:root {
  --bg: #f6f6f4; --card: #ffffff; --text: #1d1d1b; --muted: #5f5f5a; --line: #e2e2dd;
  --accent: #2f4a3f; --accent-text: #ffffff; --error: #9b2c2c; --ok: #2f6b3f; --code: #f0f0ec;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #151514; --card: #1f1f1d; --text: #ececea; --muted: #a4a49e; --line: #34342f;
    --accent: #8fb3a2; --accent-text: #10110f; --error: #f0a3a3; --ok: #9bd3a8; --code: #2a2a27; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body { font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 480px; margin: 0 auto; padding: 40px 16px 64px; }
.brand { font-weight: 650; letter-spacing: .02em; margin-bottom: 20px; font-size: 18px; }
.brand span { color: var(--muted); font-weight: 400; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
h1 { font-size: 22px; margin: 0 0 8px; line-height: 1.25; }
h2 { font-size: 17px; margin: 22px 0 8px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); font-size: 14px; }
label { display: block; font-size: 14px; font-weight: 600; margin: 14px 0 6px; }
input, select { width: 100%; padding: 10px 12px; font: inherit; border: 1px solid var(--line); border-radius: 8px;
  background: var(--card); color: var(--text); }
button, .button { display: inline-block; padding: 10px 16px; font: inherit; font-weight: 600; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-text); cursor: pointer; text-decoration: none; }
button.secondary { background: transparent; color: var(--text); border-color: var(--line); }
button:disabled { opacity: .6; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.linkish { background: none; border: 0; padding: 0; color: var(--muted); text-decoration: underline; font-weight: 400; font-size: 14px; cursor: pointer; }
.error { color: var(--error); font-size: 14px; margin-top: 12px; }
.ok { color: var(--ok); }
.copy { display: flex; gap: 8px; align-items: stretch; margin: 8px 0 4px; }
.copy code { flex: 1; min-width: 0; overflow-wrap: anywhere; background: var(--code); border-radius: 8px; padding: 10px 12px; font-size: 14px; }
ol { padding-left: 20px; margin: 0 0 12px; }
li { margin-bottom: 6px; }
.tabs { display: flex; gap: 6px; margin-bottom: 8px; }
.tabs button { flex: 1; background: transparent; color: var(--muted); border-color: var(--line); }
.tabs button[aria-selected="true"] { background: var(--code); color: var(--text); }
[hidden] { display: none !important; }