:root{
      --bg:#0d1117;
      --card:#161b22;
      --accent:#5865F2;
      --text:#e6edf3;
      --muted:#8b98a5;
      --radius:14px;
      font-family: Inter, system-ui, Arial;
    }
    body{
      margin:0; background:var(--bg); color:var(--text);
      display:flex; align-items:center; justify-content:center;
      min-height:100vh; padding:24px;
    }
    .box{
      background:var(--card);
      padding:32px;
      border-radius:var(--radius);
      max-width:420px;
      width:100%;
      text-align:center;
      box-shadow:0 6px 20px rgba(0,0,0,0.3);
      border:1px solid rgba(255,255,255,0.05);
    }
    h1{margin:0 0 10px;font-size:26px}
    p{margin:0 0 20px;color:var(--muted)}

    .btn{
      display:inline-block;
      background:var(--accent);
      color:white;
      padding:12px 18px;
      border-radius:10px;
      font-weight:600;
      text-decoration:none;
      cursor:pointer;
      transition:0.15s;
    }
    .btn:hover{
      filter:brightness(1.15);
      transform:translateY(-2px);
    }

    footer{margin-top:20px;font-size:13px;color:var(--muted)}