/**
 * 移动端TOC样式 - 文章头部可折叠显示
 */

/* 移动端TOC容器 */
.toc-mobile {
    margin: 1.5rem 0;
    background: var(--bg-color, #ffffff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

/* TOC包装器 */
.toc-mobile-wrapper {
    width: 100%;
}

/* TOC头部 */
.toc-mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--bg-secondary, #f8fafc);
    border-bottom: 1px solid var(--border-color, #e2e8f0);
    cursor: pointer;
    user-select: none;
}

.toc-mobile-title {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-color, #2d3748);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toc-icon {
    color: var(--primary-color, #3eaf7c);
    flex-shrink: 0;
}

/* 折叠按钮 */
.toc-mobile-toggle {
    background: none;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
    color: var(--text-light, #64748b);
    transition: all 0.2s ease;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toc-mobile-toggle:hover {
    background: var(--bg-hover, #f1f5f9);
    color: var(--primary-color, #3eaf7c);
}

.toc-mobile-toggle:focus {
    outline: 2px solid var(--primary-color, #3eaf7c);
    outline-offset: 2px;
}

.toc-toggle-icon {
    transition: transform 0.3s ease;
    width: 16px;
    height: 16px;
}

.toc-mobile-toggle.collapsed .toc-toggle-icon {
    transform: rotate(-90deg);
}

/* TOC导航 */
.toc-mobile-nav {
    max-height: 400px;
    overflow-y: auto;
    transition: all 0.3s ease;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

.toc-mobile-nav.collapsed {
    max-height: 0;
    overflow: hidden;
}

/* TOC列表 */
.toc-mobile-list {
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
}

.toc-mobile-item {
    margin: 0;
}

/* TOC链接 */
.toc-mobile-link {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-light, #64748b);
    text-decoration: none;
    font-size: 0.875rem;
    line-height: 1.4;
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
    word-break: break-word;
    touch-action: manipulation;
}

.toc-mobile-link:hover {
    color: var(--primary-color, #3eaf7c);
    background: var(--bg-hover, #f1f5f9);
    border-left-color: var(--primary-color, #3eaf7c);
}

.toc-mobile-link.active {
    color: var(--primary-color, #3eaf7c);
    background: var(--primary-bg, #f0f9ff);
    border-left-color: var(--primary-color, #3eaf7c);
    font-weight: 500;
}

/* 不同级别的标题缩进 */
.toc-level-1 .toc-mobile-link {
    padding-left: 1rem;
    font-weight: 600;
}

.toc-level-2 .toc-mobile-link {
    padding-left: 1.5rem;
}

.toc-level-3 .toc-mobile-link {
    padding-left: 2rem;
    font-size: 0.8125rem;
}

.toc-level-4 .toc-mobile-link {
    padding-left: 2.5rem;
    font-size: 0.8125rem;
}

.toc-level-5 .toc-mobile-link {
    padding-left: 3rem;
    font-size: 0.75rem;
}

.toc-level-6 .toc-mobile-link {
    padding-left: 3.5rem;
    font-size: 0.75rem;
}

/* 平板端样式调整 */
@media (min-width: 768px) and (max-width: 1199px) {
    .toc-mobile {
        margin: 2rem 0;
    }
    
    .toc-mobile-header {
        padding: 1.25rem;
    }
    
    .toc-mobile-title {
        font-size: 1rem;
    }
    
    .toc-mobile-link {
        padding: 0.875rem 1.25rem;
        font-size: 0.9375rem;
    }
    
    .toc-level-1 .toc-mobile-link {
        padding-left: 1.25rem;
    }
    
    .toc-level-2 .toc-mobile-link {
        padding-left: 1.75rem;
    }
    
    .toc-level-3 .toc-mobile-link {
        padding-left: 2.25rem;
    }
    
    .toc-level-4 .toc-mobile-link {
        padding-left: 2.75rem;
    }
    
    .toc-level-5 .toc-mobile-link {
        padding-left: 3.25rem;
    }
    
    .toc-level-6 .toc-mobile-link {
        padding-left: 3.75rem;
    }
}

/* 桌面端隐藏 */
@media (min-width: 1200px) {
    .toc-mobile {
        display: none;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    .toc-mobile {
        --bg-color: #1a202c;
        --bg-secondary: #2d3748;
        --bg-hover: #2d3748;
        --border-color: #4a5568;
        --text-color: #e2e8f0;
        --text-light: #a0aec0;
        --primary-color: #68d391;
        --primary-bg: #1a365d;
    }
}

/* 自定义深色模式类 */
.dark .toc-mobile,
.toc-mobile.dark-theme {
    --bg-color: #1a202c;
    --bg-secondary: #2d3748;
    --bg-hover: #2d3748;
    --border-color: #4a5568;
    --text-color: #e2e8f0;
    --text-light: #a0aec0;
    --primary-color: #68d391;
    --primary-bg: #1a365d;
}

/* data-theme="dark" 支持 */
[data-theme="dark"] .toc-mobile {
    --bg-color: #1a202c;
    --bg-secondary: #2d3748;
    --bg-hover: #2d3748;
    --border-color: #4a5568;
    --text-color: #e2e8f0;
    --text-light: #a0aec0;
    --primary-color: #68d391;
    --primary-bg: #1a365d;
}

/* 动画效果 */
.toc-mobile-link {
    position: relative;
    overflow: hidden;
}

.toc-mobile-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0;
    background: var(--primary-color, #3eaf7c);
    opacity: 0.1;
    transition: width 0.3s ease;
}

.toc-mobile-link:hover::before,
.toc-mobile-link.active::before {
    width: 100%;
}

/* 触摸优化 */
@media (hover: none) and (pointer: coarse) {
    .toc-mobile-link {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .toc-mobile-toggle {
        padding: 0.5rem;
        min-width: 44px;
        min-height: 44px;
    }
    
    .toc-toggle-icon {
        width: 20px;
        height: 20px;
    }
}

/* 无障碍支持 */
.toc-mobile-toggle:focus-visible {
    outline: 2px solid var(--primary-color, #3eaf7c);
    outline-offset: 2px;
}

.toc-mobile-link:focus-visible {
    outline: 2px solid var(--primary-color, #3eaf7c);
    outline-offset: -2px;
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    .toc-mobile-nav,
    .toc-toggle-icon,
    .toc-mobile-link,
    .toc-mobile-link::before {
        transition: none;
    }
}

/* 空状态 */
.toc-mobile-empty {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-light, #64748b);
    font-size: 0.875rem;
}

/* 加载状态 */
.toc-mobile-loading {
    padding: 1rem;
    text-align: center;
}

.toc-mobile-loading::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color, #e2e8f0);
    border-top-color: var(--primary-color, #3eaf7c);
    border-radius: 50%;
    animation: toc-spin 1s linear infinite;
}

@keyframes toc-spin {
    to {
        transform: rotate(360deg);
    }
}