/**
 * Status Timeline component - Modern vertical timeline for displaying
 * status transition history across entities (Batches, Service Orders,
 * Incoming Shipments, Leak Reports, Projects, etc.).
 *
 * FEATURES:
 * - Vertical timeline with connecting line and colored markers
 * - Status transition badges with arrow indicator
 * - Current status highlight with pulse animation
 * - Subtle hover animations consistent with metric cards
 * - Fully accessible (ARIA labels, keyboard navigation, screen reader support)
 * - Responsive design for mobile, tablet, and desktop
 * - Reduced motion and high contrast mode support
 * - Print-friendly styles
 *
 * BEM Naming: .status-timeline, .status-timeline__item, .status-timeline__marker, etc.
 *
 * @author PBW Web Architects, LLC
 * @license Copyright © PBW Web Architects, LLC
 */

/* ============================================
   Base Container
   ============================================ */

.status-timeline {
    background: var(--color-white);
    border: 1px solid var(--card-border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

.status-timeline:hover {
    box-shadow: var(--shadow-md);
}

/* ============================================
   Header
   ============================================ */

.status-timeline__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-gray-200);
    background: var(--color-gray-100);
}

.status-timeline__header-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, rgba(37, 71, 106, 0.85) 100%);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.status-timeline__title {
    margin: 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-dark);
    line-height: var(--line-height-snug);
}

/* ============================================
   Timeline List
   ============================================ */

.status-timeline__list {
    list-style: none;
    margin: 0;
    padding: var(--space-4) var(--space-5);
}

/* ============================================
   Timeline Item
   ============================================ */

.status-timeline__item {
    display: flex;
    gap: var(--space-4);
    position: relative;
    padding-bottom: var(--space-4);
    transition: background-color var(--transition-fast);
}

.status-timeline__item--last {
    padding-bottom: 0;
}

.status-timeline__item:hover .status-timeline__content {
    background: var(--color-gray-100);
}

/* ============================================
   Connector (Marker + Line)
   ============================================ */

.status-timeline__connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
    width: 20px;
    padding-top: var(--space-1);
}

.status-timeline__marker {
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    position: relative;
    z-index: 1;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.status-timeline__marker--current {
    background: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-primary-light), var(--shadow-sm);
}

.status-timeline__marker--current::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-primary);
    opacity: 0.3;
    animation: timeline-pulse 2s ease-in-out infinite;
}

.status-timeline__marker--past {
    background: var(--color-gray-400);
    box-shadow: 0 0 0 3px var(--color-gray-200);
}

.status-timeline__item:hover .status-timeline__marker {
    transform: scale(1.15);
}

.status-timeline__item:hover .status-timeline__marker--current {
    box-shadow: 0 0 0 5px var(--color-primary-light), var(--shadow-md);
}

.status-timeline__line {
    flex: 1;
    width: 2px;
    background: linear-gradient(180deg, var(--color-gray-300) 0%, var(--color-gray-200) 100%);
    margin-top: var(--space-1);
    min-height: 20px;
}

/* ============================================
   Content
   ============================================ */

.status-timeline__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    min-width: 0;
}

.status-timeline__transition {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.status-timeline__arrow {
    color: var(--color-gray-500);
    font-size: var(--font-size-xs);
    flex-shrink: 0;
}

/* ============================================
   Badges
   ============================================ */

.status-timeline__badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wide);
    line-height: var(--line-height-snug);
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.status-timeline__badge--from {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

.status-timeline__badge--to {
    background: linear-gradient(135deg, var(--color-secondary-light) 0%, rgba(26, 111, 160, 0.15) 100%);
    color: var(--color-secondary);
}

.status-timeline__badge--current {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, rgba(37, 71, 106, 0.15) 100%);
    color: var(--color-primary);
    box-shadow: 0 1px 3px rgba(37, 71, 106, 0.15);
}

.status-timeline__item:hover .status-timeline__badge {
    box-shadow: var(--shadow-xs);
}

/* ============================================
   Timestamp
   ============================================ */

.status-timeline__timestamp {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-base);
}

/* ============================================
   Empty State
   ============================================ */

.status-timeline__empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--space-5);
    text-align: center;
    gap: var(--space-3);
}

.status-timeline__empty-icon {
    font-size: var(--font-size-3xl);
    color: var(--color-gray-400);
}

.status-timeline__empty-message {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    font-weight: var(--font-weight-medium);
}

/* ============================================
   Animations
   ============================================ */

@keyframes timeline-pulse {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.15;
        transform: scale(1.3);
    }
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    .status-timeline__header {
        padding: var(--space-3) var(--space-4);
    }

    .status-timeline__list {
        padding: var(--space-3) var(--space-4);
    }

    .status-timeline__item {
        gap: var(--space-3);
    }

    .status-timeline__content {
        padding: var(--space-1) var(--space-2);
    }

    .status-timeline__badge {
        font-size: 0.65rem;
        padding: 2px var(--space-2);
    }

    .status-timeline__timestamp {
        font-size: 0.65rem;
    }
}

@media (max-width: 576px) {
    .status-timeline__transition {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
    }

    .status-timeline__arrow {
        transform: rotate(90deg);
        margin-left: var(--space-2);
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .status-timeline {
        box-shadow: none;
        border: 1px solid var(--color-gray-300);
        break-inside: avoid;
        page-break-inside: avoid;
    }

    .status-timeline:hover {
        box-shadow: none;
    }

    .status-timeline__marker--current::after {
        display: none;
    }

    .status-timeline__item:hover .status-timeline__content {
        background: transparent;
    }

    .status-timeline__item:hover .status-timeline__marker {
        transform: none;
    }
}

/* ============================================
   Accessibility
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    .status-timeline,
    .status-timeline__marker,
    .status-timeline__badge,
    .status-timeline__content {
        transition: none;
    }

    .status-timeline__marker--current::after {
        animation: none;
    }

    .status-timeline__item:hover .status-timeline__marker {
        transform: none;
    }
}

@media (prefers-contrast: high) {
    .status-timeline {
        border-width: 2px;
    }

    .status-timeline__marker--current {
        outline: 2px solid var(--color-primary-dark);
    }

    .status-timeline__marker--past {
        outline: 2px solid var(--color-gray-700);
    }

    .status-timeline__line {
        width: 3px;
        background: var(--color-gray-600);
    }

    .status-timeline__badge {
        border: 1px solid currentColor;
    }
}