:root{color-scheme:dark;--bg: #03050a;--panel: rgba(5, 9, 15, .68);--panel-strong: rgba(6, 12, 18, .84);--line: rgba(211, 231, 240, .2);--text: #f2fbf8;--muted: #a9bbb9;--dim: #6d7b82;--teal: #22e3c4;--amber: #ffb84d;--violet: #9f7cff;--ice: #dff7ff;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html,body{min-width:320px;min-height:100%;margin:0;background:radial-gradient(circle at 20% 18%,rgba(34,227,196,.16),transparent 29%),radial-gradient(circle at 84% 24%,rgba(159,124,255,.16),transparent 30%),radial-gradient(circle at 52% 88%,rgba(255,184,77,.11),transparent 28%),linear-gradient(180deg,#020308,#071018 58%,#03050a);color:var(--text)}button,a{-webkit-tap-highlight-color:transparent}button{border:0;font:inherit}a{color:var(--teal);font-weight:850;text-decoration:none}a:hover{color:#e9fff9}:focus-visible{outline:3px solid rgba(255,184,77,.95);outline-offset:3px}h1,h2,p{margin-top:0}h1{margin:0;color:#f8fffb;font-size:clamp(1.55rem,4vw,2.15rem);line-height:1}h2{margin:0;font-size:1rem;line-height:1.18}.construction-shell{position:relative;display:grid;min-height:100svh;gap:12px;padding:12px;overflow:hidden;isolation:isolate}.construction-shell:before,.construction-shell:after{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none}.construction-shell:before{background:linear-gradient(90deg,rgba(255,255,255,.025),transparent 14%,transparent 86%,rgba(255,255,255,.02)),radial-gradient(circle at 50% 50%,transparent 38%,rgba(0,0,0,.34))}.construction-shell:after{background:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px);background-size:100% 4px;mix-blend-mode:screen;opacity:.09}.lab-hud{border:1px solid var(--line);border-radius:8px;background:linear-gradient(180deg,#ffffff12,#ffffff03),var(--panel);box-shadow:0 20px 70px #00000057,inset 0 1px #ffffff14;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.lab-topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px}.lab-title{min-width:0}.eyebrow{margin:0 0 6px;color:var(--teal);font-size:.68rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.back-link{flex:0 0 auto;padding:9px 12px;border:1px solid rgba(34,227,196,.42);border-radius:7px;background:linear-gradient(180deg,#22e3c421,#22e3c409),#ffffff09;color:#eafffb;font-size:.76rem;font-weight:900;line-height:1}.builder-grid{display:grid;grid-template-columns:minmax(220px,280px) minmax(0,1fr) minmax(210px,260px);gap:12px;min-height:0}.palette-panel,.inspector-panel{display:grid;align-content:start;gap:12px;min-height:0;padding:12px}.tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.tool-button,.mode-button{min-height:44px;border:1px solid rgba(211,231,240,.14);border-radius:7px;background:#ffffff09;color:var(--text);cursor:pointer;font-weight:850}.tool-button{display:grid;gap:4px;justify-items:start;padding:9px;text-align:left}.tool-button span{color:var(--muted);font-size:.68rem;font-weight:800}.tool-button.is-active,.mode-button.is-active{border-color:#22e3c494;background:#22e3c417;box-shadow:inset 0 0 0 1px #22e3c414}.tool-button:hover,.mode-button:hover{border-color:#ffb84d85}.mode-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.assistive-copy,.hint-stack{color:var(--muted);font-size:.82rem;font-weight:760;line-height:1.45}.canvas-panel{position:relative;min-height:620px;overflow:hidden;border:1px solid rgba(211,231,240,.2);border-radius:8px;background:linear-gradient(180deg,#ffffff09,#ffffff03),#03050ab8;box-shadow:inset 0 0 0 1px #ffffff09,0 20px 70px #00000052}#constructionCanvas{display:block;width:100%;height:100%;min-height:inherit;cursor:crosshair;touch-action:none}.metric-list{display:grid;gap:8px;margin:0}.metric-list div{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:38px;padding:8px 10px;border:1px solid rgba(211,231,240,.14);border-radius:6px;background:#ffffff08}.metric-list dt{color:var(--muted);font-size:.7rem;font-weight:850;letter-spacing:.06em;text-transform:uppercase}.metric-list dd{margin:0;color:var(--amber);font-weight:950}.hint-stack{display:grid;gap:8px;padding-top:10px;border-top:1px solid rgba(211,231,240,.15)}.hint-stack p{margin:0}@media(max-width:980px){.construction-shell{overflow:visible}.builder-grid{grid-template-columns:minmax(0,1fr)}.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.canvas-panel{min-height:58svh;order:-1}}@media(max-width:560px){.construction-shell{padding:10px}.lab-topbar{align-items:stretch;flex-direction:column}.back-link{text-align:center}.tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.canvas-panel{min-height:60svh}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}