body {
  background: rgba(239,239,239,1);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 64px;
  background: rgba(210, 210, 210, 0.3); /* 更浅的半透明白色 */
  z-index: 1000;
  display: flex;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.navbar ul {
  list-style: none;
  margin: 0;
  padding: 0 64px 0 0;
  display: flex;
  gap: 24px;
  justify-content: flex-end;
  width: 100%;
  transform: translateX(-40px);
}

.navbar li {
  display: flex;
  align-items: center;
}

.navbar a {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #222;
  text-decoration: none;
  font-size: 14px;
  padding: 4px 8px;
  transition: background 0.2s, color 0.2s, opacity 0.2s;
  border-radius: 4px;
}

.navbar a:hover {
  background: #fff;
  color: #222;
  opacity: 0.5;
}

.navbar img {
  width: 60px;
  height: 30px;
  margin-bottom: 4px;
  object-fit: contain;
  display: block;
}

.navbar li:last-child a {
  width: 64px;
  height: 30px;
  justify-content: center;
}

.navbar li:last-child img {
  width: 128px;
  height: 64px;
}

.navbar li:last-child a:hover {
  background: none;
  color: inherit;
  opacity: 1;
}

.intro-main {
  width: 1100px;
  margin: 100px auto 0 auto; /* 顶部留出导航高度 */
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.intro-main img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  background: #fff;
  padding: 0;
}