/* 基本样式 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans SC', Arial, sans-serif;
    background-color: #f0f4f8;
    color: #333;
    line-height: 1.6;
}

a {
    color: #0056b3;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #003580;
}

/* 头部样式 */
header {
    background: linear-gradient(90deg, #0056b3, #004494);
    color: #fff;
    padding: 60px 10%;
    text-align: center;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
}

/* 导航栏 */
nav {
    background: #ffffff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 15px 0;
}

nav li {
    margin: 0 20px;
    position: relative;
}

nav a {
    font-size: 1rem;
    font-weight: 700;
    color: #333;
}

nav a:hover {
    color: #0056b3;
}

/* 容器 */
.container {
    padding: 40px 10%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 关于部分 */
#about {
    margin-bottom: 60px;
    text-align: center;
}

#about h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #0056b3;
}

#about p {
    font-size: 1.1rem;
    color: #555;
}

/* 功能部分 */
#features {
    margin-bottom: 60px;
}

#features h2 {
    font-size: 2.5rem;
    margin-bottom: 40px;
    text-align: center;
    color: #0056b3;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature {
    background: #fff;
    border-radius: 10px;
    padding: 30px 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.feature:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.feature h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #004494;
}

.feature p {
    font-size: 1rem;
    color: #666;
}

/* 下载部分 */
#download {
    margin-bottom: 60px;
    text-align: center;
}

#download h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #0056b3;
}

#download p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #555;
}

.download-buttons a {
    display: inline-block;
    background: #0056b3;
    color: #fff;
    padding: 12px 25px;
    border-radius: 5px;
    margin: 10px;
    font-size: 1rem;
    transition: background 0.3s;
}

.download-buttons a:hover {
    background: #003580;
}

/* 联系我们部分 */
#contact {
    margin-bottom: 60px;
    text-align: center;
}

#contact h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #0056b3;
}

#contact p {
    font-size: 1.1rem;
    color: #555;
}

/* 页脚 */
footer {
    background: #003580;
    color: #fff;
    text-align: center;
    padding: 30px 10%;
}

footer p {
    margin: 5px 0;
    font-size: 1rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    header {
        padding: 40px 5%;
    }

    nav ul {
        flex-direction: column;
    }

    nav li {
        margin: 10px 0;
    }

    .container {
        padding: 20px 5%;
    }

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