/* 内容建站中台 - 默认主题样式 */
:root {
  --primary: #2563eb;
  --text: #1f2937;
  --muted: #6b7280;
  --bg: #f6f7f9;
  --card-bg: #fff;
  --border: #e5e7eb;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }

/* 头部 */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 12px;
  padding-bottom: 12px;
}
.logo { display: flex; flex-direction: column; line-height: 1.3; }
.logo strong { font-size: 20px; color: var(--text); }
.logo .slogan { font-size: 12px; color: var(--muted); }
.main-nav { display: flex; gap: 16px; flex: 1; }
.main-nav a { color: var(--text); font-size: 15px; }
.main-nav a:hover { color: var(--primary); text-decoration: none; }
.lang-nav { display: flex; gap: 8px; }
.lang-nav a {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
}
.lang-nav a.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.lang-nav a:hover { text-decoration: none; border-color: var(--primary); }

.site-main { padding: 24px 16px 48px; }

/* 列表卡片 */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .15s;
}
.card:hover { box-shadow: 0 6px 20px rgba(0,0,0,.08); }
.card-thumb { display: block; aspect-ratio: 16/9; overflow: hidden; background: #eef; }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 14px 16px 16px; }
.card-meta { display: flex; align-items: center; gap: 10px; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.tag {
  background: #eff6ff;
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
}
.card-title { margin: 0 0 6px; font-size: 17px; line-height: 1.4; }
.card-title a { color: var(--text); }
.card-title a:hover { color: var(--primary); text-decoration: none; }
.card-desc { margin: 0; font-size: 13px; color: var(--muted); }

/* 分页 */
.pagination { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 28px; }
.pagination a {
  border: 1px solid var(--border);
  background: #fff;
  padding: 6px 14px;
  border-radius: 6px;
  color: var(--text);
}
.page-info { color: var(--muted); font-size: 14px; }

/* 文章详情 */
.post {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.post-meta { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--muted); }
.post-title { font-size: 28px; line-height: 1.35; margin: 12px 0 0; }
.post-hero { margin: 20px 0; border-radius: var(--radius); overflow: hidden; }
.post-content { font-size: 16px; }
.post-content h2 { margin-top: 28px; }
.post-content p { margin: 12px 0; }
.post-content img { border-radius: 8px; }
.post-source { margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; word-break: break-all; }
.post-foot { margin-top: 24px; }

.page-heading { margin: 8px 0 4px; }
.cat-desc { color: var(--muted); margin-top: 0; }

/* SEO 辅助：面包屑 / 上一篇下一篇 / 视觉隐藏 h1 */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0; overflow: hidden; clip: rect(0 0 0 0);
}
.breadcrumb { font-size: 13px; color: var(--muted); margin: 0 0 14px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); text-decoration: none; }
.breadcrumb span { color: var(--text); }
.post-nav { display: flex; gap: 12px; justify-content: space-between; flex-wrap: wrap; margin-bottom: 12px; }
.post-nav-item { font-size: 14px; }

/* 作者 */
.author-line { display: inline-flex; align-items: center; gap: 4px; }
.author-card {
  display: flex; gap: 20px; align-items: flex-start;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 24px;
}
.author-photo { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.author-name { margin: 0 0 6px; font-size: 22px; }
.author-bio { margin: 0 0 10px; color: var(--muted); }
.author-socials { display: flex; gap: 8px; flex-wrap: wrap; }
@media (max-width: 640px) { .author-card { flex-direction: column; } }

/* 空状态 */
.empty-box { text-align: center; padding: 60px 20px; background: #fff; border: 1px dashed var(--border); border-radius: var(--radius); }
.big-404 { font-size: 64px; margin: 0; color: var(--muted); }
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 8px 18px;
  border-radius: 6px;
}
.btn:hover { text-decoration: none; opacity: .9; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); background: #fff; padding: 20px 0; margin-top: 20px; }
.site-footer p { margin: 2px 0; font-size: 13px; }
.muted { color: var(--muted); }

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .main-nav { flex-wrap: wrap; }
  .post { padding: 18px; }
}

/* 首页多语种标题区（hero） */
.home-hero { text-align: center; padding: 36px 20px 26px; }
.home-hero-title { margin: 0 0 8px; font-size: 34px; line-height: 1.3; }
.home-hero-sub { margin: 0; color: var(--muted); font-size: 16px; }

/* 点赞交互 */
.like-wrap { display: inline-flex; align-items: center; }
.like-btn {
  display: inline-flex; align-items: center; gap: 4px;
  border: 1px solid var(--border); background: #fff; color: var(--muted);
  padding: 3px 12px; border-radius: 999px; cursor: pointer; font-size: 14px;
  transition: all .15s;
}
.like-btn:hover { border-color: #f87171; color: #dc2626; }
.like-btn.liked { background: #fef2f2; border-color: #f87171; color: #dc2626; }