:root {
  --bg: #fffdf8; --card: #ffffff; --texto: #111827; --suave: #374151; --borda: #9ca3af;
  --primaria: #1e3a8a; --sobre-primaria: #ffffff; --realce: #fef3c7; --realce-borda: #b45309;
  --ok: #14532d; --ok-bg: #dcfce7; --erro: #991b1b; --erro-bg: #fee2e2; --foco: #b45309;
  --raio: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="claro"]) {
    --bg: #0b1220; --card: #111c33; --texto: #f3f4f6; --suave: #d1d5db; --borda: #6b7280;
    --primaria: #93c5fd; --sobre-primaria: #0b1220; --realce: #3b2f08; --realce-borda: #fbbf24;
    --ok: #86efac; --ok-bg: #052e16; --erro: #fca5a5; --erro-bg: #450a0a; --foco: #fbbf24;
  }
}
:root[data-tema="escuro"] {
  --bg: #0b1220; --card: #111c33; --texto: #f3f4f6; --suave: #d1d5db; --borda: #6b7280;
  --primaria: #93c5fd; --sobre-primaria: #0b1220; --realce: #3b2f08; --realce-borda: #fbbf24;
  --ok: #86efac; --ok-bg: #052e16; --erro: #fca5a5; --erro-bg: #450a0a; --foco: #fbbf24;
}
* { box-sizing: border-box; }
html { font-size: 112.5%; } /* 18px */
body {
  margin: 0; background: var(--bg); color: var(--texto);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6; padding-bottom: 5.5rem;
}
:focus-visible { outline: 3px solid var(--foco); outline-offset: 2px; }
.pular { position: absolute; left: -999px; top: 0; background: var(--primaria); color: var(--sobre-primaria); padding: .75rem; z-index: 99; }
.pular:focus { left: 0; }
.topo {
  display: flex; justify-content: space-between; align-items: center; gap: .5rem;
  padding: .5rem 1rem; background: var(--primaria); color: var(--sobre-primaria);
  position: sticky; top: 0; z-index: 10;
}
.marca { color: inherit; text-decoration: none; font-weight: 700; font-size: 1.05rem; }
.btn-icone { min-width: 48px; min-height: 48px; font-size: 1.4rem; background: transparent; color: inherit; border: 2px solid currentColor; border-radius: 12px; cursor: pointer; }
main { max-width: 46rem; margin: 0 auto; padding: 1rem; }
h1 { font-size: 1.6rem; line-height: 1.25; margin: .5rem 0 1rem; }
h2 { font-size: 1.3rem; line-height: 1.3; margin: 1.6rem 0 .6rem; }
h3 { font-size: 1.15rem; margin: 1.2rem 0 .4rem; }
p, li { max-width: 65ch; }
a { color: var(--primaria); text-underline-offset: 3px; }
.suave { color: var(--suave); }
.pequeno { font-size: .9rem; }

.menu {
  position: fixed; bottom: 0; left: 0; right: 0; display: grid; grid-template-columns: repeat(5, 1fr);
  background: var(--card); border-top: 2px solid var(--borda); z-index: 10;
  padding-bottom: env(safe-area-inset-bottom);
}
.menu a {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 60px; font-size: .78rem; font-weight: 600; color: var(--suave); text-decoration: none; padding: .25rem 0;
}
.menu a span { font-size: 1.4rem; line-height: 1.2; }
.menu a[aria-current="page"] { color: var(--primaria); background: var(--realce); box-shadow: inset 0 3px 0 var(--primaria); }

.card { background: var(--card); border: 2px solid var(--borda); border-radius: var(--raio); padding: 1rem; margin: 0 0 1rem; }
.card h2:first-child, .card h3:first-child { margin-top: 0; }
.contagem { text-align: center; background: var(--primaria); color: var(--sobre-primaria); border-color: var(--primaria); }
.contagem .num { font-size: 3.4rem; font-weight: 800; line-height: 1.1; display: block; }
.contagem p { margin: .2rem auto; }

.btn {
  display: flex; align-items: center; justify-content: center; gap: .5rem; width: 100%;
  min-height: 56px; padding: .75rem 1rem; margin: .5rem 0; font: inherit; font-weight: 700; text-align: center; text-decoration: none;
  background: var(--primaria); color: var(--sobre-primaria); border: 2px solid var(--primaria); border-radius: var(--raio); cursor: pointer;
}
.btn.sec { background: var(--card); color: var(--primaria); }
.btn.ok { background: var(--ok); border-color: var(--ok); color: var(--bg); }
.btn.erro { background: var(--erro); border-color: var(--erro); color: var(--bg); }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.btn.auto { width: auto; display: inline-flex; }
.linha { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }

.barra { height: 14px; background: var(--borda); border-radius: 99px; overflow: hidden; margin: .3rem 0 .8rem; }
.barra > i { display: block; height: 100%; background: var(--primaria); }
.grande { font-size: 2.2rem; font-weight: 800; line-height: 1.1; }

.lista { list-style: none; padding: 0; margin: 0; }
.lista li { margin: 0 0 .6rem; max-width: none; }
.lista a.item {
  display: flex; align-items: center; gap: .75rem; min-height: 56px; padding: .6rem .9rem;
  background: var(--card); border: 2px solid var(--borda); border-radius: var(--raio); color: var(--texto); text-decoration: none; font-weight: 600;
}
.lista a.item small { display: block; font-weight: 400; color: var(--suave); }
.lista .marca-ok { margin-left: auto; font-size: 1.3rem; }

label { display: block; font-weight: 700; margin: .6rem 0 .2rem; }
select, input[type="file"] { width: 100%; min-height: 52px; font: inherit; padding: .5rem; background: var(--card); color: var(--texto); border: 2px solid var(--borda); border-radius: 12px; }

.aviso { background: var(--realce); border: 2px solid var(--realce-borda); border-radius: var(--raio); padding: .75rem 1rem; margin: 0 0 1rem; }
.caixa-prova { background: var(--realce); border: 3px solid var(--realce-borda); border-radius: var(--raio); padding: .5rem 1rem 1rem; margin: 1.2rem 0; }
.caixa-prova h2 { margin-top: .6rem; }
.fonte { display: inline-flex; align-items: center; min-height: 48px; font-weight: 700; }

.md ul, .md ol { padding-left: 1.4rem; } .md li { margin-bottom: .35rem; }
.md blockquote { margin: 1rem 0; padding: .1rem 1rem; border-left: 5px solid var(--primaria); background: var(--card); }
.md code { background: var(--card); border: 1px solid var(--borda); border-radius: 6px; padding: 0 .3rem; }
.md hr { border: 0; border-top: 2px solid var(--borda); margin: 1.5rem 0; }

/* Flashcards */
.flash {
  display: flex; align-items: center; justify-content: center; text-align: center; width: 100%;
  min-height: 15rem; padding: 1.2rem; margin: .8rem 0; font: inherit; font-size: 1.25rem; font-weight: 600; line-height: 1.5;
  background: var(--card); color: var(--texto); border: 3px solid var(--primaria); border-radius: 18px; cursor: pointer;
}
.flash.verso { background: var(--realce); border-color: var(--realce-borda); font-weight: 500; text-align: left; justify-content: flex-start; }
.flash span { white-space: pre-line; }
.flash .rotulo { display: block; font-size: .85rem; font-weight: 700; color: var(--suave); text-transform: uppercase; margin-bottom: .5rem; }
.contador { text-align: center; font-weight: 700; }

/* Quiz */
.alt {
  display: flex; gap: .75rem; width: 100%; min-height: 56px; text-align: left; padding: .75rem 1rem; margin: .6rem 0;
  font: inherit; color: var(--texto); background: var(--card); border: 2px solid var(--borda); border-radius: var(--raio); cursor: pointer;
}
.alt b { flex: 0 0 auto; min-width: 1.6rem; }
.alt.marcada { border-color: var(--primaria); border-width: 4px; }
.alt.certa { background: var(--ok-bg); border-color: var(--ok); }
.alt.errada { background: var(--erro-bg); border-color: var(--erro); }
.explica { border-left: 6px solid var(--primaria); background: var(--card); padding: .75rem 1rem; border-radius: 8px; margin: 1rem 0; }
.cron { position: sticky; top: 64px; z-index: 5; text-align: center; font-weight: 800; background: var(--card); border: 2px solid var(--borda); border-radius: 12px; padding: .3rem; margin-bottom: .8rem; }
.cron.alerta { background: var(--erro-bg); color: var(--erro); border-color: var(--erro); }

/* Plano */
.bloco.hoje { border-color: var(--realce-borda); border-width: 4px; background: var(--realce); }
.etiqueta { display: inline-block; font-size: .8rem; font-weight: 800; padding: .1rem .6rem; border-radius: 99px; background: var(--primaria); color: var(--sobre-primaria); }
.check { display: flex; gap: .75rem; align-items: flex-start; min-height: 48px; padding: .4rem 0; font-weight: 400; margin: 0; }
.check input { width: 28px; height: 28px; flex: 0 0 auto; margin-top: .15rem; accent-color: var(--primaria); }
.prazo { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.prazo.passou { opacity: .6; }
details summary { min-height: 48px; display: flex; align-items: center; font-weight: 700; cursor: pointer; }
.carregando { text-align: center; padding: 3rem 0; }
.modal-fundo { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; padding: 1rem; background: rgba(0, 0, 0, .6); }
.modal { width: 100%; max-width: 26rem; background: var(--card); color: var(--texto); border: 3px solid var(--primaria); border-radius: 20px; padding: 1.25rem; box-shadow: 0 12px 40px rgba(0, 0, 0, .4); text-align: center; }
.modal h2 { margin: .2rem 0 .5rem; }
.modal p { margin: 0 auto 1rem; }
@media (min-width: 700px) { .flash { min-height: 18rem; font-size: 1.4rem; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }