:root {
  --color-bg: #FAFAF8;
  --color-surface: #FFFFFF;
  --color-surface-raised: #F3F2EF;
  --color-border: #E4E2DC;
  --color-text-primary: #1A1916;
  --color-text-secondary: #6B6860;
  --color-text-muted: #9E9C96;
  --color-accent: #D4500A;
  --color-accent-hover: #B84208;
  --color-accent-subtle: #FDF0E8;
  --color-success: #2D7A4F;
  --color-warning: #A36200;
  --color-code-bg: #F0EEE9;
  --color-shadow: rgba(26, 25, 22, 0.08);
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-ui: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 17px;
  --text-md: 18px;
  --text-lg: 20px;
  --text-xl: 22px;
  --text-2xl: 28px;
  --text-3xl: 36px;
  --text-4xl: 40px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --article-max-width: 680px;
  --sidebar-width: 300px;
  --page-max-width: 1120px;
  --header-height: 60px;
  --transition-fast: 150ms ease;
  --transition-std: 200ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #141412;
    --color-surface: #1E1D1A;
    --color-surface-raised: #272520;
    --color-border: #2E2C28;
    --color-text-primary: #F0EDE6;
    --color-text-secondary: #9A9790;
    --color-text-muted: #6B6860;
    --color-accent: #F07040;
    --color-accent-hover: #F58A5A;
    --color-accent-subtle: #2A1A10;
    --color-success: #4CAF7D;
    --color-warning: #E0A030;
    --color-code-bg: #272520;
    --color-shadow: rgba(0, 0, 0, 0.3);
  }
}

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

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

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

img[width][height] {
  aspect-ratio: attr(width) / attr(height);
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

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

ul, ol {
  padding-left: var(--space-lg);
}

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

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-xl);
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-std);
}

.site-header.scrolled {
  box-shadow: 0 1px 8px var(--color-shadow);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.site-logo {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.site-logo::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

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

.site-nav {
  display: none;
  gap: var(--space-lg);
  align-items: center;
}

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

.site-nav a {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  padding: var(--space-xs);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 99;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--transition-std), transform var(--transition-std);
}

.mobile-nav.open {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.mobile-nav a {
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.site-footer {
  margin-top: auto;
  background-color: var(--color-surface-raised);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-primary);
}

.footer-tagline {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

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

.footer-nav a {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-copy {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

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

@media (min-width: 1024px) {
  .posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-decoration: none;
  transition: box-shadow var(--transition-std), transform var(--transition-std);
}

.post-card:hover {
  box-shadow: 0 4px 16px var(--color-shadow);
  transform: translateY(-2px);
}

.post-card-category {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.post-card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  transition: color var(--transition-fast);
}

.post-card:hover .post-card-title {
  color: var(--color-accent);
}

.post-card-meta {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: auto;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

.badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  border-radius: var(--radius-sm);
  padding: 3px 10px;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.badge:hover {
  background: color-mix(in srgb, var(--color-accent-subtle) 80%, var(--color-accent) 20%);
  color: var(--color-accent);
}

.ad-container {
  margin: var(--space-xl) auto;
  text-align: center;
  min-height: 90px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.ad-container::before {
  content: "Advertisement";
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

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

.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-accent { color: var(--color-accent); }
.font-ui { font-family: var(--font-ui); }
.font-display { font-family: var(--font-display); }