/* Reset default margins */
html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #303030;
    position: relative;
    overscroll-behavior-x:none;
}
#screen {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* Container for all draw layers
   Keep these full-screen; canvases will be positioned/sized by JS */
#layers {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* layer canvases should not capture input */
}
#ui {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* UI should be able to receive events (buttons, etc). You can adjust per-layer. */
    pointer-events: auto;
    overscroll-behavior-x:none;
    z-index: 100;
}

/* All layer canvases */
#layers canvas.layer,
#ui canvas.layer {
    position: absolute;
    top: 0;
    left: 0;
    background: transparent;
    image-rendering: pixelated;
    overflow: hidden;
    touch-action: none;
    overscroll-behavior-x:none;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    /* width/height intentionally controlled by JS */
    /* Prevent canvases from intercepting pointer events so HTML UI children receive input */
    pointer-events: none;
}

/* debug box */
#debug {
    position: absolute;
    top: 0;
    left: 0;
    width: 100px;
    height: 20px;
    font-family: monospace;
    white-space: pre; /* preserves spacing and newlines exactly */
    background: #ffffff;
    z-index: 9999;
    font-size:13px;
    color:#FFF;
    user-select: none;
}

/* Mobile UI panels */
.mobile-left-panel, .mobile-right-panel {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 240px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 8px;
    box-sizing: border-box;
    z-index: 200;
    pointer-events: auto;
}
.mobile-left-panel { align-items: stretch; }
.mobile-right-panel { align-items: stretch; }
.hk-container { display: flex; flex-direction: column; gap:6px; }
.brush-group { display:flex; gap:6px; }
.mobile-btn {
    background: rgba(0,0,0,0.6);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.08);
    padding: 8px 10px;
    font-size: 14px;
    border-radius: 6px;
    touch-action: manipulation;
    width: 50px;
    max-width: none;
}
.mobile-btn.big { width: 100%; max-width: none; }
.hk-container > button { width: 100%; }
.mobile-right-panel .mobile-scroll { overflow-y: auto; -webkit-overflow-scrolling: touch; max-height: 100%; display:flex; flex-direction:column; gap:8px; pointer-events: auto; }

/* Right panel buttons wider (approx 4x) */
.mobile-right-panel .mobile-btn { width: 200px; max-width: calc(100% - 16px); }

/* Make left-side H/K buttons match big button widths */
.mobile-left-panel .hk-container > button { width: 100%; }

/* Shift panels slightly away from center (left goes left, right goes right) */
.mobile-left-panel { left: 0; transform: translateX(-1vw); }
.mobile-right-panel { right: 0; transform: translateX(1vw); }

/* Ensure scroll container uses pointer-based handling (we'll use JS drag-to-scroll) */
.mobile-right-panel .mobile-scroll { touch-action: none; }

/* compact layout for narrow screens */
@media (max-width: 900px) {
    .mobile-left-panel, .mobile-right-panel { width: 160px; padding:6px; }
    .mobile-btn { font-size: 12px; padding:6px 8px; }
}