:root {
  --bg: #fafaf7;
  --surface: #ffffff;
  --ink: #0f1a14;
  --ink-muted: #5a6b62;
  --line: #e6e4dc;
  --accent: #2D6A4F;
  --accent-soft: #e8f1ec;
  --warn: #b25b00;
  --radius: 14px;
  --maxw: 720px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
a:hover { border-bottom-color: var(--accent); }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}
header.site .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
header.site .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  border: none;
  font-size: 18px;
}
header.site .brand .mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: block;
  object-fit: cover;
}
header.site nav {
  display: flex;
  align-items: center;
  gap: 18px;
}
header.site nav a {
  font-size: 15px;
  color: var(--ink-muted);
  border: none;
}
header.site nav a:hover,
header.site nav a[aria-current="page"] {
  color: var(--ink);
}
header.site .lang-switch {
  margin: 0 0 0 4px;
  padding: 2px;
  border-radius: 999px;
}
header.site .lang-switch a {
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: 0.04em;
  font-weight: 600;
}
@media (max-width: 560px) {
  header.site .wrap { gap: 10px; padding: 12px 14px; flex-wrap: wrap; }
  header.site nav { gap: 12px; font-size: 14px; }
  header.site .brand span { font-size: 16px; }
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 48px 20px 96px;
}

h1 {
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}
h3 {
  font-size: 18px;
  margin: 28px 0 8px;
}
p, ul, ol, table { margin: 0 0 16px; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 36px 0;
}

.lede {
  color: var(--ink-muted);
  font-size: 18px;
  margin-bottom: 24px;
}

.meta {
  color: var(--ink-muted);
  font-size: 14px;
  margin: 0 0 24px;
}

.callout {
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 24px 0;
  color: var(--ink);
}

.placeholder {
  background: #fff3df;
  border: 1px dashed var(--warn);
  color: var(--warn);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  background: #f1efe8;
  font-weight: 600;
}

code {
  background: #f1efe8;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 14.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.lang-switch {
  display: inline-flex;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
  margin: 0 0 24px;
}
.lang-switch a {
  border: none;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-muted);
  font-weight: 500;
}
.lang-switch a[aria-current="page"] {
  background: var(--accent);
  color: #fff;
}

.hero {
  text-align: center;
  padding: 24px 0 48px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
}
.hero .icon-large {
  width: 112px;
  height: 112px;
  border-radius: 24px;
  margin: 0 auto 20px;
  display: block;
  object-fit: cover;
  box-shadow: 0 12px 28px -10px color-mix(in srgb, var(--accent) 45%, transparent);
}
.hero h1 { font-size: 44px; margin-bottom: 12px; }
.hero p { max-width: 520px; margin: 0 auto 24px; color: var(--ink-muted); }

.cards {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  margin: 24px 0;
}
@media (min-width: 560px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
.card {
  display: block;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  transition: border-color 120ms ease, transform 120ms ease;
}
.card:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
  transform: translateY(-1px);
}
.card .card-title {
  font-weight: 600;
  margin-bottom: 4px;
}
.card .card-desc {
  color: var(--ink-muted);
  font-size: 14.5px;
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 24px 20px;
  text-align: center;
  color: var(--ink-muted);
  font-size: 13px;
}

@media (max-width: 480px) {
  main { padding: 32px 18px 64px; }
  h1 { font-size: 28px; }
  .hero h1 { font-size: 34px; }
  .hero .icon-large { width: 96px; height: 96px; border-radius: 20px; }
}