:root {
    --bg-start:  #00039e;
    --bg-end: #04052e;
    --primary: #a7c6f4;
    --teoria: #01337e;
    --exercicio: #02380f;
    --destaque: #ffff3b;
    --accent: #553394;
    --projeto: #5ebede;
    --texto: #ffffff;
    --texto-reverso: #040131;
    --card: rgb(2, 65, 168);
    --borda: rgb(20, 30, 44);
    --glow: rgba(34, 211, 238, 0.4);
}

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

body {
  /* font-family: 'Roboto', sans-serif; */
  font-family: "Saira", sans-serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
  font-size: large;
  background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  background-attachment: fixed;
  transition: padding-left 0.4s ease;
}
/* ========== Camada superior com icone e botão ========== */
.logo {
  z-index: 1;
  position: fixed;
  top: 10px;
  right: 20px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
}
.logo img{
  border: var(--glow) solid 2px;
  border-radius: 50%;
  width: 60px;
  height: 60px;
}
.logo button{
  border: var(--primary) solid 2px;
  border-radius: 25px;
  background: var(--bg-start);
  color: var(--texto);
  font-size: 14px;
  height: 2rem;
  padding: 6px 20px;
}
/* ========== Card de aula (menu de aulas) ========== */
/* Container */
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: 2rem;
  margin: 1rem 3rem;
  font-family: 'Orbitron', sans-serif;
  border-radius: 25px;
}
.card {
  background: var(--bg-start);
  color: var(--text);
  border: var(--primary) solid 2px;
  border-radius: 20px;
  position: relative;
  padding: 1rem;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 0 1rem 0 var(--glow);
}
.card-header {
  border: var(--primary) solid 1px;
  border-radius: 20px;
  font-size: 1.5rem;
  font-weight: 500;
  background: var(--card);
  color: var(--texto);
  padding: 0.5rem;
}
.card-input {
  padding: 0.5rem;
  border: var(--primary) solid 1px;
  border-radius: 20px;
  font-size: 1rem;
  padding: 0.5rem;
}
.card-mensagem {
  font-size: 1rem;
  padding: 0.5rem;
  color: var(--destaque);
}
.card-rodape {
  padding: 0.5rem;
}
.card-rodape button {
  font-family: 'Orbitron', sans-serif;
  border: var(--primary) solid 1px;
  border-radius: 15px;
  background: var(--bg-start);
  color: var(--texto);
  font-size: medium;
  padding: 0.5rem;
}
.card-rodape button:hover {
  background: var(--primary);
  color: var(--bg-start);
}
.card-rodape button:active {
  background: var(--accent);
  color: var(--bg-start);
}