@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=DM+Serif+Display&display=swap";:root{font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px}:root{--color-bg-primary: #f8f6f3;--color-bg-secondary: #efecea;--color-bg-tertiary: #e5e2de;--color-surface: rgba(255, 255, 255, .72);--color-surface-elevated: rgba(255, 255, 255, .85);--color-surface-hover: rgba(255, 255, 255, .92);--color-text-primary: #2c2a27;--color-text-secondary: #6b6660;--color-text-tertiary: #9c958d;--color-accent: #8b7355;--color-accent-hover: #7a644a;--color-accent-light: rgba(139, 115, 85, .12);--color-sage: #a3aa9c;--color-sage-light: rgba(163, 170, 156, .15);--color-success: #6b8f71;--color-warning: #c9a962;--color-error: #b85c5c;--color-square-light: #f0e6d6;--color-square-dark: #b8a890;--color-square-selected: rgba(139, 115, 85, .4);--color-square-legal: rgba(139, 115, 85, .35);--color-square-last-move: rgba(194, 178, 128, .45);--color-square-check: rgba(184, 92, 92, .5);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-display: "DM Serif Display", Georgia, serif;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--spacing-3xl: 64px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--shadow-xs: 0 1px 2px rgba(44, 42, 39, .04);--shadow-sm: 0 2px 4px rgba(44, 42, 39, .06);--shadow-md: 0 4px 12px rgba(44, 42, 39, .08);--shadow-lg: 0 8px 24px rgba(44, 42, 39, .1);--shadow-xl: 0 16px 48px rgba(44, 42, 39, .12);--glass-blur: blur(20px);--glass-border: 1px solid rgba(255, 255, 255, .5);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--color-bg-primary);color:var(--color-text-primary);line-height:1.5;min-height:100vh;overflow-x:hidden}#root{min-height:100vh;max-width:none;margin:0;padding:0;text-align:left}.app{min-height:100vh;background:radial-gradient(ellipse at 30% 20%,rgba(163,170,156,.08) 0%,transparent 50%),radial-gradient(ellipse at 70% 80%,rgba(139,115,85,.06) 0%,transparent 50%),var(--color-bg-primary)}.start-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl);position:relative;overflow:hidden}.start-content{width:100%;max-width:640px;display:flex;flex-direction:column;gap:var(--spacing-2xl);position:relative;z-index:1}.logo-section{text-align:center}.logo{margin-bottom:var(--spacing-lg);filter:drop-shadow(0 8px 24px rgba(139,115,85,.2))}.logo-section h1{font-family:var(--font-display);font-size:3.5rem;font-weight:400;letter-spacing:-.02em;color:var(--color-text-primary);margin-bottom:var(--spacing-xs)}.tagline{font-size:1.125rem;color:var(--color-text-secondary);font-weight:400}.mode-section h2,.difficulty-section h2,.time-section h2{font-size:.8125rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-tertiary);margin-bottom:var(--spacing-md)}.mode-options{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md)}.mode-card{background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-sm)}.mode-card:hover{background:var(--color-surface-elevated);box-shadow:var(--shadow-md);transform:translateY(-2px)}.mode-card.selected{background:var(--color-surface-elevated);border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-light),var(--shadow-md)}.mode-icon{width:56px;height:56px;margin:0 auto var(--spacing-md);background:var(--color-accent-light);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--color-accent)}.mode-icon svg{width:28px;height:28px}.mode-card h3{font-size:1.125rem;font-weight:600;margin-bottom:var(--spacing-xs);color:var(--color-text-primary)}.mode-card p{font-size:.875rem;color:var(--color-text-secondary)}.difficulty-options,.time-options{display:flex;gap:var(--spacing-sm)}.difficulty-btn,.time-btn{flex:1;background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-md);padding:var(--spacing-md);text-align:center;cursor:pointer;transition:all var(--transition-base)}.difficulty-btn:hover,.time-btn:hover{background:var(--color-surface-elevated)}.difficulty-btn.selected,.time-btn.selected{background:var(--color-surface-elevated);border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-light)}.difficulty-label,.time-label{display:block;font-size:1rem;font-weight:600;text-transform:capitalize;color:var(--color-text-primary);margin-bottom:2px}.difficulty-desc,.time-desc{display:block;font-size:.75rem;color:var(--color-text-tertiary)}.start-action{padding-top:var(--spacing-md)}.decorative-bg{position:absolute;inset:0;pointer-events:none;overflow:hidden}.grid-pattern{position:absolute;inset:0;opacity:.03;background-image:linear-gradient(var(--color-text-primary) 1px,transparent 1px),linear-gradient(90deg,var(--color-text-primary) 1px,transparent 1px);background-size:60px 60px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);font-family:var(--font-sans);font-size:.9375rem;font-weight:600;border-radius:var(--radius-md);border:none;cursor:pointer;transition:all var(--transition-base)}.btn-primary{background:var(--color-accent);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--color-accent-hover);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--color-surface);color:var(--color-text-primary);border:1px solid var(--color-bg-tertiary)}.btn-secondary:hover{background:var(--color-surface-elevated);border-color:var(--color-bg-secondary)}.btn-large{padding:var(--spacing-lg) var(--spacing-2xl);font-size:1rem;width:100%}.game-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl)}.game-layout{display:flex;gap:var(--spacing-xl);align-items:flex-start;max-width:1200px}.chess-board-wrapper{flex-shrink:0}.chess-board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:600px;height:600px;aspect-ratio:1 / 1;border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 0 0 4px #8b735526,var(--shadow-xl),0 50px 100px #2c2a2726;background:linear-gradient(135deg,#c9b896,#a89474);position:relative}.chess-board:before{content:"";position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");opacity:.03;pointer-events:none;z-index:10}.square{position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background-color var(--transition-fast)}.square.light{background:var(--color-square-light)}.square.dark{background:var(--color-square-dark)}.square.selected{background:var(--color-square-selected)!important}.square.last-move{background:var(--color-square-last-move)!important}.square.in-check{background:var(--color-square-check)!important;animation:check-pulse 1.5s ease-in-out infinite}@keyframes 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svg{max-width:85%;max-height:85%;width:auto;height:auto}.board-area{display:flex;flex-direction:column;gap:var(--spacing-md);align-items:center}.board-wrapper{position:relative}.pause-overlay{position:absolute;inset:0;background:#2c2a27d9;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:20}.pause-content{text-align:center;color:#fff;padding:var(--spacing-2xl)}.pause-icon{font-size:4rem;margin-bottom:var(--spacing-lg);opacity:.9}.pause-content h2{font-family:var(--font-display);font-size:2rem;font-weight:400;margin-bottom:var(--spacing-md)}.pause-content p{font-size:1rem;opacity:.8;max-width:280px}.captured-pieces-container{width:100%;max-width:600px;background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-md);padding:var(--spacing-md);box-shadow:var(--shadow-sm)}.captured-header{font-size:.6875rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-tertiary);margin-bottom:var(--spacing-sm);text-align:center}.captured-content{display:flex;justify-content:space-between;gap:var(--spacing-lg)}.captured-section{flex:1;display:flex;flex-direction:column;gap:var(--spacing-xs)}.captured-section:first-child{align-items:flex-start}.captured-section:last-child{align-items:flex-end}.captured-label{display:flex;align-items:center;gap:var(--spacing-sm);font-size:.75rem;font-weight:600;color:var(--color-text-secondary)}.captured-section:last-child .captured-label{flex-direction:row-reverse}.player-indicator{text-transform:uppercase;letter-spacing:.05em}.material-advantage{background:var(--color-success);color:#fff;padding:2px 6px;border-radius:4px;font-size:.625rem;font-weight:700}.captured-pieces-row{display:flex;flex-wrap:wrap;gap:2px;min-height:32px;align-items:center}.captured-section:last-child .captured-pieces-row{justify-content:flex-end}.captured-piece{display:flex;align-items:center;justify-content:center;width:28px;height:28px;opacity:.85;transition:transform var(--transition-fast),opacity var(--transition-fast)}.captured-piece:hover{transform:scale(1.15);opacity:1}.captured-piece svg{width:100%;height:100%;filter:drop-shadow(0 1px 2px rgba(0,0,0,.15))}.no-captures{font-size:.875rem;color:var(--color-text-tertiary);opacity:.5}@media(max-width:680px){.captured-pieces-container{max-width:calc(100vw - 32px);padding:var(--spacing-sm)}.captured-content{gap:var(--spacing-md)}.captured-piece{width:24px;height:24px}.captured-pieces-row{min-height:28px}.captured-header{font-size:.625rem}.captured-label{font-size:.6875rem}}@media(max-width:400px){.captured-piece{width:20px;height:20px}.captured-pieces-row{min-height:24px;gap:1px}.material-advantage{font-size:.5625rem;padding:1px 4px}}.game-panel{width:320px;display:flex;flex-direction:column;gap:var(--spacing-md);height:600px}.player-card{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-md);transition:all var(--transition-base)}.player-card.active{background:var(--color-surface-elevated);box-shadow:0 0 0 2px var(--color-accent),var(--shadow-md)}.player-info{display:flex;align-items:center;gap:var(--spacing-md)}.player-avatar{width:40px;height:40px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.875rem}.player-avatar.white-player{background:#faf8f5;color:var(--color-text-primary);border:1px solid var(--color-bg-tertiary)}.player-avatar.black-player{background:#3d3a35;color:#faf8f5}.player-avatar svg{width:20px;height:20px}.player-details{display:flex;flex-direction:column}.player-name{font-weight:600;font-size:.9375rem;text-transform:capitalize}.thinking-indicator{font-size:.75rem;color:var(--color-accent);animation:thinking 1.5s ease-in-out infinite}@keyframes thinking{0%,to{opacity:.5}50%{opacity:1}}.timer{font-family:SF Mono,Monaco,Inconsolata,monospace;font-size:1.25rem;font-weight:600;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--radius-sm);color:var(--color-text-secondary);min-width:70px;text-align:center}.timer.active{background:var(--color-accent);color:#fff}.game-status{padding:var(--spacing-sm);text-align:center}.status-badge{display:inline-flex;align-items:center;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);font-weight:600;font-size:.875rem}.status-badge.check{background:#b85c5c26;color:var(--color-error)}.turn-indicator{display:inline-flex;align-items:center;gap:var(--spacing-sm);color:var(--color-text-secondary);font-size:.875rem}.turn-dot{width:10px;height:10px;border-radius:50%;border:2px solid var(--color-text-tertiary)}.turn-dot.white{background:#faf8f5}.turn-dot.black{background:#3d3a35}.move-history{flex:1;background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-md);display:flex;flex-direction:column;overflow:hidden}.move-history-header{padding:var(--spacing-md);border-bottom:1px solid var(--color-bg-tertiary);font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-tertiary)}.move-list{flex:1;overflow-y:auto;padding:var(--spacing-sm)}.move-list::-webkit-scrollbar{width:6px}.move-list::-webkit-scrollbar-track{background:transparent}.move-list::-webkit-scrollbar-thumb{background:var(--color-bg-tertiary);border-radius:3px}.no-moves{text-align:center;color:var(--color-text-tertiary);padding:var(--spacing-xl);font-size:.875rem}.move-row{display:grid;grid-template-columns:32px 1fr 1fr;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm);font-size:.875rem}.move-row:hover{background:var(--color-bg-secondary)}.move-number{color:var(--color-text-tertiary);font-weight:500}.move{font-family:SF Mono,Monaco,Inconsolata,monospace;padding:2px var(--spacing-xs);border-radius:3px}.move.white-move{background:#faf8f580}.move.black-move{background:#3d3a3514}.controls{display:flex;gap:var(--spacing-sm);padding:var(--spacing-sm) 0}.control-btn{flex:1;display:flex;align-items:center;justify-content:center;padding:var(--spacing-md);background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);color:var(--color-text-secondary)}.control-btn:hover:not(:disabled){background:var(--color-surface-elevated);color:var(--color-text-primary)}.control-btn:disabled{opacity:.4;cursor:not-allowed}.control-btn.resign{color:var(--color-error)}.control-btn.resign:hover:not(:disabled){background:#b85c5c1a}.control-btn.pause{color:var(--color-accent)}.control-btn.pause:hover:not(:disabled){background:var(--color-accent-light)}.control-btn.pause.active{background:var(--color-success);color:#fff}.control-btn.pause.active:hover:not(:disabled){background:var(--color-success);opacity:.9}.control-btn svg{width:20px;height:20px}.modal-overlay{position:fixed;inset:0;background:#2c2a2780;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;padding:var(--spacing-xl)}.modal{background:var(--color-bg-primary);border-radius:var(--radius-xl);padding:var(--spacing-2xl);box-shadow:var(--shadow-xl);max-width:400px;width:100%;text-align:center}.modal h2{font-family:var(--font-display);font-size:1.75rem;font-weight:400;margin-bottom:var(--spacing-sm)}.modal p{color:var(--color-text-secondary);margin-bottom:var(--spacing-xl)}.modal-actions{display:flex;flex-direction:column;gap:var(--spacing-sm)}.promotion-modal .promotion-pieces{display:flex;justify-content:center;gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.promotion-piece-btn{width:80px;height:80px;background:var(--color-surface);border:var(--glass-border);border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-base)}.promotion-piece-btn:hover{background:var(--color-surface-elevated);box-shadow:var(--shadow-md)}.end-game-modal .end-game-icon{width:72px;height:72px;margin:0 auto var(--spacing-lg);background:var(--color-accent-light);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--color-accent)}.end-game-icon svg{width:36px;height:36px}.menu-modal{text-align:left}.menu-modal h2{text-align:center;margin-bottom:var(--spacing-xl)}.menu-options{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-bottom:var(--spacing-xl)}.menu-option{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border:var(--glass-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);text-align:left;width:100%;font-family:var(--font-sans);font-size:.9375rem;color:var(--color-text-primary)}.menu-option:hover{background:var(--color-surface-elevated)}.menu-option svg{width:20px;height:20px;color:var(--color-text-secondary);flex-shrink:0}.close-btn{width:100%}.side-panels{display:flex;flex-direction:column;gap:var(--spacing-md);width:320px;max-height:600px}.game-layout.with-coach .side-panels{width:380px}.game-layout.with-coach .game-panel{height:auto;max-height:280px}.game-layout.with-coach .move-history{max-height:120px}.coach-toggle-btn{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);width:100%;padding:var(--spacing-md) var(--spacing-lg);background:linear-gradient(135deg,var(--color-sage-light) 0%,var(--color-accent-light) 100%);border:1px solid var(--color-sage);border-radius:var(--radius-md);color:var(--color-text-primary);font-family:var(--font-sans);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.coach-toggle-btn:hover{background:linear-gradient(135deg,#a3aa9c40,#8b735533);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.coach-panel{background:var(--color-surface);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-md);overflow:hidden;display:flex;flex-direction:column;flex:1;min-height:0}.coach-panel.collapsed{flex:none}.coach-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);border-bottom:1px solid var(--color-bg-tertiary);background:linear-gradient(135deg,var(--color-sage-light) 0%,transparent 100%)}.coach-title{display:flex;align-items:center;gap:var(--spacing-sm);font-weight:600;font-size:.9375rem}.coach-badge{font-size:.625rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;padding:2px 6px;background:var(--color-accent);color:#fff;border-radius:4px}.coach-header-actions{display:flex;gap:var(--spacing-xs)}.coach-header-btn{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius-sm);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.coach-header-btn:hover{background:var(--color-bg-secondary);color:var(--color-text-primary)}.coach-header-btn svg{width:16px;height:16px}.coach-content{display:flex;flex-direction:column;flex:1;min-height:0;overflow:hidden}.coach-quick-actions{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-xs);padding:var(--spacing-sm);border-bottom:1px solid var(--color-bg-tertiary)}.quick-action-btn{display:flex;align-items:center;justify-content:center;gap:var(--spacing-xs);padding:var(--spacing-sm);background:var(--color-bg-secondary);border:none;border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.75rem;font-weight:500;color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.quick-action-btn:hover:not(:disabled){background:var(--color-bg-tertiary);color:var(--color-text-primary)}.coach-chat{flex:1;overflow-y:auto;padding:var(--spacing-sm);min-height:150px}.coach-welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:var(--spacing-lg);height:100%}.coach-welcome .welcome-icon{font-size:2.5rem;margin-bottom:var(--spacing-sm)}.coach-welcome h3{font-size:1rem;font-weight:600;margin-bottom:var(--spacing-xs);color:var(--color-text-primary)}.coach-welcome p{font-size:.8125rem;color:var(--color-text-secondary);line-height:1.5}.chat-messages{display:flex;flex-direction:column;gap:var(--spacing-sm)}.chat-message{display:flex;gap:var(--spacing-sm);align-items:flex-start}.message-avatar{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.875rem;flex-shrink:0;background:var(--color-bg-secondary)}.chat-message.assistant .message-avatar{background:var(--color-sage-light)}.message-content{max-width:85%;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);font-size:.8125rem;line-height:1.5;white-space:pre-wrap;word-wrap:break-word}.typing-indicator span{width:6px;height:6px;border-radius:50%;background:var(--color-text-tertiary);animation:typing 1.4s ease-in-out infinite}@keyframes typing{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-4px)}}.coach-error{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);margin:0 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h1{font-family:var(--font-display);font-size:2rem;margin-bottom:var(--spacing-md);color:var(--color-text-primary)}.puzzle-stats{display:flex;gap:var(--spacing-lg)}.stat{display:flex;flex-direction:column;gap:var(--spacing-xs)}.stat-label{font-size:.75rem;font-weight:500;color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.05em}.stat-value{font-size:1.5rem;font-weight:700;color:var(--color-accent)}.puzzle-filters{background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);display:flex;flex-direction:column;gap:var(--spacing-md)}.filter-group{display:flex;flex-direction:column;gap:var(--spacing-sm)}.filter-group label{font-size:.875rem;font-weight:600;color:var(--color-text-secondary)}.filter-group select{padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);border:1px solid var(--color-bg-tertiary);background:#fff;color:var(--color-text-primary);font-family:var(--font-sans);font-size:.9375rem;font-weight:500;cursor:pointer;transition:all var(--transition-base)}.filter-group select:hover{border-color:var(--color-accent)}.filter-group select:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-light)}.puzzle-info{background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);display:flex;flex-direction:column;gap:var(--spacing-md)}.puzzle-title{font-size:1.125rem;font-weight:700;color:var(--color-text-primary)}.puzzle-difficulty{display:flex;align-items:center;gap:var(--spacing-md)}.difficulty-badge{padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-sm);font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.difficulty-badge.beginner{background:#6b8f7126;color:var(--color-success)}.difficulty-badge.intermediate{background:#c9a96226;color:var(--color-warning)}.difficulty-badge.advanced{background:#b85c5c26;color:var(--color-error)}.puzzle-rating{font-size:.875rem;font-weight:600;color:var(--color-text-secondary)}.puzzle-description{font-size:.9375rem;line-height:1.6;color:var(--color-text-secondary)}.player-turn-indicator{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);font-size:.875rem;font-weight:600}.player-turn-indicator.white-to-play{background:#faf8f580;border:2px solid #3d3a35;color:var(--color-text-primary)}.player-turn-indicator.black-to-play{background:#3d3a3526;border:2px solid #3d3a35;color:var(--color-text-primary)}.turn-dot-large{width:16px;height:16px;border-radius:50%;border:2px solid var(--color-text-tertiary)}.white-to-play .turn-dot-large{background:#faf8f5}.black-to-play .turn-dot-large{background:#3d3a35}.puzzle-extra-controls{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-sm)}.puzzle-extra-controls .btn-secondary{flex:1;padding:var(--spacing-md)}.puzzle-extra-controls .btn-secondary.active{background:var(--color-accent-light);border-color:var(--color-accent);color:var(--color-accent)}.puzzle-coach-panel{position:fixed;top:50%;right:var(--spacing-lg);transform:translateY(-50%);width:360px;max-height:80vh;background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);display:flex;flex-direction:column;overflow:hidden;z-index:100}.puzzle-coach-panel 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transparent;border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.8125rem;color:var(--color-text-primary)}.puzzle-coach-panel .coach-input:focus{outline:none;border-color:var(--color-accent)}.puzzle-browser-overlay{position:fixed;inset:0;background:#2c2a2780;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:200;padding:var(--spacing-xl)}.puzzle-browser{background:var(--color-bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:600px;max-height:80vh;display:flex;flex-direction:column;overflow:hidden}.browser-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);border-bottom:1px solid var(--color-bg-tertiary)}.browser-header h2{font-family:var(--font-display);font-size:1.5rem;font-weight:400}.browser-close-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--color-text-secondary);padding:var(--spacing-xs)}.browser-close-btn:hover{color:var(--color-text-primary)}.browser-filters{display:flex;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--color-bg-tertiary)}.browser-filters select{flex:1;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-sm);border:1px solid var(--color-bg-tertiary);background:#fff;font-family:var(--font-sans);font-size:.875rem;cursor:pointer}.puzzle-list{flex:1;overflow-y:auto;padding:var(--spacing-sm)}.puzzle-list-item{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);margin-bottom:var(--spacing-xs)}.puzzle-list-item:hover{background:var(--color-bg-secondary)}.puzzle-list-item.active{background:var(--color-accent-light);border:1px solid var(--color-accent)}.puzzle-list-item.solved{opacity:.7}.puzzle-list-info{display:flex;align-items:center;gap:var(--spacing-md)}.puzzle-list-theme{font-weight:600;color:var(--color-text-primary)}.difficulty-badge.small{padding:2px var(--spacing-sm);font-size:.625rem}.puzzle-list-meta{display:flex;align-items:center;gap:var(--spacing-md)}.puzzle-list-rating{font-size:.75rem;color:var(--color-text-tertiary)}.solved-check{color:var(--color-success);font-weight:700}.solved-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);background:#6b8f7126;color:var(--color-success);border-radius:var(--radius-sm);font-size:.875rem;font-weight:600;align-self:flex-start}.feedback{background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);text-align:center}.feedback.success{background:#6b8f711a;border-color:var(--color-success)}.feedback.error{background:#b85c5c1a;border-color:var(--color-error)}.feedback-icon{font-size:2.5rem;line-height:1}.feedback.success .feedback-icon{color:var(--color-success)}.feedback.error .feedback-icon{color:var(--color-error)}.feedback-text{font-size:1.125rem;font-weight:700;color:var(--color-text-primary)}.feedback-subtext{font-size:.875rem;color:var(--color-text-secondary)}.hint-box{background:#8b73551a;border:1px solid var(--color-accent);border-radius:var(--radius-lg);padding:var(--spacing-lg);display:flex;align-items:center;gap:var(--spacing-md)}.hint-icon{font-size:1.5rem;flex-shrink:0}.hint-text{font-size:.9375rem;color:var(--color-text-primary);line-height:1.5}.hint-text strong{color:var(--color-accent);font-weight:700;text-transform:uppercase}.puzzle-controls{display:flex;gap:var(--spacing-md)}.puzzle-controls .btn-secondary{flex:1;padding:var(--spacing-md);border-radius:var(--radius-md);border:1px solid var(--color-bg-tertiary);background:var(--color-surface);color:var(--color-text-primary);font-family:var(--font-sans);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all var(--transition-base);display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm)}.puzzle-controls .btn-secondary:hover:not(:disabled){background:var(--color-surface-hover);border-color:var(--color-accent);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.puzzle-controls .btn-secondary:active:not(:disabled){transform:translateY(0)}.puzzle-controls .btn-secondary:disabled{opacity:.4;cursor:not-allowed}.puzzle-navigation{display:flex;gap:var(--spacing-md)}.btn-nav{flex:1;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-md);border:1px solid var(--color-accent);background:var(--color-accent);color:#fff;font-family:var(--font-sans);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.btn-nav:hover:not(:disabled){background:var(--color-accent-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-nav:active:not(:disabled){transform:translateY(0)}.btn-nav:disabled{opacity:.3;cursor:not-allowed;transform:none}.puzzle-board-container{flex:1;display:flex;align-items:center;justify-content:center}@media(max-width:1200px){.puzzle-mode{flex-direction:column;padding:var(--spacing-lg)}.puzzle-sidebar{flex:none;width:100%;max-width:600px}.puzzle-board-container{width:100%;max-width:600px}.puzzle-board-container .chess-board-wrapper{width:100%}.puzzle-board-container .chess-board{width:100%;height:auto;aspect-ratio:1 / 1;max-width:600px}}@media(max-width:768px){.puzzle-mode{padding:var(--spacing-md)}.puzzle-sidebar{max-width:100%}.puzzle-stats{gap:var(--spacing-md)}.puzzle-controls{flex-wrap:wrap}.puzzle-controls .btn-secondary{flex:1 1 calc(50% - var(--spacing-sm))}.puzzle-board-container .chess-board{max-width:calc(100vw - 32px)}.puzzle-coach-panel{position:fixed;inset:auto 0 0;transform:none;width:100%;max-height:70vh;border-radius:var(--radius-lg) var(--radius-lg) 0 0;display:flex;flex-direction:column}.puzzle-coach-panel .coach-quick-actions{flex-shrink:0}.puzzle-coach-panel .coach-chat{flex:1;min-height:100px;max-height:none;overflow-y:auto}.puzzle-coach-panel .coach-input-area{flex-shrink:0;padding:var(--spacing-sm);padding-bottom:max(var(--spacing-sm),env(safe-area-inset-bottom))}.puzzle-extra-controls{flex-direction:column}.puzzle-browser{max-width:100%;max-height:90vh;margin:var(--spacing-md)}.browser-filters{flex-direction:column}}.teacher-mode{padding:var(--spacing-2xl);min-height:100vh;max-width:1400px;margin:0 auto}.teacher-mode.lesson-view{display:flex;gap:var(--spacing-2xl);align-items:flex-start}.teacher-header{text-align:center;margin-bottom:var(--spacing-2xl)}.teacher-header h1{font-family:var(--font-display);font-size:3rem;margin-bottom:var(--spacing-md);color:var(--color-text-primary)}.teacher-subtitle{font-size:1.125rem;color:var(--color-text-secondary);max-width:600px;margin:0 auto}.lesson-categories{display:flex;flex-direction:column;gap:var(--spacing-2xl)}.lesson-category{display:flex;flex-direction:column;gap:var(--spacing-lg)}.category-title{font-family:var(--font-display);font-size:1.75rem;color:var(--color-text-primary);padding-left:var(--spacing-sm)}.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:var(--spacing-lg)}.lesson-card{position:relative;background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md);cursor:pointer;transition:all var(--transition-base);display:flex;flex-direction:column;gap:var(--spacing-md)}.lesson-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.lesson-card.completed{border-color:var(--color-success);background:#6b8f710d}.completed-badge{position:absolute;top:var(--spacing-md);right:var(--spacing-md);width:32px;height:32px;background:var(--color-success);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}.lesson-card .difficulty-badge{align-self:flex-start}.lesson-card .lesson-title{font-size:1.125rem;font-weight:700;color:var(--color-text-primary);line-height:1.4}.lesson-card .lesson-description{font-size:.9375rem;color:var(--color-text-secondary);line-height:1.6;flex:1}.lesson-meta{display:flex;gap:var(--spacing-md);font-size:.875rem;color:var(--color-text-tertiary);padding-top:var(--spacing-sm);border-top:1px solid var(--color-bg-tertiary)}.lesson-duration,.lesson-exercises{display:flex;align-items:center;gap:var(--spacing-xs)}.progress-summary{margin-top:var(--spacing-3xl);background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-md)}.progress-summary h3{font-family:var(--font-display);font-size:1.5rem;margin-bottom:var(--spacing-lg);color:var(--color-text-primary);text-align:center}.progress-stats{display:flex;gap:var(--spacing-2xl);justify-content:center}.progress-stat{text-align:center}.progress-stat .stat-value{font-size:2.5rem;font-weight:700;color:var(--color-accent);line-height:1;margin-bottom:var(--spacing-sm)}.progress-stat .stat-label{font-size:.875rem;color:var(--color-text-secondary);font-weight:500}.lesson-sidebar{flex:0 0 480px;display:flex;flex-direction:column;gap:var(--spacing-lg)}.lesson-nav{display:flex;gap:var(--spacing-md)}.btn-back{padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-md);border:1px solid var(--color-bg-tertiary);background:var(--color-surface);color:var(--color-text-primary);font-family:var(--font-sans);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.btn-back:hover{background:var(--color-surface-hover);border-color:var(--color-accent);transform:translateY(-1px)}.lesson-info-card{background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md)}.lesson-info-card .lesson-title{font-size:1.5rem;font-weight:700;color:var(--color-text-primary);margin:var(--spacing-md) 0;line-height:1.3}.lesson-category{font-size:.875rem;font-weight:600;color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.05em}.theory-content,.exercise-content{background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-md);display:flex;flex-direction:column;gap:var(--spacing-lg)}.theory-content h3{font-size:1.25rem;font-weight:700;color:var(--color-text-primary);margin-top:var(--spacing-md)}.objectives-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:var(--spacing-sm)}.objectives-list li{padding-left:var(--spacing-lg);position:relative;color:var(--color-text-secondary);line-height:1.6}.objectives-list li:before{content:"✓";position:absolute;left:0;color:var(--color-success);font-weight:700}.theory-text{font-size:1rem;line-height:1.7;color:var(--color-text-secondary)}.btn-primary{padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-md);border:none;background:var(--color-accent);color:#fff;font-family:var(--font-sans);font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--transition-base);align-self:flex-start}.btn-primary:hover{background:var(--color-accent-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-primary.btn-large{font-size:1.125rem;padding:var(--spacing-lg) var(--spacing-2xl);align-self:stretch;margin-top:var(--spacing-lg)}.exercise-header h3{font-size:1.125rem;font-weight:700;color:var(--color-text-primary)}.exercise-progress-bar{height:8px;background:var(--color-bg-tertiary);border-radius:4px;overflow:hidden;margin-top:var(--spacing-sm)}.exercise-progress-fill{height:100%;background:linear-gradient(90deg,var(--color-accent),var(--color-accent-hover));transition:width var(--transition-slow);border-radius:4px}.exercise-task{background:var(--color-accent-light);border-left:3px solid var(--color-accent);padding:var(--spacing-lg);border-radius:var(--radius-sm)}.exercise-task h4{font-size:.875rem;font-weight:600;color:var(--color-accent);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--spacing-sm)}.exercise-task p{font-size:1rem;line-height:1.6;color:var(--color-text-primary)}.exercise-feedback{background:var(--color-surface);border:2px solid;border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md)}.exercise-feedback.success{border-color:var(--color-success);background:#6b8f711a}.exercise-feedback .feedback-icon{width:56px;height:56px;border-radius:50%;background:var(--color-success);color:#fff;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700}.exercise-feedback .feedback-title{font-size:1.5rem;font-weight:700;color:var(--color-text-primary)}.exercise-feedback .feedback-explanation{font-size:1rem;line-height:1.6;color:var(--color-text-secondary)}.exercise-controls{display:flex;gap:var(--spacing-md);flex-wrap:wrap}.exercise-controls .btn-secondary{flex:1;min-width:200px;padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-md);border:1px solid var(--color-bg-tertiary);background:var(--color-surface);color:var(--color-text-primary);font-family:var(--font-sans);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.exercise-controls .btn-secondary:hover:not(:disabled){background:var(--color-surface-hover);border-color:var(--color-accent);transform:translateY(-1px)}.exercise-controls .btn-secondary:disabled{opacity:.5;cursor:not-allowed}.coach-hints{background:#8b735514;border:1px solid var(--color-accent);border-radius:var(--radius-lg);padding:var(--spacing-lg)}.coach-hints h4{font-size:.875rem;font-weight:600;color:var(--color-accent);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--spacing-md)}.coach-messages{display:flex;flex-direction:column;gap:var(--spacing-md)}.coach-message{background:#fff;padding:var(--spacing-md);border-radius:var(--radius-sm);font-size:.9375rem;line-height:1.6;color:var(--color-text-secondary)}.lesson-board-container{flex:1;display:flex;align-items:center;justify-content:center;position:sticky;top:var(--spacing-2xl)}.lesson-coach-panel{position:fixed;top:50%;right:var(--spacing-lg);transform:translateY(-50%);width:360px;max-height:80vh;background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);display:flex;flex-direction:column;overflow:hidden;z-index:100}.lesson-coach-panel .coach-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);border-bottom:1px solid var(--color-bg-tertiary);background:linear-gradient(135deg,var(--color-sage-light) 0%,transparent 100%);flex-shrink:0}.lesson-coach-panel .coach-close-btn{background:none;border:none;font-size:1.25rem;cursor:pointer;color:var(--color-text-secondary);padding:var(--spacing-xs)}.lesson-coach-panel .coach-close-btn:hover{color:var(--color-text-primary)}.lesson-coach-panel .coach-quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-xs);padding:var(--spacing-sm);border-bottom:1px solid var(--color-bg-tertiary);flex-shrink:0}.lesson-coach-panel .coach-chat{flex:1;overflow-y:auto;padding:var(--spacing-md);min-height:150px}.lesson-coach-panel .coach-input-area{flex-shrink:0;display:flex;gap:var(--spacing-sm);padding:var(--spacing-sm);border-top:1px solid var(--color-bg-tertiary);background:var(--color-surface)}.lesson-coach-panel .coach-input{flex:1;padding:var(--spacing-sm) var(--spacing-md);background:var(--color-bg-secondary);border:1px solid transparent;border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.8125rem;color:var(--color-text-primary)}.lesson-coach-panel .coach-input:focus{outline:none;border-color:var(--color-accent)}.theory-actions{margin:var(--spacing-lg) 0}@media(max-width:1200px){.teacher-mode.lesson-view{flex-direction:column}.lesson-sidebar{flex:none;width:100%;max-width:600px;margin:0 auto}.lesson-board-container{position:static;width:100%;max-width:600px;margin:0 auto}.lesson-board-container .chess-board-wrapper{width:100%}.lesson-board-container .chess-board{width:100%;height:auto;aspect-ratio:1 / 1;max-width:600px}}@media(max-width:768px){.teacher-mode{padding:var(--spacing-lg)}.teacher-header h1{font-size:2rem}.lesson-grid{grid-template-columns:1fr}.progress-stats{flex-direction:column;gap:var(--spacing-lg)}.lesson-sidebar{max-width:100%}.lesson-board-container .chess-board{max-width:calc(100vw - 32px)}.lesson-coach-panel{position:fixed;inset:auto 0 0;transform:none;width:100%;max-height:70vh;border-radius:var(--radius-lg) var(--radius-lg) 0 0}.lesson-coach-panel .coach-chat{flex:1;min-height:100px;overflow-y:auto}.lesson-coach-panel .coach-input-area{padding-bottom:max(var(--spacing-sm),env(safe-area-inset-bottom))}}.mode-container{position:relative;min-height:100vh}.menu-btn-float{position:fixed;top:var(--spacing-lg);left:var(--spacing-lg);padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-md);border:1px solid var(--color-bg-tertiary);background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);color:var(--color-text-primary);font-family:var(--font-sans);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-lg);z-index:1000}.menu-btn-float:hover{background:var(--color-surface-hover);border-color:var(--color-accent);transform:translateY(-2px);box-shadow:var(--shadow-xl)}.mode-card-special{background:linear-gradient(135deg,#8b73550d,#a3aa9c0d);border:2px solid var(--color-accent-light)}.mode-card-special:hover{border-color:var(--color-accent);background:linear-gradient(135deg,#8b73551a,#a3aa9c1a)}.mode-card-special.selected{border-color:var(--color-accent);background:linear-gradient(135deg,#8b735526,#a3aa9c26)}@media(max-width:768px){.menu-btn-float{top:var(--spacing-md);left:var(--spacing-md);padding:var(--spacing-xs) var(--spacing-md);font-size:.875rem}}.spectator-mode{min-height:100vh;padding:var(--spacing-xl);background:var(--color-bg-primary)}.spectator-header{text-align:center;margin-bottom:var(--spacing-xl);position:relative}.spectator-header h1{font-family:var(--font-display);font-size:2.5rem;color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.spectator-subtitle{font-size:1.125rem;color:var(--color-text-secondary)}.spectator-layout{display:flex;gap:var(--spacing-xl);max-width:1600px;margin:0 auto;align-items:flex-start;justify-content:center}.commentary-panel{width:320px;background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden;max-height:700px;display:flex;flex-direction:column}.commentary-header{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:linear-gradient(135deg,rgba(201,169,98,.15) 0%,transparent 100%);border-bottom:1px solid var(--color-bg-tertiary);font-weight:600;color:var(--color-text-primary)}.commentary-icon{font-size:1.25rem}.commentary-feed{flex:1;overflow-y:auto;padding:var(--spacing-md);display:flex;flex-direction:column;gap:var(--spacing-md)}.commentary-placeholder{text-align:center;color:var(--color-text-tertiary);padding:var(--spacing-xl);font-style:italic}.commentary-item{background:var(--color-bg-secondary);border-radius:var(--radius-md);padding:var(--spacing-md);border-left:3px solid var(--color-warning)}.commentary-move-num{display:block;font-size:.75rem;font-weight:600;color:var(--color-accent);margin-bottom:var(--spacing-xs);text-transform:uppercase;letter-spacing:.05em}.commentary-item p{font-size:.9375rem;line-height:1.6;color:var(--color-text-primary);margin:0}.commentary-loading{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-text-tertiary);font-size:.875rem;padding:var(--spacing-sm)}.spectator-board-area{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md);flex-shrink:0}.spectator-board-area .board-wrapper{position:relative;width:500px;max-width:100%}.spectator-board-area .chess-board-wrapper{width:100%}.spectator-board-area .chess-board{width:100%;height:auto;aspect-ratio:1 / 1}.player-label{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);background:var(--color-surface);border-radius:var(--radius-md);font-weight:600;color:var(--color-text-primary)}.player-label.black-label{background:#3d3a351a}.player-label.white-label{background:#faf8f5cc;border:1px solid var(--color-bg-tertiary)}.engine-icon{font-size:1.25rem}.thinking-badge{background:var(--color-accent);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}.game-end-overlay{position:absolute;inset:0;background:#2c2a27e6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;z-index:20}.game-end-content{text-align:center;color:#fff;padding:var(--spacing-2xl)}.game-end-icon{font-size:4rem;margin-bottom:var(--spacing-lg)}.game-end-content h2{font-family:var(--font-display);font-size:2.5rem;margin-bottom:var(--spacing-md)}.game-end-content p{font-size:1.125rem;opacity:.8;margin-bottom:var(--spacing-xl)}.spectator-controls{display:flex;gap:var(--spacing-md);justify-content:center;flex-wrap:wrap}.spectator-controls .btn.active{background:var(--color-accent);color:#fff}.engine-error{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);background:#f8717126;border:1px solid #f87171;border-radius:var(--radius-md);color:#f87171;font-weight:500}.error-icon{font-size:1.25rem}.loading-spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite;margin-right:var(--spacing-sm)}@keyframes spin{to{transform:rotate(360deg)}}.speed-control{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-md)}.speed-control label{font-size:.875rem;font-weight:600;color:var(--color-text-secondary)}.speed-buttons{display:flex;gap:var(--spacing-xs)}.speed-btn{padding:var(--spacing-xs) var(--spacing-md);border:1px solid var(--color-bg-tertiary);background:var(--color-surface);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.75rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.speed-btn:hover{background:var(--color-bg-secondary)}.speed-btn.active{background:var(--color-accent);color:#fff;border-color:var(--color-accent)}.spectator-moves{background:var(--color-surface);border-radius:var(--radius-md);padding:var(--spacing-md);max-width:600px;width:100%}.moves-header{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-tertiary);margin-bottom:var(--spacing-sm)}.moves-list{display:flex;flex-wrap:wrap;gap:var(--spacing-xs);max-height:80px;overflow-y:auto}.moves-list .no-moves{color:var(--color-text-tertiary);font-size:.875rem}.move-notation{font-family:SF Mono,Monaco,Inconsolata,monospace;font-size:.8125rem;padding:2px 6px;border-radius:3px}.move-notation.white{background:#faf8f580}.move-notation.black{background:#3d3a3514}.move-num{color:var(--color-text-tertiary);margin-right:2px}.spectator-coach-panel{width:360px;background:var(--color-surface);-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);display:flex;flex-direction:column;max-height:700px;overflow:hidden}.spectator-coach-panel .coach-chat{flex:1;overflow-y:auto;min-height:200px;max-height:400px}.spectator-pause .pause-content{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-md)}.spectator-pause .pause-content .btn{margin-top:var(--spacing-md)}@media(max-width:1400px){.spectator-layout{flex-direction:column;align-items:center}.commentary-panel{width:100%;max-width:600px;max-height:250px;order:2}.spectator-board-area{order:1}.spectator-coach-panel{width:100%;max-width:600px;max-height:350px;order:3}}@media(max-width:768px){.spectator-mode{padding:var(--spacing-sm);padding-top:60px}.spectator-header{margin-bottom:var(--spacing-md)}.spectator-header h1{font-size:1.5rem}.spectator-subtitle{font-size:.875rem}.spectator-layout{gap:var(--spacing-md)}.spectator-board-area{width:100%;display:flex;flex-direction:column;align-items:center}.spectator-board-area .board-wrapper{width:100%;max-width:calc(100vw - 16px);position:relative}.spectator-board-area .chess-board-wrapper{width:100%;max-width:calc(100vw - 16px)}.spectator-board-area .chess-board{width:100%;height:auto;aspect-ratio:1 / 1;max-width:calc(100vw - 16px)}.player-label{padding:var(--spacing-xs) var(--spacing-sm);font-size:.75rem}.engine-icon{font-size:1rem}.thinking-badge{font-size:.625rem;padding:1px 6px}.commentary-panel{max-width:100%;max-height:200px}.commentary-header{padding:var(--spacing-sm);font-size:.875rem}.commentary-feed,.commentary-item{padding:var(--spacing-sm)}.commentary-item p{font-size:.8125rem}.spectator-coach-panel{max-width:100%;max-height:300px}.spectator-controls{flex-direction:row;flex-wrap:wrap;width:100%;gap:var(--spacing-xs)}.spectator-controls .btn{flex:1;min-width:120px;font-size:.8125rem;padding:var(--spacing-sm)}.speed-control{flex-direction:row;flex-wrap:wrap;width:100%;padding:var(--spacing-sm);gap:var(--spacing-sm)}.speed-control label{width:100%;text-align:center}.speed-buttons{width:100%;justify-content:center}.spectator-moves{max-width:100%;padding:var(--spacing-sm)}.moves-list{max-height:60px}.move-notation{font-size:.6875rem}}@media(max-width:480px){.spectator-mode{padding:var(--spacing-xs);padding-top:55px}.spectator-header h1{font-size:1.25rem}.spectator-board-area .chess-board{max-width:calc(100vw - 8px)}.spectator-controls .btn{min-width:100px;font-size:.75rem}}.difficulty-quick-select{margin-bottom:var(--spacing-lg)}.difficulty-quick-select label{display:block;font-size:.875rem;font-weight:600;color:var(--color-text-secondary);margin-bottom:var(--spacing-sm);text-transform:uppercase;letter-spacing:.05em}.difficulty-buttons{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-sm)}.difficulty-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-md);border:2px solid var(--color-bg-tertiary);background:var(--color-surface);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);font-family:var(--font-sans)}.difficulty-btn:hover{border-color:var(--color-accent);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.difficulty-btn.active{border-color:var(--color-accent);background:linear-gradient(135deg,rgba(201,169,98,.15) 0%,transparent 100%)}.difficulty-btn.beginner.active{border-color:#4ade80;background:linear-gradient(135deg,rgba(74,222,128,.15) 0%,transparent 100%)}.difficulty-btn.intermediate.active{border-color:#fbbf24;background:linear-gradient(135deg,rgba(251,191,36,.15) 0%,transparent 100%)}.difficulty-btn.advanced.active{border-color:#f87171;background:linear-gradient(135deg,rgba(248,113,113,.15) 0%,transparent 100%)}.diff-label{font-size:.9375rem;font-weight:600;color:var(--color-text-primary);margin-bottom:2px}.diff-count{font-size:.75rem;color:var(--color-text-tertiary)}.player-turn-indicator{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);font-weight:600;font-size:.9375rem;margin-top:var(--spacing-md)}.player-turn-indicator.white-to-play{background:linear-gradient(135deg,#faf8f5e6,#faf8f5b3);border:1px solid var(--color-bg-tertiary);color:#3d3a35}.player-turn-indicator.black-to-play{background:linear-gradient(135deg,#3d3a35e6,#3d3a35b3);color:#faf8f5}.turn-dot-large{width:16px;height:16px;border-radius:50%;flex-shrink:0}.white-to-play .turn-dot-large{background:#faf8f5;border:2px solid #3d3a35}.black-to-play .turn-dot-large{background:#3d3a35;border:2px solid #faf8f5}@media(max-width:768px){.difficulty-buttons{grid-template-columns:repeat(2,1fr)}.difficulty-btn{padding:var(--spacing-sm)}.diff-label{font-size:.8125rem}}.coach-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);background:linear-gradient(135deg,rgba(201,169,98,.15) 0%,transparent 100%);border-bottom:1px solid 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