:root {
  --bg: #0b1020;
  --bg-soft: #111833;
  --card: rgba(255, 255, 255, 0.04);
  --card-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --text: #e8ecf8;
  --text-soft: #9aa3bf;
  --text-faint: #6b7391;
  --accent: #6c8cff;
  --accent-2: #38d9a9;
  --accent-grad: linear-gradient(135deg, #6c8cff 0%, #38d9a9 100%);
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  --maxw: 1180px;
}

[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --card: rgba(17, 24, 51, 0.035);
  --card-hover: rgba(17, 24, 51, 0.07);
  --border: rgba(17, 24, 51, 0.1);
  --text: #1c2340;
  --text-soft: #4d5678;
  --text-faint: #8a92ad;
  --shadow: 0 10px 30px rgba(30, 40, 90, 0.08);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; position: relative; z-index: 1; }

.bg-circle {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
}
.bg-circle-1 { width: 480px; height: 480px; background: #6c8cff; top: -160px; right: -120px; }
.bg-circle-2 { width: 420px; height: 420px; background: #38d9a9; bottom: -140px; left: -140px; opacity: 0.22; }

/* ===== Header ===== */
.site-header { padding: 18px 0; }
.header-inner {
  display: flex; align-items: center; gap: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 18px;
  backdrop-filter: blur(12px);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; font-size: 1.15rem; }
.brand:hover { text-decoration: none; }
.logo-mark svg { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.header-nav { display: flex; gap: 4px; flex: 1; }
.header-nav a {
  color: var(--text-soft); padding: 6px 12px; border-radius: 8px; font-size: 0.95rem;
  transition: all 0.2s;
}
.header-nav a:hover { color: var(--text); background: var(--card-hover); text-decoration: none; }
.header-nav a.active { color: var(--text); background: var(--card-hover); }
.header-tools { display: flex; gap: 10px; align-items: center; }
.theme-btn, .action-btn {
  border: 1px solid var(--border); border-radius: 9px; padding: 7px 14px;
  font-size: 0.88rem; cursor: pointer; background: var(--card); color: var(--text);
  transition: all 0.2s; display: inline-block; white-space: nowrap;
}
.theme-btn:hover, .action-btn:hover { background: var(--card-hover); text-decoration: none; }
.action-primary { background: var(--accent-grad); color: #fff; border: none; font-weight: 600; }
.action-primary:hover { filter: brightness(1.08); }

/* ===== Hero ===== */
.hero { text-align: center; padding: 64px 0 40px; }
.badge {
  display: inline-block; font-size: 0.72rem; letter-spacing: 0.28em; color: var(--accent-2);
  border: 1px solid var(--border); border-radius: 999px; padding: 4px 14px; margin-bottom: 18px;
  background: var(--card);
}
.hero h1 { font-size: 3rem; letter-spacing: 0.04em; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero-subtitle { color: var(--text-soft); font-size: 1.1rem; margin-top: 10px; }
.hero-note { color: var(--text-faint); font-size: 0.85rem; margin-top: 18px; }
.hero-search { max-width: 560px; margin: 28px auto 0; }
.search-box {
  display: flex; align-items: center; gap: 10px;
  background: var(--card); border: 1px solid var(--border); border-radius: 999px;
  padding: 12px 20px; transition: border-color 0.2s, box-shadow 0.2s;
}
.search-box:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108, 140, 255, 0.18); }
.search-box svg { width: 18px; height: 18px; fill: none; stroke: var(--text-faint); stroke-width: 2; flex-shrink: 0; }
.search-box input {
  flex: 1; background: none; border: none; outline: none; color: var(--text); font-size: 0.98rem;
}
.search-box input::placeholder { color: var(--text-faint); }
.hero-stats { display: flex; justify-content: center; gap: 48px; margin-top: 32px; }
.stat { display: flex; flex-direction: column; }
.stat span { font-size: 1.9rem; font-weight: 700; color: var(--text); }
.stat small { color: var(--text-faint); font-size: 0.82rem; }

/* ===== Category bar ===== */
.category-bar { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; padding: 10px 0 30px; }
.category-pill {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 999px; padding: 8px 16px; font-size: 0.92rem; transition: all 0.2s;
}
.category-pill:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.category-pill em { font-style: normal; color: var(--text-faint); font-size: 0.8rem; margin-left: 4px; }

/* ===== Category sections ===== */
.category-section { margin-bottom: 48px; scroll-margin-top: 20px; }
.category-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 18px; }
.category-title { font-size: 1.5rem; display: flex; align-items: center; gap: 10px; }
.category-icon { font-size: 1.3rem; }
.category-desc { color: var(--text-soft); font-size: 0.95rem; flex: 1; min-width: 220px; }
.category-more { font-size: 0.85rem; color: var(--accent-2); white-space: nowrap; }

.site-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }

/* ===== Site card ===== */
.site-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; display: flex; flex-direction: column; gap: 10px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
.site-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: var(--shadow); background: var(--card-hover); }
.site-card-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.site-card-title { font-size: 1.08rem; }
.site-card-title a { color: var(--text); }
.site-card-title a:hover { color: var(--accent); text-decoration: none; }
.site-card-link {
  width: 30px; height: 30px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); color: var(--text-soft); font-size: 0.95rem; flex-shrink: 0;
  transition: all 0.2s;
}
.site-card-link:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.site-card-desc { color: var(--text-soft); font-size: 0.92rem; }
.site-card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 0.76rem; color: var(--text-soft); background: var(--card-hover);
  border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; white-space: nowrap;
}
.tag-link:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.tag-muted { color: var(--text-faint); }
.site-card-review { font-size: 0.85rem; color: var(--accent-2); margin-top: auto; padding-top: 6px; }
.site-card-review:hover { text-decoration: underline; }

/* ===== Single page ===== */
.single-page { padding: 30px 0 60px; }
.breadcrumb { font-size: 0.85rem; color: var(--text-faint); margin-bottom: 26px; }
.breadcrumb a { color: var(--text-soft); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .crumb-current { color: var(--text-faint); }
.single-hero { padding: 30px 34px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); margin-bottom: 26px; }
.single-hero:not(.site-hero) { max-width: 860px; margin-left: auto; margin-right: auto; }
.site-hero { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; flex-wrap: wrap; }
.single-title { font-size: 1.8rem; margin-bottom: 10px; }
.single-desc { color: var(--text-soft); font-size: 1.02rem; }
.site-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; align-items: center; }
.single-hero-actions { display: flex; align-items: center; gap: 12px; }
.single-body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 26px; align-items: start; }
.single-content { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 34px; }
.single-content-full { max-width: 860px; margin-left: auto; margin-right: auto; }
.single-content h2 { font-size: 1.35rem; margin: 28px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.single-content h3 { font-size: 1.12rem; margin: 22px 0 10px; }
.single-content p { margin-bottom: 14px; color: var(--text); }
.single-content ul, .single-content ol { margin: 0 0 14px 22px; }
.single-content li { margin-bottom: 6px; color: var(--text-soft); }
.single-content blockquote {
  border-left: 3px solid var(--accent); background: var(--card-hover); padding: 10px 16px;
  margin: 14px 0; border-radius: 0 8px 8px 0; color: var(--text-soft);
}
.single-content table { width: 100%; border-collapse: collapse; margin: 14px 0; }
.single-content th, .single-content td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.single-content th { background: var(--card-hover); }
.single-content code { background: var(--card-hover); border-radius: 5px; padding: 2px 7px; font-size: 0.9em; }

/* ===== Aside ===== */
.aside-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 18px; }
.aside-card h3 { font-size: 1rem; margin-bottom: 12px; }
.meta-list { display: grid; grid-template-columns: 56px 1fr; gap: 8px 12px; font-size: 0.9rem; }
.meta-list dt { color: var(--text-faint); }
.meta-list dd { color: var(--text); word-break: break-all; }
.aside-note { font-size: 0.82rem; color: var(--text-faint); margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--border); }
.related-list { list-style: none; margin-left: 0; }
.related-list li { margin-bottom: 8px; font-size: 0.92rem; }

/* ===== Category index (taxonomy list) ===== */
.cat-index-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; padding-bottom: 30px; }
.cat-index-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; display: flex; flex-direction: column; gap: 6px; color: var(--text);
  transition: all 0.2s;
}
.cat-index-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); text-decoration: none; }
.cat-index-icon { font-size: 1.6rem; }
.cat-index-name { font-size: 1.1rem; font-weight: 600; }
.cat-index-count { font-size: 0.8rem; color: var(--accent-2); }
.cat-index-desc { font-size: 0.88rem; color: var(--text-soft); }

/* ===== List pages ===== */
.list-page { padding: 30px 0 60px; }
.list-hero { text-align: center; padding: 30px 0 36px; }
.list-title { font-size: 2rem; margin-bottom: 10px; }
.list-desc { color: var(--text-soft); max-width: 640px; margin: 0 auto; }
.category-intro { margin-bottom: 30px; }
.blog-list { display: flex; flex-direction: column; gap: 16px; }
.blog-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 26px; transition: all 0.2s; }
.blog-item:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.blog-item-title { font-size: 1.2rem; }
.blog-item-title a { color: var(--text); }
.blog-item-title a:hover { color: var(--accent); }
.blog-item-meta { font-size: 0.82rem; color: var(--text-faint); margin: 4px 0 8px; }
.blog-item-desc { color: var(--text-soft); font-size: 0.94rem; }

/* ===== Home extra ===== */
.home-extra { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-bottom: 50px; }
.home-extra-col { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 28px; }
.home-extra-col h2 { font-size: 1.15rem; margin-bottom: 14px; }
.article-list { list-style: none; margin-left: 0; }
.article-list li { margin-bottom: 10px; display: flex; justify-content: space-between; gap: 12px; }
.article-list a { color: var(--text-soft); font-size: 0.94rem; }
.article-list a:hover { color: var(--accent); }
.article-date { color: var(--text-faint); font-size: 0.8rem; white-space: nowrap; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border); margin-top: 20px; padding: 40px 0 24px;
  background: var(--bg-soft);
}
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding: 0 24px; }
.footer-brand { font-weight: 700; font-size: 1.05rem; color: var(--text); margin-bottom: 10px; }
.footer-desc { color: var(--text-faint); font-size: 0.88rem; max-width: 380px; }
.footer-title { font-size: 0.95rem; color: var(--text); margin-bottom: 12px; }
.footer-links { list-style: none; margin-left: 0; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: var(--text-soft); font-size: 0.9rem; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 30px; padding-top: 18px; text-align: center; color: var(--text-faint); font-size: 0.82rem; }

/* ===== Back to top ===== */
.back-to-top {
  position: fixed; right: 24px; bottom: 24px; width: 42px; height: 42px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--card); color: var(--text); font-size: 1.1rem;
  cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(8px); transition: all 0.25s; z-index: 50;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .header-nav { display: none; }
  .header-tools .action-btn { display: none; }
  .hero h1 { font-size: 2.3rem; }
  .single-body { grid-template-columns: 1fr; }
  .home-extra { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 20px; }
  .site-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
}