body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f2f2f7;
  margin: 0;
  padding: 16px;
  color: #1c1c1e;
}
.container {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}
.card {
  background: #fff;
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.08);
}
h1, h2 {
  margin-top: 0;
}
h1 {
  font-size: 26px;
  text-align: center;
  margin-bottom: 16px;
}
h2 {
  font-size: 21px;
  margin-bottom: 14px;
}
.top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.full {
  grid-column: 1 / -1;
}
label {
  display: block;
  font-size: 14px;
  margin-bottom: 6px;
  color: #444;
}
input, select, button {
  width: 100%;
  border-radius: 12px;
  border: 1px solid #d1d1d6;
  padding: 12px;
  font-size: 16px;
  background: white;
  box-sizing: border-box;
  min-height: 46px;
}
.aluno-card {
  border: 1px solid #e5e5ea;
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 12px;
  background: #fafafa;
}
.aluno-card:last-child {
  margin-bottom: 0;
}
.nome {
  font-size: 17px;
  line-height: 1.35;
  margin-bottom: 10px;
}
.nome small {
  color: #666;
  display: block;
  margin-top: 4px;
}
.campo-status {
  margin-bottom: 10px;
}
.acoes-linha {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.botoes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 18px;
}
button {
  color: white;
  border: none;
  font-weight: 600;
  cursor: pointer;
}
#btnNovoAluno,
#btnCadastrarAluno {
  background: #34c759;
}
#btnCancelarCadastro {
  background: #8e8e93;
}
#btnSalvarChamada {
  background: #007aff;
}
.btn-editar {
  background: #ff9f0a;
}
.btn-excluir {
  background: #ff3b30;
}
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.msg {
  margin-top: 16px;
  font-size: 15px;
  text-align: center;
  line-height: 1.4;
  white-space: pre-line;
}
.subtle {
  color: #666;
  font-size: 13px;
  margin-top: -8px;
  margin-bottom: 12px;
}
.loading {
  text-align: center;
  color: #666;
  padding: 8px 0;
}
@media (min-width: 768px) {
  body {
    padding: 20px;
  }
  .card {
    padding: 18px;
  }
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
  .botoes {
    grid-template-columns: 1fr 1fr;
  }
}