:root {
  --bg: #ffffff;
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #111827;
  --accent-ink: #ffffff;
  --soft: #f3f4f6;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  line-height: 1.6;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

.nav { border-bottom: 1px solid var(--line); background: rgba(255,255,255,0.9); position: sticky; top: 0; z-index: 10; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-size: 20px; font-weight: 600; text-decoration: none; color: var(--ink); }
.nav nav { display: flex; gap: 20px; flex-wrap: wrap; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav nav a:hover { color: var(--ink); }

.hero { padding: 96px 0 72px; text-align: center; }
.hero.compact { padding: 56px 0 40px; }
.hero h1 { font-size: clamp(32px, 5vw, 56px); line-height: 1.15; margin: 16px auto 0; max-width: 16ch; }
.hero .eyebrow { color: var(--muted); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; }
.hero .sub { color: var(--muted); font-size: 17px; max-width: 620px; margin: 20px auto 0; }
.cta { display: flex; gap: 12px; justify-content: center; margin-top: 32px; flex-wrap: wrap; }
.btn { border: 1px solid var(--line); border-radius: 999px; padding: 12px 22px; text-decoration: none; color: var(--ink); font-weight: 500; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.features { padding: 24px 0 72px; }
.grid3, .grid4 { display: grid; gap: 16px; }
.grid3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.card { border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.tile { border: 1px solid var(--line); border-radius: 14px; padding: 20px; text-align: center; text-decoration: none; color: var(--ink); font-weight: 600; }
.tile small { color: var(--muted); font-weight: 400; }
.links-band { padding-bottom: 72px; }
.footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 13px; text-align: center; }

.doc { display: grid; grid-template-columns: 220px 1fr; gap: 40px; padding-top: 48px; padding-bottom: 80px; }
.doc-nav { position: sticky; top: 84px; align-self: start; display: flex; flex-direction: column; gap: 10px; }
.doc-nav h3 { margin: 0 0 6px; font-size: 14px; text-transform: uppercase; color: var(--muted); }
.doc-nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.doc-nav a:hover { color: var(--ink); }
.doc-body h1 { margin-top: 0; }
.doc-body h2 { margin-top: 40px; }
.doc-body pre { background: var(--soft); border-radius: 10px; padding: 14px; overflow: auto; font-size: 13px; }
@media (max-width: 720px) { .doc { grid-template-columns: 1fr; } .doc-nav { position: static; } }

.status-row { margin: 16px 0; }
.status-row .ok { color: #047857; }
.status-row .bad { color: #b91c1c; }
.tabs { display: flex; gap: 8px; border-bottom: 1px solid var(--line); margin: 16px 0; }
.tab { border: 0; background: none; padding: 10px 14px; cursor: pointer; color: var(--muted); border-bottom: 2px solid transparent; }
.tab.active { color: var(--ink); border-bottom-color: var(--ink); }
.hidden { display: none; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; }

/* Admin */
.auth { max-width: 420px; margin: 0 auto; text-align: left; }
.auth label { display: block; font-size: 14px; font-weight: 500; margin: 12px 0 6px; }
.auth input { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: 14px; }
.auth details { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 12px; }
.form-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.form-row input, .form-row select { border: 1px solid var(--line); border-radius: 10px; padding: 9px 10px; font-size: 13px; }
.btn.small { padding: 6px 10px; font-size: 12px; }
.big { font-size: 28px; font-weight: 700; margin: 4px 0 0; }
.who { color: var(--muted); font-size: 12px; }
.tab.danger { color: #b91c1c; }
.log { background: #0f172a; color: #e2e8f0; border-radius: 10px; padding: 14px; font-size: 12px; max-height: 360px; overflow: auto; white-space: pre-wrap; }
#doc-content { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 12px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
#doc-title, #doc-slug { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 10px; }
#doc-preview { border: 1px solid var(--line); border-radius: 10px; margin-top: 12px; padding: 12px; background: var(--soft); }
.ok { color: #047857; }
.bad { color: #b91c1c; }
details summary { cursor: pointer; font-weight: 500; }