:root{--ground: #15171B;--surface: #1E2127;--surface-2: #22262D;--line: #2C313A;--text: #E8EAED;--text-2: #C5CBD3;--muted: #9AA3AE;--faint: #7F8894;--accent: #F2B544;--accent-ink: #1A1406;--accent-soft: #3A3220;--danger-bg: #3A1D20;--danger-line: #6B2B30;--danger-text: #FFD9DB;--danger-strong: #FF9EA2;--sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;--pieces: "Segoe UI Symbol", "DejaVu Sans", "Noto Sans Symbols 2", "Apple Symbols", serif;color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:var(--ground);color:var(--text);font-family:var(--sans);min-height:100vh}h2{margin:0;font-size:15px;font-weight:600}button,input,select,textarea{font:inherit;color:inherit}svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}.muted{color:var(--muted)}.small{font-size:13px}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 16px;padding:12px 32px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:700;letter-spacing:-.01em}.brand svg{width:28px;height:28px;stroke-width:1.8}.topbar-right{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.chip{padding:8px 14px;border-radius:999px;background:var(--surface-2);border:1px solid var(--line);font-size:14px;color:var(--text-2)}.btn{min-height:44px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;border:1px solid var(--line);background:var(--surface-2);color:var(--text);font-weight:500;font-size:15px;cursor:pointer}.btn:hover:not(:disabled){background:#2a2f37}.btn:disabled{color:#5e6672;cursor:not-allowed}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}.btn.primary:hover:not(:disabled){background:#ffc75e}.btn.primary:disabled{background:#3a3527;border-color:#3a3527;color:#8c8573}.btn.ghost{background:transparent;color:var(--text-2)}.btn.danger{color:var(--danger-strong);border-color:var(--danger-line);background:var(--surface)}.btn.danger:disabled{color:#5e6672;border-color:var(--line)}.icon-btn{flex:1;min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px;border:1px solid var(--line);background:var(--surface-2);color:var(--text-2);cursor:pointer}.icon-btn:disabled{color:#5e6672;cursor:default}.layout{display:flex;flex-wrap:wrap;gap:32px;padding:28px 32px 40px;max-width:1280px;margin:0 auto;align-items:flex-start}.play{flex:999 1 560px;min-width:0;display:flex;justify-content:center}.play-inner{width:100%;max-width:min(680px,calc(100vh - 230px));min-width:280px;display:flex;flex-direction:column;gap:12px}.panel{flex:1 1 340px;max-width:420px;min-width:0;display:flex;flex-direction:column;gap:16px}.player{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px}.player .who{display:flex;align-items:center;gap:12px;min-width:0}.avatar{width:40px;height:40px;border-radius:10px;background:#2a2f37;display:flex;align-items:center;justify-content:center;font-weight:700;flex:none;color:var(--text-2)}.avatar.you{background:var(--accent);color:var(--accent-ink)}.avatar svg{width:22px;height:22px;stroke-width:1.8}.player .name{font-weight:600;font-size:15px}.player .sub{font-size:13px;color:var(--muted);display:flex;gap:4px;align-items:center;flex-wrap:wrap}.player .caps{font-family:var(--pieces);letter-spacing:-.05em}.player .right{display:flex;align-items:center;gap:8px}.badge{padding:6px 12px;border-radius:999px;font-size:13px;font-weight:600;background:var(--accent);color:var(--accent-ink);white-space:nowrap}.badge.quiet{background:transparent;color:var(--muted);font-weight:400;padding:6px 0}.clock{font-family:var(--mono);font-size:20px;font-weight:600;padding:6px 12px;border-radius:8px;background:var(--surface-2);border:1px solid var(--line);color:var(--text-2);min-width:92px;text-align:center}.clock.running{background:#e8eaed;color:#15171b;border-color:#e8eaed}.clock.low{background:var(--danger-bg);border-color:var(--danger-line);color:var(--danger-text)}.status{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:10px;background:var(--surface);border:1px solid var(--line);font-size:14px;color:var(--text-2);min-height:44px}.status.check{background:var(--danger-bg);border-color:var(--danger-line);color:var(--danger-text)}.status.over{background:var(--accent-soft);border-color:#5c4a1e;color:#f7cf73}.status strong{font-weight:600}.status .link{margin-left:auto;background:none;border:0;color:var(--accent);text-decoration:underline;cursor:pointer;padding:4px;min-height:32px}.status .spinner{width:14px;height:14px;border-radius:50%;border:2px solid var(--line);border-top-color:var(--accent);animation:spin .8s linear infinite;flex:none}@keyframes spin{to{transform:rotate(360deg)}}.board-wrap{position:relative;width:100%;aspect-ratio:1 / 1;container-type:inline-size}.board{--light: #DCE3E8;--dark: #7E97A6;--last-l: #F1D88C;--last-d: #C9A94F;--sel-l: #A9CBE6;--sel-d: #5E8FB5;--ink: #15171B;width:100%;height:100%;display:flex;flex-direction:column;border-radius:6px;overflow:hidden;box-shadow:0 10px 40px #00000073;container-type:inline-size;touch-action:none;user-select:none;-webkit-user-select:none}.board.theme-green{--light: #EBECD0;--dark: #739552;--last-l: #F5F682;--last-d: #B9CA43;--sel-l: #BBD3E8;--sel-d: #6B9BBF}.board.theme-walnut{--light: #ECD7B6;--dark: #A8784F;--last-l: #F3DA8A;--last-d: #C99F4A;--sel-l: #B9D0E2;--sel-d: #6F93AE}.rank{flex:1 1 0;min-height:0;display:grid;grid-template-columns:repeat(8,minmax(0,1fr))}.sq{position:relative;border:0;padding:0;margin:0;display:flex;align-items:center;justify-content:center;cursor:default;-webkit-tap-highlight-color:transparent}.board.interactive .sq{cursor:pointer}.sq.light{background-color:var(--light)}.sq.dark{background-color:var(--dark)}.sq.light.last{background-color:var(--last-l)}.sq.dark.last{background-color:var(--last-d)}.sq.light.selected{background-color:var(--sel-l)}.sq.dark.selected{background-color:var(--sel-d)}.sq.check{background-image:radial-gradient(circle,#e5484df2,#e5484d99 35%,#e5484d00 72%)}.sq:before,.sq:after{content:none;position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:2;box-sizing:border-box}.sq.last:before{content:"";border:.45cqw solid var(--ink)}.sq.selected:after{content:"";border:1.1cqw solid var(--ink)}.sq.target:after{content:"";border:.55cqw dashed var(--ink)}.sq.target-capture:after{content:"";background:linear-gradient(135deg,var(--ink) 0 16%,transparent 16%),linear-gradient(225deg,var(--ink) 0 16%,transparent 16%),linear-gradient(315deg,var(--ink) 0 16%,transparent 16%),linear-gradient(45deg,var(--ink) 0 16%,transparent 16%)}.sq.hover{box-shadow:inset 0 0 0 .7cqw #fff,inset 0 0 0 1.2cqw var(--ink)}.sq:focus-visible{outline:.6cqw solid #FFFFFF;outline-offset:-.6cqw;box-shadow:inset 0 0 0 1.3cqw var(--ink);z-index:3}.piece{font-family:var(--pieces);font-size:9.6cqw;line-height:1;pointer-events:none;position:relative;z-index:1}.piece.white{color:#fff;text-shadow:0 0 1px #111,0 0 1px #111,0 1px 1px #111,0 2px 3px rgba(0,0,0,.35)}.piece.black{color:#1c1d21;text-shadow:0 1px 0 rgba(255,255,255,.35),0 2px 3px rgba(0,0,0,.3)}.piece.lifted{opacity:.3}.piece.ghost{position:fixed;left:0;top:0;display:flex;align-items:center;justify-content:center;z-index:1000;pointer-events:none;filter:drop-shadow(0 6px 8px rgba(0,0,0,.4))}.coord{position:absolute;font:700 1.9cqw var(--sans);pointer-events:none;color:var(--ink);z-index:1}.coord.rank-label{top:.4cqw;left:.7cqw}.coord.file-label{bottom:.3cqw;right:.8cqw}.promo-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#10121573;z-index:5;border-radius:6px}.promo{position:absolute;width:12.5%;display:flex;flex-direction:column;background:#f5f6f8;box-shadow:0 6px 24px #00000080}.promo button{aspect-ratio:1 / 1;border:0;background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;font-family:var(--pieces);line-height:1;padding:0;pointer-events:auto;font-size:9.6cqw;overflow:hidden}.promo button:hover,.promo button:focus-visible{background:#dce3e8}.controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.controls .btn{min-height:48px;background:var(--surface)}.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden}.card.pad{padding:16px;display:flex;flex-direction:column;gap:12px}.card-head{display:flex;align-items:baseline;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--line);gap:8px}.card-head .muted{font-size:13px}.moves{list-style:none;margin:0;padding:8px 0;height:260px;overflow-y:auto;font-family:var(--mono);font-size:14px}.moves li{display:grid;grid-template-columns:44px minmax(0,1fr) minmax(0,1fr);align-items:center;padding:0 8px}.moves .num{color:var(--faint);padding-left:8px}.moves button{text-align:left;min-height:34px;padding:0 10px;border:0;border-radius:6px;background:transparent;color:var(--text);cursor:pointer;font-family:var(--mono)}.moves button:hover{background:var(--surface-2)}.moves button.current{background:var(--accent-soft);color:var(--accent);font-weight:600}.moves .empty{grid-column:1 / -1;color:var(--muted);font-family:var(--sans);padding:8px;display:block}.nav{display:flex;gap:6px;padding:10px 12px;border-top:1px solid var(--line)}.row{display:flex;gap:8px;align-items:center}.row.wrap{flex-wrap:wrap}.row.wrap .btn{flex:1 1 140px;font-size:14px}.row.between{justify-content:space-between}#fen{flex:1;min-width:0;min-height:44px;padding:0 12px;border-radius:8px;border:1px solid var(--line);background:var(--ground);color:var(--text-2);font:13px var(--mono)}#btn-copy-fen{flex:none;width:44px}.facts{margin:4px 0 0;display:grid;grid-template-columns:minmax(0,1fr) auto;row-gap:6px;font-size:13px}.facts dt{color:var(--muted)}.facts dd{margin:0;font-family:var(--mono)}select{min-height:44px;padding:0 12px;border-radius:8px;border:1px solid var(--line);background:var(--ground);color:var(--text);font-size:14px}.check-row{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-2);min-height:44px;cursor:pointer}.check-row input{width:18px;height:18px;accent-color:var(--accent)}dialog{padding:0;border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--text);width:min(600px,calc(100vw - 32px));max-height:calc(100vh - 32px)}dialog::backdrop{background:#08090ba8}.dlg{padding:28px;display:flex;flex-direction:column;gap:18px}.dlg.narrow{max-width:440px}.dlg h2{font-size:22px;font-weight:700}.dlg p{margin:0}fieldset{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;min-width:0}legend{font-size:13px;color:var(--muted);font-weight:500;padding:0;margin-bottom:8px}.seg{display:grid;gap:8px}.seg.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.seg.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.seg.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.seg label{position:relative;cursor:pointer}.seg input{position:absolute;opacity:0;top:0;right:0;bottom:0;left:0;margin:0;cursor:pointer}.seg span{min-height:48px;height:100%;padding:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;text-align:center;border-radius:10px;border:1px solid var(--line);background:var(--surface-2);color:var(--text-2);font-weight:500;font-size:15px}.seg span small{font-size:12px;color:var(--muted);font-weight:400}.seg input:checked+span{border:2px solid var(--accent);background:#2e2717;color:#f7cf73;font-weight:600}.seg input:focus-visible+span{outline:2px solid var(--accent);outline-offset:2px}fieldset:disabled{opacity:.45}.dlg-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}.dlg-actions.between{justify-content:space-between}.dlg-actions.start{justify-content:flex-start}.tabs{display:flex;gap:4px;padding:4px;background:var(--ground);border-radius:10px;align-self:flex-start}.tabs button{min-height:40px;padding:0 18px;border-radius:8px;border:0;background:transparent;color:var(--muted);font-weight:500;font-size:14px;cursor:pointer}.tabs button[aria-selected=true]{background:#2a2f37;color:var(--text);font-weight:600}textarea{resize:vertical;width:100%;padding:12px;border-radius:8px;border:1px solid var(--line);background:var(--ground);color:var(--text-2);font:13px/1.55 var(--mono)}textarea.invalid{border-color:#a8434a}.alert{padding:10px 12px;border-radius:10px;background:var(--danger-bg);border:1px solid var(--danger-line);color:var(--danger-text);font-size:14px}.file-btn{position:relative;overflow:hidden}.file-btn input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.over-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.over-head h2{font-size:28px;margin:4px 0}.score{font-family:var(--mono);font-size:40px;font-weight:600;color:var(--accent);white-space:nowrap}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%);background:#e8eaed;color:#15171b;padding:12px 18px;border-radius:10px;font-size:14px;font-weight:500;box-shadow:0 8px 30px #00000080;z-index:50;max-width:calc(100vw - 32px)}@media(max-width:760px){.topbar{padding:8px 16px}.brand{font-size:17px}.chip{display:none}.layout{padding:8px 0 32px;gap:16px}.play-inner{max-width:none;min-width:0;gap:8px}.player,.status{margin:0 16px}.board{border-radius:0}.coord{font-size:2.6cqw}.panel{max-width:none;padding:0 16px}.controls{grid-template-columns:repeat(4,minmax(0,1fr))}.controls .btn{flex-direction:column;gap:2px;font-size:12px;padding:4px;min-height:56px}.moves{height:auto;max-height:180px}.seg.cols-4{grid-template-columns:repeat(2,minmax(0,1fr))}.dlg{padding:20px}}