body {
    font-family: Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    padding: 20px;
    margin: 0;
}

h1 {
    text-align: center;
    color: #444;
    margin-bottom: 30px;
}

.controls-container {
    text-align: center;
    margin-bottom: 30px;
}

.dimension-selector {
    display: inline-block;
    background-color: #fff;
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.dimension-selector label {
    font-weight: bold;
    color: #444;
    margin-right: 10px;
}

.dimension-selector select {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
    background-color: white;
    cursor: pointer;
    transition: border-color 0.2s;
}

.dimension-selector select:hover {
    border-color: #007bff;
}

.dimension-selector select:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.puzzle-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.puzzle-card {
    background-color: #fff;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    position: relative;
}

.puzzle-table {
    border-collapse: collapse;
    margin: 0 auto;
    width: 100%;
}

.puzzle-table td {
    border: 1px solid #ccc;
    width: 30px;
    height: 30px;
    text-align: center;
    font-size: 0.9em;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

.puzzle-table td:hover {
    background-color: #f0f8ff;
}

.puzzle-table td.selected {
    background-color: #a2e8c2;
}

.puzzle-table td.correct {
    background-color: #90EE90;
}

.puzzle-table td.incorrect {
    background-color: #FFB6C1;
}
.puzzle-table td.solution-highlight {
    background-color: #FFD700;
    border: 2px solid #FFA500;
}

.product-cell {
    background-color: #e8f4f8;
    font-style: italic;
    color: #0056b3;
    cursor: default;
    font-size: 0.8em;
}

.product-cell.product-correct {
    background-color: #d4edda;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.product-cell:hover {
    background-color: #e8f4f8;
}

.product-cell.product-correct:hover {
    background-color: #d4edda;
}

.corner-cell {
    border: none;
    background-color: transparent;
    cursor: default;
}

.corner-cell:hover {
    background-color: transparent;
}


.button-container {
    display: flex;
    gap: 5px;
    justify-content: center;
    margin-top: 10px;
    flex-wrap: wrap;
}

button {
    padding: 4px 8px;
    font-size: 0.7em;
    cursor: pointer;
    border: none;
    border-radius: 3px;
    transition: background-color 0.2s;
}

.check-btn {
    background-color: #28a745;
    color: white;
}

.check-btn:hover {
    background-color: #218838;
}

.show-solution-btn {
    background-color: #007bff;
    color: white;
}

.show-solution-btn:hover {
    background-color: #0056b3;
}

.close-solution-btn {
    background-color: #6c757d;
    color: white;
}

.close-solution-btn:hover {
    background-color: #545b62;
}

.reset-btn {
    background-color: #ffc107;
    color: #212529;
}

.reset-btn:hover {
    background-color: #e0a800;
}

button:disabled {
    background-color: #6c757d !important;
    color: #fff !important;
    cursor: not-allowed !important;
    opacity: 0.6;
}

button:disabled:hover {
    background-color: #6c757d !important;
}

.result-message {
    margin-top: 5px;
    padding: 5px;
    border-radius: 3px;
    font-weight: bold;
    font-size: 0.7em;
}

.result-correct {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.result-incorrect {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.new-boards-container {
    text-align: center;
    margin-top: 30px;
}

.new-boards-btn {
    background-color: #17a2b8;
    color: white;
    padding: 12px 24px;
    font-size: 1.1em;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.new-boards-btn:hover {
    background-color: #138496;
}

/* Responsive grid adjustments */
@media (max-width: 1000px) {
    .puzzle-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
}

@media (max-width: 768px) {
    .puzzle-container {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 0 10px;
    }
    
    .puzzle-card {
        padding: 12px;
    }
    
    .controls-container {
        margin-bottom: 20px;
    }
    
    .dimension-selector {
        padding: 12px 16px;
    }
    
    .dimension-selector select {
        font-size: 0.9em;
        padding: 6px 10px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.8em;
        margin-bottom: 20px;
    }
    
    .puzzle-container {
        gap: 10px;
        padding: 0 5px;
    }
    
    .puzzle-card {
        padding: 10px;
    }
    
    .puzzle-card h3 {
        font-size: 1.1em;
        margin-bottom: 10px;
    }
    
    .button-container {
        gap: 3px;
        margin-top: 8px;
    }
    
    button {
        padding: 3px 6px;
        font-size: 0.65em;
    }
    
    .new-boards-btn {
        padding: 10px 20px;
        font-size: 1em;
    }
}

/* Adjust puzzle card size for different board dimensions */
.puzzle-card[data-dimension="3"] .puzzle-table td {
    width: 35px;
    height: 35px;
    font-size: 1.125em; /* 18px - increased by 2 points */
}

.puzzle-card[data-dimension="4"] .puzzle-table td {
    width: 30px;
    height: 30px;
    font-size: 1.025em; /* 16.4px - increased by 2 points */
}

.puzzle-card[data-dimension="5"] .puzzle-table td {
    width: 25px;
    height: 25px;
    font-size: 0.925em; /* 14.8px - increased by 2 points */
}

.puzzle-card[data-dimension="6"] .puzzle-table td {
    width: 22px;
    height: 22px;
    font-size: 0.825em; /* 13.2px - increased by 2 points */
}