body {
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, #ffffff, #f7f7f7);
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header com largura máxima */
header {
  background: #fff;
  border-bottom: 1px solid #ddd;
  padding: 1rem 2rem;
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header .logo {
  font-weight: bold;
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: #0066cc;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  font-size: clamp(0.9rem, 1.5vw, 1.2rem);
}

nav a:hover {
  color: #0066cc;
}

/* Social menu */
.social-menu {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 1rem;
}

.social-menu a {
  font-size: 1.5rem;
  color: #333;
  transition: color 0.3s;
}

.social-menu a:hover {
  color: #0066cc;
}

/* Error code */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
}

main h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  color: #cc0000;
  margin-bottom: 1rem;
}

main p {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: #555;
}

#lenine {
  font-weight: bold;
  background: linear-gradient(90deg, #0066cc, #00ccff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}