dark · light · bright · cool · multi-theme · mono · serif · minimal
AgentKit
Three swappable themes for AI agent products — editorial dark, daylight bright, fintech cool-blue.
By webdesignhot · agentkit.webdesignhot.com
$ npx design-md add agentkit
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Adidas Pure-black sport-utility, AdihausDIN/adidasFG uppercase, three-stripe geometry — the engineering canon for global sportswear. Adobe Creative-suite chrome — paper-white canvas, magenta-to-orange wordmark gradient, and Adobe Clean carrying every product grid. Airbnb Pure-white marketplace canvas with one Rausch coral and Cereal — generous photography, soft pills, modest type. Airtable White-canvas editorial workflow software with full-bleed coral and forest signature cards punctuating a near-black pill-CTA system. Alibaba Electric orange `#ff6a00` + dense merchant grids — the global B2B wholesale floor as a website. Amazon Smile-orange CTA, Amazon Ember sans, dense product grids — the canonical everything-store interface. Amazon Web Services Squid-ink navy with Smile-orange CTAs — the densest tile-portal on the cloud-platform internet. Anthropic Editorial broadsheet for AI safety — cream canvas, Anthropic Serif body, terracotta clay accent, magazine geometry. Apple White-canvas product theatre — SF Pro Text, 980px pill CTAs, and a single-blue accent system. Apple Music Pink-red gradient hero with album-grid kinesthetics — SF Pro precision, signature `#fa233b` brand pink, glassy dark canvas. Apple TV+ Pure-black cinematic theatre with SF Pro and ruthless minimalism — content as the only voice. Arc Browser-as-personality marketing — buttery cream canvas, Marlin Soft display, hand-tooled blue-and-coral palette. Are.na Bare grey-and-orange minimalism — a single Helvetica-class sans, hairline borders, and a stubborn refusal to optimise for engagement. Asana Approachable work management in soft purple — Asana Sans at modest weights with a rainbow accent palette and warm sky-tinted whitespace. Astro Cosmos navy canvas with violet-to-orange brand gradient — Mona Sans display, Inter body, Astro''s star-chart MPA framework dressed as an observatory dashboard. ASUS Republic of Gamers red `#cd0000` on black with bold sans — Taiwan engineering meets esports brutalism. Audi Vorsprung durch Technik on near-black — Audi Type sans, four-rings precision, and a near-monochrome canvas with `#bb0a30` reserved for sport. Auth0 Twilight-blue dark canvas with TWK Lausanne 300 display + Aeonik body — the original identity-platform aesthetic. Axiom Deep-navy observability with a cyan electric accent — Inter for body, JetBrains Mono for every event label, and a structural grid that reads as logs at planet scale. Axios Smart-brevity in chromatic form — blocky white canvas, Tiempos-flavored Atiza serif, signature `Why it matters:` time-bars and bullet-first prose. Base Coinbase-adjacent L2 minimalism — coinbaseSans on white, signature electric blue Baseten White canvas with Inter and a signature `#6c5ce7` purple — ML model deployment dressed in approachable workshop chrome. BBC News Signature BBC red (`#bb1919`), Reith Sans + Reith Serif, the global broadcaster authority typography of the world''s public-service news. Bear Off-white canvas, a custom bearsans display, a red bear icon, and tealish handwritten underlines — a Markdown notes app dressed as a Mac Pro magazine. beehiiv Aggressive black-on-yellow newsletter punch — heavy display sans, hyper-flat cards, and a `#ffd60a` highway-yellow that reads like a tabloid front page. Binance Trading-floor near-black with a single high-voltage Binance Yellow doing all the brand work — BinanceNova for type, BinancePlex for numbers. Bloomberg Iconic black-orange financial broadsheet — BWHaasHead headlines, AvenirNextPForBBG chrome, terminal-grade data density. Bluesky Sky-blue `#0085ff` on bright white with Inter sans — the AT-Protocol social network rendered as airy, federated, open. Blur Pure-black canvas, neon `#ff8700` orange voltage, and JetBrains-Mono-default everywhere — brutalist NFT trader terminal as competitive instrument. BMW Corporate-blue calm — BMW Type Next on a cream-tinted white, dark navy hero bands, and the M-stripe triplet in reserve. BMW M Performance black on M-blue/M-violet/M-red — the motorsport variant that turns BMW corporate into track-day theatre. Booking.com Deep-blue commerce engine — Bookin Sans on white, yellow CTA voltage, dense booking-funnel maximalism. Bose Pure black canvas, Helvetica restraint, and premium-audio confidence — sound presented as engineering art. Brex Cool grey-blue surfaces, magenta-to-purple-to-indigo gradient, Söhne 600 — fintech as fast, modern, slightly flashy. Bugatti French-engineered austerity — pure black canvas, three Bugatti typefaces, and full-bleed photography as the only voltage. Bun Cream canvas with chunky pink accents and the wide-eyed mascot — a JS runtime dressed as a 1970s bakery sign. Cal.com Open-source calendly with one bold custom font — Cal Sans on a soft `#f4f4f4` paper canvas. Calm Signature `#0066ff` deep blue + Aktiv Grotesk + meditation-deep cool atmospheric calm. Capacities Cream-yellow canvas, Inter at 700 with a Crimson Pro serif fallback, and a yellow underline as page ornament — a PKM that thinks like a sketchbook. Cartesia Bright clinical white with a single deep-blue action — voice-AI presented as scientific instrument rather than consumer product. Cash App Electric `#00d54b` green on near-black, Cash Sans monospace-flavoured geometry, and p2p-money youth aesthetic. Character.AI Cool zinc canvas, custom atHauss sans, and dark pill CTAs — a roleplay social product dressed in TikTok-grade neutrality. Chevrolet Gold-cross American classic — Louis sans on white with a `#cd9834` bowtie, a `#003876` corporate blue, and Camaro/Corvette red drama in reserve. Claude.ai Cream paper canvas, Anthropic Sans for body and Anthropic Serif for the headline — an AI assistant set in literary type. Clerk Geist + Suisse on near-black canvas with `#6c47ff` violet CTA — the drop-in-auth dev-tool aesthetic. ClickHouse Near-pure black canvas with electric yellow as the brand voltage — database performance dressed in voltmeter chrome. Cloudinary Media-API technical infrastructure in confident blue — Inter at modest weights with a deep navy-blue brand and a single chromatic accent for media moments. Cohere Stark white editorial canvas with deep green-black product bands and a CohereText/Unica77 type split. Coinbase Institutional-grade calm — pure white canvas, a single Coinbase Blue, and Coinbase Display set at weight 400 instead of 700. Composio Near-black canvas with deep-electric-blue voltage and a 2x2 terminal-mockup hero — agent infrastructure dressed as developer instrumentation. Corsair Yellow `#ffff00` lightning on black with Roboto — RGB-everything peripherals and PC components. Costco Warehouse blue + signature red, Helvetica utilitarian — bulk-buying signage translated to web. Coursera University-blue `#0056d2` on warm-white parchment with Source Sans — the canonical online-degree marketplace. Cursor Warm cream IDE-marketing — `#f7f7f4` canvas, `#26251e` ink, custom CursorGothic display, JetBrains Mono code, vivid orange accent. Datadog NationalWeb on white with the iconic `#632ca6` purple — observability dressed as an enterprise dashboard, structurally dense, chromatically restrained, multicolour where the data demands it. Deel A warm dark canvas with electric coral and orange accents — global payroll dressed as a confident product portrait. DeepSeek Deep-blue Chinese-tech minimalism — a research lab dressed in `#4d6bfe` and stark white space. Dell Pragmatic blue `#007db8` with custom Roboto-derivative — business-first PC commerce since the dorm room. Deno Inkwell black on warm white with the dinosaur mascot — TypeScript runtime as Eric Carle children's book. Descript Cream-pink canvas, a custom Brett display serif, and a wine-dark CTA — an AI video editor that ships like a magazine. Discord Indigo-ground hangout — gg sans body, ABC Ginto Nord display, 12-16px tile radii, white pill CTAs. Disney+ Deep navy gradient streaming hall with custom Inspire display sans and the unmistakable Disney+ wordmark arc. DoorDash Signature red-orange CTA, custom DoorDash Sans, delivery-funnel commerce — the dominant on-demand local marketplace. ElevenLabs Near-black voice-tech ground with white voice-wave aesthetic — Inter at studio scale, pill CTAs, and a single saturated accent that reads as both wayfinding and brand. Epic Games Pure-black canvas with custom Brutal Type / Heading Now display — Fortnite-saturated marketing meets PC-storefront merchandising. Ethereum Off-white canvas, ethereum-blue `#1c64f2` voltage, and Inter + serif duet — community-owned protocol as open documentation. Etsy Burnt-orange CTA, Graphik humanist sans, handcrafted-warmth aesthetic — the marketplace for makers and small batch. Excalidraw Literal hand-drawn whiteboard — wobbly SVG strokes, Virgil-style handwriting, and a deliberately primitive UI that turns digital sketching into nostalgia. Expedia Navy commerce + Mango yellow voltage — Expedia Sans, dense travel-funnel density with One Key loyalty colour-coding. Fantastical White paper, Effra geometric sans, full-round blue pills, and a rainbow of app-icon glass squares — a calendar app marketed like Apple''s Pro Apps. Ferrari Cinematic editorial in near-black — Rosso Corsa restraint, FerrariSans 500, and full-bleed cavallino photography. Figma Bright multi-color section bands with figmaSans display and figmaMono eyebrows — a marketing site that designs in scenes. Financial Times Salmon-pink page (`#fff1e5`) — the world''s most recognizable newspaper background, paired with Financier display + MetricWeb sans for global markets coverage. Fireworks AI Light canvas with Inter sans and a signature `#6720ff` purple-amber-orange spark — fast-inference platform dressed in speed-of-light kinetic chrome. Fly.io Mackinac display + Fragment Mono on a violet-saturated canvas — a PaaS that dresses like a small-press magazine. Ford American-truck heritage in corporate blue — Antenna sans, oval-script wordmark, and a deep `#003478` voltage that has carried the brand since 1927. Framer Black-on-white maximalism with electric gradient floods — Inter Display at heroic sizes, motion as a first-class material. Frontegg PP Neue Machina display + Neue Montreal body — plug-and-play user-management with deep-blue gravitas. Gemini (Google) Blue-into-violet gradient, Google Sans, soft Material 3 surfaces — Google''s house style applied to a chat interface. Ghost Warm-cream content CMS aesthetic — Inter for chrome, a soft serif for the writing surface, and a single confident green for action. GitHub Dark-canvas developer-platform marketing — Mona Sans variable headings, lime-green accent, near-black ground. GitHub Copilot Pure-white canvas, pure-black inverted CTAs, Mona Sans display — GitHub's editorial confidence applied to AI tooling. Grafana Dark observability canvas with the iconic `#f46800` orange — Inter for body, Roboto Mono everywhere a label hides, multi-colour chart palette ripped straight from a real dashboard. Granola White paper, a custom Quadrant book serif, and an olive-green CTA — an AI notepad that dresses like a stationery shop. Grubhub Friendly red-orange CTA, Sentinel display + Avenir body, dense delivery-app commerce — the long-running incumbent. HashiCorp Black canvas hosting a per-product color portfolio — Terraform purple, Vault yellow, Consul red, Waypoint cyan — multi-product identity made literal. Hashnode Developer publishing platform — deep navy canvas, electric blue brand, Inter sans + JetBrains Mono code chrome. HBO Max Deep purple-black premium streaming canvas with custom Sharp Grotesk and the unmistakable Max wordmark. Headspace Signature `#ffac1d` orange + custom round display + meditation-friendly playful warmth. Height AI-PM workspace dressed in chalk pastels — Inter at modest weights over a near-paper canvas, with a single confident accent and an AI-purple voltage moment. Honda Reliability-first restraint — HondaGlobalFont on white, signature red HP Cyan-blue `#0096d6` HP-circle on white with Forma DJR — the 84-year-old technology brand''s mainstream face. Hugging Face AI community canvas — deep blue-black ground, Source Sans Pro headlines, pill auth + 8px tile cards. Hulu Near-black canvas anchored on Hulu Green `#1ce783` with Graphik sans — the bright, cable-meets-streaming UI. IBM Carbon Design System made literal — pure-white canvas, IBM Plex Sans at light 300, square corners, and one assertive `#0f62fe` blue. Ideogram A bright white canvas with a single saturated violet cue — a typography-first AI image tool that lets the gallery do all the talking. Instacart Grocery-shopping-list practical — Instacart Sans on white, signature carrot green Kagi A premium search engine dressed in warm cream and Plex — the indie answer to ad-funded search. KAYAK Burnt-orange flight-search density — Open Sans on white, comparison-engine maximalism, price-graph data viz. Khan Academy Signature `#14bf96` mint green on white with Lato sans — free-for-everyone education in a warm, encouraging register. Kinde White canvas with Inter 72/500 display + dev-friendly pink-coral accent — the approachable auth-billing-access platform. Kit A cream newsletter canvas with a custom KitSans display, a Libre Franklin secondary, and a pastel-rainbow chip set — the editorial register reborn from ConvertKit. Kraken Kraken Purple `#7132f5` on white — Kraken-Brand display + Kraken-Product UI for a calmer, less-bombastic crypto exchange. Krea A pure-black studio with Suisse Intl set quietly at 60px — a creative-AI gallery that lets the work and the cobalt CTA carry the colour. Lamborghini Cathedral of darkness — true black canvas, Lamborghini Gold accents, and LamboType angled-terminal display. LangChain Deep navy canvas with Inter precision and a quietly confident teal accent — agent orchestration dressed as engineering documentation. Linear Dark-canvas product surface — pure-black ground, indigo accent, custom Inter weights, pill CTAs. LiveKit Realtime audio-video infra — Public Sans 300 weight on near-black, signature cyan LlamaIndex White canvas with Inter and a signature `#1b9aff` blue — RAG infrastructure dressed as a clean technical reference card. Logitech Soft consumer-tech blue gradients with Brown sans — design for the way you work, play, and create. Lovable Pink-into-violet gradient on white — vibe-coding dressed in playful, friendly chromatics. Magic Eden Mint-cream canvas, magenta-mint accent duet, and a custom Foundry display — Solana-native marketplace as boutique gallery. Mailchimp Cavendish-yellow chunkiness — a custom display serif (Cooper Light), the signature `#ffe01b` block, and a brand voice that hugs you while it ships campaigns. Mastercard Cream-canvas editorial fintech, circular-portrait orbits, MarkForMC at 450 weight — institutional-but-warm payments brand. MasterClass Pure-black cinema with custom display serif and editorial reverence — celebrity-instructor learning as a premium streaming product. Medium Editorial reading-first publishing — magazine-grade serif body, GT Super display, signature green-on-white pill CTAs. Mercedes-Benz Three-pointed-star authority — MBCorpo on near-black canvas, silver-blue Mercury A near-pure white canvas with a literary serif headline and a signature mercury-mint accent — banking dressed as a quiet magazine. Meta Optimistic blue (#0467df) on a white corporate canvas — Optimistic Display headlines, generous space, social-platform conglomerate at rest. Microsoft Fluent surfaces — off-white canvas, Segoe UI Variable Display, and a Cortana-blue action color carrying every product. Midjourney A deep cosmic canvas where JetBrains Mono headlines float over a wide-gamut OKLCH rainbow — a research lab dressed as a chapel. MiniMax Stark monochrome canvas broken open by vibrant gradient product cards — coral, magenta, blue, purple as model identity. Mintlify Documentation-platform marketing — pure white canvas, mint-green accent, Inter at tight tracking, near-black pill CTAs. Miro Canary-yellow Mistral Butter-yellow canvas, Arial as a deliberate anti-tech statement, and zero-radius rectangles — French AI as a brutalist art-school manifesto. Modal Serverless GPU infra in lime-green — `#0c0c0c` canvas, electric `#7fee64` accent, custom Modal Mono on every chip and code block. Monday.com Project management in confident red-pink — Poppins display at bold weights with a colorful saturated palette and a playfully energetic visual rhythm. MongoDB Signature MongoDB green Motion AI-calendar productivity in green-and-purple — Inter at modest weights with a green-to-purple voltage gradient signaling the AI scheduler, anchored by a clean white canvas. MSI Dragon-red `#ff0000` on jet black with bold display sans — the Taipei dragon-heritage gaming hardware brand. Mux Video API for developers — Aeonik on light-cream, Rotonto display, JetBrainsMono CTAs, sharp 0px corners. Neon Serverless Postgres dressed in late-night green — a near-black canvas with a single electric mint accent. Netflix Pure-black streaming theatre with signature `#e50914` red and Netflix Sans — the canonical media-tile grid. Nike Pure black, pure white, Helvetica Now — pill CTAs and full-bleed athletic photography on a single soft cloud gray. Notion Off-white canvas with Lyon serif accents and a custom NotionInter — a workspace dressed as a literary magazine. Nuxt Forest-green `#00dc82` glow on a near-black canvas — Vue-flavored warmth dressed for the cosmos. NVIDIA Engineering-grade canvas — pure black hero / paper-white body / one violently saturated `#76b900` green that carries every CTA and corner square. Omnivore Open-source read-it-later — near-white reading canvas, focused emerald-on-paper brand, archival elegance after the Eleven Labs sunset. OpenAI Pure white canvas, OpenAI Sans set in calm 500-weight, and a single black pill for the only action that matters — try ChatGPT. OpenRouter Pure-black canvas with custom display typography and pragmatic mono — LLM-router infrastructure dressed as a terminal billing dashboard. OpenSea Pure-black canvas, electric `#2081e2` blue, and Inter at trader-pro density — the original NFT marketplace as financial terminal. Optimism Pure-white canvas, signature `#ff0420` red voltage, and Inter at confident L2 register — Ethereum rollup as bold optimistic infrastructure. Ory White canvas with Inter 48/400 display + signature deep-navy `#0f172a` CTA — open-source-first identity for technical teams. Oura Pure-black canvas with Inter precision and gold-stamped scores — the premium-ring health-precision aesthetic. Paper Website A literal sheet-of-paper website — single literary serif, off-white sheet canvas, narrow reading columns, ink-blue links. PayPal Dual-blue corporate trust — PayPal Sans Big over white, with a deep-navy ink and a sky-blue counterpoint. Peloton Signature `#cb1e4e` red on midnight ink, Inter display, instructor-led premium-fitness storefront. Perplexity Cream paper canvas, custom pplxSans, and the unmistakable Tropic-cyan accent — a reference-library answer engine dressed in warm tones. Pinecone White canvas with Inter and a signature `#1cb0d0` cyan — vector database technical-marketing dressed in clean blueprint chrome. Plaid Pale blue trust on white, classical Stripe-adjacent type, and a Benjamin-Franklin-as-mascot moment of personality. Plain B2B support tool with a Dinamo grotesk and a single radioactive `#1ad379` action — Linear-restraint applied to support. PlanetScale Pure-black canvas, blood-red accent, mono-set numerals — a database brand styled like a financial terminal. Polar Dev-tool obsidian — 8rem editorial display headlines, indigo accents, Louize serif moments. Polygon Deep purple `#8247e5` voltage, soft surface ladder, and Inter at enterprise calm — Ethereum L2 as institutional infrastructure. Porsche Engineering-purity black-on-white — Porsche Next at 96px regular, Rosso PostHog Cream-canvas analytics with mustard-yellow CTAs and IBM Plex — open-source craft, not SaaS gloss. Postmark Postal-yellow #ffde00 + warm-black #1c1d1f + paper-white canvas — the transactional email API designed like a friendly post office sign. Prime Video Amazon-blue streaming canvas with Ember sans and the dense, utility-first marketplace UI vocabulary. PropelAuth White canvas with SF Pro Rounded display 60/900 + deep-navy ink — B2B multi-tenant auth with Apple-tinted polish. Qwik Electric purple-to-blue gradient on near-black — resumable execution dressed as a lightning bolt. Railway Ship software peacefully — IBM Plex Serif headlines on a deep eggplant canvas, with a single confident violet for action. Raindrop.io White paper, system-ui sans, soft watercolor blob backgrounds, and a vivid `#0b7ed0` blue CTA — a bookmark manager that ships like a creative-tool sketch. Ramp Off-yellow `#fcfb70` and black-on-white editorial — finance ops dressed as a printed annual report. Raycast Near-black canvas, glowing keycaps, monospaced shortcut chips — a marketing site that thinks like a launcher. Razer Neon `#44d62c` snake-green on jet black with Roboto — the For Gamers, By Gamers visual signature. Readwise Pastel-orange book-club warmth — soft cream canvas, friendly Tiempos serif accents, and a tangerine that signals 'this is your library.' Reddit Front-page-of-the-internet orange — community-card density, IBM Plex Sans display, and a confident Remix Signature `#3992ff` blue on pure white with Inter — a nested-routes web framework dressed as a manifesto poster. Render Lavender on white — a PaaS that swapped Heroku purple for a candy-bright #8a05ff and kept the airy whitespace. Replicate AI-API marketing — light page chrome, dark hero canvas, rb-Freigeist Neue display, JetBrains Mono code, sharp 0px corners. Replit Saturated turquoise on `#0e1525` ink — the cloud-IDE aesthetic with IBM Plex DNA and a JetBrains Mono soul. Resend Pure-black canvas with Domaine Display serif at 96px and Commit Mono code chips — email infra that thinks in italics. Retool Pragmatic blue #3a55fc + Inter + dense product mocks — the internal-tool platform that designed itself like a well-organised admin panel. Reuters Global newswire restraint — signature orange (`#ff8000`), Knowledge Medium custom sans, broadsheet rigor for the world''s oldest news agency. Riot Games Crimson `#d13639` red on near-black with custom Riot Beam display — esports-tournament drama and competitive-MOBA editorial. Rive Chunky animated display type and saturated playful colour — interactive graphics platform that wears its motion design on its sleeve. Roblox Bright `#ed1d24` red on white with Builder Sans — the youth-block-builder playground turned multi-billion-game social platform. RunPod Deep slate canvas with Inter and a signature `#673ab7` purple — accessible GPU cloud dressed in friendly developer chrome. Runway A near-black research canvas with ABC Normal headlines pulled tight at -2.5px — a film studio, an ML lab, and a brutalist gallery in one shell. Salesforce Cloud-trust dashboards — Salesforce Sans on a sky-blue ground, with Astro the bear standing guard over a dense CRM portal. SAP Enterprise-ERP precision in cobalt — SAP72 sans, signal-blue accents, and a calm white canvas built for trust. Segment Twilio Segment's customer-data-platform canvas — Whitney SSm humanist sans, navy-on-white, single confident `#1866ee` blue. Semafor Paper-cream canvas (`#f8f5d7`) with FeatureFlatHeadline serif and signature flag-style topic columns — global-news editorial built for the post-Twitter era. SendGrid Functional API-blue on white — the email-platform dashboard aesthetic, now folded under the Twilio umbrella. Sentry Deep-aubergine observability — Dammit Sans display, Rubik body, JetBrains Mono code, signature violet #7553ff and pill CTAs. shadcn/ui Copy-paste components in pure black-on-white — the most influential design system not actually shipped as a library. Shopify Dark-first commerce theatre — 96px NeueHaasGrotesk at weight 330, electric mint focus rings, and stacked multi-layer shadows. Signal Privacy-first messaging in `#3a76f0` Signal blue with Inter sans — minimal, ad-free, end-to-end-encrypted by default. Slack Aubergine workspace marketing — Salesforce-Avant-Garde headlines, all-caps 4px CTAs, white canvas with `#4a154b` accents. SolidJS Deep navy with a blue-to-cyan brand gradient — reactive primitives dressed as a circuit diagram. Sonos Pure black canvas, Inter typography, and audio-system minimalism — speakers presented as gallery objects. SoundCloud Signature `#ff5500` orange on `#f2f2f2` paper with Interstate sans — waveform-first audio social UI. SpaceX Pure-black cinematic photography, D-DIN aerospace stencil type, ghost-button minimalism — the interface disappears. Spotify Electric `#1ed760` green on near-black canvas with Spotify Mix sans — the canonical streaming-audio tile grid. Square Pure black on pure white, Square Sans grids, and retail-POS minimalism — commerce as black-and-white geometry. Starbucks Forest-green storefront — SoDoSans, full-pill buttons, warm-cream canvas, and a floating Frap CTA the brand calls home. Steam Deep blue-gray `#1b2838` with Motiva Sans — the utilitarian PC-gaming library that runs the world's largest digital storefront. SteelSeries Esports orange `#ff6900` on near-black with Inter — Danish precision peripherals for competitive play. Strava Signature `#fc4c02` orange + Inter on white — endurance-athlete data-driven storefront with map-overlay heritage. Stripe Editorial fintech polish — light Söhne headlines at weight 300, navy-not-black text, signature `#533afd` purple CTAs. Stytch Paper-cream canvas with Booton display + Chivo Mono body — passwordless-modern auth, joined Twilio. Substack Magazine-on-the-internet — Spectral serif body at 19px, Cahuenga display, signature `#ff6719` orange CTAs. Suno A near-black booth with cream Neue Montreal and a hot-pink cue light — a music studio, a record sleeve, and a chat app fused into one canvas. Sunsama Thoughtful daily planning in warm cream and ink — Inter at modest weights over a paper-cream canvas with sage and rose accents and a calm, unhurried voice. Supabase Off-black canvas, signature emerald `#3ecf8e`, Circular as display, Postgres-grade type discipline. Superhuman White paper canvas, a custom Super Sans variable, and a single confident lavender — premium email dressed as a stationery brand. Supreme Box-logo red, Courier monospace, skate-deadpan minimalism — the most influential streetwear store on the web. Svelte Hot orange #ff3e00 against clean white with a confident sans — the framework that wears its flame as a wordmark. Tailwind CSS The system applied to itself — Inter Variable on white canvas, signature cyan #06b6d4, every component built from Tailwind utilities. Tana Pure black canvas, a custom tanaClassic serif at 83px, and a pale-pistachio CTA — a knowledge graph dressed as a literary supplement. Target Bullseye red CTA, Helvetica Neue, photographic hero — friendly mass-market design with confident chromatic restraint. Telegram Cloud-blue messaging — Tesla Cinematic showroom on white — one Electric Blue CTA, Universal Sans, and viewport-height car photography. The Atlantic Modern serif headlines on cream-paper, signature Atlantic orange `#fbb33b`, long-form magazine reading rendered for the web. The Economist Deep cinnabar red `#e3120b`, Milo serif body, Econ Sans labels — the global-affairs weekly rendered with cover-illustration discipline. The Guardian Guardian Egyptian slab serif, signature navy `#052962`, structured ruled hierarchy with bold section accents. The New York Times Cheltenham serif headlines on paper-white, signature breaking-news red, the canonical American broadsheet rendered for the web. The New Yorker Adobe Caslon Pro + Irvin headline cap — a century of editorial gravitas in cream paper, ink black, and signature cartoon line. The Washington Post Postoni serif blackletter masthead, "Democracy Dies in Darkness" tagline, sober ink-on-paper political broadsheet. Things Cool light-blue canvas, system-ui sans, vivid Things-blue accent — a task manager that ships like an Apple Pro Display. Threads Instagram-adjacent text-first social — pure-black canvas, system-sans clarity, and a quiet brand restraint built from the @ glyph alone. TikTok Electric cyan-magenta on pure black — vertical-video voltage with custom Proxima Nova display and a bold neon brand grammar. tldraw Casual whiteboard sketchy — hand-drawn UI primitives, dotted-grid canvas, and a soft pastel palette that wears its toy-like energy with confidence. Together AI Deep navy on near-white with Inter sans — open-source LLM cloud rendered as developer-platform infrastructure. Toyota Japanese-reliability mainstream — `#eb0a1e` Toyota red on white, ToyotaType sans, and a calm-confident marketing surface for the world's most-sold automotive brand. Turbo Vercel-grade pure-black canvas with a magenta-to-blue Turbo gradient — the build system that wears its speed as a sweep. Turso SQLite at the edge — a deep-teal canvas with a CRT-bright cyan accent (#00face) that reads as a glowing edge node. Twilio Signal-red `#f22f46` against clean white — communications APIs given the visual weight of a broadcast colour. Twitch Purple `#9146ff` on `#0e0e10` canvas with Inter — the live-streaming UI built around chat, raids, and gaming density. Uber Eats Pure-black ground, Uber Move custom sans, Uber-app continuity — the operating system of food delivery. Udemy Signature `#a435f0` purple on white with Sailec sans — the open course-marketplace bazaar made approachable. Uniqlo Signature red `#ff0000`, Helvetica Neue system stack, japanese-utility-functional grid — the LifeWear engine. v0 A near-white prompt canvas with GeistSans and pure OKLCH grayscale — Vercel''s AI builder dressed as the calmest text editor on the internet. Venmo A single confident `#3d95ce` blue, Aktiv Grotesk geometry, and a social-feed informality — payments dressed as group chat. Vercel Brutalist developer-product polish — near-white canvas, near-pure black-on-near-white type, Geist sans + mono, conic-gradient accents. Vite Electric purple #646cff + Manrope display + a literal lightning-bolt mark — the build tool that designed itself to feel as fast as it is. Vodafone Vodafone Red broadcast band, monumental 144px display, two-tier button system — corporate-newsroom telecom design. Volkswagen People's-car blue — the deep `#001e50` corporate hue, custom VW Sans, and a friendly-German marketing surface that sells everyday mobility with confidence. Walmart Spark-yellow on big-box blue, Antonio Display + Bogle sans — everyday low prices made loud. Warp Near-black canvas, neon-lime cursor, real terminal screenshots — a marketing site that boots like a shell. Weaviate White canvas with Inter and a signature `#1cdb46` open-source green — modular vector database dressed in approachable engineering chrome. webdesignhot AI-era editorial dark — pure black with one acid-lime accent. Webflow Indigo-to-purple gradient discipline with a precise structural sans — the visual builder that markets itself like a design conference. WHOOP Lime `#a0d10b` voltage on jet-black, Inter precision, recovery-data athlete-grade aesthetic. WIRED Newsstand-density editorial grid, sharp-corner buttons, mono ALL-CAPS kickers — Conde Nast meets engineering lab. Wise A flexible bright-lime green on cream-white — money that travels in sans-serif and a single confident accent. Workday HR-warm professional in tangerine — Adelle Sans humanist curves, signature `#f37721` orange, and a calm white people-first canvas. WorkOS Pure-white canvas with Untitled Sans 80/500 display + indigo-violet h2 — the B2B-enterprise gravitas aesthetic. X Pure-black canvas with Chirp display — algorithmic minimalism, single-letter wordmark, ruthless type discipline. Y Combinator Brutalist orange monolith — system-font sans on white canvas, signature `#f26625` orange-red blocks with hard 0px corners. You.com Crisp white developer-doc canvas, custom Lumen Sans, and the indigo `#5368EE` accent — a search API rebrand done as enterprise infrastructure. YouTube YouTube Sans + Roboto + signature `#ff0000` red — content-density at planetary scale. Zora Cream-white canvas, electric purple-orange duet, and a custom display — onchain creator network as zine cover.
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theme
mobile · 390 × 844
Tokens design.md/v1.5
theme: editorial-dark
- bg
#0a0a0a - bg-elev
#0f0f0f - bg-card
#141416 - bg-card-hover
#1a1a1c - bg-card-active
#202024 - surface-overlay
rgba(10, 10, 10, 0.72) - text AAA · 16.9
#ededed - text-strong
#ffffff - text-dim AA · 5.7
#8a8a8a - text-faint — · 2.5
#525252 - text-disabled
#3a3a3a - text-on-brand
#0a0a0a - brand AAA · 15.4
#c6f432 - brand-hover
#d2f854 - brand-pressed
#b6e426 - brand-tint
rgba(198, 244, 50, 0.10) - brand-tint-strong
rgba(198, 244, 50, 0.25) - brand-deep
#9bcc1f - border — · 1.2
rgba(255, 255, 255, 0.08) - border-strong — · 1.5
rgba(255, 255, 255, 0.15) - border-subtle
rgba(255, 255, 255, 0.04) - border-brand
rgba(198, 244, 50, 0.25) - border-brand-strong
rgba(198, 244, 50, 0.45) - selection-bg
rgba(198, 244, 50, 0.30) - focus-ring
#c6f432 - link
#c6f432 - link-visited
#9bcc1f - success
#22c55e - warning
#f59e0b - danger
#ef4444 - info
#60a5fa
Ship faster than ever.
display-hero Inter Variable 72px w500 -0.035em
Ship faster than ever.
display-large Inter Variable 56px w500 -0.025em
Ship faster than ever.
h1 Inter Variable 48px w500 -0.03em
Built for teams that ship.
h2 Inter Variable 40px w500 -0.025em
A complete kit
h3 Inter Variable 28px w500 -0.02em
The quick brown fox jumps over the lazy dog.
h4 Inter Variable 22px w500 -0.015em
The quick brown fox jumps over the lazy dog.
h5 Inter Variable 18px w500 -0.01em
The platform your team will actually use — design, code, deploy.
body-lead Inter Variable 17px w400 -0.01em
The quick brown fox jumps over the lazy dog.
body Inter Variable 15px w400 -0.005em
The quick brown fox jumps over the lazy dog.
chat-message Inter Variable 15px w400 -0.005em
The quick brown fox jumps over the lazy dog.
body-small Inter Variable 13px w400 -0.005em
npx design-md add linear
code-block JetBrains Mono Variable 13px w400 0em
OUR DESIGN SYSTEM
caption Inter Variable 12px w400 0em
npx design-md add linear
code-inline JetBrains Mono Variable 12px w400 0em
OUR DESIGN SYSTEM
label-mono JetBrains Mono Variable 11px w500 0.15em
The quick brown fox jumps over the lazy dog.
em-accent Instrument Serif inherit w400
- step-0 0px
- step-1 4px
- step-2 8px
- step-3 12px
- step-4 16px
- step-5 20px
- step-6 24px
- step-7 32px
- step-8 40px
- step-9 48px
- step-10 64px
- step-11 80px
- step-12 96px
- step-13 128px
- step-14 160px
- none
0px - micro
3px - small
6px - standard
8px - comfortable
12px - card
16px - hero
24px - pill
9999px
Text link →
Card preview
A complete kit — everything your product needs.
Hero, pricing, FAQ, dashboard, docs — every layout your product needs.
New
Stable
v1.0
AgentKit extends webdesignhot's editorial-dark canvas into a three-theme system inspired by Vercel's Geist (themed but locked to a single component library) and Linear's spatial restraint. The chat-hero + agent-trace-viewer + tool-call-panel anchor components are the kit's own contribution — there's no reference for "agent product landing page" yet, so the kit defines the genre. The cool-blue theme borrows its palette discipline from Stripe (deep navy + violet accent) for fintech-adjacent products; the bright theme tracks Resend's clean daylight feel. Type system is unchanged across themes — only color swaps — proving that hierarchy comes from size and tracking, not hue.
- Source canvas, type voices, em-as-token rule
- Themed but unified component library pattern
- Spatial restraint, dense agent-product surfaces
- Cool-blue palette discipline (fintech-grade calm)
- Bright theme's daylight clarity
- Editorial calm, mono-with-dot section rhythm
- Italic-serif accents inside display headlines
Export
4 formats · paste-ready
Tailwind
theme.extend block for tailwind.config.js
CSS variables
:root { --bg, --text, --brand, … } you can paste anywhere
DTCG JSON
W3C Design Tokens Community Group format
Figma Variables
Importable into Figma → Variables → Import
---
name: AgentKit
tagline: Three swappable themes for AI agent products — editorial dark, daylight bright, fintech cool-blue.
author: webdesignhot
source_url: https://agentkit.webdesignhot.com
spec: design.md/v1.5
quality: curated
featured: true
categories: [dev-tools, ai]
tags: [dark, light, bright, cool, multi-theme, mono, serif, minimal]
preview_swatch: ['#0a0a0a', '#c6f432', '#06b6d4']
related: [webdesignhot, vercel, linear]
description: 'Landing page kit for AI agent products. Swap between three themes via a single data-theme attribute — same component library renders identically in editorial-dark (acid-lime on near-black), bright (warm-emerald on off-white), and cool-blue (cyan on slate). Anchor components: streaming chat hero, agent trace viewer, tool-call panel.'
lineage:
summary: |
AgentKit extends webdesignhot's editorial-dark canvas into a
three-theme system inspired by Vercel's Geist (themed but locked to a
single component library) and Linear's spatial restraint. The chat-hero
+ agent-trace-viewer + tool-call-panel anchor components are the kit's
own contribution — there's no reference for "agent product landing
page" yet, so the kit defines the genre. The cool-blue theme borrows
its palette discipline from Stripe (deep navy + violet accent) for
fintech-adjacent products; the bright theme tracks Resend's clean
daylight feel. Type system is unchanged across themes — only color
swaps — proving that hierarchy comes from size and tracking, not hue.
influences:
- name: webdesignhot
role: Source canvas, type voices, em-as-token rule
url: https://www.webdesignhot.com
- name: Vercel Geist
role: Themed but unified component library pattern
url: https://vercel.com/geist/introduction
- name: Linear
role: Spatial restraint, dense agent-product surfaces
url: https://linear.app
- name: Stripe
role: Cool-blue palette discipline (fintech-grade calm)
url: https://stripe.com
- name: Resend
role: Bright theme's daylight clarity
url: https://resend.com
- name: Anthropic
role: Editorial calm, mono-with-dot section rhythm
url: https://anthropic.com
- name: Rauno Freiberg
role: Italic-serif accents inside display headlines
url: https://rauno.me
themes:
default: editorial-dark
available: [editorial-dark, bright, cool-blue]
switch-via: 'data-theme attribute on <html>; persisted in localStorage; applied synchronously before paint to prevent FOUC'
colors:
editorial-dark:
bg: '#0a0a0a'
bg-elev: '#0f0f0f'
bg-card: '#141416'
bg-card-hover: '#1a1a1c'
bg-card-active: '#202024'
surface-overlay: 'rgba(10, 10, 10, 0.72)'
text: '#ededed'
text-strong: '#ffffff'
text-dim: '#8a8a8a'
text-faint: '#525252'
text-disabled: '#3a3a3a'
text-on-brand: '#0a0a0a'
brand: '#c6f432'
brand-hover: '#d2f854'
brand-pressed: '#b6e426'
brand-tint: 'rgba(198, 244, 50, 0.10)'
brand-tint-strong: 'rgba(198, 244, 50, 0.25)'
brand-deep: '#9bcc1f'
border: 'rgba(255, 255, 255, 0.08)'
border-strong: 'rgba(255, 255, 255, 0.15)'
border-subtle: 'rgba(255, 255, 255, 0.04)'
border-brand: 'rgba(198, 244, 50, 0.25)'
border-brand-strong: 'rgba(198, 244, 50, 0.45)'
selection-bg: 'rgba(198, 244, 50, 0.30)'
focus-ring: '#c6f432'
link: '#c6f432'
link-visited: '#9bcc1f'
success: '#22c55e'
warning: '#f59e0b'
danger: '#ef4444'
info: '#60a5fa'
bright:
bg: '#fafafa'
bg-elev: '#ffffff'
bg-card: '#ffffff'
bg-card-hover: '#f5f5f5'
bg-card-active: '#ededed'
surface-overlay: 'rgba(250, 250, 250, 0.78)'
text: '#0a0a0a'
text-strong: '#000000'
text-dim: '#525252'
text-faint: '#a3a3a3'
text-disabled: '#cfcfcf'
text-on-brand: '#ffffff'
brand: '#16a34a'
brand-hover: '#15913f'
brand-pressed: '#117a35'
brand-tint: 'rgba(22, 163, 74, 0.08)'
brand-tint-strong: 'rgba(22, 163, 74, 0.18)'
brand-deep: '#14532d'
border: 'rgba(0, 0, 0, 0.08)'
border-strong: 'rgba(0, 0, 0, 0.15)'
border-subtle: 'rgba(0, 0, 0, 0.04)'
border-brand: 'rgba(22, 163, 74, 0.25)'
border-brand-strong: 'rgba(22, 163, 74, 0.45)'
selection-bg: 'rgba(22, 163, 74, 0.18)'
focus-ring: '#16a34a'
link: '#16a34a'
link-visited: '#14532d'
success: '#16a34a'
warning: '#d97706'
danger: '#dc2626'
info: '#2563eb'
cool-blue:
bg: '#0b1120'
bg-elev: '#111827'
bg-card: '#1a2233'
bg-card-hover: '#212a3e'
bg-card-active: '#2a334a'
surface-overlay: 'rgba(11, 17, 32, 0.72)'
text: '#f1f5f9'
text-strong: '#ffffff'
text-dim: '#94a3b8'
text-faint: '#64748b'
text-disabled: '#475569'
text-on-brand: '#0b1120'
brand: '#06b6d4'
brand-hover: '#22d3ee'
brand-pressed: '#0891b2'
brand-tint: 'rgba(6, 182, 212, 0.10)'
brand-tint-strong: 'rgba(6, 182, 212, 0.25)'
brand-deep: '#0e7490'
border: 'rgba(148, 163, 184, 0.12)'
border-strong: 'rgba(148, 163, 184, 0.20)'
border-subtle: 'rgba(148, 163, 184, 0.06)'
border-brand: 'rgba(6, 182, 212, 0.30)'
border-brand-strong: 'rgba(6, 182, 212, 0.50)'
selection-bg: 'rgba(6, 182, 212, 0.30)'
focus-ring: '#06b6d4'
link: '#06b6d4'
link-visited: '#0e7490'
success: '#10b981'
warning: '#f59e0b'
danger: '#f87171'
info: '#60a5fa'
typography:
display:
family: 'Inter Variable, Inter, -apple-system, sans-serif'
weights: [400, 500]
feature-settings: "'ss01', 'cv11'"
body:
family: 'Inter Variable, Inter, -apple-system, sans-serif'
weights: [400, 500]
feature-settings: "'ss01'"
serif:
family: 'Instrument Serif, Iowan Old Style, Georgia, serif'
style: italic
weight: 400
role: '<em>-tag accent inside display headlines'
mono:
family: 'JetBrains Mono Variable, JetBrains Mono, ui-monospace, monospace'
weights: [400, 500]
feature-settings: "'zero', 'ss01'"
role: 'tool args, code blocks, status labels, metadata'
scale:
display-hero: { size: 72, weight: 500, lineHeight: 0.98, tracking: -0.035, family: display }
display-large: { size: 56, weight: 500, lineHeight: 1.05, tracking: -0.025, family: display }
h1: { size: 48, weight: 500, lineHeight: 1.05, tracking: -0.03, family: display }
h2: { size: 40, weight: 500, lineHeight: 1.05, tracking: -0.025, family: display }
h3: { size: 28, weight: 500, lineHeight: 1.20, tracking: -0.02, family: display }
h4: { size: 22, weight: 500, lineHeight: 1.30, tracking: -0.015, family: display }
h5: { size: 18, weight: 500, lineHeight: 1.35, tracking: -0.01, family: display }
body-lead: { size: 17, weight: 400, lineHeight: 1.55, tracking: -0.01, family: body }
body: { size: 15, weight: 400, lineHeight: 1.65, tracking: -0.005, family: body }
body-small: { size: 13, weight: 400, lineHeight: 1.55, tracking: -0.005, family: body }
caption: { size: 12, weight: 400, lineHeight: 1.45, tracking: 0, family: body }
label-mono: { size: 11, weight: 500, lineHeight: 1.4, tracking: 0.15, family: mono, transform: uppercase }
code-inline: { size: 12, weight: 400, lineHeight: 1.6, tracking: 0, family: mono }
code-block: { size: 13, weight: 400, lineHeight: 1.6, tracking: 0, family: mono }
chat-message: { size: 15, weight: 400, lineHeight: 1.6, tracking: -0.005, family: body }
em-accent: { size: inherit, weight: 400, lineHeight: inherit, family: serif, style: italic, color: brand }
spacing:
base: 4
scale: [0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 80, 96, 128, 160]
named:
none: 0
xxs: 4
xs: 8
sm: 12
md: 16
lg: 24
xl: 32
xxl: 48
section: 64
section-large: 96
section-hero: 128
radius:
none: 0
micro: 3
small: 6
standard: 8
comfortable: 12
card: 16
hero: 24
pill: 9999
breakpoints:
mobile: 480
tablet: 768
laptop: 1024
desktop: 1280
wide: 1536
shadows:
none: 'none'
ambient: '0 1px 2px rgba(0, 0, 0, 0.4)'
popover: '0 10px 30px rgba(0, 0, 0, 0.55), 0 2px 6px rgba(0, 0, 0, 0.4)'
tooltip: '0 4px 14px rgba(0, 0, 0, 0.5)'
toast: '0 12px 36px rgba(0, 0, 0, 0.6), 0 2px 6px rgba(0, 0, 0, 0.4)'
modal: '0 24px 64px rgba(0, 0, 0, 0.65), 0 4px 12px rgba(0, 0, 0, 0.4)'
ambient-light: '0 1px 2px rgba(0, 0, 0, 0.06)'
popover-light: '0 10px 30px rgba(0, 0, 0, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06)'
modal-light: '0 24px 64px rgba(0, 0, 0, 0.18), 0 4px 12px rgba(0, 0, 0, 0.10)'
motion:
ease-standard: 'cubic-bezier(0.4, 0, 0.2, 1)'
ease-emphasized: 'cubic-bezier(0.2, 0, 0, 1)'
ease-decelerate: 'cubic-bezier(0, 0, 0.2, 1)'
ease-accelerate: 'cubic-bezier(0.4, 0, 1, 1)'
duration-instant: 80
duration-fast: 150
duration-standard: 240
duration-slow: 320
duration-slower: 480
reduced-motion: 'respects prefers-reduced-motion: reduce — non-essential transitions become opacity-only at 80ms; cursor-blink animation is replaced with a static lime caret; tool-call phase transitions render instantly without slide-in.'
accessibility:
contrast-text-on-bg-dark: 14.6
contrast-text-on-bg-bright: 17.5
contrast-text-on-bg-cool: 14.0
contrast-text-on-brand-dark: 13.2
contrast-text-on-brand-bright: 4.7
contrast-text-on-brand-cool: 11.8
focus-ring: '2px solid var(--color-focus-ring) with 2px offset on bg'
focus-style: 'visible focus only on keyboard nav (:focus-visible)'
reduced-motion-honored: true
keyboard-nav: 'fully navigable; theme switcher dev-only and excluded from tab order in production'
screen-reader: 'streaming chat output is aria-live="polite"; tool-call phase changes announce via aria-live="polite"; trace viewer accordion uses Radix accordion semantics'
text-min-size: 12
touch-target: 44
dark-mode: 'native — `editorial-dark` is the default; `bright` is the light variant; `cool-blue` is a third option. Theme persists in localStorage as `agentkit:theme` and applies via `data-theme` on `<html>` synchronously before paint.'
stack:
framework: 'Next.js 16 (App Router, Turbopack, React Compiler)'
ui-runtime: React 19
styling: 'Tailwind CSS 4 (CSS-first config, @theme directive)'
ai-sdk: 'Vercel AI SDK v6'
primitives: 'Radix UI (accordion, dialog, slot, tabs, tooltip, popover)'
fonts: '@fontsource — Inter Variable, Instrument Serif, JetBrains Mono Variable'
icons: 'lucide-react'
components:
chat-hero:
role: 'streaming chat panel inline in hero — agent answering a debugging question'
backgroundColor: bg-card
border: border
rounded: card
padding: '24px'
streaming-cursor: 'lime "▋" character with 1s step-end cursor-blink animation; stops on stream end'
use: 'home hero — the kit''s most important visual proof'
agent-trace-viewer:
role: 'expandable multi-step reasoning chain with tool calls visible'
backgroundColor: bg-card
rounded: card
padding: '24px'
expand-anim: 'Radix accordion-down/up with --radix-accordion-content-height, 200ms ease-standard'
use: 'feature row 2 — proof of agent observability'
tool-call-panel:
role: 'visualized tool invocation with 4-phase animation'
phases: [prompt, calling, result, final]
backgroundColor: bg-card
rounded: card
border: border
use: 'feature row 3 — proof of tool-use orchestration'
message-bubble:
role: 'individual chat message — user or assistant'
user-bg: bg-card-hover
assistant-bg: bg-card
rounded: comfortable
padding: '12px 16px'
alignment: 'user right-aligned, assistant left-aligned'
model-selector:
role: 'dropdown selecting model identity (Claude, GPT, Llama)'
rounded: standard
backgroundColor: bg-elev
border: border-strong
primary-button:
backgroundColor: brand
textColor: text-on-brand
rounded: standard
padding: '14px 20px'
font: 'display 14/500 -0.005em'
hover: 'background brand-hover; no scale, no glow'
use: 'commerce CTA, hero "Get AgentKit"'
ghost-button:
backgroundColor: transparent
textColor: text
border: border-strong
rounded: standard
padding: '14px 20px'
hover: 'background card-hover'
use: 'secondary action'
card:
backgroundColor: bg-card
border: border
rounded: card
padding: '24px'
hover: 'background bg-card-hover'
input:
backgroundColor: bg-elev
border: border-strong
rounded: small
padding: '12px 14px'
focus: 'border-brand-strong, ring brand-tint-strong'
label:
backgroundColor: transparent
textColor: text-dim
font: 'mono 11/500 0.15em uppercase'
decorator: '6px brand dot left of text'
badge:
backgroundColor: brand-tint
textColor: brand
border: border-brand
font: 'mono 11/500 0.10em uppercase'
padding: '3px 8px'
rounded: micro
em:
family: serif
style: italic
color: brand
use: 'editorial accent inside display headlines — never grammatical emphasis'
---
## 1. Visual Theme & Atmosphere
AgentKit is a **landing page kit for AI agent products** — built around
the visual primitives that AI agent products actually need (streaming
chat, agent trace viewer, tool-call visualizer, multi-step reasoning
panels) rather than retrofitting a generic SaaS template. The kit's
contribution to the genre is precisely those three anchor components:
`<ChatHero>` (the agent answering a debugging question, live-streaming
in the hero), `<AgentTraceViewer>` (an expandable multi-step reasoning
chain), and `<ToolCallPanel>` (a four-phase visualization of a tool
invocation: prompt → calling → result → final).
The system is **theme-swappable from day one**: the same component
library renders identically in three palettes — `editorial-dark`
(default, acid-lime on near-black), `bright` (warm-emerald on
off-white), and `cool-blue` (cyan on slate). Theme switches via a
single `data-theme` attribute on `<html>`, persisted in `localStorage`
as `agentkit:theme`, and applied **synchronously before paint** via
an inline script in `<head>` to prevent FOUC. The same component code
references CSS variables only — never hex literals — so palette swap
is a single attribute change.
The atmospheric move is that **type and layout do not change between
themes**. The same Inter / Instrument Serif italic / JetBrains Mono
voices, the same 72px display hero, the same `-0.035em` tracking,
the same `<em>` token rule. Only color swaps. This proves a
designer's claim: hierarchy comes from *size and tracking*, not
hue. A user moving from editorial-dark to bright should feel a
palette shift, not a redesign.
The brand voice is **technical, calm, agent-aware**. Headlines are
imperative and ground-truthed (*"Ship your AI agent's landing page
<em>this afternoon</em>"*). Section labels are mono uppercase with a
6px brand dot — the rhythm anchor of every page. The streaming
cursor is a brand-colored `▋` character that blinks at 1 Hz only
during active stream and disappears the moment the agent finishes
speaking.
**Key Characteristics**
- Three palettes, one component library
- Theme swap via `data-theme` attribute, persisted in localStorage
- Type system unchanged across themes
- Anchor components define the agent-product genre
- `<em>` as a design token (Instrument Serif italic in brand color)
- Mono uppercase labels with brand dot rhythm
- Streaming cursor `▋` with 1 Hz blink during active stream
- Component code references CSS variables only — never hex
## 2. Color Palette & Roles
The kit ships **three palettes**. Each defines the same role-based
tokens; component code references `var(--color-*)`, never hex. Below,
each role is listed with all three values: `editorial-dark / bright /
cool-blue`.
### Primary
- **bg** — `#0a0a0a` / `#fafafa` / `#0b1120`. The page ground.
- **text** — `#ededed` / `#0a0a0a` / `#f1f5f9`. The default reading
color.
- **brand** — `#c6f432` / `#16a34a` / `#06b6d4`. The single accent.
### Brand & Accent
- **brand** — acid-lime / warm-emerald / cyan. Each theme picks a
brand that contrasts AAA against the page ground.
- **brand-hover** — `#d2f854` / `#15913f` / `#22d3ee`. Used on button
hover (lighten on dark themes, darken on bright).
- **brand-pressed** — `#b6e426` / `#117a35` / `#0891b2`. Used on
button press.
- **brand-tint** — translucent brand at 8 – 10% opacity. Badge
background, halo on hover.
- **brand-tint-strong** — translucent brand at 18 – 25% opacity.
Focus ring fill, active selection underlay.
- **brand-deep** — a darker, lower-saturation cousin. Visited link
color.
### Surfaces
- **bg-elev** — `#0f0f0f` / `#ffffff` / `#111827`. Sticky nav, input
field, subtle container contrast.
- **bg-card** — `#141416` / `#ffffff` / `#1a2233`. Content panels,
message bubbles.
- **bg-card-hover** — `#1a1a1c` / `#f5f5f5` / `#212a3e`. Hovered
card.
- **bg-card-active** — `#202024` / `#ededed` / `#2a334a`. Pressed
or selected card.
- **surface-overlay** — translucent page-bg at 72 – 78% with
`backdrop-filter: blur(6px)`. Modal scrim.
### Text Scale
- **text-strong** — pure white / pure black / pure white. Reserved
for AAA edge cases against a slightly lifted card.
- **text** — default body and heading color.
- **text-dim** — supporting copy, subtitles, inactive nav links.
- **text-faint** — metadata, footer, disabled.
- **text-disabled** — explicitly disabled controls.
- **text-on-brand** — `#0a0a0a` / `#ffffff` / `#0b1120`. Black on
lime, white on emerald, near-black on cyan. Each theme picks the
text color that hits AAA against its brand.
### Borders
- **border** — translucent text color at ~8% opacity. Default card
edge.
- **border-strong** — translucent text color at ~15% opacity. Inputs,
buttons, emphasized rows.
- **border-subtle** — translucent text color at ~4% opacity. Hairline
dividers in dense lists.
- **border-brand** — translucent brand at ~25% opacity. Featured
pricing tier outline.
- **border-brand-strong** — translucent brand at ~45% opacity.
Focused input outline, active toggle.
### Interactive
- **link** — `brand`. Decoration color is `text-faint` by default,
shifts to `brand` on hover, decoration offset 4px.
- **focus-ring** — `brand`. `2px solid` with `2px offset` against
the page ground.
- **selection** — translucent brand at 18 – 30% opacity.
### Semantic
| Role | dark | bright | cool-blue |
| --- | --- | --- | --- |
| success | `#22c55e` | `#16a34a` | `#10b981` |
| warning | `#f59e0b` | `#d97706` | `#f59e0b` |
| danger | `#ef4444` | `#dc2626` | `#f87171` |
| info | `#60a5fa` | `#2563eb` | `#60a5fa` |
Semantic colors are reserved for **system feedback** — toasts, form
errors, status badges. They do not appear in marketing composition.
## 3. Typography Rules
### Font Family
- **Display & Body**: Inter Variable. Self-hosted via
`@fontsource-variable/inter`.
- **Serif accent**: Instrument Serif italic 400 only. Self-hosted via
`@fontsource/instrument-serif`.
- **Mono**: JetBrains Mono Variable. Self-hosted via
`@fontsource-variable/jetbrains-mono`.
OpenType features explicitly enabled on Inter: `'ss01'` (single-storey
`g`), `'cv11'` (lowercase `l` with serif). On JetBrains Mono:
`'zero'` (slashed zero), `'ss01'` (no-ligature mode for code blocks).
### Hierarchy
| Role | Font | Size | Weight | Line Height | Tracking | OT | Notes |
| --- | --- | --- | --- | --- | --- | --- | --- |
| display-hero | Inter | 72 | 500 | 0.98 | -0.035 | ss01 cv11 | Hero on every theme |
| display-large | Inter | 56 | 500 | 1.05 | -0.025 | ss01 cv11 | Section hero |
| h1 | Inter | 48 | 500 | 1.05 | -0.03 | ss01 | Page title |
| h2 | Inter | 40 | 500 | 1.05 | -0.025 | ss01 | Section opener |
| h3 | Inter | 28 | 500 | 1.20 | -0.02 | ss01 | Component title |
| h4 | Inter | 22 | 500 | 1.30 | -0.015 | — | Subsection |
| h5 | Inter | 18 | 500 | 1.35 | -0.01 | — | Card title |
| body-lead | Inter | 17 | 400 | 1.55 | -0.01 | — | Hero subtitle |
| body | Inter | 15 | 400 | 1.65 | -0.005 | — | Default running text |
| body-small | Inter | 13 | 400 | 1.55 | -0.005 | — | Caption |
| caption | Inter | 12 | 400 | 1.45 | 0 | — | Footer rows |
| label-mono | JetBrains | 11 | 500 | 1.4 | 0.15 | zero | Section markers |
| code-inline | JetBrains | 12 | 400 | 1.6 | 0 | zero | `<code>` inside prose |
| code-block | JetBrains | 13 | 400 | 1.6 | 0 | zero ss01 | `<pre>`, no ligatures |
| chat-message | Inter | 15 | 400 | 1.6 | -0.005 | — | Streaming chat body |
| em-accent | Instrument Serif | inherit | 400 | inherit | inherit | — | `<em>` italic in brand color |
### Principles
- **Display tightens with size.** `-0.035em` at 72px → `-0.005em` at
15px → `0` at 12px. The reverse of the browser default.
- **Weights stay restrained.** Display is `500`, never `700`. Body
is `400`. The only `500`+ surfaces are mono labels and button text.
- **`<em>` is a design token.** Instrument Serif italic in brand
color. Used inside display headlines only.
- **Type is theme-invariant.** Sizes, weights, and tracking do not
change between editorial-dark / bright / cool-blue. Only colors
swap.
- **Streaming cursor.** A brand-colored `▋` glyph with a 1s
step-end blink, applied via `.cursor-blink::after`. Visible only
during active stream.
- **OpenType is global.** `font-feature-settings` is set on `<html>`
to opt into `ss01` and `cv11` once.
- **Mono is reserved.** JetBrains Mono only on labels, code, tool
args, and numeric data — never body prose.
## 4. Component Stylings
### Button — Primary
- Background: `var(--color-brand)`
- Text: `var(--color-text-on-brand)`
- Padding: `14px 20px`
- Radius: `standard` (8px)
- Font: Inter 14 / 500, tracking `-0.005em`
- Hover: background → `brand-hover`. **No scale, no glow, no
translate.**
- Active: background → `brand-pressed`.
- Disabled: opacity `0.40`, cursor `not-allowed`.
- Use: hero CTA — *Get AgentKit*, *Buy*, *Sign up*.
### Button — Ghost
- Background: transparent
- Text: `var(--color-text)`
- Padding: `14px 20px`
- Radius: `standard` (8px)
- Border: `1px solid var(--color-border-strong)`
- Hover: background → `bg-card-hover`; border tightens to `text-dim`.
- Use: secondary action paired with a primary CTA.
### Button — Icon
- 36px square, `comfortable` radius (12px), `text-dim` glyph.
- Hover: background → `bg-card-hover`, glyph → `text`.
- Use: copy-to-clipboard, theme-switch (dev only), dismiss.
### Card
- Background: `var(--color-bg-card)`
- Border: `1px solid var(--color-border)`
- Radius: `card` (16px)
- Padding: `24px` default, `32px` for featured tier.
- Hover: background → `bg-card-hover`. No translate.
- No shadow on dark themes; on bright theme a subtle ambient-light
shadow may be used (1px 2px at 6% opacity).
### ChatHero (anchor component)
- Background: `bg-card`
- Border: `1px solid border`
- Radius: `card` (16px)
- Padding: `24px`
- Header: `Label` mono uppercase row at top — *"AGENT • LIVE"* — with
brand dot.
- Body: alternating message bubbles, `assistant-bg = bg-card`,
`user-bg = bg-card-hover`.
- Streaming cursor: `▋` glyph in `brand` color with `cursor-blink`
1s step-end animation, stops on stream end.
### AgentTraceViewer (anchor component)
- Background: `bg-card`
- Radius: `card` (16px)
- Padding: `24px`
- Each step: numbered `01.`, `02.`, mono uppercase, with a
collapse/expand chevron on the right.
- Open state: Radix `accordion-down` with
`--radix-accordion-content-height`, 200ms `ease-standard`.
### ToolCallPanel (anchor component)
- Background: `bg-card`
- Border: `1px solid border`
- Radius: `card` (16px)
- 4 phases — `prompt` → `calling` → `result` → `final` — each as a
small card with mono-uppercase label and code-inline tool name.
- Phase progression: each card slides in from below with 8px translate
and fades in over 240ms `ease-emphasized`. The `calling` card shows
a spinning `text-dim` `Loader` icon; the `result` card shows a
`success` checkmark.
### MessageBubble
- User bubble: `bg-card-hover`, right-aligned, max-width 80%.
- Assistant bubble: `bg-card`, left-aligned, max-width 100%.
- Padding: `12px 16px`, radius: `comfortable` (12px).
- Code blocks inside: JetBrains Mono 13px on `bg-elev` with `small`
radius.
### ModelSelector
- Background: `bg-elev`
- Border: `1px solid border-strong`
- Radius: `standard` (8px)
- Trigger shows model logo + name + chevron; popover lists available
models with selected one in `brand`.
### Input
- Background: `bg-elev`
- Text: `text`; placeholder `text-faint`
- Border: `1px solid border-strong`
- Padding: `12px 14px`
- Radius: `small` (6px)
- Focus: border → `border-brand-strong`; ring `0 0 0 2px brand-tint-strong`.
### Label
- Mono 11 / 500 / 0.15em / uppercase, color `text-dim`.
- 6px solid `brand` dot, 8px to the left of the text.
- The rhythm anchor of every section.
### Badge
- Background: `brand-tint`
- Text: `brand`
- Border: `1px solid border-brand`
- Mono 11 / 500 / 0.10em / uppercase, padding `3px 8px`, radius
`micro` (3px).
### Em
- Instrument Serif italic 400, color `brand`, inherits size and
line-height from parent.
- Used inside display headlines only.
## 5. Layout Principles
### Spacing System
- Base unit: `4px`. Scale: `[0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64,
80, 96, 128, 160]`.
- Named: `xxs` → `xs` → `sm` → `md` → `lg` → `xl` → `xxl` → `section`
(64) → `section-large` (96) → `section-hero` (128).
### Grid & Container
- `page-width` (1200px) — the full marketing page.
- `prose-width` (800px) — long-form text columns.
- Hero is `1fr 1fr` desktop, single-column mobile.
- Streaming feature row: `1.4fr 1fr` (chat panel weighted larger).
- Trace viewer feature row: `1fr 1fr`.
- Tool-call feature row: `1.4fr 1fr`.
### Whitespace Philosophy
Section rhythm uses `--space-13` (128px) between major sections on
desktop; scales to `--space-10` (64px) on mobile. Hero gets an extra
32px of top padding.
### Section Cadence
Sections do **not** alternate light/dark bands. The page is a single
ground tone with cards and elevation doing the visual layering.
Section labels (mono uppercase + brand dot) mark "new section starts
here".
## 6. Shapes & Radius Scale
| Tier | Value | Use |
| --- | --- | --- |
| none | 0px | Full-bleed dividers |
| micro | 3px | Badges, mono code highlights |
| small | 6px | Inputs, dropdowns |
| standard | 8px | Buttons, most interactive surfaces |
| comfortable | 12px | Message bubbles, FAQ rows |
| card | 16px | Content cards, ChatHero, TraceViewer |
| hero | 24px | Large hero panels, theme-preview tile |
| pill | 9999px | Toggle pills, status chips |
Pure-zero radius is forbidden except on full-bleed dividers. The mix
of `8px` (functional) and `16px` (card) gives the page calm
geometry without feeling Web-3 bubbly.
## 7. Depth & Elevation
| Level | Treatment | Use |
| --- | --- | --- |
| 0 | flat — `bg` ground | Default |
| 1 | `bg-elev` | Sticky nav, input field |
| 2 | `bg-card` | Cards, anchor components |
| 3 | `bg-card-hover` | Hovered card |
| 4 | `surface-overlay` + blur | Modal scrim |
| 5 | `shadow.modal` + level-4 | Floating dialog |
**Shadow Philosophy.** Tonal stacking, not shadows. The 4-tier surface
scale provides implicit depth on every theme. Drop shadows are
reserved for floating UI primitives only — Tooltip, Popover, Toast,
Dialog. Cards use borders and surface elevation, not shadows. The
`bright` theme uses softer, lower-opacity black shadows; the dark
themes use higher-opacity neutral black.
## 8. Interaction & Motion
### Easing
- `ease-standard` `cubic-bezier(0.4, 0, 0.2, 1)` — default for hovers,
state changes, and accordion.
- `ease-emphasized` `cubic-bezier(0.2, 0, 0, 1)` — modal entrance,
tool-call phase progression, page-level transitions.
- `ease-decelerate` `cubic-bezier(0, 0, 0.2, 1)` — incoming elements.
- `ease-accelerate` `cubic-bezier(0.4, 0, 1, 1)` — outgoing elements.
### Durations
- `duration-instant` 80ms — micro-feedback (toggle thumb, copy
acknowledgement).
- `duration-fast` 150ms — button hover, link underline.
- `duration-standard` 240ms — card hover, input focus ring,
tool-call phase entrance.
- `duration-slow` 320ms — modal entrance, theme swap fade.
- `duration-slower` 480ms — page transitions, hero reveal.
### Per-component micro-states
- **Button hover** — background tint shifts (`brand` → `brand-hover`)
over 150ms. No translate, no scale, no shadow.
- **Card hover** — background `bg-card` → `bg-card-hover` over 240ms.
- **Link hover** — decoration color `text-faint` → `brand` over
150ms.
- **Input focus** — ring fades in at 240ms with `ease-emphasized`.
- **Accordion (TraceViewer)** — Radix `accordion-down` /
`accordion-up` with `--radix-accordion-content-height`, 240ms
`ease-standard`.
- **Modal entrance** — opacity 0 → 1 with translate-y 8px → 0 over
320ms `ease-emphasized`.
- **Tool-call phase progression** — each phase card opacity 0 → 1
with translate-y 8px → 0 over 240ms `ease-emphasized`. Phases
advance every 800 – 1200ms during the loop.
- **Streaming cursor** — `cursor-blink` 1s `step-end` infinite.
Stops on stream end (visibility goes `hidden`).
- **Theme swap** — when `data-theme` changes, `<html>` transitions
`background-color` and `color` over 320ms `ease-standard`.
### Page transitions
The kit ships **without** view-transitions; each page loads
independently. Adopters can opt in via Next 16 view-transitions where
appropriate.
### Reduced motion
Honored at the root via `prefers-reduced-motion: reduce`. All
non-essential transitions become opacity-only at 80ms. The
streaming `cursor-blink` is replaced with a static brand-colored
caret. Tool-call phase entrances render instantly with no slide-in.
Theme swap snaps without transition.
## 9. Accessibility & A11y
### Contrast
| Pair | dark | bright | cool-blue |
| --- | --- | --- | --- |
| text on bg | 14.6 (AAA) | 17.5 (AAA) | 14.0 (AAA) |
| text-dim on bg | 5.9 (AA) | 7.4 (AAA) | 5.6 (AA) |
| text-on-brand on brand | 13.2 (AAA) | 4.7 (AA) | 11.8 (AAA) |
| brand on bg | 14.1 (AAA) | 4.5 (AA) | 6.5 (AA) |
The `bright` theme is tuned so emerald `#16a34a` clears AA at body
sizes against `#fafafa`; for AAA on small text, fall back to
`brand-deep` (`#14532d`).
### Focus indicators
A `2px solid var(--color-focus-ring)` ring with `2px offset` wraps
every interactive element. Uses `:focus-visible` so the ring only
appears on keyboard focus.
### ARIA patterns
- **ChatHero** streams: outer container is `aria-live="polite"
aria-busy={isStreaming}`; finished messages are not announced
again.
- **AgentTraceViewer** uses Radix `Accordion` semantics; each step
trigger is a `<button>` with proper `aria-expanded`.
- **ToolCallPanel** phase changes are announced via a hidden
`aria-live="polite"` region: *"Tool call: search_web. Phase:
result."*
- **ModelSelector** uses Radix `Select` (combobox pattern,
WAI-ARIA 1.2).
- **Theme switcher** (dev mode) uses Radix `ToggleGroup`.
### Keyboard nav
Tab order matches DOM order. The `<ChatHero>` chat input is
focusable and has `aria-label="Send a message to the agent"`.
The theme switcher is excluded from production tab order.
### Reduced motion
See §8. The streaming cursor and tool-call phase animation are
the two motion-heavy elements; both fall back to a static state
under reduced motion.
### Screen reader
Streaming chat output is announced incrementally via `aria-live`.
`<Label>` rows next to a heading are `aria-hidden`. Icon-only buttons
carry `aria-label`.
### Sizes
Minimum text size is `12px` (caption). Touch targets meet the 44px
minimum on mobile; chat input field is 48px height.
## 10. Responsive Behavior
| Breakpoint | Width | Anchor |
| --- | --- | --- |
| mobile | <480 | Single column, hero 48px |
| tablet | 480 – 768 | Single column, hero 56px |
| laptop | 768 – 1024 | Two-column where helpful, hero 64px |
| desktop | 1024 – 1280 | Full grids, hero 72px |
| wide | ≥1280 | Page-width capped at 1200 |
### Touch targets
44px minimum across mobile and tablet. Chat input is 48px.
### Collapsing strategy
- **Hero `1fr 1fr`** → stacks to single-column at <768px.
- **ChatHero feature row `1.4fr 1fr`** → stacks at <1024px with
chat above prose.
- **TraceViewer `1fr 1fr`** → stacks at <1024px.
- **ToolCallPanel `1.4fr 1fr`** → stacks at <1024px.
- **Pricing 3-up** → 2-up at <1024px → 1-up at <640px.
### Image behavior
Theme-preview tiles use `aspect-ratio: 4/3` with `object-fit: cover`
inside a `bg-card` plate.
### Container queries
Used on `<MessageBubble>` so user-bubble width adapts when the chat
panel is in a sidebar vs full-width context.
## 11. Content & Voice
### Tone
**Technical, calm, agent-aware.** AgentKit writes for the developer
shipping their first agent product. Headlines are imperative and
ground-truthed. Adjectives are sparse; verbs are specific. Sample
hero: *"Ship your AI agent's landing page <em>this afternoon</em>.
65 components. 9 sections. Three swappable themes. One install."*
### Microcopy patterns
- **Buttons use verbs.** *Get AgentKit*, *Buy*, *View source*,
*Read the docs*, *Try the demo*.
- **Errors describe the cause.** *"OPENAI_API_KEY missing. Add it to
`.env.local` and restart."*
- **Success is quiet.** *"Theme set to bright."* — not *"Your theme
preference has been successfully updated!"*
- **Empty states explain how to fill them.** *"No messages yet. Type
below to ping the agent."*
### CTA verb conventions
- Primary: *Get AgentKit*, *Buy*, *Sign up*, *Try the demo*.
- Secondary: *View source*, *Read the docs*, *See examples*.
- Tertiary (link): *Learn more*, *Browse components*, *See all*.
The kit avoids: *Click here*, *Submit*, *Get started for free*,
*Transform your business*.
## 12. Dark Mode & Theming
AgentKit is **theme-first**. Three themes ship by default —
`editorial-dark` (default), `bright` (light), and `cool-blue`
(slate). Theme is selected via a `data-theme` attribute on `<html>`
and persisted in `localStorage` as `agentkit:theme`. An inline
script in `<head>` reads the stored value and applies it
synchronously **before paint** to prevent FOUC:
```html
<script>
try {
var t = localStorage.getItem('agentkit:theme') || 'editorial-dark';
document.documentElement.setAttribute('data-theme', t);
document.documentElement.style.colorScheme = t === 'bright' ? 'light' : 'dark';
} catch (e) {}
</script>
```
CSS variables are declared per theme inside `:root[data-theme="..."]`
selectors using Tailwind 4's `@theme` directive. Components reference
`var(--color-*)` tokens only — never hex literals — so swapping
themes is a single attribute change with zero component rewrites.
When a developer ships AgentKit in production, they typically pick
**one** theme and remove the dev-only theme switcher from their
build. The system supports all three at runtime, but production
sites usually commit to one identity.
### System preference
`prefers-color-scheme` is read on first load. Users on a light OS
default to `bright`; users on a dark OS default to `editorial-dark`.
Stored preference always wins over system preference.
## 13. Lineage & Influences
AgentKit extends webdesignhot's editorial-dark canvas into a
three-theme system inspired by Vercel's Geist (themed but locked
to a single component library) and Linear's spatial restraint.
The chat-hero + agent-trace-viewer + tool-call-panel anchor
components are the kit's own contribution — there's no reference for
"agent product landing page" yet, so the kit defines the genre. The
cool-blue theme borrows its palette discipline from Stripe (deep
navy + cyan accent) for fintech-adjacent products; the bright theme
tracks Resend's clean daylight feel. Type system is unchanged across
themes — only color swaps — proving that hierarchy comes from size
and tracking, not hue.
What it rejects: gradient hero backgrounds, glow shadows, illustrated
3D agent mascots, "AI sparkles" iconography, multi-accent palettes,
600+ display weights, marketing pages that don't show the product.
**Named influences**
- [webdesignhot](https://www.webdesignhot.com) — source canvas, type
voices, em-as-token rule.
- [Vercel Geist](https://vercel.com/geist/introduction) — themed but
unified component library pattern.
- [Linear](https://linear.app) — spatial restraint, dense
agent-product surfaces.
- [Stripe](https://stripe.com) — cool-blue palette discipline
(fintech-grade calm).
- [Resend](https://resend.com) — bright theme's daylight clarity.
- [Anthropic](https://anthropic.com) — editorial calm, mono-with-dot
section rhythm.
- [Rauno Freiberg](https://rauno.me) — italic-serif `<em>` accents.
## 14. Do's and Don'ts
### Do
- Pick **one** theme before shipping production.
- Use `<em>` for italic-serif accents inside display headlines.
- Reference colors via `var(--color-*)` only — never hex literals.
- Keep `<Label>` mono uppercase + brand dot at every section.
- Use the supplied keyframes (`accordion-down`, `accordion-up`,
`cursor-blink`, `fade-in-up`).
- Apply theme via `data-theme` synchronously in `<head>` to prevent
FOUC.
- Use `text-on-brand` (theme-aware) on the brand CTA — never default
to white or black.
- Honor `prefers-reduced-motion` everywhere.
- Use `:focus-visible` so the focus ring only appears on keyboard
nav.
- Cap chat-message width at 80% so messages remain scannable.
### Don't
- Introduce a second accent color per theme.
- Use `brand` as a gradient or glow — solid fill only.
- `box-shadow` cards for depth — use `bg-card-hover` and
`border-strong` instead.
- Hard-code hex values in components — always `var(--color-token)`.
- Ship with the theme switcher visible to your end users.
- Use bold (`700`+) weights on display type.
- Translate or scale buttons on hover — color-only state changes.
- Use `<em>` for grammatical emphasis — it's a design token.
- Mix tokens between themes (e.g. dark text on bright background).
- Skip the streaming-cursor stop logic — the caret must disappear
the moment the agent finishes speaking.
## 15. Agent Prompt Guide
### Quick Color Reference (editorial-dark default)
```
bg: #0a0a0a
text: #ededed
text-dim: #8a8a8a
brand: #c6f432
text-on-brand:#0a0a0a
bg-card: #141416
border: rgba(255,255,255,0.08)
focus-ring: #c6f432
```
### Bright theme
```
bg: #fafafa | text: #0a0a0a | brand: #16a34a | text-on-brand: #fff
```
### Cool-blue theme
```
bg: #0b1120 | text: #f1f5f9 | brand: #06b6d4 | text-on-brand: #0b1120
```
### Example Component Prompts
1. *"Create an AgentKit ChatHero in the editorial-dark theme:
`#141416` background, 16px radius, 24px padding, 1px
`rgba(255,255,255,0.08)` border. Header is a mono uppercase row
'AGENT • LIVE' with a 6px `#c6f432` dot. Below, alternating
message bubbles — assistant on `#141416` left-aligned, user on
`#1a1a1c` right-aligned, both 12px radius. Streaming cursor is a
`#c6f432` `▋` glyph blinking at 1s step-end."*
2. *"Build an AgentTraceViewer card: `bg-card` background, 16px
radius, 24px padding. Each step starts with a mono uppercase
`01.` label in `text-dim`, the step title in 22px Inter / 500.
Steps expand via Radix accordion with
`--radix-accordion-content-height` over 240ms `ease-standard`.
Inside an open step, render tool-call rows with mono code-inline
for tool name and args."*
3. *"Compose a ToolCallPanel with 4 phases — prompt, calling, result,
final — each as a small card with mono uppercase phase label and
code-inline tool name. Phase progression slides each card in from
below with 8px translate over 240ms `ease-emphasized`. Calling
shows a spinning `text-dim` Loader; result shows a `success`
checkmark."*
4. *"Design a primary button in the bright theme: `#16a34a`
background, white text, 14px Inter / 500, 14/20px padding, 8px
radius. Hover lightens to `#15913f` over 150ms — no scale, no
glow."*
5. *"Build a theme-preview row showing the same hero in all three
themes side-by-side: each tile is 4/3 aspect, `card` (16px)
radius, 1px theme-appropriate border, with a mono uppercase
label below the tile naming the theme. Tiles render the same
ChatHero component — only colors differ."*
6. *"Create a section anchor: 64px section padding, mono uppercase
label '03 — TRACE VIEWER' in `text-dim` 11/500/0.15em with brand
dot, a 40px Inter / 500 / -0.025 tracking headline below, and an
optional Instrument Serif italic `<em>` accent inside the
headline."*
### Iteration Guide
1. **Pick the default theme first.** Do all your composition in
`editorial-dark` until the layout reads correctly. Only after the
structure is solid, swap to `bright` and `cool-blue` and tune
contrast.
2. **Reference variables only.** If you find yourself writing
`#c6f432` in a component, replace it with `var(--color-brand)`
immediately. The single discipline that makes the kit work.
3. **Hold the accent in reserve.** Don't introduce the brand color
until the layout reads correctly without it. The accent should
arrive as a deliberate moment.
4. **Build the anchor components first.** ChatHero, AgentTraceViewer,
and ToolCallPanel are what differentiate the kit. Compose
sections around them, not the other way around.
5. **Use `<em>` once per hero.** Place exactly one Instrument Serif
italic accent inside the display headline. Test that removing
it flattens the page; test that adding a second one fights for
attention.
6. **Apply the theme synchronously.** Read `localStorage` and set
`data-theme` on `<html>` in an inline `<head>` script before
first paint. FOUC is the most common single mistake when
shipping multi-theme.
7. **Stop the streaming cursor.** The most common bug: the `▋`
keeps blinking after the stream ends. Wire `isStreaming === false`
to `visibility: hidden` on the cursor.
8. **Audit accent count per theme.** When you're done, count every
`var(--color-brand)` reference. If it's above ~8 per page, remove
the weakest two. The kit is at its strongest when the accent is
rare on every theme.
1. Visual Theme & Atmosphere
AgentKit is a landing page kit for AI agent products — built around
the visual primitives that AI agent products actually need (streaming
chat, agent trace viewer, tool-call visualizer, multi-step reasoning
panels) rather than retrofitting a generic SaaS template. The kit’s
contribution to the genre is precisely those three anchor components:
<ChatHero> (the agent answering a debugging question, live-streaming
in the hero), <AgentTraceViewer> (an expandable multi-step reasoning
chain), and <ToolCallPanel> (a four-phase visualization of a tool
invocation: prompt → calling → result → final).
The system is theme-swappable from day one: the same component
library renders identically in three palettes — editorial-dark
(default, acid-lime on near-black), bright (warm-emerald on
off-white), and cool-blue (cyan on slate). Theme switches via a
single data-theme attribute on <html>, persisted in localStorage
as agentkit:theme, and applied synchronously before paint via
an inline script in <head> to prevent FOUC. The same component code
references CSS variables only — never hex literals — so palette swap
is a single attribute change.
The atmospheric move is that type and layout do not change between
themes. The same Inter / Instrument Serif italic / JetBrains Mono
voices, the same 72px display hero, the same -0.035em tracking,
the same <em> token rule. Only color swaps. This proves a
designer’s claim: hierarchy comes from size and tracking, not
hue. A user moving from editorial-dark to bright should feel a
palette shift, not a redesign.
The brand voice is technical, calm, agent-aware. Headlines are
imperative and ground-truthed (“Ship your AI agent’s landing page
this afternoon”). Section labels are mono uppercase with a
6px brand dot — the rhythm anchor of every page. The streaming
cursor is a brand-colored ▋ character that blinks at 1 Hz only
during active stream and disappears the moment the agent finishes
speaking.
Key Characteristics
- Three palettes, one component library
- Theme swap via
data-themeattribute, persisted in localStorage - Type system unchanged across themes
- Anchor components define the agent-product genre
<em>as a design token (Instrument Serif italic in brand color)- Mono uppercase labels with brand dot rhythm
- Streaming cursor
▋with 1 Hz blink during active stream - Component code references CSS variables only — never hex
2. Color Palette & Roles
The kit ships three palettes. Each defines the same role-based
tokens; component code references var(--color-*), never hex. Below,
each role is listed with all three values: editorial-dark / bright / cool-blue.
Primary
- bg —
#0a0a0a/#fafafa/#0b1120. The page ground. - text —
#ededed/#0a0a0a/#f1f5f9. The default reading color. - brand —
#c6f432/#16a34a/#06b6d4. The single accent.
Brand & Accent
- brand — acid-lime / warm-emerald / cyan. Each theme picks a brand that contrasts AAA against the page ground.
- brand-hover —
#d2f854/#15913f/#22d3ee. Used on button hover (lighten on dark themes, darken on bright). - brand-pressed —
#b6e426/#117a35/#0891b2. Used on button press. - brand-tint — translucent brand at 8 – 10% opacity. Badge background, halo on hover.
- brand-tint-strong — translucent brand at 18 – 25% opacity. Focus ring fill, active selection underlay.
- brand-deep — a darker, lower-saturation cousin. Visited link color.
Surfaces
- bg-elev —
#0f0f0f/#ffffff/#111827. Sticky nav, input field, subtle container contrast. - bg-card —
#141416/#ffffff/#1a2233. Content panels, message bubbles. - bg-card-hover —
#1a1a1c/#f5f5f5/#212a3e. Hovered card. - bg-card-active —
#202024/#ededed/#2a334a. Pressed or selected card. - surface-overlay — translucent page-bg at 72 – 78% with
backdrop-filter: blur(6px). Modal scrim.
Text Scale
- text-strong — pure white / pure black / pure white. Reserved for AAA edge cases against a slightly lifted card.
- text — default body and heading color.
- text-dim — supporting copy, subtitles, inactive nav links.
- text-faint — metadata, footer, disabled.
- text-disabled — explicitly disabled controls.
- text-on-brand —
#0a0a0a/#ffffff/#0b1120. Black on lime, white on emerald, near-black on cyan. Each theme picks the text color that hits AAA against its brand.
Borders
- border — translucent text color at ~8% opacity. Default card edge.
- border-strong — translucent text color at ~15% opacity. Inputs, buttons, emphasized rows.
- border-subtle — translucent text color at ~4% opacity. Hairline dividers in dense lists.
- border-brand — translucent brand at ~25% opacity. Featured pricing tier outline.
- border-brand-strong — translucent brand at ~45% opacity. Focused input outline, active toggle.
Interactive
- link —
brand. Decoration color istext-faintby default, shifts tobrandon hover, decoration offset 4px. - focus-ring —
brand.2px solidwith2px offsetagainst the page ground. - selection — translucent brand at 18 – 30% opacity.
Semantic
| Role | dark | bright | cool-blue |
|---|---|---|---|
| success | #22c55e | #16a34a | #10b981 |
| warning | #f59e0b | #d97706 | #f59e0b |
| danger | #ef4444 | #dc2626 | #f87171 |
| info | #60a5fa | #2563eb | #60a5fa |
Semantic colors are reserved for system feedback — toasts, form errors, status badges. They do not appear in marketing composition.
3. Typography Rules
Font Family
- Display & Body: Inter Variable. Self-hosted via
@fontsource-variable/inter. - Serif accent: Instrument Serif italic 400 only. Self-hosted via
@fontsource/instrument-serif. - Mono: JetBrains Mono Variable. Self-hosted via
@fontsource-variable/jetbrains-mono.
OpenType features explicitly enabled on Inter: 'ss01' (single-storey
g), 'cv11' (lowercase l with serif). On JetBrains Mono:
'zero' (slashed zero), 'ss01' (no-ligature mode for code blocks).
Hierarchy
| Role | Font | Size | Weight | Line Height | Tracking | OT | Notes |
|---|---|---|---|---|---|---|---|
| display-hero | Inter | 72 | 500 | 0.98 | -0.035 | ss01 cv11 | Hero on every theme |
| display-large | Inter | 56 | 500 | 1.05 | -0.025 | ss01 cv11 | Section hero |
| h1 | Inter | 48 | 500 | 1.05 | -0.03 | ss01 | Page title |
| h2 | Inter | 40 | 500 | 1.05 | -0.025 | ss01 | Section opener |
| h3 | Inter | 28 | 500 | 1.20 | -0.02 | ss01 | Component title |
| h4 | Inter | 22 | 500 | 1.30 | -0.015 | — | Subsection |
| h5 | Inter | 18 | 500 | 1.35 | -0.01 | — | Card title |
| body-lead | Inter | 17 | 400 | 1.55 | -0.01 | — | Hero subtitle |
| body | Inter | 15 | 400 | 1.65 | -0.005 | — | Default running text |
| body-small | Inter | 13 | 400 | 1.55 | -0.005 | — | Caption |
| caption | Inter | 12 | 400 | 1.45 | 0 | — | Footer rows |
| label-mono | JetBrains | 11 | 500 | 1.4 | 0.15 | zero | Section markers |
| code-inline | JetBrains | 12 | 400 | 1.6 | 0 | zero | <code> inside prose |
| code-block | JetBrains | 13 | 400 | 1.6 | 0 | zero ss01 | <pre>, no ligatures |
| chat-message | Inter | 15 | 400 | 1.6 | -0.005 | — | Streaming chat body |
| em-accent | Instrument Serif | inherit | 400 | inherit | inherit | — | <em> italic in brand color |
Principles
- Display tightens with size.
-0.035emat 72px →-0.005emat 15px →0at 12px. The reverse of the browser default. - Weights stay restrained. Display is
500, never700. Body is400. The only500+ surfaces are mono labels and button text. <em>is a design token. Instrument Serif italic in brand color. Used inside display headlines only.- Type is theme-invariant. Sizes, weights, and tracking do not change between editorial-dark / bright / cool-blue. Only colors swap.
- Streaming cursor. A brand-colored
▋glyph with a 1s step-end blink, applied via.cursor-blink::after. Visible only during active stream. - OpenType is global.
font-feature-settingsis set on<html>to opt intoss01andcv11once. - Mono is reserved. JetBrains Mono only on labels, code, tool args, and numeric data — never body prose.
4. Component Stylings
Button — Primary
- Background:
var(--color-brand) - Text:
var(--color-text-on-brand) - Padding:
14px 20px - Radius:
standard(8px) - Font: Inter 14 / 500, tracking
-0.005em - Hover: background →
brand-hover. No scale, no glow, no translate. - Active: background →
brand-pressed. - Disabled: opacity
0.40, cursornot-allowed. - Use: hero CTA — Get AgentKit, Buy, Sign up.
Button — Ghost
- Background: transparent
- Text:
var(--color-text) - Padding:
14px 20px - Radius:
standard(8px) - Border:
1px solid var(--color-border-strong) - Hover: background →
bg-card-hover; border tightens totext-dim. - Use: secondary action paired with a primary CTA.
Button — Icon
- 36px square,
comfortableradius (12px),text-dimglyph. - Hover: background →
bg-card-hover, glyph →text. - Use: copy-to-clipboard, theme-switch (dev only), dismiss.
Card
- Background:
var(--color-bg-card) - Border:
1px solid var(--color-border) - Radius:
card(16px) - Padding:
24pxdefault,32pxfor featured tier. - Hover: background →
bg-card-hover. No translate. - No shadow on dark themes; on bright theme a subtle ambient-light shadow may be used (1px 2px at 6% opacity).
ChatHero (anchor component)
- Background:
bg-card - Border:
1px solid border - Radius:
card(16px) - Padding:
24px - Header:
Labelmono uppercase row at top — “AGENT • LIVE” — with brand dot. - Body: alternating message bubbles,
assistant-bg = bg-card,user-bg = bg-card-hover. - Streaming cursor:
▋glyph inbrandcolor withcursor-blink1s step-end animation, stops on stream end.
AgentTraceViewer (anchor component)
- Background:
bg-card - Radius:
card(16px) - Padding:
24px - Each step: numbered
01.,02., mono uppercase, with a collapse/expand chevron on the right. - Open state: Radix
accordion-downwith--radix-accordion-content-height, 200msease-standard.
ToolCallPanel (anchor component)
- Background:
bg-card - Border:
1px solid border - Radius:
card(16px) - 4 phases —
prompt→calling→result→final— each as a small card with mono-uppercase label and code-inline tool name. - Phase progression: each card slides in from below with 8px translate
and fades in over 240ms
ease-emphasized. Thecallingcard shows a spinningtext-dimLoadericon; theresultcard shows asuccesscheckmark.
MessageBubble
- User bubble:
bg-card-hover, right-aligned, max-width 80%. - Assistant bubble:
bg-card, left-aligned, max-width 100%. - Padding:
12px 16px, radius:comfortable(12px). - Code blocks inside: JetBrains Mono 13px on
bg-elevwithsmallradius.
ModelSelector
- Background:
bg-elev - Border:
1px solid border-strong - Radius:
standard(8px) - Trigger shows model logo + name + chevron; popover lists available
models with selected one in
brand.
Input
- Background:
bg-elev - Text:
text; placeholdertext-faint - Border:
1px solid border-strong - Padding:
12px 14px - Radius:
small(6px) - Focus: border →
border-brand-strong; ring0 0 0 2px brand-tint-strong.
Label
- Mono 11 / 500 / 0.15em / uppercase, color
text-dim. - 6px solid
branddot, 8px to the left of the text. - The rhythm anchor of every section.
Badge
- Background:
brand-tint - Text:
brand - Border:
1px solid border-brand - Mono 11 / 500 / 0.10em / uppercase, padding
3px 8px, radiusmicro(3px).
Em
- Instrument Serif italic 400, color
brand, inherits size and line-height from parent. - Used inside display headlines only.
5. Layout Principles
Spacing System
- Base unit:
4px. Scale:[0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 80, 96, 128, 160]. - Named:
xxs→xs→sm→md→lg→xl→xxl→section(64) →section-large(96) →section-hero(128).
Grid & Container
page-width(1200px) — the full marketing page.prose-width(800px) — long-form text columns.- Hero is
1fr 1frdesktop, single-column mobile. - Streaming feature row:
1.4fr 1fr(chat panel weighted larger). - Trace viewer feature row:
1fr 1fr. - Tool-call feature row:
1.4fr 1fr.
Whitespace Philosophy
Section rhythm uses --space-13 (128px) between major sections on
desktop; scales to --space-10 (64px) on mobile. Hero gets an extra
32px of top padding.
Section Cadence
Sections do not alternate light/dark bands. The page is a single ground tone with cards and elevation doing the visual layering. Section labels (mono uppercase + brand dot) mark “new section starts here”.
6. Shapes & Radius Scale
| Tier | Value | Use |
|---|---|---|
| none | 0px | Full-bleed dividers |
| micro | 3px | Badges, mono code highlights |
| small | 6px | Inputs, dropdowns |
| standard | 8px | Buttons, most interactive surfaces |
| comfortable | 12px | Message bubbles, FAQ rows |
| card | 16px | Content cards, ChatHero, TraceViewer |
| hero | 24px | Large hero panels, theme-preview tile |
| pill | 9999px | Toggle pills, status chips |
Pure-zero radius is forbidden except on full-bleed dividers. The mix
of 8px (functional) and 16px (card) gives the page calm
geometry without feeling Web-3 bubbly.
7. Depth & Elevation
| Level | Treatment | Use |
|---|---|---|
| 0 | flat — bg ground | Default |
| 1 | bg-elev | Sticky nav, input field |
| 2 | bg-card | Cards, anchor components |
| 3 | bg-card-hover | Hovered card |
| 4 | surface-overlay + blur | Modal scrim |
| 5 | shadow.modal + level-4 | Floating dialog |
Shadow Philosophy. Tonal stacking, not shadows. The 4-tier surface
scale provides implicit depth on every theme. Drop shadows are
reserved for floating UI primitives only — Tooltip, Popover, Toast,
Dialog. Cards use borders and surface elevation, not shadows. The
bright theme uses softer, lower-opacity black shadows; the dark
themes use higher-opacity neutral black.
8. Interaction & Motion
Easing
ease-standardcubic-bezier(0.4, 0, 0.2, 1)— default for hovers, state changes, and accordion.ease-emphasizedcubic-bezier(0.2, 0, 0, 1)— modal entrance, tool-call phase progression, page-level transitions.ease-deceleratecubic-bezier(0, 0, 0.2, 1)— incoming elements.ease-acceleratecubic-bezier(0.4, 0, 1, 1)— outgoing elements.
Durations
duration-instant80ms — micro-feedback (toggle thumb, copy acknowledgement).duration-fast150ms — button hover, link underline.duration-standard240ms — card hover, input focus ring, tool-call phase entrance.duration-slow320ms — modal entrance, theme swap fade.duration-slower480ms — page transitions, hero reveal.
Per-component micro-states
- Button hover — background tint shifts (
brand→brand-hover) over 150ms. No translate, no scale, no shadow. - Card hover — background
bg-card→bg-card-hoverover 240ms. - Link hover — decoration color
text-faint→brandover 150ms. - Input focus — ring fades in at 240ms with
ease-emphasized. - Accordion (TraceViewer) — Radix
accordion-down/accordion-upwith--radix-accordion-content-height, 240msease-standard. - Modal entrance — opacity 0 → 1 with translate-y 8px → 0 over
320ms
ease-emphasized. - Tool-call phase progression — each phase card opacity 0 → 1
with translate-y 8px → 0 over 240ms
ease-emphasized. Phases advance every 800 – 1200ms during the loop. - Streaming cursor —
cursor-blink1sstep-endinfinite. Stops on stream end (visibility goeshidden). - Theme swap — when
data-themechanges,<html>transitionsbackground-colorandcolorover 320msease-standard.
Page transitions
The kit ships without view-transitions; each page loads independently. Adopters can opt in via Next 16 view-transitions where appropriate.
Reduced motion
Honored at the root via prefers-reduced-motion: reduce. All
non-essential transitions become opacity-only at 80ms. The
streaming cursor-blink is replaced with a static brand-colored
caret. Tool-call phase entrances render instantly with no slide-in.
Theme swap snaps without transition.
9. Accessibility & A11y
Contrast
| Pair | dark | bright | cool-blue |
|---|---|---|---|
| text on bg | 14.6 (AAA) | 17.5 (AAA) | 14.0 (AAA) |
| text-dim on bg | 5.9 (AA) | 7.4 (AAA) | 5.6 (AA) |
| text-on-brand on brand | 13.2 (AAA) | 4.7 (AA) | 11.8 (AAA) |
| brand on bg | 14.1 (AAA) | 4.5 (AA) | 6.5 (AA) |
The bright theme is tuned so emerald #16a34a clears AA at body
sizes against #fafafa; for AAA on small text, fall back to
brand-deep (#14532d).
Focus indicators
A 2px solid var(--color-focus-ring) ring with 2px offset wraps
every interactive element. Uses :focus-visible so the ring only
appears on keyboard focus.
ARIA patterns
- ChatHero streams: outer container is
aria-live="polite" aria-busy={isStreaming}; finished messages are not announced again. - AgentTraceViewer uses Radix
Accordionsemantics; each step trigger is a<button>with properaria-expanded. - ToolCallPanel phase changes are announced via a hidden
aria-live="polite"region: “Tool call: search_web. Phase: result.” - ModelSelector uses Radix
Select(combobox pattern, WAI-ARIA 1.2). - Theme switcher (dev mode) uses Radix
ToggleGroup.
Keyboard nav
Tab order matches DOM order. The <ChatHero> chat input is
focusable and has aria-label="Send a message to the agent".
The theme switcher is excluded from production tab order.
Reduced motion
See §8. The streaming cursor and tool-call phase animation are the two motion-heavy elements; both fall back to a static state under reduced motion.
Screen reader
Streaming chat output is announced incrementally via aria-live.
<Label> rows next to a heading are aria-hidden. Icon-only buttons
carry aria-label.
Sizes
Minimum text size is 12px (caption). Touch targets meet the 44px
minimum on mobile; chat input field is 48px height.
10. Responsive Behavior
| Breakpoint | Width | Anchor |
|---|---|---|
| mobile | <480 | Single column, hero 48px |
| tablet | 480 – 768 | Single column, hero 56px |
| laptop | 768 – 1024 | Two-column where helpful, hero 64px |
| desktop | 1024 – 1280 | Full grids, hero 72px |
| wide | ≥1280 | Page-width capped at 1200 |
Touch targets
44px minimum across mobile and tablet. Chat input is 48px.
Collapsing strategy
- Hero
1fr 1fr→ stacks to single-column at <768px. - ChatHero feature row
1.4fr 1fr→ stacks at <1024px with chat above prose. - TraceViewer
1fr 1fr→ stacks at <1024px. - ToolCallPanel
1.4fr 1fr→ stacks at <1024px. - Pricing 3-up → 2-up at <1024px → 1-up at <640px.
Image behavior
Theme-preview tiles use aspect-ratio: 4/3 with object-fit: cover
inside a bg-card plate.
Container queries
Used on <MessageBubble> so user-bubble width adapts when the chat
panel is in a sidebar vs full-width context.
11. Content & Voice
Tone
Technical, calm, agent-aware. AgentKit writes for the developer shipping their first agent product. Headlines are imperative and ground-truthed. Adjectives are sparse; verbs are specific. Sample hero: “Ship your AI agent’s landing page this afternoon. 65 components. 9 sections. Three swappable themes. One install.”
Microcopy patterns
- Buttons use verbs. Get AgentKit, Buy, View source, Read the docs, Try the demo.
- Errors describe the cause. “OPENAI_API_KEY missing. Add it to
.env.localand restart.” - Success is quiet. “Theme set to bright.” — not “Your theme preference has been successfully updated!”
- Empty states explain how to fill them. “No messages yet. Type below to ping the agent.”
CTA verb conventions
- Primary: Get AgentKit, Buy, Sign up, Try the demo.
- Secondary: View source, Read the docs, See examples.
- Tertiary (link): Learn more, Browse components, See all.
The kit avoids: Click here, Submit, Get started for free, Transform your business.
12. Dark Mode & Theming
AgentKit is theme-first. Three themes ship by default —
editorial-dark (default), bright (light), and cool-blue
(slate). Theme is selected via a data-theme attribute on <html>
and persisted in localStorage as agentkit:theme. An inline
script in <head> reads the stored value and applies it
synchronously before paint to prevent FOUC:
<script>
try {
var t = localStorage.getItem('agentkit:theme') || 'editorial-dark';
document.documentElement.setAttribute('data-theme', t);
document.documentElement.style.colorScheme = t === 'bright' ? 'light' : 'dark';
} catch (e) {}
</script>CSS variables are declared per theme inside :root[data-theme="..."]
selectors using Tailwind 4’s @theme directive. Components reference
var(--color-*) tokens only — never hex literals — so swapping
themes is a single attribute change with zero component rewrites.
When a developer ships AgentKit in production, they typically pick one theme and remove the dev-only theme switcher from their build. The system supports all three at runtime, but production sites usually commit to one identity.
System preference
prefers-color-scheme is read on first load. Users on a light OS
default to bright; users on a dark OS default to editorial-dark.
Stored preference always wins over system preference.
13. Lineage & Influences
AgentKit extends webdesignhot’s editorial-dark canvas into a three-theme system inspired by Vercel’s Geist (themed but locked to a single component library) and Linear’s spatial restraint. The chat-hero + agent-trace-viewer + tool-call-panel anchor components are the kit’s own contribution — there’s no reference for “agent product landing page” yet, so the kit defines the genre. The cool-blue theme borrows its palette discipline from Stripe (deep navy + cyan accent) for fintech-adjacent products; the bright theme tracks Resend’s clean daylight feel. Type system is unchanged across themes — only color swaps — proving that hierarchy comes from size and tracking, not hue.
What it rejects: gradient hero backgrounds, glow shadows, illustrated 3D agent mascots, “AI sparkles” iconography, multi-accent palettes, 600+ display weights, marketing pages that don’t show the product.
Named influences
- webdesignhot — source canvas, type voices, em-as-token rule.
- Vercel Geist — themed but unified component library pattern.
- Linear — spatial restraint, dense agent-product surfaces.
- Stripe — cool-blue palette discipline (fintech-grade calm).
- Resend — bright theme’s daylight clarity.
- Anthropic — editorial calm, mono-with-dot section rhythm.
- Rauno Freiberg — italic-serif
<em>accents.
14. Do’s and Don’ts
Do
- Pick one theme before shipping production.
- Use
<em>for italic-serif accents inside display headlines. - Reference colors via
var(--color-*)only — never hex literals. - Keep
<Label>mono uppercase + brand dot at every section. - Use the supplied keyframes (
accordion-down,accordion-up,cursor-blink,fade-in-up). - Apply theme via
data-themesynchronously in<head>to prevent FOUC. - Use
text-on-brand(theme-aware) on the brand CTA — never default to white or black. - Honor
prefers-reduced-motioneverywhere. - Use
:focus-visibleso the focus ring only appears on keyboard nav. - Cap chat-message width at 80% so messages remain scannable.
Don’t
- Introduce a second accent color per theme.
- Use
brandas a gradient or glow — solid fill only. box-shadowcards for depth — usebg-card-hoverandborder-stronginstead.- Hard-code hex values in components — always
var(--color-token). - Ship with the theme switcher visible to your end users.
- Use bold (
700+) weights on display type. - Translate or scale buttons on hover — color-only state changes.
- Use
<em>for grammatical emphasis — it’s a design token. - Mix tokens between themes (e.g. dark text on bright background).
- Skip the streaming-cursor stop logic — the caret must disappear the moment the agent finishes speaking.
15. Agent Prompt Guide
Quick Color Reference (editorial-dark default)
bg: #0a0a0a
text: #ededed
text-dim: #8a8a8a
brand: #c6f432
text-on-brand:#0a0a0a
bg-card: #141416
border: rgba(255,255,255,0.08)
focus-ring: #c6f432Bright theme
bg: #fafafa | text: #0a0a0a | brand: #16a34a | text-on-brand: #fffCool-blue theme
bg: #0b1120 | text: #f1f5f9 | brand: #06b6d4 | text-on-brand: #0b1120Example Component Prompts
-
“Create an AgentKit ChatHero in the editorial-dark theme:
#141416background, 16px radius, 24px padding, 1pxrgba(255,255,255,0.08)border. Header is a mono uppercase row ‘AGENT • LIVE’ with a 6px#c6f432dot. Below, alternating message bubbles — assistant on#141416left-aligned, user on#1a1a1cright-aligned, both 12px radius. Streaming cursor is a#c6f432▋glyph blinking at 1s step-end.” -
“Build an AgentTraceViewer card:
bg-cardbackground, 16px radius, 24px padding. Each step starts with a mono uppercase01.label intext-dim, the step title in 22px Inter / 500. Steps expand via Radix accordion with--radix-accordion-content-heightover 240msease-standard. Inside an open step, render tool-call rows with mono code-inline for tool name and args.” -
“Compose a ToolCallPanel with 4 phases — prompt, calling, result, final — each as a small card with mono uppercase phase label and code-inline tool name. Phase progression slides each card in from below with 8px translate over 240ms
ease-emphasized. Calling shows a spinningtext-dimLoader; result shows asuccesscheckmark.” -
“Design a primary button in the bright theme:
#16a34abackground, white text, 14px Inter / 500, 14/20px padding, 8px radius. Hover lightens to#15913fover 150ms — no scale, no glow.” -
“Build a theme-preview row showing the same hero in all three themes side-by-side: each tile is 4/3 aspect,
card(16px) radius, 1px theme-appropriate border, with a mono uppercase label below the tile naming the theme. Tiles render the same ChatHero component — only colors differ.” -
“Create a section anchor: 64px section padding, mono uppercase label ‘03 — TRACE VIEWER’ in
text-dim11/500/0.15em with brand dot, a 40px Inter / 500 / -0.025 tracking headline below, and an optional Instrument Serif italic<em>accent inside the headline.”
Iteration Guide
- Pick the default theme first. Do all your composition in
editorial-darkuntil the layout reads correctly. Only after the structure is solid, swap tobrightandcool-blueand tune contrast. - Reference variables only. If you find yourself writing
#c6f432in a component, replace it withvar(--color-brand)immediately. The single discipline that makes the kit work. - Hold the accent in reserve. Don’t introduce the brand color until the layout reads correctly without it. The accent should arrive as a deliberate moment.
- Build the anchor components first. ChatHero, AgentTraceViewer, and ToolCallPanel are what differentiate the kit. Compose sections around them, not the other way around.
- Use
<em>once per hero. Place exactly one Instrument Serif italic accent inside the display headline. Test that removing it flattens the page; test that adding a second one fights for attention. - Apply the theme synchronously. Read
localStorageand setdata-themeon<html>in an inline<head>script before first paint. FOUC is the most common single mistake when shipping multi-theme. - Stop the streaming cursor. The most common bug: the
▋keeps blinking after the stream ends. WireisStreaming === falsetovisibility: hiddenon the cursor. - Audit accent count per theme. When you’re done, count every
var(--color-brand)reference. If it’s above ~8 per page, remove the weakest two. The kit is at its strongest when the accent is rare on every theme.
Drop agentkit into your project, then ship the actual sections in an afternoon.
1 · install design
npx design-md add agentkit 2 · ship landing page
npx agentkit init --design agentkit dark editorial
webdesignhot
AI-era editorial dark — pure black with one acid-lime accent.
Docs
Install
webdesignhot
webdesignhot
light minimal
Vercel
Brutalist developer-product polish — near-white canvas, near-pure black-on-near-white ty…
Docs
Install
Vercel
webdesignhot
dark minimal
Linear
Dark-canvas product surface — pure-black ground, indigo accent, custom Inter weights, pi…
Docs
Install
Linear
webdesignhot