:root{
      --bg: #070A0F;
      --text: rgba(255,255,255,0.92);
      --muted: rgba(255,255,255,0.68);
      --faint: rgba(255,255,255,0.55);
      --border: rgba(255,255,255,0.10);
      --shadow: 0 18px 60px rgba(0,0,0,0.45);
      --radius: 18px;
      --accent: #8AE1FF;
      --accent2: #B2FFDA;
      --panel: rgba(255,255,255,0.04);
    }

    *{ box-sizing:border-box; }
    body{
      margin:0;
      background: radial-gradient(900px 500px at 20% 10%, rgba(138,225,255,0.14), transparent 55%),
                  radial-gradient(700px 420px at 80% 25%, rgba(178,255,218,0.10), transparent 60%),
                  var(--bg);
      color: var(--text);
      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
      line-height: 1.55;
    }
    a{ color: inherit; text-decoration: none; }
    .container{ max-width: 980px; margin: 0 auto; padding: 0 20px; }

    /* Topbar */
    .topbar{
      position: sticky; top: 0;
      backdrop-filter: blur(10px);
      background: rgba(7,10,15,0.65);
      border-bottom: 1px solid var(--border);
      z-index: 50;
    }
    .topbar-inner{
      display:flex; align-items:center; justify-content:space-between;
      padding: 14px 0;
      gap: 12px;
    }
    .brand{
      display:flex; align-items:center; gap: 10px;
      font-weight: 700; letter-spacing: 0.2px;
      white-space: nowrap;
    }
    .logo{
      width: 34px; height: 34px; border-radius: 10px;
      background: linear-gradient(145deg, rgba(138,225,255,0.22), rgba(178,255,218,0.18));
      border: 1px solid rgba(255,255,255,0.12);
      box-shadow: 0 10px 35px rgba(0,0,0,0.35);
      display:flex; align-items:center; justify-content:center;
      flex: 0 0 auto;
    }
    .logo svg{ opacity: 0.9; }
    .nav{
      display:flex; align-items:center; gap: 12px;
      color: var(--muted);
      font-size: 14px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .nav a{ padding: 8px 10px; border-radius: 10px; }
    .nav a:hover{ background: rgba(255,255,255,0.06); color: var(--text); }
    @media (max-width: 860px){
      .nav{ display:none; }
    }

    /* Page */
    main{ padding: 30px 0 52px; }
    .card{
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--panel);
      box-shadow: var(--shadow);
      padding: 22px;
    }
    h1{
      margin: 0 0 8px;
      font-size: 28px;
      letter-spacing: -0.25px;
    }
    .sub{
      margin: 0 0 18px;
      color: var(--muted);
      font-size: 14px;
    }

    h2{
      margin: 18px 0 10px;
      font-size: 16px;
      letter-spacing: 0.2px;
    }
    p{ margin: 0 0 12px; color: rgba(255,255,255,0.86); }
    ul{ margin: 0 0 12px; padding-left: 18px; color: rgba(255,255,255,0.86); }
    li{ margin: 6px 0; }

    .note{
      border: 1px solid rgba(255,255,255,0.10);
      background: rgba(0,0,0,0.18);
      border-radius: 16px;
      padding: 12px 12px;
      color: var(--muted);
      font-size: 13px;
      margin: 14px 0 6px;
    }

    footer{
      border-top: 1px solid var(--border);
      padding: 18px 0 34px;
      color: var(--faint);
      font-size: 13px;
      margin-top: 22px;
    }
    .footer-links{
      display:flex; gap: 12px; flex-wrap:wrap;
      color: var(--muted);
      margin-top: 10px;
    }
    .footer-links a{
      padding: 6px 8px;
      border-radius: 10px;
    }
    .footer-links a:hover{
      background: rgba(255,255,255,0.06);
      color: var(--text);
    }