/* 全局样式 */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #3498db;
}

.hero {
    background-image: url('../images/hero_bg.jpg');
    background-size: cover;
    background-position: center;
    height: 450px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.hero-content {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 30px;
    border-radius: 10px;
}

.hero-content h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 18px;
    margin-bottom: 30px;
}

.btn {
    background-color: #3498db;
    color: white;
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #2980b9;
}

.main-features {
    padding: 5px;
    text-align: center;
}

.main-features h2 {
    font-size: 36px;
    margin-bottom: 30px;
}

.feature {
    display: inline-block;
    width: 250px;
    margin: 20px;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-10px);
}

.feature i {
    font-size: 48px;
    color: #3498db;
    margin-bottom: 20px;
}

.feature h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.feature p {
    color: #666;
}

.features {
    padding: 50px;
}

.features h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 30px;
}

.function {
    display: flex;
    align-items: center;
    margin-bottom: 50px;
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.function img {
    width: 300px;
    height: auto;
    border-radius: 10px;
    margin-right: 30px;
}

.function-text h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.function-text p {
    color: #666;
}

.download {
    padding: 50px;
    text-align: center;
}

.download h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.download p {
    margin-bottom: 30px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.download-btn {
    background-color: #3498db;
    color: white;
    padding: 15px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.download-btn:hover {
    background-color: #2980b9;
}

.other-downloads {
    list-style-type: none;
    padding: 0;
    margin-top: 30px;
}

.other-downloads li {
    margin-bottom: 10px;
}

.other-downloads li a {
    color: #3498db;
    text-decoration: none;
}

.other-downloads li a:hover {
    text-decoration: underline;
}

.contact {
    padding: 50px;
    text-align: center;
}

.contact h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.contact p {
    margin-bottom: 30px;
}

.contact-info {
    display: flex;
    justify-content: center;
    align-items: center;