:root{color:#17211d;background:#f3f4ef;font-family:"Avenir Next","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none;--ink:#17211d;--muted:#69756f;--line:#dce1da;--paper:#fffefa;--blue:#2b6de5;--blue-dark:#1f5fcb;--blue-soft:#e7f0ff}*{box-sizing:border-box}html{min-width:20rem;background:#f3f4ef}body{min-height:100vh;margin:0;background:radial-gradient(circle at 12% 8%,rgba(132,174,255,.22),transparent 24rem),radial-gradient(circle at 88% 38%,rgba(208,218,211,.4),transparent 30rem),#f3f4ef}body:has(dialog[open]){overflow:hidden}a{color:inherit}button{font:inherit}main{width:min(100% - 2rem,76rem);margin:0 auto;padding:1.2rem 0 2.4rem}.site-header{display:flex;align-items:center;justify-content:space-between;padding:.9rem .2rem 2.6rem}.brand{display:flex;gap:.72rem;align-items:center;color:var(--ink);font-weight:780;text-decoration:none;letter-spacing:-.01em}.brand img{width:2.35rem;height:2.35rem;border-radius:.74rem;box-shadow:0 .45rem 1.2rem rgba(32,45,39,.12)}.header-note{color:var(--muted);font-size:.78rem;letter-spacing:.08em}.hero{width:100%;padding:.7rem .2rem 2.3rem}.eyebrow{margin:0 0 .8rem;color:var(--blue);font-size:.72rem;font-weight:820;letter-spacing:.16em}h1{max-width:none;margin:0;white-space:nowrap;font-family:"Iowan Old Style","Songti SC",serif;font-size:clamp(2.8rem,7vw,5.5rem);font-weight:620;line-height:.98;letter-spacing:-.055em}.hero-copy{max-width:40rem;margin:1.35rem 0 0;color:var(--muted);font-size:clamp(.95rem,2vw,1.08rem);line-height:1.75}.channel-switch{display:inline-flex;gap:.25rem;margin-top:1.6rem;border:1px solid var(--line);border-radius:.82rem;padding:.24rem;background:rgba(255,254,250,.74)}.channel-switch a{min-width:7.1rem;border-radius:.62rem;padding:.62rem .9rem;color:var(--muted);font-size:.82rem;font-weight:760;text-align:center;text-decoration:none;transition:background 140ms ease,color 140ms ease,box-shadow 140ms ease}.channel-switch a:hover{color:var(--blue);background:#f4f7fd}.channel-switch a.active{color:white;background:var(--blue);box-shadow:0 .3rem .85rem rgba(43,109,229,.22)}.current-channel{margin:.7rem 0 0;color:#8b9590;font-size:.76rem}.service-notice{margin:0 0 1rem;border:1px solid #e7d39e;border-radius:.9rem;padding:.85rem 1rem;color:#795a19;background:#fff9e8}.download-grid{display:grid;gap:1rem;grid-template-columns:repeat(2,minmax(0,1fr))}.download-card{display:flex;min-height:23.5rem;flex-direction:column;border:1px solid rgba(212,219,211,.95);border-radius:1.45rem;padding:clamp(1.35rem,3vw,2rem);background:rgba(255,254,250,.94);box-shadow:0 1.6rem 4.8rem rgba(32,45,39,.08);backdrop-filter:blur(18px)}.platform-heading{display:flex;gap:1rem;align-items:center}.platform-icon{display:grid;width:3.35rem;height:3.35rem;flex:0 0 auto;border-radius:1rem;color:#174baf;background:var(--blue-soft);place-items:center}.platform-icon svg{width:1.55rem;height:1.55rem;fill:currentColor}.platform-label{margin:0 0 .18rem;color:var(--blue);font-size:.68rem;font-weight:820;letter-spacing:.14em;text-transform:uppercase}h2{margin:0;font-family:"Iowan Old Style","Songti SC",serif;font-size:clamp(1.35rem,3vw,1.8rem);font-weight:650;letter-spacing:-.025em}.platform-detail{min-height:3.6rem;margin:1.35rem 0 0;color:var(--muted);font-size:.9rem;line-height:1.65}.version-row{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center;margin-top:1.45rem}.version-row strong{font-size:1.15rem;letter-spacing:-.02em}.channel-badge{display:inline-flex;margin-left:.7rem;border:1px solid #bfd0f0;border-radius:99px;padding:.25rem .55rem;color:#285fae;background:#f3f7ff;font-size:.68rem;font-weight:760}.history-button{width:max-content;margin:.85rem 0 0;border:0;padding:0;color:var(--blue);background:transparent;font-size:.8rem;font-weight:760;cursor:pointer}.history-button:hover{color:var(--blue-dark)}.release-meta{display:flex;gap:.8rem;justify-content:space-between;margin-top:auto;border-top:1px solid #e9ece6;padding-top:1rem;color:#7d8882;font-size:.73rem}.download-button{display:flex;min-height:3rem;align-items:center;justify-content:center;margin-top:1rem;border:1px solid transparent;border-radius:.78rem;color:white;background:var(--blue);box-shadow:0 .55rem 1.25rem rgba(43,109,229,.2);font-size:.9rem;font-weight:780;text-decoration:none;transition:transform 120ms ease,background 120ms ease}.download-button:hover{background:var(--blue-dark);transform:translateY(-1px)}.download-button:focus-visible,.channel-switch a:focus-visible,.brand:focus-visible,.history-button:focus-visible,.dialog-close:focus-visible{outline:3px solid rgba(43,109,229,.32);outline-offset:3px}.download-button.disabled{color:#8b9590;border-color:#d9ded8;background:#eef0ec;box-shadow:none;pointer-events:none}.unavailable-card{box-shadow:none}.history-dialog{width:min(100% - 2rem,47rem);max-height:min(82vh,50rem);border:0;border-radius:1.4rem;padding:0;color:var(--ink);background:var(--paper);box-shadow:0 2rem 7rem rgba(25,34,30,.26)}.history-dialog::backdrop{background:rgba(23,33,29,.34);backdrop-filter:blur(6px)}.dialog-header{position:sticky;z-index:1;top:0;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:1.25rem 1.5rem;background:rgba(255,254,250,.96)}.dialog-header h3{margin:0;font-family:"Iowan Old Style","Songti SC",serif;font-size:1.55rem}.dialog-close{display:grid;width:2.3rem;height:2.3rem;border:0;border-radius:.75rem;color:#5f6a65;background:#eef1ec;font-size:1.5rem;line-height:1;cursor:pointer;place-items:center}.dialog-close:hover{color:var(--blue-dark);background:var(--blue-soft)}.dialog-intro{margin:0;padding:1.1rem 1.5rem 0;color:var(--muted);font-size:.82rem;line-height:1.6}.history-list{padding:.4rem 1.5rem 1.5rem}.history-release{border-bottom:1px solid #e9ece6;padding:1.25rem 0}.history-release:last-child{border-bottom:0}.history-release-heading{display:flex;gap:1rem;align-items:center;justify-content:space-between}.history-release-heading strong{font-size:1rem}.history-release-heading time{flex:0 0 auto;color:#818b86;font-size:.72rem}.history-notes{margin-top:.8rem;color:#4f5c56;font-size:.84rem;line-height:1.7}.history-notes h4{margin:.85rem 0 .3rem;color:#315b94;font-size:.82rem}.history-notes h4:first-child{margin-top:0}.history-notes p{margin:.35rem 0}.history-notes ul{margin:.35rem 0;padding-left:1.2rem}.history-empty{margin:1rem 0 0;color:var(--muted)}.trust-strip{display:grid;gap:1rem;grid-template-columns:repeat(3,1fr);margin-top:1rem;border:1px solid var(--line);border-radius:1.2rem;padding:1.25rem;background:rgba(255,254,250,.62)}.trust-strip>div{display:grid;gap:.7rem;grid-template-columns:auto 1fr}.trust-number{color:var(--blue);font-size:.7rem;font-weight:850;letter-spacing:.1em}.trust-strip p{margin:0;color:var(--muted);font-size:.78rem;line-height:1.55}.trust-strip strong{color:var(--ink);font-size:.82rem}footer{display:flex;justify-content:space-between;padding:1.4rem .2rem 0;color:#8a948f;font-size:.7rem}@media(max-width:720px){main{width:min(100% - 1.1rem,76rem);padding-top:.65rem}.site-header{padding-bottom:1.8rem}.header-note{display:none}.hero{padding-bottom:1.7rem}h1{white-space:normal;font-size:clamp(2.6rem,14vw,4.2rem)}.download-grid,.trust-strip{grid-template-columns:1fr}.download-card{min-height:22rem}.trust-strip{padding:1rem}.history-dialog{width:min(100% - 1rem,47rem)}.dialog-header,.history-list{padding-left:1rem;padding-right:1rem}.dialog-intro{padding-left:1rem;padding-right:1rem}footer{gap:.5rem;flex-direction:column}}
/* Spacious editorial rhythm for the public download page. */
body{background:radial-gradient(circle at 88% 20%,rgba(207,216,209,.38),transparent 34rem),linear-gradient(180deg,#f7f7f3 0%,#f3f4ef 58%,#eef0eb 100%)}
main{width:min(100% - 2rem,82rem);padding-top:1.45rem}
.site-header,.hero,.download-grid,.trust-strip,footer{width:min(100%,72rem);margin-left:auto;margin-right:auto}
.site-header{padding:1rem .2rem 4.2rem}
.hero{padding:.55rem .2rem 4.65rem}
h1{letter-spacing:-.045em}
.hero-copy{margin-top:1.65rem}
.channel-switch{margin-top:2rem}
.download-grid{gap:1.3rem}
.download-card{min-height:26.5rem;border-radius:1.6rem;padding:clamp(1.7rem,3vw,2.2rem);box-shadow:0 1.8rem 4.6rem rgba(32,45,39,.075)}
.platform-detail{min-height:4rem;margin-top:1.55rem}
.version-row{margin-top:2.05rem}
.history-button{margin-top:1rem}
.release-meta{padding-top:1.1rem}
.trust-strip{margin-top:1.3rem}
@media(max-width:720px){main{width:min(100% - 1.1rem,82rem)}.site-header,.hero,.download-grid,.trust-strip,footer{width:100%}.site-header{padding-bottom:2.2rem}.hero{padding-bottom:2.7rem}.download-card{min-height:23.5rem}}