:root {
  color-scheme: light;
  --content-background: #f4f6f8;
  --content-surface: #ffffff;
  --content-border: #d0d7de;
  --content-text: #1f2328;
  --content-muted: #57606a;
  --content-accent: #0969da;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--content-text);
  background: var(--content-background);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.8;
}

.content-page-main {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  padding: 44px 0 20px;
}

.content-page-back {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--content-accent);
  font-weight: 650;
  text-decoration: none;
}

.content-page-header { margin-bottom: 24px; }
.content-page-breadcrumb {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 8px;
  color: var(--content-muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.content-page-breadcrumb a { color: var(--content-accent); text-decoration: none; }
.content-page-header h1 { margin: 0; font-size: clamp(1.75rem, 4vw, 2.25rem); }
.content-page-header p { color: var(--content-muted); }
.content-page-card {
  padding: 28px;
  background: var(--content-surface);
  border: 1px solid var(--content-border);
  border-radius: 10px;
}

.content-page-card h2 {
  margin: 30px 0 8px;
  padding-top: 18px;
  border-top: 1px solid var(--content-border);
  font-size: 1.18rem;
}

.content-page-card h2:first-child { margin-top: 0; padding-top: 0; border-top: 0; }
.content-page-card p { margin: 8px 0; }
.content-page-card ul { margin: 8px 0; padding-left: 1.4rem; }
.content-page-card a { color: var(--content-accent); }
.content-page-muted { color: var(--content-muted); }
.content-page-link-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; }

@media (max-width: 640px) {
  .content-page-main { width: min(100% - 24px, 920px); padding-top: 26px; }
  .content-page-card { padding: 22px 18px; }
  .content-page-link-list { grid-template-columns: 1fr; }
}