/**
 * LMS Course Filters Styles - 现代化设计
 * 课程筛选器样式文件 - 全新美化版本
 * 
 * 为课程列表页面的筛选器组件提供现代化、响应式的样式
 * 包含玻璃态效果、渐变背景、流畅动画和更好的用户体验
 */

/* ===== 筛选器主容器 ===== */
.lms-course-filters {
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.95) 0%, 
        rgba(248, 250, 252, 0.95) 50%, 
        rgba(241, 245, 249, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 32px;
    margin: 0 !important;
    box-shadow: 
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(148, 163, 184, 0.15);
    position: relative;
    overflow: hidden;
}

/* 在侧边栏中的筛选器 - 优化样式 */
.lms-course-sidebar .lms-course-filters {
    max-width: 100% !important;
    width: 100% !important;
    padding: 20px !important;
    border-radius: 16px !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-filters-container {
    gap: 16px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-filter-group {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-filter-label {
    font-size: 13px !important;
    margin-bottom: 8px !important;
    width: 100% !important;
}

.lms-course-sidebar .lms-filter-input,
.lms-course-sidebar .lms-custom-select,
.lms-course-sidebar .lms-custom-select .lms-select-header {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-select-header {
    padding: 12px 16px !important;
    font-size: 13px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-filter-input {
    padding: 12px 16px !important;
    font-size: 13px !important;
    min-height: 44px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-select-dropdown {
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    left: 0 !important;
    right: 0 !important;
}

.lms-course-sidebar .lms-filter-actions-container {
    flex-direction: column !important;
    gap: 12px !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

.lms-course-sidebar .lms-results-text {
    font-size: 13px !important;
    text-align: center !important;
    width: 100% !important;
}

.lms-course-sidebar #lms-reset-filters {
    width: 100% !important;
    max-width: 100% !important;
    padding: 12px 16px !important;
    font-size: 13px !important;
    box-sizing: border-box !important;
}

/* 背景装饰效果 */
.lms-course-filters::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(147, 51, 234, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.lms-filters-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: end;
    position: relative;
    z-index: 1;
}

/* 在侧边栏中的筛选器容器 */
.lms-course-sidebar .lms-filters-container {
    grid-template-columns: 1fr;
}

/* ===== 筛选器组 ===== */
.lms-filter-group {
    display: flex;
    flex-direction: column;
    position: relative;
}

/* 特殊布局：结果统计和重置按钮 */
.lms-filter-group:has(.lms-filter-results),
.lms-filter-group:has(.lms-btn) {
    grid-column: span 1;
    align-self: end;
}

/* ===== 筛选器标签 ===== */
.lms-filter-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.lms-filter-label:hover {
    color: #3b82f6;
    transform: translateX(2px);
}

.lms-filter-icon {
    font-size: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}

.lms-filter-label:hover .lms-filter-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 4px 8px rgba(59, 130, 246, 0.4);
}

/* ===== 筛选器控件通用样式 ===== */
/* ===== 下拉选择框样式 ===== */
.lms-course-filters .lms-filter-select {
    width: 100% !important;
    padding: 16px 20px !important;
    border: 2px solid #e2e8f0 !important;
    border-radius: 16px !important;
    background: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(10px) !important;
    -webkit-backdrop-filter: blur(10px) !important;
    font-size: 15px !important;
    font-weight: 500 !important;
    color: #1e293b !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    box-shadow: 
        0 1px 3px 0 rgba(0, 0, 0, 0.1),
        0 1px 2px 0 rgba(0, 0, 0, 0.06) !important;
    position: relative !important;
    cursor: pointer !important;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 8l4 4 4-4'/%3e%3c/svg%3e") !important;
    background-position: right 16px center !important;
    background-repeat: no-repeat !important;
    background-size: 20px !important;
    padding-right: 48px !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
    height: auto !important;
    min-height: 52px !important;
    line-height: 1.5 !important;
    box-sizing: border-box !important;
}

.lms-course-filters .lms-filter-select:focus {
    outline: none !important;
    border-color: #3b82f6 !important;
    background: rgba(255, 255, 255, 0.95) !important;
    box-shadow: 
        0 0 0 4px rgba(59, 130, 246, 0.1),
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06) !important;
    transform: translateY(-2px) !important;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%233b82f6' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 8l4 4 4-4'/%3e%3c/svg%3e") !important;
}

.lms-course-filters .lms-filter-select:hover {
    border-color: #cbd5e1 !important;
    transform: translateY(-1px) !important;
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06) !important;
}



/* ===== 搜索输入框 ===== */
.lms-course-filters .lms-filter-input,
.lms-course-filters input.lms-filter-input,
#lms-search-filter.lms-filter-input {
    width: 100% !important;
    padding: 17px 20px !important;
    border: 2px solid #475569 !important;
    border-radius: 16px !important;
    background: rgba(51, 65, 85, 0.95) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    font-size: 15px !important;
    font-weight: 500 !important;
    color: #ffffff !important;
    transition: none !important;
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06) !important;
    position: relative !important;
    height: auto !important;
    min-height: 52px !important;
    line-height: 1.5 !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
    box-sizing: border-box !important;
}

.lms-course-filters .lms-filter-input:focus,
.lms-course-filters input.lms-filter-input:focus,
#lms-search-filter.lms-filter-input:focus {
    outline: none !important;
    border-color: #60a5fa !important;
    background: rgba(51, 65, 85, 0.98) !important;
    box-shadow: 
        0 0 0 3px rgba(96, 165, 250, 0.15),
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06) !important;
}

.lms-course-filters .lms-filter-input:hover,
.lms-course-filters input.lms-filter-input:hover,
#lms-search-filter.lms-filter-input:hover {
    border-color: #64748b !important;
    box-shadow: 
        0 6px 10px -3px rgba(0, 0, 0, 0.15),
        0 3px 6px -2px rgba(0, 0, 0, 0.1) !important;
}

.lms-course-filters .lms-filter-input::placeholder,
.lms-course-filters input.lms-filter-input::placeholder,
#lms-search-filter.lms-filter-input::placeholder {
    color: rgba(255, 255, 255, 0.7) !important;
    font-style: italic !important;
    font-weight: 400 !important;
}

.lms-course-filters .lms-filter-input:focus::placeholder,
.lms-course-filters input.lms-filter-input:focus::placeholder,
#lms-search-filter.lms-filter-input:focus::placeholder {
    color: rgba(255, 255, 255, 0.5) !important;
}

/* 搜索框激活状态 - 与下拉菜单保持一致 */
.lms-course-filters .lms-filter-active .lms-filter-input,
.lms-course-filters .lms-filter-active input.lms-filter-input,
.lms-course-filters .lms-filter-active #lms-search-filter.lms-filter-input {
    border-color: #60a5fa !important;
    background: rgba(51, 65, 85, 0.98) !important;
    box-shadow: 
        0 0 0 3px rgba(96, 165, 250, 0.15),
        0 8px 15px -5px rgba(0, 0, 0, 0.2),
        0 4px 8px -3px rgba(0, 0, 0, 0.15) !important;
}



/* ===== 结果统计 ===== */
.lms-filter-actions-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    background: rgba(51, 65, 85, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px solid #475569;
    border-radius: 16px;
    padding: 12px 16px;
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
    min-height: 52px;
    justify-content: center;
    color: #ffffff;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
}

/* 结果统计文字水平排列 */
.lms-results-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    white-space: nowrap;
}

#lms-results-count {
    display: inline;
}



#lms-results-count {
    font-size: 16px;
    font-weight: 700;
    margin-right: 4px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* ===== 按钮样式 ===== */
.lms-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: none;
    min-width: 80px;
    position: relative;
    overflow: hidden;
}

.lms-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.lms-btn:hover::before {
    left: 100%;
}

.lms-btn-secondary {
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.lms-btn-secondary:hover {
    background: rgba(220, 216, 239, 0.907);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-1px);
    box-shadow: none;
}

.lms-btn-secondary:active {
    transform: translateY(0);
    box-shadow: none;
}

.lms-btn-icon {
    font-size: 14px;
    /* 移除旋转动画 */
}

/* ===== 加载状态 ===== */
.lms-filters-loading {
    position: relative;
}

.lms-filters-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(4px);
    border-radius: 24px;
    pointer-events: none;
    z-index: 10;
}

.lms-filters-loading::before {
    content: '🔄';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    animation: spin 1s linear infinite;
    z-index: 11;
}

@keyframes spin {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ===== 动画效果 ===== */
@keyframes filterPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

@keyframes filterSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lms-filter-group {
    animation: filterSlideIn 0.6s ease-out;
}

.lms-filter-group:nth-child(1) { animation-delay: 0.1s; }
.lms-filter-group:nth-child(2) { animation-delay: 0.2s; }
.lms-filter-group:nth-child(3) { animation-delay: 0.3s; }
.lms-filter-group:nth-child(4) { animation-delay: 0.4s; }
.lms-filter-group:nth-child(5) { animation-delay: 0.5s; }

.lms-filter-group:focus-within {
    animation: filterPulse 0.3s ease-in-out;
}

/* ===== 筛选器激活状态 ===== */
.lms-filter-active .lms-filter-select,
.lms-filter-active .lms-filter-input {
    border-color: #3b82f6;
    background: rgba(239, 246, 255, 0.9);
    box-shadow: 
        0 0 0 4px rgba(59, 130, 246, 0.1),
        0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* ===== 无结果状态 ===== */
.lms-no-results {
    text-align: center;
    padding: 60px 20px;
    color: #64748b;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(148, 163, 184, 0.1);
}

.lms-no-results-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.6;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.lms-no-results-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #1e293b;
}

.lms-no-results-text {
    font-size: 16px;
    color: #64748b;
    line-height: 1.6;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .lms-filters-container {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 20px;
    }
    
    .lms-course-filters {
        padding: 28px;
        margin: 20px;
    }
    
    /* 在上下布局时，恢复筛选器的原始样式 */
    .lms-course-layout:not(.lms-sidebar-layout) .lms-course-filters,
    body:not(:has(.lms-course-sidebar)) .lms-course-filters {
        padding: 32px !important;
        border-radius: 24px !important;
    }
    
    .lms-course-layout:not(.lms-sidebar-layout) .lms-filters-container,
    body:not(:has(.lms-course-sidebar)) .lms-filters-container {
        gap: 24px !important;
    }
}

@media (max-width: 768px) {
    .lms-course-filters {
        padding: 24px;
        margin: 20px;
        border-radius: 20px;
    }
    
    .lms-filters-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .lms-filter-group {
        width: 100%;
    }
    
    .lms-filter-select,
    .lms-filter-input {
        padding: 14px 18px;
        font-size: 16px; /* 移动端更大的字体 */
    }
    
    .lms-filter-results {
        order: -1;
        width: 100%;
        padding: 14px 20px;
    }
    
    .lms-btn {
        width: 100%;
        padding: 14px 20px;
    }
    
    .lms-filter-label {
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .lms-course-filters {
        margin-left: -16px;
        margin-right: -16px;
        border-radius: 0;
        padding: 20px 16px;
    }
    
    .lms-filter-label {
        font-size: 14px;
    }
    
    .lms-filter-select,
    .lms-filter-input {
        padding: 12px 16px;
        font-size: 16px;
        border-radius: 12px;
    }
    
    .lms-filter-results {
        font-size: 14px;
        padding: 12px 18px;
        border-radius: 12px;
    }
    
    #lms-results-count {
        font-size: 18px;
    }
    
    .lms-btn {
        padding: 12px 18px;
        border-radius: 12px;
    }
}

/* ===== 深色模式支持 ===== */
@media (prefers-color-scheme: dark) {
    .lms-course-filters {
        background: linear-gradient(135deg, 
            rgba(30, 41, 59, 0.95) 0%, 
            rgba(15, 23, 42, 0.95) 50%, 
            rgba(2, 6, 23, 0.95) 100%);
        border-color: rgba(71, 85, 105, 0.3);
    }
    
    .lms-filter-label {
        color: #f1f5f9;
    }
    
    .lms-filter-label:hover {
        color: #60a5fa;
    }
    
    .lms-filter-select,
    .lms-filter-input {
        background: rgba(51, 65, 85, 0.9);
        border-color: #475569;
        color: #f1f5f9;
    }
    
    .lms-filter-select:focus,
    .lms-filter-input:focus {
        border-color: #60a5fa;
        background: rgba(51, 65, 85, 0.95);
        box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.1);
    }
    
    .lms-filter-input::placeholder {
        color: #94a3b8;
    }
    
    .lms-no-results {
        background: rgba(30, 41, 59, 0.8);
        border-color: rgba(71, 85, 105, 0.2);
        color: #cbd5e1;
    }
    
    .lms-no-results-title {
        color: #f1f5f9;
    }
}

/* ===== 高对比度模式支持 ===== */
@media (prefers-contrast: high) {
    .lms-filter-select,
    .lms-filter-input {
        border-width: 3px;
        border-color: #000000;
    }
    
    .lms-filter-select:focus,
    .lms-filter-input:focus {
        border-color: #0066cc;
        box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.3);
    }
    
    .lms-filter-results {
        background: #0066cc;
        color: #ffffff;
        border: 2px solid #000000;
    }
}

/* ===== 动作偏好支持 ===== */
@media (prefers-reduced-motion: reduce) {
    .lms-filter-select,
    .lms-filter-input,
    .lms-btn,
    .lms-filter-label,
    .lms-filter-icon {
        transition: none;
    }
    
    .lms-filter-group:focus-within {
        animation: none;
    }
    
    .lms-filter-group {
        animation: none;
    }
    
    .lms-btn:hover .lms-btn-icon {
        transform: none;
    }
    
    .lms-filter-label:hover .lms-filter-icon {
        transform: none;
    }
    
    .lms-no-results-icon {
        animation: none;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .lms-course-filters {
        display: none;
    }
}

/* ===== 焦点可见性增强 ===== */
.lms-filter-select:focus-visible,
.lms-filter-input:focus-visible,
.lms-btn:focus-visible {
    outline: 3px solid #3b82f6;
    outline-offset: 2px;
}

/* ===== 自定义滚动条 ===== */
.lms-filter-select::-webkit-scrollbar {
    width: 8px;
}

.lms-filter-select::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

.lms-filter-select::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.lms-filter-select::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ===== 工具提示样式 ===== */
.lms-filter-tooltip {
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: #1e293b;
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.lms-filter-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 4px solid transparent;
    border-top-color: #1e293b;
}

.lms-filter-group:hover .lms-filter-tooltip {
    opacity: 1;
}

/* ===== 筛选器状态指示器 ===== */
.lms-filter-status {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
    animation: fadeIn 0.3s ease;
}

.lms-filter-status-content {
    display: flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    padding: 16px 24px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
    animation: pulse 2s infinite;
}

.lms-filter-status-icon {
    font-size: 20px;
    animation: spin 1s linear infinite;
}

.lms-filter-status-text {
    font-size: 15px;
    font-weight: 600;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* ===== 筛选器组悬停效果增强 ===== */
.lms-filter-group {
    position: relative;
}

/* 移除悬浮时的背景渐变色 */
.lms-filter-group::before {
    display: none; /* 移除背景渐变效果 */
}

/* ===== 下拉菜单美化 ===== */
.lms-filter-select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 16px center;
    background-repeat: no-repeat;
    background-size: 20px;
    padding-right: 48px;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    position: relative;
    transition: all 0.3s ease;
}

/* 下拉菜单打开时的样式 */
.lms-filter-select:focus {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%233b82f6' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    transform: translateY(-1px);
    box-shadow: 
        0 0 0 4px rgba(59, 130, 246, 0.1),
        0 8px 25px -5px rgba(59, 130, 246, 0.2),
        0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* 自定义下拉菜单选项样式 */
.lms-filter-select option {
    background: white;
    color: #1e293b;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

/* 选项悬停效果 */
.lms-filter-select option:hover {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: #3b82f6;
    transform: translateX(4px);
}

/* 选中选项样式 */
.lms-filter-select option:checked {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

/* 选项焦点样式 */
.lms-filter-select option:focus {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    color: #3b82f6;
    outline: none;
    box-shadow: inset 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* 第一个选项（默认选项）特殊样式 */
.lms-filter-select option:first-child {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: #64748b;
    font-style: italic;
    border-bottom: 1px solid #e2e8f0;
}

.lms-filter-select option:first-child:hover {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    color: #475569;
}

/* 深色模式下的下拉菜单 */
@media (prefers-color-scheme: dark) {
    .lms-filter-select option {
        background: #374151;
        color: #f1f5f9;
    }
    
    .lms-filter-select option:hover {
        background: linear-gradient(135deg, #4b5563 0%, #6b7280 100%);
        color: #60a5fa;
    }
    
    .lms-filter-select option:checked {
        background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
        color: white;
        box-shadow: 0 2px 4px rgba(96, 165, 250, 0.3);
    }
    
    .lms-filter-select option:focus {
        background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
        color: #60a5fa;
        box-shadow: inset 0 0 0 2px rgba(96, 165, 250, 0.2);
    }
    
    .lms-filter-select option:first-child {
        background: linear-gradient(135deg, #4b5563 0%, #6b7280 100%);
        color: #9ca3af;
        border-bottom: 1px solid #6b7280;
    }
    
    .lms-filter-select option:first-child:hover {
        background: linear-gradient(135deg, #6b7280 0%, #9ca3af 100%);
        color: #d1d5db;
    }
}

/* 移动端下拉菜单优化 */
@media (max-width: 768px) {
    .lms-filter-select option {
        padding: 16px 20px;
        font-size: 16px;
        min-height: 48px;
        display: flex;
        align-items: center;
    }
    
    .lms-filter-select option:hover {
        transform: translateX(2px);
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .lms-filter-select option {
        border: 1px solid #000000;
    }
    
    .lms-filter-select option:hover {
        background: #0066cc;
        color: #ffffff;
    }
    
    .lms-filter-select option:checked {
        background: #0066cc;
        color: #ffffff;
        border: 2px solid #000000;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .lms-filter-select option {
        transition: none;
    }
    
    .lms-filter-select option:hover {
        transform: none;
    }
}

/* ===== 筛选器输入框焦点效果增强 ===== */
.lms-filter-select:focus,
.lms-filter-input:focus {
    outline: none;
    border-color: #3b82f6;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 
        0 0 0 4px rgba(59, 130, 246, 0.1),
        0 8px 25px -5px rgba(59, 130, 246, 0.2),
        0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
}

/* ===== 筛选器标签悬停效果增强 ===== */
.lms-filter-label:hover {
    color: #3b82f6;
    transform: translateX(3px);
}

.lms-filter-label:hover .lms-filter-icon {
    transform: scale(1.15) rotate(10deg);
    box-shadow: 0 6px 12px rgba(59, 130, 246, 0.5);
}

/* ===== 结果统计悬停效果增强 ===== */
.lms-filter-results:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 25px 50px -12px rgba(59, 130, 246, 0.5),
        0 10px 10px -5px rgba(59, 130, 246, 0.3);
}

/* ===== 按钮悬停效果增强 ===== */
.lms-btn:hover {
    transform: translateY(-4px);
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.25),
        0 10px 10px -5px rgba(0, 0, 0, 0.1);
}

/* 移除按钮图标旋转动画 */

/* ===== 移动端优化 ===== */
@media (max-width: 768px) {
    .lms-filter-tooltip {
        display: none; /* 移动端隐藏工具提示 */
    }
    
    .lms-filter-status-content {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .lms-filter-status-icon {
        font-size: 18px;
    }
}

/* ===== 深色模式下的状态指示器 ===== */
@media (prefers-color-scheme: dark) {
    .lms-filter-status {
        background: rgba(30, 41, 59, 0.9);
    }
    
    .lms-filter-group::before {
        background: linear-gradient(135deg, #60a5fa, #3b82f6, #a855f7);
    }
}

/* ===== 通知消息样式 ===== */
.lms-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: 12px;
    padding: 16px 20px;
    box-shadow: 
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(148, 163, 184, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1000;
    max-width: 400px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.lms-notification.show {
    transform: translateX(0);
}

.lms-notification-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.lms-notification-close {
    background: none;
    border: none;
    font-size: 20px;
    font-weight: bold;
    color: #94a3b8;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.lms-notification-close:hover {
    background: rgba(148, 163, 184, 0.1);
    color: #64748b;
    transform: scale(1.1);
}

.lms-notification-close:active {
    transform: scale(0.95);
}

.lms-notification-text {
    font-size: 14px;
    font-weight: 500;
    color: #1e293b;
    line-height: 1.4;
}

/* 通知类型样式 */
.lms-notification-success {
    border-left: 4px solid #10b981;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.lms-notification-error {
    border-left: 4px solid #ef4444;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.lms-notification-info {
    border-left: 4px solid #3b82f6;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(255, 255, 255, 0.95) 100%);
}

/* ===== 重置按钮成功状态 ===== */
.lms-btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    color: white !important;
    transform: scale(1.05) !important;
    box-shadow: 
        0 20px 25px -5px rgba(16, 185, 129, 0.3),
        0 10px 10px -5px rgba(16, 185, 129, 0.2) !important;
}

.lms-btn-success:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%) !important;
    transform: scale(1.05) translateY(-3px) !important;
}

/* ===== 深色模式下的通知 ===== */
@media (prefers-color-scheme: dark) {
    .lms-notification {
        background: rgba(30, 41, 59, 0.95);
        border-color: rgba(71, 85, 105, 0.3);
    }
    
    .lms-notification-text {
        color: #f1f5f9;
    }
    
    .lms-notification-success {
        background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(30, 41, 59, 0.95) 100%);
    }
    
    .lms-notification-error {
        background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(30, 41, 59, 0.95) 100%);
    }
    
    .lms-notification-info {
        background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(30, 41, 59, 0.95) 100%);
    }
    
    .lms-notification-close {
        color: #cbd5e1;
    }
    
    .lms-notification-close:hover {
        background: rgba(203, 213, 225, 0.1);
        color: #f1f5f9;
    }
}

/* ===== 移动端通知优化 ===== */
@media (max-width: 768px) {
    .lms-notification {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: none;
        transform: translateY(-100%);
    }
    
    .lms-notification.show {
        transform: translateY(0);
    }
}

/* ===== 动画优化 ===== */
.lms-notification {
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== 无障碍支持 ===== */
@media (prefers-reduced-motion: reduce) {
    .lms-notification {
        animation: none;
        transition: none;
    }
    
    .lms-btn-success {
        transition: none;
    }
}

/* ===== 高对比度模式 ===== */
@media (prefers-contrast: high) {
    .lms-notification {
        border-width: 2px;
        border-color: #000000;
    }
    
    .lms-notification-success {
        border-left-color: #006600;
    }
    
    .lms-notification-error {
        border-left-color: #cc0000;
    }
    
    .lms-notification-info {
        border-left-color: #0066cc;
    }
}

/* ===== 自定义下拉菜单样式 ===== */
.lms-custom-select {
    position: relative;
    width: 100%;
    cursor: pointer;
    user-select: none;
}


.lms-select-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 16px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    font-size: 15px;
    font-weight: 500;
    color: #1e293b;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 1px 3px 0 rgba(0, 0, 0, 0.1),
        0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.lms-select-header:hover {
    border-color: #cbd5e1;
    transform: translateY(-1px);
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.lms-select-arrow {
    font-size: 12px;
    color: #6b7280;
    transition: transform 0.3s ease;
}

/* 分类筛选的特殊宽下拉菜单 */
.lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    width: 600px;
    max-height: none;
}

/* 侧边栏中的分类下拉菜单 - 适配宽度 */
.lms-course-sidebar .lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown {
    width: 100% !important;
    max-width: 100% !important;
    left: 0 !important;
    right: 0 !important;
    box-sizing: border-box !important;
    background: linear-gradient(135deg, 
        rgba(51, 65, 85, 0.95) 0%, 
        rgba(71, 85, 105, 0.95) 50%, 
        rgba(100, 116, 139, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px solid #475569;
    border-top: none;
    border-radius: 0 0 16px 16px;
    box-shadow: 
        0 10px 15px -3px rgba(0, 0, 0, 0.3),
        0 4px 6px -2px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: visible;
    padding: 16px;
    margin-top: -2px;
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown.lms-select-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 分类选项网格布局 - 5列 */
.lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: flex-start;
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option {
    flex: 0 0 calc(20% - 8px);
    margin: 4px;
    padding: 8px 8px;
}

/* 侧边栏中的分类选项 - 改为2列布局 */
.lms-course-sidebar .lms-custom-select[data-target="lms-category-filter"] .lms-select-option {
    flex: 0 0 calc(50% - 8px) !important;
    margin: 4px !important;
    padding: 8px 6px !important;
    font-size: 11px !important;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
    font-size: 12px;
    font-weight: 500;
    color: #ffffff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* 分类选项颜色样式 - 与课程卡片完全一致 */
.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="五论-中观"] {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    border-color: rgba(30, 64, 175, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="五论-俱舍"] {
    background: linear-gradient(135deg, #166534 0%, #22c55e 100%);
    border-color: rgba(22, 101, 52, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="五论-因明"] {
    background: linear-gradient(135deg, #7c3aed 0%, #a855f7 100%);
    border-color: rgba(124, 58, 237, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="五论-戒律"] {
    background: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
    border-color: rgba(220, 38, 38, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="五论-现观"] {
    background: linear-gradient(135deg, #ea580c 0%, #f97316 100%);
    border-color: rgba(234, 88, 12, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="五论-般若"] {
    background: linear-gradient(135deg, #d97706 0%, #fbbf24 100%);
    border-color: rgba(217, 119, 6, 0.3);
    color: #1f2937;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="实修"] {
    background: linear-gradient(135deg, #ea580c 0%, #fb923c 100%);
    border-color: rgba(234, 88, 12, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="开示"] {
    background: linear-gradient(135deg, #be123c 0%, #f43f5e 100%);
    border-color: rgba(190, 18, 60, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="念修"] {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    border-color: rgba(5, 150, 105, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="佛经讲解"] {
    background: linear-gradient(135deg, #0f766e 0%, #14b8a6 100%);
    border-color: rgba(15, 118, 110, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="净土"] {
    background: linear-gradient(135deg, #760f0f 0%, #b81414 100%);
    border-color: rgba(15, 118, 110, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="入门"] {
    background: linear-gradient(135deg, #600f76 0%, #b814b5 100%);
    border-color: rgba(15, 118, 110, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="论典讲解"] {
    background: linear-gradient(135deg, #374151 0%, #6b7280 100%);
    border-color: rgba(55, 65, 81, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="经论原文"] {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    border-color: rgba(30, 58, 138, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="传记"] {
    background: linear-gradient(135deg, #92400e 0%, #d97706 100%);
    border-color: rgba(146, 64, 14, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="法王教言"] {
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    border-color: rgba(99, 102, 241, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="传统文化"] {
    background: linear-gradient(135deg, #065f46 0%, #059669 100%);
    border-color: rgba(6, 95, 70, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="著作"] {
    background: linear-gradient(135deg, #4338ca 0%, #6366f1 100%);
    border-color: rgba(67, 56, 202, 0.3);
}

.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value="其他"] {
    background: linear-gradient(135deg, #4b5563 0%, #9ca3af 100%);
    border-color: rgba(75, 85, 99, 0.3);
}

/* 默认选项样式 */
.lms-custom-select[data-target="lms-category-filter"] .lms-select-option[data-value=""] {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: #64748b;
    border: 1px solid #e2e8f0;
    text-shadow: none;
}

/* 排序方式的三列布局 */
.lms-custom-select[data-target="lms-sort-filter"] .lms-select-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    width: 400px;
    max-height: none;
    background: linear-gradient(135deg, 
        rgba(51, 65, 85, 0.95) 0%, 
        rgba(71, 85, 105, 0.95) 50%, 
        rgba(100, 116, 139, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px solid #475569;
    border-top: none;
    border-radius: 0 0 16px 16px;
    box-shadow: 
        0 10px 15px -3px rgba(0, 0, 0, 0.3),
        0 4px 6px -2px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: visible;
    padding: 12px;
    margin-top: -2px;
}

.lms-custom-select[data-target="lms-sort-filter"] .lms-select-dropdown.lms-select-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 排序选项4列布局 */
.lms-custom-select[data-target="lms-sort-filter"] .lms-select-dropdown {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: flex-start;
}

.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option {
    flex: 0 0 calc(25% - 8px);
    margin: 4px;
    padding: 8px 6px;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
    text-align: center;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
    background: #f8fafc;
    color: #374151;
    cursor: pointer;
}

.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option:hover {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    color: #3b82f6;
    border-color: #3b82f6;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option.selected {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    border-color: #3b82f6;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

/* 普通下拉菜单样式（用于其他情况） */
.lms-select-dropdown:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-dropdown) {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 2px solid #e2e8f0;
    border-top: none;
    border-radius: 0 0 16px 16px;
    box-shadow: 
        0 10px 15px -3px rgba(0, 0, 0, 0.1),
        0 4px 6px -2px rgba(0, 0, 0, 0.05);
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000; /* 确保下拉菜单在最顶层 */
    opacity: 0;
    transform: translateY(-10px);
    margin-top: -2px; /* 调整位置，避免边框重叠 */
}

.lms-select-dropdown:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-dropdown).lms-select-open {
    max-height: 300px;
    opacity: 1;
    transform: translateY(0);
}

/* 普通选项样式 */
.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option) {
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    color: #1e293b;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 1px solid #f1f5f9;
    position: relative;
}

.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option):last-child {
    border-bottom: none;
}

.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option):hover {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: #3b82f6;
    transform: translateX(4px);
}

.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option).selected {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option).selected:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    color: white;
}

/* 第一个选项（默认选项）特殊样式 */
.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option):first-child {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: #64748b;
    font-style: italic;
    border-bottom: 2px solid #e2e8f0;
}

.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option):first-child:hover {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    color: #475569;
}

.lms-select-option:not(.lms-custom-select[data-target="lms-category-filter"] .lms-select-option):not(.lms-custom-select[data-target="lms-sort-filter"] .lms-select-option):first-child.selected {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    font-style: normal;
}

/* 下拉菜单打开时的头部样式 */
.lms-custom-select.active .lms-select-header {
    border-color: #3b82f6;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 
        0 0 0 4px rgba(59, 130, 246, 0.1),
        0 8px 25px -5px rgba(59, 130, 246, 0.2),
        0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
    border-radius: 16px 16px 0 0;
    z-index: 1001; /* 确保头部在下拉菜单之上 */
}

.lms-custom-select.active .lms-select-arrow {
    transform: rotate(180deg);
    color: #3b82f6;
}

/* 隐藏原生select */
.lms-hidden-select {
    display: none !important;
}

/* 修复筛选器容器的overflow问题 */
.lms-course-filters {
    overflow: visible !important; /* 确保下拉菜单不被裁剪 */
    margin-bottom: 100px;
    z-index: 80;
}

.lms-filters-container {
    overflow: visible !important; /* 确保下拉菜单不被裁剪 */
}

.lms-filter-group {
    overflow: visible !important; /* 确保下拉菜单不被裁剪 */
}

/* 弹出菜单遮罩层 */
.lms-select-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.lms-select-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    .lms-select-header {
        background: rgba(51, 65, 85, 0.9);
        border-color: #475569;
        color: #f1f5f9;
    }
    
    .lms-select-dropdown {
        background: #374151;
        border-color: #475569;
    }
    
    .lms-select-option {
        color: #f1f5f9;
        border-bottom-color: #4b5563;
    }
    
    .lms-select-option:hover {
        background: linear-gradient(135deg, #4b5563 0%, #6b7280 100%);
        color: #60a5fa;
    }
    
    .lms-select-option.selected {
        background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
        color: white;
    }
    
    .lms-select-option:first-child {
        background: linear-gradient(135deg, #4b5563 0%, #6b7280 100%);
        color: #9ca3af;
        border-bottom-color: #6b7280;
    }
    
    .lms-select-option:first-child:hover {
        background: linear-gradient(135deg, #6b7280 0%, #9ca3af 100%);
        color: #d1d5db;
    }
    
    .lms-custom-select.active .lms-select-header {
        background: rgba(51, 65, 85, 0.95);
        border-color: #60a5fa;
    }
    
    .lms-select-overlay {
        background: rgba(0, 0, 0, 0.7);
    }
    
    .lms-select-dropdown::before {
        color: #f1f5f9;
        border-bottom-color: #4b5563;
    }
}

/* 移动端优化 */
@media (max-width: 768px) {
    .lms-custom-select[data-target="lms-category-filter"] .lms-select-dropdown {
        width: 95vw;
        max-width: none;
        padding: 20px;
    }
    
    .lms-custom-select[data-target="lms-category-filter"] .lms-select-option {
        width: calc(50% - 12px);
        margin: 6px;
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .lms-custom-select[data-target="lms-sort-filter"] .lms-select-dropdown {
        width: 95vw;
        max-width: none;
        padding: 20px;
    }
    
    .lms-custom-select[data-target="lms-sort-filter"] .lms-select-option {
        width: calc(50% - 16px);
        margin: 8px;
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .lms-select-option {
        padding: 16px 20px;
        font-size: 16px;
        min-height: 48px;
        display: flex;
        align-items: center;
    }
    
    .lms-select-option:hover {
        transform: translateX(2px);
    }
    
    /* 确保移动端下拉菜单也能正常显示 */
    .lms-select-dropdown {
        z-index: 10000; /* 移动端使用更高的z-index */
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .lms-select-header {
        border-width: 3px;
        border-color: #000000;
    }
    
    .lms-select-dropdown {
        border-width: 3px;
        border-color: #000000;
    }
    
    .lms-select-option {
        border-bottom-width: 2px;
        border-bottom-color: #000000;
    }
    
    .lms-select-option:hover {
        background: #0066cc;
        color: #ffffff;
    }
    
    .lms-select-option.selected {
        background: #0066cc;
        color: #ffffff;
        border: 2px solid #000000;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    .lms-select-dropdown,
    .lms-select-header,
    .lms-select-option,
    .lms-select-arrow {
        transition: none;
    }
    
    .lms-select-option:hover {
        transform: none;
    }
}

/* 点击外部关闭下拉菜单 */
.lms-select-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent;
    z-index: 999;
    display: none;
}

.lms-select-overlay.active {
    display: block;
}