/* ============================================================
   Layout de la aplicación: sidebar, topbar y área de contenido
   ============================================================ */

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------------------------------------------------------------
   Sidebar
   --------------------------------------------------------------- */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-border);
  height: 100vh;
  position: sticky;
  top: 0;
  transition: background-color var(--transition-base), border-color var(--transition-base),
    transform var(--transition-base);
  z-index: var(--z-sidebar);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-5) var(--space-4);
}

.sidebar-logo-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 var(--space-3);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-align: left;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.nav-item .icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.nav-item:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.nav-item:hover .icon {
  color: var(--color-text);
}

.nav-item.active {
  background: var(--color-primary-50);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.nav-item.active .icon {
  color: var(--color-primary);
}

.sidebar-spacer {
  flex: 1;
}

.sidebar-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  flex-shrink: 0;
  text-transform: uppercase;
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.user-email {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: calc(var(--z-sidebar) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.sidebar-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-toggle-btn {
  display: none;
}

/* ---------------------------------------------------------------
   Área principal (topbar + contenido)
   --------------------------------------------------------------- */
.app-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.app-topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
  height: var(--topbar-height);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0 var(--space-6);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.topbar-search {
  flex: 1;
  max-width: 420px;
}

.topbar-search .input-group .input {
  background: var(--color-surface);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.app-content {
  flex: 1;
  padding: var(--space-6);
}

.content-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.view-header h2 {
  margin: 0;
}

.view-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-top: 2px;
}

/* ---------------------------------------------------------------
   Responsive: sidebar colapsable en móvil
   --------------------------------------------------------------- */
@media (max-width: 1024px) {
  .app-content {
    padding: var(--space-5);
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    box-shadow: var(--shadow-xl);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-toggle-btn {
    display: inline-flex;
  }

  .app-topbar {
    padding: 0 var(--space-4);
    gap: var(--space-2);
  }

  .topbar-search {
    max-width: none;
  }

  .app-content {
    padding: var(--space-4);
  }
}

@media (max-width: 640px) {
  .topbar-search {
    display: none;
  }

  .app-content {
    padding: var(--space-3);
  }

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