/* 顶部导航 */
.top-bar {
  background: var(--panel);
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

.top-content {
  max-width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* 左侧：标题 + 导航 */
.top-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.top-bar h1 {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

/* 导航菜单 */
.menu-bar {
  display: flex;
  align-items: center;
  gap: 0;
}

.menu-bar > * {
  width: 70px;
  padding: 0;
  margin: 0 12px;
  text-align: center;
  position: relative;
  font-size: 15px;
  color: var(--text);
  cursor: pointer;
  transition: 0.2s;
  white-space: nowrap;
}

.menu-bar > *:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 18px;
  background: var(--border);
}

.menu-bar > *:hover {
  color: var(--primary);
}

.dropdown {
  position: relative;
}
.dropdown-content {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  width: max-content;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  padding: 8px 0;
  display: none;
  z-index: 101;
}
.dropdown-content a {
  display: block;
  padding: 10px 18px;
  color: var(--text);
  text-decoration: none;
}
.dropdown-content a:hover {
  background: var(--hover);
  color: var(--primary);
}

.dropdown span {
  display: flex;
  align-items: center;
  gap: 4px;
}
.dropdown span i {
  transition: transform 0.2s;
}

/* 激活状态 */
.dropdown.active .dropdown-content {
  display: block;
}
.dropdown.active span i {
  transform: rotate(180deg);
}

/* 只有 PC 端 hover */
@media (min-width: 769px) {
  .dropdown:hover .dropdown-content {
    display: block;
  }
  .dropdown:hover span i {
    transform: rotate(180deg);
  }
}

/* 右侧：搜索 + 主题按钮 */
.top-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-input {
  width: 200px;
  height: 36px;
  border: 1px solid var(--border-dark);
  border-radius: 8px;
  padding: 0 12px;
  outline: none;
  font-size: 14px;
  background: var(--panel);
  color: var(--text);
}
.search-input:focus {
  border-color: var(--primary);
}
.search-btn {
  height: 36px;
  padding: 0 14px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: 0.2s;
}
.search-btn:hover {
  background: var(--primary-dark);
}

/* 主题切换按钮 */
.theme-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: var(--panel);
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: 0.2s;
}
.theme-btn:hover {
  background: var(--hover);
}

/* 三杠菜单按钮（手机显示） */
.menu-toggle {
  width: 26px;
  height: 20px;
  display: none;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
}
.menu-toggle span {
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}
.menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}