:root{--ink: #2b2140;--paper: #fff8ec;--accent: #ff5d8f;--accent-dark: #d93a6c;--sky: #5bc0eb;--sun: #ffd23f;--mint: #3bceac;--muted: #7a6f8f;font-family:ui-rounded,SF Pro Rounded,Nunito,system-ui,sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0}main{max-width:860px;margin:0 auto;padding:2rem 1.25rem 4rem;display:grid;grid-template-columns:minmax(0,1fr);gap:1.75rem}h1{margin:0;font-size:2.5rem;letter-spacing:-.02em}h2{margin:0 0 .5rem;font-size:1.1rem}.tagline,#description{margin:.25rem 0 0;color:var(--muted)}.explainer{background:color-mix(in srgb,var(--sky) 18%,white);border:3px solid var(--ink);border-radius:16px;padding:1rem 1.25rem;line-height:1.5}.explainer ul{margin:0;padding-left:1.25rem}.explainer p{margin:.6rem 0 0}.explainer code{font-family:ui-monospace,SF Mono,Menlo,monospace;background:#fff;padding:0 .3em;border-radius:4px}label{display:grid;gap:.35rem;font-weight:600}.picker{display:grid;gap:.75rem}select,input:not([type=range]){font:inherit;font-weight:500;padding:.55rem .75rem;border:3px solid var(--ink);border-radius:12px;background:#fff;color:var(--ink)}#input{font-family:ui-monospace,SF Mono,Menlo,monospace;letter-spacing:.15em}.machine{background:#fff;border:3px solid var(--ink);border-radius:20px;padding:1rem 1rem 1.25rem;box-shadow:6px 6px 0 var(--ink)}.readout{display:flex;gap:1.5rem;margin-bottom:.75rem;color:var(--muted)}.readout strong{color:var(--ink);font-family:ui-monospace,SF Mono,Menlo,monospace}.tape-window{overflow:hidden;position:relative;padding-bottom:1.6rem;-webkit-mask-image:linear-gradient(90deg,transparent,black 12%,black 88%,transparent);mask-image:linear-gradient(90deg,transparent,black 12%,black 88%,transparent)}.tape{display:flex;justify-content:center;gap:4px}.cell{flex:0 0 2.4rem;height:2.8rem;display:grid;place-items:center;background:var(--paper);border:2px solid var(--ink);border-radius:8px;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:1.4rem;font-weight:700}.cell.current{background:var(--sun);transform:translateY(-3px)}.head{position:absolute;left:50%;bottom:0;transform:translate(-50%);color:var(--accent);font-size:1.4rem;line-height:1}.result{margin:.75rem 0 0;padding:.6rem .9rem;border-radius:12px;font-weight:700}.result.halted{background:color-mix(in srgb,var(--mint) 25%,white)}.result.stuck{background:color-mix(in srgb,var(--accent) 20%,white)}.controls{display:flex;flex-wrap:wrap;align-items:end;gap:.75rem}button{font:inherit;font-weight:700;padding:.6rem 1.3rem;border:3px solid var(--ink);border-radius:999px;background:#fff;color:var(--ink);box-shadow:3px 3px 0 var(--ink);cursor:pointer}button:active:not(:disabled){transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}button:disabled{opacity:.4;cursor:default}button.primary{background:var(--accent);color:#fff;min-width:6.5rem}.speed{flex:1 1 220px;margin-left:auto}.speed span{font-weight:500;color:var(--muted)}.speed input{accent-color:var(--accent);width:100%}.rule-table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:3px solid var(--ink);border-radius:16px}.rule-table th{position:relative;padding:.6rem .75rem;text-align:left;font-size:.85rem;border-bottom:3px solid var(--ink);white-space:nowrap}.rule-table{--in-tint: color-mix(in srgb, var(--sky) 14%, white);--out-tint: color-mix(in srgb, var(--mint) 14%, white)}.rule-table .groups th{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;border-bottom:2px solid var(--ink)}.rule-table .group-in{background:color-mix(in srgb,var(--sky) 45%,white);border-top-left-radius:13px}.rule-table .group-out{background:color-mix(in srgb,var(--mint) 45%,white);border-top-right-radius:13px}.rule-table tr:not(.groups) th:nth-child(-n+2),.rule-table tbody tr:not(.comment) td:nth-child(-n+2){background:var(--in-tint)}.rule-table tr:not(.groups) th:nth-child(n+3),.rule-table tbody tr:not(.comment) td:nth-child(n+3){background:var(--out-tint)}.rule-table .group-in,.rule-table tr:not(.groups) th:nth-child(2),.rule-table tbody td:nth-child(2){border-right:3px solid var(--ink)}.rule-table td{padding:.35rem .75rem;border-top:1px solid color-mix(in srgb,var(--ink) 12%,white)}.rule-table tbody tr:first-child td{border-top:none}.rule-table tbody tr:last-child td:first-child{border-bottom-left-radius:13px}.rule-table tbody tr:last-child td:last-child{border-bottom-right-radius:13px}.rule-table .state,.rule-table .move{font-family:ui-monospace,SF Mono,Menlo,monospace}.rule-table .halt{color:var(--accent-dark);font-weight:700}.rule-table .comment td{color:var(--muted);font-size:.85rem;font-style:italic;padding-top:.75rem}.rule-table tbody tr.active td:nth-child(n){background:var(--sun)}.symbol{display:inline-grid;place-items:center;min-width:1.8rem;height:1.8rem;padding:0 .3rem;background:var(--paper);border:2px solid var(--ink);border-radius:6px;font-family:ui-monospace,SF Mono,Menlo,monospace;font-weight:700}.symbol.blank{font-family:inherit;font-size:.75rem;font-weight:600;color:var(--muted);border-style:dashed}button.info{margin-left:.4rem;padding:0;width:1.25rem;height:1.25rem;font-size:.75rem;line-height:1;border-width:2px;box-shadow:none;background:var(--sky);color:#fff;vertical-align:1px}button.info[aria-expanded=true]{background:var(--ink)}.tip{position:absolute;top:calc(100% + 6px);left:.5rem;z-index:10;width:15rem;padding:.6rem .75rem;background:var(--ink);color:#fff;border-radius:10px;font-size:.85rem;font-weight:500;line-height:1.4;white-space:normal;box-shadow:3px 3px color-mix(in srgb,var(--ink) 30%,transparent)}th:last-child .tip{left:auto;right:.5rem}