/* ---------- Design tokens ---------- */
  :root{
    --red:#C8102E;          /* Red Cross primary — used with restraint */
    --red-deep:#9E0C24;
    --ink:#1B2530;          /* primary text */
    --ink-soft:#54626F;     /* secondary text */
    --line:#D9E0E7;         /* hairlines */
    --bg:#E9EDF1;           /* cool, clinical page background */
    --surface:#FFFFFF;      /* cards */
    --surface-2:#F3F6F9;    /* insets */
    --good:#1E8E5A;         /* correct */
    --good-bg:#E4F4EC;
    --warn:#C99A2E;
    --bad:#C8102E;          /* incorrect */
    --bad-bg:#FBE9EC;
    --r:16px;               /* card radius */
    --font-display:"Fraunces",Georgia,"Times New Roman",serif;
    --font-body:"Hanken Grotesk",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
    --font-mono:"Space Mono",ui-monospace,Menlo,Consolas,monospace;
  }

  *{box-sizing:border-box;}
  html,body{margin:0;}
  body{
    font-family:var(--font-body);
    color:var(--ink);
    background:
      radial-gradient(120% 90% at 50% -10%, #F4F7FA 0%, var(--bg) 55%) fixed;
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
    padding:max(16px, env(safe-area-inset-top)) 16px max(28px, env(safe-area-inset-bottom));
  }
  .wrap{max-width:680px;margin:0 auto;position:relative;}

  /* ---------- Masthead ---------- */
  .masthead{padding:14px 2px 22px;position:relative;}
  .top-nav{
    position:absolute;top:14px;right:2px;
    display:flex;align-items:center;gap:10px;
    z-index:50;
  }
  .back-portal-link{
    display:flex;align-items:center;justify-content:center;
    width:32px;height:32px;background:#0c0b09;
    border:1px solid #252220;border-radius:6px;
    color:#c8922a;text-decoration:none;
    font-family:"Cormorant Garamond",Georgia,serif;font-size:20px;font-weight:600;
    transition:all .2s;cursor:pointer;
  }
  .back-portal-link:hover{
    border-color:#c8922a;
    background:#131110;
    box-shadow:0 0 10px rgba(200,146,42,.25);
    color:#c8922a;
  }
  .acct-link{
    font-size:13px;font-family:inherit;
    padding:6px 12px;border-radius:8px;text-decoration:none;
    background:var(--surface,#fff);color:var(--ink);
    border:1px solid var(--line,rgba(0,0,0,.15));
    transition:all .2s;
  }
  .acct-link:hover{
    border-color:#B9C4CE;
    background:var(--surface-2);
  }
  .brandmark{display:flex;align-items:center;gap:12px;}
  .cross{
    width:34px;height:34px;flex:0 0 auto;
    display:grid;place-items:center;
    background:var(--red);border-radius:9px;
    box-shadow:0 4px 14px rgba(200,16,46,.28);
  }
  .cross svg{width:20px;height:20px;display:block;}
  .eyebrow{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
    text-transform:uppercase;color:var(--red-deep);margin:0;
  }
  h1{
    font-family:var(--font-display);font-weight:600;
    font-size:clamp(28px,7vw,40px);line-height:1.04;
    letter-spacing:-.015em;margin:.28em 0 .15em;
  }
  .lede{color:var(--ink-soft);font-size:15px;max-width:46ch;margin:0;}
  .ccc{
    font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
    text-transform:uppercase;color:var(--ink-soft);margin-top:14px;
    display:flex;gap:10px;align-items:center;flex-wrap:wrap;
  }
  .ccc b{color:var(--ink);font-weight:700;}
  .ccc .dot{width:4px;height:4px;border-radius:50%;background:var(--red);}

  /* ---------- Cards ---------- */
  .card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:var(--r);padding:20px;
    box-shadow:0 1px 0 rgba(27,37,48,.02), 0 18px 40px -28px rgba(27,37,48,.35);
  }
  .section-label{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
    text-transform:uppercase;color:var(--ink-soft);margin:0 0 12px;
  }

  /* ---------- Start screen ---------- */
  .pick-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;}
  .count-pill{
    font-family:var(--font-mono);font-size:11px;color:var(--ink-soft);
    background:var(--surface-2);border:1px solid var(--line);
    padding:3px 9px;border-radius:999px;white-space:nowrap;
  }
  .topics{display:flex;flex-wrap:wrap;gap:8px;margin:4px 0 4px;}
  .chip{
    appearance:none;cursor:pointer;font-family:var(--font-body);
    font-size:13.5px;font-weight:500;color:var(--ink);
    background:var(--surface);border:1px solid var(--line);
    padding:8px 12px 8px 10px;border-radius:999px;
    display:inline-flex;align-items:center;gap:8px;line-height:1;
    transition:border-color .15s, background .15s, transform .05s;
  }
  .chip .sw{width:10px;height:10px;border-radius:3px;flex:0 0 auto;}
  .chip[aria-pressed="true"]{
    border-color:currentColor;background:var(--surface-2);
    box-shadow:inset 0 0 0 1px currentColor;
  }
  .chip:active{transform:translateY(1px);}
  .chip.all{font-weight:700;}
  .chip.all .sw{background:var(--red);}

  .field{margin-top:20px;}
  .field > .lab{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
    text-transform:uppercase;color:var(--ink-soft);display:block;margin-bottom:8px;
  }
  .seg{display:inline-flex;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface);}
  .seg button{
    appearance:none;cursor:pointer;border:0;background:transparent;
    font-family:var(--font-body);font-size:14px;font-weight:600;color:var(--ink-soft);
    padding:10px 16px;line-height:1;transition:color .15s, background .15s;
    border-right:1px solid var(--line);
  }
  .seg button:last-child{border-right:0;}
  .seg button[aria-pressed="true"]{background:var(--ink);color:#fff;}

  /* Infants-only toggle (start screen) */
  .infant-toggle{
    appearance:none;cursor:pointer;font-family:var(--font-body);
    font-size:14px;font-weight:600;color:var(--ink-soft);
    background:var(--surface);border:1px solid var(--line);
    padding:9px 14px;border-radius:999px;
    display:inline-flex;align-items:center;gap:10px;line-height:1;
    transition:border-color .15s, background .15s, color .15s, transform .05s;
  }
  .infant-toggle .ind{
    width:30px;height:16px;border-radius:999px;background:var(--line);
    position:relative;flex:0 0 auto;transition:background .15s;
  }
  .infant-toggle .ind::after{
    content:"";position:absolute;top:2px;left:2px;width:12px;height:12px;
    border-radius:50%;background:#fff;transition:transform .15s;
  }
  .infant-toggle[aria-pressed="true"]{
    color:var(--red-deep);border-color:var(--red);background:var(--surface-2);
  }
  .infant-toggle[aria-pressed="true"] .ind{background:var(--red);}
  .infant-toggle[aria-pressed="true"] .ind::after{transform:translateX(14px);}
  .infant-toggle:active{transform:translateY(1px);}
  .infant-hint{display:block;margin-top:8px;font-size:12px;color:var(--ink-soft);}

  .start-btn{
    appearance:none;cursor:pointer;width:100%;margin-top:22px;
    font-family:var(--font-body);font-size:16px;font-weight:700;color:#fff;
    background:var(--red);border:0;border-radius:13px;padding:16px;
    display:flex;align-items:center;justify-content:center;gap:10px;
    box-shadow:0 10px 24px -10px rgba(200,16,46,.6);
    transition:transform .06s, box-shadow .15s, background .15s;
  }
  .start-btn:hover{background:var(--red-deep);}
  .start-btn:active{transform:translateY(1px);}
  .start-btn[disabled]{opacity:.5;cursor:not-allowed;box-shadow:none;}
  .start-btn[disabled]:hover{background:var(--red);}
  .start-btn .pulse{
    width:9px;height:9px;border-radius:50%;background:#fff;opacity:.9;
    animation:pulse 1.8s ease-in-out infinite;
  }
  @keyframes pulse{0%,100%{transform:scale(1);opacity:.55;}50%{transform:scale(1.5);opacity:1;}}

  .disclaimer{
    margin-top:16px;font-size:12.5px;color:var(--ink-soft);
    display:flex;gap:9px;align-items:flex-start;
  }
  .disclaimer .b{color:var(--red-deep);font-weight:700;}

  /* ---------- Quiz screen ---------- */
  .topline{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px;}
  .qcount{font-family:var(--font-mono);font-size:12px;color:var(--ink-soft);letter-spacing:.04em;}
  .quit{
    appearance:none;border:0;background:none;cursor:pointer;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
    color:var(--ink-soft);padding:4px;border-bottom:1px solid transparent;
  }
  .quit:hover{color:var(--ink);border-bottom-color:var(--line);}
  .bar{height:5px;border-radius:999px;background:var(--surface-2);overflow:hidden;border:1px solid var(--line);}
  .bar > i{display:block;height:100%;width:0;background:var(--red);transition:width .35s cubic-bezier(.2,.7,.2,1);border-radius:999px;}

  .qcard{margin-top:16px;position:relative;overflow:hidden;padding-left:22px;}
  .qcard .spine{position:absolute;left:0;top:0;bottom:0;width:7px;background:var(--red);}
  .topic-chip{
    display:inline-flex;align-items:center;gap:7px;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
    color:var(--ink);background:var(--surface-2);border:1px solid var(--line);
    padding:5px 10px;border-radius:999px;margin-bottom:14px;
  }
  .topic-chip .sw{width:9px;height:9px;border-radius:3px;}
  .question{
    font-family:var(--font-display);font-weight:500;
    font-size:clamp(20px,4.6vw,25px);line-height:1.22;letter-spacing:-.01em;
    margin:0 0 18px;outline:none;
  }
  .opts{display:flex;flex-direction:column;gap:10px;}
  .opt{
    appearance:none;cursor:pointer;text-align:left;width:100%;
    font-family:var(--font-body);font-size:15.5px;color:var(--ink);
    background:var(--surface);border:1.5px solid var(--line);border-radius:12px;
    padding:14px 14px 14px 12px;min-height:54px;
    display:flex;align-items:center;gap:12px;line-height:1.35;
    transition:border-color .12s, background .12s, transform .05s;
  }
  .opt:hover:not(:disabled){border-color:#B9C4CE;background:var(--surface-2);}
  .opt:active:not(:disabled){transform:translateY(1px);}
  .opt .idx{
    flex:0 0 auto;width:24px;height:24px;border-radius:7px;
    display:grid;place-items:center;font-family:var(--font-mono);font-size:12px;
    color:var(--ink-soft);background:var(--surface-2);border:1px solid var(--line);
  }
  .opt:disabled{cursor:default;}
  .opt.correct{border-color:var(--good);background:var(--good-bg);}
  .opt.correct .idx{background:var(--good);color:#fff;border-color:var(--good);}
  .opt.wrong{border-color:var(--bad);background:var(--bad-bg);}
  .opt.wrong .idx{background:var(--bad);color:#fff;border-color:var(--bad);}
  .opt .mk{margin-left:auto;font-weight:700;font-size:14px;}
  .opt.correct .mk{color:var(--good);}
  .opt.wrong .mk{color:var(--bad);}

  .explain{
    margin-top:16px;border-radius:12px;padding:14px 16px;display:none;
    border:1px solid var(--line);background:var(--surface-2);
    animation:rise .25s ease both;
  }
  .explain .verdict{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
    font-weight:700;margin:0 0 6px;
  }
  .explain.ok .verdict{color:var(--good);}
  .explain.no .verdict{color:var(--bad);}
  .explain p{margin:0;font-size:14.5px;color:var(--ink);}
  @keyframes rise{from{opacity:0;transform:translateY(6px);}to{opacity:1;transform:none;}}

  .nextrow{margin-top:16px;display:none;}
  .next-btn{
    appearance:none;cursor:pointer;width:100%;
    font-family:var(--font-body);font-size:15px;font-weight:700;color:#fff;
    background:var(--ink);border:0;border-radius:12px;padding:15px;
    display:flex;align-items:center;justify-content:center;gap:8px;
    transition:transform .06s, opacity .15s;
  }
  .next-btn:active{transform:translateY(1px);}

  /* ---------- Results screen ---------- */
  .res-top{display:flex;align-items:center;gap:20px;flex-wrap:wrap;}
  .ring{
    --p:0; --c:var(--red);
    width:120px;height:120px;border-radius:50%;flex:0 0 auto;
    background:
      conic-gradient(var(--c) calc(var(--p)*1%), var(--surface-2) 0);
    display:grid;place-items:center;position:relative;
  }
  .ring::after{content:"";position:absolute;inset:11px;border-radius:50%;background:var(--surface);border:1px solid var(--line);}
  .ring .inner{position:relative;text-align:center;line-height:1;}
  .ring .pct{font-family:var(--font-display);font-weight:600;font-size:30px;}
  .ring .frac{font-family:var(--font-mono);font-size:11px;color:var(--ink-soft);margin-top:3px;}
  .res-msg{flex:1 1 200px;min-width:180px;}
  .res-msg h2{font-family:var(--font-display);font-weight:600;font-size:24px;margin:0 0 4px;letter-spacing:-.01em;}
  .res-msg p{margin:0;color:var(--ink-soft);font-size:14.5px;}

  .breakdown{margin-top:22px;border-top:1px solid var(--line);padding-top:18px;}
  .brk-row{display:flex;align-items:center;gap:10px;padding:7px 0;}
  .brk-row .sw{width:10px;height:10px;border-radius:3px;flex:0 0 auto;}
  .brk-row .name{font-size:14px;flex:1 1 auto;}
  .brk-row .mini{height:5px;border-radius:999px;background:var(--surface-2);width:74px;overflow:hidden;border:1px solid var(--line);flex:0 0 auto;}
  .brk-row .mini > i{display:block;height:100%;}
  .brk-row .sc{font-family:var(--font-mono);font-size:12px;color:var(--ink-soft);width:38px;text-align:right;flex:0 0 auto;}

  .res-actions{margin-top:22px;display:flex;flex-direction:column;gap:10px;}
  .btn-primary,.btn-ghost,.btn-line{
    appearance:none;cursor:pointer;font-family:var(--font-body);font-weight:700;font-size:15px;
    border-radius:12px;padding:14px;display:flex;align-items:center;justify-content:center;gap:8px;
    transition:transform .06s, background .15s, border-color .15s;
  }
  .btn-primary{color:#fff;background:var(--red);border:0;box-shadow:0 10px 22px -12px rgba(200,16,46,.6);}
  .btn-primary:hover{background:var(--red-deep);}
  .btn-line{background:var(--surface);color:var(--ink);border:1.5px solid var(--line);}
  .btn-line:hover{border-color:#B9C4CE;background:var(--surface-2);}
  .btn-ghost{background:none;border:0;color:var(--ink-soft);font-weight:600;font-size:13.5px;}
  .btn-ghost:hover{color:var(--ink);}
  .btn-primary:active,.btn-line:active{transform:translateY(1px);}

  .review{margin-top:8px;display:none;border-top:1px solid var(--line);padding-top:16px;}
  .rv{padding:13px 0;border-bottom:1px solid var(--line);}
  .rv:last-child{border-bottom:0;}
  .rv .qq{font-weight:600;font-size:14.5px;margin:0 0 8px;}
  .rv .ln{font-size:13.5px;margin:3px 0;display:flex;gap:8px;}
  .rv .ln .tag{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;flex:0 0 auto;width:64px;color:var(--ink-soft);padding-top:2px;}
  .rv .ln.right .val{color:var(--good);font-weight:600;}
  .rv .ln.your .val{color:var(--bad);font-weight:600;}
  .rv .ln.your.ok .val{color:var(--good);}   /* chosen answer that was correct */
  .rv .ln .val{color:var(--ink);}
  .rv .why{font-size:13px;color:var(--ink-soft);margin:7px 0 0;}

  /* ---------- Footer ---------- */
  footer{margin:22px 2px 4px;font-size:12px;color:var(--ink-soft);line-height:1.5;}
  footer b{color:var(--ink);}

  /* ---------- Saved results & history ---------- */
  .saved-note{
    font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;
    color:var(--ink-soft);margin:0 0 14px;
  }
  .signin-nudge{
    font-size:13px;line-height:1.5;margin:0 0 14px;padding:10px 13px;
    border:1px solid var(--line);border-left:3px solid var(--warn);border-radius:10px;
    background:var(--surface-2);color:var(--ink);
  }
  .signin-nudge a{color:var(--red);font-weight:700;text-decoration:underline;}
  .signin-nudge a:hover{color:var(--red-deep);}
  .history-link{
    appearance:none;cursor:pointer;width:100%;margin-top:14px;
    font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
    color:var(--ink-soft);background:var(--surface-2);border:1px solid var(--line);
    border-radius:10px;padding:11px;transition:border-color .15s, color .15s;
  }
  .history-link:hover{border-color:#B9C4CE;color:var(--ink);}
  .hist-row{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    padding:13px 0;border-bottom:1px solid var(--line);
  }
  .hist-row:last-child{border-bottom:0;}
  .hist-main{display:flex;align-items:center;gap:14px;min-width:0;}
  .hist-score{font-family:var(--font-display);font-weight:600;font-size:22px;width:54px;flex:0 0 auto;}
  .hist-meta{min-width:0;}
  .hist-date{font-size:14px;font-weight:600;color:var(--ink);}
  .hist-sub{font-family:var(--font-mono);font-size:11px;color:var(--ink-soft);margin-top:2px;}
  .hist-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto;}
  .hist-review{padding:8px 14px;font-size:13.5px;}
  .hist-del{
    appearance:none;cursor:pointer;width:32px;height:32px;border-radius:8px;
    background:var(--surface);border:1px solid var(--line);color:var(--ink-soft);
    font-size:13px;line-height:1;transition:border-color .15s, color .15s, background .15s;
  }
  .hist-del:hover{border-color:var(--bad);color:var(--bad);background:var(--bad-bg);}
  .empty-note{color:var(--ink-soft);font-size:14px;padding:8px 0 4px;}

  .hidden{display:none !important;}

  /* ---------- A11y / motion ---------- */
  :focus-visible{outline:3px solid #2F6FB3;outline-offset:2px;border-radius:8px;}
  @media (prefers-reduced-motion: reduce){
    *{animation:none !important;transition:none !important;}
  }
  @media (max-width:420px){
    .card{padding:16px;}
    .qcard{padding-left:20px;}
  }
  /* Replaces former inline style attributes (CSP: no 'unsafe-inline' for styles).
     Data-driven values (chip/bar colors, bar widths) are set via the CSSOM in app.js. */
  .pick-head .section-label{margin:0;}
  .chip-name{color:var(--ink);}