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

body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f8ff; /* soft blue background */
  color: #333;
  line-height: 1.6;
}

/* Container styling */
.container {
  max-width: 720px;
  margin: 3rem auto;
  background: #ffffff;
  padding: 2rem 2.5rem;
  border-radius: 16px;
  box-shadow: 0 12px 32px rgba(0, 123, 255, 0.1);
}

/* Header */
h1 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 2rem;
  color: #0066cc;
}

/* Form layout */
form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Label and input styling */
.form-group label {
  font-weight: 600;
  margin-bottom: 0.4rem;
  display: block;
  color: #004080;
}

input {
  padding: 0.8rem;
  border: 1px solid #cce0ff;
  border-radius: 8px;
  font-size: 1rem;
  transition: border 0.3s ease-in-out;
}

input:focus {
  outline: none;
  border-color: #3399ff;
  box-shadow: 0 0 6px rgba(51, 153, 255, 0.3);
}

/* Button styling */
button {
  background-color: #007bff;
  color: #fff;
  border: none;
  padding: 0.9rem;
  font-size: 1.05rem;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #005ecb;
}

/* Summary section */
#summary {
  margin-top: 2rem;
  font-size: 1.1rem;
  font-weight: 500;
  color: #003366;
  text-align: center;
}

/* Chart styling */
canvas {
  margin-top: 2rem;
  width: 100% !important;
  height: auto !important;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 123, 255, 0.08);
}