/* ============================================================
   相册详情页样式 - 瀑布流布局 + 分类标签
   ============================================================ */

:root {
    --primary-blue: #1e40af;
    --secondary-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --white: #ffffff;
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --bg-hover: #f1f5f9;
    --border-gray: #e5e7eb;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);
    --radius: 8px;
    --radius-card: 12px;
    --radius-lg: 16px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 20px;
}

/* ============ 顶部返回按钮 ============ */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-surface);
    color: var(--secondary-blue);
    text-decoration: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    transition: all 0.2s ease;
    border: 1px solid var(--border-gray);
    font-weight: 500;
    font-size: 0.9rem;
}

.back-link:hover {
    background: var(--bg-hover);
    transform: translateX(-3px);
    box-shadow: var(--shadow-md);
}

/* ============ 相册标题区 ============ */
.header {
    text-align: center;
    margin-bottom: 32px;
}

.album-title {
    color: var(--text-dark);
    font-size: 2rem;
    margin-bottom: 12px;
    font-weight: 700;
    line-height: 1.3;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding: 0 20px;
}

.album-info {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    color: var(--text-light);
    font-size: 0.95rem;
    padding: 10px 20px;
    background: var(--bg-surface);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-gray);
}

.album-info i { color: var(--secondary-blue); }

/* ============ 相册标签区（新：分类着色） ============ */
.album-meta-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin: 20px auto 32px;
    max-width: 900px;
}

.meta-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    border: 1px solid transparent;
}

.meta-chip:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.meta-chip:active { transform: translateY(0); }

.meta-chip i { font-size: 0.75rem; }

/* 人物标签 */
.meta-chip-person {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    color: var(--accent-purple);
    border-color: rgba(139, 92, 246, 0.2);
}

.meta-chip-person:hover {
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-pink) 100%);
    color: var(--white);
    border-color: transparent;
}

/* 分类标签（按类别着色） */
.meta-chip-tag-style {
    background: #f0f9ff;
    color: #0284c7;
    border-color: #bae6fd;
}
.meta-chip-tag-style:hover { background: #0284c7; color: #fff; border-color: #0284c7; }

.meta-chip-tag-outfit {
    background: #fdf2f8;
    color: #db2777;
    border-color: #fbcfe8;
}
.meta-chip-tag-outfit:hover { background: #db2777; color: #fff; border-color: #db2777; }

.meta-chip-tag-scene {
    background: #f0fdf4;
    color: #15803d;
    border-color: #bbf7d0;
}
.meta-chip-tag-scene:hover { background: #15803d; color: #fff; border-color: #15803d; }

.meta-chip-tag-body {
    background: #fef3c7;
    color: #b45309;
    border-color: #fde68a;
}
.meta-chip-tag-body:hover { background: #b45309; color: #fff; border-color: #b45309; }

.meta-chip-tag-mood {
    background: #faf5ff;
    color: #7c3aed;
    border-color: #e9d5ff;
}
.meta-chip-tag-mood:hover { background: #7c3aed; color: #fff; border-color: #7c3aed; }

.meta-chip-tag-topic {
    background: #eff6ff;
    color: #0369a1;
    border-color: #bfdbfe;
}
.meta-chip-tag-topic:hover { background: #0369a1; color: #fff; border-color: #0369a1; }

/* 默认标签 */
.meta-chip-tag {
    background: var(--bg-hover);
    color: var(--text-light);
    border-color: var(--border-gray);
}
.meta-chip-tag:hover { background: var(--text-light); color: #fff; border-color: var(--text-light); }

/* ============ 瀑布流布局（核心） ============ */
.images-grid {
    column-count: 4;
    column-gap: 16px;
    margin-bottom: 40px;
}

/* 瀑布流中的每一项 */
.image-item {
    position: relative;
    display: inline-block;
    width: 100%;
    margin: 0 0 16px 0;
    overflow: hidden;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-sm);
    background: var(--bg-surface);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border-gray);
    break-inside: avoid;
    page-break-inside: avoid;
}

.image-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-blue);
}

/* 图片本身 - 保持原始比例（瀑布流关键） */
.image-item img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    transition: transform 0.4s ease;
}

.image-item:hover img {
    transform: scale(1.02);
}

/* 图片说明 */
.image-caption {
    padding: 10px 12px;
    color: var(--text-light);
    font-size: 0.8rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    border-top: 1px solid var(--border-gray);
}

.image-caption small {
    background: var(--bg-hover);
    padding: 3px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* 收藏按钮 */
.favorite-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.92);
    border: none;
    border-radius: 50%;
    width: 34px;
    height: 34px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s ease;
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    opacity: 0;
    z-index: 10;
}

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

.favorite-btn:hover {
    transform: scale(1.12);
    box-shadow: var(--shadow-md);
}

.favorite-btn.favorited {
    color: var(--accent-pink);
    background: rgba(236, 72, 153, 0.15);
}

.favorite-btn i { font-size: 15px; }

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

.image-loading .fa-spinner {
    font-size: 1.3rem;
    animation: spin 1s linear infinite;
}

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

/* 触摸设备收藏按钮常显 */
@media (hover: none) and (pointer: coarse) {
    .favorite-btn { opacity: 0.8; }
    .image-item:hover { transform: none; box-shadow: var(--shadow-sm); }
    .image-item:active { transform: scale(0.98); }
}

/* ============ 响应式：瀑布流列数 ============ */

/* 大屏幕（默认）：4列 */
@media (max-width: 1200px) {
    .images-grid { column-count: 3; column-gap: 14px; }
    .image-item { margin-bottom: 14px; }
}

/* 中等屏幕：3列 */
@media (max-width: 900px) {
    .images-grid { column-count: 2; column-gap: 12px; }
    .image-item { margin-bottom: 12px; }
    .album-title { font-size: 1.6rem; }
}

/* 手机：2列 */
@media (max-width: 600px) {
    .container { padding: 16px 12px; }
    .images-grid { column-count: 2; column-gap: 10px; }
    .image-item { margin-bottom: 10px; border-radius: var(--radius); }
    .album-title { font-size: 1.3rem; padding: 0 10px; }
    .album-info { font-size: 0.85rem; padding: 8px 14px; gap: 10px; }
    .back-link { padding: 8px 14px; font-size: 0.85rem; }
    .meta-chip { padding: 5px 11px; font-size: 0.8rem; }
    .image-caption { padding: 8px 10px; font-size: 0.75rem; }
    .favorite-btn { width: 30px; height: 30px; }
}

/* 小屏手机：1列 */
@media (max-width: 380px) {
    .images-grid { column-count: 1; }
}

/* ============ 图片查看器（保持原样） ============ */
.preview-modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.preview-modal.active { opacity: 1; visibility: visible; }

.preview-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
}

.preview-container {
    position: relative;
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 92vw;
    max-height: 90vh;
    width: 1200px;
    height: 800px;
    display: flex;
    flex-direction: column;
    transform: scale(0.92);
    transition: transform 0.3s ease;
}

.preview-modal.active .preview-container { transform: scale(1); }

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-gray);
    flex-shrink: 0;
}

.preview-title h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0 0 4px 0;
}

.preview-info { font-size: 0.85rem; color: var(--text-light); }

.preview-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.preview-nav {
    width: 36px; height: 36px;
    border: 1px solid var(--border-gray);
    border-radius: var(--radius);
    background: var(--bg-surface);
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.preview-nav:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--secondary-blue);
    color: var(--secondary-blue);
}

.preview-nav:disabled { opacity: 0.4; cursor: not-allowed; }

.preview-counter { font-size: 0.85rem; color: var(--text-light); font-weight: 500; }

.preview-close {
    width: 36px; height: 36px;
    border: none;
    border-radius: var(--radius);
    background: var(--bg-hover);
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.preview-close:hover { background: #ef4444; color: #fff; }

.preview-content {
    flex: 1;
    padding: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0f172a;
}

.preview-image-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: opacity 0.3s ease;
}

.preview-loading {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
}

.preview-loading i { font-size: 1.8rem; color: var(--secondary-blue); }

.preview-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-top: 1px solid var(--border-gray);
    flex-shrink: 0;
}

.preview-meta { display: flex; gap: 16px; }

.preview-meta .meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.preview-controls { display: flex; gap: 10px; }

.preview-action {
    padding: 7px 14px;
    border: 1px solid var(--border-gray);
    border-radius: var(--radius);
    background: var(--bg-surface);
    color: var(--text-dark);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.preview-action:hover { background: var(--bg-hover); }

.preview-remove { border-color: #fecaca; color: #dc2626; }
.preview-remove:hover { background: #fef2f2; border-color: #fca5a5; }

.preview-action.favorited { border-color: #fbcfe8; color: #ec4899; background: #fdf2f8; }
.preview-action.favorited:hover { background: #fce7f3; border-color: #f9a8d4; }

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-surface: #1e293b;
        --bg-hover: #334155;
        --border-gray: #334155;
        --text-dark: #f1f5f9;
        --text-light: #cbd5e1;
        --text-muted: #94a3b8;
    }
    .preview-container { background: var(--bg-surface); }
    .preview-nav, .preview-close, .preview-action { background: var(--bg-hover); color: var(--text-dark); border-color: var(--border-gray); }
}