:root{
  --navy:#19448e;
  --navy-dark:#102f63;
  --ink:#1f2733;
  --muted:#5b6675;
  --line:#e6e9ef;
  --bg-soft:#f5f7fb;
  --radius:14px;
  --maxw:980px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans JP",system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Meiryo",sans-serif;
  color:var(--ink);
  line-height:1.8;
  background:#fff;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--navy);text-decoration:none;}
a:hover{text-decoration:underline;}
img{display:block;max-width:100%;}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* Header */
.site-header{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1rem;color:var(--ink);}
.brand:hover{text-decoration:none;}
.brand img{border-radius:6px;}
.site-nav{display:flex;gap:24px;font-size:.92rem;}
.site-nav a{color:var(--muted);font-weight:500;}
.site-nav a:hover{color:var(--navy);text-decoration:none;}

/* Hero */
.hero{
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-dark) 100%);
  color:#fff;
  padding:96px 0 104px;
}
.hero-eyebrow{margin:0 0 14px;font-size:.95rem;letter-spacing:.08em;color:#c7d4ee;}
.hero-title{margin:0 0 24px;font-size:clamp(1.9rem,5vw,3rem);line-height:1.35;font-weight:700;}
.hero-lead{margin:0 0 36px;max-width:680px;font-size:1.05rem;color:#e7edf8;}
.btn{
  display:inline-block;background:#fff;color:var(--navy);
  padding:13px 30px;border-radius:999px;font-weight:700;font-size:.98rem;
  transition:transform .15s ease,box-shadow .15s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.18);}

/* Sections */
section{padding:80px 0;}
.section-title{
  margin:0 0 44px;font-size:1.6rem;font-weight:700;text-align:center;position:relative;
}
.section-title::after{
  content:"";display:block;width:48px;height:3px;background:var(--navy);
  margin:14px auto 0;border-radius:2px;
}

/* Service cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 26px;transition:transform .18s ease,box-shadow .18s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(25,68,142,.12);}
.card h3{
  margin:0 0 14px;font-size:1.18rem;color:var(--navy);
  padding-bottom:12px;border-bottom:2px solid var(--bg-soft);
}
.card p{margin:0;font-size:.95rem;color:var(--muted);}

/* About */
.about{background:var(--bg-soft);}
.about-list{max-width:620px;margin:0 auto;display:grid;gap:0;}
.about-list>div{
  display:grid;grid-template-columns:120px 1fr;gap:16px;
  padding:18px 4px;border-bottom:1px solid var(--line);
}
.about-list>div:last-child{border-bottom:none;}
.about-list dt{margin:0;font-weight:700;color:var(--navy);}
.about-list dd{margin:0;}

/* Footer */
.site-footer{background:var(--navy-dark);color:#c7d4ee;padding:28px 0;text-align:center;}
.site-footer p{margin:0;font-size:.85rem;}

/* Responsive */
@media (max-width:760px){
  .site-nav{gap:16px;font-size:.82rem;}
  .hero{padding:72px 0 80px;}
  section{padding:60px 0;}
  .cards{grid-template-columns:1fr;}
  .about-list>div{grid-template-columns:90px 1fr;gap:10px;}
}
@media (max-width:420px){
  .site-nav a:nth-child(1){display:none;}
}