:root {
  --navy-950: #011D4D;
  --navy-900: #023A8D;
  --navy-800: #1656B0;
  --navy-700: #2A7AD6;
  --red: #FFD500;
  --cream: #F5F1EA;
  --white: #FFFFFF;
  --text: #141820;
  --text-muted: #5A6270;
  --line: #D9D4C9;
  --ff-label-en: "Bebas Neue", sans-serif;
  --ff-heading: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  --ff-body: "Noto Sans JP", sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--ff-body); color: var(--text); background: var(--white); line-height: 1.8; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }

/* NAV */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0;
  background: rgba(2, 58, 141, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav .inner { max-width: 1240px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { color: var(--white); font-family: var(--ff-heading); font-weight: 900; font-size: 16px; letter-spacing: 0.02em; }
.nav-back {
  color: var(--white); font-size: 13px; font-weight: 700;
  display: flex; align-items: center; gap: 6px; opacity: 0.85;
  transition: opacity 0.2s;
}
.nav-back:hover { opacity: 1; }

/* ARTICLE */
.article-wrap { max-width: var(--container); margin: 0 auto;max-width:780px; padding: 120px 24px 80px; }
.article-tag {
  display: inline-block; background: var(--navy-900); color: var(--white);
  font-family: var(--ff-label-en); font-size: 11px; letter-spacing: 0.12em;
  padding: 3px 10px; border-radius: 2px; margin-bottom: 20px;
}
.article-title {
  font-family: var(--ff-heading); font-weight: 900;
  font-size: clamp(22px, 4vw, 32px); line-height: 1.4;
  color: var(--navy-900); margin-bottom: 12px;
  padding-bottom: 20px; border-bottom: 2px solid var(--red);
}
.article-date { font-size: 13px; color: var(--text-muted); margin-bottom: 40px; }

.article-body { font-size: 15px;padding:0; line-height: 1.9; color: var(--text); }
.article-body h2 {
  font-family: var(--ff-heading); font-weight: 900; font-size: 18px;
  color: var(--navy-900); margin: 40px 0 14px;
  padding-left: 12px; border-left: 4px solid var(--red);
}
.article-body p { margin-bottom: 20px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 14px; }
.article-body th { background: var(--navy-900); color: var(--white); padding: 10px 16px; text-align: left; font-weight: 700; }
.article-body td { padding: 10px 16px; border-bottom: 1px solid var(--line); }
.article-body tr:last-child td { border-bottom: none; }

.btn-back {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 56px; padding: 14px 28px;
  background: var(--navy-900); color: var(--white);
  font-family: var(--ff-heading); font-weight: 700; font-size: 14px;
  border-radius: 2px; transition: background 0.2s;
}
.btn-back:hover { background: var(--navy-800); }

@media (max-width: 640px) {
  .article-wrap { padding: 100px 20px 60px; }
  .article-body table { font-size: 13px; }
  .article-body th, .article-body td { padding: 8px 12px; }
}