*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #1976d2;--secondary-color: #424242;--success-color: #4caf50;--warning-color: #ff9800;--error-color: #f44336;--background-color: #f5f5f5;--card-background: #ffffff;--text-primary: #212121;--text-secondary: #757575;--border-color: #e0e0e0}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-color:var(--background-color);color:var(--text-primary)}.app{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:20px}.header{background-color:var(--primary-color);color:#fff;padding:15px 20px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 4px #0000001a}.header h1{font-size:1.5rem}.header-nav{display:flex;gap:20px;align-items:center}.header-nav a{color:#fff;text-decoration:none;padding:8px 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