/* 全局样式 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --success-color: #27ae60;
    --info-color: #3498db;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, #2c3e50, #3498db);
    --gradient-success: linear-gradient(135deg, #27ae60, #2ecc71);
    --gradient-danger: linear-gradient(135deg, #e74c3c, #c0392b);
}

body {
    background-color: #f8fafc;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--dark-color);
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
    background: var(--gradient-primary) !important;
    box-shadow: 0 2px 10px rgba(44, 62, 80, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #fff, rgba(255,255,255,0.8));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-link {
    font-weight: 500;
    padding: 0.75rem 1.25rem !important;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-link:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.1);
    transform: translateX(-100%);
    transition: var(--transition);
}

.nav-link:hover:before {
    transform: translateX(0);
}

.nav-link.active {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

/* 卡片样式 */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(44, 62, 80, 0.15);
}

.card-header {
    background: var(--gradient-primary) !important;
    color: white;
    padding: 1.25rem;
    border-bottom: none;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

/* 按钮样式 */
.btn {
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.1);
    transform: translateX(-100%);
    transition: var(--transition);
}

.btn:hover:before {
    transform: translateX(0);
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
}

.btn-success {
    background: var(--gradient-success);
    border: none;
}

.btn-danger {
    background: var(--gradient-danger);
    border: none;
}

/* 表单样式 */
.form-control {
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    border: 2px solid #e2e8f0;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.9);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
    background: #fff;
}

/* 表格样式 */
.table {
    border-radius: var(--border-radius);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.95);
}

.table thead th {
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    padding: 1rem;
    border: none;
}

.table tbody tr {
    transition: var(--transition);
    border-bottom: 1px solid #e2e8f0;
}

.table tbody tr:hover {
    background-color: rgba(44, 62, 80, 0.05);
}

.table td {
    padding: 1rem;
    vertical-align: middle;
}

/* 列表组样式 */
.list-group-item {
    border: none;
    border-radius: var(--border-radius) !important;
    margin-bottom: 0.5rem;
    background: rgba(255, 255, 255, 0.95);
    transition: var(--transition);
    padding: 1rem;
}

.list-group-item:hover {
    background: rgba(44, 62, 80, 0.05);
    transform: translateX(5px);
}

/* 徽章样式 */
.badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    background: var(--gradient-primary);
}

/* 警告框样式 */
.alert {
    border-radius: var(--border-radius);
    border: none;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--box-shadow);
}

.alert-danger {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1), rgba(192, 57, 43, 0.1));
    color: #c0392b;
}

.alert-success {
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.1), rgba(46, 204, 113, 0.1));
    color: #27ae60;
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 响应式布局优化 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .table-responsive {
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
    }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-primary);
}

/* 毛玻璃效果 */
.glass-effect {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* 统计卡片样式 */
.stats-card {
    position: relative;
    overflow: hidden;
    padding: 1.5rem;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.05;
    z-index: 0;
}

.stats-card .stats-icon {
    position: absolute;
    right: 1rem;
    bottom: 1rem;
    font-size: 3rem;
    opacity: 0.1;
}

/* 图表容器样式 */
.chart-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 1.5rem;
}