/**
 * Graficador de Funciones Matemáticas - Fijate Tools • Math Studio
 * Hoja de estilos con soporte para modo oscuro/claro, diseño responsive táctil y glassmorphism.
 */

:root {
  --bg-app: #080c14;
  --bg-card: #0f172a;
  --bg-card-alt: #1e293b;
  --bg-input: #0b1120;
  --border-color: #334155;
  --border-focus: #00e5ff;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-cyan: #00e5ff;
  --accent-orange: #ff8507;
  --accent-green: #10b981;
  --accent-purple: #a855f7;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.15);

  color-scheme: dark;
}

[data-theme="light"] {
  --bg-app: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-alt: #f8fafc;
  --bg-input: #f1f5f9;
  --border-color: #cbd5e1;
  --border-focus: #0284c7;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.12);

  color-scheme: light;
}

/* Reset y base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
}

.font-mono {
  font-family: var(--font-mono);
}

/* Contenedor y Layout */
.tool-layout {
  max-width: 1240px;
  width: 100%;
  margin: 1.25rem auto 3rem;
  padding: 0 1rem;
  flex: 1;
}

.tool-with-sidebar {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.tool-main-content {
  flex: 1 1 0%;
  min-width: 0;
  width: 100%;
}

/* Cabecera de la herramienta */
.tool-header-intro {
  margin-bottom: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.tool-header-intro h2 {
  font-size: 1.5rem;
  margin-bottom: 0.35rem;
  background: linear-gradient(135deg, var(--text-main) 30%, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tool-header-intro p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Pestañas de modo (Nav tabs) */
.mode-tabs-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.25rem;
  scrollbar-width: none;
}
.mode-tabs-container::-webkit-scrollbar {
  display: none;
}

.mode-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  border-radius: 9px 9px 0 0;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-bottom: none;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
  min-height: 40px;
}

.mode-tab-btn:hover {
  background: var(--bg-card);
  color: var(--text-main);
}

.mode-tab-btn.is-active {
  background: var(--bg-card);
  color: var(--accent-cyan);
  border-color: var(--border-color);
  border-bottom: 2px solid var(--bg-card) !important;
  margin-bottom: -2px;
  z-index: 4;
  box-shadow: 0 -3px 0 var(--accent-cyan);
}

/* Contenedor de Trabajo (Lienzo + Panel lateral) */
.math-workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

/* Tarjeta del Visor Gráfico */
.graph-viewport-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  position: relative;
}

.viewport-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: var(--bg-card-alt);
  border-bottom: 1px solid var(--border-color);
  gap: 0.5rem;
}

.viewport-toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-canvas-control {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.65rem;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 36px;
  transition: all 0.15s ease;
}

.btn-canvas-control:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Canvas y Contenedor 3D */
.canvas-wrapper {
  position: relative;
  width: 100%;
  height: clamp(380px, 55vh, 620px);
  background: #080c14;
  overflow: hidden;
}

#canvas-2d {
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

#container-3d {
  width: 100%;
  height: 100%;
  display: none;
  cursor: grab;
}
#container-3d:active {
  cursor: grabbing;
}

/* Panel Lateral de Controles */
.sidebar-controls-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--shadow-md);
}

/* Lista de Funciones 2D */
.functions-list-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.function-item-card {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  transition: border-color 0.15s ease;
}

.function-item-card.is-muted {
  opacity: 0.55;
}

.function-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.function-color-badge {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px currentColor;
}

.function-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
}

.function-header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-toggle-deriv {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-toggle-deriv.is-active {
  background: var(--accent-cyan);
  color: #000000;
  border-color: var(--accent-cyan);
  font-weight: 700;
}

.btn-toggle-visibility, .btn-delete-fn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
}

.btn-toggle-visibility:hover, .btn-delete-fn:hover {
  color: var(--text-main);
  background: var(--bg-card);
}

.function-input-wrapper {
  display: flex;
  width: 100%;
}

.form-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  outline: none;
  min-height: 40px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(0, 229, 255, 0.2);
}

.form-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.9rem;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  outline: none;
  min-height: 40px;
  cursor: pointer;
}

.form-select option {
  background-color: var(--bg-card);
  color: var(--text-main);
}

.function-error-msg {
  color: var(--accent-red);
  font-size: 0.78rem;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
}

/* Botones Principales */
.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, #00e5ff 0%, #00b4d8 100%);
  color: #000000;
  border: none;
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 40px;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  width: 100%;
  background: var(--bg-card-alt);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 40px;
  transition: all 0.15s ease;
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--accent-cyan);
}

/* Parámetros Dinámicos (Sliders) */
.parameters-box {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.parameters-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.65rem;
}

.parameters-header h4 {
  font-size: 0.9rem;
}

.btn-anim-param {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-anim-param.is-playing {
  background: var(--accent-orange);
  color: #ffffff;
  border-color: var(--accent-orange);
}

.param-slider-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.45rem;
}

.param-slider-row:last-child {
  margin-bottom: 0;
}

.param-label {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.88rem;
  width: 20px;
}

.param-range-input {
  flex: 1 1 0%;
  width: 0;
  min-width: 0;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.param-val-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  min-width: 36px;
  text-align: right;
  color: var(--accent-cyan);
}

/* Teclado Matemático Virtual */
.virtual-keyboard-card {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.virtual-keyboard-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.virtual-keys-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.35rem;
}

.vkey {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.45rem 0.2rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  transition: all 0.12s ease;
}

.vkey:hover {
  background: var(--bg-input);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.vkey-fn {
  color: var(--accent-cyan);
}

.vkey-var {
  color: var(--accent-orange);
}

/* Paneles Específicos (Cálculo, Tabla, Polar, 3D) */
.section-panel-box {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
}

.section-panel-box h4 {
  font-size: 0.95rem;
  margin-bottom: 0.65rem;
}

.calc-results-box {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-size: 0.88rem;
  margin-top: 0.5rem;
}

.badges-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.35rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-root {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid var(--accent-green);
}

.badge-max {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  border: 1px solid var(--accent-red);
}

.badge-min {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
  border: 1px solid #3b82f6;
}

/* Tabla de valores */
.table-responsive-wrapper {
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
}

.math-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.math-data-table th, .math-data-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.math-data-table th {
  background: var(--bg-card-alt);
  position: sticky;
  top: 0;
  font-family: var(--font-heading);
}

.math-data-table tr:hover {
  background: var(--bg-input);
}

/* Guía Educativa y FAQ */
.educational-guide-section {
  margin-top: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.guide-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}

.guide-card {
  background: var(--bg-card-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem;
}

.guide-card h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--accent-cyan);
}

.guide-card p, .guide-card li {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.guide-card ul {
  padding-left: 1.2rem;
  margin-top: 0.4rem;
}

/* Modal Genérico Accesible */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-dialog-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 460px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.modal-header {
  margin-bottom: 0.85rem;
}

.modal-title {
  font-size: 1.25rem;
  color: var(--accent-cyan);
}

.modal-body {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  white-space: pre-line;
}

/* Responsive móvil */
@media (max-width: 900px) {
  .math-workspace-grid {
    grid-template-columns: 1fr;
  }

  .virtual-keys-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .canvas-wrapper {
    height: 380px;
  }
}

@media (max-width: 480px) {
  .tool-layout {
    padding: 0 0.5rem;
  }

  .virtual-keys-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}