:root{color-scheme:light;--ink:#223345;--muted:#697b8c;--line:#e1e7ed;--bg:#f4f6f9;--panel:#fff;--panel2:#f5f7fa;--accent:#285e91;--accent-soft:#eaf1f8;--accent-line:#b7cde0;--shadow:0 5px 22px #243f5710;--radius:12px}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;width:100%}
body{height:100dvh;display:flex;flex-direction:column;overflow:hidden;background:var(--bg);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC","Segoe UI",system-ui,sans-serif;font-size:13px;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums}
[hidden]{display:none!important}
button,input,select,summary,a{-webkit-tap-highlight-color:transparent}
button,input,select{font:inherit;color:inherit}
button,summary{cursor:pointer}
button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:36px;padding:7px 11px;border:1px solid var(--line);border-radius:8px;background:var(--panel);white-space:nowrap;transition:background-color .16s,border-color .16s,box-shadow .16s,transform .16s}
button:hover:not(:disabled){background:#f1f5f9;border-color:#bdcddb}
button:active:not(:disabled){transform:translateY(1px)}
button:disabled{opacity:.4;cursor:not-allowed}
button.on,button[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent);font-weight:600}
button.primary-button{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
button.primary-button:hover:not(:disabled){background:#204f7a;border-color:#204f7a}
button.soft-button{background:var(--accent-soft);border-color:transparent;color:var(--accent)}
button.danger{color:#a9473e}
button.danger:hover:not(:disabled){background:#fff2ef;border-color:#eac9c4}
:where(button,a,input,select,summary,[tabindex]):focus-visible{outline:3px solid #5893c5;outline-offset:3px}
input,select{min-width:0;padding:9px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;transition:border-color .16s}
input:hover,select:hover{border-color:#bdcddb}
input[type=checkbox]{width:14px;height:14px;accent-color:var(--accent);flex:none}
input[type=number]{font-variant-numeric:tabular-nums}
summary{list-style:none;display:flex;align-items:center;gap:7px}
summary::-webkit-details-marker{display:none}
kbd{font:10px "Segoe UI",sans-serif;color:var(--muted);background:#edf1f5;border:1px solid #e0e6ec;border-radius:4px;padding:1px 4px;white-space:nowrap}
.icon{height:18px;width:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}
.icon-sprite{position:absolute;width:0;height:0;overflow:hidden;pointer-events:none}
.icon-button{width:36px;padding:7px;flex:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.skip-link{position:fixed;top:8px;left:12px;transform:translateY(-150%);z-index:80;background:#fff;padding:12px;color:var(--accent);border-radius:8px}
.skip-link:focus{transform:translateY(0)}
.app-header{height:72px;flex:none;display:flex;align-items:center;gap:24px;padding:0 22px;background:var(--panel);border-bottom:1px solid var(--line);z-index:30}
.brand{display:flex;align-items:center;gap:10px;flex:none;text-decoration:none;color:inherit}
.brand-mark{width:38px;height:38px;display:grid;place-items:center;background:var(--accent);border-radius:11px;color:#fff}
.brand-mark .icon{width:25px;height:25px;stroke-width:1.65}
.brand-text b{display:block;font-size:16px;letter-spacing:.5px;font-weight:700}
.brand-text>span{display:block;margin-top:3px;font-size:10px;color:var(--muted)}
.mode-switch{display:flex;flex:none;gap:3px;padding:4px;background:var(--panel2);border-radius:10px}
.mode-switch a{text-decoration:none;white-space:nowrap;padding:7px 12px;border-radius:7px;font-size:12px;color:var(--muted)}
.mode-switch a:hover{color:var(--accent)}
.mode-switch a.on{color:var(--accent);background:#fff;box-shadow:0 1px 4px #243f5712;font-weight:600}
.top-actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.top-actions>button{font-size:12px;min-height:36px}
.history-actions{display:flex;gap:2px;margin-right:4px;padding-right:12px;border-right:1px solid var(--line)}
.history-actions button{border-color:transparent;background:transparent}
.work-menu{position:relative}
.work-menu>summary{min-height:36px;padding:7px 9px;font-size:12px;border-radius:8px}
.work-menu>summary:hover,.work-menu[open]>summary{background:var(--panel2)}
.work-menu>summary .icon:last-child{width:12px;height:12px}
.work-menu-content{position:absolute;top:calc(100% + 12px);right:0;min-width:238px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px;box-shadow:0 12px 40px #243f5724;z-index:35}
.work-menu-content>p{padding:8px 9px 10px;color:var(--muted);font-size:11px}
.work-menu-content button{width:100%;justify-content:flex-start;border:0;min-height:40px;background:transparent;font-size:12px}
.work-menu-content button kbd,.work-menu-content button>span{margin-left:auto;font-size:10px}
.menu-divider{height:1px;background:var(--line);margin:6px}
.workspace{display:flex;flex:1;position:relative;min-height:0;isolation:isolate}
aside.library{width:280px;flex:none;display:flex;flex-direction:column;min-height:0;background:var(--panel);border-right:1px solid var(--line);z-index:15}
.panel-heading{display:flex;align-items:center;justify-content:space-between;padding:22px 18px 16px}
.section-kicker{font-size:11px;line-height:1.6;color:var(--muted);letter-spacing:.5px;margin-bottom:5px}
.panel-heading h1{font-size:20px;line-height:1.4;letter-spacing:-.4px;display:flex;align-items:center;gap:12px}
#libraryCount{font-size:10px;font-weight:400;letter-spacing:0;color:var(--muted)}
.library-search{padding:0 16px 16px}
.search-field{display:flex;align-items:center;gap:8px;padding:0 10px;background:var(--panel2);border:1px solid transparent;border-radius:8px}
.search-field:focus-within{border-color:var(--accent-line);background:#fff}
.search-field>.icon{color:var(--muted);width:16px;height:16px}
.search-field input{background:transparent;border:0;padding:10px 0;width:100%;font-size:12px;outline-offset:2px}
.category-chips{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;margin-top:12px}
.category-chips button{font-size:11px;min-height:30px;border-color:transparent;background:var(--panel2);padding:5px}
.category-chips button[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent-line)}
.palette-heading{padding:0 18px 9px;display:flex;justify-content:space-between;font-size:11px;font-weight:600}
#colorLabel{font-size:10px;font-weight:400;color:var(--muted)}
.color-row{display:grid;grid-template-columns:repeat(8,1fr);gap:7px;padding:0 18px 17px;border-bottom:1px solid var(--line)}
.color-dot{position:relative;min-height:0;width:100%;aspect-ratio:1;border-radius:6px;padding:0;border:1px solid #21354724;box-shadow:inset 0 0 0 1px #ffffff12}
.color-dot.on{box-shadow:0 0 0 2px #fff,0 0 0 4px var(--accent);border-color:transparent}
.color-dot.on::after{content:'';width:8px;height:5px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;transform:translate(-50%,-65%) rotate(-45deg);position:absolute;left:50%;top:50%}
.transparent-badge{position:absolute;right:-3px;bottom:-3px;background:#fff;border:1px solid var(--line);border-radius:3px;font-size:8px;color:var(--muted);padding:0 1px;line-height:11px}
#partGroups{flex:1;overflow-y:auto;overscroll-behavior:contain;padding:16px 12px 20px;scrollbar-gutter:stable}
.part-sec{margin-bottom:20px}
.part-sec-head{display:flex;align-items:center;justify-content:space-between;margin:0 4px 10px;font-size:11px;font-weight:600;color:var(--muted)}
.part-sec-head span{font-size:10px;font-weight:400;color:#8996a3}
.part-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}
.part-btn{flex-direction:column;min-width:0;min-height:99px;padding:7px 3px 8px;gap:3px;background:var(--panel2);border:1px solid transparent;border-radius:9px;overflow:hidden;cursor:grab;touch-action:pan-y}
.part-btn:hover:not(:disabled){background:#edf3f9;border-color:var(--accent-line);box-shadow:0 3px 9px #243f570c}
.part-btn:active:not(:disabled){cursor:grabbing}
.part-btn.active{background:var(--accent-soft);border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.part-btn img{display:block;width:100%;height:53px;object-fit:contain;pointer-events:none}
.pb-name{max-width:100%;font-size:10px;text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.5}
.pb-number{font-size:9px;line-height:1.2;color:var(--muted)}
.part-unavailable{font-size:8px;color:var(--muted);line-height:1.3}
.library-footer{display:flex;align-items:center;justify-content:center;gap:7px;padding:12px;border-top:1px solid var(--line);font-size:10px;color:var(--muted);background:#fff}
.library-footer .icon{width:13px;height:13px}
#partsEmpty{padding:30px 8px;text-align:center}
#partsEmpty strong{font-size:13px}
#partsEmpty p{font-size:11px;color:var(--muted);line-height:1.8;margin:10px 0 15px}
#partsEmpty button{font-size:11px}
.stage{flex:1;position:relative;min-width:0;overflow:hidden;background:#eef2f6}
#canvas3d{position:absolute;inset:0;display:block;width:100%;height:100%;outline-offset:-4px}
.stage-controls{position:absolute;left:16px;right:84px;top:16px;z-index:5;display:flex;flex-direction:column;align-items:flex-start;gap:9px;pointer-events:none}
.stage-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;max-width:100%;pointer-events:none}
.stage-toolbar>*{pointer-events:auto}
.tool-modes,.rotation-tools{display:flex;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:4px;box-shadow:var(--shadow);gap:3px}
.tool-modes button,.rotation-tools button{font-size:12px;min-height:32px;border-color:transparent;padding:6px 8px}
.tool-modes button.on{background:var(--accent-soft);color:var(--accent)}
.tool-modes button kbd{margin-left:3px;font-size:9px}
.rotation-tools select{font-size:11px;padding:6px 3px;border-color:transparent;width:55px;min-height:32px;background:var(--panel2)}
.rotation-tools button{gap:4px}
#rotLabel{font-size:10px;color:var(--muted);min-width:18px}
#renderQuality{font-size:11px;min-height:42px;width:94px;padding:7px;box-shadow:var(--shadow)}
.placement-options{position:relative;display:flex;align-items:center;flex-wrap:wrap;max-width:100%;gap:9px;padding:8px 10px;background:#ffffffed;border:1px solid #dbe4ec;border-radius:9px;font-size:11px;pointer-events:auto}
.placement-options label,.advanced-placement label{display:flex;align-items:center;gap:6px}
#placementState{color:#346b63;font-size:10px;font-weight:600;line-height:1.8}
#placementState[data-locked=true]{color:#98652b}
#placementAdvanced>summary{color:var(--muted);font-size:11px}
#placementAdvanced>summary .icon{width:12px;height:12px}
.advanced-placement{position:absolute;left:0;top:calc(100% + 8px);width:306px;max-width:100%;display:flex;flex-direction:column;align-items:flex-start;gap:13px;background:#fff;padding:16px;border:1px solid var(--line);border-radius:12px;box-shadow:0 9px 25px #243f5722}
.advanced-placement p{font-size:11px;line-height:1.8;color:var(--muted)}
#placeLayer{width:64px;padding:5px}
#btnLockHeight{font-size:11px}
.view-presets{position:absolute;right:14px;top:16px;display:flex;flex-direction:column;align-items:center;gap:4px;padding:7px 5px;background:#ffffffef;border:1px solid var(--line);border-radius:11px;box-shadow:var(--shadow);z-index:5}
.view-presets>span{font-size:9px;color:var(--muted);padding:3px 0 6px}
.view-presets button{min-height:32px;width:44px;padding:5px;font-size:11px;background:transparent;border-color:transparent}
#btnResetView{border-top:1px solid var(--line);border-radius:0 0 5px 5px;margin-top:3px}
.stage-foot{position:absolute;bottom:0;left:0;right:0;padding:25px 20px 16px;background:linear-gradient(transparent,#f8fafce8 35%,#f8fafc);pointer-events:none;z-index:4}
.foot-row{display:flex;align-items:center;justify-content:space-between;gap:12px}
#selInfo{font-size:12px;font-weight:600;line-height:1.7}
#cursorInfo{font-size:10px;color:var(--muted);line-height:1.7}
#partCount{font-size:11px;color:var(--muted);white-space:nowrap;background:#ffffffa8;padding:6px 10px;border:1px solid #e1e7edab;border-radius:6px}
#emptyBuild{position:absolute;left:50%;top:49%;transform:translate(-50%,-50%);text-align:center;width:380px;max-width:85%;pointer-events:none}
.empty-mark{width:68px;height:68px;display:grid;place-items:center;background:#ffffffd9;border:1px solid #ffffff;border-radius:20px;color:var(--accent);box-shadow:var(--shadow);margin:0 auto 20px;transform:rotate(-7deg)}
.empty-mark .icon{width:35px;height:35px}
#emptyBuild strong{font-size:28px;letter-spacing:-1px;line-height:1.6;font-weight:650}
#emptyBuild>p:not(.section-kicker){font-size:13px;line-height:1.9;color:var(--muted);margin:12px 0 20px}
.empty-actions{display:flex;align-items:center;justify-content:center;gap:9px}
.empty-actions button{pointer-events:auto;font-size:12px;min-height:40px}
.empty-tip{display:block;font-size:10px;color:var(--muted);margin-top:21px}
#toast{position:absolute;top:178px;left:50%;transform:translate(-50%,-8px);max-width:85%;width:max-content;background:#263e51f2;color:#fff;border-radius:9px;padding:10px 16px;font-size:12px;line-height:1.7;box-shadow:0 5px 20px #243f5720;opacity:0;pointer-events:none;transition:transform .2s,opacity .2s;z-index:10}
#toast.show{transform:translate(-50%,0);opacity:1}
.inspector{width:272px;flex:none;display:flex;flex-direction:column;min-height:0;overflow-y:auto;overscroll-behavior:contain;background:var(--panel);border-left:1px solid var(--line);z-index:15}
.work-section{padding:22px 18px 18px}
.work-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.field-label{display:block;color:var(--muted);font-size:11px;margin-bottom:7px}
.work-heading .field-label{margin:0}
#workTitle{width:100%;font-size:15px;font-weight:600;padding:9px 10px;background:var(--panel2);border-color:transparent}
#workTitle:focus{background:#fff;border-color:var(--accent-line)}
#saveStatus{font-size:10px;line-height:1.8;color:var(--muted);margin-top:9px;display:flex;align-items:baseline;gap:6px}
#saveStatus::before{content:'';width:5px;height:5px;background:#57877c;border-radius:50%;flex:none;align-self:center}
#saveStatus[data-error=true]{color:#a9473e}
#saveStatus[data-error=true]::before{background:currentColor}
.inspector-tabs{display:flex;padding:0 16px;border-bottom:1px solid var(--line);gap:12px;flex:none}
.inspector-tabs button{flex:1;border:0;border-bottom:2px solid transparent;border-radius:0;font-size:12px;padding:10px 3px;min-height:42px;color:var(--muted);background:transparent}
.inspector-tabs button[aria-selected=true]{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
#stepTabCount{font-size:10px;background:var(--panel2);padding:1px 5px;border-radius:4px}
.inspector-section{padding:20px 18px}
.inspector-section h2{font-size:14px;line-height:1.7;font-weight:600}
.help-text{font-size:11px;color:var(--muted);line-height:1.8}
.selection-empty{padding:26px 0;text-align:center}
.selection-illustration{width:48px;height:48px;display:grid;place-items:center;border-radius:14px;background:var(--panel2);color:#879bad;margin:0 auto 17px}
.selection-illustration .icon{width:24px;height:24px}
.selection-empty>p{font-size:11px;color:var(--muted);line-height:1.9;margin:9px 0 25px}
.selection-empty ul{list-style:none;text-align:left;border-top:1px solid var(--line);padding-top:14px}
.selection-empty li{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--muted);padding:8px 0;gap:8px}
.selection-empty li>span{color:var(--ink);font-weight:500}
.selection-title{display:flex;align-items:center;gap:8px;margin-bottom:5px}
.selection-indicator{width:8px;height:8px;background:var(--accent);border-radius:3px}
#selectedName{font-size:15px}
#selectedMeta{font-size:10px}
.selection-actions{display:flex;gap:7px;margin:16px 0}
.selection-actions button{flex:1;font-size:11px;padding:7px 4px}
.height-control{padding:14px 12px;background:#edf4fa;border:1px solid #d8e5ef;border-radius:10px;margin-bottom:9px}
.height-control>span{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#45637d}
.height-control b{font-size:18px;color:var(--accent);font-weight:600}
.height-control>div{display:flex;gap:7px;margin-top:12px}
.height-control button{flex:1;min-height:39px;padding:7px 4px;font-size:12px;border-color:#c9dbe9;color:var(--accent)}
.height-control p{font-size:9px;color:#6a8196;margin-top:10px;line-height:1.7}
#btnSettle{width:100%;justify-content:space-between;font-size:12px;margin-bottom:16px}
.inspector-details{border-top:1px solid var(--line)}
.inspector-details>summary{justify-content:space-between;font-size:11px;min-height:44px;color:var(--muted)}
.inspector-details>summary .icon{width:12px;height:12px;transition:transform .16s}
.inspector-details[open]>summary .icon{transform:rotate(180deg)}
.coordinates{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin:0 0 10px}
.coordinates label{font-size:10px;color:var(--muted)}
.coordinates input{width:100%;padding:8px 5px;font-size:12px;margin-top:6px}
#btnApplyPosition,#btnApplyRotation{width:100%;font-size:11px;margin-bottom:12px}
.step-field-label{margin-top:17px}
#editStep{width:100%;font-size:11px}
.steps-heading{margin-bottom:20px}
.steps-heading p{margin-top:4px}
#stepHint{font-size:10px}
#buildSteps{display:flex;flex-direction:column;gap:6px;margin:12px 0 18px;max-height:360px;overflow:auto;overscroll-behavior:contain;padding-right:2px}
.build-step{min-height:42px;flex-shrink:0;justify-content:space-between;padding:10px 12px;font-size:12px;border-color:transparent;background:var(--panel2)}
.build-step b{font-weight:500}
.build-step span{font-size:10px;color:var(--muted)}
.build-step.on{border-color:var(--accent-line)}
#btnAddStep,#btnPreview{width:100%;min-height:39px;margin-top:8px;font-size:12px}
#btnAddStep .icon{width:15px;height:15px}
.preview-nav{display:flex;gap:7px;margin:12px 0}
.preview-nav button{flex:1;min-width:0;font-size:11px;padding:8px 3px}
.scope-note{font-size:9px;color:var(--muted);line-height:1.8;padding:18px;margin-top:auto}
.panel-access,.drawer-close{display:none}
.panel-scrim{position:absolute;inset:0;z-index:20;border:0;border-radius:0;background:#22334535;cursor:default}
.panel-scrim:hover:not(:disabled){background:#22334535}
.panels-hidden aside.library,.panels-hidden aside.inspector{display:none}
.immersive .app-header{height:56px}
.immersive .brand-text>span{display:none}
#examplesDialog{margin:auto;width:min(1000px,94vw);max-height:90dvh;overflow-y:auto;overscroll-behavior:contain;border:1px solid var(--line);border-radius:18px;background:#f6f8fb;padding:28px;color:var(--ink);box-shadow:0 24px 80px #152d4533}
#examplesDialog::backdrop{background:#20394f70;backdrop-filter:blur(3px)}
.examples-header{display:flex;align-items:center;justify-content:space-between;gap:14px}
.examples-header h2{font-size:27px;letter-spacing:-.7px;font-weight:650}
.examples-intro{font-size:12px;color:var(--muted);line-height:1.8;margin:14px 0 24px;max-width:65ch}
.example-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
button.example-card{display:block;white-space:normal;text-align:left;padding:0;overflow:hidden;border-radius:12px;background:#fff;border:1px solid #e2e8ef}
.example-card:hover:not(:disabled){border-color:var(--accent-line);background:#fff;box-shadow:0 5px 18px #243f5710;transform:translateY(-2px)}
.example-card img{width:100%;height:auto;aspect-ratio:8/5;display:block;object-fit:contain;background:#eef2f6}
.example-copy{padding:15px}
.example-copy h3{font-size:15px;margin-bottom:8px;font-weight:600}
.example-copy p{font-size:11px;line-height:1.8;color:var(--muted);margin-bottom:12px}
.example-meta{display:flex;justify-content:space-between;gap:5px;color:var(--accent);font-size:10px}
.example-challenge{border-top:1px solid var(--line);margin-top:12px;padding-top:10px;font-size:10px;line-height:1.8;color:var(--muted)}
.examples-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}
.examples-footer span{font-size:11px;line-height:1.8;color:var(--muted)}
.examples-footer button{font-size:12px;flex:none}
#loading{position:fixed;inset:0;display:none;place-items:center;background:#f4f6f9f5;z-index:60}
body.loading #loading{display:grid}
.loading-box{text-align:center;padding:24px}
.spinner{width:36px;height:36px;border-radius:50%;border:3px solid #dce5ee;border-top-color:var(--accent);margin:0 auto 18px;animation:spin .9s linear infinite}
#loadingText{font-size:13px;line-height:1.8;color:var(--muted)}
@keyframes spin{to{transform:rotate(360deg)}}
:where(#partGroups,.inspector,#buildSteps,#examplesDialog){scrollbar-width:thin;scrollbar-color:#c6d1db transparent}
@media(max-width:1250px){.app-header{gap:16px;padding:0 16px}.brand-text>span{display:none}.brand-mark{width:34px;height:34px}.brand-text b{font-size:14px}.top-actions{gap:6px}aside.library{width:246px}.inspector{width:254px}.panel-heading{padding:18px 16px 14px}.panel-heading h1{font-size:18px}.color-row{gap:6px;padding-left:16px;padding-right:16px}.part-btn{min-height:94px}.part-btn img{height:48px}.history-actions{padding-right:7px;margin-right:0}.stage-controls{left:12px;top:12px;right:78px}.view-presets{right:12px;top:12px}.tool-modes button kbd{display:none}}
@media(max-width:1100px){.brand-text{display:none}.app-header{height:64px;gap:14px}.inspector{display:none;position:absolute;right:0;top:0;bottom:0;width:290px;max-width:calc(100% - 42px);z-index:25;box-shadow:-8px 0 35px #243f5720}.drawer-inspector .inspector{display:flex}.inspector .drawer-close{display:inline-flex}.panel-access{display:flex;position:absolute;bottom:92px;left:16px;gap:7px;z-index:8}.panel-access button{font-size:11px;box-shadow:var(--shadow);background:#fff;min-height:38px}#btnLibraryPanel{display:none}.work-section{padding:16px 18px}.work-heading{min-height:30px}.drawer-close{min-height:30px;height:30px;width:30px;border-color:transparent}.scope-note{padding-top:8px}.example-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.work-menu-content{right:-65px}}
@media(max-width:760px){.app-header,.immersive .app-header{height:108px;padding:10px 12px;gap:8px;flex-wrap:wrap;align-content:center}.brand-text{display:block}.brand-mark{width:30px;height:30px}.brand-mark .icon{width:21px;height:21px}.brand-text b{font-size:13px}.brand-text>span{display:none}.mode-switch{margin-left:auto;padding:3px}.mode-switch a{font-size:11px;padding:6px 10px}.top-actions{width:100%;margin-left:0;gap:7px;justify-content:flex-end}.history-actions{margin-right:auto;padding-right:0;border:0}.history-actions button{width:32px;min-height:32px}.top-actions>button{min-height:32px;padding:6px 9px;font-size:11px}#btnPanels .lbl,#btnBuildFull .lbl{display:none}.top-actions #btnBuildFull,.top-actions #btnPanels{width:34px;padding:6px}.work-menu>summary{min-height:32px;font-size:11px;padding:6px}.work-menu-content{right:-110px;top:calc(100% + 10px)}aside.library{width:232px}.stage-toolbar{gap:6px}.tool-modes,.rotation-tools{padding:3px}.stage-controls{left:10px;right:72px;top:10px;gap:7px}.stage-toolbar button{font-size:11px}.stage-toolbar .icon{width:15px;height:15px}.tool-modes button{padding:6px 7px}.view-presets{top:10px;right:10px;padding:5px 3px}.view-presets button{width:40px;min-height:30px}.placement-options{padding:7px 8px;gap:7px}.placement-options label{font-size:10px}.stage-foot{padding:22px 12px 12px}.foot-row{gap:8px}#selInfo{font-size:11px}#cursorInfo{font-size:9px}#partCount{font-size:10px;padding:5px 7px}#emptyBuild strong{font-size:24px}#examplesDialog{padding:20px;border-radius:14px}.examples-header h2{font-size:23px}}
@media(max-width:700px){aside.library{display:none;position:absolute;left:0;top:0;bottom:0;width:280px;max-width:calc(100% - 42px);z-index:25;box-shadow:8px 0 35px #243f5720}.drawer-library aside.library{display:flex}.library .drawer-close{display:inline-flex}#btnLibraryPanel{display:inline-flex}.stage-toolbar{display:grid;grid-template-columns:auto auto;gap:6px;max-width:100%}.tool-modes{grid-column:1;grid-row:1}.rotation-tools{grid-column:1 / -1;grid-row:2;justify-self:start}#renderQuality{grid-column:2;grid-row:1;width:90px;min-height:40px;font-size:10px}.placement-options{gap:7px}.placement-options #placementState{width:100%}#toast{top:202px;font-size:11px}#emptyBuild{top:51%;max-width:90%;width:320px}.empty-mark{width:52px;height:52px;margin-bottom:15px;border-radius:15px}.empty-mark .icon{width:28px;height:28px}#emptyBuild>p:not(.section-kicker){font-size:12px;margin:9px 0 16px}.empty-tip{margin-top:16px;font-size:9px}.empty-actions button{font-size:11px}.panel-access{left:12px;bottom:96px}.examples-intro{font-size:11px;margin-bottom:18px}.example-grid{grid-template-columns:1fr}.examples-footer{flex-direction:column;align-items:stretch;gap:12px}.examples-footer button{width:100%}.panel-heading{padding-top:18px}.color-row{gap:7px}.part-btn{min-height:99px}.part-btn img{height:53px}}
@media(max-height:650px){#emptyBuild{top:57%}.empty-mark{display:none}#emptyBuild>p:not(.section-kicker){margin:7px 0 12px}.empty-tip{display:none}.panel-heading{padding-top:12px;padding-bottom:10px}.section-kicker{margin-bottom:3px}.library-search{padding-bottom:10px}.color-row{padding-bottom:12px}.stage-foot{padding-top:14px}.selection-empty{padding:8px 0}.panel-access{bottom:78px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}.spinner{border-color:var(--accent)}}
@media(pointer:coarse){.category-chips button{min-height:34px}.color-dot{min-height:25px}.view-presets button{min-height:34px}}
/* Connector feedback stays beside the existing placement tools. */
#btnCycleConnection{min-height:25px;padding:3px 6px;font-size:10px;color:var(--accent);background:var(--accent-soft);border-color:var(--accent-line)}
.connection-status{font-size:10px;line-height:1.8;color:var(--muted);margin-top:10px;padding:8px 10px;background:var(--panel2);border-radius:7px}
.connection-status[data-connected=true]{color:#32695e;background:#edf6f2}
.full-library-open{display:flex;align-items:center;justify-content:space-between;width:100%;margin-bottom:10px;padding:11px 10px;background:#eaf1f8;color:#285b86;border:1px solid #cbdcec;border-radius:9px;font-weight:700;font-size:12px}.full-library-open span{font-size:10px;font-weight:400}
.full-library-dialog{width:min(1040px,calc(100vw - 28px));max-height:calc(100dvh - 32px);padding:28px;border:1px solid var(--line);border-radius:16px;color:var(--text);background:#fff;box-shadow:0 20px 80px #142d4930}.full-library-dialog::backdrop{background:#132d4770;backdrop-filter:blur(3px)}.full-library-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.full-library-heading h2{font-size:24px;margin:6px 0}.full-library-heading p{font-size:12px;color:var(--muted);margin:7px 0 18px}.full-library-search{display:flex;gap:10px;margin-bottom:16px}.full-library-search input{flex:1;min-width:0;height:42px;padding:0 14px;border:1px solid var(--line);border-radius:8px}.full-library-search select{max-width:190px;border:1px solid var(--line);border-radius:8px;padding:0 10px;background:#fff}.full-library-body{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px}.full-library-results{height:min(500px,calc(100dvh - 300px));overflow:auto;display:grid;grid-template-columns:1fr 1fr;gap:6px;align-content:start;padding:2px}.full-part-result{text-align:left;display:flex;flex-direction:column;gap:5px;padding:12px;border:1px solid var(--line);border-radius:8px;min-width:0;background:#f8fafc}.full-part-result b{font-size:12px;color:var(--blue)}.full-part-result span{font-size:11px;line-height:1.5;overflow-wrap:anywhere}.full-part-result.on{border-color:var(--blue);background:#edf4fc}.full-library-preview h3{font-size:16px;line-height:1.6;margin:14px 0 4px}.full-library-preview p{font-size:12px;color:var(--muted);line-height:1.8}.full-part-image{aspect-ratio:1.4;background:#f0f4f7;border-radius:12px;display:grid;place-items:center;padding:16px;overflow:hidden}.full-part-image img{width:100%;height:100%;object-fit:contain}.full-part-image span{font-size:12px;text-align:center;color:var(--muted)}.full-library-preview details{font-size:11px;margin:12px 0}.full-library-preview details p{max-height:120px;overflow:auto;font-size:10px}.full-library-preview .btn-primary{width:100%;padding:12px;margin-top:10px}.full-library-preview .full-library-note{font-size:10px;margin-top:12px}.full-library-pager{display:flex;align-items:center;justify-content:center;gap:24px;margin-top:18px;font-size:12px}.full-library-pager button{padding:7px 16px;border:1px solid var(--line);border-radius:6px;background:white}.full-library-heading .icon-button{font-size:24px}
@media(max-width:700px){.full-library-dialog{padding:16px}.full-library-heading h2{font-size:19px}.full-library-body{grid-template-columns:1fr 150px;gap:12px}.full-library-results{grid-template-columns:1fr;height:calc(100dvh - 280px)}.full-library-preview h3{font-size:12px}.full-part-image{padding:4px;aspect-ratio:1}.full-library-search{gap:6px}.full-library-search select{max-width:112px;font-size:11px}.full-library-preview .btn-primary{font-size:11px;padding:8px}.full-library-preview p{font-size:10px}}
.mechanism-tools{padding:12px;background:#f0f6fc;border:1px solid #d8e5f1;border-radius:9px;margin-bottom:14px}.mechanism-tools button{width:100%;padding:10px;background:#2a5d88;color:#fff;border:0;border-radius:6px;font-weight:700}.mechanism-tools .help-text{margin:8px 0 0}
.full-library-dialog{margin:auto;color:var(--ink)}.full-part-result{align-items:flex-start;white-space:normal}.full-part-result b{color:var(--accent)}#fullLibraryDialog #useFullPart,#mechanismTools #btnMechanism{background:var(--accent);border-color:var(--accent);color:#fff}#fullLibraryDialog #useFullPart:hover:not(:disabled),#mechanismTools #btnMechanism:hover:not(:disabled){background:#204d78;border-color:#204d78}
#fullLibraryDialog #useFullPart{white-space:normal;line-height:1.5}

.full-library-results{grid-auto-rows:max-content}.full-part-result{min-height:64px;justify-content:flex-start}.full-part-result>b,.full-part-result>span{flex-shrink:0}

#btnCameraPan[aria-pressed=true]{color:var(--accent);background:var(--accent-soft);border-color:var(--accent-line)}

.step-instruction{font-size:12px;line-height:1.65;color:var(--ink,#253341);padding:10px 12px;background:#eef4f1;border-left:3px solid #4c8b70;border-radius:4px}.example-card[aria-busy="true"]{opacity:.65;cursor:progress}

.model-mechanism{padding:12px 18px;border-top:1px solid var(--line,#e3e7ea)}.model-mechanism button{width:100%}.model-mechanism .help-text{margin:8px 0 0}

#btnViewPower{margin-top:8px}

.part-btn[aria-busy="true"]{opacity:.6;cursor:progress}