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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 20px 0 30px;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #2c3e50;
}

/* 日期分组 */
.date-group {
    margin-bottom: 30px;
}

.date-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #666;
    padding: 10px 0;
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 15px;
}

/* 图片网格 */
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

/* 缩略图卡片 */
.thumbnail-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.thumbnail-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.thumbnail-wrapper {
    position: relative;
    width: 100%;
    padding-top: 100%;
    background: #f0f0f0;
    overflow: hidden;
}

.thumbnail-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
}

.thumbnail-info {
    padding: 8px 10px;
    font-size: 0.75rem;
    color: #888;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.long-image-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7rem;
}

/* 加载提示 */
.loading {
    text-align: center;
    padding: 50px;
    color: #888;
}

.empty {
    text-align: center;
    padding: 100px 20px;
    color: #999;
}

/* ========== 图片查看器 ========== */
.viewer {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.95);
    z-index: 1000;
    flex-direction: column;
}

.viewer.active {
    display: flex;
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: rgba(30,30,30,0.9);
    color: #fff;
    flex-shrink: 0;
    z-index: 10;
}

#viewer-info {
    font-size: 1.0rem;
    opacity: 0.8;
}

.close-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px 15px;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.close-btn:hover {
    opacity: 1;
}

/* 核心：可滚动的图片容器 */
.viewer-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch; /* iOS 平滑滚动 */
    scroll-behavior: smooth;
}

/* 内部容器，用于居中 */
.viewer-image-wrapper {
    min-height: 100%;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
}

/* 图片样式 - 关键修改 */
.viewer-image-wrapper img {
    display: block;
    max-width: 100%;
    width: auto;
    height: auto;
}

/* 
 * 长图模式：图片宽度适应屏幕，高度自然延伸
 * 非长图：如果图片较小则原尺寸显示，较大则适应屏幕
 */
.viewer-image-wrapper img.long-image {
    width: 100%;
    max-width: 750px; /* 适合阅读的最大宽度 */
    height: auto;
}

.viewer-image-wrapper img.normal-image {
    width: 100%;
    max-width: 750px; /* 适合阅读的最大宽度 */
    height: auto;
}

/* 滚动条美化 */
.viewer-content::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.viewer-content::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
}

.viewer-content::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.3);
    border-radius: 4px;
}

.viewer-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.5);
}

/* 滚动进度指示器 */
.scroll-indicator {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 200px;
    background: rgba(255,255,255,0.2);
    border-radius: 2px;
    z-index: 20;
    opacity: 0;
    transition: opacity 0.3s;
}

.viewer.active .scroll-indicator.visible {
    opacity: 1;
}

.scroll-indicator-thumb {
    width: 100%;
    background: rgba(255,255,255,0.7);
    border-radius: 2px;
    position: absolute;
    top: 0;
    transition: top 0.1s;
}

/* 滚动提示 */
.scroll-hint {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    z-index: 20;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.scroll-hint.visible {
    opacity: 1;
}

.scroll-hint .icon {
    display: inline-block;
    animation: bounce 1.5s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(5px); }
}

/* 移动端适配 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 1.4rem;
    }
    
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 10px;
    }
    
    .viewer-header {
        padding: 8px 15px;
    }
    
    #viewer-info {
        font-size: 0.75rem;
    }

	.close-btn {
		font-size: 1.0rem;
	}
    
    .viewer-image-wrapper {
        padding: 10px;
    }
    
    .viewer-image-wrapper img.long-image {
        max-width: 100%;
        width: 100%;
    }
    
    .scroll-indicator {
        right: 10px;
        height: 150px;
    }
}