/* =========================================================================
   main.css — Sistema de diseño compartido
   Inspirado en Apple Human Interface Guidelines (materiales, tipografía SF,
   colores de sistema, radios y elevaciones consistentes).
   Todas las páginas (index, carga, obtener_costo) consumen este archivo.
   ========================================================================= */

/* ---- 1. Tokens ---------------------------------------------------------- */
:root {
  /* Colores de sistema (light) */
  --color-blue: #007AFF;
  --color-blue-pressed: #0062CC;
  --color-green: #34C759;
  --color-green-pressed: #29A147;
  --color-red: #FF3B30;
  --color-orange: #FF9500;
  --color-indigo: #5856D6;

  /* Tintas suaves para banners / estados (equivalentes a los "materiales" de iOS) */
  --tint-blue: rgba(0, 122, 255, 0.10);
  --tint-green: rgba(52, 199, 89, 0.12);
  --tint-red: rgba(255, 59, 48, 0.10);
  --tint-orange: rgba(255, 149, 0, 0.12);

  /* Fondo y superficies */
  --color-bg: #F2F2F7;
  --color-surface: #FFFFFF;
  --color-surface-secondary: #F7F7F9;

  /* Texto */
  --color-label: #1D1D1F;
  --color-label-secondary: #6E6E73;
  --color-label-tertiary: #AEAEB2;
  --color-separator: rgba(60, 60, 67, 0.16);

  /* Tipografía */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Radios */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 999px;

  /* Elevación */
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 10px 30px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 1px 2px rgba(0, 0, 0, 0.05), 0 14px 36px rgba(0, 0, 0, 0.09);

  /* Espaciado */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;

  /* Movimiento */
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #000000;
    --color-surface: #1C1C1E;
    --color-surface-secondary: #2C2C2E;
    --color-label: #F5F5F7;
    --color-label-secondary: #98989D;
    --color-label-tertiary: #636366;
    --color-separator: rgba(84, 84, 88, 0.55);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.5), 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-card-hover: 0 1px 2px rgba(0, 0, 0, 0.55), 0 14px 36px rgba(0, 0, 0, 0.55);
  }
}

/* ---- 2. Reset mínimo ----------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-system);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-label);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; }

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

a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

/* ---- 3. Layout shell ------------------------------------------------------ */
.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-6) var(--space-4);
}

.app-shell--centered {
  justify-content: center;
}

.app-shell__inner {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.app-shell__inner--wide {
  max-width: 640px;
}

.app-header {
  text-align: center;
}

.app-header__eyebrow {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-label-secondary);
  margin-bottom: var(--space-1);
}

.app-header__title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--color-label);
}

.app-header__subtitle {
  margin: var(--space-2) 0 0;
  font-size: 15px;
  color: var(--color-label-secondary);
}

/* ---- 4. Card (material principal) ---------------------------------------- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-6);
  transition: box-shadow var(--duration-base) var(--ease-standard);
}

.card__title {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 var(--space-1);
  color: var(--color-label);
}

.card__subtitle {
  margin: 0 0 var(--space-5);
  font-size: 14px;
  color: var(--color-label-secondary);
}

.card + .card { margin-top: var(--space-4); }

.section-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-label-secondary);
  margin: 0 0 var(--space-3);
}

/* ---- 5. Formularios -------------------------------------------------------- */
.form { display: flex; flex-direction: column; gap: var(--space-4); }

.form__group { display: flex; flex-direction: column; gap: var(--space-2); }

.form__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-label-secondary);
}

.form__input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  background: var(--color-surface-secondary);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--ease-standard),
              background var(--duration-fast) var(--ease-standard);
}

.form__input::placeholder { color: var(--color-label-tertiary); }

.form__input:focus {
  outline: none;
  border-color: var(--color-blue);
  background: var(--color-surface);
  box-shadow: 0 0 0 4px var(--tint-blue);
}

/* ---- 6. Botones ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: 13px 20px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-standard);
}

.btn:active { transform: scale(0.98); }

.btn--auto { width: auto; }

.btn--primary { background: var(--color-blue); color: #fff; }
.btn--primary:hover { background: var(--color-blue-pressed); }

.btn--success { background: var(--color-green); color: #fff; }
.btn--success:hover { background: var(--color-green-pressed); }

.btn--secondary {
  background: var(--color-surface-secondary);
  color: var(--color-blue);
}
.btn--secondary:hover { background: var(--color-separator); }

.btn--link {
  background: transparent;
  color: var(--color-blue);
  padding: var(--space-2) 0;
  width: auto;
  font-weight: 600;
}
.btn--link:hover { text-decoration: underline; }

.btn:disabled {
  background: var(--color-surface-secondary);
  color: var(--color-label-tertiary);
  cursor: not-allowed;
  transform: none;
}

/* ---- 7. Selector de archivos (reemplaza el <input type=file> nativo) ------ */
.file-picker {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border: 1.5px dashed var(--color-separator);
  border-radius: var(--radius-lg);
  background: var(--color-surface-secondary);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-standard),
              background var(--duration-fast) var(--ease-standard);
}

.file-picker:hover,
.file-picker--dragover {
  border-color: var(--color-blue);
  background: var(--tint-blue);
}

.file-picker__icon { color: var(--color-blue); }

.file-picker__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-label);
}

.file-picker__hint {
  font-size: 13px;
  color: var(--color-label-secondary);
}

.file-picker__input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.file-picker__filenames {
  margin-top: var(--space-2);
  font-size: 13px;
  color: var(--color-label);
  word-break: break-word;
}

/* ---- 8. Estados / banners -------------------------------------------------- */
.status {
  display: none;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.4;
}

.status--visible { display: flex; }

.status--success { background: var(--tint-green); color: #1E7B34; }
.status--error { background: var(--tint-red); color: #C4281B; }
.status--warning { background: var(--tint-orange); color: #9A5B00; }
.status--info { background: var(--tint-blue); color: #0056B3; }

@media (prefers-color-scheme: dark) {
  .status--success { color: #4FE07E; }
  .status--error { color: #FF6961; }
  .status--warning { color: #FFB340; }
  .status--info { color: #6EB2FF; }
}

/* ---- 9. Barra de progreso --------------------------------------------------- */
.progress {
  display: none;
  flex-direction: column;
  gap: var(--space-2);
}

.progress--visible { display: flex; }

.progress__track {
  width: 100%;
  height: 8px;
  background: var(--color-separator);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  width: 0%;
  background: var(--color-blue);
  border-radius: var(--radius-full);
  transition: width var(--duration-base) var(--ease-standard);
}

/* Fase de "procesando en el servidor": ya no hay % real que mostrar
   (la subida terminó pero la respuesta todavía no llegó), así que en vez
   de mentir con un 100% quieto usamos una barra indeterminada. */
.progress__fill--indeterminate {
  width: 40% !important;
  background: linear-gradient(90deg, transparent, var(--color-blue), transparent);
  animation: progress-indeterminate 1.2s ease-in-out infinite;
}

@keyframes progress-indeterminate {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(250%); }
}

.progress__label {
  align-self: flex-end;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-label-secondary);
}

/* ---- 10. Listas de resultados / descargas ---------------------------------- */
.result-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.result-list__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-secondary);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-standard);
}

.result-list__item:hover { background: var(--color-separator); }

.result-list__icon { color: var(--color-blue); flex-shrink: 0; }

.result-list__link {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-label);
}

.result-list__empty {
  font-size: 13px;
  color: var(--color-label-tertiary);
  padding: var(--space-2) 0;
}

/* ---- 10b. Tablas (estado de índices / resultados de búsqueda) -------------- */
.data-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-separator);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}

.data-table th, .data-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-separator);
}

.data-table th {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-label-secondary);
  background: var(--color-surface-secondary);
  position: sticky;
  top: 0;
}

.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--color-surface-secondary); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
}

.badge--ok { background: var(--tint-green); color: #1E7B34; }
.badge--warn { background: var(--tint-orange); color: #9A5B00; }
.badge--error { background: var(--tint-red); color: #C4281B; }

@media (prefers-color-scheme: dark) {
  .badge--ok { color: #4FE07E; }
  .badge--warn { color: #FFB340; }
  .badge--error { color: #FF6961; }
}

.form__row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.form__row .form__group { flex: 1 1 160px; }

/* ---- 11. Divisores / navegación de pie ------------------------------------- */
.divider {
  height: 1px;
  background: var(--color-separator);
  border: none;
  margin: var(--space-2) 0;
}

.app-footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ---- 12. Panel de KPIs (obtener_costo) ------------------------------------- */
.card--compact { padding: var(--space-4) var(--space-5); }
.card--compact .section-title { margin: 0 0 var(--space-2); font-size: 0.95rem; }

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: var(--space-2);
}

.kpi-card {
  background: var(--color-surface-secondary);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.kpi-card__label {
  font-size: 0.68rem;
  color: var(--color-label-secondary);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kpi-card__value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-label);
  line-height: 1.2;
}

.kpi-card__value--empty {
  color: var(--color-label-tertiary);
  font-size: 0.85rem;
  font-weight: 500;
}

.kpi-card__sub {
  font-size: 0.7rem;
  color: var(--color-label-secondary);
}

.kpi-card--warn .kpi-card__value { color: #9A5B00; }
.kpi-card--error .kpi-card__value { color: #C4281B; }
.kpi-card--ok .kpi-card__value { color: #1E7B34; }

@media (prefers-color-scheme: dark) {
  .kpi-card--warn .kpi-card__value { color: #FFB340; }
  .kpi-card--error .kpi-card__value { color: #FF6961; }
  .kpi-card--ok .kpi-card__value { color: #4FE07E; }
}

.kpi-timestamp {
  font-size: 0.78rem;
  color: var(--color-label-secondary);
  margin: 0 0 var(--space-2);
}

.result-list__timestamp {
  font-size: 0.75rem;
  color: var(--color-label-tertiary);
  margin-left: auto;
  padding-left: var(--space-3);
  white-space: nowrap;
}