:root {
  --ink: #0b2534;
  --ink-soft: #173d4a;
  --teal: #0f766e;
  --teal-light: #dcefed;
  --sky: #38bdf8;
  --coral: #f97316;
  --paper: #f7faf9;
  --white: #ffffff;
  --line: #dce5e7;
  --muted: #5b6f78;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  letter-spacing: 0;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; letter-spacing: 0; }
.container { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.prototype-bar { background: var(--ink); color: #dbe9ec; font-size: 12px; }
.prototype-bar .container { min-height: 30px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.prototype-bar a { color: #7dd3fc; text-decoration: none; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(247,250,249,.97); border-bottom: 1px solid var(--line); }
.header-inner { height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 0; text-decoration: none; font-weight: 850; }
.brand-mark { width: 36px; height: 36px; flex: 0 0 36px; display: grid; place-items: center; background: var(--teal); color: var(--white); border-radius: 4px; font-size: 15px; }
.brand-name { line-height: 1.25; font-size: 15px; }
.site-nav { display: flex; align-items: center; gap: 7px; }
.site-nav a { padding: 10px 12px; border-radius: 4px; color: #38515b; font-size: 14px; font-weight: 700; text-decoration: none; }
.site-nav a:hover, .site-nav a.is-active { background: var(--teal-light); color: var(--teal); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn, .lang-btn { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 4px; background: var(--white); color: var(--ink); cursor: pointer; font-size: 13px; font-weight: 850; }
.icon-btn { display: none; }
.icon-btn svg { width: 19px; }
.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 18px; border: 1px solid transparent; border-radius: 4px; font-weight: 800; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--coral); color: #21170f; }
.button-secondary { border-color: rgba(255,255,255,.6); color: var(--white); background: rgba(11,37,52,.32); }
.button-dark { background: var(--ink); color: var(--white); }
.hero { position: relative; min-height: 540px; height: min(64svh, 620px); display: flex; align-items: center; overflow: hidden; background: var(--ink) url('../assets/circuit-board.jpg') center/cover no-repeat; color: var(--white); }
.hero::before { content: ""; position: absolute; inset: 0; background: rgba(5,24,34,.74); }
.hero::after { content: ""; position: absolute; left: 0; bottom: 0; width: 34%; height: 7px; background: var(--coral); }
.hero-inner { position: relative; z-index: 1; max-width: 810px; padding-block: 72px; }
.eyebrow { margin: 0 0 14px; color: var(--teal); font-size: 12px; font-weight: 900; text-transform: uppercase; }
.hero .eyebrow, .page-hero .eyebrow { color: #7dd3fc; }
.hero h1 { max-width: 800px; margin: 0; font-size: 58px; line-height: 1.08; font-weight: 850; }
.hero-copy { max-width: 720px; margin: 22px 0 0; color: #d9e8eb; font-size: 18px; line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 24px; margin-top: 48px; color: #b9ccd1; font-size: 13px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta svg { width: 17px; color: #7dd3fc; }
.section { padding: 88px 0; }
.hero + .section { padding-top: 34px; }
.section-white { background: var(--white); }
.section-dark { background: var(--ink); color: var(--white); }
.section-head { display: grid; grid-template-columns: minmax(0,.9fr) minmax(0,1.1fr); gap: 60px; align-items: end; margin-bottom: 40px; }
.section-head h2, .split-copy h2, .cta h2 { margin: 0; font-size: 38px; line-height: 1.18; }
.section-head p, .split-copy > p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.8; }
.service-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
.service-card { min-height: 250px; padding: 26px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); }
.service-card .icon-wrap { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 36px; border-radius: 4px; background: var(--teal-light); color: var(--teal); }
.service-card svg { width: 21px; }
.service-card h3 { margin: 0 0 10px; font-size: 20px; }
.service-card p { margin: 0; color: var(--muted); line-height: 1.7; }
.section-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 26px; color: var(--teal); font-weight: 850; text-decoration: none; }
.section-link svg { width: 18px; }
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.split-media { aspect-ratio: 4/3; overflow: hidden; border-radius: 6px; }
.split-media img { width: 100%; height: 100%; object-fit: cover; }
.values { display: grid; gap: 0; margin-top: 32px; border-top: 1px solid var(--line); }
.value { display: grid; grid-template-columns: 42px 1fr; gap: 14px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.value-number { color: var(--coral); font-size: 13px; font-weight: 900; }
.value h3 { margin: 0 0 5px; font-size: 17px; }
.value p { margin: 0; color: var(--muted); line-height: 1.6; }
.cta-band { padding: 38px 0; background: var(--teal); color: var(--white); }
.cta { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta h2 { font-size: 30px; }
.cta p { max-width: 570px; margin: 8px 0 0; color: #d8f1ee; line-height: 1.7; }
.page-hero { position: relative; min-height: 430px; display: flex; align-items: end; overflow: hidden; background-color: var(--ink); background-position: center; background-size: cover; color: var(--white); }
.page-hero::before { content: ""; position: absolute; inset: 0; background: rgba(5,24,34,.72); }
.page-hero .container { position: relative; z-index: 1; padding-block: 74px; }
.page-hero h1 { max-width: 850px; margin: 0; font-size: 48px; line-height: 1.12; }
.page-hero p:last-child { max-width: 750px; margin: 18px 0 0; color: #d9e8eb; font-size: 17px; line-height: 1.75; }
.hero-about { background-image: url('assets/team-collaboration.jpg'); }
.hero-services { background-image: url('assets/data-center.jpg'); }
.hero-contact { background-image: url('assets/circuit-board.jpg'); }
.statement { padding: 74px 0; background: var(--teal-light); }
.statement-inner { display: grid; grid-template-columns: .55fr 1.45fr; gap: 50px; }
.statement h2 { margin: 0; font-size: 23px; }
.statement blockquote { margin: 0; color: var(--ink-soft); font-size: 30px; line-height: 1.45; font-weight: 750; }
.principle-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 28px; }
.principle { padding-top: 22px; border-top: 3px solid var(--coral); }
.principle h3 { margin: 0 0 9px; font-size: 22px; }
.principle p { margin: 0; color: var(--muted); line-height: 1.75; }
.services-all { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; }
.services-all .service-card { min-height: 230px; }
.process { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-top: 1px solid #41606b; }
.process-step { padding: 28px 24px 10px 0; }
.process-step strong { display: block; margin-bottom: 32px; color: #7dd3fc; font-size: 13px; }
.process-step h3 { margin: 0 0 10px; font-size: 18px; }
.process-step p { margin: 0; color: #b8cbd0; line-height: 1.7; }
.contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 68px; align-items: start; }
.contact-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.contact-row { padding: 19px 0; border-bottom: 1px solid var(--line); }
.contact-row strong { display: block; margin-bottom: 6px; color: var(--teal); font-size: 12px; text-transform: uppercase; }
.contact-row span, .contact-row a { color: var(--ink-soft); line-height: 1.6; text-decoration: none; }
.contact-form { padding: 30px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: grid; gap: 7px; }
.field-full { grid-column: 1/-1; }
.field label { font-size: 13px; font-weight: 800; }
.field input, .field textarea { width: 100%; border: 1px solid #cdd9dc; border-radius: 4px; background: var(--paper); padding: 12px 13px; color: var(--ink); outline: none; }
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(15,118,110,.12); }
.form-footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: 18px; }
.toast { padding: 9px 12px; border-left: 3px solid var(--coral); background: #fff4e8; color: #7c3f0d; font-size: 13px; }
.site-footer { padding: 56px 0 24px; background: #071c27; color: #c6d6da; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .7fr .7fr; gap: 54px; padding-bottom: 40px; }
.site-footer .brand { color: var(--white); }
.footer-scope { max-width: 480px; margin: 18px 0 0; color: #91aab1; line-height: 1.7; }
.footer-col h3 { margin: 0 0 14px; color: #7dd3fc; font-size: 12px; text-transform: uppercase; }
.footer-col a { display: block; margin: 9px 0; color: #c6d6da; text-decoration: none; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 20px; border-top: 1px solid #294450; color: #839ca3; font-size: 12px; }
.icp-link { color: #9fc6ce; text-decoration: none; }
.icp-link:hover, .icp-link:focus-visible { color: #d5f3f7; text-decoration: underline; }

@media (max-width: 900px) {
  .site-nav { position: absolute; top: 74px; left: 0; right: 0; display: none; padding: 12px 20px 20px; border-bottom: 1px solid var(--line); background: var(--paper); }
  .site-nav.is-open { display: grid; }
  .icon-btn { display: grid; }
  .header-actions .button { display: none; }
  .hero h1 { font-size: 46px; }
  .section-head, .split, .statement-inner, .contact-layout { grid-template-columns: 1fr; gap: 34px; }
  .service-grid, .principle-grid { grid-template-columns: 1fr 1fr; }
  .process { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 30px), var(--max)); }
  .prototype-bar .container { min-height: 38px; }
  .prototype-bar span { display: none; }
  .header-inner { gap: 8px; }
  .header-actions { gap: 4px; }
  .brand-name { max-width: 132px; font-size: 12px; }
  .hero { min-height: 570px; height: 68svh; }
  .hero h1 { font-size: 38px; }
  .hero-copy { font-size: 16px; }
  .hero-meta { gap: 12px; margin-top: 32px; }
  .section { padding: 64px 0; }
  .section-head h2, .split-copy h2 { font-size: 31px; }
  .section-head, .service-grid, .principle-grid, .services-all, .process, .footer-grid, .form-grid { grid-template-columns: 1fr; }
  .service-card { min-height: auto; }
  .service-card .icon-wrap { margin-bottom: 24px; }
  .page-hero { min-height: 380px; }
  .page-hero h1 { font-size: 36px; }
  .statement blockquote { font-size: 24px; }
  .cta, .footer-bottom, .form-footer { align-items: flex-start; flex-direction: column; }
  .cta h2 { font-size: 26px; }
}