/* =============================================================================
   Clefsoft – System Blueprint Design System
   Microsoft-inspired Technical Blog CSS
   ============================================================================= */

/* ─── CSS Custom Properties ─── */
:root {
  /* Colors – Light */
  --color-primary: #3B82F6;
  --color-primary-hover: #2563EB;
  --color-primary-light: #EFF6FF;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F8FAFC;
  --color-surface-raised: #FFFFFF;
  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #94A3B8;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-code-bg: #1E293B;
  --color-code-text: #E2E8F0;
  --color-success: #10B981;
  --color-warning: #F59E0B;

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

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: clamp(2.5rem, 5vw, 4.5rem);

  /* Layout */
  --max-width: 1200px;
  --max-content: 720px;
  --header-height: 64px;
  --radius: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

/* ─── Dark Mode ─── */
[data-theme="dark"] {
  --color-primary: #60A5FA;
  --color-primary-hover: #93C5FD;
  --color-primary-light: #1E3A5F;
  --color-surface: #0F172A;
  --color-surface-alt: #1E293B;
  --color-surface-raised: #1E293B;
  --color-text: #F1F5F9;
  --color-text-secondary: #94A3B8;
  --color-text-muted: #64748B;
  --color-border: #334155;
  --color-border-light: #1E293B;
  --color-code-bg: #0D1117;
  --color-code-text: #E2E8F0;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 2rem);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-surface);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

/* ─── Skip Link ─── */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: white;
  font-weight: 600;
}

.skip-link:focus {
  left: var(--space-md);
  top: var(--space-md);
  border-radius: var(--radius);
}

/* =============================================================================
   HEADER
   ============================================================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), border-color var(--transition-base);
}

[data-theme="dark"] .site-header {
  background: rgba(15, 23, 42, 0.85);
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background: var(--color-surface-alt);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.btn-icon:hover {
  color: var(--color-text);
  background: var(--color-surface-alt);
}

/* Theme toggle icon visibility */
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* Mobile menu toggle */
.mobile-menu-toggle { display: none; }
.mobile-menu-toggle .icon-close { display: none; }
.mobile-menu-toggle[aria-expanded="true"] .icon-menu { display: none; }
.mobile-menu-toggle[aria-expanded="true"] .icon-close { display: block; }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
}

.mobile-nav[aria-hidden="false"] {
  display: block;
}

.mobile-nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius);
}

.mobile-nav-link:hover {
  background: var(--color-surface-alt);
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .mobile-menu-toggle { display: inline-flex; }
}

/* =============================================================================
   SEARCH OVERLAY
   ============================================================================= */
.search-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  padding: 10vh var(--space-lg) var(--space-lg);
}

.search-overlay[aria-hidden="false"] {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.search-container {
  width: 100%;
  max-width: 640px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

.search-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-muted);
}

.search-input-wrap input {
  flex: 1;
  border: none;
  outline: none;
  background: none;
  font-size: var(--text-base);
  font-family: var(--font-sans);
  color: var(--color-text);
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
  padding: var(--space-md);
}

.search-hint {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding: var(--space-xl);
}

.search-result-item {
  display: block;
  padding: var(--space-md);
  border-radius: var(--radius);
  transition: background var(--transition-fast);
}

.search-result-item:hover {
  background: var(--color-surface-alt);
}

.search-result-item h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.search-result-item p {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* =============================================================================
   HERO
   ============================================================================= */
.hero {
  padding-top: calc(var(--header-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-alt) 100%);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-terminal {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.term-prompt { color: var(--color-primary); font-weight: 600; }
.term-sep { color: var(--color-text-muted); }
.term-path { color: var(--color-text-muted); }
.term-cmd { color: var(--color-text); font-weight: 500; }
.term-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--color-primary);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 540px;
  margin-bottom: var(--space-xl);
}

.hero-subtitle strong {
  color: var(--color-text);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Quick-start terminal card */
.hero-quickstart {
  background: var(--color-code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg);
}

.quickstart-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.qs-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.qs-dot.red { background: #FF5F57; }
.qs-dot.yellow { background: #FEBC2E; }
.qs-dot.green { background: #28C840; }

.qs-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.4);
}

.quickstart-body {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.qs-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: #E2E8F0;
  border-radius: var(--radius);
  transition: background var(--transition-fast);
}

.qs-link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #FFFFFF;
}

.qs-link .qs-prefix {
  color: var(--color-primary);
  font-weight: 600;
}

.qs-link.qs-all {
  margin-top: var(--space-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: var(--space-md);
  color: var(--color-primary);
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .hero-quickstart { max-width: 420px; }
}

@media (max-width: 480px) {
  .hero {
    padding-top: calc(var(--header-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
  }
}

/* =============================================================================
   BUTTONS
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.25rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-outline:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-text-muted);
}

.mt-lg {
  margin-top: var(--space-lg);
}

/* =============================================================================
   SECTIONS
   ============================================================================= */
main {
  padding-top: var(--header-height);
}

.section {
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.section-alt {
  background: var(--color-surface-alt);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  gap: var(--space-md);
}

.section-header h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hash {
  color: var(--color-primary);
  margin-right: var(--space-xs);
  font-weight: 800;
}

.see-all {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  white-space: nowrap;
}

.see-all:hover {
  text-decoration: underline;
}

/* =============================================================================
   POST CARDS
   ============================================================================= */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.featured-grid {
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
}

@media (max-width: 540px) {
  .post-grid, .featured-grid {
    grid-template-columns: 1fr;
  }
}

.post-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-raised);
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  overflow: hidden;
}

.post-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-md);
  transform: translateY(-2px);
}

.post-card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-lg);
  text-decoration: none;
  color: inherit;
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.post-card-category {
  display: inline-block;
  padding: 2px 8px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--text-xs);
  border-radius: 4px;
  text-transform: capitalize;
}

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

.post-card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.post-card-summary {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.post-card-tags {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.mini-tag {
  font-size: 0.6875rem;
  padding: 2px 6px;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  border-radius: 4px;
  font-family: var(--font-mono);
}

.post-card-arrow {
  color: var(--color-primary);
  flex-shrink: 0;
}

/* =============================================================================
   CATEGORY GRID
   ============================================================================= */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-md);
}

.category-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-lg);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.category-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
  transform: translateY(-2px);
}

.category-name {
  font-weight: 600;
  font-size: var(--text-sm);
  text-transform: capitalize;
  color: var(--color-text);
}

.category-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* =============================================================================
   ABOUT BLOCK (Homepage)
   ============================================================================= */
.about-block {
  max-width: var(--max-content);
}

.about-lead {
  font-size: var(--text-lg);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.about-lead strong {
  color: var(--color-primary);
}

.about-block p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

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

.about-tags span {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-secondary);
}

/* =============================================================================
   NEWSLETTER
   ============================================================================= */
.section-cta {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-surface-alt) 100%);
}

.newsletter-block {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-block h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.newsletter-block > p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.newsletter-input-group {
  display: flex;
  gap: var(--space-sm);
  max-width: 420px;
  margin: 0 auto;
}

.newsletter-input-group input {
  flex: 1;
  padding: 0.625rem var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast);
}

.newsletter-input-group input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.newsletter-note {
  margin-top: var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

@media (max-width: 480px) {
  .newsletter-input-group {
    flex-direction: column;
  }
}

/* =============================================================================
   TAXONOMY GRID (Tags/Categories overview)
   ============================================================================= */
.taxonomy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-md);
}

.taxonomy-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface-raised);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.taxonomy-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.taxonomy-name {
  font-weight: 600;
  font-size: var(--text-sm);
  text-transform: capitalize;
}

.taxonomy-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 6px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 700;
  border-radius: 999px;
}

/* =============================================================================
   LIST PAGES
   ============================================================================= */
.list-page {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-4xl);
  min-height: 60vh;
}

.list-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.list-header {
  margin-bottom: var(--space-2xl);
}

.list-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.list-description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
}

.list-count {
  margin-top: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.empty-state {
  text-align: center;
  padding: var(--space-4xl) 0;
  color: var(--color-text-muted);
}

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

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-2xl);
  list-style: none;
}

.pagination .page-item a,
.pagination .page-item span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.pagination .page-item.active span {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.pagination .page-item a:hover {
  background: var(--color-surface-alt);
}

/* =============================================================================
   ARTICLE SINGLE PAGE
   ============================================================================= */
.article {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-4xl);
}

/* Breadcrumbs */
.breadcrumbs {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  padding-top: calc(var(--header-height) + var(--space-md));
}

.breadcrumbs ol {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  list-style: none;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: var(--space-sm);
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

/* Article header */
.article-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.article-header-inner {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.article-meta-top {
  margin-bottom: var(--space-md);
}

.article-category {
  display: inline-block;
  padding: 3px 10px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--text-xs);
  border-radius: 4px;
  text-transform: capitalize;
}

.article-category:hover {
  background: var(--color-primary);
  color: white;
}

.article-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.article-description {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

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

.article-author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.author-avatar.large {
  width: 56px;
  height: 56px;
}

.avatar-initials {
  color: white;
  font-weight: 700;
  font-size: var(--text-sm);
}

.author-avatar.large .avatar-initials {
  font-size: var(--text-lg);
}

.author-name {
  font-weight: 600;
  font-size: var(--text-sm);
}

.article-dates {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

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

.updated-label {
  color: var(--color-success);
}

/* Article layout: 3-column */
.article-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 200px 1fr 200px;
  gap: var(--space-2xl);
}

@media (max-width: 1100px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .article-toc { display: none; }
  .article-sidebar { order: -1; }
}

/* Table of contents */
.article-toc {
  font-size: var(--text-xs);
}

.toc-sticky {
  position: sticky;
  top: calc(var(--header-height) + var(--space-xl));
}

.toc-heading {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.toc-nav ul {
  list-style: none;
  padding-left: 0;
}

.toc-nav li {
  margin-bottom: var(--space-xs);
}

.toc-nav a {
  display: block;
  padding: var(--space-xs) 0;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: 1.5;
  border-left: 2px solid transparent;
  padding-left: var(--space-md);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.toc-nav a:hover {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.toc-nav ul ul { padding-left: var(--space-md); }

/* Article sidebar */
.sidebar-sticky {
  position: sticky;
  top: calc(var(--header-height) + var(--space-xl));
}

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

.sidebar-heading {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.sidebar-tag {
  padding: 3px 8px;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.sidebar-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Share buttons */
.share-buttons {
  display: flex;
  gap: var(--space-sm);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* =============================================================================
   PROSE (Article content typography)
   ============================================================================= */
.prose {
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
}

.prose > * + * {
  margin-top: 1.5em;
}

.prose h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2.5em;
  margin-bottom: 0.75em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-top: 2em;
  margin-bottom: 0.5em;
}

.prose h4 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.prose p {
  margin-bottom: 1.25em;
}

.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

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

.prose ul, .prose ol {
  padding-left: 1.5em;
  margin-bottom: 1.25em;
}

.prose li {
  margin-bottom: 0.5em;
}

.prose li::marker {
  color: var(--color-primary);
}

.prose blockquote {
  border-left: 3px solid var(--color-primary);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.prose code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-primary);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2em 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  margin: 1.5em 0;
}

.prose th, .prose td {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  text-align: left;
}

.prose th {
  font-weight: 600;
  background: var(--color-surface-alt);
}

/* Article images */
.article-image {
  margin: 2em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.article-image img {
  width: 100%;
}

.article-image figcaption {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
}

/* =============================================================================
   CODE BLOCKS (System Window)
   ============================================================================= */
.code-window {
  margin: 1.5em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-code-bg);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.code-language {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.5);
  text-transform: lowercase;
}

.code-copy {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  background: transparent;
  color: rgba(255, 255, 255, 0.5);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.code-copy:hover {
  color: white;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.05);
}

.code-body {
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.code-body pre {
  margin: 0;
  padding: 0;
  background: transparent;
}

.code-body code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-code-text);
  tab-size: 4;
}

/* Fallback for Hugo's default highlight without render hook */
.highlight {
  margin: 1.5em 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.highlight pre {
  padding: var(--space-md) var(--space-lg);
  overflow-x: auto;
  margin: 0;
  background: var(--color-code-bg) !important;
}

.highlight code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-code-text);
}

/* =============================================================================
   ARTICLE FOOTER
   ============================================================================= */
.article-footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-3xl);
}

.article-footer-inner {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

/* Author card */
.author-card {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2xl);
}

.author-card h4 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.author-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.author-card-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.author-card-link:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .author-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* Prev / Next navigation */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

@media (max-width: 540px) {
  .article-nav {
    grid-template-columns: 1fr;
  }
}

.article-nav-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition-fast);
}

.article-nav-link:hover {
  border-color: var(--color-primary);
}

.article-nav-link.next {
  text-align: right;
}

.nav-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

/* Related posts */
.related-posts h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

/* =============================================================================
   ABOUT PAGE
   ============================================================================= */
.about-page {
  padding-top: calc(var(--space-xl));
  padding-bottom: var(--space-4xl);
}

.about-page-inner {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.about-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.about-avatar-large {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
}

.about-avatar-large .avatar-initials {
  font-size: var(--text-3xl);
}

.about-header h1 {
  font-size: var(--text-3xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.about-subtitle {
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-weight: 500;
}

.about-location {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.about-body {
  margin-bottom: var(--space-2xl);
}

.expertise-section {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-2xl);
}

.expertise-section h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}

.expertise-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.expertise-tag {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border: 1px solid transparent;
  border-radius: var(--radius);
}

/* =============================================================================
   RESOURCES PAGE
   ============================================================================= */
.resources-page {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-4xl);
}

.resources-inner {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.resources-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.resources-header h1 {
  font-size: var(--text-3xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.resources-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
}

/* =============================================================================
   404 PAGE
   ============================================================================= */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.05em;
}

.error-page h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.error-page p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.error-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

/* =============================================================================
   FOOTER
   ============================================================================= */
.site-footer {
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

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

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

.footer-brand-name {
  font-weight: 700;
  font-size: var(--text-lg);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.footer-email {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.footer-email:hover {
  text-decoration: underline;
}

.footer-heading {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-stack li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.stack-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  flex-shrink: 0;
}

.footer-feed {
  margin-top: var(--space-lg);
}

.footer-feed a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

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

.footer-legal .sep {
  color: var(--color-border);
}

.footer-legal a {
  color: var(--color-text-muted);
}

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

@media (max-width: 480px) {
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* =============================================================================
   ACCESSIBILITY
   ============================================================================= */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* =============================================================================
   PRINT
   ============================================================================= */
@media print {
  .site-header, .site-footer, .article-sidebar, .article-toc,
  .article-nav, .related-posts, .share-buttons, .newsletter-block,
  .search-overlay, .mobile-nav { display: none !important; }

  body { background: white; color: black; font-size: 12pt; }
  .article-layout { display: block; }
  .article-content { max-width: 100%; }
}