:root {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: #183154;
  background: #f7f9fc;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid #5483f3; outline-offset: 5px; border-radius: 4px; }

.page-shell { max-width: 1600px; min-height: 100vh; margin: auto; overflow: hidden; }
.site-header, .hero, .about, .site-footer { padding-left: clamp(24px, 7vw, 112px); padding-right: clamp(24px, 7vw, 112px); }
.site-header { height: 104px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 13px; font-size: 19px; font-weight: 750; letter-spacing: .025em; white-space: nowrap; }
.brand-light { font-weight: 450; }
.brand-mark { display: block; width: 44px; height: 44px; object-fit: contain; }
.header-link { font-size: 14px; font-weight: 600; transition: color .2s; }
.header-link:hover, .footer-top a:hover { color: #3469dc; }
.header-link span { margin-left: 5px; font-size: 17px; }

.hero { position: relative; min-height: 630px; display: flex; align-items: center; isolation: isolate; }
.hero-content { position: relative; z-index: 1; padding-top: 12px; padding-bottom: 90px; }
.hero-name { margin: 0 0 24px; color: #4572cf; font-size: 12px; font-weight: 700; letter-spacing: .24em; }
h1 { margin: 0; font-size: clamp(42px, 5.3vw, 76px); line-height: 1.28; font-weight: 740; letter-spacing: -.055em; }
h1 span { color: #4778e1; }
.hero-description { margin: 27px 0 34px; color: #64748c; font-size: clamp(15px, 1.25vw, 18px); line-height: 1.95; }
.primary-link { display: inline-flex; align-items: center; gap: 24px; min-height: 48px; padding: 0 21px; border-radius: 9px; background: #315fce; color: #fff; font-size: 14px; font-weight: 650; box-shadow: 0 10px 25px #315fce26; transition: background .2s, transform .2s; }
.primary-link:hover { background: #254fae; transform: translateY(-2px); }
.primary-link span { font-size: 19px; line-height: 1; }

.hero-art { position: absolute; z-index: -1; right: 1%; top: 2%; width: min(57vw, 780px); aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 52% 48%, #dce9ff 0 19%, #eaf2ff 36%, #f7f9fc 68%); }
.art-orbit { position: absolute; border: 1px solid #a8c3f660; border-radius: 50%; transform: rotate(-24deg); }
.art-orbit-one { inset: 12% 4%; }
.art-orbit-two { inset: 23% 15%; }
.art-logo { position: absolute; left: 24%; top: 23%; width: 52%; height: 52%; object-fit: contain; filter: drop-shadow(22px 30px 34px #416fd42b); transform: rotate(-10deg); }
.art-spark { position: absolute; display: block; border-radius: 50%; background: #80a7ed; }
.art-spark-one { width: 9px; height: 9px; top: 17%; left: 33%; }
.art-spark-two { width: 6px; height: 6px; right: 16%; top: 37%; }
.art-spark-three { width: 12px; height: 12px; bottom: 22%; left: 15%; background: #bad0f5; }

.about { display: grid; grid-template-columns: minmax(150px, 1fr) minmax(0, 2fr); gap: 40px; padding-top: 82px; padding-bottom: 100px; border-top: 1px solid #e5ebf5; }
.section-index { padding-top: 8px; color: #7290c0; font-size: 12px; font-weight: 700; letter-spacing: .18em; }
.about-copy { max-width: 620px; }
.about h2 { margin: 0 0 20px; font-size: clamp(30px, 3vw, 42px); line-height: 1.3; letter-spacing: -.04em; }
.about p { margin: 0; color: #64748c; font-size: 17px; line-height: 2; }
.coming-soon { display: inline-block; margin-top: 36px; padding: 10px 16px; border: 1px solid #d9e4f7; border-radius: 8px; color: #4c6da5; background: #f1f5fc; font-size: 13px; }

.site-footer { padding-top: 34px; padding-bottom: 30px; background: #edf2fa; }
.footer-top { display: flex; justify-content: space-between; align-items: center; padding-bottom: 35px; border-bottom: 1px solid #dce5f2; }
.footer-name { font-size: 18px; font-weight: 700; }
.footer-top a { color: #627792; font-size: 13px; transition: color .2s; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 12px 28px; padding-top: 26px; color: #70819a; font-size: 12px; }

@media (max-width: 760px) {
  .site-header { height: 76px; }
  .brand { font-size: 17px; }
  .brand-mark { width: 38px; height: 38px; }
  .hero { min-height: 700px; align-items: flex-start; }
  .hero-content { padding-top: 58px; padding-bottom: 250px; }
  .hero-name { margin-bottom: 20px; }
  .hero-description { margin-top: 24px; }
  .hero-art { width: 510px; max-width: 120vw; top: auto; bottom: -70px; right: -130px; }
  .about { grid-template-columns: 1fr; gap: 22px; padding-top: 65px; padding-bottom: 80px; }
  .about p { font-size: 15px; }
  .footer-bottom { flex-direction: column; gap: 12px; }
}

@media (max-width: 420px) {
  .header-link { font-size: 13px; }
  .hero { min-height: 710px; }
  .hero-content { padding-top: 44px; }
  h1 { font-size: 36px; }
  .hero-art { width: 360px; right: -65px; bottom: -50px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .primary-link, .header-link, .footer-top a { transition: none; }
}