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20px;padding:20px;display:grid;position:relative}.assemble-current-step__number{background:var(--color-primary);color:#fff;width:38px;height:38px;font:700 14px var(--font-mono);border-radius:50%;place-items:center;display:grid;position:absolute;top:20px;left:20px}[data-theme=dark] .assemble-current-step__number{color:#082f2f}.assemble-current-step__heading{grid-column:1/-1;min-width:0;min-height:38px;padding-left:52px}.assemble-current-step__title-row{align-items:center;gap:8px;display:flex}.assemble-current-step__heading h3{color:var(--color-text);margin:0;font-size:18px;line-height:1.35}.assemble-current-step__repeat{background:var(--color-primary);color:#fff;font:800 13px var(--font-mono);border-radius:999px;flex:none;padding:3px 8px}[data-theme=dark] .assemble-current-step__repeat{color:#082f2f}.assemble-current-step__heading p{color:var(--color-text-secondary);margin:4px 0 0;font-size:13px;line-height:1.45}.assemble-current-step__heading .assemble-current-step__repeat-note{color:var(--color-primary-dark);font-size:12px;font-weight:650}.assemble-visual{grid-area:2/1;align-self:start;min-width:0}.assemble-figure{margin:0}.assemble-figure__stage{border:1px solid var(--color-border);background:var(--color-bg-subtle);border-radius:10px;width:fit-content;max-width:100%;margin-inline:auto;position:relative;overflow:hidden}.assemble-figure__stage img{-webkit-user-select:none;user-select:none;width:auto;max-width:100%;height:auto;max-height:min(36dvh,320px);display:block;position:static}.assemble-figure__stage svg{pointer-events:none;width:100%;height:100%;display:block;position:absolute;inset:0}.assemble-figure__legend{color:var(--color-text-secondary);flex-wrap:wrap;justify-content:center;gap:5px 12px;margin-top:7px;font-size:10px;line-height:1.35;display:flex}.assemble-figure__legend span{align-items:center;gap:5px;display:inline-flex}.assemble-figure__legend i{background:0 0;border:2px solid #b91c1c;border-radius:999px;width:11px;height:7px;display:inline-block}.assemble-figure__legend i.is-pocket{background:#fef3c7;border:1.5px solid #92400e;width:15px;height:8px;position:relative;transform:rotate(-18deg)}.assemble-figure__legend i.is-pocket:after{content:"";background:#5b2c0c;border-radius:999px;width:8px;height:3px;position:absolute;top:1.5px;right:1.5px}.assemble-figure__legend i.is-screw{background:#f8fafc;border:1.5px solid #334155;border-radius:50%;width:10px;height:10px;position:relative}.assemble-figure__legend i.is-screw:after{content:"";background:linear-gradient(90deg,#0000 42%,#334155 42% 58%,#0000 58%),linear-gradient(#0000 42%,#334155 42% 58%,#0000 58%);position:absolute;inset:2.5px 1px}.assemble-figure__legend i.is-nail{border-width:0 0 2px 2px;border-radius:0;width:8px;height:8px;transform:rotate(-45deg)}.assemble-figure__legend i.is-far{border-style:dashed}.assemble-seam{stroke:var(--color-text);stroke-width:2px;stroke-dasharray:7 5;fill:none;opacity:.7;vector-effect:non-scaling-stroke}.assemble-marker{stroke:#b91c1c;stroke-width:2.5px;fill:#fff;vector-effect:non-scaling-stroke}.assemble-marker--nail{fill:none}.assemble-marker.is-far{fill:none;stroke-dasharray:3 3;opacity:1}.assemble-marker--screw{fill:#f8fafc;stroke:#334155;stroke-width:1.7px}.assemble-marker--screw.is-far{fill:#f8fafc;stroke:#475569;stroke-dasharray:3 2}.is-far .assemble-seam{opacity:.42;stroke-dasharray:3 4}.assemble-screw-recess{fill:none;stroke:#334155;stroke-width:1.5px;stroke-linecap:round;vector-effect:non-scaling-stroke}.assemble-pocket-hole__rim{fill:#fef3c7;stroke:#92400e;stroke-width:1.5px;vector-effect:non-scaling-stroke}.assemble-pocket-hole__cavity{fill:#5b2c0c;stroke:#2f1608;stroke-width:.8px;vector-effect:non-scaling-stroke}.assemble-pocket-hole.is-far .assemble-pocket-hole__rim{fill:#fffbeb;stroke-dasharray:3 2}.assemble-pocket-hole.is-far .assemble-pocket-hole__cavity{opacity:.78}.assemble-anchor{paint-order:stroke;stroke:var(--color-surface);fill:var(--color-text);font-family:var(--font-sans);font-weight:800}.assemble-visual__loading,.assemble-visual__fallback{border:1px solid var(--color-border);min-height:260px;color:var(--color-text-secondary);text-align:center;border-radius:10px;place-items:center;gap:10px;padding:20px;font-size:12px;display:grid}.assemble-visual__skeleton{background:linear-gradient(100deg,var(--color-bg-subtle) 25%,var(--color-bg-hover) 40%,var(--color-bg-subtle) 55%);background-size:200% 100%;border-radius:8px;width:75%;height:180px;animation:1.4s infinite assemble-shimmer}@keyframes assemble-shimmer{to{background-position:-200% 0}}.assemble-instructions{grid-area:2/2;align-content:start;gap:16px;min-width:0;display:grid}.assemble-resources{grid-template-columns:1fr 1fr;gap:10px;display:grid}.assemble-resources section{border:1px solid var(--color-border);background:var(--color-bg-subtle);border-radius:8px;min-width:0;padding:10px 12px}.assemble-current-step h4{color:var(--color-text-secondary);letter-spacing:.35px;text-transform:uppercase;margin:0 0 7px;font-size:11px}.assemble-resources ul,.assemble-resources p{color:var(--color-text);margin:0;padding-left:17px;font-size:12px;line-height:1.5}.assemble-resources p{padding-left:0}.assemble-chips{flex-wrap:wrap;gap:5px;display:flex}.assemble-chips span{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);border-radius:999px;padding:3px 8px;font-size:12px}.assemble-action-list ol{gap:8px;margin:0;padding:0;list-style:none;display:grid}.assemble-action-list li{grid-template-columns:26px minmax(0,1fr);align-items:start;gap:9px;display:grid}.assemble-action-list li>span{background:var(--color-primary-light);width:24px;height:24px;color:var(--color-primary-dark);font:700 11px var(--font-mono);border-radius:6px;place-items:center;display:grid}.assemble-action-list p{color:var(--color-text);margin:2px 0 0;font-size:13px;line-height:1.5}.assemble-checks{border-left:3px solid var(--color-success);background:var(--color-success-soft-bg);border-radius:0 7px 7px 0;padding:10px 12px}.assemble-checks ul{color:var(--color-text);gap:4px;margin:0;padding-left:18px;font-size:12px;line-height:1.45;display:grid}.assemble-navigation{z-index:2;border-top:1px solid var(--color-border);background:var(--color-bg-subtle);grid-template-columns:auto 1fr auto;align-items:center;gap:10px;padding:10px 14px;display:grid;position:sticky;bottom:0}.assemble-navigation>span{color:var(--color-success);text-align:center;font-size:12px;font-weight:700}.assemble-empty,.assemble-stale{text-align:center;flex:1;justify-content:center;align-items:center;min-height:280px;padding:24px;display:flex}.assemble-empty__inner,.assemble-stale__inner{flex-direction:column;align-items:center;gap:11px;max-width:560px;display:flex}.assemble-empty__title,.assemble-stale__title{color:var(--color-text);margin:0;font-size:18px}.assemble-empty__body,.assemble-stale__body{color:var(--color-text-secondary);margin:0;font-size:13px;line-height:1.55}.assemble-empty__tip{color:var(--color-text-tertiary);margin:0;font-size:12px;line-height:1.5}.assemble-empty__link{color:var(--color-primary);font-size:13px;font-weight:700;text-decoration:none}.assemble-empty__link:hover{text-decoration:underline}.assemble-empty__link:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px}@media (width<=640px){.assemble-workspace__inner{padding:10px 8px calc(88px + env(safe-area-inset-bottom));gap:10px}.assemble-header{flex-direction:column;align-items:flex-start}.assemble-title{font-size:16px}.assemble-actions{width:100%}.assemble-actions .btn{flex:1;min-width:44px;padding-inline:9px}.assemble-guide__toolbar{flex-direction:column;align-items:stretch;padding:10px}.assemble-mode-switch{grid-template-columns:1fr 1fr;width:100%;display:grid}.assemble-mode-switch button{min-height:44px}.assemble-current-step{grid-template-columns:1fr;gap:12px;padding:14px 12px}.assemble-current-step__number{width:32px;height:32px;top:14px;left:12px}.assemble-current-step__heading{grid-column:1;padding-left:44px}.assemble-current-step__heading h3{font-size:16px}.assemble-visual,.assemble-instructions{grid-area:auto/1}.assemble-figure__stage img{max-height:min(32dvh,260px)}.assemble-visual__loading,.assemble-visual__fallback{min-height:220px}.assemble-resources{grid-template-columns:1fr}.assemble-navigation{right:8px;bottom:max(8px,env(safe-area-inset-bottom));z-index:30;border:1px solid var(--color-border);box-shadow:var(--shadow-lg);border-radius:10px;grid-template-columns:1fr 1fr;padding:8px;position:fixed;left:8px}.assemble-navigation>span{grid-area:1/1/auto/-1}.assemble-navigation>span:empty{display:none}.assemble-navigation .btn{width:100%;min-height:44px}}.app-layout{background:var(--color-bg);flex-direction:column;height:100dvh;min-height:560px;display:flex;position:relative;overflow:hidden}.btn{border:1px solid var(--color-border);background:var(--color-surface);min-width:44px;min-height:44px;color:var(--color-text);font:600 12px/1.2 var(--font-sans);cursor:pointer;border-radius:7px;justify-content:center;align-items:center;gap:6px;padding:5px 12px;transition:background .12s,border-color .12s,transform .12s,filter .12s,box-shadow .12s;display:inline-flex}.btn:hover:not(:disabled){border-color:var(--color-border-strong);background:var(--color-bg-subtle);filter:brightness(1.02)}.btn:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.42;cursor:not-allowed}.btn-sm{min-width:44px;min-height:44px;padding:4px 10px;font-size:12px}.btn-xs{gap:5px;min-width:44px;min-height:44px;padding:4px 10px;font-size:12px}.btn-primary{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){border-color:var(--color-primary-dark);background:var(--color-primary-dark)}.btn-accent{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.btn-accent:hover:not(:disabled){border-color:var(--color-primary-dark);background:var(--color-primary-dark)}.btn-secondary{background:var(--color-bg-subtle)}.btn-danger{border-color:var(--color-error);background:var(--color-error);color:#fff}.btn-danger:hover:not(:disabled){background:#7f1d1d;border-color:#7f1d1d}[data-theme=dark] .btn-danger{background:var(--color-error);border-color:var(--color-error);color:#1e2028}.btn-warning{border-color:var(--color-warning);background:var(--color-warning);color:#fff}.btn-warning:hover:not(:disabled){background:#7c2d12;border-color:#7c2d12}[data-theme=dark] .btn-warning{background:var(--color-warning);border-color:var(--color-warning);color:#1e2028}[data-theme=dark] .btn-primary,[data-theme=dark] .btn-accent,[data-theme=dark] .mode-selector-btn.is-active,[data-theme=dark] .edge-btn.active,[data-theme=dark] .pwa-action--accent{color:#082f2f}.btn-icon{min-width:44px;min-height:44px;color:var(--color-text-secondary);background:0 0;border-color:#0000;padding:5px;transition:background .12s,border-color .12s,color .12s,filter .12s}.btn-icon:hover:not(:disabled){filter:brightness(1.02)}.btn-icon:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.btn-icon:hover:not(:disabled){color:var(--color-text);background:var(--color-bg-hover)}.top-toolbar{z-index:50;align-items:center;gap:var(--space-3);min-height:48px;color:var(--color-toolbar-text);background:linear-gradient(100deg,#131820 0%,#182028 60%,#10262a 100%);border-bottom:1px solid #ffffff14;padding:6px 10px;display:flex}.toolbar-left,.toolbar-center,.toolbar-right{align-items:center;gap:var(--space-1);min-width:0;display:flex}.toolbar-left{gap:var(--space-2)}.toolbar-center{scrollbar-width:none;-webkit-overflow-scrolling:touch;flex:1;justify-content:safe center;overflow-x:auto}.toolbar-center::-webkit-scrollbar{display:none}.toolbar-right{justify-content:flex-end}.toolbar-brand{letter-spacing:-.3px;color:#f1f5f9;white-space:nowrap;margin:0;font-size:14px;font-weight:800}.toolbar-project-name{color:#d5dfea;text-overflow:ellipsis;white-space:nowrap;background:0 0;border:1px solid #0000;border-left-color:#ffffff24;border-radius:6px;outline:0;width:170px;max-width:200px;height:32px;padding:4px 10px;font-size:12px;overflow:hidden}.toolbar-project-name:hover{background:#ffffff0a;border-color:#ffffff1f}.toolbar-project-name:focus{color:#fff;background:#ffffff12;border-color:#2dd4bf73}.toolbar-project-name:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.toolbar-sep{background:var(--color-toolbar-separator);width:1px;height:18px;margin:0 3px}.top-toolbar .toolbar-btn{color:#e5e7eb;min-width:44px;min-height:44px;font-size:var(--text-xs);background:0 0;border-color:#0000;padding:5px 11px;transition:background .15s,border-color .15s,color .15s,filter .15s,box-shadow .15s}.top-toolbar .toolbar-btn:hover:not(:disabled){background:#ffffff17;border-color:#ffffff26}.top-toolbar .toolbar-btn:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.top-toolbar .toolbar-btn.btn-accent{color:#082f2f;background:linear-gradient(135deg,#2dd4d4,#14a3a8);border-color:#2dd4d4;min-width:108px;font-weight:700}.top-toolbar .toolbar-btn.btn-accent:hover:not(:disabled){filter:brightness(1.05)}.top-toolbar .toolbar-btn.btn-accent:disabled{opacity:.42;filter:saturate(.3)brightness(.9)}.toolbar-center .toolbar-btn{white-space:nowrap;min-width:0;height:36px;min-height:36px;font:600 12px/1.2 var(--font-sans);border-radius:7px;flex:none;padding:6px 12px}.toolbar-center .toolbar-btn:not(.btn-accent){color:#e5e7eb;background:#ffffff0f;border-color:#ffffff24}.toolbar-center .toolbar-btn:not(.btn-accent):hover:not(:disabled){color:#fff;background:#ffffff1f;border-color:#ffffff38}.toolbar-center .toolbar-btn:not(.btn-accent):focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.toolbar-center .toolbar-btn.btn-accent{border-radius:7px;height:36px;min-height:36px}.toolbar-modes{align-items:center;display:flex}.toolbar-modes .mode-selector{background:#ffffff14;border-color:#fff3}.toolbar-modes .mode-selector-btn{color:#cbd5e1}.toolbar-modes .mode-selector-btn:hover:not(:disabled):not([aria-disabled=true]):not(.is-active){color:#fff;background:#ffffff24}.toolbar-modes .mode-selector-btn:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.toolbar-modes .mode-selector-btn.is-active:focus-visible{outline:2px solid var(--color-focus);outline-offset:3px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.toolbar-modes .mode-selector-btn:disabled,.toolbar-modes .mode-selector-btn[aria-disabled=true]{opacity:.35}.top-toolbar .toolbar-github{text-decoration:none}[data-theme=dark] .top-toolbar .toolbar-btn.btn-accent{color:#082f2f}.toolbar-export-menu{display:inline-flex;position:relative}.toolbar-export-menu summary{list-style:none}.toolbar-export-menu summary::-webkit-details-marker{display:none}.export-popup{border:1px solid var(--color-border);background:var(--color-surface);width:min(360px,100%);color:var(--color-text);border-radius:14px;overflow:hidden;box-shadow:0 24px 70px #0006}.export-popup-header{border-bottom:1px solid var(--color-border);font-size:var(--text-lg);justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.export-popup-close{background:var(--color-bg-hover);width:40px;height:40px;color:var(--color-text);cursor:pointer;border:0;border-radius:8px;place-items:center;font-size:25px;line-height:1;display:grid}.export-popup-close:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow)}.export-popup-options{gap:var(--space-2);padding:12px;display:grid}.export-popup-options button{border:1px solid var(--color-border);background:var(--color-bg);width:100%;min-height:48px;color:var(--color-text);text-align:left;cursor:pointer;border-radius:9px;align-items:center;gap:12px;padding:11px 14px;font:600 14px/1.2 inherit;display:flex}.export-popup-options button:hover{border-color:var(--color-primary);background:var(--color-bg-hover)}.export-popup-options button:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow);border-color:var(--color-focus)}.toolbar-sheet-backdrop{align-items:flex-end;padding:0}.toolbar-sheet{border:1px solid var(--color-border);background:var(--color-surface);width:100%;max-height:82dvh;color:var(--color-text);padding-bottom:env(safe-area-inset-bottom);border-bottom:0;border-radius:16px 16px 0 0;animation:.18s slideUp;overflow:auto;box-shadow:0 -18px 60px #00000061}.toolbar-sheet-header{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:14px 16px;font-size:16px;display:flex}.toolbar-sheet-items{gap:var(--space-2);padding:12px;display:grid}.toolbar-sheet-items>button,.toolbar-sheet-items>a{border:1px solid var(--color-border);background:var(--color-bg);width:100%;min-height:52px;color:var(--color-text);text-align:left;cursor:pointer;border-radius:9px;align-items:center;gap:12px;padding:11px 14px;font:600 15px/1.2 inherit;text-decoration:none;display:flex}.toolbar-sheet-items>button:hover,.toolbar-sheet-items>a:hover{border-color:var(--color-primary);background:var(--color-bg-hover)}.toolbar-sheet-items>button:focus-visible,.toolbar-sheet-items>a:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px;box-shadow:0 0 0 4px var(--color-focus-shadow);border-color:var(--color-focus)}.toolbar-sheet-items>button:disabled{opacity:.42;cursor:not-allowed}.toolbar-sheet-pwa{border-top:1px solid var(--color-border);flex-wrap:wrap;gap:8px;padding-top:4px;display:flex}.toolbar-sheet-pwa .pwa-action{border-color:var(--color-border);background:var(--color-bg);min-height:52px;color:var(--color-text);padding:8px 14px}.toolbar-sheet-pwa .pwa-action--accent{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.toolbar-sheet-pwa .pwa-status{color:var(--color-text-secondary);font-size:13px}.shortcuts-popup{border:1px solid var(--color-border);background:var(--color-surface);width:min(420px,100vw - 32px);color:var(--color-text);border-radius:14px;overflow:hidden;box-shadow:0 24px 70px #0006}.shortcuts-popup-header{border-bottom:1px solid var(--color-border);font-size:var(--text-lg);justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.shortcuts-list{gap:var(--space-3);margin:0;padding:14px 16px 16px;display:grid}.shortcuts-row{color:var(--color-text-secondary);align-items:center;gap:10px;font-size:13px;line-height:1.4;display:flex}.shortcuts-row dt{flex:none;align-items:center;gap:4px;display:flex}.shortcuts-row dd{margin:0}.shortcuts-row kbd{border:1px solid var(--color-border-strong);background:var(--color-bg);min-width:22px;height:22px;color:var(--color-text);font:600 11px/1 var(--font-mono);border-bottom-width:2px;border-radius:6px;justify-content:center;align-items:center;padding:0 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