/* 通用样式 */
body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  color: white;
  background-image: url("背景2.png");
  background-size: cover;
  background-position: center;
  min-height: 100vh;
  position: relative;
}

/* 头部导航栏 */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
}

.site-title {
  font-size: 1.8rem;
  font-weight: bold;
  display: flex;
  align-items: center;
}

.site-title .logo {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin-right: 1rem;
}

.nav-links img {
  width: 24px;
  height: 24px;
  margin-left: 1rem;
  vertical-align: middle;
}

/* 中间主要内容，左半侧垂直居中 */
.main-content {
  display: flex;
  align-items: center;
  height: calc(100vh - 100px); /* 留出顶部 header 空间 */
  padding-left: 4rem;
}

.text-box-centered {
  max-width: 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.title {
  font-size: 2.5rem;
  font-weight: bold;
  margin-bottom: 1.5rem;
}

/* 文字内容整体右移两个字符（与标题错位） */
.description {
  font-size: 1.2rem;
  line-height: 1.6;
  margin: 0.4rem 0;
  margin-left: 2ch; /* ⬅️ 实现向右偏移两个字符宽度 */
}

/* CA区域 */
.ca-copy {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.ca-copy button {
  background-color: #2563eb;
  border: none;
  padding: 0.3rem 0.75rem;
  color: white;
  border-radius: 4px;
  cursor: pointer;
}

.ca-copy button:hover {
  background-color: #1d4ed8;
}

/* 底部 logo 图片现在放到 CA 下方 */
.logo-bottom {
  width: 4cm;
  height: 4cm;
  border-radius: 50%;
}