:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #eef3ff;
  --text: #172033;
  --muted: #5f6b84;
  --line: #d9e1f2;
  --brand: #0f4fe6;
  --brand-2: #0da6c2;
  --brand-dark: #0b2a6b;
  --max: 1120px;
  --shadow: 0 20px 50px rgba(23, 32, 51, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(15, 79, 230, 0.14), transparent 62%),
    radial-gradient(900px 480px at 100% 0%, rgba(13, 166, 194, 0.12), transparent 65%),
    var(--bg);
  line-height: 1.7;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(var(--max), 92vw); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 40; backdrop-filter: blur(10px); background: rgba(245,247,251,.85); border-bottom: 1px solid rgba(23,32,51,.08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 72px; }
.brand { font-family: "Manrope", "Noto Sans JP", sans-serif; font-weight: 800; font-size: 1.12rem; letter-spacing: .02em; color: var(--brand-dark); }
.nav { display: flex; gap: 14px; flex-wrap: wrap; justify-content: flex-end; }
.nav a { display: inline-flex; align-items: center; padding: 8px 12px; border-radius: 999px; font-size: .92rem; color: var(--muted); transition: .2s ease; }
.nav a:hover, .nav a.active { color: var(--brand-dark); background: rgba(15,79,230,.1); text-decoration: none; }
main { padding: 48px 0 72px; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: 28px; align-items: center; padding: 42px; border-radius: 28px; background: linear-gradient(135deg, rgba(15,79,230,.08), rgba(13,166,194,.16)); border: 1px solid rgba(15,79,230,.12); box-shadow: var(--shadow); }
.hero h1 { margin: 0; font-family: "Manrope", "Noto Sans JP", sans-serif; font-size: clamp(2rem,4vw,3.3rem); line-height: 1.12; color: var(--brand-dark); }

.hero-media img {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  display: block;
}
.hero-visual { height: 260px; border-radius: 18px; background: linear-gradient(135deg, #1b54d8, #1aa9bd); box-shadow: inset 0 0 0 1px rgba(255,255,255,.35); display: grid; place-items: center; color: #fff; font-family: "Manrope", sans-serif; font-size: clamp(1.1rem,2.5vw,1.8rem); font-weight: 800; letter-spacing: .06em; }
.tag { display: inline-flex; align-items: center; padding: 6px 12px; border-radius: 999px; font-size: .78rem; letter-spacing: .05em; text-transform: uppercase; color: #fff; background: linear-gradient(90deg, var(--brand), var(--brand-2)); }
.stack { margin-top: 16px; display: grid; gap: 14px; }
.stack strong { display: block; color: var(--brand-dark); font-size: .94rem; }
.stack span { color: var(--text); font-size: 1.08rem; }
.section { margin-top: 38px; padding: 30px; border-radius: 20px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.section h2 { margin: 0 0 14px; font-family: "Manrope", "Noto Sans JP", sans-serif; font-size: clamp(1.4rem,2.2vw,2rem); color: var(--brand-dark); }
.section h3 { margin: 16px 0 10px; color: #233258; font-size: 1.16rem; }
.section p, .section li, .section dd { color: #2f3d61; }
.news-year { border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); overflow: hidden; margin-bottom: 12px; }
.news-year summary { list-style: none; cursor: pointer; padding: 14px 16px; font-weight: 700; color: var(--brand-dark); }
.news-year summary::-webkit-details-marker { display: none; }
.news-list { margin: 0; padding: 0 16px 16px; list-style: none; display: grid; gap: 10px; }
.news-item { display: grid; grid-template-columns: 94px 1fr; gap: 12px; }
.news-date { font-family: "Manrope", sans-serif; color: var(--brand-dark); font-weight: 700; }
.grid-2 { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; }
.card { padding: 18px; background: var(--surface-soft); border: 1px solid var(--line); border-radius: 14px; }
dl.table { margin: 0; display: grid; grid-template-columns: 190px 1fr; gap: 8px 18px; }
dl.table dt { margin: 0; font-weight: 700; color: var(--brand-dark); }
dl.table dd { margin: 0; }
.site-footer { border-top: 1px solid rgba(23,32,51,.1); background: rgba(255,255,255,.75); }
.footer-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 18px; color: var(--muted); font-size: .92rem; }
.notice { display: inline-block; margin-top: 10px; padding: 8px 12px; border-radius: 10px; border: 1px solid #c5d4fb; background: #edf3ff; color: #203260; font-size: .92rem; }
.cta { display: inline-flex; margin-top: 12px; padding: 11px 16px; border-radius: 12px; background: linear-gradient(90deg,var(--brand),var(--brand-2)); color: #fff; font-weight: 700; }
.cta:hover { text-decoration: none; filter: brightness(1.03); }
@media (max-width:960px){ .hero{grid-template-columns:1fr;padding:26px;} .grid-2{grid-template-columns:1fr;} dl.table{grid-template-columns:1fr;gap:2px;} .news-item{grid-template-columns:1fr;gap:2px;} }
@media (max-width:620px){ .header-inner{flex-direction:column;align-items:flex-start;padding:12px 0;} .nav{width:100%;justify-content:flex-start;} main{padding-top:28px;} .section{padding:22px;} .footer-inner{min-height:52px;} }