/* assets/css/theme.css */
:root{
  --primary:#1d4ed8;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#f6f8ff;
  --shadow: 0 10px 30px rgba(15,23,42,.10);
  --shadow-sm: 0 6px 18px rgba(15,23,42,.08);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;

  /* header / footer accent (blue, but black text readable) */
  --hf-bg-top:#e3f2ff;
  --hf-bg-bottom:#dbeafe;
  --hf-border:#93c5fd;
  --hf-text:#0f172a;
  --hf-text-muted:#334155;
  --hf-hover:#bfdbfe;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  color:var(--text);
  background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 40%, #ffffff 100%);
}
a{color:var(--primary)}
.container{max-width:1100px;margin:0 auto;padding:0 16px}

.site-header{
  position:sticky;top:0;z-index:20;
  background: linear-gradient(180deg, var(--hf-bg-top) 0%, var(--hf-bg-bottom) 100%);
  border-bottom:1px solid var(--hf-border);
}

.header-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px 0}
.brand{text-decoration:none;color:inherit;display:flex;gap:10px;align-items:center}
.brand-text b{display:block;font-size:14px}
.brand-text span{display:block;font-size:12px;color:var(--hf-text-muted)}
.nav{display:flex;gap:12px;align-items:center}
.nav a{text-decoration:none;color:var(--hf-text);font-weight:700;font-size:13px;padding:8px 10px;border-radius:10px}
.nav a:hover{background:var(--hf-hover);color:var(--hf-text)}
.nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 10px;font-weight:800}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 12px;border-radius:12px;text-decoration:none;font-weight:900;border:1px solid var(--line);
  background:#fff;color:var(--text)
}
.btn.primary{background:var(--primary);border-color:rgba(29,78,216,.25);color:#fff}
.btn.primary:hover{filter:brightness(.98)}
.small{font-size:12px;color:var(--muted)}

.site-footer{
  margin-top:28px;
  border-top:1px solid var(--hf-border);
  background: linear-gradient(180deg, var(--hf-bg-top) 0%, var(--hf-bg-bottom) 100%);
}
.site-footer,
.site-footer a{color:var(--hf-text)}
.site-footer a:hover{
  text-decoration:underline;
}

.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:18px 0}
.footer-title{margin:0 0 8px;font-weight:1000}

@media (max-width: 900px){
  .nav{display:none}
  .nav.is-open{display:flex;flex-direction:column;align-items:stretch;gap:6px;padding:10px 0}
  .nav-toggle{display:inline-flex}
  .footer-grid{grid-template-columns:1fr}
}


/* ===== Footer: hide link column across site (requested) ===== */
.site-footer .footer-grid{
  grid-template-columns: 1fr !important;
}
.site-footer .footer-grid > div:nth-child(2){
  display: none !important;
}