/* ===== PROBLEMS ===== */
  .section-head{max-width:600px;margin-bottom:64px;}
  .section-head .lede{margin-top:16px;}
  .problems-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:24px;
  }
  .p-card{
    background:#fff;
    border:1px solid var(--hairline);
    border-radius:var(--r-md);
    padding:32px;
    transition:transform .3s var(--ease), box-shadow .3s var(--ease);
  }
  .p-card:hover{
    transform:translateY(-5px);
    box-shadow:0 24px 48px -20px rgba(14,21,38,0.14);
  }
  .icon-tile{
    width:46px;height:46px;
    border-radius:var(--r-sm);
    background:linear-gradient(155deg, var(--blue), #2540C9);
    display:flex;align-items:center;justify-content:center;
    box-shadow:0 10px 20px -6px rgba(52,87,255,0.45);
    margin-bottom:20px;
  }
  .icon-tile svg{color:#fff;}
  .p-card h3{margin-bottom:10px;}