.app-navbar {
    width: calc(100% - 32px);
    margin: 18px auto 12px;
    background: var(--surface-glass-2);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
  }

  .app-navbar.is-sticky {
    position: sticky;
    top: 8px;
    z-index: 120;
  }

  .navbar-inner {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr) auto;
    align-items: center;
    gap: 14px;
    padding: 11px 14px;
  }

  .navbar-brand-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-width: 0;
  }

  .navbar-brand {
    text-decoration: none;
    color: #60a5fa;
    font-weight: var(--font-weight-bold);
    font-size: var(--text-md);
  }

  .feature-search-form {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 52px;
    gap: var(--space-2);
  }

  .feature-search-input {
    width: 100%;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 0 var(--space-3);
    min-height: 40px;
    background: var(--surface-1);
    color: var(--shell-ink);
    color-scheme: dark;
  }

  .feature-search-input::placeholder {
    color: #475569;
  }

  .feature-search-button {
    min-height: 40px;
    border: none;
    border-radius: var(--radius-md);
    padding: 0 13px;
    background: var(--brand);
    color: #fff;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
  }

  .navbar-user {
    display: flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-lg);
    padding: var(--space-1) 6px;
  }

  .navbar-user:hover {
    background: rgba(255, 255, 255, 0.05);
  }

  .navbar-user:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
  }

  .navbar-avatar-image,
  .navbar-avatar-fallback {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-default);
    flex: 0 0 auto;
  }

  .navbar-avatar-fallback {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-soft);
    color: var(--brand);
    font-size: var(--text-sm);
    font-weight: var(--font-weight-bold);
  }

  .navbar-user-meta {
    display: grid;
    min-width: 0;
  }

  .navbar-user-meta strong,
  .navbar-user-meta span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .navbar-user-meta strong {
    font-size: var(--text-sm);
  }

  .navbar-user-meta span {
    font-size: var(--text-xs);
    color: var(--shell-muted);
  }

  .navbar-user-cluster {
    display: flex;
    align-items: center;
    gap: 4px;
  }

  .navbar-icon-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 5px;
    border-radius: var(--radius-lg);
    color: inherit;
    text-decoration: none;
  }

  .navbar-icon-btn:hover {
    background: rgba(255, 255, 255, 0.05);
  }

  .navbar-icon-btn:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
  }

  .navbar-badge {
    position: absolute;
    top: 1px;
    right: 1px;
    min-width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    background: var(--brand);
    color: #fff;
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 3px;
    line-height: 1;
    pointer-events: none;
  }

  .navbar-guest-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    justify-self: end;
    width: auto;
    white-space: nowrap;
    min-height: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--brand);
    background: var(--brand);
    color: #fff;
    font-size: var(--text-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-decoration: none;
    padding: 0 var(--space-4);
    transition: background var(--duration-base) var(--ease-default),
                border-color var(--duration-base) var(--ease-default),
                transform var(--duration-base) var(--ease-default);
  }

  .navbar-guest-cta:hover {
    background: var(--brand-hover);
    border-color: var(--brand-hover);
    transform: translateY(-1px);
  }

  .navbar-guest-cta:active {
    transform: translateY(0);
  }

  .navbar-guest-cta:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
  }

  .shell {
    --sidebar-width-expanded: 270px;
    --sidebar-width-collapsed: 72px;
    width: calc(100% - 32px);
    margin: var(--space-4) auto 18px;
    display: grid;
    grid-template-columns: var(--sidebar-width-expanded) minmax(0, 1fr);
    align-items: start;
    gap: 18px;
    transition: grid-template-columns var(--duration-fast) var(--ease-default);
  }

  .shell.is-sidebar-collapsed {
    grid-template-columns: var(--sidebar-width-collapsed) minmax(0, 1fr);
  }

  .sidebar {
    background: var(--surface-glass-2);
    border: 1px solid var(--border-default);
    border-right: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 18px;
    position: sticky;
    top: 14px;
    align-self: start;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
  }

  .sidebar-toggle-row {
    display: flex;
    justify-content: flex-start;
    margin-bottom: var(--space-2);
  }

  .sidebar-toggle-btn {
    padding: 8px;
    line-height: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    background: var(--surface-1);
    color: var(--shell-muted);
    cursor: pointer;
    transition: background var(--duration-base), border-color var(--duration-base), color var(--duration-base);
  }

  .sidebar-toggle-btn:hover {
    background: var(--sidebar-active-bg);
    border-color: var(--border-strong);
    color: var(--brand);
  }

  .sidebar-toggle-btn:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
  }

  .sidebar-toggle-icon {
    display: block;
    width: 16px;
    height: 16px;
    min-width: 16px;
    min-height: 16px;
    flex: 0 0 16px;
    flex-shrink: 0;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .sidebar-toggle-glyph {
    display: block;
    line-height: 0;
  }

  /* Desktop: single panel icon; mobile close icon stays hidden */
  .sidebar-toggle-btn .sidebar-toggle-glyph--desktop-expanded {
    display: block;
  }

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

  .sidebar-section {
    margin-top: 0;
  }

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

  .sidebar-section-title {
    margin: 0 0 var(--space-2);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--shell-muted);
  }

  .sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: #cbd5e1;
    border: 1px solid transparent;
    border-radius: 9px;
    padding: 9px 10px;
    font-size: var(--text-base);
    margin-bottom: 5px;
    transition: color var(--duration-base), background var(--duration-base), border-color var(--duration-base);
  }

  .sidebar nav .sidebar-link:last-child {
    margin-bottom: 0;
  }

  .sidebar-link-profile {
    width: 100%;
  }

  .sidebar-link-icon {
    width: 16px;
    height: 16px;
    flex: 0 0 auto;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .sidebar-link-label {
    min-width: 0;
  }

  .sidebar-profile-avatar-wrap {
    display: inline-flex;
    flex: 0 0 auto;
  }

  .sidebar-profile-avatar {
    width: 22px;
    height: 22px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-default);
    flex: 0 0 auto;
  }

  .sidebar-profile-avatar-fallback {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-soft);
    color: var(--brand);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-bold);
  }

  .sidebar-link:hover {
    background: var(--sidebar-active-bg);
    border-color: var(--border-default);
    color: var(--shell-ink);
  }

  .sidebar-link.is-active {
    border-color: rgba(59, 158, 255, 0.4);
    background: rgba(59, 158, 255, 0.15);
    color: var(--brand);
    font-weight: var(--font-weight-semibold);
  }

  .shell.is-sidebar-collapsed .sidebar {
    padding: 18px var(--space-2);
  }

  .shell.is-sidebar-collapsed .sidebar-toggle-row {
    justify-content: center;
  }

  .shell.is-sidebar-collapsed .sidebar-link {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
  }

  .shell.is-sidebar-collapsed .sidebar-link-label {
    display: none;
  }

  .shell.is-sidebar-collapsed .sidebar-section-title {
    visibility: hidden;
  }

  .content {
    display: grid;
    align-content: start;
    gap: 14px;
  }

  /* Mobile hamburger: hidden by default (desktop) */
  .navbar-mobile-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    min-height: 0;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: var(--surface-1);
    color: var(--shell-muted);
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
  }

  .navbar-mobile-menu-btn svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    pointer-events: none;
  }

  .navbar-mobile-menu-btn:hover {
    background: var(--brand-soft);
    border-color: rgba(59, 158, 255, 0.3);
    color: var(--brand);
  }

  /* Sidebar mobile overlay backdrop */
  .sidebar-mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 1099;
    cursor: pointer;
  }

  .sidebar-mobile-overlay.is-visible {
    display: block;
  }

  /* Bottom tab bar — hidden on desktop/tablet, shown on mobile */
  .bottom-nav {
    display: none;
  }

  @media (min-width: 641px) and (max-width: 1080px) {
    .config-layout {
      grid-template-columns: 1fr;
    }

    .navbar-inner {
      grid-template-columns: 1fr;
    }

    .navbar-guest-cta {
      width: fit-content;
      min-height: 40px;
      justify-self: start;
    }

    .feature-search-form {
      display: none;
    }

    .navbar-user {
      display: none;
    }

    /* Shell: bloque simple, el sidebar ya no ocupa columna */
    .shell {
      display: block;
    }

    .shell.is-sidebar-collapsed {
      display: block;
    }

    /* Hamburger visible en tablet */
    .navbar-mobile-menu-btn {
      display: inline-flex;
    }

    /* Sidebar: drawer off-screen por defecto */
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      width: 280px;
      border-radius: 0;
      border-right: 1px solid var(--border-default);
      transform: translateX(-100%);
      transition: transform var(--duration-slow) var(--ease-default),
                  box-shadow var(--duration-slow) var(--ease-default);
      z-index: 1100;
      overflow-y: auto;
      overscroll-behavior: contain;
    }

    /* Drawer abierto */
    .sidebar.is-mobile-open {
      transform: translateX(0);
      box-shadow: var(--shadow-xl);
    }

    /* Mostrar botón close dentro del drawer en tablet */
    .sidebar-toggle-row {
      display: flex;
      justify-content: flex-end;
    }

    /* En tablet: mostrar ✕, ocultar iconos desktop */
    .sidebar-toggle-btn .sidebar-toggle-glyph--desktop-expanded {
      display: none;
    }

    .sidebar-toggle-btn .sidebar-toggle-glyph--close {
      display: block;
    }

    /* Resetear estado collapsed en tablet (siempre full width) */
    .shell.is-sidebar-collapsed .sidebar {
      width: 280px;
    }

    .shell.is-sidebar-collapsed .sidebar-link {
      justify-content: flex-start;
      padding-left: 10px;
      padding-right: 10px;
    }

    .shell.is-sidebar-collapsed .sidebar-link-label {
      display: inline;
    }

    .shell.is-sidebar-collapsed .sidebar-profile-avatar-wrap {
      display: inline-flex;
    }

    .filter-grid {
      grid-template-columns: 1fr;
    }

    .hero {
      padding: 22px;
    }

    .connections-grid {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 640px) {
    /* Navbar simplificado — solo logo */
    .navbar-inner {
      grid-template-columns: 1fr;
      padding: var(--space-2) var(--space-3);
    }

    .feature-search-form {
      display: none;
    }

    .navbar-user {
      display: none;
    }

    .navbar-mobile-menu-btn {
      display: none;
    }

    .navbar-guest-cta {
      width: 100%;
      min-height: 44px;
      justify-self: stretch;
    }

    /* Shell: bloque simple */
    .shell {
      display: block;
      /* Espacio extra para el bottom nav */
      padding-bottom: calc(60px + env(safe-area-inset-bottom));
    }

    .shell.is-sidebar-collapsed {
      display: block;
    }

    /* Sidebar y overlay ocultos — bottom nav toma el control */
    .sidebar,
    .sidebar-mobile-overlay {
      display: none !important;
    }

    /* Bottom tab bar */
    .bottom-nav {
      display: flex;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 60px;
      background: var(--surface-glass-2);
      border-top: 1px solid var(--border-default);
      backdrop-filter: blur(12px);
      z-index: 1100;
      justify-content: space-around;
      align-items: stretch;
      padding-bottom: env(safe-area-inset-bottom);
    }

    .bottom-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 3px;
      flex: 1;
      text-decoration: none;
      color: var(--shell-muted);
      padding: var(--space-2) 0;
      border-radius: 0;
      transition: color var(--duration-base);
      min-height: 44px;
    }

    .bottom-nav-item.is-active {
      color: var(--brand);
    }

    .bottom-nav-item svg {
      width: 22px;
      height: 22px;
      stroke: currentColor;
      stroke-width: 2;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .bottom-nav-label {
      font-size: var(--text-xs);
      font-weight: var(--font-weight-medium);
      line-height: 1;
    }
  }