body {
  background-color: #0d1a26;
  color: #e9e9e9;
  font-family: "Verdana", sans-serif;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

#math-machine {
  background: rgba(20, 30, 40, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 30px;
  width: 90%;
  max-width: 450px;
}

h1 {
  color: #79ddff;
  text-align: center;
  margin-bottom: 25px;
}

label {
  display: block;
  margin-top: 15px;
  margin-bottom: 5px;
  font-size: 0.95em;
  color: #b3ccff;
}

select,
input[type="text"] {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  border: 1px solid #4a6fa5;
  border-radius: 8px;
  background-color: #1a2a3a;
  color: #e9e9e9;
  box-sizing: border-box;
}

select:focus,
input[type="text"]:focus {
  border-color: #79ddff;
  outline: none;
}

#stuff-go-here {
  padding: 15px;
  border: 1px dashed #4a6fa5;
  border-radius: 10px;
  margin-bottom: 20px;
}

button {
  width: 100%;
  padding: 12px;
  background-color: #79ddff;
  color: #0d1a26;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
}

#final-check {
  margin-top: 25px;
  padding: 15px;
  background-color: #2a3a4a;
  border-radius: 10px;
  font-size: 1.1em;
  text-align: center;
  min-height: 20px;
}

#final-check strong {
  color: #ffd86d;
}

#math-machine a {
  text-decoration: none;
  color: #b3ccff;
}

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

footer {
  text-align: center;
  border-top: 1px solid #171717;
  bottom: 0;
  left: 49%;
  position: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50px;
}