.fila {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 1rem;
}

body>header {
  -webkit-box-shadow: 0px 0px 10px 2px rgba(0, 0, 0, 0.15);
  box-shadow: 0px 0px 10px 2px rgba(0, 0, 0, 0.15);
}

#pvol-header {
  margin-bottom: 2rem;
}

#pvol-header h1 {
  font-size: 30px;
  font-weight: 700;
  text-align: center;
  padding: 3rem 0;
  margin: 0 auto;
}

#pvol-main {
  padding: 0 0 30px;
}

#pvol-main .container-fluid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 20px;
}

.articulo h2,
.calculadora h2 {
  font-size: 25px;
  font-weight: 700;
  margin: 0 0 1rem;
  display: block;
}

.calculadora h2 {
  text-align: left;
}

.articulo {
  border: 1px solid #ccc;
  border-radius: 5px;
  padding: 20px;
}

.calculadora {
  padding: 20px;
  border-radius: 5px;
  border: 1px solid #ccc;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.18);
  box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.18);
  -webkit-box-ordinal-group: 0;
  -ms-flex-order: -1;
  order: -1;
  background-color: #f4f4f4;
}

.calculadora figure {
  width: 33%;
  margin: 0;
  -webkit-box-ordinal-group: 3;
  -ms-flex-order: 2;
  order: 2;
}

.calculadora figure img {
  width: 100%;
}

.calc-box {
  width: 65%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
}

.calc-box .input-group {
  width: 49%;
  margin-bottom: .5rem;
}

.calc-box .input-group input::-webkit-input-placeholder {
  font-size: 12px;
}

.calc-box .input-group-text {
  font-size: 12px;
  background-color: #f4f4f4;
}

#calc-pv-btn {
  background-color: #ff6600;
  border: 2px solid #ff6600;
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  padding: .5rem 2rem;
  display: inline-block;
  margin-bottom: 1rem;
  width: 100%;
  text-align: center;
  border-radius: 5px;
  -webkit-transition: all .2s ease;
  transition: all .2s ease;
}

#calc-pv-btn:hover {
  background-color: #fff;
  border: 2px solid #ff6600;
  text-decoration: none;
  color: #ff6600;
}

.pv-result {
  margin-top: -1rem;
  margin-bottom: 0;
}

#resultado {
  text-align: right;
  font-size: 30px;
  width: 60%;
  border: 0;
  background-color: #f4f4f4;
}

.articulo02 ol {
  margin: 0;
  padding: 0;
  list-style-type: none;
}

.articulo02 ol li {
  counter-increment: step-counter;
  margin-bottom: 10px;
  position: relative;
  padding-left: 30px;
}

.articulo02 ol li:before {
  content: counter(step-counter);
  background-color: #ff6600;
  color: #fff;
  font-weight: 700;
  padding: 5px;
  height: 25px;
  border-radius: 5px;
  position: absolute;
  left: 0;
  width: 25px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.articulo02 figure {
  margin: 2rem auto 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  justify-content: space-between;
}
.articulo02 figure img {
  max-width: 30%;
  width: 30%;
  height: 100%;
  max-height: 100%; 
}

.articulo03 ul {
  margin-bottom: 0;
  list-style: none;
  padding: 0;
}

.articulo03 ul li {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: start;
  -ms-flex-align: start;
  align-items: flex-start;
  margin-bottom: 10px;
}

.articulo03 ul li:before {
  content: '';
  margin-top: 3px;
  width: 15px;
  min-width: 15px;
  height: 15px;
  min-height: 15px;
  background-color: #ff6600;
  border-radius: 50%;
  margin-right: 5px;
}
@media(max-width:1200px){
  #resultado {
    width: 52%;
  }
}

@media(max-width:1024px) {
  #pvol-header {
    margin-bottom: 0;
  }
  .pv-result label{
    display: block;
    border-bottom: 1px solid #ccc;
    margin-top: 5px;
  }
  .pv-result span{
    display: inline-block;
    width: 20px;
  }
  #resultado{
    width: calc(100% - 25px);
  }
  .articulo02 figure img{
    max-width: 33%;
    width: 32%;
  }
}

@media(max-width:768px) {
  #pvol-header {
    margin-bottom: 20px;
  }
  .calculadora{
    grid-column: 1/3;
  }
  .pv-result{
    width: 100%;
    border-bottom: 1px solid #ccc;
  }
  .pv-result label {
    width: 140px;
    display: inline-block;
    border: 0;
    margin-bottom: 0;
  }
  #resultado {
    width: calc(100% - 175px);
  }
  .articulo02{
    grid-column: 1/3;
    order: -1;
  }
}

@media(max-width:576px) {
  p,
  li{
    font-size: 14px;
  }
  #pvol-header h1 {
    font-size: 25px;
  }
  .articulo{
    grid-column: 1/3;
  }
  .articulo h2, .calculadora h2 {
    font-size: 22px;
  }
  .calculadora{
    order:0;
  }
  .articulo01{
    order:1;
  }
  .articulo02{
    order:2;
  }
  .articulo03{
    order:3;
  }

}

@media(max-width:425px) {
  #pvol-header h1 {
    padding: 30px 0;
    font-size: 25px;
  }
  #pvol-header {
    margin-bottom: 30px;
  }
  #pvol-header p,
  .articulo p {
    text-align: justify;
  }
  .calc-box {
    width: 100%;
    padding-top: 1rem;
    order:2;
  }
  .pv-result label {
    display: block;
    border-bottom: 1px solid #ccc;
    margin-bottom: 0;
    width: 100%;
  }
  #resultado {
    width: calc(100% - 25px);
  }
  .pv-result {
    border-bottom:0;
  }
  .calculadora figure {
    width: 100%;
    height: 150px;
    text-align: center;
  }
  .calculadora figure img {
    height: 100%;
    width: auto;
  }
  .articulo02 figure {
    margin: 1rem auto 0;
    flex-wrap: wrap;
  }
  .articulo02 figure img {
    max-width: 100%;
    width: 75%;
    margin: 0 auto 20px;
  }
  .articulo02 figure img:last-of-type {
    margin: 0 auto;
  }
}

@media(max-width:375px) {
  .calculadora figure{
    display: none;
  }
  .calc-box{
    padding-top: 0;
  }
  .articulo h2, .calculadora h2 {
    font-size: 20px;
    text-align: left;
  }
  .articulo p:last-of-type{
    margin-bottom: 0;
  }
  .articulo02 ol {
    margin-top: 10px;
  }
  .articulo02 figure img {
    width: 85%;
  }
}

@media(max-width:320px) {
  #pvol-header h1 {
    font-size: 22px;
  }
  .calculadora{
    padding: 15px;
  }
  .calc-box .input-group{
    width: 100%;
  }
  .articulo h2, .calculadora h2 {
    font-size: 18px;
  }
  #calc-pv-btn{
    padding: 0.5rem;
  }
  .articulo02 figure img {
    width: 100%;
  }
}