body {
  font-family: "Segoe UI", sans-serif;
  background-color: #fafafa;
  color: #1a1a1a;
  margin: 0;
  padding: 0;
  text-align: center;
}

.container {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}

.header-logo {
  width: 130px;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.header-subtitle {
  color: #555;
  font-weight: 600;
}

.intro-text {
  margin: 15px 0 25px;
}

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

input[type="text"], input[type="number"] {
  width: 200px;
  padding: 6px 8px;
  border: 1px solid #ccc;
  border-radius: 6px;
  text-align: center;
}

button {
  background-color: #007bff;
  color: white;
  border: none;
  padding: 8px 14px;
  margin-left: 5px;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background-color: #0069d9;
}

.calc-button {
  margin-top: 15px;
  background-color: #28a745;
}

.calc-button:hover {
  background-color: #218838;
}

.chart-section {
  margin-top: 25px;
}

.charts {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
}

canvas {
  max-width: 300px;
}

.ad-banner {
  margin-top: 30px;
}

footer {
  margin-top: 40px;
  color: #666;
  font-size: 0.9rem;
}

hr {
  border: 0.5px solid #eee;
  margin: 20px 0;
}