/* 深圳乐智源科技有限公司 - Apple 风格极简样式 */
:root {
  --blue: #0071e3;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --bg-gray: #f5f5f7;
  --border: #d2d2d7;
  --max-w: 1100px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "SF Pro SC", "SF Pro Display", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 导航 */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,.08);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 22px;
  height: 52px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; }
.nav-logo img { height: 34px; width: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}
.nav-links { display: flex; gap: 30px; list-style: none; }
.nav-links a { font-size: 13.5px; color: var(--text); opacity: .82; }
.nav-links a:hover, .nav-links a.active { opacity: 1; color: var(--blue); text-decoration: none; }

/* 首屏 */
.hero { position: relative; color: #fff; overflow: hidden; background: #090f1c; }
.hero img.bg { width: 100%; height: auto; display: block; }
.hero .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(rgba(9, 15, 28, .52), rgba(9, 15, 28, .62));
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 0 22px;
}
.hero h1 {
  font-size: 46px; font-weight: 700; color: #fff; letter-spacing: .03em;
  text-shadow: 0 2px 16px rgba(0,0,0,.45);
}
.hero p.en {
  font-size: 14px; color: rgba(255,255,255,.85); margin-top: 10px; letter-spacing: .05em;
  text-shadow: 0 1px 8px rgba(0,0,0,.4);
}
.hero p.sub {
  font-size: 20px; color: #fff; margin-top: 12px; font-weight: 400;
  text-shadow: 0 1px 10px rgba(0,0,0,.45);
}
.hero .cta-row { margin-top: 34px; display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.hero .btn-primary { background: linear-gradient(135deg, #16b3a6, #0d9488); }
.hero .btn-primary:hover { background: linear-gradient(135deg, #1cc2b4, #0fa396); }

.btn {
  display: inline-block; padding: 12px 30px; border-radius: 980px;
  font-size: 16px; transition: all .2s ease;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: #0077ed; color: #fff; text-decoration: none; }
.btn-ghost { border: 1px solid rgba(255,255,255,.8); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.15); color: #fff; text-decoration: none; }
.btn-blue-ghost { border: 1px solid var(--blue); color: var(--blue); }
.btn-blue-ghost:hover { background: rgba(0,113,227,.06); text-decoration: none; }

/* 通用区块 */
section { padding: 100px 0; }
.section-gray { background: var(--bg-gray); }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 22px; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 60px; }
.section-head h2 { font-size: 40px; font-weight: 700; letter-spacing: .01em; }
.section-head p { font-size: 18px; color: var(--text-secondary); margin-top: 12px; }
.eyebrow { color: var(--blue); font-size: 15px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; }

/* 产品卡片 */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  background: #fff; border-radius: 18px; overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
  display: flex; flex-direction: column; color: inherit;
}
.product-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0,0,0,.1); text-decoration: none; }
.product-card .thumb { aspect-ratio: 4/3; overflow: hidden; flex-shrink: 0; }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.product-card:hover .thumb img { transform: scale(1.04); }
.product-card .body {
  padding: 24px 26px 30px; flex: 1;
  display: flex; flex-direction: column; text-align: left;
}
.product-card h3 { font-size: 20px; font-weight: 600; }
.product-card p { font-size: 14px; color: var(--text-secondary); margin-top: 8px; }
.product-card .more { font-size: 14px; color: var(--blue); margin-top: auto; padding-top: 14px; display: inline-block; }

/* 优势 */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; text-align: center; }
.feature .icon { font-size: 40px; }
.feature h3 { font-size: 19px; font-weight: 600; margin-top: 14px; }
.feature p { font-size: 15px; color: var(--text-secondary); margin-top: 10px; }

/* 大图分段（产品页） */
.showcase { text-align: center; }
.showcase img { border-radius: 18px; margin: 0 auto; }
.showcase h2 { font-size: 36px; font-weight: 700; margin-top: 40px; }
.showcase p.lead { font-size: 19px; color: var(--text-secondary); max-width: 700px; margin: 16px auto 0; }
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 60px; }
.gallery img { border-radius: 18px; width: 100%; height: 100%; object-fit: cover; }
.gallery img.img-left { object-position: left center; }

/* 卖点列表 */
.points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 50px; align-items: stretch; }
.point { background: var(--bg-gray); border-radius: 18px; padding: 32px; }
.point h3 { font-size: 18px; font-weight: 600; }
.point p { font-size: 15px; color: var(--text-secondary); margin-top: 8px; }

/* 方案规格表 */
.spec-list { margin-top: 40px; border-top: 1px solid var(--border); }
.spec-list li {
  list-style: none; padding: 18px 4px; border-bottom: 1px solid var(--border);
  display: flex; gap: 20px; font-size: 16px;
}
.spec-list .k { min-width: 130px; font-weight: 600; }
.spec-list .v { color: var(--text-secondary); }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--border); padding: 28px 4px; }
.faq-item h3 { font-size: 19px; font-weight: 600; cursor: pointer; position: relative; padding-right: 30px; }
.faq-item h3::after {
  content: "+"; position: absolute; right: 4px; top: -2px;
  font-size: 24px; color: var(--text-secondary); font-weight: 400;
}
.faq-item.open h3::after { content: "–"; }
.faq-item .answer { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.open .answer { max-height: 600px; }
.faq-item .answer p { padding-top: 14px; font-size: 16px; color: var(--text-secondary); }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info h2 { font-size: 32px; font-weight: 700; }
.contact-info dl { margin-top: 30px; }
.contact-info dt { font-size: 13px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: .05em; }
.contact-info dd { font-size: 18px; margin: 6px 0 22px; }
.contact-form .field { margin-bottom: 20px; }
.contact-form label { font-size: 14px; font-weight: 600; display: block; margin-bottom: 8px; }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 12px;
  font-size: 16px; font-family: inherit; outline: none; background: #fff;
}
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(0,113,227,.15); }

/* 页脚 */
footer { background: var(--bg-gray); padding: 50px 0 40px; font-size: 13px; color: var(--text-secondary); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-grid h4 { font-size: 14px; color: var(--text); font-weight: 600; margin-bottom: 12px; }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a { color: var(--text-secondary); }
.footer-grid a:hover { color: var(--text); }
.footer-bottom {
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.footer-bottom a { color: var(--text-secondary); }

/* 面包屑 */
.breadcrumb { font-size: 13px; color: var(--text-secondary); padding: 18px 0 0; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--blue); }

/* 页头横幅（子页面） */
.page-hero { background: var(--bg-gray); text-align: center; padding: 80px 22px 70px; }
.page-hero h1 { font-size: 44px; font-weight: 700; }
.page-hero p { font-size: 19px; color: var(--text-secondary); margin-top: 12px; }

/* 响应式 */
@media (max-width: 860px) {
  .product-grid, .feature-grid, .contact-grid { grid-template-columns: 1fr; }
  .points, .gallery { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .hero img.bg { height: 480px; object-fit: cover; object-position: center top; }
  .section-head h2 { font-size: 30px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 12.5px; }
}