:root {
  --page-max: 1460px;
  --page-pad-x: 20px;
  --header-pad-y: 12px;
  --bg: #f7f4ef;
  --surface: #ffffff;
  --ink: #1c1c1c;
  --muted: #5c564e;
  --line: #ddd6cb;
  --accent: #0b4f4a;
  --accent-soft: #eef6f5;
  --warn: #8a5a12;
  --warn-bg: #fff6e8;
  --ok: #0b4f4a;
  --ok-bg: #e8f6f1;
  --danger: #9a3412;
  --danger-bg: #fef2f0;
  --shadow: 0 10px 30px rgba(28, 28, 28, 0.06);
  --radius: 14px;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 8% -10%, #e4ebe8 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #f0e8dc 0%, transparent 45%),
    var(--bg);
  font-family: var(--sans);
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(247, 244, 239, 0.9);
  border-bottom: 1px solid var(--line);
}
.site-header-inner {
  max-width: var(--page-max);
  width: 100%;
  margin: 0 auto;
  padding: var(--header-pad-y) var(--page-pad-x);
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.brand strong { font-size: 1.05rem; letter-spacing: -0.01em; }
.brand span { color: var(--muted); font-size: 0.85rem; }
.nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}
.nav a { text-decoration: none; }
.nav-dd { position: relative; }
.nav-dd-main {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--ink);
  font-size: 0.92rem;
  white-space: nowrap;
}
.nav-dd-main::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.55;
}
.nav-dd-main:hover,
.nav-dd:focus-within > .nav-dd-main,
.nav-dd.open > .nav-dd-main {
  background: var(--accent-soft);
  text-decoration: none;
}
.nav-dd-main.active,
.nav-dd:has(.nav-dd-menu a.active) > .nav-dd-main {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.nav-dd-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 220px;
  padding: 6px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  z-index: 40;
}
.nav-dd:hover > .nav-dd-menu,
.nav-dd:focus-within > .nav-dd-menu,
.nav-dd.open > .nav-dd-menu {
  display: block;
}
.nav-dd-menu a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--ink);
  font-size: 0.88rem;
  white-space: nowrap;
}
.nav-dd-menu a:hover {
  background: var(--accent-soft);
  text-decoration: none;
}
.nav-dd-menu a.active {
  background: var(--accent);
  color: #fff;
}

main {
  max-width: var(--page-max);
  width: 100%;
  margin: 0 auto;
  padding: 28px var(--page-pad-x) 64px;
}

.hero { margin-bottom: 28px; }
.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 62rem;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 0.82rem;
  color: var(--muted);
}
.chip.ok { background: var(--ok-bg); color: var(--ok); border-color: #b9dfc8; }
.chip.warn { background: var(--warn-bg); color: var(--warn); border-color: #efd6a8; }
.chip.danger { background: var(--danger-bg); color: var(--danger); border-color: #f0c9bc; }

.toc {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 24px 0 32px;
}
.toc a {
  display: block;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  color: var(--ink);
}
.toc a:hover { border-color: #9bb8b4; text-decoration: none; }
.toc strong { display: block; margin-bottom: 4px; }
.toc span { color: var(--muted); font-size: 0.88rem; }

.section { margin: 36px 0; }
.section > h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}
.section > p.lead {
  margin: 0 0 16px;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 18px;
}
.card-head {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  flex-wrap: wrap;
  background: linear-gradient(180deg, #fbfaf8, #f3f0ea);
}
.card-head h3 { margin: 0; font-size: 1.05rem; }
.card-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.card-body {
  padding: 8px 10px 16px;
  overflow-x: auto;
}
.mermaid {
  display: flex;
  justify-content: center;
  min-width: min(100%, 720px);
}

.note {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid #c5ddd9;
  color: #1a3d39;
  font-size: 0.9rem;
}
.note.warn {
  background: var(--warn-bg);
  border-color: #efd6a8;
  color: #5c3d0d;
}
.note.danger {
  background: var(--danger-bg);
  border-color: #f0c9bc;
  color: #7c2d12;
}

.legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin: 16px 0 8px;
}
.legend-item {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 0.88rem;
}
.legend-item strong { display: block; margin-bottom: 4px; }
.legend-item span { color: var(--muted); }

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 8px 0 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
table.attr {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-top: 8px;
}
.table-wrap > table.attr { margin: 0; }
table.attr th,
table.attr td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.attr th {
  color: var(--muted);
  font-weight: 600;
  background: #f3f0ea;
}
table.attr tbody tr:last-child td { border-bottom: 0; }
table.attr tbody tr:hover td { background: #faf9f7; }
table.attr code {
  font-family: var(--mono);
  font-size: 0.84em;
  background: #f0ebe3;
  padding: 1px 5px;
  border-radius: 4px;
}
.yes { color: var(--ok); font-weight: 600; }
.no { color: var(--danger); font-weight: 600; }

.footer {
  max-width: var(--page-max);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--page-pad-x) 40px;
  color: var(--muted);
  font-size: 0.86rem;
}

@media (max-width: 640px) {
  .card-body { padding: 4px 2px 10px; }
}