:root {
  --blue: #2e78f7;
  --deep-blue: #1152b8;
  --ink: #172f56;
  --purple: #11082f;
  --page-width: 1530px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; color: var(--ink); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; background: #fff; }
button, a { font: inherit; }
button { cursor: pointer; }
img { display: block; max-width: 100%; }

.site-header { position: absolute; inset: 0 0 auto; z-index: 10; width: min(1740px, calc(100% - 110px)); height: 100px; margin: auto; display: flex; align-items: center; justify-content: space-between; }
.brand-mark img { width: 68px; height: 62px; object-fit: contain; }
.main-nav { display: flex; align-items: center; gap: 12px; }
.main-nav a { min-width: 94px; padding: 9px 14px; border-radius: 20px; color: #5d6f87; font-size: 14px; text-align: center; text-decoration: none; transition: .25s ease; }
.main-nav a:hover, .main-nav a.active { color: #fff; background: var(--blue); box-shadow: 0 4px 10px #4d83e94d; }

.hero { min-height: 900px; background: #eef8ff url("首页素材/头部背景@2x.png") center -96px / cover no-repeat; overflow: hidden; }
.hero-inner { width: min(1740px, calc(100% - 160px)); margin: auto; padding-top: 205px; display: flex; justify-content: space-between; align-items: flex-start; }
.hero-copy { width: 930px; }
.hot-row { position: relative; width: 422px; height: 37px; }
.hot-badge { position: absolute; inset: 0; width: 422px; height: 37px; object-fit: contain; object-position: left center; }
.hot-row span { position: absolute; top: 8px; left: 95px; color: #fff; font-size: 13px; line-height: 21px; white-space: nowrap; }
.hero h1 { margin: 52px 0 42px 40px; font-size: 36px; font-weight: 700; line-height: 1; background: linear-gradient(180deg, #73c5ff 0%, #3c8df7 52%, #2b66df 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-card { width: 930px; min-height: 284px; padding: 31px 38px 22px; color: #385474; font-size: 16px; line-height: 1.55; background: rgba(255, 255, 255, .24) url("首页素材/头部卡片1@2x.png") center / 100% 100% no-repeat; box-shadow: inset 0 1px 0 rgba(255, 255, 255, .58), 0 18px 50px rgba(61, 142, 210, .08); -webkit-backdrop-filter: blur(10px) saturate(1.06); backdrop-filter: blur(10px) saturate(1.06); }
.hero-card p { margin: 4px 0; }
.hero-card strong { color: #1c3b63; font-size: 19px; }
.hero-card em { color: #ff6f27; font-style: normal; font-weight: 700; }
.qr-panel { position: relative; width: 470px; height: 493px; margin-top: 15px; text-align: center; }
.qr-art { width: 423px; height: 423px; margin: 0 auto; padding: 44px 44px 0; background: url("首页素材/二维码底部卡片@2x.png") center / 100% 100% no-repeat; }
.qr-code { width: 232px; height: 227px; margin: 0 auto; }
.qr-panel p { position: absolute; top: 326px; right: 0; left: 0; width: fit-content; margin: 0 auto; color: #4970a4; font-size: 14px; }
.qr-panel p::after { content: ""; position: absolute; right: -15px; bottom: 3px; width: 7px; height: 7px; background: #5e9bff; }
.hero-cta { position: absolute; top: 380px; left: 10px; isolation: isolate; overflow: hidden; display: flex; width: 450px; height: 70px; margin: 0; align-items: center; justify-content: space-between; padding: 0 42px; border: 1px solid rgba(255, 255, 255, .68); border-radius: 10px; color: #fff; font-size: 17px; font-weight: 700; line-height: 1; text-decoration: none; background: linear-gradient(100deg, rgba(43, 101, 241, .8), rgba(19, 183, 232, .72)); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .65), inset 0 -1px 0 rgba(15, 89, 193, .22), 0 12px 28px rgba(35, 118, 233, .32); -webkit-backdrop-filter: blur(16px) saturate(1.35); backdrop-filter: blur(16px) saturate(1.35); transition: filter .18s ease, box-shadow .18s ease; }
.hero-cta::before { position: absolute; z-index: 0; top: 1px; right: 1px; left: 1px; height: 48%; border-radius: 9px 9px 55% 55%; content: ""; pointer-events: none; background: linear-gradient(180deg, rgba(255, 255, 255, .26), rgba(255, 255, 255, 0)); }
.hero-cta:hover { filter: brightness(1.06); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .78), inset 0 -1px 0 rgba(15, 89, 193, .2), 0 14px 32px rgba(35, 118, 233, .38); }
.hero-cta > span { position: relative; z-index: 1; }
.hero-cta .button-arrow { width: 18px; height: 24px; flex: 0 0 18px; border: 0; background: #fff; }
.hero-cta .button-arrow-left { clip-path: polygon(0 0, 100% 50%, 0 100%); }
.hero-cta .button-arrow-right { clip-path: polygon(100% 0, 0 50%, 100% 100%); }
.hero-cta > span:nth-child(2) { flex: 1; text-align: center; }

.section { position: relative; width: 100%; }
.section-title { position: absolute; left: 50%; z-index: 1; transform: translateX(-50%); object-fit: contain; }
.intro { min-height: 1160px; padding-top: 115px; background: linear-gradient(#fff, #f1f8ff); }
.title-intro { top: 40px; width: 465px; height: 87px; }
.stats { width: min(1380px, calc(100% - 260px)); margin: 25px auto 75px; display: flex; justify-content: space-between; }
.stat-card { width: 390px; height: 170px; padding-top: 38px; border-radius: 17px; color: #fff; text-align: center; background: linear-gradient(180deg, #0e4e95, #1e5fd0); box-shadow: 10px 13px 0 #dcecff; }
.stat-card strong { display: block; font-size: 42px; line-height: 1.3; }
.stat-card span { font-size: 14px; }
.carousel { position: relative; width: min(var(--page-width), calc(100% - 160px)); margin: auto; background: #e7f4ff; border-radius: 20px; }
.carousel-main { height: 720px; padding: 36px 0 50px; display: flex; align-items: center; justify-content: center; }
.carousel-window { width: 1200px; height: 640px; overflow: hidden; border-radius: 20px; }
.carousel-track, .partner-track { display: flex; height: 100%; transition: transform .5s ease; }
.carousel-track img { flex: 0 0 1200px; width: 1200px; height: 640px; object-fit: cover; }
.carousel-arrow, .product-arrow { position: absolute; top: 50%; width: 56px; height: 56px; transform: translateY(-50%); border: 0; border-radius: 50%; color: transparent; font-size: 0; line-height: 0; background: #f7fbff; box-shadow: 0 5px 16px #b5d0ef80; }
.carousel-arrow::before, .product-arrow::before { content: ""; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 0; height: 0; border-top: 9px solid transparent; border-bottom: 9px solid transparent; }
.carousel-arrow.prev::before, .product-arrow:first-child::before { border-right: 13px solid #3a82ed; margin-left: -2px; }
.carousel-arrow.next::before, .product-arrow:last-child::before { border-left: 13px solid #3a82ed; margin-left: 2px; }
.carousel-arrow.prev { left: 32px; }
.carousel-arrow.next { right: 32px; }
.carousel-dots { position: absolute; bottom: 38px; display: flex; gap: 10px; }
.carousel-dots i { width: 8px; height: 8px; border-radius: 50%; background: #c0d8f7; }
.carousel-dots i.selected { background: var(--blue); }

.cooperation { min-height: 1030px; padding-top: 150px; background: #fff; }
.title-cooperation { top: 42px; width: 437px; height: 87px; }
.segmented-control { width: 390px; height: 57px; margin: 0 auto 80px; display: flex; border-radius: 28px; background: #fff; box-shadow: 0 4px 18px #9eb0c433; overflow: hidden; }
.segmented-control button { flex: 1; border: 0; color: #6d7788; font-size: 16px; background: transparent; }
.segmented-control button.selected { color: #fff; background: var(--blue); }
.partner-window { width: min(1560px, calc(100% - 80px)); height: 581px; margin: auto; overflow: hidden; border-radius: 22px; box-shadow: 0 8px 22px #b7c2d34d; }
.partner-track img { flex: 0 0 100%; width: 100%; height: 581px; object-fit: cover; }

.history { min-height: 1050px; padding-top: 170px; background: linear-gradient(#fff, #eef5ff); }
.title-history { top: 55px; width: 723px; height: 87px; }
.history-grid { width: min(1660px, calc(100% - 120px)); margin: auto; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.history-grid img { width: 100%; height: auto; border-radius: 18px; box-shadow: 0 12px 30px #8397b833; }

.advantages { min-height: 880px; padding-top: 165px; color: #fff; background: var(--purple); }
.advantages-heading { position: absolute; top: 55px; left: 50%; transform: translateX(-50%); color: #24305e; text-align: center; white-space: nowrap; }
.advantages-heading span { display: block; font-size: 47px; font-weight: 800; letter-spacing: 1px; }
.advantages-heading strong { display: block; margin-top: -33px; color: #fff; font-size: 26px; }
.advantage-grid { width: min(1730px, calc(100% - 100px)); margin: 0 auto 42px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.advantage-card { min-height: 285px; padding: 28px 40px 25px; border: 1px solid #283064; border-radius: 8px; text-align: center; background: #130d40; box-shadow: inset 0 -4px 0 #17c9e6; }
.advantage-card:nth-child(2) { box-shadow: inset 0 -4px 0 #ffc72c; }
.advantage-card img { width: 114px; height: 114px; margin: 0 auto 12px; }
.advantage-card h3 { margin: 0 0 14px; font-size: 18px; }
.advantage-card p { margin: 0 auto; max-width: 33ch; color: #a4a8cf; font-size: 12px; line-height: 1.8; }
.advantage-metrics { width: min(1730px, calc(100% - 100px)); min-height: 150px; margin: auto; padding: 30px 130px; display: flex; justify-content: space-between; border-radius: 0 100px 0 100px; background: linear-gradient(100deg, #073c73, #172e9e); }
.advantage-metrics div { min-width: 180px; text-align: center; border-right: 1px solid #6684d2; }
.advantage-metrics div:last-child { border-right: 0; }
.advantage-metrics strong, .advantage-metrics span { display: block; }
.advantage-metrics strong { font-size: 32px; }
.advantage-metrics span { margin-top: 8px; color: #c7d4ff; font-size: 14px; }
.advantages h2 { margin: 55px 0 0; text-align: center; font-size: 27px; }

.products { min-height: 780px; padding-top: 180px; background: linear-gradient(#f6faff, #fff); }
.title-products { top: 60px; width: 439px; height: 116px; }
.product-carousel { position: relative; width: min(1600px, calc(100% - 220px)); margin: auto; display: flex; align-items: center; justify-content: center; }
.product-window { width: 1320px; overflow: hidden; }
.product-track { --product-gap: 36px; width: max-content; display: flex; gap: var(--product-gap); transition: transform .5s ease; }
.product-track article { flex: 0 0 390px; min-height: 480px; padding: 0 0 18px; border-radius: 8px; background: #f8fbff; }
.product-media { width: 390px; height: 300px; overflow: hidden; }
.product-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.product-track h3 { margin: 25px 28px 10px; color: #193b68; font-size: 20px; }
.product-track p { margin: 0 28px; color: #77869a; font-size: 13px; }
.product-arrow { position: relative; flex: 0 0 56px; margin: 0 22px; transform: none; }

.join { min-height: 310px; padding: 82px 20px; color: #fff; text-align: center; background: #216bf1; }
.join p { margin: 0 0 18px; font-size: 18px; }
.join strong { display: block; font-size: 20px; }
.join a { display: inline-block; margin-top: 25px; padding: 11px 18px; border-radius: 20px; color: #1762e5; font-size: 13px; font-weight: 700; text-decoration: none; background: #fff; }
.site-footer { min-height: 245px; padding: 54px max(80px, calc((100% - 1700px) / 2)); display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 80px; color: #fff; background: var(--purple); }
.footer-brand, .footer-contact, .footer-qr { min-height: 130px; }
.footer-brand { display: flex; align-items: center; gap: 32px; }
.footer-brand img { width: 68px; height: 62px; }
.footer-brand p, .footer-contact p { color: #d8d5e6; font-size: 12px; line-height: 1.8; }
.footer-contact, .footer-qr { padding-left: 45px; border-left: 1px solid #342a5a; }
.site-footer h2 { margin: 0 0 24px; font-size: 15px; }
.footer-contact { display: flex; flex-wrap: wrap; gap: 12px 40px; }
.footer-contact h2 { flex-basis: 100%; }
.footer-qr img { display: inline-block; width: 78px; height: 78px; margin-right: 14px; background: #fff; }
.floating-contact { position: fixed; z-index: 20; right: 0; top: 52%; padding: 10px 15px 10px 16px; border-radius: 25px 0 0 25px; color: #fff; font-size: 13px; text-decoration: none; background: #164ca9; box-shadow: 0 3px 12px #174da966; }
.back-top { position: fixed; right: 25px; bottom: 25px; z-index: 20; width: 42px; height: 42px; border: 0; border-radius: 50%; color: #fff; font-size: 22px; background: var(--blue); box-shadow: 0 5px 14px #1b64d766; opacity: 0; pointer-events: none; transition: opacity .2s; }
.back-top.visible { opacity: 1; pointer-events: auto; }

@media (min-width: 1201px) {
  .qr-panel { margin-top: 18px; }
}

@media (max-width: 1500px) {
  .hero-inner { width: calc(100% - 100px); }
  .hero-copy { width: 54vw; }
  .hero-card { width: 100%; font-size: 13px; }
  .qr-panel { right: -30px; transform: scale(.86); transform-origin: top right; }
}

@media (max-width: 1200px) {
  .site-header { width: calc(100% - 50px); }
  .hero-inner { width: calc(100% - 80px); }
  .hero-copy { width: 62%; }
  .hero-card { width: 100%; font-size: 16px; }
  .qr-panel { right: auto; width: 34%; transform: none; }
  .qr-panel { height: auto; }
  .qr-art { width: min(423px, 100%); height: auto; aspect-ratio: 1; padding: 10%; }
  .qr-code { width: 100%; height: auto; }
  .qr-panel p { position: relative; top: auto; right: auto; left: auto; margin: -12px auto 16px; }
  .hero-cta { position: relative; top: auto; left: auto; width: min(450px, 100%); height: 58px; margin: auto; font-size: 14px; }
  .carousel-window { width: 78%; }
  .carousel-track img { flex-basis: 100%; width: 100%; object-fit: contain; }
}

@media (min-width: 761px) and (max-width: 980px) {
  .stats {
    width: calc(100% - 80px);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .stat-card {
    width: auto;
    min-width: 0;
    height: 150px;
    padding-top: 30px;
  }

  .stat-card strong { font-size: 34px; }

  .advantage-grid {
    width: calc(100% - 80px);
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .advantage-card { padding-right: 24px; padding-left: 24px; }
  .advantage-card:last-child { grid-column: 1 / -1; width: calc(50% - 9px); justify-self: center; }

  .advantage-metrics {
    width: calc(100% - 80px);
    padding: 24px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 0;
    border-radius: 0 64px 0 64px;
  }

  .advantage-metrics div { width: auto; min-width: 0; }
  .advantage-metrics div:nth-child(2n) { border-right: 0; }
  .advantage-metrics div:nth-child(n+3) { padding-top: 18px; border-top: 1px solid #6684d2; }
}

@media (max-width: 760px) {
  .site-header { position: fixed; width: 100%; height: 68px; padding: 0 18px; background: #ffffffed; box-shadow: 0 2px 12px #5071a31c; }
  .brand-mark img { width: 50px; height: 46px; }
  .main-nav { gap: 0; overflow-x: auto; }
  .main-nav a { min-width: auto; padding: 7px 8px; font-size: 11px; }
  .hero { min-height: auto; padding: 120px 20px 70px; background-position: center top; }
  .hero-inner { width: 100%; padding: 0; display: block; }
  .hero-copy, .hero-card { width: 100%; }
  .hot-badge { width: min(422px, 100%); }
  .hot-row { width: min(422px, 100%); }
  .hot-row span { font-size: 10px; left: 88px; }
  .hero h1 { margin: 25px 0; font-size: 26px; }
  .hero-card { min-height: 0; padding: 30px 26px; font-size: 12px; }
  .hero-card strong { font-size: 15px; }
  .qr-panel { width: 100%; margin-top: 40px; }
  .qr-art { width: 310px; }
  .hero-cta { width: min(450px, 100%); }
  .intro { min-height: 1100px; padding-top: 130px; }
  .section-title { max-width: 85%; }
  .stats { width: calc(100% - 40px); display: grid; gap: 18px; margin-bottom: 55px; }
  .stat-card { width: 100%; height: 125px; padding-top: 22px; }
  .stat-card strong { font-size: 30px; }
  .carousel { width: calc(100% - 30px); }
  .carousel-main { height: 320px; padding: 16px 0 36px; }
  .carousel-window { width: calc(100% - 80px); height: auto; aspect-ratio: 1200 / 640; }
  .carousel-track img { height: auto; }
  .carousel-arrow { width: 44px; height: 44px; font-size: 32px; }
  .carousel-arrow.prev { left: 10px; }
  .carousel-arrow.next { right: 10px; }
  .cooperation { min-height: 670px; padding-top: 125px; }
  .segmented-control { width: calc(100% - 70px); margin-bottom: 40px; }
  .partner-window { width: calc(100% - 30px); height: auto; aspect-ratio: 1560 / 581; }
  .partner-track img { height: auto; }
  .history { min-height: auto; padding: 135px 20px 60px; }
  .history-grid { width: 100%; grid-template-columns: 1fr; gap: 20px; }
  .advantages { min-height: auto; padding: 140px 20px 55px; }
  .advantages-heading span { font-size: 30px; }
  .advantages-heading strong { margin-top: -21px; font-size: 19px; }
  .advantage-grid, .advantage-metrics { width: 100%; }
  .advantage-grid { grid-template-columns: 1fr; }
  .advantage-metrics { padding: 20px 8px; border-radius: 0 45px 0 45px; }
  .advantage-metrics div { min-width: 0; width: 25%; }
  .advantage-metrics strong { font-size: 17px; }
  .advantage-metrics span { font-size: 10px; }
  .advantages h2 { font-size: 22px; }
  .products { min-height: 590px; padding-top: 145px; }
  .product-carousel { width: 100%; }
  .product-window { width: 270px; }
  .product-track { --product-gap: 20px; }
  .product-track article { flex-basis: 270px; min-height: 390px; }
  .product-media { width: 270px; height: 208px; }
  .product-track h3 { margin: 18px 20px 8px; }
  .product-track p { margin: 0 20px; }
  .product-arrow { margin: 0 6px; width: 44px; height: 44px; font-size: 34px; }
  .join { min-height: 240px; padding: 55px 20px; }
  .join p { font-size: 15px; }
  .join strong { font-size: 13px; }
  .site-footer { padding: 40px 25px; display: block; }
  .footer-brand, .footer-contact, .footer-qr { margin-bottom: 30px; padding-left: 0; border-left: 0; }
  .floating-contact span { display: none; }
}