*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --teal: #4EA99E; --teal-light: #3DB8A9; --teal-soft: #E8F5F3; --teal-bg: #F0FAF8;
  --white: #FFFFFF; --warm-white: #FAFAF8; --sand: #F7F0E4; --sand-light: #FBF7F0;
  --dark: #1A1A1A; --dark-secondary: #3A3A3A; --gray: #6B6B6B; --gray-light: #9A9A9A; --gray-border: #E8E8E4;
  --serif: 'Shippori Mincho B1', 'YuMincho', serif; --serif-en: 'DM Serif Display', 'Georgia', serif;
  --sans: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', sans-serif; --sans-en: 'DM Sans', sans-serif;
  --nav-height: 72px;
}
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--sans); font-weight: 400; color: var(--dark); background: var(--warm-white); line-height: 1.8; font-size: 15px; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* NAV */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: var(--nav-height); display: flex; align-items: center; background: rgba(250,250,248,0.92); backdrop-filter: blur(20px); box-shadow: 0 1px 0 rgba(0,0,0,0.06); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.nav__logo { font-family: var(--serif); font-size: 17px; font-weight: 500; letter-spacing: 0.1em; color: var(--dark); }
.nav__logo span { font-weight: 600; }
.nav__links { display: flex; gap: 32px; list-style: none; }
.nav__links a { font-size: 13px; color: var(--dark-secondary); transition: color 0.3s; position: relative; }
.nav__links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1px; background: var(--teal); transition: width 0.3s; }
.nav__links a:hover { color: var(--teal); }
.nav__links a:hover::after { width: 100%; }
.nav__hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; background: none; border: none; }
.nav__hamburger span { display: block; width: 20px; height: 1.5px; background: var(--dark); transition: transform 0.3s, opacity 0.3s; }
.nav__hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(4px,4px); }
.nav__hamburger.active span:nth-child(2) { opacity: 0; }
.nav__hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }
.nav__mobile { display: none; position: fixed; top: var(--nav-height); left: 0; right: 0; bottom: 0; background: rgba(250,250,248,0.98); backdrop-filter: blur(20px); z-index: 999; padding: 40px 24px; }
.nav__mobile.active { display: flex; flex-direction: column; }
.nav__mobile a { font-size: 18px; padding: 20px 0; border-bottom: 1px solid var(--gray-border); display: block; }

/* BREADCRUMB */
.breadcrumb { padding-top: calc(var(--nav-height) + 32px); padding-bottom: 16px; }
.breadcrumb__list { display: flex; align-items: center; gap: 8px; list-style: none; font-size: 13px; color: var(--gray-light); }
.breadcrumb__list a { color: var(--gray-light); transition: color 0.3s; }
.breadcrumb__list a:hover { color: var(--teal); }

/* ARTICLE */
.article { max-width: 800px; margin: 0 auto; padding: 40px 24px 120px; }
.article__date { font-family: var(--sans-en); font-size: 14px; color: var(--gray-light); margin-bottom: 16px; }
.article__title { font-family: var(--serif); font-size: clamp(24px, 4vw, 36px); font-weight: 600; line-height: 1.6; letter-spacing: 0.04em; margin-bottom: 40px; color: var(--dark); }
.article__body h2 { font-family: var(--serif); font-size: 22px; font-weight: 600; margin: 48px 0 20px; padding-bottom: 12px; border-bottom: 2px solid var(--teal-soft); color: var(--dark); }
.article__body h3 { font-size: 18px; font-weight: 600; margin: 32px 0 16px; padding-left: 16px; border-left: 3px solid var(--teal); color: var(--dark); }
.article__body p { margin-bottom: 20px; line-height: 2; color: var(--dark-secondary); }
.article__body ul { margin: 16px 0 24px 24px; }
.article__body li { margin-bottom: 8px; line-height: 1.9; color: var(--dark-secondary); }
.article__body strong { color: var(--dark); font-weight: 600; }
.article__body em { color: var(--teal); font-style: normal; font-weight: 500; }

/* CTA BOX */
.article-cta { background: linear-gradient(135deg, var(--teal-bg) 0%, var(--teal-soft) 100%); border-radius: 12px; padding: 40px 32px; text-align: center; margin-top: 48px; }
.article-cta__title { font-family: var(--serif); font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.article-cta__desc { font-size: 14px; color: var(--gray); margin-bottom: 24px; line-height: 1.9; }
.article-cta__btn { display: inline-block; background: var(--teal); color: var(--white); padding: 14px 40px; border-radius: 8px; font-weight: 500; font-size: 15px; transition: background 0.3s, transform 0.3s; }
.article-cta__btn:hover { background: var(--teal-light); transform: translateY(-2px); }

/* RELATED */
.related { max-width: 800px; margin: 0 auto; padding: 0 24px 80px; }
.related__title { font-size: 16px; font-weight: 600; margin-bottom: 20px; }
.related__list { list-style: none; }
.related__item { padding: 16px 0; border-bottom: 1px solid var(--gray-border); }
.related__item a { display: flex; justify-content: space-between; align-items: center; gap: 16px; transition: color 0.3s; }
.related__item a:hover { color: var(--teal); }
.related__item-date { font-family: var(--sans-en); font-size: 13px; color: var(--gray-light); flex-shrink: 0; }

/* FOOTER */
.footer { padding: 80px 0 40px; background: #F2F2EF; }
.footer__inner { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 64px; }
.footer__logo { font-size: 16px; font-weight: 600; letter-spacing: 0.06em; margin-bottom: 16px; }
.footer__brand-desc { font-size: 13px; color: var(--gray); line-height: 1.9; }
.footer__col-title { font-size: 12px; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 20px; }
.footer__col-links { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer__col-links a { font-size: 13px; color: var(--gray); transition: color 0.3s; }
.footer__col-links a:hover { color: var(--teal); }
.footer__bottom { display: flex; justify-content: space-between; padding-top: 32px; border-top: 1px solid var(--gray-border); }
.footer__copy { font-family: var(--sans-en); font-size: 12px; color: var(--gray-light); }

@media (max-width: 768px) {
  :root { --nav-height: 60px; }
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; gap: 16px; text-align: center; }
  .article-cta { padding: 32px 20px; }
}