:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5b636e;
  --border: #e2e0d8;
  --accent: #1d5fa8;
  --accent-soft: #e6eef8;
  --bizu: #0f7a4a;
  --bizu-bg: #e7f5ee;
  --pega: #b3261e;
  --pega-bg: #fbeceb;
  --mnem: #7a4bb5;
  --mnem-bg: #f1ebfa;
  --lei: #8a6100;
  --lei-bg: #fbf3df;
  --code-bg: #f0efea;
  --sidebar-w: 270px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15171a; --surface: #1d2024; --text: #e6e6e3; --muted: #9aa1aa; --border: #30343a;
    --accent: #6ea8ec; --accent-soft: #1f2d3f;
    --bizu: #5fd39b; --bizu-bg: #17291f; --pega: #f08a82; --pega-bg: #33191a;
    --mnem: #c3a2f0; --mnem-bg: #251d33; --lei: #e5c06a; --lei-bg: #2e2716; --code-bg: #26292e;
  }
}
:root[data-theme="dark"] {
  --bg: #15171a; --surface: #1d2024; --text: #e6e6e3; --muted: #9aa1aa; --border: #30343a;
  --accent: #6ea8ec; --accent-soft: #1f2d3f;
  --bizu: #5fd39b; --bizu-bg: #17291f; --pega: #f08a82; --pega-bg: #33191a;
  --mnem: #c3a2f0; --mnem-bg: #251d33; --lei: #e5c06a; --lei-bg: #2e2716; --code-bg: #26292e;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 16px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}
a { color: var(--accent); }

/* Layout */
.layout { display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 100vh; }
.layout > div { min-width: 0; }
.sidebar {
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  background: var(--surface); border-right: 1px solid var(--border); padding: 18px 14px;
}
.sidebar .brand { font-weight: 700; font-size: 15px; margin: 0 6px 4px; }
.sidebar .brand a { color: var(--text); text-decoration: none; }
.sidebar .sub { color: var(--muted); font-size: 12px; margin: 0 6px 12px; }
.sidebar input[type=search] {
  width: 100%; padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text); font: inherit; font-size: 14px; margin-bottom: 10px;
}
.sidebar .grp { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 14px 6px 4px; }
.sidebar nav a {
  display: flex; justify-content: space-between; gap: 6px; padding: 5px 8px; border-radius: 7px;
  color: var(--text); text-decoration: none; font-size: 14px;
}
.sidebar nav a:hover { background: var(--accent-soft); }
.sidebar nav a.active { background: var(--accent); color: #fff; }
.sidebar nav a .w { font-size: 11px; color: var(--muted); white-space: nowrap; }
.sidebar nav a.active .w { color: #dfe9f7; }
.sidebar .toc { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 8px; }
.sidebar .toc a { display: block; font-size: 13px; color: var(--muted); padding: 3px 8px; text-decoration: none; border-radius: 6px; }
.sidebar .toc a:hover { color: var(--accent); }
.sidebar .tools { margin-top: 14px; display: flex; gap: 6px; }
.sidebar .tools button {
  flex: 1; font: inherit; font-size: 12px; padding: 6px; border-radius: 7px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.menu-btn { display: none; }

main { padding: 32px 40px 80px; max-width: 980px; width: 100%; }
main h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; }
main .meta { color: var(--muted); margin-bottom: 22px; font-size: 14px; }
main .meta b { color: var(--text); }
main h2 { font-size: 22px; margin: 38px 0 10px; padding-bottom: 6px; border-bottom: 2px solid var(--border); }
main h3 { font-size: 18px; margin: 24px 0 8px; }
main p, main li { max-width: 78ch; }
main ul, main ol { padding-left: 22px; }
code, kbd { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-family: Consolas, "Cascadia Mono", monospace; font-size: .92em; }
pre { background: var(--code-bg); padding: 12px 14px; border-radius: 8px; overflow-x: auto; font-size: 14px; line-height: 1.5; }
pre code { background: none; padding: 0; }
mark { background: #ffe58a; color: #1f2328; padding: 0 2px; border-radius: 3px; }

/* Tables */
.tbl { overflow-x: auto; margin: 12px 0 18px; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; background: var(--surface); }
th, td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; vertical-align: top; }
th { background: var(--accent-soft); }

/* Callouts */
.box { border-left: 4px solid; border-radius: 8px; padding: 10px 14px; margin: 14px 0; }
.box > :first-child { margin-top: 0; }
.box > :last-child { margin-bottom: 0; }
.box .t { font-weight: 700; display: block; margin-bottom: 4px; }
.box.bizu { border-color: var(--bizu); background: var(--bizu-bg); }
.box.bizu .t { color: var(--bizu); }
.box.pegadinha { border-color: var(--pega); background: var(--pega-bg); }
.box.pegadinha .t { color: var(--pega); }
.box.mnemonico { border-color: var(--mnem); background: var(--mnem-bg); }
.box.mnemonico .t { color: var(--mnem); }
.box.lei { border-color: var(--lei); background: var(--lei-bg); }
.box.lei .t { color: var(--lei); }
.box.bizu .t::before { content: "💡 "; }
.box.pegadinha .t::before { content: "⚠️ "; }
.box.mnemonico .t::before { content: "🧠 "; }
.box.lei .t::before { content: "📜 "; }

/* Cards (index) */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin: 14px 0; }
.card {
  display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px; text-decoration: none; color: var(--text);
}
.card:hover { border-color: var(--accent); }
.card b { display: block; }
.card span { color: var(--muted); font-size: 13px; }
.tag { display: inline-block; font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); margin-right: 4px; }

/* Quiz */
.leitura-links { display: flex; flex-wrap: wrap; gap: 8px; margin: -8px 0 20px; }
.leitura-links a { padding: 7px 12px; border: 1px solid var(--border); border-radius: 7px; text-decoration: none; font-size: 14px; background: var(--surface); }
.leitura-links a:first-child { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.leitura-links button { padding: 7px 12px; border: 1px solid var(--border); border-radius: 7px; color: var(--text); background: var(--surface); font: inherit; font-size: 14px; cursor: pointer; }
.comentario-professor { border-left: 3px solid var(--lei); background: var(--lei-bg); padding: 12px 16px; margin: 14px 0 20px; border-radius: 0 7px 7px 0; font-size: 15px; }
.professor-titulo { display: block; color: var(--lei); font-size: 12px; text-transform: uppercase; letter-spacing: .045em; }
.comentario-professor p { margin: 7px 0 0; }
.detalhe-professor { border-left-width: 2px; background: var(--surface); padding: 8px 14px; font-size: 14px; }
.orientacao-professor { padding: 20px; margin: 26px 0; border: 1px solid var(--accent); border-radius: 8px; background: var(--accent-soft); }
.orientacao-professor > strong { font-size: 19px; color: var(--accent); }
.orientacao-professor p { margin: 8px 0; }
.professor-ressalva, .fontes-professor { font-size: 13px; color: var(--muted); }
.fontes-professor { margin: 36px 0 0; border-top: 1px solid var(--border); padding-top: 16px; }
.sem-comentarios .comentario-professor { display: none; }
.leitura-links button:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.fundamentos { margin: 28px 0 40px; padding: 6px 22px 16px; border: 1px solid var(--border); border-top: 4px solid var(--accent); border-radius: 8px; background: var(--surface); }
.fundamentos h2 { margin-top: 20px; border-bottom: 0; color: var(--accent); }
.fundamentos h3 { font-size: 18px; }
.fundamentos .roteiro { color: var(--muted); }
.box.exemplo { border-color: var(--accent); background: var(--accent-soft); }
.box.exemplo .t { color: var(--accent); }
.checagem { margin: 20px 0 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; }
.checagem summary { cursor: pointer; font-weight: 600; }
.checagem p { margin-bottom: 0; }
.proximo-passo { font-size: 14px; color: var(--muted); padding-top: 12px; border-top: 1px solid var(--border); }
.leitura-links a:focus-visible, .checagem summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }

.quiz { margin: 10px 0; }
.quiz details { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; margin: 8px 0; }
.quiz summary { cursor: pointer; font-weight: 600; }
.quiz details[open] summary { margin-bottom: 6px; }
.quiz .r { color: var(--bizu); font-weight: 700; }

/* Prev/next */
.pn { display: flex; justify-content: space-between; gap: 12px; margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); }
.pn a { text-decoration: none; font-weight: 600; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 10; left: 0; top: 0; width: 85vw; max-width: 320px; transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: none; box-shadow: 0 0 30px rgba(0,0,0,.3); }
  .menu-btn {
    display: inline-block; position: sticky; top: 8px; z-index: 5; margin: 8px 16px 0;
    font: inherit; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--border);
    background: var(--surface); color: var(--text);
  }
  main { padding: 16px 16px 60px; }
  .fundamentos { padding: 4px 14px 12px; }
  main h1 { font-size: 24px; }
}
@media print {
  .sidebar, .menu-btn, .pn, .leitura-links { display: none; }
  .layout { display: block; }
  main { max-width: none; padding: 0; }
  .quiz details { break-inside: avoid; }
  .quiz details:not([open]) > *:not(summary) { display: block; }
  .checagem { break-inside: avoid; }
  .checagem:not([open]) > *:not(summary) { display: block; }
  .sem-comentarios .comentario-professor { display: block; }
  .comentario-professor { break-inside: avoid; }
}