@layer components {
  .app-layout {
    display: flex;
    min-height: 100dvh;
  }

  .app-layout--auth {
    flex-direction: row;
  }

  @media (max-width: 768px) {
    .app-layout--auth {
      flex-direction: column;
    }
  }

  /* Sidebar */
  .app-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--color-canvas-raised);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: var(--z-nav);
    overflow-y: auto;
  }

  .app-sidebar__brand {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1.25rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-ink);
  }

  .app-sidebar__brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 0.75rem;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 0.9375rem;
    font-weight: 700;
    box-shadow: inset 0 0 0 1px rgba(232, 89, 12, 0.08);
  }

  .app-sidebar__brand-label {
    min-width: 0;
  }

  .app-sidebar__brand-meta {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
  }

  .app-sidebar__brand-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-ink);
  }

  .app-sidebar__brand-subtitle {
    font-family: var(--font-mono);
    font-size: var(--text-label-mono);
    letter-spacing: var(--letter-spacing-label);
    text-transform: uppercase;
    color: var(--color-ink-light);
  }

  .app-sidebar__search {
    padding: 0 var(--space-5) var(--space-4);
  }

  .app-sidebar__search-button {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    min-height: 2.625rem;
    padding: 0 var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-canvas);
    color: var(--color-ink-medium);
    font: inherit;
    cursor: pointer;
  }

  .app-sidebar__search-kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 1.5rem;
    padding: 0 0.375rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-canvas-raised);
    font-size: var(--text-xs);
  }

  .app-sidebar__section-label {
    padding: 0.75rem 1.25rem 0.375rem;
    font-family: var(--font-mono);
    font-size: var(--text-label-mono);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-label);
    color: var(--color-ink-light);
  }

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

  .app-sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0.625rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-ink-dark);
    transition: background-color 0.15s ease, color 0.15s ease;

    &:hover {
      background-color: var(--color-canvas);
      color: var(--color-ink);
    }

    &.active {
      background-color: var(--color-primary-light);
      color: var(--color-primary);
      font-weight: 600;
    }

    & svg {
      width: 1.125rem;
      height: 1.125rem;
      flex-shrink: 0;
      opacity: 0.7;
    }

    &.active svg {
      opacity: 1;
    }
  }

  .app-sidebar__link-label {
    min-width: 0;
    white-space: nowrap;
  }

  .app-sidebar__separator {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--space-3) var(--space-5);
  }

  .app-sidebar__footer {
    margin-top: auto;
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
  }

  .app-sidebar__locale {
    font-size: var(--text-small);
    color: var(--color-ink-medium);
  }

  .locale-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-small);
  }

  .locale-toggle__link {
    color: var(--color-ink-medium);
    text-decoration: none;
  }

  .locale-toggle__link:hover {
    color: var(--color-primary);
    text-decoration: underline;
  }

  .locale-toggle__current {
    font-weight: 600;
    color: var(--color-ink);
  }

  .locale-toggle-wrap--auth {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    z-index: 10;
  }

  .app-sidebar__usage {
    margin-top: auto;
    padding: var(--space-4) var(--space-5) 0;
  }

  .usage-bar {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.875rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(248, 248, 246, 0.96) 100%);
    box-shadow: var(--shadow-card);
  }

  .usage-bar__header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-2);
  }

  .usage-bar__label {
    color: var(--color-ink-light);
  }

  .usage-bar__value {
    font-size: var(--text-small);
    font-weight: 600;
    color: var(--color-ink);
  }

  .usage-bar__track {
    overflow: hidden;
    height: 0.5rem;
    border-radius: 999px;
    background: var(--color-canvas-inset);
  }

  .usage-bar__fill {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #22c55e 0%, var(--color-primary) 72%, #ef4444 100%);
  }

  .usage-bar__caption {
    font-size: var(--text-small);
    color: var(--color-ink-medium);
  }

  .app-sidebar__menu {
    position: relative;
  }

  .app-sidebar__menu[open] .app-sidebar__menu-summary {
    background: var(--color-canvas);
  }

  .app-sidebar__menu-summary {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
  }

  .app-sidebar__menu-summary::-webkit-details-marker {
    display: none;
  }

  .app-sidebar__avatar {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius-full);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-small);
    font-weight: 600;
    flex-shrink: 0;
  }

  .app-sidebar__user {
    flex: 1;
    min-width: 0;
  }

  .app-sidebar__user-name {
    font-size: var(--text-small);
    font-weight: 500;
    color: var(--color-ink);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .app-sidebar__signout {
    color: var(--color-ink-light);
    transition: color 0.15s ease;
    flex-shrink: 0;

    &:hover {
      color: var(--color-ink);
    }

    & svg {
      width: 1.125rem;
      height: 1.125rem;
    }
  }

  .app-sidebar__menu-sheet {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(100% + var(--space-3));
    width: auto;
    max-width: calc(100vw - 2rem);
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-canvas-raised);
    box-shadow: var(--shadow-elevated);
  }

  .app-sidebar__menu-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
  }

  /* Main content area */
  .app-body {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
  }

  .app-main {
    flex: 1;
    padding: var(--space-8);
    max-width: none;
    width: 100%;
    transition: opacity 0.18s ease;
  }

  .app-main--full {
    max-width: none;
    padding: 0;
  }

  .app-main--padded {
    padding: var(--space-8);
  }

  .auth-card {
    box-shadow: var(--shadow-elevated);
  }

  .mobile-nav {
    display: none;
  }

  .toast-stack {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    width: min(24rem, calc(100vw - 2rem));
    z-index: 90;
    pointer-events: none;
  }

  .toast {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-elevated);
    color: var(--color-ink);
    font-size: var(--text-small);
    backdrop-filter: blur(14px);
    pointer-events: auto;
    transition: opacity 0.18s ease, transform 0.18s ease;
  }

  .toast--notice {
    border-color: #bbf7d0;
    background: rgba(240, 253, 244, 0.98);
  }

  .toast--alert {
    border-color: #fecaca;
    background: rgba(254, 242, 242, 0.98);
  }

  .toast.is-closing {
    opacity: 0;
    transform: translateY(-8px);
  }

  .toast__body {
    flex: 1;
    line-height: 1.5;
  }

  .toast__close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 1.875rem;
    height: 1.875rem;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.85);
    color: var(--color-ink-medium);
    line-height: 1;
    cursor: pointer;
  }

  @media (min-width: 769px) and (max-width: 1280px) {
    .app-sidebar {
      width: 84px;
    }

    .app-sidebar__brand,
    .app-sidebar__search,
    .app-sidebar__section-label,
    .app-sidebar__footer {
      padding-left: var(--space-3);
      padding-right: var(--space-3);
    }

    .app-sidebar__brand {
      justify-content: center;
    }

    .app-sidebar__brand-label,
    .app-sidebar__brand-meta,
    .app-sidebar__search-button > span:first-child,
    .app-sidebar__search-kbd,
    .app-sidebar__link-label,
    .app-sidebar__user,
    .app-sidebar__menu-summary > svg {
      display: none;
    }

    .app-sidebar__search-button,
    .app-sidebar__link,
    .app-sidebar__menu-summary {
      justify-content: center;
    }

    .app-sidebar__search-button,
    .app-sidebar__link {
      padding-left: 0.625rem;
      padding-right: 0.625rem;
    }

    .app-body {
      margin-left: 84px;
    }
  }

  /* Responsive: collapse sidebar on small screens */
  @media (max-width: 768px) {
    .app-sidebar {
      transform: translateX(-100%);
      transition: transform 0.25s var(--ease-out-expo);
    }

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

    .app-body {
      margin-left: 0;
      padding-bottom: 5.5rem;
    }

    .mobile-nav {
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 0.5rem;
      padding: 0.75rem;
      border-top: 1px solid var(--color-border);
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(14px);
      z-index: calc(var(--z-nav) + 1);
    }

    .mobile-nav__link {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 0.35rem;
      min-height: 3.75rem;
      padding: 0.5rem;
      border-radius: var(--radius-md);
      color: var(--color-ink-medium);
      font-size: var(--text-xs);
      font-weight: 600;
      text-align: center;
    }

    .mobile-nav__link svg {
      width: 1rem;
      height: 1rem;
    }

    .mobile-nav__link.active {
      background: var(--color-primary-light);
      color: var(--color-primary);
    }

    .mobile-nav__locale {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: var(--text-xs);
    }

    .mobile-nav__locale .locale-toggle {
      flex-direction: column;
      gap: 0.25rem;
    }

    .mobile-nav__locale .locale-toggle__link,
    .mobile-nav__locale .locale-toggle__current {
      font-size: var(--text-xs);
    }
  }
}