:root {
    /* DARK MODE: OLED Black */
    --bg-color: #000000; 
    --text-color: #f5f5f5;
    --btn-bg: #333;
    --btn-text: #fff;
    --glow: 0 0 20px rgba(255, 255, 255, 0.6);
    --star-color: rgba(255, 255, 255, 0.9); 
}

.light-mode {
    /* LIGHT MODE: Warm Parchment */
    --bg-color: #dcdad1; 
    --text-color: #2c2c2c; 
    --btn-bg: #b0aea6;
    --btn-text: #000;
    --glow: none;
    --star-color: rgba(80, 70, 60, 0.8); 
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: monospace;
    background-color: var(--bg-color);
    color: var(--text-color);
    
    /* Unequal transition for human eyes */
    transition: background-color 0.5s ease, color 0.5s ease;
    overflow: hidden; 
}

body.light-mode {
    transition: background-color 1.2s ease, color 1.2s ease;
}

#star-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; 
    z-index: 999;
}

.code-text {
    font-size: 4rem;
    font-weight: bold;
    text-shadow: var(--glow);
    transition: text-shadow 0.8s ease;
    z-index: 10; 
}

#theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 10px 15px;
    font-size: 1.5rem;
    cursor: pointer;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: 50px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s ease, background-color 0.8s;
    z-index: 1000; 
}

#theme-toggle:hover { transform: scale(1.1); }