/* 相册详情页面特定样式 - 增强响应式支持 */
:root {
    --primary-blue: #1e40af;
    --secondary-blue: #3b82f6;
    --light-blue: #dbeafe;
    --accent-blue: #60a5fa;
    --white: #ffffff;
    --light-gray: #f8fafc;
    --medium-gray: #e2e8f0;
    --dark-gray: #475569;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --mobile-breakpoint: 768px;
    --tablet-breakpoint: 1024px;
}

body { 
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif; 
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%); 
    min-height: 100vh;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.container { 
    max-width: 1400px; 
    margin: 0 auto; 
    padding: 30px 20px; 
}

.header { margin-bottom: 40px; }
.back-link { 
    display: inline-flex; 
    align-items: center; 
    gap: 10px; 
    padding: 12px 24px; 
    background: var(--white); 
    color: var(--primary-blue); 
    text-decoration: none; 
    border-radius: var(--border-radius); 
    box-shadow: var(--shadow-sm);
    margin-bottom: 25px;
    transition: all 0.3s ease;
    border: 1px solid var(--medium-gray);
    font-weight: 500;
}
.back-link:hover { 
    background: var(--light-blue);
    transform: translateX(-5px);
    box-shadow: var(--shadow-md);
    color: var(--primary-blue);
}
.album-title { 
    color: var(--text-dark); 
    font-size: 2.5rem; 
    text-align: center; 
    margin-bottom: 15px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.album-info { 
    text-align: center; 
    color: var(--text-light); 
    font-size: 1.2rem;
    margin-bottom: 40px;
    background: var(--white);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--medium-gray);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* 智能图片网格布局 - 自适应瀑布流效果 */
.images-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 25px; 
    margin-bottom: 50px;
    align-items: start; /* 顶部对齐 */
}

/* 大屏幕下的优化布局 */
@media (min-width: 1200px) {
    .images-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px;
    }
}

/* 宽幅图片布局 - 超宽图片 (ratio > 1.5) */
.image-item.landscape { 
    grid-column: span 1;
}

.image-item.landscape img {
    aspect-ratio: 16/9;
    height: auto;
    width: 100%;
    object-fit: cover;
}

/* 竖幅图片布局 - 超高图片 (ratio < 0.67) */
.image-item.portrait { 
    grid-column: span 1;
}

.image-item.portrait img {
    aspect-ratio: 3/4;
    height: auto;
    width: 100%;
    object-fit: cover;
}

/* 较宽图片布局 (1.3 < ratio ≤ 1.5) */
.image-item.wide { 
    grid-column: span 1;
}

.image-item.wide img {
    aspect-ratio: 4/3;
    height: auto;
    width: 100%;
    object-fit: cover;
}

/* 较高图片布局 (0.83 ≤ ratio < 1.3) */
.image-item.tall { 
    grid-column: span 1;
}

.image-item.tall img {
    aspect-ratio: 3/4;
    height: auto;
    width: 100%;
    object-fit: cover;
}

/* 方形图片布局 (接近1:1) */
.image-item.square { 
    grid-column: span 1;
}

.image-item.square img {
    aspect-ratio: 1/1;
    height: auto;
    width: 100%;
    object-fit: cover;
}

/* 默认图片样式（未分类的图片） */
.image-item { 
    position: relative; 
    overflow: hidden; 
    border-radius: var(--border-radius); 
    box-shadow: var(--shadow-lg);
    background: var(--white);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--medium-gray);
}

.image-item:hover { 
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-blue);
}

/* 通用图片样式 - 移除固定高度，使用自适应 */
.image-item img { 
    width: 100%; 
    height: auto; /* 改为自适应高度 */
    object-fit: cover; 
    display: block;
    transition: transform 0.5s ease;
}

.image-item:hover img { 
    transform: scale(1.05);
}
.image-caption { 
    padding: 12px; 
    text-align: center; 
    color: var(--text-dark);
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.4;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.image-caption small {
    background: var(--light-gray);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-light);
}

/* 收藏按钮样式 */
.favorite-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    opacity: 0;
    z-index: 10;
}

.image-item:hover .favorite-btn {
    opacity: 1;
}

.favorite-btn:hover {
    background: rgba(255, 255, 255, 1);
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.favorite-btn.favorited {
    color: #ec4899;
    background: rgba(236, 72, 153, 0.1);
}

.favorite-btn.favorited:hover {
    background: rgba(236, 72, 153, 0.2);
}

.favorite-btn i {
    font-size: 16px;
    transition: all 0.3s ease;
}

/* 触摸设备显示收藏按钮 */
@media (hover: none) and (pointer: coarse) {
    .favorite-btn {
        opacity: 0.7;
    }
    
    .image-item:active .favorite-btn {
        opacity: 1;
        transform: scale(1.1);
    }
}

/* 图片加载状态 */
.image-loading {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.image-loading .fa-spinner {
    font-size: 1.5rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 图片查看器样式 */
.lightbox { 
    display: none; 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background: rgba(30, 41, 59, 0.95); 
    z-index: 1000; 
    justify-content: center; 
    align-items: center;
    flex-direction: column;
    backdrop-filter: blur(10px);
}
.lightbox img { 
    max-width: 85%; 
    max-height: 75%; 
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}
.lightbox-close { 
    position: absolute; 
    top: 30px; 
    right: 40px; 
    color: var(--white); 
    font-size: 36px; 
    cursor: pointer;
    z-index: 1001;
    background: rgba(255, 255, 255, 0.1);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}
.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}
.lightbox-nav { 
    position: absolute; 
    top: 50%; 
    width: 100%; 
    display: flex; 
    justify-content: space-between; 
    padding: 0 20px;
    transform: translateY(-50%);
    z-index: 1001;
}
.lightbox-nav button { 
    background: rgba(255,255,255,0.2);
    color: var(--white);
    font-size: 30px; 
    padding: 12px 24px; 
    cursor: pointer; 
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.lightbox-nav button:hover { 
    background: rgba(255,255,255,0.3);
    transform: scale(1.1);
    border-color: rgba(255, 255, 255, 0.3);
}
.lightbox-info { 
    color: var(--white); 
    text-align: center; 
    margin-top: 25px;
    font-size: 1.2rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 15px 25px;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    max-width: 80%;
}

/* 响应式媒体查询 - 移动端优化 */
@media (max-width: 1024px) {
    .container {
        padding: 25px 15px;
    }
    
    .header {
        margin-bottom: 35px;
    }
    
    .album-title {
        font-size: 2.2rem;
    }
    
    .album-info {
        font-size: 1.1rem;
        padding: 18px;
        margin-bottom: 35px;
    }
    
    .images-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 20px;
    }
    
    .image-item img {
        height: auto; /* 自适应高度 */
    }
    
    .lightbox img {
        max-width: 90%;
        max-height: 70%;
    }
    
    .lightbox-close {
        top: 20px;
        right: 25px;
        font-size: 30px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    .header {
        margin-bottom: 30px;
    }
    
    .back-link {
        padding: 10px 20px;
        font-size: 0.9rem;
        margin-bottom: 20px;
    }
    
    .album-title {
        font-size: 1.8rem;
        margin-bottom: 12px;
    }
    
    .album-info {
        font-size: 1rem;
        padding: 15px;
        margin-bottom: 30px;
    }
    
    .images-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 15px;
    }
    
    .image-item {
        border-radius: 10px;
    }
    
    .image-item img {
        height: auto; /* 自适应高度 */
    }
    
    .image-caption {
        padding: 10px;
        font-size: 0.85rem;
    }
    
    .image-caption small {
        font-size: 0.75rem;
        padding: 3px 6px;
    }
    
    .lightbox {
        padding: 20px;
    }
    
    .lightbox img {
        max-width: 95%;
        max-height: 65%;
    }
    
    .lightbox-close {
        top: 15px;
        right: 15px;
        font-size: 24px;
        width: 40px;
        height: 40px;
    }
    
    .lightbox-nav {
        padding: 0 10px;
    }
    
    .lightbox-nav button {
        font-size: 24px;
        padding: 10px 20px;
    }
    
    .lightbox-info {
        font-size: 1rem;
        padding: 12px 20px;
        margin-top: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px 10px;
    }
    
    .header {
        margin-bottom: 25px;
    }
    
    .back-link {
        padding: 8px 16px;
        font-size: 0.85rem;
        margin-bottom: 15px;
    }
    
    .album-title {
        font-size: 1.6rem;
        margin-bottom: 10px;
    }
    
    .album-info {
        font-size: 0.9rem;
        padding: 12px;
        margin-bottom: 25px;
    }
    
    .images-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .image-item img {
        height: auto; /* 自适应高度 */
    }
    
    .image-caption {
        padding: 8px;
        font-size: 0.8rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
    
    .lightbox {
        padding: 15px;
    }
    
    .lightbox img {
        max-width: 100%;
        max-height: 60%;
    }
    
    .lightbox-close {
        top: 10px;
        right: 10px;
        font-size: 20px;
        width: 35px;
        height: 35px;
    }
    
    .lightbox-nav {
        padding: 0 5px;
    }
    
    .lightbox-nav button {
        font-size: 20px;
        padding: 8px 16px;
    }
    
    .lightbox-info {
        font-size: 0.9rem;
        padding: 10px 15px;
        margin-top: 15px;
        max-width: 95%;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .image-item:hover {
        transform: none;
        box-shadow: var(--shadow-lg);
    }
    
    .image-item:active {
        transform: scale(0.98);
        box-shadow: var(--shadow-md);
    }
    
    .back-link:hover {
        transform: none;
    }
    
    .back-link:active {
        transform: scale(0.95);
    }
    
    .lightbox-nav button:hover {
        transform: none;
    }
    
    .lightbox-nav button:active {
        transform: scale(0.9);
    }
    
    .lightbox-close:hover {
        transform: none;
    }
    
    .lightbox-close:active {
        transform: scale(0.9);
    }
}

/* 横屏模式优化 */
@media (orientation: landscape) and (max-height: 500px) {
    .lightbox {
        flex-direction: row;
        align-items: center;
    }
    
    .lightbox img {
        max-width: 70%;
        max-height: 85%;
    }
    
    .lightbox-info {
        margin-top: 0;
        margin-left: 20px;
        max-width: 25%;
    }
}

/* 高分辨率屏幕优化 */
@media (min-resolution: 2dppx) {
    .image-item img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
    
    .lightbox img {
        image-rendering: auto;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-blue: #3b82f6;
        --light-blue: #1e293b;
        --white: #0f172a;
        --light-gray: #334155;
        --medium-gray: #475569;
        --text-dark: #f1f5f9;
        --text-light: #cbd5e1;
    }
    
    body {
        background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
    }
}

@media (max-width: 768px) {
    .images-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
    .album-title { font-size: 1.8rem; }
    .lightbox img { max-width: 95%; max-height: 60%; }
    .lightbox-nav button { font-size: 24px; padding: 10px 18px; }
    .container { padding: 20px 15px; }
    .album-info { font-size: 1.1rem; padding: 15px; }
}