:root{color-scheme:dark;--theme-color:#070b12;--bg:#070b12;--panel:#0b111a;--line:#243241;--ink:#e8f0f7;--muted:#748394;--cyan:#64e6e0;--orange:#ffb45c;--board:#172331;--hole:#091018}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}body{display:flex;justify-content:center}.page{width:min(700px,100%);padding:22px 16px max(22px,env(safe-area-inset-bottom))}.topbar{height:44px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin-bottom:14px}.topbar h1{font-size:22px;letter-spacing:.16em;margin:0}.topbar a,.topbar button{border:0;background:none;color:var(--muted);font:10px inherit;letter-spacing:.1em;text-decoration:none;padding:12px 0;cursor:pointer;min-height:44px}.topbar button{text-align:right}.settings{display:grid;grid-template-columns:1fr 1fr 1.1fr;gap:8px;margin-bottom:12px}.settings>*{min-width:0;border:1px solid var(--line);background:var(--panel);padding:8px 10px;color:var(--muted);font-size:8px;letter-spacing:.08em;display:flex;flex-direction:column;gap:4px}.settings select{border:0;background:transparent;color:var(--ink);font:700 11px inherit;padding:0}.record b{color:var(--ink);font-size:11px;white-space:nowrap}.record i{font-style:normal;color:var(--cyan)}.game-shell{border:1px solid var(--line);background:var(--panel);padding:10px;box-shadow:0 15px 50px #0008}.turn{height:34px;display:flex;align-items:center;gap:8px;color:var(--muted);font-size:9px;letter-spacing:.08em}.turn>span{width:9px;height:9px;border-radius:50%;background:var(--cyan)}.turn b{color:var(--ink)}#undoButton{margin-left:auto;border:1px solid var(--line);background:transparent;color:var(--muted);font:9px inherit;padding:6px 10px;cursor:pointer;touch-action:manipulation}#undoButton:disabled{opacity:.35;cursor:not-allowed}.column-controls{display:grid;grid-template-columns:repeat(7,1fr);gap:5px;margin:3px 5px 6px}.column-controls button{min-width:0;border:1px solid transparent;background:transparent;color:var(--muted);font:17px inherit;padding:5px 0;cursor:pointer;touch-action:manipulation}.column-controls button:hover:not(:disabled){color:var(--cyan);border-color:var(--line)}.column-controls button:disabled{opacity:.2}.board-wrap{position:relative}.result-overlay{position:absolute;inset:0;background:#070b12e8;display:none;flex-direction:column;align-items:center;justify-content:center;gap:13px;text-align:center;padding:20px}.result-overlay.show{display:flex}.result-overlay b{font-size:clamp(22px,6vw,32px);letter-spacing:.14em}.result-overlay span{color:var(--muted);font-size:9px;letter-spacing:.09em}.result-overlay button{border:0;background:var(--cyan);color:#071014;padding:12px 22px;min-height:44px;font:700 10px inherit;letter-spacing:.1em;cursor:pointer}[data-theme="light"] .result-overlay{background:#faf8efe8}.board{display:grid;grid-template-columns:repeat(7,1fr);gap:7px;background:var(--board);border:1px solid var(--line);padding:10px;touch-action:manipulation;cursor:pointer}.cell{aspect-ratio:1;border-radius:50%;background:var(--hole);border:1px solid var(--line)}.cell.human{background:var(--cyan);border-color:var(--cyan)}.cell.computer{background:var(--orange);border-color:var(--orange)}.legend{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-top:12px;color:var(--muted);font-size:8px;letter-spacing:.07em}.legend span{display:flex;align-items:center;gap:6px}.legend i{width:9px;height:9px;border-radius:50%}.legend .human{background:var(--cyan)}.legend .computer{background:var(--orange)}footer{border-top:1px solid var(--line);margin-top:18px;padding-top:12px;text-align:center;color:var(--muted);font-size:8px;letter-spacing:.06em}[data-theme="light"]{color-scheme:light;--theme-color:#faf8ef;--bg:#faf8ef;--panel:#f1eee7;--line:#d8d0c5;--ink:#3e3934;--muted:#8b8177;--cyan:#4f9294;--orange:#d57d43;--board:#d8d1c5;--hole:#faf8ef}[data-theme="light"] .game-shell{box-shadow:0 15px 45px #51483b18}@media(max-width:560px){.page{padding:9px 10px 16px}.topbar{height:40px;margin-bottom:8px}.topbar h1{font-size:18px}.settings{gap:5px;margin-bottom:8px}.settings>*{padding:6px;font-size:7px}.settings select,.record b{font-size:9px}.game-shell{padding:6px}.turn{height:30px}.board{gap:4px;padding:6px}.column-controls{gap:2px;margin-inline:3px}.legend{gap:12px}footer{margin-top:12px}}@media(max-width:370px){.settings{grid-template-columns:1fr 1fr}.record{grid-column:1/-1}.topbar a,.topbar button{font-size:9px}.topbar h1{font-size:16px}}