@font-face{font-family:ShelfOnest;src:url('../fonts/onest.ttf') format('truetype');font-weight:100 900;font-display:swap}
/* All changes are scoped to the header and the first section. */
.shelf-header,.shelf-hero{--shelf-bg:#f3f4f6;--shelf-surface:#fcfcfd;--shelf-ink:#1a1a18;--shelf-muted:#70716f;--shelf-line:#e4e5e7;font-family:ShelfOnest,Arial,sans-serif;color:var(--shelf-ink)}
.shelf-header{position:relative;top:auto;background:var(--shelf-surface);border:0}.shelf-header .header-inner{width:min(1040px,calc(100% - 64px));height:96px;gap:24px}.shelf-header .brand{margin-right:auto}.shelf-header .school-name{font-size:20px;line-height:1.1;letter-spacing:-.6px;font-weight:650}.shelf-header .school-name>span{font-family:inherit;font-size:11px;font-weight:400;letter-spacing:0;color:#626360;margin-top:5px}.shelf-header .desktop-nav{font-size:14px;gap:24px;margin:0;font-weight:400}.shelf-header .header-actions{gap:10px}.shelf-header .button{font-family:inherit;min-height:48px;border-radius:14px;font-size:14px;gap:14px;padding:12px 20px}.shelf-header .button .arrow{display:inline;font-size:18px}.shelf-header .menu-toggle{border-radius:14px;border-color:var(--shelf-line);background:var(--shelf-surface)}.shelf-header .mobile-nav{font-size:16px;border-color:var(--shelf-line)}
.shelf-hero{background:var(--shelf-surface);padding:82px 24px 28px;margin:0;isolation:isolate}.shelf-offer{max-width:900px;margin-inline:auto;text-align:center}.shelf-badge{display:inline-flex;align-items:center;min-height:32px;padding:6px 14px;background:#ececee;color:#393a38;border-radius:10px;font-size:13px;font-weight:500;line-height:1.4}.shelf-offer h1{font-family:inherit;font-size:84px;line-height:1.02;letter-spacing:-.03em;font-weight:600;margin:26px 0 0;color:var(--shelf-ink)}.shelf-highlight{display:inline-block;padding:0 .14em .035em;border-radius:22px;background:#dfe9ff;color:var(--shelf-ink);line-height:.99}.shelf-lead{font-size:19px;line-height:1.55;color:#666864;max-width:660px;margin:30px auto 0;font-weight:400;letter-spacing:-.01em}.shelf-cta{display:flex;flex-direction:column;align-items:center;gap:13px;margin-top:32px}.shelf-cta .button{font-family:inherit;font-size:16px;font-weight:500;min-height:56px;padding:16px 24px;border-radius:15px;gap:24px;color:#fff}.shelf-cta>p{font-size:13px;color:#666864;line-height:1.5}.shelf-conditions{font-size:13px;line-height:1.6;color:#666864;margin-top:23px}.shelf-conditions strong{font-weight:500;color:#434540;white-space:nowrap}
.shelf-demo-wrap{background:var(--shelf-bg);border-radius:52px;padding:32px;margin:76px auto 0;max-width:1376px}.shelf-demo{position:relative;background:var(--shelf-surface);border:1px solid var(--shelf-line);border-radius:24px;overflow:hidden;margin:0}.shelf-demo-bar{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--shelf-line);padding:16px 24px}.shelf-demo-person{display:flex;align-items:center;gap:12px}.shelf-demo-person>img{width:38px;height:38px;border-radius:12px;object-fit:cover;object-position:50% 35%}.shelf-demo-person strong{display:block;font-weight:500;font-size:14px;line-height:1.35}.shelf-demo-person div>span{display:block;font-size:11px;color:#70716f;line-height:1.5;margin-top:3px}.shelf-demo-label{font-size:11px;color:#666864;background:#f0f1f2;padding:6px 10px;border-radius:8px;white-space:nowrap}.shelf-workspace{display:grid;grid-template-columns:208px minmax(0,1fr)}.shelf-demo-sidebar{padding:28px 16px;border-right:1px solid var(--shelf-line);font-size:13px;color:#666864}.shelf-demo-sidebar>p:first-child{font-size:11px;margin:0 12px 20px}.shelf-demo-sidebar>div{padding:11px 12px;border-radius:8px;line-height:1.4;font-size:12px}.shelf-sidebar-active{background:#e9eaeb;color:#1a1a18;font-weight:500}.shelf-sidebar-note{font-size:11px;line-height:1.7;margin:38px 12px 0}.shelf-demo-sidebar>a{font-size:11px;display:inline-block;margin:24px 12px 0;color:#2457d6;text-decoration:underline;text-underline-offset:4px}.shelf-demo-main{position:relative;min-width:0;padding:24px 28px 58px}.shelf-demo-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px}.shelf-demo-heading h2{font-family:inherit;font-size:19px;font-weight:500;letter-spacing:-.02em;line-height:1.3}.shelf-demo-heading>span{font-size:11px;color:#70716f;line-height:1.5}.shelf-board{display:block;background:#f3f4f6;border:1px solid #e7e8ea;border-radius:20px;overflow:hidden}.shelf-board img{display:block;width:100%;height:auto}.shelf-solution-note{position:absolute;right:48px;bottom:30px;width:min(390px,calc(100% - 70px));padding:22px 24px;border:1px solid #e0e1e4;border-radius:22px;background:#fcfcfd;box-shadow:0 12px 38px rgb(26 26 24 / .07)}.shelf-note-label{font-size:11px;color:#70716f}.shelf-solution-note>p{font-size:15px;line-height:1.5;margin-top:9px;max-width:340px}.shelf-math{font-family:Montserrat,Arial,sans-serif;font-size:17px;line-height:1.5;margin-top:16px;color:#1a1a18;letter-spacing:-.02em}.shelf-math>span{margin-inline:6px}.shelf-solution-note>a{display:inline-block;font-size:12px;color:#2457d6;margin-top:17px;text-decoration:underline;text-underline-offset:4px}.shelf-demo-caption{padding:16px 24px;border-top:1px solid var(--shelf-line);font-size:11px;line-height:1.6;color:#70716f}.shelf-hero a:focus-visible,.shelf-header a:focus-visible,.shelf-hero button:focus-visible{outline:3px solid #2457d6;outline-offset:4px}
@media(max-width:1100px){.shelf-offer h1{font-size:76px}.shelf-workspace{grid-template-columns:175px minmax(0,1fr)}.shelf-demo-wrap{padding:24px}.shelf-demo-sidebar{padding-inline:10px}.shelf-demo-main{padding-inline:22px}.shelf-solution-note{right:38px;width:340px}.shelf-demo-heading>span{max-width:220px;text-align:right}}
@media(max-width:850px){.shelf-header .header-inner{width:calc(100% - 48px);height:80px}.shelf-hero{padding-top:58px}.shelf-offer h1{font-size:64px}.shelf-lead{font-size:18px}.shelf-demo-wrap{padding:20px;margin-top:60px;border-radius:40px}.shelf-workspace{grid-template-columns:150px minmax(0,1fr)}.shelf-demo-heading>span{display:none}.shelf-solution-note{position:relative;right:auto;bottom:auto;width:auto;margin:18px 0 0;padding:20px;box-shadow:none}.shelf-demo-main{padding:20px}.shelf-demo-sidebar{font-size:12px}.shelf-demo-sidebar>div{font-size:11px;padding-inline:10px}.shelf-demo-caption{font-size:10px}.shelf-demo-bar{padding-inline:20px}}
@media(max-width:620px){.shelf-header .header-inner{width:calc(100% - 40px);height:76px;gap:12px}.shelf-header .school-name{font-size:17px}.shelf-header .school-name>span{font-size:10px}.shelf-header .header-actions{gap:8px}.shelf-header .header-actions>.button{font-size:12px;padding:11px 13px;gap:8px;min-height:46px}.shelf-header .button .arrow{font-size:15px}.shelf-header .menu-toggle{width:40px;height:46px}.shelf-hero{padding:48px 16px 20px}.shelf-offer{max-width:540px}.shelf-badge{font-size:11px;min-height:28px;padding:5px 12px;border-radius:8px}.shelf-offer h1{font-size:46px;line-height:1.045;letter-spacing:-.022em;margin-top:24px}.shelf-highlight{border-radius:13px;padding-inline:.12em}.shelf-lead{font-size:16px;line-height:1.55;max-width:330px;margin-top:24px}.shelf-lead br{display:none}.shelf-cta{margin-top:28px;gap:12px}.shelf-cta .button{font-size:15px;min-height:54px;padding:15px 21px;gap:20px;border-radius:14px}.shelf-cta>p{font-size:12px}.shelf-conditions{font-size:11px;max-width:290px;margin:22px auto 0;line-height:1.8}.shelf-conditions strong{display:block}.shelf-demo-wrap{margin-top:44px;padding:12px;border-radius:28px}.shelf-demo{border-radius:20px}.shelf-demo-bar{padding:15px 14px;min-height:76px;gap:10px}.shelf-demo-person{gap:9px}.shelf-demo-person strong{font-size:12px}.shelf-demo-person>img{width:34px;height:34px;border-radius:10px}.shelf-demo-person div>span{font-size:9px;max-width:190px}.shelf-demo-label{display:none}.shelf-workspace{display:block}.shelf-demo-sidebar{display:none}.shelf-demo-main{padding:18px 12px}.shelf-demo-heading{margin-bottom:14px}.shelf-demo-heading h2{font-size:17px}.shelf-board{border-radius:14px}.shelf-solution-note{border-radius:16px;padding:18px;margin-top:14px}.shelf-solution-note>p{font-size:14px}.shelf-math{font-size:15px;letter-spacing:-.025em;white-space:nowrap}.shelf-math>span{margin-inline:3px}.shelf-note-label{font-size:10px}.shelf-solution-note>a{font-size:11px;margin-top:14px}.shelf-demo-caption{padding:14px;font-size:10px}}
@media(max-width:390px){.shelf-offer h1{font-size:43px;letter-spacing:-.025em}.shelf-hero{padding-inline:12px}.shelf-math{font-size:14px}}
@media(max-width:360px){.shelf-header .school-name{font-size:16px}.shelf-header .school-name>span{font-size:9px}.shelf-header .header-actions>.button{font-size:11px;padding-inline:11px}.shelf-offer h1{font-size:40px;letter-spacing:-.025em}.shelf-demo-person strong{font-size:11px}.shelf-demo-person div>span{font-size:8px}.shelf-solution-note{padding:16px}}
@media(prefers-reduced-motion:reduce){.shelf-header *,.shelf-hero *{transition:none!important}}
.shelf-exam{white-space:nowrap}.shelf-board img{max-height:600px;object-fit:contain;background:#f3f4f6}
@media(max-width:620px){.shelf-board img{max-height:none;height:auto}}
/* Onest has complete Cyrillic; its missing square-root glyph is supplied explicitly. */
@font-face{font-family:ShelfMathSymbols;src:url('../fonts/golos-400.ttf') format('truetype');font-weight:400;unicode-range:U+221A;font-display:swap}
.shelf-math{font-family:ShelfOnest,ShelfMathSymbols,Arial,sans-serif}
/* Navigation and interactive lesson demonstration. */
html{scroll-behavior:smooth;scroll-padding-top:112px}.shelf-header{position:sticky;top:0;z-index:40;border-bottom:1px solid #e4e5e7}.shelf-header .header-inner{width:min(1240px,calc(100% - 48px));height:84px;gap:24px}.shelf-header .desktop-nav{gap:18px;font-size:13px}.shelf-header .mobile-nav{position:absolute;top:100%;left:0;right:0;max-height:calc(100dvh - 100px);overflow:auto;background:#fcfcfd;box-shadow:0 12px 24px rgb(26 26 24 / .06)}.shelf-header .mobile-nav .container{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.back-to-top{position:fixed;bottom:max(24px,env(safe-area-inset-bottom));right:24px;z-index:35;width:48px;height:48px;display:flex;align-items:center;justify-content:center;border:1px solid #d7dce4;border-radius:15px;background:#fcfcfd;color:#2457d6;box-shadow:0 4px 18px rgb(26 26 24 / .07);font:400 27px ShelfOnest,Arial,sans-serif}.back-to-top:hover{background:#dfe9ff}.back-to-top:active{background:#cbdcff}.back-to-top:focus-visible{outline:3px solid #2457d6;outline-offset:4px}
.shelf-demo-sidebar .demo-stage-tabs{display:flex;flex-direction:column;gap:6px;padding:0;border-radius:0}.demo-stage-tabs button{border:0;background:transparent;color:#666864;text-align:left;font:400 13px/1.4 ShelfOnest,Arial,sans-serif;padding:12px;border-radius:10px;min-height:44px}.demo-stage-tabs button[aria-selected=true]{background:#dfe9ff;color:#1a1a18;font-weight:500}.demo-stage-tabs button:hover{background:#eeeff1;color:#1a1a18}.demo-stage-tabs button:focus-visible,.demo-subject-tabs button:focus-visible{outline:3px solid #2457d6;outline-offset:2px}.shelf-demo-main [role=tabpanel]:focus-visible{outline:2px solid #2457d6;outline-offset:8px;border-radius:12px}.demo-subject-tabs{display:flex;gap:8px;margin-bottom:24px}.demo-subject-tabs button{padding:10px 17px;border:1px solid #e4e5e7;border-radius:12px;background:transparent;color:#666864;font:400 13px ShelfOnest,Arial,sans-serif;min-height:44px}.demo-subject-tabs button[aria-selected=true]{background:#1a1a18;color:white;border-color:#1a1a18}.demo-subject-tabs button:hover{border-color:#2457d6}.demo-inline-note{margin-top:20px;padding:22px;background:#f3f4f6;border-radius:20px;font-size:16px;line-height:1.6}.demo-inline-note .text-link{font-size:13px;display:inline-block;margin-top:15px}.demo-text-button{border:0;background:transparent;padding:10px 0;color:#2457d6;font:500 13px ShelfOnest,Arial,sans-serif;text-decoration:underline;text-underline-offset:4px;display:block;margin-top:10px}.algebra-board-crop{width:100%;aspect-ratio:1124 / 465;overflow:hidden;background:#f3f4f6;border:1px solid #e4e5e7;border-radius:20px}.algebra-board-crop img{display:block;width:100%;height:auto;max-height:none}.demo-intro{font-size:15px;color:#666864;line-height:1.65;max-width:760px;margin-bottom:26px}.checking-grid{display:grid;grid-template-columns:minmax(200px,.8fr) minmax(0,1.2fr);gap:28px;align-items:start}.demo-chat{max-width:320px;width:100%;margin-inline:auto}.demo-chat img{max-height:530px;width:auto;max-width:100%;border-radius:18px;object-fit:contain}.demo-chat figcaption{font-size:11px;color:#666864;margin-top:12px}.progress-preview{padding:26px;background:#f3f4f6;border:1px solid #e4e5e7;border-radius:20px}.progress-preview h3{font:500 23px/1.25 ShelfOnest,Arial,sans-serif;letter-spacing:-.4px}.progress-preview>p{font-size:14px;color:#666864;margin-top:16px}.progress-table-wrap{margin-top:24px;max-width:100%}.progress-example{width:100%;border-collapse:collapse;table-layout:fixed;font-size:12px;background:#fcfcfd}.progress-example caption{text-align:left;font-size:11px;color:#666864;line-height:1.5;margin-bottom:12px}.progress-example th,.progress-example td{padding:12px 8px;border:1px solid #d9dde1;text-align:left;overflow-wrap:anywhere}.progress-example thead th{background:#e7edf6;font-weight:500}.progress-example tbody th{font-weight:500}.checked-cell{background:#e4f0dd;color:#254021}.parent-note{font-size:13px;line-height:1.65;margin-top:20px;border-top:1px solid #dce1e6;padding-top:20px}.progress-preview>p.demo-small,.demo-small{font-size:11px;color:#666864;line-height:1.6;margin-top:18px}.algebra-explanation{display:grid;gap:28px}.algebra-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));padding-left:22px;gap:24px;font-size:15px;line-height:1.55}.algebra-steps strong{display:block;font-weight:500}.algebra-steps .shelf-math{display:block}.algebra-steps p{font-size:13px;color:#666864;margin-top:12px}.algebra-second-example{background:#dfe9ff;padding:24px;border-radius:20px;font-size:15px;line-height:1.6}.algebra-second-example>strong{font-weight:500}.algebra-second-example .shelf-math{display:block;font-size:21px;margin-top:14px}.algebra-second-example p{font-size:13px;margin-top:16px}.shelf-demo-heading h2{font-size:22px;line-height:1.3;max-width:760px}.shelf-demo-heading>span{flex-shrink:0}
.review-grid{gap:24px}.review-card{border:1px solid #e4e5e7;border-radius:24px;padding:28px;background:#fcfcfd;min-width:0}.review-stars{font-family:Arial,sans-serif;font-size:21px;letter-spacing:3px;color:#906600;line-height:1.3;margin-bottom:20px}.review-card .review-name{font-weight:500;font-size:18px}.review-card .review-date{font-size:12px}.review-card blockquote{font-size:16px;line-height:1.65}.review-card .review-source{font-size:11px}
@media(max-width:1150px){.shelf-header .desktop-nav{display:none}.shelf-header .menu-toggle{display:flex}.shelf-header .header-inner{height:80px}.checking-grid{grid-template-columns:1fr}.demo-chat img{max-height:400px}.progress-preview{padding:24px}}
@media(max-width:850px){.review-grid{grid-template-columns:1fr 1fr}.shelf-demo-heading{display:block}.shelf-demo-heading>span{display:block;text-align:left;margin-top:8px}.algebra-steps{grid-template-columns:1fr;gap:22px}.shelf-demo-sidebar .demo-stage-tabs{gap:8px}.demo-stage-tabs button{font-size:12px}}
@media(max-width:620px){html{scroll-padding-top:96px}.shelf-header .header-inner{height:76px;width:calc(100% - 40px)}.shelf-header .mobile-nav .container{grid-template-columns:1fr 1fr;font-size:14px;gap:0 14px}.back-to-top{right:16px;bottom:max(16px,env(safe-area-inset-bottom));width:46px;height:46px}.shelf-demo-sidebar{display:block;padding:14px 12px;border-right:0;border-bottom:1px solid #e4e5e7}.shelf-demo-sidebar>p:first-child,.shelf-sidebar-note,.shelf-demo-sidebar>a{display:none}.shelf-demo-sidebar .demo-stage-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.demo-stage-tabs button{padding:10px 5px;font-size:11px;line-height:1.35;min-height:52px;text-align:center}.demo-subject-tabs{margin-bottom:18px}.demo-subject-tabs button{font-size:12px;padding-inline:14px}.shelf-demo-heading h2{font-size:19px}.shelf-demo-heading>span{font-size:11px;max-width:100%}.demo-intro{font-size:14px;margin-bottom:22px}.demo-inline-note{font-size:14px;padding:18px}.checking-grid{gap:24px}.demo-chat img{max-height:470px;width:100%}.demo-chat figcaption{font-size:10px}.progress-preview{padding:18px}.progress-preview h3{font-size:21px}.progress-preview>p{font-size:13px}.progress-example{font-size:11px}.progress-example th,.progress-example td{padding:10px 5px}.progress-example th:first-child{width:22%}.parent-note{font-size:12px}.algebra-board-crop{border-radius:14px}.algebra-steps{font-size:14px;margin-block:0}.algebra-second-example{padding:18px}.algebra-second-example .shelf-math{font-size:16px;white-space:normal}.review-grid{grid-template-columns:1fr;gap:18px}.review-card{padding:24px;border-radius:20px}.review-card blockquote{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.demo-stage-tabs button[aria-selected=true]:hover{background:#dfe9ff}
/* Results have their own section and a vertical card layout. */
.student-results-section{font-family:ShelfOnest,Arial,sans-serif}.student-results-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.student-result-card{display:flex;flex-direction:column;align-items:flex-start;gap:18px;padding:36px;border:1px solid #e0e3e8;border-radius:26px;background:#fcfcfd;min-width:0}.result-subject{font-size:14px;color:#62666b}.student-result-value{display:flex;align-items:baseline;flex-wrap:wrap;gap:12px;color:#1a1a18;line-height:1.05}.student-result-value strong{font-size:78px;font-weight:600;letter-spacing:-.04em}.student-result-value>span{font-size:24px}.student-result-grade{background:#dfe9ff;color:#1a1a18;border-radius:12px;font-size:18px;font-weight:500;padding:8px 14px}.student-result-date{font-size:14px;color:#62666b}.student-result-card>.text-link{font-size:15px;white-space:normal;line-height:1.6;overflow-wrap:anywhere;max-width:100%;margin-top:6px}.student-results-note{font-size:13px;color:#62666b;margin-top:26px;max-width:800px;line-height:1.7}.review-profile-link{margin-top:28px;font-size:15px;line-height:1.7;max-width:100%}.review-profile-link .text-link{white-space:normal;overflow-wrap:anywhere}.review-card{overflow-wrap:anywhere}.geometry-practice{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:start}.practice-triangle{background:#f3f4f6;border-radius:20px;padding:20px;min-width:0}.practice-triangle svg{width:100%;height:auto;display:block}.practice-triangle figcaption{font-size:12px;color:#666864;margin-top:10px}.worked-example{background:#f3f4f6;border-radius:20px;padding:26px;min-width:0}.lesson-label{font-size:12px;color:#666864;margin-bottom:16px}.worked-example ol{margin:0;padding-left:20px;font-size:15px;line-height:1.6}.worked-example li+li{margin-top:24px}.worked-example strong{font-weight:500}.lesson-equation{display:block;white-space:normal;font-size:20px;line-height:1.8;overflow-wrap:normal}.lesson-equation>span{display:block;max-width:100%}.worked-example .lesson-equation{font-size:17px}.lesson-answer{border-top:1px solid #dce0e6;padding-top:18px;margin-top:22px;font-size:16px;font-weight:500}.question-prompt{padding:22px 24px;margin-top:24px;background:#dfe9ff;border-radius:20px;font-size:15px;line-height:1.6}.question-prompt .demo-text-button{font-size:15px;margin:3px 0 0;min-height:44px}.algebra-task{padding:28px;margin-bottom:22px;background:#dfe9ff;border-radius:20px}.task-equation{font-size:30px;font-weight:500;letter-spacing:-.025em;margin-top:0}.student-question{margin-block:8px 24px}.student-question>span{font-size:12px;color:#666864;display:block;margin-bottom:12px}.student-question h2{font:500 30px/1.2 ShelfOnest,Arial,sans-serif;letter-spacing:-.03em}.trig-formulas{display:grid;grid-template-columns:1fr 1fr;gap:16px}.trig-formulas>div{padding:22px;border:1px solid #e4e5e7;border-radius:18px;background:#f3f4f6;min-width:0}.trig-formulas strong{display:block;font-size:14px;font-weight:500}.trig-formulas .shelf-math{display:block;white-space:normal;font-size:21px}.lesson-board-details{margin-top:26px;padding-top:18px;border-top:1px solid #e4e5e7;font-size:14px}.lesson-board-details summary{cursor:pointer;min-height:44px;padding:10px 0}.lesson-board-details .shelf-board{margin-top:16px}.module-explanation{margin-block:24px;font-size:15px;line-height:1.7}.module-explanation>p{color:#62666b;margin-top:20px}.module-explanation .lesson-equation{font-size:23px}.algebra-second-example .lesson-equation{white-space:normal}.student-results-section h2{font-family:ShelfOnest,Arial,sans-serif}
@media(max-width:1250px){.shelf-header .desktop-nav{display:none}.shelf-header .menu-toggle{display:flex}}
@media(max-width:850px){.geometry-practice{grid-template-columns:1fr}.student-result-card{padding:28px}.student-result-value strong{font-size:68px}.worked-example .lesson-equation{font-size:17px}.task-equation{font-size:27px}}
@media(max-width:620px){.student-results-grid{grid-template-columns:1fr;gap:18px}.student-result-card{padding:26px;gap:16px;border-radius:22px}.student-result-value strong{font-size:64px}.student-result-value>span{font-size:22px}.student-result-grade{font-size:16px}.student-result-card>.text-link{font-size:14px}.student-results-note{font-size:12px}.review-profile-link{font-size:14px}.worked-example{padding:20px}.practice-triangle{padding:16px}.worked-example ol{font-size:14px}.worked-example .lesson-equation{font-size:15px;letter-spacing:-.02em}.question-prompt{padding:18px;font-size:14px}.question-prompt .demo-text-button{font-size:14px}.algebra-task{padding:20px}.task-equation{font-size:23px}.student-question h2{font-size:25px}.trig-formulas{grid-template-columns:1fr}.trig-formulas .shelf-math{font-size:20px}.module-explanation .lesson-equation{font-size:18px}.algebra-second-example .lesson-equation{font-size:16px}.lesson-equation{font-size:18px}.student-results-section h2{font-size:33px}}

/* Reading order and the preparation route. */
.shelf-hero:not(.lesson-examples){padding-bottom:80px}
.lesson-examples.shelf-hero{padding:80px 24px;background:#fcfcfd}
.lesson-examples .section-heading{max-width:1200px;margin-inline:auto}
.lesson-examples .section-heading h2{font-family:ShelfOnest,Arial,sans-serif;font-size:52px;font-weight:600;line-height:1.06;letter-spacing:-.03em}
.lesson-examples .section-intro{color:#62666b}
.lesson-examples .shelf-demo-wrap{margin-top:40px}
.lesson-examples :is(a,button,[role="tabpanel"]):focus-visible{outline:3px solid #2457d6;outline-offset:4px}
.route-details summary{min-height:56px}
.route-roadmap{padding-top:32px;--route-line:#cbd3df;--route-muted:#526070}
.route-roadmap :is(h3,h4){letter-spacing:-.025em;line-height:1.3;color:#1a1a18}
.route-roadmap h3{font-size:23px}
.route-roadmap p{font-size:15px;line-height:1.65;color:var(--route-muted)}
.roadmap-start,.roadmap-recurring{display:flex;align-items:flex-start;gap:20px;padding:26px 28px;border-radius:24px;background:#f3f4f6}
.roadmap-start p,.roadmap-recurring p{margin-top:8px;max-width:780px}
.roadmap-start-icon,.roadmap-recurring>span{flex:0 0 40px;display:grid;place-items:center;font:400 28px/1 ShelfOnest,Arial,sans-serif;color:#526070;min-height:40px}
.roadmap-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:80px;margin-block:40px}
.roadmap-description{margin-top:8px}
.roadmap-track{list-style:none;padding:0;margin:24px 0 0}
.roadmap-step{position:relative;display:grid;grid-template-columns:60px minmax(0,1fr);gap:24px;align-items:center;min-height:76px;padding:10px 0}
.roadmap-step:not(:last-child)::after{content:'';position:absolute;top:50%;bottom:-50%;left:29px;width:2px;background:var(--route-line);z-index:0}
.roadmap-node{position:relative;z-index:1;display:grid;place-items:center;min-height:48px;width:60px;border:1px solid var(--route-line);background:#fcfcfd;border-radius:14px;font-size:15px;font-weight:600;color:#1a1a18;white-space:nowrap}
.roadmap-step h4{font-size:18px;font-weight:500;padding:16px 0;border-bottom:1px solid #e4e5e7}
.roadmap-step:last-child h4{border-bottom:0}
.roadmap-side{min-width:0;padding-top:62px}
.roadmap-branch{position:relative;padding:28px;border:1px dashed #b6c0d0;border-radius:24px;background:#f3f4f6}
.roadmap-branch::before{content:'';position:absolute;top:35px;right:100%;width:40px;border-top:2px dashed #b6c0d0}
.roadmap-branch .roadmap-branch-label{font-size:12px;font-weight:500;margin-bottom:14px;color:#526070}
.roadmap-branch>p:not(.roadmap-branch-label){margin-top:16px}
.story-track{margin:24px 0 0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:10px 0;font-size:14px;line-height:1.7;color:#1a1a18}
.story-track li{display:flex;align-items:center}
.story-track li:not(:last-child)::after{content:'→';margin:0 10px;color:#727c89}
.roadmap-adaptation{padding:24px 8px 0}
.roadmap-recurring{background:#dfe9ff}
.roadmap-recurring p{color:#303d50}
@media(max-width:850px){.roadmap-layout{gap:40px;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}.roadmap-branch::before{width:20px}.roadmap-branch{padding:24px}.lesson-examples .section-heading h2{font-size:42px}.roadmap-step{gap:16px}.roadmap-step h4{font-size:16px}}
@media(max-width:620px){.shelf-hero:not(.lesson-examples){padding-bottom:48px}.lesson-examples.shelf-hero{padding:48px 12px}.lesson-examples .section-heading{width:calc(100% - 16px)}.lesson-examples .section-heading h2{font-size:34px}.lesson-examples .shelf-demo-wrap{margin-top:28px}.route-roadmap{padding-top:24px}.roadmap-layout{display:block;margin-block:28px}.roadmap-start,.roadmap-recurring{padding:20px;gap:12px;border-radius:20px}.route-roadmap h3{font-size:20px}.route-roadmap p{font-size:14px}.roadmap-start-icon,.roadmap-recurring>span{flex-basis:24px;font-size:24px;min-height:28px}.roadmap-step{grid-template-columns:56px minmax(0,1fr);min-height:70px;gap:16px}.roadmap-node{width:56px;min-height:44px;font-size:14px;border-radius:12px}.roadmap-step:not(:last-child)::after{left:27px}.roadmap-step h4{font-size:16px;letter-spacing:-.025em}.roadmap-side{padding-top:28px}.roadmap-branch::before{display:none}.roadmap-branch{padding:22px}.roadmap-adaptation{padding:18px 4px 0}.story-track{font-size:14px}}

/* Separate the adjacent pricing and FAQ sections. */
#prices{background:#f3f4f6;padding-bottom:88px}
#prices .price-card{background:#fcfcfd;border:1px solid #dce3eb;border-radius:24px}
#prices .price-card-featured{border-color:#9aa9bf}
#faq{background:#fcfcfd;border-top:1px solid #dce3eb;border-radius:48px 48px 0 0;padding-top:88px}
#faq .faq-item:first-child{border-top-color:#b9c4d2}
@media(max-width:620px){#prices{padding-bottom:56px}#prices .price-card{border-radius:20px}#faq{border-radius:28px 28px 0 0;padding-top:56px}}

/* One consistent rhythm across all eleven full-width content sections. */
main > section{background:#fcfcfd}
main > #for-whom,
main > #format,
main > #program,
main > #reviews,
main > #faq{background:#f3f4f6}
main > #teacher,
main > #results,
main > #prices,
main > #contact{background:#fcfcfd}
#prices .price-card{background:#f3f4f6}
#prices .price-card-featured{background:#fcfcfd;border-color:#9aa9bf}
#results .student-result-card{background:#f3f4f6}
#reviews .review-card{background:#fcfcfd}
#program .roadmap-start,
#program .roadmap-branch{background:#fcfcfd}

/* Lead with the session price; keep the package total explicit. */
.price-comparison{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin-top:28px;width:100%}
.price-alternative{display:flex;flex-direction:column;gap:8px;color:#526070}
.price-alternative>span{font-size:12px;line-height:1.4}
.price-alternative s{font-size:28px;line-height:1.2;white-space:nowrap;text-decoration-thickness:1.5px}
.price-current .price{margin:0;line-height:1.15;white-space:nowrap;color:#2457d6}
.price-current .price-unit{margin-top:8px}
.price-month{margin:24px 0 0;padding-top:20px;border-top:1px solid #dce3eb;width:100%;font-size:17px;line-height:1.6}
.price-month strong{font-weight:500;display:block;color:#17212f}
.price-month>span{display:block;font-size:13px;color:#526070;margin-top:3px}
@media(max-width:620px){.price-comparison{gap:16px;margin-top:24px}.price-alternative s{font-size:23px}.price-alternative>span{font-size:10px}.price-current .price{font-size:36px;letter-spacing:-1.5px}.price-current .price-unit{font-size:11px}.price-month{font-size:16px}}
@media(max-width:375px){.price-comparison{gap:12px}.price-alternative s{font-size:21px}.price-current .price{font-size:33px}}

/* Confirmed experience supports the offer without crowding the first screen. */
.hero-proof{display:flex;justify-content:center;flex-wrap:wrap;gap:28px 40px;margin:32px auto 0;max-width:850px}
.hero-proof>p,.hero-proof>a{text-align:center;color:#1a1a18;line-height:1.5}
.hero-proof strong{display:block;font-size:19px;font-weight:600;letter-spacing:-.02em}
.hero-proof span{display:block;font-size:12px;color:#526070;margin-top:3px}
.hero-proof>a{text-decoration:none;text-underline-offset:4px}
.hero-proof>a:hover strong{text-decoration:underline}
.teacher-results-link{margin-top:24px;font-size:15px;line-height:1.6}
@media(max-width:620px){.hero-proof{gap:20px 24px;margin-top:28px}.hero-proof strong{font-size:17px}.hero-proof span{font-size:11px}.hero-proof>a{flex-basis:100%}.teacher-results-link{font-size:14px}}

/* Benefits belong to the course, not to a payment option. */
.course-includes{margin-top:28px;padding:28px 32px;background:#f3f4f6;border-radius:24px}
.course-includes h3{font-size:22px;line-height:1.35;font-weight:500;letter-spacing:-.025em}
.course-includes ul{display:grid;grid-template-columns:1fr 1fr;gap:16px 40px;margin:24px 0 0;padding-left:20px;font-size:15px;line-height:1.65}
.course-includes li::marker{color:#2457d6}
.payment-description{margin-block:24px}
@media(max-width:620px){.course-includes{padding:24px;border-radius:20px}.course-includes h3{font-size:20px}.course-includes ul{grid-template-columns:1fr;gap:12px;margin-top:20px;font-size:14px}}