:root{--ink: #16212b;--chalk: #edf1f3;--stone: #c3cdd4;--pine: #2f7a5c;--brass: #b8862f;--flag: #c4402e;--stone-soft: #d8e0e5;--stone-line: #b3bec6;--paper: #f7fafb;--shadow: 0 1px 0 rgba(22, 33, 43, .06), 0 6px 18px rgba(22, 33, 43, .08);--font-mono: "DM Mono", "Space Mono", ui-monospace, "SFMono-Regular", "Courier New", monospace;--font-ui: "Barlow Condensed", "Archivo Narrow", "Oswald", system-ui, -apple-system, sans-serif;--tile: clamp(44px, 13vw, 60px);--tile-gap: clamp(6px, 2vw, 10px);--maxw: 480px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--chalk);color:var(--ink);font-family:var(--font-ui);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overscroll-behavior:none}button{font-family:inherit;color:inherit;cursor:pointer}:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}.app{min-height:100dvh;display:flex;flex-direction:column;align-items:center;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}.shell{width:100%;max-width:var(--maxw);display:flex;flex-direction:column;flex:1;min-height:0}.header{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--stone)}.brand{display:flex;align-items:baseline;gap:8px;margin-right:auto}.brand h1{font-family:var(--font-ui);font-weight:700;letter-spacing:.14em;font-size:24px;margin:0;text-transform:uppercase}.brand .puz{font-family:var(--font-mono);font-size:13px;color:#56646f}.iconbtn{background:transparent;border:0;width:40px;height:40px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-size:18px}.iconbtn:hover{background:var(--stone-soft)}.iconbtn svg{width:20px;height:20px}.play{flex:1;display:flex;flex-direction:column;justify-content:space-between;min-height:0;padding:6px 14px 4px}.ladder-wrap{display:flex;justify-content:center;gap:clamp(8px,3vw,16px);padding:8px 0;flex:1;min-height:0;overflow-y:auto}.ladder{display:flex;flex-direction:column;align-items:center;gap:var(--tile-gap);justify-content:flex-start}.row{display:grid;grid-template-columns:3.1rem auto 3.1rem;align-items:center;gap:8px}.row-tiles{display:flex;gap:var(--tile-gap);justify-self:center}.rlabel{font-family:var(--font-ui);font-size:10px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:#97a1a9;text-align:right;line-height:1.05;-webkit-user-select:none;user-select:none}.rlabel.target{color:var(--flag)}.rlabel.edit{color:var(--pine)}.rlabel.start{color:#8a949c}.rlabel-mirror{width:3.1rem;display:flex;align-items:center;justify-content:center}.row.goback{border:0;background:transparent;padding:0;margin:0;width:100%;font:inherit;cursor:pointer;border-radius:12px}.row.goback:hover{background:#c3cdd447}.row.goback:hover .row-tiles .tile{border-color:var(--ink)}.goback-hint{opacity:0;color:#8a949c;font-size:15px;transition:opacity .15s ease}.row.goback:hover .goback-hint,.row.goback:focus-visible .goback-hint{opacity:1}@keyframes settleDown{0%{transform:translateY(-12px);opacity:.25}to{transform:translateY(0);opacity:1}}.anim-settle{animation:settleDown .18s cubic-bezier(.22,1,.36,1)}.tile{position:relative;width:var(--tile);height:var(--tile);display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:calc(var(--tile) * .44);font-weight:500;text-transform:uppercase;letter-spacing:.02em;background:var(--paper);border:2px solid var(--stone);border-radius:10px;color:var(--ink);-webkit-user-select:none;user-select:none;transition:transform 90ms ease,opacity .12s ease,box-shadow .12s ease}.row-start .tile{background:transparent;border-color:var(--stone-soft);color:#6a7681}.row-earlier .tile{background:var(--paper);border-color:var(--stone);color:#45525d}.row-current .tile{border-color:var(--ink);border-width:2.5px;background:#fff;box-shadow:0 3px 10px #16212b1f}.row-current.has-sel .tile:not(.sel){opacity:.4}.row-current .tile.sel{border-color:var(--pine);border-width:3px;background:#dff0e8;color:var(--pine);transform:translateY(-3px) scale(1.06);box-shadow:0 0 0 4px #2f7a5c47,0 8px 16px #16212b29;z-index:2}.row-current .tile.sel:after{content:"";position:absolute;left:22%;right:22%;bottom:6px;height:3px;border-radius:2px;background:var(--pine);animation:caretBlink 1s steps(1,end) infinite}@keyframes caretBlink{50%{opacity:0}}.row-target .tile{background:transparent;border-color:var(--flag);color:var(--flag);border-width:2px}.rung-pine .tile{border-color:var(--pine);color:var(--pine);background:#2f7a5c17}.rung-brass .tile{border-color:var(--brass);color:var(--brass);background-image:repeating-linear-gradient(45deg,transparent,transparent 5px,rgba(184,134,47,.16) 5px,rgba(184,134,47,.16) 8px)}.row-current.won .tile,.rung-won .tile{border-color:var(--pine);background:var(--pine);color:#fff}.connector{display:flex;gap:5px;height:12px;align-items:center;justify-content:center;color:var(--stone-line)}.row-connector{margin:-2px 0}.connector span{width:4px;height:4px;border-radius:50%;background:currentColor}.gauge{position:relative;width:16px;align-self:stretch;display:flex;justify-content:center}.gauge .rule{position:absolute;top:4px;bottom:4px;width:2px;background:var(--stone-line)}.gauge .tick{position:absolute;left:50%;transform:translate(-50%);width:10px;height:2px;background:var(--stone-line)}.gauge .tick.par{width:14px;height:2px;background:var(--ink)}.gauge .tick.over{background:var(--brass)}.gauge .tick .lbl{position:absolute;right:16px;top:-7px;font-family:var(--font-mono);font-size:9px;color:#6a7681}.gauge .marker{position:absolute;left:50%;transform:translate(-50%,50%);width:12px;height:12px;border-radius:50%;background:var(--pine);border:2px solid var(--chalk);transition:bottom .18s 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shake{0%,to{transform:translate(0)}20%{transform:translate(-7px)}40%{transform:translate(7px)}60%{transform:translate(-5px)}80%{transform:translate(5px)}}@keyframes bounce{0%,to{transform:scale(1)}50%{transform:scale(.94)}}.anim-commit{animation:slideUp .18s cubic-bezier(.22,1,.36,1)}.anim-reject{animation:shake .12s ease-in-out 3}.anim-win .tile{animation:bounce .3s ease}@keyframes tapHint{0%,to{box-shadow:var(--shadow);border-color:var(--ink)}50%{box-shadow:0 0 0 4px #2f7a5c38;border-color:var(--pine)}}.row-current.await-first .tile{animation:tapHint 1.9s ease-in-out infinite}.toasts{position:fixed;left:50%;bottom:96px;transform:translate(-50%);display:flex;flex-direction:column;gap:8px;z-index:40;pointer-events:none}.toast{background:var(--ink);color:var(--chalk);padding:9px 16px;border-radius:8px;font-size:14px;font-weight:600;letter-spacing:.02em;box-shadow:var(--shadow);animation:slideUp .16s 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button:hover{background:var(--stone-soft)}.segment{display:flex;gap:6px;margin:8px 0 18px}.segment button{flex:1;padding:12px 8px;border:1px solid var(--stone-line);background:transparent;border-radius:10px;font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.segment button[aria-pressed=true]{background:var(--ink);color:var(--chalk);border-color:var(--ink)}.center-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;padding:30px}.loading-dot{width:14px;height:14px;border-radius:50%;background:var(--flag);animation:bounce .9s ease-in-out infinite}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.help-example{display:flex;justify-content:center;margin:10px 0 4px}.first-hint{text-align:center;font-size:13.5px;font-weight:600;letter-spacing:.01em;color:var(--pine);padding:2px 12px 0;animation:fadeInHint .4s ease}@keyframes fadeInHint{0%{opacity:0;transform:translateY(-3px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion: reduce){*{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.1s!important}.anim-commit,.anim-reject,.anim-win .tile{animation:fade .1s ease!important}@keyframes fade{0%{opacity:.6}to{opacity:1}}}