/* ================================================================
   ACTIVITY TIMELINE
   Styles pour le fil d'activité utilisateur
   
   Utilise les CSS variables du design system (variables.css)
   et les composants existants (entity-cell, ui-btn, etc.)
   ================================================================ */

/* ----------------------------------------------------------------
   TIMELINE CONTAINER
   ---------------------------------------------------------------- */

.activity-timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ----------------------------------------------------------------
   ACTIVITY ITEM
   ---------------------------------------------------------------- */

.activity-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    transition: background-color 0.15s ease;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-item:hover {
    background-color: var(--color-primary-tint);
}

/* ----------------------------------------------------------------
   ICÔNE D'ACTION (cercle coloré à gauche)
   ---------------------------------------------------------------- */

.activity-item__icon-wrapper {
    flex-shrink: 0;
}

.activity-item__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.activity-item__icon--publish {
    background-color: var(--color-success-light);
    color: var(--color-success-dark);
}

.activity-item__icon--comment {
    background-color: var(--color-info-light);
    color: var(--color-info-dark);
}

.activity-item__icon--like {
    background-color: rgba(217, 161, 150, 0.15);
    color: var(--color-accent-3);
}

.activity-item__icon--attach {
    background-color: rgba(54, 89, 87, 0.1);
    color: var(--color-primary);
}

.activity-item__icon--follow {
    background-color: rgba(106, 90, 205, 0.12);
    color: #6a5acd;
}

.activity-item__icon--connection {
    background-color: rgba(46, 139, 87, 0.12);
    color: #2e8b57;
}

.activity-item__icon--branch-share {
    background-color: rgba(147, 112, 219, 0.12);
    color: #9370db;
}

/* ----------------------------------------------------------------
   CONTENU
   ---------------------------------------------------------------- */

.activity-item__content {
    flex: 1;
    min-width: 0;
}

.activity-item__header.entity-cell {
    align-items: flex-start;
}

.activity-item__message {
    font-size: var(--font-size-sm);
    color: var(--color-text);
    line-height: 1.45;
    word-break: break-word;
}

.activity-item__excerpt {
    margin-top: var(--spacing-2xs);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-style: italic;
    line-height: 1.4;
}

.activity-item__date {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ----------------------------------------------------------------
   LIEN VERS LE CONTENU (flèche à droite)
   ---------------------------------------------------------------- */

.activity-item__link {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease;
    margin-top: var(--spacing-xs);
}

.activity-item__link:hover {
    background-color: var(--color-primary-tint);
    color: var(--color-primary);
}

/* ----------------------------------------------------------------
   SKELETON LOADING
   ---------------------------------------------------------------- */

.activity-item--skeleton {
    pointer-events: none;
    opacity: 0.7;
}

.activity-item--skeleton .skeleton-block {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    height: 16px;
    width: 80px;
}

.activity-item--skeleton .entity-cell__avatar.skeleton-block {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
}

.activity-item--skeleton .activity-item__icon.skeleton-block {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
}

.activity-item--skeleton .skeleton-line {
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    height: 14px;
    margin-top: var(--spacing-xs);
}

.activity-item--skeleton .skeleton-line:first-child {
    width: 100%;
}

/* ----------------------------------------------------------------
   ÉTAT VIDE
   ---------------------------------------------------------------- */

.activity-timeline:empty::after {
    content: attr(data-empty-message);
    display: block;
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ----------------------------------------------------------------
   RESPONSIVE
   ---------------------------------------------------------------- */

@media (max-width: 640px) {
    .activity-item {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .activity-item__icon {
        width: 28px;
        height: 28px;
        font-size: var(--font-size-xs);
    }

    .activity-item__link {
        width: 28px;
        height: 28px;
    }
}