.student-course-blocked{border-color:var(--danger)!important}.student-overview .empty-state{min-height:0;margin:16px 0;padding:16px;justify-items:start;border-radius:var(--radius-control);background:var(--surface-muted);line-height:1.5}.students-list>article>span:not(.student-avatar){color:var(--ink-muted);font-size:11px}.student-avatar{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--mint);font-size:13px;font-weight:800}.rich-content{min-height:160px;padding:var(--space-16);outline:none;font-size:16px;line-height:1.6}.rich-content:focus{box-shadow:inset 0 0 0 2px var(--lavender)}.rich-content p.is-editor-empty:first-child:before{height:0;float:inline-start;color:var(--ink-muted);content:attr(data-placeholder);pointer-events:none}.rich-content img,.student-rich-text img{display:block;max-width:100%;height:auto;margin:14px auto;border-radius:14px}.rich-content a,.student-rich-text a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--rose);text-decoration-thickness:2px}.rich-content pre,.student-rich-text pre{overflow:auto;padding:14px;border-radius:12px;color:var(--surface);background:var(--ink);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.rich-content mark,.student-rich-text mark{padding:1px 2px;border-radius:3px;background:var(--apricot)}.lesson-preview-backdrop{position:fixed;z-index:60;inset:0;display:grid;place-items:center;padding:18px;background:rgb(8 5 11/50%);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.lesson-preview{width:min(760px,100%);max-height:calc(100dvh - 32px);display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden;border-radius:var(--radius-panel);background:var(--canvas);box-shadow:var(--shadow)}.lesson-preview>footer,.lesson-preview>header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;background:var(--surface)}.lesson-preview>footer>div,.lesson-preview>header>div{min-width:0}.lesson-preview h2,.lesson-preview p{overflow-wrap:anywhere}.lesson-preview>footer{flex-wrap:wrap}.lesson-preview .student-submit{margin-top:0}.student-answer-fields{border:0;padding:0;margin:0;min-width:0}.student-answer-fields:disabled button,.student-answer-fields:disabled input,.student-answer-fields:disabled textarea{cursor:not-allowed}.student-guidance{display:grid;justify-items:start;gap:8px;margin-top:12px}.student-hint-toggle{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-control);color:var(--ink);background:var(--surface);font:inherit;font-weight:650;cursor:pointer}.student-hint{margin:0;padding:12px 14px;border-inline-start:4px solid var(--warning);border-radius:10px;background:color-mix(in srgb,var(--apricot) 28%,var(--surface));line-height:1.55;overflow-wrap:anywhere}.student-explanation{display:grid;gap:5px;margin-top:12px;padding:14px;border:1px solid var(--border);border-radius:var(--radius-control);background:color-mix(in srgb,var(--rose) 15%,var(--surface));overflow-wrap:anywhere}.student-explanation p{margin:0;line-height:1.55}.student-material-error{display:grid;gap:12px;color:var(--danger)}.student-material-error p{margin:0}.student-material-error button{justify-self:start;white-space:normal;text-align:start}.student-document{margin:0;display:grid;gap:12px}.student-document iframe{display:block;width:100%;min-height:420px;border:1px solid var(--border);border-radius:12px}.student-document a{justify-self:start}.student-material-placeholder{display:grid;align-content:start;min-width:0;border-radius:16px;background:var(--surface-muted);padding:var(--space-16)}.student-material-placeholder p{margin:0}.student-material-placeholder-visual{width:100%;aspect-ratio:16/9;max-height:460px}.student-material-placeholder-audio{min-height:3.5rem}.student-material-placeholder-document{min-height:420px}.student-media-image-frame{position:relative;width:100%;aspect-ratio:16/9;max-height:460px;min-width:0}.student-media .student-media-image-frame>img{display:block;height:100%}.student-media-image-status{position:absolute;top:var(--space-16);left:var(--space-16);right:var(--space-16);margin:0;padding:var(--space-8) var(--space-12);border-radius:var(--radius-control);color:var(--ink-muted);background:var(--surface)}.student-course-section{margin:24px 0}.student-course-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));gap:16px;margin-top:16px}.student-course-cards article{display:flex;flex-direction:column;gap:var(--space-16);padding:var(--space-24);min-width:0;border:1px solid var(--border);border-radius:20px;background:var(--surface);overflow-wrap:anywhere}.student-course-cards h3{margin:0 0 6px;font-size:20px}.student-course-cards p{margin:0;line-height:1.5}.student-course-cards progress{display:block;width:100%;height:8px;margin-top:var(--space-8);overflow:hidden;appearance:none;border:0;border-radius:var(--radius-pill);background:var(--surface-muted);accent-color:var(--ink)}.student-course-cards progress::-webkit-progress-bar{background:var(--surface-muted);border-radius:var(--radius-pill)}.student-course-cards progress::-webkit-progress-value{background:var(--ink);border-radius:var(--radius-pill)}.student-course-cards progress::-moz-progress-bar{background:var(--ink);border-radius:var(--radius-pill)}.student-course-cards .course-next-hint{color:var(--ink-muted);font-size:14px}.student-course-cards .course-next-lesson{font-weight:650}.student-course-cards article>a,.student-course-cards button{margin-top:auto;align-self:flex-start;white-space:normal;text-align:start}.student-course-pagination-error{margin:var(--space-16) 0 var(--space-8);color:var(--danger)}.student-shell{min-height:100dvh;display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px;padding:24px}.student-sidebar{position:sticky;top:24px;height:calc(100dvh - 48px);padding:22px 14px;border-radius:24px;background:var(--surface-muted)}.student-sidebar h2{margin:10px 10px 16px;font-size:16px}.student-sidebar button,.student-sidebar>a{width:100%;gap:10px;border:0;background:transparent;text-align:start;cursor:pointer}.student-sidebar .student-subscription-nav,.student-sidebar button,.student-sidebar>a{min-height:44px;display:flex;align-items:center;margin-bottom:7px;padding:10px 12px;border-radius:12px;color:inherit;text-decoration:none}.student-sidebar button.active{background:white;box-shadow:0 8px 24px rgb(33 22 16/8%)}.student-sidebar button small,.student-sidebar button span{display:block}.student-sidebar button small{margin-top:3px;color:var(--ink-muted);font-size:10px}.student-sidebar .account-menu{position:absolute;inset-inline:var(--space-16);bottom:var(--space-16)}.student-sidebar .account-menu>button{width:44px;height:44px;margin:0;padding:0}.student-rich-text{line-height:1.65;white-space:normal}.student-rich-text blockquote,.student-rich-text p{white-space:pre-wrap}.student-rich-text p{margin:.65em 0}.student-rich-text h2{margin:1em 0 .45em;font-size:1.65rem}.student-rich-text h3{margin:.9em 0 .4em;font-size:1.3rem}.student-rich-text small{font-size:.85em}.rich-content table,.student-rich-text table{border-collapse:collapse;width:100%;min-width:0;max-width:100%;table-layout:fixed;margin-block:1em}.rich-content td,.rich-content th,.student-rich-text td,.student-rich-text th{border:1px solid var(--border);padding:.75em;vertical-align:top;overflow-wrap:anywhere}.rich-content th,.student-rich-text th{background:var(--surface-muted);font-weight:700}.student-rich-text blockquote{margin:1em 0;padding:12px 16px;border-inline-start:4px solid var(--lavender);background:var(--surface-muted);border-start-end-radius:12px;border-end-end-radius:12px}.fill-gaps>p{line-height:2.8}.gap-slot{min-width:110px;margin:0 5px;padding:7px 10px;border:1px dashed var(--ink-muted);border-radius:9px;background:var(--surface)}.drag-items{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.drag-items>button,.drag-items>span{display:inline-flex;width:auto;align-items:center;gap:5px;padding:8px 11px;border:1px solid var(--border);border-radius:10px;background:var(--mint)}.drag-items>button.selected{outline:3px solid var(--lavender)}.interactive-game-task{position:relative;display:grid;gap:14px;padding:20px;border:1px solid var(--border);border-radius:20px;background:radial-gradient(circle at calc(100% - 24px) 20px,transparent 32px,color-mix(in srgb,var(--lavender) 58%,transparent) 32px 46px,transparent 46px),linear-gradient(145deg,var(--surface) 0,var(--surface-muted) 100%)}.interactive-game-task>legend{position:relative;z-index:1;padding-inline:7px;font-size:clamp(18px,2.5vw,24px);font-weight:800}.interactive-game-task>p{position:relative;z-index:1;margin:0;max-width:72ch;color:var(--ink-muted);font-size:14px;line-height:1.5}.game-task-header{position:relative;z-index:1;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px}.game-task-header>span{display:inline-flex;width:max-content;padding:5px 10px;border:1px solid var(--border);border-radius:999px;background:var(--mint);font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase}.game-task-header>strong{color:var(--ink-muted);font-size:13px}.sortable-list{display:grid;gap:8px;margin:0;padding:0;list-style:none}.sortable-list-item{display:flex;align-items:stretch;min-width:0;touch-action:pan-y;border-radius:12px;background:var(--surface-muted);box-shadow:0 1px 2px rgb(8 5 11/8%)}.sortable-list-item.is-dragging{box-shadow:0 16px 38px rgb(8 5 11/18%)}.sortable-list.is-dragging .sortable-list-item.is-dragging>button,.sortable-list.is-dragging .sortable-list-item:not(.is-dragging){pointer-events:none}.sortable-drag-handle{flex:0 0 42px;border:0;border-inline-end:1px solid var(--border);border-start-start-radius:12px;border-end-start-radius:12px;color:var(--ink-muted);background:transparent;font:700 16px/1 system-ui;cursor:grab;touch-action:none}.sortable-drag-handle:active{cursor:grabbing}.sortable-drag-handle:focus-visible{position:relative;z-index:1;outline:3px solid var(--lavender);outline-offset:-3px}.sortable-content{flex:1 1;min-width:0}.sortable-content>button{display:flex;align-items:center;gap:9px;width:100%;min-width:0;padding:11px 12px;border:1px solid var(--border);border-start-end-radius:12px;border-end-end-radius:12px;color:var(--ink);background:var(--surface-muted);font:inherit;text-align:start}.sortable-content>button.selected{outline:3px solid var(--lavender);background:var(--surface)}.sortable-content>button span{overflow-wrap:anywhere}.course-lesson-sortable .sortable-content{display:flex}.course-lesson-sortable .sortable-drag-handle{flex-basis:44px;min-width:44px}.matching-columns{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;align-items:start}.matching-columns>div:first-child{display:grid;gap:8px}.matching-columns>div:first-child span{display:flex;align-items:center;gap:9px;min-height:43px;padding:11px 12px;border:1px solid var(--border);border-radius:12px;background:var(--apricot);overflow-wrap:anywhere}.matching-columns>div:first-child small{display:grid;flex:none;width:24px;height:24px;place-items:center;border-radius:50%;background:var(--surface);font-weight:800}.classification-bank{display:grid;gap:10px;padding:14px;border:1px dashed var(--ink-muted);border-radius:16px;background:var(--surface)}.classification-bank>div,.classification-zone>div{display:flex;flex-wrap:wrap;gap:8px;min-height:44px}.classification-bank button,.classification-zone>div button{width:auto;padding:9px 13px;border:1px solid var(--border);border-radius:12px;color:var(--ink);background:var(--apricot);font:inherit;cursor:grab}.classification-bank button.selected,.classification-zone>div button.selected{outline:3px solid var(--focus);outline-offset:2px;background:var(--mint)}.classification-zones{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(220px,100%),1fr));gap:12px}.classification-zone{display:grid;align-content:start;gap:11px;min-width:0;padding:14px;border:1px solid var(--border);border-radius:16px;background:var(--surface)}.classification-zone h3{margin:0;font-size:16px;overflow-wrap:anywhere}.classification-drop-target{width:100%;min-height:48px;padding:9px 12px;border:2px dashed var(--ink-muted);border-radius:12px;color:var(--ink);background:var(--lavender);font:inherit;font-weight:750}.classification-drop-target:disabled{color:var(--ink-muted);background:var(--surface-muted);cursor:not-allowed}.student-main{width:min(1040px,100%);margin:0 auto;padding:16px 8px 80px}.student-overview{display:grid;gap:24px;min-width:0}.error-review-page{display:grid;gap:20px;min-width:0}.error-review-page>header{padding:28px;border-radius:16px;background:var(--surface-muted)}.error-review-page>header h1{margin:6px 0 10px;font-size:clamp(30px,5vw,36px);line-height:1.15;letter-spacing:-.045em}.error-review-page>header p{max-width:700px;margin:0;color:var(--ink-muted);line-height:1.5}.error-review-practice-hint{display:flex;align-items:center;gap:10px;margin:0}.error-review-practice-hint svg{flex:none}.error-review-actions{display:flex;flex-wrap:wrap;gap:10px}.error-review-list,.error-review-tasks{display:grid;gap:18px;min-width:0}.error-review-card{min-width:0;overflow:hidden;border:1px solid var(--border);border-radius:22px;background:var(--surface)}.error-review-card>header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:20px 22px;border-bottom:1px solid var(--border);background:var(--surface-muted)}.error-review-card>header h2,.error-review-card>header p{margin:0}.error-review-card>header p{margin-top:5px;color:var(--ink-muted);overflow-wrap:anywhere}.error-review-card>header>strong{flex:none}.error-review-tasks{padding:20px}.error-review-task{min-width:0;padding:18px;border:1px solid var(--border);border-radius:17px}.error-review-task>.student-course-block{margin-top:0;padding:0;border:0;border-radius:0;background:transparent}.error-review-task>.student-explanation{margin:0 0 14px}.error-review-task>.primary-button{margin-top:14px}.error-review-state{display:flex;align-items:flex-start;gap:14px;min-height:150px;padding:24px;border:1px dashed var(--border);border-radius:20px;background:var(--surface)}.error-review-state>svg{flex:none}.error-review-state>div{display:grid;justify-items:start;gap:10px}.error-review-state p{margin:0;color:var(--ink-muted)}.student-overview .section-heading{flex-wrap:wrap}.student-overview .activity-list>.empty-state{margin:0 16px 16px}.student-main>header,.student-overview>header{padding:28px;border-radius:16px;background:var(--surface-muted)}.student-main>header h1,.student-overview>header h1{margin:6px 0 10px;font-size:clamp(30px,5vw,36px);line-height:1.15;letter-spacing:-.045em}.student-main>header p,.student-overview>header p{max-width:650px;margin:0;color:var(--ink-muted);font-size:16px;line-height:1.5}.student-overview>header{margin-bottom:16px}.student-result{display:flex;align-items:center;gap:14px;margin-top:16px;padding:18px 22px;border-radius:18px;background:var(--mint)}.student-result span,.student-result strong{display:block}.student-result.correct{background:var(--success-surface)}.student-result.incorrect{background:var(--danger-surface)}.student-result.completed{background:var(--surface-muted)}.student-result>svg{flex-shrink:0}.student-answer-feedback{justify-content:flex-start;font-size:14px;font-weight:600}.student-result strong{font-size:25px}.student-lesson-nav{display:flex;gap:8px;overflow-x:auto;margin-top:16px;padding:4px}.student-lesson-nav button{flex:0 0 auto;padding:9px 12px;border:1px solid var(--border);border-radius:12px;background:white;cursor:pointer}.student-lesson-nav button.active{color:white;background:var(--ink)}.student-lesson-nav button:disabled{opacity:.55;cursor:not-allowed}.student-lessons{display:grid;gap:18px;margin-top:20px}.student-lesson{padding:24px;border:1px solid var(--border);border-radius:24px;background:white}.student-teacher-feedback{display:grid;gap:6px;margin-top:10px;font-size:15px;line-height:1.5}.student-teacher-feedback>p{margin:0}.student-lesson-heading{display:flex;align-items:center;gap:12px;margin-bottom:20px}.student-lesson-heading>span{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:var(--apricot);font-weight:700}.student-lesson-heading h2{margin:0}.student-course-block{margin-top:12px;padding:18px;border:1px solid var(--border);border-radius:17px;line-height:1.65}.student-course-block.correct{border-color:var(--success);background:var(--success-surface)}.student-course-block.incorrect{border-color:var(--danger);background:var(--danger-surface)}.student-series{padding:clamp(18px,3vw,28px);background:linear-gradient(135deg,var(--surface) 62%,color-mix(in srgb,var(--brand-primary-soft) 55%,var(--surface)))}.student-series-heading{display:flex;align-items:start;justify-content:space-between;gap:16px}.student-series-heading h3{margin:0 0 14px;font-size:clamp(23px,3vw,34px);line-height:1.15;letter-spacing:-.035em;overflow-wrap:anywhere}.student-series-heading>strong{flex:none;padding:7px 11px;border-radius:999px;background:var(--surface);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-size:14px}.lesson-stage-progress{margin:1rem 0 1.5rem;padding:1rem 1.25rem;border:1px solid var(--border);border-radius:1rem;background:var(--surface)}.lesson-stage-progress-label{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.7rem;color:var(--ink-muted)}.lesson-stage-progress-label strong{color:var(--ink);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;white-space:nowrap}.lesson-stage-progress-track{height:.65rem;overflow:hidden;border-radius:999px;background:var(--surface-muted)}.lesson-stage-progress-track>span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--brand-primary),var(--brand-secondary));transition:width .24s ease}@media (prefers-reduced-motion:reduce){.lesson-stage-progress-track>span{transition:none}}.student-series-stage{display:grid;align-content:start;min-height:390px;gap:14px;margin-top:22px;padding:clamp(16px,2.4vw,24px);border:1px solid var(--border);border-radius:20px;background:var(--surface)}.student-series-position{color:var(--ink-muted);font-size:13px;font-weight:700}.student-series-position:focus-visible{width:fit-content;border-radius:var(--radius-small);outline:2px solid var(--focus);outline-offset:3px}.student-series-stage fieldset{min-width:0}.student-series-stage legend{font-size:clamp(20px,2.5vw,28px);line-height:1.25}.student-series-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.student-series-options label{min-height:58px;border:1px solid var(--border);background:var(--surface)}.student-series-options label.selected{border-color:var(--brand-primary);background:var(--brand-primary-soft)}.student-series-stage .form-field>span{font-size:clamp(20px,2.5vw,28px);font-weight:700}.student-series-stage .form-field input{width:100%;min-height:54px;padding:10px 14px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--ink)}.student-series-flash{display:grid;gap:10px}.student-series-flash>button{display:grid;place-items:center;gap:12px;width:100%;min-height:160px;padding:22px;border:1px solid var(--border);border-radius:18px;background:var(--brand-primary-soft);cursor:pointer;text-align:center}.student-series-flash>button.revealed{background:var(--mint)}.student-series-flash>button span{font-size:clamp(22px,3vw,34px);font-weight:750;overflow-wrap:anywhere}.student-series-flash>button small{color:var(--ink-muted)}.student-series-feedback,.student-series-guidance{min-height:36px;overflow-wrap:anywhere}.student-series-feedback p,.student-series-guidance p{margin:0}.student-series-feedback{min-height:54px}.student-series-feedback .text-button{min-height:44px;padding:0 2px;border:0;background:transparent;color:var(--brand-primary);font-weight:700;text-decoration:underline;cursor:pointer}.student-series-recovery{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-8) var(--space-16)}.student-series-recovery p{margin:0}.student-series-recovery .text-button{min-height:44px;padding:0;border:0;background:transparent;color:var(--brand-primary-action);font:inherit;font-weight:700;text-decoration:underline;cursor:pointer}.student-series-actions{display:flex;justify-content:space-between;gap:12px;margin-top:auto}@media (max-width:600px){.student-series-heading{align-items:center}.student-series-options{grid-template-columns:1fr}.student-series-stage{min-height:0}.student-series-actions>button{flex:1 1}}@media (max-width:400px){.student-series-actions{gap:8px}.student-series-actions>button{min-width:0;padding-inline:8px;white-space:nowrap;font-size:13px}}.student-course-block fieldset{display:grid;gap:9px;margin:0;padding:0;border:0}.student-course-block legend{margin-bottom:12px;font-weight:700}.student-course-block label{display:flex;gap:9px;align-items:center;padding:10px;border-radius:11px;background:var(--surface-muted);cursor:pointer}.student-course-block label>span,.student-course-block legend,.student-lesson-heading h2,.student-main>header h1{min-width:0;overflow-wrap:anywhere}.student-course-block .form-field{display:grid;padding:0;background:transparent;cursor:default}.student-course-block .form-field textarea{width:100%;min-height:110px;padding:12px;border:1px solid var(--border);border-radius:12px;background:var(--canvas);color:var(--ink);font:inherit}.student-course-block .form-field textarea:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.student-submit{margin-top:20px}.student-lesson-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.student-empty{margin-top:20vh;text-align:center;color:var(--ink-muted)}.student-empty .student-lesson-actions{justify-content:center}@media (max-width:760px){.student-shell{display:block;padding:10px}.student-sidebar{position:static;height:auto;padding:12px;border-radius:20px}.student-sidebar .brand-mark{display:none}.student-sidebar h2{margin:4px 4px 12px}.student-sidebar .account-menu{position:static;margin-top:12px}.student-main{padding:12px 2px 60px}.student-main>header,.student-overview>header{padding:22px 18px;border-radius:16px}.error-review-page>header{padding:22px 18px}.error-review-card>header{display:grid;gap:10px;padding:18px}.error-review-tasks{padding:12px}.error-review-task{padding:14px}}@media (max-width:480px){.error-review-page>header{padding-inline:0;background:transparent}.error-review-state{flex-direction:column;padding:var(--space-12)}.error-review-state>div{min-width:0}}.sample-lesson-blocks .student-course-block{padding:20px;border:1px solid var(--border);border-radius:16px;background:var(--surface)}.sample-lesson-page .student-answer-fields,.sample-lesson-page .student-course-block{min-width:0;min-inline-size:0}.lesson-preview>header{border-bottom:1px solid var(--border)}.lesson-preview>header h2{margin:4px 0 0;font-size:28px;letter-spacing:-.04em}.lesson-preview-body{display:grid;gap:16px;overflow:auto;padding:24px}@media (max-width:640px){.lesson-preview-body,.lesson-preview>footer,.lesson-preview>header{padding:16px}.lesson-preview .student-course-block{padding:12px}}.student-block{position:relative;padding:22px 22px 22px 58px;border:1px solid var(--border);border-radius:20px;background:white}.student-block-number{position:absolute;top:20px;inset-inline-start:18px;display:grid;place-items:center;width:25px;height:25px;border-radius:50%;background:var(--lavender);font-size:11px;font-weight:700}.student-rich-text{font-size:14px;line-height:1.7}.student-rich-text>:first-child{margin-top:0}.student-rich-text>:last-child{margin-bottom:0}.student-block fieldset{display:grid;gap:9px;margin:0;padding:0;border:0}.student-block legend{margin-bottom:14px;font-size:18px;font-weight:700}.student-block fieldset label{display:flex;align-items:center;gap:10px;padding:12px;border:1px solid var(--border);border-radius:13px;cursor:pointer}.student-block fieldset label:hover{border-color:var(--ink)}.lesson-preview>footer{border-top:1px solid var(--border);color:var(--ink-muted);font-size:11px}.student-media{display:grid;gap:10px;margin:0}.media-preview,.student-media img,.student-media video{width:100%;height:auto;aspect-ratio:16/9;max-height:460px;border-radius:16px;object-fit:contain;background:var(--surface-muted)}.student-media audio{display:block;width:100%;height:3.5rem;min-height:44px}.student-media figcaption{color:var(--ink-muted);font-size:14px}.student-embed-video{display:grid;gap:10px;margin:0}.student-embed-video iframe{display:block;width:100%;aspect-ratio:16/9;min-height:240px;border:0;border-radius:16px;background:var(--ink)}.student-embed-video figcaption{color:var(--ink-muted);font-size:14px}.countdown-timer,.timed-lesson-start{border:1px solid var(--border);border-radius:20px;padding:18px}.timed-lesson-start{margin:20px 0;background:var(--lavender)}.timed-lesson-start .primary-button{margin-top:12px}.countdown-timer{display:inline-flex;align-items:center;gap:10px;margin:16px 0;background:var(--surface)}.countdown-timer strong{font-size:20px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.countdown-timer.urgent{color:var(--danger);border-color:var(--danger);background:var(--danger-surface)}.autosave-status{margin:12px 0 0;color:var(--ink-muted);font-size:12px}.autosave-status.saved{color:var(--success)}.autosave-status.error{color:var(--danger)}.gap-options{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.gap-options button{min-height:44px;padding:0 14px;border:1px solid var(--border);border-radius:12px;background:var(--mint);color:var(--ink);font:inherit;font-size:14px;cursor:pointer}.gap-options button:hover{border-color:var(--ink)}.gap-options button:disabled{opacity:.45;cursor:not-allowed}@media (max-width:640px){.student-overview .section-heading>.form-field{width:100%}}@media (max-width:480px){.students-list article>span:not(.student-avatar){display:none}.matching-columns{grid-template-columns:1fr}}.student-course-block,.student-lesson{min-width:0}.lesson-preview{overflow-wrap:anywhere}.lesson-preview>header>button{flex:0 0 44px;width:44px;height:44px;min-width:44px}.student-sidebar{display:flex;flex-direction:column;gap:8px;overflow-y:auto}.student-sidebar .account-menu{position:static;margin-top:auto}.student-sidebar button>svg,.student-sidebar>button{flex-shrink:0}.student-sidebar button>span{min-width:0;overflow-wrap:anywhere}.student-lesson-heading>span{flex-shrink:0}.student-lesson-nav button{max-width:min(320px,100%);white-space:normal}.student-order-history-controls{display:flex;align-items:end;flex-wrap:wrap;gap:10px}.student-order-history-controls .form-field{min-width:160px}.student-order-history article{grid-template-columns:minmax(0,1fr) auto auto}.student-order-history article>.secondary-button{min-width:132px}.student-order-history .activity-list-error{border-top:1px solid var(--border)}.student-detail-lessons{display:grid;gap:16px}.student-detail-lessons article{display:grid;gap:8px;padding:16px;border:1px solid var(--border);border-radius:var(--radius-control)}.rich-content,.rich-content pre{overflow-wrap:anywhere}.rich-content pre{white-space:pre-wrap}.open-answer-attachments,.open-answer-response{display:grid;gap:var(--space-12);min-width:0}.open-answer-attachments{padding:var(--space-12);border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface)}.open-answer-attachments ul{display:grid;gap:var(--space-8);margin:0;padding:0;list-style:none}.open-answer-attachments li{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-8);overflow-wrap:anywhere}.homework-attachments{display:grid;gap:var(--space-8);padding:0;list-style:none}.homework-attachments li{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-8);overflow-wrap:anywhere}.open-answer-file-picker,:is(.open-answer-file-picker,.digital-products-workspace) .material-file-picker,:is(.open-answer-file-picker,.digital-products-workspace) .material-file-picker-row{display:grid;gap:var(--space-8);min-width:0}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-picker>strong{font-size:14px;line-height:1.4}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-trigger{display:inline-flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:var(--space-8);min-height:48px;padding:var(--space-8) var(--space-12);border:1px solid var(--brand-primary-action);border-radius:var(--radius-control);color:var(--brand-primary-action);background:var(--surface);font:inherit;font-weight:700;cursor:pointer}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-trigger>span{overflow-wrap:normal;word-break:normal}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-trigger>svg{flex:0 0 18px}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-trigger:hover:not(:disabled){background:var(--brand-primary-soft)}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-trigger:focus-visible{outline:2px solid var(--focus);outline-offset:2px}:is(.open-answer-file-picker,.digital-products-workspace) .material-file-trigger:disabled{cursor:not-allowed;opacity:.6}.open-answer-file-picker>small,:is(.open-answer-file-picker,.digital-products-workspace) .material-file-name{color:var(--ink-muted);font-size:14px;line-height:1.5;overflow-wrap:anywhere}.open-answer-recording{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-8)}.open-answer-recording small{flex-basis:100%;color:var(--ink-muted)}.video-playback{display:grid;gap:var(--space-8);min-width:0}.video-playback>button{justify-self:start;max-width:100%;gap:var(--space-4);padding-inline:var(--space-8);white-space:normal;overflow-wrap:normal}.video-playback>button svg{flex-shrink:0}.sortable-drag-handle{flex-basis:44px;min-width:44px;min-height:44px}.student-course-block label{min-width:0;min-height:44px}.student-course-block label>input[type=checkbox],.student-course-block label>input[type=radio]{flex-shrink:0}.student-course-block label:has(>select){flex-direction:column;align-items:stretch}.student-course-block select{width:100%;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface);font:inherit}.student-course-block button{min-height:44px}.student-course-block fieldset>button{padding:12px;border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface);text-align:start}.student-course-block nav{display:flex;flex-wrap:wrap;gap:12px}.student-course-block nav a{max-width:100%}.student-course-block iframe{width:100%;max-width:100%}.student-course-block fieldset>iframe{min-height:320px;border:1px solid var(--border);border-radius:var(--radius-control)}.student-answer-feedback,.student-course-block>.form-error,.student-course-block>.security-hint{margin:12px 0 0}.student-rich-text pre{max-width:100%;overflow:auto}.flashcards-study{display:grid;gap:16px}.flashcards-study>div p{margin:5px 0 0;color:var(--ink-muted)}.flashcards-study ol{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:12px;margin:0;padding:0;list-style:none}.flashcards-study-single ol{max-width:560px;grid-template-columns:minmax(0,1fr)}.flashcards-study li{min-width:0}.flashcards-study button{width:100%;min-height:180px;display:grid;grid-template-rows:auto 1fr auto;gap:12px;padding:18px;border:1px solid var(--border);border-radius:var(--radius-card);background:var(--apricot);color:var(--ink);text-align:start;cursor:pointer;transition:transform .18s ease,background .18s ease}.flashcards-study-single button{min-height:240px;grid-template-rows:1fr auto;padding:var(--space-24);background:var(--brand-primary-soft)}@media (max-width:640px){.lesson-preview .flashcards-study-single button{min-height:150px;padding:16px}}.flashcards-study button:hover{transform:translateY(-2px)}.flashcards-study button.revealed{background:var(--mint)}.flashcards-study button em,.flashcards-study button small{color:var(--ink-muted);font-size:12px;font-style:normal}.flashcards-study button span{align-self:center;overflow-wrap:anywhere;font-size:18px;font-weight:700;line-height:1.35}.gap-options button,.gap-slot{max-width:100%}@media (max-width:760px){.student-sidebar{overflow:visible}.student-sidebar .account-menu{margin-top:12px}.student-order-history article{grid-template-columns:minmax(0,1fr)}.student-order-history article>time{grid-column:1}.student-order-history article>.secondary-button{justify-self:stretch;min-width:0}}@media (max-width:480px){.student-result{padding:16px;align-items:flex-start}.student-result strong{font-size:22px}.student-course-block{padding:12px}}.student-product-grid h2{overflow-wrap:anywhere}.student-shell:has(.student-product-library){position:relative}.student-shell:has(.student-product-library)>.screen-help-button.floating{position:absolute}.student-product-library{display:grid;gap:24px}.student-product-library>header{padding-inline-end:72px}.student-product-grid{display:grid;gap:14px}.student-product-grid article{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:18px;padding:20px;border:1px solid var(--border);border-radius:var(--radius-card);background:var(--surface)}.student-product-copy{min-width:0}.student-product-grid article p{color:var(--ink-muted)}.student-product-grid article p,.student-product-grid article small{overflow-wrap:anywhere}.student-product-actions{display:grid;grid-column:1/-1;min-width:0;justify-items:start;gap:8px}.student-product-actions .primary-button,.student-product-actions .secondary-button{max-width:100%;white-space:normal}.student-product-actions .form-error{margin:0}.student-product-load-error{display:grid;justify-items:start;gap:12px;padding:20px;border:1px solid var(--danger);border-radius:var(--radius-card);background:var(--surface)}.student-product-load-error p{margin:0}@media (max-width:760px){.student-product-grid article{grid-template-columns:auto minmax(0,1fr)}.student-product-grid article>:last-child{grid-column:1/-1;justify-self:start}}@media (max-width:480px){.student-product-grid article{grid-template-columns:minmax(0,1fr)}}.student-course-block fieldset>.external-service-frame{display:block;width:100%;max-width:500px;height:auto;min-height:0;aspect-ratio:500/380;border:1px solid var(--border);border-radius:var(--radius-control)}.block-footer-text,.block-header-text{white-space:pre-wrap;overflow-wrap:anywhere;font-family:var(--font-sans)}.student-course-block>.block-header-text{margin:0 0 12px;color:var(--ink);font-size:1rem;font-weight:600;line-height:1.5}.student-course-block>.block-footer-text{margin:12px 0 0;color:var(--ink-muted);font-size:.875rem;font-weight:400;line-height:1.45}.student-product-pagination{display:grid;justify-items:start;gap:var(--space-8);margin-top:var(--space-16)}@media (max-width:640px){.student-course-cards article{padding:var(--space-16)}.student-shell{padding-inline:var(--space-16)}.student-main{padding-inline:0}}.gap-sentence{white-space:pre-wrap;line-height:2.8}.gap-direct{display:inline-block;max-width:100%;min-height:44px;margin-inline:5px;padding:7px 10px;border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface);color:var(--ink);font:inherit;line-height:1.5;vertical-align:middle}.gap-direct-input{width:clamp(130px,28vw,220px)}.student-course-block .gap-direct-select{width:clamp(140px,25vw,180px);height:44px;padding-block:0;line-height:normal}.gap-direct:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.fill-gaps .gap-slot,.gap-options button{min-height:44px;min-width:44px}.fill-gaps .gap-slot[aria-pressed=true],.gap-options button[aria-pressed=true]{outline:2px solid var(--focus);outline-offset:2px;background:var(--lavender)}.fill-gaps>.field-hint{line-height:1.5;margin:0}.instruction-callout{display:grid;gap:var(--space-8);padding:var(--space-20);border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface-muted);color:var(--ink)}.instruction-callout[data-tone=INFO]{background:var(--lavender)}.instruction-callout[data-tone=WARNING]{background:var(--apricot)}.instruction-callout[data-tone=SUCCESS]{background:var(--mint)}.instruction-callout .student-rich-text>:last-child{margin-bottom:0}.student-course-block[data-material-accent=mint]{--material-accent:var(--mint)}.student-course-block[data-material-accent=lavender]{--material-accent:var(--lavender)}.student-course-block[data-material-accent=apricot]{--material-accent:var(--apricot)}.student-course-block[data-material-accent=rose]{--material-accent:var(--rose)}.student-course-block[data-material-accent]:not(.correct):not(.incorrect){border-radius:var(--radius-card);background:linear-gradient(180deg,color-mix(in srgb,var(--material-accent) 13%,var(--surface)),var(--surface) 112px);box-shadow:var(--shadow-raised)}.student-course-block[data-material-accent] .student-rich-text{font-size:16px;line-height:1.7}.student-course-block[data-material-accent] .student-document,.student-course-block[data-material-accent] .student-embed-video,.student-course-block[data-material-accent] .student-media{min-width:0}.student-course-block[data-practice-accent=mint]{--practice-accent:var(--mint)}.student-course-block[data-practice-accent=lavender]{--practice-accent:var(--lavender)}.student-course-block[data-practice-accent=apricot]{--practice-accent:var(--apricot)}.student-course-block[data-practice-accent=rose]{--practice-accent:var(--rose)}.student-course-block[data-activity-accent=mint]{--practice-accent:var(--mint)}.student-course-block[data-activity-accent=lavender]{--practice-accent:var(--lavender)}.student-course-block[data-activity-accent=apricot]{--practice-accent:var(--apricot)}.student-course-block[data-activity-accent],.student-course-block[data-practice-accent]{min-width:0;padding:clamp(18px,2.5vw,28px);border-radius:var(--radius-card);box-shadow:var(--shadow-raised)}.student-course-block[data-activity-accent]:not(.correct):not(.incorrect),.student-course-block[data-practice-accent]:not(.correct):not(.incorrect){background:linear-gradient(180deg,color-mix(in srgb,var(--practice-accent) 12%,var(--surface)),var(--surface) 132px)}.student-block-kind-heading{display:flex;align-items:center;gap:var(--space-12);min-width:0;margin-bottom:var(--space-20);padding-bottom:var(--space-16);border-bottom:1px solid var(--border);line-height:1.35}.student-block-kind-icon{display:grid;flex:0 0 44px;place-items:center;width:44px;height:44px;border-radius:var(--radius-control);color:var(--ink);background:var(--practice-accent)}.student-block-kind-heading>span:last-child{display:grid;min-width:0;gap:var(--space-4)}.student-block-kind-heading strong{font-size:15px;overflow-wrap:anywhere}.student-block-kind-heading small{color:var(--ink-muted);font-size:13px;overflow-wrap:anywhere}.student-course-block[data-practice-accent]>.student-answer-fields>.form-field>span,.student-course-block[data-practice-accent]>.student-answer-fields>fieldset>legend{margin-bottom:var(--space-12);color:var(--ink);font-size:clamp(19px,2.4vw,25px);font-weight:750;line-height:1.3;letter-spacing:-.02em}.student-course-block[data-practice-accent]>.student-answer-fields>fieldset:not(.interactive-game-task):not(.fill-gaps)>label{min-height:54px;padding:var(--space-12) var(--space-16);border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface);transition:border-color var(--motion-base) var(--motion-standard),background-color var(--motion-base) var(--motion-standard)}.student-course-block[data-practice-accent]>.student-answer-fields>fieldset:not(.interactive-game-task):not(.fill-gaps)>label:hover{border-color:var(--brand-primary-action)}.student-course-block[data-practice-accent]>.student-answer-fields>fieldset:not(.interactive-game-task):not(.fill-gaps)>label:has(input:checked){border-color:var(--brand-primary-action);background:var(--brand-primary-soft)}.student-course-block[data-practice-accent]>.student-answer-fields>fieldset:not(.interactive-game-task):not(.fill-gaps)>label:has(:focus-visible){outline:2px solid var(--focus);outline-offset:2px}.student-course-block[data-practice-accent]>.student-answer-fields>.form-field input{width:100%;min-height:52px;padding:var(--space-12) var(--space-16);border:1px solid var(--border);border-radius:var(--radius-control);color:var(--ink);background:var(--surface)}.student-course-block[data-practice-accent]>.student-answer-fields>.form-field input:focus-visible{outline:2px solid var(--focus);outline-offset:2px}@media (prefers-reduced-motion:reduce){.student-course-block[data-practice-accent]>.student-answer-fields>fieldset:not(.interactive-game-task):not(.fill-gaps)>label{transition:none}}.student-course-block[data-activity-accent]>.student-answer-fields>.form-field>span,.student-course-block[data-activity-accent]>.student-answer-fields>fieldset>legend{margin-bottom:var(--space-12);color:var(--ink);font-size:clamp(19px,2.4vw,25px);font-weight:750;line-height:1.3;letter-spacing:-.02em}.student-course-block[data-activity-accent]>.student-answer-fields>.form-field input,.student-course-block[data-activity-accent]>.student-answer-fields>.form-field textarea{width:100%;min-height:52px;padding:var(--space-12) var(--space-16);border:1px solid var(--border);border-radius:var(--radius-control);color:var(--ink);background:var(--surface);font:inherit}.student-course-block[data-activity-accent]>.student-answer-fields>.form-field textarea{min-height:160px;resize:vertical}.student-course-block[data-activity-accent]>.student-answer-fields>.form-field :is(input,textarea):focus-visible{outline:2px solid var(--focus);outline-offset:2px}.student-course-block[data-activity-accent=lavender]>.student-answer-fields>fieldset>label:not(.form-field){min-height:54px;padding:var(--space-12) var(--space-16);border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface)}.student-course-block[data-activity-accent=lavender]>.student-answer-fields>fieldset>label:not(.form-field):has(input:checked){border-color:var(--brand-primary-action);background:var(--brand-primary-soft)}.student-course-block[data-activity-accent=lavender]>.student-answer-fields>fieldset>label:not(.form-field):has(:focus-visible){outline:2px solid var(--focus);outline-offset:2px}.student-course-block[data-activity-accent] .flashcards-study-single button{min-height:220px;border-color:var(--border);background:linear-gradient(135deg,var(--mint),var(--surface) 145%);box-shadow:var(--shadow-raised)}.student-course-block[data-activity-accent] .flashcards-study-single button.revealed{background:linear-gradient(135deg,var(--lavender),var(--surface) 145%)}.student-course-block[data-activity-accent] .flashcards-study-single button:focus-visible{outline:2px solid var(--focus);outline-offset:3px}.student-course-block[data-activity-accent] .flashcards-study-single button span{font-size:clamp(20px,2.5vw,28px)}@media (prefers-reduced-motion:reduce){.student-course-block[data-activity-accent] .flashcards-study-single button{transition:none}}@media (max-width:480px){.sample-lesson-page .student-course-block{padding:var(--space-16)}.sample-lesson-page .instruction-callout{padding:12px}}.student-help-shell .student-overview{gap:var(--space-24);--student-course-contact-gap:var(--space-16);--student-course-contact-padding:var(--space-8) var(--space-16)}.student-help-shell .student-overview>header{margin-bottom:0;padding:var(--space-24)}.student-help-shell .student-overview>header h1{margin:var(--space-8) 0}.student-help-shell .student-overview>.student-lesson-actions{gap:var(--space-16);margin:0}.student-help-shell .student-overview>.student-course-section{display:grid;gap:var(--space-16);margin:0}.student-help-shell .student-overview>.student-course-section>h2{margin:0}.student-help-shell .student-overview>.student-course-section>.empty-state{margin:0;padding:var(--space-16)}.student-help-shell .student-overview .student-course-cards{gap:var(--space-16);margin-top:0}.student-help-shell .student-overview .student-course-cards article{margin:0;padding:var(--space-24)}.student-help-shell .student-overview .student-course-cards .content-cover:not(:has(img)){width:72px;aspect-ratio:4/3}.student-help-shell .student-overview .student-course-cards :is(h3,p,a){-webkit-hyphens:auto;hyphens:auto;hyphenate-limit-chars:6 3 3;word-break:normal}.student-help-shell .student-overview .student-course-cards h3{margin-bottom:var(--space-8)}.student-help-shell .student-overview .activity-list .section-heading{gap:var(--space-16);margin:0;padding:var(--space-16)}.student-help-shell .student-overview .activity-list .section-heading>div:first-child{display:grid;gap:var(--space-8)}.student-help-shell .student-overview .activity-list .section-heading :is(h2,p){margin:0}.student-help-shell .student-overview .activity-list article{gap:var(--space-16);padding:var(--space-16)}.student-help-shell .student-overview .student-order-history-controls{gap:var(--space-16)}.student-help-shell .student-overview .student-order-history-controls .form-field{gap:var(--space-8);margin:0}.student-help-shell .student-overview .student-order-history-controls select{min-height:48px;height:auto;margin-top:0;padding:var(--space-8) var(--space-32) var(--space-8) var(--space-16)}.student-help-shell .student-overview .activity-list>.empty-state{margin:0 var(--space-16) var(--space-16);padding:var(--space-16)}.student-help-shell .onboarding-card{inset-inline-end:var(--space-24);bottom:var(--space-24);padding:var(--space-24)}.student-help-shell .onboarding-card-header{gap:var(--space-16);margin-bottom:var(--space-16)}.student-help-shell .onboarding-card .eyebrow{margin:0 0 var(--space-8)}.student-help-shell .onboarding-card h2{margin-bottom:var(--space-8);-webkit-hyphens:auto;hyphens:auto}.student-help-shell .onboarding-actions{flex-wrap:wrap;gap:var(--space-8);margin-top:var(--space-16)}.student-help-shell .onboarding-actions button{flex:1 0 max-content;max-width:100%;white-space:nowrap;overflow-wrap:normal;word-break:normal}@media (max-width:760px){.student-help-shell .student-overview .student-course-cards article,.student-help-shell .student-overview>header{padding:var(--space-16)}.student-help-shell .onboarding-card{inset-inline-end:var(--space-16);bottom:var(--space-16);width:calc(100vw - 32px);max-height:calc(100dvh - 32px);padding:var(--space-16)}}.scorm-player{display:grid;gap:12px;min-width:0}.scorm-player iframe{display:block;width:100%;height:clamp(360px,72vh,720px);border:1px solid var(--border);border-radius:var(--radius-control);background:var(--surface)}.series-preview-progress-switch{display:inline-flex;align-items:center;gap:.75rem;min-height:44px;margin-top:1rem;color:var(--ink)}.series-preview-progress-switch input{width:1.15rem;height:1.15rem;accent-color:var(--brand-primary-action)}.pdf-document-preview{height:200px;overflow-y:auto;overflow-x:hidden;border:1px solid var(--border);border-radius:12px;padding:8px}.pdf-document-preview figure{margin:0 0 8px}.pdf-document-preview img{display:block;width:100%;height:auto}.pdf-document-preview:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.external-service-frame{display:block;width:100%;max-width:500px;height:auto;min-height:0;aspect-ratio:500/380;border:1px solid var(--border);border-radius:var(--radius-control)}