/* =====================================
   LAYOUT - Apple-Inspired Structure & Components
   ===================================== */

/* Global Background with Cool Shimmer Effect */
body {
    background: linear-gradient(135deg, #f5f5f7 0%, #fafafa 25%, #f0f0f2 50%, #f5f5f7 75%, #fafafa 100%);
 
}

body::before {
}

/* Page Header */
.frise-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--spacing-3xl) 0;
    margin-bottom: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
    font-family: var(--font-family);
}

.frise-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0.3;
}

.frise-header .container-fluid {
    position: relative;
    z-index: 1;
}

.frise-header h2 {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    letter-spacing: -0.02em;
}

.frise-header h2 i {
    font-size: 2rem;
    opacity: 0.9;
}

.frise-header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: var(--font-weight-light);
    letter-spacing: -0.01em;
}

/* Event Counter Badge */
.event-counter {
    background: var(--accent);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-family);
    letter-spacing: -0.01em;
}

.event-counter i {
    font-size: 1.1rem;
}

/* Main Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 3fr 9fr;
    gap: var(--spacing-2xl);
    max-width: 1600px;
    margin: 0 auto;
}

/* Filters Sidebar */
.filters-sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-x: visible;
    max-height: 100vh;
    padding-left:30px;
}

/* Timeline Content Area - Main container */
.content-grid > div:last-child {
    background: transparent;
    border: none;
    box-shadow: none;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-2xl);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--gray-300);
    margin: var(--spacing-2xl) 0;
    font-family: var(--font-family);
}

.empty-state i {
    font-size: 4rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-lg);
    opacity: 0.7;
}

.empty-state h3 {
    color: var(--gray-800);
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.empty-state p {
    color: var(--gray-600);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.6;
    font-weight: var(--font-weight-regular);
}

.empty-state .btn {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-2xl);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition-normal);
    font-family: var(--font-family);
}

.empty-state .btn i {
    color: var(--white) !important;
    font-size: 0.8rem !important;
    margin-right: var(--spacing-sm);
}

.empty-state .btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    background: var(--primary-dark);
}

.empty-state .btn:hover i {
    color: var(--white) !important;
}

/* Loading States */
.loading-skeleton {
    animation: skeleton-loading 1.5s ease-in-out infinite alternate;
}

@keyframes skeleton-loading {
    0% {
        opacity: 0.7;
    }
    100% {
        opacity: 1;
    }
}

.timeline-skeleton {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.timeline-skeleton-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.timeline-skeleton-date {
    width: 80px;
    height: 80px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
}

.timeline-skeleton-content {
    flex: 1;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
}

.timeline-skeleton-title {
    width: 70%;
    height: 1.5rem;
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.timeline-skeleton-text {
    width: 100%;
    height: 1rem;
    background: var(--gray-200);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
}

.timeline-skeleton-text:last-child {
    width: 80%;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .content-grid {
        grid-template-columns: 280px 1fr;
        gap: 0px;
    }
}

@media (max-width: 992px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .frise-header h2 {
        font-size: 2rem;
    }
    
    .frise-header h2 i {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .frise-header {
        padding: var(--spacing-lg) 0;
    }
    
    .frise-header h2 {
        font-size: 1.75rem;
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .frise-header .subtitle {
        font-size: 1rem;
        text-align: center;
    }
    
    .content-grid {
        gap: var(--spacing-md);
    }
    
    .filters-sidebar {
        height: auto;
        position:relative;
        margin-top:20px;
        padding-left:10px;
        padding-right:10px;
    }
    
    .event-counter {
        font-size: 0.9rem;
        padding: var(--spacing-xs) var(--spacing-lg);
    }
    
    .empty-state {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .empty-state i {
        font-size: 3rem;
    }
    
    .empty-state h3 {
        font-size: 1.25rem;
    }
    
    .empty-state p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .frise-header {
        padding: var(--spacing-md) 0;
    }
    
    .frise-header h2 {
        font-size: 1.5rem;
    }
    
    .empty-state {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .empty-state .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.9rem;
    }
}

/* Print Styles */
@media print {
    .filter-section,
    .period-filter-section,
    .event-counter {
        display: none;
    }
    
    .timeline-item {
        break-inside: avoid;
        margin-bottom: var(--spacing-lg);
    }
    
    .timeline-content {
        box-shadow: none;
        border: 1px solid var(--gray-400);
    }
    
    .event-images {
        display: none;
    }
    
    .frise-header {
        background: var(--gray-800) !important;
        -webkit-print-color-adjust: exact;
        color-adjust: exact;
    }
}