@charset "UTF-8";:root{color-scheme:light;--eduai-color-primary: #6d4aff;--eduai-color-primary-hover: #5d37f0;--eduai-color-primary-active: #4c28d7;--eduai-color-primary-strong: #3d157d;--eduai-color-primary-strong-hover: #311065;--eduai-color-primary-soft: #f3efff;--eduai-color-primary-focus: rgba(109, 74, 255, .18);--eduai-color-page: #f7f8fc;--eduai-color-surface: #ffffff;--eduai-color-surface-subtle: #f9fafb;--eduai-color-border: #d9ddea;--eduai-color-divider: #eaecf0;--eduai-color-text-heading: #101828;--eduai-color-text-body: #344054;--eduai-color-text-secondary: #667085;--eduai-color-text-placeholder: #98a2b3;--eduai-color-text-inverse: #ffffff;--eduai-color-success: #22a06b;--eduai-color-success-soft: #eaf8f1;--eduai-color-warning: #f79009;--eduai-color-warning-soft: #fff4e5;--eduai-color-danger: #d92d20;--eduai-color-danger-soft: #fef3f2;--eduai-font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans SC", sans-serif;--eduai-font-family-ui: "Microsoft YaHei UI", "PingFang SC", "Noto Sans SC", sans-serif;--eduai-font-family-display: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;--eduai-font-size-page-title: 24px;--eduai-font-size-section-title: 18px;--eduai-font-size-card-title: 16px;--eduai-font-size-body: 14px;--eduai-font-size-caption: 12px;--eduai-font-size-helper: 13px;--eduai-font-weight-regular: 400;--eduai-font-weight-medium: 500;--eduai-font-weight-semibold: 600;--eduai-font-weight-bold: 700;--eduai-line-height: 1.5;--eduai-letter-spacing: 0;--eduai-space-1: 4px;--eduai-space-2: 8px;--eduai-space-3: 12px;--eduai-space-4: 16px;--eduai-space-5: 20px;--eduai-space-6: 24px;--eduai-space-8: 32px;--eduai-radius-control: 6px;--eduai-radius-card: 8px;--eduai-radius-panel: 12px;--eduai-shadow-card: 0 8px 24px rgba(16, 24, 40, .06);--eduai-shadow-panel: 0 16px 40px rgba(16, 24, 40, .09);--eduai-control-height-sm: 32px;--eduai-control-height: 40px;--eduai-content-max-width: 1200px;--el-color-primary: var(--eduai-color-primary);--el-color-primary-light-3: #967dff;--el-color-primary-light-5: #b6a5ff;--el-color-primary-light-7: #d8ceff;--el-color-primary-light-8: #e7e1ff;--el-color-primary-light-9: var(--eduai-color-primary-soft);--el-color-primary-dark-2: var(--eduai-color-primary-active);--el-color-success: var(--eduai-color-success);--el-color-warning: var(--eduai-color-warning);--el-color-danger: var(--eduai-color-danger);--el-text-color-primary: var(--eduai-color-text-heading);--el-text-color-regular: var(--eduai-color-text-body);--el-text-color-secondary: var(--eduai-color-text-secondary);--el-text-color-placeholder: var(--eduai-color-text-placeholder);--el-border-color: var(--eduai-color-border);--el-border-color-light: var(--eduai-color-divider);--el-fill-color-blank: var(--eduai-color-surface);--el-bg-color-page: var(--eduai-color-page);--el-border-radius-base: var(--eduai-radius-control);--el-font-family: var(--eduai-font-family)}::placeholder{color:var(--eduai-color-text-placeholder);font-size:var(--eduai-font-size-body);opacity:1}:focus-visible{outline:2px solid var(--eduai-color-primary-focus);outline-offset:2px}:root{--teacher-tool-page-max-width: var(--eduai-content-max-width, 1200px);--teacher-tool-page-gutter: clamp(22px, 3.6vw, 60px);--teacher-tool-page-top: 20px;--teacher-tool-page-bottom: 56px;--teacher-tool-breadcrumb-height: 52px;--teacher-tool-scrollbar-width: 8px;--teacher-tool-scrollbar-gutter: 12px;--teacher-tool-card-width: 782px;--teacher-tool-card-padding-x: 24px;--teacher-tool-card-padding-y: 24px;--teacher-tool-title-icon-size: 44px;--teacher-tool-title-size: 22px;--teacher-tool-label-gap: 6px;--teacher-tool-control-height: var(--eduai-control-height, 40px);--teacher-tool-textarea-min-height: 96px;--teacher-tool-upload-min-height: 112px;--teacher-tool-generate-height: 44px;--teacher-tool-transition: .18s ease;--teacher-tool-tooltip-background: #24262f;--teacher-tool-tooltip-color: #fff;--teacher-tool-tooltip-offset: 8px}.teacher-icon-tooltip{position:relative;overflow:visible}.teacher-icon-tooltip[data-tooltip]:after{position:absolute;top:calc(100% + var(--teacher-tool-tooltip-offset));left:50%;z-index:100;box-sizing:border-box;padding:5px 9px;border-radius:4px;color:var(--teacher-tool-tooltip-color);background:var(--teacher-tool-tooltip-background);box-shadow:0 5px 14px #12141c2e;content:attr(data-tooltip);font-family:var(--eduai-font-family-ui, "Microsoft YaHei UI", "PingFang SC", sans-serif);font-size:12px;font-weight:500;line-height:1.25;white-space:nowrap;visibility:hidden;opacity:0;pointer-events:none;transform:translate(-50%,-3px);transition:opacity .16s ease,transform .16s ease,visibility 0s linear .16s}.teacher-icon-tooltip[data-tooltip]:hover:after,.teacher-icon-tooltip[data-tooltip]:focus-visible:after,.teacher-icon-tooltip[data-tooltip]:focus-within:after{visibility:visible;opacity:1;transform:translate(-50%);transition-delay:0s}.teacher-icon-tooltip--align-end[data-tooltip]:after{right:0;left:auto;transform:translateY(-3px)}.teacher-icon-tooltip--align-end[data-tooltip]:hover:after,.teacher-icon-tooltip--align-end[data-tooltip]:focus-visible:after,.teacher-icon-tooltip--align-end[data-tooltip]:focus-within:after{transform:translateY(0)}.teacher-preview-splitter{position:relative;display:grid;box-sizing:border-box;width:12px;min-width:12px;padding:0;place-items:center;border:0;background:transparent;cursor:col-resize;pointer-events:auto;touch-action:none;-webkit-user-select:none;user-select:none;outline:0;isolation:isolate}.teacher-preview-splitter:before{position:absolute;z-index:0;top:0;right:-2px;bottom:0;left:-2px;content:"";background:transparent}.teacher-preview-splitter>span{position:relative;z-index:1;width:1px;height:100%;background:#dfe2ea;pointer-events:none;transition:width .16s ease,background .16s ease}.teacher-preview-splitter:hover>span,.teacher-preview-splitter:focus-visible>span,.teacher-preview-splitter.is-dragging>span{width:3px;background:var(--eduai-color-primary, #6d4aff)}.teacher-tool-page{box-sizing:border-box;width:100%;min-height:100%;padding:var(--teacher-tool-page-top) var(--teacher-tool-page-gutter) var(--teacher-tool-page-bottom);color:var(--eduai-color-text-body, #344054);background:var(--eduai-color-page, #f7f8fc);font-family:var(--eduai-font-family-ui, "Microsoft YaHei UI", "PingFang SC", sans-serif);font-size:var(--eduai-font-size-body, 14px);line-height:var(--eduai-line-height, 1.5)}.teacher-tool-page--scroll{height:100%;min-height:0;overflow-x:hidden;overflow-y:auto}.teacher-tool-shell{box-sizing:border-box;width:min(100%,var(--teacher-tool-page-max-width));margin-inline:auto}.teacher-tool-breadcrumb{box-sizing:border-box;display:flex;align-items:center;gap:9px;min-height:var(--teacher-tool-breadcrumb-height);color:var(--eduai-color-text-secondary, #667085);font-size:14px;font-weight:400}.teacher-tool-breadcrumb-bar{position:sticky;top:0;z-index:35;box-sizing:border-box;width:100%;border-bottom:1px solid transparent;background:transparent;transition:border-color var(--teacher-tool-transition),background var(--teacher-tool-transition),box-shadow var(--teacher-tool-transition),backdrop-filter var(--teacher-tool-transition)}.teacher-tool-breadcrumb-bar.is-stuck{border-bottom-color:#ded8efb8;background:linear-gradient(90deg,#fffffff0,#f7fcffeb 54%,#fffffff0);box-shadow:0 8px 24px #422d6809;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.teacher-tool-breadcrumb-bar:after{position:absolute;right:calc(var(--teacher-tool-scrollbar-gutter) * -1);bottom:-1px;left:0;height:1px;background:transparent;content:"";pointer-events:none;transition:background var(--teacher-tool-transition)}.teacher-tool-breadcrumb-bar.is-stuck:after{background:#ded8efb8}.teacher-tool-scroll-frame{display:flex;flex-direction:column;height:100%;min-height:0;overflow:hidden}.teacher-tool-scroll-frame>.teacher-tool-breadcrumb-bar{position:relative;top:auto;flex:0 0 var(--teacher-tool-breadcrumb-height);min-height:var(--teacher-tool-breadcrumb-height)}.teacher-tool-scroll-viewport{flex:1 1 auto;height:auto;min-height:0;overflow-x:hidden;overflow-y:auto;scrollbar-color:#c5bdd8 transparent;scrollbar-width:thin}.teacher-tool-scroll-viewport::-webkit-scrollbar{width:var(--teacher-tool-scrollbar-width);height:var(--teacher-tool-scrollbar-width)}.teacher-tool-scroll-viewport::-webkit-scrollbar-track{background:transparent}.teacher-tool-scroll-viewport::-webkit-scrollbar-thumb{border:2px solid transparent;border-radius:999px;background:#c5bdd8;background-clip:padding-box}.teacher-tool-scroll-viewport::-webkit-scrollbar-thumb:hover{background:#aaa0c4;background-clip:padding-box}.teacher-tool-scrollbar{scrollbar-color:#c5bdd8 transparent;scrollbar-width:thin}.teacher-tool-scrollbar::-webkit-scrollbar{width:7px;height:7px}.teacher-tool-scrollbar::-webkit-scrollbar-track{background:transparent}.teacher-tool-scrollbar::-webkit-scrollbar-thumb{border:2px solid transparent;border-radius:999px;background:#c5bdd8;background-clip:padding-box}.teacher-tool-scrollbar::-webkit-scrollbar-thumb:hover{background:#aaa0c4;background-clip:padding-box}.teacher-tool-breadcrumb__link{position:relative;display:inline-flex;align-items:center;min-height:28px;padding:0;border:0;color:var(--eduai-color-text-secondary, #667085);background:transparent;font:inherit;cursor:pointer;transition:color var(--teacher-tool-transition)}.teacher-tool-breadcrumb__link:after{position:absolute;right:0;bottom:1px;left:0;height:1.5px;border-radius:999px;background:var(--eduai-color-primary, #6d4aff);content:"";opacity:0;transform:scaleX(0);transform-origin:left center;transition:transform var(--teacher-tool-transition),opacity .14s ease}.teacher-tool-breadcrumb__link:hover,.teacher-tool-breadcrumb__link:focus-visible{color:var(--eduai-color-primary, #6d4aff)}.teacher-tool-breadcrumb__link:hover:after,.teacher-tool-breadcrumb__link:focus-visible:after{opacity:1;transform:scaleX(1)}.teacher-tool-breadcrumb__separator{color:#aaa3b7;-webkit-user-select:none;user-select:none}.teacher-tool-breadcrumb__current{color:var(--eduai-color-text-heading, #101828);font-family:var(--eduai-font-family-display, "Microsoft YaHei", sans-serif);font-weight:600}.teacher-tool-card{box-sizing:border-box;width:min(100%,var(--teacher-tool-card-width));margin-inline:auto;padding:var(--teacher-tool-card-padding-y) var(--teacher-tool-card-padding-x);border:1px solid var(--eduai-color-border, #d9ddea);border-radius:var(--eduai-radius-card, 8px);background:var(--eduai-color-surface, #fff);box-shadow:var(--eduai-shadow-card, 0 8px 24px rgba(16, 24, 40, .06))}.teacher-tool-title{display:flex;align-items:flex-start;gap:12px}.teacher-tool-title__icon{position:relative;flex:0 0 auto;display:grid;place-items:center;width:var(--teacher-tool-title-icon-size);height:var(--teacher-tool-title-icon-size);color:var(--eduai-color-primary, #6d4aff)}.teacher-tool-title__copy{min-width:0}.teacher-tool-title__heading{margin:0 0 5px;color:var(--eduai-color-text-heading, #101828);font-family:var(--eduai-font-family-display, "Microsoft YaHei", sans-serif);font-size:var(--teacher-tool-title-size);font-weight:700;line-height:1.25;letter-spacing:0}.teacher-tool-title__description{margin:0;color:var(--eduai-color-text-secondary, #667085);font-size:13px;font-weight:400;line-height:1.55}.teacher-tool-section{margin-top:24px}.teacher-tool-section__title{margin:0 0 12px;color:var(--eduai-color-text-heading, #101828);font-family:var(--eduai-font-family-display, "Microsoft YaHei", sans-serif);font-size:14px;font-weight:600;line-height:1.5}.teacher-tool-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.teacher-tool-field{display:grid;gap:var(--teacher-tool-label-gap);min-width:0}.teacher-tool-field--full{grid-column:1 / -1}.teacher-tool-field__label{color:var(--eduai-color-text-heading, #101828);font-family:var(--eduai-font-family-display, "Microsoft YaHei", sans-serif);font-size:13px;font-weight:600;line-height:1.5}.teacher-tool-field__required{margin-left:2px;color:var(--eduai-color-danger, #d92d20);font-style:normal}.teacher-tool-control{box-sizing:border-box;width:100%;min-height:var(--teacher-tool-control-height);padding:0 12px;border:1px solid var(--eduai-color-border, #d9ddea);border-radius:var(--eduai-radius-control, 6px);color:var(--eduai-color-text-body, #344054);background:var(--eduai-color-surface, #fff);font:inherit;outline:none;transition:border-color var(--teacher-tool-transition),box-shadow var(--teacher-tool-transition),background var(--teacher-tool-transition)}textarea.teacher-tool-control{min-height:var(--teacher-tool-textarea-min-height);padding-block:10px;resize:vertical}.teacher-tool-control::placeholder{color:var(--eduai-color-text-placeholder, #98a2b3)}.teacher-tool-control:hover{border-color:var(--eduai-color-primary, #6d4aff)}.teacher-tool-control:focus,.teacher-tool-control:focus-visible{border-color:var(--eduai-color-primary, #6d4aff);box-shadow:0 0 0 3px var(--eduai-color-primary-focus, rgba(109, 74, 255, .18));outline:none}.teacher-tool-control[aria-invalid=true],.teacher-tool-control.is-error{border-color:var(--eduai-color-danger, #d92d20);box-shadow:0 0 0 3px #d92d201f}.teacher-tool-upload{position:relative;box-sizing:border-box;display:flex;min-height:var(--teacher-tool-upload-min-height);flex-direction:column;align-items:center;justify-content:center;padding:14px 16px;border:1px dashed var(--eduai-color-border, #d9ddea);border-radius:var(--eduai-radius-control, 6px);color:var(--eduai-color-text-secondary, #667085);background:var(--eduai-color-surface-subtle, #f9fafb);text-align:center;cursor:pointer;transition:border-color var(--teacher-tool-transition),background var(--teacher-tool-transition),box-shadow var(--teacher-tool-transition)}.teacher-tool-upload:hover,.teacher-tool-upload.is-active{border-color:var(--eduai-color-primary, #6d4aff);background:var(--eduai-color-primary-soft, #f3efff)}.teacher-tool-upload__icon{width:34px;height:34px;color:var(--eduai-color-primary, #6d4aff)}.teacher-tool-glyph{display:inline-block;flex:0 0 auto;width:20px;height:20px;color:var(--eduai-color-primary, #6d4aff);background-color:currentColor;-webkit-mask-position:center;mask-position:center;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;-webkit-mask-size:contain;mask-size:contain}.teacher-tool-glyph--upload{-webkit-mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' 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.teacher-tool-glyph{width:18px;height:18px}.teacher-tool-upload__hint{margin-top:9px;color:var(--eduai-color-text-body, #344054);font-size:14px}.teacher-tool-upload__action{padding:0;border:0;color:var(--eduai-color-primary, #6d4aff);background:transparent;font:inherit;font-weight:600;cursor:pointer}.teacher-tool-upload__action:hover,.teacher-tool-upload__action:focus-visible{color:var(--eduai-color-primary-hover, #5d37f0)}.teacher-tool-upload__formats{margin-top:5px;color:var(--eduai-color-text-secondary, #667085);font-size:12px}.teacher-tool-source-menu{position:absolute;z-index:40;box-sizing:border-box;width:260px;padding:8px;border:1px solid var(--eduai-color-divider, #eaecf0);border-radius:var(--eduai-radius-card, 8px);background:var(--eduai-color-surface, #fff);box-shadow:var(--eduai-shadow-panel, 0 16px 40px rgba(16, 24, 40, .09))}.teacher-tool-source-menu:before{position:absolute;top:-7px;left:50%;width:12px;height:12px;border-top:1px solid var(--eduai-color-divider, #eaecf0);border-left:1px solid var(--eduai-color-divider, #eaecf0);background:var(--eduai-color-surface, #fff);content:"";transform:translate(-50%) rotate(45deg)}.teacher-tool-source-menu__item{position:relative;z-index:1;display:flex;align-items:center;gap:12px;width:100%;min-height:44px;padding:0 12px;border:0;border-radius:var(--eduai-radius-control, 6px);color:var(--eduai-color-text-body, #344054);background:transparent;font:inherit;font-size:14px;text-align:left;cursor:pointer;transition:color var(--teacher-tool-transition),background var(--teacher-tool-transition)}.teacher-tool-source-menu__item svg,.teacher-tool-source-menu__item .teacher-tool-glyph{width:18px;height:18px}.teacher-tool-source-menu__item:hover,.teacher-tool-source-menu__item:focus-visible{color:var(--eduai-color-primary, #6d4aff);background:var(--eduai-color-primary-soft, #f3efff)}.teacher-tool-selected-file{position:relative;display:flex;align-items:center;gap:20px;min-height:176px;padding:20px 48px 20px 20px;border:1px solid var(--eduai-color-border, #d9ddea);border-radius:var(--eduai-radius-control, 6px);background:var(--eduai-color-surface-subtle, #f9fafb)}.teacher-tool-selected-file__remove{position:absolute;top:10px;right:10px;display:grid;width:30px;height:30px;place-items:center;padding:0;border:0;border-radius:var(--eduai-radius-control, 6px);color:var(--eduai-color-text-secondary, #667085);background:#e9edf5;cursor:pointer;transition:color var(--teacher-tool-transition),background var(--teacher-tool-transition)}.teacher-tool-selected-file__remove:hover{color:var(--eduai-color-text-heading, #101828);background:#dfe4ee}.teacher-tool-generate{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:var(--teacher-tool-generate-height);padding:0 18px;border:0;border-radius:var(--eduai-radius-control, 6px);color:var(--eduai-color-text-inverse, #fff);background:var(--eduai-color-primary-strong, 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