:root {
  --color-navy-950: #0d1829;
  --color-navy-900: #14233b;
  --color-navy-700: #2d435f;
  --color-gold-600: #a98135;
  --color-gold-100: #f4ecd9;
  --color-white: #ffffff;
  --color-gray-50: #f7f8fa;
  --color-gray-100: #edf0f3;
  --color-gray-300: #cbd2da;
  --color-gray-600: #596575;
  --color-text: #202b39;
  --color-danger-soft: #fff7ed;
  --shadow-card: 0 12px 32px rgba(13, 24, 41, 0.07);
  --radius-sm: 8px;
  --radius-md: 16px;
  --content-width: 1120px;
  --reading-width: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-gray-50);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  overflow-wrap: anywhere;
}

a { color: var(--color-navy-700); text-underline-offset: 0.18em; }
a:hover { color: var(--color-gold-600); }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  transform: translateY(-160%);
  padding: 8px 14px;
  color: var(--color-white);
  background: var(--color-navy-950);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(203, 210, 218, 0.75);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
}

.header-inner {
  width: min(calc(100% - 40px), var(--content-width));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--color-navy-950);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--color-white);
  background: var(--color-navy-900);
  font-family: "Yu Mincho", serif;
}

.global-nav { display: flex; gap: 22px; }
.global-nav a { font-size: 0.9rem; font-weight: 700; text-decoration: none; }

.hero {
  color: var(--color-white);
  background:
    radial-gradient(circle at 85% 18%, rgba(169, 129, 53, 0.2), transparent 28%),
    linear-gradient(135deg, var(--color-navy-950), var(--color-navy-700));
}

.hero-inner {
  width: min(calc(100% - 40px), var(--content-width));
  min-height: 470px;
  margin: 0 auto;
  padding: 92px 0;
  display: grid;
  align-items: center;
  grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.7fr);
  gap: 72px;
}

.kicker, .eyebrow {
  display: inline-block;
  color: var(--color-gold-600);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.hero .kicker { color: #d8bd82; }
.hero h1 {
  max-width: 760px;
  margin: 12px 0 20px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
}
.hero-lead { max-width: 680px; color: #e5e9ef; font-size: 1.08rem; }

.hero-panel {
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.17);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.07);
}
.hero-panel p { margin-top: 0; color: #e5e9ef; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 20px;
  border-radius: 999px;
  color: var(--color-navy-950);
  background: #d8bd82;
  font-weight: 800;
  text-decoration: none;
}
.button:hover { color: var(--color-navy-950); background: #e7d4a9; }

.section { padding: 76px 0; }
.section-alt { background: var(--color-white); }
.container { width: min(calc(100% - 40px), var(--content-width)); margin: 0 auto; }
.reading-container { width: min(calc(100% - 40px), var(--reading-width)); margin: 0 auto; }

.section-heading { max-width: 740px; margin-bottom: 32px; }
.section-heading h2, .page-header h1 {
  margin: 6px 0 10px;
  color: var(--color-navy-950);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  line-height: 1.35;
}
.section-heading h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); }
.section-heading p { margin: 0; color: var(--color-gray-600); }

.card-grid, .category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.article-card, .category-card, .guide-card, .related-site {
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  background: var(--color-white);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.card-link { height: 100%; display: block; padding: 26px; color: inherit; text-decoration: none; }
.card-link h3 { margin: 7px 0 10px; color: var(--color-navy-950); font-size: 1.14rem; line-height: 1.55; }
.card-link p { margin: 0 0 16px; color: var(--color-gray-600); font-size: 0.93rem; }
.article-card:hover, .category-card:hover { transform: translateY(-2px); border-color: #d8c79f; }
.article-card, .category-card { transition: transform 0.2s ease, border-color 0.2s ease; }
.text-link { color: var(--color-navy-700); font-size: 0.88rem; font-weight: 800; }
.category-number { color: var(--color-gold-600); font-family: Georgia, serif; font-size: 0.82rem; letter-spacing: 0.1em; }
.card-meta { color: var(--color-gray-600); font-size: 0.83rem; }

.beginner-route {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--color-white);
  overflow: hidden;
}
.guide-card { padding: 28px; border: 0; border-radius: 0; box-shadow: none; }
.guide-card + .guide-card { border-left: 1px solid var(--color-gray-100); }
.step { color: var(--color-gold-600); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.08em; }
.guide-card h3 { margin: 7px 0; color: var(--color-navy-950); }

.page-header {
  padding: 54px 0 44px;
  border-bottom: 1px solid var(--color-gray-100);
  background: var(--color-white);
}
.page-header h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
.page-description { max-width: 760px; margin: 0; color: var(--color-gray-600); font-size: 1.03rem; }

.breadcrumbs { margin-bottom: 22px; font-size: 0.82rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: 8px; color: var(--color-gray-300); }

.article-shell { padding: 54px 0 80px; }
.article-header { margin-bottom: 34px; }
.article-header h1 {
  margin: 8px 0 14px;
  color: var(--color-navy-950);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2rem, 5vw, 3.15rem);
  line-height: 1.35;
}
.article-description { color: var(--color-gray-600); font-size: 1.05rem; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--color-gray-600); font-size: 0.82rem; }

.toc {
  margin: 34px 0 42px;
  padding: 24px 28px;
  border-left: 4px solid var(--color-gold-600);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--color-white);
}
.toc-title { margin: 0 0 10px; color: var(--color-navy-950); font-weight: 800; }
.toc ol { margin: 0; padding-left: 1.35em; }
.toc li + li { margin-top: 4px; }
.toc .toc-level-3 { margin-left: 1em; font-size: 0.92rem; }

.article-body { font-size: 1.02rem; }
.article-body h2 { margin: 2.6em 0 0.8em; padding-bottom: 0.35em; border-bottom: 1px solid var(--color-gray-300); color: var(--color-navy-950); font-family: "Yu Mincho", serif; font-size: 1.65rem; line-height: 1.5; }
.article-body h3 { margin: 2em 0 0.6em; color: var(--color-navy-900); font-size: 1.2rem; }
.article-body p { margin: 0 0 1.25em; }
.article-body li + li { margin-top: 0.45em; }
.article-body blockquote { margin: 1.8em 0; padding: 14px 20px; border-left: 3px solid var(--color-gold-600); background: var(--color-gold-100); }

.disclaimer-box {
  margin-top: 48px;
  padding: 24px;
  border: 1px solid #ead9b4;
  border-radius: var(--radius-sm);
  background: var(--color-danger-soft);
}
.disclaimer-box h2 { margin: 0 0 8px; color: var(--color-navy-950); font-size: 1.05rem; }
.disclaimer-box p { margin: 0; color: #5b513e; font-size: 0.9rem; }

.related-block { margin-top: 54px; }
.related-block h2 { color: var(--color-navy-950); font-family: "Yu Mincho", serif; }
.related-card-section { margin-top: 46px; padding-top: 24px; border-top: 1px solid var(--color-gray-300); }
.related-card-section h2 { margin: 0 0 16px; color: var(--color-navy-950); font-family: "Yu Mincho", serif; font-size: 1.28rem; }
.related-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.related-card { display: grid; gap: 8px; padding: 18px 20px; border: 1px solid var(--color-gray-300); border-radius: var(--radius-sm); color: inherit; background: var(--color-white); text-decoration: none; }
.related-card:hover { border-color: var(--color-gold-600); }
.related-card.is-cross-site { background: var(--color-gold-100); }
.related-card-meta { color: var(--color-gold-600); font-size: 0.76rem; font-weight: 800; }
.related-card h3 { margin: 0; color: var(--color-navy-950); font-size: 1.03rem; line-height: 1.55; }
.related-card p { margin: 0; color: var(--color-gray-600); font-size: 0.9rem; line-height: 1.7; }
.related-card-cta { color: var(--color-navy-900); font-size: 0.82rem; font-weight: 800; }
.simple-links { padding-left: 1.2em; }
.simple-links li + li { margin-top: 8px; }
.back-link { margin-top: 42px; }

.prose { padding: 54px 0 80px; }
.prose h2 { margin-top: 2.4em; color: var(--color-navy-950); font-family: "Yu Mincho", serif; }
.prose h3 { margin-top: 2em; color: var(--color-navy-900); }

.notice {
  padding: 24px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  background: var(--color-white);
}

.related-sites { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.related-site { padding: 26px; }
.related-site h3 { margin-top: 0; color: var(--color-navy-950); }
.related-site p { color: var(--color-gray-600); }

.site-footer { padding: 48px 0 24px; color: #cbd2da; background: var(--color-navy-950); }
.footer-grid { width: min(calc(100% - 40px), var(--content-width)); margin: 0 auto; display: flex; justify-content: space-between; gap: 40px; }
.footer-brand { margin: 0; color: var(--color-white); font-family: "Yu Mincho", serif; font-size: 1.2rem; font-weight: 700; }
.footer-grid nav { display: grid; grid-template-columns: repeat(2, minmax(130px, 1fr)); gap: 8px 24px; }
.footer-grid a { color: #e1e6ec; font-size: 0.88rem; text-decoration: none; }
.footer-note { width: min(calc(100% - 40px), var(--content-width)); margin: 34px auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.12); font-size: 0.78rem; }

@media (max-width: 860px) {
  .global-nav { display: none; }
  .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 32px; padding: 70px 0; }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-grid { grid-template-columns: 1fr; }
  .beginner-route { grid-template-columns: 1fr; }
  .guide-card + .guide-card { border-top: 1px solid var(--color-gray-100); border-left: 0; }
}

@media (max-width: 580px) {
  body { font-size: 15px; }
  .header-inner { width: min(calc(100% - 28px), var(--content-width)); min-height: 62px; }
  .brand-mark { width: 32px; height: 32px; }
  .hero-inner, .container, .reading-container, .footer-grid, .footer-note { width: min(calc(100% - 28px), var(--content-width)); }
  .hero h1 { font-size: 2.35rem; }
  .section { padding: 58px 0; }
  .card-grid, .related-card-grid { grid-template-columns: 1fr; }
  .footer-grid { display: grid; }
  .footer-grid nav { grid-template-columns: 1fr; }
  .article-header h1 { font-size: 2rem; }
  .toc { padding: 20px; }
}