:root{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:#263e3c;background:#f4f3ec;font-synthesis:none;--green:#315f59;--muted:#6f7b74;--line:#d9ddd2;--gold:#b97434}*{box-sizing:border-box}body{margin:0}button,a,input{touch-action:manipulation}button{font:inherit;cursor:pointer;color:inherit;border:1px solid var(--line);background:#f8f8f1;border-radius:7px;padding:8px 13px}button:hover{background:#e6ece3;border-color:#9daa99}button.active,button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #bf873d;outline-offset:3px}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}[hidden]{display:none!important}header{max-width:1640px;margin:auto;padding:24px 36px 19px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{font-size:20px;font-weight:700;letter-spacing:2px}.brand span{font-size:11px;font-weight:400;display:block;letter-spacing:3px;margin-top:5px;color:var(--muted)}.back-link{font-size:13px}main{max-width:1640px;margin:auto;padding:30px 36px 0}.intro{display:flex;justify-content:space-between;gap:30px;align-items:flex-end;margin-bottom:27px}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:600;color:#747e68;margin:0 0 12px}h1{font-family:Georgia,"Noto Serif SC","SimSun",serif;font-size:37px;letter-spacing:1px;font-weight:500;margin:0}h2{font-size:23px;margin:0 0 14px;font-weight:600}h3{font-size:14px;margin:0 0 12px}p{font-size:14px;line-height:1.85;margin:0 0 14px}.intro>p{color:var(--muted);font-size:13px;margin:0}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 342px;border:1px solid #cdd5c7;border-radius:13px;overflow:hidden;background:#fffef8}.scene{height:660px;position:relative;overflow:hidden;background:#e4e9df}#canvas{position:absolute;inset:0}canvas{display:block;outline:none}#canvas canvas{width:100%;height:100%;touch-action:none}.scene-top{position:absolute;left:23px;right:23px;top:19px;display:flex;justify-content:space-between;align-items:center;gap:12px;pointer-events:none}.scene-top>*{pointer-events:auto}.family-tabs{display:flex;gap:4px;background:#f9faf1d9;border:1px solid #cbd5c5;border-radius:9px;padding:4px}.family-tabs button{font-size:12px;border:0;padding:7px 11px;background:transparent}.family-tabs button.active{background:var(--green)}#viewBadge{font-size:11px;background:#fffff4bb;border:1px solid #cad3c4;border-radius:20px;padding:6px 11px;letter-spacing:1px}.scene-caption{position:absolute;left:25px;top:90px;pointer-events:none;max-width:57%}.scene-caption h2{font-size:25px;letter-spacing:1px;font-weight:500;margin:0 0 7px}.scene-caption p{font-size:12px;color:#65766d}.scene-caption .eyebrow{font-size:10px;margin-bottom:10px}.scene-tools{position:absolute;left:23px;bottom:50px;display:flex;gap:6px;align-items:center}.scene-tools button,.scene-tools label{font-size:11px;background:#fafff4d9;padding:7px 10px;border-radius:5px}.scene-foot{position:absolute;bottom:17px;left:23px;right:23px;display:flex;justify-content:space-between;font-size:10px;gap:12px;color:#6c7c71}.scene-foot span{background:#e7ede0c4;padding:2px 3px;border-radius:3px}aside{padding:28px 25px;border-left:1px solid var(--line);max-height:660px;overflow:auto}aside h2{font-size:22px;line-height:1.4}aside p{font-size:13px}.component-list{display:flex;flex-direction:column;gap:10px;margin-top:25px}.component-button{display:grid;grid-template-columns:35px 1fr 20px;text-align:left;gap:10px;align-items:center;background:#f7f8ef;padding:15px 12px}.component-button em,.all-card em{font-family:Georgia,serif;font-style:normal;color:#9c773e;font-size:24px}.component-button small{display:block;font-size:11px;font-weight:400;color:var(--muted);margin-top:6px}.component-button strong{font-size:13px}.lesson-note{border-top:1px solid var(--line);padding-top:23px;margin-top:30px}.lesson-note b{font-size:12px;font-weight:600}.lesson-note p{font-size:12px;color:var(--muted);margin-top:8px}.hotspot{position:absolute;padding:0;transform:translate(-50%,-50%);border:0;background:transparent!important;white-space:nowrap;display:flex;align-items:center;gap:5px;filter:drop-shadow(0 2px 4px #52634a24)}.hotspot b{display:grid;place-items:center;width:29px;height:29px;border:2px solid #fbffe9;border-radius:50%;font-size:12px;background:#b87839;color:#fff}.hotspot span{font-size:11px;background:#fffef4eb;border:1px solid #c9d1c0;border-radius:5px;padding:5px 7px}.hotspot:hover b{background:#345e56;transform:scale(1.12)}.hotspot.selected b{background:#315f59}#hotspots,#partLabels{position:absolute;inset:0;pointer-events:none}.hotspot{pointer-events:auto}.part-label{position:absolute;transform:translate(-50%,-50%);font-size:10px;white-space:nowrap;border:1px solid #b6c6b4;border-radius:4px;background:#fcfff1dd;padding:4px 6px;color:#38564f;box-shadow:0 1px 3px #546b4220}.type{font-size:11px!important;color:#967136;background:#f4eee0;border-radius:4px;padding:6px 9px;line-height:1.6}.work-heading{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:16px;margin-top:18px}.work-heading h3{margin:0}.work-heading button{font-size:11px;padding:5px 10px}.steps{padding:0;list-style:none;display:flex;gap:5px;margin:15px 0}.steps li{flex:1}.steps button{width:100%;font-size:10px;padding:7px 3px;line-height:1.45;border-radius:4px}.range-label{font-size:11px;display:block;margin:12px 0}.range-label output{float:right;color:#6b7e70}.range-label input{display:block;width:100%;margin:10px 0 0;accent-color:var(--green)}.stage-text{font-size:12px!important;min-height:66px;background:#edf2e6;border-left:3px solid #a1b28c;padding:10px 12px}.inspect{border-top:1px solid var(--line);padding-top:14px;margin-top:18px}.inspect>label{font-size:11px}.inspect input{accent-color:var(--green)}#explodeNote{font-size:11px;color:#977535}.scope{font-size:10px!important;color:#77816e;line-height:1.7;margin:12px 0 0}#locator{position:absolute;right:17px;top:83px;width:190px;border:1px solid #c0cbbc;border-radius:8px;overflow:hidden;background:#f7f9edee;box-shadow:0 4px 16px #44604410}#locator p{font-size:10px;padding:10px 11px 0;margin:0;line-height:1.2}#locator p span{float:right;color:#a17339}#locatorCanvas{height:100px;width:100%}#locator button{width:100%;border:0;border-radius:0;border-top:1px solid #dce2d3;background:#f8f9ed;font-size:11px;padding:8px}#loading{position:absolute;inset:0;display:grid;place-items:center;background:#e5ebdf;color:#5e7466;font-size:14px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:23px}.section-heading h2{font-family:Georgia,"SimSun",serif;font-weight:500;font-size:27px;margin:0}.section-heading>p{font-size:12px;color:var(--muted);max-width:390px;margin:0}.reference-section,.all-components{margin-top:39px}.references{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.reference-card{margin:0;border:1px solid var(--line);border-radius:10px;background:#fffdf6;overflow:hidden}.reference-card .image-link{display:flex;align-items:center;justify-content:center;height:215px;background:#e5e8de;overflow:hidden}.reference-card img{width:100%;height:100%;object-fit:contain}.reference-card figcaption{padding:15px 17px}.reference-card b{font-size:13px;font-weight:600}.reference-card p{font-size:11px;margin:8px 0;color:var(--muted)}.reference-card a{font-size:11px}.reference-card .kind{font-size:10px;color:#a2793c;display:block;margin-bottom:7px;letter-spacing:1px}.source-placeholder{padding:25px;color:#6c7969;text-align:center;font-size:13px}.book-row{display:grid;grid-template-columns:1fr 1fr;gap:35px;margin-top:24px;border-top:1px solid var(--line);padding-top:22px}.book-row p,.book-row li,.book-row summary{font-size:12px;line-height:1.8}.book-row ul{padding-left:16px;margin:0}.book-row details p{margin-top:12px}.book-row h3{font-size:13px}.all-cards{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}.all-card{display:block;text-align:left;padding:17px 15px;background:#eeefe5;min-height:137px}.all-card b{display:block;font-size:13px;margin:12px 0 5px}.all-card small{display:block;font-size:10px;color:var(--muted);line-height:1.6}.all-card em{font-size:22px}footer{border-top:1px solid var(--line);padding:22px 0 27px;margin-top:40px;font-size:10px;color:var(--muted);display:flex;gap:20px;flex-wrap:wrap}footer a{margin-left:auto}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(min-width:1500px){.scene,aside{height:730px;max-height:730px}.workspace{grid-template-columns:minmax(0,1fr) 360px}}
@media(max-width:1100px){main{padding:25px 20px 0}header{padding:18px 20px}.workspace{grid-template-columns:minmax(0,1fr) 300px}aside{padding:22px 19px}.scene-caption h2{font-size:22px}.scene{height:650px}#locator{width:155px}#locatorCanvas{height:86px}.all-cards{grid-template-columns:repeat(3,minmax(0,1fr))}.references{grid-template-columns:repeat(2,minmax(0,1fr))}.intro>p{max-width:250px}}
@media(max-width:780px){header{padding:17px 16px}.brand{font-size:16px}.brand span{font-size:9px}.back-link{font-size:10px}main{padding:23px 13px 0}.intro{display:block;margin-bottom:20px}h1{font-size:29px;line-height:1.4}.intro>p{margin-top:14px;font-size:11px;max-width:none}.intro .eyebrow{font-size:10px;margin-bottom:9px}.workspace{display:block}.scene{height:510px}aside{height:auto;max-height:none;border-left:0;border-top:1px solid var(--line);padding:23px}.scene-top{left:13px;right:13px;top:13px}.family-tabs button{font-size:10px;padding:6px 8px}#viewBadge{font-size:9px;padding:5px 8px}.scene-caption{left:17px;top:74px;max-width:65%}.scene-caption h2{font-size:21px}.scene-caption p{font-size:10px;max-width:185px}.scene-caption .eyebrow{font-size:9px;letter-spacing:1px}.scene-tools{left:13px;bottom:46px;gap:4px}.scene-tools button,.scene-tools label{font-size:10px;padding:6px 7px}.scene-foot{left:13px;right:13px;font-size:9px;bottom:13px}.scene-foot>span:first-child{max-width:210px}#locator{width:120px;top:76px;right:11px}#locatorCanvas{height:70px}#locator p{font-size:8px;padding:8px 7px 0}#locator button{font-size:9px;padding:6px}.detail-mode .scene-caption{max-width:58%}.detail-mode .scene-caption h2{font-size:18px}.detail-mode .scene-caption p{max-width:165px}.hotspot b{width:25px;height:25px;font-size:10px}.hotspot span{font-size:9px;padding:4px 5px}.part-label{font-size:9px;padding:3px 4px}.section-heading{display:block}.section-heading h2{font-size:25px}.section-heading>p{margin-top:14px}.reference-section,.all-components{margin-top:30px}.references{grid-template-columns:1fr}.reference-card .image-link{height:245px}.book-row{grid-template-columns:1fr;gap:23px}.all-cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.all-card{padding:15px;min-height:123px}.all-card b{font-size:12px}footer{font-size:9px;gap:13px;line-height:1.7}footer a{margin-left:0}}

.leaders{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.leaders line{stroke:#a27842;stroke-width:1;stroke-dasharray:3 3}

@media(max-width:780px){.detail-mode .scene{position:sticky;top:0;z-index:5;height:390px}.detail-mode .scene-caption{top:69px}.detail-mode #locator{top:70px}.detail-mode .scene-foot{font-size:8px}.detail-mode .scene-caption p{font-size:9px}.detail-mode .scene-tools{bottom:42px}}

.part-label{max-width:160px;white-space:normal;text-align:center;line-height:1.5}.detail-leaders line{stroke:#6f8f7a;stroke-dasharray:none;opacity:.6}@media(max-width:780px){.part-label{max-width:117px;font-size:8px}}

@media(max-width:780px){.detail-mode .workspace{overflow:visible}.detail-mode .scene{border-radius:12px 12px 0 0;box-shadow:0 6px 14px #354c3418}}

/* Five context choices remain visible on small screens. */
.family-tabs{display:flex;flex-wrap:wrap;gap:3px;max-width:calc(100% - 85px)}.family-tabs button{white-space:nowrap;padding:7px 10px}.scene-caption{top:100px}@media(max-width:780px){.family-tabs{max-width:100%;gap:2px}.family-tabs button{padding:5px 7px;font-size:10px}.scene-top{display:block}.scene-top #viewBadge{display:none}.scene-caption,.detail-mode .scene-caption{top:92px}.detail-mode #locator{top:93px}.scene-foot>span:last-child{max-width:88px;text-align:right}.all-cards{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* Question-led component lessons; technical names remain on model labels. */
.lesson-topic{display:block;font-size:.7em;color:#6a786a;font-weight:400;margin-top:8px;line-height:1.55}
.detail-objectives{border-top:1px solid var(--line);padding-top:10px;margin:13px 0;font-size:12px;line-height:1.8}
.detail-objectives summary{cursor:pointer;font-weight:600}.detail-objectives ul{padding-left:1.35em;margin:10px 0}.detail-objectives li{margin:6px 0}
.book-row{grid-template-columns:1fr}.lesson-answer{margin-top:28px;padding:23px 27px;border-left:3px solid #65877a;background:#f0f3e9;max-width:1000px}.lesson-answer h2{font-size:20px;line-height:1.6;margin-bottom:12px}.lesson-answer>p:last-child{font-size:15px;line-height:1.95;margin:0}
.all-cards{grid-template-columns:repeat(5,minmax(0,1fr))}.all-card b{line-height:1.7}.card-topic{font-size:11px;color:#546d61;display:block;line-height:1.7;margin-bottom:10px}
@media(max-width:1100px){.all-cards{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:780px){.all-cards{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-answer{padding:18px}.lesson-answer h2{font-size:18px}.lesson-answer>p:last-child{font-size:14px}.lesson-topic{font-size:16px}}

.detail-questions{border-left:2px solid #b99b68;padding-left:13px;margin:18px 0}.detail-questions h3{font-size:12px;color:#807052}.detail-questions ol{padding-left:1.3em;font-size:13px;line-height:1.85;margin:0}.detail-questions li+li{margin-top:7px}
.lesson-answer ol{padding-left:1.3em;font-size:14px;line-height:1.9;margin:0}.lesson-answer li+li{margin-top:16px}.lesson-answer li strong{font-weight:600}.lesson-answer li p{margin:6px 0 0}