*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-color: #0a0a0a;
    --container-bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --highlight-color: #39FF14;      
    --accent-color: #2E8B57;         
    --font-mono: 'Cascadia Code', 'Fira Code', 'Roboto Mono', monospace; 
    --font-size-base: 1rem;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    min-height: 100vh;
    display: flex;
    align-items: center;        
    justify-content: center;    
    overflow: hidden;           
    line-height: 1.6;
    -webkit-font-smoothing: antialiased; 
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 900px;
    width: 90%;
    padding: 2.5rem 2rem;
    border: 1px solid var(--accent-color); 

    box-shadow: 0 0 15px rgba(57, 255, 20, 0.4); 
    background-color: var(--container-bg-color);
    text-align: center;
    border-radius: 4px; 
}

.logo {
    font-size: 2.5em; 
    margin-bottom: 2rem;
    display: flex; 
    justify-content: center;
    align-items: baseline; 
    font-weight: 600; 
    user-select: none; 
}

.logo .prompt {
    font-size: 0.8em; 
    color: var(--text-color);
    margin-right: 0.5ch; 
    opacity: 0.8;
}

.logo .brand {
    letter-spacing: 0.05em; 
    color: var(--highlight-color);

    text-shadow: 0 0 5px rgba(57, 255, 20, 0.8), 0 0 10px rgba(57, 255, 20, 0.5); 
}

.logo .cursor {
    display: inline-block;
    width: 0.4em; 
    height: 1em; 
    background-color: var(--highlight-color);
    vertical-align: middle; 
    margin-left: 0.2em;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    from, to { background-color: transparent; }
    50% { background-color: var(--highlight-color); }
}

.content {
    margin-bottom: 2.5rem;
}

.message {
    margin-bottom: 1rem;
    font-size: 1.1em;
    opacity: 0.9;
}

.message.main-message {
    font-size: 1.4em;
    font-weight: 600;
    color: var(--highlight-color);

    text-shadow: 0 0 3px rgba(57, 255, 20, 0.6); 
}

.message.sub-message {
    font-size: 1em;
    opacity: 0.7;
    margin-top: 1.5rem; 
}

.footer {
    font-size: 0.85em;
    opacity: 0.5; 
    color: var(--text-color);
    padding-top: 1.5rem;

    border-top: 1px dashed rgba(46, 139, 87, 0.3); 
}

@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 2rem 1.5rem;
    }
    .logo {
        font-size: 2em;
    }
    .message.main-message {
        font-size: 1.25em;
    }
    .message.sub-message {
        font-size: 0.95em;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1.5rem 1rem;
    }
    .logo {
        font-size: 1.7em;
    }
    .message.main-message {
        font-size: 1.1em;
    }
    .message.sub-message {
        font-size: 0.85em;
    }
    .footer {
        font-size: 0.75em;
    }
}