/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

body {
    display: grid;
    grid-template-areas:
        "header header"
        "sidebar main";
    grid-template-rows: 70px 1fr;
    grid-template-columns: 250px 1fr;
    height: 100vh;
    background-color: #fafafa;
    color: #333;
}

a:hover {
    text-decoration-line: none;
}

/* 顶部标题栏 */
header {
    grid-area: header;
    background-color: #ffffff;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 25px;
    overflow:hidden;
}

.header-left {
    display: flex;
    align-items: center;
    cursor:pointer;
}

.header-right {
    width: 80rem;
    height: 4rem;
    text-align: right;
    padding: 13px;
}

.logo-icon {
    width: 40px;
    margin-right: 12px;
}

.header-title {
    font-size: 20px;
    font-weight: 400;
    color: #444;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    min-width:220px;
}

.login-btn {
    background-color: #FC5356;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s;
}

    .login-btn:hover {
        background-color: #FC6656;
    }

/* 用户信息按钮样式 */
.user-info-btn {
    background-color: white;
    color: #333;
    padding: 6px 12px;
    display: inline-flex;
    align-items: center;
    height: 38px; /* 与login-btn高度一致 */
}

/* 头像容器 */
.avatar-container {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    overflow: hidden;
    margin-right: 8px;
    border: 1px solid #e0e0e0;
}

.user-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-name {
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px; /* 限制用户名最大宽度 */
}

/*顶部菜单点击按钮*/
.top-menu-btn {
    width: 6rem;
    height: 1.8rem;
    text-align: center;
    line-height: 1.6rem;
    border: 0.1rem solid;
    margin-left: 2.8rem;
    border-radius: 0.3rem;
}

/* 左侧菜单栏 */
.sidebar {
    grid-area: sidebar;
    background-color: #ffffff;
    padding: 25px 0;
    border-right: 1px solid #f0f0f0;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 15px;
}

.menu-button {
    padding: 16px 20px;
    background-color: transparent;
    border: none;
    border-radius: 6px;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #555;
    font-size: 15px;
    height: 52px;
    display: flex;
    align-items: center;
}

    .menu-button:hover {
        background-color: #f5f5f5;
        color: #333;
        border: none;
    }

    .menu-button.active {
        background-color: #f0f0f0;
        color: #222;
        font-weight: 500;
        border: none;
        border: none;
    }

.menu-icon {
    width: 24px;
    height: 24px;
    margin-right: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 16px;
}

.menu-button.active .menu-icon {
    color: #444;
}

.menu-divider {
    height: 1px;
    background-color: #eee;
    margin: 16px 0;
}

/* 备案号 */
.menu-reserved {
    margin-top: -20px;
    padding-left: 25px;
    color: #555;
    font-size: 15px;
}


/* 主内容区 */
.main-content {
    padding: 30px;
    background-color: #fafafa;
    overflow-y: auto;
}

.content-card {
    background-color: #fff;
    border-radius: 10px;
    padding: 25px;
    border: 1px solid #eee;
    margin-bottom: 25px;
}

.card-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 18px;
    color: #444;
}

.card-content {
    color: #666;
    line-height: 1.6;
    font-size: 15px;
}

/*登录框样式*/

/* 遮罩层样式 */
.mask {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    position: fixed;
    z-index: 999;
    display: none;
    justify-content: center;
    align-items: center;
}

/* 登录框容器 */
.login-container {
    display: flex;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%); /* 使用 transform 属性进行居中 */
    width: 700px;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 关闭按钮 */
.close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.3s;
    z-index: 1;
}

    .close-btn:hover {
        opacity: 1;
    }

    .close-btn::before, .close-btn::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 20px;
        height: 2px;
        background-color: #999;
    }

    .close-btn::before {
        transform: translate(-50%, -50%) rotate(45deg);
    }

    .close-btn::after {
        transform: translate(-50%, -50%) rotate(-45deg);
    }

/* 左侧广告区 */
.ad-section {
    width: 45%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

    .ad-section img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

/* 右侧登录区 */
.login-section {
    float: right;
    width: 55%;
    height: 100%;
    padding: 60px 40px;
    position: relative;
}

/* 登录方式切换 */
.login-tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 1px solid #eee;
}

.login-tab {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
    color: #666;
    position: relative;
}

    .login-tab.active {
        color: #06f;
        font-weight: bold;
    }

        .login-tab.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #06f;
        }

/* 登录内容区 */
.login-content {
    display: none;
}

    .login-content.active {
        display: block;
    }

/* 微信扫码登录 */
.qrcode-container {
    text-align: center;
    padding: 10px 0;
}

    .qrcode-container img {
        width: 160px;
        height: 160px;
        margin-bottom: 10px;
        border: 1px solid #eee;
    }

    .qrcode-container p {
        color: #666;
        font-size: 14px;
        margin-bottom: 10px;
    }

/* 手机验证码登录 */
.phone-login-form {
    padding: 10px 0;
}

.form-group {
    margin-bottom: 20px;
}

    .form-group label {
        display: block;
        margin-bottom: 8px;
        color: #666;
        font-size: 14px;
    }

    .form-group input {
        width: 100%;
        padding: 12px 15px;
        border: 1px solid #ddd;
        border-radius: 4px;
        font-size: 14px;
        outline: none;
        transition: border-color 0.3s;
    }

        .form-group input:focus {
            border-color: #06f;
        }

.code-group {
    display: flex;
}

    .code-group input {
        flex: 1;
        margin-right: 10px;
    }

    .code-group button {
        padding: 0 15px;
        background-color: #06f;
        color: white;
        border: none;
        border-radius: 4px;
        cursor: pointer;
        font-size: 14px;
        transition: background-color 0.3s;
    }

        .code-group button:hover {
            background-color: #0052d9;
        }

        .code-group button:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }

/*手机号登录按钮样式*/
.phone-login-btn {
    background-color: #FC5356;
    width: 100%;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s;
}

    .phone-login-btn:hover {
        background-color: #FC6656;
    }

/* 底部链接，登录底部的用户隐私协议 */
.login-footer {
    font-size: 12px;
    color: #999;
    margin-top: 5px;
}

    .login-footer a {
        color: #FC5356;
        text-decoration: none;
    }

        .login-footer a:hover {
            text-decoration-line: none;
        }

/* AI前沿 */

.ai-hot-btn {
    background-color: #F0F0F0;
    color: #000;
    border: none;
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.ai-hot-active-btn {
    background-color: #FC5356;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 13px;
    cursor: pointer;
    transition: background-color 0.2s;
}

/*蓝色按钮样式示例，用到的时候可以使用*/
.login-btn-example {
    width: 80px;
    padding: 12px;
    background-color: #06f;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s;
}

    .login-btn-example:hover {
        background-color: #0052d9;
    }


/* AI 教程平台 - AI教程和AI教程详情页样式 */

/* 基础变量定义 */
:root {
    --primary-color: #ff4d4f;
    --primary-hover: #ff7875;
    --secondary-color: #1890ff;
    --text-color: #222;
    --text-secondary: #555;
    --text-light: #888;
    --border-color: #e8e8e8;
    --bg-light: #f5f5f5;
    --bg-lighter: #fafafa;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 通用组件样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    color: var(--text-color);
}

    .section-title i {
        color: var(--primary-color);
        margin-right: 8px;
        font-size: 16px;
    }

.btn {
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

    .btn:hover {
        transform: translateY(-1px);
    }

.card {
    background-color: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

    .card:hover {
        transform: translateY(-5px);
        box-shadow: var(--shadow-md);
    }

/* 视频列表页样式 */
.ai-tutorial-list .top-section {
    width: 100%;
    height: 300px;
    background: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #333;
    text-align: center;
    padding: 20px;
    border-bottom: 1px solid #f0f0f0;
}

    .ai-tutorial-list .top-section .banner-title {
        font-size: 36px;
        font-weight: bold;
        margin-bottom: 20px;
    }

    .ai-tutorial-list .top-section .banner-subtitle {
        font-size: 18px;
        margin-bottom: 30px;
        color: #666;
    }

.ai-tutorial-list .search-box {
    width: 100%;
    max-width: 600px;
    height: 50px;
    position: relative;
}

    .ai-tutorial-list .search-box .search-input {
        width: 100%;
        height: 100%;
        border: 1px solid #ddd;
        border-radius: 25px;
        padding: 0 60px 0 20px;
        outline: none;
        font-size: 16px;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    }

        .ai-tutorial-list .search-box .search-input:focus {
            border-color: var(--primary-color);
        }

    .ai-tutorial-list .search-box .search-btn {
        position: absolute;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        color: #666;
        font-size: 20px;
        cursor: pointer;
    }

.ai-tutorial-list .middle-section {
    padding: 40px 20px;
}

.ai-tutorial-list .filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
}

    .ai-tutorial-list .filter-tabs .filter-tab {
        padding: 8px 16px;
        background-color: var(--bg-light);
        border-radius: 20px;
        font-size: 14px;
        cursor: pointer;
        transition: all 0.3s;
    }

        .ai-tutorial-list .filter-tabs .filter-tab:hover {
            background-color: #e0e0e0;
        }

        .ai-tutorial-list .filter-tabs .filter-tab.active {
            background-color: var(--primary-color);
            color: white;
        }

.ai-tutorial-list .video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.ai-tutorial-list .video-card {
    background-color: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #eee;
}

    .ai-tutorial-list .video-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    }

    .ai-tutorial-list .video-card .video-cover {
        width: 100%;
        height: 160px;
        background-color: var(--bg-light);
        position: relative;
        overflow: hidden;
    }

        .ai-tutorial-list .video-card .video-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .ai-tutorial-list .video-card .video-cover .video-duration {
            position: absolute;
            right: 8px;
            bottom: 8px;
            background-color: rgba(0, 0, 0, 0.7);
            color: white;
            font-size: 12px;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
        }

    .ai-tutorial-list .video-card .video-info {
        padding: 16px;
    }

        .ai-tutorial-list .video-card .video-info .video-title {
            font-size: 16px;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            line-height: 1.4;
            height: 44px;
            color: var(--text-color);
        }

        .ai-tutorial-list .video-card .video-info .video-meta {
            font-size: 13px;
            color: var(--text-secondary);
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

            .ai-tutorial-list .video-card .video-info .video-meta .video-author {
                display: flex;
                align-items: center;
            }

                .ai-tutorial-list .video-card .video-info .video-meta .video-author img {
                    width: 24px;
                    height: 24px;
                    border-radius: 50%;
                    margin-right: 6px;
                    object-fit: cover;
                }

            .ai-tutorial-list .video-card .video-info .video-meta .video-stats {
                display: flex;
                justify-content: space-between;
                align-items: center;
            }

                .ai-tutorial-list .video-card .video-info .video-meta .video-stats .video-time {
                    color: var(--text-light);
                    font-size: 12px;
                }

                .ai-tutorial-list .video-card .video-info .video-meta .video-stats .video-views {
                    display: flex;
                    align-items: center;
                }

                    .ai-tutorial-list .video-card .video-info .video-meta .video-stats .video-views i {
                        margin-right: 4px;
                        font-size: 12px;
                    }

.ai-tutorial-list .load-more {
    display: block;
    width: 200px;
    margin: 0 auto;
    padding: 12px 24px;
    background-color: #fff;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s;
}

    .ai-tutorial-list .load-more:hover {
        background-color: var(--bg-light);
        border-color: #ccc;
    }

.ai-tutorial-list .bottom-section {
    background-color: var(--bg-lighter);
    padding: 60px 20px;
    text-align: center;
    border-top: 1px solid #eee;
}

    .ai-tutorial-list .bottom-section .feature-container {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 40px;
    }

        .ai-tutorial-list .bottom-section .feature-container .feature-card {
            background-color: white;
            border-radius: var(--radius-md);
            padding: 30px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s;
            border: 1px solid #eee;
        }

            .ai-tutorial-list .bottom-section .feature-container .feature-card:hover {
                transform: translateY(-5px);
            }

            .ai-tutorial-list .bottom-section .feature-container .feature-card .feature-icon {
                font-size: 40px;
                color: var(--primary-color);
                margin-bottom: 20px;
            }

            .ai-tutorial-list .bottom-section .feature-container .feature-card .feature-title {
                font-size: 20px;
                font-weight: bold;
                margin-bottom: 15px;
                color: var(--text-color);
            }

            .ai-tutorial-list .bottom-section .feature-container .feature-card .feature-desc {
                font-size: 15px;
                color: var(--text-secondary);
                line-height: 1.6;
            }

    .ai-tutorial-list .bottom-section .footer {
        margin-top: 60px;
        color: var(--text-light);
        font-size: 14px;
    }

/* 视频详情页样式 */
.ai-tutorial-detail .video-detail-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

.ai-tutorial-detail .video-info-above {
    padding: 16px 0;
    margin-bottom: 12px;
}

.ai-tutorial-detail .video-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 12px;
}

    .ai-tutorial-detail .video-header .video-title-container {
        flex: 1;
        min-width: 0;
    }

        .ai-tutorial-detail .video-header .video-title-container .video-title {
            font-size: 24px;
            font-weight: 600;
            color: var(--text-color);
            margin: 0 0 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            max-height: 3.2em;
        }

        .ai-tutorial-detail .video-header .video-title-container .video-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

            .ai-tutorial-detail .video-header .video-title-container .video-meta .upload-date,
            .ai-tutorial-detail .video-header .video-title-container .video-meta .view-count {
                color: var(--text-light);
                font-size: 14px;
            }

                .ai-tutorial-detail .video-header .video-title-container .video-meta .view-count i {
                    margin-right: 6px;
                    color: var(--text-light);
                }

            .ai-tutorial-detail .video-header .video-title-container .video-meta .copyright-notice {
                color: var(--text-light);
                font-size: 13px;
                display: flex;
                align-items: center;
                gap: 4px;
            }

                .ai-tutorial-detail .video-header .video-title-container .video-meta .copyright-notice i {
                    font-size: 12px;
                    color: var(--text-light);
                }

.ai-tutorial-detail .video-player-container {
    background-color: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 20px;
    position: relative;
    box-shadow: var(--shadow-md);
}

    .ai-tutorial-detail .video-player-container .video-player {
        width: 100%;
        height: 0;
        padding-bottom: 56.25%;
        position: relative;
    }

        .ai-tutorial-detail .video-player-container .video-player video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

    .ai-tutorial-detail .video-player-container .video-controls {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
        padding: 10px 16px;
        display: flex;
        align-items: center;
        opacity: 0;
        transition: var(--transition);
    }

    .ai-tutorial-detail .video-player-container:hover .video-controls {
        opacity: 1;
    }

    .ai-tutorial-detail .video-player-container .video-controls .control-btn {
        background: none;
        border: none;
        color: white;
        font-size: 16px;
        cursor: pointer;
        margin: 0 4px;
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        transition: var(--transition);
    }

        .ai-tutorial-detail .video-player-container .video-controls .control-btn:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: scale(1.1);
        }

    .ai-tutorial-detail .video-player-container .video-controls .progress-container {
        flex-grow: 1;
        height: 4px;
        background-color: rgba(255,255,255,0.3);
        margin: 0 12px;
        border-radius: 2px;
        cursor: pointer;
        position: relative;
    }

        .ai-tutorial-detail .video-player-container .video-controls .progress-container .progress-bar {
            height: 100%;
            background-color: var(--primary-color);
            border-radius: 2px;
            width: 0%;
            position: relative;
            transition: width 0.1s linear;
        }

            .ai-tutorial-detail .video-player-container .video-controls .progress-container .progress-bar::after {
                content: '';
                position: absolute;
                right: 0;
                top: 50%;
                transform: translate(50%, -50%);
                width: 12px;
                height: 12px;
                background-color: var(--primary-color);
                border-radius: 50%;
                opacity: 0;
                transition: var(--transition);
            }

        .ai-tutorial-detail .video-player-container .video-controls .progress-container:hover .progress-bar::after {
            opacity: 1;
        }

    .ai-tutorial-detail .video-player-container .video-controls .time-display {
        color: white;
        font-size: 12px;
        margin: 0 8px;
        white-space: nowrap;
        font-family: monospace;
    }

.ai-tutorial-detail .video-info-below {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-top: 12px;
}

    .ai-tutorial-detail .video-info-below .video-author {
        display: flex;
        align-items: center;
        gap: 10px;
    }

        .ai-tutorial-detail .video-info-below .video-author .video-author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            border: 1px solid var(--border-color);
        }

        .ai-tutorial-detail .video-info-below .video-author .video-author-name {
            font-weight: 500;
            color: var(--text-color);
        }

    .ai-tutorial-detail .video-info-below .video-actions {
        display: flex;
        gap: 12px;
    }

        .ai-tutorial-detail .video-info-below .video-actions .action-btn {
            display: flex;
            align-items: center;
            background-color: var(--bg-light);
            border: none;
            border-radius: 20px;
            padding: 8px 16px;
            cursor: pointer;
            transition: var(--transition);
            font-size: 14px;
            color: var(--text-secondary);
            position: relative;
        }

            .ai-tutorial-detail .video-info-below .video-actions .action-btn:hover {
                background-color: #e8e8e8;
                color: var(--text-color);
                transform: translateY(-1px);
            }

            .ai-tutorial-detail .video-info-below .video-actions .action-btn i {
                margin-right: 6px;
                font-size: 14px;
                transition: var(--transition);
            }

            .ai-tutorial-detail .video-info-below .video-actions .action-btn.view {
                background-color: var(--bg-light);
            }

            .ai-tutorial-detail .video-info-below .video-actions .action-btn.like.active,
            .ai-tutorial-detail .video-info-below .video-actions .action-btn.like.active i,
            .ai-tutorial-detail .video-info-below .video-actions .action-btn.favorite.active,
            .ai-tutorial-detail .video-info-below .video-actions .action-btn.favorite.active i {
                color: var(--primary-color);
            }

            .ai-tutorial-detail .video-info-below .video-actions .action-btn .tooltip {
                position: absolute;
                bottom: 100%;
                left: 50%;
                transform: translateX(-50%);
                background-color: rgba(0, 0, 0, 0.8);
                color: white;
                padding: 6px 10px;
                border-radius: var(--radius-sm);
                font-size: 12px;
                white-space: nowrap;
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                margin-bottom: 8px;
                z-index: 10;
            }

                .ai-tutorial-detail .video-info-below .video-actions .action-btn .tooltip::after {
                    content: '';
                    position: absolute;
                    top: 100%;
                    left: 50%;
                    transform: translateX(-50%);
                    border-width: 5px;
                    border-style: solid;
                    border-color: rgba(0, 0, 0, 0.8) transparent transparent transparent;
                }

            .ai-tutorial-detail .video-info-below .video-actions .action-btn:hover .tooltip {
                opacity: 1;
                transform: translateX(-50%) translateY(-2px);
            }

.ai-tutorial-detail .video-description-container {
    position: relative;
    margin-bottom: 16px;
}

    .ai-tutorial-detail .video-description-container .video-description {
        background-color: var(--bg-lighter);
        padding: 16px;
        border-radius: var(--radius-sm);
        font-size: 14px;
        line-height: 1.7;
        position: relative;
    }

        .ai-tutorial-detail .video-description-container .video-description p {
            margin-bottom: 0;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            transition: -webkit-line-clamp 0.3s ease;
        }

        .ai-tutorial-detail .video-description-container .video-description.expanded p {
            -webkit-line-clamp: unset;
        }

    .ai-tutorial-detail .video-description-container .view-more-btn {
        display: inline-block;
        margin-top: 8px;
        color: var(--primary-color);
        font-weight: 500;
        cursor: pointer;
        transition: var(--transition);
    }

        .ai-tutorial-detail .video-description-container .view-more-btn:hover {
            color: var(--primary-hover);
            text-decoration: underline;
        }

        .ai-tutorial-detail .video-description-container .view-more-btn i {
            margin-left: 4px;
            font-size: 12px;
        }

.ai-tutorial-detail .video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

    .ai-tutorial-detail .video-tags .video-tag {
        background-color: var(--bg-light);
        color: var(--text-secondary);
        padding: 6px 12px;
        border-radius: 15px;
        font-size: 12px;
        transition: var(--transition);
    }

        .ai-tutorial-detail .video-tags .video-tag:hover {
            background-color: #e0e0e0;
            color: var(--primary-color);
        }

.ai-tutorial-detail .related-videos {
    margin-top: 32px;
}

    .ai-tutorial-detail .related-videos .related-video-list {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 16px;
    }

        .ai-tutorial-detail .related-videos .related-video-list .related-video-item {
            background-color: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }

            .ai-tutorial-detail .related-videos .related-video-list .related-video-item:hover {
                transform: translateY(-4px);
                box-shadow: var(--shadow-md);
            }

            .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-cover {
                width: 100%;
                height: 124px;
                position: relative;
                overflow: hidden;
            }

                .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-cover img {
                    width: 100%;
                    height: 100%;
                    object-fit: cover;
                    transition: transform 0.5s ease;
                }

            .ai-tutorial-detail .related-videos .related-video-list .related-video-item:hover .related-video-cover img {
                transform: scale(1.05);
            }

            .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-duration {
                position: absolute;
                right: 8px;
                bottom: 8px;
                background-color: rgba(0, 0, 0, 0.8);
                color: white;
                font-size: 11px;
                padding: 2px 6px;
                border-radius: var(--radius-sm);
            }

            .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info {
                padding: 12px;
            }

                .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-title {
                    font-size: 14px;
                    margin-bottom: 8px;
                    display: -webkit-box;
                    -webkit-line-clamp: 2;
                    -webkit-box-orient: vertical;
                    overflow: hidden;
                    text-overflow: ellipsis;
                    line-height: 1.4;
                    height: 40px;
                    color: var(--text-color);
                    font-weight: 500;
                }

                .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-meta {
                    font-size: 12px;
                    color: var(--text-light);
                    display: flex;
                    flex-direction: column;
                    gap: 4px;
                }

                    .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-meta .related-video-author {
                        display: flex;
                        align-items: center;
                    }

                        .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-meta .related-video-author .related-video-author-avatar {
                            width: 20px;
                            height: 20px;
                            border-radius: 50%;
                            margin-right: 6px;
                            object-fit: cover;
                        }

                    .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-meta .related-video-stats {
                        display: flex;
                        justify-content: space-between;
                        align-items: center;
                    }

                        .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-meta .related-video-stats .related-video-views {
                            display: flex;
                            align-items: center;
                        }

                            .ai-tutorial-detail .related-videos .related-video-list .related-video-item .related-video-info .related-video-meta .related-video-stats .related-video-views i {
                                margin-right: 4px;
                                font-size: 11px;
                            }

/* 响应式调整 */
@media (max-width: 640px) {
    .container {
        padding: 16px;
    }

    .ai-tutorial-list .banner-title,
    .ai-tutorial-detail .video-title {
        font-size: 28px;
    }

    .ai-tutorial-list .banner-subtitle {
        font-size: 16px;
    }

    .ai-tutorial-detail .video-meta {
        gap: 8px;
    }

    .ai-tutorial-detail .video-actions {
        gap: 8px;
    }

    .ai-tutorial-detail .action-btn {
        padding: 6px 12px;
        font-size: 13px;
    }

    .ai-tutorial-detail .related-video-list {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }

    .ai-tutorial-detail .related-video-cover {
        height: 100px;
    }

    .sidebar {
        display: none; /* 在小屏幕上隐藏侧边栏 */
    }

    .main-content {
        width: 640px; /* 在小屏幕上使主内容区占满整个屏幕宽度 */
        height: 100vh;
    }

    .top-menu-btn {
        visibility: visible;
    }

    header {
        width: 640px;
    }
}

/* 针对大屏幕设备（如PC） */
@media (min-width: 780px) {
    .sidebar {
        visibility: visible; /* 在大屏幕上显示侧边栏 */
    }

    .top-menu-btn {
        visibility: hidden;
    }
}

@media (max-width: 480px) {
    .ai-tutorial-detail .video-header {
        flex-direction: column;
        gap: 6px;
    }

    .ai-tutorial-detail .video-info-below {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .ai-tutorial-detail .video-actions {
        width: 100%;
        justify-content: space-between;
    }

    .ai-tutorial-detail .action-btn {
        flex: 1;
        justify-content: center;
    }

    .ai-tutorial-detail .related-video-list {
        grid-template-columns: 1fr;
    }
}