/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

/* Background */
body {
    position: relative;
    height: 100vh;
    background: radial-gradient(circle at center, #001a00, #000);
    color: #00ff99;
}

/* Tron grid */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

    background: repeating-linear-gradient(
        0deg,
        rgba(0, 255, 153, 0.1) 0px,
        rgba(0, 255, 153, 0.1) 1px,
        transparent 1px,
        transparent 40px
    ),
    repeating-linear-gradient(
        90deg,
        rgba(0, 255, 153, 0.1) 0px,
        rgba(0, 255, 153, 0.1) 1px,
        transparent 1px,
        transparent 40px
    );

    z-index: -1;
    pointer-events: none;
}

/* Buttons */
button {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid #00ff99;
    color: #00ff99;
    cursor: pointer;
    transition: 0.3s;
    text-transform: uppercase;
}

button:hover {
    background: #00ff99;
    color: #000;
    box-shadow: 0 0 15px #00ff99;
}