:root {
    color-scheme: dark;
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
    background: #000;
}

body {
    font-family: Inter, Arial, Helvetica, sans-serif;
}

#gpu-canvas {
    display: block;
    width: 100vw;
    height: 100vh;
}

#hud {
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 20;
    pointer-events: none;
}

#fps-counter {
    min-width: 84px;
    padding: 8px 10px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 10px;
    background: rgba(8, 12, 22, 0.66);
    color: rgba(235, 244, 255, 0.96);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.03em;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.30);
    backdrop-filter: blur(8px);
}

#fallback {
    position: fixed;
    top: 20px;
    left: 20px;
    max-width: 560px;
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    background: rgba(8, 10, 18, 0.88);
    color: #f2f5ff;
    line-height: 1.45;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(8px);
    z-index: 30;
}