:root {
  --primary: #4f46e5;
  --accent: #f59e0b;
  --bg: #0f1117;
  --card: #1a1d27;
  --card2: #222635;
  --text: #e7e9f0;
  --muted: #9aa1b2;
  --border: #2c3142;
  --ok: #22c55e;
  --danger: #ef4444;
  --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh;
}
body[data-mode="light"] { --bg:#f5f6fa; --card:#ffffff; --card2:#f0f2f8; --text:#1a1d27; --muted:#6b7280; --border:#e2e6f0; }
a { color: var(--primary); text-decoration: none; }
code { background: var(--card2); padding: 2px 6px; border-radius: 6px; font-size: .85em; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 17px; color: var(--text); }
.brand-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 12px var(--primary); }
.main-nav { display: flex; gap: 4px; flex: 1; }
.main-nav a { padding: 8px 14px; border-radius: 8px; color: var(--muted); font-size: 14px; }
.main-nav a:hover, .main-nav a.active { color: var(--text); background: var(--card2); }
.lang-switch { display: flex; gap: 6px; align-items: center; }
.lang-switch a { padding: 5px 10px; border-radius: 8px; color: var(--muted); font-size: 13px; }
.lang-switch a.active { background: var(--primary); color: #fff; }

/* ---------- 主区 ---------- */
main.wrap { padding: 28px 0 60px; min-height: 70vh; }
.hero { text-align: center; padding: 40px 0 28px; }
.hero h1 { font-size: 32px; background: linear-gradient(120deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); margin-top: 8px; }

/* ---------- 分类导航（胶囊） ---------- */
.cat-nav { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 14px; }
.cat-nav a { padding: 7px 16px; border-radius: 99px; border: 1px solid var(--border); color: var(--muted); font-size: 13.5px; }
.cat-nav a:hover, .cat-nav a.active { background: var(--primary); color: #fff; border-color: transparent; }
.breadcrumb { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; font-size: 13.5px; color: var(--muted); margin: 12px 0 2px; }
.breadcrumb a { color: var(--muted); padding: 3px 8px; border-radius: 6px; }
.breadcrumb a:hover { color: var(--primary); background: var(--card2); }
.breadcrumb b { color: var(--text); padding: 3px 8px; }
.breadcrumb .bc-sep { color: var(--border); }
.cat-title { font-size: 22px; margin: 8px 0 4px; }

/* ---------- 文章卡片网格 ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin-top: 16px; }
.post-card { display: block; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; transition: .15s; color: var(--text); }
.post-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.post-card h3 { font-size: 16px; margin-top: 8px; line-height: 1.4; }
.post-card h3 a { color: var(--text); }
.post-card h3 a:hover { color: var(--primary); }
.post-card .card-desc { color: var(--muted); font-size: 13px; margin-top: 6px; }
.post-card .card-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; color: var(--muted); font-size: 12px; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: 12px; background: var(--card2); color: var(--muted); border: 1px solid var(--border); }
.badge-primary { background: color-mix(in srgb, var(--primary) 18%, transparent); color: var(--primary); border-color: transparent; }

/* ---------- 文章详情 ---------- */
.article { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 30px; }
.post-title { font-size: 26px; line-height: 1.35; margin-bottom: 8px; }
.post-meta { display: flex; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: 13px; margin-bottom: 18px; }
.post-body { margin-top: 16px; font-size: 16px; line-height: 1.8; white-space: pre-wrap; }
.post-body img { max-width: 100%; border-radius: 8px; }
.comment { border-left: 3px solid var(--border); padding: 10px 14px; margin-bottom: 10px; background: var(--card2); border-radius: 0 10px 10px 0; }

/* ---------- 通用 ---------- */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px; border-radius: 10px; border: 1px solid var(--border); background: var(--primary); color: #fff; font-size: 14px; cursor: pointer; transition: .15s; }
.btn:hover { filter: brightness(1.12); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn-ghost { background: transparent; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.card h3 { font-size: 16px; margin-bottom: 6px; }
.muted { color: var(--muted); font-size: 13px; }
.row { display: flex; align-items: center; gap: 12px; }
.between { justify-content: space-between; }
.pager { margin-top: 18px; display: flex; gap: 10px; align-items: center; }
.pager .btn:disabled { opacity: .4; cursor: not-allowed; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }
.loading { text-align: center; color: var(--muted); padding: 30px 0; }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0 30px; color: var(--muted); font-size: 13px; }
.back { margin-top: 18px; display: inline-block; }

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 24px; }
  .main-nav { gap: 0; }
  .main-nav a { padding: 8px 10px; font-size: 13px; }
}