* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Noto Sans SC', Arial, sans-serif; background-color: #f5f5f5; color: #333; line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.navbar { background-color: #343a40; padding: 15px 0; }
.navbar-brand { font-weight: 700; color: #fff; font-size: 1.5em; text-decoration: none; display: inline-block; }
.navbar-nav { display: flex; justify-content: flex-end; gap: 15px; }
.navbar-nav span { color: #fff; font-size: 1.1em; padding: 10px; }
.hero { background-color: #e9ecef; padding: 60px 0; text-align: center; }
.hero h1 { font-size: 2.5em; font-weight: 700; color: #333; margin-bottom: 15px; }
.hero p { font-size: 1.2em; color: #555; }
.section-title { text-align: center; margin: 40px 0 30px; font-size: 2em; font-weight: 700; color: #333; }
.about-section { background-color: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); margin-bottom: 20px; }
.about-section p { font-size: 1.1em; line-height: 1.8; color: #444; margin-bottom: 15px; }
.about-subnav { display: flex; justify-content: center; gap: 20px; margin-top: 20px; }
.about-subnav span { font-size: 1em; color: #007bff; }
.product-section { background-color: #f8f9fa; padding: 40px 0; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.product-card { background-color: #fff; border: 1px solid #ddd; padding: 20px; text-align: center; border-radius: 8px; min-height: 100px; display: flex; align-items: center; justify-content: center; }
.product-card h5 { font-size: 1em; color: #333; margin: 0; }
.news-section { padding: 40px 0; }
.news-item { background-color: #fff; padding: 20px; border-radius: 8px; margin-bottom: 15px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); display: flex; }
.news-date { font-weight: bold; color: #007bff; font-size: 1em; flex: 0 0 100px; }
.news-content h5 { font-size: 1.2em; color: #333; margin-bottom: 10px; }
.news-content p { font-size: 1em; color: #555; line-height: 1.6; }
footer { background-color: #fff; padding: 30px 0; text-align: center; border-top: 1px solid #eee; }
footer p { font-size: 0.9em; color: #555; margin: 5px 0; }
.hidden-xs { display: block; }
@media (max-width: 767px) {
    .navbar-nav { flex-direction: column; text-align: center; gap: 10px; }
    .hero h1 { font-size: 1.8em; }
    .hero p { font-size: 1em; }
    .product-grid { grid-template-columns: repeat(2, 1fr); gap: 15px; }
    .product-card { min-height: 80px; }
    .news-item { flex-direction: column; }
    .news-date { display: none; }
    .about-subnav { flex-direction: column; gap: 10px; }
    .hidden-xs { display: none; }
}