/* Amplianismo exemplificado: a aula no quadro branco. Caneta preta, azul e vermelha. */
:root {
  --lousa: #FCFCFA;
  --moldura: #C7CBD0;
  --giz: #1E2227;
  --giz-suave: #6A7078;
  --giz-amarelo: #1F5FBF;
  --giz-vermelho: #D3302A;
  --mao: 'Caveat', 'Comic Sans MS', cursive;
}

.pagina-lousa { background: #E6E7E3; }
.lousa { padding: 48px 24px; background: #E6E7E3; }
.lousa + .lousa { padding-top: 0; }
.quadro {
  position: relative; max-width: 1040px; margin: 0 auto; padding: 48px 44px 56px;
  color: var(--giz); border: 10px solid var(--moldura); border-radius: 8px;
  background:
    linear-gradient(115deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.9) 18%, rgba(255,255,255,0) 32%),
    linear-gradient(115deg, rgba(0,0,0,0) 55%, rgba(0,0,0,0.018) 70%, rgba(0,0,0,0) 85%),
    var(--lousa);
  box-shadow: inset 0 0 0 2px #E9EBED, inset 0 0 40px rgba(0,0,0,0.04), 0 16px 34px rgba(0,0,0,0.16);
}
.quadro::after { content: ""; position: absolute; left: 8%; right: 8%; bottom: -22px; height: 9px; border-radius: 0 0 4px 4px;
  background:
    linear-gradient(90deg, transparent 0 62%, #1E2227 62% 66%, transparent 66% 68%, #1F5FBF 68% 72%, transparent 72% 74%, #D3302A 74% 78%, transparent 78%) top / 100% 5px no-repeat,
    linear-gradient(#D5D8DC, #B9BDC2);
  box-shadow: 0 6px 10px rgba(0,0,0,0.18); }

.giz, .giz-grande, .giz-titulo, .giz-destaque, .giz-sub, .quadro h3, .cartao-giz p, .cena p, .tres-perguntas p {
  font-family: var(--mao); color: var(--giz);
}
.giz-rotulo { margin: 0 0 10px; font-family: var(--titulo); font-weight: 600; font-size: 12px; letter-spacing: 0.26em; text-transform: uppercase; color: var(--giz-suave); }
.giz-titulo { margin: 0 0 24px; font-weight: 700; font-size: clamp(34px, 4.6vw, 52px); line-height: 1.05; }
.giz-titulo-grande { font-size: clamp(38px, 5.6vw, 64px); }
.giz { margin: 0 0 16px; font-size: clamp(21px, 2.3vw, 25px); line-height: 1.35; }
.giz-grande { margin: 0 0 14px; font-weight: 600; font-size: clamp(27px, 3.2vw, 36px); line-height: 1.15; }
.giz-destaque { margin: 28px 0 16px; font-weight: 700; font-size: clamp(28px, 3.6vw, 42px); line-height: 1.15; }
.giz-sub { margin: 0 0 12px; font-weight: 700; font-size: clamp(25px, 2.6vw, 30px); }
.amarelo { color: var(--giz-amarelo); }
.vermelho-giz { color: var(--giz-vermelho); }
.chave { color: var(--giz-amarelo); font-weight: 700; }
.quadro em { font-style: italic; }

/* Desenhos a giz */
.desenho { width: 100%; max-width: 380px; height: auto; }
.traco, .traco * { fill: none; stroke: var(--giz); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.traco { filter: url(#giz); }
.traco .vermelho, .traco.vermelho { stroke: var(--giz-vermelho); }
.traco .amarelo-traco, .traco.amarelo-traco { stroke: var(--giz-amarelo); }
.giz-desenho-texto { font-family: var(--mao); font-weight: 700; font-size: 64px; fill: var(--giz); stroke: none; filter: url(#giz); }
.giz-desenho-texto.pequeno { font-size: 17px; font-weight: 600; }
.vermelho-texto { fill: var(--giz-vermelho); }
.amarelo-texto { fill: var(--giz-amarelo); }

.cena-grande { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 36px; align-items: center; margin: 8px 0 8px; }

/* Régua a giz */
.regua-giz { position: relative; height: 22px; max-width: 420px; margin: 34px 0 30px; opacity: 0.9; filter: url(#giz); }
.regua-giz::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: var(--giz-vermelho); }
.regua-giz::after { content: ""; position: absolute; left: 0; right: 0; top: 3px; height: 18px;
  background: repeating-linear-gradient(90deg, var(--giz-vermelho) 0 3px, transparent 3px 84px) top left / 100% 18px no-repeat,
              repeating-linear-gradient(90deg, var(--giz-vermelho) 0 2px, transparent 2px 21px) top left / 100% 9px no-repeat; }

/* Linha do tempo das filosofias */
.linha-do-tempo { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.cartao-giz { padding: 18px 20px 14px; border: 2px solid rgba(30,34,39,0.55); border-radius: 12px; }
.cartao-giz .quando { margin: 0 0 6px; font-family: var(--titulo); font-weight: 600; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--giz-suave); }
.cartao-giz h3 { margin: 0 0 8px; font-weight: 700; font-size: 30px; line-height: 1.05; }
.cartao-giz p { margin: 0 0 8px; font-size: 21px; line-height: 1.25; }
.cartao-nosso { border: 3px solid var(--giz-vermelho); background: rgba(211,48,42,0.05); }
.cartao-nosso h3 { color: var(--giz-vermelho); }

.dois-lados { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px; }

/* As três perguntas */
.tres-perguntas { list-style: none; padding: 0; margin: 12px 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.tres-perguntas li { text-align: center; }
.icone-giz { width: 120px; height: auto; display: block; margin: 0 auto 6px; }
.tres-perguntas h3 { margin: 0 0 6px; font-weight: 700; font-size: 34px; color: var(--giz-amarelo); }
.tres-perguntas p { margin: 0; font-size: 22px; line-height: 1.3; }

/* Cenas do dia a dia */
.cenas { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; margin-top: 8px; }
.cena { padding: 16px 20px 14px; border: 2px solid rgba(30,34,39,0.55); border-radius: 12px; }
.cena .icone-giz { width: 96px; margin: 0 0 4px; }
.cena h3 { margin: 0 0 6px; font-weight: 700; font-size: 30px; color: var(--giz-amarelo); }
.cena p { margin: 0 0 8px; font-size: 21px; line-height: 1.28; }
.cena .situacao { font-weight: 600; }

.lousa-final .botoes { margin-top: 24px; }
.lousa-final .btn-contorno { color: var(--giz); border-color: var(--giz); }
.lousa-final .em-breve { color: var(--giz-suave); }

/* Quadro branco: ímã, marca-texto e a nota do direito */
.quadro::before { content: ""; position: absolute; top: 16px; right: 20px; width: 20px; height: 20px; border-radius: 50%;
  background: radial-gradient(circle at 35% 32%, #F48A83 0 18%, #D3302A 46%, #A51F1A 100%);
  box-shadow: 0 2px 4px rgba(0,0,0,0.28), inset 0 -2px 2px rgba(0,0,0,0.18); }
.marca-texto { background: linear-gradient(176deg, transparent 0 52%, rgba(31,95,191,0.20) 52% 90%, transparent 90%); padding: 0 2px; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.nota-direito { margin: 26px 0 0; padding-top: 18px; border-top: 2px dashed rgba(30,34,39,0.25); color: var(--giz-suave); }
.cartao-giz .quando, .giz-rotulo { color: #5A6068; }

/* Aula 6: casos para tocar e ver a resposta */
.casos { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 8px; align-items: start; }
.exercicio { border: 2px solid rgba(30,34,39,0.55); border-radius: 12px; background: rgba(255,255,255,0.6); }
.exercicio summary { list-style: none; cursor: pointer; display: block; position: relative; padding: 16px 18px 14px 70px; min-height: 44px; }
.exercicio summary::-webkit-details-marker { display: none; }
.caso-n { position: absolute; left: 18px; top: 16px; width: 38px; height: 38px; display: grid; place-items: center; border: 2.5px solid var(--giz-amarelo); border-radius: 50%; font-family: var(--mao); font-weight: 700; font-size: 26px; line-height: 1; color: var(--giz-amarelo); box-sizing: border-box; }
.caso-texto { display: block; margin-bottom: 6px; font-family: var(--mao); font-weight: 600; font-size: 23px; line-height: 1.25; color: var(--giz); }
.caso-ver { display: block; font-family: var(--titulo); font-weight: 600; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--giz-vermelho); }
.caso-ver::after { content: " +"; }
.exercicio[open] .caso-ver::after { content: " −"; }
.exercicio[open] { border-color: var(--giz-amarelo); background: rgba(31,95,191,0.04); }
.exercicio summary:focus-visible { outline: 3px solid var(--giz-amarelo); outline-offset: 2px; border-radius: 10px; }
.exercicio > p { margin: 0; padding: 0 18px 18px 70px; font-family: var(--mao); font-size: 22px; line-height: 1.3; color: var(--giz); }

/* Para lembrar */
.resposta-bola { margin-bottom: 8px; }
.eu-sou { color: var(--giz-vermelho); font-size: clamp(34px, 4.4vw, 50px); margin-top: 6px; }

@media (max-width: 900px) {
  .cena-grande, .dois-lados { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .tres-perguntas { grid-template-columns: minmax(0, 1fr); gap: 28px; }
}
@media (max-width: 640px) {
  .lousa { padding: 28px 10px; }
  .quadro { border-width: 7px; padding: 30px 18px 36px; }
  .quadro::after { bottom: -17px; height: 7px; }
  .linha-do-tempo, .cenas, .casos { grid-template-columns: minmax(0, 1fr); }
  .quadro::before { top: 10px; right: 12px; width: 16px; height: 16px; }
  .desenho { max-width: 300px; }
}