:root{--primary-color: #a51c24;--background-color: white;--text-color: #333;--highlight-color: #f6f6f6}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;padding:20px}.container{max-width:1200px;margin:0 auto;padding:20px}header{background-color:var(--primary-color);color:#fff;padding:15px 20px;text-align:center;font-size:1.5rem;font-weight:700;border-radius:8px}footer{background-color:var(--primary-color);color:#fff;text-align:center;padding:10px;margin-top:20px;font-size:1rem;border-radius:8px}button,a{background-color:var(--primary-color);color:#fff;padding:10px 15px;border:none;border-radius:6px;text-decoration:none;cursor:pointer;font-size:1rem}button:hover,a:hover{background-color:var(--highlight-color);color:var(--primary-color)}input[type=number],select,textarea{padding:10px;border:1px solid #ccc;border-radius:6px;margin:10px 0;width:100%;font-size:1rem;outline:none}input[type=number]:focus,select:focus,textarea:focus{border-color:var(--primary-color)}.toggle-buttons{display:flex;justify-content:center;gap:12px;margin:20px 0}.toggle-buttons button{padding:10px 20px;font-size:1rem;border:2px solid #ccc;background-color:#fff;color:#333;border-radius:8px;cursor:pointer;transition:all .3s ease-in-out}.toggle-buttons button:hover{border-color:var(--primary-color);background-color:#fef2f2;color:var(--primary-color)}.toggle-buttons button.active{background-color:var(--highlight-color);color:var(--primary-color);border-color:var(--primary-color);font-weight:700}.input-card{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-end;background-color:#fcfcfc;padding:20px;border-radius:10px;border:1px solid #ddd;margin-bottom:15px}.input-group{flex:1 1 200px;min-width:150px}.input-group label{display:block;font-weight:500;margin-bottom:6px;color:#444}.input-card button{background-color:#eee;color:#444;padding:8px 12px;font-size:.9rem;border:1px solid #ccc;border-radius:6px;transition:all .3s ease}.input-card button:hover{background-color:#fce8e9;color:var(--primary-color);border-color:var(--primary-color)}.calculator-section{background-color:#fff;border:1px solid #eaeaea;padding:25px;border-radius:12px;margin-top:20px;box-shadow:0 2px 10px #0000000d}.calculator-section h2{font-size:1.4rem;margin-bottom:20px;color:var(--primary-color);text-align:center}.calculator-section button{margin-right:10px;margin-top:10px}.calculator-section h3{margin-top:20px;font-size:1.2rem;color:var(--text-color);text-align:center}.calculator-section h3 span{color:var(--primary-color);font-weight:700}.error-message{background-color:#f8d7da;color:#721c24;padding:10px;border-radius:6px;margin-bottom:20px}.navbar{background-color:var(--primary-color);padding:15px 20px;display:flex;gap:20px;justify-content:center;align-items:center;border-radius:0;margin-bottom:20px;box-shadow:0 4px 10px #0000000d}.navbar a{color:#fff;text-decoration:none;font-size:1rem;font-weight:500;padding:8px 16px;border-radius:0;transition:background-color .3s ease}.navbar a:hover{background-color:var(--highlight-color);color:var(--primary-color)}