:root {
        --bg: #0f172a;          /* slate-900 */
        --card: #111827;        /* gray-900 */
        --text: #e5e7eb;        /* gray-200 */
        --muted: #94a3b8;       /* slate-400 */
        --accent: #38bdf8;      /* sky-400 */
        --accent-2: #22d3ee;    /* cyan-400 */
        --ring: rgba(56,189,248,.4);
      }
      * { box-sizing: border-box; }
      html { scroll-behavior: smooth; }
      body {
        margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
        background: radial-gradient(1200px 600px at 80% -10%, rgba(56,189,248,.08), transparent),
                    radial-gradient(800px 400px at 10% 10%, rgba(34,211,238,.06), transparent),
                    var(--bg);
        color: var(--text); line-height: 1.6;
      }
      a { color: inherit; text-decoration: none; }
      img { max-width: 100%; display: block; }

      /* Header / Nav */
      header {
        position: sticky; top: 0; z-index: 10;
        backdrop-filter: blur(8px);
        background: rgba(15,23,42,.6);
        border-bottom: 1px solid rgba(148,163,184,.15);
      }
      .nav {
        max-width: 1100px; margin: 0 auto; padding: 14px 20px;
        display: flex; align-items: center; justify-content: space-between;
      }
      .brand { font-weight: 700; letter-spacing: .2px; }
      .brand span { color: var(--accent); }
      .links { display: flex; gap: 16px; }
      .links a { padding: 8px 10px; border-radius: 10px; color: var(--muted); }
      .links a:hover { color: var(--text); background: rgba(148,163,184,.12); }

      /* Sections */
      section { padding: 64px 20px; }
      .container { max-width: 1100px; margin: 0 auto; }
      h1, h2 { line-height: 1.2; margin: 0 0 14px; }
      h1 { font-size: clamp(28px, 4vw, 40px); }
      h2 { font-size: clamp(22px, 3vw, 30px); }
      p.lead { color: var(--muted); max-width: 70ch; }

      /* Card + grid */
      .grid { display: grid; gap: 18px; grid-template-columns: repeat(12, 1fr); }
      .col-12 { grid-column: span 12; }
      .col-6 { grid-column: span 6; }
      .col-4 { grid-column: span 4; }
      @media (max-width: 900px) { .col-6, .col-4 { grid-column: span 12; } }

      .card {
        background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
        border: 1px solid rgba(148,163,184,.12);
        border-radius: 16px; padding: 18px; transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
      }
      .card:hover { transform: translateY(-2px); border-color: rgba(56,189,248,.35); box-shadow: 0 10px 22px -12px rgba(2,132,199,.45); }
      .tag { font-size: 12px; color: var(--accent-2); }

      /* Buttons */
      .btn {
        display: inline-block; padding: 10px 14px; border-radius: 12px; border: 1px solid rgba(148,163,184,.22);
        background: rgba(148,163,184,.08); color: var(--text); font-weight: 600;
      }
      .btn:hover { border-color: var(--accent); box-shadow: 0 0 0 6px var(--ring); }

      /* Footer */
      footer { padding: 40px 20px; color: var(--muted); border-top: 1px solid rgba(148,163,184,.15); }

      /* Contact form */
      form { display: grid; gap: 12px; max-width: 640px; }
      input, textarea {
        width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid rgba(148,163,184,.2);
        background: var(--card); color: var(--text);
      }
      input:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 6px var(--ring); }
      textarea { min-height: 140px; resize: vertical; }
      .muted { color: var(--muted); }