:root {
      --bg-deep: #0a0f1a;
      --bg-surface: #111827;
      --bg-elevated: #1e293b;
      --bg-card: #162032;
      --blue-500: #3b82f6;
      --blue-600: #2563eb;
      --blue-700: #1d4ed8;
      --cyan-400: #22d3ee;
      --cyan-500: #06b6d4;
      --green-400: #4ade80;
      --amber-400: #fbbf24;
      --text-primary: #f1f5f9;
      --text-secondary: #94a3b8;
      --text-muted: #64748b;
      --border: rgba(148, 163, 184, 0.1);
      --border-strong: rgba(148, 163, 184, 0.2);
    }

    *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--bg-deep); color: var(--text-primary);
      line-height: 1.6; overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    code, .mono { font-family: 'JetBrains Mono', monospace; }

    /* ── NAV ── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: rgba(10, 15, 26, 0.85);
      backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
    }
    .nav-inner {
      display: flex; align-items: center; justify-content: space-between;
      max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 64px;
    }
    .nav-logo {
      font-size: 1.25rem; font-weight: 700; letter-spacing: -0.025em;
      display: flex; align-items: center; gap: 10px;
    }
    .nav-logo svg { width: 28px; height: 28px; }
    .nav-links { display: flex; gap: 32px; align-items: center; }
    .nav-links a { font-size: 0.875rem; font-weight: 500; color: var(--text-secondary); transition: color 0.2s; }
    .nav-links a:hover { color: var(--text-primary); }
    .nav-cta {
      background: var(--blue-600); color: #fff !important;
      padding: 8px 20px; border-radius: 8px; font-weight: 600;
      font-size: 0.875rem; transition: all 0.2s;
    }
    .nav-cta:hover { background: var(--blue-500); transform: translateY(-1px); }
    .nav-mobile { display: none; background: none; border: none; color: var(--text-primary); cursor: pointer; padding: 8px; }

    /* ── HERO ── */
    .hero {
      position: relative; padding: 140px 0 80px; overflow: hidden;
    }
    .hero-bg {
      position: absolute; inset: 0; z-index: 0;
      background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(59,130,246,0.15) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 20%, rgba(6,182,212,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      position: absolute; inset: 0; z-index: 0;
      background-image:
        linear-gradient(rgba(148,163,184,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148,163,184,0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      mask-image: radial-gradient(ellipse 70% 50% at 50% 30%, black 20%, transparent 70%);
    }
    .hero-content { position: relative; z-index: 1; text-align: center; }
    .hero-badge {
      display: inline-flex; align-items: center; gap: 8px;
      background: var(--bg-elevated); border: 1px solid var(--border);
      padding: 6px 16px; border-radius: 100px; font-size: 0.8rem;
      color: var(--text-secondary); margin-bottom: 28px;
    }
    .hero-badge-dot { width: 6px; height: 6px; border-radius: 50%; background: #22c55e; animation: pulse-dot 2s infinite; }
    @keyframes pulse-dot { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
    .hero h1 {
      font-size: clamp(2.5rem, 5.5vw, 4rem); font-weight: 800;
      letter-spacing: -0.035em; line-height: 1.1; margin-bottom: 20px;
    }
    .hero h1 .gradient {
      background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    }
    .hero > .container > p {
      font-size: clamp(1rem, 1.8vw, 1.2rem); color: var(--text-secondary);
      max-width: 640px; margin: 0 auto 36px; line-height: 1.7;
    }
    .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px; }
    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 14px 28px; border-radius: 10px; font-weight: 600;
      font-size: 0.95rem; transition: all 0.25s; border: none; cursor: pointer;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--blue-600), var(--blue-700));
      color: #fff; box-shadow: 0 4px 20px rgba(59,130,246,0.3);
    }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(59,130,246,0.4); }
    .btn-outline { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
    .btn-outline:hover { color: var(--text-primary); border-color: var(--text-muted); background: rgba(255,255,255,0.03); }

    /* ── ARCHITECTURE DIAGRAM ── */
    .arch {
      max-width: 900px; margin: 0 auto; padding: 40px 32px;
      background: var(--bg-surface); border: 1px solid var(--border);
      border-radius: 16px; position: relative; z-index: 1;
    }
    .arch-label {
      text-align: center; font-size: 0.7rem; text-transform: uppercase;
      letter-spacing: 0.15em; color: var(--text-muted); margin-bottom: 28px;
    }
    .arch-flow {
      display: grid; grid-template-columns: 1fr auto 1fr auto 1fr;
      align-items: center; gap: 0;
    }
    .arch-col { display: flex; flex-direction: column; gap: 8px; }
    .arch-box {
      padding: 10px 16px; border-radius: 8px; font-size: 0.78rem;
      font-weight: 500; border: 1px solid var(--border); text-align: center;
      white-space: nowrap;
    }
    .arch-legacy { background: rgba(251, 191, 36, 0.08); border-color: rgba(251, 191, 36, 0.25); color: var(--amber-400); }
    .arch-core { background: rgba(59, 130, 246, 0.12); border-color: rgba(59, 130, 246, 0.35); color: var(--blue-500); font-weight: 700; }
    .arch-modern { background: rgba(74, 222, 128, 0.08); border-color: rgba(74, 222, 128, 0.25); color: var(--green-400); }
    .arch-arrow {
      display: flex; align-items: center; justify-content: center;
      padding: 0 12px; color: var(--text-muted); font-size: 1.5rem;
    }
    .arch-center-label {
      font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.12em;
      color: var(--text-muted); text-align: center; margin-top: 6px;
    }

    /* ── LOGOS ── */
    .logos { padding: 56px 0; border-bottom: 1px solid var(--border); }
    .logos-label {
      text-align: center; font-size: 0.75rem; text-transform: uppercase;
      letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 28px;
    }
    .logos-row { display: flex; align-items: center; justify-content: center; gap: 48px; flex-wrap: wrap; opacity: 0.4; }
    .logos-row span { font-size: 1.05rem; font-weight: 700; letter-spacing: 0.05em; color: var(--text-secondary); white-space: nowrap; }

    /* ── SECTIONS ── */
    section { padding: 100px 0; }
    .section-label { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--blue-500); font-weight: 600; margin-bottom: 12px; }
    .section-title { font-size: clamp(1.75rem, 4vw, 2.75rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 16px; }
    .section-desc { font-size: 1.05rem; color: var(--text-secondary); max-width: 580px; line-height: 1.7; }
    .section-header { text-align: center; margin-bottom: 64px; }
    .section-header .section-desc { margin: 0 auto; }

    /* ── WHAT IT CONNECTS / EXPOSES / GUARANTEES ── */
    .pillars-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .pillar {
      background: var(--bg-card); border: 1px solid var(--border);
      border-radius: 16px; padding: 36px;
      transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    .pillar:hover {
      transform: translateY(-4px); border-color: rgba(59,130,246,0.3);
      box-shadow: 0 16px 48px rgba(0,0,0,0.3), 0 0 0 1px rgba(59,130,246,0.1);
    }
    .pillar-icon {
      width: 48px; height: 48px; border-radius: 12px;
      display: flex; align-items: center; justify-content: center;
      margin-bottom: 20px;
    }
    .pillar-icon.amber { background: rgba(251,191,36,0.1); border: 1px solid rgba(251,191,36,0.2); }
    .pillar-icon.blue { background: rgba(59,130,246,0.12); border: 1px solid rgba(59,130,246,0.2); }
    .pillar-icon.green { background: rgba(74,222,128,0.1); border: 1px solid rgba(74,222,128,0.2); }
    .pillar h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
    .pillar p { font-size: 0.925rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 16px; }
    .pillar-tags { display: flex; flex-wrap: wrap; gap: 6px; }
    .pillar-tag {
      font-size: 0.7rem; font-family: 'JetBrains Mono', monospace;
      padding: 3px 10px; border-radius: 4px;
      background: rgba(255,255,255,0.04); border: 1px solid var(--border);
      color: var(--text-muted);
    }

    /* ── HOW IT WORKS ── */
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
    .steps::before {
      content: ''; position: absolute; top: 36px; left: 12%; right: 12%;
      height: 2px; background: linear-gradient(90deg, var(--blue-600), var(--cyan-500));
      opacity: 0.25;
    }
    .step { text-align: center; position: relative; }
    .step-num {
      width: 72px; height: 72px; border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-size: 1.5rem; font-weight: 800; margin: 0 auto 20px;
      background: var(--bg-elevated); border: 2px solid var(--blue-600);
      color: var(--blue-500); position: relative; z-index: 1;
    }
    .step h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
    .step p { font-size: 0.85rem; color: var(--text-secondary); max-width: 240px; margin: 0 auto; }
    .step code { font-size: 0.72rem; color: var(--cyan-400); background: rgba(6,182,212,0.1); padding: 2px 8px; border-radius: 4px; }

    /* ── FEATURES ── */
    .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .feature { display: flex; gap: 16px; padding: 24px; border-radius: 12px; border: 1px solid transparent; transition: all 0.25s; }
    .feature:hover { background: var(--bg-card); border-color: var(--border); }
    .feature-icon { flex-shrink: 0; color: var(--blue-500); font-size: 1.25rem; margin-top: 2px; }
    .feature h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
    .feature p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

    /* ── STATS ── */
    .stats {
      background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(6,182,212,0.05));
      border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
      padding: 72px 0;
    }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
    .stat-num {
      font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.03em;
      background: linear-gradient(135deg, var(--blue-500), var(--cyan-400));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    }
    .stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

    /* ── CTA ── */
    .cta-section {
      text-align: center; padding: 120px 0;
      background: radial-gradient(ellipse 60% 50% at 50% 100%, rgba(59,130,246,0.1) 0%, transparent 60%);
    }
    .cta-section h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.03em; margin-bottom: 16px; }
    .cta-section p { color: var(--text-secondary); font-size: 1.1rem; max-width: 480px; margin: 0 auto 36px; }
    .cta-form { display: flex; gap: 12px; justify-content: center; max-width: 440px; margin: 0 auto; }
    .cta-form input {
      flex: 1; min-width: 0; padding: 14px 18px; border-radius: 10px;
      border: 1px solid var(--border); background: var(--bg-elevated);
      color: var(--text-primary); font-size: 0.95rem; font-family: inherit;
      outline: none; transition: border-color 0.2s;
    }
    .cta-form input::placeholder { color: var(--text-muted); }
    .cta-form input:focus { border-color: var(--blue-600); }

    /* ── FOOTER ── */
    footer { border-top: 1px solid var(--border); padding: 48px 0; }
    .footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 24px; }
    .footer-brand { font-weight: 700; font-size: 1rem; }
    .footer-links { display: flex; gap: 28px; }
    .footer-links a { font-size: 0.85rem; color: var(--text-muted); transition: color 0.2s; }
    .footer-links a:hover { color: var(--text-secondary); }
    .footer-copy { font-size: 0.8rem; color: var(--text-muted); }

    /* ── REVEAL (progressive enhancement: visible by default, animated only when JS runs) ── */
    .js-reveal .reveal {
      opacity: 0; transform: translateY(24px);
      transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                  transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    .js-reveal .reveal.visible { opacity: 1; transform: translateY(0); }
    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }

    /* ── MOBILE NAV ── */
    .nav-links.open { display: flex !important; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(10, 15, 26, 0.97); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); padding: 16px 24px; border-bottom: 1px solid var(--border); gap: 0; }
    .nav-links.open a { padding: 12px 0; font-size: 1rem; border-bottom: 1px solid var(--border); }
    .nav-links.open a:last-child { border-bottom: none; }

    /* ── RESPONSIVE ── */
    @media (max-width: 900px) {
      .arch-flow { grid-template-columns: 1fr; gap: 12px; }
      .arch-arrow { transform: rotate(90deg); padding: 8px 0; }
      .arch-box { white-space: normal; }
      .pillars-grid, .steps, .features-grid { grid-template-columns: 1fr; }
      .pillar { padding: 24px; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .steps::before { display: none; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .nav-mobile { display: block; }
      .hero { padding: 120px 0 60px; }
      .cta-form { flex-direction: column; }
      .cta-form input { font-size: 1rem; }
      section { padding: 56px 0; }
      .footer-inner { flex-direction: column; text-align: center; }
      .footer-links { flex-wrap: wrap; justify-content: center; gap: 16px; }
      .footer-links a { padding: 6px 4px; }
    }
    @media (max-width: 480px) {
      .stats-grid { grid-template-columns: 1fr; }
      .hero-actions { flex-direction: column; align-items: center; }
    }
    @media (prefers-reduced-motion: reduce) {
      .reveal { transition: none; opacity: 1; transform: none; }
      html { scroll-behavior: auto; }
    }