/* ============================================
   UIX — Extended Components
   ============================================
   Companion to ui.css — uses the same custom
   properties, conventions, and icon system.
   ============================================ */


/* ============================================
   Input OTP — One-time password input slots
   ============================================ */

.ui-otp {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ui-font-mono);

  & .ui-otp-slot {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 3.25rem;
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    background: var(--ui-surface);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ui-text);
    text-align: center;
    caret-color: var(--ui-primary);
    outline: none;
    box-sizing: border-box;
    transition: border-color var(--ui-transition);
    font-family: inherit;

    &:focus {
      border-color: var(--ui-primary);
    }

    &::placeholder {
      color: var(--ui-border);
    }

    &:disabled {
      opacity: 0.5;
      cursor: not-allowed;
      background: var(--ui-bg-subtle);
    }
  }

  & .ui-otp-separator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 0.75rem;
    color: var(--ui-text-muted);
    font-size: 1rem;

    &::before {
      content: "\2013";
    }
  }

  /* --- States --- */

  &.error .ui-otp-slot {
    border-color: var(--ui-danger);
  }

  &.success .ui-otp-slot {
    border-color: var(--ui-success);
  }

  /* --- Sizes --- */

  &.sm {
    gap: 0.375rem;

    & .ui-otp-slot {
      width: 2.25rem;
      height: 2.625rem;
      font-size: 1rem;
    }

    & .ui-otp-separator {
      width: 0.5rem;
      font-size: 0.875rem;
    }
  }

  &.lg {
    gap: 0.625rem;

    & .ui-otp-slot {
      width: 3.25rem;
      height: 3.75rem;
      font-size: 1.5rem;
    }

    & .ui-otp-separator {
      width: 1rem;
      font-size: 1.125rem;
    }
  }

  /* --- Underline variant --- */

  &.underline .ui-otp-slot {
    border: none;
    border-bottom: 2px solid var(--ui-border);
    border-radius: 0;

    &:focus {
      border-bottom-color: var(--ui-primary);
    }
  }

  &.underline.error .ui-otp-slot {
    border-bottom-color: var(--ui-danger);
  }

  /* --- Filled variant --- */

  &.filled .ui-otp-slot {
    background: var(--ui-bg-subtle);
    border-color: transparent;

    &:focus {
      border-color: var(--ui-primary);
      background: var(--ui-surface);
    }
  }
}


/* ============================================
   Timeline — Chronological event list
   ============================================ */

.ui-timeline {
  display: grid;
  grid-auto-rows: 1fr;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  padding: 0;
  margin: 0;
  list-style: none;

  /* --- Reverse (bottom to top) --- */

  &.reverse {
    display: flex;
    flex-direction: column-reverse;

    & .ui-timeline-item {
      &:not(:last-child)::before {
        display: none;
      }

      &:not(:first-child)::before {
        content: "";
        position: absolute;
        left: calc(0.625rem - 0.5px);
        top: 1.5rem;
        bottom: 0;
        width: 1px;
        background: var(--ui-border);
      }
    }
  }

  /* --- Sizes --- */

  &.sm {
    & .ui-timeline-item {
      padding-bottom: 1rem;

      &:not(:last-child)::before {
        left: calc(0.5rem - 0.5px);
      }
    }

    & .ui-timeline-dot {
      width: 1rem;
      height: 1rem;
      font-size: 0.5rem;

      & .ui-icon {
        font-size: 0.625rem;
      }
    }

    & .ui-timeline-title {
      font-size: 0.8125rem;
    }
  }

  &.lg {
    & .ui-timeline-item {
      padding-bottom: 2rem;
      gap: 1rem;

      &:not(:last-child)::before {
        left: calc(0.875rem - 0.5px);
        top: 2rem;
      }
    }

    & .ui-timeline-dot {
      width: 1.75rem;
      height: 1.75rem;
      font-size: 0.75rem;

      & .ui-icon {
        font-size: 1rem;
      }
    }

    & .ui-timeline-title {
      font-size: 1rem;
    }
  }
}

.ui-timeline-item {
  display: flex;
  gap: 0.75rem;
  position: relative;
  padding-bottom: 1.5rem;

  /* Vertical line */
  &:not(:last-child)::before {
    content: "";
    position: absolute;
    left: calc(0.625rem - 0.5px);
    top: 1.5rem;
    bottom: 0;
    width: 1px;
    background: var(--ui-border);
  }

  & .ui-timeline-dot {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    border-radius: var(--ui-radius-full);
    background: var(--ui-bg-subtle);
    border: 2px solid var(--ui-border);
    flex-shrink: 0;
    margin-top: 0.125rem;
    z-index: 1;
    font-size: 0.625rem;

    & .ui-icon {
      font-size: 0.75rem;
    }

    &.primary {
      background: var(--ui-primary-light);
      border-color: var(--ui-primary);
      color: var(--ui-primary);
    }

    &.success {
      background: var(--ui-success-light);
      border-color: var(--ui-success);
      color: var(--ui-success);
    }

    &.danger {
      background: var(--ui-danger-light);
      border-color: var(--ui-danger);
      color: var(--ui-danger);
    }

    &.warning {
      background: var(--ui-warning-light);
      border-color: var(--ui-warning);
      color: var(--ui-warning);
    }

    &.solid {
      background: var(--ui-primary);
      border-color: var(--ui-primary);
      color: var(--ui-primary-text);

      &.success {
        background: var(--ui-success);
        border-color: var(--ui-success);
        color: var(--ui-success-text);
      }

      &.danger {
        background: var(--ui-danger);
        border-color: var(--ui-danger);
        color: var(--ui-danger-text);
      }

      &.warning {
        background: var(--ui-warning);
        border-color: var(--ui-warning);
        color: var(--ui-warning-text);
      }
    }
  }

  & .ui-timeline-content {
    flex: 1;
    min-width: 0;
  }

  & .ui-timeline-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--ui-text);
    line-height: 1.4;
  }

  & .ui-timeline-time {
    font-size: 0.75rem;
    color: var(--ui-text-muted);
    margin-top: 0.125rem;
  }

  & .ui-timeline-body {
    margin-top: 0.375rem;
    font-size: var(--ui-font-size);
    color: var(--ui-text-muted);
    line-height: var(--ui-line-height);
  }
}


/* ============================================
   Stepper — Multi-step progress
   ============================================ */

.ui-stepper {
  display: flex;
  align-items: flex-start;
  counter-reset: ui-step;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);

  /* --- Vertical layout --- */

  &.vertical {
    flex-direction: column;

    & .ui-step {
      flex-direction: row;
      flex: none;
      align-items: flex-start;
      padding-bottom: 1.5rem;

      &:not(:last-child)::after {
        content: "";
        position: absolute;
        left: calc(1rem - 1px);
        right: auto;
        top: 2rem;
        bottom: 0;
        width: 2px;
        height: auto;
      }

      & .ui-step-content {
        text-align: left;
        margin-top: 0;
        margin-left: 0.625rem;
      }
    }

    /* --- Vertical reverse (bottom to top) --- */

    &.reverse {
      flex-direction: column-reverse;

      & .ui-step {
        &:not(:last-child)::after {
          display: none;
        }

        &:not(:first-child)::after {
          content: "";
          position: absolute;
          left: calc(1rem - 1px);
          right: auto;
          top: 2rem;
          bottom: 0;
          width: 2px;
          height: auto;
        }
      }
    }
  }

  /* --- Sizes --- */

  &.sm {
    & .ui-step-indicator {
      width: 1.5rem;
      height: 1.5rem;
      font-size: 0.6875rem;

      & .ui-icon {
        font-size: 0.875rem;
      }
    }

    & .ui-step-title {
      font-size: 0.8125rem;
    }

    & .ui-step-description {
      font-size: 0.75rem;
    }
  }

  &.lg {
    & .ui-step-indicator {
      width: 2.5rem;
      height: 2.5rem;
      font-size: 0.9375rem;

      & .ui-icon {
        font-size: 1.375rem;
      }
    }

    & .ui-step-title {
      font-size: 1rem;
    }

    & .ui-step-description {
      font-size: 0.875rem;
    }
  }
}

.ui-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  position: relative;
  counter-increment: ui-step;

  & .ui-step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: var(--ui-radius-full);
    background: var(--ui-bg-subtle);
    border: 2px solid var(--ui-border);
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--ui-text-muted);
    flex-shrink: 0;
    z-index: 1;
    transition: background var(--ui-transition), border-color var(--ui-transition),
      color var(--ui-transition);

    & .ui-icon {
      font-size: 1.125rem;
    }

    &:empty::before {
      content: counter(ui-step);
    }
  }

  & .ui-step-content {
    text-align: center;
    margin-top: 0.5rem;
  }

  & .ui-step-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--ui-text);
    line-height: 1.3;
  }

  & .ui-step-description {
    font-size: 0.8125rem;
    color: var(--ui-text-muted);
    line-height: 1.4;
    margin-top: 0.125rem;
  }

  /* Connector line */
  &:not(:last-child)::after {
    content: "";
    position: absolute;
    top: calc(1rem - 1px);
    left: calc(50% + 1rem);
    right: calc(-50% + 1rem);
    height: 2px;
    background: var(--ui-border);
    transition: background var(--ui-transition);
  }

  /* --- States --- */

  &.active {
    & .ui-step-indicator {
      background: var(--ui-primary-light);
      border-color: var(--ui-primary);
      color: var(--ui-primary);
    }
  }

  &.completed {
    & .ui-step-indicator {
      background: var(--ui-primary);
      border-color: var(--ui-primary);
      color: var(--ui-primary-text);
    }

    &::after {
      background: var(--ui-primary);
    }
  }

  &.error {
    & .ui-step-indicator {
      background: var(--ui-danger-light);
      border-color: var(--ui-danger);
      color: var(--ui-danger);
    }

    & .ui-step-title {
      color: var(--ui-danger);
    }
  }
}


/* ============================================
   Code Block — Styled pre/code display
   ============================================ */

.ui-code {
  position: relative;
  font-family: var(--ui-font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  background: var(--ui-bg-subtle);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius);
  overflow: hidden;

  & pre {
    margin: 0;
    padding: 1rem;
    overflow-x: auto;
    white-space: pre;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: var(--ui-text);
  }

  & code {
    font-family: inherit;
    font-size: inherit;
  }

  & .ui-code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--ui-border);
    background: var(--ui-surface);
  }

  & .ui-code-lang {
    font-family: var(--ui-font);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--ui-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
  }

  & .ui-code-filename {
    font-family: var(--ui-font-mono);
    font-size: 0.75rem;
    color: var(--ui-text-muted);
  }

  & .ui-code-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    border: none;
    background: none;
    color: var(--ui-text-muted);
    font-family: var(--ui-font);
    font-size: 0.75rem;
    cursor: pointer;
    border-radius: var(--ui-radius-sm);
    transition: background var(--ui-transition), color var(--ui-transition);

    &:hover {
      background: var(--ui-bg-subtle);
      color: var(--ui-text);
    }

    /* Floating copy button (no header) */
    &.floating {
      position: absolute;
      top: 0.5rem;
      right: 0.5rem;
      opacity: 0;
      transition: opacity var(--ui-transition), background var(--ui-transition),
        color var(--ui-transition);
    }
  }

  &:hover .ui-code-copy.floating {
    opacity: 1;
  }

  /* Line numbers */
  &.line-numbers {
    counter-reset: line;

    & .ui-code-body {
      display: flex;
      min-width: 0;
    }

    & .line-numbers-col {
      display: flex;
      flex-direction: column;
      padding: 1rem 0.75rem 1rem 1rem;
      text-align: right;
      color: var(--ui-text-muted);
      opacity: 0.5;
      user-select: none;
      border-right: 1px solid var(--ui-border);
      background: var(--ui-surface);

      & span {
        counter-increment: line;

        &::before {
          content: counter(line);
        }
      }
    }

    & pre {
      min-width: 0;
      flex: 1;
    }
  }

  /* --- Sizes --- */

  &.sm {
    font-size: 0.75rem;

    & pre {
      padding: 0.75rem;
    }
  }

  &.lg {
    font-size: 0.875rem;

    & pre {
      padding: 1.25rem;
    }
  }

  /* --- Borderless variant --- */

  &.borderless {
    border: none;
  }
}

/* Inline code */
.ui-code-inline {
  display: inline;
  padding: 0.125rem 0.375rem;
  font-family: var(--ui-font-mono);
  font-size: 0.8125em;
  color: var(--ui-text);
  background: var(--ui-bg-subtle);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-sm);
}


/* ============================================
   Diff — Code comparison display
   ============================================ */

.ui-diff {
  font-family: var(--ui-font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius);
  overflow: hidden;

  & .ui-diff-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: var(--ui-bg-subtle);
    border-bottom: 1px solid var(--ui-border);
    font-family: var(--ui-font);
    font-size: 0.8125rem;
    color: var(--ui-text-muted);
  }

  & .ui-diff-filename {
    font-weight: 600;
    color: var(--ui-text);
  }

  & .ui-diff-stats {
    display: flex;
    gap: 0.5rem;
    font-size: 0.75rem;

    & .additions {
      color: var(--ui-success);
    }

    & .deletions {
      color: var(--ui-danger);
    }
  }

  & table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
  }

  & .ui-diff-line {
    &.added {
      background: color-mix(in srgb, var(--ui-success) 10%, var(--ui-bg));

      & .ui-diff-content {
        color: var(--ui-text);
      }
    }

    &.removed {
      background: color-mix(in srgb, var(--ui-danger) 10%, var(--ui-bg));

      & .ui-diff-content {
        color: var(--ui-text);
      }
    }

    &.context {
      background: var(--ui-bg);
    }

    &.hunk-header {
      background: color-mix(in srgb, var(--ui-primary) 8%, var(--ui-bg));

      & .ui-diff-content {
        color: var(--ui-primary);
        font-style: italic;
      }
    }
  }

  & .ui-diff-gutter {
    width: 3.5rem;
    padding: 0 0.5rem;
    text-align: right;
    color: var(--ui-text-muted);
    opacity: 0.6;
    user-select: none;
    vertical-align: top;
    font-size: inherit;
    border-right: 1px solid var(--ui-border);
  }

  & .ui-diff-marker {
    width: 1.25rem;
    padding: 0 0.25rem;
    text-align: center;
    color: var(--ui-text-muted);
    user-select: none;
    vertical-align: top;
    font-size: inherit;

    .added & {
      color: var(--ui-success);
    }

    .removed & {
      color: var(--ui-danger);
    }
  }

  & .ui-diff-content {
    padding: 0 1rem;
    white-space: pre;
    overflow-x: auto;
    vertical-align: top;
    font-size: inherit;
    color: var(--ui-text);
  }

  /* --- Inline highlight for changed words --- */

  & .ui-diff-highlight {
    border-radius: 2px;

    .added & {
      background: color-mix(in srgb, var(--ui-success) 25%, transparent);
    }

    .removed & {
      background: color-mix(in srgb, var(--ui-danger) 25%, transparent);
    }
  }

  /* --- Side-by-side mode --- */

  &.side-by-side {
    & .ui-diff-left,
    & .ui-diff-right {
      width: 50%;
      vertical-align: top;
    }

    & .ui-diff-divider {
      width: 1px;
      background: var(--ui-border);
    }
  }

  /* --- Sizes --- */

  &.sm {
    font-size: 0.75rem;
    line-height: 1.5;
  }

  &.lg {
    font-size: 0.875rem;
    line-height: 1.7;
  }
}


/* ============================================
   Popover — Floating content anchored to trigger
   ============================================ */

.ui-popover {
  position: relative;
  display: inline-flex;

  & .ui-popover-content {
    position: absolute;
    bottom: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    min-width: 12rem;
    max-width: 20rem;
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius-lg);
    box-shadow: var(--ui-shadow-lg);
    padding: 0.75rem 1rem;
    font-family: var(--ui-font);
    font-size: var(--ui-font-size);
    color: var(--ui-text);
    line-height: var(--ui-line-height);
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--ui-transition), transform var(--ui-transition),
      visibility var(--ui-transition);
  }

  &.open .ui-popover-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }

  /* --- Positions --- */

  &.bottom .ui-popover-content {
    bottom: auto;
    top: calc(100% + 0.5rem);
    transform: translateX(-50%) translateY(-4px);
  }

  &.bottom.open .ui-popover-content {
    transform: translateX(-50%) translateY(0);
  }

  &.left .ui-popover-content {
    bottom: auto;
    top: 50%;
    left: auto;
    right: calc(100% + 0.5rem);
    transform: translateY(-50%) translateX(4px);
  }

  &.left.open .ui-popover-content {
    transform: translateY(-50%) translateX(0);
  }

  &.right .ui-popover-content {
    bottom: auto;
    top: 50%;
    left: calc(100% + 0.5rem);
    transform: translateY(-50%) translateX(-4px);
  }

  &.right.open .ui-popover-content {
    transform: translateY(-50%) translateX(0);
  }

  /* --- Parts --- */

  & .ui-popover-title {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--ui-text);
    margin: 0 0 0.25rem;
  }

  & .ui-popover-text {
    font-size: var(--ui-font-size);
    color: var(--ui-text-muted);
    margin: 0;
  }

  & .ui-popover-close {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    background: none;
    border: none;
    border-radius: var(--ui-radius-sm);
    color: var(--ui-text-muted);
    cursor: pointer;
    font-size: 0.875rem;
    transition: background var(--ui-transition), color var(--ui-transition);

    &:hover {
      background: var(--ui-bg-subtle);
      color: var(--ui-text);
    }
  }

  /* --- Sizes --- */

  &.sm .ui-popover-content {
    min-width: 8rem;
    max-width: 14rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
  }

  &.lg .ui-popover-content {
    min-width: 16rem;
    max-width: 28rem;
    padding: 1rem 1.25rem;
  }
}


/* ============================================
   Empty State — Zero-data placeholder
   ============================================ */

.ui-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 2rem;
  font-family: var(--ui-font);

  & .ui-empty-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: var(--ui-radius-full);
    background: var(--ui-bg-subtle);
    color: var(--ui-text-muted);
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  & .ui-empty-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ui-text);
    margin: 0 0 0.25rem;
  }

  & .ui-empty-description {
    font-size: var(--ui-font-size);
    color: var(--ui-text-muted);
    line-height: var(--ui-line-height);
    max-width: 24rem;
    margin: 0 0 1rem;
  }

  & .ui-empty-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.25rem;
  }

  & .ui-empty-img {
    max-width: 10rem;
    height: auto;
    margin-bottom: 1rem;
    opacity: 0.8;
  }

  /* --- Sizes --- */

  &.sm {
    padding: 2rem 1.5rem;

    & .ui-empty-icon {
      width: 2.5rem;
      height: 2.5rem;
      font-size: 1.125rem;
      margin-bottom: 0.75rem;
    }

    & .ui-empty-title {
      font-size: 0.875rem;
    }

    & .ui-empty-description {
      font-size: 0.8125rem;
    }
  }

  &.lg {
    padding: 4rem 2rem;

    & .ui-empty-icon {
      width: 4.5rem;
      height: 4.5rem;
      font-size: 2rem;
      margin-bottom: 1.25rem;
    }

    & .ui-empty-title {
      font-size: 1.25rem;
    }

    & .ui-empty-description {
      font-size: 1rem;
    }
  }

  /* --- Bordered variant --- */

  &.bordered {
    border: 2px dashed var(--ui-border);
    border-radius: var(--ui-radius-lg);
  }
}


/* ============================================
   Chat Bubble — Message bubble component
   ============================================ */

.ui-chat {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
}

.ui-chat-message {
  display: flex;
  gap: 0.5rem;
  max-width: 80%;
  align-items: flex-end;

  & .ui-chat-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: var(--ui-radius-full);
    object-fit: cover;
    flex-shrink: 0;

    &[data-initial] {
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--ui-primary);
      color: var(--ui-primary-text);
      font-weight: 600;
      font-size: 0.8125rem;
      font-family: var(--ui-font);

      &::before {
        content: attr(data-initial);
      }
    }
  }

  & .ui-chat-bubble {
    padding: 0.5rem 0.75rem;
    border-radius: var(--ui-radius-lg);
    background: var(--ui-bg-subtle);
    color: var(--ui-text);
    line-height: var(--ui-line-height);
    word-break: break-word;
    border-bottom-left-radius: var(--ui-radius-sm);
  }

  & .ui-chat-meta {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    margin-top: 0.125rem;
    padding: 0 0.25rem;
  }

  & .ui-chat-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--ui-text);
  }

  & .ui-chat-time {
    font-size: 0.6875rem;
    color: var(--ui-text-muted);
  }

  & .ui-chat-status {
    font-size: 0.625rem;
    color: var(--ui-text-muted);
  }

  & .ui-chat-group {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    min-width: 0;
  }

  /* --- Sent messages (right-aligned) --- */

  &.sent {
    align-self: flex-end;
    width: fit-content;

    & .ui-chat-bubble {
      background: var(--ui-primary);
      color: var(--ui-primary-text);
      border-bottom-left-radius: var(--ui-radius-lg);
      border-bottom-right-radius: var(--ui-radius-sm);
    }

    & .ui-chat-meta {
      justify-content: flex-end;
    }
  }

  /* --- Typing indicator --- */

  &.typing .ui-chat-bubble {
    padding: 0.625rem 0.875rem;

    &::before {
      content: "";
      display: block;
      width: 1.625rem;
      height: 0.375rem;
      background:
        radial-gradient(circle at 0.1875rem 0.1875rem, var(--ui-text-muted) 0.1875rem, transparent 0.1875rem),
        radial-gradient(circle at 0.8125rem 0.1875rem, var(--ui-text-muted) 0.1875rem, transparent 0.1875rem),
        radial-gradient(circle at 1.4375rem 0.1875rem, var(--ui-text-muted) 0.1875rem, transparent 0.1875rem);
      animation: ui-chat-typing 1.2s ease infinite;
    }
  }

  /* --- Sizes --- */

  &.sm {
    & .ui-chat-avatar {
      width: 1.5rem;
      height: 1.5rem;
    }

    & .ui-chat-bubble {
      padding: 0.375rem 0.625rem;
      font-size: 0.8125rem;
    }
  }

  &.lg {
    & .ui-chat-avatar {
      width: 2.5rem;
      height: 2.5rem;
    }

    & .ui-chat-bubble {
      padding: 0.625rem 1rem;
      font-size: 1rem;
    }
  }
}

@keyframes ui-chat-typing {
  0%,
  60%,
  100% {
    opacity: 0.3;
  }
  30% {
    opacity: 1;
  }
}

/* ============================================
   Menu — Vertical navigation sidebar
   ============================================ */

.ui-menu {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  min-width: 0;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  padding: 0.5rem;
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg);

  /* --- Borderless variant --- */

  &.borderless {
    border: none;
    background: none;
    border-radius: 0;
    padding: 0;
  }
}

.ui-menu-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4375rem 0.75rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  color: var(--ui-text);
  background: none;
  border: none;
  border-radius: var(--ui-radius-sm);
  cursor: pointer;
  text-decoration: none;
  text-align: left;
  width: 100%;
  white-space: nowrap;
  transition: background var(--ui-transition), color var(--ui-transition);

  & .ui-icon {
    font-size: 1.125rem;
    color: var(--ui-text-muted);
    flex-shrink: 0;
    transition: color var(--ui-transition);
  }

  & .ui-menu-badge {
    margin-left: auto;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--ui-text-muted);
    min-width: 1.25rem;
    text-align: center;
  }

  &:hover {
    background: var(--ui-bg-subtle);

    & .ui-icon {
      color: var(--ui-text);
    }
  }

  &.active {
    background: var(--ui-primary-light);
    color: var(--ui-primary);
    font-weight: 500;

    & .ui-icon {
      color: var(--ui-primary);
    }

    & .ui-menu-badge {
      color: var(--ui-primary);
    }
  }

  &:disabled,
  &[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
  }

  /* --- Danger item --- */

  &.danger {
    color: var(--ui-danger);

    & .ui-icon {
      color: var(--ui-danger);
    }

    &:hover {
      background: color-mix(in srgb, var(--ui-danger) 8%, transparent);
    }
  }
}

.ui-menu-label {
  display: block;
  padding: 0.625rem 0.75rem 0.25rem;
  font-family: var(--ui-font);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ui-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ui-menu-divider {
  height: 0;
  border: none;
  border-top: 1px solid var(--ui-border);
  margin: 0.375rem 0;
}

/* Collapsible group */
.ui-menu-group {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;

  & .ui-menu-group-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4375rem 0.75rem;
    font-family: var(--ui-font);
    font-size: var(--ui-font-size);
    font-weight: 500;
    color: var(--ui-text);
    background: none;
    border: none;
    border-radius: var(--ui-radius-sm);
    cursor: pointer;
    text-align: left;
    width: 100%;
    white-space: nowrap;
    transition: background var(--ui-transition);

    &::after {
      content: "";
      display: block;
      margin-left: auto;
      width: 1rem;
      height: 1rem;
      background: currentColor;
      mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
      mask-size: contain;
      mask-repeat: no-repeat;
      opacity: 0.4;
      transition: transform var(--ui-transition);
      flex-shrink: 0;
    }

    &:hover {
      background: var(--ui-bg-subtle);
    }
  }

  & .ui-menu-group-items {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    padding-left: 0.75rem;
  }

  &.collapsed {
    & .ui-menu-group-toggle::after {
      transform: rotate(-90deg);
    }

    & .ui-menu-group-items {
      display: none;
    }
  }
}

/* --- Sizes --- */

.ui-menu.sm {
  padding: 0.375rem;
  font-size: 0.8125rem;

  & .ui-menu-item {
    padding: 0.3125rem 0.625rem;
    font-size: 0.8125rem;

    & .ui-icon {
      font-size: 1rem;
    }
  }

  & .ui-menu-label {
    padding: 0.5rem 0.625rem 0.1875rem;
    font-size: 0.625rem;
  }

  & .ui-menu-group .ui-menu-group-toggle {
    padding: 0.3125rem 0.625rem;
    font-size: 0.8125rem;
  }
}

.ui-menu.lg {
  padding: 0.625rem;

  & .ui-menu-item {
    padding: 0.5625rem 0.875rem;
    font-size: 0.9375rem;

    & .ui-icon {
      font-size: 1.25rem;
    }
  }

  & .ui-menu-label {
    padding: 0.75rem 0.875rem 0.3125rem;
    font-size: 0.75rem;
  }

  & .ui-menu-group .ui-menu-group-toggle {
    padding: 0.5625rem 0.875rem;
    font-size: 0.9375rem;
  }
}


/* ============================================
   Gradient mode — toggled via data-ui-gradient
   ============================================ */

[data-ui-gradient] {

  /* --- Timeline (solid) --- */

  & .ui-timeline-item .ui-timeline-dot.solid {
    background: linear-gradient(315deg, var(--ui-primary), var(--ui-primary-hover));

    &.success {
      background: linear-gradient(315deg, var(--ui-success), var(--ui-success-hover));
    }

    &.danger {
      background: linear-gradient(315deg, var(--ui-danger), var(--ui-danger-hover));
    }

    &.warning {
      background: linear-gradient(315deg, var(--ui-warning), var(--ui-warning-hover));
    }
  }

  /* --- Stepper --- */

  & .ui-step.completed {
    & .ui-step-indicator {
      background: linear-gradient(315deg, var(--ui-primary), var(--ui-primary-hover));
    }

    &::after {
      background: linear-gradient(90deg, var(--ui-primary), var(--ui-primary-hover));
    }
  }

  /* --- Chat --- */

  & .ui-chat-avatar[data-initial] {
    background: linear-gradient(315deg, var(--ui-primary), var(--ui-primary-hover));
  }

  & .ui-chat-message.sent .ui-chat-bubble {
    background: linear-gradient(315deg, var(--ui-primary), var(--ui-primary-hover));
  }
}