/* ==========================================================================
   AI WORKFLOW ENGINEER WIKI & LEARNING HUB — STYLES
   Design System: Hybrid Duotone (Andrea Gonzalez Otto Brand System)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,600;700;800&family=Plus+Jakarta+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Space+Mono:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  /* Brand Tokens */
  --cyan-neon: #4FD8E3;
  --cyan-dark: #0E8E9B;
  --cyan-tint: #E6FAFC;
  --magenta-neon: #F01C86;
  --magenta-tint: #FDE8F3;
  --ink-dark: #1A1F26;
  --muted-grey: #5B6672;
  --border-color: #1A1F26;
  --card-bg: #FFFFFF;
  --bg-app: #EEFBFD;
  --sidebar-bg: #FFFFFF;
  --code-bg: #141922;
  --code-text: #E6EDF3;
  
  /* Levels Accent */
  --lvl-junior: #059669;
  --lvl-junior-bg: #D1FAE5;
  --lvl-mid: #0284C7;
  --lvl-mid-bg: #E0F2FE;
  --lvl-senior: #7C3AED;
  --lvl-senior-bg: #EDE9FE;

  /* Fonts */
  --font-heading: 'Bricolage Grotesque', sans-serif;
  --font-mono: 'Space Mono', monospace;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  /* Borders & Shadows */
  --border-hard: 2px solid var(--border-color);
  --border-subtle: 1px solid rgba(26, 31, 38, 0.15);
  --shadow-solid: 4px 4px 0px var(--border-color);
  --shadow-solid-sm: 2px 2px 0px var(--border-color);
  --shadow-solid-lg: 6px 6px 0px var(--border-color);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 9999px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode Theme */
[data-theme="dark"] {
  --bg-app: #0B0E14;
  --card-bg: #141922;
  --sidebar-bg: #0F131A;
  --ink-dark: #F0F6FC;
  --muted-grey: #8B949E;
  --border-color: #30363D;
  --border-subtle: 1px solid #30363D;
  --cyan-tint: rgba(79, 216, 227, 0.12);
  --magenta-tint: rgba(240, 28, 134, 0.12);
  --code-bg: #090D13;
  --shadow-solid: 4px 4px 0px #30363D;
  --shadow-solid-sm: 2px 2px 0px #30363D;
  --shadow-solid-lg: 6px 6px 0px #30363D;
  
  /* Levels in dark mode */
  --lvl-junior-bg: rgba(5, 150, 105, 0.2);
  --lvl-junior: #34D399;
  --lvl-mid-bg: rgba(2, 132, 199, 0.2);
  --lvl-mid: #38BDF8;
  --lvl-senior-bg: rgba(124, 58, 237, 0.2);
  --lvl-senior: #A78BFA;
}

/* HIGH-CONTRAST TEXT ACCESSIBILITY ON NEON CYAN */
.nav-item-btn.active,
.nav-item-btn.active *,
.portfolio-link,
.topic-tag,
.glossary-abbr-pill {
  color: #1A1F26 !important;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-app);
  color: var(--ink-dark);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--muted-grey);
  border-radius: 4px;
}

/* Layout App Shell */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 64px;
  background: var(--sidebar-bg);
  border-bottom: var(--border-hard);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink-dark);
}

.brand-badge {
  background: #1A1F26;
  color: var(--cyan-neon);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: -0.02em;
  border: 1px solid rgba(79, 216, 227, 0.3);
}

[data-theme="dark"] .brand-badge {
  background: var(--cyan-neon);
  color: #1A1F26;
  border-color: var(--cyan-neon);
  font-weight: 800;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-title span {
  color: var(--magenta-neon);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-search {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-app);
  border: var(--border-hard);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted-grey);
  cursor: pointer;
  transition: var(--transition);
}

.btn-search:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-solid-sm);
  color: var(--ink-dark);
}

.search-kbd {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
}

.theme-toggle, .btn-icon {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--ink-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover, .btn-icon:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-solid-sm);
}

.portfolio-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  color: #1A1F26 !important;
  border: var(--border-hard);
  background: var(--cyan-neon);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  box-shadow: var(--shadow-solid-sm);
  transition: var(--transition);
}

.portfolio-link:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-solid);
}

/* Topic Pagination Navigation Buttons */
.pagination-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  text-decoration: none;
}

.pagination-prev {
  background: #1A1F26;
  color: #FFFFFF !important;
  border: 2px solid var(--border-color);
  box-shadow: 2px 2px 0px var(--cyan-neon);
}

[data-theme="dark"] .pagination-prev {
  background: #141922;
  border-color: #30363D;
  color: #FFFFFF !important;
}

.pagination-prev:hover {
  background: #000000;
  color: #FFFFFF !important;
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0px var(--magenta-neon);
}

.pagination-next {
  background: var(--cyan-neon);
  color: #1A1F26 !important;
  border: 2px solid #1A1F26;
  box-shadow: 2px 2px 0px #1A1F26;
}

.pagination-next:hover {
  background: #6EE7F0;
  color: #1A1F26 !important;
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0px #1A1F26;
}

/* Dark Mode explicit overrides */
[data-theme="dark"] .pagination-prev {
  background: rgba(255, 255, 255, 0.08);
  color: #FFFFFF !important;
  border: 2px solid rgba(255, 255, 255, 0.35);
  box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .pagination-prev:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: #FFFFFF;
  color: #FFFFFF !important;
  box-shadow: 3px 3px 0px var(--cyan-neon);
  transform: translate(-2px, -2px);
}

/* App Body Grid */
.app-container {
  display: grid;
  grid-template-columns: 280px 1fr 240px;
  min-height: calc(100vh - 64px);
  max-width: 1680px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar Navigation */
.app-sidebar {
  background: var(--sidebar-bg);
  border-right: var(--border-hard);
  padding: 24px 16px;
  overflow-y: auto;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
}

.nav-section-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-grey);
  margin: 18px 8px 8px 8px;
}

.nav-menu-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--ink-dark);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.nav-item-btn:hover {
  background: var(--cyan-tint);
  border-color: var(--cyan-dark);
  color: var(--cyan-dark);
}

.nav-item-btn.active {
  background: var(--cyan-neon);
  border: var(--border-hard);
  color: #1A1F26 !important;
  box-shadow: var(--shadow-solid-sm);
}

.nav-item-btn.active * {
  color: #1A1F26 !important;
}

.nav-item-btn.active .nav-module-badge {
  background: rgba(26, 31, 38, 0.2) !important;
  color: #1A1F26 !important;
}

.nav-module-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 2px 6px;
  background: rgba(0,0,0,0.06);
  border-radius: 4px;
  font-weight: 700;
}

/* Main Content Workspace */
.app-main {
  padding: 40px 48px;
  overflow-y: auto;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

/* Right TOC */
.app-toc {
  border-left: var(--border-hard);
  background: var(--sidebar-bg);
  padding: 24px 16px;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  font-size: 0.85rem;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--muted-grey);
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-link {
  text-decoration: none;
  color: var(--muted-grey);
  font-family: var(--font-body);
  transition: var(--transition);
  display: block;
  line-height: 1.4;
}

.toc-link:hover {
  color: var(--magenta-neon);
  transform: translateX(3px);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted-grey);
  margin-bottom: 16px;
}

.breadcrumb-item {
  color: var(--muted-grey);
  text-decoration: none;
}

.breadcrumb-item.current {
  color: var(--ink-dark);
  font-weight: 700;
}

/* Module Banner */
.topic-header-card {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-solid);
  position: relative;
  overflow: hidden;
}

.topic-header-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan-neon), var(--magenta-neon));
}

.topic-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--cyan-neon);
  color: #1A1F26;
  border: var(--border-hard);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
}

.topic-tag.tag-magenta {
  background: var(--magenta-neon);
  color: #FFFFFF !important;
  border-color: #1A1F26;
}

.topic-tag.tag-cyan {
  background: var(--cyan-neon);
  color: #1A1F26 !important;
  border-color: #1A1F26;
}

.topic-tag.tag-dark {
  background: var(--ink-dark);
  color: #FFFFFF !important;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] .topic-tag.tag-dark {
  background: rgba(255, 255, 255, 0.15);
  color: #FFFFFF !important;
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.topic-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.topic-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted-grey);
}

/* Cognitive Level Selector Bar */
.level-selector-container {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-lg);
  padding: 6px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-solid-sm);
}

.level-btn {
  background: transparent;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  cursor: pointer;
  color: var(--muted-grey);
  transition: var(--transition);
}

.level-btn:hover {
  background: rgba(0,0,0,0.03);
  color: var(--ink-dark);
}

.level-btn.active.lvl-junior {
  background: var(--lvl-junior-bg);
  border-color: var(--lvl-junior);
  color: var(--lvl-junior);
  box-shadow: var(--shadow-solid-sm);
}

.level-btn.active.lvl-mid {
  background: var(--lvl-mid-bg);
  border-color: var(--lvl-mid);
  color: var(--lvl-mid);
  box-shadow: var(--shadow-solid-sm);
}

.level-btn.active.lvl-senior {
  background: var(--lvl-senior-bg);
  border-color: var(--lvl-senior);
  color: var(--lvl-senior);
  box-shadow: var(--shadow-solid-sm);
}

/* Topic Content Panels */
.content-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}

.content-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Feature Cards & Boxes */
.feature-box {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-solid);
}

.feature-box-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.analogy-box {
  background: var(--cyan-tint);
  border: var(--border-hard);
  border-left: 6px solid var(--cyan-dark);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.tradeoff-box {
  background: var(--magenta-tint);
  border: var(--border-hard);
  border-left: 6px solid var(--magenta-neon);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
}

/* Code Snippet */
.code-container {
  background: var(--code-bg);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-solid);
}

.code-header {
  background: rgba(255,255,255,0.06);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #8B949E;
}

.code-block {
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--code-text);
  overflow-x: auto;
}

.btn-copy {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  border-radius: 4px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy:hover {
  background: var(--cyan-neon);
  color: #000;
}

/* Takeaway list */
.styled-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.styled-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 1.05rem;
}

.styled-list li::before {
  content: '✦';
  color: var(--magenta-neon);
  font-weight: bold;
  flex-shrink: 0;
}

/* Glossary Section Styles */
.glossary-controls {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-solid);
}

.glossary-search-input {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 1rem;
  background: var(--bg-app);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  color: var(--ink-dark);
  margin-bottom: 16px;
  outline: none;
}

.glossary-search-input:focus {
  border-color: var(--magenta-neon);
  box-shadow: var(--shadow-solid-sm);
}

.category-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.category-chip {
  background: var(--bg-app);
  border: var(--border-hard);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  color: var(--ink-dark);
}

.category-chip.active, .category-chip:hover {
  background: var(--cyan-neon);
  color: #1A1F26 !important;
  border-color: #1A1F26;
  transform: translateY(-2px);
  box-shadow: var(--shadow-solid-sm);
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.glossary-card {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-solid);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.glossary-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-solid-lg);
}

.glossary-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.glossary-term-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
}

.glossary-abbr-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--cyan-neon);
  color: #1A1F26 !important;
  border: 1px solid var(--border-color);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  flex-shrink: 0;
}

.glossary-def {
  font-size: 0.95rem;
  color: var(--ink-dark);
  margin-bottom: 16px;
  line-height: 1.5;
}

.glossary-deep {
  font-size: 0.85rem;
  color: var(--muted-grey);
  border-top: 1px dashed var(--border-color);
  padding-top: 12px;
  margin-bottom: 14px;
}

.glossary-meta-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-grey);
}

/* Interactive Simulator */
.simulator-card {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-solid);
}

.sim-slider-container {
  display: flex;
  align-items: center;
  gap: 20px;
  margin: 20px 0;
}

.sim-slider {
  flex: 1;
  height: 8px;
  border-radius: 4px;
  background: #E2E8F0;
  accent-color: var(--magenta-neon);
  cursor: pointer;
}

.latency-bars {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.bar-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bar-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.bar-track {
  height: 28px;
  background: var(--bg-app);
  border: var(--border-hard);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.bar-fill {
  height: 100%;
  transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: #000;
}

.bar-seq { background: #CBD5E1; }
.bar-sot { background: var(--cyan-neon); }

/* Modal Search */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}

.search-modal-backdrop.open {
  display: flex;
}

.search-modal {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 640px;
  box-shadow: var(--shadow-solid-lg);
  overflow: hidden;
  animation: modalPop 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalPop {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-search-input {
  width: 100%;
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  border: none;
  border-bottom: var(--border-hard);
  background: transparent;
  color: var(--ink-dark);
  outline: none;
}

.modal-results-list {
  max-height: 400px;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.search-result-item {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-decoration: none;
  color: var(--ink-dark);
  display: flex;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  transition: var(--transition);
}

.search-result-item:hover, .search-result-item.active {
  background: var(--cyan-tint);
  border-color: var(--cyan-dark);
  transform: translateX(4px);
}

.mobile-menu-toggle {
  display: none;
}

/* Responsive */
@media (max-width: 1024px) {
  .app-container {
    grid-template-columns: 240px 1fr;
  }
  .app-toc {
    display: none;
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: inline-flex !important;
  }
  .app-container {
    grid-template-columns: 1fr;
  }
  .app-sidebar {
    display: none;
  }
  .app-sidebar.mobile-open {
    display: block;
    position: fixed;
    inset: 64px 0 0 0;
    z-index: 40;
    width: 100%;
    height: calc(100vh - 64px);
    background: var(--bg-app);
    overflow-y: auto;
    box-shadow: var(--shadow-solid-lg);
  }
  .app-main {
    padding: 24px 16px;
  }
  .level-selector-container {
    grid-template-columns: 1fr;
  }
}

/* Copy Deep Link Button */
.copy-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--card-bg);
  color: var(--ink-dark);
  border: var(--border-hard);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 2px 2px 0px var(--border-color);
}

.copy-link-btn:hover {
  background: var(--cyan-neon);
  color: #1A1F26;
  border-color: #1A1F26;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px #1A1F26;
}

.copy-link-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px #1A1F26;
}

/* Sources & Bibliography Styles */
.topic-sources-box {
  margin-top: 36px;
  padding: 24px;
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-solid);
}

.topic-source-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--bg-app);
  border: var(--border-subtle);
  border-left: 4px solid var(--cyan-dark);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.topic-source-item:hover {
  border-left-color: var(--magenta-neon);
  transform: translateX(3px);
}

.source-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.source-item-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--ink-dark);
  line-height: 1.35;
}

.source-item-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted-grey);
}

.source-item-desc {
  font-size: 0.88rem;
  color: var(--ink-dark);
  line-height: 1.45;
}

.source-external-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--magenta-neon);
  text-decoration: none;
  margin-top: 4px;
  transition: color 0.15s ease;
}

.source-external-link:hover {
  color: var(--cyan-dark);
  text-decoration: underline;
}

/* Global Sources Directory Grid */
.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.source-card {
  background: var(--card-bg);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-solid);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.source-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-solid-lg);
}

.source-card-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 3px 8px;
  background: var(--cyan-tint);
  color: var(--ink-dark);
  border: 1px solid var(--cyan-dark);
  border-radius: 4px;
  margin-bottom: 10px;
}