:root{
  --bg:#ffffff;
  --text:#111111;
  --muted:#6b7280;
  --border:#e5e7eb;
  --red:#d7000f;       /* 日の丸っぽい赤 */
  --red2:#ff1a1a;      /* 強い差し色 */
  --card:#ffffff;
  --shadow: 0 10px 25px rgba(0,0,0,.08);
  --radius: 18px;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  color:var(--text);
  background:linear-gradient(180deg,#fff 0%, #fff 60%, #fff5f5 100%);
}

a{ color:inherit; text-decoration:none; }
.container{ width:min(1100px, 92vw); margin:0 auto; }

.topbar{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-weight:800; letter-spacing:.02em;
}
.brand .dot{
  width:34px; height:34px; border-radius:999px;
  background:radial-gradient(circle at 30% 30%, var(--red2), var(--red));
  box-shadow: 0 10px 18px rgba(215,0,15,.25);
}
.navlinks{ display:flex; gap:14px; align-items:center; }
.navlinks a{
  padding:10px 12px; border-radius:12px; color:var(--muted);
}
.navlinks a.active, .navlinks a:hover{
  color:var(--text);
  background:#fff2f2;
}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid var(--border);
  background:#fff;
  font-weight:700;
}
.btn.red{
  background:linear-gradient(180deg, var(--red2), var(--red));
  border-color:transparent;
  color:#fff;
  box-shadow: 0 12px 20px rgba(215,0,15,.25);
}
.btn.ghost{
  background:transparent;
}

.hero{
  padding:26px 0 10px;
}
.heroCard{
  border:1px solid var(--border);
  border-radius: calc(var(--radius) + 6px);
  background:
    radial-gradient(circle at 70% 20%, rgba(215,0,15,.12), transparent 38%),
    radial-gradient(circle at 20% 80%, rgba(255,26,26,.10), transparent 40%),
    #fff;
  box-shadow: var(--shadow);
  padding:22px;
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:18px;
}
.h1{ font-size: clamp(22px, 3vw, 36px); margin:0 0 10px; }
.p{ margin:0; color:var(--muted); line-height:1.6; }

.kpis{ display:grid; grid-template-columns: repeat(3, 1fr); gap:12px; margin-top:16px; }
.kpi{
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:12px;
  background:#fff;
}
.kpi b{ font-size:18px; }
.kpi span{ display:block; color:var(--muted); font-size:12px; margin-top:4px; }

.card{
  border:1px solid var(--border);
  background:var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.section{ padding:18px 0 28px; }
.sectionTitle{ display:flex; align-items:end; justify-content:space-between; gap:12px; margin:0 0 12px; }
.sectionTitle h2{ margin:0; font-size:18px; }
.sectionTitle small{ color:var(--muted); }

.grid{
  display:grid; gap:14px;
  grid-template-columns: repeat(3, 1fr);
}
.item{
  padding:14px;
}
.badges{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:10px; }
.badge{
  font-size:12px; padding:6px 10px; border-radius:999px;
  border:1px solid var(--border); color:var(--muted); background:#fff;
}
.badge.red{ border-color: rgba(215,0,15,.2); color:var(--red); background:#fff0f0; }
.badge.dark{ border-color:#111; color:#111; background:#fff; }

.row{ display:flex; justify-content:space-between; gap:10px; }
.priceLock{
  border:1px dashed rgba(215,0,15,.45);
  background: linear-gradient(180deg, #fff, #fff6f6);
  padding:12px;
  border-radius: var(--radius);
}
.lockMsg{ color:var(--muted); font-size:13px; margin-top:6px; }

.form{
  display:grid; gap:12px;
}
.input, select{
  width:100%;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid var(--border);
  outline:none;
}
.input:focus, select:focus{
  border-color: rgba(215,0,15,.45);
  box-shadow: 0 0 0 4px rgba(215,0,15,.10);
}

.footer{
  padding:26px 0;
  border-top:1px solid var(--border);
  color:var(--muted);
  font-size:13px;
}

@media (max-width: 900px){
  .heroCard{ grid-template-columns: 1fr; }
  .grid{ grid-template-columns: 1fr; }
  .kpis{ grid-template-columns: 1fr; }
  .navlinks{ display:none; }
  .detailGrid{ grid-template-columns: 1fr !important; }
}

.galleryRow{
  display:flex;
  gap:10px;
  margin-top:10px;
  overflow-x:auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}
.galleryRow > div{ flex: 0 0 auto; }