:root{--bg: #262421;--panel: #312e2b;--panel-raised: #3c3936;--border: #45423e;--text: #e8e6e3;--muted: #a09d98;--accent: #81b64c;--accent-hover: #95c95e;--danger: #e2574c;--board-size: min( calc(100vh - 190px) , 820px, calc(100vw - 640px) );color-scheme:dark;font-size:19px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;background:var(--bg);min-height:100vh}button{font:inherit;color:var(--text);background:var(--panel-raised);border:1px solid var(--border);border-radius:6px;padding:10px 16px;cursor:pointer}button:hover:not(:disabled){background:#4a4743}button:disabled{opacity:.45;cursor:default}button.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}button.primary:hover:not(:disabled){background:var(--accent-hover)}button.link{background:none;border:none;color:var(--muted)}select{font:inherit;color:var(--text);background:var(--panel-raised);border:1px solid var(--border);border-radius:6px;padding:4px 6px}code{background:var(--panel-raised);padding:1px 5px;border-radius:4px}.muted{color:var(--muted)}.app{max-width:1640px;margin:0 auto;padding:12px 16px 24px}header{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:12px}header h1{font-size:1.5rem;margin:0}.mode-switch{margin-left:auto;display:flex;gap:6px}.mode-switch button{padding:6px 14px}.mode-switch button.active{border-color:var(--accent);background:#3d4a31}.mode-switch .count{display:inline-grid;place-items:center;min-width:22px;height:22px;margin-left:6px;padding:0 5px;border-radius:999px;background:var(--accent);color:#fff;font-size:.75rem;font-weight:700}.opening-name{color:#c9a77c;font-weight:600}main{display:flex;gap:20px;align-items:flex-start}.board-area{display:flex;align-items:center;gap:8px;flex:none}.board-area.timed{--board-size: min( calc(100vh - 290px) , 820px, calc(100vw - 640px) )}.board-column{display:flex;flex-direction:column;gap:6px}.captures{display:flex;align-items:center;min-height:22px;padding:0 2px}.taken-piece{flex:none;width:22px;height:22px;margin-right:-4px}.material-edge{margin-left:10px;color:var(--muted);font-size:.85rem;font-weight:700;font-variant-numeric:tabular-nums}.game-clock{display:flex;align-items:center;justify-content:space-between;padding:4px 12px;border-radius:6px;background:var(--panel);color:var(--muted)}.game-clock.to-move{background:var(--panel-raised);color:var(--text);box-shadow:inset 0 0 0 1px var(--accent)}.game-clock.low.to-move{box-shadow:inset 0 0 0 1px var(--danger)}.game-clock.low .clock-time{color:var(--danger)}.clock-who{display:inline-flex;align-items:center;gap:8px}.clock-side{width:14px;height:14px;border-radius:3px;border:1px solid var(--border)}.clock-side.white{background:#eeeed2}.clock-side.black{background:#262421}.clock-time{font-size:1.4rem;font-weight:700;font-variant-numeric:tabular-nums}.segmented.time-controls{flex-wrap:wrap}.time-controls button{flex:1 0 22%;padding:8px 6px}.board{position:relative;width:var(--board-size);height:var(--board-size);border-radius:4px;overflow:hidden;box-shadow:0 4px 18px #00000059;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent}.board-caption{position:absolute;top:10px;left:50%;transform:translate(-50%);max-width:90%;background:#141414d9;color:#fff;padding:8px 14px;border-radius:8px;font-size:.95rem;text-align:center;z-index:5;pointer-events:none}.move-ref{display:inline;font:inherit;font-weight:700;color:#8cc8f0;background:none;border:none;border-bottom:1px dotted #8cc8f0;border-radius:0;padding:0;cursor:pointer}button.move-ref:hover:not(:disabled),button.move-ref:focus-visible{background:#4a9fd833;outline:none}.square-badge{position:absolute;top:-12%;right:-12%;min-width:42%;height:42%;padding:0 3px;border-radius:999px;border:2px solid #fff;display:grid;place-items:center;color:#fff;font-weight:800;font-size:calc(var(--board-size) / 8 * .22);line-height:1;box-shadow:0 1px 4px #0000008c;pointer-events:none;z-index:5}.square-badge.edge-top{top:2px}.square-badge.edge-right{right:2px}.promotion{position:absolute;top:0;right:0;bottom:0;left:0;background:#0009;display:grid;place-content:center;justify-items:center;gap:8px;z-index:10}.promotion-choices{display:flex;gap:8px}.promotion-choices button{width:calc(var(--board-size) / 8);height:calc(var(--board-size) / 8);padding:4px;background:#eeeed2}.promotion-choices button:hover{background:#f6f669}.eval-bar{position:relative;width:32px;height:var(--board-size);background:#403d39;border-radius:4px;overflow:hidden;display:flex;flex-direction:column-reverse}.eval-bar.flipped{flex-direction:column}.eval-white{background:#f0f0f0;transition:height .4s ease}.eval-label{position:absolute;left:0;right:0;text-align:center;font-size:13px;font-weight:700}.eval-label.on-white{bottom:4px;color:#403d39}.eval-label.on-black{top:4px;color:#f0f0f0}.eval-bar.flipped .eval-label.on-white{bottom:auto;top:4px}.eval-bar.flipped .eval-label.on-black{top:auto;bottom:4px}.side{flex:1;min-width:460px;height:max(var(--board-size),min(calc(100vh - 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var(--border)}.bubble.over{background:#2f3b26;font-weight:600}.bubble.error{border-left:3px solid var(--danger)}.typing:after{content:"…";display:inline-block;margin-left:2px;color:var(--muted);animation:typing 1.2s ease-in-out infinite}@keyframes typing{50%{opacity:.25}}.bubble.hint{border-left:3px solid #f0c03a}.bubble.opponent{border-left:3px solid var(--border)}.bubble-who{margin-left:auto;font-size:.8rem;color:var(--muted)}.hint-row{display:flex;align-items:center;gap:10px;font-size:.9rem}.hint-row button{padding:8px 14px}.hint-row .review-button{margin-left:auto}.coach-source{margin:0;font-size:.8rem;color:var(--muted)}.bubble-head{display:flex;align-items:center;gap:8px;margin-bottom:4px}.badge{display:inline-grid;place-items:center;min-width:28px;height:28px;padding:0 5px;border-radius:999px;color:#fff;font-size:14px;font-weight:800}.badge.small{min-width:20px;height:20px;font-size:11px;margin-right:4px}.controls{display:flex;flex-wrap:wrap;gap:8px}.controls 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var(--border)}.setting{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.9rem;color:var(--muted)}.setting label{display:flex;align-items:center;gap:6px}.setting input[type=checkbox]{accent-color:var(--accent)}.new-game h2{margin:0 0 12px;font-size:1.15rem}.new-game fieldset{border:none;margin:0 0 16px;padding:0}.new-game legend{color:var(--muted);margin-bottom:6px;font-size:.9rem}.segmented{display:flex;gap:6px}.segmented button{flex:1}.levels{display:grid;gap:4px}.levels button{display:flex;justify-content:space-between;text-align:left;padding:6px 12px}.levels button span{color:var(--muted)}.segmented button.active,.levels button.active{border-color:var(--accent);background:#3d4a31}.row{display:flex;gap:8px}.puzzles{flex:1;min-height:0;display:flex;flex-direction:column;gap:10px}.puzzle-summary{margin:0}.puzzle-item.due{box-shadow:inset 3px 0 0 var(--accent)}.due-now{color:var(--accent)}.play-on{margin-top:8px;padding-top:8px;border-top:1px solid var(--border)}.play-on 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calc(100vw - 72px) , 720px)}main{flex-direction:column;align-items:stretch}.board-area{align-self:center}.board-area.timed{--board-size: min( calc(100vw - 72px) , 720px)}.side{height:auto;min-width:0}.coach-feed{max-height:420px}.coach-feed-wrap{min-height:260px}}@media(max-width:760px){:root{font-size:16px;--board-size: min( calc(100vw - 38px) , calc(100vh - 230px) , 560px);--board-size: min( calc(100vw - 38px) , calc(100dvh - 230px) , 560px)}.app{padding:8px 8px 20px}header{gap:8px 12px;margin-bottom:8px}header h1{font-size:1.25rem}.mode-switch{width:100%;margin-left:0;flex-wrap:wrap}.mode-switch button{flex:1 0 auto;padding:10px 12px}.board-area{gap:4px}.board-area.timed{--board-size: min( calc(100vw - 38px) , calc(100vh - 330px) , 560px);--board-size: min( calc(100vw - 38px) , calc(100dvh - 330px) , 560px)}.eval-bar{width:20px}.eval-label{font-size:11px}.side{padding:10px 8px}.controls button{flex:1 0 40%}.mode-switch button,.controls button,.move-nav button,.coach-actions button,.row button,.segmented button{min-height:44px}.move-nav button{padding:10px 8px}.coach-feed{max-height:min(45vh,340px)}.coach-feed-wrap{min-height:180px}.challenges li{flex-wrap:wrap}.time-controls button{flex:1 0 30%}.review-table{font-size:.85rem}.review-table th,.review-table td{padding:3px 4px}.who-is-playing{padding:16px}}