/* Reset básico e fonte */
body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f6f8;
  /* cinza claro da página inicial */
  color: #3b2f2f;
  /* texto escuro mas próximo do marrom para Java */
}

/* Header com degradê laranja (similar ao azul da página inicial) */
header {
  background: linear-gradient(135deg, #e07b39, #b54f23);
  /* laranja quente degradê */
  color: #fdf6f0;
  padding: 40px 20px;
  text-align: center;
  box-shadow: 0 4px 10px rgba(224, 123, 57, 0.4);
}

header h1 {
  font-size: 3rem;
  margin-bottom: 15px;
  font-weight: 700;
}

/* Navegação */
nav {
  margin-top: 20px;
}

nav a.btn {
  background-color: #b54f23;
  color: #fdf6f0;
  padding: 12px 24px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  box-shadow: 0 3px 8px rgba(181, 79, 35, 0.5);
  transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
  display: inline-block;
}

nav a.btn:hover,
nav a.btn:focus {
  background-color: #8a3e1b;
  transform: scale(1.05);
  box-shadow: 0 5px 15px rgba(138, 62, 27, 0.7);
  outline: none;
}

/* Main container centralizado com max-width igual à página inicial */
main {
  max-width: 900px;
  margin: 30px auto 60px auto;
  padding: 0 20px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(59, 47, 47, 0.1);
}

/* Sections com espaçamento e borda sutil */
section {
  margin-bottom: 40px;
  padding-bottom: 10px;
  border-bottom: 1px solid #f0e6d8;
}

section:last-child {
  border-bottom: none;
}

section h2 {
  color: #b54f23;
  /* cor laranja escura */
  font-size: 2rem;
  margin-bottom: 15px;
  border-bottom: 2px solid #e07b39;
  padding-bottom: 6px;
  font-weight: 700;
}

/* Listas com recuo */
ul {
  padding-left: 24px;
}

ul li {
  margin-bottom: 10px;
  line-height: 1.7;
  font-size: 1.1rem;
  color: #4b3b2f;
}

/* Código formatado com fundo bege suave e borda esquerda */
pre {
  background-color: #fff8f0;
  color: #3b2f2f;
  padding: 20px;
  border-left: 5px solid #e07b39;
  border-radius: 8px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 1rem;
  overflow-x: auto;
  box-shadow: 0 3px 8px rgba(224, 123, 57, 0.15);
  line-height: 1.5;
}

code {
  background: none;
  color: inherit;
}

/* Extra materials centralizado com botões laranja */
.material-complementar {
  text-align: center;
  margin-top: 50px;
}

.material-complementar h3 {
  margin-bottom: 25px;
  color: #7a4b24;
  font-weight: 700;
  font-size: 1.5rem;
}

/* Botões no estilo da página inicial, mas com cores laranja */
.button-group {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.button-group .btn {
  background-color: #b54f23;
  color: #fdf6f0;
  padding: 14px 28px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(181, 79, 35, 0.5);
  transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
  user-select: none;
}

.button-group .btn:hover,
.button-group .btn:focus {
  background-color: #8a3e1b;
  transform: scale(1.06);
  box-shadow: 0 6px 18px rgba(138, 62, 27, 0.7);
  outline: none;
}

/* Footer com mesma sombra e padding da página inicial */
footer {
  background-color: #6a4e42;
  color: #fdf6f0;
  text-align: center;
  padding: 15px 10px;
  font-size: 0.9rem;
  box-shadow: 0 -4px 8px rgba(106, 78, 66, 0.7);
}