/* 全局样式 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: radial-gradient(circle, #A8CABA, #74C69D);
    color: #2E4053;
    line-height: 1.6;
    overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    color: #2E4053;
}
a {
    text-decoration: none;
    color: #D4AF37;
}
a:hover {
    color: #FFA726;
}
.container {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
}
.header {
    background: linear-gradient(135deg, #2E4053, #1A237E);
    color: #fff;
    text-align: center;
    padding: 40px 20px;
}
.header h1 {
    font-size: 3rem;
    margin: 0;
}
.header p {
    font-size: 1.2rem;
    margin-top: 10px;
}
.hero-section {
    position: relative;
    height: 400px;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    margin-top: -40px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent);
}
.hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
}
.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}
.feature-card {
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s ease-in-out;
}
.feature-card:hover {
    transform: translateY(-10px);
}
.feature-card img {
    width: 100%;
    height: auto;
    border-radius: 10px;
}
.feature-card h3 {
    font-size: 1.5rem;
    margin-top: 15px;
}
.article-container {
    background: #F5F5F5;
    border-radius: 20px;
    padding: 40px;
    margin-top: 40px;
}
.article-container h2 {
    color: #2E4053;
}
.code-block {
    background: #2E4053;
    color: #fff;
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
}
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    .hero-section {
        height: 300px;
    }
    .features {
        grid-template-columns: 1fr;
    }
}
@keyframes aurora-move {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}