/* ============================================================
   Canvas — Drag & Drop Layout with jsPlumb
   ============================================================ */

.canvas-layout {
    display: flex;
    gap: 0;
    height: calc(100vh - 160px);
    min-height: 500px;
}

/* --- Toolbox (left sidebar) --- */
.canvas-toolbox {
    width: 220px;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.canvas-toolbox h4 {
    padding: 14px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--color-border);
    margin: 0;
}

.toolbox-search {
    padding: 8px 12px;
}

.toolbox-search input {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 13px;
}

.toolbox-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.toolbox-device {
    padding: 10px;
    margin-bottom: 8px;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    cursor: grab;
    text-align: center;
    transition: all var(--transition);
    user-select: none;
}

.toolbox-device:hover {
    border-color: var(--color-primary);
    background: #eff6ff !important;
}

.toolbox-device:active {
    cursor: grabbing;
    transform: scale(0.95);
}

.toolbox-device-label {
    font-size: 12px;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.toolbox-device-info {
    font-size: 11px;
}

.toolbox-actions {
    padding: 12px;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* --- Canvas Area --- */
.canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.canvas-toolbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 16px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    font-size: 13px;
}

.canvas-toolbar select {
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 13px;
}

.canvas-viewport {
    flex: 1;
    overflow: auto;
    background: #f8fafc;
    position: relative;
}

.canvas-surface {
    position: relative;
    width: 2000px;
    height: 1500px;
    background: white;
    background-image:
        linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
    background-size: 20px 20px;
    transform-origin: 0 0;
}

.canvas-empty {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 16px;
    pointer-events: none;
}

/* --- Canvas Devices --- */
.canvas-device {
    position: absolute;
    border-radius: 8px;
    color: white;
    cursor: move;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    z-index: 10;
    display: flex;
    flex-direction: column;
    overflow: visible;
    min-width: 100px;
    min-height: 60px;
}

.canvas-device:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
    z-index: 20;
}

.canvas-device-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 10px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px 8px 0 0;
    font-size: 12px;
    font-weight: 600;
}

.device-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.device-delete-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.device-delete-btn:hover {
    background: rgba(255,0,0,0.5);
}

.canvas-device-body {
    flex: 1;
    padding: 6px 10px;
    font-size: 11px;
    opacity: 0.8;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* --- Port Endpoints --- */
.port-endpoint {
    position: absolute;
    width: 12px;
    height: 12px;
    background: #666;
    border: 2px solid #333;
    border-radius: 50%;
    cursor: crosshair;
    z-index: 30;
    transform: translate(-50%, -50%);
}

.port-endpoint:hover {
    background: #ff9900;
    border-color: #cc7700;
    transform: translate(-50%, -50%) scale(1.3);
}

.port-left  { /* positioned via inline styles */ }
.port-right { /* positioned via inline styles */ }
.port-top   { /* positioned via inline styles */ }
.port-bottom { /* positioned via inline styles */ }

/* --- jsPlumb Overrides --- */
.connection-label {
    background: white;
    padding: 2px 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 11px;
    color: var(--color-text);
    pointer-events: all;
    cursor: pointer;
}

.connection-label:hover {
    background: #eff6ff;
    border-color: var(--color-primary);
}

/* jsPlumb endpoint when selected */
.jtk-endpoint.jtk-endpoint-connected {
    background: #16a34a !important;
}

.jtk-connector {
    z-index: 5;
}

.jtk-overlay {
    z-index: 6;
}