._panel_i4bnp_1{border:1px solid var(--ui-border);border-radius:var(--ui-radius-lg);background:var(--ui-surface);color:var(--ui-text);padding:28px;font-size:16px;line-height:1.7}._panel_i4bnp_1 h2{margin:4px 0 16px;font-size:28px}._panel_i4bnp_1 h3{font-size:20px}._panel_i4bnp_1 header p{color:var(--ui-brand-strong);margin:0}._consent_i4bnp_5{background:var(--ui-surface-soft);border-radius:var(--ui-radius-sm);align-items:flex-start;gap:12px;padding:16px;display:flex}._consent_i4bnp_5 input{height:24px;accent-color:var(--ui-brand);flex:0 0 24px;margin-top:3px}._actions_i4bnp_7{flex-wrap:wrap;gap:12px;margin:20px 0 12px;display:flex}._panel_i4bnp_1 button,._panel_i4bnp_1 a,._panel_i4bnp_1 summary{min-height:44px}._panel_i4bnp_1 button{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);background:var(--ui-surface);color:var(--ui-text);font:inherit;cursor:pointer;padding:10px 18px;font-weight:700}._panel_i4bnp_1 ._primary_i4bnp_10{background:var(--ui-brand);color:var(--ui-text-on-brand);border-color:var(--ui-brand)}._panel_i4bnp_1 button:disabled{opacity:.55;cursor:not-allowed}._panel_i4bnp_1 a{color:var(--ui-brand-strong);text-underline-offset:4px;overflow-wrap:anywhere;align-items:center;text-decoration:underline;display:inline-flex}._panel_i4bnp_1 :is(a,button,input,summary):focus-visible{outline:3px solid var(--ui-focus);outline-offset:3px}._note_i4bnp_14{color:var(--ui-text-muted);font-size:14px}._message_i4bnp_15,._warning_i4bnp_15{background:var(--ui-info-soft);border-radius:var(--ui-radius-sm);padding:16px}._result_i4bnp_16{border-top:1px solid var(--ui-border);margin-top:24px;padding-top:16px}._list_i4bnp_17{padding:0;list-style:none}._list_i4bnp_17 li{flex-wrap:wrap;align-items:center;gap:12px;padding:8px 0;display:flex}._panel_i4bnp_1 summary{cursor:pointer;padding-top:12px}._localTools_i4bnp_20{border-bottom:1px solid var(--ui-border);margin-bottom:20px;padding-bottom:20px}._localTools_i4bnp_20 label{flex-direction:column;gap:8px;display:flex}._localTools_i4bnp_20 input{box-sizing:border-box;width:100%;max-width:360px;min-height:44px;font:inherit;color:var(--ui-text);background:var(--ui-surface);border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);padding:10px 14px}._poster_i4bnp_23{max-width:400px;margin:20px 0}._poster_i4bnp_23 img{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);width:100%;height:auto}._poster_i4bnp_23 figcaption{color:var(--ui-text-muted);margin:8px 0;font-size:14px}@media (width<=600px){._panel_i4bnp_1{padding:20px}._actions_i4bnp_7{flex-direction:column;align-items:stretch}}._lesson_1gfw4_1{box-sizing:border-box;width:100%;max-width:none;padding:calc(var(--ui-header-height) + 36px) clamp(24px, 2.5vw, 40px) 72px;color:var(--ui-text);margin:auto;font-size:16px;line-height:1.8}._back_1gfw4_2{color:var(--ui-text-muted)}._hero_1gfw4_3{grid-template-columns:1.4fr 1fr;align-items:center;gap:40px;padding:36px 0;display:grid}._hero_1gfw4_3 h1{margin:8px 0 18px;font-size:clamp(32px,4vw,54px);line-height:1.3}._hero_1gfw4_3 aside{background:var(--ui-brand-soft);border-radius:var(--ui-radius-lg);padding:28px}._hero_1gfw4_3 small,._hint_1gfw4_6{color:var(--ui-text-muted);font-size:14px}._eyebrow_1gfw4_7{color:var(--ui-brand-strong);font-size:14px;font-weight:800}._tags_1gfw4_8,._toolbar_1gfw4_8,._answers_1gfw4_8,._next_1gfw4_8{flex-wrap:wrap;gap:12px;display:flex}._tags_1gfw4_8{margin:20px 0}._tags_1gfw4_8 span{background:var(--ui-surface-soft);border:1px solid var(--ui-border);border-radius:20px;padding:4px 14px;font-size:14px}._lesson_1gfw4_1 button,._workbench_1gfw4_11 button,._toolbar_1gfw4_8 a,._next_1gfw4_8 a{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);background:var(--ui-surface);min-height:44px;color:var(--ui-text);font:inherit;cursor:pointer;padding:10px 18px;font-weight:700}._hero_1gfw4_3 button,._section_1gfw4_12>button,._gamePoster_1gfw4_12 button{background:var(--ui-brand);color:var(--ui-text-on-brand);border-color:var(--ui-brand)}._lesson_1gfw4_1 button:hover,._next_1gfw4_8 a:hover{border-color:var(--ui-brand)}:is(._lesson_1gfw4_1,._workbench_1gfw4_11) :is(a,button,input):focus-visible{outline:3px solid var(--ui-focus);outline-offset:4px}._lesson_1gfw4_1 button[aria-pressed=true]{border-color:var(--ui-brand);background:var(--ui-brand-soft)}._contents_1gfw4_16{background:var(--ui-surface);border:1px solid var(--ui-border);border-radius:var(--ui-radius-md);flex-wrap:wrap;gap:20px;padding:20px;display:flex}._contents_1gfw4_16 a{padding:6px;font-weight:700}._section_1gfw4_12{scroll-margin-top:calc(var(--ui-header-height) + 20px);background:var(--ui-surface);border:1px solid var(--ui-border);border-radius:var(--ui-radius-lg);box-shadow:var(--ui-shadow-sm);margin-top:28px;padding:32px}._section_1gfw4_12 h2{margin:4px 0 16px;font-size:clamp(25px,3vw,34px);line-height:1.4}._section_1gfw4_12 h3{margin-top:28px;font-size:20px}._toolbar_1gfw4_8{margin:20px 0}._editor_1gfw4_22{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);width:100%;height:740px}._gamePoster_1gfw4_12{background:var(--ui-info-soft);border-radius:var(--ui-radius-md);text-align:center;justify-items:center;padding:44px 20px;display:grid}._gamePoster_1gfw4_12>span{font-size:76px}._section_1gfw4_12 video{aspect-ratio:16/9;background:var(--ui-text);border-radius:var(--ui-radius-md);width:100%}._review_1gfw4_26{border-left:5px solid var(--ui-brand);border-radius:var(--ui-radius-sm);background:var(--ui-brand-soft);margin:20px 0;padding:20px 22px}._review_1gfw4_26 p{margin:6px 0 0}._analysis_1gfw4_28{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding:0;list-style:none;display:grid}._analysis_1gfw4_28 li{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);background:var(--ui-surface-soft);gap:14px;padding:18px;display:flex}._analysis_1gfw4_28 li>span{color:var(--ui-brand-strong);font-weight:900}._analysis_1gfw4_28 p{margin:0}._buildSteps_1gfw4_32{gap:14px;padding:0;list-style:none;display:grid}._buildSteps_1gfw4_32>li{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);grid-template-columns:44px 1fr;align-items:start;gap:16px;padding:18px;display:grid}._buildSteps_1gfw4_32>li>span{width:44px;height:44px;color:var(--ui-text-on-brand);background:var(--ui-brand);border-radius:50%;place-items:center;font-weight:900;display:grid}._buildSteps_1gfw4_32 b{font-size:18px}._buildSteps_1gfw4_32 p{color:var(--ui-text-muted);margin:4px 0 0}._feynman_1gfw4_37{border-radius:var(--ui-radius-md);background:var(--ui-info-soft);padding:18px 18px 18px 42px}._feynman_1gfw4_37 li{margin:12px 0}._checklist_1gfw4_39{gap:10px;margin-top:24px;display:grid}._checklist_1gfw4_39 label{cursor:pointer;align-items:center;gap:12px;min-height:48px;display:flex}._checklist_1gfw4_39 input{width:22px;height:22px;accent-color:var(--ui-brand)}._feedback_1gfw4_42{border-radius:var(--ui-radius-sm);background:var(--ui-info-soft);padding:18px}._quizHeader_1gfw4_43{border-top:1px solid var(--ui-border);margin-top:42px;padding-top:28px}._quizHeader_1gfw4_43 h3{margin:2px 0 6px}._quizHeader_1gfw4_43>p:last-child{color:var(--ui-text-muted)}._quizGrid_1gfw4_46{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}._quizCard_1gfw4_47{border:1px solid var(--ui-border);border-radius:var(--ui-radius-md);background:var(--ui-surface-soft);flex-direction:column;gap:12px;min-height:250px;padding:20px;display:flex}._quizCard_1gfw4_47>small{color:var(--ui-brand-strong);font-weight:900}._quizCard_1gfw4_47>b{min-height:52px;font-size:17px;line-height:1.55}._quizOptions_1gfw4_50{gap:8px;display:grid}._quizOptions_1gfw4_50 button{text-align:left;width:100%;min-height:44px;padding:8px 12px}._quizCard_1gfw4_47>p{border-radius:var(--ui-radius-sm);color:var(--ui-danger);background:color-mix(in srgb,var(--ui-danger) 10%,var(--ui-surface));margin:auto 0 0;padding:11px 13px;font-size:13px;line-height:1.55}._quizCard_1gfw4_47>p[data-correct=true]{color:var(--ui-success);background:color-mix(in srgb,var(--ui-success) 10%,var(--ui-surface))}._challenges_1gfw4_54{padding-left:25px}._challenges_1gfw4_54 li{margin:16px 0}._source_1gfw4_56{color:var(--ui-text-muted);margin-top:28px;font-size:14px}._source_1gfw4_56 summary{cursor:pointer;min-height:44px}@media (width<=760px){._lesson_1gfw4_1{padding-left:16px;padding-right:16px}._hero_1gfw4_3{grid-template-columns:1fr;gap:16px}._section_1gfw4_12{padding:20px}._editor_1gfw4_22{height:620px}._contents_1gfw4_16{gap:8px}._analysis_1gfw4_28,._quizGrid_1gfw4_46{grid-template-columns:1fr}}._workbench_1gfw4_11{min-width:0;color:var(--ui-text);font-size:16px;line-height:1.8}._tabs_1gfw4_61{gap:12px;margin:24px 0 16px;display:flex}._tabs_1gfw4_61 button{flex:1;min-width:0}._tabs_1gfw4_61 button[aria-selected=true]{background:var(--ui-brand-soft);border-color:var(--ui-brand);box-shadow:inset 0 -3px var(--ui-brand)}._panelViewport_1gfw4_64{overflow:hidden}._panelTrack_1gfw4_65{transition:transform .24s var(--ui-ease);align-items:flex-start;display:flex}._practicePanel_1gfw4_66{visibility:hidden;flex:0 0 100%;min-width:0;max-height:0;overflow:hidden}._practicePanel_1gfw4_66[aria-hidden=false]{visibility:visible;max-height:none}._practicePanel_1gfw4_66>p{margin:0 0 16px}._editor_1gfw4_22{box-sizing:border-box;display:block}._videoPending_1gfw4_70{background:var(--ui-surface-soft);border-radius:var(--ui-radius-md);padding:32px}._videoPending_1gfw4_70>span{color:var(--ui-brand);font-size:32px}._quizCard_1gfw4_47{min-width:0;margin:0}._quizCard_1gfw4_47 legend{color:var(--ui-brand-strong);padding:0 8px;font-size:14px;font-weight:800}._quizOptions_1gfw4_50 label{border:1px solid var(--ui-border);border-radius:var(--ui-radius-sm);cursor:pointer;background:var(--ui-surface);align-items:center;gap:12px;min-height:48px;padding:8px 12px;display:flex}._quizOptions_1gfw4_50 label[data-selected=true]{background:var(--ui-brand-soft);border-color:var(--ui-brand)}._quizOptions_1gfw4_50 input{accent-color:var(--ui-brand);flex-shrink:0;width:20px;height:20px}._lesson_1gfw4_1 button:disabled{opacity:.55;cursor:not-allowed}._certificate_1gfw4_78{border:2px solid var(--ui-brand);background:var(--ui-brand-soft);border-radius:var(--ui-radius-lg);margin-top:24px;padding:28px}._certificate_1gfw4_78 strong{color:var(--ui-brand-strong);font-size:40px}._certificate_1gfw4_78 small{font-size:14px}@media (width<=760px){._section_1gfw4_12{padding:18px}._tabs_1gfw4_61{gap:8px}._tabs_1gfw4_61 button{padding:10px 8px;font-size:16px}._hero_1gfw4_3{padding-top:16px}._toolbar_1gfw4_8 a{max-width:100%}}@media (prefers-reduced-motion:reduce){._panelTrack_1gfw4_65{transition:none}}._wideLayout_1gfw4_84>.shell{box-sizing:border-box;width:100%;max-width:none;padding-left:clamp(24px,2.5vw,40px);padding-right:clamp(24px,2.5vw,40px)}@media (width<=760px){._wideLayout_1gfw4_84>.shell{padding-left:16px;padding-right:16px}}._hero_1gfw4_3 ._eyebrow_1gfw4_7{color:var(--ui-subject-scratch)}._lessonHeader_1gfw4_89{max-width:960px;padding:16px 0 28px}._lessonHeader_1gfw4_89 h1{overflow-wrap:anywhere;margin:8px 0 12px;font-size:clamp(32px,4vw,54px);line-height:1.3}._lessonHeader_1gfw4_89 p{margin:8px 0}._sectionHeading_1gfw4_92{justify-content:space-between;align-items:center;gap:24px;display:flex}._sectionHeading_1gfw4_92>div{min-width:0}._sectionHeading_1gfw4_92>button{flex-shrink:0}._lesson_1gfw4_1 ._primaryButton_1gfw4_95{background:var(--ui-brand);border-color:var(--ui-brand);color:var(--ui-text-on-brand)}._answerFeedback_1gfw4_96{border:1px solid var(--ui-border);border-left:4px solid var(--ui-warning);border-radius:var(--ui-radius-sm);background:var(--ui-surface);color:var(--ui-text);margin-top:auto;padding:16px;font-size:16px;line-height:1.65}._answerFeedback_1gfw4_96[data-correct=true]{border-left-color:var(--ui-success)}._answerFeedback_1gfw4_96 p{margin:8px 0 0}._quizCard_1gfw4_47:disabled{opacity:1}._quizCard_1gfw4_47:disabled label{cursor:default}._quizCard_1gfw4_47 :is(b,p,span){overflow-wrap:anywhere}@media (width<=760px){._sectionHeading_1gfw4_92{flex-direction:column;align-items:flex-start;gap:12px}._sectionHeading_1gfw4_92>button{width:100%}._contents_1gfw4_16 a{align-items:center;min-height:44px;display:flex}}._videoPlaceholder_1gfw4_103{background:var(--ui-surface-soft);border-radius:var(--ui-radius-md);grid-template-columns:minmax(200px,480px) minmax(0,1fr);align-items:center;gap:32px;padding:24px;display:grid}._videoPlaceholder_1gfw4_103 img{aspect-ratio:4/3;object-fit:contain;border-radius:var(--ui-radius-sm);width:100%;height:auto;display:block}._videoPlaceholder_1gfw4_103 a{min-height:44px;color:var(--ui-brand-strong);align-items:center;font-weight:700;display:inline-flex}@media (width<=760px){._videoPlaceholder_1gfw4_103{grid-template-columns:1fr;gap:16px;padding:16px}}._videoGuide_1gfw4_107{margin-top:16px}._videoGuide_1gfw4_107 summary{cursor:pointer;min-height:44px;padding:8px 0;font-weight:700;display:list-item}._videoGuide_1gfw4_107 summary:focus-visible{outline:3px solid var(--ui-focus);outline-offset:4px}._videoGuide_1gfw4_107 ol{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:0;list-style:none;display:grid}._videoGuide_1gfw4_107 li{gap:16px;display:flex}._videoGuide_1gfw4_107 time{color:var(--ui-brand-strong);font-variant-numeric:tabular-nums;flex-shrink:0;font-weight:700}@media (width<=760px){._videoGuide_1gfw4_107 ol{grid-template-columns:1fr}}._buildSteps_1gfw4_32 p{white-space:pre-wrap;overflow-wrap:anywhere;tab-size:2}._answerFeedback_1gfw4_96 p{white-space:pre-wrap}