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solid #e7edf5;padding:12px 15px;display:flex;flex-wrap:wrap;flex-direction:row;gap:9px}.preview-tool-symbol,.practice-question-tools p{display:none}.practice-question-tools a,.preview-solution-button{font-size:10px;padding:9px 10px;width:auto;min-height:35px;gap:5px}.practice-question-tools a:last-of-type{background:white;padding-left:0;color:#7f9cbc}.practice-question-tools .icon{width:14px;height:14px}.demo-solution{margin:0 17px 19px;padding:14px;font-size:12px}.rv-features{padding:37px 0 43px}.feature-layout{grid-template-columns:1fr;gap:20px}.feature-list{display:grid;grid-template-columns:1fr 1fr;gap:8px}.feature-list button{font-size:10px;padding:10px 8px;gap:7px;min-height:46px;flex-wrap:wrap}.feature-list button>.icon:first-child{width:23px;height:23px}.feature-list small{font-size:9px;display:none}.feature-list button>.icon:last-child{display:none}.feature-preview{padding:22px;min-height:0;border-radius:10px}.feature-preview-art{padding:19px;gap:19px;min-height:130px;margin-bottom:19px}.feature-art-symbol{font-size:59px}.feature-preview-art>div>span{font-size:10px}.feature-preview h3{font-size:21px}.feature-preview p{font-size:12px;margin-bottom:15px}.feature-preview>a{font-size:11px}.rv-subscribe{padding:31px 0}.rv-subscribe>.site-wrap{display:block}.rv-subscribe>.site-wrap>div{gap:20px;align-items:start}.subscribe-symbol{width:59px;height:70px;font-size:47px;border-radius:13px;box-shadow:5px 6px 0 #cad5e4;margin-top:4px}.subscribe-symbol small{font-size:8px;right:9px;bottom:7px}.rv-subscribe h2{font-size:20px;line-height:1.5;margin-bottom:9px}.rv-subscribe p{font-size:11px;line-height:1.85}.rv-subscribe .site-button{margin-top:23px;font-size:12px;padding:10px 18px;min-height:42px}.course-hero{padding-bottom:33px}.course-hero-grid{margin-top:16px;gap:13px}.course-hero h1{font-size:30px}.course-hero .course-english{font-size:20px}.course-hero p{font-size:13px;line-height:1.9}.course-monogram{width:55px;height:63px;border-radius:11px}.course-resources{padding:30px 0 35px}.resource-grid{gap:14px}.resource-card{padding:23px;border-radius:12px}.resource-card h2{font-size:20px}.resource-card p{font-size:12px}.resource-card .resource-icon{width:45px;height:45px;margin-bottom:0}.resource-icon>.icon{width:25px;height:25px}.plan-hero h1{font-size:29px}.plan-card{border-radius:12px}}
@media(prefers-reduced-motion:reduce){.hero-highlight:after{transform:none}}
@media(max-width:760px){.hero-mobile-break{display:block}}

/* Detail pass: reading, keyboard focus and direct feedback. */
:root{--blue:#2f73c3;--readable-soft:#526885}
.site-plan-link,.site-plan-link:hover{color:var(--navy)}
.site-links summary[aria-current=page],.site-nav-actions>a[aria-current=page]{color:var(--blue);font-weight:700}
.site-nav-actions>a:not(.site-plan-link){padding:10px 0}
.site-course-dropdown a[aria-current=page]{background:var(--sky);color:var(--blue);font-weight:600}
.site-links a,.site-links summary,.site-course-dropdown a{min-height:44px;display:flex;align-items:center}
.site-button,.site-plan-link,.course-row,.resource-card,.feature-list button,.rail-action{transition:background-color .14s ease,border-color .14s ease,box-shadow .14s ease}
.site-button:active,.rail-action:active{filter:brightness(.94)}
.resource-card:hover{box-shadow:0 8px 24px #0d214d0c}
.resource-card:focus-visible{border-color:var(--blue)}
.portal-category>summary:hover{background:#ffffff0a}
.portal-category>summary:focus-visible{outline:3px solid #e4f2ff;outline-offset:-5px}
.rv-home-shell a:focus-visible{outline-color:#b8daff}
.portal-course-choice a:focus-visible{outline-color:var(--blue);outline-offset:2px}
.feature-list button:hover{background:#f3f6fa;border-color:#d9e3ef}
.feature-list button[aria-pressed=true]{border-color:#b5cee7;background:#edf4fb;color:var(--navy)}
.feature-list button[aria-pressed=true] small{color:#395b82}
.rv-proof-value{font-variant-numeric:tabular-nums}
.rv-proof-card p{font-size:12px;color:#c3d4ee}
.rv-proof-note{font-size:11px;color:#a9bfdf}
.category-subtitle,.portal-detail-note{color:#eef5ff}
.portal-course-choice .course-card p{color:var(--readable-soft);font-size:12px}
.course-row{min-height:44px;font-size:13px}
.rv-section-title p,.rv-detail-cards p,.rv-subscribe p,.feature-preview p{color:var(--readable-soft);font-size:14px}
.rv-detail-cards a,.feature-preview>a{font-size:13px;min-height:32px}
.practice-tabs>span{color:var(--readable-soft)}
.practice-question-head{color:var(--readable-soft)}
.practice-question-head>span:first-child{color:#285f99}
.practice-preview .lab-head,.practice-preview .lab-head small,.practice-preview .lab-values,.practice-preview .lab-foot{color:var(--readable-soft)}
.practice-preview .lab-head,.practice-preview .lab-foot{font-size:12px}
.practice-question-tools a,.preview-solution-button{color:#285f99;min-height:44px;font-size:13px}
.practice-question-tools p{color:var(--readable-soft);font-size:12px}
.feature-list small,.feature-preview-art>div>span{color:var(--readable-soft)}
.footer-link-groups a{font-size:13px;min-height:30px;margin:4px 0}
.footer-note,.footer-bottom,.plan-proposal-note,.plan-price small{color:var(--readable-soft)}
#tangentSlider{min-height:44px;margin:0;touch-action:pan-y}
#courses,#syllabus,.question{scroll-margin-top:24px}
.site-top{position:fixed;right:24px;bottom:24px;z-index:25;display:grid;place-items:center;width:48px;height:48px;border-radius:50%;background:white;color:var(--navy);border:1px solid #d5e1ee;box-shadow:0 4px 18px #0d214d18}
.site-top[hidden]{display:none}
.site-top:hover{background:#edf4fb;border-color:#9bbddd}
.site-top .icon{width:22px;height:22px;transform:rotate(180deg)}
.projecting .site-top,body:has(dialog[open]) .site-top{display:none}
dialog::backdrop{background:#0d214d59;backdrop-filter:blur(3px)}
#cart{max-height:calc(100dvh - 40px);overflow:auto}
.question .qref,.question .rail-links a,.question .rail-tip,.intro p,.sideintro p,.sidefoot{color:var(--readable-soft)}
.question .rail-tip,.sidefoot{font-size:11px;line-height:1.8}
.question .question-flags button{font-size:11px;min-height:48px;width:68px;color:var(--readable-soft)}
.question .question-flags button[data-bookmark][aria-pressed=true]{color:#84621c}
.question .question-flags button[data-complete][aria-pressed=true]{color:#14735c}
.question .rail-action{color:#285f99;min-height:44px}
.question .rail-action.secondary{color:#496784}
.badge{color:#395d88}
.tagrow,.sources,.mainfoot{color:var(--readable-soft)}
.solution summary{padding-top:10px;padding-bottom:10px;min-height:44px}
.jumpfilter select{min-height:36px}
button:disabled{cursor:default;opacity:.55}
@media(min-width:981px){
  .layout>#sidebar{position:sticky;top:20px;align-self:start;max-height:calc(100vh - 40px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:#c6d8eb transparent}
}
@media(max-width:760px){
  .site-menu-toggle{width:44px;height:44px}
  .site-plan-link{min-height:44px;padding:10px 13px;font-size:12px}
  .site-links{gap:5px 22px;padding-top:10px;padding-bottom:3px}
  .site-links>a,.site-links summary{font-size:14px}
  .site-course-dropdown{top:44px}
  .site-top{width:44px;height:44px;right:16px;bottom:calc(16px + env(safe-area-inset-bottom))}
  .hero-actions .site-button,.rv-start .site-button{min-height:44px;font-size:12px}
  .rv-proof-card h2{font-size:11px}
  .rv-proof-card p{font-size:10.5px}
  .rv-proof-note{font-size:10px}
  .portal-course-choice .course-card p{font-size:11px}
  .course-row{font-size:12px;min-height:44px}
  .portal-topic-grid a{font-size:13px;min-height:44px}
  .portal-link-grid a{font-size:13px;min-height:44px}
  .portal-detail-note{font-size:12px}
  .rv-section-title p,.rv-detail-cards p,.rv-subscribe p,.feature-preview p{font-size:13px}
  .practice-tabs{font-size:12px}
  .practice-tabs>span,.practice-tabs a{padding:11px 12px;min-height:44px}
  .practice-question-head{font-size:11px}
  .practice-preview .lab-head{font-size:11px}
  .practice-preview .lab-values{font-size:12px}
  .practice-preview .lab-foot,.practice-preview .lab-foot a{font-size:10px}
  .practice-question-tools a,.preview-solution-button{font-size:12px;min-height:44px}
  .practice-question-tools a:last-of-type{color:#285f99;padding:9px 10px}
  .feature-list button{font-size:11px;min-height:48px}
  .feature-preview-art>div>span{font-size:11px}
  .footer-link-groups a{font-size:12px;min-height:36px}
  .footer-bottom{padding-right:48px}
  .course-selector a{font-size:13px;min-height:44px;display:flex;align-items:center}
  .resource-card p{font-size:13px}
  .syllabus-topics a{min-height:44px}
  .billing-toggle button{font-size:13px;min-height:44px}
  .topicselection button,#allTopics,#mobileTopics,#topicDone,.topactions button{min-height:44px}
  .topicbtn{min-height:44px;font-size:12px}
  .filters select,.filters input{font-size:16px;min-height:44px}
  .filters label{font-size:12px}
  .filters .search{flex-basis:100%;width:100%;min-width:0}
  .filters .search input{width:100%;min-width:0}
  .courses button,.filters #reset{font-size:12px;min-height:44px}
  .resultbar{gap:12px;font-size:12px}
  .resultactions{flex-wrap:wrap;gap:8px}
  .resultbar button,.jumpfilter select{min-height:44px;font-size:11px}
  .question .question-flags button{width:48px;font-size:10px;min-height:44px}
  .question .rail-action{font-size:11px;min-height:44px}
  .addpart{min-height:44px;font-size:11px}
  .tagrow button{min-height:32px;font-size:10px}
  .drawerhead button,.cartrowbuttons button,.cartactions button,.printoptions button{min-height:44px;font-size:12px}
  .cartrowbuttons{max-width:100px;gap:4px}
  .cartrowbuttons button{min-width:40px}
  .smallnote{font-size:12px}
}
@media(prefers-reduced-motion:reduce){.site-button,.site-plan-link,.course-row,.resource-card,.feature-list button,.rail-action{transition:none}}
@media print{.site-top{display:none}}