:root{--ink:#27372f;--muted:#819087;--line:#e5e9e3;--green:#39704e;--lime:#dce9c0}*{box-sizing:border-box}body{margin:0;background:#f6f7f3;color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft Yahei',sans-serif;font-size:13px}button,input,textarea{font:inherit}button{cursor:pointer;transition:background .15s;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:7px;padding:9px 12px}button:hover{background:#ecf1e8}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid #82a65e;outline-offset:2px}button:disabled{opacity:.35;cursor:default}.primary{background:var(--green);border-color:var(--green);color:#fff}.primary:hover{background:#2b593b}header{height:78px;border-bottom:1px solid var(--line);background:#fff;display:flex;align-items:center;padding:0 26px;gap:25px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink);font-size:20px;font-weight:750;letter-spacing:1px}.brand small{display:block;font-size:8px;color:#909b8d;letter-spacing:2px;margin-top:4px}.brand-icon{background:#e9f0de;color:#486d37;font-size:32px;width:44px;height:44px;border-radius:12px;display:grid;place-items:center}.project-title{font-size:12px;color:#89948b;border-left:1px solid var(--line);padding-left:23px}.project-title i{margin:0 10px;color:#b8c2b6;font-style:normal}.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}.header-actions span{font-size:10px;color:#96a18f;margin-right:8px}.app{display:grid;grid-template-columns:244px minmax(360px,1fr) 270px;min-height:calc(100vh - 78px)}.library,.inspector{background:#fff}.library{border-right:1px solid var(--line);padding:24px 17px 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#456b2310}.library-footer{margin-top:auto;padding-top:22px;display:flex;flex-direction:column;gap:7px}.library-footer button{font-size:11px}.library-footer .text-button{border:0;color:#a3aca1;background:none;padding:5px}.viewport-wrap{min-width:0;display:flex;flex-direction:column;background:#eef0e9}.viewport-toolbar{height:54px;background:#fcfcf9;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 15px;gap:8px}.tool-group{display:flex;gap:3px;align-items:center}.tool-group button{border:0;background:none;font-size:11px;padding:8px 9px;color:#7d897b;white-space:nowrap}.tool-group button.active{background:#e7efdd;color:#456630}.tool span{font-size:16px;margin-right:5px}.divider{height:16px;width:1px;background:#d9ded4;margin:0 6px}#viewport{position:relative;flex:1;min-height:540px;overflow:hidden;outline:0;touch-action:none;background:#eceee6}#viewport canvas{display:block;position:absolute;inset:0;width:100%;height:100%;touch-action:none}.scene-badge{position:absolute;left:22px;top:23px;z-index:2;font-size:11px;display:flex;gap:7px;align-items:center;pointer-events:none}.scene-badge>span:last-child{font-size:9px;color:#98a18f}.live-dot{height:5px;width:5px;background:#7a9c5c;border-radius:50%}.view-switch{position:absolute;top:51px;left:20px;display:flex;gap:3px;z-index:3;background:#ffffffba;padding:4px;border:1px solid #e3e8db;border-radius:8px;backdrop-filter:blur(8px)}.view-switch button{font-size:10px;padding:7px 10px;background:transparent;border:0}.view-switch .active{background:#496a37;color:#fff}#labels-layer{position:absolute;inset:0;pointer-events:none;z-index:2}.model-label{position:absolute;font-size:9px;white-space:nowrap;background:#fffdf4e8;border:1px solid #d8decb;padding:4px 8px;border-radius:4px;color:#6d7e59;transform:translate(-50%,-100%);box-shadow:0 3px 8px #53673410}.model-label:after{content:'';position:absolute;height:13px;width:1px;background:#9aac85;left:50%;top:100%}.model-label.selected{border-color:#728e50;background:#f4f9e9;color:#47662f}.viewport-hint{position:absolute;bottom:18px;left:0;right:0;display:flex;justify-content:center;gap:20px;z-index:2;font-size:9px;color:#99a28e;pointer-events:none}.viewport-hint b{font-weight:500;color:#778566;margin-left:3px}.scene-footer{height:31px;background:#f8faf3;border-top:1px solid #e1e6d8;display:flex;align-items:center;padding:0 17px;gap:20px;font-size:9px;color:#939e87}.scene-footer i{width:5px;height:5px;background:#87a66b;border-radius:50%;display:inline-block;margin-right:5px}.scene-footer-end{margin-left:auto}.timeline-bar{display:flex;align-items:center;justify-content:center;gap:16px;height:65px;font-size:11px;background:#fafbf6;border-top:1px solid var(--line);color:#8a977d}.timeline-bar>div{display:flex;gap:7px;align-items:center}.timeline-bar b{color:#536c42;font-weight:600}.step-number{border:1px solid #dae3cc;border-radius:50%;width:22px;height:22px;display:grid;place-items:center;font-size:9px}.step-line{width:24px;height:1px;background:#d4dcc9}.inspector{border-left:1px solid var(--line)}.inspector section{padding:19px 18px;border-bottom:1px solid var(--line)}.section-heading{display:flex;align-items:center;gap:8px;margin-bottom:11px}.section-heading h2{font-size:12px;font-weight:700;margin:0;flex:1}.section-heading>span{font-size:10px;color:#9aa68d}.section-heading>button{border:0;padding:0 4px;font-size:16px;color:#9aa68d}.muted{font-size:10px;line-height:1.7;color:#93a08b;margin-bottom:17px}#outliner{max-height:190px;overflow:auto}.object-row{width:100%;padding:8px 7px;border:0;display:flex;gap:8px;text-align:left;background:none;font-size:11px;color:#8c9685;border-radius:5px}.object-row.selected{background:#edf3e3;color:#47633a}.object-row span:last-child{margin-left:auto;font-size:9px}.property-label{font-size:10px;color:#8b9682;margin:14px 0 7px}.property-label small{float:right;font-size:9px;color:#a2ab99}.xyz{display:flex;gap:5px}.xyz label{display:flex;align-items:center;border:1px solid #e7ebe1;border-radius:5px;background:#fafbf7;min-width:0;padding:7px 5px;gap:3px}.xyz label>span{font-size:9px;color:#a3ae98}.xyz label:nth-child(1)>span{color:#bd7f72}.xyz label:nth-child(2)>span{color:#85a16c}.xyz label:nth-child(3)>span{color:#7a94b4}.xyz input{width:100%;min-width:0;border:0;outline:0;background:none;color:#596750;font-size:10px;-moz-appearance:textfield}.xyz input::-webkit-inner-spin-button{display:none}.toggle-row{display:flex;align-items:center;justify-content:space-between;margin-top:15px;font-size:11px;color:#7c8b6f}.toggle-row input{accent-color:#65834b}textarea{width:100%;resize:vertical;font-size:11px;padding:11px;border:1px solid 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b{position:absolute;font-size:10px;font-weight:600}.axis-y{top:0;left:22px;color:#7b9c56}.axis-y:after{content:'';position:absolute;height:17px;width:1px;background:#98b97a;top:12px;left:3px}.axis-x{bottom:8px;right:0;color:#b7806d}.axis-z{bottom:8px;left:0;color:#7b9cb4}.axis-x:before,.axis-z:before{content:'';position:absolute;width:17px;height:1px;top:-3px;background:currentColor}.axis-x:before{left:-16px;transform:rotate(30deg)}.axis-z:before{left:8px;transform:rotate(-30deg)}#section-panel{position:absolute;top:99px;left:22px;z-index:3;background:#fffff6ee;border:1px solid #dfe6cb;padding:12px;width:225px;border-radius:8px}#section-panel>div{display:flex;justify-content:space-between;font-size:10px;color:#768954}#section-panel input{width:100%;accent-color:#8da658;margin-top:10px}#section-panel p{font-size:9px;color:#9ba986;margin:6px 0 0}#loading{position:absolute;inset:0;z-index:10;background:#eff1e8;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:15px;color:#68824f}#loading small{color:#99a889;font-size:11px}.spinner{width:32px;height:32px;border:2px solid #d7e2c9;border-top-color:#68854b;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#drop-hint{display:none;pointer-events:none;position:absolute;inset:10px;border:2px dashed #80995f;background:#dfeacd55;border-radius:10px;z-index:5;align-items:end;justify-content:center;padding:50px;color:#547338;font-size:15px}#toast{position:absolute;bottom:65px;left:50%;transform:translateX(-50%);background:#384e2fe8;color:#fff;padding:10px 16px;border-radius:7px;z-index:8;font-size:11px;display:none;max-width:90%;text-align:center}dialog{border:1px solid #e1e7d8;border-radius:16px;padding:25px;width:min(960px,94vw);max-height:90vh;color:#35462c;box-shadow:0 15px 90px #23301940}dialog::backdrop{background:#19271377;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between}.dialog-head h2{margin:8px 0 20px;font-size:22px}.dialog-head button{border:0;font-size:20px}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:24px}.sheet-images{display:grid;grid-template-columns:1fr 1fr;gap:12px}.sheet-images img{width:100%;border-radius:8px;border:1px solid #e0e6d7}.sheet-images small{display:block;margin:6px 0;color:#8e9b80}.sheet-table{width:100%;border-collapse:collapse;font-size:11px;margin:16px 0}.sheet-table th,.sheet-table td{padding:8px;text-align:left;border-bottom:1px solid #e4e8de}.sheet-notes{font-size:12px;line-height:1.8;white-space:pre-wrap}.drag-ghost{position:fixed;pointer-events:none;z-index:200;width:70px;height:70px;object-fit:contain;border-radius:10px;background:#fffffff0;border:1px solid #97b17c;box-shadow:0 10px 30px #37472b33;transform:translate(-50%,-50%)}[hidden]{display:none!important}@media(min-width:1500px){.app{grid-template-columns:265px minmax(400px,1fr) 295px}.material img{height:93px}.inspector section{padding:22px}#viewport{min-height:600px}}@media(max-width:1120px){.app{grid-template-columns:196px minmax(320px,1fr) 230px}.library{padding:19px 12px}.project-title{display:none}.inspector section{padding:15px 12px}.material img{height:62px}.viewport-toolbar{padding:0 7px}.tool-group button{padding:8px 6px}.scene-badge>span:last-child{display:none}.timeline-bar{gap:7px;font-size:9px}}@media(max-width:820px){header{height:65px;padding:0 15px}.brand{font-size:17px}.header-actions span,.brand small{display:none}.header-actions button{font-size:11px;padding:8px}.app{grid-template-columns:160px 1fr}.inspector{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr}.inspector .lighting{display:none}.library{padding:15px 10px}.aside-title p{line-height:1.5}.materials{gap:5px}.material img{height:55px}.material .name{font-size:10px}.material .role{font-size:8px}.viewport-hint{gap:9px;font-size:8px}.timeline-bar{display:none}.scene-footer-end{display:none}}@media(max-width:520px){.brand-icon{width:32px;height:32px;font-size:24px}.brand{font-size:14px;gap:6px}header{gap:7px;padding:0 10px}.header-actions{gap:5px}.app{display:flex;flex-direction:column}.library{order:2}.aside-title{display:none}.materials{display:flex;overflow-x:auto;padding:5px}.material{min-width:95px}.library-footer{flex-direction:row;padding-top:8px}.viewport-wrap{order:1}#viewport{min-height:480px}.inspector{order:3;display:block}.scene-badge{font-size:10px}.sheet-images{grid-template-columns:1fr}.dialog-actions{flex-wrap:wrap}.viewport-hint{bottom:10px}.scene-footer{font-size:8px;gap:10px}}
@media print{body>header,body>.app{display:none!important}body{background:#fff}dialog{position:static;display:block!important;border:0;padding:0;box-shadow:none;max-height:none;width:100%;overflow:visible}.dialog-head button,.dialog-actions{display:none}dialog::backdrop{display:none}.sheet-images{grid-template-columns:1fr 1fr}.sheet-table{font-size:9px}.sheet-images img{max-height:300px;object-fit:contain}#sheet-content{break-inside:avoid}}

/* Student-friendly controls: simple actions first, precise controls on demand. */
.main-tools{gap:4px;min-width:0}.main-tools #advanced-tools{gap:2px}.snap-control{display:flex;align-items:center;gap:4px;padding:7px 9px;border-radius:7px;background:#eff5e7;color:#52753c;font-size:11px;white-space:nowrap;cursor:pointer}.snap-control input{margin:0;accent-color:#568442}.tool-group #advanced-toggle{border:1px solid #e1e8da;font-size:10px;color:#77886d;padding:7px 9px}.tool-group #advanced-toggle.active{background:#e5efdb;color:#426a33;border-color:#cbdcc0}.simple-actions{display:grid;grid-template-columns:1fr 1fr;gap:6px}.simple-actions button{font-size:11px;padding:9px 5px}.simple-actions .remove-action{color:#a16c5a}.placement-note{font-size:10px;line-height:1.6;color:#809177;margin:10px 0 0}.advanced-title{margin:16px 0 0;padding-top:12px;border-top:1px solid #e7ece0;font-size:11px;font-weight:700;color:#6b7e60}#snap-notice{position:absolute;z-index:6;pointer-events:none;left:50%;bottom:60px;transform:translateX(-50%);background:#3f6f48ed;color:#fff;border-radius:8px;padding:9px 13px;font-size:11px;box-shadow:0 5px 20px #31492a30;white-space:nowrap;max-width:90%;text-overflow:ellipsis;overflow:hidden}#drop-hint span{background:#527842;color:#fff;padding:9px 14px;border-radius:8px;font-size:12px;box-shadow:0 6px 20px #384f2b33}
@media(max-width:1120px){.snap-control{padding:6px;font-size:10px}.tool-group #advanced-toggle{padding:6px}.main-tools{gap:2px}}
@media(max-width:820px){.viewport-toolbar{height:auto;min-height:54px;gap:4px;flex-wrap:wrap;padding:6px}.main-tools,.secondary-tools{flex-wrap:wrap}.inspector .lighting{display:block}}
@media(max-width:520px){.library{order:1}.viewport-wrap{order:2}.library-footer{overflow-x:auto}.library-footer button{white-space:nowrap}.viewport-toolbar{justify-content:flex-start}.secondary-tools{margin-left:auto}.scene-badge{top:17px}.view-switch{top:42px}#viewport{min-height:440px}}
.material .name{font-size:12px}.material .role{font-size:10px}.material .plus{width:22px;height:22px;background:#fff9;border-radius:50%;display:grid;place-items:center;color:#5b8545;font-size:18px}.simple-actions button{min-height:38px;font-size:12px}.section-heading h2{font-size:13px}.object-row{font-size:12px;padding:10px 7px}.placement-note,.muted{font-size:11px;line-height:1.7}.toggle-row{min-height:30px;font-size:12px}.toggle-row input{width:18px;height:18px}.main-tools #tool-move{cursor:default}body:not(.advanced-editing) .axes,body:not(.advanced-editing) #grid{display:none}.view-switch button{min-height:34px;font-size:11px}#snap-notice{font-size:12px}#drop-hint{padding:28px 14px;align-items:end}.viewport-hint{font-size:10px}.tool-group #advanced-toggle,.snap-control{font-size:11px}
@media(max-width:1120px){.viewport-toolbar{height:auto;min-height:54px;flex-wrap:wrap;gap:4px;padding:7px}.material .name{font-size:11px}.material .role{font-size:9px}.secondary-tools{margin-left:auto}}
@media(max-width:520px){.material{min-width:96px}.material .name{font-size:11px}.viewport-hint{font-size:9px;gap:10px}.header-actions button{min-height:36px}.simple-actions{grid-template-columns:1fr 1fr}.simple-actions button{min-height:42px}.library-footer{gap:6px}.library-footer button{font-size:10px}.materials{padding-bottom:8px}#viewport{min-height:430px}}
#drop-hint{background:#dfeacd11}.drag-ghost{width:62px;height:48px;transform:translate(14px,14px);opacity:.94}button{-webkit-tap-highlight-color:transparent}
@media(max-width:520px){.material{touch-action:pan-x}.materials{touch-action:pan-x}}

/* Personal assembly, mutually exclusive materials and synchronized observations. */
.choice-guide{padding:11px 12px;border:1px solid #dfe8d4;border-radius:9px;background:#f6f9f0;margin-bottom:12px;display:grid;gap:6px;font-size:10px;color:#748769}.choice-guide>b{font-size:11px;color:#47683c;margin-bottom:2px}.choice-guide>span{display:flex;justify-content:space-between;gap:8px}.choice-guide em{font-style:normal;color:#4d6c41}.choice-guide small{font-size:9px;color:#96a48c;margin-top:3px}.material.chosen{border-color:#6a914d;background:#f2f7e9;box-shadow:0 0 0 1px #8aa96655}.material.chosen .plus{background:#557d41;color:white;font-size:13px}.material.alternative .plus{color:#637d54}.material.alternative .role{color:#7f936f}.library-footer{margin-top:16px}.assembly-log ol{list-style:none;padding:0;margin:0;display:grid;gap:7px;color:#7f8f73;font-size:10px;max-height:178px;overflow:auto}.assembly-log li{display:flex;align-items:baseline;gap:9px;line-height:1.6}.assembly-log li b{color:#92a27d;font-size:9px;font-variant-numeric:tabular-nums}.assembly-log li:last-child{color:#3d693d}.mini-heading{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#526f43;margin:0 0 10px}.mini-heading>span{font-size:10px;color:#95a087}#mini-views{padding:13px 16px;background:#f5f7ef;border-top:1px solid #dde5d4;position:relative}.mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mini-grid figure{margin:0;min-width:0;border:1px solid #d9e2ce;background:#eceee6;border-radius:9px;overflow:hidden}.mini-grid figcaption{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;background:#fffffff0;color:#557047;font-size:10px}.mini-grid figcaption span{color:#9ba78e;font-size:9px}.mini-surface{position:relative;height:145px;overflow:hidden}.mini-surface canvas{width:100%;height:100%;display:block}.cut-indicator{position:absolute;left:6%;right:6%;top:50%;border-top:1px dashed #91a27799;padding-top:4px;text-align:right;font-size:9px;color:#718c53;pointer-events:none}#section-panel{position:static;display:grid;grid-template-columns:130px 1fr;gap:4px 15px;width:auto;background:none;border:0;padding:10px 0 0;border-radius:0}#section-panel>div{align-items:center}#section-panel input{margin:0;min-width:0}#section-panel p{grid-column:2;margin:0;font-size:9px}.assessment-header{display:flex;align-items:center;gap:12px;padding:13px;background:#edf4e3;border:1px solid #d8e5c9;border-radius:9px;margin:12px 0}.assessment-score{font-size:32px;color:#497635;line-height:1;font-weight:750}.assessment-score small{font-size:11px;color:#9aab86;font-weight:400}.assessment-header b{display:block;color:#526f40;font-size:12px}.assessment-header p{font-size:10px;margin:3px 0 0;color:#8a9b79}.score-breakdown{display:grid;gap:6px;font-size:10px}.score-breakdown>div{display:flex;justify-content:space-between;gap:8px}.assessment-issue{margin:12px 0;padding:9px 10px;border-left:2px solid #c7a36b;background:#faf6eb;border-radius:0 5px 5px 0;line-height:1.7}.assessment-issue b{font-size:11px;color:#876d46}.assessment-issue p{margin:4px 0;font-size:10px;color:#8b826d}.assessment-issue button{font-size:10px;padding:5px 8px;margin-top:4px}.assessment-positive{font-size:11px;color:#65834b;line-height:1.8}.rubric-details{font-size:10px;margin-top:12px;color:#95a087}.rubric-details summary{cursor:pointer;color:#6c835c}.assessment-issue .deduction{float:right;font-size:9px;color:#a17d49}.assessment-issue[data-severity="info"]{border-left-color:#91a76e;background:#f4f6ef}.assessment-header[data-grade="revise"]{background:#f7f0df;border-color:#e7d8b7}.assessment-header[data-grade="revise"] .assessment-score{color:#9b7a43}#viewport{min-height:510px}.viewport-hint{bottom:12px}.view-switch{max-width:calc(100% - 25px);flex-wrap:wrap}.view-switch button{padding:6px 8px}.scene-footer{flex-shrink:0}.timeline-bar{height:53px;flex-shrink:0}.review-button{font-size:12px;min-height:40px}
@media(min-width:1500px){.mini-surface{height:164px}#viewport{min-height:565px}}
@media(max-width:1120px){.mini-surface{height:130px}#mini-views{padding:11px}.mini-grid{gap:8px}.mini-grid figcaption span{display:none}#section-panel{grid-template-columns:110px 1fr;gap:4px 8px}.choice-guide{padding:9px;font-size:9px}.choice-guide>b{font-size:10px}}
@media(max-width:820px){.inspector{grid-template-columns:1fr 1fr}.mini-surface{height:145px}.inspector .assembly-log{grid-column:auto}.choice-guide{font-size:9px}#viewport{min-height:480px}}
@media(max-width:520px){.choice-guide{display:none}.mini-surface{height:125px}#mini-views{padding:10px}.mini-heading{margin-bottom:7px}.mini-heading>span{font-size:9px}#section-panel{grid-template-columns:112px 1fr}#section-panel p{grid-column:1/-1}#viewport{height:430px;min-height:430px;flex:none}.inspector{display:block}.mini-grid figcaption{padding:7px 9px}.materials{gap:7px}.material{min-width:108px}.material img{height:58px}.library-footer{margin-top:0}.assembly-log ol{max-height:170px}.scene-badge{left:13px}.view-switch{left:10px}.viewport-hint{font-size:8px}.view-switch button{font-size:10px;padding:6px 7px}}
@media(prefers-reduced-motion:reduce){button{transition:none}}
@media(min-width:821px){.app{height:calc(100dvh - 78px);min-height:720px;overflow:hidden}.library,.inspector{min-height:0;overflow-y:auto}.viewport-wrap{height:100%;min-height:0}#viewport{min-height:330px}.library{display:block}.library-footer{padding-top:10px;margin-top:8px}.material .role{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:9px}.mini-surface{height:128px}.mini-grid figcaption{padding:7px 10px}.timeline-bar{height:43px}.mini-heading{margin-bottom:7px}}
@media(min-width:1500px){.mini-surface{height:145px}}