#road-coloring-app {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        background-color: white; 
        color: #333;
        margin: 0;
        padding: 0;
        display: flex;
        justify-content: center;
        align-items: flex-start;
        min-height: 100vh;
    }

    #road-coloring-app .container {
        max-width: 800px;
        width: 100%;
        margin: 0 auto;
        padding: 20px;
        background: white;
    }

    #road-coloring-app h1 {
        font-size: 24px;
        margin-bottom: 20px;
        text-align: center;
        color: #2c3e50;
    }

    #road-coloring-app select {
        width: 100%;
        padding: 10px 15px;
        border-radius: 6px;
        border: 1px solid #ccc;
        font-size: 16px;
        margin-bottom: 20px;
        box-sizing: border-box;
        transition: border-color 0.3s ease;
    }

    #road-coloring-app select:focus {
        outline: none;
        border-color: #0d6efd;
        box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.25);
    }

    #road-coloring-app #error {
        height: 24px;
        margin: 10px 0;
        font-weight: bold;
        text-align: center;
        color: #dc3545;
    }

    #road-coloring-app canvas {
        display: block;
        margin: 0 auto;
        border: 1px solid #ddd;
        background-color: #fff;
        box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    }

    #road-coloring-app .theory {
        background-color: white;
        padding: 15px;
        border-radius: 8px;
        margin-bottom: 20px;
    }
    
    #road-coloring-app .theory h2 {
        font-size: 18px;
        margin-top: 0;
        color: #2c3e50;
    }
    
    #road-coloring-app .instructions {
        background-color: #e9f5ff;
        padding: 15px;
        border-radius: 8px;
        margin-bottom: 20px;
        cursor: pointer;
    }
    
    #road-coloring-app .instructions h2 {
        font-size: 18px;
        margin-top: 0;
        color: #0d6efd;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    #road-coloring-app .instructions-content {
        display: none;
        margin-top: 10px;
    }
    
    #road-coloring-app .instructions.active .instructions-content {
        display: block;
    }

    #road-coloring-app #syncCheck {
        margin-top: 30px;
    }

    #road-coloring-app #syncCheck p {
        font-size: 16px;
        margin-bottom: 10px;
    }

    #road-coloring-app #syncInput {
        width: 100%;
        padding: 10px 15px;
        font-size: 16px;
        border: 1px solid #ccc;
        border-radius: 6px;
        margin-bottom: 10px;
        box-sizing: border-box;
        transition: border-color 0.3s ease;
    }

    #road-coloring-app #syncInput:focus {
        outline: none;
        border-color: #198754;
        box-shadow: 0 0 0 3px rgba(25, 135, 84, 0.25);
    }

    #road-coloring-app button {
        background-color: #0d6efd;
        color: white;
        border: none;
        padding: 10px 20px;
        font-size: 16px;
        border-radius: 6px;
        cursor: pointer;
        transition: background-color 0.3s ease;
    }

    #road-coloring-app button:hover {
        background-color: #0b5ed7;
    }

    #road-coloring-app #syncResult,
#road-coloring-app #syncRoutes {
        margin-top: 15px;
        padding: 10px;
        border-left: 4px solid #198754;
        background-color: #f0f8f5;
        font-size: 15px;
    }

    #road-coloring-app #syncResult span[style*="red"] {
        border-left: 4px solid #dc3545;
        background-color: #fff5f5;
        padding: 10px;
        display: block;
    }
    

@media (max-width: 768px) {
    #road-coloring-app {
        align-items: flex-start;
        padding-top: 10px;
    }

    #road-coloring-app .container {
        max-width: 100%;
        width: 100%;
        padding: 10px;
        overflow-x: hidden;
    }

    #road-coloring-app h1 {
        font-size: 20px;
        margin-bottom: 15px;
    }

    #road-coloring-app #graphCanvas {
        width: 100%;
        height: 300px;
        max-height: 40vh;
        margin: 10px auto;
    }

    #road-coloring-app .theory,
#road-coloring-app .instructions {
        font-size: 14px;
        padding: 10px;
    }

    #road-coloring-app select {
        font-size: 14px;
        padding: 8px;
    }

    #road-coloring-app #syncInputBlock {
        display: block !important;
        width: 100%;
    }

    #road-coloring-app #syncInput {
        width: 100%;
        box-sizing: border-box;
        margin-top: 5px;
    }

    #road-coloring-app #syncButtons {
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
    }

    #road-coloring-app #syncButtons button {
        min-width: 70px;
        font-size: 12px;
        padding: 6px 10px;
    }
}

@media (max-width: 480px) {
    
    #road-coloring-app {
        font-size: 13px;
    }

    #road-coloring-app h1 {
        font-size: 18px;
    }

    #road-coloring-app select,
#road-coloring-app #syncInput {
        font-size: 12px;
        padding: 6px 10px;
    }

    #road-coloring-app button {
        font-size: 12px;
        padding: 6px 10px;
    }

    
    #road-coloring-app #syncInputBlock {
        display: block !important;
        width: 100%;
        margin-bottom: 10px;
    }

    #road-coloring-app #syncInput {
        width: 100%;
        box-sizing: border-box;
        margin-top: 5px;
    }

    
    #road-coloring-app #syncButtons {
        display: flex;
        flex-wrap: nowrap;
        align-items: center;
        justify-content: flex-start;
        gap: 8px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 4px;
        font-size: 12px;
        margin-top: 10px;
    }

    #road-coloring-app #syncButtons button {
        white-space: nowrap;
        min-width: 70px;
        flex-shrink: 0;
        font-size: 11px;
        padding: 5px 10px;
    }

    
    #road-coloring-app #syncButtons::-webkit-scrollbar {
        height: 6px;
    }

    #road-coloring-app #syncButtons::-webkit-scrollbar-thumb {
        background-color: rgba(0, 0, 0, 0.2);
        border-radius: 3px;
    }
}


#road-coloring-app #syncButtons {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: center;
    gap: 10px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-top: 10px;
    padding-bottom: 4px;
    font-size: 14px;
}

#road-coloring-app #syncButtons button {
    white-space: nowrap;
    min-width: 80px;
    flex-shrink: 0;
    font-size: inherit;
}

#road-coloring-app #syncButtons::-webkit-scrollbar {
    height: 6px;
}

#road-coloring-app #syncButtons::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}
#road-coloring-app{display:flex;flex-direction:column;align-items:center;width:100%;box-sizing:border-box}
#road-coloring-app .container{box-sizing:border-box}
#road-coloring-app #graphCanvas{width:min(100%,600px);height:auto;max-height:none;aspect-ratio:1/1;touch-action:manipulation;box-sizing:border-box}