:root {
  --color-text: #1a1a1a;
  --color-text-secondary: #666;
  --color-text-muted: #707070;
  --color-bg: #fff;
  --color-bg-subtle: #f8f8f8;
  --color-border: #e5e5e5;
  --color-accent: #1979a7;
  --color-accent-hover: #136185;
  --color-accent-subtle: #edf6fa;
  --font-stack: system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--font-stack);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* Site header */
.site-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
}

.site-title {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.site-title:hover { color: var(--color-accent-hover); }
.header-sep { color: var(--color-text-muted); }
.header-current { color: var(--color-text-secondary); }

/* Page heading */
h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.intro {
  color: var(--color-text-secondary);
  font-size: 15px;
  margin: 0 0 2rem;
}

.intro code {
  font-size: 13px;
  background: var(--color-bg-subtle);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--color-text);
}

/* Tier groupings */
.tier { margin-top: 2.5em; }
.tier:first-of-type { margin-top: 1.5em; }

.tier-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.3em;
  margin: 0 0 1em;
}

/* Source sections */
.source-section {
  margin: 2em 0;
  scroll-margin-top: 1em;
}

.source-section h2 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 0.3em;
}

.source-meta {
  color: var(--color-text-muted);
  font-size: 13px;
  margin: 0 0 0.8em;
}

.source-meta > * { margin-right: 0.25em; }

.source-meta a {
  color: var(--color-accent);
  text-decoration: none;
}

.source-meta a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.source-description { margin: 1em 0; }

.anchor-link {
  opacity: 0;
  margin-left: 0.35em;
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 400;
  font-size: 0.85em;
}

.source-section h2:hover .anchor-link,
.source-section:target .anchor-link {
  opacity: 1;
}

.source-section h3 {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin: 1.5em 0 0.4em;
}

.source-files, .source-used-by, .source-caveats {
  padding-left: 1.2em;
  margin: 0;
}

.source-files a, .source-used-by a {
  color: var(--color-accent);
  text-decoration: none;
}

.source-files a:hover, .source-used-by a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.source-file-format {
  font-size: 12px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--color-text-muted);
  margin-left: 0.25em;
}

.source-citation {
  font-style: italic;
  color: var(--color-text-secondary);
}

/* Jump list */
.source-jumps {
  margin: 1.5em 0;
  font-size: 13px;
  line-height: 1.8;
}

.jump-label {
  color: var(--color-text-muted);
  margin-right: 0.5em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 11px;
}

.source-jumps a {
  display: inline-block;
  padding: 2px 10px;
  margin: 0 4px 4px 0;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: var(--color-accent-hover);
  text-decoration: none;
}

.source-jumps a:hover {
  background: var(--color-accent-subtle);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Cite-this-site footer */
.cite-site {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.cite-site h2 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  margin: 0 0 0.6em;
}

.cite-site p {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}

.cite-site code {
  font-size: 12px;
  background: var(--color-bg-subtle);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--color-text);
}

/* Site footer */
.site-footer {
  margin-top: 3rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-muted);
}

.site-footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-sep {
  margin: 0 0.4em;
  color: var(--color-border);
}