:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #5f6368;
  --border: #e2e2de;
  --accent: #b3261e;
  --link: #1a5fb4;
  --ok: #1e7f4f;
  --code-bg: #f0f0ec;
  --radius: 10px;
  --sidebar: 280px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --surface: #1d1d20;
    --text: #ececec;
    --muted: #a0a0a8;
    --border: #2e2e33;
    --accent: #f2766b;
    --link: #7fb0ff;
    --ok: #5cc98f;
    --code-bg: #26262b;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--link); }
h1, h2, h3 { line-height: 1.25; }

.topo {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.marca { font-weight: 700; color: var(--text); text-decoration: none; }
.marca span { color: var(--accent); }
.topo-acoes { display: flex; align-items: center; gap: 12px; }
.topo-acoes form { margin: 0; }
.selo { font-size: 13px; padding: 2px 10px; border: 1px solid var(--border); border-radius: 999px; }
.selo-instrutor { color: var(--accent); }
.selo-aluno { color: var(--link); }
.btn-link { padding: 0; border: 0; background: none; color: var(--link); font: inherit; cursor: pointer; }

.conteudo { max-width: 960px; margin: 0 auto; padding: 24px 16px 64px; }
.subtitulo { color: var(--muted); font-size: 19px; }
.nota { color: var(--muted); font-size: 15px; }

.portas { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 24px; }
.porta {
  display: block; padding: 28px;
  background: var(--surface); color: var(--text); text-decoration: none;
  border: 1px solid var(--border); border-radius: var(--radius);
}
.porta:hover, .porta:focus-visible { border-color: var(--link); }
.porta h2 { margin: 0 0 8px; }
.porta p { margin: 0; color: var(--muted); }

.cartao { padding: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.login { max-width: 420px; margin: 32px auto; }
.campo { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.campo input {
  padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
}
.btn {
  display: inline-block; padding: 10px 18px; font: inherit; text-decoration: none; cursor: pointer;
  color: #fff; background: var(--link); border: 1px solid var(--link); border-radius: 8px;
}
.btn-sec { color: var(--link); background: transparent; }
.erro { color: var(--accent); }

.layout {
  display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); gap: 32px;
  max-width: 1280px; margin: 0 auto; padding: 24px 16px 64px;
}
.lateral {
  position: sticky; top: 72px; align-self: start;
  max-height: calc(100vh - 96px); overflow: auto; font-size: 15px;
}
.lateral ul { margin: 0; padding-left: 14px; list-style: none; }
.lateral > ul { padding-left: 0; }
.lateral li { margin: 4px 0; }
.lateral a { color: var(--text); text-decoration: none; }
.lateral a:hover { text-decoration: underline; }
.lateral a[aria-current="page"] { color: var(--accent); font-weight: 600; }
.lateral .grupo { color: var(--muted); font-weight: 600; }
.lateral .atalho { display: block; margin-bottom: 16px; }

article { min-width: 0; overflow-wrap: anywhere; }
article table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; }
article th, article td { padding: 6px 10px; text-align: left; vertical-align: top; border: 1px solid var(--border); }
article th { background: var(--code-bg); }
article code { padding: 1px 5px; font-size: .9em; background: var(--code-bg); border-radius: 4px; }
article pre { padding: 12px; overflow-x: auto; background: var(--code-bg); border-radius: var(--radius); }
article pre code { padding: 0; background: none; }
article blockquote {
  margin: 16px 0; padding: 8px 16px;
  background: var(--surface); border-left: 4px solid var(--link); border-radius: 0 8px 8px 0;
}
.task-list-item { list-style: none; }

.progresso { height: 10px; overflow: hidden; background: var(--border); border-radius: 999px; }
.progresso-barra { width: 0; height: 100%; background: var(--ok); transition: width .3s; }
.trilha-seletor { display: flex; flex-wrap: wrap; gap: 16px; margin: 16px 0; padding: 0; border: 0; }
.modulo { margin-top: 28px; }
.aulas { margin: 0; padding: 0; list-style: none; }
.aulas li {
  display: flex; justify-content: space-between; gap: 12px; margin-bottom: 8px; padding: 12px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
}
.aulas li.feita a::before, .lateral li.feita a::before { content: "✓ "; color: var(--ok); }
.duracao { color: var(--muted); font-size: 14px; white-space: nowrap; }
.navegacao-aula { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 40px; }
.marcar[aria-pressed="true"] { background: var(--ok); border-color: var(--ok); }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; gap: 16px; }
  .lateral { position: static; max-height: none; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
}

.faixa-host { padding: 8px 16px; color: #fff; background: var(--accent); font-size: 15px; }
.faixa-host a { color: #fff; font-weight: 600; }
.aviso { border-color: var(--accent); }
.mensagem { min-height: 1.6em; }
.mensagem.erro { color: var(--accent); }
.dados { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 0 0 16px; }
.dados dt { color: var(--muted); }
.dados dd { margin: 0; }
.acoes { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.acoes input { width: 5em; padding: 6px 8px; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; }
.turmas { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.turma { display: flex; flex-direction: column; gap: 6px; padding: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.turma.ativa { border-color: var(--ok); }
.tabela { width: 100%; margin-top: 16px; border-collapse: collapse; display: block; overflow-x: auto; }
.tabela th, .tabela td { padding: 6px 10px; text-align: left; border-bottom: 1px solid var(--border); }
.operacoes { padding-left: 18px; font-size: 15px; }
.op-erro { color: var(--accent); }
.op-ok strong { color: var(--ok); }
section { margin-top: 24px; }

.op { padding: 12px 0; border-bottom: 1px solid var(--border); }
.op:last-child { border-bottom: 0; }
.op-cabecalho { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; }
.op-etapa { margin: 6px 0; color: var(--muted); font-size: 15px; }
.op .progresso { margin-top: 6px; }
.op-erro .progresso-barra { background: var(--accent); }
.op details { margin-top: 6px; font-size: 14px; }
.op pre { max-height: 220px; margin: 6px 0 0; padding: 8px; overflow: auto; white-space: pre-wrap; background: var(--code-bg); border-radius: 8px; }
.detalhe-saude { display: block; color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
button[disabled] { cursor: not-allowed; opacity: .5; }