:root {
  --ink: #1b2430;
  --ink-soft: #4a5568;
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --border: #e2e5ea;
  --accent: #2f6f5e;
  --accent-soft: #eaf3f0;
  --max-width: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 24px;
}

header.site-header .wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand span {
  color: var(--accent);
}

nav.top-links {
  display: flex;
  gap: 20px;
  font-size: 0.92rem;
}

nav.top-links a {
  color: var(--ink-soft);
  text-decoration: none;
}

nav.top-links a:hover {
  color: var(--accent);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

h1 {
  font-size: 1.9rem;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.updated {
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin-bottom: 36px;
}

h2 {
  font-size: 1.25rem;
  margin-top: 2.4em;
  margin-bottom: 0.6em;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.02rem;
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

p, li {
  color: var(--ink);
  font-size: 0.98rem;
}

ul, ol {
  padding-left: 1.3em;
}

li {
  margin-bottom: 0.4em;
}

a {
  color: var(--accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0 1.6em;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.callout {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 1.4em 0;
  font-size: 0.92rem;
}

.callout.accent {
  background: var(--accent-soft);
  border-color: #cfe4dc;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

.btn:hover {
  opacity: 0.92;
}

.btn-secondary {
  display: inline-block;
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
  text-decoration: none;
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

hr.sep {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px 40px;
  margin-top: 40px;
}

footer.site-footer .wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

footer.site-footer a {
  color: var(--ink-soft);
}

footer.site-footer nav {
  display: flex;
  gap: 16px;
}

code {
  background: var(--bg-soft);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}

@media (max-width: 600px) {
  nav.top-links { gap: 12px; font-size: 0.85rem; }
  h1 { font-size: 1.55rem; }
  main { padding: 32px 18px 60px; }
}