:root{color-scheme:light;--paper:#f5f7f1;--ink:#183d43;--muted:#536e70;--green:#17604e;--mint:#d5eee2;--line:#d7dfd6;--orange:#bc5b3d;--white:#fffefa;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--paper);color:var(--ink)}
*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.55}a{color:var(--green);text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #c87940;outline-offset:4px}[hidden]{display:none!important}h1,h2,h3,p{margin-top:0}h2{font-size:clamp(1.45rem,3vw,2rem);letter-spacing:-.04em;line-height:1.2}h3{font-size:1.1rem;line-height:1.4}p{line-height:1.65}button{touch-action:manipulation} .skip{position:fixed;top:8px;left:8px;background:white;padding:12px;z-index:100;transform:translateY(-150%)}.skip:focus{transform:none}
.math-header{max-width:1280px;margin:auto;padding:21px 32px;display:flex;align-items:center;gap:35px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:9px;align-items:center;text-decoration:none;font-weight:800;letter-spacing:-.04em;font-size:1.12rem;color:var(--ink)}.brand span{display:grid;place-items:center;width:34px;height:34px;background:var(--ink);color:#eff8e5;border-radius:11px;font-size:1.55rem}.math-header nav{display:flex;gap:25px;flex:1;flex-wrap:wrap}.math-header nav a{color:var(--muted);text-decoration:none;font-size:.85rem}.math-header nav a[aria-current]{color:var(--green);font-weight:750}.header__account{display:flex;gap:8px;flex-wrap:wrap;font-size:.8rem}.header__account a{padding:10px 13px;border:1px solid var(--line);border-radius:10px;text-decoration:none}.math-main{max-width:1216px;margin:auto;padding:0 32px 40px}.eyebrow{font-size:.7rem;font-weight:800;letter-spacing:.14em;color:var(--green);margin-bottom:15px}.math-hero{padding:62px 0 44px;display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:72px}.hero-copy h1{font-size:clamp(2.6rem,5.3vw,4.5rem);line-height:1.05;letter-spacing:-.065em;margin-bottom:25px}.hero-copy h1 em{font-style:normal;color:var(--green)}.hero-lead{max-width:490px;color:var(--muted);font-size:1rem}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.primary,.secondary,.text-button{min-height:46px;padding:12px 19px;border-radius:12px;border:1px solid transparent;font-weight:650;text-align:center}.primary{background:var(--green);color:#fff}.primary:hover{background:#0e493a;color:#fff}.secondary{background:var(--white);border-color:var(--line);color:var(--ink)}.secondary:hover{background:var(--mint);color:var(--ink)}.text-button{background:transparent;color:var(--green);padding-inline:8px}.text-button:hover{background:#e5eee2;color:#124b3c}.hero-note{margin-top:16px;font-size:.77rem;color:var(--muted)}.continue-link{display:block;margin-top:22px;font-size:.85rem;font-weight:700}
.math-notebook{position:relative;min-height:363px;padding:28px;background-color:var(--white);background-image:linear-gradient(#c6d8d529 1px,transparent 1px),linear-gradient(90deg,#c6d8d529 1px,transparent 1px);background-size:25px 25px;border:1px solid var(--line);border-radius:22px;transform:rotate(2deg);box-shadow:0 15px 0 -8px #dce6d9,0 25px 0 -16px #e2e7d9}.notebook-label{font-size:.7rem;font-weight:650;color:var(--muted)}.notebook-equation{font-size:clamp(2rem,4vw,3rem);font-weight:650;letter-spacing:-.04em;margin:25px 0}.notebook-equation strong{color:var(--green)}.fraction-strip{display:flex;height:29px;gap:4px}.fraction-strip i{flex:1;background:var(--mint);border:1px solid #8dbfa8}.fraction-strip i:nth-child(-n+2){background:#33876c}.fraction-strip i:nth-child(3){background:#e6aa62;border-color:#ce8a3a}.fraction-strip i:last-child{background:transparent;border:1px dashed #8da39a}.number-line{display:flex;justify-content:space-between;margin:27px 0 24px;border-top:2px solid #5a7b76}.number-line span{padding-top:12px;position:relative;font-size:.8rem}.number-line span:before{content:'';position:absolute;height:8px;width:2px;background:#5a7b76;top:-5px;left:50%}.notebook-note{padding:15px 18px;background:#eef4e8;border-radius:10px;max-width:330px}.notebook-note b{font-size:.81rem}.notebook-note p{font-size:.85rem;margin:7px 0}.notebook-note span{font-size:.69rem;color:var(--muted)}.notebook-stamp{position:absolute;right:-14px;bottom:10px;padding:12px 15px;background:#f4c38a;color:#734528;border-radius:50%;font-size:.7rem;font-weight:800;transform:rotate(-10deg)}
.math-dashboard{display:flex;align-items:center;justify-content:space-between;gap:25px;margin:10px 0 54px;padding:25px 28px;background:var(--ink);color:#fff;border-radius:20px}.math-dashboard .eyebrow{color:#a5dbbf;margin-bottom:8px}.math-dashboard h2{font-size:1.3rem;margin-bottom:8px}.math-dashboard p:last-child{color:#c4d5d1;font-size:.77rem;max-width:440px;margin:0}.math-metrics{display:flex;gap:25px;flex-shrink:0}.math-metrics>div,.math-metrics>button{display:grid;gap:5px;text-align:center;background:none;border:none;color:#fff;padding:5px;min-width:90px}.math-metrics strong{font-size:2rem;font-variant-numeric:tabular-nums}.math-metrics span{font-size:.66rem;color:#cfddd8}.math-metrics button:hover{background:#2c5153;border-radius:12px}
.section-heading{display:flex;gap:25px;align-items:end;justify-content:space-between;margin-bottom:24px}.section-heading h2{margin-bottom:12px}.section-heading p:last-child{font-size:.86rem;color:var(--muted);margin:0}.topic-search{font-size:.73rem;color:var(--muted);min-width:220px;display:grid;gap:7px}.topic-search input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--white);color:var(--ink)}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.topic-card{padding:22px;border:1px solid var(--line);background:var(--white);border-radius:17px;display:flex;flex-direction:column;min-width:0;position:relative}.topic-card[data-mastered=true]{border-color:#77b497;background:#f1f9ed}.topic-card:hover{box-shadow:0 5px 15px #183d4309;border-color:#9abaaa}.topic-card-top{display:flex;justify-content:space-between;gap:9px;color:var(--muted);font-size:.66rem;margin-bottom:17px}.topic-number{font-size:.74rem;font-weight:800;color:var(--green)}.topic-card h3{margin-bottom:10px}.topic-card p{font-size:.81rem;color:var(--muted);flex:1;margin-bottom:18px}.topic-card button{width:100%;margin-top:15px}.topic-card progress{width:100%;height:5px;appearance:none;display:block;border:none;border-radius:5px;overflow:hidden;background:#e1e9dc}.topic-card progress::-webkit-progress-bar{background:#e1e9dc}.topic-card progress::-webkit-progress-value{background:#3a8c68}.topic-card-status{font-size:.69rem;margin-top:7px;color:var(--muted)}.topic-section{scroll-margin-top:15px}
.workspace{margin:20px 0 38px;scroll-margin-top:15px}.workspace-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:25px}.workspace-heading>span{font-size:.78rem;color:var(--muted)}.workspace-grid{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:32px}.lesson-main>h2{font-size:clamp(1.8rem,4vw,2.7rem);margin-bottom:22px}.mode-tabs,.level-options{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:19px}.mode-tabs{padding:5px;background:#e6eee2;border-radius:13px;width:fit-content}.mode-tabs button,.level-options button{border:1px solid transparent;border-radius:10px;background:transparent;min-height:42px;padding:9px 13px;font-size:.78rem;color:var(--muted)}.mode-tabs button[aria-pressed=true]{background:var(--white);color:var(--green);box-shadow:0 3px 7px #183d4308;font-weight:750}.level-options button{border-color:var(--line);background:var(--white)}.level-options button[aria-pressed=true]{border-color:var(--green);color:var(--green);background:#e5f1e4}.lesson-content,.practice-card,.session-result{background:var(--white);padding:30px;border:1px solid var(--line);border-radius:20px;overflow-wrap:anywhere}.lesson-content p{font-size:.95rem;color:var(--muted)}.lesson-rule{background:var(--mint);border-radius:12px;padding:18px 20px;color:var(--ink)!important;font-weight:600}.lesson-content ol,.solution ol{padding-left:23px;line-height:1.8;font-size:.9rem}.lesson-content h3{margin-top:25px}.example-box{background:#f5f0e5;border:1px solid #e2d8be;padding:20px;border-radius:13px;margin:20px 0}.example-box strong{display:block;font-size:1.1rem}.example-box p{margin-bottom:0}.lesson-sidebar>div{padding:23px;background:#e6eee2;border-radius:18px;margin-bottom:15px}.lesson-sidebar .eyebrow{font-size:.6rem}.lesson-sidebar ol{padding-left:18px;font-size:.81rem;line-height:2}.lesson-sidebar .sidebar-note{background:transparent;border:1px solid var(--line)}.lesson-sidebar p{font-size:.8rem;color:var(--muted);margin-bottom:0}.lesson-sidebar>a{display:block;padding:12px;font-size:.8rem;line-height:1.65}
.practice-heading{display:flex;justify-content:space-between;gap:9px;font-size:.72rem;color:var(--muted);margin-bottom:12px}#session-progress{display:block;width:100%;height:5px;border:none;appearance:none;background:#e3eade;border-radius:3px;overflow:hidden}#session-progress::-webkit-progress-bar{background:#e3eade}#session-progress::-webkit-progress-value{background:var(--green)}.question-text{font-size:clamp(1.15rem,2.4vw,1.5rem);line-height:1.6;font-weight:650;margin:28px 0;white-space:pre-line}#answer-label{font-size:.78rem;display:block;margin-bottom:8px}#math-answer{background:var(--paper);border:1px solid #a5bcb4;border-radius:12px;padding:13px 16px;font-size:1.35rem;width:min(100%,350px);color:var(--ink)}.answer-format{font-size:.74rem;color:var(--muted);margin:9px 0 18px}.answer-actions{display:flex;gap:13px;flex-wrap:wrap;align-items:center}.answer-choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-bottom:15px}.answer-choices button{padding:15px;border:1px solid var(--line);border-radius:12px;background:var(--paper);text-align:left;overflow-wrap:anywhere}.answer-choices button[aria-pressed=true]{background:var(--mint);border-color:var(--green);font-weight:650}.hint-box{padding:16px;border-radius:12px;background:#f8eacb;font-size:.87rem;line-height:1.6;margin-top:20px}.answer-feedback{margin-top:18px;line-height:1.65;font-weight:650}.answer-feedback[data-kind=correct]{color:var(--green)}.answer-feedback[data-kind=wrong],.answer-feedback[data-kind=invalid]{color:#a2412b}.solution{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}.solution h3{font-size:.95rem}.solution p{color:var(--muted);font-size:.87rem}.next-button{margin-top:20px}.session-result h3{font-size:1.8rem;letter-spacing:-.04em}.result-mark{display:grid;place-items:center;background:var(--mint);font-size:2rem;color:var(--green);width:65px;height:65px;border-radius:50%;margin-bottom:22px}.result-stats{display:flex;gap:25px;padding:18px 0;margin-bottom:15px}.result-stats strong{font-size:1.6rem;display:block}.result-stats span{font-size:.72rem;color:var(--muted)}.curriculum-note{border-top:1px solid var(--line);padding-top:30px;margin-top:50px;max-width:850px}.curriculum-note h2{font-size:1.15rem}.curriculum-note p{font-size:.82rem;color:var(--muted)}.curriculum-note a{font-size:.82rem}.math-footer{border-top:1px solid var(--line);padding:25px 32px;display:flex;justify-content:space-between;gap:20px;max-width:1216px;margin:auto;font-size:.75rem;color:var(--muted)}#accountProgressStatus{font-size:.75rem!important;color:var(--muted)!important} .report-issue-launcher{z-index:20}
@media(max-width:1000px){.math-hero{gap:30px}.math-dashboard{align-items:start;flex-direction:column}.math-metrics{width:100%;justify-content:space-around}.workspace-grid{grid-template-columns:minmax(0,1fr) 230px;gap:20px}.math-header{gap:20px}.math-header nav{gap:13px}}
@media(max-width:760px){.math-header{padding:15px 20px;flex-wrap:wrap}.math-header nav{order:3;width:100%;flex-basis:100%;justify-content:space-between}.header__account{margin-left:auto}.math-main{padding:0 20px 30px}.math-hero{grid-template-columns:1fr;gap:28px;padding:40px 0 30px}.hero-copy h1{font-size:3.4rem}.math-notebook{min-height:310px;max-width:450px;width:100%;margin:0 auto;transform:rotate(1deg)}.math-dashboard{padding:22px;margin-bottom:35px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.section-heading{align-items:stretch;flex-direction:column;gap:17px}.workspace-grid{grid-template-columns:1fr}.lesson-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:10px}.lesson-sidebar>a{grid-column:1/-1}.workspace-heading{align-items:start}.math-footer{flex-wrap:wrap;padding-inline:20px}.lesson-content,.practice-card,.session-result{padding:23px}.notebook-stamp{right:0}}
@media(max-width:440px){.topic-grid{grid-template-columns:1fr}.hero-copy h1{font-size:2.9rem}.hero-copy .actions{align-items:stretch;flex-direction:column}.math-header nav{gap:8px}.math-header nav a{font-size:.77rem}.math-metrics{gap:7px}.math-metrics>div,.math-metrics>button{min-width:0;flex:1}.math-metrics strong{font-size:1.7rem}.math-metrics span{font-size:.63rem;line-height:1.5}.math-dashboard h2{font-size:1.2rem}.workspace-heading>span{max-width:50%;text-align:right}.mode-tabs{width:100%}.mode-tabs button{flex:1;font-size:.7rem;padding-inline:6px}.level-options button{font-size:.7rem;padding-inline:10px}.lesson-content,.practice-card,.session-result{padding:19px}.lesson-sidebar{grid-template-columns:1fr}.answer-choices{grid-template-columns:1fr}.math-notebook{padding:23px}.notebook-label{font-size:.66rem}.math-footer span{order:3;width:100%}.result-stats{gap:18px}.result-stats span{font-size:.65rem}}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}.primary,.secondary,.topic-card{transition:background .15s,border-color .15s,box-shadow .15s}}
.topic-progress{margin:0 0 20px;padding:15px 18px;border:1px solid var(--line);border-radius:12px;background:#edf3e9;font-size:.75rem}.topic-progress strong{font-size:.8rem}.topic-progress progress{display:block;width:100%;height:6px;margin:10px 0;accent-color:var(--green)}.topic-progress p{margin:0 0 7px;font-size:.75rem}.topic-progress span{color:var(--muted);line-height:1.5;display:block}
.skip{clip-path:inset(100%)}.skip:focus{clip-path:none}.header__account .header__account-link{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:10px 13px;background:var(--white);border:1px solid var(--line);border-radius:10px;color:var(--ink);text-decoration:none;line-height:1.3}.header__account .header__account-link:hover{background:var(--mint);color:var(--ink)}.answer-choices button[aria-pressed=true]:disabled{opacity:1}body .portal-report{background:#e6eee2;border-color:var(--line);color:var(--ink)}body .portal-report small{color:var(--muted)}body .portal-report a{background:var(--white);border-color:#a5bcb4;color:var(--ink)!important}body .portal-report a:hover{background:var(--mint);color:var(--ink)!important}
.lesson-mistake{padding:18px 22px;background:#faf0df;border-left:4px solid #bc7446;border-radius:12px;margin:24px 0}.lesson-mistake h3{margin-top:0}.lesson-mistake .mistake-wrong{font-weight:650;color:#8a412d}.lesson-check{padding:22px;background:#edf4e8;border:1px solid #bfd2bf;border-radius:14px;margin:24px 0}.lesson-check h3{margin-top:0}.lesson-check-choices{display:grid;gap:9px}.lesson-check button{text-align:left}.lesson-check button[data-correct=true]{opacity:1;background:#d5eee2}.lesson-check small{color:var(--muted);line-height:1.6;display:block}.lesson-check-feedback:empty{display:none}.lesson-check-feedback[data-kind=correct]{color:var(--green)}.lesson-check-feedback[data-kind=wrong]{color:#963d26}.order-panel{border:1px solid #b6cdbb;border-radius:14px;padding:20px;margin:20px 0;background:#edf4e8}.order-panel h3{margin:0 0 10px}.order-panel>p:not(.eyebrow){font-size:.83rem;line-height:1.6}.order-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:18px 0}.order-action{display:flex;align-items:center;gap:10px;padding:12px;border:1px solid #a8c0af;border-radius:10px;background:#fffefa;text-align:left;font-size:.82rem;line-height:1.5;min-height:52px}.order-action[aria-pressed=true]{background:#d5eee2;border-color:#17604e;opacity:1}.order-rank{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;flex-shrink:0;background:#edf3e9;font-weight:750}.warmup-note{padding:12px 15px;border-radius:10px;background:#edf4e8;font-size:.8rem;color:var(--muted)}@media(max-width:500px){.order-actions{grid-template-columns:1fr}.lesson-check,.lesson-mistake,.order-panel{padding:16px}}