Design System Inspiration of Heydealer

1. Visual Theme & Atmosphere

Heydealer (헤이딜러) is the used-car platform of (주)피알앤디컴퍼니 (PRND Company), whose careers site lists 박진우 as chief executive and a head office in Seocho, Seoul. According to 매일경제 (2018-07-16), 박진우 — then on leave from Seoul National University — built Heydealer in early 2015 as an online market where dealers compete to buy a car its owner registers, and it passed ₩30 billion in cumulative deals within a year. In January 2016 a proposed amendment to the Automobile Management Act would have required online auction companies to run offline premises, a 3,300 m² car park and a 200 m² auction room, which pushed the company toward closure; the same article reports the law was changed after the paper's coverage and headlines Heydealer's ₩500 billion in cumulative deals once the rule was eased. Today the site describes three services in its own words: 내차팔기 through a top-price auction among 11,000 dealers nationwide, certified used cars with a one-year free warranty, and a car's price and 19-item accident and flood history from its number plate. PRND's careers site states the mission as "아무도 바꾸지 못한 중고차 시장을 혁신합니다".

The captured pages — www.heydealer.com, the /market/cars listing and the /sell page — read as a dense, flat product tool. The page is white #ffffff with near-black #0c0d11 text, and one saturated blue, #396eff, appears only where the next step is: the count-and-보기 action on home, 10초 만에 확인 on /sell and the highlighted sale-step card. Everything else sits in a slate-tinted neutral system: 8% slate fills (rgba(97, 113, 159, 0.08)) for selects, the search trigger and checked chips; 16% slate borders for chips and cards; a 60% navy (rgba(38, 55, 97, 0.6)) for inactive navigation. A 4px radius covers almost every control; 8px article cards, a 16px switch and a 100px chat pill are the only softer shapes.

Type is Spoqa Han Sans Neo, self-hosted on static.web.heydealer.com, in Regular and Bold. Bold headings track tight (-0.195px at 15px up to -1.008px at 36px), while 12–13px text opens slightly (0.078px, 0.12px).

Key Characteristics:

• One saturated blue, #396eff, on the primary action and nowhere decorative
• Near-black #0c0d11 text on white; #000000 for a few home headings and the checked-chip border
• A slate-tinted neutral system: 8% fills, 16% borders, 60% navy for inactive navigation
• A 4px radius on buttons, selects, chips, cards and menus
• Spoqa Han Sans Neo 400 / 700 with size-scaled tracking
• Flat listings; soft shadows only on the floating chat button, the dropdown menu and the /sell cards
• A near-black #101115 warranty banner as the one dark block on /market/cars

Primary tasks

• Sell your car by letting dealers bid for it in a 48-hour auction.
• Find a certified used car by brand, type and model.
• Filter the listing by year, mileage, price, fuel and accident history.
• Check a car's price and hidden history from its number plate.
• Get a scrap-car quote.

2. Color Palette & Roles

Every token below was read by the deterministic collector on 2026-09-30 from www.heydealer.com, www.heydealer.com/market/cars and www.heydealer.com/sell.

Primary

• Heydealer Blue (#396eff): The fill of the primary action. It is the primary because the captured pages render it in that role: the count-and-보기 action under the car selects on home (132 × 56) and 10초 만에 확인 on /sell (280 × 52) both compute backgroundColor: rgb(57, 110, 255), and it is the only saturated action fill on the three pages. The highlighted sale-step card on /sell uses the same blue.
• On Primary (#ffffff): Labels on the blue actions and text on the highlighted step card.

Neutral & Surface

• Canvas (#ffffff): The page background (body), cards, menus and the chat button.
• Dark (#101115): The 모든 차 1년 무료 보증 banner on /market/cars.
• Translucent values stay in component fields: the slate fill rgba(97, 113, 159, 0.08), the slate border rgba(97, 113, 159, 0.16) and the inactive-navigation navy rgba(38, 55, 97, 0.6).

Text

• Ink (#0c0d11): Body text, headings, chips and selects.
• Black (#000000): The 18px and 20px home headings (헤이딜러가 인증 했어요, 타 본 사람들 이야기), car names in the review strip, the checked radio-chip border and the switch track.
• The switch sets its text colour to #f7f8fb.

Brand assets, not tokens

• The Heydealer logo was not measured, and no logo colour is a token here.

3. Typography Rules

Font Family

• Live surface use: spoqaHanSansNeo (771 observed uses), served from static.web.heydealer.com/_next/static/media/ (SpoqaHanSansNeo_Regular.*.woff2 and its sibling weights). The survey's document.fonts list shows weights 400, 500 and 700 loaded. The stack continues "Spoqa Han Sans Neo Fallback", -apple-system, "Apple Color Emoji", TossFace, system-ui, sans-serif.
• Official product use: no Heydealer-owned typeface; the product text is set in Spoqa Han Sans Neo, self-hosted.
• Licence: Spoqa Han Sans Neo is Spoqa's open-source family, licensed under the SIL Open Font License, Version 1.1 (its LICENSE file, opened 2026-09-30).
• Declared only (no visible use): Inter (inter-latin-700-normal.*.woff2 on the same host — the browser loaded it, but no captured element renders it), TossFace (a flag-emoji subset) and Spoqa Han Sans Neo Fallback (a fallback name with no file). No token, no specimen.
• Unresolved: none.

Hierarchy

Principles

• Weight carries the structure: headings, navigation and the primary label are Bold 700; reading text is Regular 400.
• Tracking scales with size: tight at 15px and above, slightly open at 12–13px.
• One family: Spoqa Han Sans Neo runs from 36px headings to 12px notes.

4. Component Stylings

Buttons

Primary button

• Background: #396eff
• Text: #ffffff
• Radius: 4px
• Padding: 0px 24px
• Height: 56px on home, 52px on /sell
• Font: 15px / 700 / 22px Spoqa Han Sans Neo, tracking -0.195px
• States: rest only; no hover or pressed value was recorded
• Use: the count-and-보기 action under the car selects on home, 10초 만에 확인 on /sell

Small outlined button

• Background: transparent
• Text: #0c0d11
• Border: 1px solid rgba(97, 113, 159, 0.16)
• Radius: 4px
• Padding: 0px 12px
• Height: 40px
• Font: 13px / 400 / 18px Spoqa Han Sans Neo, tracking 0.078px
• Use: 판매과정 더 자세히 on /sell and its sibling on home

Chat button

• Background: #ffffff
• Text: #0c0d11
• Radius: 100px
• Padding: 8px 16px 8px 8px
• Height: 56px
• Shadow: rgba(0, 0, 0, 0.12) 0px 2px 8px 0px
• Use: 채팅 문의, floating on /market/cars

Inputs & Selects

Car select

• Background: rgba(97, 113, 159, 0.08)
• Text: #0c0d11
• Border: 1px solid transparent
• Radius: 4px
• Padding: 16px 24px
• Height: 56px
• Font: 16px / 400 Spoqa Han Sans Neo
• Disabled: 차종 선택 and 모델 선택 stay disabled until a brand is chosen, with the same computed fill and text
• Use: 브랜드 전체, 차종 선택, 모델 선택 on home; 브랜드 전체 opens the brand menu

Search trigger

• Background: rgba(97, 113, 159, 0.08)
• Text: #0c0d11
• Radius: 4px
• Padding: 0px 16px
• Height: 52px
• Font: 16px / 400 Spoqa Han Sans Neo
• Use: 모델을 입력해주세요. in the header

Switch

• Background: #000000
• Text colour: #f7f8fb
• Radius: 16px
• Size: 30 × 18
• Use: the switch in the /market/cars filter bar

Chips

Filter chip

• Background: transparent
• Text: #0c0d11
• Border: 1px solid rgba(97, 113, 159, 0.16)
• Radius: 4px
• Padding: 8px 12px
• Height: 36px
• Font: 16px / 400 Spoqa Han Sans Neo
• Use: 전체 필터, eye 인증, 할인 중, 연식, 주행거리, 가격 and the other filters on /market/cars

Radio chip

• Background: transparent
• Text: #0c0d11
• Border: 1px solid rgba(97, 113, 159, 0.16)
• Radius: 4px
• Padding: 8px 12px
• Height: 36px
• Checked: background rgba(97, 113, 159, 0.08) and a 1px solid #000000 border
• Use: the role=radio chip row on home

Navigation

Header navigation

• Background: transparent
• Text: rgba(38, 55, 97, 0.6)
• Radius: 4px
• Padding: 8px
• Height: 38px
• Font: 15px / 700 / 22px Spoqa Han Sans Neo, tracking -0.195px
• Selected: text #0c0d11 on the current section
• Use: 내차사기, 내차팔기, 폐차 견적받기, 중고차 숨은 이력

Brand menu

• Background: #ffffff
• Radius: 4px
• Padding: 8px 0px 8px 8px
• Shadow: rgba(0, 0, 0, 0.08) 0px 16px 20px 0px, rgba(0, 0, 0, 0.04) 0px 8px 16px 0px, rgba(0, 0, 0, 0.04) 0px 0px 8px 0px
• Use: opened from 브랜드 전체, 240 × 429, with 224 × 38 items (8px 12px padding, 4px radius)

Cards & Containers

Sale-step card

• Background: #ffffff
• Radius: 4px
• Size: 200 × 280
• Shadow: rgba(0, 0, 0, 0.08) 0px 16px 20px 0px, rgba(0, 0, 0, 0.04) 0px 8px 16px 0px, rgba(0, 0, 0, 0.04) 0px 0px 8px 0px
• Highlighted: background #396eff, text #ffffff, 24px padding
• Use: 집 앞, 방문 평가 / 48시간 경매 / 최고가에 판매결정 on /sell

Review card

• Background: #ffffff
• Border: 1px solid rgba(97, 113, 159, 0.16)
• Radius: 4px
• Padding: 16px
• Size: 304 × 256
• Shadow: rgba(0, 0, 0, 0.03) 0px 4px 2px 0px
• Use: 판매후기 on /sell

Warranty banner

• Background: #101115
• Radius: 4px
• Size: 248 × 100
• Use: 모든 차 1년 무료 보증 at the top of /market/cars

FAQ row

• Background: transparent
• Text: #0c0d11
• Padding: 12px 0px
• Height: 48px
• Font: 18.72px / 700, the browser's default h3 size
• Use: 자주 묻는 질문 on /sell

The listing cards on home (220 × 224 anchors) keep their text in children that were not captured; their anchor colour reads the browser default, so no card text colour is claimed.

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Verified: 2026-09-30 (deterministic collector capture of three public pages of www.heydealer.com, logged out, plus first-party company pages and one Korean press article) Tier 1 sources: https://www.heydealer.com/ ; https://www.heydealer.com/market/cars ; https://www.heydealer.com/sell ; https://www.prnd.co.kr/ko/home ; https://www.prnd.co.kr/ko/life ; https://www.heydealer.com/blog Tier 2 sources: getdesign.md/heydealer (HTTP 200, the name does not appear on the page) and styles.refero.design/?q=heydealer (HTTP 200, the name appears only as the echoed query), requested 2026-09-30; no Tier 2 value used Conflicts unresolved: none

5. Layout Principles

Spacing System

• Buttons: 24px horizontal padding
• Selects: 16px 24px padding at 56px
• Chips: 8px 12px padding at 36px
• Review cards: 16px padding
• Menu items: 8px 12px padding at 38px

Grid & Container

• Home: a header with navigation and the search trigger, 모든 차량 with three selects and the blue action, then rows of listing cards (할인 중, eye 인증 차량, 오늘 가장 많이 조회된 차량), popular models and owner reviews.
• /market/cars: the warranty banner, a filter-chip bar with a switch, and the listing grid.
• /sell: a hero with the number-plate check and its blue action, three sale-step cards, an FAQ and a review carousel.

Whitespace Philosophy

• Dense but ordered: listing data sits close together, separated by 16% slate borders and 8% slate fills rather than by large gaps.
• The blue marks the next step: it appears once per view, on the action.

Border Radius Scale

• 4px: buttons, selects, chips, step and review cards, menus
• 8px: article cards on home
• 16px: the switch
• 100px: the chat button

6. Depth & Elevation

Shadow Philosophy: The listing surfaces are flat — chips, selects, buttons and listing cards compute box-shadow: none, and grouping comes from slate tints and borders. Shadows appear where something floats or is presented as a step: the brand menu, the /sell step and review cards, and the chat button.

7. Do's and Don'ts

Do

• Use #396eff for the one primary action in a view
• Set text in #0c0d11 on white
• Group with rgba(97, 113, 159, 0.08) fills and rgba(97, 113, 159, 0.16) borders
• Keep controls at a 4px radius
• Use Spoqa Han Sans Neo Bold 700 for headings and navigation, Regular 400 for reading
• Track tight at 15px and above (-0.195px at 15px) and slightly open at 12–13px

Don't

• Don't spread the blue to decoration or secondary actions
• Don't round controls into pills; only the chat button is one
• Don't put shadows on listing cards or chips
• Don't use a soft grey for body text
• Don't invent hover or pressed colours; none were recorded

8. Responsive Behavior

Breakpoints

Only the 1440 × 900 desktop viewport was captured; no breakpoint was measured.

Touch Targets

• Primary button: 56px on home, 52px on /sell
• Selects: 56px; search trigger: 52px
• Chips: 36px; header navigation: 38px
• Chat button: 56px

Collapsing Strategy

• Not measured.

Image Behavior

• Not measured.

9. Agent Prompt Guide

Quick Color Reference

• Primary action: #396eff, label #ffffff
• Text: #0c0d11; strong headings #000000
• Page and cards: #ffffff; dark banner #101115
• Slate fill rgba(97, 113, 159, 0.08); slate border rgba(97, 113, 159, 0.16); inactive nav rgba(38, 55, 97, 0.6)

Example Component Prompts

• "Create a Heydealer primary button: #396eff background, #ffffff 15px Spoqa Han Sans Neo Bold label with -0.195px tracking, 0 24px padding, 56px tall, 4px radius, no shadow."
• "Build a car select: rgba(97, 113, 159, 0.08) fill, #0c0d11 16px label, 16px 24px padding, 56px tall, 4px radius."
• "Make a filter chip row: transparent chips with a 1px rgba(97, 113, 159, 0.16) border, 8px 12px padding, 36px tall, 4px radius; a checked chip takes the slate fill and a 1px #000000 border."
• "Create header navigation: 15px Bold labels in rgba(38, 55, 97, 0.6), the current section in #0c0d11, 8px padding, 4px radius."

Iteration Guide

1. One blue action per view, #396eff
2. #0c0d11 text, white page
3. Slate 8% fills and 16% borders do the grouping
4. 4px everywhere; 100px only for the chat button
5. Spoqa Han Sans Neo Bold for structure, Regular for reading
6. Shadows only for floating things and the /sell cards

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10. Voice & Tone

Heydealer's copy is plain, concrete and reassuring: it states guarantees and numbers instead of adjectives, and keeps actions short.

Voice samples (verbatim, opened 2026-09-30):

• "헤이딜러가 선별했으니까, 모든 차량 무사고" — trust band on home and /market/cars.
• "최대 50개 견적, 최고가 그대로 내차팔기" — /sell hero.
• "먼저 구매한 8,236명이 남긴 후기" — home review heading.
• "아무도 바꾸지 못한 중고차 시장을 혁신합니다" — prnd.co.kr careers site.

Forbidden register: dealership pressure, vague superlatives in place of guarantees, hidden conditions, exclamation-heavy promotion.

11. Brand Narrative

Heydealer began as an online auction for sellers. 매일경제's 2018 account describes the 2015 model — an owner registers once and dealers compete to buy — and the growth that followed, ₩30 billion in cumulative deals in the first year. It also records the moment the model nearly ended: a January 2016 amendment that would have treated online auction companies as illegal unless they ran large offline lots. The law was changed, and the article's headline puts Heydealer's cumulative deals at ₩500 billion after the rule was eased.

PRND's careers site tells the rest in the company's own words. It frames the work as questions — "왜 중고차 사고 이력은 알기 어려울까?", "왜 중고차 거래는 항상 불안하지?" — and answers them with hidden-history checks, selling without unfair depreciation, and "세상에서 가장 믿을 만한 인증 중고차". Its stated working values are Break, Create and Drive. The same site lists a showroom in Yongin and a technical base in Incheon, and the company runs a consumer blog of car-buying guides at heydealer.com/blog.

On the captured pages that stance shows as restraint: a white page, one blue action, guarantees stated as short facts, and data laid out densely enough to compare.

12. Principles

1. The market should work for the owner. Dealers compete for the seller's car. UI implication: show competing offers and their numbers plainly.
2. Guarantees as facts. UI implication: state 1년 무료 보증 and 단순변심 무료 환불 as short lines, not badges full of adjectives.
3. One action, one colour. UI implication: keep #396eff for the next step.
4. Dense but calm. UI implication: group with slate tints and hairlines; keep shadows for floating elements. (An editorial reading of the captured pages, not a Heydealer statement.)
5. Weight carries the structure. UI implication: Bold 700 for what matters, Regular 400 for the rest.

13. Personas

Personas below are fictional archetypes informed by publicly observable Heydealer user segments (Korean owners selling used cars, used-car buyers), not individual people.

김민재, 33, 서울. Selling his first car before an upgrade. Distrusts haggling in person; checks the price from his number plate and lets dealers bid.

이서연, 41, 경기. Buying a certified used car for the family. Filters by accident history and cares most about the one-year warranty and free returns.

박준호, 28, 부산. Compares trims and prices across the listing, reading owner reviews before deciding.

14. States

Only these states were observed on the three captured pages; nothing else is specified here.

No hover, pressed or focus frame was recorded for any control, so those treatments are unmeasured rather than absent. Error, empty, loading and success states were not captured and are not described.

15. Motion & Easing

The collector reads computed style, not animation, so no duration or easing is measured. The home rows and the /sell reviews are carousels with previous and next controls, which shows motion exists without timing it. Treat motion as unspecified rather than borrowing values, and honour prefers-reduced-motion in any build.