:root {
    --azul: #061a35;
    --azul-claro: #102d51;
    --ciano: #31d5d2;
    --verde: #55e39e;
    --violeta: #5c23ef;
    --texto: #eef4ff;
    --suave: #b8c6da;
    --erro: #ff8390;
    --linha: rgba(255, 255, 255, .16);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { min-width: 320px; min-height: 100vh; margin: 0; overflow-x: hidden; color: var(--texto); background: linear-gradient(rgba(4, 18, 42, .67), rgba(4, 18, 42, .84)), url('background.png') center / cover fixed; font-family: Arial, Helvetica, sans-serif; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
.cabecalho-aprendizado { position: sticky; top: 0; z-index: 20; min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 12px max(24px, calc((100vw - 1280px) / 2)); border-bottom: 1px solid var(--linha); background: rgba(4, 18, 42, .92); backdrop-filter: blur(14px); }
.marca-aprendizado { display: flex; align-items: center; gap: 12px; color: white; text-decoration: none; font-size: 20px; }
.marca-aprendizado span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 12px; color: #062034; background: linear-gradient(135deg, var(--ciano), var(--verde)); font-size: 23px; }
.progresso-aprendizado { color: var(--suave); font-weight: bold; font-variant-numeric: tabular-nums; }
#aprendizado { width: min(1280px, calc(100% - 40px)); min-height: calc(100vh - 142px); margin: 0 auto; display: grid; place-items: center; padding: 34px 0; }
.tela-aprendizado { width: 100%; animation: entrada .3s ease-out; }
@keyframes entrada { from { opacity: 0; transform: translateY(8px); } }
.capa-aprendizado { width: min(1100px, 100%); margin: auto; text-align: center; }
.capa-aprendizado img { display: block; width: 100%; max-height: 68vh; object-fit: contain; border-radius: 22px; box-shadow: 0 28px 70px rgba(0, 0, 0, .38); }
.botao-principal, .botao-secundario { min-height: 54px; border: 0; border-radius: 12px; padding: 14px 28px; cursor: pointer; font-weight: bold; }
.botao-principal { color: #062034; background: linear-gradient(135deg, var(--ciano), var(--verde)); }
.botao-secundario { color: white; border: 1px solid var(--linha); background: rgba(255, 255, 255, .09); }
.capa-aprendizado .botao-principal { width: min(430px, 100%); margin-top: 24px; font-size: 20px; }
.cartao-introducao, .cartao-questao, .cartao-final { width: min(1160px, 100%); margin: auto; border: 1px solid var(--linha); border-radius: 24px; background: linear-gradient(145deg, rgba(16, 45, 81, .96), rgba(6, 25, 52, .96)); box-shadow: 0 28px 70px rgba(0, 0, 0, .34); }
.cartao-introducao { min-height: 560px; display: grid; place-items: center; padding: clamp(30px, 6vw, 80px); text-align: center; }
.cartao-introducao h1 { max-width: 920px; margin: 0 0 22px; font-size: clamp(34px, 5vw, 62px); line-height: 1.12; }
.cartao-introducao p { max-width: 900px; margin: 0 0 34px; color: var(--suave); font-size: clamp(19px, 2.4vw, 28px); line-height: 1.55; }
.destaque-introducao { color: var(--ciano); }
.cabecalho-questao { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.etapa { color: var(--ciano); font-size: 14px; font-weight: bold; letter-spacing: .15em; }
.cronometro { min-width: 126px; padding: 13px 17px; border-radius: 12px; color: #122035; background: white; box-shadow: 0 10px 30px rgba(0, 0, 0, .28); text-align: center; font-size: 32px; font-variant-numeric: tabular-nums; }
.cartao-questao { padding: clamp(28px, 5vw, 64px); border-bottom: 12px solid var(--violeta); }
.cartao-questao h1 { margin: 0 0 34px; color: white; font-size: clamp(26px, 3.5vw, 43px); line-height: 1.24; }
.alternativas { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.alternativa { min-height: 76px; display: flex; align-items: center; gap: 14px; width: 100%; padding: 16px 18px; border: 1px solid #d9dde5; border-radius: 10px; background: #f7f8fa; color: #18212f; cursor: pointer; text-align: left; font-size: clamp(17px, 1.8vw, 23px); line-height: 1.35; }
.alternativa:hover, .alternativa:focus-visible { border-color: var(--ciano); outline: 3px solid rgba(49, 213, 210, .22); }
.alternativa-correta { border-color: #1e9d65; background: #dff8eb; }
.alternativa-errada { border-color: #d84655; background: #ffe5e8; }
.alternativa:disabled { cursor: default; opacity: 1; }
.letra { flex: 0 0 34px; height: 34px; display: grid; place-items: center; border: 1px solid #aeb7c5; border-radius: 8px; font-weight: bold; }
.retorno { min-height: 62px; margin-top: 22px; padding: 15px 18px; border-radius: 11px; color: white; font-size: 17px; line-height: 1.45; }
.retorno:empty { display: none; }
.retorno-correto { border: 1px solid rgba(85, 227, 158, .55); background: rgba(33, 154, 101, .24); }
.retorno-errado { border: 1px solid rgba(255, 131, 144, .6); background: rgba(184, 48, 66, .22); }
.acoes { display: flex; justify-content: flex-end; gap: 12px; margin-top: 22px; }
.frase-arrastar { color: white; font-size: clamp(21px, 2.6vw, 32px); line-height: 2.2; }
.espaco-palavra { min-width: 135px; min-height: 48px; display: inline-flex; align-items: center; justify-content: center; margin: 0 6px; padding: 4px 10px; border: 2px dashed #8e98a7; border-radius: 8px; vertical-align: middle; background: white; color: #172337; }
.espaco-palavra:empty::after { content: 'toque aqui'; color: #9aa3b0; font-size: 13px; }
.banco-palavras { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 34px; padding-top: 28px; border-top: 1px solid var(--linha); }
.palavra { padding: 12px 15px; border: 1px solid #d9dde5; border-radius: 9px; color: #172337; background: #f7f8fa; cursor: grab; font-size: 18px; }
.palavra-selecionada { outline: 4px solid rgba(49, 213, 210, .55); }
.cartao-final { padding: clamp(38px, 7vw, 88px); text-align: center; }
.icone-final { width: 88px; height: 88px; display: grid; place-items: center; margin: 0 auto 24px; border-radius: 50%; color: #062034; background: linear-gradient(135deg, #ffd86b, var(--verde)); font-size: 42px; }
.cartao-final h1 { margin: 0 0 20px; font-size: clamp(40px, 7vw, 78px); }
.cartao-final p { max-width: 820px; margin: 0 auto 32px; color: var(--suave); font-size: clamp(18px, 2.2vw, 25px); line-height: 1.55; }
.cartao-final .botao-principal { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; font-size: 19px; }
footer { min-height: 66px; display: grid; place-items: center; padding: 18px; border-top: 1px solid var(--linha); color: #8fa0b8; font-size: 13px; text-align: center; }
@media (max-width: 760px) {
    body { background-attachment: scroll; }
    .cabecalho-aprendizado { min-height: 68px; padding: 10px 14px; }
    .marca-aprendizado { font-size: 17px; }
    .marca-aprendizado span { width: 38px; height: 38px; }
    .progresso-aprendizado { font-size: 14px; }
    #aprendizado { width: calc(100% - 20px); min-height: calc(100vh - 124px); padding: 18px 0 28px; }
    .capa-aprendizado img { border-radius: 14px; }
    .cartao-introducao { min-height: calc(100vh - 150px); padding: 30px 20px; border-radius: 17px; }
    .cartao-introducao h1 { font-size: clamp(30px, 9vw, 44px); }
    .cartao-introducao p { font-size: 19px; }
    .cabecalho-questao { position: sticky; top: 78px; z-index: 10; align-items: center; }
    .cronometro { min-width: 108px; padding: 12px; font-size: 27px; }
    .cartao-questao { padding: 24px 16px; border-radius: 16px; }
    .cartao-questao h1 { margin-bottom: 24px; font-size: 25px; }
    .alternativas { grid-template-columns: 1fr; gap: 11px; }
    .alternativa { min-height: 66px; padding: 14px; font-size: 18px; }
    .retorno { font-size: 16px; }
    .acoes { flex-direction: column-reverse; }
    .acoes button { width: 100%; }
    .frase-arrastar { font-size: 20px; line-height: 2.5; }
    .espaco-palavra { min-width: 120px; margin: 4px; }
    .palavra { font-size: 17px; }
    .cartao-final { padding: 40px 22px; }
}