:root {
      --bg: #080c12;
      --surface: #0d1420;
      --surface2: #111b2e;
      --accent: #00f5c4;
      --accent2: #7c3aed;
      --accent3: #f59e0b;
      --text: #e2e8f0;
      --muted: #64748b;
      --border: rgba(255,255,255,0.07);
      --glow: 0 0 30px rgba(0,245,196,0.15);
    }

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

    html { scroll-behavior: smooth; }

    body {
      font-family: 'DM Mono', monospace;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
    }

    /* Animated grid background */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image:
        linear-gradient(rgba(0,245,196,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,245,196,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      z-index: 0;
      pointer-events: none;
    }

    /* Ambient orb */
    body::after {
      content: '';
      position: fixed;
      top: -200px;
      right: -200px;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(124,58,237,0.12) 0%, transparent 70%);
      z-index: 0;
      pointer-events: none;
      animation: orbFloat 8s ease-in-out infinite;
    }

    @keyframes orbFloat {
      0%, 100% { transform: translate(0,0) scale(1); }
      50% { transform: translate(-30px, 30px) scale(1.1); }
    }

    /* ── NAVBAR ── */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1000;
      padding: 0 40px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: rgba(8,12,18,0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
    }

    .navbar-brand {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: 1.1rem;
      letter-spacing: 0.05em;
      color: var(--accent);
      text-shadow: 0 0 20px rgba(0,245,196,0.4);
    }

    .navbar-brand span {
      color: var(--text);
      opacity: 0.5;
    }

    .nav-pill {
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: 100px;
      padding: 6px 16px;
      font-size: 0.7rem;
      color: var(--accent);
      letter-spacing: 0.1em;
      text-transform: uppercase;
    }

    /* ── MAIN CONTAINER ── */
    .container {
      position: relative;
      z-index: 1;
      max-width: 860px;
      width: 90%;
      margin: 0 auto;
      padding-top: 100px;
      padding-bottom: 80px;
    }

    /* ── HERO SECTION ── */
    .hero {
      text-align: center;
      padding: 60px 0 40px;
      animation: fadeUp 0.8s ease both;
    }

    .hero-tag {
      display: inline-block;
      font-size: 0.65rem;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--accent);
      border: 1px solid rgba(0,245,196,0.3);
      border-radius: 100px;
      padding: 5px 14px;
      margin-bottom: 24px;
    }

    .hero h1 {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: clamp(2.4rem, 6vw, 4rem);
      line-height: 1.1;
      background: linear-gradient(135deg, #ffffff 30%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 16px;
    }

    .hero p {
      color: var(--muted);
      font-size: 0.85rem;
      max-width: 460px;
      margin: 0 auto;
      line-height: 1.8;
    }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ── SECTION CARD ── */
    /* Each section is a card panel. Keep overflow visible so nested sticky elements can work. */
    .section {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 28px 32px;
      margin-bottom: 20px;
      position: relative;
      /* overflow hidden was preventing sticky child from pinning in some browsers. */
      overflow: visible;
      transition: border-color 0.3s, box-shadow 0.3s;
      animation: fadeUp 0.8s ease both;
    }

    .section:hover {
      border-color: rgba(0,245,196,0.25);
      box-shadow: var(--glow);
    }

    /* Accent line on left */
    .section::before {
      content: '';
      position: absolute;
      left: 0;
      top: 20%;
      bottom: 20%;
      width: 2px;
      background: linear-gradient(to bottom, transparent, var(--accent), transparent);
      opacity: 0;
      transition: opacity 0.3s;
    }

    .section:hover::before { opacity: 1; }

    .section-label {
      font-size: 0.6rem;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 10px;
      opacity: 0.7;
    }

    .section h2 {
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 1.5rem;
      color: #fff;
      margin-bottom: 8px;
    }

    .section h3 {
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text);
      margin-bottom: 12px;
    }

    .section p {
      color: var(--muted);
      font-size: 0.8rem;
      line-height: 1.8;
    }

    /* ── STICKY TITLE ── */
    .sticky-title {
      position: sticky;
      top: 74px;
      font-family: 'Syne', sans-serif;
      font-size: 0.8rem;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--bg);
      background: var(--accent);
      display: inline-block;
      padding: 6px 14px;
      border-radius: 6px;
      margin-bottom: 16px;
      z-index: 10;
    }

    .spacer { height: 260px; }

    /* ── INPUT ── */
    .input-wrap {
      position: relative;
      margin-top: 8px;
    }

    .input-wrap label {
      display: block;
      font-size: 0.65rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: 8px;
    }

    input[type="text"] {
      width: 100%;
      padding: 14px 18px;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 10px;
      color: var(--text);
      font-family: 'DM Mono', monospace;
      font-size: 0.85rem;
      transition: border-color 0.25s, box-shadow 0.25s;
      outline: none;
    }

    input[type="text"]::placeholder { color: var(--muted); opacity: 0.5; }

    input[type="text"]:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0,245,196,0.1);
    }

    /* ── IFRAME ── */
    .iframe-wrap {
      margin-top: 12px;
      border-radius: 10px;
      overflow: hidden;
      border: 1px solid var(--border);
      background: var(--bg);
    }

    .iframe-bar {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 10px 14px;
      background: var(--surface2);
      border-bottom: 1px solid var(--border);
    }

    .iframe-dot {
      width: 10px; height: 10px;
      border-radius: 50%;
    }
    .d1 { background: #ff5f57; }
    .d2 { background: #ffbd2e; }
    .d3 { background: #27c93f; }

    .iframe-url {
      font-size: 0.65rem;
      color: var(--muted);
      margin-left: 8px;
    }

    iframe {
      width: 100%;
      height: 180px;
      border: none;
      display: block;
    }

    /* ── TABLE ── */
    .table-wrap { margin-top: 12px; overflow: hidden; border-radius: 10px; border: 1px solid var(--border); }

    table { width: 100%; border-collapse: collapse; }

    thead { background: var(--surface2); }

    th {
      padding: 12px 18px;
      text-align: left;
      font-size: 0.65rem;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--accent);
      border-bottom: 1px solid var(--border);
    }

    td {
      padding: 12px 18px;
      font-size: 0.8rem;
      color: var(--muted);
      border-bottom: 1px solid var(--border);
      transition: background 0.2s;
    }

    tr:last-child td { border-bottom: none; }
    tr:hover td { background: rgba(255,255,255,0.03); color: var(--text); }

    /* ── BOXES (Margin Collapse) ── */
    .boxes-demo { margin-top: 12px; }

    .box1, .box2 {
      padding: 16px 20px;
      border-radius: 8px;
      font-size: 0.78rem;
      font-family: 'DM Mono', monospace;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .box1 {
      background: linear-gradient(135deg, rgba(239,68,68,0.15), rgba(239,68,68,0.05));
      border: 1px solid rgba(239,68,68,0.3);
      color: #fca5a5;
      margin-bottom: 50px;
    }

    .box2 {
      background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(99,102,241,0.05));
      border: 1px solid rgba(99,102,241,0.3);
      color: #a5b4fc;
      margin-top: 30px;
    }

    .box-icon {
      width: 8px; height: 8px;
      border-radius: 50%;
      flex-shrink: 0;
    }
    .box1 .box-icon { background: #ef4444; }
    .box2 .box-icon { background: #6366f1; }

    .badge {
      margin-left: auto;
      font-size: 0.55rem;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      padding: 3px 8px;
      border-radius: 100px;
      border: 1px solid currentColor;
      opacity: 0.6;
    }

    /* ── POSITION RELATIVE ── */
    .pos-demo { margin-top: 12px; position: relative; }

    .box3, .box4 {
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
      font-family: 'DM Mono', monospace;
      font-weight: 500;
      height: 80px;
      transition: transform 0.3s;
    }

    .box3 {
      background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(245,158,11,0.05));
      border: 1px solid rgba(245,158,11,0.35);
      color: #fcd34d;
    }

    .box4 {
      background: linear-gradient(135deg, rgba(0,245,196,0.15), rgba(0,245,196,0.03));
      border: 1px solid rgba(0,245,196,0.25);
      color: var(--accent);
      position: relative;
      top: 24px;
    }

    .box3:hover { transform: scale(1.02); }
    .box4:hover { transform: scale(1.02) translateX(4px); }

    .demo-btn {
      display: inline-block;
      margin-top: 12px;
      padding: 10px 16px;
      border-radius: 10px;
      background: linear-gradient(135deg, #00f5c4, #7c3aed);
      color: #0b1120;
      font-weight: 700;
      text-decoration: none;
      border: 1px solid rgba(255,255,255,0.2);
      box-shadow: 0 0 0 0 rgba(0,245,196,0.2);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .demo-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,245,196,0.2); }

    /* ── STAGGER ANIMATION ── */
    .section:nth-child(1) { animation-delay: 0.05s; }
    .section:nth-child(2) { animation-delay: 0.1s; }
    .section:nth-child(3) { animation-delay: 0.15s; }
    .section:nth-child(4) { animation-delay: 0.2s; }
    .section:nth-child(5) { animation-delay: 0.25s; }
    .section:nth-child(6) { animation-delay: 0.3s; }
    .section:nth-child(7) { animation-delay: 0.35s; }