:root {
  --bg: #f5f5f7;
  --ink: #1d1d1f;
  --secondary: #515154;
  --quiet: #6e6e73;
  --blue: #0066cc;
  --line: rgba(29, 29, 31, .14);
  --ease: cubic-bezier(.2, .75, .25, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
button { font: inherit; }
::selection { background: var(--blue); color: #fff; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 56px; z-index: 20; background: #fff; padding: 8px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(245, 245, 247, .94);
  backdrop-filter: blur(16px);
  transition: box-shadow .3s var(--ease);
}
.site-header.scrolled { box-shadow: 0 1px 0 rgba(0, 0, 0, .1); }
.nav {
  max-width: 1120px;
  min-height: 58px;
  margin: auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 13px;
}
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 650; text-decoration: none; white-space: nowrap; }
.brand img { border-radius: 7px; }
.nav-items { display: flex; align-items: center; gap: 24px; }
.nav-items a, .footer a { text-decoration: none; }
.nav-items a { color: var(--secondary); white-space: nowrap; }
.nav-items a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav-items a:hover, .footer a:hover, .inline-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.nav-action, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--blue);
  color: #fff;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 600;
  transition: background .2s ease, transform .15s ease;
}
.nav-action { padding: 6px 14px; white-space: nowrap; }
.button { min-height: 48px; padding: 12px 23px; }
.nav-action:hover, .button:hover { background: #004b99; }
.nav-action:active, .button:active { transform: scale(.97); }
.column { width: min(100% - 40px, 640px); margin-inline: auto; }
.hero { padding-top: clamp(112px, 17vh, 175px); padding-bottom: 72px; }
.hero h1 { max-width: 600px; margin: 0 0 28px; font-size: clamp(46px, 7vw, 76px); font-weight: 650; line-height: 1.1; letter-spacing: -.04em; }
.lead { max-width: 34ch; margin: 0; font-size: 19px; line-height: 1.7; }
.hero-actions { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; margin: 34px 0 18px; }
.inline-link { color: var(--blue); font-size: 16px; text-decoration: none; }
.small { color: var(--secondary); font-size: 15px; line-height: 1.65; }
section:not(.hero) { padding-top: 96px; }
h2 { max-width: 18ch; margin: 0 0 20px; font-size: clamp(31px, 4vw, 43px); font-weight: 650; line-height: 1.2; letter-spacing: -.04em; }
h3 { font-weight: 650; }
.section-head p, .section-intro { max-width: 35ch; margin: 0 0 34px; font-size: 18px; line-height: 1.65; }
.feature-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 48px; margin: 8px 0 0; padding: 0; list-style: none; }
.feature-list h3 { margin: 0 0 8px; font-size: 19px; letter-spacing: -.02em; }
.feature-list p { margin: 0; color: var(--secondary); font-size: 16px; line-height: 1.55; }
.showcase { padding-bottom: 8px; }
.screen-switch { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; padding: 4px 0 12px; }
.screen-switch button { min-height: 40px; padding: 8px 15px; border: 0; border-radius: 999px; background: transparent; color: var(--secondary); cursor: pointer; font-size: 15px; transition: background .2s ease, color .2s ease; }
.screen-switch button:hover { background: #e6e6eb; }
.screen-switch button.selected { background: var(--ink); color: #fff; }
.main-shot { margin: 0; border-radius: 18px; background: #e6e6e9; padding: 34px 18px 20px; text-align: center; }
.main-shot img { display: block; width: min(100%, 360px); max-height: 720px; height: auto; margin: auto; border-radius: 22px; object-fit: contain; object-position: top; }
.main-shot figcaption { padding-top: 16px; color: var(--secondary); font-size: 15px; }
.shot-strip { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin: 18px 0; }
.shot-strip button { flex: 1; min-width: 0; padding: 0; border: 0; background: none; cursor: pointer; }
.shot-strip img { display: block; width: 100%; height: 132px; border-radius: 7px; object-fit: cover; object-position: top; }
.shot-strip button:hover img, .shot-strip button:focus-visible img { outline: 3px solid var(--blue); outline-offset: 2px; }
.guide-list { display: grid; gap: 18px; margin: 0; padding: 0; list-style: none; counter-reset: guide; }
.guide-list li { display: grid; grid-template-columns: 32px minmax(0, 1fr); grid-template-rows: auto auto; column-gap: 12px; counter-increment: guide; }
.guide-list li::before { content: counter(guide); grid-column: 1; grid-row: 1 / 3; color: var(--blue); font-variant-numeric: tabular-nums; font-weight: 650; }
.guide-list strong { grid-column: 2; grid-row: 1; margin-bottom: 2px; }
.guide-list span { grid-column: 2; grid-row: 2; color: var(--secondary); }
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; margin-top: 26px; }
.fact h3 { margin: 0 0 8px; font-size: 17px; letter-spacing: -.02em; }
.fact p { margin: 0; color: var(--secondary); font-size: 15px; line-height: 1.55; }
.platform { padding: 32px 0 36px; }
.platform + .platform { padding-top: 48px; }
.platform-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.platform h3 { margin: 0 0 12px; font-size: 24px; letter-spacing: -.03em; }
.platform-heading span { color: var(--quiet); font-size: 14px; }
.platform p { margin: 0 0 20px; }
.platform code, .hero code { padding: 2px 5px; border-radius: 5px; background: #e5e5ea; font-size: .9em; }
.package-meta { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin: 26px 0 0; padding: 20px 0 0; border-top: 1px solid var(--line); }
.package-meta dt { margin: 0 0 4px; color: var(--quiet); font-size: 13px; }
.package-meta dd { margin: 0; font-size: 14px; line-height: 1.45; }
.package-meta dd, [data-package-size] { font-variant-numeric: tabular-nums; }
.platform code[data-package-file] { white-space: nowrap; }
.compact-steps { margin: 24px 0 0; padding-left: 20px; color: var(--secondary); }
.compact-steps li { margin-bottom: 10px; padding-left: 2px; }
.install-cta { margin-top: 34px; }
.download-summary { display: grid; gap: 2px; margin: 4px 0 0; border-radius: 16px; overflow: hidden; background: #fff; }
.summary-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 20px 22px; text-decoration: none; transition: background .2s ease; }
.summary-row + .summary-row { border-top: 1px solid var(--line); }
.summary-row:hover { background: #f7f7f9; }
.summary-row strong { display: block; font-size: 17px; letter-spacing: -.02em; }
.summary-meta { color: var(--secondary); font-size: 14px; }
.summary-side { display: inline-flex; align-items: center; gap: 14px; color: var(--blue); font-size: 15px; }
.summary-version { font-variant-numeric: tabular-nums; }
.summary-row.is-muted strong, .summary-row.is-muted .summary-side { color: var(--secondary); }
.faq { padding-bottom: 92px; }
.faq p { margin: 0 0 23px; }
.faq strong { font-weight: 650; }
.log { display: flex; flex-direction: column; gap: 8px; margin-top: 6px; }
.log-item { display: flex; gap: 22px; padding: 30px 0; border-top: 1px solid var(--line); }
.log-item:first-child { border-top: 0; }
.log-meta { display: flex; flex: 0 0 120px; flex-direction: column; gap: 4px; }
.log-ver { font-size: 23px; font-weight: 650; letter-spacing: -.03em; }
.log-date { color: var(--secondary); font-size: 14px; }
.log-body { flex: 1; }
.log-body h2 { margin: 0 0 10px; font-size: 24px; letter-spacing: -.03em; }
.log-body p { margin: 0 0 12px; }
.log-body ul { margin: 0; padding-left: 18px; color: var(--secondary); }
.log-body li { margin-bottom: 8px; font-size: 16px; line-height: 1.55; }
.release-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.release { display: flex; flex-direction: column; padding: 26px 24px 24px; border-radius: 18px; background: #fff; }
.release-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.release-heading h3 { margin: 0 0 8px; font-size: 24px; letter-spacing: -.03em; }
.release-state { color: var(--quiet); font-size: 14px; white-space: nowrap; }
.release-file { margin: 0 0 22px; overflow-wrap: anywhere; }
.release-file code { padding: 2px 5px; border-radius: 5px; background: #f0f0f4; font-size: 14px; }
.release-facts { display: grid; gap: 10px; margin: 0 0 24px; }
.release-facts div { display: flex; justify-content: space-between; gap: 12px; }
.release-facts dt { margin: 0; color: var(--quiet); font-size: 14px; }
.release-facts dd { margin: 0; font-size: 15px; font-variant-numeric: tabular-nums; text-align: right; }
.release .button { margin-top: auto; }
.release-actions { display: grid; gap: 8px; margin-top: auto; }
.release-actions .button { width: 100%; }
.release.is-soon { background: #f2f2f5; color: var(--secondary); }
.release.is-soon h3 { color: var(--ink); }
.release-format { margin: 0 0 18px; color: var(--quiet); font-size: 14px; }
.release-file { margin: 14px 0 0; color: var(--quiet); font-size: 13px; overflow-wrap: anywhere; }
.soon-copy { margin: 0 0 20px; font-size: 15px; line-height: 1.55; }
.button.is-disabled, .release.is-soon .button.is-disabled { background: #e5e5ea; color: var(--secondary); cursor: default; pointer-events: none; }
.install-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 34px; }
.install-block h3 { margin: 0 0 14px; font-size: 21px; letter-spacing: -.02em; }
.install-block .compact-steps { margin-top: 0; }
.install-block .small { margin-top: 18px; }
.history-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.download-visual { margin: 26px 0 0; padding: 24px 18px 18px; border-radius: 18px; background: #e6e6e9; text-align: center; }
.download-visual img { display: block; width: min(100%, 280px); height: auto; margin: auto; border-radius: 20px; object-fit: cover; object-position: top; }
.download-visual figcaption { padding-top: 14px; color: var(--secondary); font-size: 15px; }
.history-heading p { margin: 0; }
.history-group { margin-top: 30px; }
.history-group h3 { display: flex; align-items: baseline; gap: 10px; margin: 0; font-size: 17px; letter-spacing: -.02em; }
.history-count { color: var(--quiet); font-size: 13px; font-weight: 400; }
.version-list { margin: 12px 0 0; padding: 0; list-style: none; }
.version-list li { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: center; gap: 16px; padding: 15px 0; border-top: 1px solid var(--line); }
.version-meta { display: flex; align-items: center; gap: 9px; min-width: 0; }
.version-number { font-size: 16px; font-weight: 600; font-variant-numeric: tabular-nums; }
.version-badge { padding: 1px 7px; border-radius: 999px; background: #e5e5ea; color: var(--secondary); font-size: 12px; line-height: 1.7; }
.version-details { color: var(--secondary); font-size: 14px; font-variant-numeric: tabular-nums; }
.version-download { color: var(--blue); font-size: 14px; text-decoration: none; }
.version-download:hover { text-decoration: underline; text-underline-offset: 3px; }
.modal { position: fixed; inset: 0; z-index: 30; display: grid; place-items: center; padding: 20px; background: rgba(29, 29, 31, .28); backdrop-filter: blur(10px); }
.modal[hidden] { display: none; }
.modal-card { position: relative; width: min(100%, 430px); max-height: calc(100vh - 40px); overflow: auto; padding: 32px 28px 28px; border-radius: 24px; background: #fff; box-shadow: 0 12px 48px rgba(0, 0, 0, .18); outline: none; }
.modal-close { position: absolute; top: 12px; right: 12px; width: 34px; height: 34px; display: grid; place-items: center; border: 0; border-radius: 50%; background: transparent; color: var(--secondary); cursor: pointer; }
.modal-close:hover { background: #f2f2f5; color: var(--ink); }
.modal-close svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.modal-eyebrow { margin: 0 0 6px; color: var(--quiet); font-size: 13px; }
.modal-title { margin: 0 0 8px; font-size: 26px; letter-spacing: -.03em; }
.modal-meta { margin: 0 0 20px; color: var(--secondary); font-size: 15px; font-variant-numeric: tabular-nums; }
.modal-links { display: grid; gap: 10px; }
.modal-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 17px; border-radius: 15px; background: #f5f5f7; color: var(--ink); text-decoration: none; }
.modal-link:hover { background: #eeeef2; }
.modal-link-name { font-size: 17px; font-weight: 600; }
.modal-link-code { display: inline-flex; align-items: center; gap: 8px; color: var(--secondary); font-size: 14px; }
.modal-link-code strong { color: var(--ink); font-variant-numeric: tabular-nums; letter-spacing: .02em; }
.modal-copy { min-height: 30px; padding: 4px 10px; border: 0; border-radius: 999px; background: var(--ink); color: #fff; font-size: 12px; cursor: pointer; }
.modal-link-note { display: block; color: var(--quiet); font-size: 13px; }
.modal-note { margin: 18px 0 0; color: var(--quiet); font-size: 13px; line-height: 1.55; }
.footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; padding: 0 0 38px; color: var(--secondary); font-size: 15px; }
.footer div { display: flex; flex-wrap: wrap; gap: 18px; color: var(--ink); }
.reveal, .reveal-slow { opacity: 1; transform: none; }
.js .reveal, .js .reveal-slow { opacity: 0; transform: translateY(18px); }
.js .reveal { transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal-slow { transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .reveal.in, .js .reveal-slow.in { opacity: 1; transform: none; }
.shot-fade { transition: opacity .22s ease; }
.shot-fade.swapping { opacity: 0; }

@media (max-width: 800px) {
  .nav-items { gap: 16px; }
  .nav-items a:nth-child(3) { display: none; }
}
@media (max-width: 600px) {
  .nav { min-height: 56px; padding: 0 18px; }
  .nav-items { gap: 12px; }
  .nav-items a { font-size: 12px; }
  .nav-items a:first-child, .nav-items a:nth-child(4), .nav-items a:nth-child(5) { display: none; }
  .brand { font-size: 12px; }
  .nav-action { padding: 5px 11px; font-size: 12px; }
  .column { width: min(100% - 36px, 640px); }
  .hero { padding-top: 104px; padding-bottom: 42px; }
  section:not(.hero) { padding-top: 78px; }
  .feature-list, .facts { grid-template-columns: 1fr; gap: 24px; }
  .main-shot { padding: 20px 12px 16px; }
  .main-shot img { width: min(100%, 290px); }
  .shot-strip { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 6px; overflow: visible; }
  .shot-strip img { height: 104px; }
  .package-meta { grid-template-columns: 1fr; gap: 12px; }
  .package-meta div { display: grid; grid-template-columns: 78px 1fr; gap: 8px; }
  .package-meta dt { margin: 0; }
  .platform-heading { align-items: flex-start; flex-direction: column; gap: 0; }
  .release-grid, .install-columns { grid-template-columns: 1fr; gap: 16px; }
  .history-heading { flex-direction: column; gap: 6px; }
  .version-list li { grid-template-columns: minmax(0, 1fr) auto; gap: 10px; }
  .version-details { grid-column: 1; color: var(--quiet); }
  .version-download { grid-column: 2; grid-row: 1 / 3; }
  .modal { padding: 14px; }
  .modal-card { padding: 28px 20px 22px; border-radius: 20px; }
  .modal-link { align-items: flex-start; flex-direction: column; gap: 9px; }
  .modal-link-code { flex-wrap: wrap; }
  .faq { padding-bottom: 78px; }
  .log-item { flex-direction: column; gap: 10px; }
  .log-meta { flex-basis: auto; flex-direction: row; align-items: baseline; gap: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .site-header, .nav-action, .button, .screen-switch button, .shot-fade, .js .reveal, .js .reveal-slow { transition: none; }
  .js .reveal, .js .reveal-slow { opacity: 1; transform: none; }
}