:root {
  color-scheme: light;
  --deep-green: #0b6a3a;
  --dark-green: #14523b;
  --leaf-green: #3c8061;
  --sage-green: #d7e4d0;
  --ivory: #f3ebcf;
  --yellow: #fff200;
  --ink: #16231b;
  --muted: #5e695f;
  --line: rgba(11, 106, 58, 0.14);
  --soft: #f7fbf5;
  --sans-jp: "Noto Sans JP", sans-serif;
  --serif-jp: "Noto Serif JP", serif;
  --mono: "JetBrains Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--soft);
  font-family: var(--sans-jp), "Helvetica Neue", Arial, sans-serif;
}

a {
  color: inherit;
}

.site-header {
  color: #fff;
  background:
    linear-gradient(135deg, rgba(11, 106, 58, 0.96), rgba(20, 82, 59, 0.92)),
    radial-gradient(circle at 88% 18%, rgba(255, 242, 0, 0.22), transparent 28%);
}

.header-inner,
.article-shell,
.breadcrumb ol,
.footer-inner {
  width: min(100% - 48px, 1180px);
  margin-inline: auto;
}

.header-inner {
  padding: 28px 0 68px;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-link {
  display: inline-flex;
  width: min(48vw, 220px);
  text-decoration: none;
}

.brand-link img {
  display: block;
  width: 100%;
  height: auto;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.hero {
  margin-top: 54px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: rgba(243, 235, 207, 0.96);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--sage-green);
}

h1 {
  margin: 22px 0 0;
  font-family: var(--serif-jp);
  font-size: clamp(34px, 4.6vw, 58px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.02em;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 22px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 13px;
  font-weight: 800;
}

.category-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  color: #102117;
  background: var(--yellow);
}

.breadcrumb {
  padding: 18px 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  list-style: none;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: rgba(94, 105, 95, 0.55);
}

.breadcrumb a {
  color: var(--deep-green);
  text-decoration: none;
}

.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 36px;
  align-items: start;
  padding: 68px 0 88px;
}

.article-main {
  min-width: 0;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 18px 42px rgba(11, 63, 37, 0.06);
}

.eyecatch {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #dbe9d4;
}

.eyecatch img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-body {
  padding: clamp(28px, 4vw, 52px);
}

.article-body p {
  margin: 0;
  color: #2f3a42;
  font-size: 16px;
  font-weight: 400;
  line-height: 2;
}

.article-body p + p {
  margin-top: 18px;
}

.article-figure {
  margin: 30px 0;
}

.article-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(11, 106, 58, 0.1);
}

.article-figure figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.7;
}

.article-body h2 {
  margin: 44px 0 16px;
  color: var(--deep-green);
  font-family: var(--serif-jp);
  font-size: clamp(25px, 3vw, 34px);
  line-height: 1.35;
}

.article-body :is(h2, h3) { scroll-margin-top: 24px; }
.article-toc { margin: 0 0 32px; padding: 20px 24px; border: 1px solid var(--line); background: #fff; }
.article-toc .article-toc__title { font-weight: 800; color: var(--deep-green); }
.article-toc ol { margin: 12px 0 0; padding-left: 1.4em; display: grid; gap: 8px; }
.article-toc a, .article-sources a, .article-credit a { text-underline-offset: .2em; }
.article-toc a { font-size: 14px; line-height: 1.7; }
.article-sources { margin: 28px 0; padding: 24px; background: var(--soft); border: 1px solid var(--line); }
.article-sources h3 { margin: 0 0 12px; font-size: 18px; }
.article-sources ul { padding-left: 1.2em; margin: 16px 0 0; }
.article-sources li { margin: 16px 0 0; line-height: 1.8; overflow-wrap: anywhere; }
.article-sources li a { font-weight: 700; color: var(--deep-green); }
.article-sources li span { display: block; font-size: 13px; color: var(--muted); }
.article-body .article-note, .article-body .article-credit { margin: 16px 0; font-size: 13px; line-height: 1.9; color: var(--muted); }
.article-credit { padding-top: 20px; border-top: 1px solid var(--line); }
.article-table-wrap { max-width: 100%; overflow-x: auto; margin: 24px 0; }
.article-table { width: 100%; min-width: 480px; border-collapse: collapse; font-size: 14px; line-height: 1.7; }
.article-table caption { text-align: left; font-weight: 700; margin-bottom: 12px; }
.article-table :is(th, td) { border: 1px solid #d7e4d0; padding: 12px; text-align: right; font-variant-numeric: tabular-nums; }
.article-table th { background: var(--soft); color: var(--dark-green); }
.article-table thead th { background: var(--deep-green); color: #fff; }
.article-table th:first-child { text-align: left; }
.skip-link { position: fixed; top: 8px; left: 8px; padding: 12px 20px; z-index: 100; color: #fff; background: var(--deep-green); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
:is(.article-toc, .article-sources, .article-credit, .article-table-wrap) :focus-visible,
.article-table-wrap:focus-visible { outline: 3px solid #0b6a3a; outline-offset: 4px; }
@media (max-width: 600px) {
  .article-toc, .article-sources { padding: 18px; }
  .hero-meta { row-gap: 10px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

.summary-box {
  margin: 0 0 34px;
  padding: 24px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.summary-box h2 {
  margin: 0 0 12px;
  color: var(--ink);
  font-family: var(--sans-jp);
  font-size: 18px;
}

.summary-box ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 1.2em;
  color: #2f3a42;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.8;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 42px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.article-tags a {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  color: var(--deep-green);
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
  background: var(--soft);
  border: 1px solid var(--line);
}

.article-side {
  position: sticky;
  top: 22px;
  display: grid;
  gap: 18px;
}

.side-block {
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 18px 42px rgba(11, 63, 37, 0.05);
}

.side-block h2 {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 900;
}

.side-block p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.8;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  color: #101010;
  font-size: 14px;
  font-weight: 900;
  text-decoration: none;
  background: var(--yellow);
}

.button::after {
  content: "";
  width: 7px;
  height: 7px;
  margin-left: 10px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
}

.side-links {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.side-links a {
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.6;
  text-decoration: none;
}

.site-footer {
  position: relative;
  overflow: hidden;
  padding: 56px 32px 32px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(20, 82, 59, 0.97), rgba(11, 106, 58, 0.94)),
    radial-gradient(circle at 85% 15%, rgba(255, 242, 0, 0.22), transparent 28%);
}

.site-footer::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 82px 100%;
}

.footer-inner {
  position: relative;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1.2fr) repeat(3, minmax(150px, 1fr));
  gap: 28px;
}

.footer-top > * {
  min-width: 0;
}

.footer-logo {
  display: block;
  width: min(100%, 250px);
}

.footer-logo img {
  display: block;
  width: 100%;
  height: auto;
}

.footer-heading {
  margin: 0 0 16px;
  color: rgba(243, 235, 207, 0.44);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.66);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a.footer-link--external {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  width: fit-content;
}

.footer-links a.footer-link--external i {
  font-size: 0.9em;
  line-height: 1;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--sage-green);
}

.footer-about-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  margin-top: 30px;
  padding: 24px 0 10px;
  border-top: 1px solid rgba(215, 228, 208, 0.16);
}

.footer-tagline {
  flex: 1 1 auto;
  margin: 0;
  color: rgba(255, 255, 255, 0.54);
  font-family: var(--serif-jp);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.55;
  white-space: nowrap;
}

.footer-social {
  display: flex;
  flex: 0 0 auto;
  gap: 10px;
  margin-top: 0;
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  color: rgba(255, 255, 255, 0.58);
  font-family: var(--mono);
  font-size: 16px;
  text-decoration: none;
  border: 1px solid rgba(215, 228, 208, 0.18);
  transition:
    color 0.2s ease,
    border-color 0.2s ease,
    background-color 0.2s ease;
}

.footer-social a:hover,
.footer-social a:focus-visible {
  color: var(--ivory);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(243, 235, 207, 0.5);
}

.footer-social i {
  line-height: 1;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.footer-copy {
  margin: 0;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  font-weight: 400;
}

.footer-copy strong {
  color: #fff;
  margin-right: 4px;
}

.footer-version {
  color: rgba(255, 255, 255, 0.42);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

@media (max-width: 900px) {
  .article-shell {
    grid-template-columns: 1fr;
  }

  .article-side {
    position: static;
  }
}

@media (max-width: 640px) {
  .header-inner,
  .article-shell,
  .breadcrumb ol,
  .footer-inner {
    width: min(100% - 32px, 1180px);
  }

  .top-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .header-inner {
    padding-bottom: 54px;
  }

  .hero {
    margin-top: 34px;
  }

  .article-shell {
    padding: 48px 0 64px;
  }

  .site-footer {
    padding: 42px 24px 28px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-about-row {
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 28px;
    padding: 20px 0 8px;
  }

  .footer-tagline {
    flex: 1 1 0;
    min-width: 0;
    overflow: hidden;
    font-size: 10px;
    line-height: 1.5;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .footer-social {
    gap: 8px;
  }

  .footer-social a {
    width: 32px;
    height: 32px;
    font-size: 15px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

.heading-phrase { display: inline-block; }