*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
    --bg:#2c2520;
    --text:#fff;
    --header-bg:#f5f5f5;
    --header-border:#ccc;
    --header-text:#222;
    --board-light:#f0d9b5;
    --board-dark:#b58863;
    --board-border:#3e2c1c;
    --label-on-light:#7a5230;
    --label-on-dark:#f0d9b5;
    --piece-white:#fafafa;
    --piece-black:#1a1a1a;
    --selected-bg:rgba(255,235,59,0.55);
    --last-move-bg:rgba(255,236,79,0.4);
    --move-dot:rgba(20,20,20,0.35);
    --move-capture-ring:rgba(220,40,40,0.65);
    --check-bg:#ff6b6b;
    --accent:#4a90d9;
    --modal-bg:#fff;
    --modal-text:#222;
    --overlay-bg:rgba(0,0,0,0.55);
    --panel-bg:rgba(0,0,0,0.3);
    --thinking-bg:rgba(0,0,0,0.55);
}
[data-theme="dark"]{
    --bg:#1a1a2e;
    --text:#e0e0e0;
    --header-bg:#16213e;
    --header-border:#0f3460;
    --header-text:#e0e0e0;
    --board-light:#d6c39a;
    --board-dark:#7a5230;
    --board-border:#1f1209;
    --label-on-light:#5a3d20;
    --label-on-dark:#e8d6a5;
    --piece-white:#f5f5f5;
    --piece-black:#111;
    --selected-bg:rgba(255,213,79,0.55);
    --last-move-bg:rgba(255,213,79,0.4);
    --modal-bg:#16213e;
    --modal-text:#e0e0e0;
    --overlay-bg:rgba(0,0,0,0.65);
    --panel-bg:rgba(0,0,0,0.4);
}
html,body{height:100%;font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);-webkit-user-select:none;user-select:none;overflow:hidden}
body{display:flex;justify-content:center}
.app{width:100%;max-width:640px;display:flex;flex-direction:column;height:100%}
.app-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:var(--header-bg);border-bottom:1px solid var(--header-border);color:var(--header-text);flex-shrink:0}
.app-title{font-size:1.15rem;font-weight:700}
.icon-btn{background:none;border:none;cursor:pointer;color:var(--header-text);padding:6px;border-radius:8px;display:flex;align-items:center;justify-content:center;width:36px;height:36px}
.icon-btn:hover{background:rgba(128,128,128,0.15)}
.icon-btn svg{width:20px;height:20px}
[data-theme="light"] .icon-moon{display:none}
[data-theme="dark"] .icon-sun{display:none}
[data-theme="dark"] .icon-moon{display:block}

.game-container{flex:1;display:flex;flex-direction:column;align-items:center;padding:8px;gap:6px;overflow:hidden;min-height:0}

.status-bar{display:flex;justify-content:space-between;align-items:center;width:100%;max-width:480px;font-size:.8rem;font-weight:600;padding:5px 12px;background:var(--panel-bg);border-radius:8px;gap:8px;flex-shrink:0}
.turn-indicator{display:flex;align-items:center;gap:8px}
.turn-dot{width:11px;height:11px;border-radius:50%;background:#f5f5f5;border:1.5px solid #444;transition:all .15s}
.turn-indicator.black .turn-dot{background:#1a1a1a;border-color:#000}
.game-status{font-size:.72rem;color:#ffb74d;font-weight:700}
.game-status.check{color:#ef5350}

.captured{min-height:22px;width:100%;max-width:480px;font-size:1.15rem;letter-spacing:1px;line-height:1;display:flex;align-items:center;justify-content:flex-start;padding:0 4px;flex-wrap:wrap;color:#ccc;flex-shrink:0}
.captured .score{margin-left:auto;font-size:.7rem;font-weight:700;color:#a5d6a7;letter-spacing:0;font-family:'Inter',sans-serif}
.captured .score.neg{color:#ef9a9a}

.board-wrap{width:100%;max-width:480px;aspect-ratio:1;position:relative;flex-shrink:0}
.board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:100%;height:100%;border:3px solid var(--board-border);border-radius:4px;overflow:hidden;box-shadow:0 6px 20px rgba(0,0,0,0.45)}
.sq{display:flex;align-items:center;justify-content:center;position:relative;cursor:default;font-size:clamp(1.6rem,7vw,2.7rem);line-height:1;-webkit-tap-highlight-color:transparent}
.sq.light{background:var(--board-light)}
.sq.dark{background:var(--board-dark)}
.sq.selected{background:var(--selected-bg)!important;background-blend-mode:multiply}
.sq.last-move{box-shadow:inset 0 0 0 1000px var(--last-move-bg)}
.sq.in-check{box-shadow:inset 0 0 0 1000px rgba(255,80,80,0.55)}
.sq.can-move{cursor:pointer}
.sq .move-marker{position:absolute;inset:0;pointer-events:none;display:flex;align-items:center;justify-content:center}
.sq .move-marker::before{content:'';display:block;width:30%;height:30%;border-radius:50%;background:var(--move-dot)}
.sq.capture .move-marker::before{width:100%;height:100%;background:transparent;border:4px solid var(--move-capture-ring);box-sizing:border-box;border-radius:50%;transform:scale(0.85)}
.sq .coord{position:absolute;font-size:.55rem;font-weight:700;font-family:'Inter',sans-serif;pointer-events:none;opacity:.85}
.sq .coord.file{bottom:1px;right:3px}
.sq .coord.rank{top:1px;left:3px}
.sq.light .coord{color:var(--label-on-light)}
.sq.dark .coord{color:var(--label-on-dark)}

.piece{font-size:1em;line-height:1;cursor:pointer;user-select:none;position:relative;z-index:1;transition:transform .1s}
.piece.w{color:var(--piece-white);text-shadow:0 0 1px #000,0 0 2px #000,1px 1px 0 #333,-1px -1px 0 #333,0 2px 3px rgba(0,0,0,0.4)}
.piece.b{color:var(--piece-black);text-shadow:0 0 1px rgba(255,255,255,0.3),0 1px 2px rgba(0,0,0,0.5)}
.piece.draggable:hover{transform:translateY(-2px) scale(1.06)}

.thinking{position:absolute;bottom:8px;right:8px;background:var(--thinking-bg);color:#fff;font-size:.7rem;font-weight:600;padding:4px 10px;border-radius:6px;display:none;pointer-events:none}
.thinking.active{display:block}

.history-wrap{width:100%;max-width:480px;height:80px;overflow-y:auto;background:var(--panel-bg);border-radius:6px;padding:4px 8px;font-size:.72rem;flex-shrink:0}
.history{display:grid;grid-template-columns:auto 1fr 1fr;gap:1px 8px;align-items:start}
.history .move-num{opacity:.5;text-align:right;font-weight:600;padding:1px 0}
.history .move{padding:1px 4px;border-radius:3px;font-family:'Inter',sans-serif;font-variant-numeric:tabular-nums}
.history .move.last{background:rgba(255,255,255,0.2);font-weight:700}
.history-empty{opacity:.5;text-align:center;padding:6px;grid-column:1/-1}

.controls{display:flex;gap:6px;align-items:center;flex-wrap:wrap;justify-content:center;flex-shrink:0;padding-bottom:4px}
.action-btn{padding:8px 16px;font-family:inherit;font-size:.8rem;font-weight:600;border:none;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}
.action-btn:hover{filter:brightness(1.08)}
.action-btn.secondary{background:rgba(255,255,255,0.15);color:var(--text)}
.action-btn.secondary:hover{background:rgba(255,255,255,0.25)}
.action-btn:disabled{opacity:0.4;cursor:not-allowed}
.select{padding:8px 10px;font-family:inherit;font-size:.78rem;font-weight:600;border:none;border-radius:8px;background:rgba(255,255,255,0.15);color:var(--text);cursor:pointer;outline:none}
.select option{background:#222;color:#fff}

.modal-overlay{position:fixed;inset:0;background:var(--overlay-bg);display:none;align-items:center;justify-content:center;z-index:100;padding:20px}
.modal-overlay.active{display:flex}
.modal{background:var(--modal-bg);color:var(--modal-text);border-radius:16px;padding:24px;text-align:center;max-width:340px;width:100%;box-shadow:0 12px 40px rgba(0,0,0,0.3)}
.win-icon{font-size:48px;margin-bottom:6px}
.modal-title{font-size:1.15rem;font-weight:700;margin-bottom:6px}
.modal-sub{font-size:.85rem;opacity:.7;margin-bottom:14px}
.play-again-btn{width:100%;padding:12px;font-family:inherit;font-size:.9rem;font-weight:600;border:none;border-radius:10px;background:var(--accent);color:#fff;cursor:pointer}

.promote-choices{display:flex;justify-content:center;gap:8px;margin-top:6px}
.promote-piece{font-size:2.6rem;line-height:1;padding:8px;background:rgba(0,0,0,0.05);border-radius:10px;cursor:pointer;width:60px;height:60px;display:flex;align-items:center;justify-content:center;transition:all .15s;border:2px solid transparent}
[data-theme="dark"] .promote-piece{background:rgba(255,255,255,0.08)}
.promote-piece:hover{background:rgba(74,144,217,0.2);border-color:var(--accent);transform:translateY(-2px)}
.promote-piece.w{color:var(--piece-white);text-shadow:0 0 1px #000,0 0 2px #000,1px 1px 0 #333,-1px -1px 0 #333}
.promote-piece.b{color:var(--piece-black)}

/* ---- Online multiplayer additions ---- */

.player-list{display:flex;gap:6px;flex-wrap:wrap;width:100%;max-width:480px;font-size:.72rem}
.player-tag{display:flex;align-items:center;gap:6px;padding:3px 8px;border-radius:999px;background:rgba(0,0,0,0.3)}
.player-tag.me{outline:1.5px solid var(--accent)}
.player-dot{width:9px;height:9px;border-radius:50%;background:#666;flex-shrink:0}
.player-dot.online{background:#4caf50;box-shadow:0 0 0 2px rgba(76,175,80,0.25)}
.player-tag .name{font-weight:600}
.player-tag .role{opacity:.7;font-size:.65rem;text-transform:uppercase;letter-spacing:.5px}
.player-tag .waiting{font-size:.65rem;opacity:.7;font-style:italic}

.mp-form{display:flex;flex-direction:column;gap:8px;margin:8px 0}
.mp-input{padding:10px 12px;font-family:inherit;font-size:.9rem;border:1px solid rgba(0,0,0,0.15);border-radius:8px;background:rgba(0,0,0,0.03);color:var(--modal-text);width:100%;outline:none}
[data-theme="dark"] .mp-input{background:rgba(255,255,255,0.06);border-color:rgba(255,255,255,0.1)}
.mp-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(74,144,217,0.15)}

.mp-section-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;opacity:.65;text-align:left;margin-top:4px;margin-bottom:6px}

.mp-color-options{display:flex;gap:8px;margin-bottom:12px}
.mp-color-btn{flex:1;padding:12px 8px;font-family:inherit;font-size:.85rem;font-weight:600;border:2px solid rgba(0,0,0,0.1);border-radius:10px;background:rgba(0,0,0,0.03);color:var(--modal-text);cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px;transition:all .15s}
[data-theme="dark"] .mp-color-btn{background:rgba(255,255,255,0.06);border-color:rgba(255,255,255,0.1)}
.mp-color-btn .piece{font-size:1.6rem;line-height:1}
.mp-color-btn:hover{border-color:var(--accent);background:rgba(74,144,217,0.1);transform:translateY(-2px)}

.mp-share-group{display:flex;gap:6px;margin-top:8px}
.mp-share-input{flex:1;font-size:.78rem;font-family:'Menlo','Consolas',monospace}
.mp-copy-btn{padding:10px 14px;font-family:inherit;font-size:.8rem;font-weight:600;border:none;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer;white-space:nowrap}
.mp-copy-btn.copied{background:#4caf50}
.mp-share-hint{font-size:.75rem;opacity:.7;margin-top:8px;text-align:center}

.modal-cancel{margin-top:12px;padding:8px 16px;font-family:inherit;font-size:.8rem;font-weight:600;border:none;border-radius:8px;background:transparent;color:var(--modal-text);cursor:pointer;opacity:.6}
.modal-cancel:hover{opacity:1}

.toast-container{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;gap:6px;z-index:200;pointer-events:none}
.toast{background:rgba(0,0,0,0.85);color:#fff;font-size:.78rem;font-weight:600;padding:8px 14px;border-radius:8px;border-left:4px solid var(--accent);opacity:0;transform:translateY(8px);transition:opacity .25s,transform .25s;box-shadow:0 4px 16px rgba(0,0,0,0.3)}
.toast.visible{opacity:1;transform:translateY(0)}

@media (max-width:520px){
    .game-container{padding:6px;gap:4px}
    .history-wrap{height:60px}
    .controls{gap:4px}
    .action-btn,.select{padding:7px 12px;font-size:.75rem}
    .player-list{font-size:.66rem}
    .mp-color-btn{font-size:.78rem}
}