/* =======================
   全局字体设置（可覆盖）
======================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

header {
  position: relative; /* 新增 */
  width: 100%;
  height: 70px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #ffffff;
  border-bottom: 1px solid #e5e5e5;
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  box-sizing: border-box;
  top: 0;
  left: 0;
  z-index: 1000;
}


/* ========== 左侧 Logo ========== */
header .logo {
  font-size: 22px;
  font-weight: 600;
  color: #111;
  text-decoration: none;
  margin-left: 365px;
}

/* ========== 导航 ========== */
header nav {
  display: flex;
  gap: 30px;
  margin-right: 360px;
}

header nav a {
  font-size: 16px;
  color: #333;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

header nav a:hover {
  color: #6d6d6d; /* hover 高亮 */
}

.hamburger {
  display: none;
  font-size: 24px;
  cursor: pointer;
}

#mobile-menu-lightbox {
  position: fixed;
  top: 70px;
  left: 0;
  width: 100%;
  height: calc(100vh - 50px);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(6px);
  display: none; /* 默认隐藏 */
  z-index: 9999;
}

.mobile-menu-content {
  position: absolute;
  top: 20px;      /* 让四个标题靠在 lightbox 顶部 */
  left: 20px;     /* 跟手机端 logo 的对齐风格 */
  display: flex;
  flex-direction: column;
  gap: 22px;
  text-align: left;
}

.mobile-menu-content a {
  font-size: 18px;
  text-decoration: none;
  color: #111;
}


/* 手机端样式 */
@media (max-width: 768px) {
  header {
    padding: 10px 20px;
    justify-content: space-between; /* 左右对齐 */
  }

  header .logo {
    margin-left: -30px;
    text-align: left;
  }

    /* 缩小 logo */
  header .logo img {
    width: 200px; /* 或根据实际需要调整，比如原来是 200px */
    height: auto; /* 保持比例 */
  }

  /* 显示汉堡按钮 */
  .hamburger {
    display: block;
  }

  /* 导航初始隐藏，点击汉堡展开 */
  header nav {
    position: absolute;
    top: 60px; /* 你的 header 高度，自己可调整 */
    right: 0;
    background: white;
    display: none; /* 默认隐藏 */
    flex-direction: column;
    gap: 15px;
    padding: 15px;
    box-shadow: 0px 4px 10px rgba(0,0,0,0.1);
    z-index: 999;
  }

  header nav.active {
    display: flex;
  }
}