:root {
  --teal: #078c8b;
  --teal-dark: #075d67;
  --teal-deep: #064b55;
  --cyan: #14aeb8;
  --yellow: #ffd400;
  --ink: #20262b;
  --muted: #6f777b;
  --line: #e7ebed;
  --paper: #ffffff;
  --soft: #f5f8f8;
  --shadow: 0 18px 50px rgba(15, 51, 57, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.wrap { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 76px 0; }
.section--soft { background: var(--soft); }
.eyebrow { margin: 0 0 8px; color: var(--teal); font-size: .82rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.section-title { margin: 0 0 44px; text-align: center; color: var(--teal-dark); font-size: clamp(1.75rem, 3vw, 2.5rem); line-height: 1.25; }
.section-lead { max-width: 850px; margin: -24px auto 42px; color: var(--muted); text-align: center; }
.skip-link { position: fixed; z-index: 1000; top: 8px; left: 8px; transform: translateY(-150%); background: #fff; padding: 8px 14px; border-radius: 4px; box-shadow: var(--shadow); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: sticky; z-index: 100; top: 0; background: rgba(255,255,255,.96); border-bottom: 1px solid rgba(7,93,103,.09); backdrop-filter: blur(12px); }
.header-row { height: 90px; display: flex; align-items: center; justify-content: space-between; gap: 36px; }
.brand { flex: 0 0 auto; width: 196px; }
.brand img { width: 100%; height: 60px; object-fit: contain; }
.site-nav { display: flex; align-items: center; gap: 38px; font-size: 1rem; font-weight: 600; }
.site-nav a { position: relative; padding: 30px 0; color: #363b3e; }
.site-nav a::after { content: ""; position: absolute; right: 0; bottom: 21px; left: 0; height: 3px; transform: scaleX(0); background: var(--teal); transition: transform .2s ease; }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav-dropdown { position: relative; }
.nav-dropdown > button { border: 0; background: transparent; color: #363b3e; font-weight: 600; padding: 30px 0; }
.nav-dropdown > button::after { content: "⌄"; margin-left: 5px; color: var(--teal); }
.dropdown-menu { position: absolute; display: grid; min-width: 170px; top: 76px; left: 50%; transform: translate(-50%, 8px); padding: 8px; opacity: 0; visibility: hidden; background: #fff; border-radius: 6px; box-shadow: var(--shadow); transition: .2s ease; }
.nav-dropdown:hover .dropdown-menu, .nav-dropdown:focus-within .dropdown-menu { transform: translate(-50%, 0); opacity: 1; visibility: visible; }
.dropdown-menu a { padding: 9px 12px; border-radius: 4px; font-weight: 500; white-space: nowrap; }
.dropdown-menu a::after { display: none; }
.dropdown-menu a:hover { color: var(--teal); background: var(--soft); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; padding: 9px; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--teal-dark); transition: .2s ease; }

.hero { position: relative; overflow: hidden; background: #0561bd; }
.hero-track { position: relative; aspect-ratio: 1922 / 701; min-height: 360px; }
.hero-slide { position: absolute; inset: 0; opacity: 0; transition: opacity .7s ease; }
.hero-slide.is-active { opacity: 1; }
.hero-slide img { width: 100%; height: 100%; object-fit: cover; }
.hero-dots { position: absolute; z-index: 2; left: 50%; bottom: 22px; display: flex; gap: 12px; transform: translateX(-50%); }
.hero-dot { width: 11px; height: 11px; border: 2px solid rgba(255,255,255,.9); border-radius: 50%; padding: 0; background: transparent; }
.hero-dot.is-active { background: #fff; transform: scale(1.15); }

.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 56px 42px; }
.service-card { text-align: center; }
.service-icon { width: 160px; height: 124px; margin: 0 auto 18px; object-fit: cover; object-position: center; border-radius: 4px; }
.service-card h3 { margin: 0 0 8px; font-size: 1.35rem; line-height: 1.35; }
.service-card p { margin: 0 auto; max-width: 340px; color: var(--muted); line-height: 1.75; }

.advantage-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.advantage-card { position: relative; min-height: 360px; overflow: hidden; border-radius: 3px; background: #0ba8b1; color: #fff; }
.advantage-card img { width: 100%; height: 100%; object-fit: cover; }
.advantage-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 18%, rgba(3,47,53,.78) 100%); }
.advantage-copy { position: absolute; z-index: 1; right: 18px; bottom: 20px; left: 18px; }
.advantage-copy h3 { margin: 0 0 8px; font-size: 1.2rem; }
.advantage-copy p { margin: 0; font-size: .92rem; line-height: 1.6; }

.feature-stack { display: grid; gap: 0; }
.feature-banner { width: 100%; aspect-ratio: 2897 / 1032; object-fit: cover; }
.solution-copy { max-width: 960px; margin: 42px auto 28px; text-align: center; color: #4f575a; font-size: 1.08rem; }
.solution-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; max-width: 680px; margin: 0 auto 26px; background: #fff; }
.solution-tab { border: 0; padding: 17px 12px; color: #fff; background: var(--teal-dark); font-weight: 800; font-size: 1.06rem; }
.solution-tab:nth-child(2) { background: #e899c0; }
.solution-tab:nth-child(3) { background: #f6be24; }
.solution-tab:nth-child(4) { background: #115563; }
.solution-tab[aria-selected="true"] { box-shadow: inset 0 -5px 0 var(--yellow); }
.solution-panel { display: none; }
.solution-panel.is-active { display: block; }
.solution-panel img { width: min(100%, 1120px); margin: 0 auto; }

.contact-band { background: linear-gradient(135deg, var(--teal-deep), #0d7680); color: #fff; }
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.contact-form h2 { margin: 0 0 28px; color: #fff; font-size: 2rem; }
.form-grid { display: grid; gap: 18px; }
.field label { display: block; margin-bottom: 6px; font-weight: 700; }
.field input, .field textarea { width: 100%; border: 1px solid rgba(255,255,255,.28); border-radius: 4px; background: rgba(255,255,255,.1); color: #fff; padding: 12px 14px; outline: none; }
.field input:focus, .field textarea:focus { border-color: var(--yellow); box-shadow: 0 0 0 3px rgba(255,212,0,.16); }
.field input::placeholder, .field textarea::placeholder { color: rgba(255,255,255,.58); }
.submit-btn { justify-self: start; border: 0; border-radius: 3px; background: var(--yellow); color: #17343a; font-weight: 800; padding: 12px 30px; }
.form-status { min-height: 28px; margin: 8px 0 0; color: #fff; }
.hotline { text-align: center; border-left: 1px solid rgba(255,255,255,.35); padding: 46px 20px; }
.phone-mark { display: grid; width: 108px; height: 108px; margin: 0 auto 20px; place-items: center; border: 4px solid currentColor; border-radius: 50%; font-size: 3rem; }
.hotline p { margin: 0 0 4px; }
.hotline a { display: block; color: var(--yellow); font-size: clamp(2rem, 4vw, 3.15rem); font-weight: 900; letter-spacing: -.04em; }

.page-hero { position: relative; min-height: 330px; display: grid; align-items: end; overflow: hidden; background: var(--teal-deep); }
.page-hero img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.page-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,51,58,.72), rgba(0,51,58,.06)); }
.page-hero__copy { position: relative; z-index: 1; padding: 48px 0; color: #fff; }
.page-hero h1 { margin: 0; font-size: clamp(2.3rem, 5vw, 4.4rem); line-height: 1.1; }
.page-hero p { margin: 10px 0 0; font-size: 1.15rem; }
.prose { max-width: 940px; margin: 0 auto; color: #4c5457; }
.prose h2 { margin: 0 0 24px; color: var(--teal-dark); font-size: 2rem; }
.prose p { margin: 0 0 20px; }
.stat-ribbon { width: min(100%, 960px); margin: 36px auto 0; }
.media-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 42px; }
.media-pair img { width: 100%; height: 310px; object-fit: cover; }
.infographic { width: min(100%, 1226px); margin: 0 auto; }
.info-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.info-card { padding: 28px; border: 1px solid var(--line); background: #fff; }
.info-card strong { display: block; margin-bottom: 8px; color: var(--teal); font-size: 1.15rem; }
.news-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.news-item { display: grid; grid-template-columns: 180px 1fr; gap: 26px; padding: 24px; background: #fff; }
.news-item img { width: 180px; height: 116px; object-fit: cover; }
.news-item h2 { margin: 0 0 6px; font-size: 1.2rem; }
.news-item p { margin: 0; color: var(--muted); }
.contact-details { display: grid; grid-template-columns: 1fr 1.35fr; gap: 44px; align-items: center; }
.contact-details h2 { color: var(--teal-dark); font-size: 2rem; }
.contact-details address { font-style: normal; color: #4f575a; }
.map-frame { overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow); }
.map-frame img { width: 100%; min-height: 340px; object-fit: cover; }

.floating-tools { position: fixed; z-index: 90; right: 18px; bottom: 28px; display: grid; gap: 8px; }
.floating-tools a { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 4px; background: #0aa4d8; color: #fff; box-shadow: 0 10px 26px rgba(0,0,0,.15); font-size: 1.3rem; }
.floating-tools a:last-child { background: #111; }

.site-footer { background: var(--teal-dark); color: rgba(255,255,255,.78); }
.footer-inner { padding: 34px 0 28px; text-align: center; }
.footer-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px 38px; margin-bottom: 18px; color: #fff; }
.site-footer p { margin: 4px 0; font-size: .92rem; }
.site-footer a:hover { color: var(--yellow); }

@media (max-width: 960px) {
  .header-row { height: 72px; }
  .brand { width: 165px; }
  .brand img { height: 50px; }
  .menu-toggle { display: block; }
  .site-nav { position: fixed; top: 72px; right: 0; left: 0; display: none; align-items: stretch; gap: 0; padding: 12px 20px 22px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 16px 30px rgba(0,0,0,.08); }
  .site-nav.is-open { display: grid; }
  .site-nav a, .nav-dropdown > button { display: block; width: 100%; padding: 12px 6px; text-align: left; }
  .site-nav a::after { bottom: 7px; }
  .dropdown-menu { position: static; display: grid; min-width: 0; transform: none; opacity: 1; visibility: visible; padding: 0 0 4px 20px; box-shadow: none; }
  .nav-dropdown:hover .dropdown-menu, .nav-dropdown:focus-within .dropdown-menu { transform: none; }
  .hero-track { min-height: 300px; }
  .hero-slide img { object-position: center; }
  .advantage-grid { grid-template-columns: repeat(3, 1fr); }
  .advantage-card { min-height: 330px; }
  .contact-layout, .contact-details { grid-template-columns: 1fr; gap: 36px; }
  .hotline { border-top: 1px solid rgba(255,255,255,.35); border-left: 0; }
}

@media (max-width: 720px) {
  .wrap { width: min(100% - 28px, 1180px); }
  .section { padding: 54px 0; }
  .section-title { margin-bottom: 32px; }
  .hero-track { aspect-ratio: 4 / 3; min-height: 0; }
  .hero-slide img { object-position: 62% center; }
  .service-grid { grid-template-columns: 1fr 1fr; gap: 38px 18px; }
  .service-icon { width: 128px; height: 100px; }
  .service-card h3 { font-size: 1.1rem; }
  .service-card p { font-size: .9rem; }
  .advantage-grid { grid-template-columns: 1fr; }
  .advantage-card { min-height: 280px; }
  .solution-tabs { grid-template-columns: 1fr 1fr; }
  .feature-banner { aspect-ratio: 1.85 / 1; }
  .page-hero { min-height: 280px; }
  .page-hero__copy { padding: 34px 0; }
  .media-pair, .info-cards { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; }
  .news-item img { width: 100%; height: 200px; }
  .floating-tools { right: 10px; bottom: 12px; }
  .floating-tools a { width: 44px; height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}