:root {
  color: #17212b;
  background: #f3f6f7;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-synthesis: none;
  --ink: #17212b;
  --muted: #65717d;
  --line: #d9e1e4;
  --surface: #ffffff;
  --accent: #16697a;
  --accent-dark: #0e4f5d;
  --warm: #df7747;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; }
button, a { font: inherit; }
button { letter-spacing: 0; }

.shell { min-height: 100vh; overflow: hidden; }
.nav {
  width: min(1180px, calc(100% - 48px));
  height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 760; }
.brand img { width: 34px; height: 34px; object-fit: cover; border-radius: 8px; box-shadow: 0 7px 20px rgba(20, 53, 61, .16); }
.api-link { color: var(--muted); text-decoration: none; font-size: 14px; padding: 9px 12px; border-radius: 6px; transition: color .2s ease, background .2s ease; }
.api-link:hover { color: var(--ink); background: rgba(255,255,255,.8); }

.hero {
  width: min(1180px, calc(100% - 48px));
  min-height: min(700px, calc(100vh - 76px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr);
  gap: 64px;
  align-items: center;
  padding: 52px 0 92px;
}
.eyebrow { margin: 0 0 15px; color: var(--accent); font-size: 12px; font-weight: 780; letter-spacing: 0; }
h1 { margin: 0; max-width: 690px; font-size: 72px; line-height: 1.04; font-weight: 790; letter-spacing: 0; }
.intro { max-width: 600px; margin: 28px 0 0; color: var(--muted); font-size: 18px; line-height: 1.8; }
.primary-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 12px; align-items: stretch; }
.download-button, .secondary-button { min-height: 58px; border-radius: 7px; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.download-button { min-width: 260px; padding: 10px 20px 10px 14px; border: 0; background: var(--accent); color: white; display: flex; align-items: center; text-align: left; gap: 13px; box-shadow: 0 12px 28px rgba(22,105,122,.23); }
.download-button:not(:disabled):hover { transform: translateY(-2px); background: var(--accent-dark); box-shadow: 0 16px 32px rgba(22,105,122,.28); }
.download-button:disabled { cursor: wait; opacity: .68; }
.download-button strong, .download-button small { display: block; }
.download-button strong { font-size: 15px; }
.download-button small { margin-top: 2px; opacity: .75; font-size: 12px; }
.button-icon { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 6px; background: rgba(255,255,255,.13); font-size: 22px; }
.secondary-button { padding: 0 19px; border: 1px solid var(--line); color: var(--ink); background: rgba(255,255,255,.72); }
.secondary-button:hover { transform: translateY(-2px); background: white; box-shadow: 0 10px 24px rgba(27,44,49,.08); }
.notice { min-height: 24px; margin: 15px 0 0; color: var(--muted); font-size: 13px; }

.product-visual { position: relative; min-height: 500px; display: grid; place-items: center; }
.icon-stage { position: relative; z-index: 2; width: min(310px, 65vw); aspect-ratio: 1; padding: 20px; border: 1px solid rgba(255,255,255,.7); border-radius: 38px; background: rgba(255,255,255,.48); box-shadow: 0 34px 80px rgba(24,52,59,.17); transform: rotate(5deg); backdrop-filter: blur(16px); }
.icon-stage img { display: block; width: 100%; height: 100%; object-fit: cover; border-radius: 26px; }
.signal { position: absolute; border: 1px solid rgba(22,105,122,.18); border-radius: 50%; animation: breathe 5s ease-in-out infinite; }
.signal-a { width: 390px; height: 390px; }
.signal-b { width: 480px; height: 480px; animation-delay: -1.2s; border-color: rgba(223,119,71,.2); }
.signal-c { width: 570px; height: 570px; animation-delay: -2.4s; }
@keyframes breathe { 0%,100% { transform: scale(.96); opacity: .55; } 50% { transform: scale(1.02); opacity: 1; } }

.releases { padding: 76px max(24px, calc((100% - 1180px)/2)) 88px; background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
h2 { margin: 0; font-size: 30px; line-height: 1.2; letter-spacing: 0; }
.version-pill { padding: 7px 10px; border: 1px solid #b9d9df; border-radius: 999px; color: var(--accent); background: #edf8f9; font-size: 12px; font-weight: 700; }
.release-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.release-card { min-width: 0; padding: 22px; border: 1px solid var(--line); border-radius: 8px; background: #fbfcfc; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.release-card:hover { transform: translateY(-3px); border-color: #b9c9ce; box-shadow: 0 16px 30px rgba(27,44,49,.08); }
.release-card-head { display: flex; justify-content: space-between; align-items: start; gap: 16px; }
.platform-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 7px; color: var(--accent); background: #e7f2f4; font-size: 17px; font-weight: 800; }
.release-card h3 { margin: 16px 0 5px; font-size: 17px; letter-spacing: 0; }
.release-meta { color: var(--muted); font-size: 13px; }
.release-card a { margin-top: 20px; height: 40px; display: inline-flex; align-items: center; gap: 7px; color: var(--accent); text-decoration: none; font-size: 14px; font-weight: 720; }
.checksum { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); color: #7a858e; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 11px; overflow-wrap: anywhere; }
.empty { grid-column: 1 / -1; padding: 48px; border: 1px dashed #c8d2d6; border-radius: 8px; color: var(--muted); text-align: center; }

.integrity { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 82px 0; display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; align-items: start; }
.integrity > p { margin: 0; max-width: 670px; color: var(--muted); font-size: 17px; line-height: 1.75; }
footer { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 24px 0 30px; border-top: 1px solid var(--line); color: var(--muted); display: flex; justify-content: space-between; gap: 20px; font-size: 12px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 12px; padding-top: 54px; }
  .product-visual { min-height: 430px; order: -1; }
  .icon-stage { width: 230px; }
  .signal-a { width: 290px; height: 290px; }
  .signal-b { width: 350px; height: 350px; }
  .signal-c { width: 410px; height: 410px; }
  .release-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .integrity { grid-template-columns: 1fr; gap: 24px; }
  h1 { font-size: 56px; }
}

@media (max-width: 620px) {
  .nav, .hero, .integrity, footer { width: min(100% - 32px, 1180px); }
  .nav { height: 64px; }
  .hero { min-height: auto; padding: 28px 0 68px; }
  .product-visual { min-height: 320px; }
  .icon-stage { width: 180px; border-radius: 28px; padding: 14px; }
  .icon-stage img { border-radius: 19px; }
  .signal-a { width: 225px; height: 225px; }
  .signal-b { width: 275px; height: 275px; }
  .signal-c { width: 320px; height: 320px; }
  h1 { font-size: 44px; }
  .intro { font-size: 16px; }
  .primary-actions { display: grid; }
  .download-button { width: 100%; }
  .releases { padding: 58px 16px 66px; }
  .release-grid { grid-template-columns: 1fr; }
  .section-heading { align-items: start; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}