/* ============================================================
   BlogAndroid.es — Global Stylesheet
   Paleta: Dark #0a0a0f + Android Green #3DDC84 + Off-white
   Tipografía: Space Grotesk (títulos) + Inter (cuerpo)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ============================================================
   1. VARIABLES CSS
   ============================================================ */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;

  --accent-green: #3DDC84;
  --accent-green-dim: #2ab86a;
  --accent-green-soft: #a8e6c3;
  --accent-green-glow: rgba(61, 220, 132, 0.15);

  --text-primary: #f0f0f5;
  --text-secondary: #9898b0;
  --text-muted: #606078;

  --border-subtle: rgba(61, 220, 132, 0.12);
  --border-card: rgba(255, 255, 255, 0.06);
  --border-glow: rgba(61, 220, 132, 0.4);

  --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #0f1a14 50%, #0a0a0f 100%);
  --gradient-card: linear-gradient(145deg, #16161f, #1a1a26);
  --gradient-accent: linear-gradient(90deg, #3DDC84, #2ab86a);
  --gradient-text: linear-gradient(135deg, #3DDC84 0%, #a8e6c3 100%);

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(61, 220, 132, 0.2);
  --shadow-glow: 0 0 30px rgba(61, 220, 132, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --transition-fast: all 0.2s ease;
  --transition-base: all 0.3s ease;
  --transition-slow: all 0.5s ease;

  --max-width: 1200px;
  --article-width: 720px;
  --sidebar-width: 300px;
}

/* Dark mode inverse (for light mode toggle) */
[data-theme="light"] {
  --bg-primary: #f5f5f8;
  --bg-secondary: #ededf3;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f8;

  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #8888aa;

  --border-subtle: rgba(61, 220, 132, 0.2);
  --border-card: rgba(0, 0, 0, 0.08);

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(61, 220, 132, 0.3);

  --gradient-hero: linear-gradient(135deg, #eef8f3 0%, #f5f5f8 50%, #eef3f8 100%);
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.4s ease, color 0.4s ease;
}

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

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

a:hover {
  color: var(--accent-green-soft);
}

ul, ol {
  list-style: none;
}

/* ============================================================
   3. READING PROGRESS BAR
   ============================================================ */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-accent);
  z-index: 9999;
  transition: width 0.1s linear;
  box-shadow: 0 0 10px rgba(61, 220, 132, 0.6);
}

/* ============================================================
   4. HEADER & NAVIGATION
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-base);
}

[data-theme="light"] .site-header {
  background: rgba(245, 245, 248, 0.85);
}

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo__icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #000;
  font-family: var(--font-display);
  box-shadow: 0 0 16px rgba(61, 220, 132, 0.35);
  transition: var(--transition-base);
}

.header__logo:hover .logo__icon {
  box-shadow: 0 0 24px rgba(61, 220, 132, 0.55);
  transform: scale(1.05);
}

.logo__text {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo__text span {
  color: var(--accent-green);
}

.header__nav {
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav__link:hover,
.nav__link.active {
  color: var(--text-primary);
  background: var(--accent-green-glow);
}

.nav__link.active {
  color: var(--accent-green);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-card);
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: var(--transition-fast);
}

.btn-theme-toggle:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: var(--accent-green-glow);
}

.btn-menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-card);
  background: transparent;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: var(--transition-fast);
}

.btn-menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition-base);
}

.btn-menu-toggle:hover span {
  background: var(--accent-green);
}

.btn-menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.btn-menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.btn-menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav drawer */
.mobile-nav {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: rgba(10, 10, 15, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 20px 24px 28px;
  z-index: 999;
  animation: slideDown 0.25s ease;
}

[data-theme="light"] .mobile-nav {
  background: rgba(245, 245, 248, 0.97);
}

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

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

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  display: block;
}

.mobile-nav__link:hover {
  color: var(--text-primary);
  background: var(--accent-green-glow);
}

/* ============================================================
   5. HERO SECTION
   ============================================================ */
.hero {
  background: var(--gradient-hero);
  padding: 80px 24px 72px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(61, 220, 132, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(61, 220, 132, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-green);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--accent-green-glow);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
  animation: fadeInUp 0.6s ease both;
}

.hero__label::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__title .highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.7;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: #000;
  background: var(--gradient-accent);
  padding: 13px 28px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: 0 4px 20px rgba(61, 220, 132, 0.3);
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(61, 220, 132, 0.45);
  color: #000;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
  cursor: pointer;
  transition: var(--transition-base);
  text-decoration: none;
}

.btn-secondary:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: var(--accent-green-glow);
  transform: translateY(-2px);
}

/* ============================================================
   6. SECTION LAYOUT
   ============================================================ */
.section {
  padding: 72px 24px;
}

.section--alt {
  background: var(--bg-secondary);
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__header {
  margin-bottom: 48px;
}

.section__label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-green);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.2;
}

/* ============================================================
   7. ARTICLE CARDS
   ============================================================ */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-base);
  box-shadow: var(--shadow-card);
  position: relative;
  animation: fadeInUp 0.6s ease both;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-subtle);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: var(--transition-base);
}

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

.card__image-wrapper {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-secondary);
}

.card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card__image {
  transform: scale(1.04);
}

.card__body {
  padding: 24px;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.card__category {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-green);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--accent-green-glow);
  border: 1px solid var(--border-subtle);
  padding: 3px 10px;
  border-radius: 100px;
}

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

.card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 10px;
  letter-spacing: -0.015em;
  transition: var(--transition-fast);
}

.card:hover .card__title {
  color: var(--accent-green-soft);
}

.card__excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  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-card);
}

.card__read-time {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.card__link {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-fast);
}

.card__link:hover {
  gap: 10px;
  color: var(--accent-green-soft);
}

/* Featured card (first one, larger) */
.card--featured {
  grid-column: 1 / -1;
}

/* ============================================================
   8. ARTICLE PAGE LAYOUT
   ============================================================ */
.article-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 72px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding: 0 24px;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-top: 32px;
}

.breadcrumb__item {
  font-size: 0.83rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

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

.breadcrumb__separator {
  color: var(--text-muted);
  font-size: 0.7rem;
}

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

/* Article header */
.article__header {
  margin-bottom: 40px;
}

.article__category-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-green);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--accent-green-glow);
  border: 1px solid var(--border-subtle);
  padding: 4px 12px;
  border-radius: 100px;
}

.article__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.article__lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
  border-left: 3px solid var(--accent-green);
  padding-left: 20px;
}

.article__meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
}

.article__author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.author__avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-subtle);
}

.author__info {
  display: flex;
  flex-direction: column;
}

.author__name {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.meta-divider {
  width: 1px;
  height: 32px;
  background: var(--border-card);
}

.article__meta-item {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Article featured image */
.article__cover {
  width: 100%;
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
  overflow: hidden;
  aspect-ratio: 16/7;
}

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

/* Article body prose */
.article__body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article__body h2 {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin: 52px 0 20px;
  padding-top: 8px;
  position: relative;
  scroll-margin-top: 88px;
}

.article__body h2::before {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.article__body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 36px 0 14px;
  scroll-margin-top: 88px;
}

.article__body p {
  margin-bottom: 20px;
}

.article__body a {
  color: var(--accent-green);
  text-decoration: underline;
  text-decoration-color: rgba(61, 220, 132, 0.35);
  text-underline-offset: 3px;
  transition: var(--transition-fast);
}

.article__body a:hover {
  text-decoration-color: var(--accent-green);
}

.article__body ul,
.article__body ol {
  margin: 20px 0 24px 0;
  padding-left: 0;
}

.article__body ul li,
.article__body ol li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.article__body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
}

.article__body ol {
  counter-reset: ol-counter;
}

.article__body ol li {
  counter-increment: ol-counter;
}

.article__body ol li::before {
  content: counter(ol-counter) '.';
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-green);
}

.article__body strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* Callout / highlight box */
.callout {
  background: rgba(61, 220, 132, 0.05);
  border: 1px solid rgba(61, 220, 132, 0.2);
  border-left: 4px solid var(--accent-green);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
}

.callout p {
  margin-bottom: 0 !important;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.callout strong {
  color: var(--accent-green) !important;
}

/* ============================================================
   9. SIDEBAR
   ============================================================ */
.sidebar {
  display: none;
}

.sidebar__widget {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.widget__title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-card);
  display: flex;
  align-items: center;
  gap: 8px;
}

.widget__title::before {
  content: '';
  width: 3px;
  height: 16px;
  background: var(--gradient-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

/* TOC Widget */
.toc-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-list__item {
  display: block;
}

.toc-list__link {
  display: block;
  font-size: 0.86rem;
  color: var(--text-secondary);
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  line-height: 1.4;
  border-left: 2px solid transparent;
}

.toc-list__link:hover,
.toc-list__link.active {
  color: var(--accent-green);
  background: var(--accent-green-glow);
  border-left-color: var(--accent-green);
}

/* Recent Posts Widget */
.recent-posts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.recent-post {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  text-decoration: none;
  transition: var(--transition-fast);
}

.recent-post__thumb {
  width: 64px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
  background: var(--bg-secondary);
}

.recent-post__info {
  flex: 1;
}

.recent-post__title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.4;
  transition: var(--transition-fast);
  margin-bottom: 4px;
}

.recent-post:hover .recent-post__title {
  color: var(--accent-green);
}

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

/* About widget */
.about-widget__text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

/* ============================================================
   10. RELATED ARTICLES
   ============================================================ */
.related-articles {
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--border-card);
}

.related-articles__title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

/* ============================================================
   11. FOOTER
   ============================================================ */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-card);
  padding: 48px 24px 28px;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer__brand {
  max-width: 340px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  text-decoration: none;
}

.footer__description {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.footer__col-title {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__link {
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.footer__link:hover {
  color: var(--accent-green);
}

.footer__bottom {
  border-top: 1px solid var(--border-card);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.footer__copyright {
  font-size: 0.83rem;
  color: var(--text-muted);
}

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

.footer__made-with span {
  color: var(--accent-green);
}

/* ============================================================
   12. ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }

/* ============================================================
   13. UTILITIES
   ============================================================ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

/* ============================================================
   14. RESPONSIVE — TABLET (768px+)
   ============================================================ */
@media (min-width: 768px) {
  .header__nav {
    display: block;
  }

  .btn-menu-toggle {
    display: none;
  }

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

  .card--featured {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-column: 1 / -1;
  }

  .card--featured .card__image-wrapper {
    aspect-ratio: auto;
    height: 100%;
    min-height: 280px;
  }

  .footer__top {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }

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

  .breadcrumb {
    padding-top: 40px;
  }
}

/* ============================================================
   15. RESPONSIVE — DESKTOP (1024px+)
   ============================================================ */
@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .article-layout {
    grid-template-columns: 1fr var(--sidebar-width);
    align-items: start;
    gap: 56px;
  }

  .sidebar {
    display: block;
    position: sticky;
    top: 88px;
  }

  .toc-widget {
    /* sticky positioning handled by parent */
  }
}

/* ============================================================
   16. RESPONSIVE — LARGE (1280px+)
   ============================================================ */
@media (min-width: 1280px) {
  .hero {
    padding: 100px 24px 90px;
  }

  .section {
    padding: 88px 24px;
  }
}