/* =========================================================================
   SIMULADOR DE CUBO DE RUBIK Y GRAFO DE ÓRBITAS - ESTILOS CSS PURO
   Akutangulo | 100% Nativo, Sin Frameworks Externos, Totalmente Responsive
   ========================================================================= */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Paleta Oficial Akutangulo */
  --aku-morado: #9300d3;
  --aku-morado-hover: #a814e8;
  --aku-morado-light: #f3e8ff;
  --aku-cian: #00c2ff;
  --aku-azul: #3d53cc;
  --aku-amarillo: #facc15;
  --aku-rojo: #e11d48;
  --aku-verde: #10b981;

  /* Tema Claro */
  --bg-app: #ffffff;
  --bg-panel: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --btn-bg: #f1f5f9;
  --btn-hover: #e2e8f0;
  --btn-text: #334155;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
}

body.dark {
  --bg-app: #0b0f19;
  --bg-panel: #111827;
  --bg-card: #111827;
  --border-color: #1f2937;
  --border-subtle: #374151;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --btn-bg: #1f2937;
  --btn-hover: #374151;
  --btn-text: #e2e8f0;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: fixed;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  user-select: none;
  -webkit-user-select: none;
  transition: background-color 0.2s ease, color 0.2s ease;
  display: flex;
  flex-direction: column;
}

/* Enlace Accesible Skip Link (WCAG 2.4.1) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 100;
  background: var(--aku-morado);
  color: #ffffff;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 0.75rem;
  outline: 3px solid #ffffff;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus Visible Accesible (WCAG 2.4.7) */
button:focus-visible, input:focus-visible, a:focus-visible {
  outline: 3px solid var(--aku-morado) !important;
  outline-offset: 2px !important;
}

/* Prevención de scroll accidental al interactuar en móviles */
canvas, #canvas3d-container, #canvas2d-wrapper {
  touch-action: none;
  -webkit-touch-callout: none;
}

/* =========================================================================
   1. CABECERA SUPERIOR RESPONSIVA
   ========================================================================= */
.app-header {
  height: 3.25rem;
  border-bottom: 1px solid var(--border-color);
  padding: 0 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  z-index: 30;
  flex-shrink: 0;
  gap: 0.5rem;
}
@media (min-width: 640px) {
  .app-header { padding: 0 1rem; }
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.brand-icon {
  width: 1.875rem;
  height: 1.875rem;
  border-radius: 0.375rem;
  background: linear-gradient(135deg, var(--aku-morado), var(--aku-cian), var(--aku-amarillo));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(147, 0, 211, 0.25);
  flex-shrink: 0;
}

.brand-title {
  font-size: 0.8125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--text-main);
  white-space: nowrap;
}
@media (min-width: 640px) {
  .brand-title { font-size: 0.875rem; }
}

.brand-badge {
  display: none;
  font-size: 0.625rem;
  padding: 0.1rem 0.4rem;
  border-radius: 9999px;
  background: var(--aku-morado-light);
  color: var(--aku-morado);
  font-family: var(--font-mono);
  font-weight: 600;
  border: 1px solid rgba(147, 0, 211, 0.2);
}
@media (min-width: 768px) {
  .brand-badge { display: inline-block; }
}
body.dark .brand-badge {
  background: rgba(147, 0, 211, 0.2);
  color: #d8b4fe;
}

/* Selector de Vistas Móviles */
.view-tabs {
  display: flex;
  align-items: center;
  background: var(--btn-bg);
  padding: 2px;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}
@media (min-width: 768px) {
  .view-tabs { display: none; }
}

.tab-btn {
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 0.375rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: all 0.15s ease;
}
.tab-btn[aria-selected="true"] {
  background: var(--bg-app);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

/* Acciones en Cabecera */
.header-actions-desktop {
  display: none;
  align-items: center;
  gap: 0.375rem;
}
@media (min-width: 768px) {
  .header-actions-desktop { display: flex; }
}

.header-actions-mobile {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
@media (min-width: 768px) {
  .header-actions-mobile { display: none; }
}

/* Menú Desplegable Móvil (Drawer de Cabecera) */
.mobile-nav-menu {
  position: absolute;
  top: 3.25rem;
  right: 0.5rem;
  z-index: 45;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-xl);
  padding: 0.5rem;
  width: 15rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: all 0.2s ease;
}
.mobile-nav-menu.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.menu-item-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 0.375rem;
  border: none;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  transition: background 0.12s ease;
}
.menu-item-btn:hover {
  background: var(--btn-bg);
}

/* =========================================================================
   2. BOTONES GENERALES
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.375rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 0.375rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--btn-bg);
  color: var(--btn-text);
  border-color: var(--border-color);
  white-space: nowrap;
}
.btn:hover {
  background: var(--btn-hover);
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0) scale(0.96);
}

.btn-icon-only {
  padding: 0.375rem;
  width: 2rem;
  height: 2rem;
}

.btn-primary {
  background: var(--aku-morado);
  color: #ffffff;
  border-color: var(--aku-morado);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--aku-morado-hover);
}

.btn-success {
  background: var(--aku-verde);
  color: #ffffff;
  border-color: var(--aku-verde);
  box-shadow: var(--shadow-sm);
}
.btn-success:hover {
  background: #059669;
}

.divider-v {
  width: 1px;
  height: 1rem;
  background: var(--border-color);
  margin: 0 0.25rem;
}

/* =========================================================================
   3. ÁREA PRINCIPAL DE PANELES (2D & 3D) - ENCUADRE ÓPTIMO
   ========================================================================= */
.main-viewport {
  flex: 1;
  min-height: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.viewport-panel {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

/* En escritorio (>= 768px): Ambos paneles 50% / 50% lado a lado */
@media (min-width: 768px) {
  .main-viewport {
    flex-direction: row;
  }
  .main-viewport .viewport-panel {
    display: flex !important;
    width: 50% !important;
    height: 100% !important;
  }
}

/* En móviles (< 768px): Controlado por data-view al 100% de alto */
@media (max-width: 767px) {
  .main-viewport[data-view="cube"] #grafo-panel { display: none !important; }
  .main-viewport[data-view="cube"] #cubo-panel { display: flex !important; width: 100% !important; height: 100% !important; }

  .main-viewport[data-view="graph"] #cubo-panel { display: none !important; }
  .main-viewport[data-view="graph"] #grafo-panel { display: flex !important; width: 100% !important; height: 100% !important; }
}

#grafo-panel {
  border-right: 1px solid var(--border-color);
  background: var(--bg-app);
}

#cubo-panel {
  background: var(--bg-panel);
}

.canvas-wrapper {
  flex: 1;
  width: 100%;
  height: 100%;
  position: relative;
  outline: none;
  cursor: grab;
  min-height: 0;
}
.canvas-wrapper:active {
  cursor: grabbing;
}
.canvas-wrapper canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.panel-header-badge {
  position: absolute;
  top: 0.625rem;
  left: 0.625rem;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  pointer-events: none;
}

.badge-tag {
  pointer-events: auto;
  padding: 0.2rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 0.375rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.status-indicator {
  padding: 0.125rem 0.4rem;
  font-size: 0.625rem;
  font-family: var(--font-mono);
  font-weight: 700;
  border-radius: 0.25rem;
  border: 1px solid;
}
.status-resolved {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
  border-color: rgba(16, 185, 129, 0.3);
}
body.dark .status-resolved {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}
.status-scrambled {
  background: rgba(147, 0, 211, 0.1);
  color: var(--aku-morado);
  border-color: rgba(147, 0, 211, 0.3);
}
body.dark .status-scrambled {
  background: rgba(147, 0, 211, 0.2);
  color: #d8b4fe;
}

.panel-tools {
  position: absolute;
  top: 0.625rem;
  right: 0.625rem;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-card);
  padding: 0.2rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.move-floating-indicator {
  position: absolute;
  bottom: 2rem;
  right: 1.25rem;
  z-index: 10;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 900;
  color: rgba(147, 0, 211, 0.75);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}

/* =========================================================================
   4. CONTROL DECK INFERIOR (COMPACTO Y SIEMPRE ACCESIBLE SIN TAPAR)
   ========================================================================= */
.control-footer {
  width: 100%;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  z-index: 20;
  flex-shrink: 0;
  padding: 0.375rem 0.5rem;
  box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.04);
}
@media (min-width: 640px) {
  .control-footer {
    padding: 0.5rem 1rem 0.625rem 1rem;
  }
}

.control-container {
  max-width: 76rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.375rem;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  overflow-x: auto;
  max-width: 100%;
}
@media (min-width: 640px) {
  .control-group { gap: 0.375rem; }
}

.group-label {
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.125rem;
  flex-shrink: 0;
}
@media (min-width: 640px) {
  .group-label { font-size: 0.6875rem; }
}

/* Botones de Giros de Caras */
.move-btn-pair {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex-shrink: 0;
}

.btn-move {
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 0.2rem 0.45rem;
  font-size: 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.12s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 1.625rem;
  min-width: 1.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
@media (min-width: 640px) {
  .btn-move {
    padding: 0.25rem 0.5rem;
    min-height: 1.75rem;
    min-width: 2.125rem;
  }
}
.btn-move:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
  box-shadow: var(--shadow-sm);
}
.btn-move:active {
  transform: translateY(0) scale(0.95);
}

.btn-move-prime {
  min-height: 1rem;
  font-size: 0.625rem;
  padding: 0.025rem 0.35rem;
}

/* Colores de caras */
.btn-face-u { background: var(--aku-amarillo); color: #0f172a; border-color: #eab308; }
.btn-face-u-prime { background: #fef9c3; color: #713f12; border-color: #fde047; }
body.dark .btn-face-u-prime { background: #422006; color: #fef08a; border-color: #713f12; }

.btn-face-d { background: var(--aku-rojo); color: #ffffff; border-color: #be123c; }
.btn-face-d-prime { background: #ffe4e6; color: #881337; border-color: #fecdd3; }
body.dark .btn-face-d-prime { background: #4c0519; color: #fecdd3; border-color: #881337; }

.btn-face-f { background: var(--aku-morado); color: #ffffff; border-color: #7e22ce; }
.btn-face-f-prime { background: #f3e8ff; color: #581c87; border-color: #e9d5ff; }
body.dark .btn-face-f-prime { background: #3b0764; color: #e9d5ff; border-color: #581c87; }

.btn-face-b { background: var(--aku-azul); color: #ffffff; border-color: #1e3a8a; }
.btn-face-b-prime { background: #dbeafe; color: #1e3a8a; border-color: #bfdbfe; }
body.dark .btn-face-b-prime { background: #172554; color: #bfdbfe; border-color: #1e3a8a; }

.btn-face-r { background: var(--aku-cian); color: #0f172a; border-color: #06b6d4; }
.btn-face-r-prime { background: #cffafe; color: #164e63; border-color: #a5f3fc; }
body.dark .btn-face-r-prime { background: #083344; color: #a5f3fc; border-color: #164e63; }

.btn-face-l { background: var(--aku-verde); color: #ffffff; border-color: #047857; }
.btn-face-l-prime { background: #d1fae5; color: #064e3b; border-color: #a7f3d0; }
body.dark .btn-face-l-prime { background: #022c22; color: #a7f3d0; border-color: #064e3b; }

.btn-slice { background: #334155; color: #ffffff; border-color: #1e293b; }
.btn-slice-prime { background: var(--btn-bg); color: var(--text-main); border-color: var(--border-color); }

/* Regulador de velocidad */
.speed-control {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.speed-slider {
  width: 4.5rem;
  height: 0.375rem;
  accent-color: var(--aku-morado);
  border-radius: 0.5rem;
  background: var(--border-color);
  cursor: pointer;
}
@media (min-width: 640px) {
  .speed-slider { width: 5.5rem; }
}
.speed-value {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  width: 2.5rem;
  text-align: right;
}

/* Fila de algoritmos y patrones (Plegable en móvil si se desea) */
.alg-row {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border-color);
}
@media (max-width: 767px) {
  .alg-row.hidden-mobile { display: none; }
}
@media (min-width: 640px) {
  .alg-row { flex-direction: row; align-items: center; }
}

.alg-input-box {
  position: relative;
  flex: 1;
  width: 100%;
}
.alg-input {
  width: 100%;
  padding: 0.3rem 4.5rem 0.3rem 1.875rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border-color);
  background: var(--bg-app);
  color: var(--text-main);
  outline: none;
}
.alg-input:focus {
  border-color: var(--aku-morado);
  box-shadow: 0 0 0 2px rgba(147, 0, 211, 0.2);
}
.alg-icon {
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  pointer-events: none;
  display: flex;
  align-items: center;
}
.alg-btn-run {
  position: absolute;
  right: 0.25rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.2rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 700;
  border-radius: 0.25rem;
  background: var(--aku-morado);
  color: #ffffff;
  border: none;
  cursor: pointer;
}
.alg-btn-run:hover {
  background: var(--aku-morado-hover);
}

.patterns-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  overflow-x: auto;
  font-size: 0.6875rem;
  white-space: nowrap;
}

/* =========================================================================
   5. FILA DE RUTA DE RESOLUCIÓN
   ========================================================================= */
.solution-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.375rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border-color);
}

.solution-info {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  overflow: hidden;
  flex: 1;
}

.solution-counter {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

.solution-chips {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  overflow-x: auto;
  padding: 2px 0;
  max-width: 100%;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  -webkit-overflow-scrolling: touch;
}

.chip-move {
  padding: 0.1rem 0.35rem;
  border-radius: 0.25rem;
  background: var(--btn-bg);
  color: var(--text-main);
  font-weight: 600;
  flex-shrink: 0;
}
.chip-next {
  background: var(--aku-morado);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 0 0 2px rgba(147, 0, 211, 0.3);
}

.solution-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

/* =========================================================================
   6. MODAL DE INFORMACIÓN Y GUÍA
   ========================================================================= */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  width: 100%;
  max-width: 42rem;
  max-height: 88vh;
  overflow-y: auto;
  padding: 1.25rem;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform 0.2s ease;
}
@media (min-width: 640px) {
  .modal-card { padding: 1.5rem; }
}
.modal-backdrop.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.625rem;
  margin-bottom: 0.875rem;
}

.modal-title {
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
}
@media (min-width: 640px) {
  .modal-title { font-size: 1.125rem; }
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.guide-box {
  padding: 0.875rem;
  border-radius: 0.75rem;
  background: var(--aku-morado-light);
  border: 1px solid rgba(147, 0, 211, 0.2);
}
body.dark .guide-box {
  background: rgba(147, 0, 211, 0.12);
  border-color: rgba(147, 0, 211, 0.3);
}

.guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
@media (min-width: 640px) {
  .guide-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.guide-card {
  padding: 0.625rem;
  border-radius: 0.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
}

.color-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  list-style: none;
}
@media (min-width: 640px) {
  .color-list { grid-template-columns: repeat(3, 1fr); }
}

.color-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.color-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 9999px;
  flex-shrink: 0;
}