/* 全局样式变量 */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --info-color: #0dcaf0;
    --light-bg: #f8f9fa;
    --border-color: #dee2e6;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --border-radius: 0.375rem;
}

/* 基础样式 */
body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--light-bg);
    line-height: 1.6;
}

/* 导航栏样式 */
.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.btn-group .btn-check:checked + .btn {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

/* 卡片组件 */
.card {
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.card-header {
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
}

/* 表单控件 */
.form-select, .form-control {
    border-color: var(--border-color);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-select:focus, .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* 按钮样式 */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.15s ease-in-out;
}

.btn-group .btn {
    position: relative;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    
    .btn-group .btn {
        font-size: 0.875rem;
        padding: 0.375rem 0.75rem;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
    }
}

@media (max-width: 576px) {
    .row.g-3 > * {
        margin-bottom: 1rem;
    }
    
    .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-group .btn {
        border-radius: var(--border-radius) !important;
        margin-bottom: 0.25rem;
    }
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: -0.125em;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

@keyframes spinner-border {
    to {
        transform: rotate(360deg);
    }
}

/* 淡入淡出效果 */
.fade-transition {
    transition: opacity 0.3s ease-in-out;
}

.fade-out {
    opacity: 0;
}

.fade-in {
    opacity: 1;
}