:root{
  --bg:#fafaf8;--ink:#1f2328;--muted:#5f6773;--line:#dfe3ea;--card:#fff;--primary:#374151;--accent:#0f766e;
  --shadow:0 12px 24px rgba(31,35,40,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI","Noto Sans JP",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
a{color:inherit;text-decoration:none}
img{width:100%;display:block;border-radius:14px;object-fit:cover}
.header{
  position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 18px;background:rgba(250,250,248,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(6px)
}
.logo{font-weight:800}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px 9px}
.nav{display:flex;gap:10px;font-size:.92rem}
.nav a{color:var(--muted);padding:6px 9px;border-radius:6px}
.nav a.active,.nav a:hover{background:#eef1f7;color:#1f2a44}

.container{max-width:1160px;margin:0 auto;padding:24px 16px 70px;display:grid;gap:14px}
.hero{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:center}
.hero-text,.card,.side,.tile{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.hero-text{padding:18px}
.hero img{height:320px}
.label{font-size:.82rem;color:var(--accent);letter-spacing:1px;text-transform:uppercase}
h1,h2,h3{margin:0 0 10px;line-height:1.3}
h1{font-size:clamp(1.8rem,3.1vw,2.7rem)}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.btn{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 12px}
.btn.primary{background:#111827;color:#fff;border-color:#111827}

.strip{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.strip span{border:1px solid #d8dde8;background:#f6f8fc;border-radius:999px;padding:7px 10px;text-align:center;font-size:.86rem}

.layout{display:grid;grid-template-columns:280px 1fr;gap:12px}
.side{padding:14px}
.mode-list{display:flex;flex-wrap:wrap;gap:8px}
.mode{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 10px;cursor:pointer}
.mode.active{background:#e7f6f2;border-color:#bde9df;color:#0f5f57}
.content{display:grid;gap:12px}
.card{padding:16px}

.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.tile{padding:10px}
.tile img{height:170px;margin-bottom:8px}

.progress{height:10px;background:#dde5f4;border-radius:999px;overflow:hidden}
#progressBar{width:0;height:100%;background:linear-gradient(90deg,#111827,#06b6d4);transition:.3s}
.muted{color:var(--muted)}
.checklist{display:grid;gap:8px}
.checklist label{border:1px solid var(--line);border-radius:10px;padding:8px 10px;background:#fff}

.footer{text-align:center;color:var(--muted);padding:20px;border-top:1px solid var(--line)}
.top-btn{position:fixed;right:16px;bottom:16px;width:40px;height:40px;border:0;border-radius:999px;background:#111827;color:#fff;display:none;cursor:pointer}
.top-btn.show{display:block}
.reveal{opacity:0;transform:translateY(14px);transition:.45s}.reveal.show{opacity:1;transform:translateY(0)}

@media (max-width:960px){
  .hero,.strip,.layout,.gallery{grid-template-columns:1fr}
  .menu-btn{display:block}
  .nav{display:none;position:absolute;right:16px;top:54px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px;flex-direction:column}
  .nav.open{display:flex}
}