:root {
  --primary: #00cfff;
  --dark-blue: #001a33;
  --light: #f4f9ff;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: 'Poppins', sans-serif;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
  background-color: #000; /* fundo escuro padrão */
}

body::before {
  display: none; /* sem máscara branca */
}

#video-fundo-login {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  z-index: -3;
  opacity: 0.3;
  pointer-events: none;
}

header {
  background-color: var(--dark-blue);
  color: #fff;
  padding: 1rem;
  text-align: center;
  z-index: 1;
}

main {
  max-width: 420px;
  margin: 5rem auto;
  background-color: #0F1A2B; /* caixa escura */
  padding: 2.5rem;
  border-radius: 1rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  text-align: center;
  color: white;
  z-index: 1;
}

main h1 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

main p {
  font-size: 1.2rem;
  color: #aaa;
  margin-bottom: 2rem;
}

.btn {
  font-size: 1.2rem;
  padding: 0.75rem 2rem;
  border-radius: 0.75rem;
  background-color: var(--primary);
  color: white;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn i {
  margin-right: 0.5rem;
}

.btn:hover {
  background-color: #00a5d6;
}

footer {
  background-color: var(--dark-blue);
  color: white;
  padding: 1rem;
  text-align: center;
  margin-top: auto;
  z-index: 1;
}