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       BLOG — Cluster index pages
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       BLOG — Cluster 1: Ingredient Education (Articles 1–10)
       ══════════════════════════════════════════════════════════ -->
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       BLOG — Cluster 2: Ingredient Compatibility (Articles 11–20)
       ══════════════════════════════════════════════════════════ -->
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       BLOG — Cluster 3: Skin Concerns (Articles 21–30)
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       BLOG — Cluster 4: How-To Guides (Articles 31–40)
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       BLOG — Cluster 5: Science Deep Dives (Articles 41–50)
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