:root {
  --primary: #6366f1;
  --primary-light: #eef2ff;
  --primary-dark: #4f46e5;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text2: #64748b;
  --text3: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --accent: #f59e0b;
  --green: #10b981;
  --green-light: #ecfdf5;
  --red: #ef4444;
  --red-light: #fef2f2;
  --shadow: 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.1);
  --radius: 12px;
  --radius-sm: 8px;
}
* { 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; -webkit-font-smoothing: antialiased;
}
a { color: var(--text); text-decoration: none; }

.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px; flex-shrink: 0; background: var(--card-bg);
  border-right: 1px solid var(--border); padding: 16px 0;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.sidebar .brand {
  padding: 4px 20px 16px; font-size: 1.2rem; font-weight: 800;
  color: var(--primary-dark); letter-spacing: 1px;
}
.sidebar .cat-item {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 20px; font-size: 0.85rem; color: var(--text2);
  border-left: 3px solid transparent; transition: all .15s;
}
.sidebar .cat-item:hover { background: var(--primary-light); color: var(--primary-dark); }
.sidebar .cat-item.active {
  color: var(--primary); background: var(--primary-light);
  border-left-color: var(--primary); font-weight: 600;
}
.sidebar .cat-item .count, .sidebar .cat-item .badge {
  margin-left: auto; font-size: 0.7rem; background: var(--border-light);
  padding: 2px 8px; border-radius: 10px; color: var(--text2);
}
.sidebar .cat-item.active .count, .sidebar .cat-item.active .badge {
  background: var(--primary); color: #fff;
}

.main { flex: 1; padding: 28px 32px 60px; min-width: 0; max-width: 1000px; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 20px; border-bottom: 1px solid var(--border); margin-bottom: 24px;
}
.topbar h1 { font-size: 1.5rem; font-weight: 700; }
.topbar .stats { display: flex; gap: 12px; align-items: center; }
.topbar .stat {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 72px; height: 72px;
  background: #fff; border: 1px solid var(--border); border-radius: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
  transition: all .2s;
}
.topbar .stat:hover { border-color: var(--primary); box-shadow: 0 2px 8px rgba(99,102,241,.1); }
.topbar .stat .num { font-size: 1.5rem; font-weight: 800; color: var(--primary); line-height: 1; }
.topbar .stat .label { font-size: 0.65rem; color: var(--text3); margin-top: 2px; }
.submit-link {
  display: flex; align-items: center; gap: 6px;
  height: 72px; padding: 0 24px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6); color: #fff;
  border-radius: 16px;
  font-size: 0.9rem; font-weight: 700;
  box-shadow: 0 4px 14px rgba(99,102,241,.3);
  transition: all .25s;
}
.submit-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99,102,241,.4);
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
}

.search-bar { max-width: 480px; margin-bottom: 24px; }
.search-bar form { display: flex; }
.search-bar input {
  flex: 1; padding: 10px 16px; font-size: 0.9rem;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--card-bg); color: var(--text); outline: none;
}
.search-bar input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99,102,241,.12); }
.search-bar button {
  padding: 10px 20px; background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius-sm); margin-left: 8px;
  font-weight: 600; cursor: pointer; font-size: 0.9rem;
}

.cat-section { margin-bottom: 36px; }
.cat-header { margin-bottom: 14px; }
.cat-header-top { display: flex; align-items: center; gap: 8px; }
.cat-header h2 { font-size: 1.2rem; font-weight: 700; }
.cat-header-sub { display: flex; align-items: center; gap: 16px; margin-top: 6px; }
.cat-header .count { font-size: 0.8rem; color: var(--text3); }
.cat-header .count strong { color: var(--primary); font-weight: 600; }
.cat-header .view-all {
  font-size: 0.85rem; color: var(--primary); font-weight: 500;
}
.cat-header .view-all:hover { color: var(--primary-dark); }

.site-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.site-card {
  display: flex; flex-direction: column; padding: 16px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); gap: 10px;
  transition: all .2s; position: relative; overflow: hidden;
}
.site-card:hover {
  border-color: var(--primary); box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.site-card .top { display: flex; align-items: flex-start; gap: 10px; }
.site-card .favicon {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--border-light); overflow: hidden; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.site-card .favicon img { width: 100%; height: 100%; object-fit: contain; }
.site-card .info { flex: 1; min-width: 0; }
.site-card .name { font-size: 0.88rem; font-weight: 600; color: var(--text); }
.site-card .name:hover { color: var(--primary); }
.site-card .domain { font-size: 0.7rem; color: var(--text3); margin-top: 1px; }
.site-card .desc {
  font-size: 0.78rem; color: var(--text2); line-height: 1.45;
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
}
.site-card .bottom { display: flex; align-items: center; justify-content: space-between; font-size: 0.75rem; }
.site-card .tag {
  padding: 2px 8px; font-size: 0.7rem; border-radius: 10px;
  background: var(--border-light); color: var(--text2);
}
.site-card .goto { color: var(--primary); font-weight: 600; font-size: 0.78rem; }
.site-card .goto:hover { color: var(--primary-dark); }
.site-card .card-link { position: absolute; inset: 0; z-index: 2; }

.friends {
  margin-top: 32px; padding: 14px 18px;
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); font-size: 0.85rem; color: var(--text2); text-align: center;
}
.friends a { color: var(--primary); margin: 0 4px; }
.friends a:hover { color: var(--primary-dark); }

.footer {
  margin-top: 24px; padding: 24px; background: var(--card-bg);
  border-top: 1px solid var(--border); text-align: center;
  font-size: 0.8rem; color: var(--text3); border-radius: var(--radius) var(--radius) 0 0;
}
.footer a { color: var(--primary); }

.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; padding: 24px 0; }
.page-btn {
  padding: 8px 18px; background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 0.85rem;
}
.page-btn:hover { border-color: var(--primary); color: var(--primary); }
.page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-info { font-size: 0.8rem; color: var(--text2); }

.detail { max-width: 800px; margin: 0 auto; padding: 30px 20px 60px; }
.detail-hero {
  padding: 40px; background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 24px; text-align: center;
}
.detail-hero .favicon { width: 64px; height: 64px; border-radius: 14px; margin: 0 auto 16px; }
.detail-hero h1 { font-size: 1.5rem; }
.detail-hero .domain { color: var(--primary); font-size: 0.85rem; margin: 8px 0; }
.detail-hero .desc { color: var(--text2); font-size: 0.9rem; }
.detail-section {
  padding: 24px; background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 16px;
}
.detail-section h2 { font-size: 1.1rem; margin-bottom: 12px; }
.breadcrumb { padding: 8px 0 16px; font-size: 0.8rem; color: var(--text3); }
.breadcrumb a { color: var(--primary); }
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }

.error-code { font-size: 6rem; font-weight: 800; color: var(--primary); line-height: 1; }
.error-msg { font-size: 1.1rem; color: var(--text2); margin: 12px 0 24px; }
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }

@media (max-width: 900px) {
  .sidebar { width: 170px; }
  .main { padding: 20px 16px; }
  .site-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}
@media (max-width: 700px) {
  .layout { flex-direction: column; }
  .sidebar { display: none; }
  .main { padding: 14px 12px 40px; }
  .topbar { flex-wrap: wrap; gap: 8px; justify-content: center; padding-bottom: 14px; margin-bottom: 16px; }
  .topbar h1 { font-size: 1.15rem; }
  .topbar .stat { padding: 6px 10px; gap: 4px; }
  .topbar .stat .num { font-size: 1rem; }
  .submit-link { padding: 7px 14px; font-size: 0.8rem; }
  .site-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .site-card { padding: 12px; border-radius: var(--radius-sm); gap: 8px; }
  .site-card .favicon { width: 28px; height: 28px; border-radius: 6px; }
  .site-card .name { font-size: 0.82rem; }
  .site-card .desc { font-size: 0.73rem; }
  .site-card .domain { font-size: 0.68rem; }
  .site-card .tag { font-size: 0.65rem; }
  .cat-header h2 { font-size: 1rem; }
  .cat-header .view-all { font-size: 0.8rem; }
  .friends { padding: 10px; font-size: 0.8rem; }
  .footer { padding: 16px 12px; font-size: 0.75rem; }
  .detail { padding: 16px 12px 40px; }
  .detail-hero { padding: 24px 14px; border-radius: var(--radius-sm); }
  .detail-hero h1 { font-size: 1.2rem; }
  .detail-section { padding: 16px 14px; }
  .related-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .cat-grid { grid-template-columns: 1fr 1fr; }
  .tool-grid, .news-grid { grid-template-columns: 1fr; }
  .pagination { gap: 8px; }
  .page-btn { padding: 6px 12px; font-size: 0.8rem; }
}
@media (max-width: 400px) {
  .site-grid { grid-template-columns: 1fr 1fr; gap: 6px; }
  .site-card { padding: 10px; gap: 6px; }
  .site-card .name { font-size: 0.78rem; }
  .site-card .desc { font-size: 0.7rem; }
}