/* GenAI Engineer Study: tema claro/escuro por variáveis. Desktop primeiro; tablet sem ajuste; mobile não quebra. */
:root {
  color-scheme: light;
  --bg: #f6f7fb; --surface: #ffffff; --surface-2: #eef0f6; --border: #dfe3ec;
  --text: #1c2130; --muted: #636b80; --accent: #4f46e5; --accent-soft: #e8e7fd; --on-accent: #ffffff;
  --good: #15803d; --good-soft: #dcf5e4; --bad: #b42318; --bad-soft: #fde4e1; --warn: #b45309; --warn-soft: #fdf0d5;
  --mark: #fff2a8; --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 4px 16px rgba(20, 24, 40, .05);
  --b-official: #1d4ed8; --b-academy: #7e22ce; --b-review: #0f766e; --b-diagnostic: #b45309; --b-generated: #4b5563;
  --radius: 12px; --gap: 16px;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1117; --surface: #181b25; --surface-2: #212534; --border: #2b3042;
  --text: #e8eaf2; --muted: #9aa2b8; --accent: #8b87ff; --accent-soft: #26264a; --on-accent: #0f1117;
  --good: #4ade80; --good-soft: #14301f; --bad: #f87171; --bad-soft: #3b1816; --warn: #fbbf24; --warn-soft: #3a2c0c;
  --mark: #5c4d00; --shadow: 0 1px 2px rgba(0, 0, 0, .4);
  --b-official: #60a5fa; --b-academy: #c084fc; --b-review: #2dd4bf; --b-diagnostic: #fbbf24; --b-generated: #9ca3af;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0f1117; --surface: #181b25; --surface-2: #212534; --border: #2b3042;
    --text: #e8eaf2; --muted: #9aa2b8; --accent: #8b87ff; --accent-soft: #26264a; --on-accent: #0f1117;
    --good: #4ade80; --good-soft: #14301f; --bad: #f87171; --bad-soft: #3b1816; --warn: #fbbf24; --warn-soft: #3a2c0c;
    --mark: #5c4d00; --shadow: 0 1px 2px rgba(0, 0, 0, .4);
    --b-official: #60a5fa; --b-academy: #c084fc; --b-review: #2dd4bf; --b-diagnostic: #fbbf24; --b-generated: #9ca3af;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); text-decoration: none; } a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0 0 4px; } h2 { font-size: 1.1rem; margin: 0 0 12px; } h3 { font-size: 1rem; margin: 0 0 6px; }
code { font: .9em ui-monospace, Consolas, monospace; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }
pre { background: var(--surface-2); border-radius: 8px; padding: 12px; overflow-x: auto; margin: 8px 0; }
pre code { background: none; padding: 0; }
.muted { color: var(--muted); } .small { font-size: .85rem; } .right { margin-left: auto; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 24px 20px 64px; }
.sub { color: var(--muted); margin: 0 0 20px; }

/* navegação */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--surface); border-bottom: 1px solid var(--border); }
.topbar-in { max-width: 1100px; margin: 0 auto; padding: 8px 20px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--text); white-space: nowrap; }
.nav { display: flex; gap: 2px; flex-wrap: wrap; flex: 1; min-width: 0; }
.topbar select { max-width: 190px; text-overflow: ellipsis; }
.nav a { color: var(--muted); padding: 6px 10px; border-radius: 8px; font-weight: 500; white-space: nowrap; }
.nav a:hover { background: var(--surface-2); text-decoration: none; color: var(--text); }
.nav a.on { background: var(--accent-soft); color: var(--accent); }

/* controles */
button, select, input[type=number], input[type=search], input[type=text] {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 7px 12px;
}
button { cursor: pointer; } button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: not-allowed; }
button:focus-visible, select:focus-visible, input:focus-visible, summary:focus-visible, .opt:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 600; }
.btn-danger { background: var(--bad); color: #fff; border-color: var(--bad); }
.btn-ghost { background: transparent; }
.icon-btn { padding: 6px 10px; }
.toggle { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--accent); width: 16px; height: 16px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 16px; }

/* superfícies */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.grid { display: grid; gap: var(--gap); }
.split { grid-template-columns: 3fr 2fr; align-items: start; } .split-r { grid-template-columns: 1fr 2fr; align-items: start; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } .g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.tile .num { font-size: 2rem; font-weight: 700; line-height: 1.1; } .tile .lbl { color: var(--muted); }
.empty { text-align: center; padding: 40px 16px; color: var(--muted); }
.err { background: var(--bad-soft); color: var(--bad); border-radius: 8px; padding: 10px 14px; }

/* barras */
.bar { display: flex; height: 10px; border-radius: 99px; overflow: hidden; background: var(--surface-2); }
.bar i { display: block; height: 100%; } .bar .firm { background: var(--good); } .bar .guessed { background: var(--warn); } .bar .wrong { background: var(--bad); }
.legend { display: flex; gap: 14px; font-size: .8rem; color: var(--muted); }
.legend b { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 5px; }
.dom { padding: 10px 0; border-top: 1px solid var(--border); } .dom:first-child { border-top: 0; }
.dom summary { list-style: none; cursor: pointer; } .dom summary::-webkit-details-marker { display: none; }
.dom-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.dom-head .name { font-weight: 600; } .dom-head .stat { margin-left: auto; color: var(--muted); font-size: .9rem; }
.chip { display: inline-block; font-size: .75rem; font-weight: 600; padding: 2px 8px; border-radius: 99px; background: var(--surface-2); color: var(--muted); white-space: nowrap; }
.chip.weight { background: var(--accent-soft); color: var(--accent); }
.obj { display: grid; grid-template-columns: 60px 1fr 120px; gap: 10px; align-items: center; padding: 4px 0; font-size: .88rem; }
.weak { display: flex; align-items: center; gap: 12px; padding: 9px 0; border-top: 1px solid var(--border); } .weak:first-of-type { border-top: 0; }
.weak .t { flex: 1; min-width: 0; }

/* badges de origem */
.badge { display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .02em; padding: 3px 9px; border-radius: 99px; color: #fff; text-transform: uppercase; }
.badge.official-sample { background: var(--b-official); } .badge.academy-reworded { background: var(--b-academy); }
.badge.review-based { background: var(--b-review); } .badge.diagnostic { background: var(--b-diagnostic); } .badge.generated { background: var(--b-generated); }
:root[data-theme="dark"] .badge { color: #0f1117; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .badge { color: #0f1117; } }

/* questão */
.qhead { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.qstem { font-size: 1.05rem; white-space: pre-wrap; margin-bottom: 16px; } .qstem pre { white-space: pre; }
mark.decisive { background: var(--mark); color: inherit; border-radius: 4px; padding: 1px 3px; box-shadow: 0 0 0 2px var(--mark); }
.opts { display: grid; gap: 8px; }
.opt { display: flex; gap: 12px; text-align: left; width: 100%; padding: 11px 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; align-items: flex-start; }
.opt .key { flex: none; width: 26px; height: 26px; border-radius: 50%; background: var(--surface-2); display: grid; place-items: center; font-weight: 700; font-size: .85rem; }
.opt .body { flex: 1; min-width: 0; } .opt .why { margin-top: 6px; font-size: .9rem; color: var(--muted); }
button.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.sel { border-color: var(--accent); background: var(--accent-soft); } .opt.sel .key { background: var(--accent); color: var(--on-accent); }
.opt.right { border-color: var(--good); background: var(--good-soft); } .opt.right .key { background: var(--good); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); } .opt.wrong .key { background: var(--bad); color: #fff; }
.opt .tag { font-size: .72rem; font-weight: 700; text-transform: uppercase; margin-left: 8px; }
.opt.right .tag { color: var(--good); } .opt.wrong .tag { color: var(--bad); }
.result { padding: 10px 14px; border-radius: 10px; font-weight: 600; margin: 16px 0 12px; }
.result.ok { background: var(--good-soft); color: var(--good); } .result.ko { background: var(--bad-soft); color: var(--bad); }
.rule { border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; padding: 10px 14px; margin: 14px 0 8px; }
.rule b { display: block; font-size: .75rem; text-transform: uppercase; color: var(--accent); letter-spacing: .04em; }
.docs { display: flex; gap: 14px; flex-wrap: wrap; font-size: .9rem; }
.actions { display: flex; gap: 10px; align-items: center; margin-top: 18px; flex-wrap: wrap; }
.kbd { font: .75rem ui-monospace, Consolas, monospace; background: var(--surface-2); border: 1px solid var(--border); border-radius: 5px; padding: 0 5px; color: var(--muted); }
.progress { color: var(--muted); font-size: .9rem; }

/* simulado */
.mockbar { display: flex; gap: 14px; align-items: center; position: sticky; top: 52px; z-index: 5; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 16px; margin-bottom: 16px; }
.timer { font: 700 1.3rem ui-monospace, Consolas, monospace; } .timer.low { color: var(--bad); }
.mockwrap { display: grid; grid-template-columns: 1fr 200px; gap: var(--gap); align-items: start; }
.pal { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.pal button { padding: 6px 0; font-size: .85rem; position: relative; }
.pal button.done { background: var(--accent-soft); border-color: var(--accent); }
.pal button.cur { background: var(--accent); color: var(--on-accent); }
.pal button.mk::after { content: ""; position: absolute; top: 3px; right: 3px; width: 7px; height: 7px; border-radius: 50%; background: var(--warn); }
.cfg { display: grid; gap: 16px; } .cfg label.f { display: grid; gap: 4px; font-weight: 600; font-size: .9rem; } .cfg input[type=number] { width: 110px; }
.checks { display: flex; gap: 8px 16px; flex-wrap: wrap; }
.presets { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap); }
.preset { text-align: left; padding: 16px; border-radius: var(--radius); } .preset.on { border-color: var(--accent); background: var(--accent-soft); }
.preset b { display: block; font-size: 1rem; }
.score { font-size: 2.4rem; font-weight: 800; line-height: 1; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin: 16px 0; }
.chips button.on { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }

/* listas com expansão (resultado, mistakes) */
details.item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 8px; }
details.item > summary { cursor: pointer; padding: 12px 16px; display: flex; gap: 10px; align-items: center; list-style: none; }
details.item > summary::-webkit-details-marker { display: none; }
details.item > summary::before { content: "▸"; color: var(--muted); } details.item[open] > summary::before { content: "▾"; }
details.item .sum { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
details.item .inner { padding: 0 16px 16px; }
.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; } .dot.ok { background: var(--good); } .dot.ko { background: var(--bad); } .dot.gs { background: var(--warn); } .dot.na { background: var(--muted); }

/* decision cards */
.dcard h3 { font-size: 1.05rem; } .dcard .decision { color: var(--muted); margin: 0 0 12px; }
.pair { display: grid; grid-template-columns: 1fr auto 1fr; gap: 8px; align-items: center; padding: 6px 0; border-top: 1px dashed var(--border); }
.pair:first-of-type { border-top: 0; }
.pair .c { font-weight: 600; } .pair .a { background: var(--accent-soft); color: var(--accent); border-radius: 8px; padding: 4px 10px; font-weight: 600; }
.pair .arrow { color: var(--muted); } .pair .w { grid-column: 1 / -1; font-size: .82rem; color: var(--muted); }
details.sig, details.trp { border-radius: 8px; margin-top: 8px; padding: 6px 12px; }
details.sig { background: var(--good-soft); color: var(--good); } details.trp { background: var(--bad-soft); color: var(--bad); }
details.sig summary, details.trp summary { cursor: pointer; font-weight: 700; font-size: .85rem; }
details.sig ul, details.trp ul { margin: 6px 0 4px; padding-left: 18px; color: var(--text); }
.secthead { margin: 28px 0 12px; display: flex; gap: 10px; align-items: baseline; } .secthead:first-child { margin-top: 0; }

/* tabelas, flashcards, tabs */
table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
th, td { text-align: left; padding: 10px 14px; border-top: 1px solid var(--border); vertical-align: top; } th { border-top: 0; background: var(--surface-2); font-size: .8rem; text-transform: uppercase; color: var(--muted); }
.st { font-weight: 600; white-space: nowrap; } .st.verified { color: var(--good); } .st.partial { color: var(--warn); } .st.unverified { color: var(--muted); }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tabs button { border: 0; border-bottom: 2px solid transparent; border-radius: 0; background: none; padding: 8px 16px; color: var(--muted); font-weight: 600; }
.tabs button.on { color: var(--accent); border-bottom-color: var(--accent); }
.flash { min-height: 220px; display: grid; place-items: center; text-align: center; cursor: pointer; padding: 28px; }
.flash .big { font-size: 1.5rem; font-weight: 700; } .flash .lbl { font-size: .75rem; text-transform: uppercase; color: var(--muted); letter-spacing: .06em; }
.danger { border-color: var(--bad); }
.overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, .5); display: grid; place-items: center; z-index: 50; padding: 16px; }
.overlay .card { max-width: 420px; width: 100%; }

@media (max-width: 860px) {
  .g3, .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .split, .split-r { grid-template-columns: 1fr; }
  .mockwrap { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .g2, .g3, .g4, .presets { grid-template-columns: 1fr; }
  .filters select, .filters input[type=search] { flex: 1 1 100%; min-width: 0 !important; max-width: 100%; } .topbar select { max-width: 100px; }
  .wrap { padding: 16px 12px 48px; } .obj { grid-template-columns: 50px 1fr; } .obj .bar { grid-column: 1 / -1; }
  .pair { grid-template-columns: 1fr; } .pair .arrow { display: none; } .pair .a { justify-self: start; }
}