*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #008080;--primary-dark: #006666;--primary-light: #00a3a3;--secondary-color: #f0f8f8;--text-dark: #2c3e50;--text-light: #7f8c8d;--white: #ffffff;--error: #e74c3c;--success: #27ae60;--border-color: #e0e0e0;--shadow: 0 2px 10px rgba(0, 128, 128, .1);--shadow-hover: 0 4px 20px rgba(0, 128, 128, .15)}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;color:var(--text-dark);line-height:1.6}.app{min-height:100vh;display:flex;flex-direction:column}.header{background-color:var(--white);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.header-container{max-width:1200px;margin:0 auto;padding:1rem 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