/* ========================================
   展览页面专用样式
   ======================================== */

/* 展览筛选器 */
.exhibitions-filters {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 80px;
    z-index: 100;
}

/* 展览分类按钮（与 gallery 统一，避免分隔/间距异常） */
.exhibitions-filters .filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.exhibitions-filters .filter-btn {
    padding: 0.625rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 0;
}

.exhibitions-filters .filter-btn:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.exhibitions-filters .filter-btn.active {
    background-color: var(--color-primary);
    color: white;
}

/* 展览区域 */
.exhibitions-section {
    padding: var(--spacing-3xl) 0;
}

/* 时间线 */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.timeline-item:nth-child(odd) {
    padding-right: calc(50% + var(--spacing-xl));
}

.timeline-item:nth-child(even) {
    padding-left: calc(50% + var(--spacing-xl));
}

.timeline-dot {
    position: absolute;
    top: 30px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 4px solid var(--color-bg);
    box-shadow: 0 0 0 4px var(--color-primary-light);
    z-index: 2;
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: calc(50% - 8px);
}

.timeline-item:nth-child(even) .timeline-dot {
    left: calc(50% - 8px);
}

.timeline-card {
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    cursor: pointer;
}

.timeline-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.timeline-image {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.timeline-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.timeline-card:hover .timeline-image img {
    transform: scale(1.05);
}

.exhibition-status {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.8125rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.status-upcoming {
    background-color: rgba(102, 126, 234, 0.9);
    color: white;
}

.status-ongoing {
    background-color: rgba(46, 213, 115, 0.9);
    color: white;
}

.status-past {
    background-color: rgba(149, 149, 149, 0.9);
    color: white;
}

.timeline-content {
    padding: var(--spacing-lg);
}

.exhibition-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.exhibition-date svg {
    width: 16px;
    height: 16px;
}

.exhibition-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.exhibition-location {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.exhibition-location svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.exhibition-description {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .exhibitions-filters {
        top: 70px;
    }

    .exhibitions-filters .filter-buttons {
        justify-content: flex-start;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .exhibitions-filters .filter-buttons::-webkit-scrollbar {
        display: none;
    }

    .exhibitions-filters .filter-btn {
        white-space: nowrap;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 60px !important;
        padding-right: 0 !important;
    }

    .timeline-dot {
        left: 12px !important;
        right: auto !important;
    }
}