:root{font-synthesis:none;text-rendering:optimizelegibility;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button{font:inherit}#root{min-height:100vh}.app{color:#172033;background:radial-gradient(circle at 0 0,#e8f2ff 0,#0000 35%),radial-gradient(circle at 100% 100%,#f3e8ff 0,#0000 35%),#f8fafc;min-height:100vh;padding:64px 8%}.hero{max-width:760px;margin-bottom:48px}.eyebrow{letter-spacing:.2em;color:#667085;margin:0 0 8px;font-size:14px;font-weight:700}.hero h1{letter-spacing:-.05em;margin:0;font-size:clamp(52px,8vw,88px);line-height:.9}.hero h1 span{letter-spacing:-.02em;margin-top:16px;font-size:.42em;display:block}.intro{color:#667085;margin-top:28px;font-size:20px}.learning-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;display:grid}.learning-card{text-align:left;min-height:240px;color:inherit;cursor:pointer;background:#ffffffd9;border:1px solid #e2e8f0;border-radius:24px;padding:28px;transition:transform .18s,box-shadow .18s;box-shadow:0 12px 35px #0f172a0f}.learning-card:hover{transform:translateY(-5px);box-shadow:0 18px 45px #0f172a1f}.learning-icon{margin-bottom:32px;font-size:42px;display:block}.learning-card h2{margin:0 0 10px;font-size:26px}.learning-card p{color:#667085;margin:0;font-size:15px;line-height:1.6}.lesson-page{padding-top:40px}.back-button{color:#526075;cursor:pointer;background:0 0;border:0;min-height:44px;padding:8px 0;font-weight:700}.back-button:hover{color:#172033}.lesson-header{max-width:700px;margin:28px 0 40px}.lesson-header h1,.summary-card h1{letter-spacing:-.05em;margin:0;font-size:clamp(44px,6vw,68px)}.activity-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;max-width:1120px;display:grid}.activity-card{color:#172033;text-align:left;cursor:pointer;background:#ffffffe6;border:1px solid #e2e8f0;border-radius:24px;min-height:280px;padding:30px;transition:transform .18s,box-shadow .18s;box-shadow:0 12px 35px #0f172a0f}.activity-card:hover{transform:translateY(-4px);box-shadow:0 18px 45px #0f172a1f}.activity-icon{color:#5872b8;letter-spacing:.04em;margin-bottom:42px;font-size:30px;font-weight:800;display:block}.activity-card h2{margin:0 0 10px;font-size:26px}.activity-card p{color:#667085;margin:0;line-height:1.6}.start-label{color:#425b9a;margin-top:28px;font-weight:700;display:block}.practice-header{text-align:center;max-width:780px;margin:40px auto 20px}.practice-guidance{color:#46546b;margin:0;font-size:clamp(22px,3vw,28px);font-weight:650;line-height:1.35}.question-card,.summary-card{text-align:center;background:#ffffffe6;border:1px solid #e2e8f0;border-radius:30px;max-width:740px;margin:0 auto;padding:clamp(28px,5vw,54px);box-shadow:0 16px 45px #0f172a12}.equation{letter-spacing:-.06em;margin:0;font-size:clamp(52px,9vw,86px);line-height:1}.visual-groups{justify-content:center;align-items:center;gap:24px;min-height:116px;margin:36px 0 22px;display:flex}.visual-groups.reinforce{outline-offset:14px;border-radius:16px;outline:3px solid #dbe7ff}.quantity{flex-wrap:wrap;justify-content:center;gap:10px;max-width:250px;display:flex}.counter{border-radius:50%;width:34px;height:34px;box-shadow:inset 0 -3px #00000014}.quantity-blue .counter{background:#8eb7ee}.quantity-lavender .counter{background:#b8a7e8}.visual-plus{color:#667085;font-size:34px}.answer-message{color:#667085;min-height:28px;margin:24px 0 16px;font-size:17px}.answer-message.correct{color:#32755a;font-weight:700}.answer-message.retry{color:#6b5b31}.answer-choices{grid-template-columns:repeat(3,1fr);gap:14px;display:grid}.answer-choice{color:#172033;cursor:pointer;background:#fff;border:2px solid #dae2ef;border-radius:18px;min-height:82px;font-size:32px;font-weight:750}.answer-choice:hover:not(:disabled){background:#f5f8ff;border-color:#8ea9dc}.answer-choice.is-correct{color:#276547;background:#edf8f2;border-color:#75b59b}.answer-choice.is-incorrect{color:#765820;background:#fffaf0;border-color:#d6b576}.answer-choice:disabled{cursor:default}.summary-card{margin-top:40px}.summary-card .intro{margin:18px 0 38px}.summary-grid{grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:36px;display:grid}.summary-grid div{background:#f6f8fc;border-radius:18px;min-height:130px;padding:20px 12px}.summary-grid strong{font-size:38px;display:block}.summary-grid span{color:#667085;margin-top:8px;font-size:14px;line-height:1.35;display:block}.primary-button{color:#fff;cursor:pointer;background:#425b9a;border:0;border-radius:16px;min-height:58px;padding:0 26px;font-weight:700}.primary-button:hover{background:#354d88}.reading-activity-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.story-activity-card{background:linear-gradient(145deg,#fffdf8,#f6f1ff);min-height:300px}.story-setup-card,.story-reader-card{background:#fffefaf0;border:1px solid #e5ddce;border-radius:30px;max-width:720px;margin:38px auto;padding:clamp(30px,6vw,58px);box-shadow:0 18px 48px #3f342217}.story-setup-card h1,.story-header h1{letter-spacing:-.045em;margin:0;font-size:clamp(38px,6vw,62px);line-height:1.04}.story-setup-card>p:not(.eyebrow):not(.form-message){color:#596477;margin:18px 0 32px;font-size:18px;line-height:1.55}.story-setup-card label{color:#25304a;margin:20px 0 8px;font-weight:750;display:block}.story-setup-card input{color:#172033;width:100%;min-height:58px;font:inherit;background:#fff;border:2px solid #dbe1ed;border-radius:14px;outline:none;padding:0 18px;font-size:19px}.story-setup-card input:focus{border-color:#8098cd;box-shadow:0 0 0 4px #e9efff}.form-message{color:#765820;min-height:24px;margin:14px 0;font-weight:650}.story-start-button{width:100%;margin-top:4px;font-size:18px}.story-header{text-align:center;max-width:720px;margin:30px auto 18px}.story-reader-card{margin-top:0}.story-copy{max-width:570px;margin:0 auto}.story-copy p{color:#273147;margin:0 0 21px;font-family:Georgia,Times New Roman,serif;font-size:clamp(23px,3.5vw,30px);line-height:1.48}.story-copy p:last-child{margin-bottom:0}.story-question{border-top:1px solid #e8e0d3;margin-top:38px;padding-top:30px}.story-question h2{margin:0;font-size:clamp(22px,3.5vw,29px);line-height:1.3}.story-feedback{color:#667085;min-height:26px;margin:15px 0;font-weight:700}.story-feedback.correct{color:#32755a}.story-feedback.retry{color:#6b5b31}.story-answer-choices{gap:12px;display:grid}.story-answer-choices button{color:#172033;text-align:left;cursor:pointer;background:#fff;border:2px solid #dae2ef;border-radius:16px;width:100%;min-height:62px;padding:12px 18px;font-size:18px;font-weight:700}.story-answer-choices button:hover:not(:disabled){background:#f5f8ff;border-color:#8ea9dc}.story-answer-choices button.is-correct{color:#276547;background:#edf8f2;border-color:#75b59b}.story-answer-choices button:disabled{cursor:default}.story-continue-button{min-width:185px;margin:38px auto 0;font-size:18px;display:block}.story-completion h1{font-size:clamp(35px,5vw,56px);line-height:1.05}@media (width<=900px){.learning-grid{grid-template-columns:repeat(2,1fr)}.activity-grid{grid-template-columns:1fr;max-width:620px}.reading-activity-grid{max-width:420px}}@media (width<=520px){.app{padding:40px 24px}.learning-grid,.answer-choices,.summary-grid{grid-template-columns:1fr}.summary-grid div{min-height:auto}.visual-groups{gap:16px}.counter{width:28px;height:28px}}.addition-path{gap:14px;max-width:880px;display:grid}.path-section-wrap{position:relative}.path-section-wrap.ends-section{margin-bottom:38px}.path-section{letter-spacing:.13em;text-transform:uppercase;color:#526075;margin:0 0 14px;font-size:15px}.path-section:first-child{margin-top:0}.path-section.number-relationships{color:#69449d}.path-section.mental-math{color:#9a650f}.path-section.subtraction-foundations{color:#287456}.path-section.problem-solving{color:#425b9a}.path-step{background:#ffffffd6;border:2px solid #e2e8f0;border-radius:24px;grid-template-columns:64px 1fr auto;align-items:center;gap:20px;min-height:132px;padding:22px 26px;display:grid;position:relative;box-shadow:0 8px 26px #0f172a0a}.path-marker{color:#526075;border:2px solid #aeb9c9;border-radius:50%;place-items:center;width:48px;height:48px;font-size:21px;font-weight:800;display:grid}.path-label{letter-spacing:.13em;color:#667085;margin:0 0 5px;font-size:12px;font-weight:800}.path-copy h2{margin:0 0 4px;font-size:25px}.path-copy>p:last-child{color:#667085;margin:0}.path-action{color:#fff;cursor:pointer;background:#425b9a;border:0;border-radius:14px;min-width:120px;min-height:50px;padding:0 18px;font-weight:750}.path-action:disabled{color:#7a8798;cursor:not-allowed;background:#e8edf4}.path-connector{z-index:2;filter:drop-shadow(0 2px 2px #3646611a);justify-items:center;width:16px;height:30px;display:grid;position:absolute;bottom:-22px;left:43px}.connector-line{background:linear-gradient(#c7d1df,#94a7bd);border-radius:3px;width:3px;height:20px;display:block}.connector-arrow{border-bottom:3px solid #8195ad;border-right:3px solid #8195ad;width:11px;height:11px;margin-top:-3px;display:block;transform:rotate(45deg)}.path-connector.is-section-connector{background:linear-gradient(#faf8ff,#f1ecfa);border:1px solid #d9cfe9;border-radius:999px;width:34px;height:50px;padding-top:6px;bottom:-37px;left:34px}.path-connector.is-section-connector .connector-line{background:linear-gradient(#c9b8e3,#9875c9);height:28px}.path-connector.is-section-connector .connector-arrow{border-color:#805aad}.path-step.is-complete{background:#f5fbf7;border-color:#b7dbc9}.path-step.is-complete .path-marker{color:#276547;background:#e5f5ec;border-color:#75b59b}.path-step.is-complete .path-action{color:#276547;background:#edf6f1}.path-step.is-current{background:#f5f8ff;border-color:#718ad0;box-shadow:0 14px 35px #425b9a21}.path-step.is-current .path-marker{color:#425b9a;border-color:#5872b8}.path-step.is-current .path-label{color:#425b9a}.path-step.is-upcoming{opacity:.72}.path-practice-addition.is-current{background:#f1fbfb;border-color:#389c9d}.path-practice-addition.is-current .path-marker,.path-practice-addition.is-current .path-label{color:#176b6e;border-color:#238184}.path-practice-addition.is-current .path-action{background:#237d80}.path-addition-check.is-current{background:#fffaf0;border-color:#d59b38}.path-addition-check.is-current .path-marker,.path-addition-check.is-current .path-label{color:#8d5d10;border-color:#b97815}.path-addition-check.is-current .path-action{background:#a96e14}.path-learn-bonds.is-current{background:#f8f4ff;border-color:#9875c9}.path-learn-bonds.is-current .path-marker,.path-learn-bonds.is-current .path-label{color:#62408e;border-color:#7652aa}.path-learn-bonds.is-current .path-action,.path-practice-bonds.is-current .path-action{background:#69449d}.path-practice-bonds.is-current{background:#f6f1fc;border-color:#7b5aae}.path-practice-bonds.is-current .path-marker,.path-practice-bonds.is-current .path-label{color:#593784;border-color:#69449d}.visual-equals{color:#526075;white-space:nowrap;font-size:25px;font-weight:750}.lesson-sentence{color:#46546b;max-width:600px;margin:0 auto 20px;font-size:clamp(20px,2.7vw,25px);font-weight:600;line-height:1.45}.bond-diagram{width:220px;height:150px;margin:0 auto 12px;position:relative}.bond-whole,.bond-part{border-radius:50%;place-items:center;width:58px;height:58px;font-size:26px;font-weight:800;display:grid;position:absolute}.bond-whole{color:#563480;background:#eee5fb;top:0;left:81px}.bond-part{color:#563480;background:#f4effb;border:2px solid #c7addf;bottom:0}.bond-part-left{left:16px}.bond-part-right{right:16px}.bond-line{transform-origin:0;background:#a984c5;width:74px;height:2px;position:absolute;top:65px}.bond-line-left{left:105px;transform:rotate(138deg)}.bond-line-right{left:114px;transform:rotate(42deg)}.quiet-button{color:#526075;cursor:pointer;background:0 0;border:0;margin:16px auto 0;padding:8px;font-weight:700;display:block}.ten-frame{background:#fff9e9;border:3px solid #b98529;border-radius:16px;grid-template-columns:repeat(5,48px);gap:8px;width:max-content;margin:0 auto 28px;padding:12px;display:grid}.ten-counter,.ten-space{border-radius:50%;width:48px;height:48px}.ten-counter{background:#e3a52d;box-shadow:inset 0 -4px #6f480829}.ten-space{background:#fffdf6;border:2px dashed #d9c08c}.equality-bars{color:#667085;justify-content:center;align-items:center;gap:20px;margin:28px 0 0;font-weight:700;display:flex}.equality-bars strong{color:#69449d;font-size:34px}.truth-choices{grid-template-columns:1fr 1fr;gap:14px;display:grid}.truth-choices button{color:#352353;cursor:pointer;background:#fff;border:2px solid #d5c7e8;border-radius:18px;min-height:74px;font-size:24px;font-weight:800}.truth-choices button:hover:not(:disabled){background:#f8f4ff;border-color:#8d6fc0}.truth-choices .is-correct{color:#276547;background:#edf8f2;border-color:#75b59b}.truth-choices .is-incorrect{color:#765820;background:#fffaf0;border-color:#d6b576}@media (width<=900px){.addition-path{max-width:620px}}@media (width<=520px){.path-step{grid-template-columns:48px 1fr;gap:14px;padding:20px}.path-action{grid-column:2;width:100%}.path-connector{left:32px}.path-connector.is-section-connector{left:23px}.path-copy h2{font-size:22px}.ten-frame{grid-template-columns:repeat(5,38px);gap:6px}.ten-counter,.ten-space{width:38px;height:38px}.truth-choices{grid-template-columns:1fr}}