/* Accent colour is the purple from the NOI logo. */
:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #6b7280;
  --border: #e5e7eb;
  --link: #4a4d96;
  --code-bg: #f6f8fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65;
}

header, main, footer { max-width: 820px; margin: 0 auto; padding: 0 1.25rem; }

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

/* header */
header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
header .brand { display: flex; align-items: center; gap: 0.6rem; color: var(--fg); text-decoration: none; font-weight: 600; }
header .brand img { height: 28px; }
header nav { margin-left: auto; display: flex; gap: 1rem; font-size: 0.9rem; }
header nav a { color: var(--muted); text-decoration: none; }
header nav a:hover { color: var(--fg); }

/* headings */
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 0.5rem; }
h2 { font-size: 1.35rem; margin: 2.5rem 0 0.75rem; padding-bottom: 0.3rem; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin: 1.75rem 0 0.5rem; color: var(--muted); }
.statement h2 { font-size: 1.1rem; border: 0; margin: 2rem 0 0.5rem; }
.statement h3 { font-size: 0.95rem; color: var(--fg); }

/* meta lines */
.crumb, .meta, .links { color: var(--muted); font-size: 0.87rem; }
.crumb { margin: 0 0 1rem; }
.meta { margin: 0 0 2rem; }
.links { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border); }

/* home page stats */
.stats { color: var(--muted); font-size: 0.95rem; margin: 0 0 0.5rem; }
.stats strong { color: var(--fg); }

/* index listing */
main ul { padding-left: 1.2rem; }
main li { margin-bottom: 0.25rem; }

/* content */
img { max-width: 100%; height: auto; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
}
pre code { background: none; border: 0; padding: 0; }
blockquote {
  margin: 0 0 1.25rem;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--border); padding: 0.4rem 0.6rem; text-align: left; }
th { background: var(--code-bg); }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

/* MathJax shouldn't push the page sideways */
.MathJax_Display { overflow-x: auto; overflow-y: hidden; }

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}