body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: linear-gradient(135deg, #0c1445 0%, #1a1a2e 50%, #16213e 100%);
    font-family: 'Arial', sans-serif;
}

#canvas-container {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

#loading {
    position: absolute;
    left: 12px;
    top: 12px;
    color: #efe;
    background: rgba(0,0,0,0.35);
    padding: 8px 10px;
    border-radius: 8px;
    font-weight: 600;
    z-index: 1100;
}

/* ui-debug removed */

/* Compact always-visible controls panel (small neat card) */
.controls {
    position: fixed;
    top: 12px;
    right: 12px;
    width: 210px;
    max-width: 45vw;
    background: rgba(0,0,0,0.36);
    color: #dff;
    border-radius: 10px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.45);
    z-index: 1200;
    overflow: hidden;
    font-size: 14px;
}
.controls .controls-header { background: rgba(255,255,255,0.02); border-bottom: 1px solid rgba(255,255,255,0.03); }
.controls .controls-body { padding: 8px; max-height: calc(100vh - 36px); overflow-y: auto; }
.controls input[type=range] { accent-color: #8ec5ff; }
.controls button.btn-sm { padding: 6px 8px; font-size: 13px; }
.controls label { color: #e6f7ff; }

@media (max-width: 480px) {
    .controls { width: 84vw; left: 8vw; right: 8vw; top: 8px; }
    .controls .controls-body { max-height: calc(100vh - 24px); }
}

/* small visual tweaks */
.controls.collapsed .controls-body { display: none; }
.controls .controls-body { transition: max-height 0.18s ease; }
.controls button { margin: 0 0 6px 0; padding: 8px 10px; background: linear-gradient(45deg, #4fc3f7, #29b6f6); color: white; border: none; border-radius: 8px; cursor: pointer; font-weight: bold; transition: all 0.18s ease; box-shadow: 0 4px 12px rgba(79, 195, 247, 0.25); width: 100%; text-align: left; }
.controls button:hover { background: linear-gradient(45deg, #29b6f6, #039be5); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(79, 195, 247, 0.4); }
.controls > div { display: flex; flex-direction: column; gap: 6px; padding-top: 6px; text-align: left; }
.controls label { display: block; font-size: 13px; }

@media (max-width: 640px) {
    .controls { top: auto; bottom: 12px; right: 12px; transform: none; width: auto; border-radius: 12px; }
    .controls button { text-align: center; }
}

/* Hamburger toggle for mobile */
.controls-hamburger {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 1250;
    background: rgba(0,0,0,0.5);
    color: #eafaff;
    border: none;
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 18px;
    display: none; /* shown on small screens */
}

@media (max-width: 640px) {
    .controls-hamburger { display: block; }
    /* hide full controls by default on small screens; toggled via JS */
    .controls { display: none; }
    .controls.show-mobile { display: block; width: 84vw; left: 8vw; right: 8vw; top: 8px; }
}

/* subtle footer credit (non-intrusive) */
#site-footer {
    position: fixed;
    left: 8px;
    bottom: 8px;
    z-index: 1050; /* under controls but above canvas */
    font-size: 12px;
    color: rgba(230,245,255,0.85);
    background: rgba(0,0,0,0.18);
    padding: 6px 8px;
    border-radius: 6px;
    pointer-events: auto;
}
#site-footer a { color: rgba(200,235,255,0.9); text-decoration: none; opacity: 0.9; }
#site-footer a:hover { text-decoration: underline; opacity: 1.0; }