/* ============================================
   App Navigation - 顶部导航 + 移动端底部 Tab
   PC: 固定顶部，中间放页面 Tab
   Mobile: 固定底部，图标 + 文字 Tab
   ============================================ */

/* ---- 共享顶部栏 ---- */
.app-header {
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-page);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.app-header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-component);
  flex-shrink: 0;
}

.app-header-left a {
  text-decoration: none;
}

.app-header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-component);
  flex-shrink: 0;
}

/* ---- PC 中间导航 Tab ---- */
.app-nav-tabs {
  display: flex;
  background: var(--color-bg);
  border-radius: 8px;
  padding: 4px;
  gap: 0;
}

.app-nav-tab {
  padding: 7px 22px;
  border-radius: 6px;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.app-nav-tab:hover {
  color: var(--color-primary);
}

.app-nav-tab.active {
  background: var(--color-bg-card);
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(227, 56, 25, 0.12);
}

/* ---- 页面容器（为固定 header 留空间）---- */
.page-wrapper {
  padding-top: var(--header-height);
  min-height: 100vh;
  background: var(--color-bg);
}

/* ---- 通用内容区 ---- */
.page-content {
  padding: var(--spacing-page);
}

/* ---- 移动端底部 Tab ---- */
.app-bottom-nav {
  display: none;
}

/* ---- 移动端覆盖 ---- */
@media (max-width: 767px) {
  .app-header {
    padding: 0 var(--spacing-mobile);
  }

  .app-nav-tabs {
    display: none !important;
  }

  .app-header-admin-btns {
    display: none !important;
  }

  .app-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.06);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .app-bottom-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    text-decoration: none;
    color: var(--color-text-tertiary);
    font-size: 10px;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
  }

  .app-bottom-tab.active {
    color: var(--color-primary);
  }

  .app-bottom-tab-icon {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .app-bottom-tab-icon .icon {
    width: 22px;
    height: 22px;
    opacity: 0.45;
    transition: opacity var(--transition-fast);
  }

  .app-bottom-tab.active .app-bottom-tab-icon .icon {
    opacity: 1;
  }

  .page-wrapper {
    padding-bottom: 56px;
  }

  .page-content {
    padding: var(--spacing-mobile) 12px;
  }
}