:root{
  --bg:#0b1220;
  --card:#111a2e;
  --text:#e7e9ee;
  --muted:#aab0c0;
  --line:rgba(255,255,255,.12);
  --accent:#6ee7ff;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: "Noto Sans JP", sans-serif;
  color:var(--text);
  background:var(--bg);
}

.container{max-width:1100px;margin:0 auto;padding:0 16px}
a{color:inherit;text-decoration:none}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:16px;top:16px;background:#000;padding:8px 12px;border-radius:10px}

.site-header{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(10px);
  background: rgba(11,18,32,.7);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:12px}
.brand{display:flex;align-items:baseline;gap:8px;font-weight:700}
.brand-mark{font-size:18px}
.brand-sub{font-size:14px;color:var(--muted)}

.site-nav{display:flex;gap:16px;align-items:center}
.nav-link{color:var(--muted)}
.nav-cta{padding:10px 14px;border:1px solid var(--line);border-radius:999px;color:var(--text)}
.nav-toggle{display:none}

.site-footer{border-top:1px solid var(--line);margin-top:48px}
.footer-top{display:flex;justify-content:space-between;gap:24px;padding:28px 0}
.footer-links{display:flex;flex-direction:column;gap:10px;color:var(--muted)}
.footer-bottom{padding:14px 0;color:var(--muted);border-top:1px solid var(--line)}

@media (max-width: 820px){
  .site-nav{display:none}
  .nav-toggle{display:inline-flex;flex-direction:column;gap:5px;background:transparent;border:0}
  .nav-toggle__line{width:24px;height:2px;background:var(--text);opacity:.9;border-radius:999px}
  .sp-nav{padding:12px 0}
  .sp-link{display:block;padding:12px 0;border-top:1px solid var(--line);color:var(--muted)}
  .sp-cta{color:var(--text)}
}
/* 記事カードの小タイトル */
.card-subtitle {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: #666;
}
.card-articles{
  margin-top: 10px;
  padding-left: 18px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(255,255,255,.78);
}

.card-articles li{
  margin: 3px 0;
  list-style: disc;
  opacity: .95;
}
.cards {
  overflow-x: auto;
  display: flex;
}