* { box-sizing: border-box; }
body { margin: 0; color: #333; background: #f8f9fa; line-height: 1.7; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; }
a { color: #3498db; text-decoration: none; }
a:hover { color: #2980b9; }
.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
header { background: white; box-shadow: 0 2px 10px rgba(0, 0, 0, .08); }
.navbar { min-height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.logo { color: #2c3e50; font-size: 22px; font-weight: 700; white-space: nowrap; }
.logo i, .logo span { color: #3498db; }
.nav-links { display: flex; gap: 28px; flex-wrap: wrap; }
.nav-links a { color: #2c3e50; font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: #3498db; }
.breadcrumb { padding: 28px 0 18px; color: #777; font-size: 14px; }
.breadcrumb a { margin-right: 6px; }
.breadcrumb span { margin-left: 6px; }
.product-hero { padding: 42px; border-radius: 14px; color: white; display: flex; align-items: center; gap: 32px; }
.product-hero.zhicheng { background: linear-gradient(135deg, #667eea, #764ba2); }
.product-hero.jielong { background: linear-gradient(135deg, #f093fb, #f5576c); }
.product-hero.quyin { background: linear-gradient(135deg, #4facfe, #00b6d2); }
.product-icon { width: 92px; flex: 0 0 92px; text-align: center; font-size: 58px; }
h1 { margin: 0 0 10px; font-size: 32px; line-height: 1.3; }
.product-hero p { margin: 0; font-size: 16px; opacity: .96; }
.product-content { margin: 28px 0 60px; padding: 36px 42px; background: white; border-radius: 14px; box-shadow: 0 4px 20px rgba(0, 0, 0, .06); }
h2 { margin: 0 0 18px; color: #2c3e50; font-size: 23px; }
.features { margin: 0; padding-left: 22px; }
.features li { margin: 0 0 12px; color: #555; }
.features strong { color: #2c3e50; }
.use-product { margin-top: 34px; padding-top: 28px; border-top: 1px solid #e7ebef; text-align: center; }
.qr-code { width: 180px; height: 180px; margin: 0 auto; border: 2px dashed #ddd; border-radius: 10px; background: #f8f9fa; display: flex; align-items: center; justify-content: center; color: #ccc; font-size: 48px; }
.qr-code img { width: 100%; height: 100%; border-radius: 8px; object-fit: cover; }
.qr-label { margin: 10px 0 0; color: #777; font-size: 14px; }
.qr-note { margin: 8px 0 0; color: #999; font-size: 13px; }
footer { background: #2c3e50; color: #bdc3c7; padding: 28px 0; text-align: center; font-size: 13px; }
footer p { margin: 0; }
footer a { color: #bdc3c7; }
@media (max-width: 600px) {
    .navbar { padding: 14px 0; flex-direction: column; align-items: flex-start; gap: 8px; }
    .nav-links { gap: 18px; }
    .product-hero { padding: 28px 24px; display: block; }
    .product-icon { width: auto; text-align: left; font-size: 42px; margin-bottom: 10px; }
    h1 { font-size: 26px; }
    .product-content { padding: 28px 24px; }
}