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ease}.logout-btn:hover{background:#e74c3c;color:#fff;transform:translateY(-1px)}.app-header h1{color:var(--text-primary);margin-bottom:var(--spacing-xs);background:linear-gradient(135deg,#646cff,#48cae4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:var(--text-secondary);font-size:1rem;margin:0}.app-nav{display:flex;justify-content:center;gap:var(--spacing-sm);margin-top:var(--spacing-md)}.nav-btn{padding:var(--spacing-sm) var(--spacing-lg);border:2px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;background-color:transparent;color:var(--text-primary)}.nav-btn:hover{border-color:var(--primary-color);color:var(--primary-color);transform:translateY(-2px)}.nav-btn.active{background:linear-gradient(135deg,var(--primary-color) 0%,var(--primary-hover) 100%);color:#fff;border-color:var(--primary-color)}.app-main{flex:1;padding:var(--spacing-lg) var(--spacing-md);width:100%;overflow-x:hidden}.app-footer{background-color:var(--background-dark);padding:var(--spacing-md);text-align:center;border-top:2px solid var(--border-color);color:var(--text-secondary);font-size:.9rem}.app-footer p{margin:0}.hello-world-container{width:100%;max-width:700px;margin:0 auto}.hello-world-card{background:var(--card-background);border-radius:var(--radius-lg);padding:var(--spacing-xl);box-shadow:var(--shadow-lg);border:1px solid var(--border-color);transition:transform .3s ease,box-shadow .3s ease}.hello-world-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-glow)}.hello-title{text-align:center;font-size:3rem;margin-bottom:var(--spacing-lg);background:linear-gradient(135deg,#646cff,#48cae4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.8}}.time-display{display:flex;justify-content:center;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:#ffffff0d;border-radius:var(--radius-md);margin-bottom:var(--spacing-lg);border:1px solid rgba(255,255,255,.1)}.time-label{color:var(--text-secondary);font-weight:500}.time-value{font-family:Courier New,Courier,monospace;font-size:1.5rem;font-weight:600;color:var(--secondary-color);letter-spacing:.05em}.counter-section{margin:var(--spacing-lg) 0;text-align:center}.counter-section h3{color:var(--text-primary);margin-bottom:var(--spacing-md)}.counter-display{margin:var(--spacing-md) 0;padding:var(--spacing-lg);background:#ffffff0d;border-radius:var(--radius-md);border:2px solid var(--primary-color)}.counter-value{font-size:4rem;font-weight:700;color:var(--primary-color);font-family:Courier New,Courier,monospace;text-shadow:0 0 20px rgba(100,108,255,.5)}.button-group{display:flex;gap:var(--spacing-sm);justify-content:center;flex-wrap:wrap;margin-top:var(--spacing-md)}.btn{padding:var(--spacing-sm) var(--spacing-lg);border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;text-transform:uppercase;letter-spacing:.5px;box-shadow:var(--shadow-md)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--primary-color) 0%,var(--primary-hover) 100%);color:#fff}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-glow)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:linear-gradient(135deg,#f87171,#ef4444);color:#fff}.btn-secondary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 0 20px #f871714d}.btn-secondary:active:not(:disabled){transform:translateY(0)}.info-section{margin-top:var(--spacing-lg);padding:var(--spacing-md);background:#ffffff08;border-radius:var(--radius-md);border-left:4px solid var(--secondary-color)}.info-text{color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.feature-list{list-style:none;padding-left:0}.feature-list li{padding:var(--spacing-xs) 0;color:var(--text-secondary);display:flex;align-items:center}.feature-list li:before{content:"✓";color:var(--success-color);font-weight:700;margin-right:var(--spacing-sm);font-size:1.2rem}.feature-list strong{color:var(--primary-color);margin-right:.3rem}@media (max-width: 768px){.app-header h1,.hello-title{font-size:2rem}.counter-value{font-size:3rem}.time-value{font-size:1.2rem}.hello-world-card{padding:var(--spacing-md)}.button-group{flex-direction:column}.btn{width:100%}}:root{--primary-color: #646cff;--primary-hover: #535bf2;--secondary-color: #48cae4;--background-dark: #1a1a2e;--background-light: #16213e;--card-background: #0f3460;--text-primary: #ffffff;--text-secondary: #b0b0b0;--border-color: #2a2a4e;--success-color: #4ade80;--danger-color: #f87171;--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem;--spacing-xl: 3rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: 1rem;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .3);--shadow-glow: 0 0 20px rgba(100, 108, 255, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,var(--background-dark) 0%,var(--background-light) 100%);color:var(--text-primary);min-height:100vh;line-height:1.6}#root{width:100%;min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:var(--spacing-sm)}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.5rem}a{color:var(--primary-color);text-decoration:none;transition:color .2s ease}a:hover{color:var(--primary-hover)}code{font-family:Courier New,Courier,monospace;background-color:#ffffff1a;padding:.2rem .4rem;border-radius:var(--radius-sm);font-size:.9em}.text-center{text-align:center}.mt-1{margin-top:var(--spacing-sm)}.mt-2{margin-top:var(--spacing-md)}.mt-3{margin-top:var(--spacing-lg)}.mb-1{margin-bottom:var(--spacing-sm)}.mb-2{margin-bottom:var(--spacing-md)}.mb-3{margin-bottom:var(--spacing-lg)}