body {
  margin: 0;
  background: #f9f9f9;
  color: #222;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 60px;
  background: white;
  display: flex;
  align-items: center;
  padding: 0 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
  z-index: 10;
}

.back-button {
  font-size: 17px;
  text-decoration: none;
  color: #333;
  display: inline-block;
  margin-bottom: 12px;
  transition: color 0.2s;
  border-radius: 2px;
}

.back-button:hover {
  color: #3182F6;
}

#back-btn:hover {
  background-color: #e6f0ff;
}

#blog-detail-container {
  max-width: 720px;
  margin: 80px auto 40px;
  background: white;
  border-radius: 16px;
  padding: 40px 50px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  line-height: 1.6;
  font-size: 1.15rem;
}

#blog-detail-container h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: #222;
}

#blog-detail-container article {
  color: #444;
}

@media (max-width: 768px) {
  #blog-detail-container {
    margin: 80px 20px 40px;
    padding: 30px 20px;
  }
}