:root {
  --bg: #f3f1ec;
  --bg-accent: #e7efe9;
  --ink: #15201c;
  --muted: #5c6b64;
  --line: #d5ddd7;
  --card: #fffdf9;
  --brand: #0f4c3a;
  --brand-soft: #d9ebe3;
  --ok: #1f7a4d;
  --ok-bg: #e7f6ee;
  --bad: #a33b32;
  --bad-bg: #fceceb;
  --shadow: 0 18px 50px rgba(21, 32, 28, 0.08);
  --radius: 18px;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
  max-width: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, var(--bg-accent), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, #efe8dc, transparent 55%),
    var(--bg);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

button {
  font: inherit;
  cursor: pointer;
  border: 0;
  background: none;
}

.app {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 1.5rem 1rem 2.5rem;
  padding-left: max(1rem, env(safe-area-inset-left));
  padding-right: max(1rem, env(safe-area-inset-right));
}

.top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.brand {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
  flex: 1;
}

.brand strong {
  font-size: clamp(1.35rem, 4vw, 1.9rem);
  letter-spacing: -0.03em;
  color: var(--brand);
}

.brand span {
  color: var(--muted);
  font-size: 0.9rem;
}

.stats {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

.stat {
  min-width: 64px;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 253, 249, 0.8);
  text-align: center;
}

.stat b {
  display: block;
  font-size: 1.05rem;
  line-height: 1.1;
}

.stat small {
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.35rem;
  max-width: 100%;
  overflow: hidden;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 0.75rem;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.chip.muted {
  background: #eef1ef;
  color: var(--muted);
}

.pergunta {
  margin: 0 0 1.15rem;
  overflow-wrap: anywhere;
  word-break: normal;
  hyphens: none;
}

.pergunta p {
  margin: 0 0 0.75rem;
}

.pergunta p:last-child {
  margin-bottom: 0;
}

.texto-base {
  margin-bottom: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f7faf8;
  max-height: min(42vh, 320px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  font-size: 0.95rem;
  line-height: 1.55;
  color: #24332d;
}

.texto-base .aviso {
  margin-bottom: 0.7rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--brand);
}

.enunciado {
  font-size: clamp(1rem, 2.8vw, 1.2rem);
  letter-spacing: -0.01em;
  line-height: 1.55;
  font-weight: 500;
}

@media (max-width: 640px) {
  .texto-base {
    max-height: min(38vh, 260px);
    padding: 0.8rem;
    font-size: 0.9rem;
  }
}

.opcoes {
  display: grid;
  gap: 0.65rem;
  min-width: 0;
}

.opcao {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-align: left;
  padding: 0.85rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--ink);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.opcao:hover:not(:disabled) {
  border-color: #9eb5aa;
}

.opcao.selecionada {
  border-color: var(--brand);
  background: #f3faf6;
}

.opcao.correta {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.opcao.errada {
  border-color: var(--bad);
  background: var(--bad-bg);
}

.opcao:disabled {
  cursor: default;
}

.opcao .letra {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: #eef3f0;
  color: var(--brand);
  font-size: 0.85rem;
  font-weight: 700;
}

.opcao .texto {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: normal;
  hyphens: none;
}

.opcao.selecionada .letra,
.opcao.correta .letra {
  background: var(--brand);
  color: #fff;
}

.opcao.errada .letra {
  background: var(--bad);
  color: #fff;
}

.acoes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.15rem;
}

.btn {
  padding: 0.85rem 1.2rem;
  border-radius: 12px;
  font-weight: 600;
  transition: opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-ghost {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.feedback {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  font-weight: 600;
  display: none;
  overflow-wrap: anywhere;
}

.feedback.show {
  display: block;
}

.feedback.ok {
  background: var(--ok-bg);
  color: var(--ok);
}

.feedback.bad {
  background: var(--bad-bg);
  color: var(--bad);
}

.explicacao {
  margin-top: 0.85rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f7faf8;
  color: #24332d;
  font-size: 0.95rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.explicacao[hidden] {
  display: none !important;
}

.explicacao p {
  margin: 0 0 0.7rem;
}

.explicacao p:last-child {
  margin-bottom: 0;
}

.estado {
  min-height: 220px;
  display: grid;
  place-items: center;
  color: var(--muted);
  text-align: center;
  gap: 0.5rem;
}

.estado.hidden,
.quiz.hidden {
  display: none;
}

.loader {
  width: 28px;
  height: 28px;
  border: 2px solid var(--line);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 0.5rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.progresso {
  display: none;
}

@media (max-width: 640px) {
  .app {
    padding: 1rem 0.85rem 2rem;
    padding-left: max(0.85rem, env(safe-area-inset-left));
    padding-right: max(0.85rem, env(safe-area-inset-right));
  }

  .top {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.65rem;
  }

  .brand span {
    font-size: 0.82rem;
  }

  .stats {
    gap: 0.35rem;
  }

  .stat {
    min-width: 56px;
    padding: 0.4rem 0.5rem;
  }

  .stat b {
    font-size: 0.95rem;
  }

  .stat small {
    font-size: 0.62rem;
  }

  .panel {
    padding: 1rem;
    border-radius: 16px;
  }

  .enunciado {
    font-size: 1rem;
  }

  .opcao {
    padding: 0.8rem;
    gap: 0.65rem;
  }

  .acoes {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 380px) {
  .top {
    flex-direction: column;
  }

  .stats {
    width: 100%;
  }

  .stat {
    flex: 1;
  }
}