:root { color-scheme: light; }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
      background: #0b0b0c;
      color: #fff;
    }
    .wrap {
      max-width: 520px;
      margin: 0 auto;
      padding: 18px 16px 24px;
    }
    .card {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.10);
      border-radius: 16px;
      padding: 14px;
      margin-top: 12px;
    }
    h1 { margin: 10px 0 6px; font-size: 22px; letter-spacing: .2px; }
    .sub { margin: 0; opacity: .8; line-height: 1.4; font-size: 14px; }
    .big {
      width: 100%;
      border: none;
      border-radius: 16px;
      padding: 18px 16px;
      font-size: 20px;
      font-weight: 700;
      background: #ff2d2d;
      color: #fff;
      margin-top: 14px;
      cursor: pointer;
      touch-action: manipulation;
    }
    .row { display: flex; gap: 10px; margin-top: 10px; }
    .btn {
      flex: 1;
      border: 1px solid rgba(255,255,255,0.16);
      background: rgba(255,255,255,0.08);
      color: #fff;
      border-radius: 14px;
      padding: 12px 12px;
      font-size: 15px;
      cursor: pointer;
      touch-action: manipulation;
    }
    .btn:active, .big:active { transform: translateY(1px); }
    .muted { opacity: .75; font-size: 13px; line-height: 1.45; }
    .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; word-break: break-all; }
    a { color: #9ad0ff; text-decoration: none; }
    .status {
      padding: 10px 12px;
      border-radius: 12px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.10);
      font-size: 14px;
      line-height: 1.45;
      white-space: pre-line;
    }
    .hint {
      font-size: 14px;
      line-height: 1.5;
      padding: 12px;
      border-radius: 14px;
      background: rgba(255,255,0,0.10);
      border: 1px solid rgba(255,255,0,0.16);
    }
    .footer { margin-top: 12px; opacity: .65; font-size: 12px; line-height: 1.5; }