:root {
        --primary: #1A237E;
        --secondary: #651FFF;
        --accent: #FFAB00;
        --text: #333;
        --light: #f8f9fa;
        --dark: #212529;
    }

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Montserrat', sans-serif;
    }

    body {
        background: var(--light);
        color: var(--text);
        line-height: 1.6;
        overflow-x: hidden;
    }

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

    .header {
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        color: white;
        padding: 100px 0;
        text-align: center;
        position: relative;
        overflow: hidden;
        margin-bottom: 60px;
    }

    .header::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
        opacity: 0.1;
    }

    .header h1 {
        font-size: 3rem;
        margin-bottom: 20px;
        position: relative;
        z-index: 1;
        text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }

    .header p {
        font-size: 1.2rem;
        max-width: 800px;
        margin: 0 auto;
        position: relative;
        z-index: 1;
    }

    .notice {
        background: var(--accent);
        color: var(--dark);
        padding: 15px;
        text-align: center;
        font-weight: bold;
        margin-bottom: 40px;
    }

    .nav {
        display: flex;
        justify-content: center;
        background: rgba(26, 35, 126, 0.9);
        padding: 20px;
        position: sticky;
        top: 0;
        z-index: 1000;
        backdrop-filter: blur(10px);
    }

    .nav a {
        color: white;
        text-decoration: none;
        margin: 0 20px;
        font-weight: 500;
        transition: all 0.3s ease;
        position: relative;
    }

    .nav a:hover {
        color: var(--accent);
    }

    .nav a::after {
        content: '';
        position: absolute;
        bottom: -5px;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--accent);
        transition: width 0.3s ease;
    }

    .nav a:hover::after {
        width: 100%;
    }

    article {
        background: white;
        border-radius: 15px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        padding: 40px;
        margin-bottom: 60px;
    }

    article h2 {
        color: var(--primary);
        font-size: 2rem;
        margin-bottom: 30px;
        position: relative;
    }

    article h2::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 0;
        width: 100px;
        height: 4px;
        background: linear-gradient(90deg, var(--primary), var(--secondary));
        border-radius: 2px;
    }

    article h3 {
        color: var(--secondary);
        font-size: 1.5rem;
        margin: 30px 0 20px;
    }

    article p {
        margin-bottom: 20px;
        font-size: 1.1rem;
    }

    article span {
        color: var(--secondary);
        font-weight: bold;
    }

    pre {
        background: #f5f5f5;
        border-radius: 8px;
        padding: 20px;
        margin: 20px 0;
        overflow: auto;
        border-left: 4px solid var(--accent);
    }

    code {
        font-family: 'Courier New', monospace;
        color: var(--dark);
    }

    .gallery {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 20px;
        margin: 40px 0;
    }

    .gallery img {
        width: 100%;
        height: 300px;
        object-fit: cover;
        border-radius: 10px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .gallery img:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0,0,0,0.2);
    }

    .card-container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px;
        margin: 40px 0;
    }

    .card {
        background: white;
        border-radius: 15px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        padding: 30px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        border: 2px solid transparent;
    }

    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        border-color: var(--accent);
    }

    .footer {
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        color: white;
        padding: 40px 0;
        text-align: center;
    }

    .footer p {
        margin-bottom: 20px;
    }

    .social-icons {
        display: flex;
        justify-content: center;
        gap: 20px;
        margin-top: 20px;
    }

    .social-icons a {
        color: white;
        font-size: 1.5rem;
        transition: color 0.3s ease;
    }

    .social-icons a:hover {
        color: var(--accent);
    }

    @media (max-width: 768px) {
        .header h1 {
            font-size: 2rem;
        }

        .header p {
            font-size: 1rem;
        }

        .nav {
            flex-direction: column;
            align-items: center;
        }

        .nav a {
            margin: 10px 0;
        }

        article {
            padding: 20px;
        }

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

    /* Animation classes */
    @keyframes float {
        0%, 100% { transform: translateY(0); }
        50% { transform: translateY(-20px); }
    }

    .floating {
        animation: float 6s ease-in-out infinite;
    }

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

    .gradient-bg {
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        background-size: 400% 400%;
        animation: gradientAnimation 15s ease infinite;
    }