* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: #f7f7f7;
  color: #333;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  background: #4b3e32;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-link {
  padding: 10px 18px;
  border-radius: 4px;
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: #debb69;
  text-decoration: underline;
}

@media (max-width: 520px) {
  .navbar {
    gap: 15px;
    justify-content: flex-start;
    overflow-x: auto;
    padding: 0 10px;
  }

  .nav-link {
    flex: 0 0 auto;
    padding: 8px 12px;
    font-size: 13px;
  }
}