:root {
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --secondary: #818CF8;
    --accent: #A5B4FC;
    --bg-main: #0F0F1A;
    /* Dark blueprint theme */
    --bg-panel: #1A1A24;
    --bg-border: #2A2A35;
    --text-main: #E2E8F0;
    --text-muted: #94A3B8;

    --shape-fill: #1E1E2E;
    --shape-stroke: #6366F1;
    --connection: #818CF8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow: hidden;
    user-select: none;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* Toolbar */
.toolbar {
    height: 50px;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--bg-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 10;
}

.toolbar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--accent);
}

.toolbar-actions,
.toolbar-export {
    display: flex;
    align-items: center;
    gap: 8px;
}

.divider {
    width: 1px;
    height: 24px;
    background-color: var(--bg-border);
    margin: 0 8px;
}

button {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--bg-border);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

button:hover:not(:disabled) {
    background-color: rgba(99, 102, 241, 0.1);
    border-color: var(--primary);
    color: var(--accent);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button.danger:hover {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
    color: #ef4444;
}

.toggle-label {
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

/* Workspace */
.main-workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebars */
.palette {
    width: 250px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--bg-border);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 5;
    overflow-y: auto;
}

.properties-panel {
    width: 250px;
    background-color: var(--bg-panel);
    border-left: 1px solid var(--bg-border);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 5;
    overflow-y: auto;
}

h3 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

/* Shape Palette */
.shape-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.shape-item {
    width: 100%;
    height: 70px;
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--bg-border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: grab;
    transition: background 0.2s;
    color: var(--text-muted);
    font-size: 12px;
    gap: 4px;
}

.shape-item:hover {
    background-color: rgba(99, 102, 241, 0.05);
    border-color: var(--primary);
    color: var(--accent);
}

.shape-item:active {
    cursor: grabbing;
}

.shortcuts-list {
    list-style: none;
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 8px;
}

.shortcuts-list b {
    color: var(--text-main);
}

/* CanvasContainer */
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-main);
}

.canvas-container.panning {
    cursor: grab;
}

.canvas-container.panning:active {
    cursor: grabbing;
}

.canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* SVG Elements styles */
.shape {
    cursor: pointer;
}

.shape-rect,
.shape-diamond,
.shape-ellipse,
.shape-parallelogram {
    fill: var(--shape-fill);
    stroke: var(--shape-stroke);
    stroke-width: 2;
    transition: filter 0.2s;
}

.shape-group:hover .shape-rect,
.shape-group:hover .shape-diamond,
.shape-group:hover .shape-ellipse,
.shape-group:hover .shape-parallelogram {
    filter: brightness(1.2);
}

.shape-group.selected .shape-rect,
.shape-group.selected .shape-diamond,
.shape-group.selected .shape-ellipse,
.shape-group.selected .shape-parallelogram {
    stroke: #fff;
    stroke-width: 3;
    filter: drop-shadow(0 0 4px rgba(99, 102, 241, 0.5));
}

.shape-text {
    fill: var(--text-main);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: central;
}

.connection {
    fill: none;
    stroke: var(--connection);
    stroke-width: 2;
    cursor: pointer;
    transition: stroke-width 0.2s, stroke 0.2s;
}

.connection:hover {
    stroke-width: 4;
    stroke: var(--primary);
}

.connection.selected {
    stroke: #fff;
    stroke-width: 3;
}

.temp-connection {
    pointer-events: none;
    stroke-dasharray: 4 4;
    opacity: 0.6;
}

/* Port marks for connecting */
.port {
    fill: var(--bg-main);
    stroke: var(--accent);
    stroke-width: 1.5;
    r: 4;
    opacity: 0;
    cursor: crosshair;
    transition: opacity 0.2s, r 0.2s;
}

.shape-group:hover .port,
.shape-group.selected .port {
    opacity: 1;
}

.port:hover {
    r: 6;
    fill: var(--primary);
}

/* Rubberband for multi-select */
.rubberband {
    fill: rgba(99, 102, 241, 0.1);
    stroke: var(--primary);
    stroke-dasharray: 4 4;
    stroke-width: 1;
    pointer-events: none;
    display: none;
}

/* Properties */
.prop-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
}

.prop-group label {
    font-size: 12px;
    color: var(--text-muted);
}

.prop-group input[type="color"] {
    width: 100%;
    height: 32px;
    border: 1px solid var(--bg-border);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
}

.prop-group textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--bg-border);
    color: var(--text-main);
    padding: 8px;
    border-radius: 4px;
    font-family: inherit;
    font-size: 13px;
    resize: vertical;
}

.empty-state {
    font-size: 13px;
    color: var(--text-muted);
    font-style: italic;
}

/* Text Editor overlay */
#text-edit-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 100;
}

#text-edit-overlay.hidden {
    display: none;
}

#text-edit-overlay textarea {
    position: absolute;
    pointer-events: auto;
    background: transparent;
    border: 1px dashed var(--primary);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    text-align: center;
    resize: none;
    overflow: hidden;
    outline: none;
    padding: 4px;
}