:root {
  --bg: #ffffff;
  --surface: #f6f8fb;
  --surface-blue: #eef5ff;
  --ink: #111827;
  --muted: #5f6b7c;
  --line: #dfe5ec;
  --blue: #1769e8;
  --blue-dark: #0f53bb;
  --cyan: #00bcd4;
  --green: #079b5b;
  --charcoal: #171a20;
  --radius: 6px;
  --shadow: 0 16px 42px rgba(17, 24, 39, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
}
body.modal-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; letter-spacing: 0; }
button { cursor: pointer; }
img, video { display: block; max-width: 100%; }
.wrap { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 1000; background: var(--ink); color: #fff; padding: 10px 14px; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 24px; font-weight: 800; white-space: nowrap; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: var(--blue); border-radius: 6px; font-size: 18px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { color: #303a49; font-size: 15px; font-weight: 650; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--blue); }
.nav-links .nav-action {
  appearance: none;
  padding: 9px 15px;
  border: 1px solid var(--blue);
  border-radius: 4px;
  background: #fff;
  color: var(--blue);
  font-size: 15px;
  font-weight: 650;
  line-height: 1.5;
}
.nav-links .nav-action:hover, .nav-links .nav-action:focus-visible { background: var(--surface-blue); }
.menu-button { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; border-radius: 4px; align-items: center; justify-content: center; }
.menu-button svg { width: 22px; height: 22px; }

.hero { padding: 76px 0 54px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: 68px; align-items: center; }
.hero h1 { margin: 0; max-width: 620px; font-size: 62px; line-height: 1.14; font-weight: 850; }
.hero-copy { margin: 26px 0 0; max-width: 590px; color: var(--muted); font-size: 20px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 20px; border: 1px solid #bfc9d7; border-radius: 4px; background: #fff; color: var(--ink); font-weight: 750; }
.btn:hover, .btn:focus-visible { border-color: var(--blue); color: var(--blue); }
.btn.primary { border-color: var(--blue); background: var(--blue); color: #fff; }
.btn.primary:hover, .btn.primary:focus-visible { background: var(--blue-dark); color: #fff; }
.btn.dark { border-color: #fff; background: #fff; color: var(--charcoal); }
.btn svg { width: 18px; height: 18px; flex: 0 0 auto; }
.hero-media { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hero-shot { margin: 0; height: 185px; overflow: hidden; border: 1px solid var(--line); background: var(--surface); border-radius: var(--radius); box-shadow: 0 8px 24px rgba(17,24,39,.08); }
.hero-shot:nth-child(2), .hero-shot:nth-child(3) { transform: translateY(24px); }
.hero-shot img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }

.section { padding: 92px 0; }
.section.alt { background: var(--surface); }
.section-title { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 54px; }
.section-title h2 { margin: 0; font-size: 42px; line-height: 1.2; }
.section-title p { margin: 0; max-width: 550px; color: var(--muted); font-size: 17px; }

.product-list { border-top: 1px solid var(--line); }
.product-row { --accent: var(--blue); display: grid; grid-template-columns: .88fr 1.12fr; gap: 68px; align-items: center; padding: 66px 0; border-bottom: 1px solid var(--line); }
.product-row.reverse { grid-template-columns: 1.12fr .88fr; }
.product-row.reverse .product-copy { order: 2; }
.product-row.reverse .product-media { order: 1; }
.product-index { color: var(--accent); font-weight: 800; font-size: 14px; }
.product-copy h3 { margin: 10px 0 14px; font-size: 36px; line-height: 1.25; }
.product-copy > p { margin: 0; color: var(--muted); font-size: 17px; }
.product-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 22px 0 0; padding: 0; list-style: none; color: #394455; font-size: 14px; }
.product-meta li { padding-left: 13px; position: relative; }
.product-meta li::before { content: ""; position: absolute; left: 0; top: .78em; width: 5px; height: 5px; background: var(--accent); }
.product-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-weight: 800; min-height: 44px; padding: 0 4px; }
.text-link svg { width: 18px; height: 18px; }
.product-media { min-width: 0; }
.product-media img { width: 100%; max-height: 420px; object-fit: contain; object-position: center; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }

.proof-head { max-width: 760px; }
.proof-head h2 { margin: 0; font-size: 46px; line-height: 1.2; }
.proof-head p { margin: 18px 0 0; color: var(--muted); font-size: 18px; }
.proof-rail { margin-top: 44px; display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.proof-item { min-width: 0; background: #fff; }
.proof-item img { width: 100%; height: 188px; object-fit: cover; object-position: top center; }
.proof-item div { padding: 18px; border-top: 1px solid var(--line); }
.proof-item strong { display: block; font-size: 16px; }
.proof-item span { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; }

.service-split { display: grid; grid-template-columns: 1fr 1fr; }
.service-panel { min-height: 390px; padding: 64px max(48px, calc((100vw - 1200px)/2)); display: flex; flex-direction: column; justify-content: center; }
.service-panel.support { background: var(--surface-blue); border-top: 1px solid #d5e5ff; border-bottom: 1px solid #d5e5ff; }
.service-panel.custom { background: var(--charcoal); color: #fff; }
.service-panel h2 { margin: 0; font-size: 40px; line-height: 1.2; }
.service-panel p { margin: 18px 0 0; max-width: 520px; font-size: 18px; color: var(--muted); }
.service-panel.custom p { color: #b8c0cd; }
.service-panel .actions { margin-top: 30px; }
.service-note { margin-top: 24px; color: #68778c; font-size: 14px; }
.service-panel.custom .service-note { color: #8f9aab; }

.about-band { padding: 70px 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.about-grid h2 { margin: 0; font-size: 38px; }
.about-grid p { margin: 16px 0 0; color: var(--muted); }
.about-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.about-list div { display: flex; justify-content: space-between; gap: 24px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.about-list span { color: var(--muted); }

.detail-hero { padding: 72px 0 62px; border-bottom: 1px solid var(--line); }
.detail-grid { display: grid; grid-template-columns: .86fr 1.14fr; gap: 72px; align-items: center; }
.back-link { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-weight: 750; margin-bottom: 24px; }
.back-link svg { width: 18px; height: 18px; }
.detail-hero h1 { margin: 0; font-size: 54px; line-height: 1.14; }
.detail-hero .lead { margin: 22px 0 0; color: var(--muted); font-size: 18px; }
.detail-meta { margin: 26px 0 0; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); border-top: 1px solid var(--line); }
.detail-meta div { padding: 15px 0; border-bottom: 1px solid var(--line); }
.detail-meta span { display: block; color: var(--muted); font-size: 13px; }
.detail-meta strong { display: block; margin-top: 2px; font-size: 15px; }
.detail-visual img { width: 100%; max-height: 520px; object-fit: contain; border: 1px solid var(--line); background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); }

.video-wrap { display: grid; grid-template-columns: 1.38fr .62fr; gap: 42px; align-items: start; }
.video-shell { border: 1px solid var(--line); background: #05070a; border-radius: var(--radius); overflow: hidden; }
.video-shell video { width: 100%; aspect-ratio: 16/9; background: #000; }
.video-info h2 { margin: 0; font-size: 34px; }
.video-info p { margin: 15px 0 0; color: var(--muted); }
.video-points { margin: 26px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.video-points li { padding: 14px 0; border-bottom: 1px solid var(--line); }

.feature-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 72px; }
.feature-layout h2 { margin: 0; font-size: 40px; }
.feature-layout > div:first-child p { color: var(--muted); }
.feature-list { border-top: 1px solid var(--line); }
.feature-item { display: grid; grid-template-columns: 54px 1fr; gap: 20px; padding: 25px 0; border-bottom: 1px solid var(--line); }
.feature-item b { color: var(--blue); font-size: 14px; }
.feature-item h3 { margin: 0; font-size: 21px; }
.feature-item p { margin: 7px 0 0; color: var(--muted); }

.gallery-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 14px; }
.gallery-grid .gallery-stack { display: grid; gap: 14px; }
.gallery-button { width: 100%; border: 0; padding: 0; background: transparent; text-align: left; }
.gallery-button img { width: 100%; height: 100%; max-height: 610px; object-fit: contain; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.gallery-button:hover img, .gallery-button:focus-visible img { border-color: var(--blue); }
.gallery-button span { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; }

.download-band { padding: 72px 0; background: var(--charcoal); color: #fff; }
.download-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.download-grid h2 { margin: 0; font-size: 40px; }
.download-grid p { margin: 16px 0 0; color: #b9c1cd; }
.download-facts { border-top: 1px solid #3a404b; }
.download-facts div { padding: 14px 0; display: flex; justify-content: space-between; gap: 24px; border-bottom: 1px solid #3a404b; }
.download-facts span { color: #9ea8b6; }
.download-warning { margin-top: 20px; padding-left: 14px; border-left: 3px solid #f0b429; color: #d9dee7; font-size: 14px; }

.support-strip { padding: 62px 0; background: var(--surface-blue); border-bottom: 1px solid #d5e5ff; }
.support-strip-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.support-strip h2 { margin: 0; font-size: 32px; }
.support-strip p { margin: 8px 0 0; color: var(--muted); }

.site-footer { padding: 34px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.footer-filings { display: inline-flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px; }
.public-security-filing { display: inline-flex; align-items: center; gap: 5px; }
.public-security-filing img { width: 20px; height: 22px; object-fit: contain; flex: 0 0 auto; }
.site-footer a:hover { color: var(--blue); }

.modal { position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center; padding: 24px; background: rgba(11,16,24,.72); }
.modal.open { display: flex; }
.modal-dialog { width: min(880px,100%); max-height: calc(100vh - 48px); overflow: auto; background: #fff; border-radius: 6px; box-shadow: 0 28px 80px rgba(0,0,0,.3); }
.modal-dialog.custom-dialog { background: #1b1f27; color: #fff; }
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 26px 30px; border-bottom: 1px solid var(--line); }
.custom-dialog .modal-head { border-color: #343a46; }
.modal-head h2 { margin: 0; font-size: 28px; }
.icon-button { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 4px; background: transparent; color: inherit; }
.custom-dialog .icon-button { border-color: #48505e; }
.icon-button svg { width: 20px; height: 20px; }
.modal-body { padding: 30px; }
.modal-intro { margin: 0 0 24px; color: var(--muted); }
.custom-dialog .modal-intro { color: #b6bfcc; }
.contact-layout { display: grid; grid-template-columns: 220px 1fr; gap: 30px; }
.qr { border: 1px solid var(--line); background: #fff; padding: 12px; }
.qr img { width: 100%; aspect-ratio: 1/1.18; object-fit: cover; object-position: center; }
.contact-lines { display: grid; align-content: start; border-top: 1px solid var(--line); }
.custom-dialog .contact-lines { border-color: #39404c; }
.contact-lines div { display: grid; grid-template-columns: 110px 1fr; gap: 18px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.custom-dialog .contact-lines div { border-color: #39404c; }
.contact-lines span { color: var(--muted); }
.custom-dialog .contact-lines span { color: #929cab; }
.request-template { width: 100%; min-height: 190px; margin-top: 24px; padding: 16px; resize: vertical; border: 1px solid var(--line); border-radius: 4px; background: var(--surface); color: var(--ink); line-height: 1.8; }
.custom-dialog .request-template { background: #12151b; border-color: #3d4552; color: #edf1f7; }
.modal-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.copy-status { min-height: 24px; margin: 10px 0 0; color: var(--green); }

.lightbox { position: fixed; inset: 0; z-index: 110; display: none; align-items: center; justify-content: center; padding: 30px; background: rgba(5,8,13,.9); }
.lightbox.open { display: flex; }
.lightbox img { max-width: 94vw; max-height: 90vh; object-fit: contain; background: #fff; }
.lightbox .icon-button { position: absolute; top: 22px; right: 22px; color: #fff; border-color: #768092; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .reveal { opacity: 1; transform: none; transition: none; } }

@media (max-width: 960px) {
  .wrap { width: min(calc(100% - 32px), 760px); }
  .menu-button { display: inline-flex; }
  .nav-links { position: absolute; left: 0; right: 0; top: 74px; display: none; padding: 14px 16px 20px; background: #fff; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 0; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 8px; border-bottom: 1px solid var(--line); }
  .nav-links .nav-action { margin-top: 10px; text-align: center; }
  .hero { padding-top: 54px; }
  .hero-grid, .detail-grid, .video-wrap, .feature-layout, .download-grid, .about-grid { grid-template-columns: 1fr; gap: 46px; }
  .hero h1 { font-size: 52px; }
  .hero-media { max-width: 720px; }
  .product-row, .product-row.reverse { grid-template-columns: 1fr; gap: 34px; }
  .product-row.reverse .product-copy, .product-row.reverse .product-media { order: initial; }
  .proof-rail { grid-template-columns: 1fr 1fr; }
  .service-panel { padding: 54px 32px; }
  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-grid .gallery-stack { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .wrap { width: calc(100% - 28px); }
  .nav { min-height: 66px; }
  .brand { font-size: 21px; }
  .brand-mark { width: 34px; height: 34px; }
  .nav-links { top: 66px; }
  .hero { padding: 44px 0 34px; }
  .hero h1 { font-size: 41px; line-height: 1.2; }
  .hero-copy { font-size: 17px; }
  .hero-grid { gap: 36px; }
  .hero-media { gap: 8px; }
  .hero-shot { height: 118px; }
  .hero-shot:nth-child(2), .hero-shot:nth-child(3) { transform: translateY(12px); }
  .section { padding: 64px 0; }
  .section-title { align-items: start; flex-direction: column; margin-bottom: 34px; }
  .section-title h2, .proof-head h2 { font-size: 34px; }
  .product-row { padding: 46px 0; }
  .product-copy h3 { font-size: 29px; }
  .product-actions .btn, .product-actions .text-link { width: 100%; justify-content: center; }
  .proof-rail { grid-template-columns: 1fr; }
  .proof-item img { height: 210px; }
  .service-split { grid-template-columns: 1fr; }
  .service-panel { min-height: 330px; padding: 48px 24px; }
  .service-panel h2 { font-size: 34px; }
  .about-grid { gap: 36px; }
  .about-list div { flex-direction: column; gap: 2px; }
  .detail-hero { padding: 44px 0; }
  .detail-hero h1 { font-size: 40px; }
  .detail-meta { grid-template-columns: 1fr; }
  .feature-layout h2, .download-grid h2 { font-size: 34px; }
  .feature-item { grid-template-columns: 42px 1fr; gap: 12px; }
  .gallery-grid .gallery-stack { grid-template-columns: 1fr; }
  .support-strip-inner, .footer-inner { align-items: flex-start; flex-direction: column; }
  .footer-filings { justify-content: flex-start; }
  .contact-layout { grid-template-columns: 1fr; }
  .qr { width: min(240px,100%); margin: 0 auto; }
  .contact-lines div { grid-template-columns: 1fr; gap: 3px; }
  .modal { padding: 12px; }
  .modal-dialog { max-height: calc(100vh - 24px); }
  .modal-head, .modal-body { padding: 22px; }
}