/**
 * AlgoLab — Editor de algoritmos gráficos (ISO 5807 / ANSI)
 * Archivo: styles.css
 * Identidad visual: tecnoLSM PRINCIPAL (oscuro/técnico con variante clara)
 */

/* ==========================================================================
   1. VARIABLES Y TOKENS DE MARCA (tecnoLSM PRINCIPAL)
   ========================================================================== */

:root {
  color-scheme: dark;

  /* Paleta OKLCH y RGB Sistema Principal (Oscuro técnico por defecto) */
  --bg-rgb: 11 17 30;               /* #0B111E - Fondo dominante */
  --surface-rgb: 27 38 54;          /* #1B2636 - Superficie tarjetas/paneles */
  --surface2-rgb: 44 58 77;         /* #2C3A4D - Superficie elevada */
  --fg-rgb: 221 234 240;            /* #DDEAF0 - Texto principal */
  --muted-rgb: 148 169 184;         /* #94A9B8 - Texto secundario / muted */
  --border-rgb: 83 103 125;         /* #53677D - Separación estructural */
  
  --accent-rgb: 104 215 232;        /* #68D7E8 - Cian primary (interacción, foco) */
  --accent-hover-rgb: 226 122 179;  /* #E27AB3 - Magenta (hover y énfasis puntual) */
  --craft-rgb: 197 139 98;          /* #C58B62 - Cobre secondary (oficio, didáctica) */
  --danger-rgb: 228 130 120;        /* #E48278 - Rojo peligro / cancelar */
  --success-rgb: 106 203 154;       /* #6ACB9A - Verde éxito */
  --warning-rgb: 225 185 103;       /* #E1B967 - Ámbar advertencia */
  --blue-rgb: 91 141 239;           /* #5B8DEF - Azul */

  /* Colores computados */
  --bg: rgb(var(--bg-rgb));
  --surface: rgb(var(--surface-rgb));
  --surface2: rgb(var(--surface2-rgb));
  --fg: rgb(var(--fg-rgb));
  --muted: rgb(var(--muted-rgb));
  --border: rgb(var(--border-rgb));
  --accent: rgb(var(--accent-rgb));
  --accent-hover: rgb(var(--accent-hover-rgb));
  --craft: rgb(var(--craft-rgb));
  --danger: rgb(var(--danger-rgb));
  --success: rgb(var(--success-rgb));
  --warning: rgb(var(--warning-rgb));
  --blue: rgb(var(--blue-rgb));

  /* Tipografías oficiales */
  --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  /* Bordes redondeados y medidas */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 22px;

  /* Alturas fijas */
  --header-height: 60px;
  --toolbar-height: 52px;
  --footer-height: 48px;
}

/* Variante Clara (Trabajo / Impresión) */
[data-theme="light"] {
  color-scheme: light;

  --bg-rgb: 240 237 227;           /* Fondo cálido claro */
  --surface-rgb: 250 248 242;       /* Superficie clara */
  --surface2-rgb: 232 229 219;      /* Superficie 2 */
  --fg-rgb: 35 47 64;               /* Texto oscuro legible */
  --muted-rgb: 68 81 94;            /* Texto secundario */
  --border-rgb: 194 204 212;        /* Borde claro */

  --accent-rgb: 29 125 166;         /* Cian oscuro de alto contraste */
  --accent-hover-rgb: 176 75 126;   /* Magenta */
  --craft-rgb: 163 94 43;           /* Cobre */
  --danger-rgb: 179 58 51;          /* Rojo */
  --success-rgb: 40 140 95;
  --warning-rgb: 180 135 40;
  --blue-rgb: 50 100 200;

  --bg: rgb(var(--bg-rgb));
  --surface: rgb(var(--surface-rgb));
  --surface2: rgb(var(--surface2-rgb));
  --fg: rgb(var(--fg-rgb));
  --muted: rgb(var(--muted-rgb));
  --border: rgb(var(--border-rgb));
  --accent: rgb(var(--accent-rgb));
  --accent-hover: rgb(var(--accent-hover-rgb));
  --craft: rgb(var(--craft-rgb));
  --danger: rgb(var(--danger-rgb));
}

/* ==========================================================================
   2. RESET Y REGLAS BASE (Prohibido sombras y gradientes según brand)
   ========================================================================== */

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

html, body {
  width: 100%;
  height: 100%;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.4;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Prohibido sombras en todo el sistema principal */
* {
  box-shadow: none !important;
  text-shadow: none !important;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  user-select: none;
}

button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

iconify-icon {
  display: inline-block;
  font-size: 1.25rem;
  vertical-align: middle;
}

/* ==========================================================================
   3. CABECERA PRINCIPAL (APP-HEADER)
   ========================================================================== */

.app-header {
  height: var(--header-height);
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  gap: 16px;
  z-index: 50;
}

.header-brand-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 10px;
}

.wordmark-brand {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.wordmark-brand b {
  color: var(--accent);
  font-weight: 700;
}

.brand-divider {
  color: var(--border);
  font-size: 1.1rem;
  font-weight: 300;
  user-select: none;
}

.app-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.8rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fg);
  display: inline-flex;
  align-items: baseline;
}

.app-title-accent {
  color: var(--accent);
}

.badge-norm {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background-color: rgba(var(--accent-rgb), 0.15);
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), 0.35);
  text-transform: uppercase;
}

/* Toggle tema claro/oscuro (patrón oficial tecnoLSM) */
.theme-toggle {
  min-height: 32px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  background: var(--surface2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Cajetín de alumno con toque cobre brand (oficio / didáctica) */
.header-student-box {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg);
  border: 1px solid rgba(var(--craft-rgb), 0.45);
  border-radius: var(--radius-md);
  padding: 4px 12px;
  flex: 1;
  max-width: 540px;
}

.student-field {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.student-field-sm {
  flex: 0 0 110px;
}

.student-field-xs {
  flex: 0 0 80px;
}

.student-field label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--craft);
  white-space: nowrap;
}

.student-field input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(var(--border-rgb), 0.6);
  padding: 2px 4px;
  font-size: 0.85rem;
  color: var(--fg);
}

.student-field input:focus {
  outline: none;
  border-bottom-color: var(--craft);
}

/* Botones de acción de cabecera */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.btn {
  font-family: var(--font-body);
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background-color: var(--surface2);
  border: 1px solid var(--border);
  color: var(--fg);
}

.btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-sm {
  font-size: 0.82rem;
  padding: 5px 9px;
}

.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #0B111E;
  font-weight: 700;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0B111E;
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
}

.btn-danger {
  background-color: var(--danger);
  border-color: var(--danger);
  color: #0B111E;
  font-weight: 700;
}

/* ==========================================================================
   4. BARRA DE HERRAMIENTAS (TOOLBAR)
   ========================================================================== */

.app-toolbar {
  height: var(--toolbar-height);
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  z-index: 40;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background-color: var(--border);
  margin: 0 4px;
  flex-shrink: 0;
}

.toolbar-group-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 4px;
  user-select: none;
}

.tool-btn {
  padding: 5px 9px;
  font-size: 0.8rem;
  color: var(--fg);
  border: 1px solid var(--border);
  background-color: var(--surface);
  border-radius: var(--radius-sm);
}

.tool-btn.icon-only {
  padding: 6px;
  min-width: 32px;
}

.tool-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background-color: rgba(var(--accent-rgb), 0.08);
}

.tool-btn.active {
  background-color: rgba(var(--accent-rgb), 0.2);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.tool-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.tool-btn.btn-danger-hover:hover:not(:disabled) {
  border-color: var(--danger);
  color: var(--danger);
  background-color: rgba(var(--danger-rgb), 0.15);
}

/* ==========================================================================
   4.1 PANEL LATERAL IZQUIERDO DE PIEZAS NORMALIZADAS (SHAPES-SIDEBAR)
   ========================================================================== */

.shapes-sidebar {
  width: 145px;
  height: 100%;
  background-color: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 35;
  overflow-y: auto;
  scrollbar-width: thin;
}

.shapes-sidebar-header {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.3);
  display: flex;
  align-items: center;
  gap: 7px;
  background-color: var(--surface2);
  flex-shrink: 0;
}

.shapes-sidebar-header iconify-icon {
  font-size: 1.1rem;
  color: var(--accent);
}

.shapes-sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  user-select: none;
}

.shapes-sidebar-content {
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.shapes-sidebar .shape-btn {
  width: 100%;
  padding: 6px 8px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: var(--radius-sm);
  font-size: 0.76rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.1s ease, color 0.15s ease;
  user-select: none;
}

.shapes-sidebar .shape-btn .shape-icon {
  width: 22px;
  height: 14px;
  flex-shrink: 0;
  color: var(--accent);
}

.shapes-sidebar .shape-btn:hover {
  border-color: var(--accent);
  background-color: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
  transform: translateX(2px);
}

.shapes-sidebar .shape-btn:active {
  transform: scale(0.98);
}

/* Compatibilidad si se usan fuera de sidebar */
.shape-btn {
  padding: 4px 7px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.shape-btn .shape-icon {
  width: 22px;
  height: 14px;
  flex-shrink: 0;
}

.shape-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.shape-btn:active {
  transform: translateY(1px);
}

/* Botón indicador de zoom */
.zoom-level-btn {
  min-width: 50px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
}

/* ==========================================================================
   5. ÁREA DE TRABAJO Y LIENZO SVG
   ========================================================================== */

.editor-workspace {
  display: flex;
  height: calc(100vh - var(--header-height) - var(--toolbar-height) - var(--footer-height));
  position: relative;
  overflow: hidden;
  background-color: var(--bg);
}

.canvas-wrapper {
  flex: 1;
  height: 100%;
  position: relative;
  overflow: hidden;
  outline: none;
  background-color: var(--bg);
  cursor: default;
}

.canvas-wrapper.mode-pan {
  cursor: grab;
}

.canvas-wrapper.mode-panning {
  cursor: grabbing;
}

.canvas-wrapper.mode-arrow {
  cursor: crosshair;
}

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

/* Cuadrícula del lienzo (div HTML sobre el SVG). No se usa <pattern> SVG: los estilos
   no se aplican a los elementos internos de <defs>/<pattern> en todos los motores y
   quedaban invisibles. Esta versión CSS se ve SIEMPRE, en ambos temas. */
.grid-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(148, 169, 184, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148, 169, 184, 0.45) 1px, transparent 1px);
  background-size: 20px 20px;
}

[data-theme="light"] .grid-layer {
  background-image:
    linear-gradient(to right, rgba(83, 103, 125, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(83, 103, 125, 0.45) 1px, transparent 1px);
}

.canvas-wrapper > svg {
  position: relative;
  z-index: 1;
}

.grid-layer.hidden {
  display: none;
}

/* Formas y elementos SVG en el lienzo */
.svg-box-group {
  cursor: move;
}

.svg-box-shape {
  transition: stroke 0.15s ease;
  vector-effect: non-scaling-stroke;
}

.svg-box-group:hover .svg-box-shape {
  stroke-width: 2.5;
}

.svg-box-group.selected .svg-box-shape {
  stroke: var(--accent) !important;
  stroke-width: 2.5;
}

.svg-box-text {
  font-family: var(--font-body);
  user-select: none;
  pointer-events: none;
  text-anchor: middle;
}

/* Handles de redimensionado (8 handles) */
.resize-handle {
  fill: var(--bg);
  stroke: var(--accent);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
  cursor: pointer;
}

.resize-handle:hover {
  fill: var(--accent);
}

.resize-handle.nw, .resize-handle.se { cursor: nwse-resize; }
.resize-handle.ne, .resize-handle.sw { cursor: nesw-resize; }
.resize-handle.n,  .resize-handle.s  { cursor: ns-resize; }
.resize-handle.e,  .resize-handle.w  { cursor: ew-resize; }

.selection-bbox {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1;
  stroke-dasharray: 4, 3;
  pointer-events: none;
}

/* Flechas y conectores */
.svg-arrow-group {
  cursor: pointer;
}

.svg-arrow-path {
  fill: none;
  vector-effect: non-scaling-stroke;
}

.svg-arrow-hitbox {
  fill: none;
  stroke: transparent;
  stroke-width: 14;
  cursor: pointer;
}

.svg-arrow-group:hover .svg-arrow-path {
  stroke: var(--accent-hover) !important;
}

.svg-arrow-group.selected .svg-arrow-path {
  stroke: var(--accent) !important;
  stroke-width: 3 !important;
}

/* Etiquetas de flechas */
.arrow-label-group {
  cursor: grab;
  user-select: none;
}

.arrow-label-bg {
  fill: var(--surface);
  stroke: var(--border);
  stroke-width: 1;
  rx: 4;
}

.arrow-label-group:hover .arrow-label-bg {
  stroke: var(--accent);
}

.arrow-label-text {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  fill: var(--fg);
}

/* Hilo punteado de comentarios */
.comment-lead-line {
  stroke: var(--craft);
  stroke-width: 1.5;
  stroke-dasharray: 4, 3;
  pointer-events: none;
}

/* Chips y paneles de comentarios acordeón dentro de foreignObject */
.comment-fo-container {
  overflow: visible;
}

.comment-chip {
  height: 28px;
  background-color: var(--surface);
  border: 1px solid var(--craft);
  border-radius: var(--radius-sm);
  color: var(--fg);
  padding: 0 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}

.comment-chip iconify-icon {
  font-size: 1rem;
  color: var(--craft);
}

.comment-chip-snippet {
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 120px;
}

.comment-panel {
  background-color: var(--surface);
  border: 1px solid var(--craft);
  border-radius: var(--radius-md);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 260px;
  max-width: 320px;
}

.comment-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(var(--border-rgb), 0.5);
  padding-bottom: 4px;
  cursor: grab;
  user-select: none;
}

.comment-panel-header:active {
  cursor: grabbing;
}

.comment-panel-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--craft);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 4px;
}

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

.comment-icon-btn {
  padding: 2px 4px;
  font-size: 0.85rem;
  color: var(--muted);
  border-radius: 4px;
  cursor: pointer;
}

.comment-icon-btn:hover {
  color: var(--accent);
  background: var(--surface2);
}

.comment-textarea {
  width: 100%;
  min-height: 60px;
  max-height: 240px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  padding: 6px;
  font-size: 0.8rem;
  resize: vertical;
}

.comment-textarea:focus {
  outline: none;
  border-color: var(--craft);
}

/* Overlay HTML para edición directa in-situ */
.text-editor-overlay {
  position: absolute;
  z-index: 100;
}

.text-editor-overlay textarea {
  width: 100%;
  height: 100%;
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--fg);
  font-family: var(--font-body);
  padding: 6px;
  text-align: center;
  resize: none;
  outline: none;
}

/* Banner de ayuda modo flecha */
.arrow-guide-banner {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--surface);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 6px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  z-index: 80;
}

.btn-banner-cancel {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.btn-banner-cancel:hover {
  background-color: var(--danger);
  color: #0B111E;
}

/* ==========================================================================
   6. PANEL DE PROPIEDADES CONTEXTUAL (LATERAL DERECHO)
   ========================================================================== */

.properties-panel {
  width: 320px;
  height: 100%;
  background-color: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 30;
  overflow-y: auto;
  transition: width 0.2s ease;
}

.properties-panel.collapsed {
  display: none !important;
}

/* Botón flotante para re-desplegar panel de ayuda */
.btn-floating-help {
  position: absolute;
  top: 14px;
  right: 16px;
  z-index: 45;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background-color: var(--surface2);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.btn-floating-help:hover {
  background-color: rgba(var(--accent-rgb), 0.2);
  transform: translateY(-1px);
}

.btn-floating-help iconify-icon {
  font-size: 1.15rem;
}

.panel-header {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.3);
  background-color: var(--surface2);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
}

.panel-close-btn {
  padding: 4px;
  color: var(--muted);
  border-radius: var(--radius-sm);
}

.panel-close-btn:hover {
  color: var(--accent-hover);
  background-color: var(--surface);
}

.panel-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.prop-section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.prop-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--craft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.prop-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.prop-input {
  width: 100%;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  padding: 6px 8px;
  font-size: 0.85rem;
}

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

.prop-textarea {
  min-height: 60px;
  resize: vertical;
}

/* Paleta de presets de color */
.color-presets-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.1s ease;
}

.color-swatch:hover {
  transform: scale(1.15);
}

.color-swatch.active {
  border-color: var(--fg);
  transform: scale(1.1);
}

/* Swatch "sin relleno": transparente, borde punteado e icono visible en ambos temas */
.color-swatch-none {
  background: transparent !important;
  border: 1.5px dashed var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.color-swatch-none:hover {
  border-color: var(--accent);
}
.color-swatch-none iconify-icon {
  width: 13px;
  height: 13px;
}
.color-swatch-none.active {
  border-color: var(--accent);
  border-style: solid;
}

.color-input-native {
  width: 26px;
  height: 26px;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  background: transparent;
  padding: 0;
}

/* Grupo de grosores */
.stroke-width-group {
  display: flex;
  gap: 4px;
}

.stroke-width-btn {
  flex: 1;
  padding: 6px 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.stroke-width-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background-color: rgba(var(--accent-rgb), 0.15);
}

/* Ayuda cuando no hay selección */
.no-selection-help {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 0.78rem;
}

.shortcuts-table td {
  padding: 5px 0;
  border-bottom: 1px solid rgba(var(--border-rgb), 0.3);
}

.shortcuts-table kbd {
  font-family: var(--font-mono);
  background-color: var(--surface2);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.72rem;
  color: var(--fg);
}

/* ==========================================================================
   7. FOOTER OFICIAL CON LICENCIA EXACTA
   ========================================================================== */

.app-footer {
  height: var(--footer-height);
  background-color: var(--surface);
  border-top: 1px solid rgba(var(--accent-rgb), 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 16px;
  z-index: 50;
  flex-shrink: 0;
}

.app-footer p {
  font-size: 0.76rem;
  color: var(--muted);
  line-height: 1.35;
}

/* ==========================================================================
   8. MODALES Y DIÁLOGOS ACCESIBLES
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(11, 17, 30, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}

[data-theme="light"] .modal-backdrop {
  background-color: rgba(35, 47, 64, 0.55);
}

.modal-dialog {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 680px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-dialog-sm {
  max-width: 440px;
}

.modal-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close-btn {
  padding: 4px;
  color: var(--muted);
  border-radius: var(--radius-sm);
}

.modal-close-btn:hover {
  color: var(--fg);
  background: var(--surface2);
}

.modal-body {
  padding: 18px;
  overflow-y: auto;
  font-size: 0.9rem;
  color: var(--fg);
}

.modal-desc {
  color: var(--muted);
  margin-bottom: 14px;
}

.modal-footer {
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  background-color: var(--bg);
}

/* Cuadrícula de ejemplos */
.examples-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.example-card {
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: border-color 0.15s ease;
}

.example-card:hover {
  border-color: var(--accent);
}

.example-info {
  flex: 1;
}

.example-card-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 4px;
}

.example-card-desc {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.35;
}

.info-desc-text {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--fg);
}

/* ==========================================================================
   9. ELEMENTOS DE IMPRESIÓN (OCULTOS EN PANTALLA)
   ========================================================================== */

.print-student-box {
  display: none;
}

/* ==========================================================================
   10. ESTILOS DE IMPRESIÓN Y PDF (@media print)
   ========================================================================== */

@media print {
  @page {
    size: A4 portrait;
    margin: 8mm 10mm 10mm 10mm;
  }

  /* Forzar tema claro absoluto para la impresión */
  html, body {
    color-scheme: light !important;
    background-color: #ffffff !important;
    color: #1B2636 !important;
    overflow: visible !important;
    height: auto !important;
    width: 100% !important;
    font-size: 12pt !important;
  }

  /* Orden de impresión vertical: cajetín ARRIBA, diagrama en medio, footer al final en flujo */
  body {
    display: flex !important;
    flex-direction: column !important;
  }
  .print-student-box {
    order: 1;
  }
  .editor-workspace {
    order: 2;
  }
  .app-footer {
    order: 3;
  }

  /* Ocultar interfaz no didáctica */
  .app-header,
  .app-toolbar,
  .shapes-sidebar,
  .properties-panel,
  .btn-floating-help,
  .text-editor-overlay,
  .arrow-guide-banner,
  .modal-backdrop,
  .resize-handle,
  .selection-bbox,
  .grid-layer,
  .comment-panel-actions,
  .comment-icon-btn,
  .svg-arrow-hitbox {
    display: none !important;
  }

  .editor-workspace {
    height: auto !important;
    overflow: visible !important;
    background: #ffffff !important;
    /* reserva espacio en la última página para el pie de página fijo */
    padding-bottom: 26mm;
  }

  .canvas-wrapper {
    overflow: visible !important;
    height: auto !important;
    background: #ffffff !important;
  }

  .diagram-canvas {
    width: 100% !important;
    height: 180mm !important;
    background: #ffffff !important;
  }

  /* Mostrar cajetín de alumno formateado */
  .print-student-box {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6mm;
    padding-bottom: 4mm;
    border-bottom: 2px solid #53677D;
  }

  .print-header-brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
  }

  .print-wordmark {
    font-family: 'IBM Plex Mono', monospace !important;
    font-size: 14pt !important;
    font-weight: 700 !important;
    color: #1B2636 !important;
  }

  .print-wordmark b {
    color: #1D7DA6 !important;
  }

  .print-app-title {
    font-family: 'Space Grotesk', sans-serif !important;
    font-size: 13pt !important;
    font-weight: 700 !important;
    color: #1B2636 !important;
  }

  .print-student-table {
    border-collapse: collapse;
    border: 1px solid #53677D;
    font-size: 9.5pt;
  }

  .print-student-table th {
    background-color: #F0EDE3;
    color: #1B2636;
    padding: 4px 8px;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 700;
    border: 1px solid #53677D;
    text-align: right;
  }

  .print-student-table td {
    padding: 4px 10px;
    border: 1px solid #53677D;
    font-family: 'DM Sans', sans-serif;
    min-width: 60px;
    color: #1B2636;
  }

  /* Comentarios: SIEMPRE DESPLEGADOS EN PRINT */
  .comment-chip {
    display: none !important;
  }

  .comment-panel {
    display: flex !important;
    height: auto !important;
    background-color: #FAF8F2 !important;
    border: 1.5px solid #A35E2B !important;
    color: #1B2636 !important;
    box-shadow: none !important;
    page-break-inside: avoid;
  }

  .comment-panel-title {
    color: #A35E2B !important;
  }

  .comment-textarea {
    background-color: #ffffff !important;
    color: #1B2636 !important;
    border: 1px solid #C2CCD4 !important;
    font-size: 9pt !important;
  }

  .comment-lead-line {
    stroke: #A35E2B !important;
    stroke-width: 1.5 !important;
  }

  /* Trazados SVG en papel: cajas sin relleno, bordes y textos con su color elegido */
  .svg-box-shape {
    fill: #ffffff !important;
  }

  .arrow-label-bg {
    fill: #FAF8F2 !important;
    stroke: #53677D !important;
  }

  .arrow-label-text {
    fill: #1B2636 !important;
  }

  /* Footer como PIE DE PÁGINA REAL: fijo al pie del área imprimible, se repite en cada
     página del PDF (position:fixed en print). Fondo blanco sólido para no mostrar el
     contenido que quede detrás. El contenido reserva espacio con padding-bottom. */
  .app-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: #ffffff !important;
    border: none !important;
    border-top: 1px solid #C2CCD4 !important;
    padding: 2mm 10mm 3mm;
    margin: 0;
    z-index: 20;
  }

  .app-footer p {
    font-size: 8pt !important;
    color: #44515E !important;
  }
}

/* ==========================================================================
   11. ADAPTABILIDAD A PANTALLAS PEQUEÑAS (768px)
   ========================================================================== */

@media (max-width: 768px) {
  .app-header {
    height: auto;
    padding: 8px 12px;
    flex-wrap: wrap;
  }

  .header-student-box {
    order: 3;
    width: 100%;
    max-width: none;
  }

  .header-actions {
    margin-left: auto;
  }

  .editor-workspace {
    flex-direction: column;
  }

  .shapes-sidebar {
    width: 100%;
    height: auto;
    max-height: 56px;
    border-right: none;
    border-bottom: 1px solid var(--border);
    flex-direction: row;
  }

  .shapes-sidebar-header {
    display: none;
  }

  .shapes-sidebar-content {
    flex-direction: row;
    overflow-x: auto;
    width: 100%;
    padding: 4px 8px;
    gap: 6px;
    scrollbar-width: none;
  }

  .shapes-sidebar .shape-btn {
    width: auto;
    white-space: nowrap;
    flex-shrink: 0;
    padding: 4px 8px;
  }

  .properties-panel {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 280px;
    transform: translateX(100%);
    transition: transform 0.2s ease;
  }

  .properties-panel.open {
    transform: translateX(0);
  }
}

/* ==========================================================================
   12. ACCESIBILIDAD: PREFERS-REDUCED-MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}