.ren-sidebar-layout {
  display: flex;
  min-height: 100dvh;
  background-color: var(--color-surface);
}

.ren-sidebar {
  --sidebar-width: var(--ren-sidebar-width, 16rem);
  --sidebar-collapsed-width: var(--ren-sidebar-collapsed-width, 4rem);

  width: var(--sidebar-width);
  flex-shrink: 0;
  background-color: var(--color-surface-sunken);
  border-inline-end: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: width var(--duration-enter) var(--ease-state-change), transform var(--duration-enter) var(--ease-state-change);
  overflow: hidden;
  z-index: 50;

  &[data-collapsed] {
    width: var(--sidebar-collapsed-width);

    & .ren-sidebar-item-text {
      opacity: 0;
      width: 0;
      overflow: hidden;
      transition: opacity var(--duration-enter) var(--ease-state-change), width var(--duration-enter) var(--ease-state-change);
    }

    & .ren-sidebar-section-label {
      opacity: 0;
      width: 0;
      overflow: hidden;
      transition: opacity var(--duration-enter) var(--ease-state-change), width var(--duration-enter) var(--ease-state-change);
    }

    & .ren-sidebar-item {
      justify-content: center;
      position: relative;

      &:hover::after {
        content: attr(data-tooltip);
        position: absolute;
        inset-inline-start: 100%;
        top: 50%;
        transform: translateY(-50%);
        margin-inline-start: var(--ren-space-2, 0.5rem);
        padding: var(--ren-space-2, 0.5rem) var(--ren-space-3, 0.75rem);
        background-color: var(--color-text);
        color: var(--color-surface);
        border-radius: 0.375rem;
        font-size: var(--ren-caption-size, 0.75rem);
        white-space: nowrap;
        z-index: 1000;
        pointer-events: none;
      }
    }
  }

  @media (max-width: 48rem) {
    position: fixed;
    top: 0;
    inset-inline-start: 0;
    height: 100dvh;
    width: var(--sidebar-width);
    transform: translateX(-100%);
    transition: transform var(--duration-enter) var(--ease-state-change);

    &[data-open] {
      transform: translateX(0);
      box-shadow: 4px 0 12px rgb(0 0 0 / 0.15);
    }

    &[data-collapsed] {
      transform: translateX(-100%);
      width: var(--sidebar-width);
    }
  }
}

.ren-sidebar-header {
  padding: var(--ren-space-3, 0.75rem) var(--ren-space-4, 1rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;

  @media (max-width: 48rem) {
    padding: var(--ren-space-3, 0.75rem) var(--ren-space-4, 1rem);
  }
}

.ren-sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--ren-space-2, 0.5rem);
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;

  &::-webkit-scrollbar {
    width: 6px;
  }

  &::-webkit-scrollbar-track {
    background: transparent;
  }

  &::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 3px;

    &:hover {
      background-color: var(--color-text-muted);
    }
  }
}

.ren-sidebar-footer {
  padding: var(--ren-space-3, 0.75rem) var(--ren-space-4, 1rem);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;

  @media (max-width: 48rem) {
    padding: var(--ren-space-3, 0.75rem) var(--ren-space-4, 1rem);
  }
}

.ren-sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--ren-space-1, 0.25rem);
}

.ren-sidebar-section {
  margin-top: var(--ren-space-4, 1rem);

  &:first-child {
    margin-top: 0;
  }
}

.ren-sidebar-section-label {
  padding: var(--ren-space-1, 0.25rem) var(--ren-space-3, 0.75rem);
  font-size: var(--ren-caption-size, 0.75rem);
  font-weight: 600;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity var(--duration-enter) var(--ease-state-change);
  white-space: nowrap;
  overflow: hidden;
}

.ren-sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--ren-space-3, 0.75rem);
  padding: var(--ren-space-2, 0.5rem) var(--ren-space-3, 0.75rem);
  border-radius: 0.375rem;
  color: var(--color-text-muted);
  font-size: var(--ren-label-size, 0.875rem);
  cursor: pointer;
  transition: background-color var(--duration-state) var(--ease-state-change), color var(--duration-state) var(--ease-state-change);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;

  &:hover {
    background-color: var(--color-fill);
    color: var(--color-text);
  }

  &:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
  }

  &.active,
  &[aria-current="page"] {
    background-color: var(--color-accent-subtle);
    color: var(--color-accent);
    font-weight: 500;

    & .ren-sidebar-item-icon {
      color: var(--color-accent);
    }
  }

  &[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
  }
}

.ren-sidebar-item-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: color var(--duration-state) var(--ease-state-change);
  display: flex;
  align-items: center;
  justify-content: center;
}

.ren-sidebar-item-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: opacity var(--duration-enter) var(--ease-state-change), width var(--duration-enter) var(--ease-state-change);
}

.ren-sidebar-divider {
  height: 1px;
  background-color: var(--color-separator);
  margin: var(--ren-space-2, 0.5rem) 0;
}

.ren-sidebar-toggle {
  background: none;
  border: none;
  padding: var(--ren-space-2, 0.5rem);
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
  border-radius: 0.375rem;
  transition: background-color var(--duration-state) var(--ease-state-change), color var(--duration-state) var(--ease-state-change);

  &:hover {
    background-color: var(--color-fill);
    color: var(--color-text);
  }

  &:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }

  @media (max-width: 48rem) {
    display: none;
  }
}

.ren-sidebar-main {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;

  &::-webkit-scrollbar {
    width: 6px;
  }

  &::-webkit-scrollbar-track {
    background: transparent;
  }

  &::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 3px;

    &:hover {
      background-color: var(--color-text-muted);
    }
  }

  @media (max-width: 48rem) {
    margin-inline-start: 0;
  }
}

.ren-sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgb(0 0 0 / 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-enter) var(--ease-state-change);
  z-index: 40;

  @media (max-width: 48rem) {
    .ren-sidebar[data-open] ~ & {
      opacity: 1;
      pointer-events: auto;
    }
  }
}

/* ═══ REDUCED MOTION ═══ */
@media (prefers-reduced-motion: reduce) {
  .ren-sidebar,
  .ren-sidebar * {
    animation-duration: 0ms !important;
    transition-duration: 0ms !important;
  }
}
/* Appearance API bridge */
.ren-sidebar { inline-size: var(--ren-sidebar-width, 260px); background: var(--ren-sidebar-bg, var(--color-surface-sunken)); border-color: var(--ren-sidebar-border, var(--color-border)); transition-duration: var(--ren-sidebar-duration, var(--duration-normal)); transition-timing-function: var(--ren-sidebar-easing, var(--ease-out)); }
.ren-sidebar.is-collapsed, .ren-sidebar[data-collapsed="true"] { inline-size: var(--ren-sidebar-collapsed-width, 60px); }
.ren-sidebar a, .ren-sidebar button { min-block-size: var(--ren-sidebar-item-height, var(--size-lg)); padding: var(--ren-sidebar-item-padding, var(--space-2) var(--space-3)); border-radius: var(--ren-sidebar-item-radius, var(--radius-md)); }
.ren-sidebar a[aria-current="page"], .ren-sidebar a[data-active] { background: var(--ren-sidebar-active-bg, var(--color-accent-subtle)); color: var(--ren-sidebar-active-color, var(--color-accent)); }

@media (any-pointer: coarse), (pointer: coarse) {
  .ren-sidebar-toggle {
    min-inline-size: var(--touch-min);
    min-block-size: var(--touch-min);
  }
}