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var(--transition-fast)}.difficulty-btn:hover{background-color:var(--color-gray-200)}.difficulty-btn.active{background-color:var(--color-primary);color:var(--text-inverse);border-color:var(--color-primary)}.difficulty-info{display:block;margin-top:var(--spacing-sm);font-size:var(--text-sm);color:var(--text-secondary);text-align:center}.chess-game{display:flex;flex-direction:column;max-width:1200px;margin:0 auto;padding:var(--spacing-md);min-height:100vh}.game-content{display:flex;flex-direction:column;gap:var(--spacing-lg);flex:1}.board-section{display:flex;justify-content:center;position:relative}.fullscreen-enter-btn{position:absolute;bottom:var(--spacing-sm);right:var(--spacing-sm);width:40px;height:40px;padding:0;border:none;border-radius:var(--radius-md);background:#0009;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:.6;transition:opacity var(--transition-fast),transform 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var(--transition-fast)}.player-info.active{background-color:var(--color-primary-light)}.player-avatar{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-full);background-color:var(--bg-tertiary)}.avatar-piece{font-size:var(--text-2xl)}.avatar-piece.white{color:var(--color-gray-700)}.avatar-piece.black{color:var(--color-gray-800)}.player-details{display:flex;flex-direction:column}.player-name{font-weight:600;font-size:var(--text-sm);color:var(--text-primary)}.difficulty-label{font-weight:400;color:var(--text-secondary);margin-left:var(--spacing-xs)}.player-rating{font-size:var(--text-xs);color:var(--text-secondary)}.turn-indicator{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-md);background-color:var(--bg-tertiary);border-radius:var(--radius-full)}.turn-dot{width:12px;height:12px;border-radius:var(--radius-full);transition:all var(--transition-fast)}.turn-dot.white{background-color:var(--color-gray-200);border:2px solid var(--color-gray-400)}.turn-dot.black{background-color:var(--color-gray-800);border:2px solid var(--color-gray-600)}.turn-dot.thinking{animation:pulse 1s ease-in-out infinite}.turn-text{font-size:var(--text-sm);font-weight:500;color:var(--text-secondary)}.check-indicator{font-size:var(--text-xs);font-weight:600;color:var(--color-danger);padding:var(--spacing-xs) var(--spacing-sm);background-color:var(--color-danger-light);border-radius:var(--radius-sm)}@media(max-width:768px){.game-header{padding:var(--spacing-sm)}.header-content{flex-direction:column;gap:var(--spacing-sm)}.player-info{width:100%;justify-content:flex-start}}.board-container{position:relative;-webkit-user-select:none;user-select:none}.board{display:flex;flex-direction:column;background-color:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:var(--spacing-sm)}.board-labels{display:flex;align-items:center;padding:0 var(--spacing-xs)}.board-labels-top,.board-labels-bottom{height:20px}.corner-label{width:20px}.file-label{width:var(--square-size);text-align:center;font-size:var(--text-xs);font-weight:600;color:var(--text-tertiary);text-transform:lowercase}.board-main{display:flex}.rank-labels{display:flex;flex-direction:column;width:20px}.rank-label{height:var(--square-size);display:flex;align-items:center;justify-content:center;font-size:var(--text-xs);font-weight:600;color:var(--text-tertiary)}.squares-container{display:flex;flex-direction:column;border-radius:var(--radius-sm);overflow:hidden}.board-row{display:flex}.square{width:var(--square-size);height:var(--square-size);display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;transition:background-color 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var(--color-gray-400)}.legal-move-indicator{position:absolute;width:30%;height:30%;background-color:var(--legal-move-color);border-radius:var(--radius-full);pointer-events:none}.square.legal-capture .legal-move-indicator{display:none}.square.legal-capture:after{content:"";position:absolute;inset:0;border:4px solid var(--legal-move-color);border-radius:var(--radius-sm);pointer-events:none}.ai-thinking-overlay{position:absolute;inset:0;background-color:#0000004d;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:var(--spacing-md);border-radius:var(--radius-lg);color:var(--color-white);font-weight:500}.ai-thinking-spinner{width:40px;height:40px;border:4px solid rgba(255,255,255,.3);border-top-color:var(--color-white);border-radius:var(--radius-full);animation:spin 1s linear infinite}.game-controls{background-color:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:var(--spacing-md)}.controls-row{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.controls-row+.controls-row{margin-top:var(--spacing-sm);padding-top:var(--spacing-sm);border-top:1px solid var(--border-color)}@media(max-width:768px){.control-btn .btn-text{display:none}.control-btn{padding:var(--spacing-sm)}}.settings-panel{position:absolute;top:100%;right:0;width:300px;background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);z-index:100;margin-top:var(--spacing-sm)}.settings-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);border-bottom:1px solid var(--border-color)}.settings-header h3{font-size:var(--text-lg);font-weight:600}.settings-content{padding:var(--spacing-md)}.setting-group{margin-bottom:var(--spacing-lg)}.setting-group:last-child{margin-bottom:0}.theme-options{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--spacing-sm)}.theme-option{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm);background:none;border:2px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.theme-option:hover{background-color:var(--bg-tertiary)}.theme-option.active{border-color:var(--color-primary);background-color:var(--color-primary-light)}.theme-option:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.theme-preview{display:grid;grid-template-columns:repeat(2,1fr);width:32px;height:32px;border-radius:var(--radius-sm);overflow:hidden}.preview-square{width:16px;height:16px}.theme-name{font-size:var(--text-xs);color:var(--text-secondary)}.move-history{background-color:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:0;display:flex;flex-direction:column;max-height:300px}.history-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);border-bottom:1px solid var(--border-color)}.history-title{font-size:var(--text-base);font-weight:600}.history-list{flex:1;overflow-y:auto;padding:var(--spacing-sm)}.history-list-header{display:grid;grid-template-columns:2rem 1fr 1fr;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--text-xs);font-weight:600;color:var(--text-tertiary);text-transform:uppercase;border-bottom:1px solid var(--border-color);margin-bottom:var(--spacing-sm)}.move-pair{display:grid;grid-template-columns:2rem 1fr 1fr;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm)}.move-pair:hover{background-color:var(--bg-tertiary)}.move-number-col{color:var(--text-tertiary);font-size:var(--text-sm)}.white-move,.black-move{font-family:Courier New,Courier,monospace;font-size:var(--text-sm)}.move-item.current{background-color:var(--color-primary-light);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm);font-weight:600}.history-empty{display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl);color:var(--text-tertiary);font-style:italic}.game-result-indicator{padding:var(--spacing-md);text-align:center;font-weight:600;border-top:1px solid var(--border-color);margin-top:var(--spacing-sm)}@media(max-width:768px){.move-history{max-height:200px}}@media(min-width:1024px){.move-history{max-height:400px}}.dialog-overlay{position:fixed;inset:0;background:#000000b3;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px;animation:dialog-fade-in .2s ease-out}.dialog-content{background:var(--surface-tertiary);border-radius:16px;width:100%;max-width:400px;max-height:calc(100vh - 32px);overflow:hidden;display:flex;flex-direction:column;box-shadow:0 16px 48px #0006;border:1px solid var(--border-subtle);animation:dialog-slide-in .25s var(--easing-standard)}.dialog-content.dialog-sm{max-width:320px}.dialog-content.dialog-md{max-width:400px}.dialog-content.dialog-lg{max-width:500px}.dialog-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--border-subtle)}.dialog-title{margin:0;font-family:system-ui,-apple-system,sans-serif;font-size:20px;font-weight:600;color:var(--text-primary)}.dialog-close{display:flex;align-items:center;justify-content:center;flex:0 0 44px;width:44px;height:44px;min-width:44px;min-height:44px;padding:0;border:1px solid transparent;border-radius:50%;background:#ffffff14;color:var(--text-secondary);line-height:0;appearance:none;cursor:pointer;transition:all .15s ease-out}.dialog-close:hover{background:#ffffff24;color:var(--text-primary);border-color:var(--border-subtle)}.dialog-close:active{background:#fff3}.dialog-close:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media(prefers-color-scheme:light){.dialog-close{background:#0000000d}.dialog-close:hover{background:#0000001a}.dialog-close:active{background:#00000026}}.dialog-close svg{width:24px;height:24px;flex-shrink:0}.dialog-body{flex:1;overflow-y:auto;padding:24px;-webkit-overflow-scrolling:touch}.dialog-footer{display:flex;justify-content:flex-end;gap:12px;padding:16px 24px;border-top:1px solid var(--border-subtle)}@media(max-width:480px){.dialog-content{max-width:none;max-height:calc(100vh - 32px);border-radius:16px 16px 0 0;position:fixed;bottom:0;left:0;right:0}.dialog-overlay{align-items:flex-end;padding:0}}.modal-overlay{position:fixed;inset:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-md);animation:fadeIn var(--transition-fast)}.modal-content{background-color:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);max-width:400px;width:100%;animation:slideUp var(--transition-normal)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);border-bottom:1px solid var(--border-color)}.modal-header h2{font-size:var(--text-xl);font-weight:600}.modal-body{padding:var(--spacing-lg)}.modal-footer{display:flex;gap:var(--spacing-sm);padding:var(--spacing-lg);border-top:1px solid var(--border-color)}.modal-footer .btn{flex:1}.fullscreen-modal-overlay{position:fixed;inset:0;background:#000000b3;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px;animation:modal-fade-in .2s ease-out}.fullscreen-modal-content{background:var(--surface-tertiary);border-radius:16px;width:100%;max-width:400px;max-height:calc(100vh - 32px);overflow:hidden;display:flex;flex-direction:column;border:1px solid var(--border-subtle);box-shadow:0 16px 48px #0006;animation:modal-slide-in .25s var(--easing-standard)}.fullscreen-modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--border-subtle)}.fullscreen-modal-header h2{margin:0;font-family:system-ui,-apple-system,sans-serif;font-size:20px;font-weight:600;color:var(--text-primary)}.fullscreen-modal-close{display:flex;align-items:center;justify-content:center;flex:0 0 44px;width:44px;height:44px;min-width:44px;min-height:44px;padding:0;border:1px solid transparent;border-radius:50%;background:#ffffff14;color:var(--text-secondary);line-height:0;appearance:none;cursor:pointer;transition:all .15s ease-out}.fullscreen-modal-close:hover{background:#ffffff24;color:var(--text-primary);border-color:var(--border-subtle)}.fullscreen-modal-close:active{background:#fff3}.fullscreen-modal-close:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@media(prefers-color-scheme:light){.fullscreen-modal-close{background:#0000000d}.fullscreen-modal-close:hover{background:#0000001a}.fullscreen-modal-close:active{background:#00000026}}.fullscreen-modal-close{font-size:24px}.fullscreen-modal-body{flex:1;overflow-y:auto;padding:24px;-webkit-overflow-scrolling:touch}.fullscreen-modal-footer{display:flex;justify-content:flex-end;gap:12px;padding:16px 24px;border-top:1px solid var(--border-subtle)}@media(max-width:480px){.modal-content{margin:var(--spacing-md)}.fullscreen-modal-content{max-width:none;max-height:calc(100vh - 32px);border-radius:16px 16px 0 0;position:fixed;bottom:0;left:0;right:0}.fullscreen-modal-overlay{align-items:flex-end;padding:0}.fullscreen-modal-header{padding:16px 20px}.fullscreen-modal-body{padding:20px}}@media(prefers-reduced-motion:reduce){.fullscreen-modal-overlay,.fullscreen-modal-content{animation:none}}.toast-container{position:fixed;top:calc(24px + env(safe-area-inset-top));left:50%;transform:translate(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;pointer-events:none;max-width:calc(100vw - 32px)}.toast{display:flex;align-items:center;gap:12px;padding:12px 20px;border-radius:12px;background:#2a2a2af2;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 4px 16px #0000004d;border:1px solid var(--border-subtle);pointer-events:auto;cursor:pointer;transition:all .15s ease-out}.toast:hover{transform:scale(1.02)}@media(prefers-color-scheme:light){.toast{background:#fffffff2;box-shadow:0 4px 16px #00000026}}.toast-message{font-family:system-ui,-apple-system,sans-serif;font-size:14px;font-weight:500;color:var(--text-primary);white-space:nowrap}.toast-success{border-left:3px solid var(--color-primary)}.toast-success .toast-message{color:#81c784}.toast-info{border-left:3px solid #2196f3}.toast-info .toast-message{color:#64b5f6}.toast-warning{border-left:3px solid #ff9800}.toast-warning .toast-message{color:#ffb74d}.toast-error{border-left:3px solid #f44336}.toast-error .toast-message{color:#e57373}.toast-enter{animation:toast-slide-in .2s ease-out}.toast-exit{animation:toast-slide-out .2s ease-in forwards}@media(prefers-reduced-motion:reduce){.toast-enter,.toast-exit{animation:none}}.game-result-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100}.game-result-modal{text-align:center;max-width:360px;overflow:hidden;background:linear-gradient(135deg,#1a1a2e,#16213e);border-radius:16px;padding:0;box-shadow:0 20px 60px #00000080;width:90%}.game-result-modal.animating{animation:resultBounce var(--transition-slow)}.game-result-modal.win{border:3px solid var(--color-success)}.game-result-modal.win .result-title{color:var(--color-success)}.game-result-modal.loss{border:3px solid var(--color-danger)}.game-result-modal.loss .result-title{color:var(--color-danger)}.game-result-modal.draw{border:3px solid #2196f3}.game-result-modal.draw .result-title{color:#2196f3}@media(prefers-color-scheme:light){.game-result-modal{background:linear-gradient(135deg,#f8f9fa,#e9ecef)}}.result-header{padding:var(--spacing-xl) var(--spacing-lg) var(--spacing-md)}.result-title{font-size:var(--text-2xl);font-weight:700;margin-bottom:var(--spacing-sm)}.result-icon{font-size:var(--text-4xl)}.result-icon-large{font-size:4rem;line-height:1;animation:result-icon-bounce .6s ease-out}.result-content{padding:1.5rem;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.result-message{padding:0 var(--spacing-lg) var(--spacing-lg);color:var(--text-secondary);font-size:1.125rem;text-align:center;margin:0;line-height:1.6}.result-stats{padding:var(--spacing-lg);background-color:var(--bg-tertiary);width:100%;border-radius:12px;display:flex;flex-direction:column;gap:1rem}@media(prefers-color-scheme:light){.result-stats{background:#0000000a}}.stat-row{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-sm) 0;font-size:.875rem}.stat-row:not(:last-child){border-bottom:1px solid var(--border-color)}.stat-row.record{padding-top:.75rem;border-top:1px solid var(--border-subtle)}.stat-row.record .stat-value{display:flex;gap:var(--spacing-sm)}.stat-row.record .wins{color:var(--color-success)}.stat-row.record .losses{color:var(--color-danger)}.stat-row.record .draws{color:#2196f3}.stat-row.record .separator{color:var(--text-tertiary);margin:0 .5rem}@media(prefers-color-scheme:light){.stat-row.record .separator{color:#0000004d}}.stat-label{font-size:var(--text-sm);color:var(--text-secondary);font-weight:500;text-transform:uppercase;letter-spacing:.05em}.stat-value{font-weight:600;font-size:.875rem;color:var(--text-primary)}.rating-change{display:flex;flex-direction:column;align-items:flex-end}.rating-values{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--text-sm)}.old-rating,.rating-arrow{color:var(--text-tertiary)}.new-rating{font-weight:700}.rating-delta{font-size:var(--text-xs);font-weight:600;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-full)}.rating-delta.positive{background-color:var(--color-success-light);color:var(--color-success)}.rating-delta.negative{background-color:var(--color-danger-light);color:var(--color-danger)}.rating-delta.neutral{background-color:var(--bg-tertiary);color:var(--text-secondary)}.streak-display{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:linear-gradient(135deg,var(--color-warning) 0%,#f97316 100%);color:var(--color-white);border-radius:var(--radius-md);margin-top:var(--spacing-sm)}.streak-emoji{font-size:var(--text-xl)}.streak-text{font-weight:600}.win-streak-badge{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);background:linear-gradient(135deg,var(--color-warning) 0%,#f97316 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var(--color-gray-900);--text-secondary: var(--color-gray-600);--text-tertiary: var(--color-gray-400);--text-inverse: var(--color-white);--border-color: var(--color-gray-200);--border-color-hover: var(--color-gray-300);--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--board-size: min(90vw, 500px);--square-size: 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