body {
  margin: 0;
  font-family: "Inter", sans-serif;
  background-color: #0d0070;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

/* Página de login */
.login-container {
  background-color: #05002b;
  padding: 40px;
  border-radius: 12px;
  text-align: center;
  width: 340px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.4);
}

.logo {
  width: 160px;
  margin-bottom: 20px;
}

input {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
}

button {
  width: 100%;
  background: #00b7ff;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #00d0ff;
}

p {
  margin-top: 15px;
  color: #b3b3ff;
  font-size: 0.9rem;
}

/* Página de aulas */
.sidebar {
  width: 280px;
  background-color: #05002b;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.top-section {
  flex-grow: 1;
}

h2 {
  font-size: 1rem;
  text-transform: uppercase;
  color: #b3b3ff;
  margin-bottom: 10px;
}

ul {
  list-style: none;
  padding: 0;
  margin-bottom: 20px;
}

li {
  margin: 8px 0;
}

a {
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  transition: background 0.3s;
}

a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

iframe {
  width: 100%;
  height: 480px;
  border-radius: 10px;
  border: none;
  background: #000;
}

.logout-btn {
  background: #ff3b3b;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  width: 100%;
  font-weight: 500;
  transition: background 0.3s;
}

.logout-btn:hover {
  background: #ff6262;
}