/* 移动端优化样式 */
.mobile-list-item {
    transition: all 0.3s ease;
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 0;
}
.mobile-list-item:last-child {
    border-bottom: none;
}
.mobile-list-item:hover {
    background-color: #f9fafb;
}
.mobile-filter-panel {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}
.mobile-stage-badge {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.mobile-subject-badge {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}
.mobile-grade-badge {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}
.mobile-difficulty-badge {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}
.section-divider {
    border-left: 3px solid #3b82f6;
    padding-left: 0.75rem;
    margin: 1rem 0;
}
.decorative-element {
    position: relative;
    overflow: hidden;
}
.decorative-element::before {
    content: "";
    position: absolute;
    top: -10px;
    right: -10px;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    opacity: 0.1;
}
.mobile-tag {
    transition: all 0.2s ease;
}
.mobile-tag:hover {
    transform: scale(1.05);
}
.list-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.75rem;
}

/* 重新设计的例题区域样式 - 简洁装饰 */
.example-section {
    background-color: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.375rem;
    padding: 0.25rem;
    margin: 0.25rem 0;
    position: relative;
    overflow: hidden;
}
/* 简洁的装饰线 */
.example-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, #10b981, #34d399, #10b981);
}
.example-section::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: #e5e7eb;
}
.example-header {
    display: flex;
    align-items: center;
    margin-bottom: 0.125rem;
    padding: 0.125rem 0;
}
.example-icon {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    background-color: #10b981;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.375rem;
}
.example-icon i {
    color: white;
    font-size: 0.625rem;
}
.example-title {
    font-weight: 500;
    color: #059669;
    font-size: 0.75rem;
}
.example-content {
    line-height: 1.4;
    font-size: 0.75rem;
    color: #374151;
    padding: 0.25rem 0.375rem;
}
.example-content p {
    margin-bottom: 0.125rem;
}
.example-content strong {
    color: #047857;
    font-weight: 500;
}
.example-content em {
    color: #4b5563;
    font-style: italic;
}
.example-content ul, .example-content ol {
    padding-left: 0.75rem;
    margin: 0.125rem 0;
}
.example-content li {
    margin-bottom: 0.0625rem;
}
.example-content code {
    background-color: #e5e7eb;
    padding: 0.0625rem 0.125rem;
    border-radius: 0.125rem;
    font-family: monospace;
    font-size: 0.6875rem;
}
.example-content pre {
    background-color: #f3f4f6;
    padding: 0.25rem;
    border-radius: 0.25rem;
    overflow-x: auto;
    margin: 0.125rem 0;
    font-size: 0.6875rem;
}