* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: #f8f9fa;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 侧边栏 */
.sidebar {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 2px 0 10px rgba(0,0,0,.1);
}
.sidebar .nav-link {
    color: rgba(255,255,255,.8);
    padding: 12px 20px;
    margin: 2px 8px;
    border-radius: 8px;
    transition: all 0.3s;
}
.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: #fff;
    background: rgba(255,255,255,.2);
}
.sidebar .nav-link i { margin-right: 10px; width: 20px; text-align: center; }

/* 主内容 */
.main-content { padding: 30px; }

/* 卡片 */
.card {
    border: none;
    box-shadow: 0 2px 15px rgba(0,0,0,.08);
    border-radius: 10px;
    margin-bottom: 25px;
}
.card-header {
    background-color: #fff;
    border-bottom: 1px solid rgba(0,0,0,.05);
    border-radius: 10px 10px 0 0 !important;
}

/* 统计卡片 */
.stat-card { border-left: 4px solid; border-radius: 10px; }
.stat-card.primary  { border-left-color: #4e73df; background: linear-gradient(to right, #4e73df15, transparent); }
.stat-card.success  { border-left-color: #1cc88a; background: linear-gradient(to right, #1cc88a15, transparent); }
.stat-card.warning  { border-left-color: #f6c23e; background: linear-gradient(to right, #f6c23e15, transparent); }
.stat-card.danger   { border-left-color: #e74a3b; background: linear-gradient(to right, #e74a3b15, transparent); }
.stat-card .card-body { padding: 20px; }
.stat-card h6 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; }
.stat-card h3 { font-weight: 700; margin-bottom: 0; }

/* 表格 */
.table th { background-color: #f8f9fc; border-top: none; font-size: 0.85rem; color: #5a5c69; font-weight: 600; }
.table td { vertical-align: middle; font-size: 0.9rem; }
.table-hover tbody tr:hover { background-color: #f8f9fc; }

/* 按钮 */
.btn { border-radius: 8px; padding: 8px 16px; font-weight: 500; }
.btn-primary { background: linear-gradient(135deg, #667eea, #764ba2); border: none; }
.btn-primary:hover { background: linear-gradient(135deg, #5a6fd6, #6a4192); }

/* 表单 */
.form-control, .form-select { border-radius: 8px; border: 1px solid #d1d3e2; padding: 10px 15px; }
.form-control:focus, .form-select:focus { border-color: #667eea; box-shadow: 0 0 0 0.2rem rgba(102,126,234,.25); }

/* 分页 */
.pagination .page-link { border: none; margin: 0 2px; border-radius: 8px; color: #667eea; }
.pagination .page-item.active .page-link { background: linear-gradient(135deg, #667eea, #764ba2); color: #fff; }

/* 登录页 */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
}
.login-card {
    background: #fff;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0,0,0,.2);
    width: 100%;
    max-width: 400px;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar { min-height: auto; }
    .main-content { padding: 15px; }
}