/* === Responsive adjustments (added) === */
:root{
  --font-base: 16px;
}

body{
  font-size: var(--font-base);
}

@media (max-width: 768px){
  body{
    font-size: 15px;
  }
  h1{font-size: 1.6rem;}
  h2{font-size: 1.3rem;}
  h3{font-size: 1.1rem;}

  .container{
    padding-left: 14px;
    padding-right: 14px;
  }

  .nav{
    display: none;
    flex-direction: column;
    gap: 10px;
    background: #eef5ff;
    padding: 12px;
    border-radius: 12px;
    margin-top: 8px;
  }
  .nav.open{
    display: flex;
  }

  .nav-toggle{
    display: inline-block;
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 14px;
  }
}

/* Desktop: hide toggle */
@media (min-width: 769px){
  .nav-toggle{
    display: none;
  }
}