fix(web): 内容区顶部渐隐恢复(content-veil)
- 滚动后用 sticky 遮罩在内容顶端做 32px 渐变,避免卡片/标题被硬切 - 未滚动时 opacity 0,滚动阈值沿用 scrolled 状态(>4px) - 尊重 reduced-motion
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@@ -159,6 +159,29 @@
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padding-bottom: var(--su-space-10);
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}
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/* 顶部渐隐:sticky 固定在滚动区顶端,内容从下面淡出而不是被硬切 */
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.content-veil {
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position: sticky;
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top: 0;
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z-index: 5;
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height: 32px;
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margin-bottom: -32px;
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pointer-events: none;
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opacity: 0;
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background: linear-gradient(to bottom, var(--su-bg-page) 0%, transparent 100%);
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transition: opacity var(--su-duration-fast) var(--su-ease-in-out);
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}
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.content-veil.is-visible {
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opacity: 1;
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}
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@media (prefers-reduced-motion: reduce) {
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.content-veil {
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transition: none;
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}
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}
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.sidebar {
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display: flex;
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flex-direction: column;
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