body {
    font-family: 'Amiri', serif;
    background-color: #eef2f3;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

#input-excel {
    display: block;
    margin: 0 auto 20px auto;
}

.stage-list {
    margin-bottom: 20px;
    text-align: center;
}

.stage-button {
    display: inline-block;
    margin: 5px;
    padding: 10px 15px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.stage-button:hover {
    background-color: #45a049;
}

.column-selection {
    margin-bottom: 20px;
    text-align: center;
}

.column-selection label {
    margin-right: 15px;
    font-size: 16px;
}

#student-table-container {
    margin-top: 20px;
    overflow-x: auto;
}

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

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

th {
    background-color: #f2f2f2;
}

.export-buttons {
    text-align: center;
    margin-top: 20px;
}

.export-buttons button {
    margin: 0 10px;
    padding: 12px 20px;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.export-buttons button:disabled {
    background-color: #a0c4f3;
    cursor: not-allowed;
}

.export-buttons button:hover:not(:disabled) {
    background-color: #0b7dda;
}