/* Modern Dark Theme Variables — matches claude-code-mastery */
:root {
  --bg-primary: #09090b;
  --bg-secondary: #18181b;
  --bg-tertiary: #27272a;
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border-color: #27272a;
  --border-hover: #3f3f46;
  --accent-cyan: #22d3ee;
  --accent-purple: #a855f7;
  --accent-blue: #3b82f6;
  --accent-green: #22c55e;
  --accent-amber: #f59e0b;
  --accent-pink: #ec4899;
  --gradient-start: #06b6d4;
  --gradient-end: #8b5cf6;
}

/* Base */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Glassmorphism Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
}

.logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  object-fit: cover;
  border: 2px solid var(--border-color);
  transition: border-color 0.3s ease;
}

.logo:hover {
  border-color: var(--accent-cyan);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-author {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.brand-author a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.brand-author a:hover {
  color: var(--accent-cyan);
}

/* Header Links */
header nav ul:last-child a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.2s ease;
}

header nav ul:last-child a:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Projects Dropdown */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.dropdown-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.dropdown-arrow {
  transition: transform 0.2s ease;
}

.dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 240px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.5rem;
  padding-top: 1rem;
  z-index: 200;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  flex-direction: column;
  margin-top: 0.5rem;
}

.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -0.5rem;
  left: 0;
  right: 0;
  height: 0.5rem;
}

.dropdown:hover .dropdown-menu {
  display: flex;
}

.dropdown-menu a {
  display: flex !important;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem !important;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
  background: transparent !important;
  border: none !important;
}

.dropdown-menu a:hover {
  background: var(--bg-tertiary) !important;
}

.dropdown-item-text {
  display: flex;
  flex-direction: column;
}

.dropdown-item-title {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9rem;
}

.dropdown-item-desc {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 0.15rem;
}

.dropdown-menu a:hover .dropdown-item-title {
  color: var(--accent-cyan);
}

/* Link favicons */
.link-favicon {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  flex-shrink: 0;
}

.dropdown-menu .link-favicon {
  width: 20px;
  height: 20px;
}

/* Nav Icon Button */
.nav-icon {
  display: flex;
  align-items: center;
  padding: 0 !important;
}

.nav-icon img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
  border: 2px solid var(--border-color);
  transition: all 0.2s ease;
}

.nav-icon:hover img {
  border-color: var(--accent-cyan);
  transform: scale(1.05);
}

/* ===================== */
/* Hero Section          */
/* ===================== */
.hero {
  position: relative;
  padding: 10rem 0 5rem;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(6, 182, 212, 0.12) 0%, rgba(139, 92, 246, 0.08) 40%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(6, 182, 212, 0.25);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  background: var(--bg-tertiary);
  transform: translateY(-2px);
}

/* Hero Banner Image */
.hero-banner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.hero-banner img {
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

@media (max-width: 768px) {
  .hero-banner {
    padding: 0 1rem;
  }

  .hero-banner img {
    border-radius: 12px;
  }
}

/* ===================== */
/* Main Layout           */
/* ===================== */
.main-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  padding-top: 2rem;
  padding-bottom: 4rem;
  align-items: start;
}

/* Sidebar */
#sidebar {
  position: sticky;
  top: 6rem;
  max-height: calc(100vh - 8rem);
  overflow-y: auto;
  padding-right: 1.5rem;
}

#sidebar::-webkit-scrollbar {
  width: 4px;
}

#sidebar::-webkit-scrollbar-track {
  background: transparent;
}

#sidebar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.toc-header {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

#toc a {
  display: block;
  padding: 0.4rem 0;
  padding-left: 1rem;
  text-decoration: none;
  color: var(--text-muted);
  border-left: 2px solid transparent;
  font-size: 0.875rem;
  line-height: 1.5;
  transition: all 0.2s ease;
}

#toc a:hover {
  color: var(--text-secondary);
  border-left-color: var(--border-hover);
}

#toc a.active {
  color: var(--accent-cyan);
  border-left-color: var(--accent-cyan);
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.1), transparent);
}

/* ===================== */
/* Content               */
/* ===================== */
#content {
  max-width: 100%;
  overflow-x: hidden;
}

/* Typography */
#content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: 4rem;
  margin-bottom: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-primary);
}

#content section:first-child h2 {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

#content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

#content p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

#content strong {
  color: var(--text-primary);
  font-weight: 600;
}

#content a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s ease;
}

#content a:hover {
  color: var(--accent-purple);
  text-decoration: underline;
}

#content a.btn-primary {
  color: #fff;
}

#content a.btn-primary:hover {
  color: #fff;
  text-decoration: none;
}

#content ul, #content ol {
  color: var(--text-secondary);
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

#content li {
  margin-bottom: 0.5rem;
}

/* Inline Code */
:not(pre) > code {
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
  font-size: 0.875em;
  border: 1px solid var(--border-color);
}

/* Code Blocks */
pre[class*="language-"] {
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin: 1.5rem 0;
  padding: 1.25rem !important;
  font-size: 0.875rem;
  overflow-x: auto;
}

pre[class*="language-"]::-webkit-scrollbar {
  height: 6px;
}

pre[class*="language-"]::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

pre[class*="language-"]::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 3px;
}

pre[class*="language-"] code {
  line-height: 1.6;
}

/* ===================== */
/* Feature Grid          */
/* ===================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.75rem;
  transition: all 0.25s ease;
}

.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1rem 0 0.5rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon-cyan {
  background: rgba(34, 211, 238, 0.12);
  color: var(--accent-cyan);
}

.feature-icon-purple {
  background: rgba(168, 85, 247, 0.12);
  color: var(--accent-purple);
}

.feature-icon-green {
  background: rgba(34, 197, 94, 0.12);
  color: var(--accent-green);
}

.feature-icon-blue {
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-blue);
}

.feature-icon-amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-amber);
}

.feature-icon-pink {
  background: rgba(236, 72, 153, 0.12);
  color: var(--accent-pink);
}

/* ===================== */
/* Steps                 */
/* ===================== */
.step {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.25rem;
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.step-content ol {
  padding-left: 1.25rem;
}

.step-content ol li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* ===================== */
/* Concept Grid          */
/* ===================== */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.concept-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.75rem;
  transition: all 0.25s ease;
}

.concept-card:hover {
  border-color: var(--border-hover);
}

.concept-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.concept-card p {
  font-size: 0.9rem;
  line-height: 1.65;
}

.concept-card ol {
  padding-left: 1.25rem;
  margin-bottom: 0;
}

.concept-card ol li {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.version-tag {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
}

/* ===== Deep Dive Sections ===== */

/* Rules Section */
.deep-dive-rules {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.rule-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.rule-block pre {
  margin: 0.75rem 0 0.5rem;
}

.rule-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.rule-header h3 {
  margin: 0;
  font-size: 1.05rem;
}

.rule-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.5rem;
  padding: 0.2rem 0.6rem;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.rule-block ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.rule-block ul li {
  margin-bottom: 0.25rem;
}

/* Check Before Grid */
.check-before-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 1rem 0 2rem;
}

.check-before-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
}

/* Port Table */
.port-table-wrapper {
  overflow-x: auto;
  margin: 1rem 0;
}

.port-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.port-table th,
.port-table td {
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.port-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.port-table td {
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Hooks Lifecycle */
.hooks-lifecycle {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.hook-stage {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
}

.hook-stage-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.hook-stage-header h3 {
  margin: 0;
  font-size: 1.05rem;
}

.hook-stage-tag {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.hook-pre {
  background: rgba(34, 211, 238, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(34, 211, 238, 0.3);
}

.hook-post {
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.hook-stop {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.hook-stage pre {
  margin: 0.75rem 0 0;
}

/* Commands Grid */
.commands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.command-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.command-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.command-card h3 code {
  color: var(--accent-cyan);
  background: none;
  padding: 0;
  font-size: 1.1rem;
}

.command-desc {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.command-card ol,
.command-card ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
  font-size: 0.9rem;
}

.command-card li {
  margin-bottom: 0.2rem;
}

/* Skill Detail Block */
.skill-detail-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.skill-detail-block h3 {
  margin: 0 0 0.5rem;
}

.skill-detail-block pre {
  margin: 1rem 0 0;
}

/* Agent Cards */
.agent-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 1.5rem;
}

.agent-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
}

.agent-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.agent-card-header h3 {
  margin: 0;
}

.agent-tools {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'SF Mono', 'Fira Code', monospace;
  background: var(--bg-tertiary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.agent-persona {
  font-style: italic;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent-cyan);
}

.agent-card ol,
.agent-card ul {
  padding-left: 1.25rem;
  font-size: 0.9rem;
}

.agent-card li {
  margin-bottom: 0.2rem;
}

.agent-card pre {
  margin: 1rem 0 0;
}

/* Doc Template Grid */
.doc-template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.doc-template-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.doc-template-card h3 {
  margin: 0 0 0.25rem;
}

.doc-template-location {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.doc-template-card pre {
  margin: 0.75rem 0 0;
}

.doc-template-card ul {
  padding-left: 1.25rem;
  font-size: 0.9rem;
}

/* Testing Grid */
.testing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}

.testing-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.testing-card h3 {
  margin: 0 0 0.25rem;
}

.testing-card pre {
  margin: 0.75rem 0 0;
}

/* Global Config Items */
.global-config-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.global-config-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.global-config-item h4 {
  margin: 0 0 0.5rem;
  color: var(--accent-cyan);
}

/* Responsive adjustments for deep dive sections */
@media (max-width: 768px) {
  .commands-grid,
  .agent-cards,
  .doc-template-grid,
  .testing-grid,
  .global-config-items {
    grid-template-columns: 1fr;
  }

  .rule-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .agent-card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .hook-stage-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

/* Credits Guide Image */
.credits-guide-link {
  display: block;
  margin-bottom: 1.5rem;
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.credits-guide-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(34, 211, 238, 0.15);
}

.credits-guide-image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

/* Version List */
.version-list {
  list-style: none;
  padding-left: 0;
}

.version-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.version-list li:last-child {
  border-bottom: none;
}

.community-credit {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ===================== */
/* RuleCatch Section     */
/* ===================== */
.rulecatch-section {
  background: var(--bg-secondary);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 16px;
  padding: 2.5rem;
  margin-top: 1.5rem;
  position: relative;
  overflow: hidden;
}

.rulecatch-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

.rulecatch-intro {
  margin-bottom: 2rem;
}

.rulecatch-intro p {
  font-size: 1rem;
  line-height: 1.7;
}

.rulecatch-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.rulecatch-feature {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.rulecatch-feature .feature-icon {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 10px;
}

.rulecatch-feature h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.25rem;
}

.rulecatch-feature p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.55;
}

.rulecatch-install {
  margin-bottom: 2rem;
}

.rulecatch-install h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 0.75rem;
}

.rulecatch-npm-links {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.rulecatch-npm-links a {
  color: var(--accent-cyan);
  text-decoration: none;
}

.rulecatch-npm-links a:hover {
  text-decoration: underline;
}

.rulecatch-screenshot {
  margin-bottom: 2rem;
}

.rulecatch-screenshot img {
  width: 100%;
  max-width: 560px;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.rulecatch-screenshot-wide img {
  max-width: 100%;
}

.rulecatch-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  line-height: 1.6;
}

.rulecatch-caption a {
  color: var(--accent-cyan);
  text-decoration: none;
}

.rulecatch-caption a:hover {
  text-decoration: underline;
}

.rulecatch-cta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.rulecatch-trial {
  font-size: 0.85rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .rulecatch-section {
    padding: 1.5rem;
  }

  .rulecatch-features {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .rulecatch-screenshot img {
    max-width: 100%;
  }

  .rulecatch-cta {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ===================== */
/* Footer                */
/* ===================== */
footer {
  margin-top: 4rem;
  padding: 2rem 0;
  text-align: center;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

footer a:hover {
  color: var(--accent-cyan);
}

footer.container {
  margin-top: 4rem;
}

footer .footer-projects {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem !important;
  flex-wrap: wrap;
  padding: 0 1rem;
  margin-top: 1.5rem;
}

.footer-label {
  color: var(--text-muted);
  font-weight: 500;
  margin-right: 0.5rem;
}

.footer-projects a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-secondary);
  transition: all 0.2s ease;
  font-size: 0.875rem;
}

.footer-projects a:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-tertiary);
  color: var(--accent-cyan);
}

/* ===================== */
/* Hamburger Menu Button */
/* ===================== */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  gap: 5px;
  margin-right: 0.75rem;
}

.menu-toggle:hover {
  background: var(--bg-secondary);
  border-color: var(--border-hover);
}

.hamburger-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.menu-toggle.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
  display: block;
  opacity: 1;
}

/* Mobile Menu Drawer */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100vh;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  z-index: 95;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
  padding-top: 5rem;
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-toc {
  padding: 1.5rem;
}

.mobile-toc .toc-header {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.mobile-toc a {
  display: block;
  padding: 0.5rem 0;
  padding-left: 1rem;
  text-decoration: none;
  color: var(--text-muted);
  border-left: 2px solid transparent;
  font-size: 0.875rem;
  line-height: 1.5;
  transition: all 0.2s ease;
}

.mobile-toc a:hover {
  color: var(--text-secondary);
  border-left-color: var(--border-hover);
}

.mobile-toc a.active {
  color: var(--accent-cyan);
  border-left-color: var(--accent-cyan);
}

.mobile-projects {
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  margin-top: 1rem;
}

.mobile-projects a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  margin-top: 0.5rem;
  text-decoration: none;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.mobile-projects a:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

/* ===================== */
/* Responsive            */
/* ===================== */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 240px 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr;
    padding-top: 0;
  }

  #sidebar {
    display: none;
  }

  .container {
    padding: 1rem 1rem;
  }

  /* Hero responsive */
  .hero {
    padding: 7rem 0 3rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  /* Feature grid responsive */
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .concept-grid {
    grid-template-columns: 1fr;
  }

  /* Steps responsive */
  .step {
    flex-direction: column;
    gap: 0.75rem;
  }

  /* Content */
  #content h2 {
    font-size: 1.5rem;
    margin-top: 0;
  }

  .brand-author {
    display: none;
  }

  .brand-logo,
  .dropdown {
    display: none;
  }

  .menu-toggle {
    display: flex;
    flex-shrink: 0;
  }

  header nav ul:first-child {
    flex: 1;
    min-width: 0;
  }

  header nav ul:first-child li {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    width: 100%;
  }

  .brand {
    flex: 1;
    min-width: 0;
    overflow: hidden;
  }

  .brand-text {
    min-width: 0;
  }

  .brand-title {
    font-size: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  header nav ul:last-child {
    gap: 0.5rem;
    flex-shrink: 0;
  }

  header nav ul:last-child a {
    padding: 0.5rem 0.5rem;
    font-size: 0.875rem;
  }

  body.menu-open {
    overflow: hidden;
  }

  footer .footer-projects {
    flex-direction: column;
    gap: 0.5rem;
  }

  .footer-label {
    margin-bottom: 0.5rem;
  }

  .footer-projects a {
    width: 100%;
    justify-content: center;
  }
}

/* Print */
@media print {
  header, #sidebar, footer, .hero {
    display: none !important;
  }

  .main-layout {
    display: block;
    padding-top: 0;
  }

  #content {
    max-width: 100%;
  }

  pre[class*="language-"] {
    white-space: pre-wrap;
    word-break: break-word;
  }
}

/* Accent Colors for Section Dividers */
#content section:nth-of-type(6n+1) h2 { border-top-color: var(--accent-cyan); }
#content section:nth-of-type(6n+2) h2 { border-top-color: var(--accent-purple); }
#content section:nth-of-type(6n+3) h2 { border-top-color: var(--accent-blue); }
#content section:nth-of-type(6n+4) h2 { border-top-color: var(--accent-green); }
#content section:nth-of-type(6n+5) h2 { border-top-color: var(--accent-amber); }
#content section:nth-of-type(6n+6) h2 { border-top-color: var(--accent-pink); }

/* Smooth animations */
* {
  transition-property: color, background-color, border-color;
  transition-duration: 0.15s;
  transition-timing-function: ease;
}

a, button, .logo, .feature-card, .concept-card, .btn {
  transition-duration: 0.2s;
}

/* Learning Path Phases */
.learning-phases {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 1rem 0;
}

.phase {
  flex: 1;
  min-width: 160px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.25rem;
  text-align: center;
}

.phase-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  font-weight: 700;
  font-size: 0.875rem;
  margin-bottom: 0.75rem;
}

.phase h3 {
  font-size: 0.95rem;
  margin: 0 0 0.25rem;
}

.phase-time {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.phase ul {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  text-align: left;
}

.phase ul li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 0.15rem 0;
}

.phase-arrow {
  color: var(--text-muted);
  font-size: 1.25rem;
  padding-top: 2.5rem;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .learning-phases {
    flex-direction: column;
    align-items: stretch;
  }
  .phase-arrow {
    text-align: center;
    padding-top: 0;
    transform: rotate(90deg);
  }
}

/* Troubleshooting Grid */
.troubleshooting-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.troubleshooting-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.25rem;
}

.troubleshooting-item h4 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  color: var(--accent-amber);
}

.troubleshooting-item p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}