:root {
    --bg-black: #050505;
    --bg-card: #111111;
    --silver: #a0a0a0;
    --silver-bright: #ffffff;
    --accent: #ffffff;
    --border-color: #252525;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-black);
    color: var(--silver);
    line-height: 1.6;
}

/* Header with Chrome Gradient */
header {
    background: linear-gradient(180deg, #111 0%, var(--bg-black) 100%);
    padding: 100px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

header a {
    color: #555;
    text-decoration: none;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: var(--transition);
}

header a:hover {
    color: var(--accent);
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-top: 20px;
    background: linear-gradient(to bottom, #fff 30%, #555 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -2px;
}

.container {
    max-width: 850px;
    margin: -50px auto 50px; /* Pulls content up into header area slightly */
    padding: 0 20px;
}

/* Intro Section */
#intro-section h2 {
    color: var(--silver-bright);
    font-size: 1.8rem;
    margin-bottom: 20px;
}

/* The Demo Box - Modernized with Glass effect */
#demo-box {
    background: linear-gradient(145deg, #1a1a1a, #111);
    border: 1px solid var(--border-color);
    padding: 40px;
    margin: 40px 0;
    text-align: center;
    border-radius: 4px;
    color: var(--silver-bright);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    transition: var(--transition);
}

#demo-box strong {
    color: var(--accent);
    font-family: monospace;
    background: #222;
    padding: 2px 6px;
    border-radius: 3px;
}

/* Control Panel */
.controls {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.controls h3 {
    color: var(--silver-bright);
    margin-bottom: 20px;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Modern Button Style */
button {
    padding: 12px 24px;
    border: 1px solid #444;
    background-color: transparent;
    color: white;
    cursor: pointer;
    border-radius: 2px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
}

button:hover {
    background-color: white;
    color: black;
    border-color: white;
    transform: translateY(-2px);
}

#btn-color {
    border-color: var(--silver);
}

/* Result Text */
#toggle-text {
    margin-top: 30px;
    font-size: 1.1rem;
    color: #888;
    font-style: italic;
    border-left: 2px solid #333;
    padding-left: 15px;
}

/* Responsive */
@media (max-width: 600px) {
    header { padding: 60px 20px; }
    header h1 { font-size: 2.2rem; }
    
    button {
        width: 100%;
    }
    
    .container {
        margin-top: 20px;
    }
}