:root {
  --article-bg: #fbfaf5;
  --article-surface: #fff;
  --article-soft: #f7f5ee;
  --article-line: #d7e6da;
  --article-ink: #1f2937;
  --article-muted: #52606d;
  --article-brand: #2f6f3e;
  --article-brand-deep: #245832;
  --article-warn: #fff8e8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--article-ink);
  background: radial-gradient(circle at top left, rgba(169, 208, 181, .22), transparent 34%), linear-gradient(180deg, #fdfcf8 0%, var(--article-bg) 100%);
  font-family: "Noto Sans JP", sans-serif;
  line-height: 1.85;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.article-shell { width: min(1120px, calc(100% - 32px)); margin-inline: auto; }
.article-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(47, 111, 62, .1);
  background: rgba(251, 250, 245, .92);
  backdrop-filter: blur(16px);
}
.article-header__inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.article-brand { display: flex; align-items: center; gap: 11px; color: var(--article-brand-deep); font-weight: 800; }
.article-brand img { width: 46px; height: 46px; object-fit: contain; border-radius: 14px; background: #fff; }
.article-nav { display: flex; flex-wrap: wrap; gap: 18px; color: var(--article-muted); font-size: 14px; font-weight: 700; }
.article-hero { padding: 54px 0 26px; }
.article-kicker { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; padding: 7px 14px; color: var(--article-brand-deep); background: rgba(47, 111, 62, .09); font-size: 13px; font-weight: 800; }
.article-hero__grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(300px, .9fr); gap: 28px; margin-top: 20px; }
.article-hero__copy, .article-hero__image, .article-main, .article-aside {
  border: 1px solid rgba(47, 111, 62, .11);
  border-radius: 28px;
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 22px 50px rgba(15, 23, 42, .06);
}
.article-hero__copy { padding: 32px; }
.article-hero h1 { margin: 13px 0 17px; font-family: "Shippori Mincho", serif; font-size: clamp(30px, 4vw, 48px); line-height: 1.3; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 18px; color: var(--article-muted); font-size: 13px; font-weight: 600; }
.article-summary { margin: 17px 0 0; color: var(--article-muted); }
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 0; padding: 0; list-style: none; }
.article-tags li { border: 1px solid #b7d8be; border-radius: 999px; background: #eef7f0; padding: 5px 12px; color: var(--article-brand-deep); font-size: 12px; font-weight: 700; }
.article-hero__image { min-height: 280px; overflow: hidden; }
.article-hero__image img { width: 100%; height: 100%; object-fit: cover; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(260px, .8fr); gap: 28px; padding-bottom: 72px; }
.article-main { min-width: 0; padding: 30px; }
.article-main h2, .article-main h3 { margin: 36px 0 13px; font-family: "Shippori Mincho", serif; line-height: 1.5; }
.article-main h2 { font-size: clamp(24px, 3vw, 31px); }
.article-main h3 { font-size: 20px; }
.article-main p { margin: 14px 0; }
.article-main ul, .article-main ol { padding-left: 1.35rem; }
.article-main li + li { margin-top: 8px; }
.article-main strong { color: #173d25; }
.article-lead, .article-note, .article-caution { margin: 22px 0; border-radius: 22px; padding: 20px 22px; }
.article-lead { border: 1px solid var(--article-line); background: #f3faf5; }
.article-note { border: 1px solid var(--article-line); background: var(--article-soft); }
.article-caution { border: 1px solid #ead9a8; background: var(--article-warn); }
.article-table-wrap { margin: 22px 0; overflow-x: auto; }
.article-table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 14px; }
.article-table th, .article-table td { border: 1px solid var(--article-line); padding: 13px; text-align: left; vertical-align: top; }
.article-table th { background: #f3f8f4; font-weight: 800; }
.article-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 23px 0; padding: 0; list-style: none; counter-reset: article-step; }
.article-steps li { position: relative; border: 1px solid var(--article-line); border-radius: 20px; background: #fff; padding: 51px 18px 18px; }
.article-steps li::before { counter-increment: article-step; content: counter(article-step); position: absolute; top: 15px; left: 17px; display: grid; place-items: center; width: 27px; height: 27px; border-radius: 50%; color: #fff; background: var(--article-brand); font-size: 13px; font-weight: 800; }
.article-link { color: var(--article-brand); font-weight: 700; text-decoration: underline; text-decoration-color: #b7d8be; text-underline-offset: 4px; }
.article-sources { margin-top: 38px; border-top: 1px solid var(--article-line); padding-top: 24px; }
.article-sources h2 { margin-top: 0; font-size: 22px; }
.article-sources li { overflow-wrap: anywhere; font-size: 14px; color: var(--article-muted); }
.article-aside { position: sticky; top: 92px; align-self: start; padding: 24px; }
.article-aside h2 { margin: 0 0 15px; font-family: "Shippori Mincho", serif; font-size: 19px; }
.article-related { display: grid; gap: 11px; }
.article-related a { display: block; border: 1px solid rgba(47, 111, 62, .1); border-radius: 18px; background: var(--article-soft); padding: 15px; }
.article-related strong, .article-related span { display: block; }
.article-related strong { font-size: 14px; }
.article-related span { margin-top: 5px; color: var(--article-muted); font-size: 12px; line-height: 1.7; }
.article-cta { display: inline-flex; align-items: center; justify-content: center; gap: 9px; margin-top: 18px; border-radius: 999px; background: var(--article-brand); padding: 12px 18px; color: #fff; font-size: 14px; font-weight: 800; }
.article-footer { border-top: 1px solid rgba(47, 111, 62, .1); padding: 26px 0 46px; color: var(--article-muted); font-size: 13px; }
.article-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px 20px; }
.article-footer__links { display: flex; flex-wrap: wrap; gap: 15px; }
@media (max-width: 900px) {
  .article-hero__grid, .article-layout { grid-template-columns: 1fr; }
  .article-aside { position: static; }
}
@media (max-width: 700px) {
  .article-header__inner { min-height: 64px; }
  .article-nav { display: none; }
  .article-hero { padding-top: 34px; }
  .article-hero__copy, .article-main { padding: 23px; }
  .article-hero__image { min-height: 210px; }
  .article-steps { grid-template-columns: 1fr; }
}