:root {
    --bg-color: #050508;
    --panel-bg: rgba(20, 20, 30, 0.4);
    --text-primary: #ffffff;
    --text-secondary: #8888aa;
    --accent-cyan: #00f2ff;
    --accent-purple: #bd00ff;
    --glass-border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Header / Controls Overlay */
header {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

h1 {
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 10px;
}

h1::before {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    background-color: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-cyan);
}

.status {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Main Canvas Area */
main {
    flex: 1;
    position: relative;
    width: 100%;
    /* User requested 20% margin top/bottom, 10% left/right */
    padding: 20vh 10vw;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Instructions Overlay (if js fails or loading) */
#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    pointer-events: none;
}