@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap";.tic-tac-toe{display:flex;flex-direction:column;align-items:center;gap:1rem}.status{font-size:1.2rem;font-weight:700;margin-bottom:1rem}.board{display:grid;grid-template-columns:repeat(3,100px);grid-template-rows:repeat(3,100px);gap:4px;background-color:#333;padding:4px;border-radius:8px}.square{background-color:#1a1a1a;border:none;font-size:2.5rem;font-weight:700;cursor:pointer;transition:background-color .2s;border-radius:4px}.square:hover:not(:disabled){background-color:#2a2a2a}.square:disabled{cursor:not-allowed;opacity:.8}.reset-button{margin-top:1rem}.snake-game{display:flex;flex-direction:column;align-items:center;gap:1rem}.game-info{text-align:center}.score{font-size:1.5rem;font-weight:700;margin:.5rem 0;color:#646cff}.game-over,.paused{font-size:1.2rem;font-weight:700;margin-top:.5rem;color:#ff6b6b}.paused{color:orange}.game-board{display:grid;grid-template-columns:repeat(20,15px);grid-template-rows:repeat(20,15px);gap:1px;background-color:#333;padding:4px;border-radius:4px}.cell{width:15px;height:15px;background-color:#1a1a1a;border-radius:2px}.cell.snake{background-color:#646cff}.cell.head{background-color:#535bf2;border:1px solid #fff}.cell.food{background-color:#ff6b6b;border-radius:50%}.game-controls{display:flex;gap:1rem}.instructions{text-align:center;font-size:.9rem;color:#aaa;margin-top:.5rem}.instructions p{margin:.25rem 0}:root{--primary-color: #1A365D;--primary-hover: #2D3748;--secondary-color: #0D9488;--secondary-hover: #0F766E;--accent-color: #FF6B6B;--accent-hover: #FA5252;--bg-color: #F8FAFC;--surface-color: #FFFFFF;--text-primary: #1E293B;--text-secondary: #64748B;--border-color: #E2E8F0;--border-hover: #CBD5E1;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s cubic-bezier(.4, 0, .2, 1);--z-base: 1;--z-elevated: 10;--z-overlay: 100;--z-modal: 1000}.shift4-game-container{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:linear-gradient(135deg,var(--bg-color) 0%,#E0E7FF 100%);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:var(--spacing-lg);color:var(--text-primary)}.shift4-screen{background-color:var(--surface-color);padding:var(--spacing-2xl);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);text-align:center;max-width:640px;width:100%;border:1px solid var(--border-color);animation:fadeInScale .4s cubic-bezier(.16,1,.3,1)}@keyframes fadeInScale{0%{opacity:0;transform:scale(.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.shift4-btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);font-size:1rem;font-weight:600;font-family:inherit;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-sm);position:relative;overflow:hidden;background-color:var(--primary-color);color:#fff}.shift4-btn:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#fff3;transform:translate(-50%,-50%);transition:width .6s,height .6s}.shift4-btn:hover{background-color:var(--primary-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.shift4-btn:hover:before{width:300px;height:300px}.shift4-btn:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.shift4-btn.primary{background:linear-gradient(135deg,var(--secondary-color) 0%,var(--secondary-hover) 100%)}.shift4-btn.primary:hover{background:linear-gradient(135deg,var(--secondary-hover) 0%,var(--secondary-color) 100%)}.shift4-btn.accent{background:linear-gradient(135deg,var(--accent-color) 0%,var(--accent-hover) 100%)}.shift4-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.form-group{margin-bottom:var(--spacing-lg);text-align:left}.form-group label{display:block;margin-bottom:var(--spacing-sm);font-weight:600;color:var(--text-primary);font-size:.875rem;text-transform:uppercase;letter-spacing:.05em}.form-group input{width:100%;padding:var(--spacing-md);font-family:inherit;border:2px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;transition:all var(--transition-base);background-color:var(--surface-color);color:var(--text-primary)}.form-group input:focus{outline:none;border-color:var(--secondary-color);box-shadow:0 0 0 3px #0d94881a}.form-group input::placeholder{color:var(--text-secondary);opacity:.6}.start-screen{max-width:560px}.start-hero{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.game-logo{width:120px;height:120px;animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:scale(1.05)}}.logo-icon{width:100%;height:100%;filter:drop-shadow(0 4px 8px rgba(0,0,0,.1))}.game-title{font-size:3.5rem;font-weight:700;margin:0;background:linear-gradient(135deg,var(--secondary-color) 0%,var(--primary-color) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.02em}.game-tagline{font-size:1.125rem;color:var(--text-secondary);margin:0;font-weight:400}.feature-pills{display:flex;gap:var(--spacing-sm);flex-wrap:wrap;justify-content:center}.pill{display:inline-block;padding:var(--spacing-xs) var(--spacing-md);background-color:#0d94881a;color:var(--secondary-color);border-radius:9999px;font-size:.875rem;font-weight:600;border:1px solid rgba(13,148,136,.2)}.start-btn{margin-top:var(--spacing-md);padding:var(--spacing-lg) var(--spacing-2xl);font-size:1.125rem}.hint-text{font-size:.875rem;color:var(--text-secondary);margin:0}@media (max-width: 480px){.game-title{font-size:2.5rem}.game-logo{width:80px;height:80px}.start-btn{width:100%}}.player-info-screen{max-width:540px}.screen-header{margin-bottom:var(--spacing-2xl);position:relative}.back-icon{position:absolute;left:0;top:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-md);transition:all var(--transition-base)}.back-icon:hover{background-color:var(--bg-color);color:var(--text-primary)}.screen-title{font-size:2rem;font-weight:700;margin:0 0 var(--spacing-xs) 0;color:var(--text-primary)}.screen-subtitle{font-size:1rem;color:var(--text-secondary);margin:0}.player-form{display:flex;flex-direction:column;gap:var(--spacing-lg)}.player-card{display:flex;align-items:center;gap:var(--spacing-lg);padding:var(--spacing-lg);border:2px solid var(--border-color);border-radius:var(--radius-lg);background:linear-gradient(135deg,#0d948808,#1a365d08);transition:all var(--transition-base)}.player-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-sm)}.player-card.player-one{border-left:4px solid var(--secondary-color)}.player-card.player-two{border-left:4px solid var(--accent-color)}.player-badge{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.25rem;color:#fff;flex-shrink:0}.player-one .player-badge{background:linear-gradient(135deg,var(--secondary-color),var(--secondary-hover));box-shadow:0 2px 8px #0d94884d}.player-two .player-badge{background:linear-gradient(135deg,var(--accent-color),var(--accent-hover));box-shadow:0 2px 8px #ff6b6b4d}.badge-label{display:block}.player-details{flex:1;text-align:left}.player-label{display:block;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-sm);font-size:1rem}.symbol-indicator{display:inline-block;margin-left:var(--spacing-sm);font-size:.875rem;color:var(--text-secondary);font-weight:400}.player-input{width:100%;padding:var(--spacing-md);border:2px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;transition:all var(--transition-base);background-color:#fff;color:#1a1a1a;box-sizing:border-box}.player-input:focus{outline:none;border-color:var(--secondary-color);box-shadow:0 0 0 3px #0d94881a}.vs-divider{display:flex;align-items:center;justify-content:center;position:relative;height:40px}.vs-divider:before{content:"";position:absolute;left:0;right:0;top:50%;height:2px;background:linear-gradient(90deg,transparent 0%,var(--border-color) 20%,var(--border-color) 80%,transparent 100%)}.vs-text{position:relative;z-index:1;background:#fff;padding:0 var(--spacing-md);font-weight:700;color:var(--text-secondary);font-size:.875rem;letter-spacing:.1em}.submit-btn{margin-top:var(--spacing-md);padding:var(--spacing-lg) var(--spacing-2xl);font-size:1.125rem}@media (max-width:480px){.player-card{flex-direction:column;text-align:center;padding:var(--spacing-md)}.player-details{width:100%;text-align:center}.player-label{text-align:center}.player-input{max-width:100%;font-size:16px}}.game-screen{max-width:720px;padding:var(--spacing-xl)}.game-header{display:grid;grid-template-columns:1fr auto 1fr;gap:var(--spacing-lg);align-items:center;margin-bottom:var(--spacing-xl);padding:var(--spacing-lg);background:linear-gradient(135deg,#0d94880d,#1a365d0d);border-radius:var(--radius-lg);border:1px solid var(--border-color)}.score-card{display:flex;align-items:center;gap:var(--spacing-md)}.player-two-score{justify-content:flex-end}.score-icon{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem;color:#fff;flex-shrink:0}.player-one-score .score-icon{background:linear-gradient(135deg,var(--secondary-color),var(--secondary-hover));box-shadow:0 2px 8px #0d94884d}.player-two-score .score-icon{background:linear-gradient(135deg,var(--accent-color),var(--accent-hover));box-shadow:0 2px 8px #ff6b6b4d}.score-details{display:flex;flex-direction:column;gap:var(--spacing-xs)}.player-two-score .score-details{text-align:right}.player-name{font-weight:600;color:var(--text-primary);font-size:1rem}.score-value{font-size:.875rem;color:var(--text-secondary)}.round-indicator{text-align:center}.round-badge{display:inline-block;padding:var(--spacing-sm) var(--spacing-lg);background:linear-gradient(135deg,var(--primary-color),var(--primary-hover));color:#fff;border-radius:9999px;font-weight:600;font-size:.875rem;box-shadow:var(--shadow-sm)}.turn-status{display:flex;justify-content:center;margin-bottom:var(--spacing-xl)}.turn-badge{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-lg);border:2px solid;animation:pulseGlow 2s ease-in-out infinite}.turn-badge.player-one{background:#0d94881a;border-color:var(--secondary-color);color:var(--secondary-hover)}.turn-badge.player-two{background:#ff6b6b1a;border-color:var(--accent-color);color:var(--accent-hover)}@keyframes pulseGlow{0%,to{box-shadow:0 0 0 0 currentColor;opacity:1}50%{box-shadow:0 0 0 4px transparent;opacity:.9}}.turn-symbol{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:currentColor;color:#fff;font-weight:700;font-size:1rem}.turn-text{font-weight:600;font-size:1.125rem}.winner-container{margin-bottom:var(--spacing-xl);padding:var(--spacing-xl);background:linear-gradient(135deg,#0d94881a,#ffd7001a);border-radius:var(--radius-xl);border:2px solid rgba(13,148,136,.3);animation:celebrate .6s ease-out}@keyframes celebrate{0%{transform:scale(.9);opacity:0}50%{transform:scale(1.02)}to{transform:scale(1);opacity:1}}.winner-content{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.trophy-icon{width:72px;height:72px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,gold,orange);color:#fff;box-shadow:0 4px 16px #ffd70066;animation:bounce 1s ease-in-out infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.winner-title{font-size:1.75rem;font-weight:700;color:var(--text-primary);margin:0}.board-container{display:flex;justify-content:center;margin-bottom:var(--spacing-xl)}.board-wrapper{display:inline-block;padding:var(--spacing-lg);background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);border:1px solid var(--border-color)}.board-row{display:flex}.cell{width:72px;height:72px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border-color);position:relative;transition:all var(--transition-base);-webkit-user-select:none;user-select:none}.board-cell{background:linear-gradient(135deg,#fafafa,#f5f5f5);cursor:pointer;font-size:2rem;font-weight:700}.board-cell:hover{background:linear-gradient(135deg,var(--bg-color) 0%,#E8F4F8 100%);border-color:var(--secondary-color);transform:scale(1.05);z-index:var(--z-elevated);box-shadow:var(--shadow-md)}.board-cell.occupied{cursor:not-allowed;background:#fff}.board-cell.occupied:hover{transform:none;border-color:var(--border-color);box-shadow:none}.symbol{animation:symbolPop .3s cubic-bezier(.68,-.55,.265,1.55);display:inline-block}@keyframes symbolPop{0%{transform:scale(0) rotate(-180deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}.symbol-x{color:var(--secondary-color)}.symbol-o{color:var(--accent-color)}.header{background:linear-gradient(135deg,#f8fafc,#e2e8f0);cursor:pointer;font-weight:600;color:var(--text-secondary)}.header:hover{background:linear-gradient(135deg,#e2e8f0,#cbd5e1);color:var(--text-primary)}.header.selected{background:linear-gradient(135deg,var(--secondary-color),var(--secondary-hover));color:#fff;box-shadow:0 0 0 3px #0d948833;z-index:var(--z-elevated)}.header-corner{background:linear-gradient(135deg,var(--primary-color),var(--primary-hover));color:#fff;cursor:default;font-size:1.25rem}.header-content{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs)}.header-label{font-size:1rem;font-weight:700}.selection-arrow{color:#fff;animation:bounce 1s ease-in-out infinite}.game-instructions{display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-lg);background:#0d94880d;border-radius:var(--radius-lg);border:1px solid rgba(13,148,136,.1)}.instruction-item{display:flex;align-items:flex-start;gap:var(--spacing-md)}.instruction-icon{width:40px;height:40px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:#fff;border-radius:var(--radius-md);color:var(--secondary-color);border:1px solid var(--border-color)}.instruction-text{flex:1;color:var(--text-secondary);font-size:.875rem;line-height:1.6;padding-top:var(--spacing-sm)}.instruction-text strong{color:var(--text-primary);font-weight:600}@media (max-width: 768px){.game-header{grid-template-columns:1fr;gap:var(--spacing-md);text-align:center}.score-card{justify-content:center}.player-two-score{flex-direction:row-reverse}.player-two-score .score-details{text-align:left}}@media (max-width: 640px){.cell{width:68px;height:68px;font-size:1.625rem}}@media (max-width: 480px){.game-screen{padding:var(--spacing-md)}.cell{width:72px;height:72px;font-size:1.75rem}.board-wrapper,.game-instructions{padding:var(--spacing-md)}.instruction-item{flex-direction:column;align-items:center;text-align:center}}.loading-spinner{width:40px;height:40px;border:4px solid var(--border-color);border-top-color:var(--secondary-color);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-lg);padding:var(--spacing-2xl)}.loading-text{color:var(--text-secondary);font-size:.875rem}.shift4-btn:focus-visible,.player-input:focus-visible,.header:focus-visible{outline:2px solid var(--secondary-color);outline-offset:2px}.board-cell:focus-visible{outline:3px solid var(--secondary-color);outline-offset:-3px;z-index:var(--z-elevated)}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media (prefers-color-scheme: dark){:root{--bg-color: #0F172A;--surface-color: #1E293B;--text-primary: #F1F5F9;--text-secondary: #94A3B8;--border-color: #334155;--border-hover: #475569}.shift4-game-container{background:linear-gradient(135deg,var(--bg-color) 0%,#1E293B 100%)}.board-cell{background:linear-gradient(135deg,#334155,#2a3547)}.board-cell:hover{background:linear-gradient(135deg,#475569,#3a4557)}}.app{min-height:100vh;display:flex;flex-direction:column}.nav{background-color:#1a1a1a;padding:1rem 2rem;border-bottom:1px solid #333;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.nav h1{margin:0;font-size:1.5rem}.nav-links{display:flex;gap:1rem;flex-wrap:wrap}.nav-links a{padding:.5rem 1rem;border-radius:4px;transition:background-color .2s}.nav-links a:hover{background-color:#333}.nav-links a.active{background-color:#646cff;color:#fff}.main-content{flex:1;padding:2rem;max-width:1200px;width:100%;margin:0 auto}.home{text-align:center}.home h2{margin-bottom:1rem}.game-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1.5rem;margin-top:2rem}.game-card{padding:1.5rem;border:1px solid #333;border-radius:8px;background-color:#1a1a1a;transition:transform .2s,box-shadow .2s;text-decoration:none;color:inherit;display:block}.game-card:hover{transform:translateY(-4px);box-shadow:0 4px 12px #646cff4d}.game-card h3{margin:0 0 .5rem;color:#646cff}.game-card p{margin:0;color:#aaa;font-size:.9rem}.not-found{text-align:center;padding:2rem}.not-found h2{margin-bottom:1rem;color:#ff6b6b}.not-found a{display:inline-block;margin-top:1rem}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}#root{width:100%;margin:0 auto;text-align:center}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}