/* =============================================
   KnowledgeVerse — Main Stylesheet
   Premium Knowledge Publishing Platform
   ============================================= */

/* ── Variables ──────────────────────────────── */
:root {
  --primary: #5C3B9E;
  --primary-light: #7B5BC4;
  --primary-dark: #3D2470;
  --accent: #F5B942;
  --accent-light: #FDD27A;
  --accent-dark: #D9960F;
  --bg: #ffffff;
  --bg-secondary: #F8F7FF;
  --bg-tertiary: #F1F0F8;
  --surface: #ffffff;
  --surface-hover: #F8F7FF;
  --border: #E5E3F0;
  --border-light: #F0EEF8;
  --text-primary: #0F0A1E;
  --text-secondary: #4A4560;
  --text-muted: #8B84A3;
  --text-inverse: #ffffff;
  --shadow-sm: 0 1px 3px rgba(92,59,158,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(92,59,158,0.10), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(92,59,158,0.14), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-xl: 0 24px 64px rgba(92,59,158,0.18), 0 8px 24px rgba(0,0,0,0.10);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Merriweather', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --nav-height: 72px;
  --max-width: 1280px;
  --content-width: 720px;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode */
[data-theme="dark"] {
  --bg: #121212;
  --bg-secondary: #1A1A2E;
  --bg-tertiary: #1E1E32;
  --surface: #1A1A2E;
  --surface-hover: #252540;
  --border: #2A2A45;
  --border-light: #222238;
  --text-primary: #F0EEFF;
  --text-secondary: #B0A8CC;
  --text-muted: #6A628A;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.6);
}

/* ── 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-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition-slow), color var(--transition-slow);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }

/* ── Layout ─────────────────────────────────── */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 860px; }
.container--content { max-width: var(--content-width); }

/* ── Navigation ─────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition);
}
[data-theme="dark"] .nav {
  background: rgba(18,18,18,0.92);
}
.nav.scrolled { box-shadow: var(--shadow-md); }
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 32px;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  flex-shrink: 0;
  letter-spacing: -0.02em;
}
.nav__logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(92,59,158,0.35);
}
.nav__logo span { color: var(--primary); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav__link {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav__link:hover, .nav__link.active {
  color: var(--primary);
  background: rgba(92,59,158,0.08);
}
.nav__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.nav__search-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
  background: var(--bg-secondary);
}
.nav__search-btn:hover { background: var(--bg-tertiary); color: var(--primary); }
.nav__theme-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
  background: var(--bg-secondary);
  font-size: 1rem;
}
.nav__theme-btn:hover { background: var(--bg-tertiary); color: var(--primary); }
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  transition: background var(--transition);
}
.nav__hamburger:hover { background: var(--bg-tertiary); }
.nav__hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav__hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile menu */
.nav__mobile {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg);
  z-index: 999;
  padding: 24px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}
.nav__mobile.open { transform: translateX(0); }
.nav__mobile-links { display: flex; flex-direction: column; gap: 4px; }
.nav__mobile-link {
  display: block;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition);
}
.nav__mobile-link:hover { background: var(--bg-secondary); color: var(--primary); }
.nav__mobile-divider { height: 1px; background: var(--border); margin: 16px 0; }

/* ── Hero ────────────────────────────────────── */
.hero {
  position: relative;
  padding: 100px 0 80px;
  overflow: hidden;
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-secondary) 60%, var(--bg-tertiary) 100%);
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(92,59,158,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245,185,66,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(92,59,158,0.08);
  border: 1px solid rgba(92,59,158,0.18);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}
.hero__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 50%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__title-accent { color: var(--accent); -webkit-text-fill-color: var(--accent); }
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.hero__stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}
.hero__stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 500;
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
  letter-spacing: -0.01em;
}
.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 16px rgba(92,59,158,0.35);
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: white;
  box-shadow: 0 8px 24px rgba(92,59,158,0.45);
  transform: translateY(-2px);
}
.btn-secondary {
  background: var(--bg);
  color: var(--text-primary);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.btn-accent {
  background: var(--accent);
  color: #1A0A00;
  box-shadow: 0 4px 16px rgba(245,185,66,0.35);
}
.btn-accent:hover {
  background: var(--accent-dark);
  color: #1A0A00;
  box-shadow: 0 8px 24px rgba(245,185,66,0.45);
  transform: translateY(-2px);
}
.btn-ghost {
  color: var(--primary);
  border-color: rgba(92,59,158,0.25);
  background: transparent;
}
.btn-ghost:hover {
  background: rgba(92,59,158,0.08);
  border-color: var(--primary);
}
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-lg { padding: 16px 32px; font-size: 1.05rem; }

/* ── Section Headers ─────────────────────────── */
.section { padding: 80px 0; }
.section--alt { background: var(--bg-secondary); }
.section__header { margin-bottom: 52px; }
.section__header--center { text-align: center; }
.section__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.section__label::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}
.section__title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.section__subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 560px;
}
.section__header--center .section__subtitle { margin: 0 auto; }
.section__link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  transition: gap var(--transition);
}
.section__link:hover { gap: 10px; }

/* ── Article Cards ───────────────────────────── */
.articles-grid {
  display: grid;
  gap: 24px;
}
.articles-grid--3 { grid-template-columns: repeat(3, 1fr); }
.articles-grid--2 { grid-template-columns: repeat(2, 1fr); }
.articles-grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: rgba(92,59,158,0.2);
}
.card__image {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-tertiary);
}
.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.card:hover .card__image img { transform: scale(1.05); }
.card__category-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: var(--primary);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}
.card__badge-featured {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--accent);
  color: #1A0A00;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}
.card__body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.card__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.card__meta-item { display: flex; align-items: center; gap: 5px; }
.card__title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
  transition: color var(--transition);
}
.card:hover .card__title { color: var(--primary); }
.card__excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
  margin-top: auto;
}
.card__reading {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}
.card__arrow {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  transition: all var(--transition);
  font-size: 0.85rem;
}
.card:hover .card__arrow {
  background: var(--primary);
  color: white;
  transform: rotate(45deg);
}

/* Featured/Hero card */
.card--featured {
  grid-column: span 2;
  flex-direction: row;
}
.card--featured .card__image {
  width: 45%;
  flex-shrink: 0;
  aspect-ratio: auto;
  min-height: 280px;
}
.card--featured .card__title { font-size: 1.4rem; }
.card--featured .card__excerpt { -webkit-line-clamp: 4; }
.card--featured .card__body { padding: 28px; }

/* Horizontal card */
.card--horizontal {
  flex-direction: row;
  align-items: center;
}
.card--horizontal .card__image {
  width: 120px;
  height: 90px;
  aspect-ratio: auto;
  flex-shrink: 0;
  border-radius: 0;
}
.card--horizontal .card__body { padding: 16px; }
.card--horizontal .card__title { font-size: 0.95rem; -webkit-line-clamp: 2; }
.card--horizontal .card__excerpt { display: none; }

/* ── Category Cards ──────────────────────────── */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.category-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: block;
  color: var(--text-primary);
}
.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  opacity: 0;
  transition: opacity var(--transition);
}
.category-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  color: white;
}
.category-card:hover::before { opacity: 1; }
.category-card__icon {
  font-size: 2rem;
  margin-bottom: 12px;
  display: block;
  position: relative;
  z-index: 1;
}
.category-card__name {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}
.category-card__count {
  font-size: 0.75rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
  transition: color var(--transition);
}
.category-card:hover .category-card__count { color: rgba(255,255,255,0.7); }
.category-card__desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 8px;
  position: relative;
  z-index: 1;
  transition: color var(--transition);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.category-card:hover .category-card__desc { color: rgba(255,255,255,0.8); }

/* ── Search ──────────────────────────────────── */
.search-bar {
  position: relative;
  max-width: 640px;
  margin: 0 auto;
}
.search-bar__input {
  width: 100%;
  padding: 16px 56px 16px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 1rem;
  background: var(--surface);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.search-bar__input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(92,59,158,0.12);
}
.search-bar__input::placeholder { color: var(--text-muted); }
.search-bar__btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  font-size: 1rem;
}
.search-bar__btn:hover { background: var(--primary-dark); }
.search-results { margin-top: 24px; }
.search-filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.filter-btn {
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ── Article Page ────────────────────────────── */
.article-hero {
  position: relative;
  height: 480px;
  overflow: hidden;
}
.article-hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.6) 100%);
}
.article-header {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 20px 0;
}
.breadcrumb a { color: var(--text-muted); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb__sep { color: var(--border); }
.article__category-badge {
  display: inline-block;
  background: rgba(92,59,158,0.1);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  border: 1px solid rgba(92,59,158,0.2);
}
.article__title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}
.article__meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
.article__meta-item { display: flex; align-items: center; gap: 6px; }
.article__content {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--text-primary);
}
.article__content h2 {
  font-family: var(--font-sans);
  font-size: 1.7rem;
  font-weight: 800;
  margin: 2.5em 0 0.75em;
  letter-spacing: -0.02em;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}
.article__content h3 {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2em 0 0.6em;
  letter-spacing: -0.015em;
}
.article__content p { margin-bottom: 1.4em; }
.article__content ul, .article__content ol {
  margin-bottom: 1.4em;
  padding-left: 1.8em;
  list-style: revert;
}
.article__content li { margin-bottom: 0.5em; }
.article__content strong { font-weight: 700; color: var(--text-primary); }
.article__content em { font-style: italic; }
.article__content blockquote {
  border-left: 4px solid var(--primary);
  margin: 2em 0;
  padding: 20px 28px;
  background: linear-gradient(135deg, rgba(92,59,158,0.06), rgba(92,59,158,0.02));
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-secondary);
}
.article__content blockquote::before { content: none; }
.article__content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-tertiary);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 5px;
  border: 1px solid var(--border);
}
.article__content pre {
  background: #1A1A2E;
  border-radius: var(--radius-md);
  padding: 24px;
  overflow-x: auto;
  margin: 2em 0;
  border: 1px solid #2A2A45;
}
.article__content pre code {
  background: none;
  border: none;
  color: #E0D8FF;
  font-size: 0.9rem;
  padding: 0;
}
.article__content a { color: var(--primary); text-decoration: underline; text-decoration-color: rgba(92,59,158,0.3); text-underline-offset: 3px; }
.article__content a:hover { text-decoration-color: var(--primary); }
.article__content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2em 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}
.article__content th {
  background: var(--bg-secondary);
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
  border: 1px solid var(--border);
  font-family: var(--font-sans);
  color: var(--text-primary);
}
.article__content td {
  padding: 11px 16px;
  border: 1px solid var(--border);
  vertical-align: top;
}
.article__content tr:nth-child(even) td { background: var(--bg-secondary); }
.article__content img { border-radius: var(--radius-md); margin: 2em auto; box-shadow: var(--shadow-md); }

/* Info boxes */
.info-box {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  margin: 2em 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.65;
}
.info-box--info { background: rgba(14,165,233,0.08); border: 1px solid rgba(14,165,233,0.2); color: var(--text-secondary); }
.info-box--warning { background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.2); color: var(--text-secondary); }
.info-box--success { background: rgba(16,185,129,0.08); border: 1px solid rgba(16,185,129,0.2); color: var(--text-secondary); }
.info-box--danger { background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.2); color: var(--text-secondary); }
.info-box__icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }

/* TOC */
.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 40px;
}
.toc__title {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.toc__list { display: flex; flex-direction: column; gap: 8px; }
.toc__item { font-family: var(--font-sans); }
.toc__link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  transition: color var(--transition);
  padding: 4px 0;
}
.toc__link:hover { color: var(--primary); }
.toc__link::before {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 8px;
}
.toc__link--h3 { padding-left: 20px; font-size: 0.85rem; }

/* Article layout */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.article-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  align-self: start;
}
.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}
.sidebar-card__title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* FAQ */
.faq { margin: 2.5em 0; }
.faq__title {
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.015em;
}
.faq__item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--surface);
  font-family: var(--font-sans);
}
.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition);
  text-align: left;
}
.faq__question:hover { background: var(--bg-secondary); }
.faq__question.open { color: var(--primary); }
.faq__icon { font-size: 1.1rem; transition: transform var(--transition); flex-shrink: 0; }
.faq__question.open .faq__icon { transform: rotate(45deg); }
.faq__answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-slow);
}
.faq__answer.open { padding: 0 20px 18px; max-height: 400px; }
.faq__answer p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.65; }

/* ── Newsletter ──────────────────────────────── */
.newsletter {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  border-radius: var(--radius-xl);
  padding: 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.newsletter::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(245,185,66,0.2) 0%, transparent 70%);
  pointer-events: none;
}
.newsletter__title {
  font-size: 2rem;
  font-weight: 800;
  color: white;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}
.newsletter__subtitle {
  color: rgba(255,255,255,0.75);
  margin-bottom: 32px;
  font-size: 1.05rem;
}
.newsletter__form {
  display: flex;
  max-width: 480px;
  margin: 0 auto;
  gap: 10px;
  flex-wrap: wrap;
}
.newsletter__input {
  flex: 1;
  min-width: 240px;
  padding: 14px 20px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  background: rgba(255,255,255,0.15);
  color: white;
  outline: none;
  backdrop-filter: blur(10px);
  transition: background var(--transition);
}
.newsletter__input::placeholder { color: rgba(255,255,255,0.55); }
.newsletter__input:focus { background: rgba(255,255,255,0.22); }
.newsletter__btn {
  padding: 14px 28px;
  background: var(--accent);
  color: #1A0A00;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.newsletter__btn:hover { background: var(--accent-light); transform: translateY(-2px); }
.newsletter__note { font-size: 0.8rem; color: rgba(255,255,255,0.5); margin-top: 12px; }

/* ── Footer ──────────────────────────────────── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer__brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-top: 14px;
  max-width: 280px;
}
.footer__col-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.footer__links { display: flex; flex-direction: column; gap: 10px; }
.footer__link {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer__link:hover { color: var(--primary); }
.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  gap: 16px;
  flex-wrap: wrap;
}
.footer__copyright {
  font-size: 0.84rem;
  color: var(--text-muted);
}
.footer__bottom-links {
  display: flex;
  gap: 20px;
}
.footer__bottom-link {
  font-size: 0.84rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer__bottom-link:hover { color: var(--primary); }

/* ── Badges & Tags ───────────────────────────── */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.tag:hover { background: rgba(92,59,158,0.1); color: var(--primary); border-color: rgba(92,59,158,0.2); }
.tags-list { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Trending Section ────────────────────────── */
.trending-list { display: flex; flex-direction: column; gap: 0; }
.trending-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition);
}
.trending-item:last-child { border-bottom: none; }
.trending-item:hover .trending-item__title { color: var(--primary); }
.trending-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--border);
  line-height: 1;
  width: 36px;
  flex-shrink: 0;
  letter-spacing: -0.04em;
}
.trending-item__content { flex: 1; min-width: 0; }
.trending-item__category {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}
.trending-item__title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  transition: color var(--transition);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.trending-item__meta { font-size: 0.78rem; color: var(--text-muted); margin-top: 6px; }

/* ── Skeleton Loading ────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* ── Page Hero ───────────────────────────────── */
.page-hero {
  padding: 64px 0;
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-secondary) 100%);
  border-bottom: 1px solid var(--border);
}
.page-hero__title { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.025em; margin-bottom: 12px; }
.page-hero__subtitle { font-size: 1.05rem; color: var(--text-secondary); }

/* ── Article Navigation ──────────────────────── */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}
.article-nav__item {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  background: var(--surface);
  display: block;
  color: var(--text-primary);
}
.article-nav__item:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.article-nav__label { font-size: 0.75rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.article-nav__title { font-size: 0.95rem; font-weight: 700; line-height: 1.4; }
.article-nav__item--next { text-align: right; }

/* ── Utility ─────────────────────────────────── */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: var(--font-mono); }
.divider { height: 1px; background: var(--border); margin: 40px 0; }
.center { text-align: center; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }

/* ── Pagination ──────────────────────────────── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.pagination__btn {
  min-width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.pagination__btn:hover, .pagination__btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.pagination__dots {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 0 4px;
}

/* ── 404 / Empty ─────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 80px 24px;
}
.empty-state__icon { font-size: 4rem; margin-bottom: 24px; }
.empty-state__title { font-size: 1.5rem; font-weight: 800; margin-bottom: 12px; }
.empty-state__text { color: var(--text-secondary); margin-bottom: 28px; }

/* ── Progress / Reading ──────────────────────── */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  z-index: 9999;
  transition: width 0.1s linear;
  border-radius: 0 2px 2px 0;
}

/* ── Back to Top ─────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  transition: all var(--transition);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ── Cookie Banner ───────────────────────────── */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  z-index: 998;
  box-shadow: 0 -8px 32px rgba(0,0,0,0.1);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}
.cookie-banner.visible { transform: translateY(0); }
.cookie-banner p { font-size: 0.875rem; color: var(--text-secondary); }

/* ── Scroll animations ──────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }