/* Zero out default browser behaviors */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Absolute Black Background and Full Viewport Lock */
body {
    background-color: #000000;
    color: #00ff66; /* Intense HTOP Green */
    font-family: 'Share Tech Mono', 'Courier New', monospace;
    overflow: hidden; /* Prevents unwanted scrollbars */
}

/* Container to center content horizontally and vertically */
.viewport-container {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    width: 100vw;
    height: 100vh;
    padding: 20px;
}

/* Content block constraints */
.terminal-card {
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Main Heading Styling with Emissive Glow */
.main-heading {
    font-size: 5.5rem;
    font-weight: normal;
    letter-spacing: -1px;
    text-transform: uppercase;
    text-shadow: 0 0 10px rgba(0, 255, 102, 0.5), 0 0 20px rgba(0, 255, 102, 0.3);
    line-height: 1.1;
}

/* Subtext Styling */
.subtext {
    font-size: 1.2rem;
    line-height: 1.6;
    letter-spacing: 1px;
    opacity: 0.85;
    text-transform: lowercase;
    max-width: 600px;
    margin: 0 auto;
}

/* Animated Blinking Underscore Terminal Cursor */
.cursor {
    display: inline-block;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    from, to { color: transparent }
    50% { color: #00ff66; }
}

/* Responsive Scaling Rules for Mobile Viewports */
@media (max-width: 768px) {
    .main-heading {
        font-size: 3.5rem;
    }
    .subtext {
        font-size: 1rem;
        padding: 0 10px;
    }
}

@media (max-width: 480px) {
    .main-heading {
        font-size: 2.5rem;
    }
}