/* Visual lessons: warm canvas, strong diagrams and a quiet reading hierarchy. */
:root{--canvas:#f9e9dd;--paper:#fffaf5;--cream:#fff8ed;--ink:#112a35;--ink-soft:#40514e;--muted:#5b6d65;--hair:#decfc1;--teal:#b93417;--teal-dark:#982a12;--teal-faint:#f7ded0;--shadow:none;--radius:10px;--display:Inter,'Segoe UI',Arial,sans-serif}
.content-wrap{background:var(--canvas)}
.topbar{padding:20px 42px 8px;min-height:68px;background:transparent}.topbar-location{display:flex;align-items:center;gap:12px}.topbar-title{font:600 14px var(--display);color:#4e6259}.back-to-lessons{display:flex;gap:8px;align-items:center;background:none;border:0;color:#4e6259;font-weight:650;padding:10px 0}.timer,.topbar .btn{background:transparent;border-color:#cbbbaf;border-radius:6px}.topbar .btn{min-height:40px}.timer{min-height:40px}
.sync-banner{margin:0 42px;padding:7px 0;background:none;border:0;border-radius:0;font-size:11px;color:#53635a}.sync-banner .btn{font-size:11px;padding:4px 8px;min-height:32px}
main.main{padding:22px 42px 42px;width:min(1500px,100%)}
h1,.main h2,.main h3,.guide-cover h1,.guide-chapter-heading h1,.guide-section-heading h2,.guide-chapter-card h3{font-family:var(--display);color:var(--ink);font-weight:750;letter-spacing:-.035em}.main h1{font-weight:780}.main h2{font-size:27px}.main h3{font-size:19px}
.btn{border-radius:6px;min-height:44px;box-shadow:none}.btn-primary{background:#bd3515;border-color:#bd3515;color:white;padding:12px 22px}.btn-primary:hover{background:#99290f}.btn-outline{background:transparent;border-color:#89958a;color:#2f483c}.btn-quiet{color:#355145}.btn:focus-visible,summary:focus-visible,button:focus-visible{outline:3px solid #173b49;outline-offset:4px}
.eyebrow{color:#63705d;font-size:10px;letter-spacing:.12em}.panel,.quiz-card,.module-card{box-shadow:none;border-radius:9px;border-color:var(--hair);background:#fffaf5}.main>.panel{margin-top:22px}.notice{background:#f4dfcf;border-radius:5px;color:#36473d}.textarea{background:#fffaf5;border-color:#c8b7a7;border-radius:5px}.page-foot{border-top:1px solid var(--hair);font-size:10px;margin-top:40px}
/* Dashboard: a single invitation to learn, followed by a simple subject index. */
.visual-welcome{padding:22px 0 32px}.visual-welcome h1{font-size:clamp(40px,4.5vw,68px);line-height:1.03;margin:14px 0 18px}.visual-welcome>p:last-child{font-size:17px;margin:0}.visual-next{display:grid;grid-template-columns:minmax(180px,.7fr) minmax(0,1.5fr);gap:40px;align-items:center;border-top:1px solid #c9b8a7;border-bottom:1px solid #c9b8a7;padding:30px 0 34px}.visual-next-copy h2{font-size:clamp(25px,2.7vw,38px);max-width:28ch;line-height:1.15;margin:12px 0 18px}.visual-next-copy>p:not(.eyebrow){max-width:65ch;line-height:1.75;font-size:16px}.next-duration{display:block;color:#5b685d;font-size:12px;margin-top:12px}.visual-next-art{position:relative;min-height:240px;max-width:320px;width:100%;margin:auto}.art-circle{width:180px;height:180px;position:absolute;top:0;left:0;border-radius:50%;background:conic-gradient(#ef481f 0 75%,#f0c6ab 75%);border:3px solid #30483b}.art-grid{position:absolute;right:0;bottom:0;width:140px;height:140px;border:3px solid #30483b;background:repeating-linear-gradient(90deg,transparent 0 31px,#30483b 31px 34px),repeating-linear-gradient(0deg,#ead4ac 0 31px,#30483b 31px 34px);transform:rotate(-6deg)}.art-arrow{position:absolute;right:18px;top:-8px;color:#30483b;font-size:80px;font-weight:300}
.visual-subjects{margin-top:35px}.visual-subjects .section-head h2{font-size:24px}.visual-subject-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.visual-subject{position:relative;display:flex;flex-direction:column;align-items:start;text-align:left;gap:14px;min-width:0;background:none;border:0;border-top:2px solid #30483b;padding:20px 0 12px;color:#233d34}.visual-subject:hover{background:#f5dfcf}.visual-subject .subject-number{position:absolute;right:0;top:20px;font-size:12px;color:#667466}.visual-subject strong{font-size:18px;line-height:1.3}.visual-subject>span:last-child{display:flex;justify-content:space-between;width:100%;align-items:center;font-size:12px}.visual-record{border-top:1px solid var(--hair);margin-top:30px;padding-top:20px;display:flex;align-items:center;gap:26px;flex-wrap:wrap}.visual-record p{font-size:12px;margin:0}.visual-record strong{display:block;font-size:20px;color:var(--ink)}.visual-record>.btn{margin-left:auto;font-size:12px}
/* A compact lesson header leaves the teaching itself in the foreground. */
.lesson-head{background:none;border:0;box-shadow:none;padding:0;margin:0 0 12px;border-radius:0}.lesson-head:after{content:none}.lesson-head h1{font-size:19px;font-weight:650;letter-spacing:-.015em;max-width:none;margin:0}.lesson-head .eyebrow{margin:0 0 6px;font-size:9px}.module-tabs{border-radius:0;background:none;border-bottom:1px solid var(--hair);padding:0;gap:20px;width:100%;margin:0 0 22px;flex-wrap:wrap}.module-tab{border:0;border-bottom:2px solid transparent;border-radius:0;padding:10px 0;background:none;font-size:12px;color:#57645a;font-weight:600;box-shadow:none}.module-tab.active{border-color:#b93417;color:#982a12;background:none;box-shadow:none}.teaching-layout{display:block}.teaching-screen{background:transparent;border:0;border-radius:0;padding:0;box-shadow:none;min-width:0}.teaching-position{font-size:12px;font-weight:450;letter-spacing:0;color:#5f6c60}.teaching-progress{height:2px;margin:10px 0 0;opacity:.6}.teaching-screen h2{font-size:clamp(32px,3.4vw,52px);line-height:1.1;margin:17px 0 34px;scroll-margin-top:24px}.teaching-screen h3{margin:0 0 12px}.teaching-screen p{line-height:1.75}.teaching-screen>.depth-prose,.teaching-screen>.teaching-lead{max-width:75ch;font-size:18px}.teaching-screen>.depth-example,.teaching-screen>.teaching-pause{max-width:900px}.teaching-navigation{border-top:0;margin-top:22px;padding:10px 0;align-items:center}.teaching-navigation>.btn-primary{font-size:17px;min-width:150px}.teaching-navigation>.btn-outline{border:0;padding-left:0;font-size:13px}.teaching-side{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:18px;margin-top:24px;border-top:1px solid var(--hair);padding-top:6px}.teaching-side>.panel{padding:0;background:none;border:0;border-radius:0;min-width:0}.lesson-tools summary,.lesson-extra summary{font-weight:600;font-size:13px;min-height:44px;padding:14px 0;color:#425b4b}.lesson-tools[open] summary{margin-bottom:8px}.lesson-tools textarea{min-height:160px}.lesson-extra{border-top:1px solid var(--hair);margin-top:24px}.lesson-extra[open]{max-width:850px;padding-bottom:15px}.lesson-extra summary{cursor:pointer}.lesson-outline{padding-left:20px;gap:3px}.lesson-outline button{font-size:13px}.beginner-glossary{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}.beginner-glossary>div{background:transparent;padding:5px 16px;border-color:#b93417}.why-card{background:transparent;border-left:2px solid #b93417;padding:0 0 0 20px;margin-top:28px;border-radius:0}.why-card p{font-size:15px}.depth-example,.teaching-pause{background:#fff5ec;border:1px solid var(--hair);border-radius:7px;padding:24px}.depth-example{margin:24px 0}.depth-example h3{font-size:18px}.reasoning-map{gap:14px}.diagram-explanation{background:#f2d9c7;border-radius:5px}.teaching-reveal{background:#fff5ec;border-color:var(--hair)}
/* Fractions are a real accessible vector diagram, with a working circle/bar switch. */
.fraction-introduction{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(30px,5vw,85px);align-items:center}.fraction-picture{margin:0;max-width:500px;width:100%;align-self:center}.fraction-picture figcaption{font-size:22px;color:#30483b;font-weight:650;margin:0 0 5px}.intro-fraction-circle{width:100%;display:block;max-height:430px}.fraction-picture-label{text-align:right;font-size:17px;font-weight:650;color:#30483b;margin:8px 0 0}.fraction-copy h3{font-size:clamp(24px,2.4vw,35px);line-height:1.3;margin:0 0 24px;letter-spacing:-.02em}.fraction-copy>.btn{margin-bottom:25px}.fraction-copy p{font-size:17px;color:#18303a}.fraction-copy .small{font-size:13px;color:#4e6056}.fraction-caption{font-weight:650;font-size:20px!important;margin:0}.fraction-equation{font-size:clamp(40px,5.5vw,78px);font-weight:750;display:flex;gap:20px;align-items:center;letter-spacing:-.045em;margin:12px 0 25px;white-space:nowrap}.stacked-fraction{display:grid;line-height:1;text-align:center;letter-spacing:0}.stacked-fraction>span:first-child{border-bottom:4px solid #18303a;padding:0 10px 9px}.stacked-fraction>span:last-child{padding-top:8px}.intro-fraction-bar{display:grid;grid-template-columns:repeat(4,1fr);border:3px solid #30483b;height:150px;margin:80px 0}.intro-fraction-bar>span{background:#fff8ed;border-right:3px solid #30483b}.intro-fraction-bar>span:last-child{border-right:0}.intro-fraction-bar>.taken{background:#ef481f}.visual-introduction.has-diagram{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px;align-items:start}.intro-copy>.teaching-lead{font-size:21px;line-height:1.65;color:var(--ink)}.intro-diagram{min-width:0}.intro-diagram .teaching-diagram>h3{font-size:20px;margin-bottom:20px}.intro-diagram .teaching-diagram>.eyebrow{display:none}.intro-diagram .visual-flow{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.intro-diagram .flow-node{font-size:14px;min-width:0}.intro-diagram .flow-node:after{display:none}.intro-diagram .teaching-diagram>.small{font-size:11px;margin-top:20px}.intro-diagram .hundred-grid{max-width:340px}.intro-diagram .relationship-diagram{gap:12px}.intro-diagram .relation-person{font-size:14px}.intro-diagram .relation-link{font-size:12px}.intro-diagram .equal-groups{grid-template-columns:repeat(2,1fr)}.intro-diagram .fraction-strip{grid-template-columns:repeat(2,1fr)}.flow-node.active{background:#b93417;border-color:#b93417}.fraction-strip .filled,.hundred-grid .filled{background:#b93417}.flow-node{border-radius:6px}.intro-diagram .diagram-explanation{padding:18px}.intro-diagram .land-figure{margin:0}.intro-diagram svg{max-width:100%}
/* Carry the palette through courses, practice and the guide. */
.section-top{padding:8px 0 22px;border-bottom:1px solid var(--hair)}.section-top h1{font-size:36px}.module-card{border-top:3px solid #c46140}.module-card h3{font-size:23px}.module-card p{font-size:14px}.search{border-radius:5px;background:#fffaf5}.pill-button{border-radius:5px}.guide-cover{background:#f3d9c5;border-radius:9px;border-color:var(--hair);box-shadow:none}.guide-cover h1{font-size:clamp(34px,4vw,58px)}.guide-cover h1 em{color:#a83216}.guide-notebook{background:#203b3d;box-shadow:10px 12px 0 #d5bba4}.guide-chapter-card{border-radius:8px;border-color:var(--hair);background:#fffaf5}.guide-chapter-card h3{font-size:24px}.guide-chapter-nav{background:#f3decd;border-color:var(--hair);border-radius:7px}.guide-reading,.guide-note{background:#fffaf5;border-radius:8px}.guide-how>div{border-color:#c9b7a4}.guide-sticker{background:#edb994}.quiz-card{border-top:3px solid #b93417}.quiz-card h2{font-size:27px}.guide-reading-layout,.quiz-layout,.lesson-grid{gap:26px}.auth-shell{background:var(--canvas)}.auth-card{border-radius:12px;background:#fffaf5;box-shadow:none}.auth-card h1{font-weight:750;font-size:42px}.tag{border-radius:4px}.lesson-choice{border-radius:6px}.panel .btn{max-width:100%}
@media(max-width:1150px){.fraction-introduction{gap:30px}.fraction-equation{font-size:56px}.fraction-copy h3{font-size:28px}.fraction-copy p{font-size:16px}.visual-introduction.has-diagram{grid-template-columns:1fr}.intro-copy{grid-row:1}.intro-diagram{max-width:850px}.visual-subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-next{gap:28px}.visual-next-art{min-height:200px}.art-circle{width:155px;height:155px}.art-grid{width:115px;height:115px}.visual-record{gap:20px}}
@media(max-width:850px){.fraction-introduction{grid-template-columns:1fr}.fraction-picture{max-width:360px;margin:auto}.fraction-copy{max-width:620px}.fraction-copy h3{font-size:28px}.fraction-equation{font-size:58px}.intro-fraction-bar{margin:40px 0}.visual-next{grid-template-columns:1fr}.visual-next-art{display:none}.teaching-screen h2{font-size:36px}.module-tabs{gap:14px}.topbar{padding-left:26px;padding-right:26px}.sync-banner{margin:0 26px}main.main{padding:20px 26px 40px}}
@media(max-width:700px){.topbar{padding:12px 18px 5px;gap:8px}.topbar-title{font-size:12px;max-width:145px}.topbar-actions{gap:7px}.timer{padding:8px;font-size:11px}.topbar .btn{padding:8px 10px;font-size:11px}.back-to-lessons{font-size:12px}.sync-banner{margin:0 18px;font-size:10px;line-height:1.6}.mobile-menu{padding:6px;background:transparent;border-color:#cbbbaf}.close-menu{background:#ffffff22;color:white}main.main{padding:20px 18px 32px}.visual-welcome{padding:16px 0 26px}.visual-welcome h1{font-size:44px}.visual-welcome>p:last-child{font-size:15px}.visual-next{padding:26px 0}.visual-next-copy h2{font-size:30px}.visual-next-copy>p:not(.eyebrow){font-size:15px}.visual-subject-grid{gap:20px}.visual-subject strong{font-size:17px}.visual-subjects .section-head{align-items:center;gap:8px}.visual-subjects .section-head h2{font-size:21px}.visual-subjects .section-head .btn{font-size:11px;padding:8px 0}.visual-record{gap:20px}.visual-record>.btn{margin-left:0}.lesson-head h1{font-size:16px;line-height:1.4}.module-tabs{gap:12px;margin-bottom:22px}.module-tab{font-size:11px;min-height:44px;padding:9px 0}.teaching-position{font-size:10px;gap:8px}.teaching-screen h2{font-size:32px;margin:14px 0 26px}.fraction-picture{max-width:320px}.fraction-picture figcaption{font-size:18px}.fraction-picture-label{font-size:14px}.fraction-introduction{gap:28px}.fraction-copy h3{font-size:27px;margin-bottom:18px}.fraction-copy>.btn{margin-bottom:22px}.fraction-caption{font-size:17px!important}.fraction-equation{font-size:60px;margin:12px 0 20px;gap:17px}.fraction-copy p{font-size:16px}.fraction-copy .small{font-size:12px}.teaching-navigation{margin-top:14px}.teaching-navigation>.btn-primary{font-size:15px;min-width:135px}.teaching-side{grid-template-columns:1fr;gap:0}.lesson-extra{margin-top:20px}.intro-copy>.teaching-lead{font-size:19px}.intro-diagram .relationship-diagram{grid-template-columns:1fr}.intro-diagram .relation-spacer{display:none}.intro-diagram .relation-link span{transform:rotate(90deg)}.intro-diagram .fraction-strip{grid-template-columns:repeat(2,1fr)}.teaching-screen>.depth-prose,.teaching-screen>.teaching-lead{font-size:17px}.depth-example,.teaching-pause{padding:18px}.section-top h1{font-size:30px}.guide-cover{padding:25px}.guide-cover h1{font-size:38px}.quiz-card h2{font-size:24px}.beginner-glossary{grid-template-columns:1fr}.auth-card h1{font-size:34px}.intro-fraction-bar{height:110px;margin:40px 0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}button,.lesson-choice{transition:none}}