app.py

:root {
    --green: #00ff9d;
    --orange: #ff9900;
    --bg-dark: #0a0a0a;
}

body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--bg-dark);
    font-family: 'Orbitron', sans-serif;
}

.fullscreen-bg {
    position: relative;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, #001a12, #000000);
}

#molecule-canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
}

.centered {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 1;
}

.title {
    font-size: 3em;
    color: var(--green);
    text-shadow: 0 0 20px var(--green);
}

#enter-btn {
    padding: 15px 40px;
    font-size: 1.5em;
    background: var(--green);
    color: black;
    border: none;
    cursor: pointer;
    border-radius: 8px;
    box-shadow: 0 0 20px var(--green);
    animation: pulse 1.5s infinite;
}

#enter-btn:hover {
    background: var(--orange);
    box-shadow: 0 0 20px var(--orange);
}

@keyframes pulse {
    0% { box-shadow: 0 0 10px var(--green); }
    50% { box-shadow: 0 0 30px var(--green); }
    100% { box-shadow: 0 0 10px var(--green); }
}