* {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: black; /* All text should be black */
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #f5f5f5; /* App background, canvas is white */
}

#toolbar {
    height: 60px;
    background: #fff;
    border-bottom: 1px solid #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    z-index: 100;
    position: relative;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.brand {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

#toolbar button {
    background: white;
    border: 1px solid #ccc;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-left: 10px;
}

#toolbar button:hover {
    background: #f0f0f0;
    border-color: #aaa;
}

#canvas-container {
    width: 100%;
    height: calc(100% - 60px);
    overflow: auto; /* Scrollable canvas area */
    position: relative;
}

#canvas {
    width: 4000px;
    height: 4000px;
    background-color: white; /* The overall background of the canvas should be white */
    position: relative;
    transform-origin: 0 0;
}

#lines-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to tables */
    z-index: 10;
}

.connection-path {
    fill: none;
    stroke: black; /* All lines black */
    stroke-width: 2;
    stroke-linejoin: round;
}

.connection-path-hover {
    stroke-width: 4;
    cursor: pointer;
    pointer-events: stroke;
}

/* Table Element */
.schema-table {
    position: absolute;
    background: white;
    border: 1px solid black;
    border-radius: 0; /* Professional sharp edges or slight rounding depending on preference. Going with sharp for diagram feel. */
    box-shadow: 2px 2px 0 rgba(0,0,0,0.1);
    min-width: 200px;
    z-index: 20;
    user-select: none;
}

.schema-table.dragging {
    opacity: 0.8;
    z-index: 100;
    box-shadow: 4px 4px 0 rgba(0,0,0,0.15);
}

.table-header {
    background: #f8f8f8;
    border-bottom: 1px solid black;
    padding: 8px 12px;
    font-weight: bold;
    cursor: grab;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header:active {
    cursor: grabbing;
}

.table-title {
    outline: none;
    flex-grow: 1;
}

.table-actions {
    display: flex;
    gap: 4px;
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 12px;
    padding: 2px 4px;
    opacity: 0.5;
}

.action-btn:hover {
    opacity: 1;
}

.action-btn.delete-table-btn:hover {
    color: #ef4444;
    opacity: 1;
}

#clear-btn:hover {
    background: #fee2e2;
    color: #ef4444;
    border-color: #fca5a5;
}

/* Row wrapper */
.table-row {
    display: flex;
    flex-direction: row; /* Multi-col, single row */
}

/* Cell */
.table-cell {
    border-right: 1px solid black;
    padding: 10px;
    min-width: 80px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
}

.table-cell:last-child {
    border-right: none;
}

.cell-content {
    outline: none;
    width: 100%;
    text-align: center;
    min-height: 20px;
    margin-bottom: 8px; /* space for connection dot */
}

/* Connection Node */
.conn-node {
    width: 12px;
    height: 12px;
    background: white;
    border: 2px solid black;
    border-radius: 50%;
    position: absolute;
    bottom: -6px; /* Positioned at the very bottom */
    left: 50%;
    transform: translateX(-50%);
    cursor: crosshair;
    z-index: 30;
}

.conn-node:hover {
    background: #eee;
    transform: translateX(-50%) scale(1.2);
}

.conn-node.active {
    background: black;
}

/* Hide unconnected nodes during export */
#canvas.exporting .conn-node:not(.connected) {
    visibility: hidden;
}

/* Hide table edit actions (+Col, Delete) during export */
#canvas.exporting .table-actions {
    display: none;
}

/* Snap Lines */
.snap-line {
    stroke: black;
    stroke-width: 1px;
    stroke-dasharray: 4 4;
    pointer-events: none;
    z-index: 5;
}