:root{--paper:#ffffff;--ink:#1f2937;--muted:#6b7280;--line:#e5e7eb;--primary:#338fe2;--accent:#185d99}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
button:disabled{opacity:.35;cursor:default}
h1,h2,p,figure{margin:0}
a:hover{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
[tabindex="-1"]:focus{outline:none}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
.skip-link{position:absolute;top:-80px;left:15px;z-index:40;padding:12px;background:var(--primary)}
.skip-link:focus{top:10px}
.site-header{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 40px;border-bottom:1px solid #282249;background:#1b173d;color:#fff;position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:9px;line-height:1;white-space:nowrap}
.brand img{display:block;width:100px;height:28px;object-fit:contain}
.brand-title{font-size:18px;font-weight:700;letter-spacing:.5px;color:#f2f1f8}
.product-badge{margin-left:5px;padding:8px 10px;background:#e7f2ff;color:#185d99;font-size:12px;border-radius:5px}
.site-header nav{display:flex;align-items:center;gap:30px;font-size:13px}
.site-header nav a{border:1px solid #514b6c;border-radius:6px;padding:8px 16px}
.nav-current{font-weight:600;color:#d5e8ff}
.site-header a:hover{color:#fff}
.site-header nav a:hover{background:#332d53}
.manual-shell{display:grid;grid-template-columns:264px minmax(0,1fr);max-width:1780px;margin:auto}
.sidebar{position:sticky;top:64px;height:calc(100dvh - 64px);overflow:auto;border-right:1px solid var(--line);padding:28px 20px;background:#f3f4f6;scrollbar-width:thin}
.eyebrow{font-size:10px;letter-spacing:1.5px;font-weight:600;color:var(--muted)}
.side-heading h2{font-size:16px;letter-spacing:-.4px;margin:7px 0 25px}
.outline-group{margin:0 0 13px}
.outline-group summary{list-style:none;cursor:pointer;font-size:13px;font-weight:650;display:flex;gap:10px;align-items:center;padding:8px 4px}
.outline-group summary::-webkit-details-marker{display:none}
.stage-index{font-size:10px;color:#7c8596;font-weight:500}
.stage-count{margin-left:auto;font-size:10px;color:var(--muted);font-weight:400}
.outline-items{display:grid;gap:3px}
.outline-items a{display:flex;align-items:center;gap:10px;padding:7px 10px;font-size:12px;border-radius:6px}
.outline-items a:hover{background:#e9eef5}
.outline-items a.active{background:#e0edfc;font-weight:600;color:var(--accent);box-shadow:inset 3px 0 0 var(--primary)}
.outline-items a.active .outline-number{color:var(--accent)}
.outline-number{font-size:10px;color:#64748b;font-variant-numeric:tabular-nums}
.done-label{margin-left:auto;color:var(--accent)}
.progress-box{border-top:1px solid var(--line);padding-top:18px;margin-top:25px}
.progress-box>div{display:flex;justify-content:space-between;font-size:11px}
.progress-box p{font-size:11px;color:var(--muted);margin-top:10px}
progress{appearance:none;border:0;width:100%;height:4px;border-radius:4px;background:#e1e7ef;display:block;margin-top:12px}
progress::-webkit-progress-bar{background:#e1e7ef}
progress::-webkit-progress-value{background:var(--accent)}
progress::-moz-progress-bar{background:var(--accent)}
#outline-toggle{display:none}
main{min-width:0;padding:26px 36px 0;min-height:calc(100dvh - 64px)}
.workspace-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:24px}
.breadcrumb{font-size:11px;color:var(--muted)}
.breadcrumb span{margin:0 10px;color:#9ca3af}
.breadcrumb b{font-weight:500}
.guide-badge{font-size:10px;border:1px solid #dbe3ef;border-radius:30px;padding:3px 11px;white-space:nowrap;color:#64748b}
.step-banner{display:grid;grid-template-columns:minmax(230px,.72fr) minmax(0,1.4fr);background:#eef5fd;border:1px solid #dbe7f5;border-radius:15px;overflow:hidden}
.banner-copy{padding:30px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start}
.banner-copy .eyebrow{color:#185d99;margin-bottom:23px;font-size:10px}
.banner-copy h1{font-size:clamp(29px,2.9vw,49px);font-weight:750;line-height:1.24;letter-spacing:-1.6px;margin-bottom:18px}
.banner-copy>p{font-size:13px;line-height:1.9;color:#53657c;max-width:320px}
.materials{margin-top:24px;padding-top:14px;border-top:1px solid #d0dff0;width:100%;font-size:11px;color:#53657c}
.materials>span{font-size:9px;color:#64748b}
.materials p{margin-top:3px}
.banner-media{min-width:0;background:#e8eef5;display:flex;flex-direction:column;justify-content:center}
.media-frame{position:relative;aspect-ratio:16/9;background:#ddd}
.media-frame img{width:100%;height:100%;object-fit:contain;display:block}
.media-state{position:absolute;bottom:12px;left:12px;background:#ffffffeF;border-radius:4px;padding:4px 10px;font-size:10px}
.banner-media figcaption{padding:10px 14px;display:flex;align-items:center;justify-content:space-between;gap:10px;background:#f4f7fb;color:#53657c;font-size:10px}
.media-actions{display:flex;gap:12px}
.media-actions button{padding:0;background:none;border:0;font-size:11px;white-space:nowrap}
.media-actions button+button{border-left:1px solid #dbe3ef;padding-left:12px}
.step-meta{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#6b7280;border-bottom:1px solid var(--line);padding:16px 0}
.step-meta button{background:none;border:0;padding:0;font-size:11px;color:var(--accent)}
.task-content{display:grid;grid-template-columns:minmax(0,1fr) 225px;gap:38px;padding:27px 0 32px}
.task-main h2{font-size:20px;margin:3px 0 16px;letter-spacing:-.5px}
.task-main ol{list-style:none;counter-reset:operation;padding:0;margin:0;display:grid;gap:12px}
.task-main li{counter-increment:operation;position:relative;padding-left:35px;font-size:13px;line-height:1.95}
.task-main li:before{content:counter(operation,decimal-leading-zero);position:absolute;left:0;top:1px;font-size:11px;color:#7c8596}
.checkpoint{border-left:1px solid var(--line);padding-left:24px;padding-top:7px}
.checkpoint .eyebrow{font-size:9px;letter-spacing:1px}
.checkpoint h2{font-size:15px;margin:11px 0 15px}
.checkpoint p{font-size:13px;color:#53657c;line-height:1.95}
.check-hint{display:block;font-size:10px;margin-top:17px;color:#6b7280}
.callout{margin-top:22px;border-left:3px solid #338fe2;background:#eef5fd;padding:13px 16px;font-size:12px;color:#185d99;line-height:1.85}
.step-navigation{display:flex;align-items:center;gap:24px;border-top:1px solid var(--line);padding:20px 0}
.step-navigation button{border:1px solid #d1d9e5;border-radius:7px;padding:11px 18px;background:transparent;font-size:12px;min-height:45px}
.step-navigation .next-button{margin-left:auto;background:#2376c5;border-color:#2376c5;color:#fff;font-weight:600;padding:11px 23px}
.next-preview{font-size:12px;display:flex;flex-direction:column}
.next-preview span{font-size:9px;color:#6b7280}
.next-preview strong{font-weight:500}
.finish-message{background:#e7f2ff;padding:18px;color:#185d99;font-size:14px;border-radius:8px;margin:8px 0}
.finish-message a{font-weight:bold;text-decoration:underline}
footer{font-size:9px;color:#6b7280;padding:7px 0 24px}
footer span{margin:0 7px}
dialog{border:0;border-radius:12px;padding:16px;max-width:1200px;width:94vw;max-height:94dvh;background:var(--paper);color:var(--ink)}
dialog::backdrop{background:#1b173dcc}
dialog img{display:block;width:100%;max-height:75dvh;object-fit:contain;background:#edf0f5}
.dialog-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:14px}
.dialog-head button{background:none;border:1px solid var(--line);border-radius:5px;padding:6px 14px;font-size:12px}
dialog>p{text-align:center;font-size:11px;color:var(--muted);margin-top:8px}
@media(min-width:1600px){main{padding:32px 48px 0}
.banner-copy{padding:40px}
.banner-copy h1{font-size:48px}
}
@media(max-width:1150px){.manual-shell{grid-template-columns:230px minmax(0,1fr)}
main{padding:24px}
.sidebar{padding:24px 15px}
.step-banner{grid-template-columns:1fr}
.banner-copy{padding:25px;display:block}
.banner-copy h1{font-size:32px;margin:10px 0}
.banner-copy h1 br{display:none}
.banner-copy .eyebrow{margin-bottom:12px}
.banner-copy>p{max-width:none}
.materials{margin-top:14px;padding-top:10px}
.materials p{display:inline;margin-left:10px}
.task-content{grid-template-columns:minmax(0,1fr) 190px;gap:22px}
.checkpoint{padding-left:20px}
}
@media(max-width:700px){.site-header{height:64px;padding:0 16px}
.brand{gap:7px}
.brand img{width:78px;height:auto}
.brand-title{font-size:15px}
.product-badge{display:none}
.site-header nav{gap:0;font-size:11px}
.nav-current{display:none}
.site-header nav a{padding:6px 10px}
.manual-shell{display:block}
.sidebar{position:relative;top:0;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:17px 20px;overflow:visible}
.side-heading{position:relative}
.side-heading h2{font-size:15px;margin:3px 0 0}
.side-heading .eyebrow{font-size:9px}
#outline-toggle{display:block;position:absolute;right:0;top:12px;border:0;background:none;font-size:11px;padding:5px 0 5px 12px}
#outline-toggle span{margin-left:5px}
#outline-content{display:none;padding-top:22px}
.sidebar.expanded #outline-content{display:block}
.outline-items a{padding:10px;font-size:13px}
.progress-box{margin-top:15px}
main{padding:21px 20px 0;min-height:auto}
.workspace-top{margin-bottom:18px}
.breadcrumb{font-size:10px}
.breadcrumb span{margin:0 5px}
.guide-badge{font-size:9px;padding:2px 7px}
.banner-copy{padding:24px}
.banner-copy h1{font-size:32px}
.banner-copy>p{font-size:13px}
.banner-media figcaption{padding:10px;font-size:9px}
.media-actions{gap:10px}
.task-content{display:block;padding:24px 0}
.task-main li{font-size:14px}
.checkpoint{padding:18px 20px;background:#f3f6fb;border:0;border-radius:8px;margin-top:24px}
.checkpoint h2{margin:6px 0 10px}
.check-hint{margin-top:10px}
.step-navigation{gap:10px;position:sticky;bottom:0;background:var(--paper);z-index:5;padding:15px 0}
.next-preview{display:none}
.step-navigation button{padding:11px 15px}
.step-navigation .next-button{padding:11px 18px}
footer{font-size:8px;padding-top:10px}
dialog{padding:10px}
.dialog-head{font-size:12px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}
}

@media(max-width:700px){.banner-copy h1 br{display:block}
}