:root {
  color-scheme: light;
  --bg: #f7f5f0;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #65717d;
  --line: #d8dee4;
  --brand: #116466;
  --brand-dark: #0b4c4d;
  --accent: #c4552d;
  --max: 1120px;
  --content: 760px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 17px;
}

a {
  color: var(--brand-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
  font-size: 1.05rem;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  min-width: 42px;
  min-height: 38px;
  border-radius: 6px;
  font-size: 1.25rem;
  line-height: 1;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--brand-dark);
}

.page-shell {
  max-width: var(--max);
  margin: 0 auto;
  padding: 44px 24px 64px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--content)) minmax(220px, 1fr);
  gap: 56px;
  align-items: start;
}

.article-layout.no-toc {
  grid-template-columns: minmax(0, var(--content));
}

.article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 44px;
}

.breadcrumb {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 18px;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

h1,
h2,
h3,
h4 {
  color: #18222d;
  line-height: 1.2;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: 0;
  margin-bottom: 20px;
}

h2 {
  font-size: 1.55rem;
  margin-top: 36px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 28px;
}

p,
ul,
ol,
table,
blockquote,
pre {
  margin-top: 0;
  margin-bottom: 18px;
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 6px;
}

strong {
  font-weight: 750;
}

blockquote {
  border-left: 4px solid var(--brand);
  padding-left: 18px;
  color: #384552;
  margin-left: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.96rem;
  overflow: hidden;
}

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

th {
  background: #eef4f4;
  font-weight: 700;
}

code {
  background: #eef0f2;
  border-radius: 4px;
  padding: 0.1em 0.3em;
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  background: #17212b;
  color: #f4f7fa;
  border-radius: 8px;
  padding: 18px;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.article-meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 26px;
}

.toc {
  position: sticky;
  top: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  font-size: 0.94rem;
}

.toc-title {
  font-weight: 750;
  margin-bottom: 10px;
}

.toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 0;
}

.toc a:hover {
  color: var(--brand-dark);
}

.related {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding-top: 26px;
}

.related h2 {
  margin-top: 0;
}

.related-list {
  display: grid;
  gap: 10px;
  padding-left: 0;
  list-style: none;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

@media (max-width: 860px) {
  .header-inner {
    align-items: flex-start;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    display: none;
    width: 100%;
    padding-top: 14px;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav.is-open {
    display: flex;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .article-layout {
    display: block;
  }

  .article {
    padding: 30px 22px;
  }

  .toc {
    position: static;
    margin-top: 24px;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 16px;
  }

  .page-shell {
    padding: 28px 14px 46px;
  }

  .article {
    border-radius: 6px;
  }
}