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:root[data-theme=dark]{--bg:#191c20;--surface:#22262b;--ink:#eceeeF;--muted:#adb5bf;--line:#393f47;--soft:#2a3037;--accent:#a5c6ed;--accent-hover:#bfd9f5;--tint:#26384e;--positive:#a5c6ed;--negative:#dfacb5;color-scheme:dark}
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@media(max-width:900px){:root{--header:82px}.sidebar{display:none}.workspace{margin-left:0}.platform-identity{gap:10px}.platform-brand{font-size:25px}.course-brand{font-size:14px;padding-left:12px}.course-brand svg{width:24px;height:24px}.platform-header{gap:12px;padding-inline:20px}.all-courses{display:none}.course-toolbar{padding:18px 28px 0;font-size:11px}.storage-status{padding-inline:28px}main{padding:25px 28px 50px}footer{padding-inline:28px}.mobile-menu{display:flex;align-items:center;justify-content:center;gap:12px;min-height:42px;border:1px solid var(--line);border-radius:10px;padding:8px 12px;background:transparent;font-size:11px;flex-shrink:0}.mobile-navigation{margin-inline:28px;max-width:calc(100% - 56px);grid-template-columns:1fr 1fr;gap:22px;display:grid}.mobile-navigation .nav-block+.nav-block{margin-top:0}.overview{grid-template-columns:minmax(0,1fr) 230px;gap:30px}.lesson-article{max-width:790px}.lab-grid{gap:16px}}
@media(max-width:600px){:root{--header:98px}.platform-header{padding-inline:17px}.platform-identity{display:grid;gap:6px}.platform-brand{font-size:24px;gap:7px}.platform-brand>svg,.platform-brand>img{width:27px;height:27px}.course-brand{padding:0;border:0;font-size:11px;gap:7px;letter-spacing:-.01em}.course-brand svg{height:17px;width:19px}.platform-actions{gap:6px;max-width:165px}.platform-actions>[data-ryadom-profile]{min-width:0}.platform-actions .rp-trigger{font-size:10px!important;padding:8px 9px!important;max-width:110px;white-space:nowrap!important;overflow:hidden;text-overflow:ellipsis}.theme-button{width:40px;height:40px;min-width:40px}.course-toolbar{padding:15px 20px 0;gap:12px}.storage-status{padding-inline:20px;font-size:10px;margin-top:7px}main{padding:22px 20px 45px}footer{padding:18px 20px;font-size:10px}.mobile-navigation{margin-inline:20px;max-width:calc(100% - 40px);gap:17px;padding:12px}.mobile-navigation .nav-link{font-size:11px;padding-inline:7px}.mobile-navigation .nav-heading{font-size:9px;margin-left:7px}.overview{display:block;padding-bottom:24px;margin-bottom:23px}.overview h1{font-size:33px;max-width:22ch;margin-top:8px}.overview .lead{font-size:14px;line-height:1.8;margin-bottom:19px}.overview-aside{display:none}.level-switch{width:100%;display:grid;grid-template-columns:1fr 1fr}.level-tab{padding-inline:9px;font-size:11px}.next-step{padding:18px;display:block;margin-bottom:29px}.next-copy h2{font-size:17px;line-height:1.5;margin:7px 0}.next-step>.button{margin-top:15px;font-size:11px;min-height:42px}.topic-grid{gap:12px}.topic-card{padding:14px 13px 12px;border-radius:11px}.topic-card .topic-visual{height:78px;margin-bottom:9px}.topic-card h3{font-size:14px;line-height:1.5;margin-bottom:9px}.topic-card p{font-size:11px;line-height:1.8;margin-bottom:13px}.topic-card .eyebrow{font-size:8px;line-height:1.6}.card-bottom{font-size:9px;gap:5px;padding-top:10px}.card-arrow{font-size:16px}.section-heading{gap:10px;margin-bottom:14px}.section-heading h2{font-size:21px}.section-heading>span{font-size:10px}.topic-group{margin-bottom:29px}.support-links{grid-template-columns:1fr;gap:22px;margin-top:28px}.support-link h3{font-size:15px}.support-link p{font-size:12px}.lesson-heading{padding-bottom:23px;margin-bottom:23px}.lesson-heading h1{font-size:30px;line-height:1.25;margin-top:10px}.lesson-heading>p{font-size:14px;line-height:1.8}.lesson-meta{font-size:10px;gap:7px 15px}.lesson-article{font-size:15px;line-height:1.9}.lesson-article h2{font-size:22px;margin-bottom:17px}.lesson-article h3{font-size:18px}.lesson-article section{margin-bottom:31px}.lesson-goals{padding-bottom:20px;margin-bottom:26px}.lesson-goals h2{font-size:16px}.lesson-goals ul{font-size:12px}.lesson-article div[data-math]{padding:12px;font-size:14px}.lesson-article table{font-size:12px}.lesson-article th,.lesson-article td{padding:10px}.practice-card{padding:18px;margin:17px 0}.practice-card>p{font-size:13px;line-height:1.85}.practice-card h3{font-size:14px}.practice-section>h2{font-size:22px}.choice-list label{font-size:12px;padding:10px 11px}.answer-feedback{font-size:12px}.lesson-bottom{align-items:stretch;gap:12px}.lesson-bottom .button{font-size:11px}.note-section textarea{font-size:13px}.coverage-page h1{font-size:31px}.coverage-page{font-size:14px}.coverage-page h2{font-size:22px}.lab-grid{grid-template-columns:1fr;gap:18px}.lab-card{padding:20px}.source-note{font-size:10px}}
@media(max-width:360px){.topic-grid{grid-template-columns:1fr}.topic-card{display:grid;grid-template-columns:92px minmax(0,1fr);column-gap:14px;padding:15px}.topic-card .topic-visual{grid-column:1;grid-row:1/5;align-self:center;height:90px;margin:0}.topic-card .eyebrow,.topic-card h3,.topic-card p,.topic-card .card-bottom{grid-column:2}.topic-card .eyebrow{margin-bottom:5px}.topic-card p{margin-bottom:10px}.topic-card .card-bottom{padding-top:7px}.platform-header{padding-inline:13px}.course-toolbar{padding-inline:16px}.storage-status{padding-inline:16px}main{padding-inline:16px}.mobile-navigation{margin-inline:16px;max-width:calc(100% - 32px)}.platform-actions .rp-trigger{max-width:96px;font-size:9px!important}.course-brand{font-size:10px}.platform-brand{font-size:23px}.platform-actions{gap:4px}.theme-button{width:37px;height:37px;min-width:37px}.lesson-heading h1{font-size:28px}.answer-row{display:block}.answer-row>.button{margin-top:10px}.level-tab{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.topic-card:hover{transform:none}}
@media print{.platform-header,.sidebar,.course-toolbar,.storage-status,footer,.lesson-toc,.note-section,.lesson-bottom,.mobile-navigation,.practice-form,.reading-return{display:none!important}.workspace{margin:0}main{max-width:none;padding:0}.lesson-layout{display:block}.lesson-article{max-width:none}.lesson-article section{break-inside:auto}.practice-card{break-inside:avoid}.topic-grid{grid-template-columns:repeat(2,1fr)}:root{--bg:#fff;--surface:#fff;--ink:#111;--muted:#555;--line:#ccc;--soft:#eee;--accent:#234d70}}

.note-conflicts{font-size:12px;border-top:1px solid var(--line);margin-top:15px;padding-top:8px}.note-conflicts summary{cursor:pointer;padding:9px 0;color:var(--accent)}.note-conflicts p{white-space:pre-wrap;border-left:2px solid var(--line);padding-left:13px;margin-top:12px;font-size:12px;line-height:1.8}.formula-error{color:var(--negative);font-size:12px}
/* Phone cards keep the same reading size as the rest of the course. */
@media(max-width:600px){
 .topic-grid{grid-template-columns:minmax(0,1fr);gap:16px}
 .topic-card{display:flex;padding:20px;border-radius:13px}
 .topic-card .topic-visual{width:100%;height:105px;margin-bottom:15px}
 .topic-card .eyebrow{font-size:10px;margin-bottom:9px}
 .topic-card h3{font-size:17px;line-height:1.45;margin-bottom:11px}
 .topic-card p{font-size:13px;line-height:1.8;margin-bottom:18px}
 .card-bottom{font-size:11px;padding-top:12px}
 .card-arrow{font-size:18px}
 .level-tab{font-size:12px}
 .mobile-navigation .nav-link{font-size:12px}
 .next-step>.button,.lesson-bottom .button{font-size:12px}
 .next-copy p,.support-link p{font-size:13px}
 .lesson-meta{font-size:11px}
 .source-note{font-size:11px}
 .practice-card>p,.answer-feedback,.choice-list label{font-size:13px}
 .practice-card h3{font-size:15px}
 .note-section textarea{font-size:14px}
}
.widget-controls{display:grid;gap:14px;margin:20px 0 22px}
.widget-controls>label{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:7px 14px;color:var(--muted);font-size:12px;line-height:1.65}
.widget-controls>label>output{display:inline;font-size:13px;color:var(--ink);font-variant-numeric:tabular-nums}
.widget-controls input[type=range]{grid-column:1/-1;padding:0;min-height:24px;accent-color:var(--accent);border:0;background:transparent}
.method-widget .widget-result{font-size:14px;color:var(--ink);line-height:1.9;border-top:1px solid var(--line);padding-top:18px;margin-bottom:17px}
.method-widget .widget-assumptions{font-size:12px;line-height:1.8;color:var(--muted);margin:17px 0 0}
.method-widget h3{font-size:16px;margin:0 0 11px}.method-widget>p{font-size:13px;line-height:1.85}
@media(max-width:360px){.topic-card .eyebrow,.topic-card h3,.topic-card p,.topic-card .card-bottom{grid-column:auto}.topic-card .topic-visual{height:100px}.topic-card{padding:18px}.level-tab{font-size:11px}}