* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #4facfe, #00c6ff);
  margin: 0;
  padding: 15px;
  color: #222;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 550px;
  margin: 25px auto;
  background: rgba(255,255,255,0.85);
  padding: 25px;
  border-radius: 18px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

header {
  text-align: center;
  margin-bottom: 25px;
}

h1 {
  font-size: 38px;
  margin-bottom: 10px;
  line-height: 1.3;
}

header p {
  font-size: 18px;
  color: #444;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
}

input {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
}

input:focus {
  outline: none;
  border-color: #4facfe;
  box-shadow: 0 0 8px rgba(79, 172, 254, 0.4);
}

button {
  display: block;
  width: 100%;
  margin-top: 20px;
  padding: 14px;
  border: none;
  border-radius: 10px;
  background: #28a745;
  color: white;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s ease;
}

button:hover {
  opacity: 0.95;
  transform: translateY(-2px);
}

#result {
  text-align: center;
  margin-top: 25px;
}

h2 {
  margin-top: 35px;
}

ul {
  line-height: 1.8;
}

footer {
  margin-top: 40px;
}

hr {
  margin: 40px 0;
  border: none;
  border-top: 1px solid #ddd;
}

/* Mobile Responsive */
@media (max-width: 768px) {

  body {
    padding: 8px;
  }

  .container {
    width: 100%;
    padding: 18px;
    margin: 15px auto;
  }

  h1 {
    font-size: 30px;
  }

  header p {
    font-size: 16px;
  }

  input,
  button {
    font-size: 16px;
  }
}