:root {
  color-scheme: light;
  --ink: #102019;
  --muted: #617169;
  --green: #08634f;
  --green-dark: #073d31;
  --mint: #63d8bd;
  --line: #dce6e1;
  --wash: #f1f6f3;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; color: var(--ink); background: #fff; }
body, button { font: inherit; letter-spacing: 0; }
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
img { display: block; max-width: 100%; }
svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.8; }

.scroll-progress {
  position: fixed;
  z-index: 200;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: left center;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: 60px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(7, 61, 49, 0.08);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
}
.brand { min-width: 0; display: flex; align-items: center; gap: 9px; }
.brand img { width: 36px; height: 36px; border-radius: 8px; box-shadow: 0 4px 12px rgba(7, 61, 49, 0.12); }
.brand span { min-width: 0; display: flex; flex-direction: column; }
.brand strong { overflow: hidden; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.brand small { margin-top: 2px; color: var(--green); font-size: 9px; font-weight: 700; }
.header-download {
  height: 36px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 6px;
  color: #fff;
  background: var(--green-dark);
  font-size: 12px;
  font-weight: 700;
}
.header-download svg { width: 16px; height: 16px; }

main { overflow: hidden; }
.intro { padding: 54px 20px 50px; background: var(--wash); }
.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--green); font-size: 11px; font-weight: 800; }
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 5px rgba(99, 216, 189, 0.16); }
.intro h1 { margin: 22px 0 17px; font-size: 36px; line-height: 1.14; }
.intro > p { max-width: 490px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.intro-highlights {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid #d4e1db;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.72);
}
.intro-highlights div { min-width: 0; padding: 14px 8px; text-align: center; }
.intro-highlights div + div { border-left: 1px solid #d4e1db; }
.intro-highlights strong { display: block; color: var(--green); font-family: Arial, sans-serif; font-size: 18px; }
.intro-highlights span { display: block; margin-top: 5px; color: var(--muted); font-size: 9px; }
.primary-download, .release-download {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-radius: 7px;
  color: #fff;
  background: var(--green-dark);
  box-shadow: 0 12px 28px rgba(7, 61, 49, 0.16);
}
.primary-download { margin-top: 30px; }
.primary-download svg, .release-download svg { width: 22px; height: 22px; }
.primary-download span { display: flex; flex-direction: column; }
.primary-download strong { font-size: 14px; }
.primary-download small { margin-top: 2px; color: rgba(255,255,255,.68); font-size: 9px; }
.intro-meta {
  margin: 30px 0 0;
  padding: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  border-top: 1px solid #cddbd4;
}
.intro-meta div { min-width: 0; }
.intro-meta dt { color: #7d8d85; font-size: 9px; }
.intro-meta dd { margin: 6px 0 0; font-size: 11px; font-weight: 800; white-space: nowrap; }
.explore-link {
  width: max-content;
  margin: 30px auto 0;
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--green);
  font-size: 11px;
  font-weight: 800;
}
.explore-link svg { width: 16px; height: 16px; animation: cue 1.6s ease-in-out infinite; }

.screen-section { padding: 62px 20px 70px; border-top: 1px solid var(--line); background: #fff; }
.screen-section:nth-of-type(odd) { background: var(--wash); }
.section-copy { max-width: 520px; margin: 0 auto 30px; }
.section-copy > span { color: var(--green); font-family: Arial, sans-serif; font-size: 10px; font-weight: 800; }
.section-copy h2 { margin: 10px 0 10px; font-size: 30px; line-height: 1.2; }
.section-copy p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
.feature-notes {
  margin: 22px 0 0;
  padding: 18px 0 0;
  display: grid;
  gap: 11px;
  border-top: 1px solid var(--line);
  list-style: none;
}
.feature-notes li { display: flex; align-items: center; gap: 10px; color: #405149; font-size: 11px; font-weight: 700; }
.feature-notes li::before { content: ""; width: 6px; height: 6px; flex: 0 0 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 4px rgba(99,216,189,.14); }
.device-wrap { max-width: 390px; margin: 0 auto; }
.device {
  position: relative;
  width: 100%;
  padding: 10px;
  overflow: hidden;
  border: 2px solid #1b2923;
  border-radius: 38px;
  background: #111916;
  box-shadow: 0 24px 54px rgba(7, 61, 49, 0.18);
}
.device img { width: 100%; height: auto; border-radius: 28px; background: #fff; }
.device-status {
  position: absolute;
  z-index: 3;
  top: 17px;
  right: 27px;
  left: 27px;
  display: flex;
  justify-content: space-between;
  color: #15231d;
  font-family: Arial, sans-serif;
  font-size: 8px;
  line-height: 1;
  pointer-events: none;
}
.device-island {
  position: absolute;
  z-index: 4;
  top: 10px;
  left: 50%;
  width: 82px;
  height: 22px;
  border-radius: 0 0 12px 12px;
  background: #111916;
  transform: translateX(-50%);
  pointer-events: none;
}

.js .screen-section .section-copy,
.js .screen-section .device-wrap,
.js .release > *,
.js .institutions-heading,
.js .institution-list > div {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 650ms ease, transform 650ms cubic-bezier(.2,.7,.2,1);
}
.js .screen-section.is-visible .section-copy,
.js .screen-section.is-visible .device-wrap,
.js .release.is-visible > *,
.js .institutions.is-visible .institutions-heading,
.js .institutions.is-visible .institution-list > div { opacity: 1; transform: translateY(0); }
.js .screen-section.is-visible .device-wrap { transition-delay: 120ms; }
.js .release.is-visible > *:nth-child(2),
.js .institutions.is-visible .institution-list > div:nth-child(1) { transition-delay: 80ms; }
.js .release.is-visible > *:nth-child(3),
.js .institutions.is-visible .institution-list > div:nth-child(2) { transition-delay: 140ms; }
.js .release.is-visible > *:nth-child(4),
.js .institutions.is-visible .institution-list > div:nth-child(3) { transition-delay: 200ms; }
.screen-section.is-visible .device { animation: device-float 5s ease-in-out 700ms infinite; }

@keyframes cue {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}
@keyframes device-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.release { padding: 58px 20px; color: #fff; background: var(--green-dark); }
.release-heading { display: flex; align-items: center; gap: 13px; }
.release-heading img { width: 50px; height: 50px; border-radius: 10px; }
.release-heading span { color: #75dfc5; font-family: Arial, sans-serif; font-size: 9px; font-weight: 800; }
.release-heading h2 { margin: 4px 0 0; font-size: 28px; }
.release > p { margin: 22px 0 30px; color: rgba(255,255,255,.62); font-size: 13px; line-height: 1.75; }
.release-details { margin: 0 0 28px; border-top: 1px solid rgba(255,255,255,.16); }
.release-details > div { padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,.16); }
.release-details dt { color: rgba(255,255,255,.48); font-size: 9px; }
.release-details dd { margin: 7px 0 0; font-size: 12px; font-weight: 700; }
.checksum-row dd { display: flex; align-items: center; gap: 10px; }
.checksum-row code { min-width: 0; overflow: hidden; color: #a5ddce; font-family: Consolas, monospace; font-size: 8px; text-overflow: ellipsis; white-space: nowrap; }
.checksum-row button { width: 34px; height: 34px; flex: 0 0 34px; padding: 8px; border: 1px solid rgba(255,255,255,.22); border-radius: 5px; color: #fff; background: transparent; }
.release-download { min-height: 54px; background: #fff; color: var(--green-dark); box-shadow: none; font-size: 13px; font-weight: 800; }
.institutions { padding: 48px 20px 52px; border-bottom: 1px solid var(--line); background: #fff; }
.institutions-heading > span { color: var(--green); font-family: Arial, sans-serif; font-size: 9px; font-weight: 800; }
.institutions-heading h2 { margin: 9px 0 10px; font-size: 28px; line-height: 1.2; }
.institutions-heading p { max-width: 460px; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }
.institution-list { margin-top: 28px; border-top: 1px solid var(--line); }
.institution-list > div { min-height: 66px; padding: 14px 4px; display: grid; grid-template-columns: 34px 1fr; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); }
.institution-list b { color: var(--green); font-family: Arial, sans-serif; font-size: 9px; }
.institution-list strong { font-size: 13px; line-height: 1.55; }
footer { padding: 28px 20px 32px; color: rgba(255,255,255,.65); background: #081a14; }
footer div { display: flex; align-items: center; gap: 10px; color: #fff; }
footer img { width: 34px; height: 34px; border-radius: 7px; }
footer strong { font-size: 11px; }
footer p { margin: 16px 0 0; font-size: 9px; }
.toast {
  position: fixed;
  z-index: 300;
  right: 18px;
  bottom: 22px;
  left: 18px;
  padding: 12px 16px;
  border-radius: 6px;
  color: #fff;
  background: #17251f;
  box-shadow: 0 10px 28px rgba(0,0,0,.24);
  font-size: 11px;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}
.toast.visible { opacity: 1; transform: translateY(0); }
:focus-visible { outline: 3px solid rgba(99,216,189,.55); outline-offset: 3px; }

@media (min-width: 720px) {
  .site-header { height: 68px; padding: 0 max(28px, calc((100vw - 1100px) / 2)); }
  .intro { padding: 76px max(28px, calc((100vw - 1100px) / 2)); }
  .intro h1 { font-size: 52px; }
  .intro > p { font-size: 16px; }
  .intro-highlights { width: 520px; }
  .primary-download { width: 320px; }
  .intro-meta { width: 520px; }
  .screen-section { min-height: 920px; padding: 90px max(28px, calc((100vw - 1040px) / 2)); display: grid; grid-template-columns: .8fr 1.2fr; align-items: center; gap: 80px; }
  .screen-section:nth-of-type(even) .section-copy { order: 2; }
  .section-copy { margin: 0; }
  .section-copy h2 { font-size: 42px; }
  .section-copy p { font-size: 15px; }
  .device-wrap { width: 100%; max-width: 390px; }
  .release, .institutions, footer { padding-right: max(28px, calc((100vw - 1040px) / 2)); padding-left: max(28px, calc((100vw - 1040px) / 2)); }
  .release { display: grid; grid-template-columns: .8fr 1.2fr; column-gap: 90px; }
  .release-heading, .release > p { grid-column: 1; }
  .release-details, .release-download { grid-column: 2; }
  .release-details { grid-row: 1 / span 2; }
  .institutions { display: grid; grid-template-columns: .72fr 1.28fr; align-items: start; gap: 70px; }
  .institutions-heading h2 { font-size: 34px; }
  .institution-list { margin-top: 0; }
}

@media (max-width: 359px) {
  .brand strong { max-width: 150px; }
  .header-download span { display: none; }
  .header-download { width: 36px; padding: 0; justify-content: center; }
  .intro h1 { font-size: 32px; }
  .device { padding: 8px; border-radius: 32px; }
  .device img { border-radius: 24px; }
  .device-status { top: 14px; right: 23px; left: 23px; font-size: 7px; }
  .device-island { top: 8px; width: 70px; height: 19px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: .01ms !important; }
  .explore-link svg,
  .screen-section.is-visible .device { animation: none !important; }
  .js .screen-section .section-copy,
  .js .screen-section .device-wrap,
  .js .release > *,
  .js .institutions-heading,
  .js .institution-list > div { opacity: 1; transform: none; }
}