:root { --color-primary: #8B5E3C; }
:root {
  --color-primary-hover: #6D4A2F;
  --color-bg: #FAF8F5;
  --color-surface: #FFFFFF;
  --color-text: #2A2118;
  --color-text-secondary: #6B5D4D;
  --color-text-muted: #9A8B7A;
  --color-border: #E8E0D6;
  --color-border-light: #F0EBE4;
  --font-body: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", monospace;
  --max-content: 720px;
  --max-wide: 1100px;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4.5rem;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  z-index: 1000;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  font-size: 0.875rem;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.header-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.site-brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

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

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

.nav-link {
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  border-radius: 4px;
  transition: color 150ms, background 150ms;
}

.nav-link:hover, .nav-link:focus {
  color: var(--color-primary);
  background: var(--color-border-light);
  outline: none;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-current {
  color: var(--color-primary);
  font-weight: 500;
}

.main-content {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  min-height: 60vh;
}

.main-article {
  max-width: var(--max-content);
}

.main-centered {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
}

.hero {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
  max-width: 640px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

.page-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.page-desc {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

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

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.article-card {
  background: var(--color-surface);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow 150ms, transform 150ms;
}

.article-card:hover {
  box-shadow: 0 4px 20px rgba(42, 33, 24, 0.08);
  transform: translateY(-2px);
}

.card-cover {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.card-body { padding: var(--space-md); }

.card-title {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: var(--space-xs);
}

.card-title a {
  color: var(--color-text);
  text-decoration: none;
}

.card-title a:hover, .card-title a:focus {
  color: var(--color-primary);
}

.card-title a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-list { display: flex; flex-direction: column; gap: var(--space-lg); }

.list-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  align-items: flex-start;
}

.list-cover {
  width: 120px;
  height: 90px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}

.list-body { flex: 1; min-width: 0; }

.list-title {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: var(--space-xs);
}

.list-title a {
  color: var(--color-text);
  text-decoration: none;
}

.list-title a:hover, .list-title a:focus { color: var(--color-primary); }

.list-title a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.list-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

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

.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.author-trait {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-top: var(--space-xs);
}

.article-single { max-width: var(--max-content); margin: 0 auto; }

.article-header { margin-bottom: var(--space-lg); }

.article-title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  align-items: center;
}

.meta-author { font-weight: 500; }

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

.meta-tags a, .meta-tags span {
  padding: 2px 10px;
  background: var(--color-border-light);
  border-radius: 12px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.meta-tags a:hover, .meta-tags a:focus {
  background: var(--color-primary);
  color: #fff;
}

.meta-tags a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.article-cover {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: var(--space-lg);
}

.article-body {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-text);
}

.article-body > * + * { margin-top: var(--space-md); }

.article-body h2 {
  font-size: 1.375rem;
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

.article-body p { margin-bottom: var(--space-md); }

.article-body ul, .article-body ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.article-body li { margin-bottom: var(--space-xs); }

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}

.article-body blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-md);
  color: var(--color-text-secondary);
  font-style: italic;
}

.article-body pre {
  background: #F5F2EE;
  padding: var(--space-md);
  border-radius: 6px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: #F5F2EE;
  padding: 2px 6px;
  border-radius: 3px;
}

.article-body pre code { background: none; padding: 0; }

.article-actions { margin-top: var(--space-xl); padding-top: var(--space-lg); border-top: 1px solid var(--color-border); }

.action-link {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background 150ms;
}

.action-link:hover, .action-link:focus { background: var(--color-primary-hover); }

.action-link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.comment-list { display: flex; flex-direction: column; gap: var(--space-lg); }

.comment-item {
  padding: var(--space-md);
  background: var(--color-surface);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.comment-head {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.comment-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.comment-meta { display: flex; flex-direction: column; gap: 2px; }

.comment-author { font-weight: 600; font-size: 0.9375rem; }

.comment-time { font-size: 0.8125rem; color: var(--color-text-muted); }

.comment-body {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text);
  white-space: pre-wrap;
}

.comment-index { display: flex; flex-direction: column; gap: var(--space-sm); }

.index-item { padding: var(--space-sm) 0; border-bottom: 1px solid var(--color-border-light); }

.index-link {
  color: var(--color-text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
}

.index-link:hover, .index-link:focus { color: var(--color-primary); }

.index-link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

.back-link {
  display: inline-block;
  margin-top: var(--space-sm);
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.9375rem;
}

.back-link:hover, .back-link:focus { text-decoration: underline; }

.pagination {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.page-link {
  padding: var(--space-xs) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: background 150ms, border-color 150ms;
}

.page-link:hover, .page-link:focus {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.page-link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  color: var(--color-text-muted);
}

.empty-state p { font-size: 1rem; }

.error-page { text-align: center; padding: var(--space-2xl) var(--space-lg); }

.error-code {
  font-size: clamp(4rem, 10vw, 6rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-md);
  opacity: 0.6;
}

.error-desc {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.error-hint {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.error-action {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  transition: background 150ms;
}

.error-action:hover, .error-action:focus { background: var(--color-primary-hover); }

.error-action:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

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

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
}

.footer-link:hover, .footer-link:focus { color: var(--color-primary); }

.footer-link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

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

@media (max-width: 640px) {
  .header-inner { padding: var(--space-sm) var(--space-md); gap: var(--space-sm); }
  .site-nav { gap: var(--space-xs); }
  .nav-link { padding: var(--space-xs) var(--space-sm); font-size: 0.875rem; }
  .main-content { padding: var(--space-lg) var(--space-md); }
  .hero { padding: var(--space-xl) 0 var(--space-lg); }
  .article-grid { grid-template-columns: 1fr; }
  .list-item { flex-direction: column; gap: var(--space-sm); }
  .list-cover { width: 100%; height: 160px; }
  .author-profile { flex-direction: column; text-align: center; }
  .article-meta { gap: var(--space-xs); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .article-card, .action-link, .page-link, .error-action { transition: none; }
}