:root {
  --bg: #ffffff;
  --sidebar-bg: #f6f5f3;
  --text: #1f2328;
  --muted: #6e7781;
  --accent: #4f46e5;
  --accent-tint: #eef2ff;
  --border: #e5e7eb;
  --code-bg: #f6f8fa;
  --code-border: #d0d7de;
  --confirmed-bg: #dcfce7;
  --confirmed-text: #15803d;
  --general-bg: #f1f5f9;
  --general-text: #475569;
  --medium-bg: #fef3c7;
  --medium-text: #92400e;
  --hard-bg: #fee2e2;
  --hard-text: #b91c1c;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

code, pre, .mono {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */

.sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  height: 100vh;
  position: sticky;
  top: 0;
  overflow-y: auto;
  padding: 20px 0 40px;
}

.sidebar-header {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.sidebar-header a {
  text-decoration: none;
  color: var(--text);
}

.sidebar-header h1 {
  font-size: 15px;
  margin: 0 0 4px;
  font-weight: 700;
}

.sidebar-header p {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}

.sidebar-group {
  margin-top: 18px;
}

.sidebar-group-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 0 20px 6px;
}

.sidebar-group-subtitle {
  font-size: 11px;
  color: var(--muted);
  padding: 0 20px 8px;
  line-height: 1.4;
}

.sidebar ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar li a {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 6px 20px;
  text-decoration: none;
  color: var(--text);
  font-size: 13.5px;
  border-left: 3px solid transparent;
}

.sidebar li a:hover {
  background: #eeece8;
}

.sidebar li a.active {
  background: var(--accent-tint);
  border-left-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.sidebar li a .num {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  min-width: 20px;
  flex-shrink: 0;
}

.sidebar li a.active .num {
  color: var(--accent);
}

/* Main content */

.main {
  flex: 1;
  min-width: 0;
  padding: 48px 56px 96px;
}

.content {
  max-width: 800px;
  margin: 0 auto;
}

.content.wide {
  max-width: 900px;
}

.eyebrow {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 6px;
}

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

h1.title {
  font-size: 28px;
  margin: 0 0 12px;
  line-height: 1.25;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
}

.badge.confirmed { background: var(--confirmed-bg); color: var(--confirmed-text); }
.badge.general { background: var(--general-bg); color: var(--general-text); }
.badge.medium { background: var(--medium-bg); color: var(--medium-text); }
.badge.hard { background: var(--hard-bg); color: var(--hard-text); }
.badge.category { background: var(--accent-tint); color: var(--accent); }

.grounding {
  background: var(--accent-tint);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 14px;
  margin: 20px 0 28px;
}

.grounding strong {
  color: var(--accent);
}

/* Python syntax highlighting (applied by highlight.js) */
.tok-kw { color: #cf222e; font-weight: 600; }
.tok-str { color: #0a3069; }
.tok-com { color: #6e7781; font-style: italic; }
.tok-num { color: #0550ae; }
.tok-def { color: #8250df; font-weight: 600; }
.tok-deco { color: #8250df; }
.tok-builtin { color: #953800; }
.tok-self { color: #24292f; font-style: italic; }

/* Reference page (patterns.html): quick nav */
.quicknav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 8px;
}

.quicknav a {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 6px 16px;
  border-radius: 999px;
  text-decoration: none;
  white-space: nowrap;
}

.quicknav a:hover {
  background: #dfe3ff;
}

.content.wide section.block h2 {
  scroll-margin-top: 24px;
}

/* Complexity tables (patterns.html) */
.table-wrap {
  overflow-x: auto;
  margin: 12px 0 28px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table.ref-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

table.ref-table th, table.ref-table td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

table.ref-table tr:last-child td {
  border-bottom: none;
}

table.ref-table th {
  background: var(--code-bg);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

table.ref-table tr:nth-child(even) td {
  background: #fafaf9;
}

table.ref-table td:first-child {
  white-space: nowrap;
}

table.ref-table td:nth-child(2) {
  white-space: nowrap;
  font-weight: 600;
  color: var(--accent);
}

table.ref-table td code, table.ref-table th code {
  font-size: 0.92em;
}

/* Pattern catalog cards (patterns.html) */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
  margin: 20px 0 8px;
}

.pattern-card {
  background: #fff;
  border: 1px solid var(--border);
  border-left: 4px solid var(--fam-color, var(--accent));
  border-radius: 8px;
  padding: 16px 18px;
}

.pattern-card h3 {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--fam-color, var(--accent));
}

.pattern-card .field {
  margin: 0 0 11px;
}

.pattern-card .field:last-child {
  margin-bottom: 0;
}

.pattern-card .field-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 3px;
}

.pattern-card .field-value {
  font-size: 13.5px;
  line-height: 1.55;
}

section.block {
  margin: 36px 0;
}

section.block h2 {
  font-size: 19px;
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

section.block h3 {
  font-size: 15px;
  margin: 20px 0 8px;
}

p { margin: 0 0 14px; }

ul, ol.steps { margin: 0 0 14px; padding-left: 22px; }
ul li, ol.steps li { margin-bottom: 6px; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
  margin: 0 0 16px;
}

pre code {
  background: none;
  padding: 0;
}

p code, li code {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.88em;
}

.file-path {
  font-size: 12px;
  color: var(--muted);
  margin: -8px 0 12px;
}

.approach-box {
  background: #fafaf9;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
}

.nav-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}

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

.nav-footer a:hover { text-decoration: underline; }

.nav-footer .disabled {
  color: var(--border);
  pointer-events: none;
}

@media (max-width: 860px) {
  .layout { flex-direction: column; }
  .sidebar { position: relative; height: auto; width: 100%; }
  .main { padding: 32px 20px; }
}