:root {
    --primary-color: #0078d7;
    --secondary-color: #50b6ff;
    --text-color: #333;
    --light-bg: #f5f5f5;
    --white: #ffffff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: var(--light-bg);
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
}

.logo {
    height: 80px;
    width: auto;
}

h1 {
    color: var(--primary-color);
    margin: 0;
    font-size: 2.5rem;
}

.tagline {
    font-size: 1.2rem;
    color: #666;
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.features {
    background: var(--white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.features h2 {
    color: var(--primary-color);
    margin-top: 0;
}

.features ul {
    padding-left: 20px;
}

.features li {
    margin-bottom: 10px;
}

.download {
    background: var(--white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
}

.download-box {
    margin: 20px 0;
}

.download-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: var(--secondary-color);
}

.file-info {
    color: #666;
    font-size: 0.9rem;
    margin-top: 10px;
}

.requirements {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

footer {
    text-align: center;
    margin-top: 50px;
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    .logo-container {
        flex-direction: column;
        gap: 10px;
    }
}