:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --primary: #4f6ef7;
  --primary-dark: #3b57d6;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(31, 36, 48, .06);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }
.container { width: min(760px, 94%); margin: 0 auto; }

/* 头部 */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 50px; }
.site-title { font-size: 16px; font-weight: 700; color: var(--text); text-decoration: none; }
.site-nav { display: flex; gap: 14px; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 13px; transition: color .15s; }
.site-nav a:hover { color: var(--primary); }

/* Hero */
.hero { text-align: center; padding: 30px 0 14px; }
.hero h1 { font-size: clamp(19px, 5vw, 26px); letter-spacing: .3px; }
.hero-sub { color: var(--muted); font-size: 13px; margin: 6px 0 16px; }
.search {
  width: min(440px, 100%);
  padding: 9px 16px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.search:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 110, 247, .12); }

/* 分类筛选 */
.chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-top: 10px; }
.chip {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  transition: all .15s;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* 卡片：紧凑列表式 */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  padding: 12px 0 40px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform .15s, box-shadow .15s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(31, 36, 48, .1); }
.card:active { transform: scale(.985); }
.card-icon { margin-right: 6px; font-size: 15px; }
.card-media { position: relative; display: block; aspect-ratio: 16 / 9; background: #eef1ff; overflow: hidden; text-decoration: none; }
.card-media img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .3s; }
.card:hover .card-media img { transform: scale(1.05); }
.card-cat {
  position: absolute; top: 8px; left: 8px;
  background: rgba(31, 36, 48, .72);
  color: #fff;
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 999px;
}
.card-body { padding: 12px 14px 10px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card-title { font-size: 15px; line-height: 1.4; }
.card-title a { color: var(--text); text-decoration: none; }
.card-title a:hover { color: var(--primary); }
.card-desc {
  color: var(--muted);
  font-size: 13px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.tag { font-size: 11px; color: var(--primary); background: rgba(79, 110, 247, .1); padding: 1px 8px; border-radius: 999px; }
.card-foot { margin-top: auto; display: flex; justify-content: space-between; align-items: center; padding-top: 6px; }
.card-foot time { font-size: 12px; color: var(--muted); }
.card-link { font-size: 13px; color: var(--primary); font-weight: 600; text-decoration: none; }
.card-link:hover { color: var(--primary-dark); }

.empty { text-align: center; color: var(--muted); padding: 50px 0 70px; }

/* 详情页 */
.post { max-width: 680px; padding: 30px 0 60px; }
.back { color: var(--muted); text-decoration: none; font-size: 13px; }
.back:hover { color: var(--primary); }
.post-head { margin: 18px 0; }
.post-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; color: var(--muted); font-size: 12.5px; margin-bottom: 10px; }
.chip-static { background: rgba(79, 110, 247, .1); color: var(--primary); padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.post h1 { font-size: clamp(21px, 4vw, 28px); line-height: 1.35; }
.post-summary { color: var(--muted); margin-top: 10px; font-size: 14.5px; }
.post-cover { width: 100%; border-radius: var(--radius); margin: 8px 0 18px; box-shadow: var(--shadow); }
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: 9px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  margin: 4px 0 18px;
  transition: background .15s;
}
.btn:hover { background: var(--primary-dark); }
.post-content { color: #333a47; }
.post-content p { margin: 12px 0; }
.post-content img { max-width: 100%; border-radius: 8px; }
.post-content a { color: var(--primary); }
.post-content h1, .post-content h2, .post-content h3 { margin: 22px 0 8px; }
.post-content ul, .post-content ol { padding-left: 20px; margin: 10px 0; }
.post-content blockquote { border-left: 3px solid var(--primary); background: rgba(79, 110, 247, .06); padding: 8px 14px; border-radius: 0 8px 8px 0; margin: 12px 0; }
.post-content code { background: #eef1f6; padding: 2px 5px; border-radius: 4px; font-size: .9em; }
.post-content pre { background: #1f2430; color: #e5e7eb; padding: 14px; border-radius: 8px; overflow-x: auto; margin: 12px 0; }
.post-content pre code { background: none; padding: 0; }

.page-title { padding-top: 30px; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); padding: 18px 0; text-align: center; color: var(--muted); font-size: 12px; }

@media (max-width: 560px) {
  .hero { padding: 22px 0 10px; }
  .hero-sub { margin-bottom: 12px; }
  .grid { grid-template-columns: 1fr; gap: 10px; }
  .card-body { padding: 11px 13px 9px; }
}