/*! tailwindcss v4.2.1 | MIT License | https://tailwindcss.com */
@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, 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;--spacing:.25rem;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before{box-sizing:border-box;border:0 solid;margin:0;padding:0}::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,ui-sans-serif, system-ui, 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;-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{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]){-webkit-appearance:button;appearance:button}::file-selector-button{-webkit-appearance: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{.start{inset-inline-start:var(--spacing)}.end{inset-inline-end:var(--spacing)}}:root{--ink:#173036;--ink-2:#0f252a;--cream:#f5efe3;--paper:#fffdf7;--coral:#ff705b;--mint:#b9e5ca;--gold:#f0cf65;--line:#17303629}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--cream);color:var(--ink);margin:0;font-family:Arial,Helvetica,sans-serif}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit}.study-shell{min-height:100vh;overflow:hidden}.topbar{border-bottom:1px solid var(--line);grid-template-columns:1fr auto 1fr;align-items:center;width:min(1180px,100% - 40px);min-height:78px;margin:0 auto;display:grid}.brand{color:inherit;letter-spacing:-.02em;align-items:center;gap:11px;font-weight:800;text-decoration:none;display:flex}.brand-mark{background:var(--ink);width:36px;height:36px;color:var(--cream);letter-spacing:-.06em;border-radius:50%;place-items:center;font-size:12px;display:grid}nav{gap:28px;height:78px;display:flex}.nav-link{color:#17303694;cursor:pointer;background:0 0;border:0;place-items:center;font-size:13px;font-weight:700;text-decoration:none;display:grid;position:relative}.nav-link.active{color:var(--ink)}.nav-link.active:after{content:"";background:var(--coral);border-radius:3px 3px 0 0;height:3px;position:absolute;bottom:-1px;left:0;right:0}.share-button{border:1px solid var(--line);color:var(--ink);cursor:pointer;background:0 0;border-radius:3px;justify-self:end;padding:10px 13px;font-size:11px;font-weight:800}.hero{grid-template-columns:minmax(0,1fr) 320px;align-items:end;gap:clamp(48px,8vw,110px);width:min(1180px,100% - 40px);margin:0 auto;padding:clamp(52px,8vw,92px) 0 58px;display:grid}.eyebrow,.section-kicker{color:#527075;letter-spacing:.14em;text-transform:uppercase;margin:0 0 16px;font-size:11px;font-weight:900}h1{letter-spacing:-.075em;max-width:780px;margin:0;font:800 clamp(50px,7.1vw,96px)/.92 Arial,sans-serif}h1 em{color:var(--coral);font:400 1em Georgia,serif}.hero-lede{color:#527075;max-width:640px;margin:27px 0 30px;font-size:clamp(16px,2vw,19px);line-height:1.55}.hero-actions{flex-wrap:wrap;gap:11px;display:flex}.hero-primary,.hero-secondary{cursor:pointer;border-radius:3px;padding:14px 18px;font-weight:800}.hero-primary{background:var(--ink);color:var(--cream);border:0}.hero-primary span{padding-left:16px}.hero-secondary{border:1px solid var(--line);color:var(--ink);background:0 0}.hero-secondary.dark{color:var(--cream);border-color:#f6f0e442}.memory-note{background:var(--mint);min-height:225px;padding:34px;position:relative;transform:rotate(1.4deg);box-shadow:0 18px 34px #17303617}.note-number{opacity:.5;font:700 12px/1 monospace;position:absolute;top:23px;right:25px}.note-label{letter-spacing:.12em;text-transform:uppercase;margin:0 0 34px;font-size:11px;font-weight:900}.memory-note p:not(.note-label):not(.note-tip){letter-spacing:-.03em;margin:0;font:24px/1.18 Georgia,serif}.note-tip{border-top:1px solid #17303633;margin:24px 0 0;padding-top:15px;font-size:12px;font-weight:700;line-height:1.4}.stats-strip{border-top:1px solid var(--line);grid-template-columns:140px 140px 160px 1fr;align-items:center;gap:24px;width:min(1180px,100% - 40px);margin:0 auto 58px;padding:21px 0;display:grid}.stats-strip div{align-items:baseline;gap:9px;display:flex}.stats-strip strong{color:var(--coral);font:700 27px/1 Georgia,serif}.stats-strip span,.stats-strip p{text-transform:uppercase;letter-spacing:.06em;font-size:11px;font-weight:800;line-height:1.35}.stats-strip p{color:#6c8084;text-transform:none;letter-spacing:0;justify-self:end;max-width:270px;margin:0;font-weight:600}.practice-section{background:var(--ink);color:var(--cream);padding:64px max(20px,50% - 590px) 82px}.mode-heading{justify-content:space-between;align-items:end;margin-bottom:28px;display:flex}.mode-heading h2,.ratio-lab h2,.statement-map h2{letter-spacing:-.045em;margin:0;font:700 clamp(38px,5vw,62px)/.98 Georgia,serif}.practice-section .section-kicker{color:var(--mint)}.mode-switch{border:1px solid #f6f0e42e;border-radius:4px;gap:4px;padding:4px;display:flex}.mode-switch button{color:#f6f0e499;cursor:pointer;background:0 0;border:0;border-radius:2px;padding:9px 15px;font-size:12px;font-weight:800}.mode-switch button.selected{background:var(--cream);color:var(--ink)}.topic-pills{flex-wrap:wrap;gap:7px;margin:0 0 21px;display:flex}.topic-pills button{color:#f6f0e4a8;cursor:pointer;background:0 0;border:1px solid #f6f0e433;border-radius:99px;padding:8px 13px;font-size:11px;font-weight:800}.topic-pills button.selected{border-color:var(--mint);background:var(--mint);color:var(--ink)}.practice-grid{grid-template-columns:minmax(0,1fr) 285px;gap:58px;display:grid}.card-meta{color:#f6f0e494;letter-spacing:.11em;text-transform:uppercase;justify-content:space-between;margin-bottom:13px;font-size:11px;font-weight:800;display:flex}.flashcard{background:var(--paper);width:100%;min-height:375px;color:var(--ink);text-align:left;box-shadow:12px 12px 0 var(--coral);cursor:pointer;border:0;border-radius:3px;flex-direction:column;justify-content:space-between;padding:clamp(31px,5vw,58px);transition:transform .2s,box-shadow .2s;display:flex}.flashcard:hover{box-shadow:15px 15px 0 var(--coral);transform:translate(-3px,-3px)}.flashcard:focus-visible{outline:4px solid var(--mint);outline-offset:6px}.flashcard.is-flipped{background:var(--mint);box-shadow:12px 12px 0 var(--gold)}.card-kicker{letter-spacing:.13em;text-transform:uppercase;font-size:11px;font-weight:900}.card-question{letter-spacing:-.045em;max-width:760px;font:700 clamp(29px,4vw,50px)/1.08 Georgia,serif}.card-answer{letter-spacing:-.025em;max-width:790px;font:700 clamp(20px,2.6vw,31px)/1.3 Georgia,serif}.flip-cue{align-self:flex-end;font-size:13px;font-weight:800}.flip-cue b{background:var(--coral);color:#fff;border-radius:50%;place-items:center;width:31px;height:31px;margin-left:8px;display:inline-grid}.answer-footer{justify-content:space-between;align-items:end;gap:20px;display:flex}.formula{border:1px solid #17303638;border-radius:4px;padding:10px 13px;font:700 12px/1.35 monospace}.memory-line{text-align:right;max-width:310px;font-size:12px;font-weight:800;line-height:1.4}.card-actions{justify-content:space-between;gap:10px;margin-top:27px;display:flex}.rating-actions{gap:9px;display:flex}.ghost-button,.primary-button,.again-button{cursor:pointer;border-radius:3px;padding:13px 18px;font-weight:800}.ghost-button{color:var(--cream);background:0 0;border:1px solid #f6f0e433}.primary-button{background:var(--mint);color:var(--ink);border:0}.again-button{color:#ff9d8f;background:0 0;border:1px solid #ff705ba6}.rail-title{color:#f6f0e494;letter-spacing:.12em;text-transform:uppercase;border-bottom:1px solid #f6f0e433;margin:27px 0 10px;padding-bottom:12px;font-size:11px;font-weight:800}.topic-row{width:100%;color:var(--cream);text-align:left;opacity:.48;cursor:pointer;background:0 0;border:0;border-bottom:1px solid #f6f0e417;grid-template-columns:31px 1fr;align-items:start;gap:10px;padding:13px 4px;display:grid}.topic-row.current,.topic-row:hover{opacity:1}.topic-row>span:first-child{color:var(--coral);font:12px/1 monospace}.topic-row strong,.topic-row small{display:block}.topic-row strong{font:19px/1.1 Georgia,serif}.topic-row small{color:#f6f0e494;margin-top:4px;font-size:10px}.quiz-tease{border:1px solid #f6f0e433;margin-top:24px;padding:20px}.quiz-tease p{opacity:.55;text-transform:uppercase;letter-spacing:.08em;margin:0 0 4px;font-size:10px}.quiz-tease strong{font:20px/1.2 Georgia,serif;display:block}.quiz-tease button{color:var(--mint);cursor:pointer;background:0 0;border:0;margin-top:17px;padding:0;font-size:12px;font-weight:800}.quiz-layout{max-width:900px;margin:10px auto 0}.quiz-progress{background:#f6f0e421;border-radius:99px;height:5px;margin-bottom:26px;overflow:hidden}.quiz-progress span{background:var(--coral);height:100%;transition:width .25s;display:block}.quiz-meta{color:#f6f0e494;letter-spacing:.09em;text-transform:uppercase;justify-content:space-between;font-size:11px;font-weight:800;display:flex}.quiz-meta span{color:var(--mint)}.quiz-question{letter-spacing:-.035em;max-width:850px;margin:31px 0 34px;font:700 clamp(29px,4.4vw,49px)/1.08 Georgia,serif}.choice-list{grid-template-columns:1fr 1fr;gap:11px;display:grid}.choice-list button{min-height:78px;color:var(--cream);text-align:left;cursor:pointer;background:#ffffff09;border:1px solid #f6f0e438;border-radius:3px;grid-template-columns:34px 1fr auto;align-items:center;gap:13px;padding:16px 19px;display:grid}.choice-list button:hover:not(:disabled){border-color:var(--mint);background:#b9e5ca14}.choice-list button>span{border:1px solid #f6f0e440;border-radius:50%;place-items:center;width:28px;height:28px;font:700 11px/1 monospace;display:grid}.choice-list button strong{font-size:14px;line-height:1.35}.choice-list button b{color:inherit;text-transform:uppercase;letter-spacing:.07em;font-size:10px}.choice-list button.correct{border-color:var(--mint);background:var(--mint);color:var(--ink)}.choice-list button.incorrect{border-color:var(--coral);background:#ff705b2b}.choice-list button.dimmed{opacity:.42}.feedback{border-left:4px solid var(--coral);background:#fff1;justify-content:space-between;align-items:center;gap:25px;margin-top:17px;padding:20px;display:flex}.feedback.correct{border-color:var(--mint)}.feedback strong{font:20px/1.2 Georgia,serif}.feedback p{color:#f6f0e4b8;max-width:640px;margin:6px 0 0;font-size:13px;line-height:1.45}.feedback button{background:var(--cream);color:var(--ink);cursor:pointer;border:0;border-radius:3px;flex:none;padding:12px 16px;font-weight:800}.quiz-summary{text-align:center;border:1px solid #f6f0e433;max-width:740px;margin:28px auto 0;padding:clamp(30px,6vw,64px)}.score-number{color:var(--mint);font:700 clamp(74px,14vw,140px)/.8 Georgia,serif;display:block}.score-number span{color:#f6f0e452;font-size:.36em}.quiz-summary h3{margin:35px 0 10px;font:700 31px/1.1 Georgia,serif}.quiz-summary>p:not(.section-kicker){color:#f6f0e4ad;max-width:540px;margin:0 auto;line-height:1.5}.summary-actions{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:25px;display:flex}.ratio-lab{grid-template-columns:.78fr 1.22fr;gap:clamp(45px,8vw,110px);width:min(1180px,100% - 40px);margin:0 auto;padding:clamp(70px,9vw,120px) 0;display:grid}.lab-intro>p:not(.section-kicker){color:#587378;max-width:410px;margin:25px 0;font-size:17px;line-height:1.6}.memory-rule{border:1px solid var(--line);border-radius:3px;align-items:center;gap:11px;width:fit-content;padding:13px 16px;font:800 12px/1.2 monospace;display:flex}.memory-rule span{background:#fff;padding:6px 8px}.memory-rule b{color:var(--coral)}.lab-panel{background:var(--paper);padding:clamp(25px,4vw,44px);box-shadow:0 24px 60px #1730361a}.timeline{grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;display:grid}.timeline div{border:1px solid var(--line);flex-direction:column;justify-content:center;min-height:110px;padding:17px;display:flex}.timeline small,.timeline span{color:#6c8084;text-transform:uppercase;letter-spacing:.05em;font-size:10px;font-weight:800}.timeline strong{margin:7px 0 3px;font:700 28px/1 Georgia,serif}.timeline i{width:108px;color:var(--coral);text-align:center;font-size:11px;font-weight:800;line-height:1.35}.basis-toggle{border:1px solid var(--line);grid-template-columns:1fr 1fr;margin:24px 0 17px;display:grid}.basis-toggle button{color:#637a7f;cursor:pointer;background:0 0;border:0;padding:11px;font-size:11px;font-weight:800}.basis-toggle button+button{border-left:1px solid var(--line)}.basis-toggle button.selected{background:var(--ink);color:var(--cream)}.calculation{grid-template-columns:65px 1fr;align-content:center;gap:12px 16px;min-height:189px;padding:24px;display:grid}.calculation.good{background:var(--mint)}.calculation.warning{background:#f7dccd}.calculation>span{color:#526d72;text-transform:uppercase;letter-spacing:.07em;font-size:10px;font-weight:900}.calculation p{margin:0;font:19px/1.3 Georgia,serif}.calculation em{border-top:1px solid #1730362b;grid-column:1/-1;margin-top:4px;padding-top:14px;font-size:11px;font-style:normal;font-weight:700;line-height:1.45}.lab-footnote{color:#587378;margin:17px 0 0;font-size:12px;line-height:1.5}.statement-map{background:#eadfce;padding:75px max(20px,50% - 590px) 90px}.map-heading{max-width:680px;margin-bottom:38px}.statement-cards{grid-template-columns:repeat(3,1fr);gap:14px;display:grid}.statement-cards article{background:var(--paper);flex-direction:column;min-height:295px;padding:27px;display:flex}.statement-cards article>span{color:var(--coral);font:700 11px/1 monospace}.statement-cards h3{margin:36px 0 10px;font:700 28px/1 Georgia,serif}.statement-cards p{color:#667d81;min-height:46px;margin:0 0 24px;font-size:13px;line-height:1.45}.statement-cards strong{background:var(--cream);min-height:58px;padding:14px;font:700 14px/1.4 monospace}.statement-cards small{color:#6b7e82;margin-top:auto;padding-top:22px;font-size:11px;line-height:1.5}footer{grid-template-columns:1fr auto 1fr;align-items:center;gap:20px;width:min(1180px,100% - 40px);min-height:100px;margin:0 auto;display:grid}footer p{color:#698085;font-size:11px}footer button{color:var(--ink);cursor:pointer;background:0 0;border:0;justify-self:end;font-size:11px;font-weight:800}@media (max-width:860px){.topbar{grid-template-columns:1fr auto}nav{display:none}.hero,.ratio-lab{grid-template-columns:1fr}.memory-note{width:min(100%,430px)}.stats-strip{grid-template-columns:repeat(3,1fr)}.stats-strip p{grid-column:1/-1;justify-self:start}.practice-grid{grid-template-columns:1fr}.topic-rail{display:none}.statement-cards{grid-template-columns:1fr}.statement-cards article{min-height:240px}}@media (max-width:610px){.topbar,.hero,.stats-strip,.ratio-lab,footer{width:min(100% - 28px,1180px)}.share-button{padding-inline:10px;font-size:9px}.hero{padding-top:48px}.hero-actions>button{width:100%}.stats-strip{grid-template-columns:1fr;gap:14px}.stats-strip div{border-bottom:1px solid var(--line);justify-content:space-between;padding-bottom:11px}.mode-heading{align-items:center}.mode-heading h2{font-size:38px}.mode-switch button{padding-inline:10px}.flashcard{min-height:430px;box-shadow:8px 8px 0 var(--coral);padding:27px 23px}.answer-footer{flex-direction:column;align-items:stretch}.memory-line{text-align:left;max-width:none}.card-actions{flex-direction:column}.card-actions>button,.rating-actions,.rating-actions button{flex:1}.rating-actions{display:flex}.choice-list{grid-template-columns:1fr}.feedback{flex-direction:column;align-items:stretch}.timeline{grid-template-columns:1fr}.timeline i{width:auto}.basis-toggle{grid-template-columns:1fr}.basis-toggle button+button{border-left:0;border-top:1px solid var(--line)}.calculation{grid-template-columns:1fr}.calculation em{grid-column:1}footer{grid-template-columns:1fr;padding:28px 0}footer button{justify-self:start}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
