/* Modern responsive styles for index.html */
:root{
  --bg:#f6f8fb;
  --card:#ffffff;
  --accent:#2b6cb0;
  --muted:#6b7280;
  --radius:10px;
}
body{
  font-family: 'Noto Sans JP', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  background:var(--bg);
  color:#111827;
  margin:0;
}
.container{
  margin:0 auto;
}
.inner{
  max-width:1100px;
  margin:24px auto;
  padding:16px;
}
.full-bleed{ /* horizontal band that stretches full width */
  width:100%;
}
.full-bleed .inner{ /* slightly tighter padding for bands */
  margin:12px auto;
  padding:12px 16px;
}
header{
  background:linear-gradient(90deg, rgba(43,108,176,0.95), rgba(78,115,179,0.95));
  color:#fff;
  border-radius:var(--radius);
  box-shadow:0 6px 18px rgba(15,23,42,0.08);
}
header h1{margin:0;font-weight:700;letter-spacing:0.5px}
header .brand, header a.brand{color:inherit;text-decoration:none;display:inline-block}
header a.brand:focus{outline:2px solid rgba(255,255,255,0.3);outline-offset:3px}
nav{margin-top:12px}
nav ul{
  display:flex;
  gap:10px;
  list-style:none;
  padding:0;
  margin:0;
  flex-wrap:nowrap; /* keep items in a single row */
  overflow-x:auto; /* allow horizontal scroll on very small viewports */
  -webkit-overflow-scrolling: touch;
  justify-content:space-between; /* spread items across the full width */
}
nav a{
  display:inline-block;
  padding:10px 14px;
  background:var(--card);
  color:var(--accent);
  border-radius:8px;
  text-decoration:none;
  font-weight:600;
  border:1px solid rgba(43,108,176,0.08);
  white-space:nowrap; /* prevent label wrap */
  flex:1 1 0; /* expand to fill available space */
  text-align:center;
}
nav a:hover{background:var(--accent);color:#fff}
article{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:18px}
article section{background:var(--card);padding:14px;border-radius:10px;box-shadow:0 4px 12px rgba(15,23,42,0.04)}
article .date{display:block;color:#fff;font-size:13px;margin-bottom:8px}
footer{margin-top:16px;text-align:center;color:var(--muted);font-size:13px}
@media (max-width:640px){
  nav ul{justify-content:center}
  header, .container{padding:12px}
}