style(theme): 暗色使用 Alright 同款深色背景

- 新增 site-bg-dark.jpg(Alright 演示站深色背景)
- 明暗背景拆成两层交叉淡入,切换时不再露出单层底色
- 保留 65vh 高度与底部渐隐
This commit is contained in:
2026-11-03 20:18:29 +08:00
parent 1f8147dd73
commit b9005dd514
3 changed files with 28 additions and 11 deletions
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