:root {
  --paper: #f3f0e8;
  --paper-deep: #e8e3d8;
  --ink: #171815;
  --muted: #686a62;
  --line: #cbc7bc;
  --accent: #9b3f2d;
  --accent-soft: #ead8d0;
  --white: #fbfaf6;
  --max: 1180px;
  --reading: 760px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 100% 0%, rgba(155,63,45,.055), transparent 28rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--accent); }

.wrap {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.site-header {
  padding: 25px 0 20px;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  letter-spacing: -.02em;
}

.brand-risu {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .07em;
}

.brand-institute {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 650;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  gap: 22px;
  font-size: .9rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
}

.nav a[aria-current="page"],
.nav a:hover { color: var(--ink); }

.hero {
  padding: clamp(78px, 12vw, 150px) 0 clamp(68px, 9vw, 112px);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font-size: .74rem;
  font-weight: 760;
  letter-spacing: .17em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 950px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3rem, 8vw, 7.3rem);
  font-weight: 500;
  line-height: .94;
  letter-spacing: -.055em;
}

.hero-copy {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
  gap: 56px;
  margin-top: 52px;
  align-items: end;
}

.hero-copy p {
  max-width: 720px;
  margin: 0;
  font-size: clamp(1.13rem, 2vw, 1.45rem);
  line-height: 1.55;
}

.hero-note {
  padding-left: 22px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem !important;
}

.section {
  padding: 76px 0;
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 36px;
  margin-bottom: 42px;
}

.section-kicker {
  margin: 0;
  color: var(--muted);
  font-size: .74rem;
  font-weight: 730;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.section-title {
  margin: 0;
  max-width: 780px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4.5vw, 4.4rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -.035em;
}

.work-card {
  display: grid;
  grid-template-columns: 1.4fr .6fr;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.work-main { padding: 36px 40px 40px 0; }
.work-meta {
  padding: 36px 0 40px 40px;
  border-left: 1px solid var(--line);
}

.work-label {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: .74rem;
  font-weight: 760;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.work-title {
  margin: 0 0 18px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 500;
  line-height: .96;
  letter-spacing: -.04em;
}

.work-question {
  max-width: 720px;
  margin: 0 0 20px;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.5;
}

.work-summary {
  max-width: 720px;
  color: var(--muted);
}

.arrow-link {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-top: 22px;
  font-weight: 700;
  text-decoration: none;
}

.meta-list {
  margin: 0;
  display: grid;
  gap: 22px;
}

.meta-list div {
  display: grid;
  gap: 5px;
}

.meta-list dt {
  color: var(--muted);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.meta-list dd { margin: 0; }

.status {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: rgba(255,255,255,.28);
  font-size: .8rem;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.principles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.principle {
  min-height: 190px;
  padding: 27px 24px 10px 0;
  border-right: 1px solid var(--line);
}

.principle:not(:first-child) { padding-left: 24px; }
.principle:last-child { border-right: 0; }

.principle-number {
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
}

.principle h3 {
  margin: 38px 0 10px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
  font-weight: 500;
}

.principle p {
  margin: 0;
  color: var(--muted);
  font-size: .92rem;
}

.page-hero {
  padding: 82px 0 64px;
  border-bottom: 1px solid var(--line);
}

.page-hero h1,
.spec-title {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 500;
  line-height: .96;
  letter-spacing: -.045em;
}

.page-lede {
  max-width: 760px;
  margin: 28px 0 0;
  font-size: 1.25rem;
  color: #353630;
}

.reading {
  width: min(calc(100% - 40px), var(--reading));
  margin: 0 auto;
}

.prose {
  padding: 64px 0 90px;
}

.prose h2 {
  margin: 54px 0 16px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.95rem;
  font-weight: 500;
  letter-spacing: -.02em;
}

.prose h3 {
  margin-top: 35px;
  font-size: 1rem;
  letter-spacing: .02em;
}

.prose p,
.prose li { font-size: 1.04rem; }

.prose p { margin: 0 0 18px; }

.prose ul {
  margin: 14px 0 24px;
  padding-left: 1.25rem;
}

.prose li { margin: 8px 0; }

.callout {
  margin: 30px 0;
  padding: 24px 26px;
  background: var(--paper-deep);
  border-left: 3px solid var(--accent);
}

.callout p:last-child { margin-bottom: 0; }

.identifier {
  overflow-wrap: anywhere;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .95rem;
}

.code-block {
  overflow-x: auto;
  margin: 22px 0;
  padding: 20px 22px;
  background: #20211e;
  color: #f4f0e8;
  border-radius: 2px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .88rem;
  line-height: 1.6;
  white-space: pre;
}

.definition {
  margin: 25px 0 35px;
  padding: 28px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.45rem, 3vw, 2.05rem) !important;
  line-height: 1.35;
}

.spec-grid {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 18px 30px;
  margin: 34px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.spec-grid dt {
  color: var(--muted);
  font-size: .73rem;
  font-weight: 720;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.spec-grid dd { margin: 0; }

.reference-list {
  display: grid;
  gap: 10px;
}

.site-footer {
  padding: 36px 0 54px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  color: var(--muted);
  font-size: .82rem;
}

.footer-brand {
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
}

.smallcaps {
  font-size: .72rem;
  font-weight: 730;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.not-found {
  min-height: 70vh;
  display: grid;
  align-items: center;
}

@media (max-width: 760px) {
  .wrap, .reading { width: min(calc(100% - 30px), var(--max)); }
  .brand-institute { display: none; }
  .nav { gap: 14px; }
  .hero { padding-top: 74px; }
  .hero h1 { font-size: clamp(3.15rem, 16vw, 5.6rem); }
  .hero-copy,
  .section-head,
  .work-card,
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .hero-copy { gap: 28px; }
  .hero-note { max-width: 460px; }
  .section-head { gap: 16px; }
  .work-main { padding-right: 0; }
  .work-meta {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
  }
  .principles { grid-template-columns: 1fr 1fr; }
  .principle:nth-child(2) { border-right: 0; }
  .principle:nth-child(3),
  .principle:nth-child(4) { border-top: 1px solid var(--line); }
  .spec-grid { grid-template-columns: 1fr; gap: 5px; }
  .spec-grid dd { margin-bottom: 14px; }
}

@media (max-width: 500px) {
  .principles { grid-template-columns: 1fr; }
  .principle,
  .principle:not(:first-child) {
    padding-left: 0;
    border-right: 0;
    border-top: 1px solid var(--line);
  }
  .principle:first-child { border-top: 0; }
}