<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="template:media-width" content="1024">
    <meta name="template:media-height" content="1024">
    <style>
        html {
            margin: 0;
            padding: 0;
        }

        body {
            margin: 0;
            padding: 0;
            width: 1080px;
            height: 1920px;
            font-family: 'PingFang SC', 'Source Han Sans', 'Microsoft YaHei', sans-serif;
            overflow: hidden;
        }

        .page-container {
            width: 1080px;
            height: 1920px;
            position: relative;
            overflow: hidden;
        }

        /* 1. Background Media Layer (背景媒体层) 
           - For image assets: displays the image
           - For video assets: hidden (video is composited in later step)
        */
        .background-layer {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
        }

        .background-layer img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            display: block;
        }

        /* Hide background layer when no image (video mode) */
        .background-layer:empty {
            display: none;
        }

        /* 2. Gradient Overlay (渐变遮罩) 
           Ensures text readability regardless of background brightness
           Top: Darker for Title
           Middle: Transparent for Media visibility
           Bottom: Darker for Subtitles
        */
        .gradient-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            background: linear-gradient(to bottom,
                    rgba(0, 0, 0, 0.6) 0%,
                    rgba(0, 0, 0, 0.1) 25%,
                    rgba(0, 0, 0, 0.1) 60%,
                    rgba(0, 0, 0, 0.8) 100%);
        }

        /* 3. Content Layer (内容层) */
        .content-layer {
            position: relative;
            z-index: 2;
            width: 100%;
            height: 100%;
            padding: 120px 80px 0px 80px;
            /* Top, Right, Bottom, Left */
            box-sizing: border-box;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            color: #ffffff;
        }

        /* Title Styling */
        .video-title {
            font-size: 80px;
            font-weight: 700;
            line-height: 1.2;
            text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
            margin-bottom: 40px;
            text-align: center;
        }

        /* Hide title when empty */
        .video-title:empty {
            display: none;
        }

        /* Flex spacer to push subtitle to bottom */
        .spacer {
            flex-grow: 1;
        }

        /* Narration/Subtitle Styling */
        .subtitle-wrapper {
            margin-bottom: 60px;
        }

        .text {
            font-size: 52px;
            font-weight: 500;
            line-height: 1.6;
            text-align: center;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
        }
    </style>
</head>

<body>
    <div class="page-container">
        <!-- Background Media Layer 
             - For image assets: contains <img> tag
             - For video assets: empty (hidden by CSS)
        -->
        <div class="background-layer" id="bg-layer">
            <!-- Image will be inserted here for image assets only -->
        </div>

        <!-- Shadow Overlay for Text Readability -->
        <div class="gradient-overlay"></div>

        <!-- Main Content -->
        <div class="content-layer">
            <!-- Top Section: Title -->
            <div class="video-title">
                {{title}}
            </div>

            <!-- Spacer pushes content apart -->
            <div class="spacer"></div>

            <!-- Bottom Section: Narration/Text -->
            <div class="subtitle-wrapper">
                <div class="text">{{text}}</div>
            </div>
        </div>
    </div>

    <script>
        // Conditionally add image if provided
        (function () {
            var imageUrl = "{{image}}";
            var bgLayer = document.getElementById('bg-layer');

            // Only add img tag if image URL is provided and not empty
            if (imageUrl && imageUrl.trim() !== "" && imageUrl !== "None") {
                var img = document.createElement('img');
                img.src = imageUrl;
                img.alt = "Background";
                bgLayer.appendChild(img);
            }
            // Otherwise, bg-layer stays empty and gets hidden by CSS
        })();
    </script>
</body>

</html>