:root {
  --bg: #f4f6f9; --card: #fff; --txt: #1b2430; --mut: #5b6675; --brd: #d5dbe3;
  --pri: #1f4e78; --pri2: #173a5a; --ok: #1e7a45; --okbg: #e6f4ec; --err: #a12622; --errbg: #fbeaea;
  --sel: #dbeafe;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12171d; --card: #1b232d; --txt: #e8edf3; --mut: #9aa6b5; --brd: #34404d;
    --pri: #5b9bd5; --pri2: #8dbbe6; --ok: #62c58a; --okbg: #17301f; --err: #f08a85; --errbg: #3a1d1c;
    --sel: #1f3a57;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--txt); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
h1 { font-size: 1.35rem; line-height: 1.3; margin: .2rem 0 .8rem; }
h2 { font-size: 1.1rem; }
.peq { font-size: .85rem; color: var(--mut); }
.centro { text-align: center; }
.cartao { max-width: 640px; margin: 1.2rem auto; padding: 1.2rem 16px; background: var(--card); border: 1px solid var(--brd); border-radius: 12px; }
.estreito { max-width: 380px; }
.largo { max-width: 1280px; margin: 0 auto; padding: 16px; }
label { display: block; margin: .8rem 0 .25rem; font-weight: 600; font-size: .9rem; }
input, select, textarea { width: 100%; padding: .65rem .7rem; font: inherit; color: var(--txt); background: var(--card); border: 1px solid var(--brd); border-radius: 8px; }
textarea { resize: vertical; }
.btn { display: inline-block; padding: .6rem 1rem; font: inherit; font-weight: 600; color: #fff; background: var(--pri); border: 0; border-radius: 8px; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--pri2); }
.btn.sec { background: transparent; color: var(--pri); border: 1px solid var(--pri); }
.btn.grande { width: 100%; padding: .9rem; font-size: 1.05rem; margin-top: 1rem; }
.btn.pequeno { padding: .3rem .55rem; font-size: .8rem; }
.btn[disabled] { opacity: .45; cursor: default; }
.ok, .erro { padding: .7rem .9rem; border-radius: 8px; margin: .8rem 0; }
.ok { background: var(--okbg); color: var(--ok); border: 1px solid var(--ok); }
.erro { background: var(--errbg); color: var(--err); border: 1px solid var(--err); }

/* ---- prova (aluno) ---- */
.semselecao, .semselecao * { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
.semselecao input { -webkit-user-select: text; user-select: text; }
.prova { max-width: 720px; margin: 0 auto; padding: 12px 14px 90px; }
.prova-topo { position: sticky; top: 0; z-index: 5; background: var(--bg); padding: 8px 0 6px; }
.prova-topo .linha-topo { display: flex; justify-content: space-between; align-items: center; font-size: .9rem; color: var(--mut); }
.barra { height: 6px; background: var(--brd); border-radius: 3px; margin-top: 6px; overflow: hidden; }
.barra > i { display: block; height: 100%; background: var(--pri); width: 0; transition: width .2s; }
.questao { background: var(--card); border: 1px solid var(--brd); border-radius: 12px; padding: 14px; margin-top: 10px; }
.questao .enun { font-size: 1.05rem; margin: 0 0 12px; }
.figuras { display: grid; gap: 8px; margin: 0 0 12px; }
.figuras img { width: 100%; height: auto; border-radius: 8px; background: #000; display: block; -webkit-user-drag: none; user-drag: none; pointer-events: auto; }
.figuras .fonte { font-size: .72rem; color: var(--mut); }
.alt { display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left; margin: 0 0 8px; padding: 12px; font: inherit; color: var(--txt); background: var(--card); border: 2px solid var(--brd); border-radius: 10px; cursor: pointer; }
.alt .letra { flex: 0 0 28px; height: 28px; border-radius: 50%; background: var(--brd); font-weight: 700; display: grid; place-items: center; font-size: .85rem; }
.alt.marcada { border-color: var(--pri); background: var(--sel); }
.alt.marcada .letra { background: var(--pri); color: #fff; }
.nav { position: fixed; left: 0; right: 0; bottom: 0; background: var(--card); border-top: 1px solid var(--brd); padding: 10px 14px calc(10px + env(safe-area-inset-bottom)); display: flex; gap: 8px; justify-content: center; z-index: 6; }
.nav .btn { flex: 1; max-width: 220px; }
.grade { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; margin: 10px 0; }
.grade button { padding: .55rem 0; font: inherit; font-weight: 600; color: var(--txt); background: var(--card); border: 2px solid var(--brd); border-radius: 8px; cursor: pointer; }
.grade button.resp { background: var(--sel); border-color: var(--pri); }
.grade button.atual { outline: 3px solid var(--pri); }
.estado { font-size: .78rem; color: var(--mut); }
.estado.falha { color: var(--err); font-weight: 600; }
#cobertura { position: fixed; inset: 0; z-index: 50; background: var(--bg); display: grid; place-items: center; text-align: center; padding: 20px; }
#cobertura[hidden] { display: none; }
#marca { position: fixed; inset: 0; z-index: 40; pointer-events: none; background-repeat: repeat; opacity: .5; }
.zoom { position: fixed; inset: 0; z-index: 30; background: #000; display: flex; flex-direction: column; }
.zoom .barra-zoom { display: flex; gap: 8px; padding: 8px; justify-content: center; background: #111; }
.zoom .area { flex: 1; overflow: auto; -webkit-overflow-scrolling: touch; }
.zoom img { display: block; width: 100%; max-width: none; height: auto; }
@media print { body { display: none !important; } }

/* ---- painel ---- */
.topo { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; background: var(--pri); color: #fff; }
.topo .btn { background: rgba(255,255,255,.18); }
.linha { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 10px 0; }
.linha select { width: auto; max-width: 100%; }
.acoes form { margin: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 12px 0; }
.card { background: var(--card); border: 1px solid var(--brd); border-radius: 10px; padding: 10px 12px; }
.card span { display: block; font-size: .78rem; color: var(--mut); }
.card strong { font-size: 1.4rem; }
.bloco { background: var(--card); border: 1px solid var(--brd); border-radius: 10px; padding: 10px 14px; margin: 12px 0; }
.bloco summary { cursor: pointer; font-weight: 600; }
.tabela { overflow-x: auto; background: var(--card); border: 1px solid var(--brd); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: .88rem; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--brd); text-align: left; vertical-align: top; }
th { background: var(--bg); position: sticky; top: 0; white-space: nowrap; }
td.botoes { white-space: nowrap; }
td.botoes form, td.botoes button { display: inline-block; margin: 2px 2px 2px 0; }
.obs { display: flex; gap: 4px; }
.obs input { min-width: 130px; padding: .3rem .4rem; font-size: .8rem; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: .78rem; font-weight: 600; }
.tag.v { background: var(--okbg); color: var(--ok); }
.tag.a { background: #fff3cd; color: #7a5b00; }
.tag.c { background: var(--brd); color: var(--mut); }