body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    margin: 0;
    padding: 20px;
}

h1 {
    color: #0056b3;
    text-align: center;
}

h3 {
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

.group-selection {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background-color: #e9f5ff;
    border-radius: 8px;
    border: 1px solid #bce0fd;
}

.group-selection div {
    margin-bottom: 15px;
}

.group-selection label {
    font-size: 1.1em;
    margin-right: 10px;
}

.group-selection select {
    padding: 8px;
    font-size: 1em;
    border-radius: 5px;
    border: 1px solid #ccc;
}

#current-group-display {
    color: #0056b3;
    margin-top: 15px;
    margin-bottom: 20px;
    font-size: 1.4em;
}

#reset-data-button {
    background-color: #dc3545;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 0.9em;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#reset-data-button:hover {
    background-color: #c82333;
}

.experiment {
    margin-bottom: 40px;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
}

.table-container {
    overflow-x: auto;
    margin-bottom: 20px;
}

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

th, td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: center;
    vertical-align: middle;
}

th {
    background-color: #007bff;
    color: white;
}

td input[type="number"] {
    width: 90%;
    padding: 8px;
    font-size: 1em;
    font-family: inherit;
    text-align: center;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: #f0f8ff;
    -moz-appearance: textfield; /* Firefox */
}

td input[type="number"]::-webkit-outer-spin-button,
td input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

/* === 已更新此部分以增大图表 === */
.chart-container {
    width: 100%;
    max-width: 1100px; /* 从 800px 增加到 1100px */
    height: 500px;    /* 新增一个固定的高度 */
    margin: 20px auto;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}