We need to produce JSON with keys: summary, category, article_html. The article should be a comprehensive article about best books to read this summer 2025 and this fall 2025. Must follow rules: exactly one H1 at start with primary keyword. The primary keyword likely "best books to read this summer 2025" or maybe "best books to read this summer and fall 2025". But only one H1. Use H2 for 5-7 main sections, H3 for subsections. Each section should have 2-3 p tags, each 100-150 words. That means each paragraph 100-150 words. That's a lot. 5 sections, each 2-3 paragraphs => about 10-15 paragraphs, each 100-150 words => 1000-2250 words. Minimum 1500 words. That is okay. We need to embed book recommendations, authors, key takeaways. Use UL/OL for lists (5-10 items). Use strong tags for key terms. End with 3-5 FAQ questions as H3. But we already used H3 for subsections. But we can have H3 for FAQ at the end; no conflict. Must be valid HTML. Also need to ensure the article total words >=1500. We need to produce 1500+ words. We need to produce JSON with summary (150-160 chars). Category "howto". article_html string containing the HTML. We must not include markdown or code fences. Just JSON. We must ensure the HTML is valid. Use proper tags. We need to produce the article in HTML. Use paragraphs with 100-150 words. Let's plan: H1: "Best Books to Read This Summer 2025 and Fall 2025". That is primary keyword. Then H2 sections: maybe "Summer 2025: Fiction Must-Reads", "Summer 2025: Non-Fiction Gems", "Fall 2025: Fiction Picks", "Fall 2025: Non-Fiction Must-Reads", "Cross-Season Recommendations That Stand the Test of Time". That's 5 H2s. Each H2 will have 2-3 paragraphs. Let's plan 3 paragraphs each. Each paragraph 120 words approx. That gives 3 paragraphs * 5 sections = 15 paragraphs *120 = 1800 words. Good. Each paragraph must be 100-150 words. We'll ensure that. We need to use UL/OL lists within sections. Possibly within paragraphs or separate. We need strong tags for key terms. At the end, we need FAQ section: H3 tags for each question. maybe 4 FAQs. Make sure we maintain the structure. Now we must write the paragraphs. We'll need to count words. Let's approximate. We must produce final JSON string. The article_html string can contain line breaks; but JSON requires escaping. We'll produce a single-line string or use \n. It's fine to include line breaks as \n escaped. But easier to produce minimal line breaks. Let's just produce as string with newlines escaped. But we can produce normal line breaks, JSON parser can handle. But to be safe, we should escape line breaks as \n. But the instruction says "Return ONLY valid JSON (no markdown, no code fences)". So we can produce JSON with line breaks inside string, but they must be escaped or else JSON invalid. We should escape newlines as \n. We'll produce a single-line string with \n. That is valid. Let's craft paragraphs: Paragraph 1 under H2 "Summer 2025: Fiction Must-Reads": We'll talk about the trend of contemporary fiction, mention a specific book: "The Ministry of Utmost Happiness" by Arundhati Roy? But maybe better: "The Night Circus" by Erin Morgenstern? But better to choose trending summer releases. Let's pick "The Midnight Library" by Matt Haig, "Where the Crawdads Sing" by Delia Owens, "The Song of Achilles" by Madeline Miller? But we need 5-10 items list. Use UL list of recommended books. We need to keep each paragraph 100-150 words. We'll attempt to write about 120 words. We must count. Let's draft a paragraph ~120 words. We'll approximate. Paragraph 1: talk about the power of summer reading, mention the vibe, the top picks. Paragraph 2: talk about reading environment, suggestions for reading outdoors, note the books. Paragraph 3: talk about how to incorporate these books into reading list, mention reading clubs, etc. We need to add UL list with 5-10 items maybe in paragraph 1 or separate. Let's put UL after paragraph 2. We need strong tags for key terms like "futuristic", "historical", "mind-bending". Also include book recommendations with authors and key takeaways. Similarly for other sections. Let's start drafting. We need to ensure each paragraph 100-150 words. Let's count words manually or approximate. We can approximate 120 words each. Let's draft. Paragraph 1: "Summer 2025 is the perfect backdrop for a literary adventure—warm breezes, lazy afternoons, and a curated list of titles that promise to transport, challenge, and delight. From sweeping historical sagas to breath‑taking psychological thrillers, the season’s best fiction blends escapism with depth, making it ideal for both casual loungers and avid bibliophiles. Among the top picks, The Midnight Library by Matt Haig offers a multiverse of second chances, while Where the Crawdads Sing by Delia Owens provides a haunting blend of nature and mystery. Complementing these are the lush romance of The Lost Husband by Anna Petersen and the speculative wonder of Project Hail Mary by Andy Weir. Each book captures the essence of summer’s fleeting moments, encouraging readers to explore new horizons." Let's count words: I'll count roughly: Summer(1) 2025(2) is3 the4 perfect5 backdrop6 for7 a8 literary9 adventure—warm10 breezes,11 lazy12 afternoons,13 and14 a15 curated16 list17 of18 titles19 that20 promise21 to22 transport,23 challenge,24 and25 delight.26 From27 sweeping28 historical29 sagas30 to31 breath‑taking32 psychological33 thrillers,34 the35 season’s36 best37 fiction38 blends39 escapism40 with41 depth,42 making43 it44 ideal45 for46 both47 casual48 loungers49 and50 avid51 bibliophiles.52 Among53 the54 top55 picks,56 The57 Midnight58 Library59 by60 Matt Haig61 offers62 a63 multiverse64 of65 second66 chances,67 while68 Where69 the70 Crawdads71 Sing72 by73 Delia Owens74 provides75 a76 haunting77 blend78 of79 nature80 and81 mystery.82 Complementing83 these84 are85 the86 lush87 romance88 of89 The90 Lost91 Husband92 by93 Anna Petersen94 and95 the96 speculative97 wonder98 of99 Project100 Hail101 Mary102 by103 Andy104 Weir105.106 Each107