:root {
  --bg: #fdfcf9;
  --fg: #1c1a17;
  --muted: #6b6459;
  --accent: #7a3b2e;
  --card-bg: #ffffff;
  --border: #e6e1d8;
  --radius: 10px;
  --max-width: 960px;
  font-family: -apple-system, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17150f;
    --fg: #ece7dd;
    --muted: #a49a8a;
    --accent: #d9997f;
    --card-bg: #221f18;
    --border: #332f26;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
  text-decoration: none;
}

.site-header nav a {
  margin-left: 1.25rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem 4rem;
}

.hero {
  padding: 2rem 0 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.hero h1 { font-size: 2.25rem; margin: 0 0 0.5rem; }
.hero p { color: var(--muted); margin: 0; }

section { margin-bottom: 3rem; }
section h2 { font-size: 1.4rem; margin-bottom: 1rem; }
.collection { margin-bottom: 2rem; }
.collection h3 { font-size: 1.1rem; color: var(--muted); margin-bottom: 0.75rem; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

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

.card h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.card h3 a { color: var(--fg); text-decoration: none; }
.card h3 a:hover { color: var(--accent); }
.card p { margin: 0 0 0.75rem; color: var(--muted); font-size: 0.92rem; }

.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0 0 0.75rem;
}

.tags li {
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
}

.card-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  color: var(--fg);
  text-decoration: none;
}

.btn:hover { border-color: var(--accent); color: var(--accent); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover { opacity: 0.9; color: #fff; }

.document-page h1 { margin-bottom: 0.25rem; }
.doc-description { color: var(--muted); margin-top: 0; }
.downloads { display: flex; gap: 0.5rem; margin: 1.25rem 0; flex-wrap: wrap; }

.pdf-viewer {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  height: 80vh;
}

.pdf-viewer embed { width: 100%; height: 100%; border: none; }

.variant { margin-bottom: 2.5rem; }
.variant-label { font-size: 1.05rem; color: var(--muted); margin-bottom: 0.5rem; }
.variant .pdf-viewer { height: 70vh; }

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}