/* Basic layout */
:root {
    --left-w: 200px;
    --right-w: 300px;
    --gap: 12px;
    --bg: #f5f6fa;
}

html, body, #app {
    height: 100%;
    margin: 0;
    font-family: Segoe UI, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: #222;
}

#app {
    display: grid;
    grid-template-columns: var(--left-w) 1fr var(--right-w);
    grid-gap: var(--gap);
    padding: var(--gap);
    box-sizing: border-box;
    height: calc(100vh - 2 * var(--gap));
}

aside#leftbar, aside#props {
    background: #fff;
    border-radius: 6px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    padding: 10px;
    overflow: auto;
}

main#canvas-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#canvas-controls {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

/* allow handles to overflow the paper area so controls are not clipped */
#canvas-wrap {
    flex: 1;
    background: #e9ecef;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    padding: 10px;
    overflow: visible; /* must be visible so selection handles are not clipped */
}

    /* base canvas style */
    #canvas-wrap canvas {
        box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        background: #fff;
        display: block;
    }

/* Fabric wrapper and canvas positioning so upper-canvas (controls) sits on top */
.canvas-container {
    position: relative !important;
    display: inline-block !important;
    z-index: 1;
    /* keep wrapper background transparent; actual paper background set on canvas DOM */
    background: transparent;
    overflow: visible !important;
}

    .canvas-container canvas {
        position: absolute !important;
        left: 0;
        top: 0;
        display: block;
    }

    /* ensure layering - upper canvas (controls & selection) must be on top */
    .canvas-container .lower-canvas {
        z-index: 10 !important;
    }

    .canvas-container .upper-canvas {
        z-index: 9999 !important;
        pointer-events: auto !important;
    }

/* Left panel controls */
.panel {
    margin-bottom: 12px;
}

.panel-toggle {
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    font-weight: 600;
    padding: 6px 0;
    cursor: pointer;
}

.panel-body {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 6px;
}

.tool {
    padding: 6px 8px;
    border-radius: 4px;
    border: 1px solid #ddd;
    background: #fafafa;
    cursor: pointer;
    min-width: 38px;
    text-align: center;
}

/* Right property panel */
#props h3 {
    margin-top: 0;
}

#prop-panel label {
    display: block;
    margin: 6px 0;
}

#prop-panel input[type="color"] {
    vertical-align: middle;
    margin-left: 6px;
}

/* Responsive tiny screens */
@media (max-width:900px) {
    :root {
        --left-w: 160px;
        --right-w: 200px;
    }
}