:root {
  --primary: #4a90d9;
  --primary-dark: #3a7bc8;
  --primary-gradient: linear-gradient(135deg, #4a90d9, #67c23a);
  --success-gradient: linear-gradient(135deg, #52c41a, #73d13d);
  --success: #52c41a;
  --danger: #ff4d4f;
  --warning: #faad14;
  --text: #333;
  --text-secondary: #666;
  --text-light: #999;
  --border: #e8e8e8;
  --border-light: #f0f0f0;
  --bg: #f5f5f5;
  --card-bg: #fff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
.page { max-width: 480px; margin: 0 auto; padding: 16px; min-height: 100vh; padding-bottom: 80px; }
.card { background: var(--card-bg); border-radius: 12px; padding: 16px; margin-bottom: 12px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); border: 1px solid var(--border-light); }
.card-title { font-size: 15px; font-weight: 600; margin-bottom: 12px; color: var(--text); }
.btn { display: inline-block; padding: 10px 20px; border-radius: 8px; font-size: 14px; cursor: pointer; border: none; transition: all 0.2s; font-weight: 500; text-align: center; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-outline { background: #fff; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-block { display: block; width: 100%; }
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; transition: border-color 0.2s; background: #fff;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 2px rgba(74,144,217,0.1);
}
.req { color: var(--danger); margin-left: 2px; }
.price { color: var(--danger); font-weight: 700; }
.discount { color: var(--success); font-weight: 600; font-size: 13px; margin-left: 4px; }
.tag { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.tag-success { background: #f6ffed; color: var(--success); border: 1px solid #b7eb8f; }
.tag-warning { background: #fffbe6; color: var(--warning); border: 1px solid #ffe58f; }
.tag-danger { background: #fff2f0; color: var(--danger); border: 1px solid #ffccc7; }
.back-btn { background: none; border: none; font-size: 16px; cursor: pointer; color: var(--primary); padding: 4px 8px; }
.back-arrow { font-size: 20px; margin-right: 4px; }
.empty { text-align: center; padding: 60px 20px; color: var(--text-light); }
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.tab-bar {
  position: fixed; bottom: 0; left: 0; right: 0; background: #fff;
  display: flex; border-top: 1px solid var(--border-light); z-index: 100;
  max-width: 480px; margin: 0 auto;
}
.tab-item {
  flex: 1; text-align: center; padding: 8px 0; cursor: pointer; font-size: 12px; color: var(--text-light); transition: color 0.2s;
}
.tab-item.active { color: var(--primary); font-weight: 600; }
.tab-item .icon { font-size: 20px; display: block; margin-bottom: 2px; }
.fab {
  position: fixed; right: 20px; bottom: 90px; width: 56px; height: 56px;
  border-radius: 50%; border: none; background: var(--primary-gradient); color: #fff;
  font-size: 28px; cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  display: flex; align-items: center; justify-content: center; z-index: 50;
}
.fab:hover { transform: scale(1.05); }
.alert { padding: 10px 16px; border-radius: 8px; margin-bottom: 12px; font-size: 14px; }
.alert-success { background: #f6ffed; color: #389e0d; border: 1px solid #b7eb8f; }
.alert-error { background: #fff2f0; color: #cf1322; border: 1px solid #ffccc7; }
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 16px; }
.pagination a, .pagination span {
  padding: 6px 12px; border-radius: 6px; border: 1px solid var(--border);
  font-size: 13px; color: var(--text);
}
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Admin styles */
.admin-layout { display: flex; min-height: 100vh; }
.admin-aside { width: 220px; background: #304156; color: #bfcbd9; flex-shrink: 0; transition: width 0.3s; overflow: hidden; }
.admin-aside.collapsed { width: 64px; }
.admin-aside .logo { height: 60px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; font-weight: bold; border-bottom: 1px solid rgba(255,255,255,0.1); white-space: nowrap; }
.admin-menu { list-style: none; padding: 0; }
.admin-menu a { display: flex; align-items: center; gap: 10px; padding: 14px 20px; color: #bfcbd9; font-size: 14px; transition: all 0.2s; white-space: nowrap; }
.admin-menu a:hover, .admin-menu a.active { background: #263445; color: #409eff; }
.admin-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.admin-header { height: 60px; background: #fff; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); }
.admin-header .collapse-btn { font-size: 20px; cursor: pointer; color: #666; }
.admin-header .admin-name { cursor: pointer; display: flex; align-items: center; gap: 4px; color: #666; }
.admin-content { flex: 1; padding: 20px; background: #f0f2f5; overflow-y: auto; }
.admin-card { background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 16px; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }

/* Table */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th, .data-table td { padding: 12px 8px; text-align: left; border-bottom: 1px solid var(--border-light); white-space: nowrap; }
.data-table th { background: #fafafa; font-weight: 600; color: var(--text-secondary); }
.data-table tr:hover { background: #f5f7fa; }

/* Stats cards */
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card { background: #fff; border-radius: 8px; padding: 20px; text-align: center; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }
.stat-card .stat-value { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 14px; color: var(--text-light); margin-top: 4px; }

/* Search bar */
.search-bar { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.search-bar input, .search-bar select { padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }

/* Login page */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #4a90d9, #67c23a); }
.login-box { background: #fff; padding: 40px 30px; border-radius: 16px; width: 90%; max-width: 380px; box-shadow: 0 10px 40px rgba(0,0,0,0.15); }
.login-box h2 { text-align: center; margin-bottom: 8px; color: var(--text); }
.login-box .subtitle { text-align: center; color: var(--text-light); margin-bottom: 20px; font-size: 14px; }

/* Responsive admin */
@media (max-width: 768px) {
  .admin-aside { position: fixed; z-index: 200; height: 100vh; }
  .admin-aside.collapsed { width: 0; }
  .stat-cards { grid-template-columns: repeat(2, 1fr); }
}