:root {
  --primary: #007BFF;
  --primary-dark: #0056b3;
  --primary-light: #e3f2fd;
  --text: #2c3e50;
  --text-light: #7f8c8d;
  --border: #e0e6ed;
  --bg: #f5f7fa;
  --card-bg: #fff;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Arial', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { text-decoration: none; }

/* 导航 */
.navbar { background: #fff; box-shadow: 0 1px 6px rgba(0,0,0,.08); position: sticky; top: 0; z-index: 100; }
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 20px;
  height: 60px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand-icon {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #007BFF, #00c9a7); border-radius: 10px; font-size: 19px; color: #fff;
}
.brand-name { font-size: 18px; font-weight: 700; color: var(--text); }
.nav-links { display: flex; gap: 6px; }
.nav-link { padding: 8px 14px; border-radius: 8px; color: var(--text-light); font-size: 14.5px; font-weight: 500; }
.nav-link:hover { background: #f0f2f5; color: var(--text); }
.nav-link.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.btn-back { color: var(--primary); font-size: 14px; font-weight: 500; }
.btn-back:hover { text-decoration: underline; }

.main { max-width: 1180px; width: 100%; margin: 0 auto; padding: 28px 20px 40px; flex: 1; }

.page-header { text-align: center; margin-bottom: 28px; }
.page-header h1 { font-size: 26px; margin-bottom: 8px; }
.page-header p { color: var(--text-light); font-size: 14.5px; }

/* 站点网格 */
.site-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.site-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius, 10px);
  padding: 18px;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}
.site-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
  border-color: var(--primary);
}
.site-card .site-rank {
  position: absolute;
  top: 12px; right: 14px;
  font-size: 20px;
  color: #ffd700;
  opacity: 0.9;
}
.site-card .site-name { font-weight: 700; font-size: 16px; color: var(--text); margin-bottom: 6px; }
.site-card .site-url { color: var(--text-light); font-size: 13px; word-break: break-all; }
.site-card .site-go {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
}
.site-card .site-go:hover { text-decoration: underline; }

.loading { text-align: center; color: var(--text-light); padding: 40px; }

.footer { text-align: center; padding: 20px; color: var(--text-light); font-size: 12.5px; }

.toast {
  position: fixed; top: 24px; left: 50%;
  transform: translateX(-50%) translateY(-80px);
  background: rgba(0,0,0,.82); color: #fff; padding: 11px 22px;
  border-radius: 8px; font-size: 14px; z-index: 9999;
  opacity: 0; transition: all .35s; pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

@media (max-width: 600px) {
  .nav-inner { flex-wrap: wrap; height: auto; padding: 8px 10px; gap: 4px 10px; }
  .nav-links { flex: 1 1 100%; order: 3; display: flex; flex-wrap: wrap; gap: 4px 8px; margin-top: 4px; }
  .nav-link { padding: 6px 10px; font-size: 14px; }
  .site-grid { grid-template-columns: repeat(2, 1fr); }
}