/* ==========================================================================
   Layout — I4G Integration Tracker
   Grid, header, navigation, main content, aside, footer.
   Responsive breakpoints: 768px, 1024px, 1440px.
   Color-blind safe palette combining color with icons/labels.
   Validates: Requirements 17.1, 17.4, 17.5, 17.7, 10.2
   ========================================================================== */

/* --- App Layout Grid --- */
.app-layout {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  grid-template-columns: 1fr;
  min-height: 100vh;
}

/* --- Header (sticky) --- */
#app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  background-color: var(--color-brand);
  border-bottom: none;
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

.app-title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-connect-btn--connected {
  color: #A3D9A5;
  border-color: #A3D9A5;
}

.header-alert-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 var(--space-1);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  background-color: var(--color-error);
  border-radius: var(--radius-full);
}

.header-lang-btn {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-1) var(--space-3);
  color: var(--color-text-inverse);
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-sm);
  opacity: 0.9;
  transition: opacity var(--transition-fast), background var(--transition-fast);
  letter-spacing: 0.04em;
}

.header-lang-btn:hover {
  opacity: 1;
  background: rgba(255,255,255,0.25);
}

.header-dark-toggle {
  font-size: var(--font-size-h4);
  padding: var(--space-1) var(--space-2);
  color: var(--color-text-inverse);
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.header-dark-toggle:hover {
  opacity: 1;
}

/* Header buttons override for dark header */
#app-header .btn--primary {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-text-inverse);
}

#app-header .btn--primary:hover:not(:disabled) {
  background-color: rgba(255, 255, 255, 0.25);
}

#app-header .btn--secondary {
  background-color: transparent;
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-text-inverse);
}

#app-header .btn--secondary:hover:not(:disabled) {
  background-color: rgba(255, 255, 255, 0.1);
}

/* --- LED Connection Indicator --- */
.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-led {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.led {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.led--online {
  background-color: #3FB950;
  box-shadow: 0 0 6px #3FB950, 0 0 12px rgba(63, 185, 80, 0.4);
  animation: led-pulse 2s ease-in-out infinite;
}

.led--offline {
  background-color: #8B949E;
  box-shadow: none;
}

.led--connecting {
  background-color: #F0A500;
  box-shadow: 0 0 6px #F0A500, 0 0 12px rgba(240, 165, 0, 0.4);
  animation: led-pulse 0.8s ease-in-out infinite;
}

.led-label {
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.7);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@keyframes led-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* --- Header Buttons (visible on dark header) --- */
.header-refresh-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform 0.3s ease;
}

.header-refresh-btn:hover {
  background-color: rgba(255, 255, 255, 0.18);
  color: #fff;
}

.header-refresh-btn:active svg {
  animation: spin-once 0.4s linear;
}

@keyframes spin-once {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.header-connect-btn {
  background-color: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-text-inverse);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-small);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.header-connect-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.header-connect-btn--connecting,
.header-connect-btn--connecting:hover {
  background-color: rgba(240, 165, 0, 0.15);
  border-color: rgba(240, 165, 0, 0.5);
  color: #F0A500;
  cursor: wait;
  opacity: 0.85;
}

/* --- Navigation (horizontal tabs — clean, minimal) --- */
#app-nav {
  background-color: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
}

.nav-tabs,
.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  list-style: none;
}

.nav-tab,
.nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.nav-tab:hover,
.nav-link:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-tab--active,
.nav-tab[aria-current="page"],
.nav-link--active,
.nav-link[aria-current="page"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

/* Empuja el botón DC/Exit al extremo derecho */
.nav-item--end {
  margin-left: auto;
}

/* Botón "Módulo DC" — discreto, al costado derecho */
.nav-dc-btn {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
  white-space: nowrap;
}

.nav-dc-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(var(--color-primary-rgb, 56, 139, 253), 0.08);
  text-decoration: none;
}

/* Botón "← Volver al Dashboard" */
.nav-exit-dc-btn {
  background: none;
  border: none;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-exit-dc-btn:hover {
  color: var(--color-text-primary);
}

/* --- Main Content Area --- */
#main-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--space-4);
  width: 100%;
}

/* --- Aside Panel (Alerts) --- */
#alerts-panel {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-4) var(--space-4);
  width: 100%;
}

/* --- Footer --- */
#app-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  text-align: center;
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Mobile (< 768px) */
@media (max-width: 767px) {
  .header-content {
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
  }

  .app-title {
    font-size: var(--font-size-h4);
  }

  .header-actions {
    width: 100%;
    justify-content: center;
  }

  .nav-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 var(--space-2);
  }

  .nav-tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-small);
  }

  #main-content {
    padding: var(--space-2);
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .header-content {
    padding: var(--space-3) var(--space-4);
  }

  #main-content {
    padding: var(--space-3);
  }
}

/* Desktop (1024px - 1439px) */
@media (min-width: 1024px) {
  .app-title {
    font-size: var(--font-size-h2);
  }

  #main-content {
    padding: var(--space-4) var(--space-5);
  }
}

/* Wide Desktop (≥ 1440px) */
@media (min-width: 1440px) {
  .header-content,
  #main-content,
  #alerts-panel,
  .nav-tabs {
    max-width: 1440px;
  }
}

/* --- User chip en el header --- */
.header-user-chip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
}

.header-user-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.header-user-initials {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary, #388bfd);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header-user-name {
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.85);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
}

.header-signout-btn {
  background: none;
  border: none;
  padding: 2px;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.5);
  display: flex;
  align-items: center;
  transition: color var(--transition-fast);
  line-height: 0;
}

.header-signout-btn:hover {
  color: rgba(255, 255, 255, 0.9);
}

/* --- Snapshot / Offline Banner --- */
.snapshot-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(240, 165, 0, 0.15);
  border-top: 1px solid rgba(240, 165, 0, 0.35);
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.85);
}

.snapshot-banner__icon {
  flex-shrink: 0;
  font-size: 13px;
}

.snapshot-banner__text {
  flex: 1;
}

.snapshot-banner__btn {
  flex-shrink: 0;
  padding: 2px 10px;
  border-radius: 4px;
  border: 1px solid rgba(240, 165, 0, 0.6);
  background: transparent;
  color: rgba(255, 255, 255, 0.9);
  cursor: pointer;
  font-size: var(--font-size-small);
  transition: background var(--transition-fast);
}

.snapshot-banner__btn:hover {
  background: rgba(240, 165, 0, 0.25);
}

/* Inline variant — used inside views (e.g. SOX) instead of full-width header band */
.snapshot-banner--inline {
  border-top: none;
  border: 1px solid rgba(240, 165, 0, 0.35);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  background: rgba(240, 165, 0, 0.10);
  color: var(--color-text-secondary);
}