/* ==========================================================================
   Formateador y Validador de HTML - Estilos Canónicos Fijate Tools
   ========================================================================== */

:root {
  --primary-color: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: rgba(2, 132, 199, 0.12);
  --primary-border: rgba(2, 132, 199, 0.35);

  --accent-color: #06b6d4;
  --success-color: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --warning-color: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --error-color: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.12);

  --bg-main: #0b0f17;
  --bg-card: #111827;
  --bg-subtle: #1f2937;
  --bg-editor: #0d131f;
  --bg-gutter: #080d16;

  --border-color: #374151;
  --border-subtle: #252e3d;

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

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

  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --transition-fast: 0.15s ease;
}

[data-theme="light"] {
  --primary-color: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: rgba(2, 132, 199, 0.08);
  --primary-border: rgba(2, 132, 199, 0.25);

  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-editor: #f8fafc;
  --bg-gutter: #edf2f7;

  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --shadow-card: 0 4px 16px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

/* Reset y Contención */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tool-layout {
  max-width: 1360px;
  width: 100%;
  margin: 1rem auto 3rem;
  padding: 0 1rem;
  flex: 1 0 auto;
}

/* Layout con Aside */
.tool-with-sidebar {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  width: 100%;
}

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

/* Tarjeta Principal */
.card-main {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-bottom: 2rem;
}

/* Barra de Herramientas Superior */
.toolbar-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-subtle) 100%);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toolbar-group-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-group-options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 42px;
  padding: 0 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--primary-color);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.35);
}

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

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--primary-light);
  border-color: var(--primary-border);
  color: var(--primary-color);
}

.btn-danger-outline {
  background: transparent;
  color: var(--error-color);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger-outline:hover {
  background: var(--error-bg);
  border-color: var(--error-color);
}

.btn-icon-only {
  width: 42px;
  padding: 0;
}

/* Desplegables y Switches */
.option-select-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.select-control {
  appearance: none;
  -webkit-appearance: none;
  height: 42px;
  padding: 0 2.25rem 0 0.85rem;
  background-color: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  cursor: pointer;
  font-weight: 500;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 16px;
}

.select-control:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 1px;
}

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

.toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  accent-color: var(--primary-color);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* Espacio de Trabajo Principal (2 Columnas) */
.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  min-height: 580px;
  background: var(--bg-card);
}

/* Columna Izquierda: Editor */
.editor-pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-color);
  min-width: 0;
}

.pane-header {
  padding: 0.75rem 1.25rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.pane-title-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-main);
}

.pane-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-pane-action {
  height: 32px;
  padding: 0 0.65rem;
  font-size: 0.775rem;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.btn-pane-action:hover {
  background: var(--bg-card);
  color: var(--primary-color);
  border-color: var(--primary-border);
}

/* Editor con Gutter de Líneas */
.editor-container {
  display: flex;
  position: relative;
  flex: 1 1 0%;
  min-height: 480px;
  background: var(--bg-editor);
  overflow: hidden;
}

.line-numbers-gutter {
  width: 48px;
  padding: 1rem 0.5rem 1rem 0;
  background: var(--bg-gutter);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5rem;
  text-align: right;
  user-select: none;
  border-right: 1px solid var(--border-color);
  overflow: hidden;
  box-sizing: border-box;
}

.code-textarea {
  flex: 1 1 0%;
  width: 0;
  min-width: 0;
  padding: 1rem;
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5rem;
  border: none;
  resize: none;
  outline: none;
  white-space: pre;
  overflow-x: auto;
  overflow-y: scroll;
  tab-size: 2;
  box-sizing: border-box;
}

.code-textarea::placeholder {
  color: var(--text-dim);
}

/* Columna Derecha: Panel de Pestañas (Validación y Preview) */
.output-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-card);
}

.tabs-nav {
  display: flex;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
  background: var(--bg-card);
}

.tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.tab-badge.badge-error {
  background: var(--error-bg);
  color: var(--error-color);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.tab-badge.badge-success {
  background: var(--success-bg);
  color: var(--success-color);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.tab-badge.badge-warning {
  background: var(--warning-bg);
  color: var(--warning-color);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Contenido de Pestañas */
.tab-content {
  display: none;
  flex: 1 1 0%;
  flex-direction: column;
  overflow-y: auto;
  min-height: 480px;
}

.tab-content.active {
  display: flex;
}

/* Resumen y Métricas de Validación */
.validation-summary-card {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
}

.validation-status-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.validation-status-banner.valid {
  background: var(--success-bg);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--success-color);
}

.validation-status-banner.invalid {
  background: var(--error-bg);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error-color);
}

.status-title {
  font-weight: 700;
  font-size: 0.9375rem;
}

.status-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.metric-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  text-align: center;
}

.metric-pill-value {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
}

.metric-pill-label {
  font-size: 0.6875rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Lista de Incidencias */
.issues-list {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  overflow-y: auto;
}

.issue-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: transform var(--transition-fast);
}

.issue-card:hover {
  transform: translateX(2px);
}

.issue-card.error {
  border-left-color: var(--error-color);
}

.issue-card.warning {
  border-left-color: var(--warning-color);
}

.issue-card.info {
  border-left-color: var(--accent-color);
}

.issue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.issue-tag-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
}

.issue-card.error .issue-tag-badge {
  background: var(--error-bg);
  color: var(--error-color);
}

.issue-card.warning .issue-tag-badge {
  background: var(--warning-bg);
  color: var(--warning-color);
}

.issue-card.info .issue-tag-badge {
  background: var(--primary-light);
  color: var(--primary-color);
}

.issue-location {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.issue-message {
  font-size: 0.8125rem;
  color: var(--text-main);
  line-height: 1.4;
}

.btn-goto-line {
  align-self: flex-start;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  background: transparent;
  color: var(--primary-color);
  border: none;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
}

/* Pestaña de Vista Previa */
.preview-toolbar {
  padding: 0.5rem 1rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.preview-resolutions {
  display: flex;
  gap: 0.25rem;
}

.btn-res {
  height: 28px;
  padding: 0 0.5rem;
  font-size: 0.75rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
}

.btn-res.active, .btn-res:hover {
  background: var(--primary-light);
  color: var(--primary-color);
  border-color: var(--primary-border);
}

.preview-frame-wrapper {
  flex: 1 1 0%;
  display: flex;
  justify-content: center;
  align-items: stretch;
  background: #000000;
  overflow: auto;
  padding: 0.75rem;
}

.sandbox-iframe {
  width: 100%;
  height: 100%;
  min-height: 420px;
  border: 1px solid var(--border-color);
  background: #ffffff;
  border-radius: var(--radius-sm);
  transition: width 0.2s ease;
}

.sandbox-iframe.view-tablet {
  max-width: 768px;
}

.sandbox-iframe.view-mobile {
  max-width: 375px;
}

/* Barra de Estado Inferior */
.statusbar {
  padding: 0.65rem 1.5rem;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.statusbar-left, .statusbar-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.stat-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.stat-item strong {
  color: var(--text-main);
  font-family: var(--font-mono);
}

.stat-badge-savings {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  background: var(--success-bg);
  color: var(--success-color);
}

/* Sección Didáctica y SEO */
.tool-info-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 2rem;
  color: var(--text-main);
}

.tool-info-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.tool-info-section h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--primary-color);
}

.tool-info-section p {
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0.5rem 0;
}

.tool-info-section ul {
  color: var(--text-muted);
  padding-left: 1.5rem;
  margin: 0.5rem 0 1rem;
  line-height: 1.6;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.feature-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.feature-box h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-box p {
  font-size: 0.875rem;
  margin: 0;
  color: var(--text-muted);
}

/* Modal Canónico Accesible */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1rem;
}

.modal-backdrop.active {
  display: flex;
}

.modal-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 480px;
  width: 100%;
  overflow: hidden;
  animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.15rem;
  margin: 0;
}

.modal-body {
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.modal-footer {
  padding: 1rem 1.5rem;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Toast Notificación */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary-color);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  animation: toastIn 0.25s ease-out;
  pointer-events: auto;
}

.toast.toast-success {
  border-left-color: var(--success-color);
}

.toast.toast-error {
  border-left-color: var(--error-color);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Adaptabilidad Responsiva para Móvil */
@media (max-width: 960px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .editor-pane {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .editor-container {
    min-height: 380px;
  }

  .toolbar-header {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-group-actions,
  .toolbar-group-options {
    width: 100%;
  }

  .toolbar-group-actions .btn {
    flex: 1 1 calc(50% - 0.5rem);
    width: 100%;
  }

  .option-select-wrapper {
    width: 100%;
  }

  .select-control {
    width: 100%;
  }

  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .toolbar-group-actions .btn {
    flex: 1 1 100%;
  }

  .statusbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .statusbar-left, .statusbar-right {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
}