body,html{background:#f2f2f2;font-family:Segoe UI,sans-serif;margin:0;min-height:100vh;padding:0}body{align-items:center;box-sizing:border-box;display:flex;justify-content:center;padding:40px 20px}.calculator{background:#fff;border-radius:16px;box-shadow:0 6px 24px rgba(0,0,0,.08);max-width:600px;padding:40px;width:100%}h1{color:#222;font-size:26px;text-align:center}.form-group,h1{margin-bottom:30px}label{color:#333;display:block;font-weight:600;margin-bottom:10px}input[type=number],input[type=range]{border:1px solid #ccc;border-radius:8px;box-sizing:border-box;font-size:16px;padding:14px;width:100%}.slider-label{color:#666;font-size:14px;font-weight:500;margin-top:10px;text-align:right}.btn{background-color:#0069d9;border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:16px;font-weight:700;padding:16px;transition:background .3s ease;width:100%}.btn:hover{background-color:#0051ad}.result{background:#e8f4ea;border:1px solid #b3dfc2;border-radius:10px;color:#2d6a4f;font-size:18px;font-weight:600;margin-top:30px;padding:20px}