/* Simple responsive style for the DELF B2 preparation site */
:root{
  --max-width:1000px;
  --accent:#2b6cb0;
  --muted:#666;
  --bg:#f7fbff;
  --card:#ffffff;
}
*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial;line-height:1.5;color:#222;margin:0;background:var(--bg)}
.container{max-width:var(--max-width);margin:0 auto;padding:1.25rem}
.site-header{background:linear-gradient(180deg,rgba(43,108,176,0.95),rgba(43,108,176,0.85));color:#fff;padding:2.25rem 0;text-align:center}
.site-header h1{margin:0 0 .25rem;font-size:1.9rem}
.tagline{opacity:.95;margin:0 0 1rem}
.btn{display:inline-block;padding:.6rem 1rem;border-radius:6px;text-decoration:none;border:1px solid transparent;background:transparent;color:var(--accent);cursor:pointer}
.btn.primary{background:#fff;color:var(--accent);font-weight:600}
.card{background:var(--card);padding:1rem;margin:1.25rem 0;border-radius:8px;box-shadow:0 6px 18px rgba(30,30,30,0.06)}
.columns{display:grid;grid-template-columns:1fr;gap:1rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1rem}
.plan{padding:.75rem;border-radius:6px;border:1px solid #eee;background:linear-gradient(180deg,#fff,#fbfdff)}
.plan.highlighted{border-color:var(--accent);box-shadow:0 6px 18px rgba(43,108,176,0.08)}

blockquote{margin:0.5rem 0;padding-left:1rem;border-left:4px solid var(--accent);color:var(--muted)}

label{display:block;margin-top:.6rem;font-weight:600}
input,textarea{width:100%;padding:.6rem;margin-top:.25rem;border-radius:6px;border:1px solid #ddd}
.site-footer{padding:1rem 0;text-align:center;font-size:.9rem;color:var(--muted)}

/* Responsive */
@media(min-width:760px){
  .columns{grid-template-columns:1fr 1fr}
  .site-header h1{font-size:2.4rem}
}