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

body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

/* 404 image */
img {
  width: 100%;
  max-width: 550px;
  margin-bottom: 1.5rem;
}

/* heading */
h1 { font-size: 2rem; margin-bottom: 1rem; }

/* description */
p {
  font-size: 1rem;
  color: #f3e8ff;
  margin-bottom: 2rem;
}

/* button */
a {
  background: #fff;
  color: #667eea;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  transition: all 0.3s;
}

a:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
}

/* responsive */
@media (max-width: 600px) {
  img { max-width: 400px; }
  h1 { font-size: 1.5rem; }
  p { font-size: 0.9rem; }
}