/* =====================================================
   聚银 GS PACK 导航栏样式
   Header + 下拉菜单 + 移动端汉堡菜单
   ===================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

/* --- Logo --- */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  text-decoration: none;
}
.logo img {
  height: 40px;
}

/* --- 桌面端导航 --- */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-6);
  margin: 0;
  padding: 0;
}
.main-nav li {
  margin: 0;
  position: relative; /* for dropdown */
}
.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  background-color: rgba(0, 87, 179, 0.05);
}

/* --- 下拉菜单容器 --- */
.has-dropdown {
  position: relative;
}
.has-dropdown > a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.has-dropdown > a::after {
  content: "▾";
  font-size: 0.7em;
  display: inline-block;
  transition: transform var(--transition-fast);
}
.has-dropdown:hover > a::after {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 1000;
}
.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  display: block;
  margin: 0;
}
.dropdown-menu a {
  display: block;
  padding: var(--space-2) var(--space-4);
  border-radius: 0;
  color: var(--color-text);
  font-weight: 400;
  white-space: nowrap;
}
.dropdown-menu a:hover {
  background-color: var(--color-light);
  color: var(--color-primary);
}

/* --- 语言切换 --- */
.lang-switch {
  display: flex;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
}
.lang-switch a {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--color-text-light);
}
.lang-switch a.active,
.lang-switch a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* --- 汉堡菜单 --- */
.hamburger {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1000;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 3px 0;
  transition: all var(--transition-base);
  border-radius: var(--radius-sm);
}
.hamburger.active span:nth-child(1) {
  transform: rotate(-45deg) translate(-5px, 6px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(45deg) translate(-5px, -6px);
}

/* --- 响应式适配 --- */
@media (max-width: 991px) {
  .hamburger {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-white);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-6);
    padding: var(--space-12) var(--space-6);
    transition: right var(--transition-base);
    overflow-y: auto;
  }
  .main-nav.active {
    right: 0;
  }

  .main-nav ul {
    flex-direction: column;
    width: 100%;
    gap: var(--space-3);
  }
  .main-nav li {
    width: 100%;
  }
  .main-nav a {
    display: block;
    padding: var(--space-3);
    width: 100%;
  }

  /* 移动端下拉菜单 */
  .has-dropdown > a::after {
    content: "▾";
    float: right;
  }
  .has-dropdown.open > a::after {
    transform: rotate(180deg);
  }
  .dropdown-menu {
    position: static;
    min-width: auto;
    box-shadow: none;
    background: var(--color-light);
    border-radius: var(--radius-sm);
    padding: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }
  .has-dropdown.open .dropdown-menu {
    max-height: 500px;
  }
  .dropdown-menu a {
    padding: var(--space-2) var(--space-6);
    font-size: var(--font-size-sm);
  }

  .lang-switch {
    width: 100%;
    justify-content: flex-start;
  }
}

/* --- 页面内容调整，避免被固定导航遮挡 --- */
body {
  padding-top: 70px;
}