@font-face{font-family:Course;src:url('font.ttf');font-display:swap}
:root{--ink:#17243d;--muted:#63718a;--blue:#4263eb;--navy:#101a30;--line:#dfe5ef;--paper:#fff;--bg:#f4f6fa;--teal:#008c82;--lime:#d7f683;--shadow:0 10px 36px #14233e07}
*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font:16px/1.65 -apple-system,BlinkMacSystemFont,'Segoe UI',Course,sans-serif;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer;transition:background .18s,border-color .18s,box-shadow .18s,transform .18s}a{color:var(--blue)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #7995fb;outline-offset:4px}.skip{position:absolute;top:-70px;left:20px;z-index:50;padding:12px;background:white}.skip:focus{top:12px}header{background:var(--navy);color:#fff;padding:0 36px;position:sticky;top:0;z-index:10;border-bottom:1px solid #25324c}.header-top{height:82px;display:flex;justify-content:space-between;align-items:center;gap:24px;max-width:1540px;margin:auto}.brand{display:flex;gap:13px;align-items:center;color:white;text-decoration:none;font-size:27px;font-weight:750;line-height:1.1;letter-spacing:-.02em}.brandmark{width:43px;height:43px;display:grid;place-items:center;background:#d7f683;color:#122637;border-radius:13px;font-size:35px;font-weight:700}.brand-sub{display:block;margin-top:6px;font-size:12px;letter-spacing:.03em;color:#a9b8d2;font-weight:400}.header-actions{display:flex;align-items:center;gap:20px}.xp-pill{color:#d7f683;border:1px solid #415241;border-radius:30px;padding:6px 12px;font-size:13px;font-weight:700;white-space:nowrap}.pdf-link{display:flex;gap:12px;align-items:center;color:#d4def0;text-decoration:none;font-size:14px}.pdf-link span{font-size:11px;padding:2px 6px;border:1px solid #495570;border-radius:4px}nav{max-width:1540px;margin:auto;display:flex;gap:5px;padding-bottom:14px;overflow-x:auto;scrollbar-width:thin}nav button{border:0;border-radius:8px;background:transparent;color:#a9b8d2;padding:9px 17px;font-size:14px;white-space:nowrap}nav button:hover{background:#26334d;color:white}nav button.active{background:white;color:var(--navy);box-shadow:0 3px 10px #0002}nav .cheats-tab{color:#d7f683;margin-left:auto;border:1px solid #41523e}nav .cheats-tab.active{background:#d7f683;border-color:#d7f683;color:var(--navy)}.shell{display:grid;grid-template-columns:255px minmax(0,1fr);max-width:1610px;margin:auto;min-height:calc(100vh - 138px)}.course-sidebar{padding:32px 20px;background:white;border-right:1px solid var(--line);position:sticky;top:139px;height:calc(100vh - 139px);overflow:auto}.aside-label,.eyebrow{font-size:11px;font-weight:750;letter-spacing:.12em;color:#78859b}.aside-label{margin:0 12px 22px}.week-button{width:100%;display:flex;align-items:flex-start;gap:12px;text-align:left;border:1px solid transparent;border-radius:12px;background:transparent;color:#56657f;padding:15px 12px;margin:6px 0;font-size:14px;line-height:1.4}.week-button:hover{background:#f4f6fc}.week-button.selected{background:color-mix(in srgb,var(--chapter) 9%,white);border-color:color-mix(in srgb,var(--chapter) 23%,white);color:var(--ink)}.week-number{font-variant-numeric:tabular-nums;font-size:13px;padding:4px 0;min-width:22px;color:#99a6bc;font-weight:700}.selected .week-number{color:var(--chapter)}.week-copy{font-weight:600;flex:1}.week-copy small{display:flex;justify-content:space-between;font-size:11px;color:#8a96aa;font-weight:400;margin-top:7px}.selected .week-copy small{color:var(--chapter)}.progress-block{margin:26px 12px 0;padding-top:23px;border-top:1px solid var(--line);font-size:12px}.progress-heading{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.progress-heading b{font-weight:600;color:var(--ink)}.track{height:6px;background:#e9eef5;border-radius:9px;margin-top:12px;overflow:hidden}.track i{height:100%;background:var(--blue);display:block;transition:width .3s}.progress-block p{margin:14px 0 7px;font-size:12px;color:#8a95a7;line-height:1.7}.text-button{border:0;background:transparent;padding:0;font-size:12px;color:#8290a8}.sidebar-tip{padding:18px;margin:32px 12px 0;background:#f1f6ff;border-radius:10px}.sidebar-tip span{font-size:10px;letter-spacing:.1em;color:#7a8fc5;font-weight:700}.sidebar-tip p{font-size:12px;color:#667ca9;line-height:1.8;margin:8px 0 0}main{padding:42px 48px 70px;min-width:0;max-width:1300px}main:focus{outline:0}h1{font-size:clamp(28px,3.2vw,42px);line-height:1.18;font-weight:750;letter-spacing:-.038em;margin:14px 0 16px}h2{font-size:22px;font-weight:700;line-height:1.4;margin:24px 0 13px;letter-spacing:-.02em}h3{font-size:18px;line-height:1.45;font-weight:650;margin:0 0 10px;letter-spacing:-.01em}p{margin:0 0 16px}.intro{color:var(--muted);max-width:700px;line-height:1.75;font-size:16px}.section-top{display:flex;justify-content:space-between;align-items:center;gap:24px}.chapter-dot{display:inline-block;width:7px;height:7px;border-radius:50%;margin:0 6px 1px 0}.completion-ring{--percent:0%;flex-shrink:0;width:82px;height:82px;background:conic-gradient(var(--blue) var(--percent),#e4e9f3 0);border-radius:50%;display:grid;place-items:center}.completion-ring>span{width:69px;height:69px;border-radius:50%;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:24px;font-weight:700;line-height:1.3}.completion-ring small{font-size:11px;font-weight:400;color:#92a0b4}.overview-metrics{display:flex;gap:28px;margin:20px 0 28px;flex-wrap:wrap;color:#7b87a0;font-size:13px}.overview-metrics b{color:var(--ink);font-size:16px;font-weight:650;margin-right:5px}.focus-card{display:flex;align-items:center;gap:24px;padding:25px 28px;border-radius:15px;background:var(--navy);color:white;box-shadow:0 10px 35px #14284513}.focus-index{font-size:47px;line-height:1;font-weight:300;color:#5b7198;letter-spacing:-.07em;flex-shrink:0}.focus-label{font-size:10px;letter-spacing:.12em;color:#a7beec}.focus-card h3{font-size:20px;margin:6px 0;color:white}.focus-card p{margin:0;font-size:13px;color:#aebed9;max-width:560px;line-height:1.6}.focus-card>.button{margin-left:auto;flex-shrink:0}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:9px;background:var(--blue);color:white;padding:11px 18px;text-decoration:none;font-size:14px;font-weight:600;line-height:1.5;gap:8px}.button:hover{background:#3252d9;box-shadow:0 5px 16px #4263eb20;transform:translateY(-1px)}.button.lime{background:var(--lime);color:#233520}.button.lime:hover{background:#e7ffaa}.button.secondary{background:#e9eefc;color:#3a59b6}.button.ghost{background:white;border-color:var(--line);color:#62718b}.small-button{padding:8px 13px;font-size:12px}.button:disabled{opacity:.5;cursor:default;transform:none}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:30px 0 17px}.section-heading h2{margin:0}.muted{color:#8390a5;font-size:13px}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.lesson-card{background:white;border:1px solid var(--line);border-top:3px solid var(--chapter);border-radius:12px;padding:23px;text-align:left;color:var(--ink);display:flex;flex-direction:column;min-height:275px;box-shadow:var(--shadow)}.lesson-card:hover{border-color:var(--chapter);box-shadow:0 9px 30px #14233e10;transform:translateY(-3px)}.lesson-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}.card-number{font-size:20px;font-weight:350;color:var(--chapter);line-height:1}.lesson-status{font-size:11px;color:#94a0b1}.lesson-card.done .lesson-status{color:#23816b}.lesson-card h3{font-size:19px;margin-bottom:8px}.lesson-card p{font-size:14px;color:#78869c;line-height:1.65;margin:0 0 17px}.formula-preview{background:#f6f8fc;border-radius:6px;padding:10px 12px;font:12px/1.6 ui-monospace,monospace;color:#6b7b96;margin-top:auto;display:block;overflow-wrap:anywhere}.card-foot{font-size:11px;color:#6681c2;margin-top:17px}.week-actions,.actions,.lesson-footer{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:25px}.tag{display:inline-block;border:1px solid var(--line);border-radius:6px;color:#7c8aa1;padding:4px 9px;font-size:12px}.lesson-body{max-width:850px}.lesson-breadcrumb{display:flex;flex-wrap:wrap;gap:10px;font-size:12px;color:#9ba6b7;margin-bottom:27px}.back{border:0;background:transparent;padding:0;color:#7c8ba5;font-size:12px}.lesson-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:24px 0}.segmented{display:inline-flex;padding:4px;border-radius:9px;background:#e5eaf3;gap:3px}.segmented button{border:0;padding:6px 18px;background:transparent;color:#7f8ba0;font-size:13px;border-radius:6px}.segmented button.selected{background:white;color:#304b83;box-shadow:0 2px 6px #2636520c}.formula{background:#edf2ff;border:1px solid #dbe4ff;border-left:3px solid var(--blue);padding:21px 24px;border-radius:10px;color:#3357c6;font:16px/1.9 ui-monospace,'SFMono-Regular',monospace;overflow-wrap:anywhere;white-space:pre-wrap;margin:20px 0}.formula-label{display:block;font:10px/1.5 -apple-system,sans-serif;letter-spacing:.12em;color:#859adb;margin-bottom:10px;font-weight:750}.panel-label{display:block;font-size:10px;letter-spacing:.1em;font-weight:750;margin-bottom:6px;opacity:.7}.warning{background:#fff7e5;border:1px solid #f1e3bc;border-radius:10px;padding:18px 22px;color:#89672d;font-size:14px;line-height:1.8}.memory{background:#eaf6f1;border:1px solid #d4e7de;border-radius:10px;padding:18px 22px;color:#34705b;font-size:14px;line-height:1.8;margin-bottom:22px}.lesson-sections{display:grid;gap:10px;margin:25px 0}.lesson-section{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden}.lesson-section summary{list-style:none;display:flex;gap:14px;align-items:center;cursor:pointer;padding:17px 21px}.lesson-section summary::-webkit-details-marker{display:none}.section-index{color:#9ea9bb;font-size:12px}.lesson-section h3{font-size:16px;margin:0;flex:1}.expand-sign{color:#9aaccb;font-size:23px;font-weight:300;line-height:1}.lesson-section[open] .expand-sign{font-size:0}.lesson-section[open] .expand-sign:after{content:'−';font-size:23px}.section-content{padding:0 21px 18px 48px;color:#66758d;font-size:16px}.section-content p{margin:0}.checkpoint{margin-top:25px;background:white;border:1px solid var(--line);padding:24px;border-radius:12px}.checkpoint h3{margin:12px 0 19px}.checkpoint .options{grid-template-columns:repeat(3,minmax(0,1fr))}.checkpoint .option{font-size:14px;padding:13px}.controls{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:24px 0}.controls input{flex:1;min-width:180px}input,select{border:1px solid #d4deed;border-radius:8px;background:white;color:#435470;padding:10px 13px;min-width:0}input::placeholder{color:#a0adbf}label{display:block;font-size:14px;color:#74839a;margin-bottom:6px}input[type=checkbox]{accent-color:var(--blue);width:17px;height:17px;flex-shrink:0}input[type=range]{accent-color:var(--blue);cursor:pointer}.problem{background:white;border:1px solid var(--line);border-radius:11px;margin:12px 0;overflow:hidden}.problem>summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 24px}.problem>summary::-webkit-details-marker{display:none}.problem>summary:after{content:'+';font-size:25px;font-weight:300;color:#94a6c5}.problem[open]>summary:after{content:'−'}.problem>summary>div>span{font-size:10px;color:#97a5bc;display:block;letter-spacing:.06em;margin-bottom:4px}.problem>summary b{font-weight:600}.problem-content{padding:0 24px 24px}.given{font-size:14px;color:#8a99b1}.step{border-left:2px solid #e4ebfa;padding-left:18px;margin:18px 0;color:#61728d}.step b{color:var(--blue)}.answer{background:#eaf6ef;color:#326d52;border-radius:8px;padding:16px 20px;margin:22px 0;font-size:15px}.note{background:#fff7e7;color:#897245;padding:14px 18px;font-size:13px;line-height:1.8;border-radius:8px}.game-panel{max-width:850px;background:white;border:1px solid var(--line);border-radius:16px;padding:32px;margin-top:24px;box-shadow:var(--shadow)}.game-top{display:flex;justify-content:space-between;gap:15px;font-size:12px;color:#8c9ab0;border-bottom:1px solid #e9eef6;padding-bottom:18px;margin-bottom:25px}.question{font-size:23px;font-weight:650;line-height:1.5;letter-spacing:-.015em;margin:18px 0 24px}.options{display:grid;gap:11px}.option{border:1px solid #dbe4f1;border-radius:9px;background:#fcfdff;color:#526480;text-align:left;padding:16px 20px;font-size:16px;line-height:1.6}.option:hover:not(:disabled){border-color:#819bef;background:#f0f4ff}.option.correct{background:#e9f6ef;color:#267250;border-color:#85bda0}.option.wrong{background:#fff0ec;color:#a25a42;border-color:#d8a393}.option:disabled{cursor:default}.feedback{border-top:1px solid #e6ecf7;margin-top:23px;padding-top:20px}.feedback p{margin:9px 0 16px;color:#6f7e96}.score-box{display:flex;align-items:center;gap:28px;padding:28px;background:var(--navy);color:white;border-radius:13px;margin:24px 0}.score-big{font-size:48px;color:var(--lime);font-weight:650;letter-spacing:-.05em}.flashcard{min-height:300px;display:flex;flex-direction:column;justify-content:center;align-items:start;background:var(--navy);color:white;border-radius:16px;padding:38px;margin-top:26px}.flashcard .eyebrow{color:#95add7}.flashcard .question{font-size:28px}.flash-answer{background:#233551;color:#c0cfea;border-radius:10px;padding:20px 23px;font:16px/1.9 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;width:100%;margin-bottom:15px}.lab-grid{display:grid;grid-template-columns:270px minmax(0,1fr);gap:22px;margin-top:24px}.lab-inputs,.lab-result{background:white;border:1px solid var(--line);border-radius:12px;padding:24px}.field{margin-bottom:19px}.field input,.field select{width:100%}.field input[type=range]{padding:0}.field label b{float:right;color:var(--ink)}.numbers{display:flex;gap:15px;flex-wrap:wrap;margin:20px 0}.number{flex:1;min-width:110px;background:#f0f4ff;border:1px solid #e3eafb;border-radius:10px;padding:15px 18px}.number b{display:block;color:#3c60ce;font-size:27px;font-weight:650;letter-spacing:-.03em}.number small{font-size:12px;color:#8b9ebf}svg.chart{width:100%;height:auto;max-height:370px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;border-bottom:1px solid #e3eaf3;padding:11px}th{font-weight:500;color:#8699b9;background:#f7f9fe}.empty{padding:35px;background:white;border:1px dashed #cbd6e7;border-radius:13px;color:#8796ad;text-align:center}.results-list{display:grid;gap:14px}.results-list article{padding:23px;background:white;border:1px solid var(--line);border-radius:11px}.count{font-size:13px;color:#8a99b1;margin:18px 0}.check-row{display:flex;gap:9px;align-items:center;margin:16px 0;font-size:14px}.exam-timer{color:var(--blue);font-variant-numeric:tabular-nums}.course-note,.metric-note{font-size:12px;color:#91a0b7;margin-top:24px;max-width:760px}.hidden{display:none}.loading{padding:32px;color:#8a97b0}#toast{position:fixed;right:24px;bottom:24px;z-index:30;background:var(--navy);color:#dce6f6;border:1px solid #455675;border-radius:12px;padding:13px 20px;font-size:14px;max-width:calc(100vw - 48px);opacity:0;pointer-events:none;transition:opacity .2s;box-shadow:0 10px 25px #0002}#toast.show{opacity:1}
.cheat-layout{display:grid;grid-template-columns:285px minmax(0,1fr);gap:24px;margin-top:26px;align-items:start}.cheat-selector{background:white;border:1px solid var(--line);border-radius:13px;padding:22px;position:sticky;top:158px;max-height:calc(100vh - 180px);overflow:auto}.cheat-selector h3{font-size:16px}.selection-controls{display:flex;gap:10px;justify-content:space-between;margin:15px 0}.selection-controls button{font-size:12px;color:#7b8cac;background:transparent;border:0;padding:0}.topic-search{width:100%;font-size:13px;margin-bottom:18px}.topic-group{border:0;border-top:1px solid #e6ecf5;padding:14px 0 0;margin:16px 0 0;min-width:0}.group-heading{display:flex;justify-content:space-between;gap:10px;align-items:center;color:#8b9bb6;font-size:11px;font-weight:650;margin-bottom:7px;text-transform:uppercase;letter-spacing:.05em}.group-heading button{border:0;background:transparent;padding:0;color:var(--blue);font-size:11px;letter-spacing:0;text-transform:none}.topic-choice{display:flex;align-items:flex-start;gap:10px;padding:9px 0;font-size:14px;line-height:1.55;margin:0;color:#718198;cursor:pointer}.topic-choice:has(input:checked){color:#31456f}.topic-choice input{margin-top:2px}.cheat-settings{background:white;border:1px solid var(--line);border-radius:12px;padding:22px;margin-bottom:20px}.cheat-title-input{width:100%;font-size:17px;font-weight:600}.cheat-options{display:flex;gap:15px;flex-wrap:wrap;margin:15px 0 0}.cheat-options label{display:flex;align-items:center;gap:7px;font-size:14px;margin:0}.cheat-presets{display:flex;gap:9px;flex-wrap:wrap;margin-top:20px}.cheat-presets button{border:1px solid #dbe5f5;border-radius:7px;padding:7px 12px;background:white;font-size:12px;color:#7b8cac}.cheat-presets button:hover{border-color:var(--blue);color:var(--blue)}.cheat-preview{background:white;border:1px solid var(--line);border-radius:12px;padding:30px;box-shadow:var(--shadow)}.cheat-document-header{border-bottom:2px solid var(--ink);padding-bottom:19px;margin-bottom:23px}.cheat-document-header h2{font-size:24px;margin:8px 0 6px}.cheat-document-header p{font-size:12px;color:#99a6bb;margin:0}.cheat-sheet{display:grid;grid-template-columns:1fr;gap:15px}.cheat-topic{border:1px solid #e1e8f3;border-top:3px solid var(--chapter);border-radius:8px;padding:18px}.cheat-topic .eyebrow{font-size:9px;letter-spacing:.06em}.cheat-topic h3{font-size:16px;margin:6px 0 12px}.cheat-formula{font:14px/1.9 ui-monospace,monospace;overflow-wrap:anywhere;color:#3d5fba;background:#f1f5ff;border-radius:5px;padding:11px 13px;margin-bottom:12px;white-space:pre-wrap}.cheat-topic ol{padding-left:19px;margin:10px 0;color:#667897;font-size:13px}.cheat-topic li{padding-left:3px;margin:4px 0}.cheat-pitfall,.cheat-example{font-size:12px;line-height:1.8;margin:12px 0 0;padding-top:9px;border-top:1px solid #edf0f7}.cheat-pitfall{color:#9d7a3e}.cheat-example{color:#388471}.cheat-status{font-size:12px;min-height:24px;color:#889db9}.cheat-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.cheat-actions button{font-size:13px}.cheat-density{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:18px;font-size:12px;color:#8c9bb3}.cheat-density select{font-size:12px;padding:6px 10px}.cheat-sheet.compact .cheat-topic{padding:15px}.cheat-sheet.compact .cheat-topic h3{font-size:15px}.cheat-sheet.compact .cheat-formula{font-size:13px}.cheat-sheet.compact .cheat-topic li{margin:2px 0}.cheat-context{display:block;margin:18px 0 0;font-size:12px;color:#94a4bc}.print-only{display:none}
.study-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:24px 0}.study-tabs button{border:1px solid var(--line);background:white;border-radius:10px;text-align:left;color:#687994;padding:15px 18px;font-size:14px}.study-tabs button.selected{border-color:#8198e8;color:#3556c3;background:#edf2ff}.study-focus{padding:26px;background:white;border:1px solid var(--line);border-radius:13px}.study-focus h2{margin:10px 0 16px}.study-focus p,.study-focus ul{color:#667891}.study-focus ul{padding-left:21px;margin-bottom:0}.study-focus li{margin:7px 0}.study-topics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.study-topics button{display:flex;gap:12px;align-items:center;text-align:left;border:1px solid var(--line);border-radius:9px;background:white;padding:15px;color:#526784;font-size:14px}.study-topics button:hover{border-color:#829deb}.study-topics span{font-size:12px;color:#9cabc0}.study-topics small{font-size:11px;color:#95a6c0;margin-left:auto;white-space:nowrap}textarea{width:100%;font-size:16px;line-height:1.75;font-family:inherit;border:1px solid #d8e2f1;padding:14px;border-radius:9px;resize:vertical;color:#435671}.study-focus .actions{margin-top:23px}#math-minimum{scroll-margin-top:155px}@media(max-width:760px){.study-tabs,.study-topics{grid-template-columns:1fr}.study-focus{padding:22px}.study-topics small{display:none}}
@media(min-width:1500px){.lesson-grid{gap:22px}.lesson-card{min-height:285px}.cheat-layout{grid-template-columns:310px minmax(0,1fr)}}
@media(max-width:1180px){main{padding:34px 30px}.shell{grid-template-columns:222px minmax(0,1fr)}.course-sidebar{padding:26px 13px}.focus-card{gap:18px;padding:22px}.focus-index{display:none}.lab-grid{grid-template-columns:1fr}.cheat-layout{grid-template-columns:1fr}.cheat-selector{position:static;max-height:360px}.cheat-selector #cheat-topics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px}.checkpoint .options{grid-template-columns:1fr}}
@media(max-width:760px){header{padding:0 18px;position:static}.header-top{height:75px}.brand{font-size:24px}.brandmark{height:38px;width:38px;font-size:30px}.brand-sub{font-size:10px}.header-actions{gap:10px}.xp-pill{font-size:11px;padding:5px 9px}.pdf-link{font-size:0;gap:0}.pdf-link span{font-size:12px;padding:6px 8px}nav{padding-bottom:13px;gap:2px}nav button{padding:8px 12px;font-size:14px}nav .cheats-tab{margin-left:5px}.shell{display:block}.course-sidebar{position:static;height:auto;padding:15px 16px;border-bottom:1px solid var(--line);border-right:0;overflow:visible}.aside-label,.progress-block,.sidebar-tip{display:none}#weeks{display:flex;gap:7px;overflow:auto}.week-button{flex-shrink:0;width:170px;padding:10px;margin:0;gap:8px;font-size:12px}.week-number{font-size:11px;min-width:17px}.week-copy small{font-size:10px;margin-top:4px}main{padding:27px 18px 60px}.section-top{gap:16px}.section-top h1{font-size:29px}.completion-ring{width:60px;height:60px}.completion-ring>span{height:50px;width:50px;font-size:18px}.completion-ring small{font-size:9px}.intro{font-size:14px}.overview-metrics{font-size:11px;gap:16px;margin:13px 0 21px}.overview-metrics b{font-size:14px}.focus-card{display:block;padding:23px}.focus-card .button{margin-top:18px}.focus-card h3{font-size:19px}.focus-card p{font-size:13px}.lesson-grid{grid-template-columns:1fr;gap:15px}.lesson-card{min-height:240px;padding:22px}.section-heading h2{font-size:20px}.section-heading .muted{font-size:11px}.game-panel{padding:24px}.question{font-size:20px}.flashcard{padding:26px}.flashcard .question{font-size:23px}.section-content{padding:0 20px 18px;font-size:15px}.lesson-section summary{padding:16px}.lesson-section h3{font-size:15px}.lesson-toolbar{flex-wrap:wrap}.formula{font-size:14px;padding:18px}.checkpoint{padding:22px}.cheat-selector{padding:20px}.cheat-selector #cheat-topics{grid-template-columns:1fr}.cheat-preview{padding:20px}.cheat-document-header h2{font-size:21px}.cheat-options{gap:10px 14px}.cheat-density{align-items:start}.cheat-density select{max-width:160px}.controls{gap:9px}.problem>summary{padding:18px}.problem-content{padding:0 18px 18px}.lab-result,.lab-inputs{padding:21px}.number b{font-size:23px}.score-box{padding:23px;gap:20px}.score-big{font-size:38px}}
@media print{@page{size:A4;margin:12mm}body{background:white;color:#111;font-family:Arial,Course,sans-serif;font-size:10pt;-webkit-print-color-adjust:exact;print-color-adjust:exact}header,.course-sidebar,.skip,#toast,.cheat-selector,.cheat-settings,.cheat-presets,.cheat-context,.cheat-intro,.cheat-actions,.cheat-status,.screen-only{display:none!important}.shell{display:block;min-height:0;margin:0}main{max-width:none;padding:0}.cheat-layout{display:block;margin:0}.cheat-preview{padding:0;border:0;border-radius:0;box-shadow:none}.cheat-document-header{padding-bottom:5mm;margin-bottom:6mm}.cheat-document-header h2{font-size:17pt}.cheat-document-header p{font-size:8pt;color:#555}.cheat-sheet{display:block}.cheat-sheet.compact{columns:2;column-gap:5mm}.cheat-topic,.cheat-sheet.compact .cheat-topic{padding:3mm;margin-bottom:4mm;break-inside:avoid;page-break-inside:avoid;border:1px solid #ccc;border-top:2px solid var(--chapter);border-radius:0}.cheat-topic h3,.cheat-sheet.compact .cheat-topic h3{font-size:10pt;margin:2mm 0}.cheat-formula,.cheat-sheet.compact .cheat-formula{font-size:8pt;line-height:1.6;padding:2mm}.cheat-topic ol{font-size:8pt;line-height:1.5;margin:2mm 0}.cheat-pitfall,.cheat-example{font-size:7.5pt;line-height:1.5;margin-top:2mm}.cheat-topic .eyebrow{font-size:7pt}.print-only{display:block}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Typeset mathematics uses its own accessible font metrics. */
.math-inline{display:inline-block;max-width:100%;vertical-align:baseline}
.math-inline .katex{font-size:1.08em}
.formula,.formula-preview,.cheat-formula,.flash-answer{font-family:inherit;line-height:2.1;white-space:normal;overflow-wrap:normal}
.formula .math-inline,.formula-preview .math-inline,.cheat-formula .math-inline{overflow-x:auto;overflow-y:hidden;vertical-align:middle;padding:3px 1px;max-width:100%}
.math-prose{overflow-wrap:normal}
.math-fallback{font-family:inherit}
.cheat-topic,.lesson-card,.lab-result,.problem-content{min-width:0}
.katex .base{white-space:nowrap}
@media print{.math-inline .katex{font-size:1em}.formula .math-inline,.cheat-formula .math-inline{overflow:visible;max-width:none}.cheat-formula{font-size:8pt}}

.formula{font-size:18px}.formula-preview{font-size:14px}.flash-answer{font-size:17px}
@media(max-width:600px){.formula{font-size:17px}.formula-preview{font-size:14px}}