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var(--tw-shadow)}}:root{--hero:#e11d2e;--hero-deep:#b80e1e;--hero-soft:#fde8eb;--ink:#0e1330;--ink-soft:#1f2754;--cream:#f7f4ee;--paper:#fff;--canvas:#f3f6fa;--canvas-deep:#e9eef5;--learning:#3157f6;--learning-deep:#2544c4;--blue-soft:#e9eeff;--success:#16845b;--success-soft:#e5f5ef;--warning:#b16b13;--danger:#c43b32;--danger-soft:#fff0ed;--coin:#d99a2b;--coin-soft:#fff4d6;--muted:#68758a;--line:#dce3ec;--line-strong:#cbd5e1;--shadow-small:0 1px 2px #1420330d, 0 8px 24px #1420330d;--shadow-large:0 24px 70px #14203324}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--canvas);min-width:320px;color:var(--ink);font-family:var(--font-body), "Atkinson Hyperlegible", Arial, sans-serif}body{background:var(--paper);min-height:100vh;margin:0;overflow-x:hidden}button,input,select,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{color:inherit}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:var(--font-display), 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#e11d2e29}.button:hover{background:var(--hero-deep);border-color:var(--hero-deep);transform:translateY(-1px)}.button:disabled{opacity:.58;cursor:not-allowed;transform:none}.button-secondary{color:var(--ink);border-color:var(--line-strong);box-shadow:none;background:#fff}.button-secondary:hover{background:var(--canvas);border-color:var(--ink)}.button-small{min-height:40px;padding-inline:15px}.text-link{color:var(--learning);align-items:center;gap:6px;font-weight:700;display:inline-flex}.brand-lockup{font:700 1.45rem/1 var(--font-display), sans-serif;letter-spacing:-.045em;align-items:center;gap:10px;display:inline-flex}.brand-lockup img{display:block}.brand-lockup b{color:var(--hero);font-weight:inherit}.marketing-header{z-index:20;border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:24px;height:78px;display:flex;position:relative}.marketing-nav,.header-actions{align-items:center;gap:27px;display:flex}.marketing-nav{color:var(--muted);font-size:.95rem}.marketing-nav a:hover{color:var(--ink)}.header-actions{gap:12px}.header-login{font-weight:700}.hero{grid-template-columns:minmax(0,1.05fr) minmax(410px,.85fr);align-items:center;gap:clamp(48px,7vw,94px);padding:82px 0 66px;display:grid;position:relative}.hero:after{content:"";background:var(--line);width:42vw;height:1px;position:absolute;bottom:28px;right:-12vw}.hero-copy h1{max-width:720px;margin-bottom:25px;font-size:clamp(3.7rem,6.4vw,5.6rem);line-height:.93}.hero-copy>p:not(.eyebrow){max-width:640px;color:var(--muted);margin-bottom:0;font-size:1.25rem;line-height:1.53}.hero-actions{align-items:center;gap:15px;margin:34px 0 28px;display:flex}.hero-actions 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25px}.diagnostic-progress span{background:var(--learning);height:100%;transition:width .24s;display:block}.diagnostic-question{background:var(--canvas);border-left:3px solid var(--learning);padding:21px}.diagnostic-question p{margin-bottom:20px}.equation{font:600 1.55rem/1.35 var(--font-data), monospace;letter-spacing:-.045em}.solution-preview{padding:22px 0 15px 24px;position:relative}.solution-preview:before{content:"";background:var(--line);width:2px;position:absolute;top:30px;bottom:29px;left:7px}.solution-step{grid-template-columns:16px 1fr;gap:14px;margin-bottom:14px;display:grid;position:relative}.solution-node{z-index:1;border:2px solid var(--line-strong);background:#fff;border-radius:50%;width:15px;height:15px;margin-left:-24px;position:relative}.solution-step.is-done .solution-node{background:var(--success);border-color:var(--success)}.solution-step.is-active .solution-node{border-color:var(--learning);box-shadow:0 0 0 3px var(--blue-soft)}.solution-step code,.solution-step small{display:block}.solution-step code{font:600 .9rem var(--font-data), monospace}.solution-step small{color:var(--muted);margin-top:3px}.diagnostic-input{border:1px dashed var(--line-strong);width:100%;min-height:46px;color:var(--ink);background:#fff;border-radius:0;margin-top:3px;padding:0 13px}.diagnostic-feedback{background:var(--success-soft);color:var(--success);align-items:center;margin:2px 0 14px;padding:11px 12px;font-size:.86rem}.diagnostic-submit{width:100%}.proof-strip{grid-template-columns:repeat(4,1fr);padding:0 0 48px;display:grid}.proof-strip div{border-top:1px solid var(--line);border-right:1px solid var(--line);padding:20px}.proof-strip div:first-child{border-left:1px solid var(--line)}.proof-strip strong,.proof-strip span{display:block}.proof-strip strong{font:700 1.85rem var(--font-display), sans-serif}.proof-strip span{color:var(--muted);margin-top:4px}.section{padding:96px 0}.section-canvas{background:var(--canvas)}.section-ink{background:var(--ink);color:#fff}.section-heading{max-width:720px;margin-bottom:48px}.section-heading h2{margin-bottom:16px;font-size:clamp(2.6rem,5vw,4.35rem);line-height:.98}.section-heading p{color:var(--muted);font-size:1.1rem;line-height:1.6}.section-ink .section-heading p{color:#ffffff94}.process-grid{border-top:1px solid var(--line);border-left:1px solid var(--line);grid-template-columns:repeat(3,1fr);display:grid}.process-card{border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;min-height:280px;padding:28px}.process-card span{color:var(--learning);font:600 .78rem var(--font-data), monospace}.process-card h3{margin:50px 0 12px;font-size:1.75rem}.process-card p{color:var(--muted);margin-bottom:0;line-height:1.55}.partial-points{grid-template-columns:minmax(0,.85fr) minmax(460px,1.15fr);align-items:center;gap:clamp(40px,8vw,110px);display:grid}.partial-copy h2{margin-bottom:20px;font-size:clamp(2.7rem,5vw,4.7rem);line-height:.96}.partial-copy p{color:#ffffff9e;font-size:1.1rem;line-height:1.6}.rubric{background:#ffffff0f;border:1px solid #ffffff1f;padding:8px 26px}.rubric-row{border-bottom:1px solid #ffffff17;grid-template-columns:28px 1fr auto;align-items:center;gap:14px;min-height:66px;display:grid}.rubric-row:last-child{border:0}.rubric-row i{background:var(--success);color:#fff;border-radius:50%;place-items:center;width:21px;height:21px;font-size:.72rem;font-style:normal;display:grid}.rubric-row span{color:#ffffffbf}.rubric-row b{color:#fff;font:600 .78rem var(--font-data), monospace}.mode-grid,.parent-grid{grid-template-columns:1fr 1fr;gap:20px;display:grid}.mode-card,.parent-panel,.price-card{border:1px solid var(--line);box-shadow:var(--shadow-small);background:#fff;padding:34px}.mode-card h3{margin:20px 0 12px;font-size:2rem}.mode-card p,.parent-panel p{color:var(--muted);line-height:1.6}.mode-card ul,.parent-panel ul{color:var(--ink-soft);margin:22px 0 0;padding-left:19px;line-height:1.8}.parent-grid{align-items:stretch}.parent-panel h2{font-size:3rem;line-height:.98}.parent-steps{background:var(--ink);color:#fff;gap:0;display:grid}.parent-step{border-bottom:1px solid #ffffff1a;min-height:100px;padding:25px 28px 25px 76px;position:relative}.parent-step:last-child{border:0}.parent-step b{color:var(--hero);font:600 .78rem var(--font-data), monospace;position:absolute;top:24px;left:27px}.parent-step strong,.parent-step small{display:block}.parent-step small{color:#ffffff85;margin-top:5px}.price-wrap{grid-template-columns:1fr minmax(360px,.7fr);align-items:center;gap:40px;display:grid}.price-copy h2{margin-bottom:16px;font-size:clamp(2.8rem,5vw,4.4rem);line-height:.98}.price-copy p{max-width:630px;color:var(--muted);font-size:1.08rem;line-height:1.6}.price-card{border-top:4px solid var(--hero)}.price-card>span{color:var(--muted)}.price-card strong{font:700 3.7rem/1 var(--font-display), 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.eyebrow{color:#ffffff6e}.auth-brand-panel>small{color:#ffffff73;font:600 .72rem var(--font-data), monospace;letter-spacing:.06em;text-transform:uppercase}.auth-rail{justify-content:space-between;width:min(380px,100%);height:52px;margin-top:40px;display:flex;position:relative}.auth-rail:before{content:"";background:var(--learning);height:3px;position:absolute;top:16px;left:0;right:0}.auth-rail i{z-index:1;border:9px solid var(--ink);background:var(--learning);width:34px;height:34px;box-shadow:0 0 0 2px var(--learning);border-radius:50%;position:relative}.auth-card-wrap{align-content:center;min-height:100vh;padding:36px clamp(24px,6vw,90px);display:grid}.auth-back{color:var(--muted);font-weight:700;position:absolute;top:32px}.auth-card{border:1px solid var(--line);width:min(480px,100%);box-shadow:var(--shadow-large);background:#fff;margin-inline:auto;padding:clamp(28px,5vw,48px)}.auth-card h1{margin-bottom:11px;font-size:clamp(2.4rem,5vw,3.5rem);line-height:.98}.auth-card>p{color:var(--muted);margin-bottom:28px;line-height:1.5}.google-button{border:1px solid var(--line-strong);cursor:pointer;background:#fff;justify-content:center;align-items:center;gap:12px;width:100%;min-height:48px;font-weight:700;display:flex}.google-button:hover{background:var(--canvas)}.google-button span{color:#4285f4;border-radius:50%;place-items:center;width:23px;height:23px;font:700 1rem Arial,sans-serif;display:grid}.auth-separator{color:var(--muted);align-items:center;gap:12px;margin:25px 0;font-size:.8rem;display:flex}.auth-separator:before,.auth-separator:after{content:"";background:var(--line);flex:1;height:1px}.auth-form{gap:18px;display:grid}.form-field{gap:7px;font-weight:700;display:grid}.form-field input,.form-field select,.form-field textarea{border:1px solid var(--line-strong);background:#fff;border-radius:4px;width:100%;min-height:48px;padding:10px 12px}.form-field textarea{resize:vertical;min-height:120px}.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--learning);outline:3px solid var(--blue-soft)}.form-field input[aria-invalid=true]{border-color:var(--danger)}.form-field small{color:var(--muted);font-weight:400}.form-field .field-error,.form-error{color:var(--danger)}.form-success{color:var(--success)}.form-error,.form-success{background:var(--danger-soft);margin:0;padding:11px 12px;line-height:1.4}.form-success{background:var(--success-soft)}.auth-submit{width:100%}.auth-minor-link{color:var(--learning);justify-self:center;font-size:.88rem;font-weight:700}.auth-alternate{border-top:1px solid var(--line);color:var(--muted);text-align:center;margin-top:28px;padding-top:21px}.auth-alternate a{color:var(--learning);font-weight:700}.confirmation-box{background:var(--blue-soft);border-left:3px solid var(--learning);gap:10px;margin-bottom:22px;padding:20px;display:grid}.confirmation-box 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