:root {
  --ink-black: #011627;
  --porcelain: #fdfffc;
  --light-sea-green: #2ec4b6;
  --punch-red: #e71d36;
  --amber-glow: #ff9f1c;

  --bg: var(--ink-black);
  --fg: var(--porcelain);
  --muted: #93a4b3;
  --accent: var(--light-sea-green);
  --accent-warm: var(--amber-glow);
  --danger: var(--punch-red);
  --border: #163247;
  --card-bg: #052236;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: var(--porcelain);
    --fg: var(--ink-black);
    --muted: #5b6a76;
    --border: #dfe6e8;
    --card-bg: #f2f6f6;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
}

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

h1, h2, h3, h4 {
  line-height: 1.25;
}

.heading-permalink {
  display: none;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 1.5rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.site-header .brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
  margin-right: auto;
}

.brand-mark {
  width: 1.3rem;
  height: auto;
}

.site-header nav {
  display: flex;
  gap: 1.25rem;
}

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

.site-header nav a.active,
.site-header nav a:hover {
  color: var(--accent-warm);
}

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--fg);
}

@media (max-width: 640px) {
  .nav-toggle-label {
    display: block;
  }

  .site-header nav {
    display: none;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    padding-top: 0.75rem;
  }

  .nav-toggle:checked ~ nav {
    display: flex;
  }
}

main {
  max-width: 42rem;
  min-height: 70vh;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: underline;
}

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

.breadcrumb .current {
  color: var(--fg);
  font-weight: 600;
}

.breadcrumb .sep {
  opacity: 0.5;
}

.document-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.document-list .document {
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.document-list h2 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.document-list .download {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
  color: var(--accent-warm);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer .footer-links {
  display: flex;
  gap: 1rem;
}

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover {
  color: var(--accent-warm);
}