@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&display=swap');
/* Voice is a nonmodal companion; all assembly controls stay usable. */
.topbar-actions{display:flex;gap:8px;min-width:0;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.has-active-voice .topbar{position:sticky;top:0;z-index:15;background:#fff;box-shadow:0 2px 8px #20365a0c}.has-active-voice .viewer-panel,.has-active-voice .manual-panel,.copilot-panel{scroll-margin-top:120px}#copilot-quick-end{color:#a33d2b}
#copilot-toggle{gap:6px;flex-wrap:wrap}#copilot-indicator{font-size:11px;color:#3154c9}#copilot-indicator:empty{display:none}.voice-active{border-color:#3456e9!important;background:#edf1ff!important}
.copilot-panel{padding:20px 32px;background:#f5f7ff;border-bottom:1px solid #dae2f7;color:#46526a;min-width:0}
.copilot-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px}.copilot-heading>div{min-width:0}.copilot-heading h2{font-size:19px;margin-top:5px;color:#263858}.copilot-heading .icon-button{flex-shrink:0}
.copilot-panel>p{font-size:14px;line-height:1.6;max-width:950px}.copilot-panel .copilot-privacy{font-size:12px;margin-top:6px;color:#657084}
.copilot-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:14px}.copilot-controls>span{font-size:13px;flex:1 1 250px;min-width:0;overflow-wrap:anywhere}.copilot-panel[data-state=error] #copilot-status{color:#a33d2b}
.copilot-key{max-width:680px;margin-top:14px;min-width:0}.copilot-key summary{cursor:pointer;font-size:13px;color:#657084}.copilot-key[open] summary{margin-bottom:12px}.copilot-key label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}.copilot-key label span{font-weight:400;color:#657084}.copilot-key input{display:block;width:100%;min-width:0;max-width:480px;border:1px solid #b8c5e0;border-radius:6px;background:#fff;padding:10px 12px;font:inherit;font-size:14px;color:#263858}.copilot-key input:disabled{background:#eaf0fa;color:#657084}.copilot-key p{font-size:12px;color:#657084;line-height:1.6;margin-top:6px}
.copilot-transcript{max-height:160px;overflow:auto;overflow-wrap:anywhere;scrollbar-width:thin;font-size:14px;line-height:1.6}.copilot-transcript:not(:empty){margin-top:14px;padding:10px 12px;border:1px solid #dee5f3;background:#fff;border-radius:7px}.copilot-transcript p+p{margin-top:5px}#copilot-audio{max-width:100%;margin-top:8px}#copilot-audio-note{margin-top:10px}
@media(max-width:560px){.topbar{height:auto!important;min-height:68px;gap:8px;padding-top:10px!important;padding-bottom:10px!important}.topbar-actions{gap:5px;max-width:220px}.topbar-actions .button{padding:8px!important;font-size:12px!important}.copilot-panel{padding:16px}.copilot-heading h2{font-size:18px}.copilot-controls>span{flex-basis:100%}.copilot-panel>p{font-size:13px}.copilot-transcript{max-height:140px}}
:root{font-family:'DM Sans',Arial,sans-serif;color:#202530;background:#fff;font-synthesis:none;font-size:16px;--muted:#767e8d;--blue:#3456e9;--line:#e8ebf0;--soft:#f6f7f9}*{box-sizing:border-box}body{margin:0}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.3;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #7190ff;outline-offset:3px}a{color:inherit;text-decoration:none}button{color:inherit}h1,h2,p{margin:0}button{border:0;background:none}.topbar{height:77px;padding:0 32px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:9px;font-size:27px;font-weight:700;letter-spacing:-1px}.brand svg{width:29px;height:31px;stroke:var(--blue);stroke-width:2;fill:none;stroke-linejoin:round}.beta{font-size:12px;letter-spacing:1px;border:1px solid #dce1ec;padding:3px 5px;border-radius:4px;font-weight:600;margin-left:4px;color:#81899b}.topnote{color:#89909c;font-size:14px}.button{border:1px solid #dce1e9;border-radius:7px;display:inline-flex;gap:10px;align-items:center;justify-content:center;padding:10px 15px;font-size:14px;font-weight:600;white-space:nowrap;background:white;transition:background .15s}.button:hover{background:#f2f4f9}.button.primary{background:var(--blue);border-color:var(--blue);color:#fff}.button.primary:hover{background:#2445d1}.projectbar{height:111px;padding:0 32px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.eyebrow{font-size:12px;letter-spacing:1.8px;color:#8b919d;font-weight:650}h1{font-size:27px;letter-spacing:-.8px;font-weight:600;margin-top:8px;display:flex;align-items:center;gap:15px}.guide-tag{background:#f0f3ff;color:#5970c8;padding:5px 8px;font-size:12px;letter-spacing:0;border-radius:4px;font-weight:500}.project-meta{display:flex;align-items:center;gap:18px;color:var(--muted);font-size:13px}.divider{height:17px;width:1px;background:var(--line)}.workspace{display:grid;grid-template-columns:220px minmax(380px,1fr) 310px;min-height:620px;height:calc(100dvh - 188px)}.steps-panel{display:flex;flex-direction:column;min-height:0;border-right:1px solid var(--line)}.panel-heading{padding:25px 20px 18px;display:flex;align-items:center;justify-content:space-between;gap:10px}.panel-heading h2{font-size:13px;font-weight:600}.small{font-size:12px;color:#9096a2}.step-list{overflow:auto;padding:0 10px 15px;scrollbar-width:thin;flex:1}.step-item{width:100%;text-align:left;display:flex;align-items:center;gap:12px;border-radius:7px;padding:12px 10px;margin-bottom:3px;font-size:13px;color:#67707e;line-height:1.35}.step-item:hover{background:#f6f7fa}.step-item.active{background:#edf1ff;color:#294bdd}.step-item small{display:block;font-size:12px;color:#97a0b1;margin-top:3px}.step-item.active small{color:#7e91ce}.step-number{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:23px;height:23px;border:1px solid #e4e8ef;border-radius:50%;font-size:12px;color:#9ba1ad}.active .step-number{background:var(--blue);border-color:var(--blue);color:#fff}.step-item.done .step-number{color:var(--blue);background:#f1f3fb}.chapter{padding:18px 12px 9px;font-size:12px;letter-spacing:1.3px;color:#9ba2ae;font-weight:650}.sidebar-note{display:flex;gap:10px;border-top:1px solid var(--line);padding:19px 16px;align-items:flex-start}.sidebar-note p{font-size:12px;line-height:1.7;color:#939aa6}.note-icon{display:grid;place-items:center;border:1px solid #b4bbc7;border-radius:50%;width:14px;height:14px;font-size:12px;color:#a3aab7;margin-top:2px;flex-shrink:0}.viewer-panel{display:flex;flex-direction:column;min-width:0;min-height:0}.scene{background:#f6f7f9;position:relative;flex:1;min-height:350px;overflow:hidden}.scene canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;display:block}.canvas-header{position:absolute;z-index:2;top:20px;left:24px;right:20px;display:flex;align-items:center;justify-content:space-between;pointer-events:none}.view-label{font-size:12px;letter-spacing:1.5px;font-weight:600;color:#929aa9;display:flex;align-items:center;gap:8px}.cube-icon{font-size:22px;font-weight:400;color:#a6adba}.view-tools{display:flex;align-items:center;gap:6px;pointer-events:auto}.tool-button,.icon-button{border:1px solid #e2e6ed;border-radius:6px;background:#ffffffc9;height:32px;padding:0 10px;font-size:12px}.tool-button[aria-pressed=true]{border-color:#b9c6fd;background:#edf1ff;color:var(--blue)}.icon-button{width:32px;display:inline-flex;align-items:center;justify-content:center;font-size:21px;padding:0}.icon-button:hover{background:#f0f2f8}.view-caption{position:absolute;bottom:19px;left:24px;font-size:12px;color:#9aa2b0;display:flex;gap:7px;align-items:center;pointer-events:none}.hint-dot{width:5px;height:5px;background:#b0b8c7;border-radius:50%}.orientation{position:absolute;bottom:15px;right:20px;font-size:12px;color:#a3aabb;display:flex;gap:6px;align-items:center}.orientation span{font-size:22px}.instruction{padding:23px 28px 20px;border-top:1px solid var(--line);min-height:169px}.instruction-top{display:flex;justify-content:space-between;align-items:center;gap:12px}.instruction .eyebrow{color:var(--blue);font-size:12px;letter-spacing:1.6px}.page-pill{font-size:12px;color:#9ba2af}.instruction h2{font-size:22px;font-weight:550;letter-spacing:-.5px;line-height:1.3;margin:10px 0 7px}.instruction p{font-size:14px;line-height:1.65;color:#7d8593;max-width:670px}.parts{display:flex;gap:6px;margin-top:13px;flex-wrap:wrap}.parts span{font-size:12px;background:#f6f7f9;border:1px solid #eceff3;border-radius:4px;padding:4px 7px;color:#838b98}.player{padding:18px 22px;display:flex;gap:12px;align-items:center;border-top:1px solid var(--line);min-height:78px}.player>.icon-button{border:0;font-size:27px}.play-button{width:38px;height:38px;flex-shrink:0;border-radius:50%;color:var(--blue);background:#edf1ff;font-size:12px;display:grid;place-items:center}.timeline{flex:1;min-width:35px}.timeline input{width:100%;display:block;height:3px;accent-color:var(--blue);cursor:pointer;margin:4px 0 8px}.timeline-labels{display:flex;justify-content:space-between;font-size:12px;color:#a1a8b4}.speed-button{color:#8c95a3;font-size:12px;min-width:30px}.manual-panel{background:#fafbfc;border-left:1px solid var(--line);overflow:auto;padding-bottom:24px}.linked-label{color:#8f9ac0;font-size:12px}.manual-paper{margin:0 21px;background:white;border:1px solid #e7eaf0;box-shadow:0 3px 10px #1c294d06;min-height:310px}.manual-expand{display:block;width:100%;padding:0}.manual-paper img{display:block;width:100%;height:auto}.manual-paper canvas{width:100%;height:auto}.manual-pagination{display:flex;justify-content:center;align-items:center;gap:26px;margin-top:18px;font-size:12px;color:#9ba3b2}.manual-pagination .icon-button{font-size:20px;background:none;border:0;width:23px}.source-note{margin:28px 25px 0;padding-top:24px;border-top:1px solid var(--line)}.source-note strong{font-size:12px;font-weight:500;color:#818999}.source-note p{font-size:12px;line-height:1.7;color:#a0a7b3;margin:8px 0 15px}.source-note a{font-size:12px;color:#a3abb9}.text-button{font-size:12px;color:var(--blue);display:block;margin:12px auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}dialog{border:1px solid #e2e6ef;border-radius:14px;padding:25px 28px;width:min(500px,calc(100% - 32px));max-height:90dvh;color:#252c3b;box-shadow:0 30px 90px #18243b2b}dialog::backdrop{background:#17223b55;backdrop-filter:blur(4px)}.dialog-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}dialog h2{font-size:27px;letter-spacing:-1px;margin:12px 0}dialog p{font-size:14px;color:#8b93a1;line-height:1.65}.dropzone{position:relative;margin:24px 0 16px;border:1px dashed #bcc8ed;background:#f5f7ff;border-radius:9px;padding:25px 15px;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;cursor:pointer}.dropzone.dragging{background:#e7edff;border-color:var(--blue)}.dropzone strong{font-size:14px;font-weight:550}.dropzone>span:last-of-type{font-size:12px;color:#8994af}.upload-symbol{font-size:26px;color:var(--blue)}.dropzone input{position:absolute;width:1px;height:1px;opacity:0}.dropzone:focus-within{outline:3px solid #7190ff;outline-offset:3px}.upload-note{font-size:12px!important;margin:16px 0 22px}.full-width{width:100%}.upload-status{font-size:13px;color:#4f67ac;line-height:1.7;overflow-wrap:anywhere}.upload-status.error{color:#b34936}.upload-status button{display:block;margin-top:12px}.toast{position:fixed;z-index:20;bottom:24px;left:50%;transform:translateX(-50%);padding:12px 20px;background:#252e43;color:white;border-radius:8px;font-size:13px;box-shadow:0 8px 20px #18243b20;max-width:90vw}.scene-error{position:absolute;z-index:3;inset:100px 30px auto;background:#fff;padding:24px;font-size:14px;color:#687286;border-radius:10px}.manual-panel.preview-only .linked-label{color:#aa7838}#manual-dialog{width:min(750px,95vw)}#large-manual-image{max-width:100%;display:block;margin:auto}.manual-panel.preview-only #manual-expand{cursor:default}
@media(min-width:1500px){.workspace{grid-template-columns:245px minmax(450px,1fr) 355px}.manual-paper{margin:0 26px}.step-item{padding:13px}.scene{min-height:430px}.instruction{padding:26px 34px}.instruction h2{font-size:25px}}
@media(max-width:1100px){.workspace{grid-template-columns:185px minmax(300px,1fr) 255px}.topbar,.projectbar{padding-left:22px;padding-right:22px}.panel-heading{padding:23px 14px 17px}.panel-heading h2{font-size:12px}.manual-paper{margin:0 15px;min-height:0}.instruction{padding:20px}.instruction h2{font-size:20px}.player{padding:15px 12px;gap:7px}.player .primary{font-size:12px;padding:10px}.source-note{margin:23px 18px}.step-item{font-size:12px;padding:10px 7px;gap:9px}}
@media(max-width:850px){.topnote{display:none}.workspace{grid-template-columns:155px minmax(300px,1fr)}.manual-panel{grid-column:1/-1;border-top:1px solid var(--line);border-left:0;display:grid;grid-template-columns:1fr 1fr;height:auto;overflow:visible}.manual-panel .panel-heading{grid-column:1/-1}.manual-paper{grid-column:1;grid-row:2/5;max-width:340px}.manual-pagination{grid-column:2;align-self:start}.source-note{grid-column:2;margin-top:0}.workspace{height:auto;min-height:0}.viewer-panel{min-height:690px}.steps-panel{max-height:690px}.scene{min-height:385px}.topbar{height:68px}.projectbar{height:100px}.manual-panel{padding:10px 15px 25px}.source-note{border:0}.sidebar-note{padding:15px 10px}.sidebar-note p{font-size:12px}}
@media(max-width:560px){.topbar{padding:0 16px}.brand{font-size:25px}.brand svg{width:25px}.beta{display:none}.topbar .button{font-size:12px;padding:9px 11px}.projectbar{padding:20px 16px;height:auto}.project-meta{display:none}h1{font-size:24px;gap:10px}.guide-tag{font-size:12px}.workspace{display:flex;flex-direction:column}.steps-panel{border:0;border-bottom:1px solid var(--line);display:block}.steps-panel .panel-heading,.sidebar-note,.chapter{display:none}.step-list{display:flex;padding:9px 12px;gap:5px;overflow-x:auto}.step-item{width:auto;flex-shrink:0;padding:7px 9px;margin:0;font-size:12px}.step-item small{display:none}.step-item:not(.active)>span:last-child{display:none}.step-number{width:23px;height:23px}.viewer-panel{min-height:650px}.scene{min-height:365px}.canvas-header{left:16px;right:16px;top:15px}.view-caption{left:16px;font-size:12px}.instruction{padding:19px 18px;min-height:190px}.instruction h2{font-size:22px}.instruction p{font-size:14px}.player{padding:15px 12px}.timeline-labels span:last-child{display:none}.player .primary{max-width:135px;font-size:12px;padding:10px;gap:5px}.manual-panel{display:block}.manual-panel .panel-heading{padding:17px 8px}.manual-paper{margin:auto;max-width:340px}.source-note{margin:20px 8px 0;border-top:1px solid var(--line)}.manual-pagination{margin-top:10px}.manual-panel p{font-size:13px}.manual-panel .source-note a{font-size:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Readable controls and source details on a restrained working surface. */
.panel-heading h2,.step-item,.tool-button,.speed-button,.manual-pagination,.source-note strong{font-size:14px}.instruction p,dialog p{font-size:16px;color:#657084}.instruction{min-height:200px}.parts span,.eyebrow,.small,.page-pill,.linked-label,.view-label,.view-caption,.timeline-labels,.step-item small,.chapter,.sidebar-note p,.source-note p,.source-note a{color:#737e90}.step-item{color:#616d7f}.manual-panel .panel-heading{flex-wrap:wrap}.sidebar-note p{line-height:1.6}.source-note p{font-size:14px}.view-caption{max-width:calc(100% - 60px);line-height:1.5}.orientation{display:none}.tool-button{font-size:12px}.manual-panel.preview-only .source-note strong{color:#9b642f}.manual-panel.preview-only .source-note p{color:#765a3f}.upload-status{font-size:14px}.step-item.active small{color:#536eaf}.guide-tag{font-size:12px}.canvas-header{gap:10px}.view-tools{flex-shrink:0}@media(max-width:1100px){.step-item{font-size:14px;gap:7px}.panel-heading h2{font-size:14px}.small{font-size:12px}.view-label{display:none}.canvas-header{justify-content:flex-end}.manual-pagination{gap:12px}.instruction{min-height:225px}}@media(max-width:560px){.step-item{font-size:14px}.view-label{display:flex}.viewer-panel{min-height:720px}.scene{min-height:370px}.instruction{min-height:230px}.canvas-header{justify-content:space-between}.view-tools{gap:4px}.tool-button{padding:0 7px}.brand .beta{display:none}.view-caption{font-size:12px;bottom:14px}}

.view-label{letter-spacing:0;font-size:12px;text-transform:none;max-width:200px;line-height:1.5}.canvas-header{align-items:flex-start;flex-wrap:wrap}.view-tools{flex-wrap:wrap;justify-content:flex-end;gap:5px}#guided-view[aria-pressed=true]{background:#eaf0ff;border-color:#c2d0f8;color:#3456c7}#reset-view{display:none}#underside{font-size:12px}.detail-sequence{position:absolute;z-index:2;left:24px;bottom:53px;display:flex;align-items:center;gap:8px;background:#ffffffed;border:1px solid #e2e6ee;border-radius:7px;padding:7px 10px;box-shadow:0 3px 10px #20365a08;font-size:12px;color:#929baa}.detail-sequence span{padding:5px 7px;border-radius:4px}.detail-sequence span.current{background:#eaf0ff;color:#3157cf}.detail-sequence strong{font-weight:600}.detail-sequence b{font-weight:400}.view-caption{bottom:18px;background:#f6f7f9dc;border-radius:4px;padding:2px 0;max-width:calc(100% - 48px)}@media(max-width:1100px){.canvas-header{left:18px;right:18px;gap:7px}.view-label{display:flex;max-width:none}.view-tools{width:100%;justify-content:flex-start}.tool-button{font-size:12px}.detail-sequence{left:18px;bottom:67px}}@media(max-width:560px){.view-tools{gap:4px}#underside{display:none}.canvas-header{top:12px}.view-label{max-width:100%}.scene{min-height:420px}.detail-sequence{left:14px;bottom:72px;padding:5px 7px;gap:5px}.detail-sequence span{padding:5px}.view-caption{left:16px;right:16px;max-width:100%;line-height:1.5}}