:root {
  /* Tema geral */
  --cor-fundo: #f0f6ff;
  --cor-fundo-card: #ffffff;
  --cor-primaria: #2563eb;
  --cor-secundaria: #60a5fa;
  --cor-texto: #1e293b;
  --cor-texto-suave: #64748b;
  --cor-sucesso: #10b981;
  --cor-erro: #ef4444;
  --raio-borda: 12px;
  --fonte-principal: 'Segoe UI', system-ui, sans-serif;

  /* Paleta editor matemático */
  --ed-fundo-caderno: #f0f6ff;
  --ed-btn-num:        #dbeafe;
  --ed-btn-num-hover:  #bfdbfe;
  --ed-btn-op:         #fed7aa;
  --ed-btn-op-hover:   #fdba74;
  --ed-btn-esp:        #d1fae5;
  --ed-btn-esp-hover:  #a7f3d0;
  --ed-btn-verificar:  #2563eb;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--cor-fundo);
  color: var(--cor-texto);
  font-family: var(--fonte-principal);
  min-height: 100vh;
}

a {
  color: var(--cor-primaria);
  text-decoration: none;
}

main {
  padding: 2rem;
  max-width: 1600px;
  margin: 0 auto;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
}