body {
  font-family: Arial, sans-serif;
  background: #0b0c10;
  color: #fff;
  margin: 0;
  padding: 0;
}
.container {
  max-width: 600px;
  margin: auto;
  padding: 20px;
}
img.header-logo {
  display: block;
  max-width: 70%;
  margin: 0 auto 20px;
}
nav {
  text-align: center;
  margin-bottom: 20px;
}
nav a {
  display: inline-block;
  margin: 8px;
  color: #1f8ef1;
  text-decoration: none;
  font-size: 1rem;
}
h1, h2 {
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 15px;
}
.card {
  background: #1a1c22;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
}
input, button, textarea {
  width: 100%;
  padding: 14px;
  margin: 10px 0;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  box-sizing: border-box;
}
button {
  background: #1f8ef1;
  color: white;
  cursor: pointer;
}
button:hover {
  background: #0d6efd;
}
.footer {
  text-align: center;
  margin-top: 25px;
  font-size: 0.85rem;
  color: #aaa;
}