:root{--color-primary: #667eea;--color-secondary: #764ba2;--color-text: #1a1a1a;--color-text-light: #6b7280;--color-border: #e5e7eb;--color-bg: #ffffff;--color-bg-alt: #f9fafb}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.5;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{margin:0;font-weight:700;line-height:1.2}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.75rem}h4{font-size:1.5rem}h5{font-size:1.25rem}h6{font-size:1rem}p{margin:0 0 1rem}a{color:var(--color-primary);text-decoration:none;transition:color .3s}a:hover{color:var(--color-secondary)}button,.button{font-family:inherit;cursor:pointer;border:none;outline:none}input,select,textarea{font-family:inherit;font-size:1rem;padding:.75rem 1rem;border:2px solid var(--color-border);border-radius:8px;width:100%;transition:border-color .3s}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-primary)}label{display:block;font-weight:600;margin-bottom:.5rem;color:var(--color-text)}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.text-center{text-align:center}.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.5rem}.mt-4{margin-top:2rem}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}.mb-4{margin-bottom:2rem}.calculator-form{background:#fff;border:2px solid var(--color-border);border-radius:12px;padding:2rem;margin-bottom:2rem}.form-group{margin-bottom:1.5rem}.results-card{background:var(--color-bg-alt);border:2px solid var(--color-border);border-radius:12px;padding:2rem}.result-item{display:flex;justify-content:space-between;padding:1rem 0;border-bottom:1px solid var(--color-border)}.result-item:last-child{border-bottom:none}.result-item .label{font-weight:600;color:var(--color-text-light)}.result-item .value{font-weight:700;font-size:1.125rem;color:var(--color-text)}@media (max-width: 768px){h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}.calculator-form,.results-card{padding:1.5rem}}