:root {
  --bg: #f1f5f9;
  --card-bg: #fff;
  --text: #0f172a;
  --text2: #475569;
  --text3: #94a3b8;
  --primary: #3b82f6;
  --primary-light: #eff6ff;
  --primary-dark: #2563eb;
  --primary-gradient: linear-gradient(135deg, #3b82f6, #6366f1);
  --accent: #f59e0b;
  --accent-light: #fffbeb;
  --green: #10b981;
  --green-light: #ecfdf5;
  --red: #ef4444;
  --red-light: #fef2f2;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
* { margin:0; padding:0; box-sizing:border-box; }
body { 
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif; 
  background:var(--bg); color:var(--text); min-height:100vh; 
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  background-image: 
    radial-gradient(ellipse at 0% 0%, rgba(59,130,246,0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 100% 100%, rgba(99,102,241,0.02) 0%, transparent 50%);
}
a { text-decoration:none; color:inherit; }

/* ── TOPBAR ── */
.topbar {
  background: rgba(255,255,255,0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 28px; height: 60px; display: flex; align-items: center;
  position: sticky; top: 0; z-index: 100; gap: 24px; 
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}
.topbar .logo { 
  font-size: 1.3rem; font-weight: 800; color: var(--primary); 
  letter-spacing: -0.5px; white-space: nowrap;
  display: flex; align-items: center; gap: 6px;
}
.topbar .logo::before { content:'🌐'; font-size:1.2rem; }
.topbar .logo span { color: var(--text); font-weight: 400; opacity: 0.5; }

.topbar .search-box { flex: 1; max-width: 440px; position: relative; }
.topbar .search-box input {
  width: 100%; padding: 9px 16px 9px 40px; border: 1.5px solid var(--border);
  border-radius: 24px; font-size: 0.88rem; outline: none; background: var(--bg);
  transition: all var(--transition); color: var(--text);
}
.topbar .search-box input::placeholder { color: var(--text3); }
.topbar .search-box input:focus { 
  border-color: var(--primary); 
  box-shadow: 0 0 0 3px rgba(59,130,246,0.1); 
  background: #fff; 
}
.topbar .search-icon { position:absolute; left:14px; top:50%; transform:translateY(-50%); font-size:0.9rem; pointer-events:none; opacity:0.5; }
.topbar .right { display: flex; align-items: center; gap: 14px; margin-left: auto; }
.topbar .stat { 
  display: flex; align-items: center; gap: 5px; 
  font-size: 0.78rem; color: var(--text2); 
  background: var(--bg); padding: 6px 14px; border-radius: 20px; 
  white-space: nowrap; font-weight: 500;
  border: 1px solid var(--border);
}
.topbar .stat b { color: var(--primary); font-size: 0.9rem; }

/* ── LAYOUT ── */
.layout { display: flex; }
.sidebar {
  width: 210px; flex-shrink: 0; background: #fff; border-right: 1px solid var(--border);
  min-height: calc(100vh - 60px); padding: 12px 0; position: sticky; top: 60px;
  overflow-y: auto; max-height: calc(100vh - 60px);
}
.sidebar-title { 
  padding: 8px 20px 12px; font-size: 0.7rem; font-weight: 700; 
  color: var(--text3); text-transform: uppercase; letter-spacing: 1.5px; 
}
.sidebar .cat-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 16px; margin: 1px 8px; font-size: 0.85rem; color: var(--text2);
  transition: all var(--transition); cursor: pointer; border-radius: 8px;
}
.sidebar .cat-item:hover { background: var(--primary-light); color: var(--primary); }
.sidebar .cat-item.active { 
  background: var(--primary-light); color: var(--primary); font-weight: 600;
  box-shadow: inset 0 0 0 1px rgba(59,130,246,0.15);
}
.sidebar .cat-item .badge { 
  margin-left: auto; font-size: 0.68rem; color: var(--text3); 
  background: var(--bg); padding: 1px 7px; border-radius: 10px; 
  min-width: 20px; text-align: center; font-weight: 500;
}
.sidebar .cat-item.active .badge { background: var(--primary); color: #fff; }

/* ── MAIN ── */
.main { flex: 1; padding: 28px 32px 60px; max-width: 1140px; min-width: 0; }

/* Hero Banner */
.hero {
  background: var(--primary-gradient);
  border-radius: 18px; padding: 44px 48px; color: #fff; margin-bottom: 32px;
  position: relative; overflow: hidden;
  box-shadow: 0 10px 40px rgba(59,130,246,0.2);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='1.5'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}
.hero::after {
  content: ''; position: absolute; 
  width: 300px; height: 300px; 
  background: rgba(255,255,255,0.05); border-radius: 50%;
  right: -80px; top: -80px;
}
.hero > * { position: relative; z-index: 1; }
.hero h1 { font-size: 1.9rem; font-weight: 800; margin-bottom: 6px; letter-spacing: -0.5px; }
.hero p { font-size: 0.95rem; opacity: 0.85; margin-bottom: 20px; }
.hero-stats { display: flex; gap: 36px; }
.hero-stats > div { display: flex; align-items: baseline; gap: 8px; }
.hero-stats .num { font-size: 2.4rem; font-weight: 800; line-height: 1; }
.hero-stats .label { font-size: 0.85rem; opacity: 0.75; }

/* Category Section */
.cat-section { margin-bottom: 40px; }
.cat-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px; padding-bottom: 12px; border-bottom: 2px solid var(--border);
}
.cat-header h2 { 
  font-size: 1.1rem; font-weight: 700; 
  display: flex; align-items: center; gap: 10px;
}
.cat-header h2 .icon { font-size: 1.3rem; }
.cat-header .count { font-size: 0.8rem; color: var(--text3); font-weight: 400; }
.cat-header .count strong { color: var(--primary); font-size: 0.95rem; }

/* Site Grid */
.site-grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); 
  gap: 14px; 
}
.site-card {
  background: #fff; border-radius: var(--radius);
  border: 1px solid var(--border); transition: all var(--transition);
  position: relative; overflow: hidden;
}
.site-card .card-link {
  display: flex; flex-direction: column; gap: 14px; padding: 22px;
  text-decoration: none; color: inherit; width: 100%; height: 100%;
}
.site-card:hover { 
  border-color: var(--primary); box-shadow: var(--shadow-lg); 
  transform: translateY(-3px); 
}
.site-card::after {
  content: ''; position: absolute; inset: 0; 
  background: linear-gradient(135deg, transparent 40%, rgba(59,130,246,0.03));
  opacity: 0; transition: opacity var(--transition); pointer-events: none;
}
.site-card:hover::after { opacity: 1; }
.site-card .top { display: flex; align-items: center; gap: 12px; }
.site-card .favicon { 
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: #f8fafc; border: 1px solid var(--border);
  overflow: hidden;
}
.site-card .favicon img { width: 22px; height: 22px; border-radius: 2px; }
.site-card .favicon .no-icon { font-size: 1.4rem; }
.site-card .name { font-size: 0.95rem; font-weight: 600; color: var(--text); line-height: 1.2; display: -webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.site-card .domain { font-size: 0.72rem; color: var(--text3); margin-top: 2px; }
.site-card .desc { font-size: 0.82rem; color: var(--text2); line-height: 1.6; flex: 1; display: -webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.site-card .bottom { 
  display: flex; align-items: center; justify-content: space-between; 
  margin-top: auto; padding-top: 8px; border-top: 1px solid var(--border);
}
.site-card .tag { 
  padding: 3px 10px; border-radius: 14px; font-size: 0.72rem; 
  background: var(--primary-light); color: var(--primary); font-weight: 500; 
}
.site-card .goto { 
  font-size: 0.8rem; color: var(--text3); 
  display: flex; align-items: center; gap: 4px;
  transition: all var(--transition);
}
.site-card:hover .goto { color: var(--primary); }
.site-card .goto .arrow { transition: transform var(--transition); }
.site-card:hover .goto .arrow { transform: translateX(3px); }

/* Empty */
.empty { text-align: center; padding: 80px 20px; }
.empty .icon { font-size: 4rem; margin-bottom: 16px; animation: float 3s ease-in-out infinite; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }
.empty h3 { font-size: 1.2rem; color: var(--text2); margin-bottom: 6px; font-weight: 600; }
.empty p { font-size: 0.88rem; color: var(--text3); }

/* Footer */
.footer { 
  text-align: center; padding: 20px; color: var(--text3); 
  font-size: 0.78rem; 
  border-top: 1px dashed var(--border);
  margin-top: 40px; 
}

/* ── DETAIL PAGE ── */
.detail { max-width: 880px; margin: 0 auto; padding: 28px 0 60px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text3); margin-bottom: 24px; flex-wrap: wrap; }
.breadcrumb a { color: var(--text2); font-weight: 500; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { opacity: 0.4; }

.detail-hero { 
  background: #fff; border-radius: 18px; padding: 48px; 
  border: 1px solid var(--border); box-shadow: var(--shadow); 
  text-align: center; margin-bottom: 20px;
}
.detail-hero .d-icon { 
  width: 88px; height: 88px; border-radius: 22px; 
  margin: 0 auto 22px; display: flex; align-items: center; justify-content: center; 
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  box-shadow: 0 8px 30px rgba(59,130,246,0.15);
  font-size: 2.8rem;
}
.detail-hero .d-icon img { width: 50px; height: 50px; border-radius: 8px; }
.detail-hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 6px; letter-spacing: -0.5px; }
.detail-hero .d-desc { color: var(--text2); font-size: 0.95rem; margin-bottom: 12px; }
.detail-hero .d-url { 
  display: inline-block; color: var(--primary); font-size: 0.85rem; 
  background: var(--primary-light); padding: 4px 14px; border-radius: 14px;
}
.detail-hero .d-tags { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.detail-hero .d-tags span { 
  padding: 5px 16px; border-radius: 18px; font-size: 0.78rem; 
  background: var(--primary-light); color: var(--primary); 
  border: 1px solid rgba(59,130,246,0.15); font-weight: 500;
}
.detail-hero .d-btn { 
  display: inline-flex; align-items: center; gap: 8px; 
  margin-top: 24px; padding: 14px 40px; border-radius: 28px; 
  background: var(--primary-gradient); color: #fff; font-size: 1rem; 
  font-weight: 600; transition: all var(--transition); 
  box-shadow: 0 6px 24px rgba(59,130,246,0.35);
}
.detail-hero .d-btn:hover { transform: scale(1.04); box-shadow: 0 10px 32px rgba(59,130,246,0.45); }

.info-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 20px 0; }
.info-card { 
  background: #fff; border-radius: var(--radius-sm); 
  padding: 20px; border: 1px solid var(--border); text-align: center;
  transition: all var(--transition);
}
.info-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.info-card .label { font-size: 0.72rem; color: var(--text3); text-transform: uppercase; letter-spacing: 1.2px; margin-bottom: 6px; font-weight: 600; }
.info-card .value { font-size: 1.15rem; font-weight: 700; color: var(--primary); }

.detail-section { 
  background: #fff; border-radius: var(--radius); 
  padding: 28px 32px; border: 1px solid var(--border); margin-bottom: 16px; 
}
.detail-section h2 { font-size: 1.08rem; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.detail-section p { color: var(--text2); line-height: 2; font-size: 0.94rem; }
.detail-section ul { color: var(--text2); line-height: 2.3; padding-left: 24px; font-size: 0.93rem; list-style: none; }
.detail-section ul li { position: relative; padding-left: 8px; }
.detail-section ul li::before { 
  content: ''; position: absolute; left: -18px; top: 12px; 
  width: 6px; height: 6px; background: var(--primary); border-radius: 50%; 
}

.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.related-card { 
  display: flex; align-items: center; gap: 10px; 
  padding: 13px 18px; background: #fff; border: 1px solid var(--border); 
  border-radius: var(--radius-sm); transition: all var(--transition); 
}
.related-card:hover { border-color: var(--primary); background: var(--primary-light); transform: translateX(4px); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .sidebar { width: 180px; }
  .main { padding: 20px 16px; }
  .hero { padding: 32px 24px; }
  .hero h1 { font-size: 1.4rem; }
  .hero-stats { gap: 20px; }
  .hero-stats .num { font-size: 1.8rem; }
}
@media (max-width: 700px) {
  .sidebar { display: none; }
  .topbar { padding: 0 14px; gap: 10px; }
  .topbar .stat { display: none; }
  .topbar .search-box { max-width: 100%; }
  .main { padding: 16px 12px; }
  .hero { padding: 22px 18px; border-radius: 12px; }
  .site-grid { grid-template-columns: repeat(auto-fill, minmax(155px, 1fr)); gap: 8px; }
  .site-card { padding: 14px; border-radius: 10px; gap: 10px; }
  .site-card .favicon { width: 36px; height: 36px; border-radius: 8px; }
  .site-card .name { font-size: 0.85rem; }
  .info-grid { grid-template-columns: 1fr 1fr; }
  .detail-hero { padding: 28px 16px; }
  .detail-hero h1 { font-size: 1.4rem; }
  .detail-section { padding: 20px 16px; }
  .related-grid { grid-template-columns: 1fr 1fr; }
}