/* ========================================
   Product Skills Guide - Terminal Aesthetic
   Matching main site style with Anthropic composition
   ======================================== */

/* ========================================
   CSS Custom Properties
   ======================================== */

:root {
  /* Colors - Dark terminal palette (default) */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-card: #0d0d0d;

  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  --accent-primary: #22c55e;
  --accent-secondary: #3b82f6;
  --accent-tertiary: #a855f7;
  --accent-warning: #eab308;
  --accent-danger: #ef4444;

  --border-color: #27272a;
  --border-light: #3f3f46;

  /* Topic Colors */
  --color-strategy: #f59e0b;
  --color-gtm: #3b82f6;
  --color-execution: #ec4899;
  --color-visual: #a855f7;

  /* Typography */
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Effects */
  --glow-green: 0 0 20px rgba(34, 197, 94, 0.3);
  --glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f4f4f5;
  --bg-tertiary: #e4e4e7;
  --bg-card: #fafafa;

  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #71717a;

  --accent-primary: #16a34a;
  --accent-secondary: #2563eb;
  --accent-tertiary: #9333ea;
  --accent-warning: #ca8a04;
  --accent-danger: #dc2626;

  --border-color: #e4e4e7;
  --border-light: #d4d4d8;

  --glow-green: 0 0 20px rgba(22, 163, 74, 0.2);
  --glow-blue: 0 0 20px rgba(37, 99, 235, 0.2);
}

/* ========================================
   Reset & Base
   ======================================== */

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

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

body {
  font-family: var(--font-mono);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

/* Scanline effect */
.scanline {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.15),
    rgba(0, 0, 0, 0.15) 1px,
    transparent 1px,
    transparent 2px
  );
  pointer-events: none;
  z-index: 1000;
  opacity: 0.3;
}

/* Noise texture */
.noise {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 999;
  opacity: 0.02;
}

[data-theme="light"] .scanline,
[data-theme="light"] .noise {
  opacity: 0;
}

::selection {
  background: var(--accent-primary);
  color: var(--bg-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ========================================
   Navigation
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-xl);
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
}

[data-theme="light"] .nav {
  background: rgba(255, 255, 255, 0.9);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.nav__logo a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.nav__logo a:hover {
  color: var(--accent-primary);
}

.nav__prompt {
  color: var(--accent-primary);
  font-weight: 600;
}

.nav__separator {
  color: var(--text-muted);
}

.nav__current {
  color: var(--text-secondary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::before {
  content: './';
  color: var(--text-muted);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.nav__link:hover {
  color: var(--accent-primary);
}

.nav__link:hover::before {
  opacity: 1;
}

/* Theme Switch */
.theme-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 28px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.theme-switch:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.theme-switch__icon--light {
  display: none;
}

.theme-switch__icon--dark {
  display: block;
}

[data-theme="light"] .theme-switch__icon--light {
  display: block;
}

[data-theme="light"] .theme-switch__icon--dark {
  display: none;
}

/* Burger Menu */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 102;
}

.burger__line {
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
  transform-origin: center;
}

.burger.active .burger__line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.burger.active .burger__line:nth-child(2) {
  opacity: 0;
}

.burger.active .burger__line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.nav__mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.nav__mobile-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* ========================================
   Main Layout
   ======================================== */

.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: calc(80px + var(--space-3xl)) var(--space-xl) var(--space-2xl);
}

/* ========================================
   Hero Section - Anthropic Style
   ======================================== */

.hero {
  text-align: center;
  margin-bottom: var(--space-4xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-primary);
  margin-bottom: var(--space-xl);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  50% { opacity: 0.8; box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
}

.hero__title {
  margin-bottom: var(--space-lg);
}

.hero__title-line {
  display: block;
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero__title-accent {
  color: var(--accent-primary);
}

.hero__subtitle {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

.hero__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero__meta-sep {
  color: var(--border-light);
}

.accent {
  color: var(--accent-primary);
  font-weight: 500;
}

/* ========================================
   Stats Section
   ======================================== */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-3xl);
}

.stat {
  text-align: center;
}

.stat__value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-primary);
  line-height: 1;
}

.stat__label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   Terminal Block
   ======================================== */

.terminal-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.terminal-block__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.terminal-block__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-block__dot--red { background: var(--accent-danger); }
.terminal-block__dot--yellow { background: var(--accent-warning); }
.terminal-block__dot--green { background: var(--accent-primary); }

.terminal-block__title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: var(--space-sm);
}

.terminal-block__content {
  padding: var(--space-lg);
}

.terminal-block__content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Intro Section */
.intro {
  margin-bottom: var(--space-3xl);
}

/* ========================================
   Section Styles
   ======================================== */

.section {
  margin-bottom: var(--space-4xl);
}

.section__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.terminal__prompt {
  color: var(--accent-primary);
  font-weight: 600;
}

.section__title {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-primary);
}

.section__count {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border-radius: 4px;
}

/* ========================================
   Topics Grid
   ======================================== */

.topics__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

.topic-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.topic-card--strategy { border-left: 3px solid var(--color-strategy); }
.topic-card--gtm { border-left: 3px solid var(--color-gtm); }
.topic-card--execution { border-left: 3px solid var(--color-execution); }
.topic-card--visual { border-left: 3px solid var(--color-visual); }

.topic-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.topic-card__icon {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.topic-card--strategy .topic-card__icon { color: var(--color-strategy); }
.topic-card--gtm .topic-card__icon { color: var(--color-gtm); }
.topic-card--execution .topic-card__icon { color: var(--color-execution); }
.topic-card--visual .topic-card__icon { color: var(--color-visual); }

.topic-card__tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 3px;
  background: rgba(34, 197, 94, 0.1);
  color: var(--accent-primary);
}

.topic-card--strategy .topic-card__tag { background: rgba(245, 158, 11, 0.1); color: var(--color-strategy); }
.topic-card--gtm .topic-card__tag { background: rgba(59, 130, 246, 0.1); color: var(--color-gtm); }
.topic-card--execution .topic-card__tag { background: rgba(236, 72, 153, 0.1); color: var(--color-execution); }
.topic-card--visual .topic-card__tag { background: rgba(168, 85, 247, 0.1); color: var(--color-visual); }

.topic-card__time {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.topic-card__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  font-family: var(--font-sans);
}

.topic-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.topic-card__details {
  margin: var(--space-md) 0;
  padding-left: var(--space-lg);
  display: grid;
  gap: var(--space-xs);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.topic-card__details li {
  list-style: disc;
}

.topic-card__frameworks {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

/* ========================================
   Topic Narratives
   ======================================== */

.topic-narratives {
  display: grid;
  gap: var(--space-xl);
}

.topics-intro {
  margin-bottom: var(--space-2xl);
}

.topics-intro__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-sans);
  margin-bottom: var(--space-sm);
}

.topics-intro__subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.topics-intro__infographic {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-sm);
}

.topic-narrative {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: var(--space-xl);
}

.topic-narrative--strategy { border-left: 3px solid var(--color-strategy); }
.topic-narrative--gtm { border-left: 3px solid var(--color-gtm); }
.topic-narrative--execution { border-left: 3px solid var(--color-execution); }
.topic-narrative--visual { border-left: 3px solid var(--color-visual); }

.topic-narrative__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-sans);
  margin-bottom: var(--space-xs);
}

.topic-narrative__subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.topic-narrative__infographic {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.infographic-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.infographic-card__label {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.infographic-card__value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.infographic-card__note {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.topic-narrative--strategy .infographic-card__value { color: var(--color-strategy); }
.topic-narrative--gtm .infographic-card__value { color: var(--color-gtm); }
.topic-narrative--execution .infographic-card__value { color: var(--color-execution); }
.topic-narrative--visual .infographic-card__value { color: var(--color-visual); }

.infographic-card--strategy .infographic-card__value { color: var(--color-strategy); }
.infographic-card--gtm .infographic-card__value { color: var(--color-gtm); }
.infographic-card--execution .infographic-card__value { color: var(--color-execution); }
.infographic-card--visual .infographic-card__value { color: var(--color-visual); }

.topic-narrative__body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.topic-narrative__body p:last-child {
  margin-bottom: 0;
}

.topic-cite {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: var(--space-xs);
}

.topic-cite__icon {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-muted);
  font-size: 0.65rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.topic-cite__icon:hover,
.topic-cite__icon:focus-visible {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  outline: none;
}

.topic-cite__tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: normal;
  display: flex;
  gap: 0;
  align-items: flex-start;
  width: 560px;
  max-width: 560px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 10;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.topic-cite__logo {
  display: none;
}

.topic-cite__logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.topic-cite__meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topic-cite__company {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.topic-cite__link {
  color: var(--accent-primary);
  text-decoration: none;
  line-height: 1.4;
  display: inline;
}

.topic-cite:hover .topic-cite__tooltip,
.topic-cite:focus-within .topic-cite__tooltip {
  opacity: 1;
  pointer-events: auto;
}

.topic-narrative__divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--space-lg) 0 var(--space-sm);
}

.topic-narrative__authors {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========================================
   Topic Overview
   ======================================== */

.topic-overview__item {
  padding-bottom: var(--space-lg);
  margin-bottom: var(--space-lg);
  border-bottom: 1px dashed var(--border-color);
}

.topic-overview__item:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: none;
}

.topic-overview__title {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  font-family: var(--font-sans);
}

.topic-overview__label {
  font-weight: 600;
  color: var(--text-primary);
  margin-right: var(--space-xs);
}

.topic-overview__item--strategy .topic-overview__label { color: var(--color-strategy); }
.topic-overview__item--gtm .topic-overview__label { color: var(--color-gtm); }
.topic-overview__item--execution .topic-overview__label { color: var(--color-execution); }
.topic-overview__item--visual .topic-overview__label { color: var(--color-visual); }

.topic-overview__list {
  padding-left: var(--space-lg);
  display: grid;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.topic-overview__list li {
  list-style: disc;
}

/* ========================================
   Research Summary Blocks
   ======================================== */

.research-summary {
  margin-bottom: var(--space-3xl);
}

.research-summary__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  font-family: var(--font-sans);
}

.research-summary__lead {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.research-summary__list {
  padding-left: var(--space-lg);
  display: grid;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.research-summary__list li {
  list-style: disc;
}

.evidence-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.evidence-table th,
.evidence-table td {
  border: 1px solid var(--border-color);
  padding: var(--space-sm);
  vertical-align: top;
}

.evidence-table th {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  text-align: left;
}

.evidence-table__topic {
  font-weight: 600;
  color: var(--text-primary);
}

.tag {
  font-size: 0.7rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border-radius: 3px;
  color: var(--text-secondary);
}

/* ========================================
   Episodes List
   ======================================== */

.episodes__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.episode-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--space-lg);
  transition: all var(--transition-normal);
}

.episode-card:hover {
  border-color: var(--accent-primary);
}

.episode-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.episode-card__company {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
}

.episode-card__tag {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.episode-card__tag--strategy { background: rgba(245, 158, 11, 0.1); color: var(--color-strategy); }
.episode-card__tag--gtm { background: rgba(59, 130, 246, 0.1); color: var(--color-gtm); }
.episode-card__tag--execution { background: rgba(236, 72, 153, 0.1); color: var(--color-execution); }

.episode-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  font-family: var(--font-sans);
  line-height: 1.3;
}

.episode-card__guest {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.episode-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.episode-card__insights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
}

.insight {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.insight__label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.insight__value {
  font-size: 0.8rem;
  color: var(--accent-primary);
  font-weight: 500;
}

/* ========================================
   Skills Graph
   ======================================== */

.skills-graph__controls {
  margin-bottom: var(--space-lg);
}

.skills-graph__filter {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.skills-graph__filter label {
  white-space: nowrap;
}

.skills-graph__filter input[type="range"] {
  width: 200px;
  accent-color: var(--accent-primary);
}

.skills-graph__value {
  font-weight: 600;
  color: var(--accent-primary);
  min-width: 32px;
}

.skills-graph__wrapper {
  margin-bottom: var(--space-lg);
}

.skills-graph__canvas {
  padding: var(--space-lg);
  min-height: 500px;
  touch-action: pan-y;
}

.skills-graph__canvas svg {
  width: 100%;
  height: 100%;
  min-height: 500px;
  touch-action: pan-y;
}

.skills-graph__tooltip {
  position: fixed;
  display: none;
  max-width: 300px;
  padding: var(--space-md);
  border-radius: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-primary);
  pointer-events: none;
  touch-action: manipulation;
  z-index: 200;
}

.skills-graph__tooltip.is-visible {
  display: block;
}

@media (hover: none) {
  .skills-graph__tooltip {
    pointer-events: auto;
  }
}

.skills-graph__legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Filter Buttons */
.skills-graph__filter-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
  touch-action: manipulation;
  transition: all var(--transition-fast);
}

.skills-graph__filter-btn:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.skills-graph__filter-btn.is-active {
  background: var(--bg-tertiary);
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.skills-graph__legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.skills-graph__legend-dot--hard { background: #22c55e; }
.skills-graph__legend-dot--soft { background: #a855f7; }
.skills-graph__legend-dot--emerging { background: #f59e0b; }

/* Bubble styles */
.skills-graph__bubble {
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.skills-graph__bubble circle {
  stroke: rgba(255, 255, 255, 0.3);
  stroke-width: 2;
  transition: stroke-width 0.2s ease, filter 0.2s ease;
}

.skills-graph__bubble:hover {
  transform: scale(1.05);
}

.skills-graph__bubble:hover circle {
  stroke-width: 3;
  filter: drop-shadow(0 0 12px currentColor);
}

.skills-graph__bubble--active circle {
  stroke-width: 4;
  stroke: rgba(255, 255, 255, 0.5);
  filter: drop-shadow(0 0 20px currentColor);
}

.skills-graph--has-active .skills-graph__bubble:not(.skills-graph__bubble--active) {
  opacity: 0.35;
}

.skills-graph__bubble-text {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  fill: white;
  pointer-events: none;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.skills-graph__bubble-count {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  fill: rgba(255, 255, 255, 0.9);
  pointer-events: none;
}

/* Detail Panel */
.skills-graph__detail-panel {
  position: fixed;
  top: 16px;
  right: 16px;
  bottom: 16px;
  width: 380px;
  max-width: calc(100vw - 40px);
  max-height: calc(100vh - 32px);
  max-height: calc(100dvh - 32px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--space-lg);
  overflow-y: auto;
  transform: translateX(calc(100% + 40px));
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 1000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.skills-graph__detail-panel.is-visible {
  transform: translateX(0);
  opacity: 1;
}

.skills-graph__detail-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-tertiary);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.skills-graph__detail-close:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.skills-graph__detail-header {
  margin-bottom: var(--space-lg);
  padding-right: var(--space-2xl);
}

.skills-graph__detail-category {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 3px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.skills-graph__detail-category--hard { background: rgba(34, 197, 94, 0.1); color: #22c55e; }
.skills-graph__detail-category--soft { background: rgba(168, 85, 247, 0.1); color: #a855f7; }
.skills-graph__detail-category--emerging { background: rgba(245, 158, 11, 0.1); color: #f59e0b; }

.skills-graph__detail-title {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-xs) 0;
  line-height: 1.3;
}

.skills-graph__detail-count {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.skills-graph__detail-count strong {
  color: var(--accent-primary);
  font-size: 1rem;
}

.skills-graph__detail-description {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ========================================
   Frameworks Grid
   ======================================== */

.frameworks__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.framework-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--space-lg);
  transition: border-color var(--transition-normal);
}

.framework-box:hover {
  border-color: var(--accent-primary);
}

.framework-box__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-color);
}

.framework-box__number {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-primary);
  padding: var(--space-xs) var(--space-sm);
  background: rgba(34, 197, 94, 0.1);
  border-radius: 4px;
}

.framework-box__title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.framework-box__source {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.framework-box__content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.framework-box__viz {
  margin-top: var(--space-md);
  padding: var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.framework-box__viz svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: var(--font-mono);
}

.framework-box__content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.framework-box__legend {
  margin-top: var(--space-xs);
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.framework-box__content li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding-left: var(--space-md);
  position: relative;
}

.framework-box__content li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--text-muted);
  font-size: 0.7rem;
}

/* ========================================
   Anti-patterns
   ======================================== */

.antipatterns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.antipattern {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: rgba(234, 179, 8, 0.05);
  border: 1px solid rgba(234, 179, 8, 0.2);
  border-radius: 8px;
}

.antipattern__icon {
  font-size: 1.25rem;
  color: var(--accent-warning);
  flex-shrink: 0;
}

.antipattern__content h4 {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.antipattern__content p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ========================================
   About Section
   ======================================== */

.about__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.about__item {
  display: flex;
  gap: var(--space-sm);
  font-size: 0.85rem;
}

.about__label {
  color: var(--text-muted);
}

.about__item a {
  color: var(--accent-primary);
  transition: opacity var(--transition-fast);
}

.about__item a:hover {
  opacity: 0.8;
}

/* ========================================
   Footer
   ======================================== */

.footer {
  border-top: 1px solid var(--border-color);
  padding: var(--space-lg) var(--space-xl);
  margin-top: var(--space-2xl);
}

.footer__content {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer__time {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer__time-label {
  color: var(--text-muted);
}

.footer__time-value {
  color: var(--accent-primary);
  font-weight: 500;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 900px) {
  .topics__grid,
  .episodes__list,
  .frameworks__grid,
  .antipatterns {
    grid-template-columns: 1fr;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .burger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    transition: right var(--transition-normal);
    z-index: 101;
  }

  .nav__links.active {
    right: 0;
  }

  .nav__link {
    font-size: 1.1rem;
  }

  .nav__link::before {
    display: none;
  }

  .nav__mobile-overlay {
    display: block;
  }

  .nav__mobile-overlay.active {
    display: block;
  }

  .hero__title-line {
    font-size: 2rem;
  }

  .hero__meta {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .hero__meta-sep {
    display: none;
  }

  .episode-card__insights {
    grid-template-columns: 1fr;
  }

  .skills-graph__controls {
    margin-bottom: var(--space-md);
  }

  .skills-graph__filter {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }

  .skills-graph__canvas {
    padding: var(--space-sm);
    min-height: 420px;
  }

  .skills-graph__canvas svg {
    min-height: 420px;
  }

  .skills-graph__detail-panel {
    top: auto;
    bottom: env(safe-area-inset-bottom);
    right: 0;
    left: 0;
    width: 100%;
    max-width: 100%;
    max-height: calc(100vh - env(safe-area-inset-top) - env(safe-area-inset-bottom));
    max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom));
    border-radius: 12px 12px 0 0;
    padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
    transform: translateY(100%);
  }

  .skills-graph__detail-panel.is-visible {
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .nav {
    padding: var(--space-sm) var(--space-md);
  }

  .main {
    padding: calc(70px + var(--space-xl)) var(--space-md) var(--space-xl);
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .stat__value {
    font-size: 1.5rem;
  }

  .footer__content {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .topic-cite__tooltip {
    position: fixed;
    left: 50%;
    right: auto;
    top: auto;
    bottom: calc(12px + env(safe-area-inset-bottom));
    transform: translateX(-50%);
    width: min(90vw, 560px);
    max-width: 90vw;
    max-height: 60vh;
    overflow-y: auto;
    z-index: 1001;
  }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .scanline,
  .noise,
  .nav,
  .burger,
  .skills-graph__controls,
  .skills-graph__legend {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .main {
    padding-top: 0;
  }

  .terminal-block,
  .topic-card,
  .episode-card,
  .framework-box,
  .antipattern {
    border-color: #ddd;
    background: white;
    page-break-inside: avoid;
  }
}