:root {
    --bg: #eef0f3; --surface: #fbfcfd; --surface-2: #e4e7ec;
    --line: #cfd5dd; --line-soft: #dfe4ea; --text: #191d24; --muted: #666f7e;
    --accent: #0f7a72; --accent-ink: #ffffff; --bad: #a4423a;
    --shadow: 0 1px 2px rgba(20, 26, 36, .07);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #10131a; --surface: #181d25; --surface-2: #202731;
      --line: #2c3540; --line-soft: #222a34; --text: #e3e8ef; --muted: #8b95a4;
      --accent: #3fc9bb; --accent-ink: #07130f; --bad: #e07065;
      --shadow: 0 1px 2px rgba(0, 0, 0, .4);
    }
  }
  :root[data-theme="dark"] {
    --bg: #10131a; --surface: #181d25; --surface-2: #202731;
    --line: #2c3540; --line-soft: #222a34; --text: #e3e8ef; --muted: #8b95a4;
    --accent: #3fc9bb; --accent-ink: #07130f; --bad: #e07065;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4);
  }

  * { box-sizing: border-box; }
  html, body { margin: 0; }
  body {
    background: var(--bg); color: var(--text);
    font-family: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
    font-size: 15px; line-height: 1.55; padding: 0 16px;
  }
  .wrap { max-width: 640px; margin: 0 auto; padding-block: 72px 56px; }

  h1 { font-size: 30px; font-weight: 600; margin: 0; letter-spacing: -.02em; }
  .sub { color: var(--muted); margin: 10px 0 0; }
  .sub b { color: var(--text); font-weight: 500; }

  form { display: flex; gap: 8px; margin: 28px 0 0; flex-wrap: wrap; }
  input[type=url], input[type=text] {
    flex: 1 1 280px; min-width: 0;
    font: inherit; font-family: "IBM Plex Mono", monospace; font-size: 14px;
    color: var(--text); background: var(--surface);
    border: 1px solid var(--line); border-radius: 5px; padding: 11px 12px;
    box-shadow: var(--shadow);
  }
  input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
  button {
    font: inherit; font-size: 14px; font-weight: 600;
    color: var(--accent-ink); background: var(--accent);
    border: 1px solid transparent; border-radius: 5px; padding: 11px 20px; cursor: pointer;
  }
  button:hover { filter: brightness(1.08); }
  button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

  .err {
    margin: 14px 0 0; padding: 10px 12px; font-size: 13.5px;
    color: var(--bad); border: 1px solid currentColor; border-radius: 5px;
  }

  .hosts {
    margin: 14px 0 0; font-family: "IBM Plex Mono", monospace;
    font-size: 12.5px; color: var(--muted);
  }

  .try { margin: 36px 0 0; }
  .try h2 {
    font-size: 11px; text-transform: uppercase; letter-spacing: .09em;
    color: var(--muted); font-weight: 600; margin: 0 0 10px;
  }
  .try ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 7px; }
  .try a {
    display: inline-block; font-family: "IBM Plex Mono", monospace; font-size: 12.5px;
    color: var(--text); text-decoration: none;
    background: var(--surface); border: 1px solid var(--line); border-radius: 999px;
    padding: 5px 12px; box-shadow: var(--shadow);
  }
  .try a:hover { border-color: var(--accent); color: var(--accent); }

  .how { margin: 40px 0 0; padding-top: 22px; border-top: 1px solid var(--line-soft); }
  .how h2 {
    font-size: 11px; text-transform: uppercase; letter-spacing: .09em;
    color: var(--muted); font-weight: 600; margin: 0 0 10px;
  }
  .how p { margin: 0 0 10px; font-size: 13.5px; color: var(--muted); }
  .how p b { color: var(--text); font-weight: 500; }
  code {
    font-family: "IBM Plex Mono", monospace; font-size: 12.5px;
    background: var(--surface-2); padding: 1px 5px; border-radius: 3px;
  }