/* ─── lichtatlas.de — Stylesheet v2 ─── */
/* Warm, premium, light-themed content site */

/* ─── Custom Properties ───────────────────────────────────────────────────── */

:root {
  /* Brand */
  --amber-50: #FFFBEB;
  --amber-100: #FEF3C7;
  --amber-200: #FDE68A;
  --amber-300: #FCD34D;
  --amber-400: #FBBF24;
  --amber-500: #F59E0B;
  --amber-600: #D97706;
  --amber-700: #B45309;
  --amber-800: #92400E;
  --amber-900: #78350F;

  /* Warm neutrals */
  --gray-50: #FAFAF8;
  --gray-100: #F5F3ED;
  --gray-200: #E8E5DE;
  --gray-300: #D4D0C8;
  --gray-400: #A8A29E;
  --gray-500: #78716C;
  --gray-600: #57534E;
  --gray-700: #44403C;
  --gray-800: #292524;
  --gray-900: #1C1917;

  /* Semantic */
  --bg: #FAFAF8;
  --bg-warm: #FFFCF5;
  --surface: #FFFFFF;
  --text: #1C1917;
  --text-secondary: #57534E;
  --text-muted: #78716C;
  --border: #E8E5DE;
  --accent: #D97706;
  --accent-hover: #B45309;
  --accent-glow: rgba(217, 119, 6, 0.12);
  --accent-glow-strong: rgba(217, 119, 6, 0.2);

  /* Shadows (warm-tinted) */
  --shadow-sm: 0 1px 2px rgba(120, 53, 15, 0.04), 0 1px 3px rgba(120, 53, 15, 0.06);
  --shadow-md: 0 2px 4px rgba(120, 53, 15, 0.04), 0 4px 12px rgba(120, 53, 15, 0.06);
  --shadow-lg: 0 4px 8px rgba(120, 53, 15, 0.04), 0 8px 24px rgba(120, 53, 15, 0.08);
  --shadow-glow: 0 4px 16px rgba(217, 119, 6, 0.12), 0 8px 32px rgba(217, 119, 6, 0.06);

  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Transitions */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --transition-fast: 200ms var(--ease-out-quart);
  --transition-med: 300ms var(--ease-out-quart);
}

/* ─── Reset & Base ────────────────────────────────────────────────────────── */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* Subtle grain overlay */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px;
}

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

a {
  color: var(--accent-hover);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--amber-800);
}

/* ─── Layout ──────────────────────────────────────────────────────────────── */

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ─── Header ──────────────────────────────────────────────────────────────── */

.site-header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo:hover { color: var(--text); }

.logo-icon {
  font-size: 1.5rem;
  color: var(--amber-500);
  filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.4));
}

.main-nav .nav-links {
  display: flex;
  gap: 1.75rem;
  align-items: center;
}

.main-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  padding: 0.25rem 0;
  position: relative;
  transition: color var(--transition-fast);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-med);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--accent-hover);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  transform: scaleX(1);
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ─── Reading Progress Bar ────────────────────────────────────────────────── */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--amber-500), var(--amber-400));
  z-index: 200;
  transition: width 50ms linear;
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
}

/* ─── Hero ────────────────────────────────────────────────────────────────── */

.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

/* Warm radial glow */
.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    rgba(251, 191, 36, 0.15) 0%,
    rgba(245, 158, 11, 0.08) 30%,
    rgba(217, 119, 6, 0.03) 50%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

/* Abstract light rays SVG pattern */
.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='800' height='600' viewBox='0 0 800 600' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3CradialGradient id='glow' cx='50%25' cy='30%25' r='50%25'%3E%3Cstop offset='0%25' stop-color='%23FBBF24' stop-opacity='0.06'/%3E%3Cstop offset='100%25' stop-color='%23FBBF24' stop-opacity='0'/%3E%3C/radialGradient%3E%3C/defs%3E%3Ccircle cx='400' cy='180' r='300' fill='url(%23glow)'/%3E%3Cline x1='400' y1='140' x2='200' y2='500' stroke='%23D97706' stroke-opacity='0.04' stroke-width='1'/%3E%3Cline x1='400' y1='140' x2='300' y2='520' stroke='%23D97706' stroke-opacity='0.03' stroke-width='1'/%3E%3Cline x1='400' y1='140' x2='500' y2='520' stroke='%23D97706' stroke-opacity='0.03' stroke-width='1'/%3E%3Cline x1='400' y1='140' x2='600' y2='500' stroke='%23D97706' stroke-opacity='0.04' stroke-width='1'/%3E%3Cline x1='400' y1='140' x2='150' y2='450' stroke='%23D97706' stroke-opacity='0.025' stroke-width='1'/%3E%3Cline x1='400' y1='140' x2='650' y2='450' stroke='%23D97706' stroke-opacity='0.025' stroke-width='1'/%3E%3Ccircle cx='400' cy='160' r='8' fill='%23FBBF24' fill-opacity='0.08'/%3E%3Ccircle cx='400' cy='160' r='3' fill='%23FBBF24' fill-opacity='0.12'/%3E%3C/svg%3E");
  background-position: center top;
  background-repeat: no-repeat;
  background-size: 100% auto;
  pointer-events: none;
  z-index: 0;
}

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

.hero h1 {
  font-family: var(--font-heading);
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.hero h1 .highlight {
  color: var(--accent);
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--amber-700);
  background: var(--amber-100);
  border: 1px solid var(--amber-200);
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
}

.hero-badge .badge-dot {
  width: 6px;
  height: 6px;
  background: var(--amber-500);
  border-radius: 50%;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.65;
  text-wrap: pretty;
}

/* ─── Category Section ────────────────────────────────────────────────────── */

.categories-section {
  padding: 3.5rem 0 2.5rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 700;
  margin-bottom: 1.75rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
}

.category-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 0;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition-med);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--amber-200);
}

.category-card:hover::before {
  transform: scaleX(1);
}

.category-icon {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.category-card h3 {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.category-card .category-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.category-card .category-count-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 0.5rem;
}

.category-card .card-arrow {
  position: absolute;
  right: 1.25rem;
  bottom: 1.25rem;
  color: var(--gray-300);
  transition: color var(--transition-fast), transform var(--transition-fast);
  font-size: 1rem;
}

.category-card:hover .card-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ─── Category Hero ───────────────────────────────────────────────────────── */

.category-hero {
  padding: 3.5rem 0 2.5rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.category-hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(
    ellipse at center,
    rgba(251, 191, 36, 0.1) 0%,
    rgba(245, 158, 11, 0.05) 40%,
    transparent 70%
  );
  pointer-events: none;
}

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

.category-hero h1 {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  text-wrap: balance;
}

.category-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.65;
  text-wrap: pretty;
}

.category-count {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--amber-700);
  background: var(--amber-100);
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
}

/* ─── Article Grid ────────────────────────────────────────────────────────── */

.articles-section {
  padding: 2.5rem 0 3.5rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--surface);
  border: 1px solid transparent;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
  position: relative;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition-med);
  z-index: 1;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.article-card:hover::before {
  transform: scaleX(1);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.card-body {
  padding: 1.5rem;
  position: relative;
}

.card-category {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--amber-700);
  background: var(--amber-100);
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  margin-bottom: 0.625rem;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.875rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-wrap: pretty;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.card-arrow {
  color: var(--gray-300);
  transition: color var(--transition-fast), transform var(--transition-fast);
  font-size: 0.9rem;
}

.article-card:hover .card-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ─── Scroll Animations ───────────────────────────────────────────────────── */

.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms var(--ease-out-quart), transform 500ms var(--ease-out-quart);
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children > .fade-in-up:nth-child(1) { transition-delay: 0ms; }
.stagger-children > .fade-in-up:nth-child(2) { transition-delay: 60ms; }
.stagger-children > .fade-in-up:nth-child(3) { transition-delay: 120ms; }
.stagger-children > .fade-in-up:nth-child(4) { transition-delay: 180ms; }
.stagger-children > .fade-in-up:nth-child(5) { transition-delay: 240ms; }
.stagger-children > .fade-in-up:nth-child(6) { transition-delay: 300ms; }
.stagger-children > .fade-in-up:nth-child(7) { transition-delay: 360ms; }
.stagger-children > .fade-in-up:nth-child(8) { transition-delay: 420ms; }
.stagger-children > .fade-in-up:nth-child(9) { transition-delay: 480ms; }

/* ─── Article Page ────────────────────────────────────────────────────────── */

.article-page {
  padding: 2rem 0 3.5rem;
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.5;
}

.breadcrumb a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.breadcrumb .sep {
  margin: 0 0.4rem;
  color: var(--gray-400);
}

/* Article Header */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.article-category-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--amber-700);
  background: var(--amber-100);
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  margin-bottom: 0.75rem;
}

.article-header h1 {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.article-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.meta-sep {
  margin: 0 0.5rem;
}

/* Article Layout (with sidebar TOC on wide screens) */
.article-content {
  max-width: 720px;
  margin: 0 auto;
}

/* Article Body */
.article-body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--gray-800);
}

.article-body p {
  margin-bottom: 1.25rem;
  text-wrap: pretty;
}

.article-body h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.75rem 0 1rem;
  color: var(--text);
  line-height: 1.25;
  letter-spacing: -0.02em;
  padding-left: 0.75rem;
  border-left: 3px solid var(--accent);
}

.article-body h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--text);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.article-body h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--text);
}

.article-body ul,
.article-body ol {
  margin: 1rem 0 1.25rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body li::marker {
  color: var(--accent);
}

.article-body strong {
  font-weight: 700;
  color: var(--text);
}

.article-body a {
  color: var(--accent-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: rgba(217, 119, 6, 0.3);
  transition: text-decoration-color var(--transition-fast);
}

.article-body a:hover {
  text-decoration-color: var(--accent-hover);
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--bg-warm);
  border-radius: 0 8px 8px 0;
  box-shadow: var(--shadow-sm);
}

.article-body blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-body code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9em;
  background: var(--gray-100);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.article-body pre {
  background: var(--gray-900);
  color: #e5e5e5;
  padding: 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.article-body img {
  border-radius: 8px;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 0.9rem;
}

.article-body thead {
  background: var(--gray-100);
}

.article-body th {
  text-align: left;
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
  color: var(--text);
}

.article-body td {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--gray-100);
}

.article-body tbody tr:nth-child(even) {
  background: var(--bg-warm);
}

.article-body tbody tr:last-child td {
  border-bottom: none;
}

.article-body tbody tr {
  transition: background var(--transition-fast);
}

.article-body tbody tr:hover {
  background: var(--amber-50);
}

/* Table of Contents */
.toc {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc ol {
  list-style: none;
  counter-reset: toc;
  margin: 0;
  padding: 0;
}

.toc li {
  counter-increment: toc;
  margin-bottom: 0.35rem;
}

.toc li::before {
  content: counter(toc) ".";
  color: var(--accent);
  font-weight: 600;
  margin-right: 0.5rem;
  font-size: 0.85rem;
}

.toc li.toc-sub {
  padding-left: 1.5rem;
  font-size: 0.9rem;
}

.toc a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Sticky TOC sidebar for wide screens */
@media (min-width: 1200px) {
  .article-page .container {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 3rem;
    align-items: start;
  }

  .article-page .breadcrumb {
    grid-column: 1 / -1;
  }

  .toc {
    position: sticky;
    top: 5rem;
    margin-bottom: 0;
    order: 2;
  }

  .article-content {
    max-width: none;
    order: 1;
  }

  .related-articles {
    grid-column: 1 / -1;
  }
}

/* Related Articles */
.related-articles {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.related-articles h2 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* ─── Back to Top ─────────────────────────────────────────────────────────── */

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-med), transform var(--transition-med), background var(--transition-fast), color var(--transition-fast);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

/* ─── Footer ──────────────────────────────────────────────────────────────── */

.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 0;
  margin-top: 4rem;
}

/* Newsletter section */
.footer-newsletter {
  background: var(--gray-800);
  padding: 2.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.newsletter-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.newsletter-text h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}

.newsletter-text p {
  font-size: 0.9rem;
  color: var(--gray-400);
}

.newsletter-form {
  display: flex;
  gap: 0.5rem;
}

.newsletter-form input {
  font-family: var(--font-body);
  font-size: 0.875rem;
  padding: 0.6rem 1rem;
  border: 1px solid var(--gray-600);
  border-radius: 8px;
  background: var(--gray-700);
  color: #fff;
  min-width: 240px;
  transition: border-color var(--transition-fast);
}

.newsletter-form input::placeholder {
  color: var(--gray-500);
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--amber-500);
}

.newsletter-form button {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast);
}

.newsletter-form button:hover {
  background: var(--amber-500);
}

/* Footer main */
.footer-main {
  padding: 3rem 0 1.5rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-brand-section .footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.footer-brand-section .logo-icon {
  filter: drop-shadow(0 0 6px rgba(245, 158, 11, 0.5));
}

.footer-tagline {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--gray-500);
  margin-top: 0.5rem;
  max-width: 280px;
  line-height: 1.5;
}

.footer-links {
  display: flex;
  gap: 3.5rem;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-300);
  margin-bottom: 0.75rem;
}

.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: var(--gray-400);
  padding: 0.2rem 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--amber-400);
}

.footer-bottom {
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--gray-600);
}

/* ─── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .hero {
    padding: 3.5rem 0 2.5rem;
  }

  .hero h1 {
    font-size: 2.125rem;
  }

  .hero-sub {
    font-size: 1.05rem;
  }

  .article-header h1 {
    font-size: 1.75rem;
  }

  .article-body {
    font-size: 1rem;
  }

  .article-body h2 {
    font-size: 1.3rem;
  }

  .article-body h3 {
    font-size: 1.1rem;
  }

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

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

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

  /* Mobile nav */
  .menu-toggle {
    display: flex;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.25rem;
  }

  .nav-open .main-nav {
    display: block;
  }

  .main-nav .nav-links {
    flex-direction: column;
    gap: 0;
  }

  .main-nav a {
    font-size: 1rem;
    padding: 0.75rem 0;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .main-nav a::after {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
  }

  .footer-links {
    flex-direction: column;
    gap: 1.5rem;
  }

  .newsletter-inner {
    flex-direction: column;
    text-align: center;
  }

  .newsletter-form {
    flex-direction: column;
    width: 100%;
  }

  .newsletter-form input {
    min-width: 0;
    width: 100%;
  }

  .back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
  }
}

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-badge {
    font-size: 0.75rem;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }

  .breadcrumb span:last-child {
    display: none;
  }
}

/* ─── Reduced Motion ──────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .fade-in-up {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }

  .reading-progress {
    transition: none;
  }
}

/* ─── Image Styles ────────────────────────────────────────────────────────── */

.card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--gray-100);
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.article-card:hover .card-img img {
  transform: scale(1.05);
}

.cat-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--gray-100);
}

.cat-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.category-card:hover .cat-img img {
  transform: scale(1.05);
}

.cat-body {
  padding: 1.25rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-hero-img {
  margin-top: 1.25rem;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--gray-100);
}

.article-hero-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.category-hero .cat-img {
  border-radius: 12px;
  margin-bottom: 1.5rem;
}

/* ─── Print ───────────────────────────────────────────────────────────────── */

@media print {
  .site-header, .site-footer, .toc, .related-articles, .breadcrumb,
  .reading-progress, .back-to-top, .footer-newsletter {
    display: none;
  }

  .article-content {
    max-width: 100%;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  body::after {
    display: none;
  }
}