@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;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 check-pulse{0%,to{background:var(--color-square-check)}50%{background:#b85c5ca6}}.coord-rank,.coord-file{position:absolute;font-size:10px;font-weight:600;opacity:.5;pointer-events:none;-webkit-user-select:none;user-select:none}.coord-rank{top:4px;left:4px}.coord-file{bottom:4px;right:4px}.square.light .coord-rank,.square.light .coord-file{color:var(--color-square-dark)}.square.dark .coord-rank,.square.dark .coord-file{color:var(--color-square-light)}.legal-move-indicator{position:absolute;width:28%;height:28%;border-radius:50%;background:var(--color-square-legal);pointer-events:none}.legal-move-indicator.capture{width:90%;height:90%;background:transparent;border:5px solid var(--color-square-legal)}.piece-wrapper{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;width:100%;height:100%;pointer-events:none}.piece-wrapper svg{max-width:85%;max-height:85%}.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 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-icon{font-size:1.25rem}.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)}.quick-action-btn:disabled{opacity:.5;cursor:not-allowed}.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}.chat-message.user{flex-direction:row-reverse}.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}.chat-message.user .message-content{background:var(--color-accent);color:#fff;border-bottom-right-radius:4px}.chat-message.assistant .message-content{background:var(--color-bg-secondary);color:var(--color-text-primary);border-bottom-left-radius:4px}.typing-indicator{display:flex;gap:4px;padding:var(--spacing-xs) 0}.typing-indicator span{width:6px;height:6px;border-radius:50%;background:var(--color-text-tertiary);animation:typing 1.4s ease-in-out infinite}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@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 var(--spacing-sm);background:#b85c5c1a;border-radius:var(--radius-sm);font-size:.75rem;color:var(--color-error)}.coach-input-area{display:flex;gap:var(--spacing-sm);padding:var(--spacing-sm);border-top:1px solid var(--color-bg-tertiary)}.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);transition:all var(--transition-fast)}.coach-input:focus{outline:none;border-color:var(--color-accent);background:var(--color-surface-elevated)}.coach-input::placeholder{color:var(--color-text-tertiary)}.coach-send-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--color-accent);border:none;border-radius:var(--radius-sm);color:#fff;cursor:pointer;transition:all var(--transition-fast)}.coach-send-btn:hover:not(:disabled){background:var(--color-accent-hover)}.coach-send-btn:disabled{opacity:.5;cursor:not-allowed}.coach-send-btn svg{width:16px;height:16px}.clear-history-btn{display:block;width:100%;padding:var(--spacing-sm);background:transparent;border:none;font-family:var(--font-sans);font-size:.75rem;color:var(--color-text-tertiary);cursor:pointer;transition:color var(--transition-fast)}.clear-history-btn:hover{color:var(--color-text-secondary)}@media(max-width:1200px){.game-layout.with-coach{flex-direction:column;align-items:center}.game-layout.with-coach .side-panels{width:600px;flex-direction:row;max-height:none}.game-layout.with-coach .game-panel{flex:1;max-height:none}.game-layout.with-coach .coach-panel{flex:1;max-height:400px}}@media(max-width:1100px){.game-layout{flex-direction:column;align-items:center}.side-panels{width:600px;max-height:none}.game-panel{width:100%;height:auto;flex-direction:row;flex-wrap:wrap;gap:var(--spacing-md)}.player-card{flex:1;min-width:200px}.game-status{width:100%;order:-1}.move-history{flex:none;width:100%;max-height:150px}.controls,.coach-toggle-btn{width:100%}.coach-panel{width:100%;max-height:350px}.game-layout.with-coach .side-panels{flex-direction:column;width:600px}}@media(max-width:680px){.game-container{padding:var(--spacing-md)}.chess-board{width:calc(100vw - 32px);height:calc(100vw - 32px);max-width:400px;max-height:400px}.side-panels{width:100%;max-width:calc(100vw - 32px)}.game-panel{width:100%}.player-card{min-width:140px}.move-history{max-height:120px}.coach-panel{max-height:300px}.coach-chat{min-height:100px}.mode-options{grid-template-columns:1fr}.start-screen{padding:var(--spacing-md)}.logo-section h1{font-size:2.5rem}.difficulty-options,.time-options{flex-wrap:wrap}.difficulty-btn,.time-btn{flex:1 1 calc(50% - var(--spacing-xs));min-width:100px}.modal{padding:var(--spacing-lg);margin:var(--spacing-md);max-width:calc(100vw - 32px)}.promotion-pieces{gap:var(--spacing-sm)}.promotion-piece-btn{width:60px;height:60px}}@media(max-width:400px){.chess-board{width:calc(100vw - 24px);height:calc(100vw - 24px)}.player-card{flex-direction:column;align-items:flex-start;gap:var(--spacing-sm)}.timer{width:100%}.quick-action-btn{font-size:.6875rem;padding:var(--spacing-xs)}.coach-quick-actions{grid-template-columns:repeat(4,1fr)}.quick-action-btn span:last-child{display:none}}@media(hover:none)and (pointer:coarse){.square{-webkit-tap-highlight-color:transparent}.control-btn,.quick-action-btn,.menu-option,.mode-card,.difficulty-btn,.time-btn{min-height:44px}.coach-input{font-size:16px}}