* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif; line-height: 1.6; color: #333; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); min-height: 100vh; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
header { background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); box-shadow: 0 2px 20px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
nav { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; }
.logo { font-size: 28px; font-weight: bold; color: #667eea; text-decoration: none; }
.nav-links { display: flex; list-style: none; gap: 30px; }
.nav-links a { text-decoration: none; color: #333; font-weight: 500; transition: color 0.3s; }
.nav-links a:hover { color: #667eea; }
.hero { text-align: center; padding: 100px 20px; color: white; }
.hero h1 { font-size: 48px; margin-bottom: 20px; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
.hero p { font-size: 18px; margin-bottom: 40px; max-width: 800px; margin-left: auto; margin-right: auto; }
.download-btn { display: inline-block; padding: 15px 40px; background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); color: white; text-decoration: none; border-radius: 50px; font-weight: bold; font-size: 18px; transition: transform 0.3s, box-shadow 0.3s; }
.download-btn:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(245,87,108,0.4); }
.section { padding: 80px 20px; background: white; margin-bottom: 30px; border-radius: 20px; box-shadow: 0 10px 40px rgba(0,0,0,0.05); }
.section-title { text-align: center; font-size: 36px; color: #333; margin-bottom: 50px; position: relative; }
.section-title::after { content: ''; position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%); width: 80px; height: 4px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border-radius: 2px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-card { background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%); padding: 40px; border-radius: 15px; text-align: center; transition: transform 0.3s; }
.feature-card:hover { transform: translateY(-10px); }
.feature-card .icon { font-size: 48px; margin-bottom: 20px; }
.feature-card h3 { font-size: 24px; margin-bottom: 15px; color: #333; }
.feature-card p { color: #666; }
.products { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
.product-card { background: #fff; border: 1px solid #e0e0e0; border-radius: 15px; overflow: hidden; transition: box-shadow 0.3s; }
.product-card:hover { box-shadow: 0 15px 40px rgba(0,0,0,0.15); }
.product-card img { width: 100%; height: 200px; object-fit: cover; }
.product-card .product-info { padding: 25px; }
.product-card h3 { font-size: 20px; margin-bottom: 10px; color: #333; }
.product-card p { color: #666; margin-bottom: 15px; }
.product-card .price { font-size: 24px; font-weight: bold; color: #667eea; }
.news-section { padding: 80px 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.news-section .section-title { color: white; }
.news-section .section-title::after { background: white; }
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px; }
.news-card { background: white; padding: 30px; border-radius: 15px; transition: transform 0.3s; }
.news-card:hover { transform: translateY(-5px); }
.news-card .news-date { color: #999; font-size: 14px; margin-bottom: 15px; }
.news-card h3 { font-size: 20px; margin-bottom: 15px; color: #333; }
.news-card p { color: #666; line-height: 1.8; }
.about-section { padding: 80px 20px; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-text h3 { font-size: 28px; margin-bottom: 20px; color: #333; }
.about-text p { color: #666; margin-bottom: 15px; }
.about-image img { width: 100%; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
.contact-section { padding: 80px 20px; background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.contact-section .section-title { color: white; }
.contact-section .section-title::after { background: white; }
.contact-form { max-width: 600px; margin: 0 auto; background: white; padding: 40px; border-radius: 15px; }
.contact-form input, .contact-form textarea { width: 100%; padding: 15px; margin-bottom: 20px; border: 1px solid #ddd; border-radius: 10px; font-size: 16px; }
.contact-form textarea { resize: vertical; min-height: 150px; }
.contact-form button { width: 100%; padding: 15px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border: none; border-radius: 10px; font-size: 18px; font-weight: bold; cursor: pointer; transition: opacity 0.3s; }
.contact-form button:hover { opacity: 0.9; }
.contact-info { text-align: center; color: white; margin-top: 40px; }
.contact-info p { margin-bottom: 10px; }
footer { background: #333; color: white; padding: 40px 20px; text-align: center; }
footer p { margin-bottom: 10px; }
footer a { color: #667eea; text-decoration: none; }
footer a:hover { text-decoration: underline; }
@media (max-width: 768px) { .hero h1 { font-size: 32px; } .nav-links { gap: 15px; } .nav-links a { font-size: 14px; } .about-content { grid-template-columns: 1fr; } .news-grid { grid-template-columns: 1fr; } }
.back-to-top { position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; cursor: pointer; opacity: 0; visibility: hidden; transition: all 0.3s; z-index: 100; }
.back-to-top.show { opacity: 1; visibility: visible; }