* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-white: #f1f5f9;
    --text-gray: #94a3b8;
    --border: #334155;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease;
    position: relative;
}

.back-link {
    position: absolute;
    left: 0;
    top: 0;
    color: var(--text-gray);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.back-link:hover {
    color: var(--primary);
}

@media (max-width: 768px) {
    .back-link {
        position: static;
        display: block;
        margin-bottom: 1rem;
    }
}

.header h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.header p {
    color: var(--text-gray);
    font-size: 1.1rem;
}

.loading-container {
    text-align: center;
    padding: 4rem 2rem;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--bg-card);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

.loading-text {
    color: var(--text-gray);
    font-size: 1.1rem;
}

.loading-progress {
    margin-top: 1rem;
    color: var(--primary);
    font-weight: 600;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease;
}

.stat-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
    border-color: var(--primary);
}

.stat-card .icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-card .label {
    color: var(--text-gray);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.filter-bar {
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.filter-group label {
    font-weight: 600;
    color: var(--text-white);
    font-size: 0.875rem;
}

.filter-group select,
.filter-group input {
    padding: 0.625rem 1rem;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-white);
    font-size: 0.875rem;
    transition: all 0.3s ease;
    min-width: 120px;
}

.filter-group select:focus,
.filter-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.filter-group select option {
    background: var(--bg-card);
    color: var(--text-white);
}

.timeline {
    position: relative;
    padding-left: 2rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary) 0%, transparent 100%);
    border-radius: 3px;
}

.timeline-year {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-year-marker {
    position: absolute;
    left: -2.75rem;
    top: 0;
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
}

.timeline-year-header {
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-year-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.timeline-year-header .count {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 0.375rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.month-group {
    margin-bottom: 2rem;
    padding-left: 1.5rem;
}

.month-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-gray);
    font-size: 1.125rem;
    font-weight: 600;
}

.month-header .icon {
    font-size: 1.5rem;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.image-card {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s ease;
    animation: fadeIn 0.5s ease;
}

.image-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--primary);
    z-index: 1;
}

.image-card .wrapper {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.image-card:hover img {
    transform: scale(1.1);
}

.image-card .overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(15, 23, 42, 0.8) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: flex-end;
    padding: 1rem;
}

.image-card:hover .overlay {
    opacity: 1;
}

.image-card .overlay .icon {
    color: white;
    font-size: 1.5rem;
}

.image-card .info {
    padding: 0.75rem;
}

.image-card .filename {
    font-size: 0.75rem;
    color: var(--text-gray);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.image-card .date {
    font-size: 0.625rem;
    color: var(--text-gray);
    opacity: 0.7;
    margin-top: 0.25rem;
}

.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.98);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
    backdrop-filter: blur(10px);
}

.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.lightbox .close {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox .close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg) scale(1.1);
}

.lightbox .nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox .nav:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1);
}

.lightbox .nav.prev {
    left: 2rem;
}

.lightbox .nav.next {
    right: 2rem;
}

.lightbox-info {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(30, 41, 59, 0.9);
    padding: 1rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    text-align: center;
    backdrop-filter: blur(10px);
    max-width: 90%;
}

.lightbox-info .filename {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.lightbox-info .meta {
    font-size: 0.875rem;
    color: var(--text-gray);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-card-hover);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline::before {
        width: 2px;
    }

    .timeline-year-marker {
        width: 2.5rem;
        height: 2.5rem;
        left: -2rem;
        font-size: 0.75rem;
    }

    .lightbox .nav {
        width: 44px;
        height: 44px;
        font-size: 1.25rem;
    }

    .lightbox .nav.prev {
        left: 0.5rem;
    }

    .lightbox .nav.next {
        right: 0.5rem;
    }

    .lightbox .close {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
        top: 1rem;
        right: 1rem;
    }

    .lightbox-info {
        bottom: 1rem;
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-group select,
    .filter-group input {
        width: 100%;
    }
}

/* 瀑布流布局 */
.gallery-masonry {
    column-count: 3;
    column-gap: 1rem;
    margin-bottom: 1rem;
}

@media (max-width: 1024px) {
    .gallery-masonry {
        column-count: 2;
    }
}

@media (max-width: 640px) {
    .gallery-masonry {
        column-count: 1;
    }
}

.gallery-masonry .image-card {
    break-inside: avoid;
    margin-bottom: 1rem;
    display: inline-block;
    width: 100%;
}

/* 年份折叠样式 */
.timeline-year-header {
    cursor: pointer;
    transition: all 0.3s ease;
}

.timeline-year-header:hover {
    background: var(--bg-card-hover);
}

.timeline-year-header .toggle-icon {
    font-size: 1.25rem;
    color: var(--primary);
    transition: transform 0.3s ease;
}

.timeline-year-header.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

/* 懒加载样式 */
.lazy-image {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-image.loaded {
    opacity: 1;
}

.image-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--text-gray);
    background: var(--bg-card);
    z-index: 1;
}

.lazy-image.loaded + .image-placeholder {
    display: none;
}

/* 折叠动画 */
.month-group {
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}