:root{color-scheme:light;--orange:#ff6908;--ink:#20211f;--muted:#696b68;--line:#e8e5e0;--warm:#fff8f2}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:30px}
body{margin:0;background:#fff;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
button,a{-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
button:focus-visible,a:focus-visible{outline:3px solid #c64f00;outline-offset:5px}
[hidden]{display:none!important}
.skip-link{position:absolute;left:20px;top:-80px;z-index:5;background:#fff;padding:12px}
.skip-link:focus{top:10px}
.page-header{height:72px;border-bottom:1px solid var(--orange);background:#fffcf9}
.header-inner{max-width:1424px;height:100%;margin:auto;padding:0 40px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-size:26px;font-weight:800;white-space:nowrap}
.brand img{object-fit:contain}
.header-inner nav{display:flex;align-items:center;gap:30px;font-weight:650;font-size:16px}
.contact-button{border:1px solid var(--orange);border-radius:12px;color:#e75b00;background:#fff;padding:9px 19px;font-weight:650}
.home-link:hover{color:var(--orange)}
.contact-button:hover{background:var(--warm)}
.hero{text-align:center;padding:34px 20px 0;background:#fffaf6}
.windows-mark{display:block;margin:0 auto 16px}
h1{margin:0;font-size:clamp(32px,4.2vw,58px);line-height:1.3;letter-spacing:-1.8px;font-weight:800}
.hero-description{color:var(--muted);font-size:25px;line-height:1.6;margin:12px 0 25px}
.download-button{display:inline-flex;justify-content:center;align-items:center;gap:16px;min-height:64px;min-width:420px;padding:14px 30px;border-radius:16px;background:var(--orange);color:#fff;font-size:27px;font-weight:750;transition:background .15s,transform .15s}
.download-button:hover{background:#eb5e00;transform:translateY(-1px)}
.download-button:active{transform:translateY(0)}
.system-requirements{margin:12px 0 0;padding-bottom:22px;color:var(--muted);font-size:17px;line-height:1.6}
.system-requirements span{padding:0 8px}
.download-status,.noscript-note{max-width:560px;margin:0 auto;padding:0 0 18px;color:var(--muted);font-size:14px;line-height:1.7}
.instructions{max-width:1464px;margin:auto;padding:0 40px 36px}
.journey{max-width:940px;margin:26px auto 12px;display:flex;align-items:center;gap:28px}
.journey-step{display:flex;align-items:center;gap:15px;white-space:nowrap;font-size:23px;font-weight:700}
.journey-step>span{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border:1.5px solid var(--orange);border-radius:50%;color:var(--orange);font-size:23px;font-weight:500}
.journey-step.current>span{background:var(--orange);color:#fff}
.journey-step:hover{color:var(--orange)}
.journey-line{flex:1;height:1px;background:#ffad78}
.guide-intro{text-align:center;color:var(--muted);font-size:18px;margin:0 0 30px;line-height:1.6}
.guide-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:30px}
.guide{min-width:0;scroll-margin-top:26px}
.guide+.guide{border-left:1px solid var(--line);padding-left:30px}
.guide h2{font-size:clamp(21px,2vw,29px);line-height:1.4;letter-spacing:-.9px;margin:0 0 10px;font-weight:800}
.guide-description{font-size:14px;line-height:1.8;color:var(--muted);margin:0 0 18px;min-height:50px}
.illustration-label{font-size:15px;font-weight:700;margin:0 0 10px}
.diagram-labels{list-style:none;display:grid;gap:12px;padding:0;margin:0 0 8px}
.edge-labels{grid-template-columns:repeat(3,minmax(0,1fr))}
.run-labels{grid-template-columns:repeat(2,minmax(0,1fr))}
.diagram-labels li{display:flex;align-items:center;justify-content:center;gap:5px;color:#e55c00;font-weight:700;font-size:14px;background:#fff2e8;border-radius:20px;padding:5px 0;white-space:nowrap}
.diagram-labels li>span{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;width:20px;height:20px;border-radius:50%;background:var(--orange);color:#fff;font-size:13px}
.diagram-button{display:block;border:0;padding:0;width:100%;background:#fff;cursor:zoom-in;border-radius:8px}
.guide-image{display:block;width:100%;height:300px;object-fit:contain}
.action-trail{display:table;max-width:100%;margin:16px auto 8px;padding:8px 20px;border-radius:28px;background:#fff3e9;color:#e75b00;font-size:18px;line-height:1.5;font-weight:700;text-align:center}
.action-trail>span{padding:0 5px}
.keyboard-tip{margin:7px 0 0;text-align:center;color:var(--muted);font-size:15px;line-height:1.8}
kbd{font-family:inherit;background:#f4f4f3;border:1px solid #dededb;box-shadow:0 1px 0 #dededb;border-radius:4px;padding:1px 5px}
dialog{border:1px solid var(--line);border-radius:18px;color:var(--ink);box-shadow:0 22px 90px #0003}
dialog::backdrop{background:#15171399}
.dialog-close{display:block;margin-left:auto;border:0;background:#f3f1ee;border-radius:7px;padding:7px 13px}
.contact-dialog{width:min(390px,calc(100% - 32px));padding:18px 24px 24px;text-align:center}
.contact-dialog h2{font-size:23px;margin:10px 0 20px}
.contact-dialog>img{display:block;max-width:100%;height:auto;margin:auto}
.contact-dialog p{font-size:15px;color:var(--muted)}
.image-dialog{width:min(1300px,calc(100% - 24px));max-width:none;padding:12px}
.image-scroll{overflow:auto}
.image-scroll img{display:block;width:100%;height:auto;min-width:760px}
@media(min-width:1500px){.guide-image{height:320px}.hero{padding-top:38px}}
@media(max-width:1100px){.header-inner,.instructions{padding-left:25px;padding-right:25px}.journey{max-width:800px}.journey-step{font-size:20px}.guide-grid{gap:20px}.guide+.guide{padding-left:20px}.guide h2{font-size:22px}.diagram-labels li{font-size:11px;gap:3px}.diagram-labels{gap:5px}.guide-image{height:250px}.action-trail{font-size:15px;padding:7px 12px}.action-trail>span{padding:0 2px}}
@media(max-width:760px){.page-header{height:66px}.header-inner{padding:0 20px}.brand{font-size:22px;gap:5px}.brand img{width:42px;height:42px}.header-inner nav{gap:16px;font-size:14px}.contact-button{padding:7px 12px;border-radius:9px}.hero{padding:32px 20px 0}h1{font-size:34px;letter-spacing:-1px}.hero-description{font-size:19px;margin:13px 0 23px}.download-button{min-width:0;width:min(100%,380px);min-height:59px;font-size:23px;gap:12px;border-radius:13px}.system-requirements{font-size:15px;padding-bottom:24px}.instructions{padding:0 20px 30px}.journey{gap:12px;margin-top:25px}.journey-step{font-size:16px;gap:7px}.journey-step>span{width:30px;height:30px;font-size:18px}.guide-intro{font-size:15px;margin-bottom:28px}.guide-grid{grid-template-columns:1fr;gap:32px}.guide+.guide{padding:28px 0 0;border-left:0;border-top:1px solid var(--line)}.guide h2{font-size:24px;letter-spacing:-.5px}.guide-description{min-height:0;font-size:14px}.diagram-labels li{font-size:12px}.diagram-labels li>span{width:18px;height:18px;font-size:12px}.guide-image{height:auto;max-height:400px}.action-trail{margin-top:14px;font-size:15px}.keyboard-tip{font-size:13px}}
@media(max-width:380px){.header-inner nav{gap:10px}.contact-button{padding:6px 9px}.brand{font-size:20px}.brand img{width:36px;height:36px}h1{font-size:30px}.journey{gap:7px}.journey-step{font-size:14px;gap:5px}.journey-step>span{width:27px;height:27px}.diagram-labels li{font-size:10px}.action-trail{font-size:13px;padding:8px}.guide h2{font-size:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.download-button{transition:none}}
@media(max-width:760px){h1>span{display:block}}
@media(min-width:761px){.hero{padding-top:24px}.windows-mark{margin-bottom:8px}h1{font-size:54px;line-height:1.15}.hero-description{font-size:24px;line-height:1.4;margin:6px 0 16px}.download-button{min-height:62px}.system-requirements{padding-bottom:12px}.journey{margin-top:20px}.guide-intro{margin-bottom:24px}.guide-description{min-height:28px;margin-bottom:12px}.guide-image{height:290px}}