:root {
  color-scheme: light;
  --page: #f5f7f4;
  --surface: #ffffff;
  --text: #202e29;
  --muted: #65726a;
  --accent: #27634d;
  --accent-dark: #1c4c3a;
  --accent-soft: #eaf1e9;
  --line: #e1e7df;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { background: var(--page); scroll-padding-top: 24px; }
body { margin: 0; color: var(--text); font-size: 15px; line-height: 1.7; }
a { color: var(--accent); text-underline-offset: 4px; }
a:focus-visible, summary:focus-visible { outline: 3px solid #83ae92; outline-offset: 5px; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
p, h1, h2, h3 { margin: 0; }
h1, h2, h3 { font-weight: 650; }

.skip-link { position: absolute; top: 12px; left: 12px; z-index: 2; padding: 8px 14px; transform: translateY(-160%); border-radius: 8px; background: var(--text); color: white; }
.skip-link:focus { transform: translateY(0); }
.page-shell { width: min(100%, 800px); margin: 0 auto; padding: 0 22px; }
.site-header { display: flex; align-items: center; gap: 10px; padding: 30px 0; }
.brand-mark { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 10px; background: var(--accent); color: #fff; font-size: 18px; font-weight: 600; line-height: 1; }
.brand-name { font-size: 18px; font-weight: 650; letter-spacing: .04em; }
.platform-label { margin-left: auto; color: var(--muted); font-size: 12px; }

.hero { padding: 27px 0 30px; }
.release-label { display: inline-flex; align-items: center; gap: 7px; padding: 4px 10px; border: 1px solid #d9e5d7; border-radius: 100px; background: #edf3eb; color: var(--accent); font-size: 12px; font-weight: 600; }
.status-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
h1 { margin-top: 18px; font-size: clamp(27px, 5.5vw, 42px); line-height: 1.3; letter-spacing: -.035em; }
.intro { margin-top: 14px; color: var(--muted); font-size: 16px; }
.release-meta { display: flex; align-items: center; gap: 10px; margin-top: 13px; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.download-panel { margin-top: 27px; }
.primary-button { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 58px; padding: 14px 21px; border: 1px solid var(--accent); border-radius: 13px; background: var(--accent); color: white; font-size: 17px; font-weight: 600; text-decoration: none; transition: background-color .15s ease; }
.primary-button:hover { background: var(--accent-dark); }
.download-arrow { font-size: 24px; font-weight: 400; line-height: 1; }
.download-hint { margin-top: 10px; color: var(--muted); font-size: 12px; }
.backup-link { display: inline-flex; align-items: center; gap: 4px; min-height: 44px; margin-top: 3px; font-size: 13px; text-decoration: none; }
.backup-link > span:first-child { color: var(--muted); }
.backup-link > span:last-child { margin-left: 3px; font-size: 15px; }
.backup-link:hover, .text-link:hover { text-decoration: underline; }
.availability-note { margin-top: 14px; padding-left: 13px; border-left: 2px solid #c8d7c6; color: var(--muted); font-size: 13px; line-height: 1.8; }
.note-label { display: block; margin-bottom: 2px; color: #42594c; font-size: 12px; font-weight: 650; }

.section-card { margin-top: 20px; padding: 25px 23px; border: 1px solid var(--line); border-radius: 19px; background: var(--surface); }
.section-heading { margin-bottom: 23px; }
.eyebrow { margin-bottom: 5px; color: var(--muted); font-size: 11px; letter-spacing: .12em; }
h2 { font-size: 21px; line-height: 1.45; letter-spacing: -.02em; }
.install-steps { display: grid; gap: 24px; margin: 0; padding: 0; list-style: none; counter-reset: step; }
.install-steps > li { display: flex; align-items: flex-start; gap: 13px; counter-increment: step; }
.install-steps > li::before { display: grid; flex: 0 0 27px; height: 27px; margin-top: 1px; place-items: center; border: 1px solid #dbe5d9; border-radius: 50%; background: #f4f7f1; color: var(--accent); content: counter(step); font-size: 12px; font-weight: 600; line-height: 1; }
.install-steps h3 { margin-bottom: 4px; font-size: 15px; }
.install-steps p { color: var(--muted); font-size: 13px; line-height: 1.8; }
.actions-note { margin-top: 26px; padding: 16px; border-radius: 12px; background: #f3f6f0; color: var(--muted); font-size: 13px; }
.actions-note strong { color: #455a4c; font-size: 13px; font-weight: 600; }
.text-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; margin-bottom: -8px; text-decoration: none; font-size: 13px; font-weight: 500; }
.updates-heading { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 10px; }
.version-date { padding-bottom: 3px; color: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.update-list { display: grid; gap: 19px; margin: 0; padding: 0; list-style: none; }
.update-list li { position: relative; padding-left: 14px; }
.update-list li::before { position: absolute; top: 10px; left: 0; width: 4px; height: 4px; border-radius: 50%; background: #7e9c7f; content: ""; }
.update-list strong { font-size: 14px; font-weight: 600; }
.update-list p { margin-top: 3px; color: var(--muted); font-size: 13px; line-height: 1.8; }

.faq-section { margin-top: 40px; }
.faq-section > h2 { margin-bottom: 13px; padding-left: 1px; font-size: 18px; }
.disclosure-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 18px 29px 18px 1px; cursor: pointer; list-style: none; font-size: 14px; font-weight: 500; }
summary::-webkit-details-marker { display: none; }
summary::after { position: absolute; top: 18px; right: 3px; color: var(--muted); content: "+"; font-size: 19px; font-weight: 400; line-height: 1.4; }
details[open] > summary::after { content: "−"; }
.disclosure-body { padding: 0 22px 19px 1px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.file-metadata { display: grid; gap: 10px; margin: 0; }
.file-metadata > div { display: grid; grid-template-columns: 58px minmax(0, 1fr); gap: 10px; }
.file-metadata dt { color: #46574c; font-size: 12px; }
.file-metadata dd { margin: 0; overflow-wrap: anywhere; font-size: 12px; }
.file-metadata code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 11px; }
.site-footer { display: flex; flex-wrap: wrap; gap: 8px 12px; margin-top: 36px; padding: 0 1px max(30px, env(safe-area-inset-bottom)); color: #7a857e; font-size: 11px; }
.footer-brand { color: #526357; font-weight: 600; }

@media (min-width: 600px) {
  .page-shell { padding: 0 40px; }
  .site-header { padding: 38px 0; }
  .hero { padding: 30px 0 34px; }
  .download-panel { max-width: 395px; }
  .availability-note { max-width: 600px; margin-top: 19px; }
  .section-card { margin-top: 24px; padding: 30px; }
  .install-steps { gap: 23px; }
  .actions-note { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 17px 19px; }
  .text-link { flex-shrink: 0; margin-bottom: 0; }
  .update-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 23px 28px; }
  .faq-section { margin-top: 43px; padding: 0 6px; }
  .site-footer { margin-top: 41px; }
}

@media (prefers-reduced-motion: reduce) {
  .primary-button { transition: none; }
}