/* Reset default margins/padding */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #6a11cb, #c51919); /* Purple → Blue gradient */
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

/* Header Section */
header {
  text-align: center;
  color: #fff;
  margin: 30px 0 20px;
  animation: fadeIn 1s ease-in-out;
}

header h1 {
  font-size: 36px;
  margin-bottom: 10px;
}

header p {
  font-size: 18px;
  opacity: 0.9;
}

/* Main Container */
.container {
  background: #fff;
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
  text-align: center;
  max-width: 420px;
  width: 90%;
  animation: slideUp 1s ease-in-out;
}

.container h2 {
  margin-bottom: 15px;
  color: #333;
  font-size: 22px;
  font-weight: bold;
}

/* Input field */
input {
  padding: 12px;
  width: 100%;
  margin: 12px 0;
  border: 2px solid #2575fc;
  border-radius: 8px;
  outline: none;
  transition: 0.3s;
}

input:focus {
  border-color: #6a11cb;
  box-shadow: 0 0 8px rgba(106,17,203,0.4);
}

/* Button */
button {
  padding: 12px;
  background: #2575fc;
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  font-size: 16px;
  font-weight: bold;
  transition: 0.3s;
}

button:hover {
  background: #6a11cb;
  transform: scale(1.05);
}

/* Result text */
#result {
  display: block;
  margin-top: 18px;
  font-size: 20px;
  font-weight: bold;
  color: #333;
  transition: 0.3s;
}

/* Info Section */
.info {
  margin: 30px auto;
  background: rgba(255,255,255,0.9);
  padding: 20px;
  border-radius: 10px;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}

.info h3 {
  margin-bottom: 10px;
  color: #2575fc;
}

.info ul {
  list-style: none;
  padding: 0;
}

.info li {
  margin: 8px 0;
  font-size: 16px;
  color: #444;
}

/* Footer */
footer {
  text-align: center;
  color: #fff;
  margin: 20px 0;
  font-size: 14px;
  opacity: 0.9;
}

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive tweaks */
@media (max-width: 480px) {
  header h1 {
    font-size: 28px;
  }
  header p {
    font-size: 16px;
  }
  .container {
    padding: 20px;
  }
  .info {
    padding: 15px;
  }
}