/* OGGM Source Code Deep Analysis - Professional Book Style */
:root {
  --primary: #1a5276;
  --secondary: #2e86c1;
  --accent: #e74c3c;
  --bg: #fdfdfd;
  --text: #2c3e50;
  --code-bg: #f4f6f8;
  --border: #d5dbdb;
  --note-bg: #eaf2f8;
  --warning-bg: #fef9e7;
  --tip-bg: #e8f8f5;
  --sidebar-bg: #f8f9fa;
  --highlight: #f1c40f;
  --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

/* ---- Layout ---- */
#sidebar {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: 320px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 24px;
  z-index: 100;
}

#main {
  margin-left: 320px;
  max-width: 960px;
  padding: 40px 60px 80px;
}

/* ---- Sidebar TOC ---- */
#sidebar h2 {
  font-size: 1.1rem;
  color: var(--primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--secondary);
}

#sidebar .part-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 20px 0 6px;
}

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

#sidebar ol li {
  margin: 2px 0;
}

#sidebar ol li a {
  display: block;
  padding: 4px 8px;
  font-size: 0.9rem;
  color: #555;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.15s;
}

#sidebar ol li a:hover {
  background: #e1ecf4;
  color: var(--primary);
}

#sidebar ol li a.active {
  background: var(--secondary);
  color: #fff;
  font-weight: 600;
}

/* ---- Typography ---- */
h1 { font-size: 2.4rem; color: var(--primary); margin: 0 0 8px; }
h1.book-title { font-size: 2.8rem; text-align: center; margin: 40px 0 8px; }
h2 { font-size: 1.6rem; color: var(--primary); margin: 40px 0 16px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.25rem; color: var(--secondary); margin: 28px 0 12px; }
h4 { font-size: 1.05rem; color: #444; margin: 20px 0 8px; }

p { margin: 12px 0; }

a { color: var(--secondary); text-decoration: none; }
a:hover { text-decoration: underline; }

.subtitle {
  text-align: center;
  font-size: 1.15rem;
  color: #666;
  margin-bottom: 8px;
}

.audience {
  text-align: center;
  font-size: 0.95rem;
  color: #888;
  margin-bottom: 40px;
}

/* ---- Code ---- */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
  color: #c7254e;
}

pre {
  background: #282c34;
  color: #abb2bf;
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 18px 22px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 16px 0;
  line-height: 1.5;
}

pre code {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* Syntax highlighting tokens */
.kw { color: #c678dd; font-weight: bold; }
.fn { color: #61afef; }
.str { color: #98c379; }
.num { color: #d19a66; }
.cmt { color: #5c6370; font-style: italic; }
.dec { color: #e5c07b; }

/* ---- Callout Boxes ---- */
.callout {
  margin: 20px 0;
  padding: 14px 20px;
  border-left: 4px solid var(--secondary);
  background: var(--note-bg);
  border-radius: 0 6px 6px 0;
}

.callout.warning {
  border-left-color: #f39c12;
  background: var(--warning-bg);
}

.callout.tip {
  border-left-color: #27ae60;
  background: var(--tip-bg);
}

.callout.expert {
  border-left-color: var(--accent);
  background: #fdedec;
}

.callout.pathway {
  border-left-color: #8e44ad;
  background: #f4ecf7;
}

.callout.practice {
  border-left-color: #2980b9;
  background: #eaf2f8;
}

.callout.local {
  border-left-color: #16a085;
  background: #e8f8f5;
}

.callout.author {
  border-left-color: #34495e;
  background: #f4f6f7;
}

.callout-title {
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--primary);
}

.reader-map td:first-child,
.quick-output td:first-child {
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

/* ---- Tables ---- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.92em;
}

thead th {
  background: var(--primary);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}

tbody td {
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
}

tbody tr:nth-child(even) { background: #f8f9fa; }
tbody tr:hover { background: #eaf2f8; }

/* ---- Architecture Diagram Placeholder ---- */
.arch-diagram {
  background: var(--code-bg);
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 30px;
  margin: 24px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: #666;
  white-space: pre;
}

/* ---- Navigation ---- */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  margin: 50px 0 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 0.9em;
}

.chapter-nav a { color: var(--secondary); }

/* ---- Footer ---- */
footer {
  text-align: center;
  color: #999;
  font-size: 0.85em;
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* ---- Tag markers ---- */
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 0.78em;
  font-weight: 600;
  margin-right: 6px;
}

.tag-beginner { background: #d5f5e3; color: #1e8449; }
.tag-intermediate { background: #fdebd0; color: #b9770e; }
.tag-advanced { background: #fadbd8; color: #c0392b; }

/* ---- Search ---- */
#search-box {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.9rem;
  margin-bottom: 16px;
  font-family: var(--font-sans);
}

/* ---- Print ---- */
@media print {
  #sidebar { display: none; }
  #main { margin-left: 0; max-width: 100%; padding: 20px; }
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  #sidebar { display: none; }
  #main { margin-left: 0; padding: 20px; }
}