:root {
    --bg-color: #fdfdfd;
    --ink-color: #222;
    --overlay-color: rgba(255, 255, 255, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--ink-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
    /* Prevent scrollbars */
    height: 100vh;
    width: 100vw;
    cursor: crosshair;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

#ui-layer {
    position: absolute;
    top: 2rem;
    /* user said don't leave empty space on top, but then said overlaid content... I'll move it to top left as it's a title now */
    left: 2rem;
    pointer-events: none;
    opacity: 0.8;
    transition: opacity 0.5s ease;
    z-index: 100;
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.6rem;
    /* Make it bigger/premium */
    font-weight: 400;
    letter-spacing: 0.1em;
    margin-bottom: 0;
    opacity: 0.9;
}

p {
    font-size: 0.8rem;
    opacity: 0.6;
    line-height: 1.4;
}

.controls {
    margin-top: 1rem;
    font-family: monospace;
    font-size: 0.75rem;
    display: none;
    /* Hide old controls if they still exist in DOM for some reason */
}

/* Navigation Arrows */
.nav-arrow {
    position: absolute;
    font-size: 3rem;
    color: var(--ink-color);
    opacity: 0.3;
    cursor: pointer;
    user-select: none;
    transition: opacity 0.3s ease, transform 0.2s ease;
    z-index: 20;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-arrow:hover {
    opacity: 0.7;
    transform: scale(1.1);
}

.nav-arrow:active {
    transform: scale(0.95);
}

.nav-arrow.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Landscape Mode (Default) */
@media (orientation: landscape) {
    #nav-prev {
        left: 20px;
        top: 50%;
        transform: translateY(-50%);
    }

    #nav-next {
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
    }

    /* Adjust hover transforms to include centering */
    #nav-prev:hover {
        transform: translateY(-50%) scale(1.1);
    }

    #nav-prev:active {
        transform: translateY(-50%) scale(0.95);
    }

    #nav-next:hover {
        transform: translateY(-50%) scale(1.1);
    }

    #nav-next:active {
        transform: translateY(-50%) scale(0.95);
    }
}

/* Portrait Mode */
@media (orientation: portrait) {
    .nav-arrow {
        transform: rotate(90deg);
        /* Rotate arrows to point up/down */
    }

    #nav-prev {
        top: 20px;
        left: 50%;
        transform: translateX(-50%) rotate(90deg);
        /* Point Up */
    }

    #nav-next {
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%) rotate(90deg);
        /* Point Down */
    }

    /* Adjust hover transforms */
    #nav-prev:hover {
        transform: translateX(-50%) rotate(90deg) scale(1.1);
    }

    #nav-prev:active {
        transform: translateX(-50%) rotate(90deg) scale(0.95);
    }

    #nav-next:hover {
        transform: translateX(-50%) rotate(90deg) scale(1.1);
    }

    #nav-next:active {
        transform: translateX(-50%) rotate(90deg) scale(0.95);
    }
}

/* Grain overlay */
.noise {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='1'/%3E%3C/svg%3E");
}