*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #2563eb;--success-color: #10b981;--warning-color: #f59e0b;--error-color: #ef4444;--bg-color: #f8fafc;--card-bg: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--border-color: #e2e8f0;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05)}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-color);color:var(--text-primary);line-height:1.6}.app{min-height:100vh;display:flex;flex-direction:column}.navbar{background-color:var(--card-bg);border-bottom:1px solid var(--border-color);padding:1rem 0;box-shadow:var(--shadow)}.navbar .container{display:flex;justify-content:space-between;align-items:center}.navbar h1{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.github-link{color:var(--text-primary);transition:color .3s ease;display:flex;align-items:center}.github-link:hover{color:var(--primary-color)}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem;width:100%}.main-content{flex:1;padding:3rem 0}.hero-section{text-align:center;margin-bottom:3rem}.hero-section h2{font-size:2rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem;line-height:1.3}.hero-section p{font-size:1.125rem;color:var(--text-secondary)}.calculator-card{max-width:500px;margin:0 auto;background-color:var(--card-bg);border-radius:1rem;padding:2rem;box-shadow:var(--shadow-lg);border:1px solid var(--border-color)}.input-group{margin-bottom:1.5rem}.input-group label{display:block;font-weight:600;margin-bottom:.5rem;color:var(--text-primary);font-size:.875rem;text-transform:uppercase;letter-spacing:.05em}.input-field{width:100%;padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:.5rem;font-size:1rem;transition:all .3s ease;background-color:var(--card-bg);color:var(--text-primary)}.input-field:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #2563eb1a}.select-field{cursor:pointer;font-weight:600}.calculate-btn{width:100%;padding:1rem;background-color:var(--text-primary);color:#fff;border:none;border-radius:.5rem;font-size:1.125rem;font-weight:600;cursor:pointer;transition:all .3s ease;margin-top:.5rem}.calculate-btn:hover{background-color:#1e293b;transform:translateY(-2px);box-shadow:var(--shadow-lg)}.calculate-btn:active{transform:translateY(0)}.result-card{margin-top:2rem;padding:1.5rem;border-radius:.75rem;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.result-card.success{background-color:#d1fae5;border:2px solid var(--success-color)}.result-card.warning{background-color:#fef3c7;border:2px solid var(--warning-color)}.result-card.error{background-color:#fee2e2;border:2px solid var(--error-color)}.result-message{font-size:1.125rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem}.result-submessage{font-size:1rem;color:var(--text-secondary)}.footer{background-color:var(--card-bg);border-top:1px solid var(--border-color);padding:2rem 0;text-align:center}.footer p{color:var(--text-secondary);font-size:.875rem}.footer a{color:var(--primary-color);text-decoration:none;font-weight:600;transition:color .3s ease}.footer a:hover{color:#1d4ed8}@media(max-width:768px){.navbar h1{font-size:1.25rem}.hero-section h2{font-size:1.5rem}.hero-section p{font-size:1rem}.calculator-card{padding:1.5rem}.main-content{padding:2rem 0}}@media(max-width:480px){.container{padding:0 1rem}.hero-section h2{font-size:1.25rem}.calculator-card{padding:1.25rem}}