body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f7fa;
}

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

.container {
    background-color: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 25px;
}

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

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

input[type="number"],
select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    display: block;
    width: 100%;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #2980b9;
}

.results {
    display: none;
    margin-top: 20px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.stats-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
}

.stat-box {
    flex: 1;
    min-width: 200px;
    background-color: white;
    padding: 15px;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.stat-box h3 {
    margin-top: 0;
    color: #2c3e50;
    font-size: 16px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: #3498db;
    margin: 10px 0;
}

.explanation {
    background-color: #ebf5fb;
    padding: 15px;
    border-radius: 6px;
    margin: 20px 0;
}

.chart-container {
    width: 100%;
    height: 400px;
    margin-top: 30px;
}

.note {
    font-style: italic;
    color: #7f8c8d;
    margin-top: 10px;
}

.percentile {
    font-size: 28px;
    color: #e74c3c;
    text-align: center;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th,
td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f2f2f2;
    font-weight: 600;
}

tr:hover {
    background-color: #f9f9f9;
}

.warning-box {
  background-color: #fff3cd;
  border: 1px solid #ffeeba;
  color: #856404;
  padding: 10px 15px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 15px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}