/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Estilo geral */
body.fundo-pagina {
  background-color: #1a1a1a;
  font-family: 'Playfair Display', serif;
  margin: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  color: #ffffff;
}

/* Cabeçalho */
header {
  background-color: #0d08a6;
  padding: 1.5rem 2rem;
  color: #ecf0f1;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav ul li a {
  color: #ecf0f1;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.25s ease-in-out;
}

nav ul li a:hover,
nav ul li a:focus {
  color: #0d08a6;
  outline: none;
}

/* Main content */
main {
  max-width: 900px;
  width: 90%;
  margin: 2rem auto;
  flex-grow: 1;
}

/* Seções */
section {
  background-color: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  margin-bottom: 2rem;
}

section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

/* Botões gerais */
button {
  background-color: #0d08a6;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover,
button:focus {
  background-color: #0d08a6;
  outline: none;
}

/* Botão buscar alunos */
#buscarAlunos {
  font-size: 1.1rem;
}

/* Lista de alunos */
ul#listaAlunos {
  list-style: disc inside;
  margin-top: 1rem;
  color: #34495e;
  font-weight: 600;
}

ul#listaAlunos li {
  padding: 0.3rem 0;
  border-bottom: 1px solid #ddd;
}

/* Formulário */
form label {
  display: block;
  margin-top: 1rem;
  font-weight: 600;
  color: #2c3e50;
}

form input[type="email"],
form input[type="text"],
form textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  margin-top: 0.25rem;
  border: 1.5px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s ease;
  resize: vertical;
}

form input[type="email"]:focus,
form input[type="text"]:focus,
form textarea:focus {
  border-color: #0d08a6;
  outline: none;
}

/* Textarea específica */
textarea#mensagem {
  min-height: 120px;
}

/* Footer */
footer {
  background-color: #0d08a6;
  color: #ecf0f1;
  text-align: center;
  padding: 1.25rem 2rem;
  position: relative;
  font-size: 0.9rem;
  user-select: none;
}

/* Botão voltar - canto superior direito */
.botao-lobby-redondo {
  position: flex;
  top: 1rem;
  right: 1rem;
  background-color: #0d08a6;
  border-radius: 50%;
  border: none;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 1000; 
  transition: background-color 0.3s ease;
}

.botao-lobby-redondo:hover,
.botao-lobby-redondo:focus {
  background-color: #120af4;
  outline: none;
}

.botao-lobby-redondo img.icone-lobby {
  width: 26px;
  height: 26px;
}

.botao-lobby-redondo {
  position: absolute;
  left: 1.5rem;
  top: 20%;
  transform: translateY(-20%);
  background-color: #0d08a6;
  border-radius: 50%;
  border: none;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

@media (max-width: 767px) {
  .botao-lobby-redondo {
    position: fixed;
    top: 1rem;
    right: 1rem;
    left: auto;
    transform: none;
    z-index: 1000;
  }
}

/* Responsividade */

@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
    gap: 1rem;
  }
  main {
    width: 95%;
  }
  .botao-lobby-redondo {
    position: static;
    transform: none;
    margin-bottom: 1rem;
  }
}