/* 全局样式定义 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #6A5ACD, #1E90FF);
    color: white;
    line-height: 1.6;
    overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6 {
    font-weight: bold;
    color: #FF7F50;
}
p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
}
a {
    color: #FF7F50;
    text-decoration: none;
    transition: color 0.3s ease-in-out;
}
a:hover {
    color: #FFA07A;
}
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 144, 255, 0.8);
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}
header nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}
header nav ul li {
    margin-right: 20px;
}
header nav ul li a {
    padding: 10px 15px;
    border-radius: 5px;
}
header nav ul li a:hover {
    background: #FF7F50;
    color: white;
}
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5));
}
.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.hero p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    padding: 60px 0;
    background: #1E90FF;
}
.feature-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}
.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}
.feature-item img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 15px;
}
.cta-section {
    background: #FF7F50;
    color: white;
    text-align: center;
    padding: 50px 0;
}
.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}
.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}
.cta-section button {
    background: #1E90FF;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s ease-in-out, background 0.3s ease-in-out;
}
.cta-section button:hover {
    background: #6A5ACD;
    transform: scale(1.1);
}
footer {
    background: #1E90FF;
    color: white;
    text-align: center;
    padding: 30px 0;
}
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    .hero p {
        font-size: 1.2rem;
    }
    header nav ul {
        flex-direction: column;
        align-items: center;
    }
    header nav ul li {
        margin: 10px 0;
    }
}