模板系统

模板会在运行时展开成普通 clips，不应被理解为一个会自动把样式或动画传递给子元素的父容器。

1. 模板列表

当前支持：

product-intro
slideshow
subtitle-video
talking-head
comparison
countdown
text-reveal
news
quote
list

2. 通用限制

模板 clip 自己的以下字段，不作为已文档化的子 clip 继承行为：

transform
style
animations
keyframes
transition

模板内部控制应通过 data 传入。

3. `product-intro`

当前有效字段：

name
tagline
features
price
image
cta

渲染行为：

可选左侧产品图
右侧产品标题与说明
可选特性列表
可选价格
可选 CTA 文本

示例：

{
  "type": "template",
  "template": "product-intro",
  "start": 0,
  "duration": 8,
  "data": {
    "name": "Smart Watch Pro",
    "tagline": "Built for modern teams",
    "features": ["AMOLED display", "7-day battery", "Health tracking"],
    "price": "$299",
    "image": "https://example.com/watch.png",
    "cta": "Order Now"
  }
}

4. `slideshow`

当前有效字段：

images
durationPerSlide
showCaptions

渲染行为：

每张图片展开成一个 image clip
slide 使用当前内置切换行为
当图片项包含 caption 且 showCaptions !== false 时，会生成说明文字

示例：

{
  "type": "template",
  "template": "slideshow",
  "start": 0,
  "duration": 9,
  "data": {
    "images": [
      { "image": "https://example.com/slide-1.jpg", "caption": "Welcome" },
      { "image": "https://example.com/slide-2.jpg", "caption": "New Features" },
      { "image": "https://example.com/slide-3.jpg", "caption": "Get Started" }
    ],
    "durationPerSlide": 3,
    "showCaptions": true
  }
}

5. `subtitle-video`

当前有效字段：

src
words
config
source
volume
muted
playbackRate

渲染行为：

生成一个全屏 video
生成一个 subtitle

示例：

{
  "type": "template",
  "template": "subtitle-video",
  "start": 0,
  "duration": 8,
  "data": {
    "src": { "$ref": "host-video" },
    "words": { "$ref": "subtitle-main" },
    "muted": false,
    "volume": 1,
    "config": {
      "position": "bottom",
      "fontSize": 58,
      "highlightColor": "#22d3ee"
    }
  }
}

6. `talking-head`

当前有效字段：

src
words
config
source
volume
muted
playbackRate
speaker
role
title
showLowerThird

渲染行为：

生成一个全屏人物视频
可选顶部标题
可选底部 lower-third 信息条
可选字幕轨

示例：

{
  "type": "template",
  "template": "talking-head",
  "start": 0,
  "duration": 8,
  "data": {
    "src": { "$ref": "host-video" },
    "words": { "$ref": "subtitle-main" },
    "title": "Weekly Update",
    "speaker": "Alex Chen",
    "role": "Founder",
    "showLowerThird": true,
    "config": {
      "position": "bottom",
      "fontSize": 60,
      "highlightColor": "#22d3ee"
    }
  }
}

7. `comparison`

当前有效字段：

left.title
left.items
left.image
right.title
right.items
right.image
vsText

渲染行为：

生成左右对比区块
支持两侧可选图片与列表
生成中间分隔线和 VS 文本

示例：

{
  "type": "template",
  "template": "comparison",
  "start": 0,
  "duration": 7,
  "data": {
    "left": {
      "title": "Before",
      "items": ["Manual workflow", "Slow review", "Higher cost"],
      "image": "https://example.com/before.png"
    },
    "right": {
      "title": "After",
      "items": ["Automated workflow", "Fast review", "Lower cost"],
      "image": "https://example.com/after.png"
    },
    "vsText": "VS"
  }
}

8. `countdown`

当前有效字段：

from
to
showText
onComplete

渲染行为：

生成倒计时序列
临近结束时可显示提示文字
结束时可显示完成文案

示例：

{
  "type": "template",
  "template": "countdown",
  "start": 0,
  "duration": 6,
  "data": {
    "from": 5,
    "to": 0,
    "showText": true,
    "onComplete": "Launch"
  }
}

9. `text-reveal`

当前有效字段：

text
style
fontSize
color
textAlign
position

当前文档化的 style 值：

fade
slide
zoom

渲染行为：

生成分阶段出现的文字 clips
在当前已实现范围内应用指定 reveal 样式

示例：

{
  "type": "template",
  "template": "text-reveal",
  "start": 0,
  "duration": 5,
  "data": {
    "text": "Ship faster with AI video",
    "style": "slide",
    "fontSize": 72,
    "color": "#ffffff",
    "textAlign": "center",
    "position": "center"
  }
}

10. `news`

当前有效字段：

headline
content
reporter
location
showLowerThird

渲染行为：

主标题
可选内容区
可选底部信息条

示例：

{
  "type": "template",
  "template": "news",
  "start": 0,
  "duration": 8,
  "data": {
    "headline": "Quarterly results exceed expectations",
    "content": "Revenue grew 38% year over year, driven by strong subscription growth.",
    "reporter": "Maya Lin",
    "location": "San Francisco",
    "showLowerThird": true
  }
}

11. `quote`

当前有效字段：

quote
author
source

渲染行为：

渲染引用文本
可选作者与来源行

示例：

{
  "type": "template",
  "template": "quote",
  "start": 0,
  "duration": 6,
  "data": {
    "quote": "Simplicity scales better than complexity.",
    "author": "Alex Chen",
    "source": "Team Memo"
  }
}

12. `list`

当前有效字段：

title
items
style
itemDuration
animation

渲染行为：

可选标题
顺序生成列表项
支持前缀样式与条目动画
itemDuration: "auto" 会自动分配总时长

示例：

{
  "type": "template",
  "template": "list",
  "start": 0,
  "duration": 8,
  "data": {
    "title": "Release Checklist",
    "items": ["Finalize copy", "Export assets", "Publish update"],
    "style": "checkmark",
    "itemDuration": "auto",
    "animation": "fadeIn"
  }
}

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