body {
    margin: 0;
    height: 50000px;
    background: #050505;
    color: white;
    font-family: monospace;
    overflow-x: hidden;
    user-select: none;
    overscroll-behavior-y: none;
    touch-action: pan-y;
}

canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
}

#crt {
    position: fixed;
    top: 0; 
    left: 0; 
    width: 100vw; 
    height: 100vh;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 2px, 3px 100%;
    z-index: 5;
    pointer-events: none;
}

#ui {
    position: fixed;
    top: 20px;
    left: 20px;
    font-size: 18px;
    line-height: 1.5;
    pointer-events: none;
    text-shadow: 2px 2px 0 #000;
    display: none;
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border: 1px solid #0ff;
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.2);
    z-index: 4;
}

#combo {
    color: #ff0;
    font-weight: bold;
    margin-left: 10px;
}

#intro {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    pointer-events: none;
    transition: opacity 0.5s;
    z-index: 4;
    text-shadow: 2px 2px 0 #000;
}

#warning {
    position: fixed;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 36px;
    color: #f00;
    text-shadow: 0 0 20px #f00;
    pointer-events: none;
    z-index: 6;
    animation: flash 0.4s infinite alternate;
    text-align: center;
    width: 100%;
}

@keyframes flash {
    from { opacity: 1; }
    to { opacity: 0; }
}

#menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(5, 5, 5, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

#menu h1 {
    font-size: 56px;
    margin-bottom: 10px;
    color: #0ff;
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
    text-align: center;
    letter-spacing: 4px;
}

#menu p {
    text-align: center;
    margin: 5px 0;
    font-size: 18px;
    color: #ccc;
}

#startBtn {
    margin-top: 40px;
    padding: 15px 40px;
    font-size: 24px;
    font-family: monospace;
    background: transparent;
    color: #0ff;
    border: 2px solid #0ff;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
}

#startBtn:hover {
    background: #0ff;
    color: #000;
    box-shadow: 0 0 25px rgba(0, 255, 255, 0.6);
}