/* ============================================================
   香港量子科技有限公司 · 官网样式
   HONG KONG QUANTUM TECH LIMITED
   ============================================================ */
:root {
  --blue: #0A4C8C;
  --blue-dark: #083A6B;
  --blue-mid: #1466A8;
  --blue-light: #EAF2FA;
  --red: #C8102E;
  --red-dark: #A30D25;
  --text: #2B2F36;
  --text-light: #5F6B7A;
  --bg: #FFFFFF;
  --bg-gray: #F4F6F9;
  --border: #E3E8F0;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(10, 76, 140, 0.08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
}
a { color: var(--blue-mid); text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

/* ---------- 双语切换 ---------- */
.lang-en .zh { display: none !important; }
.lang-zh .en { display: none !important; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: #fff; border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 6px rgba(10, 76, 140, 0.05);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 42px; width: auto; }
.brand-name { line-height: 1.25; }
.brand-name .cn { font-size: 19px; font-weight: 700; color: var(--blue-dark); letter-spacing: 1px; }
.brand-name .en { font-size: 11px; color: var(--text-light); letter-spacing: 0.6px; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 8px 15px; font-size: 15px; color: var(--text);
  border-radius: 6px; transition: all 0.2s; font-weight: 500;
}
.nav a:hover { color: var(--blue); background: var(--blue-light); }
.nav a.active { color: var(--blue); font-weight: 600; }
.nav .lang-btn {
  margin-left: 10px; padding: 7px 14px; border: 1px solid var(--blue);
  color: var(--blue); border-radius: 6px; background: #fff;
  cursor: pointer; font-size: 14px; font-weight: 600; transition: all 0.2s;
}
.nav .lang-btn:hover { background: var(--blue); color: #fff; }
.menu-toggle { display: none; background: none; border: none; font-size: 26px; color: var(--blue-dark); cursor: pointer; }

/* ---------- 首页 Banner ---------- */
.hero {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue) 55%, #1B6CA8 100%);
  color: #fff; position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; right: -120px; top: -120px;
  width: 420px; height: 420px; border-radius: 50%;
  background: rgba(255,255,255,0.06);
}
.hero::before {
  content: ""; position: absolute; left: -80px; bottom: -140px;
  width: 380px; height: 380px; border-radius: 50%;
  background: rgba(200,16,46,0.18);
}
.hero-inner { padding: 92px 20px 84px; text-align: center; position: relative; z-index: 2; }
/* —— hero 产品图动态轮换 —— */
.hero-slides { position: absolute; inset: 0; z-index: 0; }
.hero-slide {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0; transition: opacity 1.4s ease;
}
.hero-slide.active { opacity: 1; }
.hero-overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg, rgba(5,28,56,0.62) 0%, rgba(8,58,107,0.58) 100%);
}
.hero-dots {
  position: absolute; bottom: 16px; left: 0; right: 0; z-index: 3;
  display: flex; justify-content: center; gap: 9px;
}
.hero-dots .dot {
  width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.45);
  border: none; cursor: pointer; padding: 0; transition: all 0.25s;
}
.hero-dots .dot.active { background: var(--red); width: 26px; border-radius: 6px; }
.hero-qt { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.hero-qt a {
  color: #fff; border: 1px solid rgba(255,255,255,0.5); border-radius: 20px;
  padding: 6px 16px; font-size: 13px; background: rgba(255,255,255,0.10);
  transition: all 0.2s;
}
.hero-qt a:hover { background: var(--red); border-color: var(--red); }
.hero .slogan-cn { font-size: 34px; font-weight: 700; letter-spacing: 3px; margin-bottom: 12px; }
.hero .slogan-en { font-size: 15px; letter-spacing: 1.2px; opacity: 0.92; margin-bottom: 22px; }
.hero .sub { font-size: 16px; opacity: 0.9; margin-bottom: 34px; }
.hero .hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero .btn {
  padding: 12px 30px; border-radius: 8px; font-size: 15px; font-weight: 600;
  transition: all 0.2s;
}
.hero .btn-primary { background: var(--red); color: #fff; }
.hero .btn-primary:hover { background: var(--red-dark); }
.hero .btn-ghost { border: 1.5px solid #fff; color: #fff; }
.hero .btn-ghost:hover { background: rgba(255,255,255,0.12); }

/* ---------- 板块标题 ---------- */
.section { padding: 64px 0; }
.section.gray { background: var(--bg-gray); }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 28px; color: var(--blue-dark); margin-bottom: 8px; letter-spacing: 1px; }
.section-title .bar { width: 52px; height: 4px; background: var(--red); margin: 0 auto 12px; border-radius: 2px; }
.section-title p { color: var(--text-light); font-size: 15px; }

/* ---------- 核心产品卡片 ---------- */
.prod-grid { display: flex; flex-wrap: wrap; gap: 22px; justify-content: center; }
.prod-card {
  flex: 1 1 300px; max-width: 360px; min-width: 260px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; transition: all 0.25s;
}
.prod-card:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(10,76,140,0.12); }
.prod-card .thumb { height: 210px; background: #fff; display: flex; align-items: center; justify-content: center; padding: 14px; }
.prod-card .thumb img { max-height: 100%; object-fit: contain; }
.prod-card .body { padding: 16px 18px 20px; border-top: 1px solid var(--border); }
.prod-card .name-cn { font-size: 17px; font-weight: 700; color: var(--blue-dark); margin-bottom: 4px; }
.prod-card .name-en { font-size: 12px; color: var(--text-light); margin-bottom: 8px; }
.prod-card .desc { font-size: 13.5px; color: var(--text-light); line-height: 1.6; }

/* ---------- 产品大卡片（产品中心） ---------- */
.prod-block { display: flex; flex-wrap: wrap; gap: 26px; align-items: flex-start; margin-bottom: 34px; }
.prod-block .img-side { flex: 1 1 300px; max-width: 380px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.prod-block .img-side img { width: 100%; max-height: 280px; object-fit: contain; }
.prod-block .txt-side { flex: 1 1 520px; min-width: 0; }
.prod-block .tag { display: inline-block; background: var(--red); color: #fff; font-size: 12px; padding: 3px 10px; border-radius: 4px; margin-bottom: 8px; }
.prod-block h3 { font-size: 22px; color: var(--blue-dark); margin-bottom: 4px; }
.prod-block .model { font-size: 13px; color: var(--text-light); margin-bottom: 10px; }
.prod-block p { font-size: 14.5px; color: var(--text); margin-bottom: 10px; }
.prod-block .features { background: var(--blue-light); border-radius: 8px; padding: 12px 16px; }
.prod-block .features b { color: var(--blue-dark); }
.prod-block .features ul { margin: 6px 0 0 18px; }
.prod-block .features li { font-size: 13.5px; margin: 3px 0; }
.prod-block .apps { margin-top: 10px; font-size: 13.5px; color: var(--text-light); }

/* ---------- 品牌墙 ---------- */
.brand-wall { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.brand-chip {
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 22px; min-width: 160px; text-align: center; transition: all 0.2s;
}
.brand-chip:hover { border-color: var(--blue-mid); box-shadow: var(--shadow); }
.brand-chip .b-cn { font-size: 16px; font-weight: 700; color: var(--blue-dark); }
.brand-chip .b-en { font-size: 11px; color: var(--text-light); letter-spacing: 0.5px; }
.brand-chip .b-src { font-size: 11px; color: var(--red); }

/* ---------- 应用领域 ---------- */
.app-grid { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.app-chip {
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 18px; font-size: 14px; color: var(--text); transition: all 0.2s;
}
.app-chip:hover { border-color: var(--blue-mid); color: var(--blue); background: var(--blue-light); }

/* ---------- 双栏特性 ---------- */
.two-col { display: flex; flex-wrap: wrap; gap: 30px; align-items: center; }
.two-col .col { flex: 1 1 380px; min-width: 0; }
.two-col h3 { font-size: 22px; color: var(--blue-dark); margin-bottom: 12px; }
.two-col p { color: var(--text-light); font-size: 14.5px; margin-bottom: 10px; }
.two-col .img-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.two-col .img-box img { width: 100%; max-height: 320px; object-fit: contain; }

/* ---------- 联系 CTA ---------- */
.cta-band { background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%); color: #fff; text-align: center; padding: 56px 20px; }
.cta-band h3 { font-size: 26px; margin-bottom: 10px; letter-spacing: 1px; }
.cta-band p { opacity: 0.92; margin-bottom: 22px; }
.cta-band .btn { background: var(--red); color: #fff; padding: 12px 34px; border-radius: 8px; font-weight: 600; }
.cta-band .btn:hover { background: var(--red-dark); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--blue-dark); color: rgba(255,255,255,0.88); padding: 44px 0 24px; font-size: 13.5px; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 30px; margin-bottom: 28px; }
.footer-col { flex: 1 1 220px; min-width: 0; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 12px; border-left: 3px solid var(--red); padding-left: 10px; }
.footer-col p { margin: 4px 0; line-height: 1.8; }
.footer-col a { color: rgba(255,255,255,0.85); }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.15); padding-top: 18px; text-align: center; color: rgba(255,255,255,0.6); font-size: 12.5px; }

/* ---------- 内页横幅 ---------- */
.page-banner { background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue) 70%); color: #fff; padding: 54px 20px; text-align: center; }
.page-banner h1 { font-size: 30px; letter-spacing: 2px; margin-bottom: 6px; }
.page-banner p { opacity: 0.92; font-size: 15px; }
.breadcrumb { margin-top: 10px; font-size: 13px; color: rgba(255,255,255,0.8); }
.breadcrumb a { color: #fff; }

/* ---------- 关于我们 ---------- */
.about-intro p { font-size: 15px; color: var(--text); margin-bottom: 14px; }
.value-grid { display: flex; flex-wrap: wrap; gap: 20px; }
.value-card { flex: 1 1 250px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; text-align: center; }
.value-card .num { font-size: 30px; font-weight: 800; color: var(--red); }
.value-card .t { font-weight: 600; color: var(--blue-dark); margin: 6px 0 4px; }
.value-card .d { font-size: 13px; color: var(--text-light); }

/* ---------- 资料下载 ---------- */
.dl-item {
  display: flex; flex-wrap: wrap; align-items: center; gap: 16px;
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  padding: 14px 18px; margin-bottom: 12px; transition: all 0.2s;
}
.dl-item:hover { border-color: var(--blue-mid); box-shadow: var(--shadow); }
.dl-item .dl-name { flex: 1 1 300px; }
.dl-item .dl-name b { color: var(--text); }
.dl-item .dl-name span { display: block; font-size: 12.5px; color: var(--text-light); }
.dl-item .dl-btn { background: var(--blue); color: #fff; padding: 8px 18px; border-radius: 6px; font-size: 14px; font-weight: 600; }
.dl-item .dl-btn:hover { background: var(--blue-dark); }
.dl-cat { font-size: 18px; font-weight: 700; color: var(--blue-dark); margin: 26px 0 14px; border-left: 4px solid var(--red); padding-left: 12px; }
.dl-major {
  display: inline-block; font-size: 22px; font-weight: 800; letter-spacing: 2px;
  color: #fff; background: linear-gradient(90deg, var(--red), var(--blue));
  padding: 9px 26px; border-radius: 6px; margin: 30px 0 4px;
}

/* ---------- 联系页 ---------- */
.contact-grid { display: flex; flex-wrap: wrap; gap: 26px; }
.contact-card { flex: 1 1 340px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.contact-card h3 { color: var(--blue-dark); font-size: 18px; margin-bottom: 12px; border-left: 3px solid var(--red); padding-left: 10px; }
.contact-card .row { margin: 8px 0; }
.contact-card .lbl { font-size: 12.5px; color: var(--text-light); }
.contact-card .val { font-weight: 600; }
.contact-card .val a { color: var(--blue-mid); }

/* ---------- 产品详情页 ---------- */
.pp-banner { background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue) 70%); color: #fff; padding: 46px 20px 40px; }
.pp-banner .row { display: flex; flex-wrap: wrap; gap: 30px; align-items: center; max-width: 1180px; margin: 0 auto; }
.pp-banner .thumb { flex: 1 1 260px; max-width: 360px; background: #fff; border-radius: 10px; padding: 12px; }
.pp-banner .thumb img { width: 100%; max-height: 220px; object-fit: contain; }
.pp-banner .txt { flex: 1 1 520px; min-width: 0; }
.pp-banner .tag { display: inline-block; background: var(--red); color: #fff; font-size: 12px; padding: 3px 10px; border-radius: 4px; margin-bottom: 10px; }
.pp-banner h1 { font-size: 28px; letter-spacing: 1px; margin-bottom: 8px; }
.pp-banner .model { font-size: 14px; opacity: 0.94; margin-bottom: 10px; }
.pp-banner .lead { font-size: 14.5px; opacity: 0.92; }
.pp-banner .breadcrumb { margin-top: 12px; font-size: 13px; color: rgba(255,255,255,0.85); }
.pp-banner .breadcrumb a { color: #fff; }
.pp-subnav {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  background: var(--bg-gray); border-bottom: 1px solid var(--border); padding: 12px 16px;
}
.pp-subnav a { font-size: 13.5px; color: var(--text); border: 1px solid var(--border); background: #fff; padding: 6px 14px; border-radius: 20px; transition: all 0.2s; }
.pp-subnav a:hover { color: #fff; background: var(--blue); border-color: var(--blue); }
.pp-intro h3, .pp-sec h3 { font-size: 22px; color: var(--blue-dark); margin-bottom: 8px; }
.pp-intro .lead { font-size: 15px; color: var(--text-light); margin-bottom: 14px; }
.pp-intro p { font-size: 14.5px; color: var(--text); margin-bottom: 10px; }
.pp-sec { padding: 56px 0; }
.pp-sec.alt { background: var(--bg-gray); }
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.spec-table th, .spec-table td { border: 1px solid var(--border); padding: 10px 14px; font-size: 14px; text-align: left; }
.spec-table th { background: var(--blue-light); color: var(--blue-dark); font-weight: 600; width: 34%; }
.spec-table td { color: var(--text); }
.rel-grid { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; }
.rel-card { flex: 1 1 220px; max-width: 260px; background: #fff; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; transition: all 0.25s; }
.rel-card:hover { transform: translateY(-4px); box-shadow: 0 10px 26px rgba(10,76,140,0.12); }
.rel-card .thumb { height: 130px; background: #fff; display: flex; align-items: center; justify-content: center; padding: 10px; }
.rel-card .thumb img { max-height: 100%; object-fit: contain; }
.rel-card .name { padding: 10px 14px; font-size: 14px; font-weight: 600; color: var(--blue-dark); text-align: center; }
.pp-dl-note { margin-top: 26px; background: var(--blue-light); border-radius: 8px; padding: 14px 18px; font-size: 13.5px; color: var(--blue-dark); }
.pp-sec .dl-cat { margin-top: 6px; }
.pp-link { display: inline-block; margin-top: 12px; background: var(--blue); color: #fff; padding: 8px 18px; border-radius: 6px; font-size: 13.5px; font-weight: 600; transition: all 0.2s; }
.pp-link:hover { background: var(--red); }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .nav {
    position: absolute; top: 68px; left: 0; right: 0; background: #fff;
    flex-direction: column; align-items: stretch; padding: 10px 20px 16px;
    border-bottom: 1px solid var(--border); display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 8px; border-bottom: 1px solid var(--bg-gray); }
  .nav .lang-btn { margin: 10px 0 0; width: 100%; text-align: center; }
  .hero-inner { padding: 60px 16px 56px; }
  .hero .slogan-cn { font-size: 26px; }
  .section { padding: 44px 0; }
  .prod-block .img-side { max-width: 100%; }
}