styles.css

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to right, #a2c2e4, #f5f5f5);
  color: #333;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  text-align: center;
}

h1 {
  color: #2c3e50;
  font-size: 2.5em;
  margin-bottom: 20px;
  font-weight: 700;
  animation: fadeIn 1s ease-out;
}

form {
  background: #ffffff;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  max-width: 500px;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 400px;
  animation: slideIn 1s ease-out;
}

form:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.form-title {
  margin-bottom: 20px;
}

label {
  display: block;
  margin: 15px  15px;
  font-weight: 630;
  font-size: 1.1em;
}

select,
input[type="number"] {
  width: calc(100% - 24px);
  padding: 12px;
  margin: 5px 0 15px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s ease;
}

select:focus,
input[type="number"]:focus {
  border-color: #4a90e2;
  outline: none;
}

button {
  background: #4a90e2;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 25px;
  font-size: 18px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s ease;
  animation: bounceIn 1s ease-out;
}

button:hover {
  background: #357abd;
  transform: scale(1.05);
}

.result {
  font-style: bold;
  font-size: 1.2em;
  font-weight: 700;
  color: #333;
  margin-top: 20px;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounceIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}