/* 全局样式定义 */
body {
    margin: 0;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #0074D9, #6a11cb);
    color: #fff;
    line-height: 1.6;
    overflow-x: hidden;
}

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

.hero-section {
    position: relative;
    height: 100vh;
    background: radial-gradient(circle, rgba(0,116,217,0.8), transparent),
                url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.hero-section h1 {
    font-size: 4rem;
    text-shadow: 2px 2px 10px rgba(0,0,0,0.3);
    animation: fadeIn 3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

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

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

.feature-card img {
    width: 80px;
    height: 80px;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: #FFA500;
}

.article-section {
    background: linear-gradient(to bottom, #f5f7fa, #c3cfe2);
    color: #333;
    padding: 40px 20px;
    border-radius: 20px;
    margin-top: 40px;
}

.article-section pre {
    background: #2d2d2d;
    color: #fff;
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}