:root {
      color-scheme: light;
      --bg: #f5f5f2;
      --panel: #ffffff;
      --line: #d4d4cf;
      --text: #171717;
      --muted: #666660;
      --accent: #007aff;
      --err: #ef4444;
      --ok: #168044;
    }
    * { box-sizing: border-box; }
    body {
      min-height: 100vh;
      margin: 0;
      display: grid;
      place-items: center;
      background: var(--bg);
      color: var(--text);
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      padding: 18px;
    }
    main {
      width: min(100%, 430px);
      background: var(--panel);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 22px;
    }
    h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: 0; }
    p { margin: 0 0 18px; color: var(--muted); }
    form { display: grid; gap: 14px; }
    label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; font-weight: 700; }
    input {
      width: 100%;
      border: 1px solid var(--line);
      border-radius: 6px;
      background: #ffffff;
      color: var(--text);
      font: inherit;
      padding: 12px;
    }
    button {
      border: 0;
      border-radius: 6px;
      background: var(--accent);
      color: #ffffff;
      cursor: pointer;
      font: inherit;
      font-weight: 800;
      padding: 12px 14px;
    }
    a { color: var(--accent); text-decoration: none; }
    ul { margin: 8px 0 0; padding-left: 20px; }
    .criteria, .error {
      border: 1px solid var(--line);
      border-radius: 6px;
      padding: 12px;
      font-size: 14px;
    }
    .criteria { color: var(--muted); }
    .criteria strong { color: var(--text); }
    .error { border-color: rgba(239, 68, 68, .45); color: #991b1b; background: rgba(239, 68, 68, .10); }
    .muted { margin-top: 16px; color: var(--muted); }