/*
 * Timeline — Activity feed with a continuous vertical line and hollow dots.
 * Reusable across any entity (journal entries, accounts, tenants).
 * Adopted from the financess design system, adapted for Finances_app tokens.
 *
 * Structure:
 *   .timeline-card            (wrapper)
 *     .timeline-header        (title)
 *     .timeline
 *       .timeline__feed       (the event stream)
 *         .timeline__group    (date-grouped section)
 *           .timeline__date-label
 *           .timeline__item   (individual event)
 */

@layer components {

  /* --- Header --- */

  .timeline-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem 0.5rem;
  }

  .timeline-header__title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-heading);
    margin: 0;
  }


  /* --- Filter --- */

  .timeline-filter {
    display: flex;
    gap: 0.75rem;
  }

  .timeline-filter__option {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    color: var(--color-text-body);
    cursor: pointer;
    user-select: none;
  }

  /* Hide items and empty-after-filter date groups. Using :has() keeps the
     layout free of stale date labels when every item in a group is filtered
     out. */
  .timeline--hide-messages [data-timeline-item-type="message"],
  .timeline--hide-activity [data-timeline-item-type="activity"] {
    display: none;
  }

  .timeline--hide-messages .timeline__group:not(:has([data-timeline-item-type="activity"])),
  .timeline--hide-activity .timeline__group:not(:has([data-timeline-item-type="message"])) {
    display: none;
  }

  .timeline--hide-messages.timeline--hide-activity .timeline__group {
    display: none;
  }


  /* --- Feed --- */

  .timeline__feed {
    position: relative;
    padding: 0.5rem 1.25rem 1rem;
  }

  /* Continuous vertical line */
  .timeline__feed::before {
    content: "";
    position: absolute;
    inset-inline-start: calc(1.25rem + 0.625rem);
    inset-block: 1rem 1.5rem;
    inline-size: 1px;
    background: var(--color-border);
  }


  /* --- Date group --- */

  .timeline__group {
    padding-block-start: 0.75rem;
  }

  .timeline__group:first-child {
    padding-block-start: 0.5rem;
  }


  /* --- Date label --- */

  .timeline__date-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-body);
    padding-block-end: 0.5rem;
    margin-inline-start: calc(1.25rem + 0.75rem);
  }


  /* --- Timeline item --- */

  .timeline__item {
    display: grid;
    grid-template-columns: 1.25rem 1fr auto;
    column-gap: 0.75rem;
    padding-block: 0.5rem;
  }


  /* --- Marker: hollow dot --- */

  .timeline__marker {
    grid-column: 1;
    grid-row: 1 / -1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
  }

  .timeline__dot {
    position: relative;
    z-index: 1;
    inline-size: 0.5625rem;
    block-size: 0.5625rem;
    border-radius: 50%;
    border: 1.5px solid var(--color-border);
    background: var(--color-white);
    flex-shrink: 0;
    margin-block-start: 0.3125rem;
  }


  /* --- Content --- */

  .timeline__content {
    grid-column: 2;
    font-size: 0.8125rem;
    color: var(--color-text-body);
    line-height: 1.5;
  }

  .timeline__content strong {
    color: var(--color-text-heading);
    font-weight: 500;
  }


  /* --- Detail line --- */

  .timeline__detail {
    font-size: 0.75rem;
    color: var(--color-text-body);
    opacity: 0.7;
    margin-block-start: 0.25rem;
  }

  .timeline__change-from {
    text-decoration: line-through;
    opacity: 0.7;
  }

  .timeline__change-to {
    font-weight: 500;
  }


  /* --- Timestamp --- */

  .timeline__time {
    grid-column: 3;
    font-size: 0.75rem;
    color: var(--color-text-body);
    opacity: 0.7;
    white-space: nowrap;
    padding-block-start: 0.125rem;
  }


  /* --- Empty state --- */

  .timeline__empty {
    padding: 1.5rem 1.25rem;
    text-align: center;
    color: var(--color-text-body);
    opacity: 0.6;
    font-size: 0.8125rem;
  }


  /* --- Reasoning block (agent-authored events) --- */

  .timeline__reasoning {
    margin-block-start: 0.25rem;
  }

  .timeline__reasoning-toggle {
    font-size: 0.75rem;
    color: var(--color-text-body);
    opacity: 0.7;
    cursor: pointer;
  }

  .timeline__reasoning-toggle:hover {
    opacity: 1;
  }

  .timeline__reasoning-body {
    margin-block-start: 0.5rem;
    padding: 0.75rem;
    background: oklch(from var(--color-border) 0.985 c h);
    border-radius: 0.375rem;
    font-size: 0.8125rem;
    color: var(--color-text-heading);
    line-height: 1.5;
  }

  .timeline__reasoning-body p {
    margin: 0;
  }

  .timeline__reasoning-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-block-start: 0.5rem;
    font-size: 0.75rem;
    color: var(--color-text-body);
    opacity: 0.7;
  }


  /* --- Composer (message input) --- */

  .timeline-composer {
    padding: 1rem 1.25rem;
    border-block-end: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .timeline-composer__field {
    position: relative;
  }

  .timeline-composer__body {
    width: 100%;
    padding: 0.5rem 0.625rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    font: inherit;
    color: var(--color-text-heading);
    background: var(--color-white);
    resize: vertical;
  }

  .timeline-composer__body:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
  }

  .timeline-composer__actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
  }

  .timeline-composer__buttons {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }

  .timeline-composer__hint {
    font-size: 0.75rem;
    color: var(--color-text-body);
    opacity: 0.7;
  }

  .timeline-composer__suggestions {
    position: absolute;
    inset-inline-start: 0;
    inset-block-start: 100%;
    margin-block-start: 0.25rem;
    min-width: 16rem;
    max-height: 14rem;
    overflow-y: auto;
    padding: 0.25rem 0;
    list-style: none;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    box-shadow: 0 4px 12px oklch(from var(--color-border) 0.2 c h / 0.08);
    z-index: 10;
  }

  .timeline-composer__suggestions[hidden] {
    display: none;
  }

  .timeline-composer__suggestion {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.375rem 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
  }

  .timeline-composer__suggestion--active,
  .timeline-composer__suggestion:hover {
    background: oklch(from var(--color-border) 0.97 c h);
  }

  .timeline-composer__suggestion-token {
    font-size: 0.75rem;
    color: var(--color-text-body);
    opacity: 0.7;
  }
}