html,
body {
    width: 100%;
    height: 100%;
}

body {
    margin: 0;
    overflow: hidden;
    background: #000;
    cursor: pointer;
}

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

#wake-screen {
    position: fixed;
    inset: 0;
    z-index: 3;
    background: #000;
    transition: opacity 450ms ease;
}

#wake-screen.is-started {
    opacity: 0;
    pointer-events: none;
}

#wake-up {
    position: absolute;
    top: clamp(24px, 5vh, 64px);
    left: clamp(20px, 4vw, 72px);
    padding: 0;
    border: 0;
    outline: 0;
    color: #9dff7d;
    background: transparent;
    text-shadow: 0 0 7px rgba(99, 255, 70, 0.8);
    font: clamp(18px, 2vw, 28px)/1.4 "MatrixCodeRain", "MS Gothic", monospace;
    letter-spacing: 0.08em;
    cursor: pointer;
}

#wake-up:hover {
    color: #d2ffc3;
}

.wake-cursor {
    animation: wake-cursor-blink 0.8s steps(1, end) infinite;
}

@keyframes wake-cursor-blink {
    0%,
    45% { opacity: 1; }
    46%,
    100% { opacity: 0; }
}