:root {
  --ink: #10212a;
  --muted: #5f6c72;
  --paper: #f4f6f4;
  --white: #ffffff;
  --night: #071920;
  --night-soft: #0d2b34;
  --accent: #5fd1b2;
  --accent-dark: #137c68;
  --line: #d9e0dd;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.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: 1000;
  top: 12px;
  left: 12px;
  padding: 8px 14px;
  background: var(--white);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: absolute;
  z-index: 50;
  width: 100%;
  color: var(--white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}
.header-inner { height: 84px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 13px; }
.brand > span:last-child { display: flex; flex-direction: column; }
.brand strong { font-size: 19px; line-height: 1.15; letter-spacing: 0; }
.brand small { margin-top: 5px; font-size: 8px; line-height: 1; letter-spacing: 0.14em; opacity: 0.65; }
.brand-mark { position: relative; width: 34px; height: 34px; display: block; }
.brand-mark i { position: absolute; width: 12px; height: 12px; border: 2px solid var(--accent); transform: rotate(45deg); }
.brand-mark i:nth-child(1) { top: 1px; left: 1px; }
.brand-mark i:nth-child(2) { top: 1px; right: 1px; }
.brand-mark i:nth-child(3) { bottom: 1px; left: 11px; background: var(--accent); }
.site-nav { display: flex; align-items: center; gap: 38px; font-size: 14px; }
.site-nav a { position: relative; color: rgba(255, 255, 255, 0.82); transition: color 180ms ease; }
.site-nav a:not(.nav-contact)::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 180ms ease;
}
.site-nav a:hover { color: var(--white); }
.site-nav a:hover::after { transform: scaleX(1); }
.nav-contact { padding: 10px 19px; border: 1px solid rgba(255, 255, 255, 0.52); }
.menu-button { display: none; border: 0; background: none; color: inherit; }

.hero { position: relative; min-height: 720px; height: 88vh; max-height: 900px; display: flex; align-items: center; color: var(--white); overflow: hidden; }
.hero-media, .hero-shade { position: absolute; inset: 0; }
.hero-media {
  background-image: url("assets/hero-server-room.jpg");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}
.hero-shade { background: linear-gradient(90deg, rgba(4, 20, 27, 0.94) 0%, rgba(5, 24, 31, 0.77) 44%, rgba(5, 25, 32, 0.22) 78%); }
.hero-content { position: relative; padding-top: 76px; }
.eyebrow { margin: 0 0 22px; color: var(--accent); font-size: 12px; font-weight: 600; letter-spacing: 0.16em; }
.eyebrow.dark { color: var(--accent-dark); }
.hero h1 { max-width: 800px; margin: 0; font-size: 68px; line-height: 1.2; font-weight: 600; letter-spacing: 0; }
.hero-copy { max-width: 610px; margin: 28px 0 0; color: rgba(255, 255, 255, 0.72); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 34px; margin-top: 38px; }
.button { display: inline-flex; min-height: 50px; padding: 0 28px; align-items: center; justify-content: center; font-size: 14px; font-weight: 600; }
.button-primary { background: var(--accent); color: #06231d; transition: background 180ms ease, transform 180ms ease; }
.button-primary:hover { background: #79dfc4; transform: translateY(-2px); }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 500; }
.text-link span { transition: transform 180ms ease; }
.text-link:hover span { transform: translateX(5px); }
.scroll-cue { position: absolute; right: max(24px, calc((100vw - var(--container)) / 2)); bottom: 40px; width: 22px; height: 38px; border: 1px solid rgba(255, 255, 255, 0.42); border-radius: 12px; }
.scroll-cue span { position: absolute; top: 8px; left: 9px; width: 2px; height: 7px; background: var(--white); animation: scroll 1.8s infinite; }
@keyframes scroll { 0% { transform: translateY(0); opacity: 0; } 35% { opacity: 1; } 100% { transform: translateY(13px); opacity: 0; } }

.section { padding: 112px 0; }
.section-heading { display: grid; grid-template-columns: minmax(0, 1fr) 420px; gap: 80px; align-items: end; margin-bottom: 58px; }
.section-heading h2, .about h2, .contact h2 { margin: 0; font-size: 44px; line-height: 1.35; font-weight: 600; letter-spacing: 0; }
.section-heading > p { margin: 0 0 4px; color: var(--muted); font-size: 16px; }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.service-item { padding: 42px 42px 46px 0; }
.service-item + .service-item { padding-left: 42px; border-left: 1px solid var(--line); }
.service-number { color: var(--accent-dark); font-size: 12px; font-weight: 600; }
.service-item h3 { margin: 24px 0 16px; font-size: 25px; font-weight: 600; }
.service-item > p { min-height: 82px; margin: 0; color: var(--muted); }
.service-item ul { display: flex; flex-wrap: wrap; gap: 8px; margin: 30px 0 0; padding: 0; list-style: none; }
.service-item li { padding: 5px 10px; border: 1px solid var(--line); color: #486058; font-size: 12px; }

.about { background: var(--white); }
.about-layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(380px, 0.85fr); gap: 110px; }
.about-copy > p:not(.eyebrow) { max-width: 650px; margin: 30px 0; color: var(--muted); font-size: 16px; }
.dark-link { color: var(--accent-dark); }
.principles { border-top: 1px solid var(--line); }
.principles > div { display: grid; grid-template-columns: 100px 1fr; gap: 18px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.principles strong { font-size: 20px; font-weight: 600; }
.principles p { margin: 0; color: var(--muted); font-size: 14px; }

.approach { background: #e9eeeb; }
.section-heading.compact { margin-bottom: 46px; }
.process-list { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; list-style: none; border-top: 1px solid #cbd6d1; }
.process-list li { position: relative; padding: 30px 28px 0 0; }
.process-list li:not(:last-child)::after { content: ""; position: absolute; top: -4px; right: 28px; width: 8px; height: 8px; background: var(--accent-dark); border-radius: 50%; }
.process-list span { display: block; margin-bottom: 18px; color: var(--accent-dark); font-size: 11px; font-weight: 600; }
.process-list strong { display: block; font-size: 18px; }
.process-list p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }

.contact { padding: 92px 0; color: var(--white); background: var(--night-soft); }
.contact-layout { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(360px, 0.8fr); gap: 100px; align-items: end; }
.contact h2 { max-width: 610px; }
.contact h2 + p { max-width: 610px; margin: 24px 0 0; color: rgba(255, 255, 255, 0.63); }
.contact-details { display: grid; gap: 18px; }
.contact-details > div { display: grid; grid-template-columns: 92px 1fr; gap: 18px; padding: 17px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.15); }
.contact-details span { color: rgba(255, 255, 255, 0.5); font-size: 13px; }
.contact-details a, .contact-details strong { font-size: 14px; font-weight: 500; overflow-wrap: anywhere; }
.contact-details a:hover { color: var(--accent); }

.site-footer { color: rgba(255, 255, 255, 0.65); background: var(--night); }
.footer-main { display: grid; grid-template-columns: 1.2fr 1fr auto; gap: 50px; padding-top: 54px; padding-bottom: 48px; align-items: start; }
.footer-brand { color: var(--white); }
.footer-main p { margin: 0; font-size: 13px; }
.footer-main nav { display: flex; gap: 28px; font-size: 13px; }
.footer-main a:hover { color: var(--white); }
.footer-bottom { display: flex; justify-content: space-between; gap: 28px; padding-top: 20px; padding-bottom: 22px; border-top: 1px solid rgba(255, 255, 255, 0.1); font-size: 11px; }
.footer-bottom p { margin: 0; }
.filing-links { display: flex; gap: 20px; }
.filing-links a:hover { color: var(--white); }

@media (max-width: 900px) {
  .site-nav { gap: 22px; }
  .section-heading, .about-layout, .contact-layout { grid-template-columns: 1fr; gap: 28px; }
  .service-item { padding-right: 24px; }
  .service-item + .service-item { padding-left: 24px; }
  .service-item > p { min-height: 108px; }
  .about-layout { gap: 52px; }
  .process-list { grid-template-columns: repeat(2, 1fr); row-gap: 34px; }
  .process-list li:nth-child(2)::after { display: none; }
  .contact-layout { gap: 52px; }
  .hero h1 { font-size: 54px; }
  .section-heading h2, .about h2, .contact h2 { font-size: 38px; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 36px), var(--container)); }
  .header-inner { height: 70px; }
  .brand strong { font-size: 17px; }
  .menu-button { z-index: 2; width: 42px; height: 42px; padding: 10px; display: grid; align-content: center; justify-content: center; gap: 5px; border: 1px solid rgba(255, 255, 255, 0.34); }
  .menu-button span:not(.sr-only) { display: block; width: 22px; height: 1px; background: currentColor; transition: transform 180ms ease, opacity 180ms ease; }
  .menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .site-nav { position: fixed; inset: 0; padding: 110px 28px 40px; display: flex; flex-direction: column; align-items: flex-start; gap: 28px; color: var(--white); background: var(--night); transform: translateX(100%); transition: transform 220ms ease; }
  .site-nav.open { transform: translateX(0); }
  .site-nav a { font-size: 22px; }
  .nav-contact { margin-top: 10px; font-size: 15px !important; }
  .hero { min-height: 650px; height: 88svh; max-height: 780px; }
  .hero-media { background-position: 58% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(4, 20, 27, 0.94), rgba(5, 24, 31, 0.62)); }
  .hero-content { padding-top: 68px; }
  .hero h1 { font-size: 42px; line-height: 1.25; }
  .hero-tagline { display: block; margin-top: 2px; font-size: 35px; line-height: 1.35; white-space: nowrap; }
  .hero-copy { margin-top: 22px; font-size: 15px; line-height: 1.8; }
  .hero-actions { margin-top: 30px; gap: 25px; }
  .scroll-cue { right: 18px; bottom: 28px; }
  .section { padding: 78px 0; }
  .section-heading { margin-bottom: 38px; }
  .section-heading h2, .about h2, .contact h2 { font-size: 30px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-item { padding: 32px 0; }
  .service-item + .service-item { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
  .service-item > p { min-height: auto; }
  .about-layout { grid-template-columns: 1fr; }
  .principles > div { grid-template-columns: 72px 1fr; }
  .process-list { grid-template-columns: 1fr; row-gap: 26px; }
  .process-list li { padding-top: 24px; border-bottom: 1px solid #cbd6d1; padding-bottom: 26px; }
  .process-list li::after { display: none; }
  .contact { padding: 72px 0; }
  .contact-details > div { grid-template-columns: 80px 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 28px; }
  .footer-main nav { flex-wrap: wrap; }
  .footer-bottom, .filing-links { flex-direction: column; gap: 10px; }
}

@media (max-width: 370px) {
  .hero h1 { font-size: 38px; }
  .hero-tagline { font-size: 32px; }
  .hero-actions { gap: 18px; }
  .button { padding-inline: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}