@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.absolute{position:absolute}.fixed{position:fixed}.static{position:static}.block{display:block}.grid{display:grid}.table{display:table}.lowercase{text-transform:lowercase}}:root{--ink:#20251f;--muted:#6a7065;--paper:#f8f9f5;--lime:#d9f67b;--line:#e0e4d9;color:var(--ink);background:var(--paper);font-synthesis:none;font-family:Segoe UI,Arial,sans-serif}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,select{cursor:pointer}button,input,select{border-radius:10px;min-height:46px}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible{outline-offset:5px;outline:3px solid #527420}button:disabled,input:disabled{cursor:default}.site-header{border-bottom:1px solid var(--line)}.header-inner{justify-content:space-between;align-items:center;gap:24px;max-width:1160px;margin:auto;padding:23px 32px;display:flex}.brand{letter-spacing:-1.6px;align-items:center;gap:10px;font-size:31px;font-weight:780;display:inline-flex}.brand img{width:38px;height:38px}.brand-dot{color:#789936}.site-header nav{align-items:center;gap:28px;font-size:13px;font-weight:600;display:flex}.site-header nav a{min-height:44px;color:var(--muted);align-items:center;gap:12px;display:flex}.site-header nav a.active{color:var(--ink)}.release-label{color:#626957;align-items:center;gap:7px;font-size:11px;display:flex}.release-label>span,.status-dot{background:#7c9c3f;border-radius:50%;flex-shrink:0;width:6px;height:6px}.home-main,.lab-main{max-width:1160px;margin:auto;padding:0 32px}.hero{grid-template-columns:1.15fr 1fr;align-items:center;gap:60px;padding:66px 0 70px;display:grid}.eyebrow{letter-spacing:1.5px;color:#656e59;font-size:10px;font-weight:700;display:inline-block}.small-cross{vertical-align:middle;color:#3b4d26;margin-right:7px;font-size:18px}h1{letter-spacing:-2.7px;margin:24px 0;font-size:clamp(36px,4.7vw,58px);font-weight:650;line-height:1.12}.highlight{z-index:0;white-space:nowrap;position:relative}.highlight:after{content:"";z-index:-1;background:var(--lime);height:15px;position:absolute;bottom:3px;left:-2px;right:-5px;transform:rotate(-2deg)}.hero-copy>p{color:var(--muted);margin-bottom:25px;font-size:15px;line-height:1.9}.primary{background:var(--ink);color:#fff;border:0;border-radius:10px;justify-content:space-between;align-items:center;gap:32px;min-height:52px;padding:16px 22px;font-size:13px;font-weight:600;transition:background .15s;display:flex}.primary:hover{background:#3c4831}.primary>span{font-size:20px;line-height:1}.hero-cta{width:fit-content}.hero-note{color:#787e70;margin-top:15px;font-size:11px;display:block}.hero-visual{background:var(--lime);aspect-ratio:1.04;border-radius:18px;position:relative;overflow:hidden}.visual-top,.visual-bottom{z-index:1;letter-spacing:1.2px;justify-content:space-between;align-items:center;font-size:8px;font-weight:650;display:flex;position:absolute;left:26px;right:26px}.visual-top{top:22px}.visual-top>span:last-child{font-size:20px}.visual-bottom{font-size:7px;bottom:23px}.hero-graph{width:92%;position:absolute;top:12%;left:4%}.formula-sticker{background:#fff;border-radius:12px;padding:18px 23px;font-family:Georgia,serif;font-size:31px;font-style:italic;position:absolute;top:19%;left:7%;transform:rotate(-7deg);box-shadow:0 8px 16px #4c602017}.formula-sticker>span{letter-spacing:.2px;color:var(--muted);margin-top:5px;font-family:Segoe UI,sans-serif;font-size:8px;font-style:normal;display:block}.aha-sticker{background:var(--ink);color:var(--lime);letter-spacing:-1.8px;border-radius:12px;padding:8px 19px 12px;font-size:34px;font-weight:650;position:absolute;bottom:22%;right:8%;transform:rotate(8deg)}.aha-sticker>span{margin-left:14px;font-size:28px}.section-heading{justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px;display:flex}.section-heading h2,.approach h2{letter-spacing:-.9px;margin-top:10px;font-size:27px;font-weight:600;line-height:1.3}.section-note{color:var(--muted);padding-bottom:4px;font-size:11px}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.topic-card{border:1px solid var(--line);background:#fff;border-radius:14px;flex-direction:column;padding:23px;transition:border-color .15s,transform .15s;display:flex}.topic-card:hover{border-color:#9cac83;transform:translateY(-3px)}.topic-top{color:#707965;letter-spacing:1px;justify-content:space-between;font-size:9px;display:flex}.topic-top>span:first-child{font-variant-numeric:tabular-nums;font-size:12px}.topic-art{letter-spacing:-1px;align-items:center;height:80px;font-family:Georgia,serif;font-size:32px;font-style:italic;display:flex}.art-G02{color:#7d983e;font-size:55px;font-style:normal}.art-G08{color:#53694b}.topic-card h3{letter-spacing:-.4px;margin:2px 0 10px;font-size:18px;font-weight:650}.topic-card p{color:var(--muted);max-width:250px;margin:0 0 23px;font-size:12px;line-height:1.8}.topic-bottom{color:#727a67;border-top:1px solid #edf0e7;justify-content:space-between;align-items:center;margin-top:auto;padding-top:16px;font-size:10px;display:flex}.circle-arrow{width:30px;height:30px;color:var(--ink);background:#f0f3e9;border-radius:50%;place-items:center;font-size:18px;display:grid}.approach{border-top:1px solid var(--line);border-bottom:1px solid var(--line);grid-template-columns:1fr 1.2fr;align-items:center;gap:60px;margin-top:58px;padding:35px 0;display:grid}.approach-steps{gap:18px;display:grid}.approach-steps>div{align-items:baseline;gap:18px;font-size:12px;line-height:1.8;display:flex}.approach-steps>div>span{color:#7c9250;font-size:10px}.approach-steps p{color:var(--muted);margin:0}.approach-steps strong{color:var(--ink);font-weight:600}.preview-note{color:#747c6b;align-items:baseline;gap:10px;max-width:750px;padding:22px 0;font-size:10px;line-height:1.8;display:flex}.site-footer{border-top:1px solid var(--line);max-width:1160px;color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:20px;margin:30px auto 0;padding:26px 32px;font-size:12px;line-height:1.7;display:flex}.footer-brand{flex-wrap:wrap;align-items:baseline;display:flex}.footer-credit{white-space:nowrap;font-size:11px}.footer-credit a{color:inherit;text-underline-offset:3px;text-decoration:underline}.learning-main{max-width:820px;min-height:65vh}.learning-main h1{letter-spacing:-1.5px;margin:22px 0 14px;font-size:clamp(30px,6vw,44px)}.learning-main p{line-height:1.7}.learning-save{color:var(--muted);font-size:12px}.learning-inputs{border:0;gap:12px;margin:16px 0 24px;padding:0;display:grid}.learning-inputs label{gap:7px;font-size:15px;display:grid}.learning-inputs input[type=text]{border:1px solid var(--line);background:#fff;border-radius:10px;width:100%;padding:12px;font-size:20px}.learning-inputs .learning-choice{border:1px solid var(--line);cursor:pointer;border-radius:12px;align-items:center;gap:12px;min-height:48px;padding:14px;line-height:1.5;display:flex}.learning-choice.selected{background:#eef7d7;border-color:#748945}.learning-actions{flex-wrap:wrap;align-items:center;gap:16px;display:flex}.learning-question .feedback{margin-bottom:20px}.learning-sections{gap:12px;margin-top:28px;display:grid}.learning-sections article{border:1px solid var(--line);border-radius:12px;padding:16px}.learning-sections h2{margin:0;font-size:18px}.learning-sections p{font-size:13px}.learning-progress-bar{background:#e5e8df;border-radius:8px;width:100%;height:14px;margin-top:16px;display:flex;overflow:hidden}.learning-progress-bar>span{display:block}.stage-practiced{background:#cfaa63}.stage-independent{background:#a2bd56}.stage-confirmed{background:#405c32}.learning-progress-legend{color:#49513f;flex-wrap:wrap;gap:8px 20px;margin:12px 0 0;padding:0;font-size:13px;list-style:none;display:flex}.learning-progress-legend li{align-items:center;gap:7px;display:flex}.learning-progress-legend li>span{border-radius:3px;flex-shrink:0;width:10px;height:10px}.account-continue{margin:18px 0}.site-footer strong{color:var(--ink);letter-spacing:-.6px;margin-right:12px;font-size:16px}.practice-main{max-width:720px;margin:auto;padding:32px}.back-link{min-height:44px;color:var(--muted);align-items:center;font-size:12px;display:inline-flex}.practice-heading{margin:25px 0}.practice-heading h1{letter-spacing:-1.3px;margin:12px 0;font-size:36px}.practice-heading p{color:var(--muted);font-size:13px;line-height:1.7}.level-picker{flex-wrap:wrap;align-items:center;gap:14px;margin:26px 0;font-size:12px;display:flex}.level-picker>div{gap:5px;display:flex}.level-picker button{border:1px solid var(--line);color:#656c5c;background:#fff;width:44px;height:44px}.level-picker button[aria-pressed=true]{background:var(--lime);color:var(--ink);border-color:#c6de80;font-weight:700}.level-note{color:#767d6d;flex:1;min-width:135px;font-size:10px}.round-progress{color:#6c7560;justify-content:space-between;gap:12px;margin-bottom:10px;font-size:10px;display:flex}.progress-track{background:#e5eadb;border-radius:6px;height:4px;margin-bottom:24px;overflow:hidden}.progress-track>span{background:#91b24c;height:100%;transition:width .2s;display:block}.exercise{border:1px solid var(--line);background:#fff;border-radius:16px;min-width:0;padding:30px}.exercise-meta{justify-content:space-between;align-items:center;gap:12px;display:flex}.badge{white-space:nowrap;background:#f2f5e9;border-radius:24px;padding:6px 10px;font-size:10px}.exercise h2{letter-spacing:-.5px;margin:26px 0 24px;font-size:22px;font-weight:600;line-height:1.4}.formula{text-align:center;background:#f7f9f1;border-radius:12px;margin-bottom:28px;padding:28px 14px;font-family:Georgia,serif;font-size:36px}.points{background:#f7f9f1;border-radius:12px;flex-wrap:wrap;gap:24px;margin:24px 0;padding:20px;font-family:Georgia,serif;font-size:28px;display:flex}.answer-label{font-size:12px;font-weight:600}.number-answer{border:1px solid #c4ceba;width:100%;margin:9px 0 6px;padding:14px 16px;font-size:18px;display:block}.number-answer:disabled{color:#59634d;background:#f6f8f1}.hint{color:#737a69;margin-top:10px;font-size:11px;font-weight:400;line-height:1.7;display:block}.exercise .primary,.round-result .primary{width:100%;margin-top:22px}.graph-options{grid-template-columns:1fr 1fr;gap:12px;display:grid}.graph-option{cursor:pointer;border:2px solid #e5e9df;border-radius:12px;overflow:hidden}.graph-option.selected{background:#f4f9e9;border-color:#5d7838}.option-label{align-items:center;gap:8px;padding:0 12px;font-size:11px;display:flex}input[type=radio]{accent-color:#5d7838}.graph-option svg{width:100%;display:block}.feedback{background:#fff6e5;border-radius:10px;margin-top:20px;padding:16px;font-size:13px;line-height:1.7}.feedback.correct{background:#edf7d9}.feedback strong{font-weight:550}.text-button{color:#64734e;background:0 0;border:0;justify-content:space-between;align-items:center;gap:20px;min-height:44px;margin-top:12px;padding:0;font-size:12px;display:flex}.skip{margin:12px auto 0}.explanation{background:#f7f9f3;border-radius:8px;padding:14px;font-size:13px;line-height:1.9}.practice-tip{color:#7a826e;justify-content:center;align-items:center;gap:10px;padding:22px 0 0;font-size:11px;display:flex}.practice-tip>span{color:#859f4d;font-size:19px}.round-result{border:1px solid var(--line);text-align:center;background:#fff;border-radius:16px;padding:32px}.result-mark{color:#8eaa4d;margin:5px 0 15px;font-size:50px;display:block}.round-result h2{letter-spacing:-.8px;margin:16px 0;font-size:25px;font-weight:600}.result-number{letter-spacing:-3px;font-size:68px;font-weight:650}.result-number span{color:#b1bba2;font-size:36px}.round-result>p:not(.result-number){color:var(--muted);font-size:13px}.round-result .text-button{justify-content:center}.lab-main{padding-top:25px}.workspace{grid-template-columns:260px minmax(0,1fr);align-items:start;gap:24px;display:grid}.controls{background:#edf1e3;border-radius:16px;padding:24px}.controls h2{margin:0 0 24px;font-size:16px;font-weight:650}.controls label{margin-bottom:18px;font-size:12px;font-weight:600;display:block}.controls input,.controls select{border:1px solid var(--line);background:#fff;width:100%;margin-top:8px;padding:10px;font-size:12px;display:block}.secondary{background:0 0;border:1px solid #9daa88;width:100%;font-size:13px;font-weight:600}details{border-top:1px solid var(--line);color:var(--muted);margin-top:14px;font-size:11px}summary{cursor:pointer;align-items:center;min-height:44px;display:flex}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:11px}@media(max-width:900px){.hero{gap:28px}.hero h1{font-size:44px}.topic-card{padding:19px}.topic-card h3{font-size:16px}.formula-sticker{padding:15px 18px;font-size:25px}.aha-sticker{font-size:28px}}@media(max-width:640px){.header-inner{gap:14px;padding:16px 20px}.brand{font-size:28px}.brand img{width:34px;height:34px}.site-header nav{gap:18px;font-size:12px}.release-label{display:none}.home-main,.lab-main{padding-left:20px;padding-right:20px}.hero{grid-template-columns:1fr;gap:30px;padding:40px 0}.hero h1{letter-spacing:-1.8px;font-size:clamp(36px,10vw,48px)}.hero-copy>p{font-size:14px}.hero-visual{aspect-ratio:1.25;width:100%;max-width:430px}.hero-graph{top:7%}.visual-bottom{bottom:17px}.topic-grid{grid-template-columns:1fr;gap:12px}.section-heading h2{font-size:25px}.section-note{display:none}.topic-card{padding:22px}.topic-art{height:67px}.topic-card h3{font-size:20px}.topic-card p{max-width:290px;font-size:13px}.approach{grid-template-columns:1fr;gap:26px;margin-top:36px;padding:30px 0}.approach h2{font-size:26px}.site-footer{margin-top:12px;padding:22px 20px}.practice-main{padding:20px 16px}.practice-heading h1{font-size:30px}.exercise{padding:22px 18px}.exercise h2{font-size:21px}.formula{font-size:32px}.workspace{grid-template-columns:1fr}.level-note{flex-basis:100%;margin-top:-5px}.graph-options{gap:8px}.option-label{padding:0 7px}}@media(max-width:480px){.graph-options{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important}}.bank-main{max-width:900px;margin:auto;padding:40px 22px}.bank-main h1{letter-spacing:-1.5px;margin:15px 0;font-size:clamp(32px,6vw,52px)}.bank-main>p,.bank-sources p{line-height:1.7}.bank-main h2{margin-top:40px;font-size:25px}.bank-controls{flex-wrap:wrap;align-items:center;gap:16px;padding:20px 0;display:flex}.bank-controls button,.bank-controls select,.account-form input,.account-form button{background:#fff;border:1px solid #a9b39b;border-radius:8px;max-width:100%;min-height:44px;padding:10px}.bank-controls select{width:100%;display:block}.bank-meta{color:#606a57;font-size:13px}.bank-search{display:block}.bank-search input{border:1px solid #a9b39b;border-radius:8px;width:min(100%,440px);min-height:44px;margin-top:8px;padding:10px;display:block}@media print{.bank-search{display:none}}.study-question{border:1px solid var(--line);break-inside:avoid;background:#fff;border-radius:14px;margin:16px 0;padding:24px}.study-question h3{font-size:18px;font-weight:500;line-height:1.65}.study-question details{color:#303e25;font-size:15px;line-height:1.6}.study-graph{width:100%;max-width:410px;display:block}.account-form{gap:18px;max-width:440px;margin-top:25px;display:grid}.account-form label,.account-form input{width:100%;display:block}.account-form input{margin-top:8px}.account-form .primary{color:#fff;background:#22271f;border-color:#22271f;justify-content:center;font-size:16px}.account-form .primary:hover{background:#3c4831}.account-form button:disabled{opacity:.65}.account-form .account-link{color:#495a35;text-align:left;text-underline-offset:4px;cursor:pointer;background:0 0;border:0;border-radius:0;justify-self:start;min-height:44px;margin:0;padding:8px 0;font-size:14px;text-decoration:underline}.account-form .account-link:hover{color:#22271f}.account-form .account-link:focus-visible{outline-offset:4px;border-radius:3px;outline:2px solid #495a35}.account-main .account-intro{max-width:60ch;line-height:1.6}.account-main 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