* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

header {
    height: 80px;
    display: flex;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(0,0,0,0.5);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo img {
    height: 40px;
}

nav a {
    margin-left: 25px;
    text-decoration: none;
    color: #fff;
    font-size: 16px;
    font-weight: 500;
}

.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    color: #fff;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content h1 {
    font-size: 60px;
    margin-bottom: 20px;
    font-weight: 400;
}

.hero-content .desc {
    font-size: 24px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.btn-download {
    background-color: #2196f3;
    color: #fff;
    padding: 15px 50px;
    border-radius: 4px;
    text-decoration: none;
    font-size: 20px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: background 0.3s;
}

.btn-download:hover {
    background-color: #1976d2;
}

.sub-links {
    margin-top: 20px;
    font-size: 14px;
}

.sub-links a {
    color: #fff;
    text-decoration: none;
    margin-right: 15px;
}

.divider {
    margin-right: 15px;
    opacity: 0.5;
}

.version {
    margin-top: 10px;
    font-size: 12px;
    opacity: 0.7;
}

.features {
    padding: 80px 0;
    background: #f5f5f5;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    background: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    text-align: center;
}

.feature-item h3 {
    margin-bottom: 15px;
    color: #2196f3;
    font-size: 20px;
}

.feature-item p {
    font-size: 14px;
    color: #666;
}

footer {
    padding: 40px 0;
    background: #333;
    color: #999;
    text-align: center;
    font-size: 14px;
}

.footer-links {
    margin-top: 10px;
}

.footer-links a {
    color: #999;
    text-decoration: none;
    margin: 0 10px;
}