td:first-child {
      color: var(--text-muted);
      font-weight: 500;
    }

    .comparison-table td {
      color: var(--text-secondary);
    }

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

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

    @media (max-width: 768px) {
      .modes-comparison {
        padding: 1rem;
        overflow-x: auto;
      }

      .comparison-table {
        font-size: 0.75rem;
      }

      .comparison-table th,
      .comparison-table td {
        padding: 0.5rem;
      }
    }

    /* ═══════════════════════════════════════════
       MÉCANISMES
       ═══════════════════════════════════════════ */
    #mecanismes {
      background: var(--bg-section);
    }

    .mechanisms-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 3rem;
    }

    @media (max-width: 900px) {
      .mechanisms-grid {
        grid-template-columns: 1fr;
      }
    }

    .mechanism-card {
      background: var(--bg-card);
      border-radius: 1rem;
      padding: 2rem;
      border: 1px solid var(--border);
      transition: border-color 0.3s;
    }

    .mechanism-card:hover {
      border-color: var(--accent-purple);
    }

    .mechanism-icon {
      font-size: 2.5rem;
      margin-bottom: 1rem;
    }

    .mechanism-card h3 {
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .mechanism-card p {
      font-size: 0.95rem;
    }

    .signal-list {
      margin-top: 1rem;
      padding-left: 1rem;
    }

    .signal-list li {
      color: var(--text-muted);
      font-size: 0.85rem;
      padding: 0.2rem 0;
    }

    /* ═══════════════════════════════════════════
       ÉQUATION DÉTAILLÉE
       ═══════════════════════════════════════════ */
    #equation {
      background: var(--bg-dark);
    }

    .equation-diagram {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 2rem;
      margin: 3rem 0;
      flex-wrap: wrap;
    }

    .var-box {
      text-align: center;
      padding: 1.5rem 2rem;
      background: var(--bg-card);
      border-radius: 1rem;
      border: 2px solid var(--border);
      min-width: 200px;
    }

    .var-box.intention {
      border-color: var(--accent-green);
    }

    .var-box.friction {
      border-color: var(--accent-orange);
    }

    .var-box.linearisation {
      border-color: var(--accent-red);
    }

    .var-box .var-letter {
      font-size: 2.5rem;
      font-weight: 700;
      font-family: Georgia, serif;
    }

    .var-box.intention .var-letter { color: var(--accent-green); }
    .var-box.friction .var-letter { color: var(--accent-orange); }
    .var-box.linearisation .var-letter { color: var(--accent-red); }

    .var-box .var-name {
      font-size: 1rem;
      color: var(--text-secondary);
      margin-top: 0.5rem;
    }

    .var-box .var-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 0.5rem;
    }

    .equation-operator {
      font-size: 2rem;
      color: var(--text-muted);
    }

    /* ═══════════════════════════════════════════
       FOOTER
       ═══════════════════════════════════════════ */
    footer {
      background: var(--bg-section);
      padding: 3rem 2rem;
      text-align: center;
      border-top: 1px solid var(--border);
    }

    footer p {
      margin: 0 auto;
      color: var(--text-muted);
    }

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

    footer a:hover {
      text-decoration: underline;
    }

    .version {
      margin-top: 1rem;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* ═══════════════════════════════════════════
       ANIMATIONS
       ═══════════════════════════════════════════ */
    .fade-in {
      opacity: 0;
      transform: translateY(20px);
      animation: fadeIn 0.8s ease forwards;
    }

    @keyframes fadeIn {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .delay-1 { animation-delay: 0.2s; }
    .delay-2 { animation-delay: 0.4s; }
    .delay-3 { animation-delay: 0.6s; }

    /* ═══════════════════════════════════════════
       GENÈSE
       ═══════════════════════════════════════════ */
    #genese {
      background: var(--bg-dark);
    }

    .timeline {
      position: relative;
      padding-left: 2rem;
      margin: 3rem 0;
    }

    .timeline::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(180deg, var(--accent-purple), var(--accent-cyan));
    }

    .timeline-item {
      position: relative;
      padding: 1.5rem;
      margin-bottom: 1.5rem;
      background: var(--bg-card);
      border-radius: 0.5rem;
      border: 1px solid var(--border);
    }

    .timeline-item::before {
      content: '';
      position: absolute;
      left: -2.35rem;
      top: 1.8rem;
      width: 12px;
      height: 12px;
      background: var(--accent-purple);
      border-radius: 50%;
      border: 2px solid var(--bg-dark);
    }

    .timeline-item h4 {
      color: var(--accent-cyan);
      font-size: 0.9rem;
      margin-bottom: 0.5rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .timeline-item p {
      font-size: 1rem;
      margin: 0;
    }

    .highlight-text {
      color: var(--accent-purple);
      font-weight: 600;
    }

    /* ═══════════════════════════════════════════
       AVANT / APRÈS
       ═══════════════════════════════════════════ */
    .comparison-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin: 3rem 0;
    }

    @media (max-width: 800px) {
      .comparison-container {
        grid-template-columns: 1fr;
      }
    }

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

    .comparison-box.before {
      border-color: rgba(239, 68, 68, 0.3);
    }

    .comparison-box.after {
      border-color: rgba(34, 197, 94, 0.3);
    }

    .comparison-header {
      padding: 1rem 1.5rem;
      text-align: center;
      font-weight: 600;
    }

    .comparison-box.before .comparison-header {
      background: rgba(239, 68, 68, 0.1);
      color: var(--accent-red);
    }

    .comparison-box.after .comparison-header {
      background: rgba(34, 197, 94, 0.1);
      color: var(--accent-green);
    }

    .comparison-content {
      padding: 1.5rem;
    }

    .mini-chat {
      margin-bottom: 1rem;
    }

    .mini-chat-human, .mini-chat-llm {
      padding: 0.6rem 1rem;
      border-radius: 0.5rem;
      font-size: 0.85rem;
      margin-bottom: 0.5rem;
    }

    .mini-chat-human {
      background: rgba(139, 92, 246, 0.2);
      color: var(--text-primary);
      margin-right: 2rem;
    }

    .mini-chat-llm {
      background: var(--bg-section);
      color: var(--text-secondary);
      margin-left: 2rem;
    }

    .mini-chat-friction {
      background: rgba(249, 115, 22, 0.15);
      border: 1px dashed var(--accent-orange);
      color: var(--accent-orange);
      padding: 0.6rem 1rem;
      border-radius: 0.5rem;
      font-size: 0.8rem;
      margin: 0.5rem 0;
      text-align: center;
    }

    .comparison-result {
      text-align: center;
      padding-top: 1rem;
      border-top: 1px solid var(--border);
      margin-top: 1rem;
      font-size: 0.9rem;
    }

    .comparison-box.before .comparison-result {
      color: var(--accent-red);
    }

    .comparison-box.after .comparison-result {
      color: var(--accent-green);
    }

    /* ═══════════════════════════════════════════
       FONDEMENTS
       ═══════════════════════════════════════════ */
    #fondements {
      background: var(--bg-section);
    }

    .sources-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1.5rem;
      margin-top: 3rem;
    }

    @media (max-width: 800px) {
      .sources-grid {
        grid-template-columns: 1fr;
      }
    }

    .source-card {
      background: var(--bg-card);
      border-radius: 1rem;
      padding: 1.5rem;
      border: 1px solid var(--border);
      transition: border-color 0.3s;
    }

    .source-card:hover {
      border-color: var(--accent-purple);
    }

    .source-icon {
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    .source-card h4 {
      color: var(--text-primary);
      font-size: 1.1rem;
      margin-bottom: 0.3rem;
    }

    .source-card .author {
      color: var(--accent-cyan);
      font-size: 0.85rem;
      margin-bottom: 0.8rem;
    }

    .source-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* ═══════════════════════════════════════════
       ÉVOLUTION
       ═══════════════════════════════════════════ */
    #evolution {
      background: var(--bg-dark);
    }

    .evolution-flow {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 1rem;
      margin: 3rem 0;
      flex-wrap: wrap;
    }

    .evolution-step {
      background: var(--bg-card);
      border-radius: 1rem;
      padding: 1.5rem;
      text-align: center;
      border: 1px solid var(--border);
      min-width: 200px;
      max-width: 250px;
    }

    .evolution-step.problem {
      border-color: rgba(239, 68, 68, 0.3);
    }

    .evolution-step.solution {
      border-color: rgba(34, 197, 94, 0.3);
    }

    .evolution-step h4 {
      font-size: 0.8rem;
      color: var(--text-muted);
      text-transform: uppercase;
      margin-bottom: 0.5rem;
    }

    .evolution-step .equation {
      font-family: Georgia, serif;
      font-size: 1.1rem;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .evolution-step.problem .equation {
      text-decoration: line-through;
      color: var(--text-muted);
    }

    .evolution-step p {
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    .evolution-arrow {
      font-size: 2rem;
      color: var(--accent-purple);
    }

    .evolution-insight {
      background: rgba(139, 92, 246, 0.1);
      border: 1px solid var(--accent-purple);
      border-radius: 1rem;
      padding: 1.5rem;
      max-width: 250px;
      text-align: center;
    }

    .evolution-insight h4 {
      color: var(--accent-purple);
      margin-bottom: 0.5rem;
    }

    .evolution-insight p {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    /* ═══════════════════════════════════════════
       DÉMO INTERACTIVE
       ═══════════════════════════════════════════ */
    #demo {
      background: var(--bg-section);
    }

    .demo-container {
      display: grid;
      grid-template-columns: 1fr 300px;
      gap: 2rem;
      margin-top: 2rem;
    }

    @media (max-width: 900px) {
      .demo-container {
        grid-template-columns: 1fr;
      }
    }

    .demo-canvas {
      background: var(--bg-dark);
      border-radius: 1rem;
      border: 1px solid var(--border);
      min-height: 400px;
      position: relative;
      overflow: hidden;
    }

    .demo-toolbar {
      display: flex;
      gap: 0.5rem;
      padding: 0.8rem;
      background: var(--bg-card);
      border-bottom: 1px solid var(--border);
    }

    .demo-btn {
      padding: 0.5rem 1rem;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: var(--bg-section);
      color: var(--text-secondary);
      font-size: 0.8rem;
      cursor: pointer;
      transition: all 0.2s;
    }

    .demo-btn:hover {
      background: var(--accent-purple);
      border-color: var(--accent-purple);
      color: white;
    }

    .demo-btn.reset {
      background: rgba(239, 68, 68, 0.2);
      border-color: var(--accent-red);
      color: var(--accent-red);
    }

    .demo-btn.reset:hover {
      background: var(--accent-red);
      color: white;
    }

    .demo-area {
      padding: 1rem;
      min-height: 420px;
      position: relative;
    }

    .demo-vignette {
      position: absolute;
      padding: 0.6rem 1rem;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 0.8rem;
      color: var(--text-secondary);
      max-width: 200px;
      cursor: grab;
      touch-action: none;
      user-select: none;
      transition: border-color 0.3s, box-shadow 0.3s;
      animation: popIn 0.3s ease;
    }

    @keyframes popIn {
      from { transform: scale(0.8); opacity: 0; }
      to { transform: scale(1); opacity: 1; }
    }

    .demo-vignette:hover {
      border-color: var(--accent-purple);
    }

    .demo-vignette.similar {
      border-color: var(--accent-orange);
      background: rgba(249, 115, 22, 0.1);
    }

    .demo-vignette.friction {
      border-color: var(--accent-red);
      border-style: dashed;
      animation: frictionPulse 1s ease;
    }

    @keyframes frictionPulse {
      0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
      50% { box-shadow: 0 0 20px 5px rgba(239, 68, 68, 0.2); }
    }

    .demo-panel {
      background: var(--bg-card);
      border-radius: 1rem;
      border: 1px solid var(--border);
      padding: 1.5rem;
    }

    .demo-panel h4 {
      color: var(--text-primary);
      margin-bottom: 1rem;
      font-size: 1rem;
    }

    .demo-score {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1rem;
      background: var(--bg-section);
      border-radius: 8px;
      margin-bottom: 1rem;
    }

    .demo-score-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .demo-score-value {
      font-size: 2rem;
      font-weight: 700;
      transition: color 0.3s;
    }

    .demo-score-value.low { color: var(--accent-green); }
    .demo-score-value.medium { color: var(--accent-orange); }
    .demo-score-value.high { color: var(--accent-red); }

    .demo-threshold {
      height: 8px;
      background: var(--bg-section);
      border-radius: 4px;
      overflow: hidden;
      margin-bottom: 1rem;
    }

    .demo-threshold-bar {
      height: 100%;
      background: var(--accent-green);
      transition: width 0.3s, background 0.3s;
      border-radius: 4px;
    }

    .demo-signals {
      margin-top: 1rem;
    }

    .demo-signal {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.5rem;
      background: var(--bg-section);
      border-radius: 6px;
      margin-bottom: 0.5rem;
      font-size: 0.8rem;
      color: var(--text-muted);
      opacity: 0.5;
      transition: opacity 0.3s;
    }

    .demo-signal.active {
      opacity: 1;
      color: var(--accent-orange);
      background: rgba(249, 115, 22, 0.1);
    }

    .demo-friction-alert {
      display: none;
      padding: 1rem;
      background: rgba(239, 68, 68, 0.1);
      border: 1px solid var(--accent-red);
      border-radius: 8px;
      text-align: center;
      color: var(--accent-red);
      margin-top: 1rem;
      animation: alertPulse 0.5s ease;
    }

    .demo-friction-alert.show {
      display: block;
    }

    @keyframes alertPulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.02); }
    }

    /* Bouton DÉVELOPPER */
    .demo-btn.primary {
      background: var(--accent-purple);
      border-color: var(--accent-purple);
      color: white;
      font-weight: 600;
    }

    .demo-btn.primary:hover {
      background: #7c3aed;
      border-color: #7c3aed;
    }

    .demo-btn:disabled {
      opacity: 0.4;
      cursor: not-allowed;
    }

    .demo-btn.primary:disabled {
      opacity: 0.4;
      cursor: not-allowed;
    }

    /* Jauge O₂ inline toolbar */
    .demo-o2-inline {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      margin-left: auto;
      padding: 0.3rem 0.6rem;
      background: rgba(0, 0, 0, 0.3);
      border-radius: 6px;
    }

    .demo-o2-lbl {
      font-size: 0.7rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .demo-o2-track {
      width: 80px;
      height: 6px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 3px;
      overflow: hidden;
    }

    .demo-o2-fill {
      height: 100%;
      width: 50%;
      background: var(--accent-orange);
      border-radius: 3px;
      transition: width 0.5s, background 0.5s;
    }

    .demo-o2-val {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent-orange);
      min-width: 24px;
      text-align: right;
      transition: color 0.5s;
    }

    /* SVG connexions */
    .demo-svg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 0;
    }

    .demo-svg line {
      stroke: rgba(148, 163, 184, 0.6);
      stroke-width: 2;
    }

    .demo-svg line.friction-line {
      stroke: var(--accent-red);
      stroke-dasharray: 6 4;
      stroke-width: 2;
      opacity: 0.8;
    }

    /* Vignette dragging */
    .demo-vignette.dragging {
      cursor: grabbing;
      z-index: 10;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    }

    /* Tags dans les vignettes */
    .demo-vignette .vtags {
      margin-top: 0.3rem;
    }

    .demo-vignette .vtag {
      display: inline-block;
      font-size: 0.6rem;
      color: var(--accent-cyan);
      margin-right: 0.25rem;
    }

    /* Mode d'emploi panel */
    .demo-how p {
      font-size: 0.8rem;
      color: var(--text-secondary);
      margin-bottom: 0.4rem;
      padding: 0.3rem 0;
      max-width: none;
    }

    .demo-how-o2 {
      padding: 0.5rem 0.75rem !important;
      background: rgba(239, 68, 68, 0.08);
      border-radius: 6px;
      border-left: 3px solid var(--accent-red);
      margin-top: 0.5rem !important;
    }

    /* Journal */
    .demo-log {
      max-height: 160px;
      overflow-y: auto;
      font-size: 0.75rem;
    }

    .demo-log-entry {
      padding: 0.3rem 0;
      color: var(--text-muted);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .demo-log-entry.warn { color: var(--accent-orange); }
    .demo-log-entry.danger { color: var(--accent-red); }
    .demo-log-entry.success { color: var(--accent-green); }

    /* ═══════════════════════════════════════════
       SECTION ESSAYER — IFRAME KAIROS
       ═══════════════════════════════════════════ */
    #essayer {
      padding: 6rem 2rem;
      background: var(--bg-dark);
      min-height: auto;
    }

    /* Guide étapes */
    .guide-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      margin: 2.5rem 0;
    }

    .guide-step {
      background: var(--bg-card);
      border-radius: 1rem;
      padding: 1.5rem;
      border: 1px solid var(--border);
      position: relative;
    }

    .guide-step-number {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--accent-purple);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 0.75rem;
    }

    .guide-step h4 {
      color: var(--text-primary);
      margin-bottom: 0.5rem;
      font-size: 1rem;
    }

    .guide-step p {
      font-size: 0.85rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    /* Tips en ligne */
    .guide-tips {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
      margin-bottom: 2rem;
    }

    .guide-tip {
      background: rgba(139, 92, 246, 0.08);
      border: 1px solid rgba(139, 92, 246, 0.15);
      border-radius: 6px;
      padding: 0.5rem 1rem;
      font-size: 0.8rem;
      color: var(--text-secondary);
    }

    .guide-tip strong {
      color: var(--accent-purple);
    }

    /* Bouton aide clé API */
    .guide-help-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--accent-purple);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      cursor: pointer;
      margin-left: 0.5rem;
      vertical-align: middle;
      transition: background 0.2s, transform 0.2s;
    }

    .guide-help-btn:hover {
      background: #7c3aed;
      transform: scale(1.15);
    }

    /* Panneau guide clés API */
    .api-key-guide {
      background: var(--bg-card);
      border: 1px solid rgba(139, 92, 246, 0.3);
      border-radius: 12px;
      padding: 1.5rem 2rem;
      margin-bottom: 2rem;
      animation: fadeIn 0.3s ease;
    }

    .api-key-guide.hidden {
      display: none;
    }

    .api-key-guide h4 {
      color: var(--accent-purple);
      margin-bottom: 0.5rem;
      font-size: 1.1rem;
    }

    .api-key-guide > p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-bottom: 1.5rem;
    }

    .api-key-providers {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
    }

    .api-key-provider {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 1rem 1.25rem;
    }

    .api-key-provider strong {
      color: var(--text-primary);
      font-size: 0.95rem;
      display: block;
      margin-bottom: 0.5rem;
    }

    .api-key-provider ol {
      padding-left: 1.2rem;
      margin: 0;
    }

    .api-key-provider li {
      font-size: 0.8rem;
      color: var(--text-secondary);
      margin-bottom: 0.3rem;
      line-height: 1.5;
    }

    .api-key-provider a {
      color: var(--accent-cyan);
      text-decoration: none;
    }

    .api-key-provider a:hover {
      text-decoration: underline;
    }

    .api-key-provider code {
      background: rgba(139, 92, 246, 0.15);
      padding: 0.1rem 0.3rem;
      border-radius: 3px;
      font-size: 0.75rem;
      color: var(--accent-cyan);
    }

    .api-key-model {
      display: block;
      margin-top: 0.5rem;
      font-size: 0.75rem;
      color: var(--text-muted);
      font-style: italic;
    }

    .api-key-cost {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 1rem;
      padding-top: 0.75rem;
      border-top: 1px solid var(--border);
    }

    @media (max-width: 600px) {
      .api-key-providers {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 1024px) {
      .guide-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 600px) {
      .guide-grid {
        grid-template-columns: 1fr;
      }
    }

    .essayer-note {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
      padding: 0.75rem 1rem;
      border-left: 3px solid var(--accent-purple);
      background: rgba(139, 92, 246, 0.08);
      border-radius: 0 6px 6px 0;
    }

    .kairos-iframe-wrapper {
      position: relative;
      width: 100%;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    }

    .kairos-iframe-wrapper iframe {
      width: 100%;
      height: 700px;
      border: none;
      display: block;
      background: #0d1117;
    }

    @media (max-width: 768px) {
      .kairos-iframe-wrapper iframe {
        height: 500px;
      }
    }

    /* ═══════════════════════════════════════════
       CAS D'USAGE
       ═══════════════════════════════════════════ */
    #usecases {
      background: var(--bg-dark);
    }

    .usecases-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      margin-top: 3rem;
    }

    @media (max-width: 900px) {
      .usecases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 500px) {
      .usecases-grid {
        grid-template-columns: 1fr;
      }
    }

    .usecase-card {
      background: var(--bg-card);
      border-radius: 1rem;
      padding: 2rem 1.5rem;
      text-align: center;
      border: 1px solid var(--border);
      transition: transform 0.3s, border-color 0.3s;
    }

    .usecase-card:hover {
      transform: translateY(-5px);
      border-color: var(--accent-purple);
    }

    .usecase-icon {
      font-size: 3rem;
      margin-bottom: 1rem;
    }

    .usecase-card h4 {
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .usecase-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* ═══════════════════════════════════════════
       VISION / ROADMAP
       ═══════════════════════════════════════════ */
    #vision {
      background: var(--bg-section);
    }

    .roadmap {
      display: flex;
      flex-direction: column;
      gap: 0;
      margin-top: 3rem;
      position: relative;
      padding-left: 3rem;
    }

    .roadmap::before {
      content: '';
      position: absolute;
      left: 1rem;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(180deg, var(--accent-green), var(--accent-cyan), var(--accent-purple));
    }

    .roadmap-item {
      position: relative;
      padding: 1.5rem;
      background: var(--bg-card);
      border-radius: 1rem;
      border: 1px solid var(--border);
      margin-bottom: 1.5rem;
    }

    .roadmap-item::before {
      content: '';
      position: absolute;
      left: -2.5rem;
      top: 1.8rem;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      border: 3px solid var(--bg-section);
    }

    .roadmap-item.done::before {
      background: var(--accent-green);
    }

    .roadmap-item.current::before {
      background: var(--accent-cyan);
      box-shadow: 0 0 10px var(--accent-cyan);
    }

    .roadmap-item.future::before {
      background: var(--accent-purple);
    }

    .roadmap-item .phase {
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: 0.5rem;
    }

    .roadmap-item.done .phase { color: var(--accent-green); }
    .roadmap-item.current .phase { color: var(--accent-cyan); }
    .roadmap-item.future .phase { color: var(--accent-purple); }

    .roadmap-item h4 {
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .roadmap-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin: 0;
    }

    .roadmap-item ul {
      margin-top: 0.5rem;
      padding-left: 1.2rem;
    }

    .roadmap-item li {
      font-size: 0.85rem;
      color: var(--text-secondary);
      margin-bottom: 0.3rem;
    }
    /* ═══════════════════════════════════════════
       DOCUMENTATION
       ═══════════════════════════════════════════ */
    #documentation {
      background: var(--bg-dark);
      min-height: auto;
      padding: 4rem 2rem;
    }

    .docs-layout {
      display: grid;
      grid-template-columns: 240px 1fr;
      gap: 2rem;
      margin-top: 2rem;
    }

    @media (max-width: 900px) {
      .docs-layout {
        grid-template-columns: 1fr;
      }
    }

    .docs-sidebar {
      display: flex;
      flex-direction: column;
      gap: 0.25rem;
    }

    .docs-sidebar-btn {
      display: block;
      width: 100%;
      padding: 0.6rem 1rem;
      background: transparent;
      border: 1px solid transparent;
      border-radius: 6px;
      color: var(--text-muted);
      font-size: 0.85rem;
      text-align: left;
      cursor: pointer;
      transition: all 0.2s;
    }

    .docs-sidebar-btn:hover {
      color: var(--text-secondary);
      background: rgba(255,255,255,0.03);
    }

    .docs-sidebar-btn.active {
      color: var(--accent-purple);
      background: rgba(139, 92, 246, 0.1);
      border-color: rgba(139, 92, 246, 0.3);
    }

    .docs-content {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 2rem;
      min-height: 400px;
      overflow-x: auto;
    }

    .docs-content h1 {
      font-size: 2rem;
      background: none;
      -webkit-text-fill-color: var(--text-primary);
      margin-bottom: 1.5rem;
    }

    .docs-content h2 {
      font-size: 1.5rem;
      margin-top: 2rem;
      margin-bottom: 1rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border);
    }

    .docs-content h3 {
      font-size: 1.2rem;
      color: var(--accent-cyan);
      margin-top: 1.5rem;
      margin-bottom: 0.75rem;
    }

    .docs-content h4 {
      font-size: 1rem;
      color: var(--text-primary);
      margin-top: 1.2rem;
      margin-bottom: 0.5rem;
    }

    .docs-content p {
      font-size: 0.95rem;
      max-width: none;
      margin-bottom: 1rem;
    }

    .docs-content ul, .docs-content ol {
      margin-bottom: 1rem;
      padding-left: 1.5rem;
    }

    .docs-content li {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-bottom: 0.3rem;
    }

    .docs-content code {
      background: rgba(139, 92, 246, 0.15);
      padding: 0.15rem 0.4rem;
      border-radius: 4px;
      font-size: 0.85rem;
      font-family: 'Consolas', 'JetBrains Mono', monospace;
      color: var(--accent-cyan);
    }

    .docs-content pre {
      background: #0a0a0f;
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 1rem;
      overflow-x: auto;
      margin: 1rem 0;
    }

    .docs-content pre code {
      background: none;
      padding: 0;
      font-size: 0.8rem;
      color: var(--text-secondary);
    }

    .docs-content table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.85rem;
      margin: 1rem 0;
    }

    .docs-content th {
      text-align: left;
      padding: 0.6rem 0.8rem;
      background: rgba(255,255,255,0.03);
      color: var(--text-primary);
      border-bottom: 1px solid var(--border);
      font-weight: 600;
    }

    .docs-content td {
      padding: 0.6rem 0.8rem;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      color: var(--text-secondary);
    }

    .docs-content blockquote {
      border-left: 3px solid var(--accent-purple);
      padding: 0.5rem 1rem;
      margin: 1rem 0;
      background: rgba(139, 92, 246, 0.05);
      border-radius: 0 6px 6px 0;
    }

    .docs-content blockquote p {
      color: var(--text-secondary);
      font-style: italic;
      margin: 0;
    }

    .docs-content hr {
      border: none;
      border-top: 1px solid var(--border);
      margin: 2rem 0;
    }

    .docs-loading {
      text-align: center;
      padding: 3rem;
      color: var(--text-muted);
    }

    .docs-error {
      text-align: center;
      padding: 2rem;
      color: var(--accent-red);
    }

    /* ═══════════════════════════════════════════
       MOBILE ≤ 480px
       ═══════════════════════════════════════════ */
    @media (max-width: 480px) {
      /* Sections & typographie */
      section {
        padding: 3rem 1rem;
        min-height: auto;
      }

      h1 { font-size: 2.5rem; }
      h2 { font-size: 1.75rem; }
      .subtitle { font-size: 1.1rem; margin-bottom: 2rem; }

      /* Navigation */
      nav { padding: 0.75rem 1rem; }
      nav ul { gap: 1rem; flex-wrap: wrap; }
      nav a { font-size: 0.8rem; }

      /* Hero */
      .hero-equation {
        font-size: 1.8rem;
        padding: 1rem 1.5rem;
        max-width: 100%;
        overflow-x: auto;
      }
      .hero-legend { gap: 1.5rem; }
      .hero-legend span { font-size: 0.85rem; }

      /* Problème */
      .quote-block {
        padding: 1rem 1.25rem;
        font-size: 1.1rem;
      }
      .chat-bubble { max-width: 100%; }

      /* Modes / Comparaison */
      .mode-card .mockup-main { padding: 1rem; }
      .mockup-sidebar { width: 120px; }
      .mini-chat-human { margin-right: 1rem; }
      .mini-chat-llm { margin-left: 1rem; }

      /* Mécanismes */
      .mechanism-card { padding: 1.5rem; }

      /* Démo interactive */
      .demo-canvas { min-height: 280px; }
      .demo-area { min-height: 300px; }
      .demo-vignette { max-width: 150px; font-size: 0.75rem; }
      .demo-panel { padding: 1rem; }
      .demo-toolbar { flex-wrap: wrap; }

      /* Avant / Après */
      .comparison-content { padding: 1rem; }

      /* Fondements */
      .source-card { padding: 1rem; }

      /* Section Essayer — iframe */
      .kairos-iframe-wrapper iframe { height: 400px; }
      .essayer-note { font-size: 0.8rem; }

      /* Cas d'usage */
      .usecase-card { padding: 1.5rem 1rem; }
      .usecase-icon { font-size: 2.5rem; }

      /* Vision / Roadmap */
      .roadmap { padding-left: 2rem; }
      .roadmap-item { padding: 1rem; }
      .roadmap-item::before { left: -1.75rem; width: 12px; height: 12px; }

      /* Guide steps */
      .guide-step { padding: 1rem; }

      /* Documentation */
      #documentation { padding: 3rem 1rem; }
      .docs-content { padding: 1rem; min-height: 300px; }
      .docs-content h1 { font-size: 1.5rem; }
      .docs-content h2 { font-size: 1.2rem; }
      .docs-content code { overflow-wrap: break-word; }
    }