:root{--color-primary: #2ecc71;--color-primary-dark: #228b22;--color-secondary: #1abc9c;--color-secondary-dark: #16a085;--color-accent: #e76f51;--color-accent-dark: #d65a4f;--color-light: #f8f8f8;--color-light-dark: #2c3e50;--color-dark: #34495e;--color-dark-light: #ecf0f1;--color-success: #2ecc71;--color-success-dark: #27ae60;--color-error: #e74c3c;--color-error-dark: #c0392b;--color-warning: #f39c12;--color-warning-dark: #e67e22;--color-info: #3498db;--color-info-dark: #2980b9;--color-bg: #f0f0f0;--color-bg-dark: #1a1a1a;--color-text: #333;--color-text-dark: #f0f0f0;--color-border: #ddd;--color-border-dark: #34495e;--color-shadow: rgba(0, 0, 0, .1);--color-shadow-dark: rgba(0, 0, 0, .2);--color-link: #0066cc;--color-link-hover: #004999;--color-link-active: #1abc9c;--color-link-active-dark: #16a085;--color-link-dark: #1abc9c;--color-link-hover-dark: #16a085;--radius: 8px;--transition: .3s ease}body{background-color:var(--color-bg);color:var(--color-text);transition:background-color 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a{width:100%;text-align:center;padding:.5rem 0}.menu-right{width:100%;justify-content:space-between}.theme-toggle{font-size:1.25rem}}@media screen and (max-width: 480px){.site-header{padding:.5rem 1rem}.logo{font-size:1.1rem}.nav-links a{font-size:.9rem;padding:.5rem}.theme-toggle{font-size:1rem;padding:.4rem .8rem}.calculator{max-width:90%;margin:2rem auto;padding:1.5rem}.calculator h1{font-size:1.5rem}.calculator input,.calculator select{font-size:.9rem;padding:.5rem}.estimate-button{font-size:.9rem;padding:.4rem .8rem}.result,.explanation{font-size:.9rem;padding:.8rem}.about h1{font-size:2rem}.about p{font-size:1rem}.site-footer{font-size:.8rem}.site-footer a{font-size:.9rem}}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.5;font-weight:400;letter-spacing:.01em;color-scheme:light 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