.tch-empty{display:grid;justify-items:center;gap:10px;padding:36px 20px;text-align:center;color:var(--theme-muted)}.tch-empty i{font-size:30px;opacity:.6}.tch-empty p{margin:0;max-width:42ch;font-size:13.5px}.tch-meter{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;min-width:0}.tch-meter-label{font-size:12.5px;color:var(--theme-muted);white-space:nowrap}.tch-meter-track{height:4px;border-radius:999px;overflow:hidden;background:color-mix(in srgb,var(--theme-text) 10%,transparent)}.tch-meter-fill{display:block;height:100%;border-radius:999px;transition:width var(--motion-fast) var(--motion-ease)}.tch-meter-fill[data-tone=good]{background:var(--theme-success, #18a184)}.tch-meter-fill[data-tone=mid]{background:var(--theme-warning, #d6a520)}.tch-meter-fill[data-tone=low]{background:color-mix(in srgb,var(--theme-text) 35%,transparent)}.tch-meter-value{font-size:12.5px;font-weight:700;font-variant-numeric:tabular-nums}.tch-person{display:inline-flex;align-items:center;gap:9px;min-width:0;border:0;background:transparent;padding:2px;color:inherit;text-align:left;font:inherit}button.tch-person{cursor:pointer;border-radius:8px}button.tch-person:hover{background:color-mix(in srgb,var(--theme-brand) 8%,transparent)}.tch-person-avatar{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:50%;overflow:hidden;background:color-mix(in srgb,var(--theme-brand) 16%,transparent);color:var(--theme-brand);font-size:12.5px;font-weight:800}.tch-person-avatar img{width:100%;height:100%;object-fit:cover}.tch-person-text{display:grid;min-width:0;line-height:1.25}.tch-person-text strong{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tch-person-text small{color:var(--theme-muted);font-size:11.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tch-stat{display:grid;gap:2px;align-content:start;padding:14px 16px;border:1px solid var(--theme-line);border-radius:12px;background:var(--theme-surface)}.tch-stat-value{font-size:24px;font-weight:800;font-variant-numeric:tabular-nums}.tch-stat-label{color:var(--theme-muted);font-size:12px}.tch-stat-delta{font-size:11.5px;font-weight:700}.tch-stat-delta[data-dir=up]{color:var(--theme-success, #18a184)}.tch-stat-delta[data-dir=down]{color:var(--theme-danger, #da5d76)}.tch-sheet-scrim{position:fixed;inset:0;z-index:70;background:color-mix(in srgb,var(--theme-text) 18%,transparent);opacity:0;transition:opacity var(--motion-fast) var(--motion-ease)}.tch-sheet-scrim.open{opacity:1}.tch-sheet{position:fixed;top:0;right:0;bottom:0;z-index:71;width:min(480px,92vw);display:grid;grid-template-rows:auto 1fr;background:var(--theme-surface);border-left:1px solid var(--theme-line);box-shadow:var(--theme-shadow-soft);transform:translate(100%);transition:transform .18s cubic-bezier(.2,.8,.2,1)}.tch-sheet.open{transform:translate(0)}.tch-sheet-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--theme-line)}.tch-sheet-head h3{margin:0;font-size:15px}.tch-sheet-body{padding:16px 18px;overflow-y:auto}@media(prefers-reduced-motion:reduce){.tch-sheet,.tch-sheet-scrim{transition:none}}.tch-tokens{display:flex;flex-wrap:wrap;align-items:center;gap:6px;padding:6px 8px;border:1px solid var(--theme-line);border-radius:10px;background:var(--theme-surface);cursor:text}.tch-tokens:focus-within{border-color:var(--theme-brand)}.tch-tokens input{flex:1;min-width:120px;border:0;background:transparent;color:inherit;font:inherit;outline:none;padding:3px 2px}.tch-token{display:inline-flex;align-items:center;gap:4px;padding:2px 4px 2px 9px;border-radius:999px;font-size:12.5px;font-weight:600;background:color-mix(in srgb,var(--theme-brand) 12%,transparent)}.tch-token[data-invalid="1"]{background:color-mix(in srgb,var(--theme-danger, #da5d76) 14%,transparent)}.tch-token button{display:grid;place-items:center;width:16px;height:16px;border:0;border-radius:50%;background:transparent;color:var(--theme-muted);cursor:pointer;font-size:13px;line-height:1}.tch-token button:hover{color:var(--theme-text);background:color-mix(in srgb,var(--theme-text) 10%,transparent)}.tch-bulkbar{position:fixed;left:50%;bottom:18px;z-index:60;display:flex;align-items:center;gap:8px;padding:8px 10px 8px 16px;border:1px solid var(--theme-line);border-radius:999px;background:var(--theme-surface-strong);box-shadow:var(--theme-shadow-soft);transform:translate(-50%,12px);opacity:0;transition:transform var(--motion-fast) var(--motion-ease),opacity var(--motion-fast) var(--motion-ease)}.tch-bulkbar.open{transform:translate(-50%);opacity:1}.tch-bulkbar-count{font-size:12.5px;font-weight:700;white-space:nowrap}.tch-grid-wrap{overflow:auto;max-width:100%;border:1px solid var(--theme-line);border-radius:12px}.tch-grid{border-collapse:separate;border-spacing:0;width:100%;font-size:13px}.tch-grid th,.tch-grid td{padding:9px 12px;border-bottom:1px solid var(--theme-line);text-align:left;white-space:nowrap;background:var(--theme-surface)}.tch-grid thead th{position:sticky;top:0;z-index:2;background:var(--theme-surface-strong);font-size:11.5px;font-weight:750;text-transform:uppercase;letter-spacing:.02em;color:var(--theme-muted)}.tch-grid .tch-grid-frozen{position:sticky;left:0;z-index:1}.tch-grid thead .tch-grid-frozen{z-index:3}.tch-grid tbody tr:hover td{background:color-mix(in srgb,var(--theme-brand) 5%,var(--theme-surface))}.tch-grid tbody tr.selected td{background:color-mix(in srgb,var(--theme-brand) 10%,var(--theme-surface))}.tch-grid td:focus-visible{outline:2px solid var(--theme-brand);outline-offset:-2px;border-radius:4px}.tch-grid .tch-grid-check{width:34px;text-align:center}.tch-density-compact .tch-grid th,.tch-density-compact .tch-grid td{padding:5px 10px}.tch-menu{position:relative;display:inline-flex}.tch-menu-pop{position:absolute;right:0;top:calc(100% + 4px);z-index:40;min-width:168px;padding:4px;display:grid;gap:2px;border:1px solid var(--theme-line);border-radius:10px;background:var(--theme-surface-strong);box-shadow:var(--theme-shadow-soft)}.tch-menu-item{display:flex;align-items:center;gap:8px;padding:7px 9px;border:0;border-radius:7px;background:transparent;color:inherit;font:inherit;text-align:left;cursor:pointer;white-space:nowrap}.tch-menu-item:hover{background:var(--theme-surface)}.tch-menu-item.danger{color:var(--theme-danger, #da5d76)}.tch-stream-divider{display:flex;align-items:center;gap:10px;margin:18px 0 8px;color:var(--theme-muted);font-size:11.5px;font-weight:750;text-transform:uppercase;letter-spacing:.04em}.tch-stream-divider:before,.tch-stream-divider:after{content:"";flex:1;border-top:1px solid var(--theme-line)}.tch-announcement{padding:14px 16px;margin-bottom:10px;border:1px solid var(--theme-line);border-radius:12px;background:var(--theme-surface)}.tch-announcement.unseen{border-color:color-mix(in srgb,var(--theme-brand) 40%,var(--theme-line))}.tch-announcement header{display:flex;align-items:center;gap:8px}.tch-announcement header strong{flex:1;font-size:14px}.tch-announce-menu{display:flex;gap:4px}.tch-announce-meta{font-size:12px;margin:2px 0 8px}.tch-announce-body p{margin:0 0 8px}.tch-announcement footer{font-size:11.5px;margin-top:8px}.tch-chip{padding:1px 8px;border-radius:999px;background:color-mix(in srgb,var(--theme-text) 8%,transparent);color:var(--theme-muted);font-size:10.5px;font-weight:700;white-space:nowrap}.tch-syllabus{margin-bottom:14px;padding:10px 14px;border:1px solid var(--theme-line);border-radius:12px;background:var(--theme-surface)}.tch-syllabus summary{cursor:pointer;font-weight:700;display:flex;align-items:center;gap:8px}.tch-syllabus-upload-dialog{width:min(600px,calc(100vw - 32px));overflow:hidden}.tch-syllabus-upload-shell{padding:26px}.tch-syllabus-upload-head{display:grid;grid-template-columns:auto 1fr auto;align-items:start;gap:14px;margin-bottom:22px}.tch-syllabus-upload-mark{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:color-mix(in srgb,var(--theme-brand) 12%,var(--theme-surface));color:var(--theme-brand);font-size:23px}.tch-syllabus-eyebrow{display:block;margin:1px 0 4px;color:var(--theme-brand);font-size:10.5px;font-weight:800;letter-spacing:.09em;text-transform:uppercase}.tch-syllabus-upload-head h3{margin:0;font-size:21px;letter-spacing:-.025em}.tch-syllabus-upload-head p{margin:6px 0 0;max-width:48ch;color:var(--theme-muted);font-size:13px;line-height:1.5}.tch-syllabus-close{display:grid;place-items:center;width:34px;height:34px;padding:0;border:0;border-radius:10px;background:transparent;color:var(--theme-muted);font:inherit;font-size:18px;cursor:pointer}.tch-syllabus-close:hover{background:var(--theme-surface-strong);color:var(--theme-text)}.tch-syllabus-dropzone{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:6px 14px;min-height:154px;padding:24px;border:1.5px dashed color-mix(in srgb,var(--theme-brand) 46%,var(--theme-line));border-radius:18px;background:color-mix(in srgb,var(--theme-brand) 4%,var(--theme-surface));cursor:pointer;outline:none;transition:border-color var(--motion-fast) var(--motion-ease),background var(--motion-fast) var(--motion-ease),box-shadow var(--motion-fast) var(--motion-ease),transform var(--motion-fast) var(--motion-ease)}.tch-syllabus-dropzone[hidden]{display:none}.tch-syllabus-dropzone:hover,.tch-syllabus-dropzone:focus-within,.tch-syllabus-dropzone.is-dragging{border-color:var(--theme-brand);background:color-mix(in srgb,var(--theme-brand) 8%,var(--theme-surface));box-shadow:0 0 0 4px color-mix(in srgb,var(--theme-brand) 12%,transparent)}.tch-syllabus-dropzone.is-dragging{transform:translateY(-2px)}.tch-syllabus-drop-icon{grid-row:1 / 3;display:grid;place-items:center;width:52px;height:52px;border-radius:16px;background:var(--theme-surface-strong);color:var(--theme-brand);box-shadow:0 8px 22px color-mix(in srgb,var(--theme-brand) 13%,transparent);font-size:27px}.tch-syllabus-drop-copy{display:grid;gap:3px;min-width:0}.tch-syllabus-drop-copy strong{font-size:14.5px}.tch-syllabus-drop-copy span{color:var(--theme-muted);font-size:12.5px}.tch-syllabus-browse{grid-column:3;grid-row:1 / 3;white-space:nowrap;background:var(--theme-surface-strong)}.tch-syllabus-dropzone>small{grid-column:2 / 4;color:var(--theme-muted);font-size:11px}.tch-syllabus-selected{display:flex;align-items:center;gap:12px;min-height:80px;padding:14px 16px;border:1px solid color-mix(in srgb,var(--theme-brand) 28%,var(--theme-line));border-radius:16px;background:color-mix(in srgb,var(--theme-brand) 5%,var(--theme-surface))}.tch-syllabus-selected[hidden]{display:none}.tch-syllabus-selected-icon{display:grid;place-items:center;width:42px;height:42px;flex:none;border-radius:12px;background:color-mix(in srgb,var(--theme-brand) 13%,var(--theme-surface));color:var(--theme-brand);font-size:21px}.tch-syllabus-selected-copy{display:grid;gap:3px;min-width:0;flex:1}.tch-syllabus-selected-copy strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13.5px}.tch-syllabus-selected-copy small{color:var(--theme-muted);font-size:11.5px}.tch-syllabus-selected>button{display:grid;place-items:center;width:34px;height:34px;flex:none;padding:0;border:0;border-radius:10px;background:transparent;color:var(--theme-muted);font:inherit;font-size:17px;cursor:pointer}.tch-syllabus-selected>button:hover{background:color-mix(in srgb,var(--theme-text) 7%,transparent);color:var(--theme-text)}.tch-syllabus-error{margin:10px 0 0;padding:9px 12px;border-radius:10px;background:color-mix(in srgb,var(--theme-danger, #da5d76) 10%,transparent);color:var(--theme-danger, #c7445e);font-size:12px;font-weight:650}.tch-syllabus-upload-actions{display:flex;align-items:center;gap:8px;margin-top:20px}.tch-syllabus-upload-actions>span{display:inline-flex;align-items:center;gap:6px;margin-right:auto;color:var(--theme-muted);font-size:11px}.tch-syllabus-upload-actions>span i{color:var(--theme-brand);font-size:15px}.tch-syllabus-upload-actions .primary{justify-content:center;min-width:158px}.tch-syllabus-upload-actions .primary:disabled{opacity:.45;cursor:not-allowed}.tch-syllabus-upload-actions .primary:disabled:hover{background:var(--theme-brand)}@media(max-width:620px){.tch-syllabus-upload-shell{padding:20px}.tch-syllabus-upload-head{grid-template-columns:1fr auto}.tch-syllabus-upload-mark{display:none}.tch-syllabus-dropzone{grid-template-columns:auto 1fr;padding:20px}.tch-syllabus-browse{grid-column:1 / -1;grid-row:auto;justify-content:center;margin-top:7px}.tch-syllabus-dropzone>small{grid-column:1 / -1;text-align:center}.tch-syllabus-upload-actions{flex-wrap:wrap}.tch-syllabus-upload-actions>span{width:100%;margin-bottom:3px}.tch-syllabus-upload-actions .tch-btn{flex:1;justify-content:center}}.tch-uploadzone{display:flex;align-items:center;gap:14px;margin:0 0 16px;padding:13px 16px;border:1.5px dashed color-mix(in srgb,var(--theme-brand) 32%,var(--theme-line));border-radius:14px;background:color-mix(in srgb,var(--theme-brand) 3%,var(--theme-surface));transition:border-color var(--motion-fast) var(--motion-ease),background var(--motion-fast) var(--motion-ease)}.tch-uploadzone-icon{flex:0 0 auto;font-size:24px;color:var(--theme-brand)}.tch-uploadzone-copy{display:grid;gap:1px;flex:1;min-width:0}.tch-uploadzone-copy strong{font-size:13.5px;font-weight:700}.tch-uploadzone-copy .tch-muted{font-size:12px}.tch-uploadzone .tch-btn{flex:0 0 auto}.tch-module{margin-bottom:14px;border:1px solid var(--theme-line);border-radius:14px;background:var(--theme-surface);box-shadow:0 1px 2px color-mix(in srgb,var(--theme-text) 5%,transparent)}.tch-module.is-hidden{opacity:.7;border-style:dashed}.tch-unit:hover{border-color:color-mix(in srgb,var(--theme-brand) 22%,var(--theme-line))}.tch-module-head{display:flex;align-items:center;gap:10px;padding:12px 14px;min-height:56px;border-bottom:1px solid var(--theme-line);border-radius:13px 13px 0 0;background:var(--theme-surface-strong);cursor:pointer;user-select:none}.tch-module.is-collapsed>.tch-module-head{border-bottom-color:transparent;border-radius:13px}.tch-module-head strong{font-size:15px;font-weight:750;line-height:1.25}.tch-module-caret{flex:0 0 auto;display:grid;place-items:center;width:24px;height:24px;padding:0;border:0;border-radius:7px;background:transparent;color:var(--theme-muted);font-size:14px;cursor:pointer}.tch-module-caret:hover{background:color-mix(in srgb,var(--theme-text) 8%,transparent);color:var(--theme-text)}.tch-module-caret i{transform:rotate(90deg);transition:transform .16s var(--motion-ease)}.tch-module.is-collapsed>.tch-module-head .tch-module-caret i{transform:rotate(0)}.tch-module-title{display:grid;gap:1px;flex:1;min-width:0}.tch-module-title strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tch-module-sub{font-size:11.5px;color:var(--theme-muted)}.tch-container-icon{flex:0 0 auto;font-size:22px;color:var(--theme-brand)}.tch-unit-head{min-height:62px;padding:13px 16px}.tch-unit-head strong{font-size:17px}.tch-unit-head .tch-container-icon{font-size:24px}.tch-module-menu{display:flex;gap:2px;opacity:0;transition:opacity var(--motion-fast) var(--motion-ease)}.tch-module-head:hover .tch-module-menu,.tch-module-head:focus-within .tch-module-menu{opacity:1}.tch-module-empty{padding:12px 14px;margin:0;font-size:12.5px}.tch-content-item{display:flex;align-items:center;gap:10px;min-height:46px;padding:7px 12px 7px 8px;border-bottom:1px solid color-mix(in srgb,var(--theme-line) 50%,transparent);transition:background var(--motion-fast) var(--motion-ease)}.tch-content-item:last-child{border-bottom:0}.tch-content-item:hover{background:color-mix(in srgb,var(--theme-brand) 5%,transparent)}.tch-content-item.done .tch-item-open{color:var(--theme-muted)}.tch-content-item.is-pending{color:var(--theme-muted);cursor:default}.tch-content-item.is-pending:hover{background:none}.tch-content-item.is-pending .tch-item-open{cursor:default}.tch-content-item.is-pending .cleverly-loader{--loader-color: var(--theme-brand)}.tch-item-open{flex:1;min-width:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;line-clamp:2;overflow:hidden;overflow-wrap:anywhere;padding:2px 0;border:0;background:transparent;color:inherit;font:inherit;font-size:13.5px;text-align:left;cursor:pointer}.tch-item-open:hover{color:var(--theme-brand)}.tch-item-state{flex:0 0 auto;color:var(--theme-muted);font-size:17px}.tch-item-icon{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;color:var(--theme-muted)}.tch-item-icon-glyph{font-size:20px;line-height:1}.tch-ficon{display:block;height:24px;width:auto}.tch-ficon-tone-image{color:var(--theme-brand-strong)}.tch-ficon-tone-video{color:var(--theme-danger)}.tch-ficon-tone-audio{color:var(--theme-brand)}.tch-ficon-tone-archive{color:var(--theme-warning)}.tch-ficon-tone-code{color:var(--theme-brand-strong)}.tch-dialog-library{width:min(760px,calc(100vw - 32px))}.tch-library-mount{display:block;max-height:min(58vh,520px);overflow:hidden}.tch-library-mount .library-page,.tch-library-mount .library-panel{padding:0}.tch-item-menu{display:flex;gap:2px;opacity:0;transition:opacity var(--motion-fast) var(--motion-ease)}.tch-content-item:hover .tch-item-menu,.tch-content-item:focus-within .tch-item-menu{opacity:1}#tchNextUpBar{position:sticky;bottom:12px;display:flex;justify-content:center;margin-top:14px}.tch-lesson{margin:10px 12px 12px;border-radius:12px;box-shadow:none;border:1px solid color-mix(in srgb,var(--theme-line) 70%,transparent);border-left:3px solid color-mix(in srgb,var(--theme-brand) 45%,var(--theme-line));background:color-mix(in srgb,var(--theme-text) 2%,transparent)}.tch-lesson .tch-module-head{min-height:44px;padding:7px 10px;background:transparent}.tch-lesson .tch-module-head strong{font-size:13px;font-weight:700}.tch-lesson .tch-container-icon{font-size:18px}.tch-module-loose{border-style:dashed}.tch-drag-handle{flex:0 0 auto;color:var(--theme-muted);opacity:0;cursor:grab;font-size:16px;transition:opacity var(--motion-fast) var(--motion-ease)}.tch-module-head:hover .tch-drag-handle,.tch-content-item:hover .tch-drag-handle,body.tch-dragging-now .tch-drag-handle{opacity:.75}.tch-content-item[draggable]{user-select:none}.tch-dragging{opacity:.4}.tch-content-item.tch-drop-before{box-shadow:inset 0 2px 0 0 var(--theme-brand)}.tch-content-item.tch-drop-after{box-shadow:inset 0 -2px 0 0 var(--theme-brand)}.tch-module-items.tch-drop-over,.tch-uploadzone.tch-drop-over,.tch-content-empty.tch-drop-over{outline:2px dashed var(--theme-brand);outline-offset:-4px;border-radius:12px;background:color-mix(in srgb,var(--theme-brand) 7%,transparent)}.tch-uploadzone.tch-drop-over{border-color:var(--theme-brand)}.tch-module-head.tch-drop-over{background:color-mix(in srgb,var(--theme-brand) 12%,var(--theme-surface-strong))}body.tch-filedrag .tch-module-items,body.tch-filedrag .tch-uploadzone,body.tch-filedrag .tch-content-empty{outline:1px dashed color-mix(in srgb,var(--theme-brand) 45%,transparent);outline-offset:-4px;border-radius:12px}body.tch-filedrag .tch-uploadzone{border-color:var(--theme-brand);background:color-mix(in srgb,var(--theme-brand) 8%,var(--theme-surface))}body.tch-dragging-now .tch-drop-hint{opacity:1}.tch-add-row{display:flex;align-items:center;gap:8px;padding:8px 10px;flex-wrap:wrap;border-top:1px dashed color-mix(in srgb,var(--theme-line) 70%,transparent);border-radius:0 0 13px 13px}.tch-add-row .tch-btn.small{font-size:12px;padding:4px 10px;border-radius:8px}.tch-btn.ghost{border-color:transparent;background:transparent}.tch-btn.ghost:hover{background:color-mix(in srgb,var(--theme-text) 6%,transparent)}.tch-caret-tiny{font-size:11px;opacity:.7}.tch-add-menu{position:relative;display:inline-flex}.tch-add-menu .tch-menu-pop{left:0;right:auto;min-width:186px}.tch-menu-icon{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;width:18px;height:20px}.tch-menu-icon svg{display:block;height:18px;width:auto}.tch-menu-icon .ph{font-size:15px;color:var(--theme-muted)}.tch-drop-hint{margin-left:auto;font-size:11px;opacity:.75;transition:opacity var(--motion-fast) var(--motion-ease)}.tch-content-empty{display:flex;flex-direction:column;align-items:center;gap:8px;padding:44px 20px;border:2px dashed var(--theme-line);border-radius:16px;text-align:center;color:var(--theme-muted);background:color-mix(in srgb,var(--theme-brand) 2%,transparent)}.tch-content-empty .ph{font-size:30px;color:var(--theme-brand)}.tch-content-empty p{margin:0;max-width:46ch}.tch-content-empty p strong{color:var(--theme-text);font-size:15px}.tch-content-empty-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:6px}.tch-content-skeleton{--tch-skel: color-mix(in srgb, var(--theme-text) 9%, transparent)}.tch-skel-block{display:block;border-radius:6px;background:var(--tch-skel);background-image:linear-gradient(90deg,transparent 0%,color-mix(in srgb,var(--theme-surface) 70%,transparent) 50%,transparent 100%);background-size:260px 100%;background-repeat:no-repeat;animation:tch-skel-sweep 1.25s linear infinite}.tch-skel-line{flex:1;height:11px}.tch-skel-dot{flex:0 0 auto;width:20px;height:20px;border-radius:7px}.tch-skel-strip{display:flex;align-items:center;gap:14px;margin:0 0 16px;min-height:52px;padding:13px 16px;border:1.5px dashed var(--theme-line);border-radius:14px}.tch-skel-strip .tch-skel-dot{width:24px;height:24px}.tch-skel-module{pointer-events:none}.tch-skel-module>.tch-module-head{cursor:default}.tch-skel-item{display:flex;align-items:center;gap:10px;min-height:46px;padding:7px 12px 7px 8px;border-bottom:1px solid color-mix(in srgb,var(--theme-line) 50%,transparent)}.tch-skel-item:last-child{border-bottom:0}.tch-skel-item .tch-skel-line{max-width:60%}.tch-skel-item:nth-child(2) .tch-skel-line{max-width:44%}.tch-skel-item:nth-child(3) .tch-skel-line{max-width:52%}@keyframes tch-skel-sweep{0%{background-position:-260px 0}to{background-position:calc(100% + 260px) 0}}@media(prefers-reduced-motion:reduce){.tch-skel-block{animation:none;background-image:none}}.tch-content-error{display:flex;flex-direction:column;align-items:center;gap:8px;padding:40px 20px;border:1px solid var(--theme-line);border-radius:16px;text-align:center;color:var(--theme-muted)}.tch-content-error .ph{font-size:28px;color:var(--theme-danger, #da5d76)}.tch-content-error p{margin:0;max-width:46ch}.tch-content-error p strong{color:var(--theme-text);font-size:15px}.tch-content-error .tch-btn{margin-top:6px}.tch-content-bar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:14px}.tch-bar-sep{width:1px;height:22px;background:var(--theme-line);margin:0 2px}.tch-bar-right{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-left:auto}.tch-btn-logo{display:inline-flex;align-items:center;justify-content:center;width:17px;height:19px}.tch-btn-logo svg{display:block;height:18px;width:auto}.tch-dialog-title{display:flex;align-items:center;gap:10px;margin:0 0 6px;font-size:16px}.tch-dialog-logo{display:inline-flex}.tch-dialog-logo svg{display:block;height:26px;width:auto}.tch-dialog-google{width:min(520px,calc(100vw - 32px))}.tch-google-source-options{display:grid;grid-template-columns:1fr 1fr;gap:9px}.tch-google-source{display:flex;align-items:center;gap:10px;min-width:0;padding:11px 12px;border:1px solid var(--theme-line);border-radius:11px;background:var(--theme-bg);color:var(--theme-text);font:inherit;text-align:left;cursor:pointer}.tch-google-source:hover{border-color:color-mix(in srgb,var(--theme-brand) 45%,var(--theme-line))}.tch-google-source.is-active{border-color:var(--theme-brand);background:color-mix(in srgb,var(--theme-brand) 8%,var(--theme-surface));box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--theme-brand) 20%,transparent)}.tch-google-source>i{flex:0 0 auto;width:24px;color:var(--theme-brand);font-size:23px}.tch-google-source>span:last-child{display:grid;gap:1px;min-width:0}.tch-google-source strong{font-size:13px}.tch-google-source small{color:var(--theme-muted);font-size:11px;line-height:1.3}.tch-google-source-logo{display:inline-flex;align-items:center;justify-content:center;flex:0 0 24px}.tch-google-source-logo svg{display:block;width:24px;height:auto}.tch-google-source-panel{display:grid;gap:9px}.tch-google-picker-open{justify-self:start}.tch-google-picker-status{margin:-2px 0 0;font-size:12px}.tch-google-picker-status.is-error{color:var(--theme-danger)}.tch-google-name-hint{margin:-6px 0 0;font-size:12px}.tch-google-name-hint.is-warn{color:var(--theme-danger)}.tch-google-picked{display:flex;align-items:center;gap:11px;min-width:0;padding:10px 12px;border:1px solid var(--theme-line);border-radius:10px;background:var(--theme-surface-strong)}.tch-google-picked[hidden]{display:none}.tch-google-picked-icon{display:inline-flex;align-items:center;justify-content:center;flex:0 0 26px}.tch-google-picked-icon svg{display:block;height:30px;width:auto}.tch-google-picked>span:last-child{display:grid;gap:2px;min-width:0}.tch-google-picked strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13.5px}.tch-google-picked small{color:var(--theme-muted);font-size:11.5px}@media(max-width:560px){.tch-google-source-options{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){.tch-module-caret i,.tch-content-item,.tch-drag-handle,.tch-uploadzone{transition:none}}.tch-rte{border:1px solid var(--theme-line);border-radius:10px;background:var(--theme-surface);overflow:hidden}.tch-rte-toolbar{display:flex;align-items:center;gap:2px;flex-wrap:wrap;padding:6px 8px;border-bottom:1px solid var(--theme-line);background:var(--theme-surface-strong)}.tch-rte-btn{border:0;background:transparent;color:var(--theme-muted);border-radius:6px;padding:5px 7px;cursor:pointer;font-size:14px;line-height:1}.tch-rte-btn b{font-size:11px}.tch-rte-btn:hover{background:color-mix(in srgb,var(--theme-text) 8%,transparent);color:var(--theme-text)}.tch-rte-sep{width:1px;height:18px;background:var(--theme-line);margin:0 4px}.tch-rte-surface{min-height:180px;max-height:55vh;overflow-y:auto;padding:12px 14px;outline:none;font-size:13.5px;line-height:1.55}.tch-rte-surface:empty:before{content:attr(data-placeholder);color:var(--theme-muted);pointer-events:none}.tch-rte-surface p{margin:0 0 8px}.tch-rte-surface h2,.tch-rte-surface h3{margin:12px 0 6px}.tch-rte-surface blockquote{margin:8px 0;padding:4px 12px;border-left:3px solid var(--theme-line);color:var(--theme-muted)}.tch-rte-surface pre{padding:8px 10px;border-radius:8px;background:color-mix(in srgb,var(--theme-text) 6%,transparent);overflow-x:auto}.tch-rte-surface img{max-width:100%;border-radius:8px}.tch-rte-surface table{border-collapse:collapse;margin:8px 0}.tch-rte-surface th,.tch-rte-surface td{border:1px solid var(--theme-line);padding:4px 10px;min-width:60px}.tch-import-strip{display:flex;flex-direction:column;gap:6px;margin:0 0 14px;padding:10px 12px;border:1px solid var(--theme-line);border-radius:10px;background:var(--theme-surface-strong)}.tch-import-row{display:flex;align-items:center;justify-content:space-between;gap:10px}.tch-quiz-match{display:flex;align-items:center;gap:10px;margin:6px 0}.tch-quiz-match>span{min-width:160px}.tch-quiz-order{margin:6px 0;padding-left:22px}.tch-quiz-order li{display:flex;align-items:center;gap:6px;padding:4px 0}.tch-quiz-order li>span{flex:1}.tch-quiz-blank{display:flex;align-items:center;gap:10px;margin:6px 0}body:has(#tchContentViewer:not([hidden])){overflow:hidden}.tch-shell:has(#tchContentViewer:not([hidden])),.tch-main-col:has(#tchContentViewer:not([hidden])){height:100dvh;min-height:0;overflow:hidden}#tchContentViewer.tch-main{width:100%;max-width:none;height:100%;min-height:0;padding:8px 16px 12px;overflow:hidden}#tchViewerHost{height:100%;min-height:0}.tch-content-legacy{margin-top:18px}.tch-content-legacy summary{cursor:pointer;color:var(--theme-muted);font-weight:700;font-size:12.5px}.tch-page-read p{margin:0 0 10px}#tchGradebookGrid .tch-grid th,#tchGradebookGrid .tch-grid td{text-align:center}#tchGradebookGrid .tch-grid th.tch-grid-frozen,#tchGradebookGrid .tch-grid td.tch-grid-frozen{text-align:left}#tchGradebookGrid thead th small{display:block;font-weight:500;color:var(--theme-muted)}.tch-cell{cursor:cell;min-width:64px;font-variant-numeric:tabular-nums}.tch-cell[data-status=missing]{color:var(--theme-danger, #da5d76);font-weight:700}.tch-cell[data-status=excused]{color:var(--theme-muted)}.tch-cell input{width:56px;border:2px solid var(--theme-brand);border-radius:6px;padding:2px 4px;font:inherit;text-align:center;background:var(--theme-surface);color:inherit}.tch-cell-final{font-weight:800;font-variant-numeric:tabular-nums}.tch-cell-final small{color:var(--theme-muted);font-weight:600;margin-left:4px}.tch-grid-avg td,.tch-grid-avg th{color:var(--theme-muted);font-size:12px;border-top:2px solid var(--theme-line)}.tch-grid-hint{font-size:12px;margin-top:8px}.tch-my-final{display:flex;align-items:baseline;gap:10px;margin-bottom:14px}.tch-my-final strong{font-size:28px}.tch-category-row{align-items:end}.tch-form-row{display:flex;gap:12px;align-items:start}.tch-form-row>label{flex:1}.tch-quiz-qlist{max-height:200px;overflow-y:auto;border:1px solid var(--theme-line);border-radius:10px;padding:6px 10px;margin:8px 0}.tch-quiz-qpick{display:flex;padding:3px 0}.tch-quiz-facts{padding-left:18px}.tch-quiz-q{border:1px solid var(--theme-line);border-radius:12px;padding:10px 14px;margin-bottom:12px}.tch-quiz-q legend{font-weight:700;padding:0 4px}.tch-quiz-q .tch-check{display:flex;padding:3px 0}.tch-quiz-score{display:flex;align-items:baseline;gap:12px;margin-bottom:14px}.tch-quiz-score strong{font-size:30px}.tch-quiz-review{display:flex;align-items:start;gap:10px;padding:8px 0;border-bottom:1px solid color-mix(in srgb,var(--theme-line) 55%,transparent)}.tch-quiz-review div{flex:1}.tch-quiz-review p{margin:0}.tch-quiz-review.right i{color:var(--theme-success, #18a184)}.tch-quiz-review.wrong i{color:var(--theme-danger, #da5d76)}.tch-quiz-qstat{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-bottom:1px solid color-mix(in srgb,var(--theme-line) 55%,transparent)}.tch-quiz-qstat.low span:last-child{color:var(--theme-danger, #da5d76);font-weight:700}.tch-bank-q{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid color-mix(in srgb,var(--theme-line) 55%,transparent)}.tch-bank-q-stem{flex:1}.tch-question-editor{border:1px solid var(--theme-line);border-radius:12px;padding:12px 14px;margin-top:12px}.tch-question-editor legend{font-weight:700;padding:0 4px}.tch-dialog-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}.tch-dialog-head h3{flex:1;margin:0}