:root{color-scheme:dark;--blue-950: #071e2f;--blue-900: #0b2c43;--blue-800: #123e59;--blue-700: #1b4f6a;--blue-600: #2d617b;--paper-50: #f4f0df;--paper-200: #d9d1b5;--red-400: #ff765f;--mint-300: #7fe0c0;--amber-300: #f6c667;--danger-300: #ff9b93;--shadow: 0 16px 40px rgb(1 12 20 / .36);font-family:Arial,Helvetica,sans-serif;background:var(--blue-950);color:var(--paper-50);font-synthesis:none}*{box-sizing:border-box}html{min-width:320px;min-height:100%;background:var(--blue-950)}body{margin:0;min-height:100vh;font-size:16px;line-height:1.45;background-color:var(--blue-950);background-image:linear-gradient(rgb(45 97 123 / .1) 1px,transparent 1px),linear-gradient(90deg,rgb(45 97 123 / .1) 1px,transparent 1px);background-size:32px 32px}button,input{font:inherit}button,.link-button{min-height:44px;border:1px solid var(--blue-600);border-radius:3px;color:var(--paper-50);background:var(--blue-800);cursor:pointer;transition:transform .16s ease,background-color .16s ease,border-color .16s ease}button:hover,.link-button:hover{background:var(--blue-700);border-color:var(--paper-200)}button:active,.link-button:active{transform:translateY(1px)}button:disabled{opacity:.45;cursor:not-allowed}a{color:var(--mint-300);text-underline-offset:3px}:focus-visible{outline:3px solid var(--red-400);outline-offset:3px;box-shadow:0 0 0 5px var(--paper-50)}.skip-link{position:fixed;z-index:100;left:12px;top:8px;padding:10px 14px;color:var(--blue-950);background:var(--paper-50);transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.eyebrow,.index-mark,.mode-label,.save-status,.progress-count,.board-scale,kbd{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.06em;text-transform:uppercase}.eyebrow{display:block;color:var(--paper-200);font-size:.75rem}.topbar{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:10px max(20px,env(safe-area-inset-right)) 10px max(20px,env(safe-area-inset-left));border-bottom:1px solid var(--blue-600);background:#071e2ff0}.brand-block h1{margin:2px 0 0;font-size:clamp(1.45rem,3vw,2rem);line-height:1;letter-spacing:-.025em}.top-actions{display:flex;align-items:center;gap:8px}.save-status{margin-right:4px;color:var(--mint-300);font-size:.7rem}.icon-button{width:44px;padding:0;font-size:1.2rem}.text-button{padding:0 14px}.offline-banner{padding:8px 20px;text-align:center;color:var(--blue-950);background:var(--amber-300);font-weight:700}.workbench{min-height:calc(100vh - 116px);display:grid;grid-template-columns:216px minmax(420px,1fr) 272px}.parts-panel,.puzzles-panel{min-width:0;padding:18px 16px;background:#0b2c43e6}.parts-panel{border-right:1px solid var(--blue-600)}.puzzles-panel{border-left:1px solid var(--blue-600)}.panel-heading,.board-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.panel-heading>div,.board-toolbar>div:first-child{min-width:0}.panel-heading h2,.board-toolbar h2{display:inline;margin:0 0 0 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16px;border-bottom:1px solid var(--blue-600)}.mode-label{display:block;margin:3px 0 0 27px;color:var(--paper-200);font-size:.65rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.machine-controls{display:flex;align-items:center;gap:8px}.tool-button{padding:0 12px}.phase-control{display:grid;gap:1px;color:var(--paper-200);font:.6rem ui-monospace,SFMono-Regular,Consolas,monospace;text-transform:uppercase}.phase-control input{width:82px;accent-color:var(--red-400)}.speed-toggle{min-height:44px;display:inline-flex;align-items:center;gap:7px;padding:0 10px;border:1px solid var(--blue-600);border-radius:3px;cursor:pointer}.speed-toggle input{width:18px;height:18px;accent-color:var(--red-400)}.crank-button{min-width:132px;padding:0 16px;border-color:var(--red-400);color:var(--blue-950);background:var(--red-400);font-weight:800}.crank-button:hover{color:var(--blue-950);background:#ff917d;border-color:var(--paper-50)}.crank-button[aria-pressed=true]{background:var(--amber-300);border-color:var(--amber-300)}.crank-button span{display:inline-block;margin-right:6px;font-size:1.35rem}.board-wrap{position:relative;flex:1;min-height:400px;overflow:hidden}.board{width:100%;height:100%;min-height:400px;display:block;touch-action:none;background-color:var(--blue-900);background-image:linear-gradient(rgb(45 97 123 / .35) 1px,transparent 1px),linear-gradient(90deg,rgb(45 97 123 / .35) 1px,transparent 1px),linear-gradient(rgb(45 97 123 / .2) 1px,transparent 1px),linear-gradient(90deg,rgb(45 97 123 / .2) 1px,transparent 1px);background-size:80px 80px,80px 80px,16px 16px,16px 16px}.board.adding{cursor:crosshair}.mechanism-part{cursor:grab;color:var(--paper-50)}.mechanism-part:active{cursor:grabbing}.part-shape{fill:var(--blue-900);stroke:currentColor;stroke-width:3;vector-effect:non-scaling-stroke}.part-detail{fill:none;stroke:currentColor;stroke-width:2;vector-effect:non-scaling-stroke}.mechanism-part.powered{color:var(--mint-300)}.mechanism-part.selected .selection-ring{display:block}.selection-ring{display:none;fill:#ff765f14;stroke:var(--red-400);stroke-width:2;stroke-dasharray:5 5;vector-effect:non-scaling-stroke}.port{fill:var(--blue-950);stroke:var(--paper-50);stroke-width:2;vector-effect:non-scaling-stroke}.mechanism-part.powered 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4px;border:1px solid var(--blue-600);border-radius:2px;color:var(--paper-200);font-size:.62rem}.danger-button{color:var(--danger-300)}.puzzle-status{min-height:32px;display:flex;align-items:center;padding:5px 16px;color:var(--paper-200);background:var(--blue-800);font-size:.78rem}.puzzle-status.success{color:var(--blue-950);background:var(--mint-300);font-weight:700}.progress-count{color:var(--mint-300);font-size:.7rem}.puzzle-list{max-height:calc(100vh - 390px);margin:0 -5px;padding:0 5px;overflow-y:auto;list-style:none}.puzzle-card{margin-bottom:8px}.puzzle-card button{width:100%;min-height:62px;display:grid;grid-template-columns:30px 1fr auto;align-items:center;gap:7px;padding:8px;text-align:left;background:transparent}.puzzle-card button[aria-current=true]{border-color:var(--red-400);background:#ff765f1a}.puzzle-number{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--red-400);font-size:.72rem}.puzzle-copy{min-width:0}.puzzle-copy strong,.puzzle-copy 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nav{display:flex;gap:14px}.toast{position:fixed;z-index:50;right:18px;bottom:20px;max-width:min(360px,calc(100vw - 36px));padding:12px 14px;border-left:4px solid var(--mint-300);color:var(--paper-50);background:var(--blue-800);box-shadow:var(--shadow)}.toast button{min-height:36px;margin-left:8px;padding:0 8px}.paper-dialog{width:min(900px,calc(100vw - 28px));max-height:calc(100vh - 28px);padding:0;border:1px solid var(--paper-200);color:var(--blue-950);background:var(--paper-50);box-shadow:var(--shadow)}.paper-dialog::backdrop{background:#010c14c2;backdrop-filter:blur(3px)}.dialog-close{position:absolute;z-index:2;right:10px;top:10px;width:44px;color:var(--paper-50);background:var(--blue-950)}.guide-grid{display:grid;grid-template-columns:1.1fr 1fr}.guide-grid img{width:100%;height:100%;min-height:410px;object-fit:cover}.guide-copy{align-self:center;padding:38px 32px}.guide-copy .eyebrow,.compact-dialog .eyebrow{color:#31586a}.guide-copy h2,.compact-dialog h2{margin:7px 0 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