:root {
  --navy: #071b42;
  --navy-2: #0a265c;
  --blue: #0e6dfd;
  --blue-2: #0057e7;
  --teal: #0aa68f;
  --ink: #10264c;
  --muted: #66758d;
  --line: #d9e3f0;
  --soft: #f4f8fe;
  --white: #fff;
  --shadow: 0 18px 55px rgba(7, 27, 66, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--navy);
  background: var(--white);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
.container { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.narrow { max-width: 820px; text-align: center; }
.section { padding: 96px 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; z-index: 100; left: 16px; top: -80px;
  padding: 10px 16px; color: #fff; background: var(--navy);
}
.skip-link:focus { top: 12px; }
.eyebrow {
  margin: 0 0 18px; color: var(--blue); font-size: 15px; font-weight: 700;
  letter-spacing: .12em;
}

.site-header {
  position: sticky; z-index: 50; top: 0;
  height: 76px; border-bottom: 1px solid rgba(7, 27, 66, .08);
  background: rgba(255, 255, 255, .94); backdrop-filter: blur(14px);
}
.header-inner { height: 100%; display: flex; align-items: center; gap: 34px; }
.brand { display: inline-flex; align-items: center; gap: 11px; margin-right: auto; }
.brand-mark {
  display: grid; place-items: center; width: 36px; height: 36px;
  color: #fff; background: var(--blue); border-radius: 8px; font-weight: 800;
}
.brand strong { display: block; font-size: 20px; line-height: 1.05; letter-spacing: -.03em; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font-size: 11px; }
.site-nav { display: flex; align-items: center; gap: 30px; }
.site-nav a { color: #425574; font-size: 14px; font-weight: 600; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--blue); }
.header-cta {
  padding: 10px 19px; border: 1px solid var(--blue); border-radius: 7px;
  color: var(--blue); font-size: 14px; font-weight: 700;
}
.header-cta:hover, .header-cta:focus-visible { color: #fff; background: var(--blue); }
.menu-toggle { display: none; border: 0; background: transparent; }

.hero {
  overflow: hidden; min-height: 760px; padding: 94px 0 84px;
  background:
    radial-gradient(circle at 77% 42%, rgba(14, 109, 253, .08), transparent 24%),
    linear-gradient(180deg, #fff, #fbfdff);
}
.hero-grid {
  display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: 70px;
}
.hero h1 {
  margin: 0; max-width: 650px; font-size: clamp(46px, 5vw, 72px);
  line-height: 1.1; letter-spacing: -.055em;
}
.hero-lead { max-width: 580px; margin: 28px 0 32px; color: var(--muted); font-size: 19px; }
.domain-form label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 700; }
.domain-row { display: grid; grid-template-columns: 1fr 142px; max-width: 620px; }
.domain-row input {
  min-width: 0; height: 58px; padding: 0 18px;
  border: 1px solid #cbd7e6; border-right: 0; border-radius: 7px 0 0 7px;
  outline: none; color: var(--navy); background: #fff;
}
.domain-row input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(14, 109, 253, .12); }
.domain-row button {
  border: 0; border-radius: 0 7px 7px 0; color: #fff;
  background: linear-gradient(135deg, #1778ff, #075ee8); font-weight: 800;
  box-shadow: 0 12px 25px rgba(14, 109, 253, .25);
}
.domain-row button:hover, .domain-row button:focus-visible { filter: brightness(.95); }
.form-message { min-height: 28px; margin: 8px 0 0; font-size: 14px; font-weight: 600; }
.form-message.is-error { color: #b42318; }
.form-message.is-success { color: #087f6c; }
.feature-ticks {
  display: flex; flex-wrap: wrap; gap: 10px 26px; padding: 0; margin: 21px 0 0; list-style: none;
  color: #40516c; font-size: 14px;
}
.feature-ticks li::before {
  content: "✓"; display: inline-grid; place-items: center; width: 20px; height: 20px;
  margin-right: 7px; border: 1px solid var(--blue); border-radius: 50%;
  color: var(--blue); font-size: 12px;
}
.form-note { margin: 21px 0 0; color: #8a96a8; font-size: 12px; }

.diagnostic-visual {
  position: relative; isolation: isolate; width: 100%; aspect-ratio: 1; max-width: 570px; margin-inline: auto;
  background: radial-gradient(circle at center, rgba(14, 109, 253, .11) 0 9%, rgba(14, 109, 253, .025) 24%, transparent 56%);
}
.orbit, .axis { position: absolute; pointer-events: none; }
.orbit {
  z-index: 0; top: 50%; left: 50%; border: 1px solid rgba(7, 27, 66, .46);
  border-radius: 50%; transform: translate(-50%, -50%);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .72) inset;
}
.orbit-outer { width: 94%; height: 94%; }
.orbit-middle { width: 66%; height: 66%; }
.orbit-inner { width: 36%; height: 36%; }
.axis-x { z-index: 0; left: 2%; right: 2%; top: 50%; border-top: 1px dashed #b9cce4; }
.axis-y { z-index: 0; top: 2%; bottom: 2%; left: 50%; border-left: 1px dashed #b9cce4; }
.shield {
  position: absolute; z-index: 2; left: 50%; top: 50%; display: grid; place-items: center;
  width: 108px; height: 128px; transform: translate(-50%, -50%);
  color: #fff; background: linear-gradient(160deg, #3190ff, #0056e7);
  clip-path: polygon(50% 0, 92% 15%, 85% 72%, 50% 100%, 15% 72%, 8% 15%);
  filter: drop-shadow(0 18px 22px rgba(14, 109, 253, .32));
}
.shield span { font-size: 38px; font-weight: 800; }
.metric-card {
  position: absolute; z-index: 3; width: 164px; min-height: 108px;
  padding: 17px; border: 1px solid rgba(7, 27, 66, .08); border-radius: 11px;
  background: rgba(255, 255, 255, .91); box-shadow: var(--shadow); backdrop-filter: blur(8px);
}
.metric-card small, .metric-card span { display: block; }
.metric-card small { margin-bottom: 9px; color: var(--navy); font-weight: 800; }
.metric-card strong { color: var(--teal); font-size: 18px; }
.metric-card span { margin-top: 8px; color: #8290a5; font-size: 11px; }
.metric-access { left: 0; top: 31%; }
.metric-speed { right: 0; top: 10%; }
.metric-security { left: 5%; bottom: 8%; }
.metric-seo { right: 3%; bottom: 5%; }

.intro-section { padding-bottom: 60px; }
.intro-section h2, .section-heading h2, .about-section h2, .contact-section h2 {
  margin: 0; font-size: clamp(34px, 4vw, 50px); line-height: 1.22; letter-spacing: -.04em;
}
.intro-section .narrow > p:last-child { margin: 24px 0 0; color: var(--muted); font-size: 17px; }
.check-section { padding-top: 0; }
.check-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.check-card { min-height: 220px; padding: 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.check-card span { color: var(--blue); font-weight: 800; }
.check-card h3 { margin: 38px 0 11px; font-size: 20px; }
.check-card p { margin: 0; color: var(--muted); font-size: 14px; }

.service-section { padding: 100px 0; color: #fff; background: var(--navy); }
.section-heading { display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 80px; margin-bottom: 58px; }
.section-heading > p { margin: 0; color: #aab8ce; }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid rgba(255,255,255,.16); border-left: 1px solid rgba(255,255,255,.16); }
.service-card {
  min-height: 245px; padding: 32px; border-right: 1px solid rgba(255,255,255,.16);
  border-bottom: 1px solid rgba(255,255,255,.16); transition: .25s ease;
}
.service-card:hover { background: rgba(255,255,255,.06); transform: translateY(-3px); }
.service-card > span { color: #52a4ff; font-size: 28px; }
.service-card h3 { margin: 42px 0 12px; font-size: 21px; }
.service-card p { margin: 0; color: #aab8ce; font-size: 14px; }

.about-section { padding-block: 110px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 100px; }
.about-copy { padding-top: 44px; }
.about-copy p { margin: 0 0 22px; color: var(--muted); font-size: 17px; }
.contact-section { padding: 82px 0; color: #fff; background: linear-gradient(120deg, #0b326f, #085fd6); }
.contact-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 80px; }
.eyebrow.light { color: #a9cffd; }
.contact-inner p:last-child { max-width: 680px; margin: 22px 0 0; color: #c9d9ee; }
.contact-link {
  min-width: 220px; padding: 17px 24px; border-radius: 7px; color: var(--navy);
  background: #fff; text-align: center; font-weight: 800;
}
.contact-link span { margin-left: 16px; color: var(--blue); }

.site-footer { padding: 70px 0 24px; color: #fff; background: #04132f; }
.footer-grid { display: flex; justify-content: space-between; gap: 50px; padding-bottom: 48px; }
.footer-brand { font-size: 25px; font-weight: 900; }
.footer-brand span { margin-left: 8px; color: #9dacc2; font-size: 13px; font-weight: 500; }
.footer-grid p { color: #9dacc2; }
.footer-grid nav { display: flex; gap: 28px; color: #bec9d9; font-size: 14px; }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 30px; padding-top: 22px;
  border-top: 1px solid rgba(255,255,255,.13); color: #8796ad; font-size: 13px;
}
.footer-bottom a:hover, .footer-bottom a:focus-visible { color: #fff; }

@media (max-width: 900px) {
  .container { width: min(100% - 32px, 720px); }
  .site-header { height: 68px; }
  .site-nav, .header-cta { display: none; }
  .menu-toggle {
    display: grid; gap: 5px; width: 42px; height: 42px; padding: 10px;
    place-content: center; border: 1px solid var(--line); border-radius: 7px;
  }
  .menu-toggle span:not(.sr-only) { display: block; width: 20px; height: 2px; background: var(--navy); }
  .site-nav.is-open {
    position: absolute; top: 68px; left: 0; right: 0; display: grid; gap: 0;
    padding: 8px 16px 16px; border-bottom: 1px solid var(--line);
    background: #fff; box-shadow: 0 16px 30px rgba(7,27,66,.08);
  }
  .site-nav.is-open a { padding: 12px 8px; }
  .hero { min-height: auto; padding: 68px 0 54px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { font-size: clamp(40px, 12vw, 58px); }
  .diagnostic-visual { width: min(100%, 560px); }
  .check-grid, .service-grid { grid-template-columns: repeat(2, 1fr); }
  .section-heading, .about-grid { grid-template-columns: 1fr; gap: 30px; }
  .about-copy { padding-top: 0; }
  .contact-inner { grid-template-columns: 1fr; gap: 38px; }
  .contact-link { justify-self: start; }
}

@media (max-width: 560px) {
  .section { padding: 72px 0; }
  .brand small { display: none; }
  .hero { padding-top: 54px; }
  .hero h1 { font-size: 43px; }
  .hero-lead { margin: 22px 0 26px; font-size: 16px; }
  .domain-row { grid-template-columns: 1fr; gap: 10px; }
  .domain-row input { border-right: 1px solid #cbd7e6; border-radius: 7px; }
  .domain-row button { height: 56px; border-radius: 7px; }
  .feature-ticks { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 5px; }
  .diagnostic-visual { width: calc(100% + 12px); margin-left: -6px; }
  .metric-card { width: 132px; min-height: 102px; padding: 13px; }
  .metric-card small { font-size: 11px; }
  .metric-card strong { font-size: 15px; }
  .metric-speed { right: 0; top: 8%; }
  .metric-access { left: 0; top: 29%; }
  .metric-security { left: 1%; bottom: 5%; }
  .metric-seo { right: 0; bottom: 3%; }
  .shield { width: 82px; height: 98px; }
  .intro-section { padding-bottom: 44px; }
  .intro-section h2, .section-heading h2, .about-section h2, .contact-section h2 { font-size: 34px; }
  .check-grid, .service-grid { grid-template-columns: 1fr; }
  .check-card { min-height: 180px; padding: 28px; }
  .check-card h3 { margin-top: 26px; }
  .service-section { padding: 76px 0; }
  .service-card { min-height: 205px; padding: 28px; }
  .service-card h3 { margin-top: 28px; }
  .about-section { padding-block: 78px; }
  .contact-section { padding: 68px 0; }
  .contact-link { width: 100%; }
  .footer-grid, .footer-bottom { display: grid; }
  .footer-grid nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px; }
}

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