:root{
  --bg:#EEF0F2; --panel:#FFFFFF; --ink:#1B2228; --muted:#5E6B75; --line:#D5DBE0;
  --accent:#E3B341; --accent-ink:#3A2A00; --danger:#C8432E;
  --shadow:0 1px 2px rgba(20,30,40,.12),0 8px 24px rgba(20,30,40,.10);
  --sq-light:#DEE3E6; --sq-dark:#8CA2AD; --coord-on-light:#8CA2AD; --coord-on-dark:#DEE3E6;
}
:root[data-board="brown"]{--sq-light:#F0D9B5;--sq-dark:#B58863;--coord-on-light:#B58863;--coord-on-dark:#F0D9B5}
:root[data-board="green"]{--sq-light:#EEEED2;--sq-dark:#769656;--coord-on-light:#769656;--coord-on-dark:#EEEED2}
:root[data-board="slate"]{--sq-light:#C9D3DB;--sq-dark:#5C7B8C;--coord-on-light:#5C7B8C;--coord-on-dark:#C9D3DB}
@media (prefers-color-scheme:dark){:root{
  --bg:#14191E; --panel:#1C2329; --ink:#E4E9ED; --muted:#98A5B0; --line:#2C3740;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35);
}}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 "IBM Plex Sans",system-ui,sans-serif;-webkit-text-size-adjust:100%}
a{color:inherit}
.wrap{max-width:1100px;margin:0 auto;padding-block:16px 32px;padding-inline:16px}
header{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px}
h1{font:700 30px/1.1 "Fraunces","Georgia",serif;margin:0;letter-spacing:-.01em}
h2{font:700 22px/1.2 "Fraunces","Georgia",serif;margin:0 0 14px}
.hdr-actions{display:flex;gap:8px}
.game{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}
@media (max-width:780px){.game{grid-template-columns:1fr}}
.boardwrap{display:flex;flex-direction:column;gap:10px}
.player{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 12px;border-radius:8px;background:var(--panel);border:1px solid var(--line);min-height:46px}
.player{opacity:.62;transition:opacity .15s,background .15s}
.player.active{opacity:1;background:color-mix(in srgb,var(--accent) 22%,var(--panel));border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 45%,transparent)}
.player .turn{font:600 12px "IBM Plex Sans",sans-serif;color:var(--accent-ink);background:var(--accent);border-radius:999px;padding:2px 9px;margin-left:4px;animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{opacity:.7}}
.player .name{font-weight:600;display:flex;align-items:center;gap:8px}
.player .tag{font:500 11px "IBM Plex Mono",monospace;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:1px 6px}
.dot{width:14px;height:14px;border-radius:50%;border:1px solid var(--line);display:inline-block}
.dot.w{background:#FAFAF7} .dot.b{background:#1A1A1C}
.captured{display:flex;align-items:center;min-height:22px}
.captured .cp{width:20px;height:20px;background-size:contain;background-repeat:no-repeat;margin-left:-6px}
.captured .cp:first-child{margin-left:0}
.captured .adv{font:500 12px "IBM Plex Mono",monospace;color:var(--muted);margin-left:6px}

.board-frame{position:relative;width:100%;max-width:640px;margin:0 auto}
.board{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);border-radius:6px;overflow:hidden;box-shadow:var(--shadow);user-select:none;-webkit-user-select:none;touch-action:manipulation}
.sq{position:relative;cursor:pointer;background:var(--sq-light)}
.sq.dark{background:var(--sq-dark)}
.sq .coord{position:absolute;font:500 10px "IBM Plex Mono",monospace;pointer-events:none;z-index:2}
.sq .file{right:3px;bottom:1px} .sq .rank{left:3px;top:1px}
.sq.dark .coord{color:var(--coord-on-dark)} .sq:not(.dark) .coord{color:var(--coord-on-light)}
:root[data-coords="0"] .sq .coord{display:none}
.sq.sel{background:color-mix(in srgb,var(--accent) 70%,var(--sq-light))}
.sq.sel.dark{background:color-mix(in srgb,var(--accent) 60%,var(--sq-dark))}
.sq.last::before{content:"";position:absolute;inset:0;background:color-mix(in srgb,var(--accent) 30%,transparent)}
.sq.hint::after{content:"";position:absolute;left:37%;top:37%;width:26%;height:26%;border-radius:50%;background:rgba(20,30,40,.25);z-index:1}
.sq.hint.cap::after{left:6%;top:6%;width:88%;height:88%;background:none;border:5px solid rgba(20,30,40,.25)}
:root[data-hints="0"] .sq.hint::after{display:none}
.sq.check{background:radial-gradient(circle,var(--danger) 0 35%,transparent 75%)}
.piece{position:absolute;inset:0;background-size:contain;background-repeat:no-repeat;background-position:center;z-index:1;will-change:transform}
.piece.anim{transition:transform .18s ease-out;z-index:3}
.piece.dragging{pointer-events:none;z-index:5}
.sq.drag-over{outline:3px solid var(--accent);outline-offset:-3px}

.thinking{position:absolute;left:50%;top:-8px;transform:translate(-50%,-100%);font:500 12px "IBM Plex Mono",monospace;color:var(--muted);display:flex;gap:6px;align-items:center}
.thinking[hidden]{display:none}
@media (prefers-reduced-motion:reduce){.player .turn{animation:none}}
.spinner{width:10px;height:10px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow)}
.status{font:700 20px/1.2 "Fraunces","Georgia",serif;text-wrap:balance;min-height:52px}
.status small{display:block;font:400 13px/1.4 "IBM Plex Sans",sans-serif;color:var(--muted);margin-top:4px}
.status.over{color:var(--danger)} .status.draw{color:var(--muted)}
.moves{font:14px/1.7 "IBM Plex Mono",monospace;max-height:300px;overflow-y:auto;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-block:6px;display:grid;grid-template-columns:2.6em 1fr 1fr;column-gap:8px;font-variant-numeric:tabular-nums;align-content:start}
.moves .n{color:var(--muted)} .moves span{padding-inline:4px;border-radius:4px}
.moves .cur{background:color-mix(in srgb,var(--accent) 35%,transparent)}
.moves .empty{grid-column:1/-1;color:var(--muted);font-family:"IBM Plex Sans",sans-serif}
.btns{display:flex;gap:8px;flex-wrap:wrap}
.btns.end{justify-content:flex-end;margin-top:18px}
button{font:600 14px "IBM Plex Sans",sans-serif;padding:9px 14px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--ink);cursor:pointer}
button:hover{border-color:var(--ink)} button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
button.ghost{background:transparent}
button:disabled{opacity:.45;cursor:default}
.eyebrow{font:600 11px "IBM Plex Sans",sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0}
.lbl{font-weight:600;margin:14px 0 8px;display:block}
.lbl:first-of-type{margin-top:0}
.fine{margin:0;color:var(--muted);font-size:13px}
footer{margin-top:28px;color:var(--muted);font-size:12px;line-height:1.5;max-width:70ch}

.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(10,14,18,.55);z-index:10;padding:16px}
.modal[hidden]{display:none}
.modal .box{background:var(--panel);border-radius:12px;padding:22px;box-shadow:var(--shadow);max-width:100%;width:auto}
.modal .box.wide{width:420px}
.promo{display:flex;gap:8px;justify-content:center}
.promo button{width:64px;height:64px;padding:6px;background-size:contain;background-repeat:no-repeat;background-position:center;background-origin:content-box}
.seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg-btn{flex:1;border:0;border-radius:0;background:transparent;padding:9px 6px}
.seg-btn+.seg-btn{border-left:1px solid var(--line)}
.seg-btn.active{background:var(--accent);color:var(--accent-ink)}
input[type=range]{width:100%;accent-color:var(--accent);margin:6px 0 0}
.levels{display:flex;justify-content:space-between;font:11px "IBM Plex Mono",monospace;color:var(--muted);padding-inline:4px;margin-bottom:6px}
.swatches{display:flex;gap:10px}
.swatch{width:44px;height:44px;padding:0;border-radius:6px;background:linear-gradient(135deg,var(--a) 50%,var(--b) 50%)}
.swatch[data-board="blue"]{--a:#DEE3E6;--b:#8CA2AD}
.swatch[data-board="brown"]{--a:#F0D9B5;--b:#B58863}
.swatch[data-board="green"]{--a:#EEEED2;--b:#769656}
.swatch[data-board="slate"]{--a:#C9D3DB;--b:#5C7B8C}
.swatch.active{outline:3px solid var(--accent);outline-offset:2px}
.check{display:flex;align-items:center;gap:8px;margin-top:12px;cursor:pointer}
.check input{accent-color:var(--accent);width:16px;height:16px}
@media (prefers-reduced-motion:reduce){.piece.anim{transition:none}.spinner{animation:none}}