:root{color-scheme:light;--ink:#15181d;--muted:#626b78;--line:#dfe3e8;--paper:#fff;--canvas:#f4f6f8;--blue:#0758b7;--blue-dark:#06458f;--green:#18783f;--green-dark:#105e30;--focus:#d2e5ff}
*{box-sizing:border-box}
html{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;background:var(--canvas);color:var(--ink);letter-spacing:0}
body{margin:0;min-width:320px;background:var(--canvas)}
a{color:inherit}
.download-shell{width:min(1180px,calc(100% - 40px));margin:0 auto}
.download-header{height:76px;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.download-brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0}
.download-brand img{width:48px;height:48px;object-fit:contain;border-radius:50%}
.download-brand span{display:flex;flex-direction:column;min-width:0}
.download-brand strong{font-size:21px;line-height:1.2}
.download-brand small{margin-top:4px;color:var(--muted);font-size:12px}
.download-header nav{display:flex;align-items:center;gap:6px}
.download-header nav a{padding:10px 12px;text-decoration:none;font-size:14px;font-weight:650;border-bottom:2px solid transparent}
.download-header nav a:hover,.download-header nav a:focus-visible{color:var(--blue);border-bottom-color:var(--blue);outline:none}
.download-intro{background:#fff;border-bottom:1px solid var(--line)}
.intro-layout{min-height:210px;padding:38px 0;display:flex;align-items:center;justify-content:space-between;gap:40px}
.official-label{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-size:14px;font-weight:750}
.download-intro h1{margin:14px 0 10px;font-size:42px;line-height:1.16;letter-spacing:0}
.download-intro p{margin:0;color:var(--muted);font-size:18px}
.release-status{flex:0 0 230px;min-height:122px;padding:22px 24px;border-left:4px solid var(--blue);background:#f2f6fb;display:flex;flex-direction:column;justify-content:center}
.release-status span,.release-status small{color:var(--muted);font-size:13px}
.release-status strong{margin:5px 0;font-size:32px;line-height:1;color:var(--ink)}
.download-options{padding:34px 0 38px}
.platform-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.platform-card{position:relative;min-width:0;padding:28px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 5px 16px rgba(25,35,48,.06)}
.platform-card.is-recommended{border-color:#84aee0;box-shadow:0 0 0 3px var(--focus),0 6px 18px rgba(25,35,48,.08)}
.platform-card>header{display:flex;align-items:center;gap:16px;min-height:66px}
.platform-mark{flex:0 0 62px;width:62px;height:62px;display:grid;place-items:center;border-radius:8px;color:#fff;font-size:31px}
.platform-mark.android{background:var(--green)}
.platform-mark.windows{background:var(--blue)}
.platform-card h2{margin:2px 0 5px;font-size:22px;line-height:1.2}
.platform-card header p{margin:0;color:var(--muted);font-size:14px}
.device-recommendation{display:block;margin-bottom:5px;color:var(--blue);font-size:12px;font-weight:750}
.device-recommendation[hidden]{display:none!important}
.release-meta{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin:25px 0 22px;border:1px solid var(--line);border-width:1px 0}
.release-meta div{padding:14px 8px}
.release-meta div+div{border-left:1px solid var(--line)}
.release-meta dt{color:var(--muted);font-size:12px}
.release-meta dd{margin:6px 0 0;font-size:15px;font-weight:750;overflow-wrap:anywhere}
.download-action{width:100%;min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:6px;color:#fff;text-decoration:none;font-size:16px;font-weight:750;transition:background-color .18s ease,transform .18s ease}
.download-action.android{background:var(--green)}
.download-action.android:hover{background:var(--green-dark)}
.download-action.windows{background:var(--blue)}
.download-action.windows:hover{background:var(--blue-dark)}
.download-action:hover{transform:translateY(-1px)}
.download-action:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.download-action.unavailable{background:#727983}
.system-requirement{margin:13px 0 0;text-align:center;color:var(--muted);font-size:13px}
.checksum{margin-top:18px;border-top:1px solid var(--line);padding-top:14px}
.checksum summary{cursor:pointer;color:#394452;font-size:13px;font-weight:700}
.checksum code{display:block;margin-top:10px;padding:10px;background:#f5f7f9;border:1px solid var(--line);font-size:11px;line-height:1.6;overflow-wrap:anywhere;user-select:all}
.download-security{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.security-layout{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.security-layout>div:first-child{display:flex;align-items:center;gap:14px;min-width:0}
.security-layout i{color:var(--green);font-size:24px}
.security-layout span{display:flex;flex-direction:column;min-width:0}
.security-layout strong{font-size:15px}
.security-layout small{margin-top:5px;color:var(--muted);font-size:13px;line-height:1.45}
.support-links{display:flex;align-items:center;gap:18px;white-space:nowrap}
.support-links a{color:var(--blue);font-size:14px;font-weight:700;text-decoration:none}
.support-links a:hover{text-decoration:underline}
.download-footer{padding:22px 0;background:#20252c;color:#f3f5f7}
.download-footer .download-shell{display:flex;justify-content:space-between;gap:20px;font-size:13px}
@media(max-width:760px){
  .download-shell{width:min(100% - 28px,680px)}
  .download-header{height:auto;min-height:68px}
  .header-inner{padding:10px 0}
  .download-brand img{width:42px;height:42px}
  .download-brand small{display:none}
  .download-header nav a{padding:9px 6px;font-size:13px}
  .download-header nav a:nth-child(3){display:none}
  .intro-layout{min-height:0;padding:28px 0;display:block}
  .download-intro h1{font-size:32px}
  .download-intro p{font-size:16px}
  .release-status{margin-top:22px;min-height:0;padding:15px 18px;display:grid;grid-template-columns:auto 1fr;align-items:center;column-gap:12px}
  .release-status strong{grid-row:1 / span 2;grid-column:2;font-size:28px;text-align:right}
  .platform-grid{grid-template-columns:1fr}
  .platform-card{padding:22px}
  .security-layout{padding:20px 0;align-items:flex-start;flex-direction:column;gap:16px}
  .support-links{width:100%;justify-content:space-between}
  .download-footer .download-shell{flex-direction:column;gap:7px}
}
@media(max-width:390px){
  .download-brand strong{font-size:18px}
  .download-header nav a{font-size:12px}
  .download-header nav a:nth-child(2){display:none}
  .download-intro h1{font-size:29px}
  .release-meta dd{font-size:13px}
}
@media(prefers-reduced-motion:reduce){.download-action{transition:none}}