/* 卓盛展示 · 简洁现代风 */
:root {
  --primary: #1a56db;
  --primary-dark: #163fa0;
  --dark: #111827;
  --gray: #6b7280;
  --light: #f8fafc;
  --border: #e5e7eb;
  --radius: 12px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: var(--dark); line-height: 1.7; background: #fff; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* 顶部导航 */
.nav { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav .logo { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.nav .logo span { color: var(--primary); }
.nav .menu { display: flex; gap: 32px; font-size: 15px; }
.nav .menu a { color: var(--gray); transition: color .2s; }
.nav .menu a:hover, .nav .menu a.active { color: var(--primary); }
.nav .cta { background: var(--primary); color: #fff; padding: 8px 20px; border-radius: 8px; font-size: 14px; }
.nav .cta:hover { background: var(--primary-dark); }
.nav .burger { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }

/* 首页 Hero - 图片轮播背景 */
.hero { position: relative; color: #fff; padding: 56px 0 48px; overflow: hidden; min-height: 420px; display: flex; align-items: center; }
.hero .slide { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0; transition: opacity 1.2s ease; z-index: 0; }
.hero .slide.active { opacity: 1; }
.hero .slide::after { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,42,.88) 0%, rgba(30,58,138,.72) 60%, rgba(26,86,219,.55) 100%); }
.hero .container { position: relative; z-index: 1; }
.hero h1 { font-size: 40px; line-height: 1.25; margin-bottom: 16px; font-weight: 700; text-shadow: 0 2px 12px rgba(0,0,0,.4); }
.hero p { font-size: 17px; color: rgba(255,255,255,.92); max-width: 640px; margin-bottom: 28px; text-shadow: 0 1px 8px rgba(0,0,0,.4); }
.hero .btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; font-size: 15px; font-weight: 600; }
.btn-primary { background: #fff; color: var(--primary-dark); }
.btn-outline { border: 1.5px solid rgba(255,255,255,.6); color: #fff; }
.btn-blue { background: var(--primary); color: #fff; }
.btn-blue:hover { background: var(--primary-dark); }
.hero .stats { display: flex; gap: 48px; margin-top: 56px; flex-wrap: wrap; }
.hero .stats .num { font-size: 30px; font-weight: 700; }
.hero .stats .lbl { font-size: 13px; color: rgba(255,255,255,.7); }

/* 区块 */
.section { padding: 72px 0; }
.section.alt { background: var(--light); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-head h2 { font-size: 30px; margin-bottom: 12px; }
.section-head p { color: var(--gray); font-size: 15px; }

/* 首页核心优势 */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; }
.feature .icon { font-size: 30px; margin-bottom: 14px; }
.feature h3 { font-size: 17px; margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--gray); }

/* 产品卡片网格 */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(17,24,39,.1); }
.card .thumb { aspect-ratio: 1/1; background: var(--light); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 18px 20px 22px; }
.card .body .tag { display: inline-block; font-size: 12px; color: var(--primary); background: #eff6ff; padding: 2px 10px; border-radius: 20px; margin-bottom: 8px; }
.card .body h3 { font-size: 16px; margin-bottom: 6px; }
.card .body p { font-size: 13px; color: var(--gray); margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .body .price { font-size: 14px; font-weight: 600; color: var(--primary); }

/* 分类筛选 */
.filter-bar { display: flex; gap: 12px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.filter-bar button { padding: 8px 22px; border-radius: 24px; border: 1px solid var(--border); background: #fff; cursor: pointer; font-size: 14px; color: var(--gray); transition: all .2s; }
.filter-bar button.active, .filter-bar button:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 产品详情 */
.detail { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; padding: 56px 0; }
.detail .gallery .main-img { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin-bottom: 12px; }
.detail .gallery .thumbs { display: flex; gap: 8px; }
.detail .gallery .thumbs img { width: 76px; height: 76px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); cursor: pointer; }
.detail .gallery .thumbs img.active { border-color: var(--primary); }
.detail .info h1 { font-size: 26px; margin-bottom: 8px; }
.detail .info .sub { color: var(--gray); margin-bottom: 20px; }
.detail .info .ref { font-size: 15px; color: var(--gray); margin-bottom: 20px; }
.detail .info .ref b { color: var(--primary); font-size: 18px; }
.detail .info .feat { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.detail .info .feat span { font-size: 13px; background: var(--light); border: 1px solid var(--border); padding: 5px 14px; border-radius: 20px; color: var(--dark); }
.detail .info .desc { color: var(--gray); font-size: 15px; margin-bottom: 28px; }
.detail .inquiry-box { background: var(--light); border-radius: var(--radius); padding: 24px; }
.detail .inquiry-box h4 { margin-bottom: 10px; }
.detail .inquiry-box p { font-size: 14px; color: var(--gray); margin-bottom: 14px; }

/* 关于页 */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-grid h2 { font-size: 28px; margin-bottom: 16px; }
.about-grid p { color: var(--gray); margin-bottom: 16px; font-size: 15px; }
.about-list { list-style: none; }
.about-list li { padding: 10px 0; border-bottom: 1px dashed var(--border); font-size: 15px; }
.about-list li b { color: var(--primary); }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info .item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.contact-info .item .ic { font-size: 22px; }
.contact-info .item h4 { font-size: 15px; margin-bottom: 4px; }
.contact-info .item p { color: var(--gray); font-size: 14px; }
.form-box { background: var(--light); border-radius: var(--radius); padding: 32px; }
.form-box label { display: block; font-size: 14px; margin-bottom: 6px; font-weight: 600; }
.form-box input, .form-box textarea, .form-box select { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; font-family: inherit; margin-bottom: 18px; background: #fff; }
.form-box textarea { min-height: 120px; resize: vertical; }
.form-box .btn { width: 100%; border: none; cursor: pointer; }

/* 页脚 */
.footer { background: #0f172a; color: rgba(255,255,255,.75); padding: 48px 0 32px; margin-top: 48px; }
.footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer h4 { color: #fff; margin-bottom: 14px; font-size: 15px; }
.footer p, .footer li { font-size: 14px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; }
.footer a:hover { color: #fff; }
.footer .copy { border-top: 1px solid rgba(255,255,255,.15); margin-top: 32px; padding-top: 20px; font-size: 13px; text-align: center; color: rgba(255,255,255,.5); }
.footer .copy a { display: inline-flex; align-items: center; gap: 4px; color: rgba(255,255,255,.5); text-decoration: none; font-size: 13px; }
.footer .copy a:hover { color: #fff; }
.footer .copy .icon { display: inline-block; width: 14px; height: 14px; background-size: contain; background-repeat: no-repeat; background-position: center; vertical-align: -2px; }
.footer .copy .icon-miit { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%2399a3b3' d='M8 0l6 2.5v4.2c0 3.8-2.5 6.8-6 8.3-3.5-1.5-6-4.5-6-8.3V2.5L8 0zm0 2.2L3.5 4v2.7c0 3 1.9 5.4 4.5 6.7 2.6-1.3 4.5-3.7 4.5-6.7V4L8 2.2zm-.9 3.6h1.8v1.2H7.8v.9h1.8v1.2H7.8v2.3H6.6V7.9H5.2V6.7h1.4v-.9h1.4V5.8h.5v-.9h.5v.9h.5v.9z'/%3E%3C/svg%3E"); }
.footer .copy .icon-gongan { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%2399a3b3' d='M8 1l6 2v4.5c0 3.5-2.3 6.3-6 7.5-3.7-1.2-6-4-6-7.5V3l6-2zm0 2.2L3.8 4.6v2.9c0 2.7 1.7 4.9 4.2 6 2.5-1.1 4.2-3.3 4.2-6V4.6L8 3.2zM7.2 5h1.6v1.4h.9V8h-.9v1.4H7.2V8h-.9V6.4h.9V5z'/%3E%3C/svg%3E"); }

/* 响应式 */
@media (max-width: 900px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .features { grid-template-columns: repeat(2, 1fr); }
  .detail, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer .cols { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .nav .menu { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px 24px; border-bottom: 1px solid var(--border); gap: 16px; }
  .nav .menu.open { display: flex; }
  .nav .burger { display: block; }
}
@media (max-width: 560px) {
  .product-grid { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
}