:root {
  /* Paleta de Colores en Modo Oscuro */
  --color-bg: #0d1117;
  --color-bg-subtle: #161b22;
  --color-card: #1c2128;
  --color-card-border: #30363d;
  --color-card-hover: #22272e;
  
  --color-text-main: #f0f6fc;
  --color-text-muted: #8b949e;
  --color-text-secondary: #c9d1d9;

  /* Color de Acento Solicitado */
  --color-accent: #ff9ac5;
  --color-accent-hover: #ffb5d5;
  --color-accent-active: #f383b2;
  --color-accent-dim: rgba(255, 154, 197, 0.12);
  --color-accent-border: rgba(255, 154, 197, 0.35);
  --color-accent-glow: rgba(255, 154, 197, 0.25);
  --color-accent-text-contrast: #180912;

  /* Estados y Alertas */
  --color-success: #3fb950;
  --color-success-bg: rgba(63, 185, 80, 0.15);
  --color-info: #58a6ff;
  --color-info-bg: rgba(88, 166, 255, 0.12);

  /* Medidas y Espaciados Reutilizables */
  --measure-container-max: 820px;
  --measure-radius-sm: 8px;
  --measure-radius-md: 14px;
  --measure-radius-lg: 20px;
  --measure-radius-full: 9999px;

  --measure-space-xs: 0.375rem;
  --measure-space-sm: 0.75rem;
  --measure-space-md: 1.25rem;
  --measure-space-lg: 1.75rem;
  --measure-space-xl: 2.5rem;

  --measure-input-height: 48px;
  --measure-btn-height: 46px;

  /* Tipografía */
  --font-family-base: "Open Sans", sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-accent: 0 4px 20px var(--color-accent-glow);
  --transition-fast: 0.2s ease;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-family-base);
  line-height: 1.6;
  min-height: 100vh;
  padding: var(--measure-space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

/* Contenedor Principal Fluido (Sin Media Queries) */
.app-container {
  width: 100%;
  max-width: var(--measure-container-max);
  display: flex;
  flex-direction: column;
  gap: var(--measure-space-lg);
  margin: 0 auto;
}

/* Encabezado */
.header {
  text-align: center;
  padding: var(--measure-space-lg) var(--measure-space-sm) var(--measure-space-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--measure-space-xs);
}

.header-badge {
  background-color: var(--color-accent-dim);
  color: var(--color-accent);
  border: 1px solid var(--color-accent-border);
  padding: var(--measure-space-xs) var(--measure-space-sm);
  border-radius: var(--measure-radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.header-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

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

.header-subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  max-width: 540px;
}

/* Tarjetas Genéricas */
.card {
  background-color: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-md);
  padding: var(--measure-space-md);
  box-shadow: var(--shadow-card);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: var(--measure-space-sm);
  display: flex;
  align-items: center;
  gap: var(--measure-space-xs);
}

.card-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: -0.25rem;
  margin-bottom: var(--measure-space-md);
}

/* Zona de Carga de Archivos (Drag and Drop) */
.dropzone {
  border: 2px dashed var(--color-card-border);
  border-radius: var(--measure-radius-md);
  padding: var(--measure-space-xl) var(--measure-space-md);
  text-align: center;
  background-color: var(--color-bg-subtle);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--measure-space-sm);
  position: relative;
  overflow: hidden;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-dim);
  transform: translateY(-2px);
}

.dropzone-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background-color: var(--color-card);
  border: 1px solid var(--color-card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  box-shadow: var(--shadow-card);
}

.dropzone-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.dropzone-subtext {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.file-input-hidden {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Info del Archivo Cargado */
.loaded-file-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--measure-space-sm);
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--measure-radius-sm);
  padding: var(--measure-space-sm) var(--measure-space-md);
  margin-top: var(--measure-space-sm);
}

.file-meta {
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.file-icon {
  color: var(--color-accent);
  flex-shrink: 0;
}

.file-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-main);
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.file-status-sub {
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
  margin-top: 0.15rem;
}

.file-badge-ready {
  font-size: 0.75rem;
  color: var(--color-accent);
  background-color: var(--color-accent-dim);
  border: 1px solid var(--color-accent-border);
  padding: 0.1rem 0.5rem;
  border-radius: var(--measure-radius-full);
  font-weight: 600;
}

.file-remove-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--measure-space-xs);
  border-radius: var(--measure-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
}

.file-remove-btn:hover {
  color: var(--color-accent);
}

/* Configuración de Tarifas */
.rates-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--measure-space-sm);
  margin-bottom: var(--measure-space-sm);
}

.presets-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--measure-space-xs);
}

.preset-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-right: 0.25rem;
}

.preset-btn {
  background-color: var(--color-bg-subtle);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-full);
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-accent-dim);
}

.preset-btn.active {
  background-color: var(--color-accent);
  color: var(--color-accent-text-contrast);
  border-color: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow);
}

/* Grid de Inputs de Tarifas (Auto-fit para móvil sin media queries) */
.rates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: var(--measure-space-md);
  margin-top: var(--measure-space-sm);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--measure-space-xs);
}

.input-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  display: flex;
  justify-content: space-between;
}

.input-label-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: normal;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix {
  position: absolute;
  left: var(--measure-space-sm);
  color: var(--color-text-muted);
  font-weight: 700;
  font-family: var(--font-family-mono);
  pointer-events: none;
}

.input-control {
  width: 100%;
  height: var(--measure-input-height);
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-sm);
  padding: 0 var(--measure-space-sm) 0 1.75rem;
  color: var(--color-text-main);
  font-family: var(--font-family-mono);
  font-size: 1rem;
  font-weight: 600;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.info-banner {
  background-color: var(--color-bg-subtle);
  border-left: 3px solid var(--color-accent);
  padding: var(--measure-space-sm) var(--measure-space-md);
  border-radius: 0 var(--measure-radius-sm) var(--measure-radius-sm) 0;
  font-size: 0.825rem;
  color: var(--color-text-muted);
  margin-top: var(--measure-space-md);
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
}

/* Botones de Acción */
.actions-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--measure-space-sm);
}

.calc-btn-wrapper {
  margin-top: var(--measure-space-md);
  display: flex;
  justify-content: center;
  width: 100%;
}

.btn-primary {
  min-height: var(--measure-btn-height);
  padding: 0.85rem 1.5rem;
  background-color: var(--color-accent);
  color: var(--color-accent-text-contrast);
  border: none;
  border-radius: var(--measure-radius-sm);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--measure-space-sm);
  box-shadow: var(--shadow-accent);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-sizing: border-box;
}

.btn-calc {
  width: 100%;
  max-width: fit-content;
  font-size: 1.05rem;
}

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

.btn-primary:active {
  background-color: var(--color-accent-active);
  transform: translateY(0);
}

.btn-secondary {
  flex: 1 1 160px;
  min-height: var(--measure-btn-height);
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--measure-space-xs);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Tarjeta Principal de Resultados */
.results-card {
  border-color: var(--color-accent-border);
  background: linear-gradient(180deg, rgba(255, 154, 197, 0.05) 0%, var(--color-card) 100%);
  position: relative;
  overflow: hidden;
}

.results-hero {
  text-align: center;
  padding: var(--measure-space-md) var(--measure-space-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--measure-space-xs);
}

.results-label {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--color-accent);
}

.results-price {
  font-size: 3.2rem;
  font-weight: 900;
  font-family: var(--font-family-mono);
  color: var(--color-text-main);
  line-height: 1.1;
  text-shadow: 0 0 20px var(--color-accent-glow);
}

.results-currency {
  font-size: 1.3rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-left: 0.2rem;
}

.results-rate-applied {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* Estadísticas de Resultados (Grid Fluido sin Media Queries) */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--measure-space-sm);
  margin-top: var(--measure-space-md);
}

.stat-box {
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-sm);
  padding: var(--measure-space-sm) var(--measure-space-md);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.stat-box-label {
  font-size: 0.775rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 600;
}

.stat-box-val {
  font-size: 1.4rem;
  font-weight: 700;
  font-family: var(--font-family-mono);
  color: var(--color-text-main);
}

.stat-box-sub {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Desglose Detallado por Capítulos / Archivos */
.breakdown-details {
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-md);
  background-color: var(--color-card);
  overflow: hidden;
}

.breakdown-summary {
  padding: var(--measure-space-md);
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  background-color: var(--color-bg-subtle);
  transition: background-color var(--transition-fast);
}

.breakdown-summary::-webkit-details-marker {
  display: none;
}

.breakdown-summary:hover {
  background-color: var(--color-card-hover);
}

.summary-title-group {
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
}

.summary-indicator {
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

details[open] .summary-indicator {
  transform: rotate(90deg);
}

.breakdown-content {
  padding: var(--measure-space-md);
  display: flex;
  flex-direction: column;
  gap: var(--measure-space-sm);
}

.breakdown-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--measure-space-xs);
  padding-bottom: var(--measure-space-xs);
  border-bottom: 1px solid var(--color-card-border);
}

.breakdown-actions-text {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.breakdown-btn-group {
  display: flex;
  gap: var(--measure-space-xs);
}

.btn-xs {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--measure-radius-sm);
  padding: 0.25rem 0.6rem;
  font-size: 0.775rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-xs:hover {
  background-color: var(--color-accent-dim);
}

.file-list {
  max-height: 380px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding-right: 0.25rem;
}

/* Barra de scroll estilizada */
.file-list::-webkit-scrollbar {
  width: 6px;
}
.file-list::-webkit-scrollbar-thumb {
  background-color: var(--color-card-border);
  border-radius: 4px;
}

.file-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--measure-space-sm);
  padding: 0.5rem 0.75rem;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-card-border);
  border-radius: var(--measure-radius-sm);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast);
}

.file-row:hover {
  border-color: var(--color-border-hover);
}

.file-row-left {
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-row-name {
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--font-family-mono);
  font-size: 0.825rem;
  color: var(--color-text-secondary);
}

.file-row-right {
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
  flex-shrink: 0;
}

.file-badge-words {
  font-family: var(--font-family-mono);
  font-weight: 700;
  color: var(--color-text-main);
  background-color: var(--color-card);
  border: 1px solid var(--color-card-border);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.file-badge-pages {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Notificación Toast */
.toast {
  position: fixed;
  bottom: var(--measure-space-md);
  background-color: var(--color-card);
  color: var(--color-text-main);
  border: 1px solid var(--color-accent-border);
  box-shadow: var(--shadow-card), var(--shadow-accent);
  padding: var(--measure-space-sm) var(--measure-space-md);
  border-radius: var(--measure-radius-full);
  display: flex;
  align-items: center;
  gap: var(--measure-space-sm);
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 999;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-icon {
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* Spinner de carga */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--color-accent-text-contrast);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Checkbox personalizado */
.custom-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-card-border);
  border-radius: 4px;
  background-color: var(--color-bg);
  cursor: pointer;
  display: inline-grid;
  place-content: center;
  transition: all var(--transition-fast);
}

.custom-checkbox:hover {
  border-color: var(--color-accent);
}

.custom-checkbox:checked {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.custom-checkbox:checked::before {
  content: "";
  width: 10px;
  height: 6px;
  border-left: 2px solid var(--color-accent-text-contrast);
  border-bottom: 2px solid var(--color-accent-text-contrast);
  transform: rotate(-45deg) translate(1px, -1px);
}

/* Pie de página */
.footer {
  text-align: center;
  padding: var(--measure-space-lg) var(--measure-space-sm);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer strong {
  color: var(--color-accent);
}