/*
 * ================================================================
 * 媒体预览共享组件样式（支持图片、视频、音频）
 * ================================================================
 * 【同步更新提醒】以下 4 处使用了统一的全屏媒体预览功能，
 * 交互行为（缩放、平移、惯性、双击关闭等）必须保持完全一致。
 * 修改任何一处时，请同步检查并更新其余 3 处：
 *
 *   1. 画布全屏查看（参考实现）  → board-frontend/src/components/MediaViewer.tsx
 *   2. 社区瀑布流大图查看        → templates/community/index.html
 *   3. 后台多媒体管理查看        → templates/admin/media/mediaasset/change_list.html
 *   4. 画布作品列表大图查看      → templates/my/creations_board_list.html
 *
 * 共享组件文件（2、3、4 共用）：
 *   - templates/components/image_preview.html  （HTML 结构）
 *   - static/css/image_preview.css             ← 当前文件（样式）
 *   - static/js/image_preview.js               （交互逻辑）
 * ================================================================
 */

/* 大图预览浮层 */
.image-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 背景遮罩 */
.preview-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
}

/* 关闭按钮 */
.preview-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    cursor: pointer;
    z-index: 10002;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.preview-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.preview-close-btn i {
    font-size: 20px;
    color: white;
}

.preview-close-btn img {
    width: 20px;
    height: 20px;
    filter: brightness(0) invert(1);
}

/* 无限画布容器 - 占满全屏，信息栏浮动在上面 */
.preview-canvas {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    z-index: 10000;
}

/* 图片包装器 */
.preview-image-wrapper {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transform-origin: center center;
    will-change: transform;
}

.preview-image-wrapper img#preview-image {
    max-width: 90vw;
    max-height: 90vh;
    display: block;
    pointer-events: none;
    user-select: none;
    -webkit-user-drag: none;
}

/* 视频容器 */
.preview-video-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.preview-video-container video {
    max-width: 90vw;
    max-height: calc(100vh - 180px);
    border-radius: 8px;
    background: #000;
    display: block;
    pointer-events: none;
    user-select: none;
}

/* 视频控制条 */
.preview-video-controls {
    width: 100%;
    max-width: 800px;
    margin-top: 16px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 8px;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    pointer-events: auto;
    z-index: 10005;
}

.preview-video-play-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    transition: background 0.15s;
    flex-shrink: 0;
}

.preview-video-play-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.preview-video-time {
    color: white;
    font-size: 12px;
    min-width: 40px;
    flex-shrink: 0;
}

.preview-video-time:last-child {
    text-align: right;
}

.preview-video-progress {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
}

.preview-video-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: #8B5CF6;
    border-radius: 3px;
    transition: width 0.1s;
    pointer-events: none;
}

.preview-video-progress-thumb {
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-50%, -50%);
    width: 14px;
    height: 14px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    transition: left 0.1s;
}

/* 音频播放器容器 */
.preview-audio-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    width: 400px;
    max-width: 90%;
    background: rgba(30, 30, 30, 0.9);
    border-radius: 16px;
    padding: 32px;
}

.preview-audio-icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8B5CF6, #6366F1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: white;
}

.preview-audio-title {
    color: white;
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preview-audio-controls {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    pointer-events: auto;
}

.preview-audio-progress {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
}

.preview-audio-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: #8B5CF6;
    border-radius: 3px;
    transition: width 0.1s;
    pointer-events: none;
}

.preview-audio-progress-thumb {
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-50%, -50%);
    width: 14px;
    height: 14px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    transition: left 0.1s;
}

.preview-audio-time-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.preview-audio-time {
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
    min-width: 40px;
}

.preview-audio-time:last-child {
    text-align: right;
}

.preview-audio-play-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    transition: transform 0.15s;
}

.preview-audio-play-btn:hover {
    transform: scale(1.1);
}

/* 底部工具栏 */
.preview-toolbar {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 6px;
    padding: 6px 12px;
    z-index: 10003;
    pointer-events: auto;
}

.preview-toolbar-btn {
    width: 28px;
    height: 28px;
    border-radius: 4px;
    border: none;
    background: transparent;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
    font-size: 18px;
}

.preview-toolbar-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.preview-toolbar-scale {
    color: white;
    font-size: 12px;
    min-width: 50px;
    text-align: center;
    line-height: 28px;
}

.preview-toolbar-divider {
    width: 1px;
    height: 20px;
    background: rgba(255, 255, 255, 0.3);
    margin: 0 4px;
}

/* 快捷键提示 */
.preview-help-overlay {
    position: fixed;
    bottom: 16px;
    right: 16px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 12px;
    pointer-events: none;
    z-index: 10002;
}

/* 左上角元数据浮层（参考画布 MediaViewer 风格） */
.preview-meta-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10002;
    color: rgba(255, 255, 255, 0.8);
    font-size: 12px;
    line-height: 1.8;
    pointer-events: auto;
    max-width: 360px;
}

.preview-meta-brand {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.9);
    letter-spacing: 1px;
}

.preview-meta-line {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-meta-line:empty {
    display: none;
}

.preview-meta-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 2px;
    margin-bottom: 2px;
}

.preview-meta-tags:empty {
    display: none;
}

.preview-meta-tags .preview-tag {
    height: 18px;
    padding: 0 6px;
    font-size: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.7);
    border-radius: 3px;
    display: inline-flex;
    align-items: center;
    pointer-events: auto;
    cursor: default;
}

.preview-meta-stats {
    display: flex;
    gap: 12px;
    margin-top: 4px;
}

.preview-meta-stats:empty {
    display: none;
}

.preview-meta-stat {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.6);
}

.preview-meta-stat i {
    font-size: 12px;
}

/* 左侧浮层 - 下载链接与生成参数折叠区块 */
.preview-meta-download,
.preview-gen-toggle {
    cursor: pointer;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.preview-meta-download:hover,
.preview-gen-toggle:hover {
    color: white;
}

.preview-gen-toggle {
    display: none;
}

.preview-gen-content {
    margin-top: 5px;
    padding-right: 10px;
    font-size: 11px;
    line-height: 1.7;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

.preview-gen-content::-webkit-scrollbar {
    width: 4px;
}

.preview-gen-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

.preview-gen-row {
    display: flex;
    gap: 8px;
}

.preview-gen-key {
    color: rgba(255, 255, 255, 0.5);
    flex-shrink: 0;
    min-width: 80px;
}

.preview-gen-val {
    color: rgba(255, 255, 255, 0.85);
    word-break: break-all;
    white-space: pre-wrap;
}

/* 响应式 */
@media (max-width: 768px) {
    .preview-canvas {
        right: 0;
    }
    
    .preview-close-btn {
        top: 10px;
        right: 10px;
        width: 36px;
        height: 36px;
    }
    
    .preview-close-btn img {
        width: 18px;
        height: 18px;
    }
    
    .preview-toolbar {
        bottom: 16px;
    }
    
    .preview-video-controls {
        max-width: 100%;
        padding: 8px 12px;
    }
}



/* ========================================
   加载中 / 加载失败 覆盖层
   ======================================== */

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

@keyframes preview-fadein {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 加载中 */
.preview-loading-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    z-index: 10010;
    opacity: 0;
    animation: preview-fadein 0.3s ease-out 0.3s forwards;
}

.preview-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: preview-spin 0.8s linear infinite;
}

.preview-loading-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
}

/* 加载失败 */
.preview-error-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    z-index: 10010;
}

.preview-error-icon {
    font-size: 48px;
    color: rgba(255, 100, 100, 0.8);
}

.preview-error-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.preview-retry-btn {
    margin-top: 5px;
    padding: 8px 24px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
}

.preview-retry-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}