.cb-root{background:var(--wh-surface);font-family:var(--wh-font);z-index:5;flex-direction:column;display:flex;position:fixed;inset:0}.cb-root--embedded{z-index:0;background:var(--wh-surface);flex:1;width:100%;height:100%;min-height:0;position:relative;inset:auto}.cb-loading{color:var(--wh-text-muted);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;font-size:14px;display:flex}.cb-bar{background:var(--wh-surface);border-bottom:1px solid var(--wh-border-light,var(--wh-border));flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;height:60px;padding:0 16px;display:flex}.cb-bar-left{flex:1;align-items:center;gap:10px;min-width:0;display:flex}.cb-bar-right{flex-shrink:0;align-items:center;gap:6px;display:flex}.cb-bar-group{align-items:center;gap:4px;display:flex}.cb-bar-icon{border-radius:var(--wh-radius-md,8px);color:var(--wh-text-muted);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;width:34px;height:34px;transition:background-color .15s,color .15s;display:flex}.cb-bar-icon:hover:not(:disabled){background:var(--wh-surface-hover);color:var(--wh-text)}.cb-bar-icon:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.cb-bar-icon:disabled{opacity:.4;cursor:default}.cb-bar-title{font-family:var(--wh-font);color:var(--wh-text);border-radius:var(--wh-radius-md,8px);text-overflow:ellipsis;background:0 0;border:1px solid #0000;outline:none;flex:auto;min-width:80px;padding:5px 8px;font-size:16px;font-weight:400;transition:background-color .15s,border-color .15s}.cb-bar-title::placeholder{color:var(--wh-text-muted);font-weight:400}.cb-bar-title:hover{border-color:var(--wh-border-light,var(--wh-border))}.cb-bar-title:focus{background:var(--wh-surface-hover);border-color:var(--wh-indigo)}.cb-bar-divider{background:var(--wh-border);flex-shrink:0;width:1px;height:22px;margin:0 4px}.cb-save{font-size:12px;font-weight:400;font-family:var(--wh-font);white-space:nowrap;border-radius:var(--wh-radius-pill,999px);flex-shrink:0;align-items:center;gap:5px;padding:3px 10px;display:inline-flex}.cb-save--saving{color:var(--wh-text-muted);background:var(--wh-surface-hover)}.cb-save--unsaved{color:var(--wh-warning);background:var(--wh-warning-light,var(--wh-warning-soft))}.cb-save--error{color:var(--wh-error);background:var(--wh-error-light)}.cb-save--saved{color:var(--wh-success);background:var(--wh-success-light,var(--wh-success-soft))}.cb-save-dot{background:var(--wh-warning);border-radius:50%;width:7px;height:7px}.cb-save-retry{color:var(--wh-error);font-family:var(--wh-font);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;align-items:center;gap:4px;margin-left:4px;padding:1px 4px;font-size:12px;font-weight:400;text-decoration:underline;display:inline-flex}.cb-save-retry:hover{background:var(--wh-error-light)}.cb-save-retry:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.cb-workspace{flex:1;min-height:0;display:flex;overflow:hidden}.cb-preview{border-left:1px solid var(--wh-border-light,var(--wh-border));background:var(--wh-bg);flex-direction:column;flex-shrink:0;width:400px;min-height:0;display:flex}@media (width<=1280px){.cb-preview{width:360px}}.cb-rail{border-right:1px solid var(--wh-border-light,var(--wh-border));background:var(--wh-bg);flex-direction:column;flex-shrink:0;width:348px;min-height:0;display:flex}.cb-rail-head{flex-direction:column;flex-shrink:0;gap:3px;padding:16px 16px 10px;display:flex}.cb-rail-title{color:var(--wh-text);text-transform:uppercase;letter-spacing:.05em;font-size:12px;font-weight:400}.cb-rail-meta{color:var(--wh-text-muted);font-size:11.5px;font-weight:400}.cb-rail-scroll{flex:1;min-height:0;padding:4px 14px 14px;overflow-y:auto}.cb-rail-empty{color:var(--wh-text-muted);text-align:center;flex-direction:column;align-items:center;gap:10px;padding:40px 16px;font-size:13px;display:flex}.cb-rail-empty-icon{border-radius:var(--wh-radius-lg,12px);background:var(--wh-surface);border:1px solid var(--wh-border-light,var(--wh-border));color:var(--wh-text-muted);justify-content:center;align-items:center;width:52px;height:52px;display:flex}.cb-rail-empty-title{color:var(--wh-text);font-size:13.5px;font-weight:400}.cb-rail-empty-sub{color:var(--wh-text-muted);max-width:240px;font-size:12.5px;line-height:1.5}.cb-rail-sections{flex-direction:column;gap:10px;display:flex}.cb-rail-skeleton{flex-direction:column;gap:10px;padding:4px 0;display:flex}.cb-skel-section{border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-lg,12px);background:var(--wh-surface);flex-direction:column;gap:10px;padding:12px;display:flex}.cb-skel-bar{border-radius:var(--wh-radius-pill,999px);background:linear-gradient(90deg,var(--wh-surface-hover)0%,var(--wh-surface-active)50%,var(--wh-surface-hover)100%);background-size:200% 100%;height:12px;animation:1.4s ease-in-out infinite cb-shimmer}@keyframes cb-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.cb-section{border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-lg,12px);background:var(--wh-surface);box-shadow:var(--wh-shadow-card,0 1px 2px #0f172a0b);transition:box-shadow .18s,border-color .18s;overflow:hidden}.cb-section--dragging{opacity:.85;box-shadow:var(--wh-shadow-lg);border-color:var(--wh-indigo)}.cb-section--drop-target{border-color:var(--wh-indigo);box-shadow:0 0 0 1px var(--wh-indigo)inset}.cb-section-head{align-items:center;gap:4px;padding:8px 8px 8px 4px;display:flex}.cb-section-grip,.cb-section-toggle{color:var(--wh-text-muted);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;transition:background-color .12s,color .12s;display:flex}.cb-section-toggle:hover{background:var(--wh-surface-hover);color:var(--wh-text)}.cb-section-grip{cursor:grab}.cb-section-grip:active{cursor:grabbing}.cb-section-grip:focus-visible,.cb-section-toggle:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-2px}.cb-section-title{font-family:var(--wh-font);color:var(--wh-text);border-radius:var(--wh-radius-sm,6px);background:0 0;border:1px solid #0000;outline:none;flex:1;min-width:0;padding:5px 8px;font-size:13.5px;font-weight:400;transition:background-color .12s,border-color .12s}.cb-section-title::placeholder{color:var(--wh-text-muted)}.cb-section-title:hover{background:var(--wh-surface-hover)}.cb-section-title:focus{background:var(--wh-surface-hover);border-color:var(--wh-indigo)}.cb-section-count{color:var(--wh-text-muted);background:var(--wh-surface-hover);border-radius:var(--wh-radius-pill,999px);text-align:center;flex-shrink:0;min-width:22px;padding:2px 9px;font-size:11px;font-weight:400}.cb-section-remove{color:var(--wh-text-muted);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;transition:background-color .12s,color .12s;display:flex}.cb-section-remove:hover{background:var(--wh-error-light);color:var(--wh-error)}.cb-section-remove:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-2px}.cb-section-body{padding:0 8px 8px}.cb-lessons{flex-direction:column;gap:8px;min-height:8px;display:flex}.cb-lessons-empty{color:var(--wh-text-muted);text-align:center;border:1px dashed var(--wh-border);border-radius:var(--wh-radius-md,8px);padding:12px 8px;font-size:12px}.cb-lesson{border-radius:var(--wh-radius-md,8px);cursor:pointer;border:1px solid #0000;align-items:center;gap:8px;padding:8px 8px 8px 4px;transition:background-color .12s,border-color .12s;display:flex;position:relative}.cb-lesson:hover{background:var(--wh-surface-hover)}.cb-lesson--selected{background:var(--course-accent-muted);border-color:color-mix(in srgb,var(--course-accent)35%,transparent);box-shadow:inset 3px 0 0 0 var(--course-accent)}.cb-lesson--selected .cb-lesson-title{font-weight:400}.cb-lesson--dragging{opacity:.55;background:var(--wh-surface)}.cb-lesson:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-2px}.cb-lesson--drop-before:before{content:"";background:var(--wh-indigo);border-radius:2px;height:2px;position:absolute;top:-5px;left:6px;right:6px}.cb-lesson-grip{color:var(--wh-text-muted);cursor:grab;border-radius:var(--wh-radius-sm,6px);opacity:.5;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;transition:opacity .12s,background-color .12s;display:flex}.cb-lesson:hover .cb-lesson-grip,.cb-lesson--selected .cb-lesson-grip{opacity:1}.cb-lesson-grip:active{cursor:grabbing}.cb-lesson-grip:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-2px;opacity:1}.cb-lesson-chip{border-radius:var(--wh-radius-sm,6px);background:var(--course-accent-muted);color:var(--course-accent);flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;display:flex}.cb-lesson-index{color:var(--wh-text-muted);text-align:right;font-variant-numeric:tabular-nums;flex-shrink:0;min-width:14px;font-size:11px;font-weight:400}.cb-lesson-title{color:var(--wh-text);text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-size:13.5px;overflow:hidden}.cb-lesson-actions{opacity:0;gap:2px;transition:opacity .12s;display:flex}.cb-lesson:hover .cb-lesson-actions,.cb-lesson--selected .cb-lesson-actions,.cb-lesson:focus-within .cb-lesson-actions{opacity:1}.cb-lesson-act{color:var(--wh-text-muted);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;justify-content:center;align-items:center;width:24px;height:24px;transition:background-color .12s,color .12s;display:flex}.cb-lesson-act:hover{background:var(--wh-surface-active);color:var(--wh-text)}.cb-lesson-act:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-1px}.cb-lesson-act--danger:hover{background:var(--wh-error-light);color:var(--wh-error)}.cb-section-foot{padding-top:8px}.cb-add-lesson{border:1px dashed var(--wh-border-strong,var(--wh-border));color:var(--wh-text-muted);font-family:var(--wh-font);border-radius:var(--wh-radius-md,8px);cursor:pointer;background:0 0;align-items:center;gap:6px;padding:7px 12px;font-size:12.5px;font-weight:400;transition:border-color .15s,color .15s,background-color .15s;display:inline-flex}.cb-add-lesson:hover{border-color:var(--wh-indigo);color:var(--wh-indigo);background:var(--wh-indigo-muted)}.cb-add-lesson:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.cb-add-lesson-compact{color:var(--wh-text-muted);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;justify-content:center;align-items:center;width:24px;height:24px;display:inline-flex}.cb-rail-foot{border-top:1px solid var(--wh-border-light,var(--wh-border));background:var(--wh-bg);flex-direction:column;flex-shrink:0;gap:8px;padding:12px 14px;display:flex}.cb-add-section{border:1px solid var(--wh-border);background:var(--wh-surface);color:var(--wh-text);font-family:var(--wh-font);border-radius:var(--wh-radius-md,8px);cursor:pointer;justify-content:center;align-items:center;gap:7px;width:100%;padding:10px;font-size:13px;font-weight:400;transition:border-color .15s,color .15s,background-color .15s,box-shadow .15s;display:inline-flex}.cb-add-section:hover{border-color:var(--wh-indigo);color:var(--wh-indigo);box-shadow:var(--wh-shadow-card)}.cb-add-section:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.cb-add-section--ai{color:var(--wh-text-secondary)}.cb-add-section--ai:hover{color:var(--wh-indigo);border-color:var(--wh-indigo)}.cb-editor{background:var(--wh-surface);flex:1;justify-content:center;min-width:0;padding:24px 28px 56px;display:flex;overflow-y:auto}.cle-root,.cle-empty{flex-direction:column;gap:18px;width:100%;max-width:760px;display:flex}.cle-empty{text-align:center;color:var(--wh-text-muted);justify-content:center;align-items:center;gap:12px;padding-top:96px}.cle-empty-icon{border-radius:var(--wh-radius-xl,16px);background:var(--wh-bg);border:1px solid var(--wh-border-light,var(--wh-border));color:var(--wh-text-muted);justify-content:center;align-items:center;width:64px;height:64px;display:flex}.cle-empty-title{color:var(--wh-text);margin:4px 0 0;font-size:17px;font-weight:400}.cle-empty-sub{color:var(--wh-text-muted);max-width:360px;margin:0;font-size:13.5px;line-height:1.5}.cle-head{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.cle-head-chip{text-transform:uppercase;letter-spacing:.04em;color:var(--wh-text);background:var(--course-accent-muted);border-radius:var(--wh-radius-pill,999px);align-items:center;gap:6px;padding:5px 11px;font-size:11px;font-weight:400;display:inline-flex}.cle-head-chip-icon{color:var(--course-accent);align-items:center;display:inline-flex}.cle-breadcrumb{color:var(--wh-text-muted);align-items:center;gap:6px;min-width:0;font-size:12.5px;display:inline-flex}.cle-breadcrumb-sep{color:var(--wh-text-muted);opacity:.6;display:inline-flex}.cle-breadcrumb-section{color:var(--wh-text-secondary);text-overflow:ellipsis;white-space:nowrap;max-width:240px;font-weight:400;overflow:hidden}.cle-breadcrumb-current{color:var(--wh-text);font-weight:400}.cle-island{background:var(--wh-surface);border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-xl,16px);box-shadow:var(--wh-shadow-card,0 1px 2px #0f172a0b);flex-direction:column;gap:16px;padding:22px 24px;display:flex}.cle-title{font-family:var(--wh-font);color:var(--wh-text);border:none;border-bottom:1px solid var(--wh-border-light,var(--wh-border));background:0 0;outline:none;padding:2px 0 8px;font-size:24px;font-weight:400;transition:border-color .15s}.cle-title::placeholder{color:var(--wh-text-muted);font-weight:400}.cle-title:focus{border-bottom-color:var(--wh-indigo)}.cle-body{flex-direction:column;gap:14px;display:flex}.cle-foot{background:var(--wh-bg);border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-lg,12px);align-items:center;gap:12px;padding:12px 16px;display:flex}.cle-required{cursor:pointer;flex:1;align-items:center;gap:12px;display:flex}.cle-required-copy{color:var(--wh-text);flex-direction:column;gap:1px;font-size:13.5px;font-weight:400;display:flex}.cle-required-hint{color:var(--wh-text-muted);font-size:12px;font-weight:400;line-height:1.4}.cle-media{flex-direction:column;gap:14px;display:flex}.cle-media-actions{gap:8px;display:flex}.cle-media-preview{flex-direction:column;gap:8px;display:flex}.cle-media-video{border-radius:var(--wh-radius-lg,12px);border:1px solid var(--wh-border-light,var(--wh-border));width:100%;height:auto;max-height:280px}.cle-media-duration{color:var(--wh-text-secondary);background:var(--wh-surface-hover);border-radius:var(--wh-radius-pill,999px);align-self:flex-start;align-items:center;gap:6px;padding:4px 10px;font-size:12px;font-weight:400;display:inline-flex}.cle-link{flex-direction:column;gap:12px;display:flex}.cle-link-preview{color:var(--course-accent,var(--wh-indigo));word-break:break-all;background:var(--course-accent-muted,var(--wh-indigo-muted));border-radius:var(--wh-radius-md,8px);align-items:center;gap:8px;padding:8px 12px;font-size:13px;font-weight:400;text-decoration:none;display:inline-flex}.cle-link-preview:hover{text-decoration:underline}.cle-link-preview:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.tle-root{border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-lg,12px);background:var(--wh-surface);overflow:hidden}.tle-root:focus-within{border-color:var(--wh-indigo)}.tle-toolbar{border-bottom:1px solid var(--wh-border-light,var(--wh-border));background:var(--wh-bg);flex-wrap:wrap;align-items:center;gap:8px;padding:8px 10px;display:flex}.tle-group{align-items:center;gap:1px;display:flex}.tle-tool{border-radius:var(--wh-radius-sm,6px);cursor:pointer;color:var(--wh-text-secondary);background:0 0;border:none;justify-content:center;align-items:center;min-width:30px;height:30px;padding:0 4px;font-size:13px;font-weight:400;transition:background-color .12s,color .12s;display:flex}.tle-tool:hover{background:var(--wh-surface-hover);color:var(--wh-text)}.tle-tool:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-2px}.tle-tool--active{background:var(--wh-indigo-muted);color:var(--wh-indigo)}.tle-tool-bold{font-weight:400}.tle-tool-italic{font-style:italic}.tle-tool-underline{text-decoration:underline}.tle-tool-strike{text-decoration:line-through}.tle-tool-divider{background:var(--wh-border);width:1px;height:18px;margin:0 2px}.tle-linkpop{flex-direction:column;gap:10px;min-width:280px;display:flex}.tle-linkpop-title{color:var(--wh-text);letter-spacing:.01em;font-size:12px;font-weight:400}.tle-linkpop-row{align-items:center;gap:8px;display:flex}.tle-linkpop-row>.wh-input-wrap{flex:1}.tle-linkpop-actions{justify-content:space-between;align-items:center;gap:8px;display:flex}.tle-content{color:var(--wh-text);outline:none;max-width:680px;min-height:220px;padding:18px 20px;font-size:14.5px;line-height:1.7}.tle-content:focus{outline:none}.tle-content>:first-child{margin-top:0}.tle-content>:last-child{margin-bottom:0}.tle-content p{margin:0 0 12px}.tle-content h2{color:var(--wh-text);margin:22px 0 10px;font-size:20px;font-weight:400;line-height:1.3}.tle-content h3{color:var(--wh-text);margin:18px 0 8px;font-size:16.5px;font-weight:400;line-height:1.35}.tle-content ul,.tle-content ol{margin:0 0 12px;padding-left:24px}.tle-content li{margin:0 0 4px}.tle-content li::marker{color:var(--wh-text-muted)}.tle-content blockquote{border-left:3px solid var(--wh-indigo);color:var(--wh-text-secondary);margin:0 0 12px;padding:2px 0 2px 16px;font-style:italic}.tle-content a{color:var(--wh-indigo);text-underline-offset:2px;text-decoration:underline}.tle-content strong{font-weight:400}.qb-root{flex-direction:column;gap:16px;display:flex}.qb-card-settings{border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-lg,12px);background:var(--wh-surface);box-shadow:var(--wh-shadow-card,0 1px 2px #0f172a0b);overflow:hidden}.qb-settings-head{border-bottom:1px solid var(--wh-border-light,var(--wh-border));background:var(--wh-bg);align-items:center;gap:7px;padding:10px 14px;display:flex}.qb-settings-head-icon{color:var(--wh-text-muted);align-items:center;display:inline-flex}.qb-settings-head-title{color:var(--wh-text);font-size:12.5px;font-weight:400}.qb-settings-body{flex-direction:column;gap:2px;padding:6px 14px 12px;display:flex}.qb-settings-field{width:180px;padding:8px 0 4px}.qb-toggle-row{align-items:center;gap:10px;padding:9px 0;display:flex}.qb-toggle-row:not(:last-child){border-bottom:1px solid var(--wh-border-subtle,var(--wh-border))}.qb-toggle-copy{flex-direction:column;flex:1;gap:1px;min-width:0;display:flex}.qb-toggle-label{color:var(--wh-text);font-size:13px;font-weight:400}.qb-toggle-hint{color:var(--wh-text-muted);font-size:11.5px;line-height:1.4}.qb-empty{border:1px dashed var(--wh-border-strong,var(--wh-border));border-radius:var(--wh-radius-lg,12px);color:var(--wh-text-muted);text-align:center;flex-direction:column;align-items:center;gap:10px;padding:36px 24px;font-size:13px;display:flex}.qb-empty-icon{border-radius:var(--wh-radius-lg,12px);background:var(--course-accent-muted);color:var(--course-accent);justify-content:center;align-items:center;width:48px;height:48px;display:flex}.qb-list{flex-direction:column;gap:14px;display:flex}.qb-card{border:1px solid var(--wh-border-light,var(--wh-border));border-radius:var(--wh-radius-lg,12px);background:var(--wh-surface);box-shadow:var(--wh-shadow-card,0 1px 2px #0f172a0b);flex-direction:column;gap:14px;padding:14px;transition:box-shadow .18s,border-color .18s;display:flex}.qb-card--dragging{opacity:.85;box-shadow:var(--wh-shadow-lg);border-color:var(--course-accent,var(--wh-indigo))}.qb-card-head{align-items:center;gap:10px;display:flex}.qb-card-grip{color:var(--wh-text-muted);cursor:grab;border-radius:var(--wh-radius-sm,6px);opacity:.6;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;transition:opacity .12s,background-color .12s;display:flex}.qb-card:hover .qb-card-grip{opacity:1}.qb-card-grip:active{cursor:grabbing}.qb-card-grip:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-2px;opacity:1}.qb-card-num{color:var(--course-accent,var(--wh-indigo));background:var(--course-accent-muted,var(--wh-indigo-muted));border-radius:var(--wh-radius-pill,999px);white-space:nowrap;flex-shrink:0;align-items:center;padding:3px 10px;font-size:11.5px;font-weight:400;display:inline-flex}.qb-card-spacer{flex:1}.qb-card-remove{color:var(--wh-text-muted);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;width:30px;height:30px;transition:background-color .12s,color .12s;display:flex}.qb-card-remove:hover{background:var(--wh-error-light);color:var(--wh-error)}.qb-card-remove:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-1px}.qb-card-typerow{align-items:center;gap:8px;display:flex}.qb-card-typerow-label{color:var(--wh-text-muted);font-size:12px;font-weight:400}.qb-card-type{width:200px}.qb-options{flex-direction:column;gap:8px;display:flex}.qb-options-label{color:var(--wh-text-muted);font-size:12px;font-weight:400}.qb-option{align-items:center;gap:10px;display:flex}.qb-option--match{gap:8px}.qb-option--match>.wh-input-wrap{flex:1}.qb-option-match-icon{color:var(--wh-text-muted);flex-shrink:0;align-items:center;display:inline-flex}.qb-option-radio{accent-color:var(--course-accent,var(--wh-indigo));cursor:pointer;flex-shrink:0;width:18px;height:18px}.qb-option-radio:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.qb-option-check{--wh-indigo:var(--course-accent);flex-shrink:0}.qb-option>.wh-input-wrap{flex:1}.qb-option-remove{color:var(--wh-text-muted);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;transition:background-color .12s,color .12s;display:flex}.qb-option-remove:hover:not(:disabled){background:var(--wh-error-light);color:var(--wh-error)}.qb-option-remove:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:-1px}.qb-option-remove:disabled{opacity:.35;cursor:default}.qb-add-option{color:var(--course-accent,var(--wh-indigo));font-family:var(--wh-font);cursor:pointer;border-radius:var(--wh-radius-sm,6px);background:0 0;border:none;align-self:flex-start;align-items:center;gap:5px;padding:5px 6px;font-size:12.5px;font-weight:400;display:inline-flex}.qb-add-option:hover{background:var(--course-accent-muted,var(--wh-indigo-muted))}.qb-add-option:focus-visible{outline:2px solid var(--wh-indigo);outline-offset:1px}.qb-card-foot{border-top:1px solid var(--wh-border-subtle,var(--wh-border));gap:12px;padding-top:12px;display:flex}.qb-points-field{flex-shrink:0;width:96px}.qb-explain-field{flex:1}.qb-ai-panel{border:1px solid var(--course-accent,var(--wh-indigo));border-radius:var(--wh-radius-lg,12px);background:var(--course-accent-muted,var(--wh-indigo-muted));flex-direction:column;gap:12px;padding:16px;display:flex}.qb-ai-head{align-items:center;gap:8px;display:flex}.qb-ai-head-icon{color:var(--course-accent,var(--wh-indigo));align-items:center;display:inline-flex}.qb-ai-head-title{color:var(--wh-text);font-size:13px;font-weight:400}.qb-ai-head-sub{color:var(--wh-text-secondary);margin-left:auto;font-size:12px}.qb-ai-field-surface{background:var(--wh-surface);border-radius:var(--wh-radius-md,8px);padding:12px}.qb-ai-foot{align-items:flex-end;gap:10px;display:flex}.qb-ai-foot-spacer{flex:1}.qb-ai-loading{color:var(--wh-text-secondary);align-items:center;gap:8px;padding:4px 0;font-size:12.5px;display:flex}.qb-addbar{flex-wrap:wrap;align-items:center;gap:6px;padding-top:4px;display:flex}.qb-addbar-label{color:var(--wh-text-muted);margin-right:2px;font-size:12px;font-weight:400}.qb-addbar-divider{background:var(--wh-border);width:1px;height:20px;margin:0 4px}@media (width<=1000px){.cb-rail{width:296px}}@media (width<=880px){.cb-rail{width:268px}.cb-editor{padding:16px 16px 40px}.cle-island{padding:18px}}@media (prefers-reduced-motion:reduce){.cb-section,.cb-lesson,.qb-card,.cb-add-section,.cb-bar-title,.tle-tool{transition:none!important}.cb-skel-bar{animation:none!important}}