* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; color: #333; line-height: 1.6; }

.header { background: #1a1a2e; padding: 12px 0; position: sticky; top: 0; z-index: 100; }
.header .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; }
.logo a { color: #fff; font-size: 22px; font-weight: bold; text-decoration: none; }
.logo span { color: #009688; }
.nav { display: flex; list-style: none; gap: 8px; }
.nav a { color: #ccc; text-decoration: none; padding: 8px 16px; border-radius: 4px; transition: all .3s; }
.nav a:hover, .nav a.current { color: #fff; background: #009688; }

.banner { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%); color: #fff; padding: 100px 20px; text-align: center; }
.banner h1 { font-size: 42px; margin-bottom: 20px; }
.banner p { font-size: 16px; color: #aaa; max-width: 700px; margin: 0 auto 30px; }
.banner-btn { display: inline-block; color: #009688; font-size: 32px; animation: bounce 2s infinite; }
@keyframes bounce { 0%,100%{transform:translateY(0)} 50%{transform:translateY(10px)} }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.content_white { text-align: center; padding: 60px 20px 30px; }
.content_white h2 { font-size: 32px; color: #1a1a2e; margin-bottom: 10px; }
.content_white p { color: #666; }

.featured_content { padding: 30px 0 60px; background: #f8f9fa; }
.feature_grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; }
.feature_card { background: #fff; padding: 40px 30px; text-align: center; border-radius: 8px; box-shadow: 0 2px 15px rgba(0,0,0,.08); transition: transform .3s; }
.feature_card:hover { transform: translateY(-5px); }
.feature_card .icon { font-size: 48px; color: #009688; margin-bottom: 15px; }
.feature_card h3 { margin-bottom: 12px; color: #1a1a2e; }
.feature_card p { color: #666; font-size: 14px; margin-bottom: 20px; min-height: 80px; }
.feature_btn { display: inline-block; padding: 8px 24px; border: 2px solid #009688; color: #009688; text-decoration: none; border-radius: 4px; transition: all .3s; }
.feature_btn:hover { background: #009688; color: #fff; }

.testimonial { padding: 40px 0 60px; }
.test_grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(450px, 1fr)); gap: 30px; }
.test_box { display: flex; gap: 20px; background: #f8f9fa; padding: 20px; border-radius: 8px; }
.test_img { width: 120px; height: 80px; background: linear-gradient(135deg, #009688, #0f3460); border-radius: 6px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 24px; }
.test_desc h4 { margin-bottom: 8px; color: #1a1a2e; }
.test_desc p { font-size: 14px; color: #666; }

.footer { background: #1a1a2e; color: #999; }
.footer_midle { padding: 40px 0; }
.footer_bottom { background: #111; padding: 20px 0; text-align: center; font-size: 13px; }
.footer_bottom a { color: #009688; text-decoration: none; }

/* Product page */
.about { background: #f0f0f0; padding: 40px 0; text-align: center; }
.title-header { font-size: 28px; color: #1a1a2e; }
.panel { background: #fff; border: 1px solid #ddd; border-radius: 6px; margin-bottom: 20px; }
.panel-heading { padding: 12px 16px; background: #f5f5f5; border-bottom: 1px solid #ddd; font-weight: bold; }
.panel-body { padding: 16px; }
.table { width: 100%; border-collapse: collapse; }
.table td, .table th { border: 1px solid #ddd; padding: 8px 12px; }
.table tr:hover { background: #f9f9f9; }
.list-group { list-style: none; max-height: 240px; overflow: auto; }
.list-group-item { padding: 8px 16px; border-bottom: 1px solid #eee; cursor: pointer; }
.list-group-item:hover, .list-group-item.active { background: #009688; color: #fff; }
.list-group-item a { color: inherit; text-decoration: none; display: block; }
.row { display: flex; flex-wrap: wrap; gap: 20px; }
.col-md-9 { flex: 1; min-width: 300px; }
.col-md-3 { width: 280px; flex-shrink: 0; }
.accordion-title { padding: 10px 16px; background: #f5f5f5; cursor: pointer; border: 1px solid #ddd; margin-top: -1px; }
.accordion-title:hover { background: #e9e9e9; }
.accordion-body { display: none; }
.accordion-body.open { display: block; }
.text-info { color: #31708f; font-size: 13px; margin-top: 10px; }

/* Contact */
.contact-form { max-width: 600px; margin: 40px auto; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: bold; }
.form-control { width: 100%; padding: 10px 12px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }
.btn-primary { background: #009688; color: #fff; border: none; padding: 10px 30px; border-radius: 4px; cursor: pointer; font-size: 15px; }
.btn-primary:hover { background: #00796b; }

@media (max-width: 768px) {
  .banner h1 { font-size: 28px; }
  .test_grid { grid-template-columns: 1fr; }
  .col-md-3 { width: 100%; }
  .nav { display: none; }
}