/* 全局样式 */
    @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&family=Poppins:wght@400;600&display=swap');

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Roboto', sans-serif;
        background: linear-gradient(135deg, #0A2540, #6C5CE7, #00BFA5);
        color: #fff;
        line-height: 1.6;
    }

    a {
        color: #00BFA5;
        text-decoration: none;
    }

    a[rel="nofollow"] {
        /* 无变化，只确保所有内部链接都有 rel="nofollow" */
    }

    header {
        background: rgba(10, 37, 64, 0.8);
        padding: 20px 40px;
        position: fixed;
        width: 100%;
        top: 0;
        z-index: 1000;
    }

    .logo {
        font-family: 'Poppins', sans-serif;
        font-size: 24px;
        font-weight: 700;
    }

    nav {
        margin-top: 10px;
    }

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

    nav ul li a {
        font-weight: 500;
        transition: color 0.3s ease;
    }

    nav ul li a:hover {
        color: #6C5CE7;
    }

    .hero-section {
        height: 100vh;
        background: radial-gradient(circle, rgba(255, 87, 34,0.8), transparent);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
        padding: 0 20px;
        animation: aurora-move 15s linear infinite;
    }

    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }

    .hero-title {
        font-family: 'Poppins', sans-serif;
        font-size: 48px;
        margin-bottom: 20px;
    }

    .hero-subtitle {
        font-size: 24px;
        max-width: 600px;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 80px 20px 40px;
    }

    .section-title {
        font-family: 'Poppins', sans-serif;
        font-size: 32px;
        margin-bottom: 20px;
        text-align: center;
    }

    .card-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }

    .card {
        background: rgba(255, 255, 255, 0.1);
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    }

    .card h3 {
        margin-bottom: 15px;
        font-size: 24px;
    }

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

    pre {
        background: rgba(0, 0, 0, 0.6);
        padding: 15px;
        border-radius: 8px;
        overflow-x: auto;
        margin: 20px 0;
    }

    code {
        font-family: 'Courier New', Courier, monospace;
        color: #00BFA5;
    }

    .image-container {
        display: flex;
        flex-wrap: wrap;
        gap: 20px;
        margin: 40px 0;
        justify-content: center;
    }

    .image-container img {
        width: 100%;
        max-width: 320px;
        border-radius: 10px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.3);
        transition: transform 0.3s ease;
    }

    .image-container img:hover {
        transform: scale(1.05);
    }

    .annotation {
        text-align: center;
        font-size: 18px;
        margin-top: 40px;
    }

    footer {
        background: rgba(10, 37, 64, 0.9);
        padding: 20px;
        text-align: center;
        font-size: 16px;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        .hero-title {
            font-size: 42px;
        }

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

    @media (max-width: 1200px) {
        .container {
            padding: 60px 20px 30px;
        }

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

        .hero-title {
            font-size: 36px;
        }

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

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

        .hero-title {
            font-size: 32px;
        }

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

    @media (max-width: 768px) {
        .hero-title {
            font-size: 28px;
        }

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

        .card-grid {
            grid-template-columns: 1fr;
        }
    }

    @media (max-width: 480px) {
        header {
            padding: 15px 20px;
        }

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

        .hero-subtitle {
            font-size: 12px;
        }

        nav ul {
            gap: 10px;
        }
    }

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

        .hero-subtitle {
            font-size: 10px;
        }

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