:root{
  --maxw: 1040px;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(0,0,0,.08);
  --border: 1px solid rgba(15,23,42,.12);
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #1d4ed8;
  --accent-2: #0ea5e9;
  --ok: #16a34a;
  --ng: #dc2626;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family: system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;
  line-height:1.75;
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(29,78,216,.20), transparent 60%),
    radial-gradient(900px 500px at 90% 0%, rgba(14,165,233,.16), transparent 55%),
    var(--bg);
}

a{color:inherit;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 18px;}
small{color:var(--muted);}

.header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:saturate(160%) blur(10px);
  background:rgba(246,247,251,.78);
  border-bottom:1px solid rgba(15,23,42,.10);
}
.header .container{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:12px 18px;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;}
.brand-badge{
  width:34px;height:34px;border-radius:10px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 10px 25px rgba(29,78,216,.18);
}
.brand-name{font-weight:800;letter-spacing:.02em;}
.nav{display:flex;gap:8px;flex-wrap:wrap;align-items:center;}
.nav a{
  text-decoration:none;
  padding:8px 12px;
  border-radius:999px;
  color:var(--muted);
}
.nav a:hover{background:rgba(15,23,42,.06);color:var(--text);}
.nav a.primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;
  box-shadow:0 12px 28px rgba(29,78,216,.22);
}

main{padding:22px 0 44px;}
.hero{
  border:var(--border);
  border-radius:calc(var(--radius) + 6px);
  background:
    radial-gradient(800px 380px at 15% 15%, rgba(29,78,216,.18), transparent 55%),
    radial-gradient(700px 360px at 90% 20%, rgba(14,165,233,.14), transparent 60%),
    rgba(255,255,255,.88);
  box-shadow:var(--shadow);
  padding:26px 22px;
}
.hero h1{margin:0 0 8px;font-size:32px;line-height:1.25;}
.hero p{margin:0;color:var(--muted);max-width:68ch;}
.kv-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px;}
.pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  border:1px solid rgba(15,23,42,.10);
  background:rgba(255,255,255,.75);
  color:var(--muted);
  font-size:13px;
}
.pill i{display:inline-block;width:8px;height:8px;border-radius:99px;background:var(--accent);}

.grid{
  margin-top:18px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:14px;
}
.card{
  grid-column:span 6;
  border:var(--border);
  border-radius:var(--radius);
  background:rgba(255,255,255,.92);
  box-shadow:var(--shadow);
  padding:18px;
}
@media (max-width:820px){
  .card{grid-column:span 12;}
  .hero h1{font-size:28px;}
}
.card h2{margin:0 0 6px;font-size:18px;}
.card p{margin:0;color:var(--muted);}
.card .actions{margin-top:14px;display:flex;gap:10px;flex-wrap:wrap;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  text-decoration:none;
  padding:11px 14px;
  border-radius:14px;
  border:1px solid rgba(15,23,42,.14);
  background:rgba(255,255,255,.9);
  color:var(--text);
  font-weight:800;
}
.btn:hover{transform:translateY(-1px);box-shadow:0 14px 36px rgba(0,0,0,.10);}
.btn.primary{
  border:none;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;
}
.btn.ghost{background:transparent;}
.btn.small{padding:8px 10px;border-radius:12px;font-weight:700;font-size:13px;}
.btn:focus{outline:3px solid rgba(29,78,216,.25);outline-offset:2px;}

.section-title{
  margin:22px 0 10px;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
}
.section-title h2{margin:0;font-size:18px;}
.section-title .hint{color:var(--muted);font-size:13px;}

.quiz{
  border:var(--border);
  border-radius:var(--radius);
  background:rgba(255,255,255,.92);
  box-shadow:var(--shadow);
  padding:18px;
}
.q-item{padding:14px;border-radius:16px;border:1px solid rgba(15,23,42,.10);background:rgba(255,255,255,.75);margin-bottom:12px;}
.q-item:last-child{margin-bottom:0;}
.q-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;}
.q-title{margin:0;font-size:16px;line-height:1.4;}
.tag{display:inline-block;padding:4px 8px;border-radius:999px;border:1px solid rgba(15,23,42,.12);font-size:12px;color:var(--muted);white-space:nowrap;}
.opts{margin-top:10px;display:grid;gap:8px;}
.opt{
  display:flex;gap:10px;align-items:flex-start;
  padding:10px 10px;border-radius:14px;
  border:1px solid rgba(15,23,42,.10);
  background:rgba(255,255,255,.85);
}
.opt:hover{border-color:rgba(29,78,216,.35);}
.opt input{margin-top:4px;}
.opt span{display:block;}
.opt .muted{color:var(--muted);font-size:13px;margin-top:2px;}

.toolbar{
  display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:space-between;
  margin-top:14px;
}
.progress{
  flex:1;
  height:10px;
  border-radius:999px;
  background:rgba(15,23,42,.10);
  overflow:hidden;
  min-width:180px;
}
.progress > div{
  height:100%;
  width:0%;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
}

.result{
  border:var(--border);
  border-radius:var(--radius);
  background:rgba(255,255,255,.92);
  box-shadow:var(--shadow);
  padding:18px;
}
.score{
  display:flex;gap:12px;flex-wrap:wrap;align-items:center;justify-content:space-between;
  margin-bottom:10px;
}
.score strong{font-size:22px;}
.badges{display:flex;gap:8px;flex-wrap:wrap;}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  border:1px solid rgba(15,23,42,.12);
  background:rgba(255,255,255,.75);
  font-weight:700;
}
.badge.ok i{background:var(--ok);}
.badge.ng i{background:var(--ng);}
.badge i{width:10px;height:10px;border-radius:99px;display:inline-block;background:var(--accent);}

.callout{
  margin-top:12px;
  padding:14px;
  border-radius:16px;
  border:1px solid rgba(29,78,216,.20);
  background:rgba(29,78,216,.06);
}
.callout h3{margin:0 0 6px;font-size:16px;}
.callout p{margin:0;color:var(--muted);}

.links{
  display:grid;gap:10px;margin-top:12px;
}
.link-card{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:12px 14px;border-radius:16px;
  border:1px solid rgba(15,23,42,.12);
  background:rgba(255,255,255,.80);
  text-decoration:none;
}
.link-card:hover{border-color:rgba(29,78,216,.35);}
.link-card .sub{color:var(--muted);font-size:13px;margin-top:2px;}
.link-card .arrow{font-weight:900;color:var(--muted);}

.footer{
  border-top:1px solid rgba(15,23,42,.10);
  padding:18px 0;
  color:var(--muted);
}
.footer .container{display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:space-between;}