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"favicon": "https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a17e4a429d54e956e2a763_favicon.png", "ogImage": "https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a1e9409d6b1c287c69da0d_Website%20preview.png", "logoHref": "/" }, "__llm_logo_reasoning": { "selectedIndex": 5, "reasoning": "Selected #0 because it is located in the header, links to the homepage, and matches the brand name 'LangChain'.", "confidence": 0.9, "source": "llm" }, "__llm_button_reasoning": { "primary": { "index": 0, "text": "Start building", "reasoning": "Button #0 'Start building' is likely the primary CTA due to its action-oriented text and vibrant blue background, which aligns with the brand's accent color." }, "secondary": { "index": 2, "text": "Get a demo", "reasoning": "Button #2 'Get a demo' is chosen as secondary due to its contrasting dark background, making it distinct from the primary button's color group." }, "confidence": 0.9 }, "personality": { "tone": "modern", "energy": "medium", "targetAudience": "tech professionals and AI developers" }, "designSystem": { "framework": "custom", "componentLibrary": "" }, "confidence": { "buttons": 0.9, "colors": 0.95, "overall": 0.925 }, "__llm_metadata": { "logoSelection": { "llmCalled": true, "llmSucceeded": true, "finalSource": "llm", "rawLogoSelection": { "selectedLogoIndex": 0, "selectedLogoReasoning": "Selected #0 because it is located in the header, links to the homepage, and matches the brand name 'LangChain'.", "confidence": 0.9 } }, "buttonClassification": { "llmCalled": true, "llmSucceeded": true } } }, "images": [ { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/langchain/aef6a26d44.webp", "alt": "Use time-travel - Docs by LangChain", "source_url": "https://docs.langchain.com/oss/javascript/langgraph/use-time-travel", "image_url": "https://mintcdn.com/langchain-5e9cc07a/-_xGPoyjhyiDWTPJ/oss/images/checkpoints_full_story.jpg?fit=max&auto=format&n=-_xGPoyjhyiDWTPJ&q=85&s=a52016b2c44b57bd395d6e1eac47aa36", "width": 3705, "height": 2598, "bytes": 425781, "query": "site:langchain.com/?ref=startups.gallery", "query_suffix": "site:langchain.com/?ref=startups.gallery" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/langchain/62525b7957.webp", "alt": "Deconstructing RAG", "source_url": "https://www.langchain.com/blog/deconstructing-rag", "image_url": "https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69cbb0a5504e43f62959ea53_blog_figure.jpeg", "width": 1424, "height": 802, "bytes": 69276, "query": "site:langchain.com/?ref=startups.gallery blog", "query_suffix": "site:langchain.com/?ref=startups.gallery blog" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/langchain/d0f3642683.webp", "alt": "LangChain Events: AI Conferences, Meetups & Webinars", "source_url": "https://www.langchain.com/events", "image_url": "https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69e908a3b281029c331b60fb_1d7f96a9-a23b-4316-9fa3-749a7d3227bc.png", "width": 3000, "height": 3000, "bytes": 976117, "query": "site:langchain.com/?ref=startups.gallery", "query_suffix": "site:langchain.com/?ref=startups.gallery" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/langchain/90487d6355.webp", "alt": "Open Source Extraction Service", "source_url": "https://www.langchain.com/blog/open-source-extraction-service", "image_url": "https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69cbaffcf3571add5bca9ff6_Extraction_blog-1.png", "width": 990, "height": 742, "bytes": 382786, "query": "site:langchain.com/?ref=startups.gallery blog", "query_suffix": "site:langchain.com/?ref=startups.gallery blog" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/langchain/730784ab58.webp", "alt": "Agent Observability: How to Monitor and Evaluate LLM Agents in Production", "source_url": "https://www.langchain.com/blog/production-monitoring", "image_url": "https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69e9d0c071ff058cd3f01213_699f6ae5c8fe8bec5769419d_Production%2520Monitoring%2520cycle.png", "width": 3514, "height": 2456, "bytes": 178408, "query": "site:langchain.com/?ref=startups.gallery", "query_suffix": "site:langchain.com/?ref=startups.gallery" }, { "file": "https://e4p9rs3sldnmtboz.public.blob.vercel-storage.com/langchain/05374db1f4.webp", "alt": "LangChain Blog", "source_url": "https://www.langchain.com/blog", "image_url": "https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69e251cee3c69c0b64e26c79_case-study-16_9%20(1).png", "width": 990, "height": 557, "bytes": 131384, "query": "site:langchain.com/?ref=startups.gallery blog", "query_suffix": "site:langchain.com/?ref=startups.gallery blog" } ], "font_resources": [ { "family": "Twklausanne", "google_fonts_url": "https://fonts.google.com/specimen/Twklausanne" }, { "family": "Aeonik", "google_fonts_url": "https://fonts.google.com/specimen/Aeonik" } ], "google_fonts_css": "https://fonts.googleapis.com/css2?family=Twklausanne&family=Aeonik&display=swap", "font_download_note": "Not found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:\n\nCharacterQuilt.com suggests this flow that can help:\n\n1. Open the company's homepage in a browser with DevTools open.\n2. In the Network tab, filter by \"Font\" (or by extension: woff2, woff, ttf, otf).\n3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.\n4. For each captured font URL: right-click → Save As to download the file locally.\n5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.\n\nProgrammatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.\n\nOnly do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.", "page_url": "https://characterquilt.com/branding/langchain", "agent_instructions": "You are designing or implementing in LangChain's brand identity.\n\n# Brand profile\n- Company: LangChain\n- Source: https://www.langchain.com/?ref=startups.gallery\n- Color scheme: dark\n\n# Colors\n- primary: #CCE9FF\n- secondary: #E5F4FF\n- accent: #7FC8FF\n- background: #030710\n- textPrimary: #030710\n- link: #7FC8FF\n\n# Typography\n- primary: Twklausanne — https://fonts.google.com/specimen/Twklausanne\n- heading: Aeonik — https://fonts.google.com/specimen/Aeonik\n\nLoad all fonts at once: \n\n# UI Components\n- input: background=#030710, textColor=#CCE9FF, borderColor=#262C36, borderRadius=6.75px, shadow=none\n- buttonPrimary: background=#E5F4FF, textColor=#030710, borderRadius=6.75px, shadow=none\n- buttonSecondary: background=#030710, textColor=#CCE9FF, borderColor=#2F4B68, borderRadius=6.75px, shadow=none\n\n# Brand voice\n- Tone: modern\n- Energy: medium\n- Audience: tech professionals and AI developers\n\n# Working with these fonts\nNot found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:\n\nCharacterQuilt.com suggests this flow that can help:\n\n1. Open the company's homepage in a browser with DevTools open.\n2. In the Network tab, filter by \"Font\" (or by extension: woff2, woff, ttf, otf).\n3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.\n4. For each captured font URL: right-click → Save As to download the file locally.\n5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.\n\nProgrammatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.\n\nOnly do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.\n\n# Full machine-readable profile\nhttps://characterquilt.com/branding/langchain.json", "page_markdown": "# LangChain Brand Identity\n\nA complete profile of **LangChain**'s visual system — colors, typography, components, and personality — extracted from https://www.langchain.com/?ref=startups.gallery. Built for designers, agents, and AI tools.\n\n- Page: https://characterquilt.com/branding/langchain\n- Machine-readable JSON: https://characterquilt.com/branding/langchain.json\n- Per-page llms.txt: https://characterquilt.com/branding/langchain/llms.txt\n\n## Quick Facts\n\n| Field | Value |\n|---|---|\n| Primary | #CCE9FF |\n| Accent | #7FC8FF |\n| Body Font | Twklausanne |\n| Heading Font | Aeonik |\n\n## Color Palette\n\n- primary: #CCE9FF\n- secondary: #E5F4FF\n- accent: #7FC8FF\n- background: #030710\n- textPrimary: #030710\n- link: #7FC8FF\n\n## Typography\n\n- primary: Twklausanne — https://fonts.google.com/specimen/Twklausanne\n- heading: Aeonik — https://fonts.google.com/specimen/Aeonik\n\n## Visual Assets\n\n- Logo: data:image/svg+xml;utf8,%3Csvg%20width%3D%22100%25%22%20height%3D%22100%25%22%20viewBox%3D%220%200%20131%2024%22%20fill%3D%22none%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20data-fc-idx%3D%220%22%3E%0A%3Cg%20clip-path%3D%22url(%23clip0_4783_495)%22%20style%3D%22fill%3A%20none%20!important%3B%22%3E%0A%3Cpath%20d%3D%22M69.3795%209.85744H69.3579C68.9576%208.92431%2067.8011%207.92334%2065.8885%207.92334C62.7764%207.92334%2060.5527%2010.1023%2060.5527%2013.7488C60.5527%2017.3953%2062.7979%2019.6189%2065.91%2019.6189C67.8888%2019.6189%2068.9112%2018.6411%2069.3563%2017.5525H69.3778V18.9307C69.3778%2020.8879%2068.3768%2021.8211%2066.5767%2021.8211C65.0645%2021.8211%2064.0652%2021.2867%2063.7988%2020.0425H60.9978C61.3088%2022.3108%2063.4001%2024%2066.6231%2024C69.669%2024%2072.3807%2022.4647%2072.3807%2018.5303V8.23438H69.3811V9.85744H69.3795ZM66.5321%2017.3738C64.464%2017.3738%2063.4183%2015.6614%2063.4183%2013.772C63.4183%2011.8825%2064.4855%2010.1933%2066.5321%2010.1933C68.5787%2010.1933%2069.6442%2012.1274%2069.6442%2013.772C69.6442%2015.4165%2068.7987%2017.3738%2066.5321%2017.3738Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M47.2325%2012.7727C47.2325%209.94849%2045.899%207.88037%2042.2955%207.88037C39.2711%207.88037%2037.696%209.86245%2037.3618%2011.7502H40.052C40.3416%2010.6831%2041.187%2010.0163%2042.3203%2010.0163C43.6307%2010.0163%2044.4315%2010.5491%2044.4315%2011.4607C44.4315%2012.4385%2043.72%2012.6619%2042.231%2012.8836C40.6294%2013.1268%2036.8506%2013.4378%2036.8506%2016.5962C36.8506%2018.5303%2038.3628%2020.0425%2040.8743%2020.0425C43.0533%2020.0425%2044.0096%2018.8861%2044.4761%2017.9761H44.4993V18.5535C44.4993%2018.9307%2044.5225%2019.3543%2044.5886%2019.7315H47.4559C47.2987%2018.9969%2047.2342%2017.8189%2047.2342%2016.9304V12.7727H47.2325ZM44.4761%2014.3974C44.4761%2017.0661%2043.1211%2017.9314%2041.6536%2017.9314C40.3647%2017.9314%2039.6963%2017.3308%2039.6963%2016.4639C39.6963%2015.5969%2040.3862%2015.1304%2041.92%2014.8177C43.6092%2014.4851%2044.2098%2013.9739%2044.4761%2013.418V14.3958V14.3974Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M55.2815%207.9248C53.503%207.9248%2052.4821%208.87945%2051.8352%2010.2146V8.23585H49.0342V19.7313H51.9014V14.5726C51.9014%2011.7715%2052.9471%2010.4148%2054.4808%2010.4148C56.127%2010.4148%2056.5704%2011.7268%2056.5704%2013.3946V19.7313H59.4161V12.7046C59.4161%209.88207%2058.2596%207.9248%2055.2799%207.9248H55.2815Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M81.9947%206.10158C84.1505%206.10158%2085.618%206.96853%2086.4634%208.83645H89.3985C88.4207%205.59034%2085.9737%203.56689%2081.9947%203.56689C77.1702%203.56689%2073.9009%206.99335%2073.9009%2011.8162C73.9009%2016.639%2077.147%2020.0208%2081.9715%2020.0192C85.9075%2020.0192%2088.5977%2017.908%2089.3985%2014.7496H86.4419C85.7967%2016.4388%2084.4185%2017.4845%2081.9947%2017.4845C78.9256%2017.4845%2076.8806%2015.0838%2076.8806%2011.8162C76.8806%208.54857%2078.9041%206.10323%2081.9947%206.10323V6.10158Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M125.996%207.9248C124.217%207.9248%20123.196%208.87945%20122.55%2010.2146V8.23585H119.749V19.7313H122.616V14.5726C122.616%2011.7715%20123.661%2010.4148%20125.195%2010.4148C126.84%2010.4148%20127.285%2011.7268%20127.285%2013.3946V19.7313H130.13V12.7046C130.13%209.88207%20128.974%207.9248%20125.994%207.9248H125.996Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M117.814%204.84424H114.858V7.51294H117.814V4.84424Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M114.903%2010.2264V19.7298H117.77V8.23438H116.893C115.793%208.23438%20114.903%209.12615%20114.903%2010.2264Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M97.2693%207.92172C95.4908%207.92172%2094.4699%208.87802%2093.823%2010.19V3.85498H91.022V19.7265H93.8892V14.5678C93.8892%2011.7668%2094.9349%2010.4101%2096.4686%2010.4101C98.1148%2010.4101%2098.5582%2011.7221%2098.5582%2013.3898V19.7265H101.404V12.6999C101.404%209.87733%20100.247%207.92007%2097.2677%207.92007L97.2693%207.92172Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M113.035%2012.7727C113.035%209.94849%20111.701%207.88037%20108.098%207.88037C105.073%207.88037%20103.498%209.86245%20103.166%2011.7502H105.856C106.145%2010.6831%20106.991%2010.0163%20108.124%2010.0163C109.434%2010.0163%20110.235%2010.5491%20110.235%2011.4607C110.235%2012.4385%20109.524%2012.6619%20108.035%2012.8836C106.433%2013.1268%20102.654%2013.4378%20102.654%2016.5962C102.654%2018.5303%20104.167%2020.0425%20106.678%2020.0425C108.857%2020.0425%20109.813%2018.8861%20110.28%2017.9761H110.301V18.5535C110.301%2018.9307%20110.323%2019.3543%20110.391%2019.7315H113.258C113.102%2018.9969%20113.036%2017.8189%20113.036%2016.9304V12.7727H113.035ZM110.277%2014.3974C110.277%2017.0661%20108.922%2017.9314%20107.454%2017.9314C106.165%2017.9314%20105.497%2017.3308%20105.497%2016.4639C105.497%2015.5969%20106.187%2015.1304%20107.72%2014.8177C109.41%2014.4851%20110.01%2013.9739%20110.277%2013.418V14.3958V14.3974Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M28.525%2014.4586V3.85498H25.6445V16.4589H26.5247C27.6299%2016.4589%2028.525%2015.5638%2028.525%2014.4586Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M35.9537%2017.1851H25.6445V19.7313H35.9537V17.1851Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3C%2Fg%3E%0A%3Cg%20clip-path%3D%22url(%23clip1_4783_495)%22%20style%3D%22fill%3A%20none%20!important%3B%22%3E%0A%3Cpath%20d%3D%22M6.64803%2014.103C7.89438%2012.8566%208.595%2011.1643%208.595%209.40177C8.595%207.63928%207.89378%205.94697%206.64803%204.70058L1.94697%200C0.701225%201.24639%200%202.9387%200%204.70119C0%206.46368%200.701225%208.15599%201.94697%209.40238L6.64742%2014.103H6.64803Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M16.4845%2014.5379C15.2388%2013.2921%2013.5459%2012.5908%2011.7841%2012.5908C10.0222%2012.5908%208.32936%2013.2921%207.08301%2014.5379L11.7841%2019.239C13.0298%2020.4848%2014.7227%2021.1861%2016.4851%2021.1861C18.2476%2021.1861%2019.9398%2020.4848%2021.1862%2019.239L16.4851%2014.5379H16.4845Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M1.95832%2019.228C3.20468%2020.4738%204.89693%2021.1751%206.65938%2021.1751V14.5269H0.0107422C0.0113472%2016.2893%200.711968%2017.9817%201.95832%2019.228Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3Cpath%20d%3D%22M18.2997%207.58717C17.0533%206.34138%2015.3611%205.63953%2013.598%205.64014C11.8356%205.64014%2010.1433%206.34138%208.89697%207.58777L13.598%2012.289L18.2997%207.58717Z%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3C%2Fg%3E%0A%3Cdefs%20style%3D%22fill%3A%20none%20!important%3B%22%3E%0A%3CclipPath%20id%3D%22clip0_4783_495%22%20style%3D%22fill%3A%20none%20!important%3B%22%3E%0A%3Crect%20width%3D%22104.488%22%20height%3D%2220.433%22%20fill%3D%22currentColor%22%20transform%3D%22translate(25.6445%203.56689)%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3C%2FclipPath%3E%0A%3CclipPath%20id%3D%22clip1_4783_495%22%20style%3D%22fill%3A%20none%20!important%3B%22%3E%0A%3Crect%20width%3D%2221.1862%22%20height%3D%2221.1862%22%20fill%3D%22currentColor%22%20style%3D%22fill%3A%20rgb(255%2C%20255%2C%20255)%20!important%3B%22%2F%3E%0A%3C%2FclipPath%3E%0A%3C%2Fdefs%3E%0A%3C%2Fsvg%3E\n- Favicon: https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a17e4a429d54e956e2a763_favicon.png\n- Social card (og:image): https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a1e9409d6b1c287c69da0d_Website%20preview.png\n\n## UI Components\n\n- input: background=#030710, textColor=#CCE9FF, borderColor=#262C36, borderRadius=6.75px, shadow=none\n- buttonPrimary: background=#E5F4FF, textColor=#030710, borderRadius=6.75px, shadow=none\n- buttonSecondary: background=#030710, textColor=#CCE9FF, borderColor=#2F4B68, borderRadius=6.75px, shadow=none\n\n## Brand Personality\n\nTone: modern · Energy: medium · Audience: tech professionals and AI developers\n\n## LangChain Brand in the Wild\n\nReal-world brand assets — ads, campaigns, marketing materials.\n\n- **Use time-travel - Docs by LangChain**\n - Image: https://mintcdn.com/langchain-5e9cc07a/-_xGPoyjhyiDWTPJ/oss/images/checkpoints_full_story.jpg?fit=max&auto=format&n=-_xGPoyjhyiDWTPJ&q=85&s=a52016b2c44b57bd395d6e1eac47aa36\n - Source: https://docs.langchain.com/oss/javascript/langgraph/use-time-travel\n- **Deconstructing RAG**\n - Image: https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69cbb0a5504e43f62959ea53_blog_figure.jpeg\n - Source: https://www.langchain.com/blog/deconstructing-rag\n- **LangChain Events: AI Conferences, Meetups & Webinars**\n - Image: https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69e908a3b281029c331b60fb_1d7f96a9-a23b-4316-9fa3-749a7d3227bc.png\n - Source: https://www.langchain.com/events\n- **Open Source Extraction Service**\n - Image: https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69cbaffcf3571add5bca9ff6_Extraction_blog-1.png\n - Source: https://www.langchain.com/blog/open-source-extraction-service\n- **Agent Observability: How to Monitor and Evaluate LLM Agents in Production**\n - Image: https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69e9d0c071ff058cd3f01213_699f6ae5c8fe8bec5769419d_Production%2520Monitoring%2520cycle.png\n - Source: https://www.langchain.com/blog/production-monitoring\n- **LangChain Blog**\n - Image: https://cdn.prod.website-files.com/65c81e88c254bb0f97633a71/69e251cee3c69c0b64e26c79_case-study-16_9%20(1).png\n - Source: https://www.langchain.com/blog\n\n## Working with these fonts\n\nNot found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:\n\nCharacterQuilt.com suggests this flow that can help:\n\n1. Open the company's homepage in a browser with DevTools open.\n2. In the Network tab, filter by \"Font\" (or by extension: woff2, woff, ttf, otf).\n3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.\n4. For each captured font URL: right-click → Save As to download the file locally.\n5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.\n\nProgrammatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.\n\nOnly do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.\n\n## Machine-Readable Profile\n\n```json\n{\n \"colorScheme\": \"dark\",\n \"fonts\": [\n {\n \"family\": \"Aeonik\",\n \"role\": \"heading\"\n },\n {\n \"family\": \"Twklausanne\",\n \"role\": \"body\"\n }\n ],\n \"colors\": {\n \"primary\": \"#CCE9FF\",\n \"secondary\": \"#E5F4FF\",\n \"accent\": \"#7FC8FF\",\n \"background\": \"#030710\",\n \"textPrimary\": \"#030710\",\n \"link\": \"#7FC8FF\"\n },\n \"typography\": {\n \"fontFamilies\": {\n \"primary\": \"Twklausanne\",\n \"heading\": \"Aeonik\"\n },\n \"fontStacks\": {\n \"heading\": [\n \"Twklausanne\",\n \"Tahoma\",\n \"sans-serif\"\n ],\n \"body\": [\n \"Aeonik\",\n \"Tahoma\",\n \"sans-serif\"\n ],\n \"paragraph\": [\n \"Aeonik\",\n \"Tahoma\",\n \"sans-serif\"\n ]\n },\n \"fontSizes\": {\n \"h1\": \"68.4px\",\n \"h2\": \"54px\",\n \"body\": \"20.25px\"\n }\n },\n \"spacing\": {\n \"baseUnit\": 4,\n \"borderRadius\": \"18px\"\n },\n \"components\": {\n \"input\": {\n \"background\": \"#030710\",\n \"textColor\": \"#CCE9FF\",\n \"borderColor\": \"#262C36\",\n \"borderRadius\": \"6.75px\",\n \"borderRadiusCorners\": {\n \"topLeft\": \"6.75px\",\n \"topRight\": \"6.75px\",\n \"bottomRight\": \"6.75px\",\n \"bottomLeft\": \"6.75px\"\n },\n \"shadow\": \"none\"\n },\n \"buttonPrimary\": {\n \"background\": \"#E5F4FF\",\n \"textColor\": \"#030710\",\n \"borderRadius\": \"6.75px\",\n \"borderRadiusCorners\": {\n \"topLeft\": \"6.75px\",\n \"topRight\": \"6.75px\",\n \"bottomRight\": \"6.75px\",\n \"bottomLeft\": \"6.75px\"\n },\n \"shadow\": \"none\"\n },\n \"buttonSecondary\": {\n \"background\": \"#030710\",\n \"textColor\": \"#CCE9FF\",\n \"borderColor\": \"#2F4B68\",\n \"borderRadius\": \"6.75px\",\n \"borderRadiusCorners\": {\n \"topLeft\": \"6.75px\",\n \"topRight\": \"6.75px\",\n \"bottomRight\": \"6.75px\",\n \"bottomLeft\": \"6.75px\"\n },\n \"shadow\": \"none\"\n }\n },\n \"images\": {\n \"logo\": 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\"favicon\": \"https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a17e4a429d54e956e2a763_favicon.png\",\n \"ogImage\": \"https://cdn.prod.website-files.com/65b8cd72835ceeacd4449a53/69a1e9409d6b1c287c69da0d_Website%20preview.png\",\n \"logoHref\": \"/\"\n },\n \"__llm_logo_reasoning\": {\n \"selectedIndex\": 5,\n \"reasoning\": \"Selected #0 because it is located in the header, links to the homepage, and matches the brand name 'LangChain'.\",\n \"confidence\": 0.9,\n \"source\": \"llm\"\n },\n \"__llm_button_reasoning\": {\n \"primary\": {\n \"index\": 0,\n \"text\": \"Start building\",\n \"reasoning\": \"Button #0 'Start building' is likely the primary CTA due to its action-oriented text and vibrant blue background, which aligns with the brand's accent color.\"\n },\n \"secondary\": {\n \"index\": 2,\n \"text\": \"Get a demo\",\n \"reasoning\": \"Button #2 'Get a demo' is chosen as secondary due to its contrasting dark background, making it distinct from the primary button's color group.\"\n },\n \"confidence\": 0.9\n },\n \"personality\": {\n \"tone\": \"modern\",\n \"energy\": \"medium\",\n \"targetAudience\": \"tech professionals and AI developers\"\n },\n \"designSystem\": {\n \"framework\": \"custom\",\n \"componentLibrary\": \"\"\n },\n \"confidence\": {\n \"buttons\": 0.9,\n \"colors\": 0.95,\n \"overall\": 0.925\n },\n \"__llm_metadata\": {\n \"logoSelection\": {\n \"llmCalled\": true,\n \"llmSucceeded\": true,\n \"finalSource\": \"llm\",\n \"rawLogoSelection\": {\n \"selectedLogoIndex\": 0,\n \"selectedLogoReasoning\": \"Selected #0 because it is located in the header, links to the homepage, and matches the brand name 'LangChain'.\",\n \"confidence\": 0.9\n }\n },\n \"buttonClassification\": {\n \"llmCalled\": true,\n \"llmSucceeded\": true\n }\n }\n}\n```\n" }