:root {
        --primary: #0D2861;
        --secondary: #652CDF;
        --accent: #34C759;
        --text: #333;
        --light: #fff;
        --dark: #121212;
        --gray: #e0e0e0;
    }

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

    body {
        background-color: #f8f9fa;
        color: var(--text);
        line-height: 1.6;
        overflow-x: hidden;
    }

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

    .header {
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        color: var(--light);
        padding: 2rem;
        border-radius: 0 0 20px 20px;
        box-shadow: 0 10px 30px rgba(13, 40, 97, 0.2);
        margin-bottom: 3rem;
        position: relative;
        overflow: hidden;
    }

    .header::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('https://images.gptkong.com/demo/sample1.png') center/cover;
        opacity: 0.1;
    }

    .header h1 {
        font-size: 2.5rem;
        margin-bottom: 1rem;
        position: relative;
        text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }

    .header p {
        font-size: 1.2rem;
        opacity: 0.9;
        max-width: 800px;
        position: relative;
    }

    .notice {
        background: rgba(255,255,255,0.2);
        padding: 10px 20px;
        border-radius: 50px;
        display: inline-block;
        margin-top: 1rem;
        backdrop-filter: blur(5px);
        font-size: 0.9rem;
    }

    .grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
        gap: 2rem;
        margin-bottom: 3rem;
    }

    .card {
        background: var(--light);
        border-radius: 12px;
        padding: 2rem;
        box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .card:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    }

    .card::after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 5px;
        background: linear-gradient(90deg, var(--primary), var(--secondary));
    }

    .card h2 {
        color: var(--primary);
        margin-bottom: 1rem;
        font-size: 1.5rem;
    }

    .card h3 {
        color: var(--secondary);
        margin: 1.5rem 0 1rem;
        font-size: 1.2rem;
    }

    .card p {
        margin-bottom: 1.5rem;
    }

    .card-img {
        width: 100%;
        height: 200px;
        object-fit: cover;
        border-radius: 8px;
        margin: 1rem 0;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        transition: transform 0.3s ease;
    }

    .card-img:hover {
        transform: scale(1.02);
    }

    pre {
        background: #f5f7fa;
        padding: 1.5rem;
        border-radius: 8px;
        overflow-x: auto;
        margin: 1.5rem 0;
        position: relative;
        border-left: 4px solid var(--accent);
    }

    code {
        font-family: 'Courier New', monospace;
        color: #333;
    }

    .particles {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        pointer-events: none;
        z-index: -1;
    }

    .particle {
        position: absolute;
        width: 2px;
        height: 2px;
        background-color: rgba(101, 44, 223, 0.5);
        border-radius: 50%;
        animation: moveParticles 15s linear infinite;
    }

    @keyframes moveParticles {
        0% {
            transform: translate(0, 0);
        }
        100% {
            transform: translate(100vw, 100vh);
        }
    }

    .footer {
        text-align: center;
        padding: 2rem;
        margin-top: 3rem;
        background: linear-gradient(135deg, var(--primary), var(--secondary));
        color: var(--light);
        border-radius: 20px 20px 0 0;
    }

    @media (max-width: 768px) {
        .grid {
            grid-template-columns: 1fr;
        }
        
        .header h1 {
            font-size: 2rem;
        }
    }

    /* Additional animations */
    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .fade-in {
        animation: fadeInUp 0.6s forwards;
    }

    span[style*="color"] {
        font-weight: bold;
        padding: 2px 5px;
        border-radius: 3px;
        background: rgba(0,0,0,0.05);
    }