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reduce){.sandbox-tab,.pm-tab,.rail-icon-btn,.ws-exit{transition:none}}.piece-picker{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-3);align-content:start}.piece-picker-tile{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-3) var(--space-2);border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface-raised);color:var(--text-secondary);transition:color var(--dur-base) var(--ease),background-color var(--dur-base) var(--ease),border-color var(--dur-base) var(--ease)}.piece-picker-tile:hover:not(.is-active){color:var(--text-primary);background:var(--surface-hover);border-color:var(--border-strong)}.piece-picker-tile.is-active{color:var(--text-primary);border-color:var(--ai);box-shadow:0 0 0 1px var(--ai)}.piece-picker-pieces{display:flex;align-items:flex-end;justify-content:center;gap:var(--space-1);padding:var(--space-2) var(--space-3) 0;border-radius:var(--radius-sm);background:linear-gradient(90deg,var(--board-light) 0 50%,var(--board-dark) 50% 100%)}.piece-picker-label{font-size:var(--text-sm);font-weight:var(--weight-medium);line-height:var(--leading-snug)}@media (max-width: 360px){.piece-picker{grid-template-columns:minmax(0,1fr)}}@media (pointer: coarse){.piece-picker-tile{min-height:44px}}@media (prefers-reduced-motion: reduce){.piece-picker-tile{transition:none}}.level-picker{position:relative;display:inline-flex}.level-picker-trigger{display:inline-flex;align-items:center;gap:var(--space-2);min-height:32px;padding:var(--space-1) var(--space-3);border:1px solid var(--border);border-radius:var(--radius-xs);background:var(--surface-raised);color:var(--text-primary);font-family:var(--font-body);font-size:var(--text-xs);font-weight:var(--weight-medium);line-height:var(--leading-snug);white-space:nowrap;cursor:pointer;transition:background-color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease)}.level-picker-trigger:hover:not(:disabled),.level-picker.is-open .level-picker-trigger{background:var(--surface-hover);border-color:var(--border-strong)}.level-picker-trigger:disabled{opacity:.55;cursor:not-allowed}.level-picker-chevron{color:var(--text-muted);font-size:.8em}.level-picker-menu{position:fixed;z-index:2000;width:min(360px,calc(100vw - 2 * var(--space-4)));display:flex;flex-direction:column;padding:var(--space-1);border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);box-shadow:var(--elev-3);max-height:min(72vh,560px);overflow-y:auto}.level-picker-option{display:flex;flex-direction:column;gap:1px;padding:6px var(--space-3);border:1px solid transparent;border-radius:var(--radius-xs);text-align:left;color:var(--text-secondary);transition:background-color var(--dur-fast) var(--ease)}.level-picker-option:hover:not(.is-locked){background:var(--surface-hover);color:var(--text-primary)}.level-picker-option.is-active{background:var(--ai-soft);border-color:var(--ai);color:var(--text-primary)}.level-picker-option.is-active .level-picker-name:after{content:"✓";margin-left:auto;color:var(--ai)}.level-picker-name{display:flex;align-items:baseline;gap:var(--space-2);font-size:var(--text-sm);font-weight:var(--weight-medium);color:inherit}.level-picker-elo{font-family:var(--font-mono);font-size:var(--text-2xs);font-weight:var(--weight-regular);color:var(--text-muted)}.level-picker-blurb{font-size:var(--text-xs);line-height:var(--leading-snug);color:var(--text-muted)}.level-picker-option.is-locked{margin-top:var(--space-1);padding-top:var(--space-3);border-top:1px solid var(--border-soft);border-radius:0;cursor:default;color:var(--text-muted)}.level-picker-option.is-locked .level-picker-name{color:var(--text-secondary)}@media (pointer: coarse){.level-picker-trigger{min-height:44px}.level-picker-option{min-height:44px;justify-content:center}}@media (prefers-reduced-motion: reduce){.level-picker-trigger,.level-picker-option{transition:none}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-2);min-height:100%;padding:var(--space-8) var(--space-6);text-align:center}@media (max-width: 900px){.empty-state{min-height:0;justify-content:flex-start;padding:var(--space-6) var(--space-5)}}.empty-state-title{font-family:var(--font-display);font-size:var(--text-sm);font-weight:var(--weight-semibold);line-height:var(--leading-snug);color:var(--text-secondary)}.empty-state-body{max-width:34ch;font-size:var(--text-sm);line-height:var(--leading-normal);color:var(--text-secondary)}.empty-state-action{margin-top:var(--space-2)}.empty-state-thinking .empty-state-title{color:var(--warn)}.empty-state-dots{display:flex;gap:var(--space-1);align-items:center;margin-bottom:var(--space-1)}.empty-state-dots span{width:5px;height:5px;border-radius:50%;background:var(--warn);animation:waiting-wave 1.4s var(--ease) infinite both}.empty-state-dots span:nth-child(1){animation-delay:-.32s}.empty-state-dots span:nth-child(2){animation-delay:-.16s}.board-endstate{position:absolute;inset:0;z-index:8;display:flex;align-items:center;justify-content:center;padding:var(--space-4);box-sizing:border-box;border-radius:inherit;background:radial-gradient(ellipse at center,var(--endstate-core) 0%,var(--endstate-edge) 72%);animation:endstate-in var(--dur-base, .22s) var(--ease-out, ease-out)}.board-endstate.is-checkmate{--endstate-core: rgba(var(--danger-rgb), .62);--endstate-edge: rgba(var(--danger-rgb), .34);--endstate-ink: #fff3f4}.board-endstate.is-stalemate,.board-endstate.is-draw{--endstate-core: rgba(24, 27, 33, .62);--endstate-edge: rgba(24, 27, 33, .36);--endstate-ink: #f2f4f7}[data-theme=light] .board-endstate.is-stalemate,[data-theme=light] .board-endstate.is-draw{--endstate-core: rgba(38, 44, 54, .58);--endstate-edge: rgba(38, 44, 54, .32)}.board-endstate-card{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);text-align:center;max-width:100%}.board-endstate-headline{margin:0;font-size:clamp(1.35rem,calc(var(--board-size, 440px) * .115),3.25rem);line-height:1;font-weight:800;letter-spacing:.02em;color:var(--endstate-ink);text-shadow:0 2px 14px rgba(0,0,0,.55)}.board-endstate-detail{margin:0;font-size:clamp(.72rem,calc(var(--board-size, 440px) * .028),.95rem);line-height:1.35;color:var(--endstate-ink);opacity:.92;text-shadow:0 1px 8px rgba(0,0,0,.5);max-width:30ch}.board-endstate-reset{margin-top:var(--space-2);min-height:44px;padding:0 var(--space-5);border-radius:var(--radius-sm, 8px);border:1px solid rgba(255,255,255,.55);background:#fffffff0;color:#14171d;font-size:.95rem;font-weight:650;cursor:pointer;box-shadow:0 6px 18px #00000059;transition:transform var(--dur-fast, .12s) var(--ease-out, ease-out),background var(--dur-fast, .12s) var(--ease-out, ease-out)}.board-endstate-reset:hover{background:#fff;transform:translateY(-1px)}.board-endstate-reset:active{transform:translateY(0)}.board-endstate-reset:focus-visible{outline:3px solid var(--endstate-ink);outline-offset:3px}.board-endstate-secondary{min-height:44px;padding:0 var(--space-5);border-radius:var(--radius-sm, 8px);border:1px solid rgba(255,255,255,.7);background:#00000038;color:var(--endstate-ink);font-size:.9rem;font-weight:600;cursor:pointer;text-shadow:0 1px 6px rgba(0,0,0,.45);transition:background var(--dur-fast, .12s) var(--ease-out, ease-out),transform var(--dur-fast, .12s) var(--ease-out, ease-out)}.board-endstate-secondary:hover:not(:disabled){background:#ffffff2e;transform:translateY(-1px)}.board-endstate-secondary:active:not(:disabled){transform:translateY(0)}.board-endstate-secondary:disabled{cursor:progress;opacity:.85}.board-endstate-secondary:focus-visible{outline:3px solid var(--endstate-ink);outline-offset:3px}.board-endstate-hint,.board-endstate-error{margin:0;font-size:clamp(.66rem,calc(var(--board-size, 440px) * .024),.82rem);line-height:1.3;color:var(--endstate-ink);opacity:.88;text-shadow:0 1px 6px rgba(0,0,0,.5);max-width:30ch}.board-endstate-error{opacity:1;font-weight:600}@media (max-width: 560px){.board-endstate-hint{display:none}}@keyframes endstate-in{0%{opacity:0}to{opacity:1}}@media (max-width: 560px){.board-endstate-detail{max-width:24ch}}.promotion-scrim{position:absolute;inset:var(--space-3);z-index:30;background:#0000006b;border-radius:var(--radius-xs);animation:promotion-fade var(--cp-t-base, .22s) var(--ease, ease) both}@keyframes promotion-fade{0%{opacity:0}to{opacity:1}}.promotion-picker{position:absolute;display:flex;flex-direction:column;background:var(--surface-raised);border-radius:var(--radius-sm);box-shadow:var(--elev-3);overflow:hidden;animation:promotion-open var(--cp-t-base, .22s) var(--ease, ease) both}.promotion-picker.grows-down{transform-origin:top center}.promotion-picker.grows-up{transform-origin:bottom center}@keyframes promotion-open{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.promotion-option{display:flex;align-items:center;justify-content:center;width:100%;padding:0;border:none;border-bottom:1px solid var(--border);background:transparent;color:var(--text-primary);font-family:var(--font-body);font-size:var(--text-sm);cursor:pointer;transition:background var(--cp-t-base, .22s) var(--ease, ease)}.promotion-option:last-child{border-bottom:none}.promotion-option:hover{background:var(--surface-hover)}.promotion-option:active{background:var(--surface-active)}.promotion-option:focus-visible{outline:2px solid var(--focus-ring);outline-offset:-3px}.promotion-option svg{display:block}@media (pointer: coarse){.promotion-option{min-height:34px}}.coach-style-entry .actions-note{display:grid;gap:3px}.coach-style-entry .actions-note strong{color:var(--text-primary);font-weight:650}.coach-style-open{min-width:104px}.coach-style-backdrop{position:fixed;inset:0;z-index:2000;display:grid;place-items:center;padding:24px;background:color-mix(in srgb,#05070b 76%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.coach-style-modal{width:min(780px,100%);max-height:min(820px,calc(100dvh - 32px));overflow:auto;border:1px solid var(--border);border-radius:18px;padding:24px;color:var(--text-primary);background:var(--surface-raised);box-shadow:0 28px 80px #0000007a,0 0 0 1px color-mix(in srgb,var(--ai) 8%,transparent)}.coach-style-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.coach-style-kicker{margin:0 0 5px;color:var(--ai);font-size:.8rem;font-weight:650}.coach-style-head h2{margin:0;font-size:1.45rem}.coach-style-head p:not(.coach-style-kicker){margin:7px 0 0;max-width:590px;color:var(--text-secondary);line-height:1.5}.coach-style-close{flex:0 0 auto;width:38px;height:38px;border:1px solid var(--border);border-radius:10px;color:var(--text-secondary);background:var(--surface);font:inherit;font-size:1.5rem;cursor:pointer}.coach-style-values{display:flex;flex-wrap:wrap;gap:10px 24px;margin:14px 0 10px;padding:10px 14px;border:1px solid var(--border);border-radius:11px;background:var(--surface-sunken);color:var(--text-secondary)}.coach-style-values strong{color:var(--text-primary)}.coach-style-preview{margin:0 0 14px;padding:12px 16px;border:1px solid color-mix(in srgb,var(--ai) 35%,var(--border));border-left-width:4px;border-radius:11px;background:color-mix(in srgb,var(--ai) 6%,var(--surface-sunken))}.coach-style-preview figcaption{display:flex;flex-wrap:wrap;gap:8px;align-items:baseline;margin-bottom:6px;color:var(--text-secondary);font-size:.82rem;font-weight:650}.coach-style-preview figcaption span{color:var(--text-muted);font-weight:400}.coach-style-preview blockquote{margin:0;color:var(--text-primary);font-size:1.02rem;line-height:1.45;min-height:2.9em}.coach-style-main{display:grid;grid-template-columns:minmax(260px,1fr) minmax(250px,1fr);gap:32px;align-items:center}.coach-plane-wrap{position:relative;padding:22px 0 21px}.coach-plane{position:relative;aspect-ratio:1;overflow:visible;touch-action:none;cursor:crosshair;border:1px solid color-mix(in srgb,var(--ai) 42%,var(--border));border-radius:14px;background:linear-gradient(to right,transparent calc(50% - .5px),color-mix(in srgb,var(--text-muted) 22%,transparent) 50%,transparent calc(50% + .5px)),linear-gradient(to bottom,transparent calc(50% - .5px),color-mix(in srgb,var(--text-muted) 22%,transparent) 50%,transparent calc(50% + .5px)),repeating-linear-gradient(to right,transparent 0 calc(10% - 1px),color-mix(in srgb,var(--text-muted) 10%,transparent) calc(10% - 1px) 10%),repeating-linear-gradient(to bottom,transparent 0 calc(10% - 1px),color-mix(in srgb,var(--text-muted) 10%,transparent) calc(10% - 1px) 10%),linear-gradient(135deg,color-mix(in srgb,var(--surface-sunken) 94%,var(--ai)),var(--surface-sunken))}.coach-plane-glow{position:absolute;inset:0;border-radius:inherit;pointer-events:none;background:radial-gradient(circle at 72% 22%,color-mix(in srgb,var(--ai) 13%,transparent),transparent 48%)}.coach-point{position:absolute;z-index:2;width:24px;height:24px;padding:0;transform:translate(-50%,50%);border:3px solid var(--surface-raised);border-radius:50%;background:var(--ai);cursor:grab;box-shadow:0 0 0 2px var(--ai),0 5px 18px color-mix(in srgb,var(--ai) 45%,transparent)}.coach-point:active{cursor:grabbing}.coach-point:focus-visible,.coach-style-modal button:focus-visible,.coach-style-modal input:focus-visible{outline:2px solid var(--ai);outline-offset:3px}.coach-axis-x{display:flex;justify-content:space-between;margin-top:8px;color:var(--text-secondary);font-size:.76rem}.coach-axis-y{position:absolute;left:0;right:0;text-align:center;color:var(--text-secondary);font-size:.76rem}.coach-axis-top{top:0}.coach-axis-bottom{bottom:0}.coach-sliders{display:grid;gap:22px}.coach-sliders label>span{display:flex;justify-content:space-between;gap:12px;margin-bottom:9px}.coach-sliders output{color:var(--ai);font-variant-numeric:tabular-nums}.coach-sliders small{display:block;margin-top:7px;color:var(--text-muted);line-height:1.35}.coach-sliders input[type=range]{width:100%;height:5px;appearance:none;border-radius:99px;background:color-mix(in srgb,var(--ai) 30%,var(--surface-sunken));cursor:pointer}.coach-sliders input[type=range]::-webkit-slider-thumb{width:18px;height:18px;appearance:none;border:3px solid var(--surface-raised);border-radius:50%;background:var(--ai);box-shadow:0 0 0 1px var(--ai)}.coach-sliders input[type=range]::-moz-range-thumb{width:14px;height:14px;border:3px solid var(--surface-raised);border-radius:50%;background:var(--ai);box-shadow:0 0 0 1px var(--ai)}.coach-presets{display:grid;gap:9px}.coach-presets>span{color:var(--text-secondary);font-size:.82rem;font-weight:650}.coach-presets>div{display:flex;flex-wrap:wrap;gap:7px}.coach-presets button{border:1px solid var(--border);border-radius:999px;padding:7px 10px;color:var(--text-secondary);background:var(--surface);font:inherit;font-size:.76rem;cursor:pointer}.coach-presets button.is-active{border-color:color-mix(in srgb,var(--ai) 62%,var(--border));color:var(--ai);background:color-mix(in srgb,var(--ai) 10%,var(--surface))}.coach-style-footer{display:flex;justify-content:space-between;gap:12px;margin-top:16px;padding-top:14px;border-top:1px solid var(--border)}.coach-style-done{border-color:color-mix(in srgb,var(--ai) 55%,var(--border));color:var(--ai)}@media (max-width: 640px){.coach-style-backdrop{padding:8px;align-items:end}.coach-style-modal{max-height:calc(100dvh - 12px);padding:18px;border-radius:16px 16px 8px 8px}.coach-style-main{grid-template-columns:1fr;gap:20px}.coach-plane-wrap{width:min(100%,360px);margin:auto}.coach-style-values{flex-direction:column;gap:4px;margin:14px 0}.coach-style-preview{margin-bottom:14px}.coach-style-preview blockquote{font-size:.95rem}.coach-style-footer .action-btn{min-height:44px}}.sandbox-error{background:rgba(var(--cp-danger-rgb),.12);box-shadow:inset 0 0 0 1px rgba(var(--cp-danger-rgb),.35);color:var(--cp-danger);border-radius:var(--cp-radius-sm);padding:var(--space-3) var(--space-4);font-size:var(--text-sm);line-height:var(--leading-snug)}.sandbox-board-wrapper{width:calc(var(--board-size, 440px) + (2 * var(--space-3)));aspect-ratio:1;height:auto;box-sizing:border-box;border-radius:var(--radius-lg);box-shadow:var(--elev-3);background:var(--board-frame);padding:var(--space-3);position:relative;display:flex;align-items:center;justify-content:center}.sandbox-thinking{box-shadow:var(--cp-emboss-out),0 0 0 1px rgba(var(--cp-warn-rgb),.45)}.sandbox-booting{color:var(--text-muted);font-size:var(--text-base);font-style:italic}.sandbox-play-btn{background:var(--cp-primary);color:var(--cp-on-primary);box-shadow:var(--cp-glow-primary)}.sandbox-nav-btn{background:var(--surface-raised);color:var(--cp-text);box-shadow:var(--cp-emboss-out-sm)}.sandbox-takeover-btn{background:var(--surface-raised);color:var(--text-secondary);box-shadow:var(--cp-emboss-out-sm)}.sandbox-takeover-btn.is-on{background:var(--surface-active);color:var(--text-primary);box-shadow:var(--inset-1)}.sandbox-meta{display:flex;gap:var(--space-2);align-items:center;flex-wrap:wrap;font-size:var(--text-xs);color:var(--text-muted)}.sandbox-meta-item{background:var(--surface-raised);box-shadow:var(--cp-emboss-out-sm);border-radius:var(--radius-pill);padding:var(--space-1) var(--space-3)}.sandbox-meta-line{font-family:var(--font-mono);max-width:var(--board-size, 440px);overflow-x:auto;min-height:1.6em;box-sizing:border-box;white-space:nowrap}.sandbox-empty{margin:0;color:var(--text-muted);font-size:var(--text-sm);font-style:italic;text-align:center;padding:14px 0}.sandbox-ply{background:var(--cp-surface);border-radius:var(--cp-radius-sm);box-shadow:var(--cp-emboss-out-sm);padding:12px 14px;display:flex;flex-direction:column;gap:7px}.sandbox-ply-head{display:flex;align-items:center;gap:9px}.sandbox-ply-num{font-family:var(--cp-font-mono);font-size:11px;color:var(--cp-text-dim);min-width:18px}.sandbox-ply-san{font-family:var(--cp-font-mono);font-size:15px;font-weight:600;color:var(--cp-text)}.sandbox-ply-source{margin-left:auto;font-size:10px;letter-spacing:.1em;text-transform:none;border-radius:var(--cp-radius-pill);padding:3px 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