/* ============================================
   PRISMA — Design System "The Neon Library"
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors - Foundation */
  --background: #0b1326;
  --surface: #0b1326;
  --surface-dim: #0b1326;
  --surface-container-lowest: #060e20;
  --surface-container-low: #131b2e;
  --surface-container: #171f33;
  --surface-container-high: #222a3d;
  --surface-container-highest: #2d3449;
  --surface-bright: #31394d;
  --surface-variant: #2d3449;

  /* Colors - Accents */
  --primary: #4cd7f6;           /* Cyan Spark */
  --primary-container: #06b6d4;
  --on-primary: #003640;
  --on-primary-container: #00424f;

  --secondary: #d0bcff;         /* Electric Orchid */
  --secondary-container: #571bc1;
  --on-secondary: #3c0091;

  --tertiary: #4edea3;          /* Code Emerald */
  --tertiary-container: #1bbd85;
  --on-tertiary: #003824;

  /* Colors - Text */
  --on-surface: #dae2fd;
  --on-surface-variant: #bcc9cd;
  --on-background: #dae2fd;

  /* Colors - Utility */
  --outline: #869397;
  --outline-variant: #3d494c;
  --error: #ffb4ab;
  --error-container: #93000a;
  --inverse-surface: #dae2fd;
  --inverse-on-surface: #283044;
  --inverse-primary: #00687a;
  --surface-tint: #4cd7f6;

  /* Typography */
  --font-headline: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-label: 'Inter', 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;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-ambient: 0 20px 40px rgba(6, 14, 32, 0.4);
  --shadow-glow-primary: 0 0 20px rgba(76, 215, 246, 0.4);
  --shadow-glow-primary-subtle: 0 0 20px rgba(76, 215, 246, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --max-width: 72rem;
  --header-height: 4rem;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--background);
  color: var(--on-surface);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  overflow-x: hidden;
}

::selection {
  background-color: rgba(6, 182, 212, 0.3);
  color: var(--primary);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* --- Reading Progress Bar --- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  z-index: 1000;
  transition: width 50ms linear;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(11, 19, 38, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(61, 73, 76, 0.15);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  height: var(--header-height);
}

.site-logo {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.03em;
}

/* Desktop Nav */
.nav-desktop {
  display: none;
  gap: var(--space-xl);
  align-items: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--on-surface-variant);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: color var(--transition-normal), background-color var(--transition-normal);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: var(--space-sm);
  right: var(--space-sm);
  height: 2px;
  background-color: var(--primary);
  border-radius: var(--radius-full);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Language Switcher - Glass Pill */
.lang-switcher {
  display: flex;
  align-items: center;
  background-color: rgba(34, 42, 61, 0.6);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-full);
  padding: 2px;
  border: 1px solid rgba(61, 73, 76, 0.2);
}

.lang-btn {
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background-color: var(--surface-bright);
  color: var(--primary);
}

.lang-btn:hover:not(.active) {
  color: var(--on-surface);
}

/* Icon Button */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
  transition: all var(--transition-normal);
}

.icon-btn:hover {
  color: var(--primary);
  background-color: var(--surface-container-high);
}

/* Hamburger Menu */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  cursor: pointer;
  z-index: 200;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--on-surface-variant);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav Overlay */
.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(11, 19, 38, 0.95);
  backdrop-filter: blur(20px);
  z-index: 150;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile .nav-link {
  font-family: var(--font-headline);
  font-size: 2rem;
  font-weight: 600;
}

/* --- Main Content --- */
.site-main {
  flex-grow: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background-color: var(--surface-container-low);
  padding: var(--space-3xl) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
  isolation: isolate;
  margin-bottom: var(--space-3xl);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.2;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 70% 30%, var(--primary) 0%, transparent 40%),
    radial-gradient(circle at 20% 80%, var(--secondary) 0%, transparent 40%);
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.hero-formats {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero-title {
  font-family: var(--font-headline);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--on-surface);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-summary {
  font-size: 1rem;
  color: var(--on-surface-variant);
  line-height: 1.7;
  max-width: 48rem;
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  font-family: var(--font-label);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid;
  transition: all var(--transition-normal);
}

.tag--primary {
  color: var(--primary);
  border-color: rgba(76, 215, 246, 0.2);
  background-color: rgba(76, 215, 246, 0.05);
}

.tag--secondary {
  color: var(--secondary);
  border-color: rgba(208, 188, 255, 0.2);
  background-color: rgba(208, 188, 255, 0.05);
}

.tag--tertiary {
  color: var(--tertiary);
  border-color: rgba(78, 222, 163, 0.2);
  background-color: rgba(78, 222, 163, 0.05);
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow-primary);
  transform: translateY(-1px);
}

/* Format Card (in hero) */
.format-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  background-color: rgba(11, 19, 38, 0.6);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(61, 73, 76, 0.3);
  transition: all var(--transition-normal);
  cursor: pointer;
  flex: 1;
  min-width: 200px;
}

.format-card:hover {
  border-color: rgba(76, 215, 246, 0.5);
  box-shadow: var(--shadow-glow-primary-subtle);
}

.format-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-lg);
  background-color: rgba(76, 215, 246, 0.1);
  color: var(--primary);
  font-size: 1.75rem;
  transition: background-color var(--transition-normal);
}

.format-card:hover .format-card__icon {
  background-color: rgba(76, 215, 246, 0.2);
}

.format-card__title {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--on-surface);
}

.format-card__subtitle {
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.format-card__arrow {
  margin-left: auto;
  color: var(--primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.format-card:hover .format-card__arrow {
  opacity: 1;
}

/* Format card disabled state */
.format-card--disabled {
  opacity: 0.4;
  pointer-events: none;
}

.format-card--disabled .format-card__icon {
  background-color: rgba(134, 147, 151, 0.1);
  color: var(--outline);
}

/* --- Chronological Log --- */
.chrono-log {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: 64rem;
}

.section-title {
  font-family: var(--font-headline);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--on-surface);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--surface-container-high);
}

.section-title .material-symbols-outlined {
  color: var(--primary);
}

/* Article Entry */
.article-entry {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-lg);
  margin-left: calc(-1 * var(--space-lg));
  margin-right: calc(-1 * var(--space-lg));
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.article-entry:hover {
  background-color: var(--surface-container-low);
  border-color: rgba(61, 73, 76, 0.15);
}

.article-entry__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.article-entry__date {
  font-family: var(--font-headline);
  font-size: 1rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  transition: color var(--transition-normal);
}

.article-entry:hover .article-entry__date {
  color: var(--primary);
}

.article-entry__reading-time {
  font-family: var(--font-label);
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.article-entry__reading-time .material-symbols-outlined {
  font-size: 1rem;
}

.article-entry__title {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--on-surface);
  transition: color var(--transition-normal);
  line-height: 1.3;
}

.article-entry:hover .article-entry__title {
  color: var(--primary);
}

.article-entry__summary {
  font-family: var(--font-body);
  color: var(--on-surface-variant);
  line-height: 1.7;
}

/* Format Indicators */
.format-indicators {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px dashed var(--surface-container);
}

.format-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--transition-normal);
}

.format-indicator--active {
  color: var(--on-surface-variant);
}

.format-indicator--active:hover {
  color: var(--secondary);
}

.format-indicator--inactive {
  color: rgba(134, 147, 151, 0.4);
}

.format-indicator .material-symbols-outlined {
  font-size: 1.125rem;
}

/* Accent Bar on featured cards */
.article-entry--featured {
  border-left: 4px solid var(--primary);
  padding-left: calc(var(--space-lg) - 4px);
}

/* --- Footer --- */
.site-footer {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) var(--space-lg);
  background-color: var(--surface-container-lowest);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  align-items: center;
  text-align: center;
}

.footer-logo {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--on-surface);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-lg);
}

.footer-link {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: var(--primary);
}

.footer-copyright {
  font-family: var(--font-label);
  font-size: 0.8125rem;
  color: var(--outline);
}

/* --- Utility Classes --- */
.glass-panel {
  background-color: rgba(11, 19, 38, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.text-glow {
  text-shadow: 0 0 10px rgba(76, 215, 246, 0.5);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Material Symbols config */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* --- Page Transitions --- */
.page-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Responsive --- */
@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }

  .hamburger {
    display: none;
  }

  .hero {
    padding: var(--space-3xl);
  }

  .hero-formats {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .article-entry {
    flex-direction: row;
    gap: var(--space-xl);
    align-items: flex-start;
  }

  .article-entry__meta {
    width: 12rem;
    flex-shrink: 0;
    padding-right: var(--space-lg);
    border-right: 2px solid var(--surface-container-high);
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

}

@media (min-width: 1024px) {
  .site-main {
    padding: var(--space-3xl) var(--space-lg);
  }

  .hero {
    padding: var(--space-3xl) 4rem;
  }

}

/* ===========================================
   ARTICLE DETAIL PAGE
   =========================================== */

/* Layout */
.article-detail {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.article-detail__main {
  flex: 1;
  min-width: 0;
}

.article-detail__sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Article Header */
.article-header {
  margin-bottom: var(--space-2xl);
}

.article-header__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  color: var(--on-surface-variant);
  font-family: var(--font-label);
  font-size: 0.875rem;
}

.article-header__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.article-header__meta-item .material-symbols-outlined {
  font-size: 1.125rem;
}

.article-header__title {
  font-family: var(--font-headline);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--on-surface);
  margin-bottom: var(--space-lg);
}

/* Prose — Rendered Markdown Content */
.prose {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--on-surface-variant);
}

.prose h2 {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.prose h3 {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--on-surface);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

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

.prose strong {
  color: var(--on-surface);
  font-weight: 600;
}

.prose em {
  color: var(--primary);
  font-style: italic;
}

.prose a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: rgba(76, 215, 246, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-normal);
}

.prose a:hover {
  text-decoration-color: var(--primary);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: var(--space-sm);
}

.prose blockquote {
  border-left: 4px solid var(--primary);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  background-color: var(--surface-container-low);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--on-surface);
  font-style: italic;
}

.prose code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875em;
  background-color: var(--surface-container-low);
  color: var(--tertiary);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
}

.prose pre {
  background-color: var(--surface-container-lowest);
  border-top: 3px solid var(--tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--on-surface-variant);
}

/* Sidebar Cards */
.sidebar-card {
  background-color: var(--surface-container);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(61, 73, 76, 0.2);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.sidebar-card:hover {
  border-color: rgba(76, 215, 246, 0.3);
}

.sidebar-card__header {
  padding: var(--space-md) var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-card__label {
  font-family: var(--font-label);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  background-color: rgba(76, 215, 246, 0.1);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
}

.sidebar-card__label--secondary {
  color: var(--secondary);
  background-color: rgba(208, 188, 255, 0.1);
}

.sidebar-card__label--tertiary {
  color: var(--tertiary);
  background-color: rgba(78, 222, 163, 0.1);
}

.sidebar-card__icon {
  color: var(--on-surface-variant);
}

.sidebar-card__body {
  padding: 0 var(--space-lg) var(--space-lg);
}

.sidebar-card__title {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-xs);
}

.sidebar-card__subtitle {
  font-family: var(--font-label);
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  margin-bottom: var(--space-md);
}

.sidebar-card__description {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
  text-align: center;
  margin-bottom: var(--space-md);
}

/* Spotify Embed Container */
.spotify-embed {
  padding: 0 var(--space-lg) var(--space-lg);
}

.spotify-embed iframe {
  border-radius: var(--radius-lg);
}

/* Infographic preview */
.infographic-preview {
  padding: 0 var(--space-lg);
  margin-bottom: var(--space-md);
  cursor: pointer;
}

.infographic-preview img {
  border-radius: var(--radius-md);
  opacity: 0.7;
  transition: opacity var(--transition-normal);
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.infographic-preview:hover img {
  opacity: 1;
}

.infographic-expand-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  width: 100%;
  padding: var(--space-sm);
  font-family: var(--font-label);
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  background-color: var(--surface-container-high);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  margin: 0 var(--space-lg) var(--space-lg);
}

.infographic-expand-btn:hover {
  color: var(--primary);
  background-color: var(--surface-container-highest);
}

.infographic-expand-btn .material-symbols-outlined {
  font-size: 1.125rem;
}

/* PDF card */
.pdf-card__icon-large {
  display: flex;
  justify-content: center;
  padding: var(--space-lg) 0 var(--space-md);
}

.pdf-card__icon-large .material-symbols-outlined {
  font-size: 3rem;
  color: var(--primary);
  opacity: 0.6;
}

.pdf-card__title {
  font-family: var(--font-headline);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--on-surface);
  text-align: center;
  margin-bottom: var(--space-xs);
}

.btn-download {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: 0.75rem var(--space-lg);
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.03em;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
}

.btn-download:hover {
  box-shadow: var(--shadow-glow-primary);
  transform: translateY(-1px);
}

.btn-web-version {
  display: block;
  text-align: center;
  font-family: var(--font-label);
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  padding: var(--space-sm) 0;
  transition: color var(--transition-normal);
}

.btn-web-version:hover {
  color: var(--primary);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  background-color: rgba(6, 14, 32, 0.92);
  backdrop-filter: blur(8px);
  justify-content: center;
  align-items: center;
  padding: var(--space-xl);
  cursor: zoom-out;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-width: 95%;
  max-height: 90vh;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-ambient);
}

.lightbox__close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  color: var(--on-surface);
  font-size: 2rem;
  cursor: pointer;
  transition: color var(--transition-normal);
  background: none;
  border: none;
}

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

/* Share Buttons */
.share-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding-top: var(--space-2xl);
  margin-top: var(--space-2xl);
  border-top: 1px solid var(--surface-container-high);
}

.share-bar__label {
  font-family: var(--font-label);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  background-color: var(--surface-container-high);
  color: var(--on-surface-variant);
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 700;
}

.share-btn:hover {
  background-color: var(--primary);
  color: var(--on-primary);
  transform: translateY(-2px);
}

/* Related Articles */
.related-articles {
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--surface-container-high);
}

.related-articles__title {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-xl);
}

.related-articles__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .related-articles__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.related-card {
  background-color: var(--surface-container-low);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.related-card:hover {
  border-color: rgba(61, 73, 76, 0.2);
  background-color: var(--surface-container);
}

.related-card__title {
  font-family: var(--font-headline);
  font-size: 1rem;
  font-weight: 600;
  color: var(--on-surface);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
  transition: color var(--transition-normal);
}

.related-card:hover .related-card__title {
  color: var(--primary);
}

.related-card__summary {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Article Detail Responsive */
@media (min-width: 768px) {
  .article-detail {
    flex-direction: row;
  }

  .article-detail__sidebar {
    width: 20rem;
    flex-shrink: 0;
    align-self: flex-start;
  }
}

@media (min-width: 1024px) {
  .article-detail__sidebar {
    width: 22rem;
  }
}

/* ===========================================
   TOPICS PAGE & SEARCH
   =========================================== */

/* Header Search Container */
.search-container {
  display: flex;
  align-items: center;
  position: relative;
  height: 100%;
}

.search-input {
  width: 0;
  opacity: 0;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--on-surface);
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: all var(--transition-normal);
  visibility: hidden;
}

.search-container.active .search-input {
  width: 12rem;
  opacity: 1;
  visibility: visible;
  padding: var(--space-xs) var(--space-sm);
  margin-left: var(--space-sm);
  background: var(--surface-container-high);
  border-radius: var(--radius-sm);
  outline: 1px solid var(--primary);
}

.search-input:focus {
  outline: 2px solid var(--primary);
}

/* Topics Header */
.topics-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
  padding: var(--space-xl) 0;
}

.topics-title {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-md);
}

.topics-subtitle {
  color: var(--on-surface-variant);
  font-size: 1.125rem;
  max-width: 40rem;
  margin: 0 auto var(--space-xl);
}

/* Filter Tags */
.topics-filter-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.filter-tag {
  background: transparent;
  border: 1px solid var(--outline-variant);
  color: var(--on-surface-variant);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-family: var(--font-label);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tag:hover {
  border-color: var(--outline);
  color: var(--on-surface);
  background: var(--surface-container);
}

.filter-tag.active {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

/* Topics Logic Toggle */
.topics-logic-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  font-family: var(--font-label);
  font-size: 0.875rem;
}

.logic-label {
  color: var(--on-surface-variant);
  transition: color var(--transition-fast);
}

.logic-label.active {
  color: var(--primary);
  font-weight: 600;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--surface-container-high);
  transition: var(--transition-normal);
  border-radius: 24px;
  border: 1px solid var(--outline-variant);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: var(--on-surface);
  transition: var(--transition-normal);
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--primary-container);
  border-color: var(--primary);
}

.toggle-switch input:focus + .toggle-slider {
  box-shadow: 0 0 1px var(--primary);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(20px);
  background-color: var(--on-primary-container);
}

/* Topics Results */
.topics-results {
  max-width: 48rem;
  margin: 0 auto;
}

.topics-results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--surface-container-high);
}

.topics-results-count {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  font-weight: 500;
}

/* ==========================================
   INTERACTIVE DASHBOARD LAYOUT
   ========================================== */

.interactive-layout {
  display: flex;
  width: 100%;
  overflow: hidden;
  background-color: var(--surface);
}

.interactive-sidebar {
  display: none;
  width: 280px;
  background-color: var(--surface-container-low);
  border-right: 1px solid var(--outline-variant);
  flex-direction: column;
  z-index: 10;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .interactive-sidebar {
    display: flex;
  }
}

.interactive-sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--surface-container-high);
}

.interactive-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--on-surface);
  margin-bottom: var(--space-xs);
}

.interactive-subtitle {
  font-size: var(--text-xs);
  color: var(--on-surface-variant);
}

.interactive-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) 0;
}

.interactive-nav::-webkit-scrollbar { width: 6px; }
.interactive-nav::-webkit-scrollbar-track { background: transparent; }
.interactive-nav::-webkit-scrollbar-thumb { background-color: var(--outline-variant); border-radius: 10px; }

.interactive-nav-item {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  color: var(--on-surface-variant);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-right: 4px solid transparent;
}

.interactive-nav-item:hover {
  background-color: var(--surface-container);
  color: var(--on-surface);
}

.interactive-nav-item.active {
  background-color: var(--surface-container-high);
  color: var(--primary);
  border-right-color: var(--primary);
  font-weight: 600;
}

.interactive-sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--surface-container-high);
}

.interactive-back-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--on-surface-variant);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.interactive-back-btn:hover {
  color: var(--primary);
}

.interactive-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--surface);
}

.interactive-mobile-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background-color: var(--surface-container-low);
  border-bottom: 1px solid var(--surface-container-high);
}

@media (min-width: 768px) {
  .interactive-mobile-header {
    display: none;
  }
}

.interactive-mobile-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--on-surface);
}

.interactive-mobile-select {
  background-color: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  color: var(--on-surface);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  padding: var(--space-xs) var(--space-sm);
  outline: none;
}

.interactive-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
}

.interactive-content::-webkit-scrollbar { width: 6px; }
.interactive-content::-webkit-scrollbar-track { background: transparent; }
.interactive-content::-webkit-scrollbar-thumb { background-color: var(--outline-variant); border-radius: 10px; }

@media (min-width: 768px) {
  .interactive-content {
    padding: var(--space-2xl);
  }
}

.content-section {
  display: none;
  animation: fadeIn 0.4s ease-in-out;
  max-width: 900px;
  margin: 0 auto;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Interactive Format Content Styles */

.interactive-badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--surface-container-highest);
  color: var(--on-surface);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.badge-primary { color: var(--primary); }
.badge-secondary { color: var(--secondary); }
.badge-tertiary { color: var(--tertiary); }

.interactive-h2 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.interactive-h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-sm);
}

.interactive-p {
  font-size: var(--text-lg);
  color: var(--on-surface-variant);
  line-height: 1.6;
}

.interactive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}
@media (min-width: 768px) {
  .interactive-grid { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.interactive-card {
  background-color: var(--surface-container-low);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.card-accent-primary { border-left: 4px solid var(--primary); }
.card-accent-secondary { border-left: 4px solid var(--secondary); }
.card-accent-tertiary { border-left: 4px solid var(--tertiary); }

.interactive-box {
  background-color: var(--surface-container);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--surface-container-high);
}

.box-error { border-color: var(--error); background-color: rgba(255, 180, 171, 0.05); }
.box-warning { border-color: var(--tertiary); background-color: rgba(78, 222, 163, 0.05); }

.interactive-list {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
}
.interactive-list li {
  color: var(--on-surface-variant);
  margin-bottom: var(--space-xs);
  font-size: var(--text-sm);
}

.chart-container {
  position: relative;
  width: 100%;
  height: 350px;
}

.interactive-table {
  width: 100%;
  text-align: left;
  border-collapse: collapse;
}
.interactive-table th {
  background-color: var(--surface-container-high);
  color: var(--on-surface);
  padding: var(--space-md);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.interactive-table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--surface-container);
  color: var(--on-surface-variant);
}
.text-error { color: var(--error) !important; font-weight: 600; }

.interactive-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}
.interactive-checklist li {
  padding: var(--space-md);
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  cursor: pointer;
  border-bottom: 1px solid var(--surface-container);
  transition: background-color var(--transition-fast);
}
.interactive-checklist li:hover {
  background-color: var(--surface-container-high);
}
.interactive-checklist li.checked {
  background-color: rgba(76, 215, 246, 0.05); /* Primary tint */
}
.interactive-checklist input {
  margin-top: 4px;
  cursor: pointer;
}