body {
  background: linear-gradient(135deg, #0b0c10, #1f2833);
  color: #ffffff;
  font-family: 'Montserrat', sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

.content {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  text-align: left;
}

.content p {
  margin-bottom: 1.5rem;
}

.sub-menu {
  display: flex;
  flex-direction: column;
  margin-top: 2rem;
  gap: 0.6rem;
}

.sub-menu a {
  color: #66fcf1;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

.sub-menu a:hover {
  color: #ffffff;
}

footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: #c5c6c7;
}

.main-menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
  gap: 1rem;
}

.main-menu a {
  color: #66fcf1;
  text-decoration: none;
  font-weight: 600;
  background: #1f2833;
  padding: 1rem 1.5rem;
  border-radius: 6px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  transition: background 0.3s, transform 0.2s;
}

.main-menu a:hover {
  background: #45a29e;
  transform: scale(1.02);
}