*, *::before, *::after { box-sizing: border-box; }
:root {
  --bg: #f8fbf9;
  --paper: #ffffff;
  --ink: #18211d;
  --muted: #5d6b63;
  --line: #d7e2dc;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #b45309;
  --soft: #e9f4ef;
  --max: 820px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101512;
    --paper: #171f1b;
    --ink: #edf7f1;
    --muted: #afbeb6;
    --line: #2b3932;
    --brand: #5eead4;
    --brand-dark: #99f6e4;
    --accent: #fbbf24;
    --soft: #1e2a25;
  }
}
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.68;
}
a { color: var(--brand-dark); text-decoration-thickness: 0.08em; text-underline-offset: 0.18em; }
.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  position: sticky;
  top: 0;
  z-index: 2;
  backdrop-filter: blur(10px);
}
.site-nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}
.site-nav a:first-child { font-weight: 800; color: var(--ink); margin-right: auto; }
.site-nav a { text-decoration: none; font-size: 0.96rem; }
.page-shell { max-width: var(--max); margin: 0 auto; padding: 28px 18px 54px; }
.guide-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 16px;
  margin: 0 0 28px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.guide-banner strong, .guide-banner span { display: block; }
.guide-banner span { color: var(--muted); font-size: 0.94rem; }
.guide-banner a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 92px;
  padding: 9px 12px;
  border-radius: 8px;
  background: var(--brand);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
}
.article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(22px, 4vw, 44px);
}
.breadcrumbs { color: var(--muted); font-size: 0.9rem; margin-bottom: 18px; }
.breadcrumbs span { padding: 0 5px; }
h1 {
  margin: 0 0 12px;
  font-size: clamp(2.1rem, 7vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: 0;
}
.dek { color: var(--muted); font-size: 1.12rem; margin: 0 0 24px; }
.intro { font-size: 1.04rem; }
h2 {
  margin: 34px 0 10px;
  font-size: 1.38rem;
  line-height: 1.2;
  letter-spacing: 0;
}
p { margin: 0 0 14px; }
.ad-wrap {
  min-height: 0;
  margin: 24px 0;
  color: var(--muted);
  font-size: 0.86rem;
}
.related ul { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px 16px; padding-left: 20px; }
.hero-art { margin: 30px 0 12px; }
.hero-art img { display: block; width: 100%; height: auto; border-radius: 8px; border: 1px solid var(--line); }
.link-grid { margin-top: 28px; }
.link-grid > div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 9px;
}
.link-grid.compact > div { grid-template-columns: repeat(auto-fit, minmax(74px, 1fr)); }
.link-grid a {
  display: block;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  background: color-mix(in srgb, var(--paper) 80%, var(--soft));
}
table { width: 100%; border-collapse: collapse; margin: 14px 0; }
th, td { border: 1px solid var(--line); padding: 10px; text-align: left; vertical-align: top; }
th { background: var(--soft); }
.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
  padding: 26px 18px 40px;
}
@media (max-width: 640px) {
  .site-nav { gap: 12px; }
  .site-nav a:first-child { flex-basis: 100%; }
  .guide-banner { align-items: flex-start; flex-direction: column; }
  .guide-banner a { width: 100%; }
  .article { padding: 20px; }
}