/* ===== THEME: dark graphite + sandstone, amber as interactive accent only ===== */
:root {
  --bg: #242526;
  --bg-elevated: #242526;
  --bg-card: #383A3B;
  --border: #686A69;
  --border-subtle: rgba(104, 106, 105, 0.4);

  --text-primary: #E5D8C2;
  --text-secondary: #C4AC85;
  --text-muted: #917757;

  --sandstone: #C4AC85;
  --sandstone-light: #E5D8C2;
  --sandstone-dark: #917757;

  --amber: #91450D;
  --amber-hover: #C96819;
  --amber-glow: rgba(145, 69, 13, 0.35);

  --radius: 8px;
  --radius-sm: 6px;
  --transition: 240ms ease;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sidebar-width: 260px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
}

a {
  color: var(--sandstone);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--amber-hover); }

/* header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  font-weight: 600;
  font-size: 18px;
  color: var(--sandstone-light);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; color: var(--sandstone); }
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.nav-toggle:hover { border-color: var(--amber); color: var(--sandstone-light); }

/* layout */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  max-width: 1200px;
  margin: 0 auto;
}

.site-nav {
  border-right: 1px solid var(--border-subtle);
  padding: 24px 12px;
  height: calc(100vh - 57px);
  overflow-y: auto;
  position: sticky;
  top: 57px;
}
.nav-group { margin-bottom: 20px; }
.nav-group-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0 12px 6px;
}
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-link {
  display: block;
  position: relative;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--sandstone);
  font-size: 14px;
  transition: color var(--transition), background var(--transition);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 1.5px;
  background: var(--amber-hover);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.nav-link:hover {
  background: var(--bg-card);
  color: var(--sandstone-light);
  text-decoration: none;
}
.nav-link:hover::after { transform: scaleX(1); }
.nav-link-active {
  background: var(--bg-card);
  color: var(--sandstone-light);
  font-weight: 500;
}
.nav-link-active::after { transform: scaleX(1); }

.content {
  padding: 32px 32px 80px;
  min-width: 0;
}

/* homepage hero */
.hero { padding: 24px 0 40px; position: relative; }
.hero h1 {
  font-size: 32px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
  color: var(--sandstone-light);
}
.tagline { color: var(--text-muted); font-size: 16px; margin: 0; }

.group-block { margin-bottom: 36px; }
.group-block + .group-block {
  position: relative;
  padding-top: 36px;
}
.group-block + .group-block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--sandstone-dark) 35%, var(--amber) 50%, var(--sandstone-dark) 65%, transparent);
  opacity: 0.5;
}
.group-heading {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 12px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 16px;
  color: var(--text-primary);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--amber);
  box-shadow: 0 4px 20px var(--amber-glow);
  text-decoration: none;
}
.card-title {
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--sandstone-light);
}

/* section / subsection pages */
.section-header { margin-bottom: 28px; }
.eyebrow {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.eyebrow a { color: var(--text-muted); }
.eyebrow a:hover { color: var(--amber-hover); }
.section-header h1 {
  font-size: 28px;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
  color: var(--sandstone-light);
}

.empty-state {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  color: var(--text-muted);
  text-align: center;
  transition: border-color var(--transition);
}
.empty-state:hover { border-color: var(--sandstone-dark); }

.block { margin-bottom: 32px; max-width: 720px; }
.block h2 {
  font-size: 18px;
  margin: 0 0 12px;
  color: var(--sandstone-light);
}
.block ul { padding-left: 20px; }
.block li { color: var(--text-primary); margin-bottom: 4px; }
.block h3 {
  font-size: 16px;
  color: var(--sandstone);
  margin: 28px 0 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}
.block h3:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.block h4 {
  font-size: 14px;
  color: var(--sandstone-light);
  margin: 18px 0 6px;
}
.block p { color: var(--text-primary); margin: 0 0 10px; }
.block code {
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--sandstone-light);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--border-subtle);
}
.block table.tools-table { margin-bottom: 8px; }

.block img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  margin: 12px 0 20px;
  display: block;
}
.block figure { margin: 12px 0 20px; }
.block figcaption {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

.attribution-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 760px;
}
.attribution-card {
  display: flex;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 14px;
}
.attribution-thumb {
  width: 120px;
  height: 90px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
  background: var(--bg);
}
.attribution-details { min-width: 0; }
.attribution-caption {
  color: var(--sandstone-light);
  font-weight: 500;
  margin-bottom: 4px;
}
.attribution-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.attribution-usedon {
  font-size: 12px;
  color: var(--sandstone-dark);
  line-height: 1.6;
}
@media (max-width: 600px) {
  .attribution-card { flex-direction: column; }
  .attribution-thumb { width: 100%; height: 160px; }
}

.callout {
  background: var(--bg);
  border: 1px solid var(--sandstone-dark);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 16px 0 24px;
}
.callout-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--amber-hover);
  font-weight: 600;
  margin: 0 0 8px;
}
.callout ul { margin: 0; padding-left: 18px; }
.callout li { color: var(--text-primary); margin-bottom: 4px; }

.tools-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
}
.tools-table th, .tools-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
}
.tools-table th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
}
.tools-table td { color: var(--text-primary); }
.tools-table tr:last-child td { border-bottom: none; }
.tools-table tr:hover td { background: rgba(196, 172, 133, 0.05); }

/* buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), color var(--transition);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--sandstone);
  color: var(--bg);
}
.btn-primary:hover {
  background: var(--sandstone-light);
  box-shadow: 0 0 0 3px var(--amber-glow);
  text-decoration: none;
}
.btn-secondary {
  background: transparent;
  border-color: var(--sandstone-dark);
  color: var(--sandstone);
}
.btn-secondary:hover {
  border-color: var(--amber-hover);
  color: var(--sandstone-light);
  text-decoration: none;
}

/* responsive */
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
  .site-nav.nav-open { display: block; }
}

/* site footer */
.site-footer {
  background: #1a1b1c;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
  padding: 18px 16px;
}