:root{--board:min(960px, calc(100vh - 210px));--board-row:calc(var(--board) + 28px);--bg:#fff;--surface:#fff;--subtle:#f6f6f4;--border:#ebebe8;--text:#1d1d1b;--muted:#8a8a85;--accent:#1d1d1b;--green:#15781b;--best:#2e8b57;--excellent:#5a9a4a;--good:#7a8f6a;--book:#a88865;--inaccuracy:#d4a017;--mistake:#e07b2a;--blunder:#c33;--radius:10px;--hover:#ecece8;--border-strong:#dcdcd8;--input-focus:#c8c8c3;--avatar-bot:#2b2b29;--backdrop:#14141240;--shadow:0 20px 60px #00000026;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}:root[data-theme=dark]{--bg:#161614;--surface:#1e1e1c;--subtle:#262624;--border:#31312e;--text:#ececea;--muted:#8f8f89;--accent:#ececea;--green:#4caf50;--hover:#2e2e2b;--border-strong:#42423e;--input-focus:#55554f;--avatar-bot:#3a3a37;--backdrop:#0000008c;--shadow:0 20px 60px #00000080;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);margin:0}button{font:inherit;color:inherit}.app{flex-direction:column;min-height:100vh;display:flex}.layout{grid-template-columns:minmax(0, var(--board-row)) 480px;flex:1;place-content:center;align-items:start;gap:32px;width:100%;margin:0 auto;padding:20px 28px;display:grid}.board-col{flex-direction:column;align-items:center;gap:10px;min-width:0;display:flex}.board-row{width:100%;max-width:var(--board-row);gap:10px;display:flex}.board-wrap{flex:1;min-width:0;position:relative}.result-overlay{pointer-events:none;z-index:5;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.result-card{text-align:center;color:#f5f5f2;background:#1e1c1ae0;border-radius:12px;padding:16px 28px;box-shadow:0 8px 30px #0006}.result-score{font-size:28px;font-weight:700;line-height:1.2}.result-text{margin-top:4px;font-size:15px;font-weight:600}.square-label{opacity:.85;pointer-events:none;-webkit-user-select:none;user-select:none;z-index:0;font-size:10px;font-weight:600;line-height:1;position:absolute;bottom:1px;left:3px}.eval-bar{background:#403d39;border-radius:4px;flex-shrink:0;width:18px;position:relative;overflow:hidden}.eval-bar-white{background:#f5f5f2;transition:height .4s;position:absolute;left:0;right:0}.eval-bar-white.bottom{bottom:0}.eval-bar-white.top{top:0}.eval-bar-label{text-align:center;writing-mode:horizontal-tb;font-size:9px;font-weight:700;position:absolute;left:0;right:0}.eval-bar-label.bottom{bottom:4px}.eval-bar-label.top{top:4px}.eval-bar-label.on-white{color:#403d39}.eval-bar-label.on-black{color:#f5f5f2}.controls{width:100%;max-width:var(--board-row);flex-wrap:wrap;justify-content:flex-start;gap:8px;margin-top:8px;padding-left:28px;display:flex}.btn{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:8px;padding:8px 16px;font-size:14px;font-weight:500;transition:background .15s,border-color .15s}.btn:hover:not(:disabled){background:var(--subtle);border-color:var(--border-strong)}.btn.icon{width:38px;padding:8px 0;font-size:16px;line-height:1}.btn:disabled{opacity:.4;cursor:default}.btn.subtle{color:var(--muted);border-color:#0000}.btn.subtle:hover:not(:disabled){color:var(--text)}.btn.small{padding:4px 10px;font-size:13px}.icon-btn{cursor:pointer;color:var(--muted);background:0 0;border:none;font-size:22px;line-height:1}.right-col{align-self:stretch;min-width:0;position:relative}.card{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);flex-direction:column;min-height:0;padding:16px;display:flex}.card-head{flex-shrink:0;justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.card-body{flex:1;min-height:0;margin-right:-8px;padding-right:8px;overflow-y:auto}.coach-card{position:absolute;inset:0}.ply-list{border-bottom:1px solid var(--border);flex-direction:column;gap:8px;margin-bottom:4px;padding-bottom:6px;display:flex}.card-head h3{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0;font-size:13px;font-weight:600}.muted{color:var(--muted)}.small{font-size:13px}.moves-strip{width:100%;max-width:var(--board-row);padding-left:28px}.move-list{white-space:nowrap;border:1px solid var(--border);border-radius:var(--radius);font-variant-numeric:tabular-nums;scrollbar-width:thin;align-items:center;gap:2px;min-height:42px;padding:5px 6px;display:flex;overflow:auto hidden}.move-pair{flex-shrink:0;align-items:center;display:flex}.move-pair+.move-pair{margin-left:6px}.move-num{color:var(--muted);padding:0 2px 0 4px;font-size:13px}.move-empty{margin:0 6px}.move{text-align:left;cursor:pointer;background:0 0;border:none;border-radius:6px;align-items:center;gap:6px;padding:5px 8px;font-size:14px;font-weight:500;display:flex}.move:hover{background:var(--hover)}.move.active{background:var(--text);color:var(--bg)}.move-tag{font-size:11px;font-weight:700}.move-tag.best{color:var(--best)}.move-tag.inaccuracy{color:var(--inaccuracy)}.move-tag.mistake{color:var(--mistake)}.move-tag.blunder{color:var(--blunder)}.move.active .move-tag{color:var(--bg)}.move-summary{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.move-title{font-size:16px;font-weight:600}.badge{color:#fff;border-radius:999px;padding:3px 8px;font-size:12px;font-weight:600}.badge.best{background:var(--best)}.badge.excellent{background:var(--excellent)}.badge.good{background:var(--good)}.badge.book{background:var(--book)}.badge.inaccuracy{background:var(--inaccuracy)}.badge.mistake{background:var(--mistake)}.badge.blunder{background:var(--blunder)}.facts{color:var(--muted);flex-wrap:wrap;gap:16px;margin:8px 0 4px;font-size:13px;display:flex}.facts b{color:var(--text);font-weight:600}.facts .best-move{color:var(--green)}.coach-text{font-size:14px;line-height:1.6}.coach-text p{margin:8px 0}.coach-text ul,.coach-text ol{margin:8px 0;padding-left:20px}.coach-text li{margin:3px 0}.coach-text h3,.coach-text h4{margin:12px 0 4px;font-size:14px}.coach-text.error{color:var(--blunder)}.typing{gap:4px;padding:10px 0;display:flex}.typing span{background:var(--muted);border-radius:50%;width:6px;height:6px;animation:1.2s ease-in-out infinite pulse}.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}@keyframes pulse{0%,to{opacity:.25}50%{opacity:1}}.suggestions{flex-wrap:wrap;gap:6px;margin-bottom:10px;display:flex}.chip{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:999px;padding:5px 11px;font-size:13px}.chip:hover{background:var(--subtle)}.thread{flex-direction:column;gap:12px;display:flex}.qa .q{background:var(--subtle);border-radius:8px;padding:8px 12px;font-size:14px;font-weight:600;display:inline-block}.ask{flex-shrink:0;gap:8px;margin-top:10px;display:flex}.ask input{border:1px solid var(--border);min-width:0;font:inherit;background:var(--surface);color:var(--text);border-radius:8px;outline:none;flex:1;padding:8px 12px;font-size:14px}.ask input:focus{border-color:var(--input-focus)}.modal-backdrop{background:var(--backdrop);z-index:10;place-items:center;padding:16px;display:grid;position:fixed;inset:0}.modal{background:var(--surface);width:100%;max-width:560px;max-height:90vh;box-shadow:var(--shadow);border-radius:14px;padding:22px;overflow-y:auto}.picker-row{align-items:center;gap:12px;margin:14px 0 4px;display:flex}.segmented{border:1px solid var(--border);background:var(--subtle);border-radius:8px;padding:2px;display:inline-flex}.segmented button{cursor:pointer;color:var(--muted);background:0 0;border:none;border-radius:6px;padding:6px 14px;font-size:14px}.segmented button.on{background:var(--surface);color:var(--text);box-shadow:0 1px 2px #0000001f}.modal-head{justify-content:space-between;align-items:center;display:flex}.modal-head h2{margin:0;font-size:18px}.bot-grid{grid-template-columns:1fr 1fr;gap:8px;margin-top:14px;display:grid}.bot-card{text-align:left;border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:10px;align-items:flex-start;gap:12px;padding:12px;display:flex}.bot-card:hover{background:var(--subtle)}.bot-card.current{border-color:var(--text)}.bot-avatar{background:var(--avatar-bot);color:#fff;border-radius:8px;flex-shrink:0;place-items:center;width:34px;height:34px;font-weight:600;display:grid}.bot-info{flex-direction:column;gap:2px;display:flex}.bot-name{font-size:14px;font-weight:600}.bot-rating{color:var(--muted);margin-left:4px;font-weight:500}.bot-desc{color:var(--muted);font-size:12px;line-height:1.4}@media (width<=1080px){:root{--board:min(960px, calc(100vh - 150px))}.layout{grid-template-columns:1fr}.right-col{height:560px}}@media (width<=760px){.layout{grid-template-columns:1fr;gap:20px;padding:16px}.bot-grid{grid-template-columns:1fr}}.section-title{text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:22px 0 6px;font-size:12px;font-weight:600}.setting-row{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:8px;justify-content:space-between;align-items:center;width:100%;padding:10px 12px;font-size:14px;display:flex}.setting-row:hover{background:var(--subtle)}.switch{background:var(--border-strong);border-radius:999px;flex-shrink:0;width:32px;height:18px;transition:background .15s;position:relative}.switch:after{content:"";background:#fff;border-radius:50%;width:14px;height:14px;transition:transform .15s;position:absolute;top:2px;left:2px;box-shadow:0 1px 2px #0003}.switch.on{background:var(--green)}.switch.on:after{transform:translate(14px)}.field{flex-direction:column;gap:6px;margin-top:16px;display:flex}.field-label{font-size:13px;font-weight:600}.field-hint{color:var(--muted);font-size:12px;line-height:1.45}.field-hint.warn{color:var(--mistake)}.field-hint code,.field-hint+code{background:var(--subtle);border-radius:4px;padding:1px 4px;font-size:11px}.field input,.field select,.field textarea{border:1px solid var(--border);font:inherit;background:var(--surface);color:var(--text);border-radius:8px;outline:none;padding:8px 10px;font-size:14px}.field textarea{resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--input-focus)}.field .segmented{align-self:flex-start}.test-result{background:var(--subtle);border-radius:8px;margin-top:16px;padding:10px 12px;font-size:13px;line-height:1.5}.test-result p{margin:0}.test-result.done{border-left:3px solid var(--green)}.test-result.error{border-left:3px solid var(--blunder)}.modal-actions{align-items:center;gap:8px;margin-top:20px;display:flex}.spacer{flex:1}.btn.primary{background:var(--text);color:var(--bg);border-color:var(--text)}.btn.primary:hover:not(:disabled){background:var(--text);opacity:.88}.card-head h3{white-space:nowrap}.move-list:after{content:"";flex:0 0 6px}.sq-ref{border-bottom:1px dotted var(--muted);cursor:default;border-radius:2px}.sq-ref:hover{background:#3278e626;border-bottom-color:#3278e6}.card-head.tabs{border-bottom:1px solid var(--border);justify-content:flex-start;gap:4px;margin:-4px -16px 12px;padding:0 12px}.tab{cursor:pointer;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:6px 6px 10px;font-size:13px;font-weight:600;position:relative}.tab+.tab{margin-left:10px}.tab:hover{color:var(--text)}.tab.on{color:var(--text);border-bottom-color:var(--text)}.tab-dot{background:var(--green);vertical-align:middle;border-radius:50%;width:6px;height:6px;margin-left:6px;animation:1s ease-in-out infinite pulse;display:inline-block}.review-btn{margin-top:12px}.tooltip{background:var(--text);max-width:300px;color:var(--bg);white-space:nowrap;pointer-events:none;z-index:50;border-radius:6px;padding:5px 8px;font-size:12px;font-weight:500;line-height:1.3;position:fixed;transform:translate(-50%,calc(-100% - 6px));box-shadow:0 4px 12px #00000026}.key{font:inherit;opacity:.55;border:1px solid;border-radius:3px;margin-left:6px;padding:0 4px;font-size:.7em;line-height:1.5}.login{place-items:center;min-height:100vh;padding:16px;display:grid}.login-card{background:var(--surface);border:1px solid var(--border);width:100%;max-width:320px;box-shadow:var(--shadow);border-radius:14px;flex-direction:column;gap:12px;padding:22px;display:flex}.login-card h2{margin:0 0 4px;font-size:18px}.login-card input{border:1px solid var(--border);font:inherit;background:var(--surface);color:var(--text);border-radius:8px;outline:none;padding:8px 12px;font-size:14px}.login-card input:focus{border-color:var(--input-focus)}