@charset "UTF-8";

:root {
  color-scheme: light;
  --guide-ink: #18212f;
  --guide-muted: #5f6b7a;
  --guide-line: #dfe6ee;
  --guide-paper: #ffffff;
  --guide-brand: #146c78;
  --guide-brand-deep: #0e4d59;
  --guide-accent: #9a5f22;
  --guide-shadow: 0 18px 45px rgba(24, 33, 47, .09);
}

body {
  margin: 0;
  color: var(--guide-ink);
  background: #f7f9fb;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  letter-spacing: 0;
}

a { color: var(--guide-brand-deep); text-underline-offset: .18em; }
a:hover, a:focus { color: #093941; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--guide-line);
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  color: var(--guide-ink);
  text-decoration: none;
  font-weight: 800;
  line-height: 1.2;
}

.brand span {
  display: block;
  margin-top: 4px;
  color: var(--guide-muted);
  font-size: 12px;
  font-weight: 600;
}

.header-links { display: flex; flex-wrap: wrap; gap: 12px; font-size: 14px; }
.header-links a { color: var(--guide-muted); font-weight: 700; text-decoration: none; }

.hero {
  color: #ffffff;
  background: linear-gradient(135deg, #146c78, #273e57);
}

.breadcrumb {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 24px 0;
  color: rgba(255, 255, 255, .82);
  font-size: 13px;
}

.breadcrumb a { color: #ffffff; }

.hero__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 54px 24px 48px;
  text-align: center;
}

.eyebrow { margin: 0 0 14px; font-size: 14px; font-weight: 800; }
h1 { margin: 0; font-size: clamp(30px, 5vw, 50px); line-height: 1.25; letter-spacing: 0; }
.hero-lead { max-width: 860px; margin: 22px auto 0; color: rgba(255, 255, 255, .93); font-size: 18px; text-align: left; }
.formula { max-width: 900px; margin: 26px auto 0; padding: 17px 20px; border: 1px solid rgba(255, 255, 255, .3); border-radius: 8px; background: rgba(255, 255, 255, .12); text-align: left; font-weight: 800; }

.layout { max-width: 1180px; }
main { min-width: 0; }
.article-panel { padding: clamp(22px, 4vw, 42px); }
.article-panel p { margin: 0 0 18px; }
.article-panel ul, .article-panel ol { margin: 12px 0 24px; padding-left: 1.4em; }
.article-panel li + li { margin-top: 8px; }
.article-panel h3 { padding-left: 14px; border-left: 5px solid var(--guide-accent); }

.checklist { list-style: none; padding-left: 0 !important; }
.checklist li { position: relative; padding-left: 30px; }
.checklist li::before { content: ""; position: absolute; left: 0; top: .5em; width: 16px; height: 16px; border: 2px solid var(--guide-brand); border-radius: 3px; background: #ffffff; }

.source-list a::after { content: " (公式)"; color: var(--guide-muted); font-size: 12px; text-decoration: none; }
.as-of { color: var(--guide-muted); font-size: 14px; }

.site-footer { border-top: 1px solid var(--guide-line); background: #ffffff; color: var(--guide-muted); }
.site-footer__inner { max-width: 1180px; margin: 0 auto; padding: 28px 24px 38px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-bottom: 16px; }

@media (max-width: 900px) {
  .site-header__inner { align-items: flex-start; flex-direction: column; padding: 12px 16px; }
  .header-links { gap: 8px 12px; }
  .breadcrumb { padding: 12px 16px 0; }
  .hero__inner { padding: 38px 16px 36px; text-align: left; }
  .hero-lead, .formula { font-size: 16px; }
}

@media (max-width: 640px) {
  .article-panel table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .article-panel th, .article-panel td { min-width: 150px; }
}