:root {
    --bg: #f4f6fb;
    --text: #172033;
    --muted: #526071;
    --note: #68758a;
    --panel-bg: #ffffff;
    --panel-border: #dce1ec;
    --panel-shadow: rgba(32, 45, 72, 0.08);
    --header-border: #e8ecf4;
    --btn-bg: #ffffff;
    --btn-border: #c6ccda;
    --btn-text: #172033;
    --field-bg: #ffffff;
    --field-text: #172033;
    --console-bg: #0f172a;
    --console-text: #e2e8f0;
    --error-bg: #fff1f1;
    --error-border: #f0b9b9;
    --error-text: #a40000;
    --accent: #2563eb;

    font-family: Inter, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
}

:root[data-theme="dark"] {
    --bg: #0b1120;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --note: #8595ad;
    --panel-bg: #131c2e;
    --panel-border: #263247;
    --panel-shadow: rgba(0, 0, 0, 0.45);
    --header-border: #263247;
    --btn-bg: #1e293b;
    --btn-border: #334155;
    --btn-text: #e2e8f0;
    --field-bg: #0f1729;
    --field-text: #e2e8f0;
    --console-bg: #05080f;
    --console-text: #cbd5e1;
    --error-bg: #3b1212;
    --error-border: #7f1d1d;
    --error-text: #fca5a5;
}

body {
    margin: 0;
}

/* ----- Data Flow Diagram mode -----
   Self-contained teal/cyan theme with both a light and a dark variant. The
   variables are declared on the .page.mode-dfd element itself so they override
   the inherited palette for this subtree, while still responding to the
   light/dark toggle (data-theme on :root). Default below is the LIGHT variant. */
.page.mode-dfd {
    --bg: #e6f6f3;
    --text: #0b3a36;
    --muted: #3f726b;
    --note: #4f827b;
    --panel-bg: #f3fbfa;
    --panel-border: #b3ddd6;
    --panel-shadow: rgba(13, 148, 136, 0.15);
    --header-border: #b3ddd6;
    --btn-bg: #d6f0eb;
    --btn-border: #8fccc2;
    --btn-text: #0b3a36;
    --field-bg: #ffffff;
    --field-text: #0b3a36;
    --console-bg: #e1f5f1;
    --console-text: #0b3a36;
    --error-bg: #fde8e8;
    --error-border: #f5b5b5;
    --error-text: #b91c1c;
    --accent: #0d9488;

    background: var(--bg);
    color: var(--text);
}

/* DARK variant of the Data Flow Diagram theme. */
:root[data-theme="dark"] .page.mode-dfd {
    --bg: #07171c;
    --text: #d7f3ee;
    --muted: #8fb3ad;
    --note: #7fa39d;
    --panel-bg: #0f242b;
    --panel-border: #1d4a52;
    --panel-shadow: rgba(0, 0, 0, 0.5);
    --header-border: #1d4a52;
    --btn-bg: #123038;
    --btn-border: #1f5560;
    --btn-text: #d7f3ee;
    --field-bg: #0b1f25;
    --field-text: #d7f3ee;
    --console-bg: #05161a;
    --console-text: #b8e6df;
    --error-bg: #3b1212;
    --error-border: #7f1d1d;
    --error-text: #fca5a5;
    --accent: #14b8a6;
}

.mode-select {
    gap: 6px;
}

.mode-select select {
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--btn-text);
    border-radius: 8px;
    padding: 6px 8px;
    font-weight: 600;
    cursor: pointer;
}

.mode-badge {
    display: inline-block;
    margin-left: 10px;
    padding: 2px 10px;
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
    background: var(--accent);
    border-radius: 999px;
    vertical-align: middle;
}

.dfd-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    padding: 12px 16px;
    background: var(--panel-bg);
    border: 1px solid var(--accent);
    border-radius: 14px;
    box-shadow: 0 8px 24px var(--panel-shadow);
}

.dfd-bar .dfd-title {
    font-weight: 700;
    margin-right: 4px;
    color: var(--accent);
}

.dfd-bar button {
    padding: 7px 11px;
    border-radius: 8px;
}

.dfd-sep {
    width: 1px;
    align-self: stretch;
    background: var(--panel-border);
    margin: 0 4px;
}

.dfd-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-left: auto;
    font-size: 13px;
    color: var(--muted);
    align-items: center;
}

.dfd-legend code {
    background: var(--field-bg);
    color: var(--field-text);
    padding: 2px 6px;
    border-radius: 6px;
    border: 1px solid var(--panel-border);
}

.dfd-legend .swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 6px;
    vertical-align: middle;
    border: 1px solid var(--accent);
}

.dfd-legend .swatch.entity {
    border-radius: 2px;
}

.dfd-legend .swatch.process {
    border-radius: 2px;
    box-shadow: inset 3px 0 0 var(--accent), inset -3px 0 0 var(--accent);
}

.dfd-legend .swatch.store {
    border-radius: 50% / 30%;
}

.dfd-legend .swatch.flow {
    border: 0;
    height: 0;
    border-top: 2px solid var(--accent);
    width: 16px;
}

.dfd-legend-panel {
    margin-bottom: 16px;
    padding: 12px 16px;
    background: var(--panel-bg);
    border: 1px solid var(--accent);
    border-radius: 14px;
    box-shadow: 0 8px 24px var(--panel-shadow);
}

.dfd-legend-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.dfd-legend-head .dfd-title {
    color: var(--accent);
}

.dfd-legend-actions {
    display: inline-flex;
    gap: 8px;
    margin-left: auto;
}

.dfd-legend-actions button {
    padding: 7px 11px;
    border-radius: 8px;
}

.dfd-legend-text {
    width: 100%;
    min-height: 96px;
    box-sizing: border-box;
    padding: 10px 12px;
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    resize: vertical;
    font-family: Consolas, Monaco, monospace;
    font-size: 13px;
    line-height: 1.5;
    background: var(--field-bg);
    color: var(--field-text);
    outline: none;
}

.page {
    min-height: 100vh;
    padding: 24px;
    box-sizing: border-box;
}

.header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    margin-bottom: 16px;
}

.header h1 {
    margin: 0 0 4px 0;
    font-size: 28px;
}

.header p {
    margin: 0;
    color: var(--muted);
}

.toolbar {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

button, .toggle {
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--btn-text);
    border-radius: 10px;
    padding: 10px 12px;
    font-weight: 600;
    cursor: pointer;
}

.toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.grid {
    display: grid;
    grid-template-columns: var(--source-width, 42%) 10px 1fr;
    gap: 16px;
    align-items: stretch;
}

/* Draggable divider between the source and preview panels. Dragging it adjusts
   --source-width on .grid, growing one panel as the other shrinks. */
.grid-resizer {
    align-self: stretch;
    width: 10px;
    cursor: col-resize;
    border-radius: 6px;
    background: var(--panel-border);
    opacity: 0.5;
    transition: opacity 0.15s ease, background 0.15s ease;
    touch-action: none;
}

.grid-resizer:hover {
    opacity: 1;
    background: var(--accent);
}

.grid-resizer.dragging {
    opacity: 1;
    background: var(--accent);
}

body.grid-resizing {
    cursor: col-resize;
    user-select: none;
}

.panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 24px var(--panel-shadow);
}

.console-panel {
    margin-top: 16px;
}

.panel-header {
    padding: 14px 16px;
    border-bottom: 1px solid var(--header-border);
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.preview-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.preview-actions button,
.preview-actions .toggle {
    height: 32px;
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 0 10px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
}

.preview-actions .icon-btn {
    padding: 0 8px;
    line-height: 0;
}

textarea {
    width: 100%;
    min-height: 72vh;
    border: 0;
    padding: 16px;
    box-sizing: border-box;
    resize: vertical;
    font-family: Consolas, Monaco, monospace;
    font-size: 14px;
    line-height: 1.45;
    outline: none;
    background: var(--field-bg);
    color: var(--field-text);
}

.console-output {
    min-height: 180px;
    max-height: 300px;
    border-top: 1px solid var(--header-border);
    background: var(--console-bg);
    color: var(--console-text);
}

.preview-wrap {
    min-height: 72vh;
    padding: 18px;
    overflow: hidden;
    position: relative;
    cursor: grab;
    touch-action: none;
    user-select: none;
}

.preview-wrap.dragging {
    cursor: grabbing;
}

/* ----- Fullscreen preview panel ----- */
#previewPanel:fullscreen {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    background: var(--bg);
}

#previewPanel:fullscreen .preview-wrap {
    flex: 1 1 auto;
    min-height: 0;
}

#diagramPreview svg {
    display: block;
}

#diagramPreview {
    position: relative;
    min-height: 100%;
}

/* Nodexr-style interaction layer */
#interactionLayer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 4;
}

#interactionLayer.controls-hidden {
    display: none;
}

/* ----- Paint bucket color bar (bottom of preview) ----- */
#colorBar {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 26px;
    display: flex;
    align-items: stretch;
    pointer-events: auto;
    z-index: 5;
    border-top: 1px solid var(--panel-border);
    background: var(--panel-bg);
    box-shadow: 0 -4px 12px var(--panel-shadow);
}

#colorBar.colors-hidden {
    display: none;
}

.color-swatch {
    flex: 1 1 0;
    min-width: 0;
    height: 100%;
    padding: 0;
    margin: 0;
    border: none;
    border-right: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: 0;
    cursor: pointer;
}

.color-swatch:last-child {
    border-right: none;
}

.color-swatch:hover {
    outline: 2px solid #2563eb;
    outline-offset: -2px;
    z-index: 1;
}

.color-swatch.selected {
    outline: 3px solid #111827;
    outline-offset: -3px;
    z-index: 2;
}

/* The most recently selected color stays clearly outlined at all times, even after
   the paint bucket has been applied, until a different color is picked. A strong
   outline plus a light inner ring keeps it visible on any swatch hue. */
.color-swatch.last-selected {
    outline: 3px solid #111827;
    outline-offset: -3px;
    box-shadow: inset 0 0 0 2px #ffffff;
    z-index: 3;
}

#interactionLayer.painting .node-overlay {
    cursor: crosshair;
}

/* While a paint color is armed, the delete buttons must not intercept clicks meant
   for the arrows/nodes underneath, so the paint bucket can reach the edge hit paths. */
#interactionLayer.painting .node-delete,
#interactionLayer.painting .edge-delete {
    pointer-events: none;
}

#noodleSvg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
    pointer-events: none;
    display: none;
}

#tempNoodle {
    fill: none;
    stroke: #2563eb;
    stroke-width: 2.5;
    stroke-dasharray: 6 4;
}

.node-overlay {
    position: absolute;
    box-sizing: border-box;
    border-radius: 6px;
    pointer-events: auto;
    cursor: crosshair;
}

.node-overlay:hover {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
    background: rgba(37, 99, 235, 0.06);
}

.node-overlay.connect-target {
    outline: 2px solid #16a34a;
    outline-offset: 2px;
    background: rgba(22, 163, 74, 0.12);
}

.node-delete {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 20px;
    height: 20px;
    padding: 0;
    line-height: 1;
    font-size: 13px;
    border-radius: 999px;
    border: 1px solid #b91c1c;
    background: #fff1f2;
    color: #991b1b;
    display: none;
    pointer-events: auto;
}

.node-overlay:hover .node-delete {
    display: block;
}

.edge-delete {
    position: absolute;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    padding: 0;
    line-height: 1;
    font-size: 13px;
    border-radius: 999px;
    border: 1px solid #b91c1c;
    background: #fff1f2;
    color: #991b1b;
    pointer-events: auto;
    opacity: 0.25;
    transition: opacity 0.15s ease;
}

.preview-wrap:hover .edge-delete {
    opacity: 0.85;
}

.edge-delete:hover {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.15);
}

/* Pulse the arrow whose delete button is being hovered, so it's obvious which
   connection is about to be removed. */
@keyframes edgeDeletePulse {
    0%, 100% { stroke: #ef4444; stroke-width: 4px; }
    50% { stroke: #b91c1c; stroke-width: 6px; }
}

#diagramPreview g.edgePaths > path.edge-highlight {
    stroke: #ef4444 !important;
    animation: edgeDeletePulse 0.7s ease-in-out infinite;
}

.node-label-editor {
    position: absolute;
    z-index: 6;
    min-width: 120px;
    border: 2px solid #2563eb;
    border-radius: 8px;
    padding: 6px 8px;
    font-size: 14px;
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.25);
    pointer-events: auto;
}

/* ----- Create-connected-node modal (drag into empty space) ----- */
.node-modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.45);
}

.node-modal {
    width: min(380px, 90vw);
    background: var(--panel-bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
    padding: 18px;
}

.node-modal-title {
    font-weight: 700;
    font-size: 16px;
    margin-bottom: 12px;
}

.node-modal-types {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.node-type-btn {
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--btn-text);
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

.node-type-btn.selected {
    border-color: var(--accent);
    background: var(--accent);
    color: #ffffff;
}

.node-modal-name {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--panel-border);
    background: var(--field-bg);
    color: var(--field-text);
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 14px;
    margin-bottom: 16px;
}

.node-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.node-modal-cancel,
.node-modal-create {
    border-radius: 8px;
    padding: 7px 14px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.node-modal-cancel {
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--btn-text);
}

.node-modal-create {
    border: 1px solid var(--accent);
    background: var(--accent);
    color: #ffffff;
}

#errorBox {
    color: var(--error-text);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: 10px;
    padding: 10px;
    margin-bottom: 12px;
    white-space: pre-wrap;
    display: none;
}

.small-note {
    color: var(--note);
    font-size: 13px;
}

@media (max-width: 900px) {
    .grid { grid-template-columns: 1fr; }
    .grid-resizer { display: none; }
}