/* Math Worksheet Generator — calm, premium edtech look.
   Restraint over decoration: whitespace + soft shadows instead of borders and
   rules. One accent color. Zero deps. Distinct from sibling tools. */
:root{
  --ink:#1b2532; --muted:#697586; --faint:#9aa4b2;
  --bg:#f5f7fa; --card:#ffffff; --hair:#eceff3;
  --brand:#2e5a87; --brand-ink:#21456b; --accent:#eef3f9; --ok:#1c7c54;
  --shadow-sm:0 1px 2px rgba(16,24,40,.04),0 1px 3px rgba(16,24,40,.05);
  --shadow:0 6px 24px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.04);
  --maxw:940px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16.5px/1.62 "Inter","Segoe UI",system-ui,-apple-system,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
a{color:var(--brand-ink);text-underline-offset:2px}
h1,h2,h3{font-family:Georgia,"Iowan Old Style","Times New Roman",serif;font-weight:600;color:var(--ink)}
h1{font-size:2.15rem;line-height:1.16;letter-spacing:-.015em;margin:.1em 0 .25em}
h2{font-size:1.42rem;letter-spacing:-.01em;margin:1.9em 0 .45em}
h3{font-size:1.1rem;margin:1.3em 0 .3em}
.lede{font-size:1.12rem;line-height:1.55;color:#46505f;margin:.2em 0 1.4em;max-width:62ch}
.muted{color:var(--muted)}
p{margin:.55em 0}
section{margin:2em 0}
ul{padding-left:1.15em}
li{margin:.35em 0}

/* header / footer — hairline only, lots of air */
.site-head{background:rgba(255,255,255,.85);backdrop-filter:saturate(1.4) blur(8px);
  border-bottom:1px solid var(--hair);position:sticky;top:0;z-index:5}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 22px;flex-wrap:wrap}
.brand{font-family:Georgia,"Times New Roman",serif;font-weight:600;color:var(--ink);
  text-decoration:none;font-size:1.16rem;letter-spacing:-.01em}
.nav a{margin-left:20px;text-decoration:none;color:var(--muted);font-size:.94rem;font-weight:500}
.nav a:hover{color:var(--brand-ink)}
.site-foot{margin-top:3.2em;border-top:1px solid var(--hair)}
.site-foot .wrap{display:flex;justify-content:space-between;gap:12px;padding:22px;flex-wrap:wrap;color:var(--faint);font-size:.9rem}
.site-foot a{color:var(--muted);text-decoration:none}
.site-foot a:hover{color:var(--brand-ink)}

/* tool — soft card, no borders */
.tool{background:var(--card);border-radius:10px;box-shadow:var(--shadow);padding:26px;margin:18px 0 8px}
.controls{display:flex;flex-wrap:wrap;gap:18px 26px;align-items:flex-end}
.field{display:flex;flex-direction:column;gap:6px;font-size:.9rem}
.field label{color:var(--muted);font-weight:600;letter-spacing:.01em}
.field select,.field input[type=number],.field input[type=text]{
  font:inherit;font-size:.97rem;padding:9px 11px;border:1px solid var(--hair);border-radius:8px;
  background:#fff;min-height:42px;color:var(--ink);transition:border-color .15s,box-shadow .15s}
.field select:focus,.field input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--accent)}
.ops{display:flex;gap:10px;flex-wrap:wrap}
.ops label{display:inline-flex;align-items:center;gap:8px;font-weight:600;color:var(--ink);
  border:1px solid var(--hair);border-radius:8px;padding:9px 14px;cursor:pointer;background:#fff;
  transition:border-color .15s,background .15s,color .15s}
.ops label:hover{border-color:#cfd6e0}
.ops label:has(input:checked){border-color:var(--brand);background:var(--accent);color:var(--brand-ink)}
.ops input{width:16px;height:16px;accent-color:var(--brand)}
.btnrow{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:18px}
.btn{font:inherit;font-weight:600;font-size:.97rem;border:1px solid var(--hair);background:#fff;color:var(--ink);
  border-radius:8px;padding:10px 18px;cursor:pointer;min-height:44px;transition:background .15s,border-color .15s,box-shadow .15s}
.btn:hover{border-color:#cfd6e0;background:#fbfcfe}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 1px 2px rgba(46,90,135,.25)}
.btn-primary:hover{background:var(--brand-ink);border-color:var(--brand-ink)}
.toggle{display:inline-flex;align-items:center;gap:8px;font-weight:500;color:var(--ink);cursor:pointer;font-size:.95rem}
.toggle input{width:17px;height:17px;accent-color:var(--brand)}
.status{color:var(--ok);font-size:.9rem;margin-left:2px}

/* the worksheet itself — clean paper, minimal rules */
.ws-sheet-host{background:#fff;border-radius:8px;box-shadow:var(--shadow-sm);padding:30px 30px 34px;margin-top:18px;min-height:130px}
.ws-sheet-title h2{margin:0 0 6px;font-size:1.3rem}
.ws-sheet-meta{display:flex;gap:26px;flex-wrap:wrap;color:var(--muted);font-size:.92rem;margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--hair)}
.ws-grid{display:grid;gap:14px 22px}
.ws-prob{display:flex;align-items:baseline;gap:6px;font-size:1rem;white-space:nowrap;min-width:0}
.ws-num{color:var(--faint);font-size:.78rem;min-width:1.7em;flex:0 0 auto}
.ws-expr{font-variant-numeric:tabular-nums;flex:0 0 auto}
.ws-blank{flex:1 1 auto;min-width:1.2em;border-bottom:1.5px solid #c4ccd8}
.ws-ans{flex:0 0 auto;font-weight:700;color:var(--brand)}
.ws-answer-key{margin-top:30px;padding-top:18px;border-top:1px solid var(--hair)}
.ws-answer-key h3{margin:0 0 .7em;color:var(--muted);font-size:.95rem;font-family:inherit;font-weight:700;
  text-transform:uppercase;letter-spacing:.06em}
.ws-answer-key .ws-prob{font-size:.98rem}

/* content */
.note{background:var(--accent);border-radius:8px;padding:16px 18px;color:#33414f}
.cards{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.cards li{border-radius:8px;padding:16px;background:#fff;box-shadow:var(--shadow-sm);transition:box-shadow .15s,transform .15s}
.cards li:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.cards a{font-weight:600;text-decoration:none;color:var(--brand-ink)}
.cards .muted{font-size:.9rem;margin-top:.3em}
.example{overflow-x:auto}
.example table{border-collapse:collapse;width:100%;font-size:.97rem}
.example th{text-align:left;color:var(--muted);font-weight:600;font-size:.82rem;text-transform:uppercase;
  letter-spacing:.05em;padding:8px 12px;border-bottom:1px solid var(--hair)}
.example td{padding:9px 12px;border-bottom:1px solid var(--hair)}
.example tbody tr:last-child td{border-bottom:none}
.faq dt{font-weight:600;margin-top:1em;color:var(--ink)}
.faq dd{margin:.25em 0 .25em;color:#46505f}

.print-footer{display:none}

/* ---- PRINT: only the worksheet ---- */
@media print{
  @page{margin:14mm}
  .no-print,.site-head,.site-foot,.controls,.btnrow,.status,
  main section,.note,.cards,h1,.lede,.tool>.muted,.ws-noscript{display:none !important}
  body{font-size:12pt;color:#000;background:#fff}
  .wrap{max-width:none;padding:0}
  .tool{box-shadow:none;padding:0;margin:0;border-radius:0}
  .ws-sheet-host{box-shadow:none;border-radius:0;padding:0}
  .ws-grid{gap:11px 16px}
  .ws-prob{font-size:10.5pt;gap:5px;page-break-inside:avoid}
  .ws-num{min-width:1.5em}
  .ws-blank{border-bottom:1.5px solid #000;min-width:1.1em}
  .ws-answer-key{page-break-before:always;border-top:none}
  .ws-answer-key .ws-prob{font-size:10pt}
  .print-footer{display:block !important;margin-top:16pt;padding-top:7pt;border-top:1px solid #bbb;
    font-size:9pt;color:#555;text-align:right}
}