/* NextTest Book Reader Styles */
:root {
  --bg-app: #f5f4ef;
  --bg-page: #ffffff;
  --bg-sidebar: #f8f7f2;
  --text-main: #24292f;
  --text-muted: #57606a;
  --text-light: #8c959f;
  --border-color: #e1dfd7;
  --accent: #6f9116;
  --accent-light: #eef5d8;
  --code-bg: #1e2426;
  --code-text: #e6edf3;
  --callout-bg: #f3f7e8;
  --callout-border: #a9cf34;
  --sidebar-w: 290px;
  --reader-font: "Georgia", "Cambria", "Times New Roman", serif;
  --ui-font: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono-font: "DM Mono", "SFMono-Regular", Consolas, monospace;
}

[data-theme="sepia"] {
  --bg-app: #ede4ce;
  --bg-page: #fbf5e6;
  --bg-sidebar: #f3ebd5;
  --text-main: #423425;
  --text-muted: #6e5b47;
  --text-light: #94806b;
  --border-color: #dfd3b9;
  --accent: #916824;
  --accent-light: #f0e3c8;
  --code-bg: #2b231a;
  --code-text: #f7ede1;
  --callout-bg: #faefe0;
  --callout-border: #c4994b;
}

[data-theme="dark"] {
  --bg-app: #0f1214;
  --bg-page: #161b1e;
  --bg-sidebar: #131719;
  --text-main: #e6edf3;
  --text-muted: #9ba6b2;
  --text-light: #6e7984;
  --border-color: #272f33;
  --accent: #a9cf34;
  --accent-light: #243015;
  --code-bg: #0b0e10;
  --code-text: #f0f6fc;
  --callout-bg: #1c2619;
  --callout-border: #628214;
}

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

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--ui-font);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.book-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-page);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.book-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 16px;
}

.book-brand img {
  height: 28px;
  width: auto;
}

.book-badge {
  background: var(--accent-light);
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-selector {
  display: flex;
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 3px;
}

.theme-btn {
  background: none;
  border: none;
  padding: 4px 10px;
  font-size: 13px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s;
}

.theme-btn.active {
  background: var(--bg-page);
  color: var(--text-main);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.font-controls {
  display: flex;
  gap: 4px;
}

.ctrl-btn {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: 0.2s;
}

.ctrl-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-link-btn {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  transition: 0.2s;
}

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

.menu-drawer-btn {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-main);
}

/* Layout */
.book-layout {
  display: flex;
  flex: 1;
  max-width: 1500px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar */
.book-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
  overflow-y: auto;
  padding: 24px 16px;
}

.toc-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-light);
  margin-bottom: 12px;
  padding-left: 8px;
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.toc-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.4;
  transition: all 0.15s ease;
}

.toc-item:hover {
  background: var(--bg-page);
  color: var(--text-main);
}

.toc-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.toc-item .mod-num {
  font-family: var(--mono-font);
  font-size: 11px;
  opacity: 0.8;
  flex-shrink: 0;
  margin-top: 1px;
}

.toc-item .mod-title {
  flex: 1;
}

/* Reading Canvas */
.book-content {
  flex: 1;
  padding: 40px 48px;
  display: flex;
  justify-content: center;
}

.reading-canvas {
  max-width: 820px;
  width: 100%;
  background: var(--bg-page);
  padding: 48px 56px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}

/* Book Cover Hero */
.book-cover {
  border-bottom: 2px dashed var(--border-color);
  padding-bottom: 36px;
  margin-bottom: 48px;
  text-align: center;
}

.cover-kicker {
  font-size: 12px;
  letter-spacing: 2px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.book-title {
  font-family: var(--reader-font);
  font-size: 36px;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 14px;
}

.book-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 20px;
}

.book-meta-bar {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 12px;
  color: var(--text-light);
  flex-wrap: wrap;
}

.book-meta-bar span b {
  color: var(--text-muted);
}

/* Chapter Layout */
.book-chapter {
  padding-top: 36px;
  margin-top: 36px;
  border-top: 1px solid var(--border-color);
}

.chapter-badge {
  font-family: var(--mono-font);
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: inline-block;
}

.chapter-title {
  font-family: var(--reader-font);
  font-size: 26px;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--text-main);
}

.chapter-body p {
  font-family: var(--reader-font);
  font-size: var(--body-fs, 17px);
  line-height: 1.8;
  margin-bottom: 20px;
  color: var(--text-main);
}

.chapter-body h3 {
  font-family: var(--ui-font);
  font-size: 19px;
  font-weight: 700;
  margin: 32px 0 14px;
  color: var(--text-main);
}

.chapter-body ul, .chapter-body ol {
  font-family: var(--reader-font);
  font-size: var(--body-fs, 17px);
  line-height: 1.8;
  margin: 0 0 24px 28px;
  color: var(--text-main);
}

.chapter-body li {
  margin-bottom: 8px;
}

/* Callout Box */
.callout {
  border-left: 4px solid var(--callout-border);
  background: var(--callout-bg);
  padding: 18px 22px;
  border-radius: 0 10px 10px 0;
  margin: 24px 0;
  font-family: var(--ui-font);
  font-size: 14px;
  line-height: 1.6;
}

.callout-title {
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.callout p {
  font-family: var(--ui-font) !important;
  font-size: 14px !important;
  margin-bottom: 0 !important;
  color: var(--text-main) !important;
}

/* Code Snippets */
.code-box {
  background: var(--code-bg);
  border-radius: 10px;
  margin: 22px 0;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
}

.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: rgba(0,0,0,0.25);
  font-family: var(--mono-font);
  font-size: 12px;
  color: #8b949e;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.code-copy-btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.15);
  color: #c9d1d9;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.2s;
}

.code-copy-btn:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

pre {
  margin: 0;
  padding: 16px 20px;
  overflow-x: auto;
}

code {
  font-family: var(--mono-font);
  font-size: 13.5px;
  color: var(--code-text);
  line-height: 1.5;
}

p code, li code {
  background: #edf2f7;
  color: #0f172a;
  border: 1px solid #cbd5e1;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13.5px;
  font-weight: 600;
}

[data-theme="sepia"] p code, [data-theme="sepia"] li code {
  background: #eedfc5;
  color: #2e1d0c;
  border-color: #d6be9a;
}

[data-theme="dark"] p code, [data-theme="dark"] li code {
  background: #1e293b;
  color: #f8fafc;
  border-color: #475569;
}

/* Table */
.data-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
}

.book-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  font-family: var(--ui-font);
}

.book-table th {
  background: var(--bg-app);
  text-align: left;
  padding: 12px 14px;
  border-bottom: 2px solid var(--border-color);
  font-weight: 700;
  color: var(--text-main);
}

.book-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

/* Action column - Bold, Dark & High-Contrast */
.book-table td:first-child code {
  display: inline-block;
  background: #f1f5f9;
  color: #090d16;
  border: 1.5px solid #94a3b8;
  border-radius: 5px;
  padding: 3px 8px;
  font-family: var(--mono-font);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}

.book-table td code {
  font-family: var(--mono-font);
  font-size: 13px;
  color: #0f172a;
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

[data-theme="sepia"] .book-table td:first-child code {
  background: #ebdcc2;
  color: #1e1307;
  border-color: #bfa67f;
  font-weight: 700;
}

[data-theme="sepia"] .book-table td code {
  color: #2e1d0c;
  background: #f4e9d3;
  border-color: #dfd1b8;
}

[data-theme="dark"] .book-table td:first-child code {
  background: #1e293b;
  color: #ffffff;
  border-color: #64748b;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .book-table td code {
  color: #f1f5f9;
  background: #0f172a;
  border-color: #334155;
}

/* Chapter Bottom Navigation */
.chapter-nav-row {
  display: flex;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.chapter-nav-btn {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-page);
  color: var(--text-main);
  transition: all 0.2s;
}

.chapter-nav-btn:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.chapter-nav-btn small {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.chapter-nav-btn span {
  font-weight: 600;
  font-size: 14px;
}

/* Mobile responsive */
@media (max-width: 900px) {
  .book-sidebar {
    position: fixed;
    top: 60px;
    left: -100%;
    z-index: 99;
    transition: left 0.3s ease;
    box-shadow: 4px 0 20px rgba(0,0,0,0.15);
  }

  .book-sidebar.open {
    left: 0;
  }

  .menu-drawer-btn {
    display: block;
  }

  .book-content {
    padding: 20px 16px;
  }

  .reading-canvas {
    padding: 28px 20px;
  }

  .book-title {
    font-size: 28px;
  }
}