/* ─────────────────── RESET & VARIABLES ─────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --bg:        #0b1120;
      --bg2:       #111827;
      --bg3:       #0f1e30;
      --primary:   #00d4a0;
      --primary-d: #00a87e;
      --accent:    #ff6b35;
      --accent-d:  #e0541e;
      --text:      #e2e8f0;
      --muted:     #94a3b8;
      --card:      #162033;
      --card-b:    #1e2e48;
      --border:    rgba(0,212,160,.18);
      --radius:    14px;
      --shadow:    0 8px 40px rgba(0,0,0,.45);
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: 'Open Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      overflow-x: hidden;
      line-height: 1.6;
    }

    h1, h2, h3, h4 { font-family: 'Montserrat', sans-serif; }

    a { color: var(--primary); text-decoration: none; }

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

    section { padding: 90px 20px; }

    .container { max-width: 1100px; margin: 0 auto; }

    /* ─────────────────── NAVBAR ─────────────────── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      background: rgba(11,17,32,.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border);
      transition: background .3s;
    }

    .nav-inner {
      max-width: 1100px; margin: 0 auto;
      display: flex; align-items: center; justify-content: space-between;
      padding: 14px 20px;
    }

    .logo {
      display: flex; align-items: center; gap: 10px;
      font-family: 'Montserrat', sans-serif; font-weight: 900; font-size: 1.25rem;
      color: var(--text);
    }

    .logo span { color: var(--primary); }

    .logo-icon {
      width: 38px; height: 38px;
      background: linear-gradient(135deg, var(--primary), #00a0c8);
      border-radius: 8px;
      display: flex; align-items: center; justify-content: center;
      font-size: .9rem; color: #fff;
    }

    .nav-links {
      list-style: none;
      display: flex; gap: 30px;
    }

    .nav-links a {
      color: var(--muted); font-size: .9rem; font-weight: 600;
      transition: color .2s;
      font-family: 'Montserrat', sans-serif;
    }

    .nav-links a:hover { color: var(--primary); }

    .nav-cta {
      background: var(--primary); color: #0b1120 !important;
      padding: 8px 20px; border-radius: 50px;
      transition: background .2s, transform .2s !important;
    }

    .nav-cta:hover { background: var(--primary-d) !important; transform: scale(1.04); }

    .hamburger {
      display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px;
    }
    .hamburger span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

    /* ─────────────────── HERO ─────────────────── */
    #hero {
      min-height: 100vh;
      display: flex; align-items: center; justify-content: center;
      position: relative; overflow: hidden;
      padding: 120px 20px 80px;
      background: radial-gradient(ellipse at 60% 40%, #0f2d4a 0%, #0b1120 70%);
    }

    /* Animated mountain silhouette */
    #hero::before {
      content: '';
      position: absolute; bottom: 0; left: 0; right: 0; height: 55%;
      background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%230f1e30' d='M0,320 L0,180 L80,140 L160,200 L240,100 L320,160 L400,60 L500,130 L580,80 L660,150 L740,40 L840,110 L920,30 L1020,100 L1100,50 L1200,120 L1280,70 L1360,130 L1440,90 L1440,320 Z'/%3E%3C/svg%3E") bottom/cover no-repeat;
      opacity: .7;
    }

    #hero::after {
      content: '';
      position: absolute; bottom: 0; left: 0; right: 0; height: 35%;
      background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 200'%3E%3Cpath fill='%230b1120' d='M0,200 L0,120 L120,150 L240,90 L360,140 L480,80 L600,130 L720,70 L840,120 L960,60 L1080,110 L1200,50 L1320,100 L1440,60 L1440,200 Z'/%3E%3C/svg%3E") bottom/cover no-repeat;
    }

    /* Floating particles */
    .particles { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
    .particle {
      position: absolute; border-radius: 50%;
      background: var(--primary); opacity: .12;
      animation: float linear infinite;
    }

    @keyframes float {
      0%   { transform: translateY(100vh) rotate(0deg); opacity: 0; }
      10%  { opacity: .12; }
      90%  { opacity: .12; }
      100% { transform: translateY(-20px) rotate(720deg); opacity: 0; }
    }

    .hero-content {
      position: relative; z-index: 2;
      text-align: center; max-width: 760px;
    }

    .hero-badge {
      display: inline-flex; align-items: center; gap: 8px;
      background: rgba(0,212,160,.12); border: 1px solid var(--border);
      color: var(--primary); font-size: .8rem; font-weight: 700;
      padding: 6px 16px; border-radius: 50px;
      margin-bottom: 28px; letter-spacing: .08em; text-transform: uppercase;
      font-family: 'Montserrat', sans-serif;
    }

    .hero-title {
      font-size: clamp(2.2rem, 6vw, 4rem);
      font-weight: 900; line-height: 1.1;
      margin-bottom: 20px;
    }

    .hero-title .highlight {
      background: linear-gradient(90deg, var(--primary), #00a0c8);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    }

    .hero-sub {
      color: var(--muted); font-size: 1.1rem; max-width: 90%; margin: 0 auto 36px;
    }

    .hero-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

    .btn {
      display: inline-flex; align-items: center; gap: 9px;
      padding: 14px 30px; border-radius: 50px; font-weight: 700;
      font-family: 'Montserrat', sans-serif; font-size: .95rem;
      cursor: pointer; transition: transform .2s, box-shadow .2s;
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #00a0c8);
      color: #0b1120;
      box-shadow: 0 4px 20px rgba(0,212,160,.35);
    }

    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,160,.45); color: #0b1120; }

    .btn-outline {
      background: transparent; color: var(--text);
      border: 2px solid rgba(255,255,255,.2);
    }

    .btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

    /* 3D map mockup */
    .hero-visual {
      position: relative; z-index: 2;
 display: flex; justify-content: center;
    }

    .map3d-wrap {
      width: 400px; height: 200px;
      perspective: 900px;
    }

    .map3d {
      width: 100%; height: 100%;
      transform: rotateX(30deg) rotateZ(-8deg);
      transform-style: preserve-3d;
      animation: mapFloat 4s ease-in-out infinite;
      position: relative;
    }

    @keyframes mapFloat {
      0%, 100% { transform: rotateX(30deg) rotateZ(-8deg) translateY(0); }
      50%       { transform: rotateX(28deg) rotateZ(-6deg) translateY(-10px); }
    }

    .map3d svg { width: 100%; height: 100%; border-radius: 12px; box-shadow: 0 20px 60px rgba(0,0,0,.7); }

    /* Stats strip */
    .hero-stats {
      position: relative; z-index: 2;
      display: flex; gap: 0; justify-content: center; flex-wrap: wrap;
      margin-top: 50px;
    }

    .stat {
      padding: 18px 36px; text-align: center;
      border-right: 1px solid rgba(255,255,255,.08);
    }
    .stat:last-child { border-right: none; }

    .stat-num {
      font-family: 'Montserrat', sans-serif; font-weight: 900; font-size: 1.9rem;
      color: var(--primary);
    }

    .stat-label { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; }

    /* ─────────────────── SECTION TITLES ─────────────────── */
    .section-tag {
      display: inline-block;
      background: rgba(0,212,160,.1); border: 1px solid var(--border);
      color: var(--primary); font-size: .75rem; font-weight: 700;
      padding: 5px 14px; border-radius: 50px; margin-bottom: 14px;
      text-transform: uppercase; letter-spacing: .08em;
      font-family: 'Montserrat', sans-serif;
    }

    .section-title {
      font-size: clamp(1.7rem, 4vw, 2.5rem);
      font-weight: 900; margin-bottom: 14px;
    }

    .section-sub { color: var(--muted); max-width: 540px; font-size: 1rem; }

    .text-center { text-align: center; }
    .mx-auto { margin-left: auto; margin-right: auto; }

    /* ─────────────────── HOW IT WORKS ─────────────────── */
    #how {
      background: var(--bg2);
      position: relative;
    }

    #how::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
    }

    .steps-grid {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 28px; margin-top: 56px;
      position: relative;
    }

    .steps-grid::before {
      content: '';
      position: absolute; top: 54px; left: 10%; right: 10%; height: 2px;
      background: linear-gradient(90deg, transparent, var(--border), var(--primary), var(--border), transparent);
    }

    .step-card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px 28px;
      text-align: center;
      position: relative;
      transition: transform .3s, box-shadow .3s;
    }

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

    .step-num {
      position: absolute; top: -18px; left: 50%; transform: translateX(-50%);
      width: 36px; height: 36px; border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), #00a0c8);
      color: #0b1120; font-weight: 900; font-size: .9rem;
      display: flex; align-items: center; justify-content: center;
      font-family: 'Montserrat', sans-serif;
      box-shadow: 0 0 0 4px var(--bg2);
    }

    .step-icon {
      width: 72px; height: 72px; border-radius: 50%;
      background: rgba(0,212,160,.1);
      display: flex; align-items: center; justify-content: center;
      margin: 0 auto 20px;
      font-size: 1.8rem; color: var(--primary);
    }

    .step-card h3 { font-size: 1.1rem; margin-bottom: 10px; font-weight: 700; }
    .step-card p { color: var(--muted); font-size: .9rem; }

    /* ─────────────────── UPLOAD DEMO ─────────────────── */
    #demo {
      background: var(--bg3);
    }

    .demo-grid {
      display: grid; grid-template-columns: 1fr 1fr;
      gap: 48px; align-items: center; margin-top: 56px;
    }

    .upload-zone {
      border: 2px dashed var(--border);
      border-radius: var(--radius);
      padding: 50px 30px;
      text-align: center;
      cursor: pointer;
      transition: border-color .3s, background .3s;
      background: rgba(0,212,160,.03);
    }

    .upload-zone:hover { border-color: var(--primary); background: rgba(0,212,160,.07); }

    .upload-zone i { font-size: 2.5rem; color: var(--primary); margin-bottom: 16px; }
    .upload-zone h3 { font-size: 1.1rem; margin-bottom: 8px; }
    .upload-zone p { color: var(--muted); font-size: .85rem; margin-bottom: 20px; }

    .upload-formats { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 12px; }
    .format-pill {
      background: rgba(0,212,160,.1); border: 1px solid var(--border);
      color: var(--primary); padding: 3px 12px; border-radius: 50px; font-size: .75rem; font-weight: 600;
    }

    .preview-box {
      background: var(--card); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 0; overflow: hidden;
    }

    /* ── Viewer 3D état vide / erreur ── */
    #viewer-empty, #viewer-loading, #viewer-error {
      padding: 24px;
    }

    /* Canvas Three.js pleine largeur */
    #viewer-mount canvas {
      display: block;
      width: 100% !important;
      height: 100% !important;
    }

    /* Spin animation pour le loader */
    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    /* Boutons de sélection de fond de carte */
    .layer-btn {
      background: transparent;
      border: 1px solid rgba(255,255,255,.15);
      color: #94a3b8;
      font-size: .7rem;
      padding: 4px 8px;
      border-radius: 5px;
      cursor: pointer;
      transition: background .15s, color .15s, border-color .15s;
      white-space: nowrap;
    }
    .layer-btn:hover {
      background: rgba(0,212,160,.12);
      border-color: var(--primary);
      color: var(--primary);
    }
    .layer-btn.active {
      background: var(--primary);
      border-color: var(--primary);
      color: #0b1120;
      font-weight: 600;
    }

    .preview-box h3 { font-size: 1rem; margin-bottom: 18px; color: var(--muted); }

    .trail-svg-wrap { perspective: 600px; }
    .trail-svg-inner {
      transform: rotateX(20deg) rotateZ(-5deg);
      animation: mapFloat2 5s ease-in-out infinite;
    }
    @keyframes mapFloat2 {
      0%, 100% { transform: rotateX(20deg) rotateZ(-5deg) translateY(0); }
      50%       { transform: rotateX(18deg) rotateZ(-3deg) translateY(-8px); }
    }

    .color-selector { margin-top: 20px; }
    .color-selector label { font-size: .85rem; color: var(--muted); margin-bottom: 10px; display: block; }
    .color-dots { display: flex; gap: 10px; }
    .color-dot {
      width: 28px; height: 28px; border-radius: 50%; cursor: pointer;
      border: 3px solid transparent; transition: transform .2s, border-color .2s;
    }
    .color-dot:hover, .color-dot.active { transform: scale(1.2); border-color: #fff; }

    /* ─────────────────── PRICING ─────────────────── */
    #pricing {
      background: var(--bg2);
    }

    .pricing-grid {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px; margin-top: 56px;
      align-items: start;
    }

    .price-card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 38px 30px;
      text-align: center;
      position: relative;
      transition: transform .3s, box-shadow .3s;
    }

    .price-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }

    .price-card.featured {
      background: linear-gradient(160deg, #0f2d4a, #163555);
      border-color: var(--primary);
      box-shadow: 0 0 0 1px var(--primary), var(--shadow);
    }

    .popular-badge {
      position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
      background: linear-gradient(135deg, var(--primary), #00a0c8);
      color: #0b1120; font-weight: 800; font-size: .75rem;
      padding: 5px 18px; border-radius: 50px; white-space: nowrap;
      font-family: 'Montserrat', sans-serif; text-transform: uppercase; letter-spacing: .05em;
    }

    .price-icon {
      font-size: 2.2rem; margin-bottom: 14px;
    }

    .price-size-label {
      font-weight: 700; font-size: 1.1rem; margin-bottom: 4px;
    }

    .price-dims {
      color: var(--muted); font-size: .85rem; margin-bottom: 20px;
      display: flex; align-items: center; justify-content: center; gap: 6px;
    }

    .price-amount {
      font-family: 'Montserrat', sans-serif; font-weight: 900; font-size: 3rem;
      line-height: 1; margin-bottom: 4px;
      background: linear-gradient(135deg, var(--primary), #00a0c8);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    }

    .price-per { color: var(--muted); font-size: .82rem; margin-bottom: 28px; }

    .price-features { list-style: none; text-align: left; margin-bottom: 28px; }

    .price-features li {
      display: flex; align-items: flex-start; gap: 10px;
      padding: 8px 0; border-bottom: 1px solid rgba(255,255,255,.05);
      font-size: .9rem;
    }

    .price-features li:last-child { border-bottom: none; }

    .price-features li i { color: var(--primary); margin-top: 3px; font-size: .85rem; flex-shrink: 0; }

    .price-size-viz {
      display: flex; align-items: flex-end; justify-content: center; gap: 6px; margin-bottom: 20px;
    }

    .size-box {
      background: rgba(0,212,160,.15);
      border: 1px solid var(--primary);
      border-radius: 4px;
    }

    /* ─────────────────── COLORS SECTION ─────────────────── */
    #colors {
      background: var(--bg3);
    }

    .colors-grid {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px; margin-top: 48px;
    }

    .color-card {
      background: var(--card); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 24px; text-align: center;
      transition: transform .3s;
    }

    .color-card:hover { transform: translateY(-4px); }

    .color-swatches {
      display: flex; justify-content: center; gap: 6px; margin-bottom: 14px;
      flex-wrap: wrap;
    }

    .swatch {
      width: 32px; height: 32px; border-radius: 50%;
      box-shadow: 0 2px 8px rgba(0,0,0,.4);
    }

    .color-card h3 { font-size: 1rem; margin-bottom: 6px; }
    .color-card p { color: var(--muted); font-size: .82rem; }

    /* ─────────────────── TESTIMONIALS ─────────────────── */
    #testimonials { background: var(--bg2); }

    .testimonials-grid {
      display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px; margin-top: 48px;
    }

    .testimonial-card {
      background: var(--card); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 28px;
      position: relative;
    }

    .quote-mark {
      font-size: 4rem; line-height: 1; color: var(--primary); opacity: .3;
      font-family: serif; position: absolute; top: 14px; right: 20px;
    }

    .stars { color: #f59e0b; font-size: .85rem; margin-bottom: 12px; }
    .testimonial-card p { font-size: .93rem; color: var(--muted); font-style: italic; margin-bottom: 18px; }

    .testi-author { display: flex; align-items: center; gap: 12px; }

    .testi-avatar {
      width: 42px; height: 42px; border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), #00a0c8);
      display: flex; align-items: center; justify-content: center;
      font-weight: 700; color: #0b1120; font-size: .9rem;
      flex-shrink: 0;
    }

    .testi-name { font-weight: 700; font-size: .9rem; }
    .testi-meta { color: var(--muted); font-size: .8rem; }

    /* ─────────────────── CONTACT ─────────────────── */
    #contact {
      background: var(--bg3);
    }

    #contact::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, transparent, var(--accent), transparent);
    }

    #contact { position: relative; }

    .contact-grid {
      display: grid; grid-template-columns: 1fr 1.6fr;
      gap: 56px; align-items: start; margin-top: 56px;
    }

    .contact-info h3 { font-size: 1.3rem; margin-bottom: 20px; }

    .contact-item {
      display: flex; align-items: flex-start; gap: 14px;
      margin-bottom: 22px;
    }

    .contact-item-icon {
      width: 44px; height: 44px; border-radius: 10px;
      background: rgba(0,212,160,.1); border: 1px solid var(--border);
      display: flex; align-items: center; justify-content: center;
      color: var(--primary); font-size: 1rem; flex-shrink: 0;
    }

    .contact-item-text h4 { font-size: .92rem; margin-bottom: 3px; }
    .contact-item-text span { color: var(--muted); font-size: .86rem; }

    .contact-form {
      background: var(--card); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 38px;
    }

    .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

    .form-group { margin-bottom: 18px; }

    .form-group label {
      display: block; font-size: .85rem; font-weight: 600;
      margin-bottom: 7px; color: var(--muted);
      font-family: 'Montserrat', sans-serif;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%; padding: 12px 16px;
      background: rgba(255,255,255,.05);
      border: 1px solid rgba(255,255,255,.1);
      border-radius: 8px; color: var(--text);
      font-family: 'Open Sans', sans-serif; font-size: .92rem;
      transition: border-color .2s, background .2s;
      outline: none;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      background: rgba(0,212,160,.05);
    }

    .form-group select option { background: var(--card); }

    .form-group textarea { resize: vertical; min-height: 120px; }

    .form-notice {
      font-size: .8rem; color: var(--muted);
      margin-bottom: 18px; display: flex; align-items: flex-start; gap: 8px;
    }

    .form-notice i { color: var(--primary); margin-top: 1px; }

    .btn-submit {
      width: 100%; padding: 14px;
      background: linear-gradient(135deg, var(--accent), var(--accent-d));
      color: #fff; border: none; border-radius: 50px;
      font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 1rem;
      cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 10px;
      transition: transform .2s, box-shadow .2s;
      box-shadow: 0 4px 20px rgba(255,107,53,.3);
    }

    .btn-submit:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,53,.45); }
    .btn-submit:disabled { opacity: .6; cursor: not-allowed; transform: none; }

    #form-message {
      margin-top: 14px; padding: 12px 16px;
      border-radius: 8px; font-size: .88rem; font-weight: 600;
      display: none;
    }

    #form-message.success {
      background: rgba(0,212,160,.12); border: 1px solid var(--primary); color: var(--primary);
      display: flex; align-items: center; gap: 10px;
    }

    #form-message.error {
      background: rgba(255,107,53,.12); border: 1px solid var(--accent); color: var(--accent);
      display: flex; align-items: center; gap: 10px;
    }

    /* ─────────────────── FOOTER ─────────────────── */
    footer {
      background: #080d18;
      border-top: 1px solid rgba(255,255,255,.05);
      padding: 48px 20px 24px;
    }

    .footer-inner {
      max-width: 1100px; margin: 0 auto;
      display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px;
      padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.05);
    }

    .footer-brand p { color: var(--muted); font-size: .88rem; margin-top: 14px; max-width: 280px; }

    .footer-socials { display: flex; gap: 10px; margin-top: 20px; }

    .social-link {
      width: 36px; height: 36px; border-radius: 8px;
      background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
      display: flex; align-items: center; justify-content: center;
      color: var(--muted); font-size: .9rem; transition: background .2s, color .2s;
    }

    .social-link:hover { background: var(--primary); color: #0b1120; }

    .footer-col h4 {
      font-size: .88rem; color: var(--text); margin-bottom: 16px;
      text-transform: uppercase; letter-spacing: .06em;
    }

    .footer-col ul { list-style: none; }

    .footer-col ul li { margin-bottom: 10px; }

    .footer-col ul li a {
      color: var(--muted); font-size: .86rem; transition: color .2s;
    }

    .footer-col ul li a:hover { color: var(--primary); }

    .footer-bottom {
      max-width: 1100px; margin: 24px auto 0;
      display: flex; align-items: center; justify-content: space-between;
      flex-wrap: wrap; gap: 12px;
    }

    .footer-bottom p { color: var(--muted); font-size: .8rem; }

    /* ─────────────────── SCROLL ANIMATIONS ─────────────────── */
    .fade-in {
      opacity: 0; transform: translateY(30px);
      transition: opacity .6s ease, transform .6s ease;
    }

    .fade-in.visible { opacity: 1; transform: translateY(0); }

    /* ─────────────────── RESPONSIVE ─────────────────── */
    @media (max-width: 900px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .nav-links.open {
        display: flex; flex-direction: column; gap: 0;
        position: fixed; top: 64px; left: 0; right: 0;
        background: rgba(11,17,32,.97);
        padding: 12px 0; border-bottom: 1px solid var(--border);
      }
      .nav-links.open a { padding: 14px 28px; }

      .demo-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr 1fr; }
      .form-row { grid-template-columns: 1fr; }
      .steps-grid::before { display: none; }
    }

    @media (max-width: 600px) {
      section { padding: 60px 16px; }
      .hero-stats { flex-direction: column; gap: 0; }
      .stat { border-right: none; border-bottom: 1px solid rgba(255,255,255,.08); }
      .footer-inner { grid-template-columns: 1fr; gap: 32px; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .contact-form { padding: 24px 18px; }
    }

    /* ─────────────────── TOPLINE GRADIENT ─────────────────── */
    .topline {
      position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 2000;
      background: linear-gradient(90deg, var(--primary), #00a0c8, var(--accent));
    }