/* Activity Panel — always visible */
#inboxActivityPanel {
    width: 380px;
    flex-shrink: 0;
    border-left: 1px solid var(--border-light);
    background: var(--bg-card);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.activity-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6) var(--space-2);
}

.activity-panel-title {
    font-size: var(--font-size-md);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin: 0;
}

.activity-mark-all-read {
    height: 28px;
    padding: 0 8px;
    gap: 4px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    font-size: var(--font-size-12);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.activity-mark-all-read:hover {
    background: var(--bg-secondary);
    color: var(--accent-blue);
}

/* Segmented control tabs */
.activity-tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-md);
    padding: 2px;
    margin: 0 24px;
    gap: 2px;
}

.activity-tab {
    flex: 1;
    padding: 8px 12px;
    min-height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.activity-tab:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
}

.activity-tab:focus-visible {
    outline: var(--focus-outline);
    outline-offset: var(--focus-outline-offset-inset);
}

.activity-tab.active {
    background: rgba(0, 0, 0, 0.06);
    color: var(--text-primary);
    font-weight: 600;
}

[data-theme="dark"] .activity-tab.active {
    background: rgba(255, 255, 255, 0.1);
}

/* Activity list area */
.activity-panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

/* Activity item card */
.activity-item {
    display: flex;
    gap: 12px;
    padding: 10px 12px;
    position: relative;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: background var(--duration-fast) var(--ease-in-out);
}

.activity-item:hover {
    background: rgba(74, 144, 217, 0.04);
}

.activity-item:focus-visible {
    outline: var(--focus-outline);
    outline-offset: var(--focus-outline-offset-inset);
}

.activity-item-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-circle);
    background: var(--accent-fill);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-12);
    font-weight: 600;
    flex-shrink: 0;
}

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

.activity-item-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

/* An update's headline is a task's or note's name (an entry is headed by what it is about): two lines at most, a
   long word broken — and its "+N more" beside it, outside the clamp, where it is never cut off (and focusing it
   never scrolls the clipped name to the end) */
.activity-item-headline { display: flex; align-items: baseline; gap: 6px; }
.activity-item-title {
    min-width: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    overflow-wrap: anywhere;
}
.activity-item-headline .activity-grouped-badge { flex-shrink: 0; margin-left: 0; }

.activity-item-message {
    font-size: var(--font-size-12);
    color: var(--text-tertiary);
    margin-top: 2px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.activity-item.expanded .activity-item-message {
    -webkit-line-clamp: unset;
    display: block;
}

.activity-item-time {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Unread item highlight with left-edge bar */
.activity-item.unread {
    background: rgba(74, 144, 217, 0.06);
}

.activity-item.unread::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: var(--accent-blue, #4A90D9);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Empty state */
.activity-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
    color: var(--text-tertiary);
}

.activity-empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.activity-empty-state p {
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Activity group headers */
.activity-group-header {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    padding: 16px 0 6px;
}

.activity-group-header:first-child {
    padding-top: 0;
}

/* P4: forward section ("Where you left off" + AI tips) */
.activity-forward { display: flex; flex-direction: column; gap: 8px; }

.activity-forward-card {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.activity-forward-icon {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
    margin-top: 1px;
}
.activity-forward-icon svg { width: 18px; height: 18px; }
.activity-forward-icon.activity-icon-insight { color: var(--accent-blue); }

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

.activity-forward-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.activity-forward-meta {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: 2px;
}

.activity-forward-tip-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.45;
}

.activity-forward-link {
    margin-top: 6px;
    padding: 0;
    background: none;
    border: none;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-blue);
    cursor: pointer;
}
.activity-forward-link:hover { text-decoration: underline; }

.activity-forward-dismiss {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    line-height: 1;
    padding: 0;
    background: none;
    border: none;
    font-size: var(--font-size-16);
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: var(--radius-sm);
}
.activity-forward-dismiss:hover { color: var(--text-primary); }
.activity-forward-dismiss:focus-visible {
    outline: var(--focus-outline);
    outline-offset: var(--focus-outline-offset);
}

.activity-forward-divider {
    height: 1px;
    background: var(--border-light);
    margin: 4px 0 8px;
}

/* Activity meta row */
.activity-item-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
}

.activity-item-entity {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Grouped notification badge (clickable) */
.activity-grouped-badge {
    display: inline-block;
    height: 18px;
    padding: 0 6px;
    font-size: var(--font-size-2xs);
    font-weight: 600;
    font-family: var(--font-family);
    color: var(--accent-blue);
    background: rgba(74, 144, 217, 0.1);
    border: none;
    border-radius: var(--radius-md);
    text-align: center;
    line-height: 18px;
    margin-left: 6px;
    vertical-align: middle;
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-in-out);
}

.activity-grouped-badge:hover {
    background: rgba(74, 144, 217, 0.18);
}

.activity-grouped-badge.expanded {
    background: rgba(74, 144, 217, 0.18);
}

/* Grouped items expand container */
.activity-grouped-items {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-normal) var(--ease-in-out), margin-top var(--duration-normal) var(--ease-in-out);
    margin-top: 0;
}

.activity-grouped-items.expanded {
    max-height: 2000px;
    margin-top: 8px;
}

.activity-grouped-sub-item {
    padding: 6px 0;
    border-top: 1px solid var(--border-light);
    cursor: pointer;
    display: flex;
    align-items: baseline;
    gap: 8px;
    transition: background var(--duration-fast) var(--ease-in-out);
    border-radius: var(--radius-sm);
}

.activity-grouped-sub-item:hover {
    background: rgba(74, 144, 217, 0.04);
}

.activity-grouped-sub-body {
    font-size: var(--font-size-12);
    color: var(--text-secondary);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.activity-grouped-sub-time {
    font-size: var(--font-size-2xs);
    color: var(--text-tertiary);
    flex-shrink: 0;
}