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button.active{background:var(--ink);color:var(--white)}.schedule-list{margin-top:20px;display:grid;gap:8px}.schedule-row{display:grid;grid-template-columns:54px 1fr;gap:16px;background:var(--white);border:1px solid var(--line);padding:15px;border-radius:6px}.schedule-row strong{font-size:11px;color:var(--green)}.schedule-row p{font-size:12px;line-height:1.65}.review-list{display:grid;gap:10px;margin-top:28px}.review-list button{border:1px solid var(--line);background:var(--white);border-radius:7px;padding:17px;text-align:left;color:var(--ink);font-size:14px}.review-list button small{display:block;color:var(--muted);font-size:10px;margin-bottom:7px}.review-list button span{float:right}.study-quiz .quiz-stage{padding:28px}.empty-state{margin-top:30px;padding:32px;border:1px dashed #bbc5af;border-radius:9px}.empty-state h2{font-size:25px;margin-bottom:14px}.empty-state p{font-size:14px}.storage-warning{font-size:11px;color:#9c391f}.reset-confirm{padding:17px;border:1px solid #b16d54;background:#fff2ea;border-radius:8px;margin-bottom:20px}.reset-confirm p{font-size:13px;color:var(--ink);margin-bottom:12px}.reset-confirm .button{font-size:12px;padding:10px 14px}
@media(min-width:1450px){.hero{gap:100px}.hero-workspace{margin-right:10px}.site-header{padding-inline:max(48px,calc((100vw - 1280px)/2))}}
@media(max-width:1100px){.section-wrap{width:calc(100% - 64px)}.site-header{padding-inline:32px}.hero{gap:30px;padding-top:60px}.hero h1{font-size:64px}.hero-description{font-size:16px}.hero-actions{gap:17px}.hero-actions .button{padding:17px 18px}.question-sheet{padding:25px}.hero-equation{font-size:35px}.hero-note{gap:9px;font-size:10px}.facts-inner>div{padding-inline:18px;gap:11px}.facts-inner strong{font-size:30px}.facts-inner span{font-size:11px}.problem-grid{gap:50px}.curriculum-section{gap:55px}.pricing-grid{gap:65px}.faq-section{gap:65px}.site-footer{padding-inline:32px}.study-shell{grid-template-columns:245px 1fr}.study-sidebar{padding-inline:18px}.study-content{padding:32px}.study-toolbar{padding-inline:32px}.mock-grid{gap:14px}.mock-card{padding:22px}}
@media(max-width:820px){.site-header{height:76px}.site-header nav{gap:22px}.nav-curriculum{display:none}.hero{grid-template-columns:1fr;gap:45px;padding-top:50px;padding-bottom:60px}.hero h1{font-size:75px}.hero-description{max-width:500px;font-size:18px}.hero-workspace{max-width:570px;width:100%;transform:rotate(.8deg);justify-self:center}.hero-equation{font-size:45px}.workspace-top{font-size:10px}.question-sheet{padding:32px}.hero-feedback{font-size:13px}.facts-inner{grid-template-columns:1fr 1fr;row-gap:24px}.facts-inner>div:nth-child(2){border-right:0}.facts-inner>div:nth-child(3){padding-left:0}.facts-inner strong{font-size:36px}.facts-inner span{font-size:12px}.problem-section{padding-block:70px}.problem-grid{grid-template-columns:1fr;gap:30px}.problem-grid>div{max-width:600px}.method-section{padding-block:65px}.method-cards{gap:12px}.method-cards article{padding:20px}.method-cards h3{font-size:21px}.method-cards p{font-size:12px}.method-graphic{height:115px}.graph-diagnostic{padding-inline:10px}.graph-equation{font-size:19px}.graph-clock{font-size:37px}.section-heading>p{font-size:13px}.curriculum-section{grid-template-columns:1fr;padding-block:70px;gap:35px}.curriculum-section>div>p{max-width:500px}.test-fit{margin-bottom:60px;padding:25px}.pricing-grid{grid-template-columns:1fr;gap:35px;max-width:600px}.pricing-copy h2{font-size:56px}.pricing-handnote{display:none}.pricing-section{padding-block:60px}.price-card{padding:32px}.faq-section{grid-template-columns:1fr;gap:32px;padding-block:65px}.faq-section h2 br{display:none}.final-cta{padding-block:60px 75px}.footer-bottom{flex-direction:column;gap:20px}.footer-bottom>p{max-width:550px}.footer-top{gap:20px}.practice-layout{grid-template-columns:1fr;gap:22px}.practice-sidebar{display:flex;align-items:center;justify-content:space-between;gap:20px}.practice-sidebar .section-label{margin:0}.practice-progress strong{font-size:24px;line-height:1.2}.practice-progress>span{font-size:10px}.practice-progress .progress-track{margin-top:8px}.practice-sidebar .text-button{margin-top:0}.practice-intro h1{font-size:56px}.access-page{grid-template-columns:1fr;gap:40px;padding-block:65px;max-width:600px}.access-page h1{font-size:56px}.study-shell{grid-template-columns:1fr}.study-sidebar{border-right:0;border-bottom:1px solid var(--line);padding:18px 24px}.study-course-label{display:none}.study-modes{grid-template-columns:repeat(4,1fr);margin:0;padding:0;border:0;gap:5px}.study-modes button{padding:12px 8px;font-size:10px;gap:6px}.study-modes button>span:first-child{font-size:11px}.study-modes button>span:last-child{display:none}.lesson-nav{display:flex;overflow-x:auto;gap:8px;margin-top:12px;padding-bottom:5px}.lesson-nav button{flex:0 0 135px;padding:7px;line-height:1.4;font-size:10px}.lesson-nav button>span:first-child{width:14px}.study-device-note{display:none}.study-toolbar{height:48px}.study-content{padding:30px;max-width:780px}.study-content h1{font-size:38px}.lesson-section>p{font-size:14px}.mock-card{padding:24px}.message-page h1{font-size:44px}}
@media(max-width:540px){.section-wrap{width:calc(100% - 40px)}.site-header{padding-inline:20px;height:72px}.brand{font-size:21px;gap:8px}.brand img{width:29px;height:29px}.site-header nav{gap:16px;font-size:11px}.nav-try{padding:9px 10px}.nav-try span{margin-left:4px}.hero{padding-top:40px;gap:38px}.hero .eyebrow{font-size:9px}.hero h1{font-size:clamp(44px,11vw,60px);margin-top:20px}.hero-description{font-size:16px;margin-top:20px}.hero-actions{gap:19px;margin-top:24px}.hero-actions .button{font-size:13px;width:auto;padding:17px 20px;gap:28px}.hero-note{font-size:9px;gap:12px}.fit-note{font-size:10px;margin-top:20px}.hero-workspace{padding:12px;transform:none}.workspace-top{font-size:8px;padding:2px 2px 13px}.question-sheet{padding:22px}.question-sheet h2{font-size:22px}.hero-equation{font-size:34px;padding:25px 0}.hero-options button{padding:11px 12px;gap:15px;font-size:17px}.hero-feedback{font-size:11px;margin-top:20px}.workspace-bottom{font-size:7px;padding-top:13px}.work-tag{font-size:8px}.facts-inner{padding-block:22px;gap:18px 0}.facts-inner>div{padding-inline:14px;gap:12px}.facts-inner strong{font-size:31px}.facts-inner span{font-size:10px}.section-label{font-size:9px;margin-bottom:23px}.problem-section{padding-block:58px}.problem-grid h2{font-size:34px}.problem-grid .large-copy{font-size:19px}.problem-grid p{font-size:14px}.section-heading{align-items:flex-start;gap:25px;margin-bottom:30px}.section-heading h2{font-size:35px}.section-heading>p{display:none}.method-cards{grid-template-columns:1fr}.method-cards article{padding:24px;position:relative;padding-left:24px}.method-graphic{height:100px;margin-block:10px 22px}.graph-diagnostic{padding-inline:70px}.graph-equation{font-size:24px}.graph-clock{font-size:44px}.method-cards h3{font-size:25px}.method-cards p{font-size:14px}.curriculum-section h2{font-size:40px}.curriculum-section>div>p{font-size:14px}.curriculum-list summary{font-size:17px;gap:15px;padding-block:22px}.curriculum-list summary small{font-size:11px}.details-body{font-size:13px;padding-inline:25px 10px}.test-fit{padding:24px 20px;gap:12px}.fit-icon{font-size:25px}.test-fit h3{font-size:18px;line-height:1.25}.test-fit p{font-size:12px}.test-fit .text-link{font-size:11px;line-height:1.5;gap:8px}.pricing-copy h2{font-size:48px}.pricing-copy>p{font-size:16px;margin-top:22px}.price-card{padding:25px}.price-card h3{font-size:26px}.price-value>span{font-size:65px}.inclusions li{font-size:12px}.faq-list summary{font-size:16px;line-height:1.4}.faq-list details>p{font-size:13px}.faq-section h2{font-size:38px}.final-cta .eyebrow{font-size:9px}.final-cta h2{font-size:35px;line-height:1.12}.site-footer{padding-inline:20px}.footer-top{flex-direction:column;align-items:flex-start;gap:12px;padding-bottom:25px}.footer-top p{font-size:11px}.footer-bottom{font-size:9px;gap:18px}.footer-bottom>div{gap:18px;flex-wrap:wrap}.footer-bottom>div>span{flex-basis:100%}.practice-intro{padding-top:40px;padding-bottom:32px}.practice-intro h1{font-size:49px}.practice-intro>p{font-size:14px}.practice-intro .eyebrow{font-size:9px}.practice-sidebar .section-label{font-size:9px}.practice-sidebar .text-button{font-size:10px}.quiz-stage{padding:24px}.quiz-prompt{font-size:20px}.quiz-option{padding:13px 12px;font-size:14px;gap:12px}.passage{padding:16px}.passage p{font-size:14px;line-height:1.8}.quiz-meta{font-size:8px}.quiz-controls .button{font-size:12px;padding:13px 16px}.answer-feedback{padding:18px}.answer-feedback p{font-size:13px}.results-breakdown>div{padding:15px;font-size:11px}.access-page{padding-block:45px}.access-page h1{font-size:49px}.access-page>div>p{font-size:14px}.access-card{padding:24px}.access-card h2{font-size:24px}.message-page{padding-block:65px}.message-page h1{font-size:38px}.legal-page{padding-block:50px 70px}.legal-page h1{font-size:51px}.legal-page h2{font-size:23px}.legal-page p{font-size:14px}.study-page .site-header{height:68px}.study-sidebar{padding:14px 15px}.study-modes button{gap:4px;padding:10px 6px;font-size:8px}.study-modes button>span:first-child{font-size:10px}.study-content{padding:27px 20px}.study-toolbar{padding-inline:20px;font-size:8px}.study-toolbar>span:last-child{font-size:8px;max-width:155px}.study-content h1{font-size:32px}.study-content .lesson-summary{font-size:14px}.lesson-section h2{font-size:22px}.worked-example{padding:20px}.worked-example .example-problem{font-size:18px}.worked-example ol{font-size:13px}.lesson-actions .button{padding:14px;font-size:12px}.mock-grid{grid-template-columns:1fr}.study-quiz .quiz-stage{padding:22px}.mock-timings{gap:28px}.mock-question-nav button{width:28px;height:28px}.timer{font-size:20px}.schedule-row{grid-template-columns:40px 1fr;gap:10px}.review-list button{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
[hidden]{display:none!important}.button:disabled{opacity:.5;transform:none!important}.button:disabled:hover{background:var(--orange)}
.test-banner{background:#dfe8d4;color:#31462c;text-align:center;padding:8px 15px;font-size:11px;border-bottom:1px solid #becdaa}
.study-sidebar{min-width:0}.study-modes button{min-width:0}.lesson-nav{min-width:0}
@media(max-width:820px){.study-shell{grid-template-columns:minmax(0,1fr)}.study-modes{grid-template-columns:repeat(4,minmax(0,1fr))}}
/* Course site visual system (extracted from progresstiger-ibew); colours set by tools/new_site.py. */
.hero{position:relative;isolation:isolate;gap:50px;padding-block:68px 60px}.hero-orbit{position:absolute;inset:0;overflow:hidden;z-index:-1;pointer-events:none}.hero-orbit span{position:absolute;width:450px;height:450px;border:1px solid #d6d9cc;border-radius:50%;right:-50px;top:20px}.hero-orbit span:nth-child(2){width:530px;height:530px;right:-90px;top:-20px}.hero-orbit span:nth-child(3){width:610px;height:610px;right:-130px;top:-60px}.highlight-ink{position:relative;color:var(--green);background:linear-gradient(transparent 76%,#ffb40030 76%,#ffb40030 91%,transparent 91%)}.hero-copy h1{font-weight:600;letter-spacing:-.065em}.hero .hero-actions{gap:12px}.hero .hero-actions .button{padding:17px 20px;gap:17px}.hero-workspace{position:relative;transform:rotate(1deg);background:#e4e9de;padding:16px;box-shadow:0 32px 65px -24px #263a2838,0 2px 0 #ffffff inset;animation:desk-enter .6s ease-out both}.workspace-top{padding-bottom:14px;font-size:8px}.sound-toggle{border:1px solid #bac6b1;background:transparent;color:#395b3d;border-radius:20px;font-size:10px;font-weight:500;padding:5px 10px;white-space:nowrap;display:inline-flex;align-items:center;gap:4px;min-height:32px}.sound-toggle[aria-pressed=true]{background:#1c2329;color:#fffefb;border-color:#1c2329}.workspace-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;background:#cfd9c5;border-radius:8px;padding:4px;margin-bottom:12px}.workspace-tabs button{border:0;background:transparent;border-radius:5px;padding:10px 4px;color:#5b6954;font-size:10px;font-weight:600}.workspace-tabs button[aria-pressed=true]{background:#fffefb;color:#191c19;box-shadow:0 2px 4px #334d2720}.hero-options button{transition:border-color .15s,background .15s,transform .15s}.hero-options button:hover{transform:translateY(-2px)}.hero-feedback{min-height:55px}.hero-feedback strong{font-size:13px}.hero-steps{gap:8px;margin-top:12px;counter-reset:answer-step}.hero-steps>span{padding-left:27px;position:relative;line-height:1.6}.hero-steps>span:before{counter-increment:answer-step;content:counter(answer-step);position:absolute;left:0;top:1px;width:19px;height:19px;border:1px solid #cbd8c5;border-radius:50%;text-align:center;line-height:17px;font-size:9px;color:#1c2329}.preview-passage{margin-top:20px;padding:16px;border-left:3px solid #ffb400;background:#f4f1e9;font-size:13px;line-height:1.8;color:#45503f}.preview-question{font-size:13px;color:var(--ink);margin-top:18px;font-weight:600}.preview-options{display:grid;gap:8px;margin-top:14px}.preview-options button{font-size:12px;text-align:left;padding:12px;border:1px solid var(--line);border-radius:6px;background:var(--white)}.preview-options button.correct{background:#e7efe7;border-color:#1c2329}.preview-options button.incorrect{background:#fcece4;border-color:#b1432b}.preview-timings{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:30px 0 20px}.preview-timings>div{padding:20px 15px;background:#eef2e8;border-radius:9px}.preview-timings span{font-size:9px;letter-spacing:.12em;color:#65745b}.preview-timings strong{display:block;font-size:46px;font-weight:500;letter-spacing:-.06em;color:#1c2329;line-height:1.5}.preview-timings small{font-size:13px;letter-spacing:0;margin-left:6px}.preview-timings p{font-size:11px}.preview-mock-note{font-size:13px;line-height:1.7;margin-bottom:18px}.hero-route{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:0 8px 38px;font-size:12px;color:#616d57}.hero-route span{display:flex;align-items:center;gap:10px}.hero-route b{width:29px;height:29px;display:inline-grid;place-items:center;border:1px solid #ccd4c3;border-radius:50%;font-size:9px;font-weight:500;color:#1c2329;background:#e9eee3}.hero-route i{font-size:22px;color:#a6af9c;font-style:normal}.facts-bar{background:#eaeee3}.facts-inner strong{color:#1c2329}.problem-section{padding-block:80px}.method-section{position:relative;background:radial-gradient(ellipse at 90% 5%,#32462d,transparent 60%),#191e19}.method-cards article{transition:transform .2s,border-color .2s;box-shadow:0 12px 24px #00000016}.method-cards article:hover{transform:translateY(-5px);border-color:#718366}.curriculum-section{padding-block:90px}.pricing-section{background:radial-gradient(ellipse at 5% 90%,#cad7bc,transparent 70%),#e2e9da}.price-card{padding:35px;border-color:#b5c3a7;box-shadow:0 24px 55px -28px #30472866;position:relative}.price-card:before{content:'';position:absolute;inset:0 0 auto;height:5px;border-radius:15px 15px 0 0;background:var(--orange)}.purchase-fit{background:#f0f3e9;border-radius:6px;padding:12px 14px;font-size:11px;line-height:1.7;margin-top:16px}.purchase-fit strong{color:#34492d}.purchase-policy{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px;margin-top:20px;padding-top:18px;border-top:1px solid var(--line);font-size:10px;color:#64735a}.final-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.site-header .nav-try{background:var(--ink);color:var(--white);border-color:var(--ink)}.site-header nav .nav-try:hover{background:#364830;color:var(--white)}.quiz-stage{box-shadow:0 16px 35px -28px #25392755}.quiz-option{transition:background .15s,border-color .15s}.quiz-option.selected{box-shadow:0 0 0 1px var(--green);border-color:var(--green);background:#eef4e7}.answer-feedback{border-left:4px solid var(--green);animation:answer-enter .2s ease-out}.answer-feedback h3{color:var(--green)}.feedback-icon{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#dce8d5;font-size:14px;margin-right:8px;vertical-align:middle}.answer-feedback.is-retry{border-left-color:#bb6325;background:#faf2e6}.answer-feedback.is-retry h3{color:#925222}.answer-feedback.is-retry .feedback-icon{background:#f1e0c7}.study-course-label{border-left:4px solid var(--orange);padding-left:14px}.study-content{padding-top:40px}.study-main{background:linear-gradient(135deg,#f4f1e9,#f7f6ef)}.study-device-note .sound-toggle{margin-bottom:14px;display:flex}.practice-sidebar .sound-toggle{margin-top:25px}.worked-example{box-shadow:0 8px 20px -16px #25392744}.worked-example ol li{padding-left:5px;margin-bottom:8px}.math-inline{white-space:normal}.katex-display{overflow-x:auto;overflow-y:hidden;padding-block:4px}.hero-equation .katex{font-size:1em}.quiz-option .katex{font-size:1.1em}.learning-progress{font-size:10px;margin-top:15px;color:#5e7351}.learning-progress strong{font-weight:500;color:#1c2329}.learning-progress .progress-track{margin-top:9px}.reveal-in{animation:answer-enter .25s ease-out}@keyframes desk-enter{from{opacity:0;transform:translateY(15px) rotate(0)}to{opacity:1;transform:translateY(0) rotate(1deg)}}@keyframes answer-enter{from{opacity:.6;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:1050px){.hero{gap:30px}.hero .hero-actions .button{font-size:12px;padding:15px}.hero-route{font-size:10px}.hero .hero-workspace .question-sheet{padding:25px 20px}.workspace-top{font-size:7px}.workspace-top .sound-toggle{font-size:9px}.purchase-policy{grid-template-columns:1fr}}
@media(max-width:760px){.hero{padding-block:43px 30px;gap:35px}.hero-orbit{display:none}.hero-copy h1{font-size:clamp(47px,9vw,66px)}.hero-workspace{transform:none;animation:none}.hero-route{flex-wrap:wrap;justify-content:center;gap:12px;padding-bottom:26px}.hero-route span{font-size:9px;gap:6px}.hero-route b{width:22px;height:22px;font-size:8px}.hero-route i{display:none}.hero .hero-actions .button{font-size:12px;padding:16px;flex-grow:1;justify-content:space-between}.price-card{padding:27px 23px}.preview-timings strong{font-size:43px}.final-actions .button{margin-top:24px}.purchase-policy{grid-template-columns:1fr 1fr}.study-course-label{display:none}.study-device-note .sound-toggle{margin-bottom:5px}.workspace-top{font-size:8px}.sound-toggle{min-height:35px}.hero .hero-workspace .question-sheet{padding:24px}.hero-equation{font-size:30px}.hero-options button{padding:13px}.study-content{padding:25px 20px}.learning-progress{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.button.primary:hover,.hero-options button:hover,.method-cards article:hover{transform:none}.hero-workspace{transform:none}}
.site-header{position:sticky;top:0;box-shadow:0 1px 0 #d9d9cd;z-index:30}.test-banner{position:relative}.site-header nav .nav-try{white-space:nowrap}@media(max-width:430px){.site-header .brand{font-size:20px;gap:6px}.site-header .brand img{width:28px;height:28px}.site-header nav{gap:12px}.site-header .nav-try{padding:10px;font-size:10px}.site-header nav>a:not(.nav-try){font-size:10px}}

.quiz-option>.option-text{min-width:0;line-height:1.6;flex:1;overflow-wrap:anywhere}.math-inline{max-width:100%}.hero-steps .katex{font-size:1.12em}
.study-toolbar-actions{display:flex;gap:16px;align-items:center;letter-spacing:0}.study-toolbar-actions #study-saved{font-size:10px;color:var(--muted)}@media(max-width:820px){.study-toolbar-actions{gap:6px}.study-toolbar-actions #study-saved{display:none}.study-toolbar{padding-inline:20px}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.preview-passage{max-height:175px;overflow-y:auto}.preview-options button{display:flex;gap:9px;align-items:flex-start;line-height:1.6}.preview-options button>span{font-size:9px;color:var(--muted);border:1px solid var(--line);border-radius:3px;min-width:19px;text-align:center;margin-top:2px}.preview-options button{font-size:11px}.preview-options button:hover{border-color:var(--green)}
.worked-example .example-hint{font-size:11px;color:#687a5d;margin-top:14px}.example-reveal{display:flex;align-items:center;justify-content:space-between;gap:20px;width:100%;border:1px solid #cdd8c1;border-radius:6px;padding:12px 15px;background:#edf3e7;color:#1c2329;font-weight:500;font-size:12px;margin-top:15px}.example-reveal:hover{background:#e2ecd8}.example-reveal[aria-expanded=true]{background:#e2ecd8}.example-reveal span{font-size:18px}.worked-example .example-problem .katex{font-size:1.15em}
.worked-example ol .katex,.answer-feedback p .katex{font-size:1.25em}

/* Long explanations stay readable on a phone: one authored step per row. */
.solution-steps{font-size:16px;line-height:1.85;margin:20px 0 0;padding-left:1.65em;display:grid;gap:18px;list-style:decimal}
.solution-steps>li{padding-left:8px;min-width:0}
.solution-steps>li::marker{font-weight:700;color:var(--green)}
.solution-step-content{min-width:0;overflow-wrap:break-word}
.solution-step-content p+p{margin-top:10px}
.answer-feedback .solution-steps p,.worked-example .solution-steps p,.hero-feedback .solution-steps p{font-size:16px;line-height:1.85;color:var(--ink)}
.worked-example ol.solution-steps{font-size:16px;line-height:1.85;padding-left:1.65em;margin-bottom:24px}
.worked-example ol.solution-steps>li{margin:0;padding-left:8px}
.solution-step-content .pt-math{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle;padding-block:3px}
.solution-step-content .katex{font-size:1.2em}
.choice-explanations{margin-top:26px;border-top:1px solid var(--line);padding-top:22px}
.choice-explanations h4{font-size:16px;line-height:1.4;margin:0 0 16px;font-weight:600}
.choice-explanations ul{margin:0;padding:0;list-style:none;display:grid;gap:18px}
.choice-explanations li{border-left:2px solid var(--line);padding-left:14px}
.choice-explanations li.supported-choice{border-color:var(--green)}
.choice-explanations strong{font-size:13px;letter-spacing:.015em}
.answer-feedback .choice-explanations p,.hero-feedback .choice-explanations p{font-size:15px;line-height:1.8;margin-top:6px}
.choice-explanations .reviewed-option{font-weight:500;color:var(--ink)}
@media(max-width:600px){.solution-steps{gap:20px;padding-left:1.35em}.solution-steps>li{padding-left:5px}.worked-example ol.solution-steps{padding-left:1.35em}.choice-explanations li{padding-left:10px}}
@media(max-width:820px){.practice-sidebar{flex-wrap:wrap;gap:12px}.practice-sidebar .sound-toggle{margin-top:0}.practice-progress{min-width:95px}}@media(max-width:360px){.site-header{padding-inline:12px}.site-header .brand{font-size:18px;gap:4px}.site-header .brand img{width:23px;height:23px}.site-header nav{gap:8px}.site-header .nav-try{font-size:9px;padding:9px 8px}.hero-equation{font-size:clamp(24px,7.6vw,30px)}.hero-note{gap:9px;font-size:8px}.workspace-top{font-size:7px;gap:5px}.workspace-top .sound-toggle{font-size:9px;padding-inline:7px}.purchase-policy{grid-template-columns:1fr}}