<style>
  :root{
    --violet:#5a2d82;
    --violet-2:#7838a7;
    --glass: rgba(255,255,255,.08);
    --glass-hr: rgba(255,255,255,.14);
    --txt:#f5f7ff;
    --txt-dim:#e6e6ff;
    --accent:#c9b7ff;
    --radius:18px;
    --blur:18px;
    --shadow: 0 10px 30px rgba(0,0,0,.35);
  }
  *{box-sizing:border-box;}
  body{
    margin:0; color:var(--txt);
    background: linear-gradient(135deg, var(--violet), var(--violet-2));
    font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,Arial,sans-serif;
  }

  /* HEADER */
  .cofel-header{
    position:sticky; top:0; z-index:1000; padding:8px 14px;
    background: linear-gradient(180deg, rgba(255,255,255,.16), rgba(255,255,255,.06));
    border-bottom:1px solid rgba(255,255,255,.2);
    backdrop-filter: blur(var(--blur));
  }
  .cofel-header .row{
    display:flex; align-items:center; gap:12px; max-width:1200px; margin:auto;
  }
  .cofel-back{
    color:white; text-decoration:none;
    padding:8px 14px; border-radius:12px;
    border:1px solid rgba(255,255,255,.35);
  }
  .cofel-brand img{height:36px; border-radius:8px;}

  /* CONTAINER */
  .wrapper{ max-width:1100px; margin:0 auto; padding:20px; }
  h1{text-align:center; margin-bottom:10px;}

  /* STEPS NAV */
  .steps-nav{
    display:flex; justify-content:center; gap:10px;
    flex-wrap:wrap; padding:10px 0; margin-bottom:20px;
  }
  .step-item{
    padding:6px 12px; border-radius:12px;
    border:1px solid rgba(255,255,255,.25);
    background:rgba(255,255,255,.08);
    font-size:14px; cursor:pointer;
    opacity:.45; transition:.15s;
  }
  .step-item.active{
    opacity:1; border-color:white; font-weight:700; text-decoration:underline;
  }
  .step-item.locked{
    cursor:not-allowed; opacity:.2;
  }

  /* SECTIONS */
  .step-section{ display:none; }
  .step-section.active{ display:block; }

  fieldset{
    border:1px solid rgba(255,255,255,.2);
    border-radius:20px; padding:16px; margin:18px 0;
    background: linear-gradient(180deg, rgba(255,255,255,.18), rgba(255,255,255,.06));
    backdrop-filter: blur(var(--blur));
    box-shadow:var(--shadow);
  }
  legend{ padding:0 10px; font-weight:800; }

  .radio-row{
    display:flex; flex-wrap:wrap; gap:10px; margin-top:10px;
  }
  .radio-row label{
    display:flex; align-items:center; gap:8px;
    padding:10px 14px; border-radius:14px;
    background: rgba(255,255,255,.10);
    border:1px solid rgba(255,255,255,.24);
    cursor:pointer; font-weight:700;
  }

  .hint{ font-size:13px; opacity:.85; margin-top:8px; }

  .nav-buttons{
    margin-top:20px; text-align:center;
    display:flex; justify-content:center; gap:20px;
  }
  .btn-nav{
    padding:10px 18px; font-weight:700; border-radius:12px;
    border:none; cursor:pointer;
    background:white; color:#222;
    box-shadow:0 6px 18px rgba(0,0,0,.25);
  }
</style>
