:root{
  --sans:system-ui,-apple-system,Segoe UI,Roboto,Arial,"Noto Sans","Helvetica Neue",sans-serif;
  --serif:ui-serif,Georgia,"Times New Roman",Times,serif;
  --ink:#0b1b2b;
  --muted:#5b6670;
  --line:rgba(0,0,0,.14);
  --card:rgba(0,0,0,.02);
  --radius:16px
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:var(--sans);color:#111;background:#fff}
a{color:inherit;text-decoration:none}
main{max-width:980px;margin:0 auto;padding:28px 18px 40px}
h1{font-size:34px;margin:6px 0 10px;color:var(--ink);font-family:var(--serif)}
h2{font-size:24px;margin:18px 0 8px;color:var(--ink);font-family:var(--serif)}
h3{font-size:18px;margin:14px 0 6px;color:var(--ink)}
p{line-height:1.78;margin:10px 0}
ul,ol{line-height:1.78}
.topbar{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--line);z-index:50}
.topbar .inner{max-width:1200px;margin:0 auto;padding:12px 14px;display:flex;gap:12px;align-items:center;justify-content:space-between}
.brand .title{font-weight:700;font-size:14px;color:var(--ink)}
.brand .sub{font-size:12px;color:var(--muted);margin-top:2px}
.navbtns{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.btn,button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 12px;font-family:var(--sans);font-size:12.5px;cursor:pointer}
button:hover,.btn:hover{background:rgba(0,0,0,.03)}
.box,.nota,.questoes,.laboratorio,.resumo{border:1px solid var(--line);border-radius:var(--radius);padding:14px;margin:16px 0;background:var(--card)}
.boxtitle{font-weight:700;margin-bottom:8px;color:var(--ink)}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
table{width:100%;border-collapse:collapse;margin:14px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
th,td{padding:10px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:rgba(0,0,0,.03);text-align:left}
.muted{color:var(--muted)}
.pagebreak{break-before:page;page-break-before:always}
.coverwrap{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:85vh}
.coverwrap img{max-width:520px;width:92%;height:auto;border:1px solid var(--line);border-radius:18px;box-shadow:0 10px 30px rgba(0,0,0,.08)}
@page{size:A4 portrait;margin:22mm 18mm}
@media print{
  .noprint{display:none!important}
  body{font-family:var(--serif)!important;font-size:14.2pt;line-height:1.92}
  main{max-width:none!important;padding:0!important}
  h1{break-before:page;page-break-before:always;margin-top:0}
  .coverwrap{min-height:0}
  .coverwrap img{box-shadow:none}
}