:root {
    --primary: #4A90D9;
    --primary-dark: #3A7BC8;
    --primary-light: #E8F0FE;
    --white: #FFFFFF;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-600: #6C757D;
    --text-dark: #333333;
    --text-muted: #999999;
    --success: #28A745;
    --danger: #DC3545;
    --warning: #FFC107;
    --info: #17A2B8;
    --sidebar-width: 240px;
}

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

body {
    font-family: -apple-system, "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background: var(--gray-100);
    color: var(--text-dark);
    font-size: 14px;
    line-height: 1.6;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    color: var(--primary-dark);
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-primary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
}

/* 顶部导航 */
.top-navbar {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.top-navbar .brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
    width: var(--sidebar-width);
    flex-shrink: 0;
}

.top-navbar .brand img {
    height: 32px;
}

.top-navbar .nav-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 15px;
}

.top-navbar .nav-right .user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-dark);
    font-size: 14px;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    position: fixed;
    top: 56px;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 999;
}

.sidebar .nav-menu {
    list-style: none;
    padding: 15px 0;
}

.sidebar .nav-menu .menu-title {
    padding: 10px 20px 5px;
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.sidebar .nav-menu .menu-item {
    margin: 2px 10px;
}

.sidebar .nav-menu .menu-item a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    border-radius: 6px;
    color: var(--text-dark);
    transition: all 0.15s ease;
    font-size: 14px;
}

.sidebar .nav-menu .menu-item a:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.sidebar .nav-menu .menu-item a.active {
    background: var(--primary);
    color: var(--white);
}

.sidebar .nav-menu .menu-item a i {
    width: 20px;
    text-align: center;
    font-size: 15px;
}

/* 主内容区域 */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: 56px;
    padding: 20px;
    min-height: calc(100vh - 56px);
}

/* 页面标题 */
.page-header {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-header h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.page-header .breadcrumb {
    margin: 0;
    background: none;
    padding: 0;
    font-size: 13px;
}

/* 卡片 */
.card {
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: none;
}

.card-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 15px 20px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body {
    padding: 20px;
}

/* 统计卡片 */
.stat-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-card .stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--white);
    background: var(--primary);
    flex-shrink: 0;
}

.stat-card .stat-icon.success { background: var(--success); }
.stat-card .stat-icon.warning { background: var(--warning); }
.stat-card .stat-icon.danger { background: var(--danger); }
.stat-card .stat-icon.info { background: var(--info); }

.stat-card .stat-info h3 {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}

.stat-card .stat-info p {
    color: var(--text-muted);
    margin: 0;
    font-size: 13px;
}

/* 表格 */
.table-container {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    overflow: hidden;
}

.table-container table {
    margin: 0;
}

.table-container table th {
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-dark);
    padding: 12px 15px;
    white-space: nowrap;
}

.table-container table td {
    padding: 12px 15px;
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-200);
    font-size: 13px;
}

/* 状态标签 */
.badge-status {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: #E8F5E9; color: var(--success); }
.badge-danger { background: #FFEBEE; color: var(--danger); }
.badge-warning { background: #FFF8E1; color: #F57C00; }
.badge-info { background: #E3F2FD; color: var(--info); }
.badge-primary { background: var(--primary-light); color: var(--primary); }

/* 分页 */
.pagination-wrapper {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--gray-200);
    font-size: 13px;
}

.pagination-wrapper .page-info {
    color: var(--text-muted);
}

/* 登录页面 */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
}

.login-box {
    background: var(--white);
    border-radius: 10px;
    padding: 40px;
    width: 400px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.login-box .login-logo {
    text-align: center;
    margin-bottom: 30px;
}

.login-box .login-logo h2 {
    color: var(--primary);
    font-size: 24px;
    font-weight: 700;
}

.login-box .login-logo p {
    color: var(--text-muted);
    font-size: 14px;
}

/* 表单 */
.form-label {
    font-weight: 500;
    font-size: 13px;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(74, 144, 217, 0.15);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 15px;
    display: block;
}

.empty-state h5 {
    margin-bottom: 10px;
    color: var(--text-dark);
}

/* 弹窗覆盖 */
.modal-header {
    background: var(--primary);
    color: var(--white);
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin-left: 0;
    }
    .top-navbar .brand {
        width: auto;
    }
}