:root {
  --ink: #15213d;
  --muted: #5b6780;
  --blue: #1769e8;
  --blue-deep: #0b3f99;
  --cyan: #10a9c7;
  --green: #0f9f78;
  --line: #dce3ef;
  --soft: #f3f6fb;
  --white: #fff;
  --shell: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

.site-header { position: sticky; top: 0; z-index: 50; height: 72px; background: rgba(255,255,255,.96); border-bottom: 1px solid rgba(220,227,239,.8); backdrop-filter: blur(14px); }
.nav-shell { width: min(var(--shell), calc(100% - 40px)); height: 100%; margin: 0 auto; display: flex; align-items: center; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 188px; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; color: #fff; background: var(--blue); font-size: 15px; font-weight: 800; border-radius: 5px; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.15; }
.brand-copy strong { font-size: 19px; }
.brand-copy small { margin-top: 4px; color: #6f7d97; font-size: 9px; font-weight: 700; letter-spacing: 1.4px; }
.main-nav { display: flex; align-items: center; justify-content: center; gap: 30px; flex: 1; height: 100%; }
.main-nav a { position: relative; height: 100%; display: grid; place-items: center; color: #33405b; font-size: 14px; white-space: nowrap; }
.main-nav a::after { content: ""; position: absolute; left: 50%; bottom: 0; width: 0; height: 3px; background: var(--blue); transition: width .2s ease, left .2s ease; }
.main-nav a:hover::after, .main-nav a.active::after { left: 0; width: 100%; }
.main-nav a.active { color: var(--blue); font-weight: 700; }
.nav-cta { display: inline-flex; align-items: center; justify-content: center; min-width: 102px; height: 40px; padding: 0 18px; color: #fff; background: var(--blue); border-radius: 4px; font-size: 14px; font-weight: 700; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 9px; border: 0; background: transparent; }
.menu-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: var(--ink); }

.hero { position: relative; height: min(720px, calc(100svh - 96px)); min-height: 560px; overflow: hidden; color: #fff; background: #071b3a; }
.hero-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .6s ease, visibility .6s ease; background-image: linear-gradient(90deg, rgba(3,17,43,.88) 0%, rgba(3,22,55,.62) 48%, rgba(3,22,55,.2) 78%), var(--hero-image); background-position: center; background-size: cover; }
.hero-slide.active { opacity: 1; visibility: visible; }
.hero-inner { width: min(var(--shell), calc(100% - 40px)); height: 100%; margin: 0 auto; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding-bottom: 25px; }
.eyebrow, .section-kicker { margin: 0 0 15px; color: #4eb9ff; font-size: 12px; font-weight: 800; letter-spacing: 2px; }
.hero h1, .hero h2 { max-width: 760px; margin: 0; font-size: 54px; line-height: 1.18; font-weight: 760; letter-spacing: 0; }
.hero-lead { max-width: 650px; margin: 24px 0 0; color: rgba(255,255,255,.82); font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; }
.button { min-width: 130px; height: 46px; padding: 0 24px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 4px; font-size: 14px; font-weight: 700; transition: transform .2s ease, background .2s ease, color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--blue); border-color: var(--blue); }
.button-primary:hover { background: #0d57c9; }
.button-ghost { color: #fff; border-color: rgba(255,255,255,.68); background: rgba(255,255,255,.07); }
.button-ghost:hover { background: rgba(255,255,255,.15); }
.button-outline { color: var(--blue); border-color: var(--blue); background: #fff; }
.button-white { color: var(--blue-deep); background: #fff; }
.hero-dots { position: absolute; left: 50%; bottom: 28px; display: flex; gap: 10px; transform: translateX(-50%); }
.hero-dots button { width: 32px; height: 4px; padding: 0; border: 0; border-radius: 0; background: rgba(255,255,255,.4); cursor: pointer; }
.hero-dots button.active { background: #fff; }

.section { padding: 94px 0; }
.section-shell { width: min(var(--shell), calc(100% - 40px)); margin: 0 auto; }
.section-heading { max-width: 700px; margin: 0 auto 48px; text-align: center; }
.section-heading .section-kicker { color: var(--blue); }
.section-heading h2, .news-heading h2, .scene-copy h2, .contact-inner h2 { margin: 0; font-size: 36px; line-height: 1.3; }
.section-heading > p:last-child { margin: 15px auto 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product-card { position: relative; min-height: 330px; padding: 38px 34px; border: 1px solid var(--line); border-radius: 6px; background: #fff; overflow: hidden; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.product-card:hover { transform: translateY(-6px); border-color: #a9c8f8; box-shadow: 0 18px 42px rgba(34,64,110,.12); }
.product-card.featured { border-top: 4px solid var(--blue); padding-top: 35px; }
.product-index { position: absolute; top: 26px; right: 28px; color: #d6e2f5; font-size: 36px; font-weight: 800; }
.product-icon { position: relative; width: 62px; height: 62px; margin-bottom: 27px; border-radius: 6px; background: #eaf2ff; }
.product-icon span { position: absolute; inset: 16px; border: 3px solid var(--blue); }
.product-icon-live span { border-radius: 50%; }
.product-icon-speed span { border-radius: 50% 50% 4px 50%; transform: rotate(45deg); }
.product-icon-device span { border-radius: 3px; border-width: 3px 3px 6px; }
.product-card h3 { margin: 0; font-size: 22px; }
.product-card p { min-height: 76px; margin: 16px 0 20px; color: var(--muted); font-size: 14px; line-height: 1.8; }
.product-card a, .text-link { color: var(--blue); font-size: 14px; font-weight: 700; }

.scene-band { display: grid; grid-template-columns: 1.04fr .96fr; min-height: 650px; background: #101d35; color: #fff; }
.scene-image { min-height: 520px; background: linear-gradient(rgba(4,19,43,.2), rgba(4,19,43,.3)), url("assets/data-center.jpg") center/cover; }
.scene-copy { display: flex; flex-direction: column; justify-content: center; padding: 70px max(40px, calc((100vw - var(--shell)) / 2)); }
.scene-copy .section-kicker { color: #46c2d8; }
.scene-copy h2 { font-size: 38px; }
.scene-list { margin: 34px 0 28px; border-top: 1px solid rgba(255,255,255,.14); }
.scene-list article { display: flex; gap: 22px; padding: 22px 0; border-bottom: 1px solid rgba(255,255,255,.14); }
.scene-list article > span { color: #4fb6ff; font-size: 13px; font-weight: 800; }
.scene-list h3 { margin: 0 0 8px; font-size: 17px; }
.scene-list p { margin: 0; color: rgba(255,255,255,.65); font-size: 13px; line-height: 1.7; }

.advantages { background: var(--soft); }
.advantage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); background: #fff; }
.advantage-grid article { min-height: 220px; padding: 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.advantage-no { color: var(--blue); font-size: 12px; font-weight: 800; }
.advantage-grid h3 { margin: 25px 0 13px; font-size: 19px; }
.advantage-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }

.comparison { background: #0d1930; color: #fff; }
.section-heading.light > p:last-child { color: rgba(255,255,255,.6); }
.comparison-wrap { overflow-x: auto; border: 1px solid rgba(255,255,255,.15); }
.comparison table { width: 100%; min-width: 760px; border-collapse: collapse; text-align: center; }
.comparison th, .comparison td { height: 66px; padding: 12px 18px; border-bottom: 1px solid rgba(255,255,255,.12); border-right: 1px solid rgba(255,255,255,.1); font-size: 14px; }
.comparison thead th { height: 74px; background: rgba(255,255,255,.06); font-size: 15px; }
.comparison tbody th { color: rgba(255,255,255,.7); text-align: left; font-weight: 600; }
.comparison td { color: rgba(255,255,255,.68); }
.comparison .recommended { background: var(--blue); color: #fff; }
.comparison tbody td:last-child { color: #fff; background: rgba(23,105,232,.2); font-weight: 700; }

.plans { background: #fff; }
.region-tabs { display: flex; justify-content: center; gap: 8px; margin: -10px 0 34px; flex-wrap: wrap; }
.region-tabs button { height: 38px; padding: 0 19px; border: 1px solid var(--line); border-radius: 4px; color: #536079; background: #fff; cursor: pointer; }
.region-tabs button.active { color: #fff; border-color: var(--blue); background: var(--blue); }
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); align-items: stretch; gap: 20px; }
.plan-card { position: relative; padding: 34px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.plan-card.popular { border: 2px solid var(--blue); box-shadow: 0 18px 45px rgba(23,105,232,.12); }
.popular-tag { position: absolute; top: 0; right: 0; padding: 6px 14px; color: #fff; background: var(--green); border-radius: 0 4px 0 4px; font-size: 12px; }
.plan-label { margin: 0 0 12px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: 1.5px; }
.plan-card h3 { margin: 0; font-size: 26px; }
.plan-intro { min-height: 54px; margin: 13px 0 23px; color: var(--muted); font-size: 14px; line-height: 1.7; }
.plan-card ul { min-height: 135px; margin: 0 0 26px; padding: 21px 0 0; border-top: 1px solid var(--line); list-style: none; }
.plan-card li { position: relative; margin: 0 0 14px; padding-left: 22px; color: #46536c; font-size: 14px; }
.plan-card li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 800; }

.news { background: var(--soft); }
.news-heading { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 38px; }
.news-heading .section-kicker { color: var(--blue); }
.news-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 42px; }
.news-feature { display: grid; grid-template-columns: 1.05fr .95fr; min-height: 320px; background: #fff; border-radius: 4px; overflow: hidden; }
.news-image-main { background: url("assets/hero-global-network.jpg") center/cover; }
.news-body { padding: 35px 30px; }
.news time { color: #8490a6; font-size: 12px; }
.news h3 { margin: 15px 0; font-size: 21px; line-height: 1.55; }
.news p { color: var(--muted); font-size: 13px; line-height: 1.8; }
.news-list { border-top: 1px solid var(--line); }
.news-list article { position: relative; min-height: 106px; padding: 22px 52px 20px 0; border-bottom: 1px solid var(--line); }
.news-list h3 { margin: 8px 0 0; font-size: 16px; }
.news-list a { position: absolute; right: 5px; top: 40px; color: var(--blue); font-size: 23px; }

.contact-band { padding: 62px 0; color: #fff; background: var(--blue-deep); }
.contact-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.contact-inner .section-kicker { color: #63c6e9; }
.contact-inner p:last-child { margin: 13px 0 0; color: rgba(255,255,255,.7); font-size: 14px; }

.site-footer { color: rgba(255,255,255,.72); background: #081326; }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: 55px; padding-top: 68px; padding-bottom: 58px; }
.brand-light .brand-copy strong { color: #fff; }
.brand-light .brand-copy small { color: rgba(255,255,255,.46); }
.footer-brand > p { max-width: 340px; margin: 24px 0 0; font-size: 13px; line-height: 1.9; }
.footer-grid h3 { margin: 0 0 22px; color: #fff; font-size: 15px; }
.footer-grid > div:not(.footer-brand) a, .footer-grid > div:not(.footer-brand) p { display: block; margin: 0 0 13px; font-size: 13px; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.09); }
.footer-bottom > div { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: 12px; }

@media (max-width: 980px) {
  .site-header { height: 64px; }
  .nav-shell { width: min(100% - 28px, var(--shell)); }
  .menu-toggle { display: block; margin-left: auto; }
  .nav-cta { display: none; }
  .main-nav { position: absolute; top: 64px; left: 0; right: 0; height: auto; padding: 12px 20px 20px; display: none; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 16px 25px rgba(18,37,69,.1); }
  .main-nav.open { display: flex; }
  .main-nav a { height: 48px; display: flex; align-items: center; border-bottom: 1px solid #edf1f6; }
  .main-nav a::after { display: none; }
  .hero { height: min(650px, calc(100svh - 92px)); min-height: 520px; }
  .hero h1, .hero h2 { font-size: 42px; }
  .product-grid, .advantage-grid, .plan-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid .product-card:last-child, .plan-grid .plan-card:last-child { grid-column: 1 / -1; }
  .scene-band { grid-template-columns: 1fr; }
  .scene-image { min-height: 390px; }
  .scene-copy { padding: 60px max(28px, calc((100vw - var(--shell)) / 2)); }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-grid > div:last-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .nav-shell, .section-shell, .hero-inner { width: calc(100% - 32px); }
  .brand { min-width: 0; }
  .brand-mark { width: 38px; height: 38px; }
  .brand-copy strong { font-size: 17px; }
  .brand-copy small { font-size: 8px; }
  .hero { height: 72svh; min-height: 510px; max-height: 610px; }
  .hero-slide { background-image: linear-gradient(90deg, rgba(3,17,43,.88), rgba(3,22,55,.45)), var(--hero-image); background-position: 62% center; }
  .hero-inner { justify-content: flex-end; padding-bottom: 82px; }
  .eyebrow { margin-bottom: 12px; font-size: 10px; }
  .hero h1, .hero h2 { font-size: 34px; line-height: 1.25; }
  .hero-lead { margin-top: 17px; font-size: 15px; line-height: 1.7; }
  .hero-actions { margin-top: 24px; }
  .button { min-width: 116px; height: 44px; padding: 0 18px; }
  .hero-dots { bottom: 28px; }
  .section { padding: 68px 0; }
  .section-heading { margin-bottom: 32px; text-align: left; }
  .section-heading h2, .news-heading h2, .scene-copy h2, .contact-inner h2 { font-size: 28px; }
  .product-grid, .advantage-grid, .plan-grid { grid-template-columns: 1fr; }
  .product-grid .product-card:last-child, .plan-grid .plan-card:last-child { grid-column: auto; }
  .product-card { min-height: 290px; padding: 30px 26px; }
  .product-card p { min-height: 0; }
  .scene-image { min-height: 280px; }
  .scene-copy { padding: 50px 24px; }
  .scene-copy h2 { font-size: 29px; }
  .advantage-grid article { min-height: 185px; padding: 27px; }
  .advantage-grid h3 { margin-top: 18px; }
  .region-tabs { justify-content: flex-start; flex-wrap: nowrap; overflow-x: auto; padding-bottom: 5px; }
  .region-tabs button { flex: 0 0 auto; }
  .news-heading { align-items: flex-end; }
  .news-feature { grid-template-columns: 1fr; }
  .news-image-main { min-height: 220px; }
  .news-body { padding: 28px 24px; }
  .contact-inner { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 38px 26px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-grid > div:last-child { grid-column: 1 / -1; }
  .footer-bottom > div { padding: 15px 0; align-items: flex-start; flex-direction: column; justify-content: center; gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}