:root {
    --neon-blue: #00f2ff;
    --deep-space: #02060c;
    --terminal-green: #00ff41;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: var(--deep-space);
    color: var(--neon-blue);
    font-family: 'Courier New', Courier, monospace;
    overflow: hidden;
}

#starfield {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
}

.overlay {
    position: fixed;
    inset: 0;
    background:
        linear-gradient(rgba(18,16,16,0) 50%, rgba(0,0,0,0.1) 50%),
        linear-gradient(90deg, rgba(255,0,0,0.03), rgba(0,255,0,0.01), rgba(0,0,255,0.03));
    background-size: 100% 3px, 3px 100%;
    pointer-events: none;
    z-index: 10;
}

.interface {
    position: relative;
    z-index: 5;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hud-frame {
    border: 1px solid var(--neon-blue);
    padding: 2rem;
    background: rgba(0,242,255,0.05);
    box-shadow: 0 0 30px rgba(0,242,255,0.1);
    max-width: 80%;
    text-align: center;
}

h1 {
    letter-spacing: 10px;
    animation: flicker 2s infinite;
}

.data-line {
    color: var(--terminal-green);
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 30px;
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    text-decoration: none;
    transition: 0.3s;
}

.btn:hover {
    background: var(--neon-blue);
    color: var(--deep-space);
}

@keyframes flicker {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}