:root {
      --bg: #050816;
      --card: #0f172a;
      --text: #e2e8f0;
      --muted: #94a3b8;
      --accent: #38bdf8;
      --button: #5865F2;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      min-height: 100vh;
      font-family: Inter, sans-serif;
      background: radial-gradient(circle at top, #0b1120 0%, #03050d 40%);
      color: var(--text);
      display: grid;
      place-items: center;
      padding: 20px;
    }
    .card {
      width: min(540px, 100%);
      background: var(--card);
      border: 1px solid rgba(148,163,184,.18);
      border-radius: 22px;
      padding: 34px;
      text-align: center;
    }
    h1 { margin-bottom: 12px; font-size: clamp(2rem, 3vw, 2.4rem); }
    p { margin: 0 0 18px; color: var(--muted); line-height: 1.6; }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 14px 20px;
      border-radius: 999px;
      border: none;
      font-weight: 700;
      color: white;
      background: var(--button);
      text-decoration: none;
      transition: transform .15s ease, background .15s ease;
    }
    .button:hover { transform: translateY(-1px); background: #4759d9; }
    .link { display: block; margin-top: 18px; color: var(--muted); text-decoration:none; }