@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";
*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0d1117;--surface-1:#161b2e;--surface-2:#1e2640;--sq-dark:#1e3050;--sq-light:#2c3e5c;--sq-selected:#1a4a8a;--sq-valid:#163a7a;--sq-last:#1a3d70;--accent:#3b82f6;--accent-h:#60a5fa;--accent-glow:#3b82f666;--text:#f1f5f9;--text-muted:#94a3b8;--border:#ffffff12;--radius:10px;--board-size:min(520px, 90vw)}html,body{background-color:var(--bg);height:100%;color:var(--text);-webkit-font-smoothing:antialiased;font-family:Inter,sans-serif}.game-root{flex-direction:column;align-items:center;gap:2rem;min-height:100vh;padding:2rem 1rem 3rem;display:flex}.site-header{text-align:center}.site-header h1{letter-spacing:-.02em;font-size:clamp(2rem,5vw,3.5rem);font-weight:800;line-height:1.1}.title-white{color:#f1f5f9}.title-blue{color:var(--accent-h);background:linear-gradient(135deg,#60a5fa,#818cf8);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.subtitle{color:var(--text-muted);margin-top:.4rem;font-size:1rem;font-weight:400}.game-layout{flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:1.5rem;width:100%;max-width:1100px;display:flex}.board-wrapper{flex-shrink:0;align-items:flex-start;gap:4px;display:flex}.board-labels-left{height:var(--board-size);flex-direction:column;justify-content:space-around;padding-bottom:1.5rem;display:flex}.board-labels-bottom{width:var(--board-size);justify-content:space-around;padding-top:4px;display:flex}.board-label{color:var(--text-muted);text-align:center;width:1rem;font-size:.7rem;font-weight:500;line-height:1}.board-grid{width:var(--board-size);height:var(--board-size);border:2px solid #3b82f640;border-radius:6px;grid-template-rows:repeat(8,1fr);grid-template-columns:repeat(8,1fr);display:grid;overflow:hidden;box-shadow:0 0 0 1px #ffffff0d,0 25px 60px #0009,0 0 40px #3b82f614}.board-square{cursor:pointer;justify-content:center;align-items:center;transition:background-color .1s;display:flex;position:relative}.sq-light{background:var(--sq-light)}.sq-dark{background:var(--sq-dark)}.sq-dark:hover{background:#253a5c}.sq-selected{background:var(--sq-selected)!important}.sq-valid{background:#1a3f7e!important}.sq-last-from{background:#1a3d60!important}.sq-last-to{background:#1c4272!important}.move-dot{pointer-events:none;background:#60a5faa6;border-radius:50%;width:28%;height:28%;animation:1.5s ease-in-out infinite pulse-dot;box-shadow:0 0 10px #60a5fa80}.capture-ring{pointer-events:none;border:3px solid #60a5fab3;border-radius:50%;animation:1.5s ease-in-out infinite pulse-ring;position:absolute;inset:4px;box-shadow:0 0 10px #60a5fa66}@keyframes pulse-dot{0%,to{opacity:.7;transform:scale(1)}50%{opacity:1;transform:scale(1.15)}}@keyframes pulse-ring{0%,to{opacity:.5}50%{opacity:.9}}.checker-piece{cursor:pointer;z-index:1;width:82%;height:82%;position:relative}.side-panel{background:var(--surface-1);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:0;min-width:260px;max-width:300px;display:flex;overflow:hidden;box-shadow:0 20px 50px #0006}.panel-section{border-bottom:1px solid var(--border);padding:1.2rem 1.4rem}.panel-section:last-child{border-bottom:none}.panel-heading{letter-spacing:.1em;color:var(--text-muted);text-transform:uppercase;margin-bottom:.75rem;font-size:.7rem;font-weight:700}.status-text{color:var(--text);font-size:1rem;font-weight:600;transition:color .3s}.status-win{color:#4ade80!important}.status-lose{color:#f87171!important}.score-grid{grid-template-columns:1fr 1fr;gap:.6rem;margin-bottom:.75rem;display:grid}.score-card{background:var(--surface-2);text-align:center;border:1px solid var(--border);border-radius:8px;padding:.75rem .5rem}.score-label{color:var(--text-muted);margin-bottom:4px;font-size:.7rem}.score-count{font-size:2rem;font-weight:800;line-height:1}.score-sub{color:var(--text-muted);margin-top:2px;font-size:.65rem}.score-player .score-count{color:#f87171}.score-ai .score-count{color:#94a3b8}.captured-row{color:var(--text-muted);justify-content:space-between;font-size:.75rem;display:flex}.captured-row strong{color:var(--text)}.setting-label{color:var(--text-muted);margin-bottom:.5rem;font-size:.8rem;display:block}.setting-select{background:var(--surface-2);width:100%;color:var(--text);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-position:right .75rem center;background-repeat:no-repeat;border:1px solid #ffffff1f;border-radius:6px;padding:.55rem 2rem .55rem .75rem;font-family:inherit;font-size:.875rem;transition:border-color .2s}.setting-select:focus{border-color:var(--accent);outline:none}.setting-select:disabled{opacity:.5;cursor:not-allowed}.btn{cursor:pointer;border:none;border-radius:7px;width:100%;padding:.7rem 1rem;font-family:inherit;font-size:.9rem;font-weight:600;transition:transform .15s,box-shadow .15s,filter .15s}.btn:hover{filter:brightness(1.12);transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn-primary{color:#fff;background:linear-gradient(135deg,#3b82f6,#6366f1);box-shadow:0 4px 15px #3b82f64d}.btn-primary:hover{box-shadow:0 6px 20px #3b82f680}.rules-section{background:#0000001a}.rules-list{flex-direction:column;gap:.45rem;list-style:none;display:flex}.rules-list li{color:var(--text-muted);padding-left:1rem;font-size:.78rem;position:relative}.rules-list li:before{content:"•";color:var(--accent-h);position:absolute;left:0}@media (max-width:640px){:root{--board-size:min(340px, 94vw)}.site-header h1{font-size:2rem}.side-panel{width:100%;min-width:auto;max-width:100%}}