/* 静态页面样式 - SEO优化版（无动画） */
* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "微软雅黑", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 3px solid #667eea;
    position: relative;
}

.header::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 3px;
}

.header h1 {
    font-size: 2.2em;
    color: #2c3e50;
    margin-bottom: 0;
    font-weight: 700;
    line-height: 1.3;
}

.description {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 20px 25px;
    border-radius: 12px;
    margin-bottom: 35px;
    color: #555;
    border-left: 4px solid #667eea;
    font-size: 1.05em;
    line-height: 1.8;
}

.download-section {
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.4em;
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #e9ecef;
    font-weight: 600;
}

.download-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.download-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    font-size: 1em;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    word-break: break-word;
    min-width: 200px;
    flex: 0 0 auto;
}

.download-link:hover {
    opacity: 0.9;
}

.qrcode-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.qrcode-item {
    text-align: center;
    padding: 25px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    border: 2px solid #e9ecef;
}

.qrcode-item img {
    max-width: 220px;
    width: 100%;
    height: auto;
    border-radius: 12px;
    margin-bottom: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.qrcode-item p {
    color: #555;
    font-size: 1em;
    font-weight: 500;
}

.back-link {
    text-align: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #e9ecef;
}

.back-link a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05em;
    padding: 12px 24px;
    border-radius: 8px;
}

.back-link a:hover {
    background: #f8f9fa;
}

.footer {
    text-align: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #e9ecef;
    color: #999;
    font-size: 0.95em;
}

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

.footer-links {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    font-size: 0.9em;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* 移动端优化 */
@media (max-width: 768px) {
    body { padding: 15px; }
    .container { padding: 25px 20px; border-radius: 12px; }
    .header h1 { font-size: 1.6em; }
    .section-title { font-size: 1.2em; }
    .download-links { grid-template-columns: 1fr; }
    .download-link { padding: 15px 20px; font-size: 1em; }
    .qrcode-section { grid-template-columns: 1fr; gap: 20px; }
    .qrcode-item { padding: 20px; }
}

@media (max-width: 480px) {
    .header h1 { font-size: 1.4em; }
    .download-links { grid-template-columns: 1fr; }
}

/* 打印样式 */
@media print {
    body { background: white; padding: 0; }
    .container { box-shadow: none; padding: 20px; }
    .back-link, .footer-links { display: none; }
}