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

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f5f7fa;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  width: 100%;
  max-width: 500px;
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #2c3e50;
  font-size: 1.6rem;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
  color: #34495e;
}

input {
  width: 100%;
  padding: 10px;
  margin-top: 6px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
}

button {
  margin-top: 20px;
  width: 100%;
  padding: 12px;
  font-size: 1rem;
  font-weight: bold;
  background: #3498db;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #2980b9;
}

.result {
  margin-top: 25px;
  padding: 15px;
  background: #ecf0f1;
  border-radius: 8px;
}

.result h2 {
  margin-bottom: 10px;
  color: #2c3e50;
}

.line {
  border-top: 1px solid #ccc;
  margin: 10px 0;
}

/* 📱 Responsive */
@media (max-width: 600px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 15px;
  }

  h1 {
    font-size: 1.3rem;
  }

  button {
    font-size: 0.95rem;
  }
}