:root {
  color-scheme: light;
  --text: #252525;
  --muted: #666a67;
  --line: #e6e9e5;
  --yellow: #ffda44;
  --green: #2e7d59;
  --surface: #f5f8f5;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.65;
  letter-spacing: 0;
}
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--green); outline-offset: 4px; }
.wrap { width: calc(100% - 64px); max-width: 1080px; margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding-top: env(safe-area-inset-top, 0px);
  border-bottom: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 2px 8px #0000000a;
}
.header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 700; font-size: 20px; }
.brand img { object-fit: contain; border-radius: 8px; }
.home-link { color: var(--green); font-size: 14px; font-weight: 600; text-decoration: none; white-space: nowrap; }
.home-link span { margin-left: 5px; font-size: 18px; }
.home-link:hover { text-decoration: underline; }
.intro { background: var(--yellow); padding: 64px 0 42px; }
.eyebrow { margin: 0 0 16px; font-size: 12px; font-weight: 700; color: #4b4e38; }
h1 { font-size: 56px; line-height: 1.15; margin: 0 0 24px; font-weight: 750; }
.intro-copy { margin: 0; max-width: 660px; font-size: 18px; line-height: 1.85; }
.download-row { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; margin-top: 32px; }
.download-button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 52px; padding: 11px 24px; border-radius: 6px; background: #252525; color: #fff; text-decoration: none; font-weight: 700; font-size: 15px; }
.download-button:hover { background: #414141; }
.download-symbol { font-size: 23px; line-height: 1; }
.release-summary { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; font-size: 13px; color: #494936; }
.package-size:empty { display: none; }
.feature-points { list-style: none; display: flex; gap: 24px; flex-wrap: wrap; padding: 0; margin: 36px 0 0; font-size: 13px; }
.feature-points li::before { content: "\2713"; font-weight: 700; padding-right: 7px; }
h2 { margin: 0; font-size: 26px; line-height: 1.4; }
.features-section { padding: 40px 0 48px; }
.features { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; margin-top: 30px; }
.features article { border-top: 2px solid var(--line); padding-top: 20px; min-width: 0; }
.feature-number { color: var(--green); font-size: 13px; font-weight: 700; }
h3 { margin: 10px 0 12px; font-size: 17px; line-height: 1.5; }
.features p { color: var(--muted); font-size: 14px; margin: 0; line-height: 1.85; }
.release-section { padding: 42px 0; background: var(--surface); border-top: 1px solid var(--line); }
.release-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; }
.release-section .eyebrow { color: var(--green); margin-bottom: 10px; }
.release-section h2 span { font-weight: 500; font-size: 18px; color: var(--muted); }
.release-copy { color: var(--muted); font-size: 14px; margin: 16px 0 22px; line-height: 1.85; }
.secondary-download { display: inline-flex; align-items: center; gap: 12px; padding: 10px 0; color: var(--green); text-decoration: none; border-bottom: 1px solid var(--green); font-size: 14px; font-weight: 700; }
.release-facts { margin: 0; border-top: 1px solid #dbe1dc; font-size: 13px; }
.release-facts div { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 12px; padding: 12px 0; border-bottom: 1px solid #dbe1dc; }
dt { color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
.sha-row dd { font-family: Consolas, monospace; font-size: 11px; line-height: 1.8; }
footer { padding: 24px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
footer a { color: var(--green); text-decoration: none; }

@media (max-width: 800px) {
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; }
  .release-layout { gap: 32px; }
}

@media (max-width: 520px) {
  .wrap { width: calc(100% - 40px); }
  .header-inner { min-height: 70px; }
  .brand { font-size: 18px; gap: 10px; }
  .brand img { width: 34px; height: 34px; }
  .home-link { font-size: 13px; }
  .intro { padding: 42px 0 30px; }
  h1 { font-size: 44px; margin-bottom: 20px; }
  .intro-copy { font-size: 16px; }
  .desktop-break { display: none; }
  .download-row { gap: 18px; margin-top: 26px; }
  .download-button { width: 100%; min-height: 50px; }
  .feature-points { margin-top: 26px; gap: 9px 20px; font-size: 12px; }
  h2 { font-size: 22px; }
  .features-section { padding: 30px 0 34px; }
  .features { gap: 22px 20px; margin-top: 22px; }
  h3 { font-size: 15px; }
  .features p { font-size: 13px; }
  .release-layout { grid-template-columns: 1fr; gap: 26px; }
  .release-section { padding: 30px 0; }
  .release-facts div { grid-template-columns: 66px minmax(0, 1fr); }
}