:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color:#ffffffde;background-color:#242424}html,body,#root{width:100vw;height:100vh;margin:0;padding:0;overflow:hidden;box-sizing:border-box}.app-header{text-align:center;margin-top:1.5rem;position:relative}.app-header h1{margin:0}.new-game-button{position:absolute;left:1rem;top:0;padding:.5rem 1rem;background:#667eea;color:#fff;border:none;border-radius:5px;cursor:pointer;font-weight:700}.new-game-button:hover{background:#5568d3}.game-info{font-size:.9rem;color:#666;margin-top:.5rem}.piece{display:block;width:90%;height:90%;font-size:6.5vmin;line-height:1;text-align:center;vertical-align:middle;-webkit-user-select:none;user-select:none}.white-piece{color:#fff;text-shadow:1px 1px 2px #000,0 0 2px #000,0 0 1px #000}.black-piece{color:#111;text-shadow:1px 1px 2px #fff,0 0 2px #fff,0 0 1px #fff}.chessboard-container{display:flex;flex-direction:column;justify-content:flex-start;align-items:center;width:100vw;height:100vh;margin:0;padding:2px;box-sizing:border-box;overflow:auto;gap:2px}.controls-row{display:flex;justify-content:center;align-items:center;gap:.5rem;margin-bottom:2px;flex-wrap:wrap}.checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer;font-size:.95rem;font-weight:500}.checkbox-label input[type=checkbox]{width:16px;height:16px;cursor:pointer}.scores-row{display:flex;justify-content:space-between;align-items:center;width:100%;max-width:550px;margin-bottom:2px;gap:.5rem}.player-info{text-align:center;flex:1}.score-display{font-size:1.1rem;font-weight:600;color:#f0d9b5;padding:2px 4px;border-radius:6px;margin-bottom:2px}.score-display.white{background-color:#444;border:2px solid #b58863}.score-display.black{background-color:#222;border:2px solid #555}.clock-display{padding:2px 6px;border-radius:8px;font-size:1.4rem;font-weight:700}.clock-display.active{background:#667eea;color:#fff}.clock-display.inactive{background:#e0e0e0;color:#555}.check-notification{position:absolute;top:1rem;left:50%;transform:translate(-50%);background-color:#f44336;color:#fff;padding:.5rem 1rem;border-radius:4px;font-weight:700;z-index:1000}.gameover-notification{position:absolute;top:1rem;left:50%;transform:translate(-50%);background-color:#222;color:#fff;padding:.75rem 1.5rem;border-radius:6px;font-weight:700;font-size:1.2rem;z-index:1100;box-shadow:0 2px 8px #0003}.chessboard{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:min(calc(100vw - 2rem),calc(100vh - 16rem),550px);height:min(calc(100vw - 2rem),calc(100vh - 16rem),550px);max-width:550px;max-height:550px;aspect-ratio:1 / 1;border:2px solid #333;box-shadow:0 2px 12px #00000026;background:#fff;flex-shrink:0;margin-bottom:2px}.square{position:relative;box-sizing:border-box;width:100%;height:100%;display:flex;align-items:center;justify-content:center}.square.clickable{cursor:pointer}.square.not-clickable{cursor:default}.square.light{background:#f0d9b5}.square.dark{background:#b58863}.square.selected{box-shadow:inset 0 0 0 3px #ffeb3b;background-color:#ffeb3b4d}.square.selected.light{background-color:#ffeb3b66}.square.selected.dark{background-color:#ffc10780}.square.last-move{box-shadow:0 0 0 4px #4fc3f7 inset,0 0 8px #4fc3f7;z-index:2}.square.valid-move:after{content:"";width:25%;height:25%;border-radius:50%;background:#00800080;position:absolute}.square:hover{opacity:.9}.navigation-controls{display:flex;justify-content:center;align-items:center;gap:4px;margin-top:2px}.nav-button{padding:4px 8px;font-size:1.3rem;background:#667eea;color:#fff;border:none;border-radius:6px;cursor:pointer;transition:all .2s;box-shadow:0 2px 4px #0003}.nav-button:hover:not(:disabled){background:#5568d3;transform:translateY(-1px);box-shadow:0 4px 8px #0000004d}.nav-button:active:not(:disabled){transform:translateY(0);box-shadow:0 2px 4px #0003}.nav-button:disabled{background:#ccc;color:#666;cursor:not-allowed;box-shadow:none}.game-setup-container{display:flex;justify-content:center;align-items:flex-start;min-height:100vh;width:100vw;background:linear-gradient(135deg,#667eea,#764ba2);padding:2rem 0;overflow-y:auto}.game-setup-card{background:#fff;border-radius:20px;padding:2rem;box-shadow:0 20px 60px #0000004d;max-width:600px;width:90%;margin:auto;max-height:calc(100vh - 4rem);overflow-y:auto}.game-setup-card h1{text-align:center;color:#333;margin-bottom:1.5rem;font-size:2rem}.player-selection{display:flex;gap:1.5rem;align-items:center;justify-content:center;margin-bottom:1.5rem}.player-option{flex:1}.player-option h2{text-align:center;color:#555;margin-bottom:.75rem;font-size:1.2rem}.radio-group{display:flex;flex-direction:column;gap:.75rem}.radio-group label{display:flex;align-items:center;padding:.75rem;border:2px solid #ddd;border-radius:10px;cursor:pointer;transition:all .3s ease;background:#f9f9f9}.radio-group label:hover{border-color:#667eea;background:#f0f4ff}.radio-group label.selected{border-color:#667eea;background:#e8eeff;box-shadow:0 2px 8px #667eea4d}.radio-group input[type=radio]{margin-right:.75rem;width:20px;height:20px;cursor:pointer}.radio-group span{font-size:1.1rem;font-weight:500;color:#333}.vs-divider{font-size:2rem;font-weight:700;color:#667eea;padding:0 1rem}.start-button{width:100%;padding:.85rem 2rem;font-size:1.2rem;font-weight:700;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:10px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea66;margin-top:1.5rem}.start-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea99}.start-button:active{transform:translateY(0)}.ai-settings{margin:2rem 0 1rem;text-align:center;min-width:180px}.ai-settings h2{color:#555;margin-bottom:1rem;font-size:1.3rem;text-align:center;margin-bottom:.5rem;font-size:1.1rem}.ai-settings-container{display:flex;gap:1.5rem;margin-top:1.5rem;justify-content:center}.ai-setting-group{margin-bottom:.5rem}.ai-setting-group label{display:block;font-weight:600;margin-bottom:3px;font-size:.9rem;color:#333}.clock-section{margin-top:1rem;padding:1.2rem;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:12px;box-shadow:0 4px 6px #0000001a}.clock-section h2{margin:0 0 .75rem;text-align:center;color:#fff;font-size:1.1rem}.clock-toggle{display:flex;align-items:center;justify-content:center;gap:.75rem;margin-bottom:.75rem}.clock-toggle label{display:flex;align-items:center;gap:.5rem;cursor:pointer;color:#fff;font-size:1rem}.clock-toggle input[type=checkbox]{width:18px;height:18px;cursor:pointer}.clock-time-selector{background:#fffffff2;padding:.85rem;border-radius:8px}.clock-time-selector label{display:block;font-weight:600;margin-bottom:5px;text-align:center;color:#333;font-size:.9rem}.clock-time-selector select{width:100%;padding:.6rem;font-size:1rem;border-radius:6px;border:2px solid #667eea;background:#fff}.move-time-select{width:100%;padding:.75rem;font-size:1.1rem;border:2px solid #ddd;border-radius:8px;background:#f9f9f9;cursor:pointer;transition:all .3s ease}.move-time-select:hover{border-color:#667eea;background:#f0f4ff}.move-time-select:focus{outline:none;border-color:#667eea;background:#e8eeff;box-shadow:0 2px 8px #667eea4d}@media(max-width:600px){.player-selection{flex-direction:column}.vs-divider{transform:rotate(90deg);padding:1rem 0}.game-setup-card{padding:2rem}.game-setup-card h1{font-size:2rem}}