.promotion-modal-overlay{position:fixed;inset:0;background:#000000b3;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.promotion-modal{background:#fff;border-radius:16px;box-shadow:0 8px 32px #0000004d;padding:0;max-width:400px;width:300px;animation:modalSlideIn .3s ease-out;position:absolute}@keyframes modalSlideIn{0%{opacity:0;transform:translateY(-20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.promotion-content{padding:2rem;text-align:center}.promotion-content h3{margin:0 0 .5rem;color:#2c3e50;font-size:1.4rem;font-weight:700}.promotion-info{margin:0 0 1.5rem;color:#666;font-size:.95rem}.promotion-pieces{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-bottom:1.5rem}.promotion-piece-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1.5rem 1rem;border:2px solid #e9ecef;border-radius:12px;background:#f8f9fa;cursor:pointer;transition:all .2s 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ease}.cancel-btn:hover{background:#c82333;border-color:#c82333;transform:translateY(-1px)}.cancel-btn:active{transform:translateY(0)}@media(max-width:480px){.promotion-modal{width:95%;margin:1rem}.promotion-content{padding:1.5rem}.promotion-pieces{grid-template-columns:1fr;gap:.75rem}.promotion-piece-btn{padding:1rem;min-height:60px}.piece-symbol{font-size:2rem}}.promotion-dropdown-overlay{position:fixed;inset:0;background:#0000004d;z-index:1000}.promotion-dropdown{background:#fff;border-radius:8px;box-shadow:0 4px 16px #0000004d;padding:8px;width:200px;animation:dropdownSlideIn .2s ease-out;position:absolute;border:1px solid #e0e0e0}@keyframes dropdownSlideIn{0%{opacity:0;transform:translateY(-10px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.promotion-dropdown-content{display:flex;flex-direction:column;gap:4px}.promotion-piece-option{display:flex;align-items:center;justify-content:center;padding:12px 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.piece-symbol{font-size:1.8rem}}.game-result-modal-overlay{position:fixed;inset:0;background-color:#000000b3;display:flex;justify-content:center;align-items:center;z-index:1000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.game-result-modal{background:linear-gradient(135deg,#2c3e50,#34495e);border-radius:20px;padding:30px;max-width:400px;width:90%;box-shadow:0 20px 40px #0000004d;border:2px solid #3498db;animation:modalSlideIn .3s ease-out}@keyframes modalSlideIn{0%{opacity:0;transform:translateY(-50px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}.game-result-content{text-align:center;color:#fff}.game-result-icon{font-size:4rem;margin-bottom:20px;animation:iconBounce .6s ease-out}@keyframes iconBounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-20px)}60%{transform:translateY(-10px)}}.game-result-title{font-size:2.5rem;margin:0 0 15px;color:#f39c12;text-shadow:2px 2px 4px 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#e74c3c99}@media(max-width:480px){.game-result-modal{padding:20px;margin:20px}.game-result-title{font-size:2rem}.game-result-text{font-size:1rem}.game-result-actions{flex-direction:column;align-items:center}.btn-new-game,.btn-close{width:100%;max-width:200px}}.mainline-variations{background:linear-gradient(135deg,#2c3e50,#34495e);border-radius:12px;padding:20px;margin:16px 0;border:2px solid #34495e;min-width:0;width:100%;max-width:100%;box-sizing:border-box;box-shadow:0 4px 12px #0003;overflow-x:hidden}.section-title{color:#ecf0f1;font-size:20px;font-weight:700;margin:0 0 12px;text-align:center;text-transform:uppercase;letter-spacing:1px;background:linear-gradient(135deg,#3498db4d,#2980b94d);padding:12px 20px;border-radius:8px;border:1px solid rgba(52,152,219,.2)}.eval-legend{margin:0 0 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#bdc3c7}.variation-moves-detailed{display:flex;flex-direction:column;gap:6px}.variation-move-detailed{display:flex;justify-content:space-between;align-items:center;padding:6px 10px;background:linear-gradient(135deg,#2c3e50,#34495e);border-radius:6px;border:1px solid rgba(255,255,255,.05);transition:all .2s ease}.variation-move-detailed:hover{background:linear-gradient(135deg,#34495e,#4a5f7a);transform:translate(2px);box-shadow:0 2px 4px #0003}.move-san{color:#ecf0f1;font-weight:600;font-size:14px;background:#34495e99;padding:3px 8px;border-radius:4px;border:1px solid rgba(255,255,255,.1)}.move-evaluation{padding:3px 6px;border-radius:4px;font-size:11px;font-weight:600;min-width:32px;text-align:center;box-shadow:0 1px 3px #0003;border:1px solid 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0}.mainline-container{width:100%;max-width:none}.mainline-move{padding:10px;margin-bottom:10px}.section-title{font-size:15px;padding:8px 12px}.played-san{font-size:15px}.played-evaluation{font-size:13px;padding:3px 8px;min-width:44px}.played-move-row{gap:6px;padding:6px 8px}}.chess-viewer{display:flex;flex-direction:column;gap:1rem;max-width:1200px;width:100%;min-width:0;margin:0 auto;padding:1rem;background:#faf8f5;border-radius:12px;box-shadow:0 4px 20px #00000026;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;min-height:0;overflow:visible;box-sizing:border-box}.chess-viewer-main{--board-size: min(600px, 100%, calc(100dvh - 12.5rem) );display:flex;flex-direction:column;align-items:center;gap:.65rem;width:min(100%,var(--board-size));flex:1 1 auto;min-width:0;min-height:0}.chess-board-container{width:100%;max-width:100%;min-width:0;aspect-ratio:1 / 1;height:auto;position:relative;box-shadow:0 4px 15px #0003;border-radius:8px;overflow:hidden;flex:0 0 auto;container-type:inline-size}.variation-mode-indicator{position:absolute;top:-40px;left:0;right:0;background:linear-gradient(135deg,#28a745,#20c997);color:#fff;padding:8px 16px;border-radius:8px;text-align:center;font-weight:700;font-size:.9rem;z-index:100;box-shadow:0 2px 8px #28a7454d;animation:slideDown .3s ease-out}@keyframes slideDown{0%{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}.chess-board{width:100%;height:100%;position:relative;background:#5c4a3a;border:3px solid #5c4a3a;border-radius:6px;box-sizing:border-box;overflow:hidden}.board-coordinates{position:absolute;z-index:10;pointer-events:none}.board-coordinates.files{bottom:1px;left:0;right:0;height:16px;display:grid;grid-template-columns:repeat(8,minmax(0,1fr))}.board-coordinates.ranks{top:0;bottom:0;left:1px;width:14px;display:grid;grid-template-rows:repeat(8,minmax(0,1fr))}.coordinate{display:flex;font-size:11px;font-weight:700;line-height:1;min-width:0}.board-coordinates.files .coordinate{align-items:flex-end;justify-content:flex-end;padding:0 4px 2px 0}.board-coordinates.files .coordinate:nth-child(odd){color:#f0d9b5}.board-coordinates.files .coordinate:nth-child(2n){color:#b58863}.board-coordinates.ranks .coordinate{align-items:flex-start;justify-content:flex-start;padding:2px 0 0 3px}.board-coordinates.ranks .coordinate:nth-child(odd){color:#b58863}.board-coordinates.ranks .coordinate:nth-child(2n){color:#f0d9b5}.board-squares{position:absolute;inset:0;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr))}.square{width:100%;height:100%;min-width:0;min-height:0;display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;overflow:hidden;transition:background-color .15s ease,box-shadow .15s ease}.square.light{background-color:#f0d9b5}.square.dark{background-color:#b58863}.square.selected{background-color:#cdd26a!important;box-shadow:inset 0 0 0 3px 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