/* TOC 侧边栏样式 */
.toc-sidebar {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 280px;
    max-height: 70vh;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid #e1e4e8;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    overflow-y: auto;
}

/* 桌面端折叠状态 */
.toc-sidebar.collapsed {
    width: 50px !important;
    height: 50px !important;
    padding: 0 !important;
    overflow: hidden !important;
    cursor: pointer;
}

.toc-sidebar.collapsed .toc-header,
.toc-sidebar.collapsed .toc-content {
    display: none !important;
}

.toc-sidebar.collapsed::before {
    content: '≡' !important;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5em;
    cursor: pointer;
}

/* 移动端基础状态（按钮模式） */
@media (max-width: 768px) {
    .toc-sidebar {
        position: fixed;
        left: 10px;
        bottom: 20px;
        top: auto;
        transform: none;
        width: 50px !important;
        height: 50px !important;
        padding: 0 !important;
        overflow: hidden !important;
        cursor: pointer;
    }
    
    .toc-sidebar .toc-header,
    .toc-sidebar .toc-content {
        display: none !important;
    }
    
    /* 移动端按钮样式 */
    .toc-sidebar::before {
        content: '≡' !important;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        font-size: 1.5em;
        cursor: pointer;
        z-index: 1001;
    }
    
    /* 移动端展开状态 */
    .toc-sidebar.expanded {
        width: calc(100vw - 40px) !important;
        height: 60vh !important;
        padding: 20px !important;
        overflow-y: auto !important;
        bottom: 20px;
        left: 20px;
        cursor: default;
    }
    
    .toc-sidebar.expanded::before {
        display: none !important;
    }
    
    .toc-sidebar.expanded .toc-header,
    .toc-sidebar.expanded .toc-content {
        display: block !important;
    }
    
    .toc-sidebar.expanded .toc-toggle {
        display: block !important;
        position: absolute;
        top: 10px;
        right: 10px;
        z-index: 1002;
    }
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

.toc-title {
    font-size: 1.1em;
    font-weight: 600;
    color: #2c3e50;
    margin: 0;
}

.toc-toggle {
    background: none;
    border: none;
    font-size: 1.2em;
    cursor: pointer;
    color: #666;
    padding: 5px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.toc-toggle:hover {
    background: #f0f0f0;
    color: #3498db;
}

.toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-item {
    margin: 5px 0;
}

.toc-link {
    display: block;
    padding: 8px 12px;
    text-decoration: none;
    color: #555;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 0.9em;
    line-height: 1.4;
    border-left: 3px solid transparent;
}

.toc-link:hover, .toc-link.active {
    background: #f8f9fa;
    color: #3498db;
    border-left-color: #3498db;
}

/* 层级缩进 */
.toc-level-2 { padding-left: 15px; }
.toc-level-3 { padding-left: 30px; }
.toc-level-4 { padding-left: 45px; }
.toc-level-5 { padding-left: 60px; }
.toc-level-6 { padding-left: 75px; }

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    .toc-sidebar {
        background: rgba(45, 45, 45, 0.95);
        border-color: #444;
    }
    
    .toc-title {
        color: #ffffff;
    }
    
    .toc-link {
        color: #e8e8e8;
    }
    
    .toc-link:hover, .toc-link.active {
        background: #3d3d3d;
        color: #4fc3f7;
    }
    
    .toc-toggle {
        color: #b8b8b8;
    }
    
    .toc-toggle:hover {
        background: #4d4d4d;
        color: #4fc3f7;
    }
}

/* 滚动条样式 */
.toc-sidebar::-webkit-scrollbar {
    width: 6px;
}

.toc-sidebar::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.toc-sidebar::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 3px;
}

@media (prefers-color-scheme: dark) {
    .toc-sidebar::-webkit-scrollbar-track {
        background: #3d3d3d;
    }
    
    .toc-sidebar::-webkit-scrollbar-thumb {
        background: #666;
    }
}