:root {
  color-scheme: light;
  --ink: #092536;
  --ink-soft: #173b4d;
  --paper: #f7faf8;
  --surface: #ffffff;
  --mist: #e7eff0;
  --line: #9aafb5;
  --muted: #536a74;
  --cyan: #1ba9b8;
  --blue: #3879d9;
  --orange: #f06436;
  --violet: #7359c8;
  --lime: #7ca62c;
  --slate: #4f6b78;
  --display: "Arial Narrow", "Avenir Next Condensed", "Pretendard", sans-serif;
  --body: "Avenir Next", "Pretendard", "Apple SD Gothic Neo", sans-serif;
  --mono: "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--body); line-height: 1.65; }
a { color: inherit; text-underline-offset: 0.22em; }
a:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }

.skip-link { position: fixed; z-index: 20; top: 12px; left: 12px; transform: translateY(-160%); background: var(--ink); color: #fff; padding: 9px 14px; }
.skip-link:focus { transform: translateY(0); }

.site-header,
main,
.site-footer { width: min(1320px, calc(100% - 48px)); margin: 0 auto; }

.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 82px; border-bottom: 1px solid var(--line); }
.site-name { display: inline-flex; gap: 11px; align-items: center; font-weight: 780; text-decoration: none; }
.site-mark { width: 13px; height: 13px; background: var(--cyan); box-shadow: 7px 7px 0 var(--orange); }
.site-header nav { display: flex; gap: clamp(18px, 4vw, 48px); font-family: var(--mono); font-size: .74rem; letter-spacing: .05em; text-transform: uppercase; }
.site-header nav a { text-decoration: none; }
.site-header nav a:hover { color: var(--cyan); }

.hero { position: relative; display: grid; grid-template-columns: 34px minmax(0, 1fr) minmax(240px, 340px); gap: clamp(28px, 5vw, 72px); min-height: 720px; align-items: center; padding: 88px 0 96px; }
.hero-rail { align-self: stretch; display: flex; flex-direction: column; align-items: center; justify-content: space-between; width: 14px; margin-left: 6px; background: linear-gradient(var(--cyan), var(--blue) 35%, var(--violet) 65%, var(--orange)); }
.hero-rail span { width: 22px; height: 22px; border: 5px solid var(--paper); background: var(--ink); outline: 1px solid var(--ink); }
.kicker,
.section-label,
.case-domain,
.note-label { margin: 0; color: var(--cyan); font-family: var(--mono); font-size: .73rem; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }
.hero h1 { margin: 20px 0 34px; font-family: var(--display); font-size: clamp(4.2rem, 10.2vw, 9.4rem); font-stretch: condensed; font-weight: 850; letter-spacing: -.075em; line-height: .84; }
.hero h1 em { color: transparent; font-style: normal; -webkit-text-stroke: 2px var(--ink); }
.hero-summary { max-width: 780px; margin: 0; color: var(--ink-soft); font-size: clamp(1.08rem, 1.8vw, 1.38rem); }
.hero-note { align-self: end; border-top: 4px solid var(--orange); background: var(--ink); color: #fff; padding: 24px; }
.hero-note .note-label { color: #65d6de; }
.hero-note p:last-child { margin: 22px 0 0; font-size: 1rem; }

.overview { display: grid; grid-template-columns: minmax(0, .85fr) minmax(300px, 1.15fr); gap: clamp(40px, 8vw, 120px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 80px 0; }
.overview h2,
.section-heading h2,
.public-product h2 { margin: 12px 0 0; font-family: var(--display); font-size: clamp(2.5rem, 5vw, 5.4rem); letter-spacing: -.055em; line-height: .95; }
.overview > p { max-width: 720px; margin: 0; color: var(--ink-soft); font-size: 1.16rem; }

.work { padding: 112px 0 70px; }
.section-heading { display: grid; grid-template-columns: 1fr 2fr; align-items: end; margin-bottom: 54px; }
.section-heading h2 { grid-column: 2; }
.section-heading .section-label { grid-column: 1; grid-row: 1; }

.case { --accent: var(--cyan); position: relative; display: grid; grid-template-columns: 34px minmax(240px, 1.1fr) minmax(180px, .72fr) minmax(240px, 1fr); gap: clamp(22px, 4vw, 58px); border-top: 1px solid var(--line); padding: 52px 0 44px; }
.case-cyan { --accent: var(--cyan); }
.case-blue { --accent: var(--blue); }
.case-orange { --accent: var(--orange); }
.case-violet { --accent: var(--violet); }
.case-lime { --accent: var(--lime); }
.case-slate { --accent: var(--slate); border-bottom: 1px solid var(--line); }
.case-signal { position: relative; }
.case-signal::before { position: absolute; top: -53px; bottom: -45px; left: 11px; width: 2px; background: var(--mist); content: ""; }
.case-signal span { position: relative; z-index: 1; display: block; width: 24px; height: 24px; border: 5px solid var(--paper); background: var(--accent); outline: 1px solid var(--accent); }
.case header { padding-right: 10px; }
.case-domain { color: var(--accent); }
.case h3 { margin: 15px 0 0; font-family: var(--display); font-size: clamp(2rem, 3.5vw, 4rem); letter-spacing: -.055em; line-height: .96; }
.case h4 { margin: 0 0 12px; font-family: var(--mono); font-size: .73rem; letter-spacing: .08em; text-transform: uppercase; }
.case-purpose p,
.case-build ul { margin: 0; color: var(--ink-soft); }
.case-build { grid-column: 4; }
.case-build ul { padding-left: 1.1em; }
.case-build li + li { margin-top: 8px; }
.case-outcome { grid-column: 2 / -1; display: grid; grid-template-columns: minmax(100px, .35fr) 2.65fr; gap: 28px; margin-top: 8px; border-left: 5px solid var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--surface)); padding: 20px 24px; }
.case-outcome span { color: var(--accent); font-family: var(--mono); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.case-outcome p { margin: 0; font-weight: 630; }

.principles { padding: 110px 0; }
.principle-list { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principle-list article { min-height: 300px; padding: 34px; }
.principle-list article + article { border-left: 1px solid var(--line); }
.principle-list strong { color: var(--cyan); font-family: var(--mono); font-size: .74rem; }
.principle-list h3 { margin: 64px 0 16px; font-family: var(--display); font-size: 2rem; letter-spacing: -.04em; }
.principle-list p { margin: 0; color: var(--muted); }

.project-index { padding: 0 0 110px; }
.project-index-list { border-top: 1px solid var(--line); }
.project-index-list > a { position: relative; display: grid; grid-template-columns: minmax(150px, .45fr) minmax(250px, .9fr) minmax(300px, 1.2fr) 42px; gap: 28px; align-items: center; border-bottom: 1px solid var(--line); padding: 30px 8px; text-decoration: none; }
.project-index-list > a:hover { background: var(--mist); }
.project-state { color: var(--orange); font-family: var(--mono); font-size: .69rem; font-weight: 750; letter-spacing: .07em; text-transform: uppercase; }
.project-index-list strong { font-family: var(--display); font-size: clamp(1.7rem, 3vw, 3.1rem); letter-spacing: -.04em; }
.project-index-list p { margin: 0; color: var(--muted); }
.project-arrow { justify-self: end; color: var(--cyan); font-size: 1.8rem; }

.public-product { display: grid; grid-template-columns: 150px 1fr auto; gap: clamp(28px, 5vw, 72px); align-items: center; margin-bottom: 110px; background: var(--ink); color: #fff; padding: clamp(32px, 6vw, 72px); }
.product-wordmark { display: grid; place-items: center; width: 130px; height: 130px; border: 2px solid #69d2db; color: #69d2db; font-family: var(--display); font-size: 4.2rem; font-weight: 850; letter-spacing: -.08em; }
.public-product .section-label { color: #69d2db; }
.public-product h2 { font-size: clamp(2.8rem, 5vw, 5rem); }
.public-product p { max-width: 670px; color: #c5d6dc; }
.public-product > a { border-bottom: 2px solid var(--orange); font-weight: 750; padding: 8px 0; text-decoration: none; }

.site-footer { display: flex; flex-wrap: wrap; gap: 26px; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; padding: 28px 0 44px; }
.site-footer p { margin: 0 auto 0 0; }
.site-footer nav { display: flex; gap: 22px; }

/* Public case studies */
.case-study-page { --study-accent: var(--cyan); }
.iap-study { --study-accent: var(--orange); }
.study-main { padding-top: 0; }
.study-hero { position: relative; min-height: 760px; border-bottom: 1px solid var(--line); padding: 86px 0 78px 18%; }
.study-hero::before { position: absolute; top: 86px; bottom: 78px; left: 6%; width: 7px; background: var(--study-accent); box-shadow: 14px 0 0 var(--ink); content: ""; }
.study-status { display: inline-flex; gap: 10px; align-items: center; margin-bottom: 80px; border: 1px solid var(--line); font-family: var(--mono); font-size: .7rem; font-weight: 700; letter-spacing: .07em; padding: 8px 11px; text-transform: uppercase; }
.study-status span { width: 8px; height: 8px; background: var(--orange); }
.study-hero .kicker { color: var(--study-accent); }
.study-hero h1 { max-width: 1000px; margin: 18px 0 34px; font-family: var(--display); font-size: clamp(4.8rem, 11vw, 10.5rem); font-weight: 860; letter-spacing: -.075em; line-height: .78; }
.study-thesis { max-width: 780px; margin: 0; color: var(--ink-soft); font-size: clamp(1.1rem, 1.8vw, 1.42rem); }
.study-facts { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 1040px; margin-top: 70px; border-top: 1px solid var(--line); }
.study-facts > div { padding: 18px 20px 0 0; }
.study-facts span,
.study-facts strong { display: block; }
.study-facts span { color: var(--muted); font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.study-facts strong { margin-top: 7px; font-size: .85rem; }

.study-problem { display: grid; grid-template-columns: .45fr 1.25fr 1fr; gap: clamp(30px, 6vw, 90px); border-bottom: 1px solid var(--line); padding: 110px 0; }
.study-problem h2 { margin: 0; font-family: var(--display); font-size: clamp(2.7rem, 5vw, 5.4rem); letter-spacing: -.055em; line-height: .94; }
.study-problem-copy p { margin: 0; color: var(--ink-soft); font-size: 1.06rem; }
.study-problem-copy p + p { margin-top: 24px; }

.study-system,
.store-flow { padding: 110px 0; }
.layer-list { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.layer-list article { min-height: 360px; padding: 30px; }
.layer-list article + article { border-left: 1px solid var(--line); }
.layer-list span { color: var(--study-accent); font-family: var(--mono); font-size: .71rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.layer-list h3 { margin: 90px 0 18px; font-family: var(--display); font-size: 2rem; letter-spacing: -.04em; line-height: 1; }
.layer-list p { margin: 0; color: var(--muted); }

.flow-track { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; padding-top: 58px; }
.flow-track::before { position: absolute; top: 72px; right: 12.5%; left: 12.5%; height: 3px; background: var(--orange); content: ""; }
.flow-track article { position: relative; z-index: 1; padding: 0 28px; text-align: center; }
.flow-track span { display: grid; place-items: center; width: 30px; height: 30px; margin: 0 auto 38px; border: 5px solid var(--paper); background: var(--ink); color: #fff; font-family: var(--mono); font-size: .62rem; outline: 2px solid var(--orange); }
.flow-track h3 { margin: 0 0 14px; font-family: var(--display); font-size: 2rem; }
.flow-track p { margin: 0; color: var(--muted); }

.study-outcomes { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(50px, 9vw, 130px); background: var(--ink); color: #fff; margin: 0 calc(50% - 50vw); padding: 100px max(24px, calc((100vw - 1320px) / 2)); }
.study-outcomes h2 { margin: 12px 0 0; font-family: var(--display); font-size: clamp(3rem, 6vw, 6.4rem); letter-spacing: -.06em; line-height: .9; }
.outcome-list article { display: grid; grid-template-columns: .7fr 1.3fr; gap: 28px; border-top: 1px solid #49616d; padding: 26px 0; }
.outcome-list article:last-child { border-bottom: 1px solid #49616d; }
.outcome-list strong { color: #74d8df; font-family: var(--display); font-size: 1.35rem; }
.iap-study .outcome-list strong { color: #ff9b76; }
.outcome-list p { margin: 0; color: #c5d6dc; }

.privacy-boundary { display: grid; grid-template-columns: .65fr 1.35fr; gap: 40px; margin: 90px 0; border: 1px solid var(--line); border-left: 7px solid var(--study-accent); padding: 28px; }
.privacy-boundary strong { font-family: var(--mono); font-size: .73rem; letter-spacing: .08em; text-transform: uppercase; }
.privacy-boundary p { margin: 0; color: var(--muted); }
.study-next { display: flex; justify-content: space-between; gap: 24px; border-top: 1px solid var(--line); padding: 32px 0 100px; }
.study-next a { font-weight: 750; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 22px 1fr; min-height: 0; }
  .hero-note { grid-column: 2; max-width: 520px; }
  .overview { grid-template-columns: 1fr; }
  .section-heading { display: block; }
  .case { grid-template-columns: 24px 1fr 1fr; }
  .case header { grid-column: 2 / -1; }
  .case-purpose { grid-column: 2; }
  .case-build { grid-column: 3; }
  .case-outcome { grid-column: 2 / -1; }
  .principle-list { grid-template-columns: 1fr; }
  .principle-list article { min-height: 0; }
  .principle-list article + article { border-top: 1px solid var(--line); border-left: 0; }
  .principle-list h3 { margin-top: 30px; }
  .public-product { grid-template-columns: 110px 1fr; }
  .product-wordmark { width: 100px; height: 100px; font-size: 3.2rem; }
  .public-product > a { grid-column: 2; justify-self: start; }
  .project-index-list > a { grid-template-columns: .5fr 1fr 42px; }
  .project-index-list p { grid-column: 2; }
  .project-arrow { grid-column: 3; grid-row: 1 / 3; }
  .study-hero { padding-left: 14%; }
  .study-facts { grid-template-columns: 1fr; }
  .study-facts > div { border-top: 1px solid var(--mist); padding: 14px 0; }
  .study-problem { grid-template-columns: 1fr 1.4fr; }
  .study-problem .section-label { grid-column: 1 / -1; }
  .layer-list { grid-template-columns: 1fr 1fr; }
  .layer-list article:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .layer-list article:nth-child(4) { border-top: 1px solid var(--line); }
  .flow-track { grid-template-columns: 1fr 1fr; gap: 42px 0; }
  .flow-track::before { display: none; }
  .study-outcomes { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .site-header,
  main,
  .site-footer { width: min(100% - 28px, 1320px); }
  .site-header nav a:not(:last-child) { display: none; }
  .hero { gap: 16px; padding: 60px 0 70px; }
  .hero h1 { font-size: clamp(3.25rem, 18vw, 5.8rem); }
  .hero h1 em { -webkit-text-stroke-width: 1px; }
  .overview { padding: 58px 0; }
  .work { padding-top: 78px; }
  .case { grid-template-columns: 18px 1fr; gap: 20px; }
  .case header,
  .case-purpose,
  .case-build,
  .case-outcome { grid-column: 2; }
  .case-build { margin-top: 8px; }
  .case-outcome { display: block; }
  .case-outcome p { margin-top: 8px; }
  .case-signal span { width: 18px; height: 18px; border-width: 4px; }
  .case-signal::before { left: 8px; }
  .principles { padding: 78px 0; }
  .public-product { grid-template-columns: 1fr; margin-bottom: 70px; }
  .public-product > a { grid-column: 1; }
  .project-index-list > a { display: block; padding: 26px 4px; }
  .project-index-list strong,
  .project-index-list p { display: block; margin-top: 10px; }
  .project-arrow { position: absolute; top: 26px; right: 4px; }
  .study-hero { min-height: 0; padding: 62px 0 70px 40px; }
  .study-hero::before { top: 62px; bottom: 70px; left: 6px; width: 5px; box-shadow: 10px 0 0 var(--ink); }
  .study-status { margin-bottom: 54px; }
  .study-hero h1 { font-size: clamp(4.2rem, 22vw, 6.7rem); }
  .study-problem { grid-template-columns: 1fr; padding: 75px 0; }
  .layer-list { grid-template-columns: 1fr; }
  .layer-list article { min-height: 0; }
  .layer-list article + article,
  .layer-list article:nth-child(3) { border-top: 1px solid var(--line); border-left: 0; }
  .layer-list h3 { margin-top: 40px; }
  .flow-track { grid-template-columns: 1fr; }
  .flow-track article { text-align: left; }
  .flow-track span { margin: 0 0 20px; }
  .outcome-list article { grid-template-columns: 1fr; gap: 8px; }
  .privacy-boundary { grid-template-columns: 1fr; }
  .study-next { flex-direction: column; }
  .site-footer p { flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}