:root {
    --header-bg: #1e1e24;
    --header-height: 625px;
}

@media (max-width: 600px) {
    :root {
        --header-height: 450px;
        /* Smaller height for mobile */
    }
}

@media (max-height: 500px) and (orientation: landscape) {
    :root {
        --header-height: 300px;
        /* Reduce height in landscape */
    }
}

#header-container {
    position: relative;
    width: 100%;
    height: var(--header-height);
    background: radial-gradient(circle at 50% 50%, #2a2a35 0%, var(--header-bg) 100%);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 2px solid #ddd;
}

#canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    touch-action: pan-y;
    /* Allow vertical scrolling, block horizontal/zoom */
}