/* Reset & Basic Styles */
:root {
    --primary-color: #0066cc; /* 科技蓝，信任感强 */
    --secondary-color: #004c99;
    --text-color: #333;
    --bg-color: #f9f9f9;
    --white: #ffffff;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

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

/* Header */
.site-header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.logo span {
    color: #333;
    font-size: 18px;
    margin-left: 5px;
}

.main-nav ul {
    display: flex;
    gap: 30px;
}

.main-nav a {
    font-weight: 500;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary-color);
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #0066cc 0%, #004c99 100%);
    color: var(--white);
    padding: 100px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-group .btn {
    display: inline-block;
    padding: 15px 40px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: bold;
    margin: 0 10px;
}

.btn-primary {
    background: var(--white);
    color: var(--primary-color);
}

.btn-primary:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
}

.version-info {
    margin-top: 20px;
    font-size: 14px;
    opacity: 0.8;
}

/* Section Common */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 15px auto 0;
}

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

.feature-item {
    text-align: center;
    padding: 30px;
    background: var(--bg-color);
    border-radius: 10px;
    transition: 0.3s;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

.feature-item .icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.feature-item h3 {
    margin-bottom: 15px;
}

/* Download */
.download-section {
    background: #f0f4f8;
}

.download-tabs {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.download-card {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    width: 260px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    border-top: 4px solid var(--primary-color);
}

.download-card:hover {
    transform: translateY(-5px);
}

.os-icon {
    font-size: 24px;
    font-weight: bold;
    color: #ccc;
    margin-bottom: 20px;
}

.btn-download {
    display: block;
    background: var(--primary-color);
    color: var(--white);
    padding: 10px;
    border-radius: 5px;
    margin-top: 20px;
}

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

/* News */
.news-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.news-item {
    background: var(--white);
    border: 1px solid #eee;
    padding: 20px;
    border-radius: 8px;
}

.news-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.news-item h3 a:hover {
    color: var(--primary-color);
}

.news-meta {
    font-size: 12px;
    color: #999;
    margin-bottom: 10px;
}

.news-excerpt {
    font-size: 14px;
    color: #666;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

/* Links Section */
.links-section {
    background: #333;
    color: #888;
    padding: 40px 0;
}

.links-section h4 {
    color: #fff;
    margin-bottom: 20px;
}

.links-box a {
    color: #888;
    margin-right: 15px;
    font-size: 14px;
}

.links-box a:hover {
    color: #fff;
}

/* Footer */
.site-footer {
    background: #222;
    color: #666;
    padding: 40px 0;
    text-align: center;
    font-size: 14px;
}

.site-footer p {
    margin-bottom: 10px;
}

.site-footer a:hover {
    color: var(--white);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 32px;
    }
    
    .main-nav {
        display: none; /* Mobile menu can be added if needed */
    }
}