/* Phase 1 Header 样式 + 手机端适配 */
.xx-top-nav {
  height: 68px;
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.92);
}

.xx-top-nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.xx-brand {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 20px;
  font-weight: 900;
  border: none;
  background: none;
  cursor: pointer;
  color: #0f172a;
  padding: 0;
  flex-shrink: 0;
}

.xx-logo {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background: linear-gradient(135deg, #818cf8, #4f46e5);
  display: grid;
  place-items: center;
  color: #fff;
  box-shadow: 0 12px 26px rgba(79, 70, 229, 0.24);
  font-size: 20px;
}

/* 桌面端导航链接 */
.xx-nav-links {
  display: flex;
  gap: 16px;
  color: #64748b;
  font-weight: 750;
}

.xx-nav-links button {
  border: none;
  background: none;
  cursor: pointer;
  color: #64748b;
  padding: 6px 4px;
  font-size: 14px;
  font-weight: 750;
  transition: color 0.2s;
  white-space: nowrap;
}

.xx-nav-links button:hover {
  color: #4f46e5;
}

.xx-nav-links button.active {
  color: #4f46e5;
}

/* 右侧区域 */
.xx-right-section {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.xx-user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: #0f172a;
  font-size: 14px;
}

.xx-avatar {
  width: 34px;
  height: 34px;
  background: #eef2ff;
  color: #4338ca;
}

/* 汉堡菜单按钮（默认隐藏） */
.xx-hamburger {
  display: none;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 20px;
  color: #64748b;
  padding: 8px;
}

/* 手机端导航抽屉内容 */
.xx-mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.xx-mobile-nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 16px;
  color: #334155;
  border-radius: 8px;
  transition: background 0.2s;
  width: 100%;
  text-align: left;
}

.xx-mobile-nav-item:hover {
  background: #f1f5f9;
}

.xx-mobile-nav-item.active {
  background: #eef2ff;
  color: #4f46e5;
  font-weight: 600;
}

.xx-mobile-nav-icon {
  font-size: 18px;
  width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== 手机端响应式 ===== */
@media (max-width: 768px) {
  .xx-top-nav {
    height: 56px;
  }

  .xx-top-nav-inner {
    padding: 0 12px;
  }

  .xx-brand-text {
    display: none;
  }

  /* 隐藏桌面端导航 */
  .xx-nav-links {
    display: none;
  }

  /* 显示汉堡菜单 */
  .xx-hamburger {
    display: block;
  }

  /* 隐藏用户名 */
  .xx-username {
    display: none;
  }
}

/* 小屏幕平板：导航文字缩小 */
@media (min-width: 769px) and (max-width: 1024px) {
  .xx-nav-links {
    gap: 8px;
  }

  .xx-nav-links button {
    font-size: 13px;
  }
}