:root {
      --bg: #0d0d0d;
      --surface: #141414;
      --border: #222;
      --border-active: #444;
      --text: #e8e8e8;
      --muted: #555;
      --accent: #c6f135;
      --accent-dim: rgba(198,241,53,0.08);
      --font-mono: 'JetBrains Mono', monospace;
      --font-sans: 'IBM Plex Sans', sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      background: var(--bg);
      color: var(--text);
      font-family: var(--font-sans);
      font-size: 14px;
      line-height: 1.6;
      min-height: 100vh;
    }
 
    /* TOP BAR */
    .topbar {
      position: fixed; top: 0; left: 0; right: 0;
      height: 48px;
      background: var(--bg);
      border-bottom: 1px solid var(--border);
      display: flex; align-items: center;
      padding: 0 24px;
      z-index: 100;
      gap: 32px;
    }
    .logo {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 15px;
      letter-spacing: -0.5px;
      color: var(--accent);
      text-decoration: none;
    }
    .logo span { color: var(--muted); }
    nav { display: flex; gap: 0; margin-left: auto; }
    nav a {
      font-family: var(--font-mono);
      font-size: 12px;
      color: var(--muted);
      text-decoration: none;
      padding: 0 16px;
      height: 48px;
      display: flex; align-items: center;
      border-left: 1px solid var(--border);
      transition: color 0.15s, background 0.15s;
    }
    nav a:hover { color: var(--text); background: var(--accent-dim); }
    nav a.active { color: var(--accent); }
 
    /* MAIN */
    main {
      padding-top: 48px;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    .hero {
      padding: 80px 24px 64px;
      max-width: 720px;
      margin: 0 auto;
      width: 100%;
    }
    .tag {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--muted);
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 24px;
    }
    h1 {
      font-family: var(--font-mono);
      font-size: clamp(28px, 4vw, 42px);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -1px;
      color: var(--text);
      margin-bottom: 20px;
    }
    h1 .hl { color: var(--accent); }
    .hero p {
      font-size: 15px;
      color: var(--muted);
      max-width: 480px;
      line-height: 1.7;
    }
 
    /* GRID */
    .grid {
      padding: 0 24px 80px;
      max-width: 720px;
      margin: 0 auto;
      width: 100%;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1px;
      background: var(--border);
      border: 1px solid var(--border);
    }
    .card {
      background: var(--bg);
      padding: 28px;
      text-decoration: none;
      color: inherit;
      display: flex;
      flex-direction: column;
      gap: 10px;
      transition: background 0.15s;
      position: relative;
    }
    .card:hover { background: var(--surface); }
    .card:hover .card-arrow { opacity: 1; transform: translate(2px,-2px); }
    .card-num {
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--border-active);
    }
    .card-title {
      font-family: var(--font-mono);
      font-size: 14px;
      font-weight: 500;
      color: var(--text);
    }
    .card-desc {
      font-size: 13px;
      color: var(--muted);
      line-height: 1.6;
    }
    .card-arrow {
      position: absolute; top: 28px; right: 28px;
      color: var(--accent);
      font-size: 18px;
      opacity: 0;
      transition: opacity 0.15s, transform 0.15s;
    }
 
    /* FOOTER */
    footer {
      margin-top: auto;
      border-top: 1px solid var(--border);
      padding: 16px 24px;
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--muted);
      display: flex;
      justify-content: space-between;
    }
 
    /* FOOTER LINKS */
    .footer-links {
      display: flex;
      gap: 0;
    }
    .footer-link {
      display: flex;
      align-items: center;
      gap: 7px;
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--muted);
      text-decoration: none;
      padding: 0 14px;
      border-left: 1px solid var(--border);
      height: 100%;
      transition: color 0.15s, background 0.15s;
    }
    .footer-link:first-child { border-left: none; padding-left: 0; }
    .footer-link:hover { color: var(--text); }
    .footer-link svg { flex-shrink: 0; opacity: 0.7; }
    .footer-link:hover svg { opacity: 1; }