:root{--ink:#163a2d;--muted:#688076;--green:#367b59;--green-dark:#246044;--mint:#e7f1e7;--line:#d8e5da;--paper:#f6f9f3;--white:#fff;--shadow:0 18px 45px rgba(30,75,50,.08)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:radial-gradient(circle at 15% 0,#eaf4e8 0,transparent 31rem),var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
a{color:inherit}
header,main,footer{max-width:1180px;margin:0 auto}
header{height:76px;display:flex;align-items:center;justify-content:flex-start;border-bottom:1px solid var(--line)}
.brand{text-decoration:none;display:flex;gap:12px;align-items:center;font-size:28px;font-weight:700;letter-spacing:-.3px}
.mark{display:block;flex-shrink:0;width:56px;height:56px;object-fit:contain;border-radius:11px;box-shadow:0 5px 14px rgba(22,58,45,.18)}
.hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(310px,.85fr);gap:72px;align-items:center;padding:52px 0 48px;position:relative}
.hero-copy,.hero-flow{min-width:0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0;padding:7px 12px;border-radius:999px;background:var(--mint);color:var(--green-dark);font-size:13px;letter-spacing:2px}
h1{max-width:690px;font-size:clamp(42px,6vw,72px);letter-spacing:-3px;line-height:1.16;margin:21px 0 26px;font-weight:720}
.intro{max-width:650px;line-height:1.9;color:var(--muted);font-size:17px;margin:0}
.jump{display:inline-flex;align-items:center;justify-content:space-between;min-width:188px;gap:35px;padding:14px 18px 14px 22px;border-radius:10px;background:var(--green);color:white;text-decoration:none;margin:26px 0 0;font-weight:650;box-shadow:0 10px 22px rgba(54,123,89,.18);transition:transform .2s,background .2s}
.jump:hover{background:var(--green-dark);transform:translateY(-2px)}
.kefu{display:flex;gap:20px;align-items:center;padding:20px 22px;border:1px solid var(--line);border-radius:16px;background:var(--white);box-shadow:0 10px 28px rgba(30,75,50,.08);margin-bottom:14px}
.kefu img{display:block;flex-shrink:0;width:132px;height:132px;border-radius:8px}
.kefu-tag{display:inline-block;margin:0 0 9px;padding:4px 10px;border-radius:999px;background:#fff3d6;color:#8a5a00;font-size:12px;font-weight:650}
.kefu strong{display:block;font-size:21px;letter-spacing:-.3px}
.kefu p:last-child{margin:8px 0 0;font-size:14px;line-height:1.7;color:var(--muted)}
.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.flow>div{padding:14px 14px 13px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.86);box-shadow:0 10px 28px rgba(30,75,50,.06);position:relative}
.flow>div:before{content:"";display:block;width:22px;height:3px;border-radius:999px;background:#9ac39e;margin-bottom:9px}
.flow span{display:block;font-size:12px;color:#77a481;margin-bottom:3px;font-variant-numeric:tabular-nums}
.flow strong{font-size:15px}
.flow p{font-size:12px;color:var(--muted);margin:5px 0 0}
h2{font-size:28px;font-weight:680;letter-spacing:-.7px;margin:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.downloads{padding:14px 0 0}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{border:1px solid var(--line);background:var(--white);border-radius:18px;padding:27px 25px 23px;display:flex;flex-direction:column;min-height:278px;box-shadow:0 8px 25px rgba(30,75,50,.04);position:relative;overflow:hidden;transition:transform .2s,box-shadow .2s}
.card:before{content:"";position:absolute;inset:0 0 auto;height:5px;background:linear-gradient(90deg,#76ae7d,#c7ddbd)}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card .os{font-size:30px;font-weight:650;letter-spacing:-1px;margin:0 0 7px;padding-top:6px}
.card .chip{font-size:14px;color:var(--muted);margin:0 0 22px}
.card .version{font-size:13px;line-height:1.7;color:var(--muted);min-height:46px;white-space:pre-line}
.download{display:block;margin-top:auto;text-align:center;padding:13px 6px;border-radius:9px;background:var(--green);color:white;text-decoration:none;font-size:15px;font-weight:650;transition:background .2s}
.download:hover{background:var(--green-dark)}
.unavailable{background:#edf1ed;color:#829083;cursor:not-allowed}
.checksum{margin-top:16px;font-size:12px;color:var(--muted)}
.checksum summary{cursor:pointer}
.checksum code{display:block;overflow-wrap:anywhere;line-height:1.8;margin-top:9px}
.guide{padding:58px 0 22px}
.guide ol{list-style:none;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:38px;margin:27px 0 0}
.guide li{display:flex;gap:15px}
.guide li>span{font-size:13px;display:grid;place-items:center;flex-shrink:0;width:29px;height:29px;border:1px solid #b7cbb3;border-radius:50%;margin-top:3px;color:var(--green-dark)}
h3{font-size:17px;margin:4px 0 12px;font-weight:650}
.guide p,.details p{font-size:14px;line-height:1.9;color:var(--muted);margin:0}
.details{display:grid;grid-template-columns:repeat(3,1fr);gap:42px;padding:38px 0 68px;border-bottom:1px solid var(--line)}
footer{padding:27px 0 42px;font-size:13px;color:var(--muted);display:flex;justify-content:space-between}
.key-ok{margin:0 0 14px;padding:11px 16px;border-radius:10px;background:var(--mint);color:var(--green-dark);font-size:14px;font-weight:600}
.key-dialog{width:min(440px,calc(100vw - 32px));padding:0;border:0;border-radius:18px;color:var(--ink);background:var(--white);box-shadow:0 30px 80px rgba(22,58,45,.28)}
.key-dialog::backdrop{background:rgba(22,40,32,.45)}
.key-dialog form{padding:24px 24px 20px}
.key-dialog h2{font-size:22px;letter-spacing:-.3px}
.key-body{display:flex;gap:16px;align-items:center;margin:16px 0 18px}
.key-body img{flex-shrink:0;width:112px;height:112px;border-radius:6px;border:1px solid var(--line)}
.key-body p{margin:0;font-size:14px;line-height:1.8}
.key-body span{color:var(--muted);font-size:12px}
.key-dialog input{width:100%;padding:12px 14px;border:1px solid #b9cdb9;border-radius:10px;font:inherit;font-size:17px;letter-spacing:1px;color:var(--ink);background:#fbfdfa}
.key-dialog input:focus{outline:3px solid #b9d6b3;border-color:var(--green)}
.key-error{min-height:20px;margin:8px 0 4px;font-size:13px;color:#b42318}
.key-actions{display:flex;justify-content:flex-end;gap:10px}
.key-actions button{padding:11px 18px;border-radius:9px;border:1px solid var(--line);font:inherit;font-size:15px;font-weight:650;cursor:pointer}
.key-cancel{background:var(--white);color:var(--muted)}
.key-submit{background:var(--green);border-color:var(--green)!important;color:white}
.key-submit:disabled{opacity:.6;cursor:wait}
button,a,summary{touch-action:manipulation}
a:focus-visible,summary:focus-visible{outline:3px solid #86a86b;outline-offset:4px}
@media(max-width:1240px){header,main,footer{margin-left:30px;margin-right:30px}}
@media(max-width:760px){header{height:72px}.mark{width:48px;height:48px}.hero{grid-template-columns:1fr;gap:34px;padding-top:54px}.flow>div{padding:12px}.flow strong{font-size:14px}.kefu{padding:16px}.kefu img{width:112px;height:112px}.kefu strong{font-size:18px}.cards,.guide ol,.details{grid-template-columns:1fr}.card{min-height:245px;padding:24px 21px}.guide ol{gap:25px}.details{gap:25px;padding-top:24px}.guide{padding-top:54px}footer{display:block}footer span{display:block;margin-top:12px}.brand{font-size:22px}.intro{font-size:15px}h1{font-size:clamp(39px,12vw,58px);letter-spacing:-2px}}