:root {
  --bg: #f7f9fb; --card: #fff; --ink: #183850; --muted: #5b7083; --line: #dde5ec;
  --accent: #0b6f51; --warn: #9a5b00; --bad: #a32020; --chip: #eef3f7;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1a22; --card: #17252f; --ink: #e8eff4; --muted: #9db0bf; --line: #2a3b47; --accent: #4fd0a5; --warn: #f0b860; --bad: #ff8a8a; --chip: #213340; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.45 system-ui, -apple-system, sans-serif; background: var(--bg); color: var(--ink); }
[hidden] { display: none !important; }
header { position: sticky; top: 0; z-index: 2; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top)); background: var(--card); border-bottom: 1px solid var(--line); }
nav { display: flex; gap: 4px; flex: 1; }
nav a { padding: 6px 10px; border-radius: 8px; color: var(--ink); text-decoration: none; white-space: nowrap; }
@media (max-width: 640px) {
  header strong { flex: 1; }
  nav { order: 3; flex-basis: 100%; overflow-x: auto; }
}
nav a.on { background: var(--chip); font-weight: 600; }
main { max-width: 860px; margin: 0 auto; padding: 16px; padding-bottom: max(32px, env(safe-area-inset-bottom)); }
h1 { font-size: 22px; margin: 8px 0 12px; }
h2 { font-size: 16px; margin: 20px 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; margin: 0 0 10px; }
.card.link { display: block; color: inherit; text-decoration: none; }
.card.link:hover { border-color: var(--accent); }
.narrow { max-width: 420px; margin: 8vh auto 0; }
.row { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; }
.title { font-weight: 600; overflow-wrap: anywhere; }
.muted { color: var(--muted); font-size: 14px; overflow-wrap: anywhere; }
.quote { white-space: pre-wrap; overflow-wrap: anywhere; margin: 6px 0 0; padding-left: 10px; border-left: 3px solid var(--line); }
.chip { display: inline-block; padding: 1px 8px; border-radius: 999px; background: var(--chip); font-size: 13px; }
.chip.warn { color: var(--warn); }
.chip.bad { color: var(--bad); }
.chip.ok { color: var(--accent); }
.error { color: var(--bad); margin: 8px 0; }
.note { color: var(--warn); font-size: 14px; margin: 8px 0; }
label { display: block; margin: 10px 0 4px; font-size: 14px; color: var(--muted); }
input, select, textarea { width: 100%; padding: 10px 12px; font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
textarea { min-height: 84px; }
button { margin-top: 12px; padding: 10px 16px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 10px; cursor: pointer; }
button.quiet { margin: 0; padding: 6px 10px; color: var(--ink); background: var(--chip); font-weight: 400; }
button.danger { background: var(--bad); }
button:disabled { opacity: .5; }
code { font: 13px ui-monospace, monospace; overflow-wrap: anywhere; }
.msg { margin: 0 0 8px; }
.msg.helper { margin-left: 12%; }
.msg.customer { margin-right: 12%; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 0; }
dt { color: var(--muted); font-size: 14px; }
dd { margin: 0; overflow-wrap: anywhere; }