@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Noto+Serif+SC:wght@500;600;700;900&display=swap');

:root {
  --paper: #f2efe5;
  --paper-light: #faf8f1;
  --ink: #151917;
  --muted: #626862;
  --rule: rgba(21, 25, 23, .2);
  --blue: #154f66;
  --red: #e24b25;
  --lime: #c9e265;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --mono: "DM Mono", "SFMono-Regular", monospace;
  --page: min(1240px, calc(100vw - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.research-site {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(21,25,23,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21,25,23,.035) 1px, transparent 1px),
    var(--paper);
  background-size: 30px 30px;
  font-family: var(--serif);
  line-height: 1.75;
}
body.research-site::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
  opacity: .12;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitchTiles'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
}
body.research-site a { color: inherit; }
button, input { font: inherit; }
.page-shell { width: var(--page); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 2000; padding: 10px 16px; color: white; background: var(--ink); }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--rule);
  background: rgba(242,239,229,.9);
  backdrop-filter: blur(14px);
}
.site-header__inner { min-height: 74px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: baseline; gap: 12px; width: fit-content; text-decoration: none; }
.brand strong { font: 500 21px/1 var(--mono); letter-spacing: -.08em; }
.brand span { font-size: 13px; font-weight: 700; letter-spacing: .12em; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a { padding: 9px 14px; text-decoration: none; font: 500 12px/1 var(--mono); border: 1px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { border-color: var(--ink); background: var(--paper-light); }
.site-header__note { justify-self: end; margin: 0; color: var(--muted); font: 400 11px/1.5 var(--mono); }
.menu-toggle { display: none; justify-self: end; border: 1px solid var(--ink); background: transparent; padding: 9px 11px; font: 500 11px/1 var(--mono); }

.hero { min-height: 720px; display: grid; grid-template-rows: 1fr auto; padding: 82px 0 0; border-bottom: 1px solid var(--rule); }
.hero__layout { display: grid; grid-template-columns: 140px minmax(0, 1fr) 300px; gap: 44px; align-items: start; }
.hero__folio { writing-mode: vertical-rl; color: var(--muted); font: 400 11px/1.6 var(--mono); letter-spacing: .16em; }
.hero__kicker { margin: 0 0 26px; color: var(--red); font: 500 11px/1.4 var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.hero h1 { max-width: 820px; margin: 0; font-size: clamp(58px, 8.2vw, 116px); line-height: .98; letter-spacing: -.065em; font-weight: 900; }
.hero h1 em { display: block; color: transparent; font-style: normal; -webkit-text-stroke: 1.5px var(--ink); }
.hero__statement { max-width: 770px; margin: 34px 0 0; font-size: clamp(18px, 2vw, 26px); line-height: 1.65; font-weight: 600; }
.hero__statement strong { color: var(--red); }
.hero__profile { align-self: end; margin-top: 180px; padding: 26px 0 0 28px; border-left: 1px solid var(--ink); }
.hero__profile::before { content: "↳"; display: block; margin: -62px 0 16px -47px; color: var(--red); font: 500 40px/1 var(--mono); }
.hero__profile small { color: var(--muted); font: 400 10px/1.6 var(--mono); }
.hero__profile h2 { margin: 15px 0 12px; font-size: 25px; line-height: 1.3; }
.hero__profile p { margin: 0; color: var(--muted); font-size: 14px; }
.hero__ledger { margin-top: 70px; display: grid; grid-template-columns: 1.4fr repeat(3, .65fr); border-top: 1px solid var(--rule); }
.ledger-cell { min-height: 116px; padding: 23px 24px; border-right: 1px solid var(--rule); }
.ledger-cell:last-child { border-right: 0; }
.ledger-cell span { display: block; color: var(--muted); font: 400 10px/1.4 var(--mono); text-transform: uppercase; }
.ledger-cell strong { display: block; margin-top: 12px; font-size: 19px; line-height: 1.4; }
.ledger-cell strong[data-total-count] { color: var(--blue); font: 500 40px/1 var(--mono); }

.section { padding: 104px 0; border-bottom: 1px solid var(--rule); }
.section-heading { display: grid; grid-template-columns: 150px minmax(0, 1fr) 280px; gap: 36px; align-items: start; margin-bottom: 56px; }
.section-heading__code { color: var(--red); font: 500 11px/1.5 var(--mono); }
.section-heading h2 { margin: 0; font-size: clamp(40px, 5.5vw, 76px); line-height: 1.05; letter-spacing: -.045em; }
.section-heading p { margin: 8px 0 0; color: var(--muted); font-size: 15px; }

.topic-grid { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--ink); }
.topic-card { position: relative; min-height: 370px; padding: 26px 22px; border-right: 1px solid var(--rule); background: rgba(250,248,241,.54); overflow: hidden; }
.topic-card:last-child { border-right: 0; }
.topic-card:nth-child(2), .topic-card:nth-child(5) { background: var(--ink); color: var(--paper-light); }
.topic-card__code { font: 500 11px/1 var(--mono); color: var(--red); }
.topic-card h3 { margin: 94px 0 18px; font-size: 26px; line-height: 1.25; }
.topic-card p { margin: 0; color: var(--muted); font-size: 14px; }
.topic-card:nth-child(2) p, .topic-card:nth-child(5) p { color: rgba(255,255,255,.55); }
.topic-card__number { position: absolute; right: -6px; bottom: -30px; color: rgba(21,25,23,.07); font: 500 118px/1 var(--mono); }
.topic-card:nth-child(2) .topic-card__number, .topic-card:nth-child(5) .topic-card__number { color: rgba(255,255,255,.08); }

.archive-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.archive-card { min-width: 0; }
.archive-card[hidden] { display: none; }
.archive-card__link { position: relative; display: flex; flex-direction: column; min-height: 410px; height: 100%; padding: 28px; border: 1px solid var(--rule); background: var(--paper-light); text-decoration: none; transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
.archive-card__link:hover { transform: translateY(-5px); border-color: var(--ink); box-shadow: 12px 14px 0 rgba(21,25,23,.1); }
.archive-card:first-child .archive-card__link { color: white; background: var(--blue); }
.archive-card__top { display: flex; justify-content: space-between; align-items: center; }
.archive-card__index { font: 500 28px/1 var(--mono); }
.format-badge { padding: 5px 8px; border: 1px solid currentColor; font: 500 9px/1 var(--mono); }
.archive-card__topic { margin: 54px 0 13px; color: var(--red); font: 500 10px/1.5 var(--mono); text-transform: uppercase; }
.archive-card h3 { margin: 0; font-size: 27px; line-height: 1.3; }
.archive-card__dek { margin: 18px 0 26px; color: var(--muted); font-size: 14px; }
.archive-card:first-child .archive-card__dek { color: rgba(255,255,255,.64); }
.archive-card__meta { margin-top: auto; display: flex; flex-wrap: wrap; gap: 8px 14px; padding-top: 18px; border-top: 1px solid currentColor; font: 400 9px/1.4 var(--mono); opacity: .65; }
.archive-card__arrow { position: absolute; right: 25px; bottom: 63px; color: var(--red); font: 500 26px/1 var(--mono); }
.section-action { display: inline-flex; margin-top: 34px; padding: 12px 16px; border: 1px solid var(--ink); text-decoration: none; font: 500 11px/1 var(--mono); }
.section-action:hover { color: white; background: var(--ink); }

.method-band { color: var(--paper-light); background: var(--ink); }
.method-band .section-heading p { color: rgba(255,255,255,.55); }
.method-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.method-step { min-height: 290px; padding: 30px 26px; border: 1px solid rgba(255,255,255,.2); border-right: 0; }
.method-step:last-child { border-right: 1px solid rgba(255,255,255,.2); }
.method-step b { color: var(--red); font: 500 12px/1 var(--mono); }
.method-step h3 { margin: 76px 0 15px; font-size: 25px; }
.method-step p { margin: 0; color: rgba(255,255,255,.55); font-size: 14px; }

.site-footer { padding: 64px 0 36px; color: var(--paper-light); background: var(--blue); }
.site-footer__grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 80px; }
.site-footer h2 { max-width: 720px; margin: 0; font-size: clamp(36px, 5vw, 65px); line-height: 1.12; }
.site-footer h2 strong { color: var(--lime); }
.site-footer__nav { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 30px; align-content: start; }
.site-footer__nav a { padding-bottom: 9px; border-bottom: 1px solid rgba(255,255,255,.25); text-decoration: none; font: 400 11px/1.5 var(--mono); }
.site-footer__base { display: flex; justify-content: space-between; gap: 20px; margin-top: 70px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.2); color: rgba(255,255,255,.5); font: 400 10px/1.5 var(--mono); }

.library-hero { padding: 88px 0 58px; border-bottom: 1px solid var(--rule); }
.library-hero__top { display: grid; grid-template-columns: 1fr 280px; gap: 60px; align-items: end; }
.library-hero h1, .about-hero h1 { margin: 10px 0 0; font-size: clamp(56px, 8vw, 110px); line-height: 1; letter-spacing: -.06em; }
.library-hero p { margin: 0; color: var(--muted); }
.filter-bar { position: sticky; top: 74px; z-index: 80; display: grid; grid-template-columns: minmax(260px, 1fr) 2fr auto; gap: 12px; padding: 18px 0; border-bottom: 1px solid var(--rule); background: rgba(242,239,229,.94); backdrop-filter: blur(12px); }
.search-box { display: flex; align-items: center; border: 1px solid var(--ink); background: var(--paper-light); }
.search-box span { padding: 0 12px; font: 500 13px/1 var(--mono); }
.search-box input { width: 100%; padding: 11px 12px 11px 0; border: 0; outline: 0; background: transparent; font-size: 13px; }
.topic-filters { display: flex; flex-wrap: wrap; gap: 7px; }
.topic-filters button { padding: 9px 11px; border: 1px solid var(--rule); background: transparent; cursor: pointer; font: 400 10px/1 var(--mono); }
.topic-filters button:hover, .topic-filters button.is-active { color: white; border-color: var(--ink); background: var(--ink); }
.result-count { align-self: center; color: var(--muted); font: 400 10px/1 var(--mono); }
.library-list { padding: 44px 0 100px; }
.empty-state { padding: 70px 20px; text-align: center; border: 1px dashed var(--rule); }

.about-hero { min-height: 620px; padding: 100px 0; display: grid; grid-template-columns: 1fr 340px; gap: 80px; align-items: end; border-bottom: 1px solid var(--rule); }
.about-hero__note { padding: 28px; border: 1px solid var(--ink); background: var(--paper-light); transform: rotate(2deg); box-shadow: 12px 14px 0 rgba(21,25,23,.08); }
.about-hero__note p { margin: 0; font-size: 20px; font-weight: 700; }
.about-hero__note small { display: block; margin-top: 20px; color: var(--red); font: 500 10px/1.5 var(--mono); }
.about-grid { display: grid; grid-template-columns: 260px 1fr; gap: 70px; }
.about-grid h2 { margin: 0; font-size: 18px; }
.about-copy { max-width: 780px; font-size: 19px; }
.about-copy p:first-child { margin-top: 0; }
.principles { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.principle { min-height: 220px; padding: 28px; background: var(--paper-light); }
.principle b { color: var(--red); font: 500 11px/1 var(--mono); }
.principle h3 { margin: 46px 0 10px; font-size: 22px; }
.principle p { margin: 0; color: var(--muted); font-size: 14px; }

.reader-progress { position: fixed; inset: 0 0 auto; z-index: 200; height: 3px; background: var(--red); transform: scaleX(0); transform-origin: left; }
.reader { padding-bottom: 110px; }
.reader-head { max-width: 980px; padding: 90px 0 64px 150px; }
.reader-head__topic { margin: 0 0 24px; color: var(--red); font: 500 11px/1.4 var(--mono); letter-spacing: .15em; }
.reader-head h1 { margin: 0; font-size: clamp(46px, 6.8vw, 92px); line-height: 1.08; letter-spacing: -.05em; }
.reader-head__dek { max-width: 760px; margin: 30px 0 0; color: var(--muted); font-size: 20px; }
.reader-head__meta { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--rule); color: var(--muted); font: 400 10px/1.5 var(--mono); }
.reader-layout { display: grid; grid-template-columns: 150px minmax(0, 720px) 210px; gap: 48px; align-items: start; }
.reader-toc { position: sticky; top: 112px; }
.reader-toc > p, .reader-margin > p { margin: 0 0 18px; color: var(--red); font: 500 9px/1.4 var(--mono); }
.reader-toc nav { display: grid; gap: 9px; }
.reader-toc a { color: var(--muted); text-decoration: none; font-size: 11px; line-height: 1.4; }
.reader-toc a:hover { color: var(--ink); }
.reader-toc .toc-h3 { padding-left: 12px; }
.reader-margin { position: sticky; top: 112px; padding: 20px 0 0 20px; border-left: 1px solid var(--rule); }
.reader-margin span { color: var(--muted); font-size: 12px; }
.markdown-body { min-width: 0; font-size: 18px; line-height: 2; }
.markdown-body > :first-child { margin-top: 0; }
.markdown-body h1 { display: none; }
.markdown-body h2 { scroll-margin-top: 100px; margin: 72px 0 22px; font-size: 36px; line-height: 1.25; letter-spacing: -.025em; }
.markdown-body h3 { scroll-margin-top: 100px; margin: 46px 0 16px; font-size: 25px; line-height: 1.35; }
.markdown-body p { margin: 0 0 24px; }
.markdown-body ul, .markdown-body ol { margin: 0 0 28px; padding-left: 1.4em; }
.markdown-body li { margin: 9px 0; padding-left: .35em; }
.markdown-body blockquote { margin: 36px 0; padding: 25px 30px; border: 1px solid var(--ink); border-left: 7px solid var(--red); background: var(--paper-light); font-size: 21px; font-weight: 700; }
.markdown-body blockquote p { margin: 0; }
.markdown-body code { padding: .12em .35em; color: var(--blue); background: rgba(21,79,102,.08); font: 400 .86em/1.5 var(--mono); }
.markdown-body pre { overflow-x: auto; margin: 32px 0; padding: 24px; color: #f6f2e9; background: var(--ink); }
.markdown-body pre code { padding: 0; color: inherit; background: none; }
.markdown-body a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 4px; }
.markdown-body hr { margin: 60px 0; border: 0; border-top: 1px solid var(--rule); }

[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (max-width: 1000px) {
  .site-header__inner { grid-template-columns: 1fr auto; }
  .site-header__note { display: none; }
  .hero__layout { grid-template-columns: 90px minmax(0, 1fr); }
  .hero__profile { grid-column: 2; margin-top: 30px; max-width: 380px; }
  .section-heading { grid-template-columns: 110px minmax(0, 1fr); }
  .section-heading p { grid-column: 2; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-card { border-bottom: 1px solid var(--rule); }
  .topic-card:nth-child(2n) { border-right: 0; }
  .topic-card:last-child { grid-column: 1 / -1; }
  .archive-grid { grid-template-columns: repeat(2, 1fr); }
  .method-grid { grid-template-columns: 1fr 1fr; }
  .method-step:nth-child(2) { border-right: 1px solid rgba(255,255,255,.2); }
  .method-step:nth-child(-n+2) { border-bottom: 0; }
}

@media (max-width: 720px) {
  :root { --page: calc(100vw - 24px); }
  .site-header__inner { min-height: 64px; }
  .site-nav { position: absolute; top: 64px; left: 0; right: 0; display: none; padding: 12px; border-bottom: 1px solid var(--ink); background: var(--paper); }
  .site-nav.is-open { display: grid; }
  .menu-toggle { display: block; }
  .brand span { display: none; }
  .hero { min-height: auto; padding-top: 54px; }
  .hero__layout { grid-template-columns: 1fr; gap: 22px; }
  .hero__folio { writing-mode: initial; }
  .hero h1 { font-size: clamp(48px, 15vw, 70px); }
  .hero__statement { font-size: 18px; }
  .hero__profile { grid-column: auto; margin: 28px 0 0 12px; }
  .hero__ledger { grid-template-columns: 1fr 1fr; }
  .ledger-cell { border-bottom: 1px solid var(--rule); }
  .ledger-cell:nth-child(2n) { border-right: 0; }
  .section { padding: 70px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 18px; margin-bottom: 38px; }
  .section-heading p { grid-column: auto; margin: 0; }
  .topic-grid, .archive-grid, .method-grid, .site-footer__grid, .library-hero__top, .about-hero, .about-grid, .principles { grid-template-columns: 1fr; }
  .topic-card, .topic-card:nth-child(2n), .topic-card:last-child { min-height: 280px; grid-column: auto; border-right: 0; }
  .topic-card h3 { margin-top: 64px; }
  .archive-card__link { min-height: 370px; }
  .method-step, .method-step:nth-child(2), .method-step:last-child { border-right: 1px solid rgba(255,255,255,.2); border-bottom: 0; }
  .method-step:last-child { border-bottom: 1px solid rgba(255,255,255,.2); }
  .site-footer__grid { gap: 44px; }
  .site-footer__base { flex-direction: column; }
  .library-hero { padding-top: 64px; }
  .library-hero__top { gap: 28px; }
  .filter-bar { top: 64px; grid-template-columns: 1fr; }
  .result-count { display: none; }
  .topic-filters { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 3px; }
  .topic-filters button { flex: 0 0 auto; }
  .about-hero { padding: 70px 0; gap: 50px; }
  .about-hero__note { transform: none; }
  .about-grid { gap: 30px; }
  .reader-head { padding: 64px 0 46px; }
  .reader-head__dek { font-size: 17px; }
  .reader-layout { grid-template-columns: 1fr; }
  .reader-toc, .reader-margin { display: none; }
  .markdown-body { font-size: 17px; line-height: 1.9; }
  .markdown-body h2 { font-size: 29px; }
  .markdown-body blockquote { padding: 20px; font-size: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-reveal] { opacity: 1; transform: none; }
}