:root{--bg: #171a1f;--surface: #222831;--surface-soft: #2b323d;--text: #f5f7fa;--ink: #f5f7fa;--muted: #aeb7c5;--line: #424b57;--board: #2f8f55;--board-dark: #17603a;--board-grid: rgba(15, 55, 35, .46);--disc-black: #15191d;--disc-white: #f4f1ea;--probe-board: #e6a500;--probe-legality: #ff6655;--probe-preference: #13a99a;--probe-logits: #8a95a3;--shadow: 0 18px 50px rgba(0, 0, 0, .26);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-width:320px;background:linear-gradient(90deg,rgba(174,183,197,.06) 1px,transparent 1px) 0 0 / 64px 64px,linear-gradient(0deg,rgba(174,183,197,.04) 1px,transparent 1px) 0 0 / 64px 64px,var(--bg)}button,input{font:inherit}.app-shell{width:min(1480px,calc(100vw - 40px));margin:0 auto;padding:24px 0 28px}.app-header{display:grid;grid-template-columns:minmax(270px,.72fr) minmax(360px,1.7fr);gap:20px;align-items:start;margin-bottom:14px}.brand-block{display:flex;align-items:center;gap:12px;min-height:78px}.brand-mark{width:42px;height:42px;border:2px solid var(--text);border-radius:50%;position:relative;background:var(--surface)}.brand-mark span{position:absolute;width:22px;height:22px;left:5px;top:9px;border-radius:50%;background:var(--disc-black);box-shadow:14px 2px 0 var(--disc-white),14px 2px 0 1px #10182040}.brand-block h1{margin:0;font-size:clamp(2rem,3vw,2.55rem);line-height:.95;letter-spacing:0;white-space:nowrap}.brand-block p{margin:4px 0 0;color:var(--muted);font-weight:650}.move-form label{font-weight:700}.move-input-row{display:flex;gap:10px;margin-top:8px}.move-input-row input{width:100%;border:1px solid var(--line);border-radius:8px;padding:16px 18px;background:var(--surface);font-size:18px;color:var(--text);box-shadow:inset 0 1px #ffffff14}.input-error{margin:8px 0 0;color:var(--probe-legality);font-weight:650}.runtime-loading{margin:8px 0 16px;color:var(--muted);font-weight:700}.status-strip{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px}.status-strip span{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:999px;background:var(--surface);padding:6px 11px;color:var(--muted);font-size:13px;font-weight:700}.status-strip .status-good{color:#5dd7c9;border-color:#13a99a59}.status-strip .status-warn{color:#ff968a;border-color:#f656}.main-grid{display:grid;grid-template-columns:minmax(480px,1.05fr) minmax(390px,.95fr);gap:28px;align-items:start}.board-panel{min-width:0}.board-coordinates{color:var(--text);font-weight:750}.board-coordinates-top{display:grid;grid-template-columns:32px repeat(8,1fr);width:100%;margin-bottom:6px;text-align:center;font-size:18px}.board-wrap{display:grid;grid-template-columns:32px 1fr;align-items:stretch}.board-coordinates-left{display:grid;grid-template-rows:repeat(8,1fr);align-items:center;justify-items:start;font-size:18px}.board-grid{aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);border:7px solid var(--board-dark);border-radius:8px;overflow:hidden;background:var(--board);box-shadow:var(--shadow)}.board-cell{position:relative;display:grid;place-items:center;border:0;border-right:1px solid var(--board-grid);border-bottom:1px solid var(--board-grid);background:radial-gradient(circle at 30% 25%,rgba(255,255,255,.12),transparent 34%),var(--board);cursor:pointer;min-width:0}.board-cell:hover,.board-cell.is-selected{box-shadow:inset 0 0 0 3px #ffffff73}.board-cell.has-board-mismatch{background:repeating-linear-gradient(135deg,rgba(255,102,85,.24) 0,rgba(255,102,85,.24) 5px,transparent 5px,transparent 12px),radial-gradient(circle at 30% 25%,rgba(255,255,255,.12),transparent 34%),var(--board)}.board-cell.is-directional-line:before{content:"";position:absolute;z-index:0;inset:0;background:#2563eb3d;pointer-events:none}.board-cell>:not(.directional-overlay){position:relative;z-index:1}.disc{width:62%;height:62%;border-radius:50%;display:block;box-shadow:0 7px 12px #00000042}.disc-black{background:radial-gradient(circle at 32% 24%,#333b42,var(--disc-black) 58%)}.disc-white{background:radial-gradient(circle at 32% 24%,#fff,var(--disc-white) 62%)}.legal-dot,.preference-marker{position:absolute;width:23%;height:23%;border-radius:50%}.simulator-dot{background:#064e2f}.preference-marker{border:3px solid var(--probe-preference);background:#ffffff29;box-shadow:0 0 0 4px #13a99a24}.logit-rank{position:absolute;top:8%;right:8%;display:grid;min-width:20px;min-height:20px;place-items:center;border-radius:999px;padding:2px;color:#fff;font-size:clamp(9px,1.2vw,12px);font-weight:850;line-height:1}.logit-rank.matches-probe{background:var(--probe-logits)}.logit-rank.differs-from-probe{background:var(--probe-legality)}.preference-rank{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);color:#fff;font-size:12px;font-weight:800;text-shadow:0 1px 2px rgba(0,0,0,.45)}.board-cell.is-probe-choice{box-shadow:inset 0 0 0 4px var(--probe-preference)}.board-cell.is-final-choice{outline:4px dashed var(--probe-logits);outline-offset:-8px}.board-cell.is-directional-target{z-index:2}.directional-overlay{position:absolute;z-index:3;top:-100%;left:-100%;display:grid;width:300%;height:300%;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);pointer-events:none}.directional-score,.directional-target{display:grid;place-content:center;text-align:center}.directional-score{gap:1px;color:rgb(37 99 235 / calc(.28 + var(--directional-score, 0) * .68));text-shadow:0 1px 1px rgb(255 255 255 / .45)}.directional-score i{display:block;font-family:Arial,sans-serif;font-size:clamp(23px,4vw,42px);font-style:normal;font-weight:900;line-height:.75;transform:rotate(var(--directional-angle))}.directional-score em{font-size:clamp(8px,1.1vw,11px);font-style:normal;font-weight:800}.directional-score.active{color:#1d4ed8}.directional-target{visibility:hidden}.selected-label{position:absolute;bottom:6px;left:50%;transform:translate(-50%);border-radius:999px;padding:2px 6px;color:var(--surface);background:var(--probe-preference);font-size:10px;font-weight:800}.mismatch-flag{position:absolute;right:9%;top:9%;width:11%;height:11%;border-radius:50%;background:var(--probe-legality);box-shadow:0 0 0 3px #ff665538}.board-legend{display:flex;flex-wrap:wrap;gap:24px;margin:12px 0 0 32px;color:var(--muted);font-weight:650}.board-legend span{display:inline-flex;align-items:center;gap:8px}.board-legend .directional-legend{color:#7db1ff;font-size:12px}.board-legend .logit-legend{color:var(--probe-logits);font-size:12px}.legend-disc,.legend-dot,.legend-ring{width:20px;height:20px;border-radius:50%;display:inline-block}.legend-disc.black{background:var(--disc-black)}.legend-disc.white{border:1px solid #b9b7ae;background:var(--disc-white)}.legend-dot{width:14px;height:14px;background:#064e2f}.legend-ring{border:3px solid var(--probe-preference)}.side-stack{display:grid;gap:16px}.inspector-card,.probe-rail{border:1px solid var(--line);border-radius:8px;background:#222831f0;box-shadow:var(--shadow)}.inspector-card{padding:20px}.eyebrow{margin:0 0 4px;color:var(--probe-preference);text-transform:uppercase;font-size:12px;font-weight:800}.eyebrow.legality{color:var(--probe-legality)}h2{margin:0;font-size:21px}.muted{color:var(--muted)}.score-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:16px 0 0}.score-grid div{border-top:1px solid var(--line);padding-top:10px}.score-grid dt{color:var(--muted);font-size:12px;font-weight:800}.score-grid dd{margin:4px 0 0;font-weight:750}.probe-rail{position:relative;min-height:182px;margin:0 0 24px;padding:42px 24px 24px;overflow:visible}.wire-field{position:absolute;inset:0;opacity:.32;pointer-events:none}.wire{position:absolute;height:1px;left:24px;right:24px;background:var(--line)}.wire:before,.wire:after{content:"";position:absolute;width:7px;height:7px;top:-3px;border-radius:50%;background:currentColor}.wire:before{left:12%}.wire:after{right:8%}.wire-board{top:36px;color:var(--probe-board);background:linear-gradient(90deg,transparent,var(--probe-board),transparent)}.wire-legality{top:92px;color:var(--probe-legality);background:linear-gradient(90deg,transparent,var(--probe-legality),transparent)}.wire-preference{top:146px;color:var(--probe-preference);background:linear-gradient(90deg,transparent,var(--probe-preference),transparent)}.rail-track{position:relative;z-index:1;display:grid;grid-template-columns:repeat(10,minmax(72px,1fr));gap:10px;align-items:start}.rail-stage-wrap{position:relative;display:grid;justify-items:center;gap:8px;min-width:0}.rail-stage{width:66px;height:50px;display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--text);font-weight:850;cursor:pointer}.rail-stage.active{transform:translateY(-2px)}.rail-stage-wrap p{margin:0;min-height:34px;text-align:center;color:var(--text);font-size:12px;font-weight:750}.rail-tooltip{position:absolute;z-index:2;bottom:calc(100% + 12px);left:50%;width:max-content;max-width:min(280px,80vw);padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#2b323d;box-shadow:var(--shadow);color:var(--ink);font-size:12px;font-weight:650;line-height:1.4;text-align:left;pointer-events:none;opacity:0;transform:translate(-50%,4px);transition:opacity .12s ease,transform .12s ease}.rail-stage-wrap:has(.rail-stage:hover) .rail-tooltip,.rail-stage-wrap:has(.rail-stage:focus-visible) .rail-tooltip{opacity:1;transform:translate(-50%)}.tone-board{border-color:var(--probe-board);box-shadow:0 0 0 4px #e6a5001f}.tone-legality{border-color:var(--probe-legality);box-shadow:0 0 0 4px #ff66551f}.tone-preference{border-color:var(--probe-preference);box-shadow:0 0 0 4px #13a99a1f}.tone-logits{border-color:var(--probe-logits)}.rail-connector{position:absolute;width:16px;height:1px;top:25px;right:-13px;background:var(--probe-logits)}@media(max-width:1060px){.app-header,.main-grid{grid-template-columns:1fr}.rail-track{grid-template-columns:repeat(5,minmax(72px,1fr))}}@media(max-width:620px){.app-shell{width:min(100vw - 20px,620px);padding-top:14px}.brand-block h1{font-size:32px}.board-coordinates-top{grid-template-columns:24px repeat(8,1fr);font-size:14px}.board-wrap{grid-template-columns:24px 1fr}.board-coordinates-left{font-size:14px}.selected-label,.preference-rank{font-size:9px}.score-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:no-preference){.board-cell.is-probe-choice .preference-marker{animation:pulseChoice 1.8s ease-in-out infinite}@keyframes pulseChoice{0%,to{box-shadow:0 0 0 4px #13a99a24}50%{box-shadow:0 0 0 9px #13a99a1a}}}