/* ============ 基础布局 ============ */
.header {
  width: 100%;
  position: relative;
  z-index: 100;
  display: block;
}

.top__area {
  width: 100%;
  height: 42px;
  background-color: #1b4e3fff;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 0.5rem 2rem;
  gap: 10px;
  z-index: 11;
  position: relative;
}

.top__area img {
  height: 20px;
  width: auto;
}

.header__main {
  position: absolute;
  top: 42px;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 0 2rem;
  /* background: linear-gradient(135deg, #2c6b56 0%, #1b4e3f 100%); */
  min-height: 120px;
}

.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo img {
  height: 102px;
  width: auto;
  transition: transform 0.3s ease;
}

.header__logo img:hover {
  transform: scale(1.05);
}

.header__nav {
  flex: 1;
  display: flex;
  justify-content: center;
  margin-top: 2.5rem;
}

/* ============ 导航网格布局 ============ */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 15px;
  width: 100%;
  max-width: 800px;
  list-style: none;
  padding: 0;
  margin: 0;
}

/* ============ 导航项基础样式 ============ */
.nav-grid > li {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 50px;
}

/* ============ 主导航链接样式 ============ */
.nav-grid > li > a {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  padding: 0.8rem 1rem;
  border-radius: 6px;
  transition: all 0.3s ease;
  position: relative;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.nav-grid > li > a:hover {
  color: #ffdc73;
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ============ 下拉菜单容器 ============ */
.dropdown-content {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: rgba(27, 78, 63, 0.98);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  min-width: 200px;
  padding: 1rem 0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.1);

  /* 动画效果 */
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  z-index: 100;
}

/* 悬停时显示下拉菜单 */
.dropdown:hover .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(5px);
}

/* ============ 下拉菜单列表样式 ============ */
.dropdown-content ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.dropdown-content li {
  width: 100%;
}

.dropdown-content a {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  display: block;
  padding: 0.8rem 1.5rem;
  transition: all 0.3s ease;
  border-left: 3px solid transparent;
  position: relative;
  overflow: hidden;
}

.dropdown-content a:hover {
  background: linear-gradient(90deg, rgba(47, 107, 83, 0.6), transparent);
  color: #ffdc73;
  border-left-color: #ffdc73;
  padding-left: 2rem;
}

.dropdown-content a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: #ffdc73;
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.dropdown-content a:hover::before {
  transform: scaleY(1);
}

/* ============ 下拉箭头指示器 ============ */
.dropdown > a::after {
  content: "▾";
  font-size: 0.8rem;
  margin-left: 8px;
  opacity: 0.7;
  transition: all 0.3s ease;
  display: inline-block;
}

.dropdown:hover > a::after {
  transform: rotate(180deg);
  opacity: 1;
}

/* ============ 确保所有下拉菜单都向下弹出 ============ */
.nav-grid > li:nth-child(5) .dropdown-content,
.nav-grid > li:nth-child(6) .dropdown-content,
.nav-grid > li:nth-child(7) .dropdown-content,
.nav-grid > li:nth-child(8) .dropdown-content {
  top: 100%; /* 统一向下弹出 */
  bottom: auto; /* 移除底部定位 */
  transform: translateX(-50%) translateY(-10px); /* 统一动画起始位置 */
}

.nav-grid > li:nth-child(5):hover .dropdown-content,
.nav-grid > li:nth-child(6):hover .dropdown-content,
.nav-grid > li:nth-child(7):hover .dropdown-content,
.nav-grid > li:nth-child(8):hover .dropdown-content {
  transform: translateX(-50%) translateY(5px); /* 统一动画结束位置 */
}

/* ============ 确保下拉菜单有足够的显示空间 ============ */
.header__main {
  min-height: 140px;
  padding-bottom: 1rem;
}

/* ============ 防止下拉菜单被截断 ============ */
.header {
  overflow: visible !important;
}

.header__main {
  overflow: visible !important;
}

.header__nav {
  overflow: visible !important;
}

.nav-grid {
  overflow: visible !important;
}

.dropdown {
  overflow: visible !important;
}

/* ============ 响应式设计 ============ */
@media (max-width: 1200px) {
  .header__main {
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    position: relative;
    min-height: auto;
  }

  .header__logo {
    margin-bottom: 1rem;
  }

  .nav-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
  }

  .nav-grid > li > a {
    font-size: 0.9rem;
    padding: 0.6rem 0.8rem;
  }
}

@media (max-width: 968px) {
  .nav-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, auto);
    gap: 8px;
  }

  .header__main {
    position: relative;
    top: 0;
    padding: 0.5rem;
  }

  .header__nav {
    margin-top: 1rem;
  }

  /* 移动端下拉菜单样式调整 */
  .dropdown-content {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: rgba(27, 78, 63, 0.9);
    margin-top: 0.5rem;
    display: none;
    min-width: auto;
  }

  .dropdown:hover .dropdown-content {
    display: block;
    transform: none;
  }
}

@media (max-width: 480px) {
  .nav-grid {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(8, auto);
  }

  .nav-grid > li > a {
    font-size: 0.85rem;
    padding: 0.8rem 0.5rem;
  }
}

/* ============ 确保下拉菜单在最上层 ============ */
.dropdown-content {
  z-index: 1000;
}

.header {
  z-index: 1000;
}