:root {
  color-scheme: light;
  --blue: #3b63ff;
  --purple: #5b5cff;
  --cyan: #25d0df;
  --ink: #111827;
  --muted: #6b7280;
  --soft: #f4f7ff;
  --line: #e6ebf5;
  --shadow: 0 18px 50px rgba(49, 86, 255, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; }

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: 78px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 0 max(32px, calc((100vw - 1120px) / 2));
  background: rgba(255,255,255,.86);
  border-bottom: 1px solid rgba(230,235,245,.8);
  backdrop-filter: blur(18px);
}
.site-header.is-scrolled { box-shadow: 0 12px 40px rgba(17,24,39,.08); }
.brand { display:flex; align-items:center; gap:10px; font-size:20px; font-weight:900; }
.brand img, .footer-brand img { width:44px; height:44px; object-fit:contain; }
.brand small { display:block; margin-top:-5px; color:#111827; font-size:10px; letter-spacing:.36em; font-weight:800; }
.site-nav { display:flex; justify-content:center; align-items:center; gap:30px; font-size:15px; font-weight:760; }
.site-nav a { position:relative; padding:28px 0; color:#111827; }
.site-nav a.active, .site-nav a:hover { color:var(--blue); }
.site-nav a.active::after, .site-nav a:hover::after {
  position:absolute; left:0; right:0; bottom:0; height:3px; content:""; background:var(--blue); border-radius:99px;
}
.nav-cta {
  display:inline-flex; align-items:center; justify-content:center; height:38px; padding:0 24px;
  color:#fff; background:linear-gradient(135deg,var(--blue),var(--purple)); border-radius:999px; font-weight:800;
}
.menu-button { display:none; width:42px; height:38px; padding:9px; background:transparent; border:0; }
.menu-button span:not(.sr-only) { display:block; height:2px; margin:4px 0; background:currentColor; border-radius:2px; }

.hero {
  min-height: 570px;
  display:grid;
  grid-template-columns: 1fr 1.05fr;
  align-items:center;
  gap:56px;
  padding: 118px max(32px, calc((100vw - 1120px) / 2)) 54px;
  background:
    radial-gradient(circle at 72% 30%, rgba(59,99,255,.16), transparent 28%),
    linear-gradient(180deg,#f8fbff 0%,#edf4ff 100%);
}
.hero h1 { margin:0; font-size:clamp(38px,4.5vw,58px); line-height:1.18; letter-spacing:0; }
.hero h1 span { color:var(--blue); }
.hero p { max-width:560px; margin:28px 0 0; color:#4b5563; font-size:18px; }
.hero-actions { display:flex; gap:18px; margin-top:42px; }
.button {
  display:inline-flex; align-items:center; justify-content:center; min-height:48px; padding:0 26px;
  border-radius:999px; font-weight:850; border:1px solid transparent;
}
.button.primary { color:#fff; background:linear-gradient(135deg,var(--blue),var(--purple)); box-shadow:0 16px 34px rgba(59,99,255,.24); }
.button.secondary { color:#111827; background:#fff; border-color:#cfd7e6; }
.button.white { color:var(--blue); background:#fff; }
.button.ghost { color:#fff; border-color:rgba(255,255,255,.55); }

.matrix img { width:100%; max-width:560px; margin:0 auto; filter:drop-shadow(0 28px 50px rgba(59,99,255,.16)); }

.stats {
  display:grid; grid-template-columns:repeat(4,1fr); gap:18px;
  padding:24px max(32px, calc((100vw - 1120px) / 2)); background:#fff; border-bottom:1px solid var(--line);
}
.stats article { display:flex; justify-content:center; align-items:center; gap:12px; }
.stats strong { color:var(--blue); font-size:30px; line-height:1; }
.stats span { color:#4b5563; font-size:14px; }

.section { width:min(1120px, calc(100% - 32px)); margin:0 auto; padding:72px 0; }
.section-heading { margin:0 auto 34px; text-align:center; }
.section-heading h2 { margin:0; font-size:34px; line-height:1.15; }
.section-heading p { margin:10px 0 0; color:var(--muted); }
.capability-grid { display:grid; grid-template-columns:repeat(6,1fr); gap:16px; }
.capability-grid article, .case-card, .work-grid article, .coop-grid article {
  background:#fff; border:1px solid var(--line); border-radius:10px; box-shadow:0 12px 32px rgba(17,24,39,.06);
}
.capability-grid article { min-height:210px; padding:26px 18px; text-align:center; }
.capability-grid span { display:inline-flex; align-items:center; justify-content:center; width:44px; height:44px; margin-bottom:14px; color:#fff; background:linear-gradient(135deg,var(--blue),var(--purple)); border-radius:50%; font-weight:900; }
.capability-grid h3 { margin:0 0 10px; font-size:17px; }
.capability-grid p, .case-card p, .work-grid p, .coop-grid p, .about p { margin:0; color:var(--muted); font-size:14px; }

.cases-section { padding-top:36px; }
.case-tabs { display:flex; justify-content:center; flex-wrap:wrap; gap:12px; margin-bottom:26px; }
.case-tabs button { height:34px; padding:0 20px; color:#4b5563; background:#fff; border:1px solid var(--line); border-radius:999px; font-weight:760; }
.case-tabs button.active { color:#fff; background:linear-gradient(135deg,var(--blue),var(--purple)); }
.case-grid { display:grid; grid-template-columns:repeat(6,1fr); gap:14px; }
.case-card { overflow:hidden; }
.case-visual { width:100%; height:116px; object-fit:cover; background:#eef3ff; }
.case-card h3 { margin:14px 14px 6px; font-size:16px; }
.case-card p { margin:0 14px 12px; }
.case-card div:last-child { display:flex; flex-wrap:wrap; gap:6px; padding:0 14px 16px; }
.case-card span { padding:3px 7px; color:var(--blue); background:#eef3ff; border-radius:6px; font-size:12px; font-weight:760; }
.case-link { display:inline-flex; margin:0 14px 16px; color:var(--blue); font-size:13px; font-weight:850; }

.fit-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.fit-grid article { padding:20px; background:var(--soft); border:1px solid var(--line); border-radius:10px; color:#253044; font-weight:760; }
.work-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.work-grid article { padding:26px; }
.work-grid strong { color:var(--blue); font-size:24px; }
.work-grid h3, .coop-grid h3 { margin:8px 0 8px; font-size:20px; }
.coop-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.coop-grid article { padding:24px; }
.coop-grid a { display:inline-flex; margin-top:16px; color:var(--blue); font-weight:850; }
.about { display:grid; grid-template-columns:1fr; }
.about > div { padding:44px; background:linear-gradient(135deg,#f8fbff,#fff); border:1px solid var(--line); border-radius:14px; }
.about h2 { margin:0 0 16px; font-size:34px; }
.about p + p { margin-top:14px; }

.cta {
  width:min(1120px, calc(100% - 32px)); margin:30px auto 0; padding:46px; display:grid; grid-template-columns:1fr 380px; gap:38px; align-items:center;
  color:#fff; background:linear-gradient(135deg,var(--blue),var(--purple)); border-radius:16px; overflow:hidden;
}
.cta h2 { margin:0; font-size:36px; line-height:1.2; }
.cta p { color:rgba(255,255,255,.82); }
.cta-actions { display:flex; gap:16px; margin-top:26px; }
.contact-form { display:grid; gap:10px; padding:18px; background:rgba(255,255,255,.14); border:1px solid rgba(255,255,255,.24); border-radius:12px; }
.contact-form input, .contact-form select, .contact-form textarea {
  width:100%; min-height:40px; padding:0 12px; border:0; border-radius:8px; font:inherit;
}
.contact-form textarea { min-height:84px; padding-top:10px; resize:vertical; }
.contact-form button { min-height:42px; color:var(--blue); background:#fff; border:0; border-radius:8px; font-weight:900; }

.site-footer { display:flex; justify-content:space-between; align-items:center; gap:24px; width:min(1120px, calc(100% - 32px)); margin:0 auto; padding:34px 0; color:var(--muted); }
.footer-brand { display:flex; align-items:center; gap:10px; color:var(--ink); font-weight:900; }
.footer-links { display:flex; flex-wrap:wrap; justify-content:flex-end; gap:12px 18px; }

@media (max-width: 980px) {
  .site-header { grid-template-columns:auto auto; height:auto; min-height:68px; padding:12px 16px; }
  .site-nav, .nav-cta { display:none; }
  .menu-button { display:block; }
  .site-nav.is-open {
    position:absolute; top:calc(100% + 8px); left:12px; right:12px; display:flex; flex-direction:column; align-items:stretch; gap:0; padding:8px; background:#fff; border:1px solid var(--line); border-radius:10px; box-shadow:var(--shadow);
  }
  .site-nav.is-open a { padding:12px; }
  .site-nav.is-open a::after { display:none; }
  .hero { grid-template-columns:1fr; padding:104px 20px 46px; text-align:center; }
  .hero p { margin-left:auto; margin-right:auto; }
  .hero-actions { justify-content:center; }
  .matrix img { max-width:520px; }
  .stats, .capability-grid, .case-grid, .fit-grid, .work-grid, .coop-grid, .cta { grid-template-columns:1fr; }
  .capability-grid, .case-grid { display:grid; }
  .site-footer { flex-direction:column; align-items:flex-start; }
  .footer-links { justify-content:flex-start; }
}

@media (max-width: 560px) {
  .hero h1 { font-size:36px; }
  .hero-actions, .cta-actions { flex-direction:column; }
  .button { width:100%; }
  .matrix img { max-width:100%; }
  .stats { grid-template-columns:1fr 1fr; }
  .section { padding:52px 0; }
  .cta { padding:30px 20px; }
  .cta h2 { font-size:28px; }
}