:root {
  --navy: #0b1628; --fundo: #070f1d; --vidro: rgba(255, 255, 255, .045); --vidro-forte: rgba(255, 255, 255, .08);
  --linha: rgba(255, 255, 255, .1); --texto: #e9ecf4; --suave: #a6b4ca; --apagado: #6f7f99;
  --ouro: #c9a449; --ouro-claro: #e8cf8a; --ciano: #2dd4bf; --verde: #34d399; --vermelho: #f87171; --ambar: #fbbf24;
  --f-tit: 'Playfair Display', Georgia, serif; --f-ui: 'Montserrat', system-ui, sans-serif; --f-cod: 'JetBrains Mono', ui-monospace, monospace;
  --raio: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--fundo); color: var(--texto); font: 16px/1.6 var(--f-ui); -webkit-font-smoothing: antialiased; }
a { color: var(--ouro-claro); }
img, svg { max-width: 100%; }
code { font-family: var(--f-cod); font-size: .9em; background: rgba(45, 212, 191, .1); color: #99f6e4; padding: 1px 6px; border-radius: 6px; }
.pular { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--ouro); color: #111; padding: 8px 14px; border-radius: 8px; }
.pular:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--ouro-claro); outline-offset: 3px; }

.fundo { position: fixed; inset: 0; z-index: -1; overflow: hidden; background: radial-gradient(1200px 600px at 80% -10%, rgba(45, 212, 191, .12), transparent 60%), radial-gradient(900px 500px at 0% 110%, rgba(201, 164, 73, .12), transparent 60%), var(--fundo); }
.fundo i { position: absolute; width: 40vmax; height: 40vmax; border-radius: 50%; filter: blur(90px); opacity: .18; animation: flutua 26s ease-in-out infinite alternate; }
.fundo i:nth-child(1) { background: #1d4ed8; left: -10vmax; top: 10vh; }
.fundo i:nth-child(2) { background: #0d9488; right: -12vmax; top: 30vh; animation-delay: -8s; }
.fundo i:nth-child(3) { background: #a16207; left: 30vw; bottom: -20vmax; animation-delay: -16s; opacity: .12; }
@keyframes flutua { to { transform: translate(6vmax, -4vmax) scale(1.1); } }

.barra { position: sticky; top: 0; z-index: 40; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px clamp(16px, 4vw, 40px); background: rgba(7, 15, 29, .82); backdrop-filter: blur(14px); border-bottom: 1px solid var(--linha); }
.barra__marca { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.selo { font: 700 .66rem/1 var(--f-ui); letter-spacing: .18em; color: #0b1628; background: linear-gradient(135deg, var(--ouro-claro), var(--ouro)); padding: 6px 10px; border-radius: 99px; }
.selo--cor { background: color-mix(in srgb, var(--cor, var(--ciano)) 22%, transparent); color: var(--cor, var(--ciano)); letter-spacing: .06em; }
.barra__menu { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.barra__menu > a:not(.btn) { color: var(--suave); text-decoration: none; font-weight: 600; font-size: .92rem; }
.barra__menu > a.ativo, .barra__menu > a:hover { color: var(--texto); }
.barra__quem { display: grid; line-height: 1.15; text-align: right; }
.barra__quem small { color: var(--apagado); font-size: .72rem; }

.conteudo { flex: 1; width: 100%; max-width: 1280px; margin: 0 auto; padding: 28px clamp(16px, 4vw, 40px) 60px; }
.rodape { display: flex; align-items: center; justify-content: center; gap: 12px; padding: 22px 16px 28px; color: var(--apagado); font-size: .78rem; text-align: center; border-top: 1px solid var(--linha); }
.rodape p { margin: 0; }
.rodape a { color: var(--suave); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 22px; border-radius: 99px; border: 1px solid transparent; font: 700 .92rem var(--f-ui); text-decoration: none; cursor: pointer; transition: transform .15s, box-shadow .2s, background .2s; }
.btn:active { transform: scale(.97); }
.btn--ouro { background: linear-gradient(135deg, var(--ouro-claro), var(--ouro)); color: #1a1405; box-shadow: 0 10px 30px rgba(201, 164, 73, .25); }
.btn--ouro:hover { box-shadow: 0 14px 40px rgba(201, 164, 73, .4); }
.btn--vidro { background: var(--vidro-forte); color: var(--texto); border-color: var(--linha); }
.btn--vidro:hover { background: rgba(255, 255, 255, .13); }
.btn--pequeno { padding: 8px 14px; font-size: .82rem; }
.btn:disabled { opacity: .4; cursor: default; }
.btn--brilho { position: relative; overflow: hidden; }
.btn--brilho::after { content: ''; position: absolute; inset: 0; background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, .55) 50%, transparent 70%); transform: translateX(-100%); animation: brilho 3.5s ease-in-out infinite; }
@keyframes brilho { 60%, 100% { transform: translateX(100%); } }
.btn-texto { background: none; border: 0; color: var(--ouro-claro); font: 600 .9rem var(--f-ui); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

.vidro { background: var(--vidro); border: 1px solid var(--linha); border-radius: var(--raio); backdrop-filter: blur(8px); }
.bloco { padding: clamp(18px, 3vw, 30px); margin-bottom: 22px; }
.bloco__topo { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.sobretitulo { margin: 0 0 6px; font: 700 .72rem/1.2 var(--f-ui); letter-spacing: .18em; text-transform: uppercase; color: var(--ouro); }
.manchete { margin: 0; font: 700 clamp(2rem, 4.6vw, 3.4rem)/1.08 var(--f-tit); letter-spacing: -.01em; }
.manchete em { font-style: italic; color: var(--ouro-claro); }
.manchete--media { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
.titulo-bloco { margin: 0 0 14px; font: 700 1.3rem/1.25 var(--f-tit); }
.suave { color: var(--suave); }
.pequeno { font-size: .84rem; }
.entrada__sub { color: var(--suave); font-size: 1.1rem; margin: 10px 0 0; max-width: 760px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 16px 0 0; }
.chips li { padding: 6px 12px; border-radius: 99px; background: var(--vidro-forte); border: 1px solid var(--linha); font-size: .82rem; color: var(--suave); }
.chips b { color: var(--texto); }
.acoes { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 18px; }
.grade-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; }
.rolagem { overflow-x: auto; }
.tabela { width: 100%; border-collapse: collapse; font-size: .92rem; }
.tabela th, .tabela td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--linha); vertical-align: top; }
.tabela th { color: var(--ouro-claro); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }
.voltar { display: inline-block; margin-bottom: 14px; color: var(--suave); text-decoration: none; font-weight: 600; font-size: .9rem; }
.texto-longo { max-width: 820px; }

.avisos { position: fixed; top: 76px; right: 16px; z-index: 60; display: grid; gap: 10px; max-width: min(420px, calc(100vw - 32px)); }
.aviso { position: relative; padding: 14px 44px 14px 16px; border-radius: 14px; background: #10203a; border: 1px solid var(--linha); border-left: 4px solid var(--verde); box-shadow: 0 16px 40px rgba(0, 0, 0, .4); transition: opacity .5s, transform .5s; }
.aviso--erro { border-left-color: var(--vermelho); }
.aviso--info { border-left-color: var(--ouro); }
.aviso.saindo { opacity: 0; transform: translateX(20px); }
.aviso--fixo { position: static; box-shadow: none; margin: 12px 0; }
.aviso__x { position: absolute; right: 10px; top: 8px; background: none; border: 0; color: var(--suave); font-size: 1.4rem; cursor: pointer; }

.campo { display: grid; gap: 6px; margin-bottom: 14px; }
.campo span { font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--suave); }
.campo input { width: 100%; padding: 13px 14px; border-radius: 12px; border: 1px solid var(--linha); background: rgba(0, 0, 0, .25); color: var(--texto); font: 1rem var(--f-ui); }
.campo input:focus { border-color: var(--ouro); outline: none; box-shadow: 0 0 0 3px rgba(201, 164, 73, .25); }

/* ---------- entrada e instalação ---------- */
.pagina-entrada .conteudo { display: grid; place-items: center; }
.entrada { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(24px, 6vw, 80px); align-items: center; width: 100%; max-width: 1080px; min-height: 70vh; }
.entrada__texto img { margin-bottom: 26px; }
.cartao-acesso { padding: 32px; }
.cartao-acesso h2 { margin: 0 0 18px; font: 700 1.6rem var(--f-tit); }
.cartao-acesso .btn { width: 100%; margin-top: 6px; }
.instalar { width: 100%; max-width: 760px; }
.form-grade { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
.form-grade .titulo-bloco, .form-grade .btn { grid-column: 1 / -1; }
.form-grade .titulo-bloco { margin-top: 12px; }
@media (max-width: 760px) { .entrada, .form-grade { grid-template-columns: 1fr; } .barra__quem { display: none; } }

/* ---------- painel ---------- */
.saudacao { margin: 10px 0 28px; }
.grade-aulas { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 520px), 1fr)); gap: 22px; }
.cartao-aula { padding: 28px; position: relative; overflow: hidden; }
.cartao-aula::before { content: ''; position: absolute; inset: 0 0 auto; height: 4px; background: linear-gradient(90deg, var(--cor), transparent); }
.cartao-aula__topo { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: center; }
.cartao-aula h2 { margin: 16px 0 6px; font: 700 1.7rem/1.15 var(--f-tit); }
.cartao-aula p { color: var(--suave); margin: 0; }

/* ---------- aula ---------- */
.aula-capa { padding: 8px 0 18px; }
.abas { position: sticky; top: 61px; z-index: 30; display: flex; gap: 6px; overflow-x: auto; padding: 10px 0; margin-bottom: 18px; background: linear-gradient(var(--fundo) 70%, transparent); }
.abas a { flex: none; padding: 10px 18px; border-radius: 99px; text-decoration: none; color: var(--suave); font-weight: 700; font-size: .9rem; border: 1px solid var(--linha); background: var(--vidro); }
.abas a.ativa { background: linear-gradient(135deg, var(--ouro-claro), var(--ouro)); color: #1a1405; border-color: transparent; }
.plano { display: grid; grid-template-columns: 270px 1fr; gap: 26px; align-items: start; }
.plano-indice { position: sticky; top: 124px; max-height: calc(100vh - 140px); overflow: auto; padding: 18px; border-radius: var(--raio); background: var(--vidro); border: 1px solid var(--linha); font-size: .86rem; }
.plano-indice > b { display: block; margin-bottom: 10px; color: var(--ouro-claro); }
.plano-indice ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.plano-indice a { display: grid; grid-template-columns: 44px 1fr; gap: 6px; padding: 7px 8px; border-radius: 10px; color: var(--suave); text-decoration: none; line-height: 1.3; }
.plano-indice a:hover { background: var(--vidro-forte); color: var(--texto); }
.plano-indice time { font: 600 .78rem var(--f-cod); color: var(--ciano); }
.lista-obj li, .texto li { margin-bottom: 6px; }
.texto > :first-child { margin-top: 0; }
.texto h3, .texto h4 { margin: 18px 0 8px; }
.momento { scroll-margin-top: 120px; }
.momento__topo { display: grid; grid-template-columns: auto 1fr auto; gap: 18px; align-items: center; margin-bottom: 14px; }
.momento__topo h2 { margin: 0; font: 700 1.45rem/1.2 var(--f-tit); }
.momento__hora { font: 700 1rem var(--f-cod); color: #0b1628; background: var(--ciano); padding: 10px 12px; border-radius: 12px; white-space: nowrap; }
.momento__obj { padding: 12px 16px; border-radius: 12px; background: rgba(201, 164, 73, .08); border: 1px solid rgba(201, 164, 73, .25); margin: 0 0 18px; }
.parte { margin: 0 0 18px; padding: 18px 20px; border-radius: 14px; background: rgba(0, 0, 0, .18); border: 1px solid var(--linha); }
.parte h3 { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font-size: 1.02rem; }
.parte h3 span { display: grid; place-items: center; width: 28px; height: 28px; flex: none; border-radius: 50%; background: var(--vidro-forte); color: var(--ouro-claro); font-size: .85rem; }
.parte h3 small { color: var(--apagado); font-weight: 500; margin-left: 6px; }
.parte--faca { border-left: 4px solid var(--ouro); }
.parte--explique { border-left: 4px solid var(--ciano); }
.parte--aluno { border-left: 4px solid #818cf8; }
.parte--confira { border-left: 4px solid var(--verde); }
.parte--erros { border-left: 4px solid var(--vermelho); }
.parte--codigo summary { cursor: pointer; list-style: none; }
.parte--codigo summary::-webkit-details-marker { display: none; }
.parte--codigo summary h3 { margin: 0; }
.parte--codigo[open] summary h3 { margin-bottom: 12px; }
.pergunte { margin: 0; padding: 14px 18px; border-radius: 12px; background: rgba(129, 140, 248, .1); border: 1px dashed rgba(129, 140, 248, .5); }
.nota { margin: 14px 0; padding: 12px 16px; border-radius: 12px; background: rgba(45, 212, 191, .08); border: 1px solid rgba(45, 212, 191, .3); }
.nota > b { display: block; font-size: .76rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ciano); margin-bottom: 4px; }
.nota p { margin: 0; }
.nota--atencao, .nota--seguranca { background: rgba(248, 113, 113, .08); border-color: rgba(248, 113, 113, .35); }
.nota--atencao > b, .nota--seguranca > b { color: var(--vermelho); }
.nota--professor { background: rgba(201, 164, 73, .08); border-color: rgba(201, 164, 73, .35); }
.nota--professor > b { color: var(--ouro-claro); }
pre.cod { margin: 12px 0; padding: 14px 16px; border-radius: 12px; background: #0a1322; border: 1px solid var(--linha); overflow-x: auto; font: .86rem/1.55 var(--f-cod); color: #dbe4f3; }
pre.cod code { background: none; padding: 0; color: inherit; }

.grade-circ { display: grid; grid-template-columns: 1.45fr 1fr; gap: 22px; align-items: start; }
.circ-grande { border-radius: 14px; background: rgba(0, 0, 0, .2); padding: 8px; }
.circ-controle { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 14px 0; flex-wrap: wrap; }
.circ-controle span { font-weight: 700; color: var(--ouro-claro); text-align: center; flex: 1; }
.mont-lista { padding-left: 22px; display: grid; gap: 6px; }
.mont-lista li { cursor: pointer; padding: 6px 10px; border-radius: 10px; color: var(--suave); }
.mont-lista li.feito { color: var(--texto); }
.mont-lista li.atual { background: rgba(201, 164, 73, .12); color: var(--texto); }
.estagios { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.estagios a { display: grid; place-items: center; width: 58px; padding: 8px 0; border-radius: 14px; background: var(--vidro); border: 1px solid var(--linha); color: var(--texto); text-decoration: none; line-height: 1.1; }
.estagios a b { font-size: 1.2rem; }
.estagios a small { color: var(--apagado); font-size: .7rem; }
.estagios a.ativo { background: linear-gradient(135deg, var(--ouro-claro), var(--ouro)); color: #1a1405; }
.estagios a.ativo small { color: #4a3a10; }
.grade-codigo { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(320px, 1fr); gap: 22px; align-items: start; }
.demo-codigo { position: sticky; top: 124px; }
.demo-codigo .cel-lugar { max-width: 340px; margin: 0 auto 10px; height: 560px; }

.exercicios { list-style: none; padding: 0; display: grid; gap: 16px; }
.exercicio { padding: 20px; border-radius: 14px; background: rgba(0, 0, 0, .18); border: 1px solid var(--linha); }
.exercicio__topo { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.exercicio__topo h3 { margin: 0; font-size: 1.1rem; }
.nivel { font: 700 .7rem var(--f-ui); letter-spacing: .1em; text-transform: uppercase; padding: 5px 10px; border-radius: 99px; background: rgba(52, 211, 153, .15); color: var(--verde); }
.nivel--aplicação { background: rgba(251, 191, 36, .15); color: var(--ambar); }
.nivel--desafio { background: rgba(248, 113, 113, .15); color: var(--vermelho); }
.dica, .gabarito { margin-top: 10px; padding: 10px 14px; border-radius: 10px; background: rgba(255, 255, 255, .03); border: 1px solid var(--linha); }
.dica summary, .gabarito summary { cursor: pointer; font-weight: 700; color: var(--ouro-claro); }
.gabarito summary { color: var(--verde); }
.questoes > li { margin-bottom: 14px; }
.questoes ol li.certa { color: var(--verde); font-weight: 700; }
.porque { color: var(--suave); font-size: .9rem; }

@media (max-width: 980px) {
  .plano, .grade-circ, .grade-codigo { grid-template-columns: 1fr; }
  .plano-indice, .demo-codigo { position: static; max-height: none; }
  .momento__topo { grid-template-columns: 1fr; }
  .abas { top: 57px; }
}

@media print {
  .barra, .abas, .rodape, .acoes, .fundo, .avisos, .aula-capa .chips, .voltar, .dica { display: none !important; }
  body { background: #fff; color: #111; font-size: 11pt; }
  .vidro, .exercicio { background: #fff; border-color: #ccc; backdrop-filter: none; }
  .manchete, .titulo-bloco, h2, h3 { color: #111; }
  .gabarito, .porque { display: none; }
  .questoes ol li.certa { color: #111; font-weight: 400; }
  .imprimir-gabarito .gabarito, .imprimir-gabarito .porque { display: block; }
  .imprimir-gabarito .questoes ol li.certa { font-weight: 700; }
  details > *:not(summary) { display: block !important; }
  details summary { color: #111 !important; }
  code, pre.cod, .kc { color: #111 !important; background: #f4f4f4 !important; }
  .exercicio { break-inside: avoid; }
}
.plano > *, .grade-circ > *, .grade-codigo > *, .grade-2 > * { min-width: 0; }
.texto code, .exercicio code { overflow-wrap: anywhere; }
.texto .tabela code { overflow-wrap: normal; }

/* ---------- turmas e alunos ---------- */
.centro { text-align: center; }
.campo select { width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--linha); background: #0d1a2e; color: var(--texto); font: 1rem var(--f-ui); }
.campo-codigo { text-transform: uppercase; letter-spacing: .3em; font-family: var(--f-cod) !important; font-weight: 700; }
.saudacao--linha { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap; }
.grade-turmas { display: grid; grid-template-columns: 1.4fr 1fr; gap: 22px; align-items: start; }
.grade-turmas > section { display: grid; gap: 12px; }
.cartao-turma { display: grid; grid-template-columns: auto 1fr auto; gap: 18px; align-items: center; padding: 18px 20px; text-decoration: none; color: var(--texto); transition: border-color .2s, transform .2s; }
.cartao-turma:hover { border-color: var(--ouro); transform: translateY(-2px); }
.cartao-turma b { display: block; font-size: 1.08rem; }
.cartao-turma small { display: block; color: var(--suave); font-size: .82rem; }
.cartao-turma .seta { color: var(--ouro-claro); font-size: 1.3rem; }
.codigo-turma { font: 700 1.05rem var(--f-cod); letter-spacing: .14em; padding: 10px 12px; border-radius: 12px; background: rgba(45, 212, 191, .12); color: #99f6e4; }
.codigo-grande { display: grid; justify-items: center; gap: 6px; padding: 16px 26px; }
.codigo-grande small { color: var(--suave); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; }
.codigo-grande b { font: 800 2.2rem var(--f-cod); letter-spacing: .22em; color: var(--ouro-claro); }
.caixas { border: 1px solid var(--linha); border-radius: 12px; padding: 12px 14px; margin: 0 0 14px; display: grid; gap: 8px; }
.caixas legend { font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--suave); padding: 0 6px; }
.caixas label { display: flex; gap: 10px; align-items: center; cursor: pointer; }
.grade-turma { display: grid; grid-template-columns: 1.6fr 1fr; gap: 22px; align-items: start; }
.grade-turma > * { min-width: 0; }
.busca { padding: 10px 14px; border-radius: 99px; border: 1px solid var(--linha); background: rgba(0, 0, 0, .25); color: var(--texto); font: .9rem var(--f-ui); min-width: 240px; }
.alunos { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.aluno { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: start; padding: 14px 16px; border-radius: 14px; background: rgba(0, 0, 0, .18); border: 1px solid var(--linha); }
.aluno--inativo { opacity: .6; }
.aluno__dados b { display: block; }
.aluno__dados small { display: block; color: var(--suave); font-size: .82rem; }
.aluno__acoes { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; align-items: flex-start; }
.aluno__acoes form { margin: 0; }
.editar summary { list-style: none; }
.editar summary::-webkit-details-marker { display: none; }
.editar[open] { flex-basis: 100%; }
.form-editar { margin-top: 12px; padding: 14px; border-radius: 12px; background: rgba(0, 0, 0, .25); }
.selo-ok { color: var(--verde); font-weight: 700; }
.selo-off { color: var(--vermelho); font-weight: 700; }
.perigo { color: var(--vermelho) !important; }
.vazio { color: var(--suave); }
@media (max-width: 900px) { .grade-turmas, .grade-turma, .aluno { grid-template-columns: 1fr; } .aluno__acoes { justify-content: flex-start; } }

/* material do aluno: sem seleção para copiar */
.protegido main { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
.protegido main input, .protegido main textarea { -webkit-user-select: text; user-select: text; }
.pergunte details { margin-top: 8px; }
.pergunte summary { cursor: pointer; color: #a5b4fc; font-weight: 700; }
.pergunte details p { margin: 6px 0 0; }