body {
    background-color: #202020;
    color: #fff;
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

#container {
    position: relative;
}

#screen {
    width: 100%;
    max-width: 640px;
    aspect-ratio: 4 / 3;
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 20px solid #111; /* Physical monitor bezel */
    border-radius: 20px; /* Rounded bezel corners */
    box-shadow: 
        0 0 0 2px #333,
        0 0 20px rgba(0,0,0,0.8);
    overflow: hidden;
    box-sizing: border-box;
}

@media (max-width: 600px) {
    #screen {
        border-width: 10px;
        border-radius: 10px;
    }
    
    body {
        padding: 10px;
        box-sizing: border-box;
    }
}

canvas#crt-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: pointer;
    touch-action: manipulation;
}

#controls {
    margin-top: 30px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

/* ZX Spectrum Key Style */
#load-btn {
    width: 80px;
    height: 60px;
    background: #525c65; /* Rubber grey */
    border: none;
    border-radius: 8px; /* Soft corners */
    padding: 6px 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: 
        inset 2px 2px 3px rgba(255,255,255,0.15),
        inset -2px -2px 3px rgba(0,0,0,0.3),
        0 5px 10px rgba(0,0,0,0.4);
    cursor: pointer;
    position: relative;
    transition: transform 0.1s, box-shadow 0.1s;
    font-family: Arial, sans-serif; /* Key labels are sans */
    user-select: none;
}

#load-btn:hover {
    background: #5c6770;
}

#load-btn:active {
    transform: translateY(3px);
    box-shadow: 
        inset 2px 2px 5px rgba(0,0,0,0.4),
        0 1px 2px rgba(0,0,0,0.4);
}

.key-top {
    display: flex;
    justify-content: space-between;
    width: 100%;
}

.key-letter {
    color: #fff;
    font-size: 24px;
    font-weight: bold;
    line-height: 1;
    text-shadow: 0 1px 1px rgba(0,0,0,0.5);
}

.key-symbol {
    color: #cc0000; /* Red symbol */
    font-size: 14px;
    font-weight: bold;
    margin-top: 2px;
    text-shadow: 0 1px 0 rgba(0,0,0,0.2);
}

.key-word {
    color: #fff;
    font-size: 11px;
    font-weight: bold;
    text-align: right;
    width: 100%;
    text-shadow: 0 1px 1px rgba(0,0,0,0.5);
}