:root {
  --paper: #f4f1e8;
  --ink: #20221e;
  --muted: #65675f;
  --rule: #8c9188;
  --green: #193d2a;
  --green-soft: #315843;
  --max: 980px;
  --reading: 760px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Libre Caslon Text", Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
.wrap { width: min(calc(100% - 42px), var(--max)); margin-inline: auto; }
.masthead { padding: 44px 0 0; text-align: center; }
.wordmark {
  display: inline-block;
  color: var(--green);
  font-family: "Libre Caslon Display", Georgia, serif;
  font-size: clamp(2.65rem, 6.5vw, 3.9rem);
  line-height: 1;
  letter-spacing: 0.065em;
  text-decoration: none;
  text-transform: uppercase;
}
.rule { height: 1px; background: var(--rule); opacity: 0.82; }
.masthead .rule:first-of-type { margin-top: 24px; }
nav {
  display: flex; justify-content: center; gap: 42px;
  padding: 12px 0 10px; font-size: 0.78rem;
  letter-spacing: 0.15em; text-transform: uppercase;
}
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a.active { color: var(--green); }
main { min-height: 60vh; }
.home { padding-top: 82px; }
.title-page, .page-title { max-width: var(--reading); margin: 0 auto; text-align: center; }
.kicker, .record-status, .paper-status, .meta-label {
  color: var(--green-soft); font-size: 0.76rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
}
.kicker { margin: 0 0 20px; }
h1, h2, h3 { font-family: "Libre Caslon Display", Georgia, serif; font-weight: 400; }
.title-page h1, .page-title h1 {
  margin: 0; font-size: clamp(1.95rem, 5vw, 3.4rem);
  line-height: 1.08; letter-spacing: 0.01em;
}
.summary { max-width: 660px; margin: 32px auto 0; font-size: 1.08rem; }
.summary + .summary { margin-top: 18px; }
.contents {
  margin-top: 82px; padding: 48px 0 72px; border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 64px;
}
.contents article { text-align: center; }
.section-no { margin: 0 0 8px; color: var(--muted); font-size: 0.75rem; letter-spacing: 0.12em; }
.contents h2 { margin: 0 0 10px; font-size: 1.85rem; }
.contents h2 a { text-decoration: none; }
.contents h2 a:hover { color: var(--green); }
.contents p:last-child {
  margin: 0 auto; max-width: 340px; color: var(--muted); font-size: 0.95rem;
}
.page-title { padding: 76px 0 52px; }
.page-title > p:last-child { max-width: 680px; margin: 28px auto 0; }
.research-list { border-top: 1px solid var(--rule); padding-bottom: 72px; }
.record { padding: 42px 0 46px; border-bottom: 1px solid #b7b3a7; }
.record-status { margin: 0 0 13px; }
.record h2 {
  max-width: 800px; margin: 0 0 18px;
  font-size: clamp(1.65rem, 4vw, 2.45rem); line-height: 1.2;
}
.record h2 a { text-decoration: none; }
.record h2 a:hover { color: var(--green); }
.record > p:not(.record-status) { max-width: 740px; color: #4e4d46; }
.record-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 24px; color: var(--muted); font-size: 0.9rem; }
.detail-link { display: inline-block; margin-top: 18px; color: var(--green); text-underline-offset: 4px; }
.paper-header { max-width: 830px; margin: 0 auto; padding: 70px 0 44px; text-align: center; }
.back-link {
  display: inline-block; margin-bottom: 26px; color: var(--muted);
  font-size: 0.82rem; letter-spacing: 0.1em; text-decoration: none; text-transform: uppercase;
}
.back-link:hover { color: var(--green); }
.paper-header h1 {
  margin: 8px auto 20px; max-width: 820px;
  font-size: clamp(2.15rem, 5.5vw, 4rem); line-height: 1.08;
}
.paper-status { margin: 0; }
.primary-record {
  max-width: 720px; margin: 28px auto 0; padding: 19px 22px;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.primary-record strong { display: block; font-weight: 700; }
.primary-record p { margin: 5px 0 0; color: var(--muted); font-size: 0.95rem; }
.paper-meta {
  max-width: 720px; margin: 26px auto 0; display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; text-align: left;
}
.paper-meta div { border-top: 1px solid #b7b3a7; padding-top: 10px; }
.paper-meta p { margin: 2px 0 0; }
.paper-body { max-width: var(--reading); margin: 0 auto; padding: 8px 0 84px; }
.paper-body section { padding: 34px 0 38px; border-top: 1px solid var(--rule); }
.paper-body h2 { margin: 0 0 15px; font-size: 1.75rem; }
.paper-body p { margin: 0 0 18px; color: #444740; }
.note { color: var(--muted) !important; font-style: italic; }
.about-body { max-width: 700px; margin: 0 auto; padding: 8px 0 84px; border-top: 1px solid var(--rule); }
.about-body h2 { margin: 40px 0 12px; font-size: 1.65rem; text-align: center; }
.about-body p { color: #46453f; }
.site-footer { padding: 0 0 36px; text-align: center; }
.site-footer p {
  margin: 18px 0 0; color: var(--muted); font-size: 0.72rem;
  letter-spacing: 0.12em; text-transform: uppercase;
}
.not-found { max-width: 680px; margin: 0 auto; padding: 90px 0 110px; text-align: center; }
.not-found h1 { margin: 0 0 16px; font-size: clamp(3rem, 8vw, 5rem); }
.not-found a { color: var(--green); text-underline-offset: 4px; }
@media (max-width: 640px) {
  body { font-size: 16px; }
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .masthead { padding-top: 30px; }
  nav { gap: 22px; font-size: 0.72rem; }
  .home { padding-top: 60px; }
  .contents { margin-top: 68px; grid-template-columns: 1fr; gap: 42px; }
  .page-title { padding-top: 58px; }
  .paper-header { padding-top: 54px; }
  .paper-meta { grid-template-columns: 1fr; }
  .primary-record { padding-inline: 14px; }
}