/* 图标继承文字颜色；与按钮文字分离，隐藏于辅助技术。 */
.ui-icon{display:inline-block;width:18px;height:18px;flex:0 0 auto;vertical-align:-.18em;fill:currentColor;stroke:none;pointer-events:none}
.main-nav a>span{display:inline-flex;align-items:center;justify-content:center;flex:0 0 20px;width:20px;height:20px;line-height:1}
.main-nav .ui-icon{width:19px;height:19px}
.text-button>.ui-icon,.secondary>.ui-icon,.primary>.ui-icon{margin-inline:3px}
.pdf-file-icon .ui-icon{width:26px;height:26px}.upload-plus .ui-icon{width:20px;height:20px}
.material-empty>.ui-icon{width:28px;height:28px;color:#8a97aa}
.question-icon .ui-icon{width:30px;height:30px}.subtle-note>span .ui-icon{width:16px;height:16px}
.empty-steps .ui-icon{width:14px;height:14px}.studio-bottom a{display:inline-flex;align-items:center;gap:5px}
.buddy-panel>button .ui-icon{width:14px;height:14px;margin-left:4px}.pdf-preview-zoom span .ui-icon{width:13px;height:13px}
@media(max-width:740px){.main-nav a>span{flex-basis:18px;width:18px;height:18px}.main-nav .ui-icon{width:17px;height:17px}}