:root{--bg: #1b1f24;--panel: #242a31;--line: #333c46;--ink: #e7ecf1;--muted: #9aa7b4;--accent: #6ea8fe;--black: #12161b;--white: #f2f4f7;--best: #3fb950;--good: #8bd450;--inacc: #e3b341;--mistake: #f0883e;--blunder: #f85149}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.45 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}button{font:inherit;cursor:pointer}header{display:flex;align-items:center;gap:20px;padding:14px 20px;border-bottom:1px solid var(--line)}header h1{font-size:19px;margin:0;font-weight:650;letter-spacing:.3px}header h1 .accent{color:var(--accent)}.tabs button{background:none;border:0;color:var(--muted);font-weight:600;padding:6px 10px;border-radius:6px}.tabs button.active{color:var(--ink);background:var(--panel)}.badge{margin-left:auto;font-size:12px;color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:4px 12px}main{display:flex;flex-wrap:wrap;gap:26px;padding:22px;align-items:flex-start}.board-area{display:flex;flex-direction:column}.board-row{display:flex;gap:12px;align-items:flex-start}.board{--sq: 54px;display:grid;grid-template-columns:repeat(8,var(--sq));grid-template-rows:repeat(8,var(--sq));background:#2f7d46;border:6px solid #24352a;border-radius:6px}.cell{border:1px solid #2a6b3d;display:flex;align-items:center;justify-content:center;position:relative}.cell.legal{cursor:pointer}.cell.legal:after{content:"";width:22%;height:22%;border-radius:50%;background:#ffffff52}.cell.legal:hover:after{background:#fff9}.disc{width:78%;height:78%;border-radius:50%;box-shadow:inset 0 -3px 6px #00000073,0 2px 3px #0006}.disc.black{background:radial-gradient(circle at 35% 30%,#3a444e,#12161b)}.disc.white{background:radial-gradient(circle at 35% 30%,#fff,#c9cfd6)}.cell.last{box-shadow:inset 0 0 0 3px var(--accent)}.cell.bestmove:before{content:"";position:absolute;top:8%;right:8%;bottom:8%;left:8%;border:3px dashed var(--best);border-radius:8px}.cell .glyph{position:absolute;top:0;right:3px;font-size:12px;font-weight:800}.evalbar{width:20px;background:var(--white);border-radius:4px;position:relative;overflow:hidden;border:1px solid var(--line)}.evalbar>div{position:absolute;left:0;right:0;bottom:0;background:var(--black);transition:height .35s ease}.evalbar>span{position:absolute;left:0;right:0;top:2px;text-align:center;font-size:9px;color:var(--muted);font-weight:800;text-shadow:0 0 2px #fff,0 0 2px #fff}.status{margin-top:10px;color:var(--muted);min-height:22px;max-width:430px}.board-legend{margin-top:6px;display:flex;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--muted)}.board-legend i{display:inline-block;width:14px;height:14px;border-radius:4px;vertical-align:-3px;margin-right:5px}.board-legend .lg-best{border:2px dashed var(--best)}.board-legend .lg-last{box-shadow:inset 0 0 0 2px var(--accent)}.board-legend .pv{background:var(--accent);color:#0b1220;border:0;border-radius:6px;padding:5px 12px;font-weight:700}.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;min-width:340px;flex:1;max-width:560px}.controls{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:12px}select,input[type=text]{background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:7px 9px;font:inherit}input[type=text]{flex:1;min-width:180px}button.primary{background:var(--accent);color:#0b1220;border:0;border-radius:6px;padding:8px 14px;font-weight:700}button.primary:disabled{opacity:.5;cursor:progress}.controls button:not(.primary){background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:8px 12px}.hint{color:var(--muted);font-size:12.5px}.start-title{margin:0 0 4px;font-size:16px}.color-choice{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}.color-choice button{padding:10px 16px;border-radius:8px;font-weight:700;background:var(--bg);color:var(--ink);border:1px solid var(--line)}.color-choice button.primary{background:var(--accent);color:#0b1220;border:0}.color-choice button:disabled{opacity:.5;cursor:not-allowed}.mh-title,.start-title{color:var(--ink)}.mh-title{font-size:13px;text-transform:uppercase;letter-spacing:.4px;color:var(--muted);margin:14px 0 4px}.mh-title .alt{text-transform:none;letter-spacing:0}.controls.nav{gap:6px}.controls.nav button{padding:6px 10px;min-width:34px}.controls.nav .spacer{flex:1}.engine-lines{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-bottom:10px}.engine-lines .pv{background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:4px 9px;font-variant-numeric:tabular-nums}.engine-lines .pv:hover{border-color:var(--accent)}.move-list-shared{list-style:none;margin:8px 0 0;padding:0;max-height:340px;overflow-y:auto;overscroll-behavior:contain;position:relative;font-variant-numeric:tabular-nums}.move-list-shared li{display:grid;grid-template-columns:30px 58px 1fr auto;gap:8px;align-items:center;padding:4px 6px;border-radius:5px;cursor:pointer}.move-list-shared li:hover{background:var(--bg)}.move-list-shared li.sel{background:var(--bg);outline:1px solid var(--accent)}.move-list-shared li.alt{display:block;color:var(--muted);cursor:default}.move-list-shared li.mv-end{display:block;padding:0;height:1px;cursor:default}.move-list-shared .n{color:var(--muted);text-align:right}.move-list-shared .mv{font-weight:700}.move-list-shared .note{color:var(--muted);font-size:12.5px}.move-list-shared .right{font-size:12px;font-weight:700}.move-list-shared .right:not(.label){color:var(--muted)}.label{font-weight:700;font-size:12px}.label.Best,.label.Excellent{color:var(--best)}.label.Good{color:var(--good)}.label.Inaccuracy{color:var(--inacc)}.label.Mistake{color:var(--mistake)}.label.Blunder{color:var(--blunder)}.eval-graph{width:100%;height:120px;background:var(--bg);border:1px solid var(--line);border-radius:8px;margin-bottom:10px;display:block}.eval-graph .mid{stroke:var(--line);stroke-width:1}.eval-graph .area{fill:#6ea8fe26}.eval-graph .line{fill:none;stroke:var(--accent);stroke-width:2}.eval-graph .cursor{stroke:var(--muted);stroke-width:1;stroke-dasharray:3 3}.eval-caption{margin:-4px 0 10px;font-size:11.5px;color:var(--muted)}.analysis-summary{margin-bottom:10px;font-size:12.5px;color:var(--muted)}.analysis-summary>div{margin:6px 0}.analysis-summary .strategy{font-size:11.5px;opacity:.85;margin:1px 0 0 14px}.learn-from{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:4px 0 10px}.learn-from button{background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:6px 11px;font-weight:600}.learn-from button.primary{background:var(--accent);color:#0b1220;border:0}.learn-from button:hover:not(:disabled){border-color:var(--accent)}.learn-from button:disabled{opacity:.5;cursor:progress}.gameover{margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}.go-actions{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0}.go-actions button:not(.primary){background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:8px 12px}.ft-result{margin-top:12px;padding:12px;background:var(--bg);border-radius:8px;font-size:13px}.ft-result table{width:100%;border-collapse:collapse}.ft-result td{padding:2px 4px}.ft-result td:last-child{text-align:right;font-variant-numeric:tabular-nums}.ft-result .chips{margin-top:8px;display:flex;gap:8px;flex-wrap:wrap}footer{display:flex;gap:14px;align-items:center;padding:12px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}footer code{color:var(--ink)}button.link{background:none;border:0;color:var(--accent);text-decoration:underline;margin-left:auto}.error{color:var(--blunder)}.api-down{margin:0;padding:10px 20px;font-size:13px;background:#3a1d1d;color:#f5c2c2;border-bottom:1px solid #5a2a2a}.api-down code{background:#ffffff1a;padding:1px 5px;border-radius:4px;color:#fff}@media(max-width:560px){.board{--sq: 38px}}