:root{--bg:#10151d;--panel:#1a222e;--panel2:#222d3b;--ink:#f4f7fb;--muted:#aeb9c8;--accent:#42b85a;--accent2:#e0a43b;--danger:#e45b54;--line:#344153;--shadow:0 22px 65px #0008}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(circle at 50% 0,#29384c 0,#111721 42%,#090d13 100%);color:var(--ink);font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif}button,input{font:inherit}.board-app{min-height:100vh;display:grid;grid-template-rows:auto 1fr}.board-top{display:flex;align-items:center;justify-content:space-between;padding:12px 18px;background:#0b1018dd;border-bottom:1px solid #ffffff12;backdrop-filter:blur(14px);position:sticky;top:0;z-index:20}.board-brand{display:flex;align-items:center;gap:11px}.board-brand i{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;background:linear-gradient(145deg,var(--accent),#187c36);font-size:22px;box-shadow:inset 0 1px #fff4}.board-brand strong{display:block;font-size:16px}.board-brand small{display:block;color:var(--muted);font-size:11px}.top-status{font-size:13px;color:var(--muted);display:flex;gap:8px;align-items:center}.top-status b{color:var(--ink)}
.board-stage{width:min(1500px,100%);margin:auto;padding:18px;display:grid;grid-template-columns:minmax(420px,780px) minmax(300px,420px);gap:18px;align-items:start}.board-column,.side-column{min-width:0}.game-card{background:linear-gradient(145deg,#212b39,#151c26);border:1px solid #ffffff15;border-radius:20px;box-shadow:var(--shadow);overflow:hidden}.game-card-head{display:flex;justify-content:space-between;align-items:center;padding:14px 17px;border-bottom:1px solid var(--line)}.game-card-head h1{margin:0;font-size:clamp(20px,3vw,30px)}.turn-pill{border:1px solid #ffffff25;background:#0e141d;padding:8px 13px;border-radius:999px;font-weight:800;font-size:13px}.board-wrap{padding:16px;display:grid;place-items:center}.board{width:min(76vh,100%);aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);border:9px solid #604022;border-radius:8px;box-shadow:0 18px 35px #0009,inset 0 0 0 2px #f2d196;overflow:hidden;user-select:none;touch-action:manipulation}.square{position:relative;border:0;padding:0;display:grid;place-items:center;cursor:pointer}.square.light{background:#e7d2ae}.square.dark{background:#8b5d36}.square::after{content:"";position:absolute;inset:7%;border-radius:10px;pointer-events:none}.square.selected::after{border:4px solid #ffe16b;box-shadow:0 0 18px #ffe16b}.square.legal::after{background:#43c85b9e;inset:32%;border-radius:50%}.square.capture::after{border:5px solid #f76555;background:#f7655533;inset:13%;border-radius:50%}.square.last::before{content:"";position:absolute;inset:0;background:#ffdd4842}.coord{position:absolute;font:700 10px ui-monospace,monospace;opacity:.65}.coord.file{right:3px;bottom:2px}.coord.rank{left:3px;top:2px}.piece{position:relative;z-index:2;display:grid;place-items:center;width:88%;height:88%;filter:drop-shadow(0 5px 3px #0007);transition:transform .13s ease}.square:hover .piece{transform:translateY(-2px)}
.chess-piece{font-family:"Segoe UI Symbol","Noto Sans Symbols 2",serif;font-size:clamp(33px,7.2vw,76px);line-height:1;text-shadow:0 2px 0 #0004}.chess-piece.white{color:#fff8df;-webkit-text-stroke:1px #5b4329}.chess-piece.black{color:#20252b;-webkit-text-stroke:1px #c5a574}.checker{width:72%;height:72%;border-radius:50%;border:4px solid #0006;box-shadow:inset 0 7px 0 #ffffff38,inset 0 -9px 0 #0003,0 5px 7px #0006}.checker.red{background:linear-gradient(#ef604e,#aa201b)}.checker.black{background:linear-gradient(#394454,#111720)}.checker.king::after{content:"♛";font-size:clamp(20px,4vw,38px);color:#ffd96a;text-shadow:0 2px #000;display:grid;place-items:center;height:100%}
.board-footer{display:flex;justify-content:space-between;gap:10px;padding:0 16px 16px;color:var(--muted);font-size:13px}.board-footer strong{color:var(--ink)}
.panel{background:linear-gradient(145deg,#202a37,#151c25);border:1px solid #ffffff14;border-radius:18px;box-shadow:0 15px 45px #0005;margin-bottom:14px;overflow:hidden}.panel h2{font-size:15px;margin:0;padding:13px 15px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.panel-body{padding:14px}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mode-button{min-height:88px;border:1px solid #ffffff17;border-radius:13px;background:#283444;color:var(--ink);padding:12px;cursor:pointer;text-align:left;transition:.18s}.mode-button:hover{transform:translateY(-2px);background:#324154}.mode-button strong{display:block;margin-bottom:5px}.mode-button small{color:var(--muted);line-height:1.35}.button{border:0;border-radius:10px;padding:11px 14px;background:linear-gradient(#4fc968,#299b43);color:white;font-weight:800;cursor:pointer;box-shadow:0 5px 14px #13802c44}.button.secondary{background:#2a3544;box-shadow:none;border:1px solid #ffffff20}.button.danger{background:#a93632}.button:disabled{opacity:.5;cursor:not-allowed}.form-row{display:flex;gap:8px}.form-row input,.chat-form input,.field{min-width:0;flex:1;border:1px solid #435267;border-radius:10px;background:#0e151f;color:#fff;padding:11px 12px;outline:none}.form-row input:focus,.chat-form input:focus,.field:focus{border-color:var(--accent)}.room-box{display:grid;gap:10px}.room-code{font:900 30px ui-monospace,monospace;letter-spacing:5px;text-align:center;background:#0d131b;border:1px dashed #66758a;border-radius:12px;padding:12px;color:#ffe07a}.players{display:grid;grid-template-columns:1fr 1fr;gap:8px}.player-card{background:#101721;border-radius:10px;padding:10px}.player-card small{color:var(--muted);display:block}.player-card strong{font-size:13px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;text-align:center}.stats-grid div{background:#101721;border-radius:10px;padding:9px}.stats-grid strong{display:block;font-size:19px}.stats-grid small{color:var(--muted)}
.chat-log{height:230px;overflow:auto;padding:11px;display:flex;flex-direction:column;gap:8px;background:#0c121a}.chat-message{max-width:91%;border-radius:12px;padding:8px 10px;background:#263344;font-size:13px;line-height:1.35}.chat-message.mine{align-self:flex-end;background:#1d6d37}.chat-message.ai{background:#4a3420;border:1px solid #e6a94455}.chat-message small{display:block;color:#bfc9d6;margin-bottom:3px}.chat-form{display:flex;gap:7px;padding:10px;border-top:1px solid var(--line)}.chat-form button{padding:9px 13px}.chat-note{font-size:11px;color:var(--muted);padding:0 11px 10px}.thinking{display:inline-flex;gap:4px;align-items:center}.thinking i{width:6px;height:6px;border-radius:50%;background:#f1c45a;animation:dot 1s infinite}.thinking i:nth-child(2){animation-delay:.15s}.thinking i:nth-child(3){animation-delay:.3s}@keyframes dot{50%{transform:translateY(-4px)}}
.toast{position:fixed;left:50%;bottom:20px;transform:translate(-50%,20px);background:#05080d;color:#fff;border:1px solid #ffffff2c;border-radius:12px;padding:12px 16px;box-shadow:0 14px 40px #000b;opacity:0;pointer-events:none;transition:.2s;z-index:50;max-width:min(90vw,520px)}.toast.show{opacity:1;transform:translate(-50%,0)}.overlay{position:fixed;inset:0;background:#080c12e8;display:grid;place-items:center;padding:18px;z-index:40}.overlay.hidden{display:none}.dialog{width:min(520px,100%);background:#1c2633;border:1px solid #ffffff22;border-radius:20px;padding:22px;box-shadow:var(--shadow)}.dialog h2{margin-top:0}.dialog p{color:var(--muted);line-height:1.5}.dialog-actions{display:flex;gap:9px;flex-wrap:wrap}.result-title{font-size:34px;margin:0 0 8px}.hidden{display:none!important}
@media(max-width:950px){.board-stage{grid-template-columns:1fr;padding:10px}.side-column{display:grid;grid-template-columns:1fr 1fr;gap:10px}.side-column .panel{margin:0}.board{width:min(92vw,72vh)}}
@media(max-width:650px){.board-top{padding:9px 11px}.top-status{display:none}.board-stage{padding:7px;gap:8px}.game-card{border-radius:12px}.game-card-head{padding:10px}.board-wrap{padding:7px}.board{border-width:5px;width:min(96vw,68vh)}.board-footer{padding:0 9px 9px;font-size:11px}.side-column{grid-template-columns:1fr}.panel{border-radius:12px}.chess-piece{font-size:clamp(29px,11vw,58px)}.mode-grid{grid-template-columns:1fr 1fr}.chat-log{height:180px}}