:root {
  background-color: #ecf5ff;
  font-size: 62.5%;
}
* {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  color: #333;
}
h1,
h2,
h3,
h4 {
  margin-bottom: 1rem;
}
p {
  margin-bottom: 1rem;
}
h1 {
  background: linear-gradient(to right, rgb(0, 211, 226), #28a9ff);
  border: 1px solid rgb(255, 215, 112);
  text-shadow: 6px 3px 2px rgba(27, 204, 248, 0.2);
  box-shadow: 2px 0 0 5px rgba(0, 0, 0, 0.2);
  font-size: 5.4rem;
  color: #000000;
  margin-bottom: 5rem;
}
h1 > span {
  font-size: 4.2rem;
  font-weight: 500;
}
h2 {
  font-size: 4.2rem;
  margin-bottom: 4rem;
  font-weight: 700;
}
h3 {
  font-size: 7.8rem;
  font-weight: 500;
}
.container {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 80rem;
  margin: 0 auto;
  padding: 2rem;
}
.container > * {
  width: 100%;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.flex-center {
  justify-content: center;
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.text-center {
  text-align: center;
}

.hidden {
  display: none;
}
/*Buttons */
.btn {
  background: linear-gradient(to right, rgb(0, 211, 226), #28a9ff);
  color: rgb(0, 0, 0);
  --width: 20rem;
  --height: calc(var(--width) / 3);
  width: var(--width);
  height: var(--height);
  text-align: center;
  line-height: var(--height);
  font-size: calc(var(--height) / 2.5);
  letter-spacing: 0.2em;
  border: 1px solid rgb(255, 215, 112);
  transform: perspective(500px) rotateY(-15deg);
  text-shadow: 6px 3px 2px rgba(27, 204, 248, 0.2);
  box-shadow: 2px 0 0 5px rgba(0, 0, 0, 0.2);
  transition: 0.5s;
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
}

.btn:hover {
  cursor: pointer;
  transform: perspective(500px) rotateX(15deg);
  text-shadow: -6px 3px 2px rgba(0, 0, 0, 0.2);
  box-shadow: -2px 0 0 5px rgba(0, 0, 0, 0.2);
}

.btn::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, transparent, white, transparent);
  left: -100%;
  transition: 0.5s;
}

.btn:hover::before {
  left: 100%;
}
.btn[disabled]:hover {
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/*form */
form {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}
input {
  margin-bottom: 3rem;
  width: 20rem;
  padding: 1.5rem;
  border: none;
  font-size: 1.8rem;
  box-shadow: 0 0.1rem 1.4rem rgba(86, 185, 235, 0.5);
}
input::placeholder {
  color: #aaa;
}