:root{
  --bg:#f6f8fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:rgba(0,0,0,0.08);
  --accent:#0ea5e9;
  --accent2:#7c3aed;
  --shadow:0 10px 30px rgba(17,24,39,0.10);
  --rad:14px;
}

/* reset */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,
  "Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
}

/* layout */
.wrap{max-width:1200px;margin:auto;padding:0 18px}
section{padding:56px 0}
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100}
footer{border-top:1px solid var(--line);background:#fff}

/* header */
.head{display:flex;align-items:center;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.logo{width:36px;height:36px;border-radius:50%;background:var(--accent)}
.title .tiny{font-weight:400;color:var(--muted)}
nav ul{display:flex;gap:12px;list-style:none;margin:0;padding:0}
nav a{padding:8px 10px;border-radius:10px;color:inherit;text-decoration:none}
nav a:hover{background:rgba(14,165,233,0.08)}
details .menu{position:absolute;background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow);border-radius:12px;padding:8px;display:grid;gap:6px}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 14px;border-radius:12px;
  border:1px solid var(--line);background:#fff;
  color:inherit;text-decoration:none
}
.btn:hover{box-shadow:var(--shadow)}
.btn.pri{background:var(--accent);color:#fff;border-color:transparent}
.btn.acc{background:#111827;color:#fff;border-color:transparent}

/* hero */
.hero{background:#fff}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:center}
.headline{font-size:clamp(26px,4vw,40px);line-height:1.35;margin:.2em 0}
.lead{color:var(--muted)}
.mock img{width:100%;border-radius:var(--rad);box-shadow:var(--shadow)}

/* chips */
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  padding:4px 10px;border-radius:999px;
  border:1px solid var(--line);font-size:13px;background:#fff
}

/* cards / grid */
.grid{display:grid;gap:20px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--rad);
  padding:20px;
  box-shadow:var(--shadow)
}
.muted{color:var(--muted)}
.tiny{font-size:13px;color:var(--muted)}

/* responsive */
@media (max-width:900px){
  .hero .wrap{grid-template-columns:1fr}
  .grid.cols-2,.grid.cols-3{grid-template-columns:1fr}
}