:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #34495e;
    --gray-color: #7f8c8d;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px;
    text-align: center;
    border-radius: 8px 8px 0 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1 {
    margin: 0;
    font-size: 1.8rem;
}

.calculator {
    background-color: white;
    border-radius: 0 0 8px 8px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--dark-color);
}

input[type="number"] {
    width: 80%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 1.1rem;
    transition: border-color 0.3s;
    margin: 10 auto;
    display: block;
}

input[type="number"]:focus {
    border-color: var(--primary-color);
    outline: none;
}

.select-wrapper {
    position: relative;
    width: 100%;
}

select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 4px;
    font-size: 1.1rem;
    appearance: none;
    background-color: white;
    transition: border-color 0.3s;
}

select:focus {
    border-color: var(--primary-color);
    outline: none;
}

.select-wrapper:after {
    content: '▼';
    position: absolute;
    right: 15px;
    top: 12px;
    color: var(--gray-color);
    pointer-events: none;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 12px 20px;
    font-size: 1.1rem;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--secondary-color);
}

.results {
    margin-top: 20px;
    display: none;
}

.results.active {
    display: block;
    animation: fadeIn 0.5s;
}

.recommendation {
    background-color: #e8f4fd;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 15px;
    border-left: 4px solid var(--primary-color);
}

.photo-visualization {
    margin-top: 30px;
    position: relative;
    overflow-x: auto;
}

.photo-row {
    display: flex;
    justify-content: center;
    margin-bottom: 15px;
}

.student {
    width: 30px;
    height: 30px;
    background-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 2px;
    position: relative;
}

.student:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 10px;
    width: 10px;
    height: 5px;
    background-color: rgba(0,0,0,0.1);
    border-radius: 0 0 5px 5px;
}

.row-indicator {
    display: flex;
    justify-content: space-between;
    margin: 15px 0;
    font-weight: bold;
}

.row-indicator span {
    padding: 5px 10px;
    background-color: var(--light-color);
    border-radius: 4px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 12px;
    text-align: center;
}

th {
    background-color: var(--primary-color);
    color: white;
}

tr:nth-child(even) {
    background-color: #f2f2f2;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .student {
        width: 20px;
        height: 20px;
    }
    
    .student:after {
        left: 5px;
        width: 10px;
    }
}