/* Mobile-first layout with sticky bottom nav */
:root{
  --bg:#ffffff;
  --ink:#0b0f1a;
  --muted:#6b7280;
  --brand:#059669; /* emerald-600 */
  --soft:#f8fafc;
  --border:#e5e7eb;
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,'Noto Sans JP','Hiragino Kaku Gothic ProN',Meiryo,sans-serif;line-height:1.8}
h1,h2,h3{font-weight:800;letter-spacing:.02em}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block;border-radius:14px}
.container{max-width:1100px;margin:0 auto;padding:0 14px}

/* Header */
header{position:sticky;top:0;background:#ffffffd9;backdrop-filter:blur(8px) saturate(140%);border-bottom:1px solid var(--border);z-index:50}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:36px;border-radius:8px}
.brand .title{font-weight:900;font-size:16px}
.menu{display:none;gap:8px}
.menu a{padding:8px 12px;border-radius:999px}
.menu a:hover{background:var(--soft)}
.cta{background:var(--brand);color:#fff;border-radius:999px;padding:8px 14px}

/* Hero */
.hero{display:grid;grid-template-columns:1fr;gap:16px;align-items:center;padding:18px 0 80px}
.badge{display:inline-block;border:1px solid var(--brand);color:var(--brand);padding:4px 10px;border-radius:999px;font-size:12px;letter-spacing:.06em}
.hero h1{font-size:clamp(28px,7vw,46px);line-height:1.12;margin:8px 0}
.hero p{color:var(--muted);margin:8px 0 10px}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{display:inline-block;border:1px solid var(--ink);padding:10px 14px;border-radius:12px}
.btn:hover{background:var(--ink);color:#fff}
.btn.secondary{border-color:var(--border);background:var(--soft)}

/* Sections */
.section{padding:28px 0;border-top:1px solid var(--border)}
.section h2{font-size:clamp(20px,6vw,32px);margin:0 0 6px 0}
.lead{color:var(--muted)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid-3{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:0 1px 0 #eef2f7}
.pad{padding:12px}
.price{font-weight:800}
.notice{background:var(--soft);border:1px dashed var(--border);padding:14px;border-radius:12px}

/* Sticky bottom nav (mobile) */
.bottom-nav{position:fixed;left:0;right:0;bottom:0;background:#ffffff;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--border);z-index:60}
.bottom-nav a{padding:10px 8px;text-align:center;font-size:12px;color:#111827}
.bottom-nav a span{display:block;font-size:18px;margin-bottom:2px}

/* Footer */
footer{background:var(--soft);border-top:1px solid var(--border);margin-top:40px;color:#0f172a}
footer .wrap{display:grid;grid-template-columns:1fr;gap:10px;padding:18px 0}
footer a{color:#0f172a}

/* Tablet & up */
@media (min-width: 760px){
  .menu{display:flex}
  .brand .title{font-size:18px}
  .hero{grid-template-columns:1.1fr .9fr;padding-bottom:40px}
  .grid-3{grid-template-columns:repeat(3,1fr)}
  footer .wrap{grid-template-columns:2fr 1fr 1fr}
  .bottom-nav{display:none}
}