client/src/css/components/_settings-menu.scss

// 设置菜单样式（Theme/Language 下拉等共用）
.settings-menu-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-family-ui);
  font-size: var(--font-size-base);
  line-height: 1.4;
}

.online-count {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  color: var(--text-muted, var(--text-color));
  opacity: 0.85;
  font-size: 11px;
  line-height: 1.15;
  user-select: none;
}

.online-count-label,
.online-count-value {
  white-space: nowrap;
}

.online-count-value {
  font-variant-numeric: tabular-nums;
  min-width: 1.5ch;
  text-align: center;
}

.settings-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--button-bg);
  color: var(--text-color);
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 400;
  line-height: 1;
  box-shadow: none;
  box-sizing: border-box;
  transition: background-color 0.2s ease, border-color 0.2s ease;

  .settings-icon {
    font-size: 16px;
    line-height: 1;
  }

  &:hover {
    background-color: var(--button-hover-bg);
  }

  &:active {
    background-color: var(--button-active-bg);
  }
}

.settings-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 4px;
  background: var(--button-bg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  width: max-content;
  min-width: 180px;
}

.settings-menu-item {
  padding: 8px 12px;
  box-sizing: border-box;
}

.settings-menu-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.settings-menu-label {
  white-space: nowrap;
  flex-shrink: 0;
}

.settings-menu-control {
  flex-shrink: 0;
}

.settings-menu-checkbox input[type='checkbox'] {
  cursor: pointer;
  margin: 0;
}

.settings-menu-btn {
  padding: 4px 8px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--button-bg);
  color: var(--text-color);
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  white-space: nowrap;
  box-shadow: none;
  box-sizing: border-box;
  transition: background-color 0.2s ease;

  &:hover {
    background-color: var(--button-hover-bg);
  }

  &:active {
    background-color: var(--button-active-bg);
  }
}

.settings-menu-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 4px 0;
}

// Theme/Language/Token render style 等下拉共用
#dark_mode_toggle,
.settings-dropdown-in-menu {
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;

  .settings-dropdown {
    position: relative;
    display: inline-block;

    .settings-dropdown-btn {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 4px 8px;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      background: var(--button-bg);
      color: var(--text-color);
      cursor: pointer;
      font-size: inherit;
      font-family: inherit;
      font-weight: 500;
      box-shadow: none;
      box-sizing: border-box;
      transition: background-color 0.2s ease, border-color 0.2s ease;
      white-space: nowrap;

      &:hover {
        background-color: var(--button-hover-bg);
      }

      &.active {
        background-color: var(--button-hover-bg);
        border-color: var(--button-border);
      }

      &:active {
        background-color: var(--button-active-bg);
      }
    }

    .settings-dropdown-menu {
      position: absolute;
      top: 100%;
      left: 0;
      margin-top: 4px;
      min-width: 100%;
      width: max-content;
      box-sizing: border-box;
      background: var(--panel-bg);
      border: 1px solid var(--border-color);
      border-radius: 4px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
      z-index: 1001;
      opacity: 0;
      visibility: hidden;
      transform: translateY(-10px);
      transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
      pointer-events: none;
      overflow: hidden;

      &.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
      }

      .settings-dropdown-option {
        display: flex;
        align-items: center;
        gap: 6px;
        width: 100%;
        padding: 8px 12px;
        border: none;
        background: transparent;
        color: var(--text-color);
        cursor: pointer;
        font-size: inherit;
        font-family: inherit;
        font-weight: 400;
        box-shadow: none;
        box-sizing: border-box;
        text-align: left;
        transition: background-color 0.2s ease;
        white-space: nowrap;

        &:hover {
          background-color: var(--hover-bg-color);
        }

        &.active {
          background-color: var(--hover-bg-color);
          font-weight: 500;
          cursor: not-allowed;
          pointer-events: none;
          opacity: 0.5;
        }

        &:first-child {
          border-radius: 4px 4px 0 0;
        }

        &:last-child {
          border-radius: 0 0 4px 4px;
        }

        &:only-child {
          border-radius: 4px;
        }
      }
    }
  }
}

.settings-menu .settings-dropdown-btn {
  padding: 2px 6px;
  font-size: inherit;
}

:root[data-theme='dark'] {
  #dark_mode_toggle .settings-dropdown-menu,
  .settings-dropdown-in-menu .settings-dropdown-menu {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }
}