/* ===================================================================
   LyreBirdAudio Documentation - Style Sheet
   Theme: Dark navy sidebar + clean white content
   =================================================================== */

/* ---------- Custom Properties ---------- */
:root {
  --sidebar-width: 270px;
  --topbar-height: 50px;

  /* Sidebar */
  --sidebar-bg: #1e2333;
  --sidebar-header-bg: #161b27;
  --sidebar-link: #9aabb8;
  --sidebar-link-hover: #d6e4f0;
  --sidebar-link-active: #ffffff;
  --sidebar-active-bg: rgba(78, 178, 118, 0.15);
  --sidebar-active-border: #4eb276;
  --sidebar-section: #5c7080;
  --sidebar-border: rgba(255,255,255,0.06);

  /* Top bar */
  --topbar-bg: #ffffff;
  --topbar-border: #e2e8f0;
  --topbar-shadow: 0 1px 3px rgba(0,0,0,0.08);

  /* Content */
  --content-bg: #ffffff;
  --content-text: #2d3748;
  --content-secondary: #718096;
  --content-max-width: 860px;

  /* Accent */
  --accent: #4eb276;
  --accent-dark: #3a9060;
  --accent-light: #edf7f0;

  /* Links */
  --link: #2b7cb8;
  --link-hover: #1a5c91;

  /* Code */
  --code-inline-bg: #edf2f7;
  --code-inline-text: #c7254e;
  --code-block-bg: #1a1f2e;
  --code-block-text: #abb2bf;
  --code-block-border: #2d3654;

  /* UI Elements */
  --border: #e2e8f0;
  --border-dark: #cbd5e0;
  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12);

  /* Callouts */
  --tip-bg: #f0fdf4;
  --tip-border: #4eb276;
  --tip-text: #15543a;
  --warning-bg: #fffbeb;
  --warning-border: #f6ad55;
  --warning-text: #7b4f12;
  --danger-bg: #fff5f5;
  --danger-border: #fc8181;
  --danger-text: #742a2a;
  --info-bg: #ebf8ff;
  --info-border: #63b3ed;
  --info-text: #2a4365;

  /* Tables */
  --table-header-bg: #f7fafc;
  --table-border: #e2e8f0;
  --table-stripe: #f7fafc;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--content-text);
  background: var(--content-bg);
  display: flex;
  min-height: 100vh;
}

/* ---------- Layout ---------- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 100;
  transition: transform 0.25s ease;
}

.content-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- Sidebar Header ---------- */
.sidebar-header {
  background: var(--sidebar-header-bg);
  padding: 18px 20px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}

.sidebar-logo-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.sidebar-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.sidebar-logo-name {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.01em;
}

.sidebar-logo-sub {
  font-size: 11px;
  color: #6b7a99;
  font-weight: 400;
}

/* ---------- Sidebar Search ---------- */
.sidebar-search {
  padding: 12px 14px;
  border-bottom: 1px solid var(--sidebar-border);
  position: relative;
}

.sidebar-search input {
  width: 100%;
  padding: 7px 10px 7px 32px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  color: #c9d1d9;
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

.sidebar-search input::placeholder { color: #5c7080; }
.sidebar-search input:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.1);
}

.sidebar-search-icon {
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: #5c7080;
  font-size: 13px;
  pointer-events: none;
}

/* Search results dropdown */
#search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 14px;
  right: 14px;
  background: #252d3d;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  z-index: 200;
  display: none;
  max-height: 400px;
  overflow-y: auto;
}

#search-results.visible { display: block; }

.search-result-item {
  display: block;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  text-decoration: none;
  transition: background 0.15s;
}

.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: rgba(255,255,255,0.06); }

.search-result-title {
  font-size: 13px;
  font-weight: 600;
  color: #c9d1d9;
  margin-bottom: 2px;
}

.search-result-section {
  font-size: 11px;
  color: #5c7080;
}

.search-result-excerpt {
  font-size: 12px;
  color: #7a8a9c;
  margin-top: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-empty {
  padding: 14px;
  text-align: center;
  color: #5c7080;
  font-size: 13px;
}

mark {
  background: rgba(78, 178, 118, 0.25);
  color: var(--accent);
  padding: 0 1px;
  border-radius: 2px;
}

/* ---------- Sidebar Navigation ---------- */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 24px;
}

.nav-section {
  margin-bottom: 2px;
}

.nav-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px 5px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sidebar-section);
  cursor: pointer;
  user-select: none;
}

.nav-section-header:hover { color: #8a9bb0; }

.nav-section-arrow {
  font-size: 9px;
  transition: transform 0.2s;
}

.nav-section.collapsed .nav-section-arrow { transform: rotate(-90deg); }
.nav-section.collapsed .nav-section-items { display: none; }

.nav-section-items { list-style: none; }

.nav-item a {
  display: block;
  padding: 6px 14px 6px 20px;
  font-size: 13.5px;
  color: var(--sidebar-link);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  line-height: 1.4;
}

.nav-item a:hover {
  color: var(--sidebar-link-hover);
  background: rgba(255,255,255,0.04);
}

.nav-item.active a {
  color: var(--sidebar-link-active);
  background: var(--sidebar-active-bg);
  border-left-color: var(--sidebar-active-border);
  font-weight: 600;
}

/* Sidebar footer */
.sidebar-footer {
  padding: 14px 18px;
  border-top: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-footer-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-footer a {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: #5c7080;
  text-decoration: none;
  transition: color 0.15s;
}

.sidebar-footer a:hover { color: #9aabb8; }
.sidebar-footer a .icon { font-size: 14px; }

/* ---------- Top Bar ---------- */
.topbar {
  height: var(--topbar-height);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--topbar-border);
  box-shadow: var(--topbar-shadow);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--content-secondary);
  font-size: 20px;
  padding: 4px;
  line-height: 1;
}

.topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--content-secondary);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.topbar-breadcrumb a {
  color: var(--content-secondary);
  text-decoration: none;
}

.topbar-breadcrumb a:hover { color: var(--link); }
.topbar-breadcrumb .sep { opacity: 0.4; }
.topbar-breadcrumb .current { color: var(--content-text); font-weight: 500; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  font-size: 13px;
  color: var(--content-secondary);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  white-space: nowrap;
}

.topbar-btn:hover {
  color: var(--content-text);
  border-color: var(--border-dark);
  background: #f7fafc;
}

/* ---------- Main Content ---------- */
.content {
  flex: 1;
  padding: 40px 48px;
  max-width: calc(var(--content-max-width) + 96px);
  width: 100%;
}

/* Page header */
.page-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.page-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.page-title {
  font-size: 32px;
  font-weight: 800;
  color: #1a202c;
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 17px;
  color: var(--content-secondary);
  line-height: 1.6;
  max-width: 680px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
  color: #1a202c;
  font-weight: 700;
  line-height: 1.3;
  scroll-margin-top: 72px;
}

h2 {
  font-size: 22px;
  margin: 40px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

h2:first-child { margin-top: 0; }

h3 {
  font-size: 17px;
  margin: 28px 0 10px;
  color: #2d3748;
}

h4 {
  font-size: 15px;
  margin: 20px 0 8px;
  font-weight: 600;
  color: #4a5568;
}

p { margin-bottom: 16px; }
p:last-child { margin-bottom: 0; }

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

strong { font-weight: 600; color: #2d3748; }
em { font-style: italic; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

/* ---------- Lists ---------- */
ul, ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

li {
  margin-bottom: 5px;
  line-height: 1.65;
}

li > ul, li > ol {
  margin-top: 5px;
  margin-bottom: 5px;
}

/* Definition list / dl */
dl { margin-bottom: 16px; }
dt {
  font-weight: 600;
  color: #2d3748;
  margin-top: 12px;
}
dd {
  padding-left: 20px;
  color: var(--content-secondary);
}

/* ---------- Code ---------- */
code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 13.5px;
  background: var(--code-inline-bg);
  color: var(--code-inline-text);
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid rgba(0,0,0,0.06);
}

pre {
  background: var(--code-block-bg);
  border: 1px solid var(--code-block-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 16px 0 20px;
  position: relative;
}

pre code {
  font-size: 13px;
  background: none;
  color: var(--code-block-text);
  padding: 0;
  border: none;
  border-radius: 0;
  line-height: 1.65;
}

/* Code copy button */
.code-wrapper { position: relative; }

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  color: #7a8a9c;
  font-size: 11px;
  padding: 3px 8px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  font-family: inherit;
}

.copy-btn:hover {
  background: rgba(255,255,255,0.14);
  color: #c9d1d9;
}

.copy-btn.copied { color: var(--accent); }

/* Syntax highlighting tokens */
.token-comment { color: #5c6370; font-style: italic; }
.token-keyword { color: #c678dd; }
.token-string { color: #98c379; }
.token-number { color: #d19a66; }
.token-function { color: #61afef; }
.token-variable { color: #e06c75; }
.token-operator { color: #56b6c2; }
.token-flag { color: #e5c07b; }

/* ---------- Tables ---------- */
.table-wrapper {
  overflow-x: auto;
  margin: 16px 0 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--table-border);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead tr {
  background: var(--table-header-bg);
}

th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  color: #4a5568;
  border-bottom: 1px solid var(--table-border);
  white-space: nowrap;
}

td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--table-border);
  vertical-align: top;
}

tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) { background: var(--table-stripe); }
tbody tr:hover { background: #f0f4f8; }

td code { font-size: 12.5px; }

/* ---------- Callouts ---------- */
.callout {
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin: 20px 0;
  border-left: 4px solid;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.callout-icon {
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.callout-body { flex: 1; min-width: 0; }
.callout-body > *:last-child { margin-bottom: 0; }

.callout p { margin-bottom: 8px; }
.callout p:last-child { margin-bottom: 0; }

.callout strong { display: block; margin-bottom: 4px; }

.callout.tip {
  background: var(--tip-bg);
  border-color: var(--tip-border);
  color: var(--tip-text);
}

.callout.warning {
  background: var(--warning-bg);
  border-color: var(--warning-border);
  color: var(--warning-text);
}

.callout.danger {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-text);
}

.callout.info {
  background: var(--info-bg);
  border-color: var(--info-border);
  color: var(--info-text);
}

/* ---------- Badges / Chips ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.badge-green { background: #dcf5e9; color: #256940; }
.badge-blue { background: #dbeeff; color: #1a4f8a; }
.badge-orange { background: #fff0db; color: #7a4a0a; }
.badge-red { background: #ffe5e5; color: #7a1a1a; }
.badge-gray { background: #edf2f7; color: #4a5568; }

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.2s;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card-icon { font-size: 28px; margin-bottom: 12px; }
.card-title {
  font-size: 15px;
  font-weight: 700;
  color: #1a202c;
  margin-bottom: 6px;
}
.card-desc {
  font-size: 13.5px;
  color: var(--content-secondary);
  line-height: 1.5;
}

/* Feature list */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  margin: 0;
}

.feature-list li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ---------- Step list ---------- */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 20px 0; }

.steps li {
  counter-increment: step;
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.steps li::before {
  content: counter(step);
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  margin-top: 2px;
}

.steps li > div { flex: 1; }
.steps li strong { display: block; margin-bottom: 4px; }

/* ---------- Command reference ---------- */
.command-ref {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 16px 0;
}

.command-ref-header {
  background: var(--table-header-bg);
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #4a5568;
  border-bottom: 1px solid var(--border);
}

.command-row {
  display: flex;
  align-items: flex-start;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.command-row:last-child { border-bottom: none; }
.command-row:nth-child(even) { background: var(--table-stripe); }

.command-name {
  font-family: monospace;
  font-size: 13px;
  color: var(--code-inline-text);
  min-width: 140px;
  background: var(--code-inline-bg);
  padding: 2px 7px;
  border-radius: 4px;
  flex-shrink: 0;
}

.command-desc {
  font-size: 13.5px;
  color: var(--content-secondary);
  flex: 1;
}

/* ---------- TOC (Table of Contents) ---------- */
.toc {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  margin-bottom: 32px;
}

.toc-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--content-secondary);
  margin-bottom: 10px;
}

.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list li { margin-bottom: 4px; }
.toc-list a {
  font-size: 13.5px;
  color: var(--link);
  text-decoration: none;
}

.toc-list a:hover { text-decoration: underline; }
.toc-list .toc-sub {
  padding-left: 16px;
  margin-top: 3px;
}

.toc-list .toc-sub a { color: var(--content-secondary); }

/* ---------- Version badge ---------- */
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(78, 178, 118, 0.12);
  border: 1px solid rgba(78, 178, 118, 0.3);
  color: var(--accent-dark);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 600;
  font-family: monospace;
}

/* ---------- Page navigation (prev/next) ---------- */
.page-nav {
  border-top: 1px solid var(--border);
  padding: 24px 48px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  background: #fafbfc;
}

.page-nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: white;
  transition: border-color 0.2s, box-shadow 0.2s;
  min-width: 0;
  max-width: 320px;
}

.page-nav-btn:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.page-nav-btn.next { margin-left: auto; text-align: right; }

.page-nav-btn-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--content-secondary);
  display: block;
}

.page-nav-btn-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--content-text);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-nav-arrow {
  font-size: 20px;
  color: var(--content-secondary);
  flex-shrink: 0;
}

/* ---------- Hero (index page) ---------- */
.hero {
  background: linear-gradient(135deg, #1e2333 0%, #252d42 100%);
  border-radius: var(--radius-lg);
  padding: 40px 44px;
  margin-bottom: 40px;
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '🎙️';
  position: absolute;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 100px;
  opacity: 0.08;
}

.hero-label {
  display: inline-block;
  background: rgba(78, 178, 118, 0.2);
  border: 1px solid rgba(78, 178, 118, 0.4);
  color: #6ddb9a;
  border-radius: 20px;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: 34px;
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 16px;
  color: #9aabb8;
  line-height: 1.65;
  max-width: 540px;
  margin-bottom: 24px;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12.5px;
  color: #c9d1d9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-dark);
  text-decoration: none;
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(78, 178, 118, 0.3);
}

.btn-secondary {
  background: rgba(255,255,255,0.1);
  color: #e6eaf0;
  border: 1px solid rgba(255,255,255,0.15);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.15);
  color: white;
  text-decoration: none;
}

/* ---------- Sidebar overlay (mobile) ---------- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
}

/* ---------- Scrollbar styling ---------- */
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
.sidebar::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ---------- Anchor links ---------- */
.anchor-link {
  opacity: 0;
  margin-left: 6px;
  color: var(--border-dark);
  font-size: 0.85em;
  text-decoration: none;
  transition: opacity 0.15s;
}

h2:hover .anchor-link,
h3:hover .anchor-link,
h4:hover .anchor-link { opacity: 1; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-md);
  }

  .sidebar-overlay.visible { display: block; }

  .content-wrapper { margin-left: 0; }

  .topbar-toggle { display: flex; }

  .content { padding: 24px 20px; }

  .page-nav { padding: 16px 20px; }

  .hero { padding: 28px 24px; }
  .hero::before { display: none; }
  .hero h1 { font-size: 24px; }

  .card-grid { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }

  .page-nav-btn { max-width: none; }
}

@media (max-width: 600px) {
  .hero-badges { display: none; }
  .topbar-actions { display: none; }
  .page-nav { flex-direction: column; }
  .page-nav-btn.next { margin-left: 0; }
}

/* ---------- Print ---------- */
@media print {
  .sidebar, .topbar, .page-nav, .topbar-toggle { display: none !important; }
  .content-wrapper { margin-left: 0; }
  .content { padding: 0; }
}