/* 导入字体 */
    @import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@700&family=Roboto:wght@400&display=swap');

    /* 重置样式 */
    *, *::before, *::after {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    /* 全局样式 */
    body {
        font-family: 'Roboto', sans-serif;
        color: #ffffff;
        background: linear-gradient(135deg, #1e3c72, #2a5298);
        line-height: 1.6;
        overflow-x: hidden;
    }

    a {
        color: inherit;
        text-decoration: none;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

    /* 容器 */
    .container {
        width: 90%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 40px 0;
    }

    /* 头部样式 */
    header {
        position: fixed;
        top: 0;
        width: 100%;
        background: rgba(0, 0, 0, 0.6);
        padding: 20px 0;
        z-index: 1000;
        transition: background 0.3s ease-in-out;
    }

    header.scrolled {
        background: rgba(0, 0, 0, 0.9);
    }

    .header-container {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .logo {
        font-family: 'Montserrat', sans-serif;
        font-size: 24px;
        font-weight: 700;
        color: #ffffff;
    }

    nav ul {
        list-style: none;
        display: flex;
        gap: 20px;
    }

    nav ul li a {
        font-family: 'Montserrat', sans-serif;
        font-weight: 700;
        color: #ffffff;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: #f39c12;
    }

    /* 英雄区样式 */
    .hero {
        height: 100vh;
        background: linear-gradient(135deg, #1e3c72, #2a5298);
        display: flex;
        justify-content: center;
        align-items: center;
        text-align: center;
        position: relative;
        overflow: hidden;
    }

    .hero::before {
        content: "";
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
        animation: rotate 20s linear infinite;
    }

    @keyframes rotate {
        from {
            transform: rotate(0deg);
        }
        to {
            transform: rotate(360deg);
        }
    }

    .hero-content {
        position: relative;
        z-index: 1;
    }

    .hero h1 {
        font-family: 'Montserrat', sans-serif;
        font-size: 48px;
        margin-bottom: 20px;
        background: linear-gradient(135deg, #ff7e5f, #feb47b);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .hero p {
        font-size: 24px;
        max-width: 600px;
        margin: 0 auto;
    }

    /* 主体内容样式 */
    section {
        padding: 80px 0;
    }

    .section-title {
        text-align: center;
        font-family: 'Montserrat', sans-serif;
        font-size: 32px;
        margin-bottom: 40px;
        position: relative;
    }

    .section-title::after {
        content: "";
        width: 100px;
        height: 4px;
        background: #ff7e5f;
        display: block;
        margin: 10px auto 0;
    }

    .features {
        display: flex;
        flex-wrap: wrap;
        gap: 40px;
        justify-content: center;
    }

    .feature {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        flex: 1 1 300px;
        text-align: center;
        transition: transform 0.3s ease;
    }

    .feature:hover {
        transform: translateY(-10px);
    }

    .feature img {
        width: 80px;
        height: 80px;
        margin-bottom: 20px;
    }

    .feature h3 {
        font-family: 'Montserrat', sans-serif;
        font-size: 24px;
        margin-bottom: 10px;
    }

    .feature p {
        font-size: 16px;
        color: #dddddd;
    }

    /* 示例数据展示 */
    .example-data {
        background: rgba(0, 0, 0, 0.7);
        padding: 40px;
        border-radius: 10px;
        margin: 40px 0;
    }

    .example-data h2 {
        font-family: 'Montserrat', sans-serif;
        font-size: 28px;
        margin-bottom: 20px;
        text-align: center;
    }

    .example-data ul {
        list-style: disc;
        padding-left: 20px;
        color: #ffffff;
    }

    .example-data ul li {
        margin-bottom: 10px;
        font-size: 16px;
    }

    /* 示例文章样式 */
    .example-article {
        background: rgba(255, 255, 255, 0.1);
        padding: 40px;
        border-radius: 10px;
        margin: 40px 0;
        color: #ffffff;
    }

    .example-article h2 {
        font-family: 'Montserrat', sans-serif;
        font-size: 28px;
        margin-bottom: 20px;
    }

    .example-article h3 {
        font-family: 'Montserrat', sans-serif;
        font-size: 22px;
        margin: 20px 0;
    }

    .example-article p {
        font-size: 16px;
        margin-bottom: 20px;
    }

    .example-article pre {
        background: #2a5298;
        padding: 20px;
        border-radius: 5px;
        overflow-x: auto;
    }

    .example-article code {
        font-family: 'Roboto Mono', monospace;
        color: #f1c40f;
    }

    /* 按钮样式 */
    .btn {
        display: inline-block;
        padding: 12px 24px;
        background: #ff7e5f;
        color: #ffffff;
        font-family: 'Montserrat', sans-serif;
        font-weight: 700;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        transition: background 0.3s ease, transform 0.3s ease;
    }

    .btn:hover {
        background: #feb47b;
        transform: scale(1.05);
    }

    /* 警示区域样式 */
    .alert {
        background: linear-gradient(135deg, #ff0000, #ff7e5f);
        padding: 20px;
        border-radius: 10px;
        margin: 20px 0;
        animation: pulse 2s infinite;
    }

    @keyframes pulse {
        0% {
            transform: scale(1);
            opacity: 1;
        }
        50% {
            transform: scale(1.05);
            opacity: 0.7;
        }
        100% {
            transform: scale(1);
            opacity: 1;
        }
    }

    /* 数据可视化图表样式 */
    .data-visualization {
        background: rgba(255, 255, 255, 0.1);
        padding: 40px;
        border-radius: 10px;
        margin: 40px 0;
        text-align: center;
    }

    .data-visualization h3 {
        font-family: 'Montserrat', sans-serif;
        font-size: 24px;
        margin-bottom: 20px;
    }

    /* 模态框样式 */
    .modal {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.8);
        display: none;
        justify-content: center;
        align-items: center;
        z-index: 2000;
    }

    .modal.active {
        display: flex;
    }

    .modal-content {
        background: #ffffff;
        color: #000000;
        padding: 30px;
        border-radius: 10px;
        max-width: 600px;
        width: 90%;
        position: relative;
    }

    .modal-content h2 {
        font-family: 'Montserrat', sans-serif;
        font-size: 24px;
        margin-bottom: 20px;
    }

    .modal-content p {
        font-size: 16px;
        margin-bottom: 20px;
    }

    .close-modal {
        position: absolute;
        top: 15px;
        right: 20px;
        font-size: 24px;
        cursor: pointer;
        color: #333333;
    }

    /* 全屏视频区样式 */
    .video-section {
        position: relative;
        padding: 0;
    }

    .video-section video {
        width: 100%;
        height: auto;
        border-radius: 10px;
    }

    .video-section .video-title {
        position: absolute;
        top: 20px;
        left: 20px;
        background: rgba(0, 0, 0, 0.6);
        padding: 10px 20px;
        border-radius: 5px;
        font-family: 'Montserrat', sans-serif;
        font-size: 20px;
    }

    /* 音效描述样式 */
    .audio-description {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        margin: 20px 0;
        font-size: 16px;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .hero h1 {
            font-size: 40px;
        }

        .hero p {
            font-size: 20px;
        }

        .section-title {
            font-size: 28px;
        }

        .feature h3 {
            font-size: 20px;
        }

        .example-article h2 {
            font-size: 24px;
        }
    }

    @media (max-width: 1200px) {
        .container {
            width: 95%;
        }

        .features {
            gap: 30px;
        }
    }

    @media (max-width: 1024px) {
        .features {
            flex-direction: column;
            align-items: center;
        }

        nav ul {
            flex-direction: column;
            background: rgba(0, 0, 0, 0.9);
            position: absolute;
            top: 60px;
            right: 20px;
            display: none;
            padding: 20px;
            border-radius: 10px;
        }

        nav ul.active {
            display: flex;
        }

        .menu-toggle {
            display: block;
            cursor: pointer;
            font-size: 24px;
            color: #ffffff;
        }
    }

    @media (max-width: 768px) {
        .hero h1 {
            font-size: 32px;
        }

        .hero p {
            font-size: 18px;
        }

        .section-title {
            font-size: 24px;
        }

        .feature h3 {
            font-size: 18px;
        }

        .btn {
            padding: 10px 20px;
            font-size: 14px;
        }

        .example-data ul li,
        .example-article p {
            font-size: 14px;
        }
    }

    @media (max-width: 480px) {
        .hero h1 {
            font-size: 24px;
        }

        .hero p {
            font-size: 16px;
        }

        .section-title {
            font-size: 20px;
        }

        .feature h3 {
            font-size: 16px;
        }

        .example-data ul li,
        .example-article p {
            font-size: 12px;
        }
    }

    @media (max-width: 320px) {
        .hero h1 {
            font-size: 20px;
        }

        .hero p {
            font-size: 14px;
        }

        .section-title {
            font-size: 18px;
        }

        .feature h3 {
            font-size: 14px;
        }

        .example-data ul li,
        .example-article p {
            font-size: 10px;
        }
    }

    /* 提示样式 */
    .design-reference {
        position: fixed;
        bottom: 10px;
        right: 10px;
        background: rgba(0, 0, 0, 0.6);
        color: #ffffff;
        padding: 10px 20px;
        border-radius: 20px;
        font-size: 14px;
        font-family: 'Roboto', sans-serif;
    }