:root{--ink:#e9edf5;--muted:#9aa6b6;--paper:#101419;--surface:#171d24;--surface-2:#1e2732;--line:#2d3947;--mint:#19c6a4;--mint-dark:#062d2b;--orange:#ff7b24}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Microsoft YaHei",Arial,sans-serif;line-height:1.55}.topbar{height:66px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1180px)/2));position:sticky;top:0;background:#101419ee;backdrop-filter:blur(14px);z-index:4}.brand{color:#fff;text-decoration:none;font-weight:700;font-size:19px}.brand span{color:var(--mint);font-weight:500;margin-left:5px}.top-actions{display:flex;gap:16px;align-items:center}.offline{font-size:13px;color:var(--muted);display:flex;gap:7px;align-items:center}.offline i{width:8px;height:8px;background:var(--mint);border-radius:50%;box-shadow:0 0 0 4px #19c6a423}.language{background:transparent;border:1px solid var(--line);color:var(--ink);padding:6px 10px;border-radius:4px;font-weight:700;cursor:pointer}main{width:min(1180px,calc(100% - 40px));margin:0 auto;padding:70px 0 100px}.intro{max-width:780px}.eyebrow,.section-kicker{color:var(--mint);font-size:13px;font-weight:700;letter-spacing:0;margin:0 0 8px}.intro h1{font-size:42px;line-height:1.12;letter-spacing:0;margin:0 0 16px}.lede{font-size:18px;color:var(--muted);margin:0}.notice{margin-top:23px;border-left:3px solid var(--orange);padding:8px 12px;color:#c9d1dc;background:#221c18;font-size:14px}.platform-picker{display:flex;justify-content:space-between;gap:20px;align-items:end;margin:56px 0 26px;border-bottom:1px solid var(--line);padding-bottom:22px}.platform-picker h2{font-size:23px;margin:0}.platform-buttons{display:flex;gap:8px}.platform{height:42px;background:transparent;color:var(--muted);border:1px solid var(--line);border-radius:5px;padding:0 18px;cursor:pointer;font-weight:700}.platform.active{border-color:var(--mint);background:var(--mint-dark);color:#e7fffa}.platform-icon{margin-right:7px;font-size:18px}.progress{display:grid;grid-template-columns:auto 1fr auto 1fr auto 1fr auto;align-items:center;margin:0 0 26px}.progress i{height:1px;background:var(--line)}.progress-item{border:0;background:transparent;color:var(--muted);display:flex;align-items:center;gap:8px;padding:7px 0;cursor:pointer}.progress-item span{width:25px;height:25px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;font-size:12px}.progress-item.active{color:#fff}.progress-item.active span{background:var(--mint);border-color:var(--mint);color:#062a28}.step-card{border:1px solid var(--line);margin-top:12px;background:var(--surface)}.step-title{display:flex;align-items:center;gap:18px;padding:22px 25px}.step-title>span{font-size:14px;color:var(--mint);font-weight:700;border:1px solid #1c5e55;padding:3px 7px}.step-title p{font-size:12px;color:var(--muted);margin:0 0 2px}.step-title h2{margin:0;font-size:21px}.step-content{display:none;border-top:1px solid var(--line);padding:27px 25px 29px}.step-card.active .step-content{display:block}.step-content>p,.copy{color:#bdc7d3;margin-top:0}.downloads{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:23px 0}.download-card{background:var(--surface-2);border:1px solid var(--line);padding:20px}.app-label{color:var(--mint);font-weight:700;font-size:13px;margin:0}.download-card h3{font-size:18px;margin:3px 0 15px}.system-option{display:grid;gap:8px}.primary-link,.secondary-link,.official-link{display:inline-flex;align-items:center;text-decoration:none;border-radius:4px;font-size:14px;font-weight:700}.primary-link{background:var(--mint);color:#07312d;padding:10px 13px;width:max-content}.secondary-link{color:#dfe8f4;padding:7px 0}.official-link{color:#91bcff;margin-top:15px}.macos-only{display:none}.callout{display:flex;gap:12px;border-left:3px solid var(--mint);background:#122522;padding:12px 14px;color:#bad8d3;font-size:14px}.callout strong{color:#e7fffa;white-space:nowrap}.caution{border-color:var(--orange);background:#271d16;color:#dfc5af;margin-top:18px}.caution strong{color:#ffca9d}.next-step{margin-top:23px;background:var(--mint);border:0;color:#062e2b;font-weight:800;border-radius:4px;padding:11px 16px;cursor:pointer}.split{display:grid;grid-template-columns:minmax(260px,.85fr) minmax(390px,1.15fr);gap:25px}.split>.next-step{grid-column:1/-1;width:max-content;margin-top:0}.copy ol,.final-step ol{padding-left:20px;margin:0}.copy li,.final-step li{margin:0 0 12px}.image-stack{display:grid;gap:12px;max-height:660px;overflow:auto;background:#0d1116;padding:10px}.image-stack img{display:block;max-width:100%;height:auto;border:1px solid #303a45}.prompt{background:#090d11;border:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:14px 15px;margin:18px 0}.prompt code{color:#dffdf6;font-size:16px}.copy{border:1px solid #376c64;background:#103b35;color:#b9fff1;border-radius:3px;padding:6px 10px;cursor:pointer}.expected{border:1px dashed #405160;padding:13px;display:grid;gap:5px;max-width:570px;font-size:13px;color:var(--muted)}.expected code{color:#fff}.completion{display:flex;gap:14px;align-items:flex-start;margin-top:26px;padding:17px;background:#102824;border:1px solid #21675d}.completion>span{background:var(--mint);color:#05322d;border-radius:50%;width:24px;height:24px;display:grid;place-items:center;font-weight:800}.completion b{color:#e8fff9}.completion p{margin:2px 0 0;color:#b8dad4;font-size:14px}@media(max-width:720px){.topbar{padding:0 20px}main{width:min(100% - 28px,1180px);padding-top:42px}.intro h1{font-size:33px}.platform-picker{align-items:flex-start;flex-direction:column;margin-top:42px}.progress{grid-template-columns:auto 1fr auto 1fr auto 1fr auto;overflow:hidden}.progress-item b{display:none}.downloads,.split{grid-template-columns:1fr}.step-title,.step-content{padding-left:17px;padding-right:17px}.split>.next-step{grid-column:auto}.offline{display:none}.image-stack{max-height:460px}.primary-link{width:100%}}