.app-splash {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--fs-color-header-bg);
  color: var(--fs-color-text-inverse);
}

.app-splash-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--fs-space-md);
  padding: var(--fs-space-lg);
}

.app-splash-logo {
  height: 40px;
  width: auto;
  display: block;
}

.app-splash-text {
  margin: 0;
  font-size: var(--fs-text-sm);
  color: color-mix(in srgb, var(--fs-color-text-inverse) 75%, transparent);
}

.app-splash-loader {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 3px solid color-mix(in srgb, var(--fs-color-text-inverse) 25%, transparent);
  border-top-color: var(--fs-color-text-inverse);
  animation: app-splash-spin 0.8s linear infinite;
}

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

.update-banner {
  position: fixed;
  left: var(--fs-space-md);
  right: var(--fs-space-md);
  bottom: calc(var(--fs-space-md) + env(safe-area-inset-bottom));
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--fs-space-sm);
  padding: var(--fs-space-sm) var(--fs-space-md);
  border-radius: var(--fs-radius-md);
  background: var(--fs-color-surface-raised);
  border: 1px solid var(--fs-color-border);
  box-shadow: var(--fs-shadow-lg);
}

.update-banner-text {
  margin: 0;
  font-size: var(--fs-text-sm);
  color: var(--fs-color-text);
}

.update-banner-btn {
  flex-shrink: 0;
  padding: var(--fs-space-xs) var(--fs-space-md);
  font-size: var(--fs-text-sm);
}

.app {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--fs-space-sm) + env(safe-area-inset-top)) var(--fs-space-md) var(--fs-space-sm);
  border-bottom: 1px solid color-mix(in srgb, var(--fs-color-header-bg) 70%, white);
  background: var(--fs-color-header-bg);
}

.app-brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.app-brand-logo-wrap {
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.app-brand-logo {
  height: 36px;
  width: auto;
  display: block;
  object-fit: contain;
}

.login-brand {
  display: flex;
  justify-content: center;
  padding: var(--fs-space-md) var(--fs-space-md) 0;
}

.login-brand-logo {
  height: 40px;
  width: auto;
  display: block;
}

.app-main {
  padding-bottom: var(--fs-layout-bottom-scroll-padding);
}

.app-footer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: calc(72px + env(safe-area-inset-bottom));
  z-index: 1;
  pointer-events: none;
  text-align: center;
  padding: 0 var(--fs-space-md);
}

.app-version {
  margin: 0;
  font-size: var(--fs-text-xs);
  color: var(--fs-color-text-muted);
}

.app-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--fs-space-xs);
  padding: calc(var(--fs-space-md) + 4px) var(--fs-space-md) calc(var(--fs-space-xs) + env(safe-area-inset-bottom));
  border-top: 1px solid var(--fs-color-border);
  background: color-mix(in srgb, var(--fs-color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
}

.nav-fab-anchor {
  pointer-events: none;
}

.nav-fab {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--fs-layout-fab-size);
  height: var(--fs-layout-fab-size);
  border-radius: 50%;
  background: var(--fs-color-primary);
  box-shadow: var(--fs-shadow-lg);
  color: var(--fs-color-text-inverse);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  z-index: 2;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: background var(--fs-duration-fast) var(--fs-easing-default),
              box-shadow var(--fs-duration-fast) var(--fs-easing-default);
}

.nav-fab:active {
  background: var(--fs-color-primary-dark);
}

.nav-fab-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Confirmación de RFC: el FAB tapa el botón primario si queda visible */
#app:has(#upload-confirm-section:not([hidden])) .nav-fab {
  visibility: hidden;
  pointer-events: none;
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--fs-space-2xs);
  padding: var(--fs-space-xs);
  border-radius: var(--fs-radius-md);
  color: var(--fs-color-text-muted);
  transition: background var(--fs-duration-fast) var(--fs-easing-default),
              color var(--fs-duration-fast) var(--fs-easing-default);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.nav-tab .nav-label {
  font-size: var(--fs-text-xs);
  font-weight: var(--fs-weight-medium);
}

.nav-tab.active {
  color: var(--fs-color-primary);
  background: var(--fs-color-primary-surface);
}

.screen {
  padding: var(--fs-space-md);
  max-width: 600px;
  margin: 0 auto;
  min-height: 100dvh;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  .screen { max-width: 1100px; }
}

.screen-header {
  margin-bottom: var(--fs-space-md);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--fs-space-md);
}

.grid-kpi {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--fs-space-md);
}

@media (min-width: 1024px) {
  .grid-kpi { grid-template-columns: repeat(4, 1fr); }
}

.grid-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--fs-space-md);
}

@media (min-width: 640px) {
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
}

.row {
  display: flex;
  gap: var(--fs-space-sm);
  flex-wrap: wrap;
}