:root {
  --bg: #0a0a0a;
  --card: #141414;
  --text: #ffffff;
  --sub: #999;
  --primary: #3b82f6;
  --border: #222;
  --transition: 0.3s ease;
}
* { margin: 0; padding: 0; box-sizing: border-box; font-family: system-ui, sans-serif; }
body { background: var(--bg); color: var(--text); line-height: 1.6; padding: 2rem 1rem; }

/* 页面入场 */
.page-fade { animation: fadeIn 0.5s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* 卡片 */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 24px; margin-bottom: 16px; }
.card-animate { transition: all 0.3s ease; animation: slideUp 0.4s ease; }
.card-animate:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(59,130,246,0.12); }
@keyframes slideUp { from { transform: translateY(10px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.btn { padding: 10px 20px; border-radius: 10px; border: none; cursor: pointer; font-size: 14px; transition: 0.2s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-gray { background: #222; color: #eee; }
input, textarea { width: 100%; padding: 12px 16px; background: #111; border: 1px solid var(--border); border-radius: 10px; color: #fff; margin-bottom: 14px; outline: none; }

/* 导航栏 */
.nav-bar { display: flex; gap: 12px; margin-bottom: 30px; flex-wrap: wrap; align-items: center; }
.nav-bar a { color: var(--sub); text-decoration: none; padding: 6px 12px; border-radius: 8px; display: inline-flex; align-items: center; gap: 8px; }
.nav-bar a.active { background: var(--primary); color: #fff; }

/* 头部 */
.header { position: sticky; top: 0; background: var(--bg)/80; backdrop-filter: blur(12px); z-index: 50; padding: 12px 0; border-bottom: 1px solid var(--border); }
.header .container { display: flex; align-items: center; justify-content: space-between; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.nav-group { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.toggle-btn { padding: 8px 16px; border-radius: 12px; background: var(--card); color: var(--text); border: none; cursor: pointer; font-size: 14px; transition: var(--transition); }
.toggle-btn:hover { background: var(--primary)/10; }
.nav-link { color: var(--sub); text-decoration: none; margin-right: 12px; font-size: 14px; padding: 6px 12px; border-radius: 8px; transition: 0.2s; }
.nav-link:hover { color: var(--text); background: var(--card); }
.admin-link { color: var(--primary) !important; font-weight: 500; }
.user-info-link { display: inline-flex !important; align-items: center; gap: 8px; text-decoration: none !important; color: var(--text) !important; }
.nav-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; border: 2px solid var(--primary); background: #222; }
.avatar-preview { width: 80px; height: 80px; border-radius: 50%; object-fit: cover; border: 2px solid var(--primary); margin-bottom: 12px; }

.tip { color: var(--sub); font-size: 13px; margin: 8px 0; }
.row { display: flex; gap: 16px; flex-wrap: wrap; }
.col { flex: 1; min-width: 280px; }

.badge { display: inline-flex; align-items: center; padding: 2px 8px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge-success { background: #05966920; color: #059669; }
.badge-warning { background: #f59e0b20; color: #f59e0b; }
.badge-danger { background: #ef444420; color: #ef4444; }
.badge-info { background: #3b82f620; color: #3b82f6; }
.badge-default { background: #222; color: #999; }

.table-wrapper { overflow-x: auto; margin: 16px 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; padding: 10px 12px; background: #222; color: #999; }
td { padding: 10px 12px; border-bottom: 1px solid #222; }
tr:hover td { background: #1e1e1e; }

.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar { width: 200px; background: #141414; border-right: 1px solid #222; padding: 20px 0; }
.admin-sidebar a { display: block; padding: 10px 20px; color: #999; text-decoration: none; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: #3b82f620; color: var(--primary); }
.admin-main { flex: 1; padding: 24px; }

.pay-methods { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.pay-option { flex: 1; min-width: 120px; padding: 12px; border: 2px solid #222; border-radius: 12px; text-align: center; cursor: pointer; }
.pay-option.active { border-color: var(--primary); background: #3b82f610; }

.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.product-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; transition: transform .2s; }
.product-card:hover { transform: translateY(-4px); }

.copy-btn { background: none; border: 1px solid #333; color: #aaa; padding: 4px 10px; border-radius: 6px; cursor: pointer; }
.qr-preview { max-width: 200px; border: 1px solid #333; border-radius: 8px; margin-top: 8px; }

@media (max-width: 768px) {
  body { padding: 1.5rem 0.8rem; }
  .card { padding: 20px 16px; }
  .nav-bar { gap: 8px; justify-content: center; }
  .product-grid { grid-template-columns: 1fr; }
  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; border-right: none; border-bottom: 1px solid #222; }
}
img { max-width: 100%; height: auto; }