/* Global layout and canvas styles (moved from index.html and JS) */

:root {
    --bg-color: #050607;
    --ui-bg: rgba(3, 6, 10, 0.72);
    --ui-accent: #88ccff;
    --ui-accent-soft: #00ffcc;
    --ui-foreground: #e6f7ff;
    --ui-foreground-muted: #9fb3c7;
    --glow-soft: 0 0 16px rgba(0, 255, 204, 0.22);
    --glow-medium: 0 0 28px rgba(136, 204, 255, 0.45);
    --glow-strong: 0 0 40px rgba(0, 255, 204, 0.65);
}

/* Page / body */
html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: radial-gradient(ellipse at center, #0a0e1a 0%, #050607 60%);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    color: var(--ui-foreground);
}

/* Primary game canvas (renderer) */
.game-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* FX canvas overlay */
.fx-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

/* UI layer centered control bar */
#ui-layer {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
    background: rgba(3, 6, 10, 0.85);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid rgba(136, 204, 255, 0.35);
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.8),
        var(--glow-soft);
    backdrop-filter: blur(12px);
    flex-wrap: wrap;
    justify-content: center;
    max-width: 90vw;
}

/* Lightweight buttons with luminous feedback */
.ui-btn {
    background: radial-gradient(circle at top, rgba(12, 16, 22, 0.95), rgba(5, 8, 12, 0.98));
    border: 1px solid rgba(136, 204, 255, 0.25);
    color: var(--ui-foreground);
    padding: 10px 18px;
    border-radius: 999px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    transition: all 0.24s ease;
    min-height: 40px;
    min-width: 64px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 8px rgba(0, 255, 204, 0.08);
}

.ui-btn:hover {
    background: radial-gradient(circle at top, rgba(0, 28, 40, 0.98), rgba(0, 10, 16, 0.99));
    border-color: rgba(0, 255, 204, 0.7);
    box-shadow:
        inset 0 0 8px rgba(0, 255, 204, 0.12),
        var(--glow-medium);
    transform: translateY(-2px);
}

.ui-btn.active {
    background: linear-gradient(135deg, rgba(136, 204, 255, 0.95), rgba(0, 255, 204, 0.85));
    color: #050607;
    border-color: rgba(0, 255, 204, 1);
    box-shadow: var(--glow-strong);
    font-weight: 800;
}

/* Small stats banner */
.ui-stats {
    position: absolute;
    top: -32px;
    left: 0;
    width: 100%;
    text-align: center;
    color: var(--ui-foreground-muted);
    font-size: 11px;
    letter-spacing: 0.8px;
    pointer-events: none;
    text-transform: uppercase;
}