/* Entry, preview, and assembly are separate stages of the same workspace. */
body.engine{height:100dvh;min-width:320px;display:flex;flex-direction:column;overflow:auto;background:#fff}
.engine .topbar{height:auto;min-height:70px;flex-shrink:0;padding:14px 30px;gap:20px;background:#fff}
.engine .brand{flex-shrink:0;white-space:nowrap;gap:7px;letter-spacing:-1px}
.engine .brand-symbol{color:var(--blue);font-size:36px;font-weight:500;line-height:.8}
.engine .header-actions{display:flex;align-items:center;gap:22px;min-width:0;flex-wrap:wrap;justify-content:flex-end}
.engine .example-link{font-size:13px;color:#6b7586;white-space:nowrap}
.engine .example-link:hover{color:var(--blue)}
.engine .example-link span{margin-left:4px;color:#95a0b2}
.engine .change-manual{font-weight:500;font-size:13px;padding:9px 12px}
.engine .guide-menu{position:relative}
.engine .guide-menu>summary{list-style:none;display:grid;place-items:center;width:34px;height:34px;border:1px solid transparent;border-radius:7px;font-size:16px;letter-spacing:2px;color:#778296;cursor:pointer}
.engine .guide-menu>summary::-webkit-details-marker{display:none}
.engine .guide-menu>summary:hover,.engine .guide-menu[open]>summary{background:#f5f7fb;border-color:#e3e8f1}
.engine .guide-menu>summary:focus-visible{outline:3px solid #7190ff;outline-offset:3px}
.engine .guide-menu-items{position:absolute;z-index:15;top:calc(100% + 8px);right:0;width:205px;padding:6px;border:1px solid #e1e6ef;border-radius:10px;background:#fff;box-shadow:0 10px 30px #273a6220}
.engine .guide-menu-items>label,.engine .guide-menu-items>button{display:block;width:100%;padding:11px 12px;border-radius:6px;text-align:left;font-size:13px;font-weight:500;white-space:nowrap}
.engine .guide-menu-items>label:hover,.engine .guide-menu-items>button:not(:disabled):hover{background:#f2f5fc}
.file-button{position:relative;cursor:pointer}
.file-button input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}
.file-button:focus-within{outline:3px solid #7190ff;outline-offset:3px}
.engine .file-button:has(input:disabled){cursor:default;opacity:.45}
.engine .text-link{font:inherit;font-size:13px;color:var(--blue);cursor:pointer}
.engine .source-screen{width:min(1040px,100%);padding:64px 38px 48px;margin:auto;flex:1;display:flex;flex-direction:column;justify-content:center;min-height:450px}
.engine .source-hero{margin-bottom:46px}
.engine .source-hero .source-intro{text-align:center;margin:0 auto;max-width:820px}
.engine .source-hero .source-intro h1{font-size:clamp(36px,5.3vw,58px);line-height:1.08;font-weight:550;letter-spacing:-2.2px;max-width:100%;margin:20px auto 22px;text-wrap:balance}
.engine .source-hero .source-intro p{font-size:17px;line-height:1.65;max-width:60ch;margin:0 auto;text-wrap:pretty}
.engine .source-logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:30px;font-size:clamp(42px,5.5vw,60px);font-weight:700;letter-spacing:-2.3px;line-height:1}
.engine .source-logo>span{color:var(--blue);font-size:1.25em;font-weight:500;line-height:.8;letter-spacing:0}
.engine .source-intro h1{display:block;font-size:clamp(32px,4.5vw,43px);font-weight:550;letter-spacing:-1.55px;line-height:1.18;margin:13px 0 14px}
.engine .source-intro p{font-size:16px;line-height:1.6;color:#7b8494}
.engine .source-choices{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.engine .source-choice{position:relative;min-height:215px;border:1px solid #dfe5ef;border-radius:14px;background:#fff;box-shadow:0 4px 16px #293d6410;transition:border-color .15s,background .15s,box-shadow .15s}
.engine .source-choice:hover{border-color:#a9baf5;background:#fcfdff;box-shadow:0 6px 22px #293d6415}
.engine .source-choice-icon{position:absolute;top:26px;left:26px;display:grid;place-items:center;width:43px;height:43px;border-radius:11px;background:#f0f4ff;color:#4565dd;pointer-events:none}
.engine .source-choice-icon svg{width:23px;height:23px;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.engine .source-upload{display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-end;padding:93px 26px 27px;gap:10px}
.engine .source-choice-title{display:block;font-size:18px;font-weight:550;line-height:1.35;letter-spacing:-.35px;color:#263144}
.engine .source-choice-description{display:block;font-size:14px;font-weight:400;line-height:1.55;letter-spacing:0;color:#7d8798;white-space:normal}
.engine .source-search>.library-launch{position:relative;width:100%;height:100%;min-height:213px;border:0;border-radius:14px;background:transparent;padding:93px 26px 27px;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-end;gap:10px;text-align:left;font-size:18px;font-weight:550;line-height:1.35;letter-spacing:-.35px;color:#263144;white-space:normal}
.engine .source-search>.library-launch:disabled{opacity:.4}
.engine .source-search>.library-launch[data-library-pending]{opacity:1;cursor:wait}
.engine .source-search:focus-within{outline:3px solid #7190ff;outline-offset:3px}
.engine .source-search>.library-launch:focus-visible{outline:0}
.engine .source-resume{align-self:center;margin-top:19px;padding:6px 8px;font-size:13px}
.engine .source-resume span{margin-left:7px}
.engine .source-footnote{text-align:center;font-size:14px;line-height:1.6;color:#8490a2;margin:24px 0 0}
.engine #photo-intake>.photo-launcher{display:none}
.engine .build-shell{display:flex;flex-direction:column;flex:1;min-height:0}
.engine .projectbar{height:auto;min-height:85px;flex-shrink:0;padding:17px 30px;gap:24px;align-items:center}
.engine .projectbar>div:first-child{min-width:0}
.engine .projectbar h1{font-size:25px;line-height:1.35;overflow-wrap:anywhere;margin-top:7px;flex-wrap:wrap;gap:10px}
.engine .projectbar .eyebrow{overflow-wrap:anywhere;font-size:11px;letter-spacing:1.3px;line-height:1.5}
.engine .project-meta{font-size:12px;flex-shrink:0}
.engine .guide-tag{white-space:nowrap}
.engine .conversion-bar{padding:15px 30px;display:flex;justify-content:space-between;gap:24px;align-items:center;border-bottom:1px solid var(--line);background:#f7f9ff;flex-shrink:0}
.engine .conversion-bar strong{font-size:14px;line-height:1.5;font-weight:550;overflow-wrap:anywhere}
.engine .conversion-bar p{font-size:13px;line-height:1.7;color:#6b7890;margin-top:6px;max-width:850px}
.engine .conversion-heading,.engine .conversion-eyebrow,.engine .conversion-note{display:none}
.engine .conversion-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}
.engine .conversion-bar.error{background:#fff6f0}
.engine .conversion-bar.error #conversion-status{color:#984b2b}
.engine .conversion-bar.busy{background:#f1f5ff}
.engine .conversion-bar.busy #conversion-title::after{content:' …';animation:pulse 1.5s infinite}
.engine .conversion-bar>div:first-child{min-width:0;width:100%}
.engine .conversion-progress{width:100%;max-width:480px;margin-top:25px}
.engine .conversion-progress-meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:14px;line-height:1.5;color:#344b78}
.engine .conversion-elapsed{font-variant-numeric:tabular-nums;color:#758196}
.engine .conversion-progress progress{display:block;width:100%;height:9px;margin:12px 0 15px;border:0;border-radius:8px;overflow:hidden;background:#e3e9f5;accent-color:var(--blue)}
.engine .conversion-progress progress::-webkit-progress-bar{background:#e3e9f5;border-radius:8px}
.engine .conversion-progress progress::-webkit-progress-value{background:var(--blue);border-radius:8px;transition:width .3s}
.engine .conversion-progress progress::-moz-progress-bar{background:var(--blue);border-radius:8px}
.engine .conversion-stages{list-style:none;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px;margin:0;padding:0;font-size:14px;line-height:1.4;color:#7e899c}
.engine .conversion-stages li::before{content:'';display:block;width:7px;height:7px;border-radius:50%;margin-bottom:8px;background:#d7deeb}
.engine .conversion-stages li[data-state="done"]{color:#566d99}
.engine .conversion-stages li[data-state="done"]::before{background:#768ebd}
.engine .conversion-stages li[data-state="active"]{color:#294ddd;font-weight:600}
.engine .conversion-stages li[data-state="active"]::before{background:#3456e9;box-shadow:0 0 0 4px #3456e918;animation:pulse 1.5s infinite}
.engine .conversion-bar .conversion-wait,.engine .conversion-bar .conversion-contact{font-size:14px;line-height:1.5;margin-top:17px;color:#697991}
.engine .conversion-bar .conversion-contact{margin-top:8px;color:#7e899c}
@media(prefers-reduced-motion:reduce){.engine .conversion-stages li[data-state="active"]::before,.engine .conversion-bar.busy #conversion-title::after{animation:none}.engine .conversion-progress progress::-webkit-progress-value{transition:none}}
.engine .workspace{height:auto;min-height:560px;flex:1;grid-template-columns:210px minmax(300px,1fr) 300px}
.engine .scene{min-height:300px}
.engine .viewer-panel{min-height:0}
.engine .instruction{min-height:0;max-height:28dvh;overflow:auto;flex-shrink:0}
.engine .instruction p{max-height:none;overflow:visible}
.engine .player{flex-shrink:0}
.engine .step-review{display:flex;align-items:center;gap:14px;margin-top:14px}
.engine .step-review span{font-size:12px;color:#7d8797}
.engine .source-note details{font-size:13px}
.engine .source-note summary{cursor:pointer;color:#3f4a5c;font-weight:600}
.engine .part-row{display:flex;align-items:center;gap:7px;text-align:left;padding:9px 0;width:100%;font-size:13px;border-bottom:1px solid var(--line)}
.engine .part-swatch{height:10px;width:10px;border-radius:3px;flex-shrink:0;border:1px solid #0001}
.engine .part-row small{color:#8490a2}
.engine .manual-panel{overflow-wrap:anywhere;display:block}
.engine .manual-paper canvas{display:block;width:100%;height:auto}
.engine .view-caption,.engine .canvas-header{z-index:2}
.engine .step-item.checked .step-number{border-color:#6c88ca}
.engine .empty-scene{position:absolute;inset:0;z-index:1;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;gap:16px;padding:28px 20px;background:#f6f7f9}
.engine .empty-mark{font-size:54px;line-height:1;color:#3456e9}
.engine .empty-scene h2{font-size:28px;font-weight:550;letter-spacing:-.8px}
.engine .empty-scene p{color:#707c8e;font-size:15px;line-height:1.7;max-width:360px}
.engine .empty-note{padding:24px 18px;font-size:14px;line-height:1.7;color:#8490a2}
.engine .scene:has(.empty-scene:not([hidden])){min-height:350px}
.engine .scene:has(.empty-scene:not([hidden])) .canvas-header,.engine .scene:has(.empty-scene:not([hidden])) .view-caption{display:none}
.engine dialog label{display:flex;flex-direction:column;gap:7px;margin:14px 0;font-size:14px}
.engine dialog input,.engine dialog textarea,.engine dialog select{font:inherit;font-size:16px;padding:10px;border:1px solid #d7dfea;border-radius:6px;width:100%;background:white;color:#253044}
.engine dialog p{font-size:14px;margin:16px 0}
.engine #page-dialog{width:min(800px,95vw)}
.engine #large-page{width:100%;display:block}
.engine .photo-dialog .file-button input{padding:0;border:0;opacity:0}
.engine .photo-dialog .photo-add-actions label{flex-direction:row;margin:0}

/* Start with two choices. Reveal the source preview only when a manual is ready. */
.engine[data-state="empty"] .change-manual,.engine[data-state="empty"] .projectbar,.engine[data-state="empty"] .workspace{display:none}
.engine[data-state="empty"] .build-shell{flex:0}
.engine[data-state="empty"] .conversion-bar{display:none}
.engine[data-state="empty"] .conversion-bar:is(.error,.busy){display:block;max-width:800px;width:calc(100% - 60px);margin:0 auto 30px;border:1px solid #edd8ca;border-radius:9px;padding:15px 18px}
.engine[data-state="empty"] .conversion-bar strong,.engine[data-state="empty"] .conversion-actions{display:none}
.engine[data-state="empty"] .conversion-bar p{margin:0}
.engine:not([data-state="empty"]) .source-screen{display:none}
.engine:is([data-state="ready"],[data-state="converting"]) .build-shell{display:grid;grid-template-columns:minmax(320px,1.15fr) minmax(290px,.85fr);grid-template-rows:auto 1fr;max-width:1160px;width:100%;margin:0 auto;padding:0 30px 34px;gap:0 46px;flex:1;min-height:620px}
.engine:is([data-state="ready"],[data-state="converting"]) .projectbar{grid-column:1/-1;padding:26px 0 24px;border:0;min-height:100px}
.engine:is([data-state="ready"],[data-state="converting"]) .projectbar h1{font-size:25px}
.engine:is([data-state="ready"],[data-state="converting"]) .guide-tag,.engine:is([data-state="ready"],[data-state="converting"]) .project-meta{display:none}
.engine:is([data-state="ready"],[data-state="converting"]) .workspace{display:block;grid-column:1;grid-row:2;min-height:0;height:auto;background:#f5f7fa;border:1px solid #e6eaf1;border-radius:13px;overflow:hidden}
.engine:is([data-state="ready"],[data-state="converting"]) .steps-panel,.engine:is([data-state="ready"],[data-state="converting"]) .viewer-panel,.engine:is([data-state="ready"],[data-state="converting"]) .source-note,.engine:is([data-state="ready"],[data-state="converting"]) #relink{display:none}
.engine:is([data-state="ready"],[data-state="converting"]) .manual-panel{height:100%;background:transparent;border:0;overflow:visible;padding:0 0 17px}
.engine:is([data-state="ready"],[data-state="converting"]) .manual-panel .panel-heading{padding:18px 22px}
.engine:is([data-state="ready"],[data-state="converting"]) .manual-paper{max-width:340px;width:calc(100% - 44px);min-height:0;margin:0 auto;border:1px solid #e0e4ec;box-shadow:0 3px 14px #2430470b}
.engine:is([data-state="ready"],[data-state="converting"]) .manual-pagination{margin-top:14px;color:#6b7890}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-bar{grid-column:2;grid-row:2;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:24px;background:transparent;border:0;padding:28px 0}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-heading{display:block;font-size:30px;font-weight:550;line-height:1.2;letter-spacing:-1px;margin:12px 0 25px;max-width:300px}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-eyebrow{display:block;font-size:10px;letter-spacing:1.6px;color:#8490a6}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-bar strong{display:block;font-size:13px;font-weight:550;color:#52627a}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-bar #conversion-status{font-size:14px;line-height:1.7;margin-top:10px;color:#7b879b}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-actions{flex-wrap:wrap;gap:10px}
.engine:is([data-state="ready"],[data-state="converting"]) #convert{padding:13px 18px;gap:24px;border-radius:8px}
.engine:is([data-state="ready"],[data-state="converting"]) .conversion-note{display:block;font-size:11px;line-height:1.65;margin:0;max-width:320px;color:#99a1af}
.engine[data-state="converting"] .conversion-heading{color:#3456c9}
.engine[data-state="guide"] .conversion-bar:not(.error):not(.busy){display:none}
.engine[data-state="guide"] .conversion-actions{display:none}
@keyframes pulse{50%{opacity:.3}}

/* A short side panel scrolls instead of squeezing the scene beneath its controls. */
@media(min-width:1500px){.engine .workspace{grid-template-columns:235px minmax(430px,1fr) 345px}}
@media(max-width:1100px){.engine .workspace{grid-template-columns:185px minmax(280px,1fr) 255px}.engine .guide-tag{display:none}.engine .projectbar h1{font-size:22px}.engine .project-meta{display:none}.engine .source-intro h1{font-size:38px}}
@media(max-width:850px){
 .engine .topbar{padding:14px 22px;gap:12px;flex-wrap:wrap}
 .engine .header-actions{gap:14px}
 .engine .workspace{grid-template-columns:155px minmax(280px,1fr);min-height:0}
 .engine .viewer-panel{min-height:690px}
 .engine .steps-panel{max-height:690px}
 .engine .scene{min-height:350px}
 .engine .instruction{max-height:none}
 .engine .manual-panel{display:block}
 .engine .manual-paper{max-width:420px;margin:auto}
 .engine .source-note{max-width:600px;margin:25px auto}
 .engine .conversion-bar{align-items:flex-start;padding:15px 22px}
 .engine:is([data-state="ready"],[data-state="converting"]) .build-shell{gap:0 26px;padding:0 22px 28px;grid-template-columns:minmax(270px,1fr) minmax(235px,.85fr)}
 .engine:is([data-state="ready"],[data-state="converting"]) .conversion-heading{font-size:26px}
 .engine:is([data-state="ready"],[data-state="converting"]) #convert{gap:12px;padding:13px 15px;font-size:13px}
}
@media(max-height:680px) and (min-width:641px){
 .engine .source-screen{padding-top:30px;padding-bottom:28px;min-height:390px}
 .engine .source-intro{margin-bottom:24px}
 .engine .source-intro h1{font-size:36px}
 .engine .source-choice,.engine .source-search>.library-launch{min-height:185px}
 .engine .source-upload,.engine .source-search>.library-launch{padding-top:78px;padding-bottom:21px}
 .engine .source-choice-icon{top:21px;width:36px;height:36px;border-radius:9px}
 .engine .source-footnote{margin-top:19px}
}
@media(max-width:640px){
 .engine .source-hero{margin-bottom:28px}
 .engine .source-hero .source-intro h1{letter-spacing:-1.4px;max-width:100%;margin:16px auto}
 .engine .source-hero .source-intro p{font-size:16px}
 .engine .topbar{padding:13px 18px;min-height:64px}
 .engine .brand{font-size:24px}
 .engine .brand-symbol{font-size:31px}
 .engine .header-actions{gap:10px}
 .engine .example-link{font-size:12px}
 .engine:not([data-state="empty"]) .example-link{display:none}
 .engine .change-manual{font-size:12px;padding:8px 10px}
 .engine .source-screen{padding:36px 22px 30px;min-height:0;justify-content:flex-start}
 .engine .source-intro{margin-bottom:27px}
 .engine .source-intro h1{font-size:34px;letter-spacing:-1.2px}
 .engine .source-intro p{font-size:14px}
 .engine .source-choices{grid-template-columns:1fr;gap:14px}
 .engine .source-choice{min-height:165px}
 .engine .source-search>.library-launch{min-height:163px;padding:79px 22px 22px;font-size:18px}
 .engine .source-upload{padding:79px 22px 22px;gap:8px}
 .engine .source-choice-icon{top:22px;left:22px;width:35px;height:35px;border-radius:9px}
 .engine .source-choice-icon svg{width:21px;height:21px}
 .engine .source-choice-title{font-size:18px}
 .engine .source-choice-description{font-size:13px}
 .engine .source-footnote{font-size:14px;max-width:none;margin:22px 0 0}
 .engine .projectbar{padding:20px 18px;min-height:0}
 .engine .projectbar h1{font-size:22px}
 .engine .conversion-bar{flex-direction:column;gap:12px;padding:16px 18px}
 .engine .conversion-actions{width:100%}
 .engine[data-state="empty"] .conversion-bar:is(.error,.busy){width:calc(100% - 44px);margin-bottom:22px}
 body.engine:is([data-state="ready"],[data-state="converting"]){height:auto;min-height:100dvh}
 .engine:is([data-state="ready"],[data-state="converting"]) .build-shell{display:flex;flex-direction:column;flex:0 0 auto;min-height:0;padding:0 18px 26px;gap:0}
 .engine:is([data-state="ready"],[data-state="converting"]) .projectbar{order:0;padding:22px 0 18px;min-height:0}
 .engine:is([data-state="ready"],[data-state="converting"]) .projectbar h1{font-size:23px}
 .engine:is([data-state="ready"],[data-state="converting"]) .workspace{order:1;flex:0 0 auto}
 .engine:is([data-state="ready"],[data-state="converting"]) .manual-panel{height:auto;padding-bottom:10px}
 .engine:is([data-state="ready"],[data-state="converting"]) .manual-panel .panel-heading{padding:12px 16px}
 .engine:is([data-state="ready"],[data-state="converting"]) .conversion-bar{order:2;padding:27px 3px 0;gap:19px}
 .engine:is([data-state="ready"],[data-state="converting"]) .conversion-heading{font-size:27px;max-width:none;margin:9px 0 18px}
 .engine:is([data-state="ready"],[data-state="converting"]) .conversion-eyebrow{display:none}
 .engine:is([data-state="ready"],[data-state="converting"]) .manual-paper{width:fit-content;max-width:calc(100% - 32px)}
 .engine:is([data-state="ready"],[data-state="converting"]) .manual-paper canvas{width:auto;height:auto;max-width:min(58vw,220px);max-height:28svh;object-fit:contain;margin:auto}
 .engine:is([data-state="ready"],[data-state="converting"]) .manual-pagination{margin-top:8px;gap:16px;font-size:14px}
 .engine:is([data-state="ready"],[data-state="converting"]) .manual-pagination .icon-button{width:44px;height:44px}
 .engine:is([data-state="ready"],[data-state="converting"]) #convert{flex:1;font-size:14px;padding:14px 16px}
 .engine:is([data-state="ready"],[data-state="converting"]) .conversion-note{max-width:none}
}
@media(max-width:560px){
 .engine .workspace{display:flex;flex-direction:column}
 .engine .viewer-panel{min-height:700px}
 .engine .scene{min-height:360px}
 .engine .instruction{min-height:0;padding:21px 18px}
 .engine .instruction h2{font-size:21px}
 .engine .player{padding:15px 12px}
 .engine .empty-scene h2{font-size:26px}
 .engine .canvas-header{left:16px;right:16px}
}
@media(prefers-reduced-motion:reduce){.engine .conversion-bar.busy #conversion-title::after{animation:none}}

.engine:is([data-state="ready"],[data-state="converting"]) .conversion-bar.error #conversion-status{color:#984b2b}

/* The demo remains available in the header before and after a guide opens. */
.engine .demo-button{font-size:14px;padding:9px 12px}
.engine .sidebar-demo{font-size:14px;margin-bottom:12px;text-align:left}
@media(max-width:640px){
 .engine .source-hero{margin-bottom:28px}
 .engine .source-hero .source-intro h1{letter-spacing:-1.4px;max-width:100%;margin:16px auto}
 .engine .source-hero .source-intro p{font-size:16px}
.engine .topbar{flex-wrap:wrap}.engine .header-actions{flex:1}.engine .demo-button{padding:8px 10px}}

.engine .guide-scan{display:block;padding:0;background:#f0f4ff;border-bottom:1px solid #dce4fa;flex-shrink:0}
.engine .guide-scan .eyebrow{font-size:10px;letter-spacing:1.4px;color:#526bba}
.engine .guide-scan h2{font-size:20px;font-weight:550;letter-spacing:-.4px;margin:7px 0}
.engine .guide-scan p{font-size:14px;line-height:1.6;color:#65748e}
.engine .guide-scan .button{flex-shrink:0}
.engine .guide-scan-details>summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 30px;cursor:pointer;list-style:none;min-height:48px}
.engine .guide-scan-details>summary::-webkit-details-marker{display:none}
.engine .guide-scan-details>summary:focus-visible{outline:3px solid #7190ff;outline-offset:-3px}
.engine .guide-scan-details .eyebrow{display:block;margin-bottom:7px}
.engine .guide-scan-details h2{margin:0}
.engine .guide-scan-disclosure{font-size:14px;white-space:nowrap;color:#526bba}
.engine .guide-scan-details[open] .when-closed,.engine .guide-scan-details:not([open]) .when-open,.engine .guide-scan-details:not([open]) .eyebrow{display:none}
.engine .guide-scan-details:not([open]) h2{font-size:14px;letter-spacing:0}
.engine .guide-scan-body{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 30px 18px}
.engine #parts-scan-dialog{width:min(1440px,calc(100vw - 32px));height:calc(100dvh - 32px);max-height:calc(100dvh - 32px);padding:0;overflow:hidden}
.engine #parts-scan-dialog[open]{display:flex;flex-direction:column}
.engine .parts-scan-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 24px;border-bottom:1px solid var(--line);flex-shrink:0}
.engine .parts-scan-toolbar strong{font-size:13px;font-weight:550;color:#65748e}
.engine #parts-scan-content{flex:1;min-height:0}
.engine #parts-scan-content iframe{display:block;width:100%;height:100%;border:0}
@media(max-width:640px){
 .engine .source-hero{margin-bottom:28px}
 .engine .source-hero .source-intro h1{letter-spacing:-1.4px;max-width:100%;margin:16px auto}
 .engine .source-hero .source-intro p{font-size:16px}
 .engine .guide-scan-details>summary{padding:14px 18px}
 .engine .guide-scan-body{padding:0 18px 18px;align-items:flex-start;flex-direction:column;gap:12px}
 .engine #parts-scan-dialog{width:100vw;max-width:100vw;height:100dvh;max-height:100dvh;border:0;border-radius:0}
 .engine .parts-scan-toolbar{padding:13px 18px;flex-wrap:wrap;gap:10px}
 .engine .parts-scan-toolbar .button{font-size:12px}
}

/* Keep voice beside the current build without shrinking away its controls. */
.engine .copilot-panel{flex-shrink:0;border-bottom:1px solid var(--line)}
.engine .copilot-heading h2{margin:0;font-size:22px}
.engine .copilot-panel p{margin-top:8px}

/* Keep assembly playback reachable while the manual and instructions scroll. */
@media(max-width:850px){
 body.engine[data-state="guide"]{height:auto;min-height:100dvh;padding-bottom:calc(9rem + env(safe-area-inset-bottom,0px))}
 .engine[data-state="guide"] :is(.build-shell,.workspace,.viewer-panel){flex:0 0 auto;min-height:0}
 .engine[data-state="guide"] .scene{flex:none;height:clamp(280px,45svh,420px);min-height:280px}
 .engine[data-state="guide"] .player{
  position:fixed;inset:auto 0 0;z-index:10;
  display:grid;grid-template-columns:44px 44px 44px minmax(0,1fr);gap:4px 8px;
  min-height:0;padding:10px max(12px,env(safe-area-inset-right,0px)) calc(10px + env(safe-area-inset-bottom,0px)) max(12px,env(safe-area-inset-left,0px));
  background:#fff;border-top:1px solid #dce1e9;box-shadow:0 -4px 18px #20253012;
 }
 .engine[data-state="guide"] .player .timeline{grid-column:1/-1;grid-row:1;min-width:0}
 .engine[data-state="guide"] .player .timeline input{height:24px;margin:0 0 4px}
 .engine[data-state="guide"] .player .timeline-labels{font-size:12px;line-height:1.5;gap:8px}
 .engine[data-state="guide"] .player .timeline-labels span:last-child{display:block}
 .engine[data-state="guide"] .player>button{grid-row:2;min-height:44px;height:auto}
 .engine[data-state="guide"] #prev{grid-column:1;width:44px}
 .engine[data-state="guide"] #play{grid-column:2;width:44px}
 .engine[data-state="guide"] #speed{grid-column:3;font-size:14px}
 .engine[data-state="guide"] #next{grid-column:4;min-width:0;max-width:none;white-space:normal;font-size:14px;line-height:1.4;padding:10px 12px}
}