:root {
  --bg: #f6f7f9; --fg: #1b1f24; --muted: #5c6670; --card: #fff; --line: #d9dee4;
  --ok: #1a7f37; --ok-bg: #e6f4ea; --bad: #b42318; --bad-bg: #fdecea; --warn: #9a6700; --warn-bg: #fff8e1;
  --accent: #0b5fff;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1216; --fg: #e6e9ee; --muted: #9aa4af; --card: #171b21; --line: #2a313a;
    --ok-bg: #11301b; --bad-bg: #3a1512; --warn-bg: #332a0c; --accent: #6ea0ff; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--fg); }
header, main, footer { max-width: 860px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 32px; }
h1 { margin: 0 0 4px; font-size: 1.8rem; }
.sub { margin: 0 0 24px; color: var(--muted); }
main { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; padding-bottom: 32px; }
@media (max-width: 720px) { main { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.card.api { grid-column: 1 / -1; }
h2 { margin: 0 0 12px; font-size: 1.1rem; }
label { display: block; margin-bottom: 12px; font-size: 0.9rem; color: var(--muted); }
label.check { display: flex; gap: 8px; align-items: center; }
.hint { font-weight: normal; }
input:not([type=checkbox]) { display: block; width: 100%; margin-top: 4px; padding: 10px 12px; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg); }
button { padding: 10px 16px; font-size: 1rem; border: 0; border-radius: 8px; background: var(--accent); color: #fff; cursor: pointer; }
button:disabled { opacity: 0.6; cursor: wait; }
.result { margin-top: 16px; border-radius: 8px; padding: 12px 14px; border: 1px solid var(--line); }
.result.ok { background: var(--ok-bg); border-color: var(--ok); }
.result.bad { background: var(--bad-bg); border-color: var(--bad); }
.result.warn { background: var(--warn-bg); border-color: var(--warn); }
.verdict { font-weight: 600; margin: 0 0 8px; }
.result dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; margin: 0; font-size: 0.9rem; }
.result dt { color: var(--muted); }
.result dd { margin: 0; word-break: break-all; }
pre { overflow-x: auto; background: var(--bg); padding: 12px; border-radius: 8px; font-size: 0.85rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
footer { color: var(--muted); font-size: 0.8rem; padding-bottom: 24px; }
nav.top { max-width: 860px; margin: 0 auto; padding: 16px 16px 0; display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
nav.top .brand { font-weight: 600; color: var(--fg); text-decoration: none; }
nav.top .spacer { flex: 1; }
a { color: var(--accent); }
form.inline { display: inline; margin: 0; }
button.link { background: none; color: var(--accent); padding: 0; font-size: inherit; text-decoration: underline; }
main.narrow { grid-template-columns: 1fr; max-width: 520px; padding-top: 32px; }
main.narrow h1 { font-size: 1.4rem; margin-bottom: 16px; }
a.button { display: inline-block; padding: 10px 16px; border-radius: 8px; background: var(--accent); color: #fff; text-decoration: none; }
form.row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin: 16px 0; }
form.row label { flex: 1; margin: 0; min-width: 180px; }
table.keys { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
table.keys th, table.keys td { text-align: left; padding: 8px 4px; border-bottom: 1px solid var(--line); }