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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ===== Styling Example palette (top bars) ===== */
:root {
    --se-panel: #262a33;
    --se-panel-2: #2d323d;
    --se-input: #1b1e25;
    --se-border: #3a4150;
    --se-txt: #e6e9ef;
    --se-txt-dim: #9aa3b2;
    --se-accent: #4c8bf5;
    --se-active: #0066cc;
    /* Interactive-accent for canvas selection (handles, attachment points,
       outlines), sliders, and the segmented controls. Tracks the theme's
       Device Color (set by the tint control); this is the classic-blue default. */
    --se-tint: #0066cc;
    /* Menu-bar mark port colors - brand blue/green by default; the warm
       themes override with tan pairs so the mark sits inside their palette. */
    --se-logo-a: #4c8bf5;
    --se-logo-b: #2e9b57;
    /* Dark-mode surfaces. The chrome vars above double as the dark
       sidebar/panel palette (one source of truth - themes recolor both);
       the canvas sits a shade darker so content still reads as "on paper". */
    --se-canvas-dark: #20222b;
    --se-grid-dark: #2f333f;
}

/* ===== Menu bar ===== */
#menubar {
    display: flex;
    align-items: center;
    gap: 14px;
    height: 42px;
    padding: 0 12px;
    background: var(--se-panel);
    border-bottom: 1px solid var(--se-border);
    color: var(--se-txt);
    position: relative;
    z-index: 200;
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 15px;
}

.brand .logo {
    /* The faceplate mark (inline SVG): the chassis stroke is currentColor so
       it follows the theme accent; the port colors are the fixed brand
       blue/green. */
    color: var(--se-accent);
    display: inline-flex;
    align-items: center;
}

.brand-name {
    letter-spacing: 0.2px;
}

.doc-name-input {
    width: 170px;
    padding: 3px 7px;
    background: var(--se-input);
    border: 1px solid var(--se-border);
    border-radius: 4px;
    color: var(--se-txt);
    font-size: 13px;
    font-weight: 400;
    font-family: inherit;
}

.doc-name-input:focus {
    outline: none;
    border-color: var(--se-accent);
}

.doc-version {
    display: flex;
    align-items: center;
    gap: 1px;
    font-size: 12px;
    color: var(--se-txt-dim);
}

.doc-version input {
    width: 44px;
    padding: 3px 4px;
    background: var(--se-input);
    border: 1px solid var(--se-border);
    border-radius: 4px;
    color: var(--se-txt);
    font-size: 12px;
    font-family: inherit;
    text-align: center;
    -moz-appearance: textfield;
}

.dirty-indicator {
    color: var(--se-accent);
    font-size: 15px;
    line-height: 1;
    display: none;
}

.dirty-indicator.visible {
    display: inline;
}

/* menus */
.menu {
    display: flex;
    align-items: stretch;
    gap: 2px;
    height: 100%;
}

.menu-item {
    position: relative;
    display: flex;
    align-items: center;
}

.menu-label {
    padding: 5px 11px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 13px;
    color: var(--se-txt);
}

.menu-item:hover .menu-label,
.menu-item.open .menu-label {
    background: var(--se-panel-2);
}

.menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 2px;
    min-width: 230px;
    padding: 5px 0;
    background: var(--se-panel);
    border: 1px solid var(--se-border);
    border-radius: 6px;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
    z-index: 300;
}

.menu-item.open .menu-dropdown {
    display: block;
}

.menu-dropdown button,
.menu-flyout button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 6px 14px;
    gap: 24px;
    border: none;
    background: none;
    color: var(--se-txt);
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    text-align: left;
}

.menu-dropdown button:hover,
.menu-flyout button:hover,
.menu-sub:hover > .has-sub {
    background: var(--se-accent);
    color: #fff;
}

.shortcut-key {
    color: var(--se-txt-dim);
    font-size: 11px;
}

.menu-dropdown button:hover .shortcut-key {
    color: rgba(255, 255, 255, 0.75);
}

.menu-separator {
    height: 1px;
    background: var(--se-border);
    margin: 4px 8px;
}

.menu-flyout button:disabled {
    opacity: 0.5;
    cursor: default;
}

.menu-flyout button:disabled:hover {
    background: none;
    color: var(--se-txt);
}

/* Canvas tier rows (Layers menu): per-tier visibility & lock */
.tier-header {
    padding: 2px 14px 4px;
    font-size: 10px;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--se-txt-dim);
}

.tier-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 14px;
    font-size: 13px;
    color: var(--se-txt);
}

.menu-dropdown .tier-row button {
    width: 22px;
    padding: 2px 0;
    justify-content: center;
    border-radius: 4px;
    font-size: 13px;
    line-height: 1;
    cursor: pointer;
}

.menu-dropdown .tier-row button:hover {
    background: var(--se-accent);
}

.tier-row .tier-lock { opacity: 0.35; }
.tier-row.tier-locked .tier-lock { opacity: 1; }
.tier-row.tier-hidden .tier-eye { opacity: 0.3; }
.tier-row.tier-hidden .tier-name { opacity: 0.45; }

/* Compact font blocks in the property panels */
.font-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.font-row + .font-row {
    margin-top: 6px;
}

.font-row select {
    flex: 1;
    min-width: 0;
}

.font-row .font-family-select {
    flex: 1.5;
}

/* App modal (native <dialog>) - themed replacement for alert()/prompt() */
#app-dialog {
    margin: auto;   /* re-center: the global margin reset clobbers the UA default */
    min-width: 320px;
    max-width: 460px;
    padding: 16px 18px;
    border: 1px solid var(--se-border);
    border-radius: 8px;
    background: var(--se-panel);
    color: var(--se-txt);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

#app-dialog::backdrop {
    background: rgba(0, 0, 0, 0.35);
}

/* Wide + tall variant for the Help documents */
#app-dialog.wide {
    max-width: 760px;
    width: 90vw;
}
#app-dialog.wide .dialog-body {
    max-height: 72vh;
}

/* Embedded Help / User Guide typography - self-contained, theme-aware */
.help-doc { font-size: 13px; line-height: 1.5; }
.help-nav {
    display: flex; flex-wrap: wrap; gap: 4px 14px;
    padding-bottom: 8px; margin-bottom: 10px;
    border-bottom: 1px solid var(--se-border);
    font-size: 12px;
}
.help-nav button {
    background: none; border: none; padding: 0; cursor: pointer;
    color: var(--se-accent); font-size: 12px; font-family: inherit;
}
.help-nav button:hover { text-decoration: underline; }
.help-nav span { font-weight: 600; font-size: 12px; }
.help-doc h4 {
    margin: 18px 0 6px;
    font-size: 14px;
    border-bottom: 1px solid var(--se-border);
    padding-bottom: 3px;
}
.help-doc h4:first-child { margin-top: 0; }
.help-doc p { margin: 6px 0; }
.help-doc ul, .help-doc ol { margin: 6px 0; padding-left: 22px; }
.help-doc li { margin: 3px 0; }
.help-doc kbd {
    font-family: Consolas, monospace;
    font-size: 12px;
    background: rgba(128, 128, 128, 0.18);
    border: 1px solid var(--se-border);
    border-radius: 4px;
    padding: 1px 5px;
    white-space: nowrap;
}
.help-doc code {
    font-family: Consolas, monospace;
    font-size: 12px;
    background: rgba(128, 128, 128, 0.15);
    border-radius: 3px;
    padding: 1px 4px;
}
.help-doc table {
    border-collapse: collapse;
    width: 100%;
    margin: 8px 0;
}
.help-doc th, .help-doc td {
    border: 1px solid var(--se-border);
    padding: 4px 8px;
    text-align: left;
    vertical-align: top;
}
.help-doc th { background: rgba(128, 128, 128, 0.12); font-weight: 600; }
.help-doc .help-lead { opacity: 0.8; }

#app-dialog .dialog-title {
    margin: 0 0 10px;
    font-size: 15px;
}

#app-dialog .dialog-body {
    font-size: 13px;
    line-height: 1.45;
    max-height: 55vh;
    overflow-y: auto;
}

#app-dialog .dialog-body .dialog-line {
    min-height: 1em;
}

#app-dialog .dialog-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 14px;
}

#app-dialog .dialog-btn {
    padding: 6px 14px;
    border: 1px solid var(--se-border);
    border-radius: 5px;
    background: transparent;
    color: inherit;
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
}

#app-dialog .dialog-btn:hover {
    background: rgba(128, 128, 128, 0.15);
}

#app-dialog .dialog-btn.primary {
    background: var(--se-accent);
    border-color: var(--se-accent);
    color: #fff;
}

#app-dialog .dialog-list-item {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px 10px;
    margin-top: 6px;
    border: 1px solid var(--se-border);
    border-radius: 6px;
    background: transparent;
    color: inherit;
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
}

#app-dialog .dialog-list-item:hover {
    background: var(--se-accent);
    border-color: var(--se-accent);
    color: #fff;
}

#app-dialog .dialog-list-item .dialog-item-note {
    opacity: 0.65;
    font-size: 12px;
}

/* Outranks the generic .panel-section input[type="color"] full-width rule */
.panel-section .font-row input[type="color"] {
    width: 34px;
    height: 26px;
    padding: 1px;
    flex: none;
}

/* Default Settings color bars match the Properties-panel look: a wide swatch
   stretching to the Reset button on the right edge */
#default-device-tint,
#default-device-bg,
#default-zone-fill,
#default-zone-border {
    flex: 1;
    height: 32px;
    padding: 1px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.mini-label {
    font-size: 11px;
    color: #888;
    flex: none;
}

.align-seg {
    display: flex;
    flex: 1;
    border: 1px solid rgba(128, 128, 128, 0.45);
    border-radius: 5px;
    overflow: hidden;
}

.align-seg button {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5px 0;
    border: none;
    background: transparent;
    color: inherit;
    cursor: pointer;
}

.align-seg button + button {
    border-left: 1px solid rgba(128, 128, 128, 0.3);
}

.align-seg button:hover {
    background: rgba(128, 128, 128, 0.18);
}

.align-seg button.active {
    background: var(--se-tint);
    color: #fff;
}

body.dark-mode .mini-label {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

/* submenus / flyouts */
.menu-sub {
    position: relative;
}

.sub-arrow {
    color: var(--se-txt-dim);
    font-size: 15px;
    line-height: 1;
}

.menu-sub:hover > .has-sub .sub-arrow {
    color: #fff;
}

.menu-flyout {
    display: none;
    position: absolute;
    top: -6px;
    left: 100%;
    min-width: 170px;
    padding: 5px 0;
    background: var(--se-panel);
    border: 1px solid var(--se-border);
    border-radius: 6px;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
}

.menu-sub:hover .menu-flyout {
    display: block;
}

.menu-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.topbar-btn {
    padding: 5px 12px;
    background: var(--se-panel-2);
    border: 1px solid var(--se-border);
    border-radius: 5px;
    color: var(--se-txt);
    font-size: 12px;
    font-family: inherit;
    cursor: pointer;
}

.topbar-btn:hover {
    background: #353b48;
    border-color: #4a5263;
}

#toolbar {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    background: var(--se-panel);
    border-bottom: 1px solid var(--se-border);
    gap: 4px;
    z-index: 100;
    flex-shrink: 0;
}

.tool-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--se-txt-dim);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.tool-btn:hover {
    background: var(--se-panel-2);
    color: var(--se-txt);
}

.tool-btn.active {
    background: var(--se-active, #0066cc);
    color: #fff;
}

/* Theme picker sits with the appearance controls (next to Dark) and wears
   the chrome palette it switches */
#theme-select {
    background: var(--se-input);
    color: var(--se-txt);
    border: 1px solid var(--se-border);
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 12px;
    cursor: pointer;
}
#theme-select:hover {
    border-color: var(--se-accent);
}

/* Collapsible panel sections (Device Properties / Device Details) share the
   sidebar section-header look (arrow left, rotate on collapse) */
#device-details-header {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px solid #ddd;
}
body.dark-mode #device-details-header {
    border-top-color: var(--se-dk-border, var(--se-border));
}
.device-field-row {
    margin-bottom: 4px;
}
.device-field-row .device-field-key,
.device-field-row .device-field-value {
    flex: 1;
    min-width: 0;
    width: auto;
}
.device-field-row .device-field-name {
    flex: 1;
    min-width: 0;
    font-size: 12px;
    color: #666;
}
body.dark-mode .device-field-row .device-field-name {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}
.device-field-row .device-field-remove {
    border: none;
    background: none;
    color: #999;
    cursor: pointer;
    font-size: 13px;
    padding: 0 2px;
}
.device-field-row .device-field-remove:hover {
    color: #d9534f;
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--se-border);
    margin: 0 6px;
}

.doc-version input::-webkit-inner-spin-button,
.doc-version input::-webkit-outer-spin-button {
    opacity: 1;
}

#sidebar {
    position: fixed;
    left: 0;
    top: 92px; /* menubar (43px) + toolbar (49px) */
    bottom: 0;
    width: 240px;
    background: #f5f5f5;
    border-right: 1px solid #ddd;
    padding: 12px;
    overflow-y: auto;
    z-index: 50;
}

#sidebar h3 {
    font-size: 13px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

#device-search {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    margin-bottom: 10px;
    background: white;
}

.default-size-control {
    margin-bottom: 8px;
}

.default-size-control label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: #666;
    margin-bottom: 2px;
}

.default-size-control input[type="range"] {
    width: 100%;
}

/* Range sliders take the theme accent (they'd otherwise show the browser's
   default blue, which fights warm themes like Parchment). */
input[type="range"] {
    accent-color: var(--se-tint);
}

#device-list,
#shape-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

/* Category groups inside the device palette. The group is a full-width row
   of the flex container; its own grid repeats the palette's flex layout. */
.stencil-cat {
    flex-basis: 100%;
}

.stencil-cat-header {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: #777;
    margin: 2px 0 6px;
}

.stencil-cat-header:hover {
    color: #333;
}

.stencil-cat-header.collapsed .collapse-arrow {
    transform: rotate(-90deg);
}

.stencil-cat-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
}

body.dark-mode #sidebar .stencil-cat-header {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

body.dark-mode #sidebar .stencil-cat-header:hover {
    color: var(--se-dk-txt, var(--se-txt));
}

.device-thumb {
    width: 60px;
    height: 60px;
    /* The bundled icons are borderless glyphs - the thumb draws the set's
       frame (blue rounded border on white), like the canvas renderer does */
    border: 3px solid rgb(45, 103, 185);
    border-radius: 8px;
    background: rgb(255, 254, 254);
    cursor: grab;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: border-color 0.15s;
}

.device-thumb:hover {
    border-color: var(--se-tint);
}

.device-thumb-wrapper {
    position: relative;
}

.device-delete-btn {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: none;
    background: #d9534f;
    color: white;
    font-size: 10px;
    line-height: 16px;
    text-align: center;
    cursor: pointer;
    padding: 0;
    display: none;
    z-index: 1;
}

.device-thumb-wrapper:hover .device-delete-btn {
    display: block;
}

.device-thumb img {
    max-width: 50px;
    max-height: 50px;
    object-fit: contain;
}

.sidebar-btn {
    width: 100%;
    padding: 8px;
    border: 2px dashed #ccc;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    color: #666;
    transition: all 0.15s;
}

.sidebar-btn:hover {
    border-color: var(--se-tint);
    color: var(--se-tint);
}

.panel-section {
    margin-bottom: 12px;
}

.panel-section label {
    display: block;
    font-size: 12px;
    color: #666;
    margin-bottom: 4px;
}

.panel-section select,
.panel-section input[type="text"],
.panel-section input[type="number"] {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    background: white;
}

/* Batch-edit panel: per-type sections, each a labelled group of controls. */
.batch-group {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid rgba(128, 128, 128, 0.3);
}
.batch-group h4 {
    margin: 0 0 8px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    opacity: 0.75;
}

/* Dashed outline drawn around a fully-selected group */
.group-outline {
    fill: none;
    stroke: #7c4dff;
    stroke-width: 1.5;
    stroke-dasharray: 6 4;
    pointer-events: none;
}

/* Alignment guide lines shown while dragging with guides enabled */
.align-guide {
    stroke: #e91e63;
    stroke-width: 1;
    stroke-dasharray: 4 3;
    pointer-events: none;
}

/* Right-click context menu */
.context-menu, .context-flyout {
    position: fixed;
    z-index: 10000;
    min-width: 180px;
    background: #fff;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
    padding: 4px;
    font-size: 13px;
    user-select: none;
}
.context-flyout { position: absolute; top: -5px; left: 100%; }
.context-item {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    color: #222;
}
.context-item:hover { background: #eef2f7; }
.context-item.disabled { color: #aaa; cursor: default; }
.context-item.disabled:hover { background: transparent; }
.context-sep { height: 1px; background: rgba(0, 0, 0, 0.1); margin: 4px 6px; }
.context-arrow { opacity: 0.6; }
.context-key { margin-left: auto; padding-left: 28px; opacity: 0.5; font-size: 12px; }
.context-item.has-sub > .context-flyout { display: none; }
.context-item.has-sub:hover > .context-flyout { display: block; }

body.dark-mode .context-menu, body.dark-mode .context-flyout {
    background: var(--se-dk-panel-2, var(--se-panel-2));
    border-color: var(--se-dk-border, var(--se-border));
    color: var(--se-dk-txt, var(--se-txt));
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}
body.dark-mode .context-item { color: var(--se-txt); }
body.dark-mode .context-item:hover { background: var(--se-border); }
body.dark-mode .context-item.disabled { color: #6a6a80; }
body.dark-mode .context-sep { background: rgba(255, 255, 255, 0.12); }

.panel-section input[type="color"] {
    width: 100%;
    height: 32px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    padding: 2px;
}

.small-btn {
    padding: 4px 8px;
    border: 1px solid #ddd;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    margin-left: 8px;
}

.small-btn:hover {
    background: #e8e8e8;
}

#ap-count {
    font-size: 13px;
    font-weight: 600;
}

#canvas-container {
    flex: 1;
    margin-left: 240px;
    margin-top: 0;
    overflow: auto;
    position: relative;
    user-select: none;
}

#canvas-container.pan-mode {
    cursor: grab;
}

#canvas-container.pan-mode.panning {
    cursor: grabbing;
}

/* Armed text tool: the next canvas click places a text box */
#canvas-container.text-mode,
#canvas-container.text-mode svg,
#canvas-container.text-mode svg * {
    cursor: text;
}

#canvas {
    display: block;
}

.toolbar-zoom {
    color: #ccc;
    font-size: 12px;
    min-width: 42px;
    text-align: center;
    cursor: pointer;
    user-select: none;
    padding: 0 2px;
}

.tool-btn.zoom-btn {
    font-size: 18px;
    font-weight: bold;
    line-height: 1;
}

.toolbar-zoom:hover {
    color: #fff;
}

.device-node {
    cursor: move;
}

.device-selection-outline {
    display: none;
    pointer-events: none;
}

.device-node.selected .device-selection-outline,
.device-node.multi-selected .device-selection-outline {
    display: block;
    stroke: var(--se-tint);
    stroke-width: 2;
    stroke-dasharray: 4 2;
}

.attachment-point {
    fill: var(--se-tint);
    stroke: white;
    stroke-width: 2;
    cursor: crosshair;
    opacity: 0;
    transition: opacity 0.15s;
}

.device-node:hover .attachment-point,
.device-node.selected .attachment-point,
.zone-node:hover .attachment-point,
.zone-node.selected .attachment-point,
.image-node:hover .attachment-point,
.image-node.selected .attachment-point {
    opacity: 1;
}

.attachment-point:hover {
    fill: #ff4444;
    transform-origin: center;
}

.connection-line {
    fill: none;
    cursor: pointer;
}

.connection-line:hover {
    filter: drop-shadow(0 0 3px rgba(0, 102, 204, 0.5));
}

.connection-line.selected {
    filter: drop-shadow(0 0 4px rgba(0, 102, 204, 0.8));
}

.temp-line {
    fill: none;
    stroke: var(--se-tint);
    stroke-width: 2;
    stroke-dasharray: 5 3;
    pointer-events: none;
}

.scale-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.scale-controls .small-btn {
    width: 28px;
    height: 28px;
    padding: 0;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    line-height: 26px;
    margin-left: 0;
}

#device-w-input,
#device-h-input {
    width: 54px;
    padding: 4px 6px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
}

.sidebar-section {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid #ddd;
}

.sidebar-section:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.section-header {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 4px;
}

.section-header:hover {
    color: #333;
}

.collapse-arrow {
    font-size: 9px;
    transition: transform 0.2s;
    display: inline-block;
}

.section-header.collapsed .collapse-arrow {
    transform: rotate(-90deg);
}

.section-content {
    overflow: hidden;
    transition: max-height 0.25s ease;
}

.section-content.collapsed {
    max-height: 0 !important;
    overflow: hidden;
}

#textbox-panel {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid #ddd;
}

.rich-label-editor {
    width: 100%;
    min-height: 2.6em;
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    font-family: inherit;
    background: white;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-y: auto;
    max-height: 120px;
    cursor: text;
    user-select: text;
}

.rich-label-editor:focus {
    outline: 2px solid var(--se-tint);
    outline-offset: -1px;
}

.rich-label-editor:empty::before {
    content: attr(data-placeholder);
    color: #999;
    pointer-events: none;
}

.shape-thumb {
    cursor: grab;
}

.zone-node {
    cursor: move;
}

.zone-node.selected .zone-shape,
.zone-node.multi-selected .zone-shape {
    stroke-dasharray: 6 3;
}

.zone-resize-handle {
    fill: white;
    stroke: var(--se-tint);
    stroke-width: 1.5;
    opacity: 0;
}

.zone-node.selected .zone-resize-handle {
    opacity: 1;
}

.device-resize-handle {
    fill: white;
    stroke: var(--se-tint);
    stroke-width: 1.5;
    cursor: nwse-resize;
    opacity: 0;
}

.device-node.selected .device-resize-handle,
.device-node:hover .device-resize-handle {
    opacity: 1;
}

/* Connect mode is about wiring, not sizing: hide the resize handles so they
   don't sit on top of the attachment points (making the small AP dots hard to
   hit) or intercept a connect-drag. They return the moment you're in select. */
#canvas-container.connect-mode .device-resize-handle,
#canvas-container.connect-mode .zone-resize-handle,
#canvas-container.connect-mode .image-resize-handle {
    display: none;
}

.panel-section input[type="range"] {
    width: 100%;
}

#zone-panel {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid #ddd;
}

.marquee-rect {
    fill: color-mix(in srgb, var(--se-tint) 10%, transparent);
    stroke: var(--se-tint);
    stroke-width: 1;
    stroke-dasharray: 4 2;
    pointer-events: none;
}


.conn-bend-handle {
    fill: white;
    stroke: var(--se-tint);
    stroke-width: 1.5;
    opacity: 0.9;
}

.conn-bend-handle:hover {
    fill: #cce0ff;
    stroke: #0044aa;
}

.conn-endpoint-handle {
    fill: var(--se-tint);
    stroke: white;
    stroke-width: 2;
    opacity: 0.9;
    cursor: grab;
}

.conn-endpoint-handle:hover {
    fill: #ff4444;
}

.textbox-node {
    cursor: move;
}

.textbox-node.selected .textbox-border {
    stroke: var(--se-tint);
    stroke-width: 1.5;
    stroke-dasharray: 4 2;
}

.textbox-node.multi-selected .textbox-border {
    stroke: var(--se-tint);
    stroke-width: 1.5;
    stroke-dasharray: 4 2;
}

.image-node {
    cursor: move;
}

.image-node.selected .image-border {
    stroke: var(--se-tint);
    stroke-width: 2;
    stroke-dasharray: 4 2;
}

.image-resize-handle {
    fill: white;
    stroke: var(--se-tint);
    stroke-width: 1.5;
    cursor: nwse-resize;
    opacity: 0;
}

.image-node.selected .image-resize-handle {
    opacity: 1;
}

#connection-panel,
#device-panel {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid #ddd;
}

.connection-annotation,
.connection-annotation-bg {
    cursor: grab;
}

.inline-editor {
    position: absolute;
    min-width: 40px;
    min-height: 1em;
    outline: 2px solid var(--se-tint);
    border-radius: 2px;
    background: white;
    padding: 2px 4px;
    font-family: sans-serif;
    white-space: pre-wrap;
    word-wrap: break-word;
    z-index: 200;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    user-select: text;
    cursor: text;
}

/* ===== Dark mode (left sidebar + canvas) - Menu Example palette ===== */
body.dark-mode #sidebar {
    background: var(--se-dk-panel, var(--se-panel));
    border-right-color: var(--se-dk-border, var(--se-border));
    color: var(--se-dk-txt, var(--se-txt));
}

body.dark-mode #sidebar h3,
body.dark-mode #sidebar label,
body.dark-mode #sidebar .section-header,
body.dark-mode #sidebar .default-size-control label {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

body.dark-mode #sidebar input[type="text"],
body.dark-mode #sidebar input[type="number"],
body.dark-mode #sidebar input[type="search"],
body.dark-mode #sidebar select,
body.dark-mode #sidebar textarea,
body.dark-mode #sidebar .rich-label-editor,
body.dark-mode #device-search {
    background: var(--se-dk-input, var(--se-input));
    color: var(--se-dk-txt, var(--se-txt));
    border-color: var(--se-dk-border, var(--se-border));
}

body.dark-mode #sidebar .sidebar-btn,
body.dark-mode #sidebar .small-btn {
    background: var(--se-dk-panel-2, var(--se-panel-2));
    color: var(--se-dk-txt, var(--se-txt));
    border-color: var(--se-dk-border, var(--se-border));
}

body.dark-mode #sidebar .sidebar-btn:hover,
body.dark-mode #sidebar .small-btn:hover {
    background: var(--se-dk-border, var(--se-border));
}

body.dark-mode #sidebar .sidebar-section,
body.dark-mode #sidebar #zone-panel,
body.dark-mode #sidebar #textbox-panel,
body.dark-mode #sidebar #connection-panel,
body.dark-mode #sidebar #device-panel,
body.dark-mode #sidebar #image-panel {
    border-color: var(--se-dk-border, var(--se-border));
}

/* keep device thumbnails light so icons stay legible */
body.dark-mode #sidebar .device-thumb {
    background: #fff;
    border-color: var(--se-dk-border, var(--se-border));
}

body.dark-mode #canvas-container {
    background: var(--se-canvas-dark);
}

body.dark-mode #canvas-bg {
    fill: var(--se-canvas-dark);
}

body.dark-mode #grid-line {
    stroke: var(--se-grid-dark);
}

/* Flip black/near-black device labels to white for legibility on the dark canvas */
body.dark-mode .device-label-adaptive {
    fill: #ffffff;
}

.panel-hint {
    margin-top: 10px;
    font-size: 11px;
    line-height: 1.45;
    color: #888;
}

.panel-hint kbd {
    font-family: inherit;
    font-size: 10px;
    background: #eee;
    border: 1px solid #ccc;
    border-radius: 3px;
    padding: 0 4px;
    color: #555;
}

body.dark-mode .panel-hint {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

body.dark-mode .panel-hint kbd {
    background: var(--se-dk-panel-2, var(--se-panel-2));
    border-color: var(--se-dk-border, var(--se-border));
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

/* ===== Right-side Properties pane ===== */
#right-pane {
    position: fixed;
    right: 0;
    top: 92px; /* menubar (43px) + toolbar (49px) */
    bottom: 0;
    width: 260px;
    background: #f5f5f5;
    border-left: 1px solid #ddd;
    padding: 12px;
    overflow-y: auto;
    z-index: 50;
    display: none;
}

#right-pane.visible {
    display: block;
}

body.right-pane-open #canvas-container {
    margin-right: 260px;
}

/* Panel header styling works wherever the host lives (sidebar or right pane) */
#properties-host h3 {
    font-size: 13px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

/* In the right pane a panel is shown on its own, so drop the divider that
   separated it from the device library in the left sidebar */
#right-pane #device-panel,
#right-pane #zone-panel,
#right-pane #textbox-panel,
#right-pane #connection-panel {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

/* Dark mode for the right pane + the movable property panels */
body.dark-mode #right-pane {
    background: var(--se-dk-panel, var(--se-panel));
    border-left-color: var(--se-dk-border, var(--se-border));
    color: var(--se-dk-txt, var(--se-txt));
}

body.dark-mode #properties-host h3,
body.dark-mode #properties-host label {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

body.dark-mode #properties-host input[type="text"],
body.dark-mode #properties-host input[type="number"],
body.dark-mode #properties-host select,
body.dark-mode #properties-host textarea,
body.dark-mode #properties-host .rich-label-editor {
    background: var(--se-dk-input, var(--se-input));
    color: var(--se-dk-txt, var(--se-txt));
    border-color: var(--se-dk-border, var(--se-border));
}

body.dark-mode #properties-host .small-btn {
    background: var(--se-dk-panel-2, var(--se-panel-2));
    color: var(--se-dk-txt, var(--se-txt));
    border-color: var(--se-dk-border, var(--se-border));
}

body.dark-mode #properties-host .small-btn:hover {
    background: var(--se-dk-border, var(--se-border));
}

/* --- Find on canvas (Ctrl+F) --- */
#canvas-find {
    position: fixed;
    left: 252px;
    top: 104px;
    z-index: 900;
    display: flex;
    gap: 6px;
    align-items: center;
    background: var(--se-panel);
    border: 1px solid var(--se-border);
    border-radius: 6px;
    padding: 5px 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}
#canvas-find input {
    width: 180px;
    background: var(--se-input);
    color: var(--se-txt);
    border: 1px solid var(--se-border);
    border-radius: 4px;
    padding: 3px 6px;
    font-size: 13px;
}
#canvas-find-count {
    font-size: 12px;
    color: var(--se-txt-dim);
    min-width: 34px;
    text-align: right;
}
body.dark-mode #canvas-find {
    background: var(--se-dk-panel, var(--se-panel));
    border-color: var(--se-dk-border, var(--se-border));
}
body.dark-mode #canvas-find input {
    background: var(--se-dk-input, var(--se-input));
    color: var(--se-dk-txt, var(--se-txt));
    border-color: var(--se-dk-border, var(--se-border));
}
body.dark-mode #canvas-find-count {
    color: var(--se-dk-txt-dim, var(--se-txt-dim));
}

/* Icon-filter inputs above the icon-swap selects */
.icon-filter {
    width: 100%;
    margin-bottom: 4px;
}

/* Locked right pane, nothing selected */
#right-pane-hint {
    padding: 18px 14px;
    font-size: 12px;
    color: var(--se-txt-dim);
    text-align: center;
}