*,:before,:after{--tw-border-spacing-x: 0;--tw-border-spacing-y: 0;--tw-translate-x: 0;--tw-translate-y: 0;--tw-rotate: 0;--tw-skew-x: 0;--tw-skew-y: 0;--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-color: rgb(59 130 246 / .5);--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }::backdrop{--tw-border-spacing-x: 0;--tw-border-spacing-y: 0;--tw-translate-x: 0;--tw-translate-y: 0;--tw-rotate: 0;--tw-skew-x: 0;--tw-skew-y: 0;--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-color: rgb(59 130 246 / .5);--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }*,:before,:after{box-sizing:border-box;border-width:0;border-style:solid;border-color:#e5e7eb}:before,:after{--tw-content: ""}html,:host{line-height:1.5;-webkit-text-size-adjust:100%;-moz-tab-size:4;-o-tab-size:4;tab-size:4;font-family:ui-sans-serif,system-ui,sans-serif,"Apple Color Emoji","Segoe UI Emoji",Segoe UI Symbol,"Noto Color Emoji";font-feature-settings:normal;font-variation-settings:normal;-webkit-tap-highlight-color:transparent}body{margin:0;line-height:inherit}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;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-feature-settings:normal;font-variation-settings:normal;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}button,input,optgroup,select,textarea{font-family:inherit;font-feature-settings:inherit;font-variation-settings:inherit;font-size:100%;font-weight:inherit;line-height:inherit;letter-spacing:inherit;color:inherit;margin:0;padding:0}button,select{text-transform:none}button,input:where([type=button]),input:where([type=reset]),input:where([type=submit]){-webkit-appearance:button;background-color:transparent;background-image:none}:-moz-focusring{outline:auto}:-moz-ui-invalid{box-shadow:none}progress{vertical-align:baseline}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}summary{display:list-item}blockquote,dl,dd,h1,h2,h3,h4,h5,h6,hr,figure,p,pre{margin:0}fieldset{margin:0;padding:0}legend{padding:0}ol,ul,menu{list-style:none;margin:0;padding:0}dialog{padding:0}textarea{resize:vertical}input::-moz-placeholder,textarea::-moz-placeholder{opacity:1;color:#9ca3af}input::placeholder,textarea::placeholder{opacity:1;color:#9ca3af}button,[role=button]{cursor:pointer}:disabled{cursor:default}img,svg,video,canvas,audio,iframe,embed,object{display:block;vertical-align:middle}img,video{max-width:100%;height:auto}[hidden]:where(:not([hidden=until-found])){display:none}.\!container{width:100%!important}.container{width:100%}@media (min-width: 640px){.\!container{max-width:640px!important}.container{max-width:640px}}@media (min-width: 768px){.\!container{max-width:768px!important}.container{max-width:768px}}@media (min-width: 1024px){.\!container{max-width:1024px!important}.container{max-width:1024px}}@media (min-width: 1280px){.\!container{max-width:1280px!important}.container{max-width:1280px}}@media (min-width: 1536px){.\!container{max-width:1536px!important}.container{max-width:1536px}}.visible{visibility:visible}.static{position:static}.fixed{position:fixed}.relative{position:relative}.block{display:block}.flex{display:flex}.inline-flex{display:inline-flex}.table{display:table}.grid{display:grid}.hidden{display:none}.justify-self-start{justify-self:start}.justify-self-end{justify-self:end}.justify-self-center{justify-self:center}.border{border-width:1px}.underline{text-decoration-line:underline}.filter{filter:var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow)}:root{--bg: 255 255 255;--fg: 17 24 39}@media (prefers-color-scheme: dark){:root{--bg: 17 24 39;--fg: 229 231 235}}html,body,#root{height:100%}body{background-color:rgb(var(--bg));color:rgb(var(--fg))}:root{--sat-fg: #111827;--sat-bg: #ffffff;--sat-blue: #2563eb;--sat-gray: #d1d5db;--sat-gray-200: #e5e7eb;--sat-header-footer-bg: #E6EDF8;--sat-ui-font: ui-sans-serif, system-ui, -apple-system, Helvetica, Arial;--sat-serif-font: Georgia, "Times New Roman", serif;--sat-qnum-size: clamp(12px, 1.1vw, 14px);--sat-question-size: clamp(16px, 1.25vw, 18px);--sat-choice-size: clamp(14px, 1.1vw, 16px);--sat-header-height: 9vh;--sat-footer-height: 8.5vh;--sat-side-margin: clamp(12px, 2.9vw, 42px);--verbal-divider-width: 6px}.sat-page{color:var(--sat-fg);background:var(--sat-bg);min-height:100vh}.sat-header{position:fixed;left:0;right:0;top:0;height:var(--sat-header-height);background:var(--sat-header-footer-bg);z-index:30}.sat-header:after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background-image:repeating-linear-gradient(90deg,#000 0,#000 12px,#0000 12px,#0000 20px)}.sat-header-inner{height:100%;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 24px}.sat-timer{display:grid;grid-template-rows:auto auto;row-gap:6px;justify-items:center}.sat-footer{position:fixed;left:0;right:0;bottom:0;height:var(--sat-footer-height);background:var(--sat-header-footer-bg);z-index:100;pointer-events:auto}.sat-footer *{pointer-events:auto}.sat-footer:before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background-image:repeating-linear-gradient(90deg,#000 0,#000 12px,#0000 12px,#0000 20px)}.sat-footer-inner{height:100%;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 24px}.sat-container{max-width:1440px;margin:0 auto;padding:calc(var(--sat-header-height) + 12px) var(--sat-side-margin) calc(var(--sat-footer-height) + 16px)}.sat-topbar{display:grid;grid-template-columns:auto 1fr;align-items:center;margin:6px 0 8px;position:relative}.sat-qnum{display:inline-grid;place-items:center;min-width:32px;height:28px;padding:0 10px;border-radius:6px;background:#000;color:#fff;font:600 var(--sat-qnum-size) var(--sat-ui-font)}.sat-qbar{height:28px;background:var(--sat-gray-200)}.sat-qbar:after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;background-image:repeating-linear-gradient(90deg,#000 0,#000 12px,#0000 12px,#0000 20px)}.sat-center-divider{position:fixed;top:var(--sat-header-height);bottom:var(--sat-footer-height);left:50%;width:var(--verbal-divider-width);transform:translate(-50%);background:#9ca3af;pointer-events:none;z-index:15}.sat-choices{display:grid;row-gap:40px}.sat-choice{position:relative}.sat-choice input[type=radio]{position:absolute;opacity:0;top:0;right:0;bottom:0;left:0}.sat-choice label{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid #000;color:var(--sat-fg);border-radius:8px;padding:12px 14px;font:400 var(--sat-choice-size) var(--sat-ui-font);cursor:pointer}.sat-key{width:28px;height:28px;display:inline-grid;place-items:center;border:1px solid var(--sat-gray);border-radius:999px;background:#fff;font-weight:600}.sat-choice input[type=radio]:checked+label{background:#fff;border-color:var(--sat-blue);border-width:3px;box-shadow:0 0 0 2px #fff,0 0 0 3px #9ca3af}.sat-input{font-size:clamp(24px,2.8vw,36px);padding:10px .5ch;border:1px solid #000;border-radius:8px;width:clamp(220px,24vw,360px);aspect-ratio:2/1;background-image:linear-gradient(#000,#000);background-repeat:no-repeat;background-size:calc(100% * 11 / 13) 2px;background-position:center calc(100% - 6px)}.sat-answer-preview{margin-top:12px;font-weight:600;font-size:clamp(18px,2vw,24px);display:flex;align-items:center;gap:8px}@media (max-width: 1000px){.sat-two-col{display:block}}.verbal-grid{display:grid;grid-template-columns:minmax(0,1fr) var(--verbal-divider-width) minmax(0,1fr);gap:0;align-items:stretch;min-height:60vh}.verbal-left{background:#fdf8e7;padding:16px;overflow:auto}.verbal-divider{background:#9ca3af;position:relative}.verbal-right{background:#fff;padding:16px;overflow:auto}.calc-modal{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:1000}.calc-modal[aria-hidden=false]{display:block}.calc-modal-dialog{position:fixed;left:0;top:var(--sat-header-height);margin:0;width:25vw;height:66.666vh;z-index:1001;pointer-events:auto;background:#fff;border:1px solid #d1d5db;border-radius:10px;display:flex;flex-direction:column;overflow:hidden}.calc-modal-body{flex:1;display:flex;flex-direction:column;min-height:0}.calc-toolbar{display:flex;align-items:center;justify-content:space-between;padding:6px 10px;background:#000;color:#fff}.calc-toggle{display:inline-flex;gap:0;border:1px solid #111827;border-radius:8px;overflow:hidden}.calc-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;padding:8px 12px;font-weight:700;cursor:pointer;background:#111827;color:#fff;font-family:var(--sat-ui-font)}.calc-btn+.calc-btn{border-left:1px solid #111827}.calc-btn.active{background:#fff;color:#111827;text-decoration:underline}.calc-btn:hover{background:#2563eb;color:#fff}.calc-tools{display:inline-flex;gap:8px}.calc-icon-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:3px solid #ffffff;background:transparent;color:#fff;width:32px;height:32px;border-radius:10px;cursor:pointer;display:inline-grid;place-items:center;font-weight:700}.calc-icon-btn#calc-close{border:0}.calc-icon-btn:hover{background:#ffffff1a}.calc-icon-btn .icon-max{display:inline}.calc-icon-btn .icon-min,.calc-icon-btn.expanded .icon-max{display:none}.calc-icon-btn.expanded .icon-min{display:inline}.calc-icon-btn svg{width:12px;height:12px;display:block}.calc-host{width:100%;flex:1;min-height:0}.ref-modal{position:fixed;top:0;right:0;bottom:0;left:0;display:none;z-index:1002}.ref-modal[aria-hidden=false]{display:block}.ref-modal-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#00000059}.ref-modal-dialog{position:fixed;top:var(--sat-header-height);left:50%;transform:translate(-50%);margin:0;width:min(960px,92vw);height:min(80vh,720px);background:#fff;border-radius:10px;border:1px solid #d1d5db;display:flex;flex-direction:column;overflow:hidden;z-index:1003}.ref-modal-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid #d1d5db;background:#000;color:#fff}.ref-modal-title{font-weight:800;font-size:16px;font-family:var(--sat-ui-font)}.ref-modal-close{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;background:transparent;font-size:22px;line-height:1;cursor:pointer;color:#fff}.ref-modal-body{flex:1;overflow:auto;padding:16px}.ref-img{max-width:100%;height:auto;display:block}.sat-container.calc-shift{transform:translate(20vw);transition:transform .2s ease}.sat-container.calc-shift .two-pane,.sat-container.calc-shift .mcq-content{transform:translate(20vw)}.sat-container.wide{max-width:1440px}.sat-container.math{max-width:94vw}.math-content{width:100%}.spr-layout{display:grid;grid-template-columns:50% .5rem 50%;gap:0;align-items:stretch;min-height:60vh}.spr-left{background:#f9fafb;padding:16px 20px;overflow:auto}.spr-panel{max-width:100%}.spr-title{font-weight:800;font-size:18px;font-family:var(--sat-ui-font);margin:0 0 12px;color:#111827}.spr-list{list-style:none;padding:0;margin:0 0 20px}.spr-list li{margin:8px 0;font-size:14px;line-height:1.5;color:#111827}.spr-strong{font-weight:700}.spr-fraction{display:inline-block;vertical-align:middle;font-size:.7em}.spr-num,.spr-den{display:block;line-height:1}.spr-subtitle{font-weight:700;font-size:16px;font-family:var(--sat-ui-font);margin:20px 0 12px;color:#111827}.spr-table-img{width:100%;height:auto;display:block;margin-top:12px}.spr-table-img .spr-grid{stroke:#111827;stroke-width:1.2;fill:none}.spr-table-img .spr-t{font-family:ui-sans-serif,system-ui,-apple-system,Helvetica,Arial;font-size:15px;fill:#111827}.spr-table-img .spr-th{font-weight:700}.spr-divider{background:#9ca3af;width:.5rem}.spr-right{padding:16px 20px;overflow:auto}.math-topbar{margin-bottom:12px}:root{--verbal-divider-width: .5rem;--verbal-left-frac: .5}.two-pane{display:grid;grid-template-columns:calc(var(--verbal-left-frac, .5) * 100%) var(--verbal-divider-width, .5rem) calc((1 - var(--verbal-left-frac, .5)) * 100%);gap:0;align-items:stretch;min-height:60vh;position:relative}.passage{background:#fffbe6;padding:16px 20px;overflow:auto}.passage h3{margin:0 0 12px;font-weight:700;font-size:18px;font-family:var(--sat-ui-font)}.passage p{margin:10px 0;font-family:Georgia,Times New Roman,serif;font-size:18px;line-height:1.6;color:#111827}.ev-highlight{padding:0 1px;cursor:pointer;border-radius:2px;transition:box-shadow .12s ease}.ev-highlight:hover{box-shadow:0 0 0 1px #2563eb66}.ev-highlight:focus{outline:2px solid #2563eb;outline-offset:2px}.ev-highlight.ev-underline{padding:0;background:none!important;border-bottom:2px solid currentColor}.verbal-divider-static{background:#000;width:.5rem;display:none}.verbal-divider{background:#000;width:.5rem;cursor:col-resize;display:flex;align-items:center;justify-content:center;position:relative}.verbal-handle{position:absolute;top:25%;width:2.5rem;left:50%;transform:translate(-50%);height:2rem;display:flex;align-items:center;justify-content:center;gap:4px;background:#ffffffe6;border:1px solid #000;border-radius:4px;pointer-events:none}.triangle-left,.triangle-right{font-size:12px;color:#000;line-height:1}.two-pane>section{padding:16px 20px;overflow:auto}.two-pane .topbar{margin-bottom:12px}.container{max-width:1440px;margin:0 auto;padding:calc(var(--sat-header-height) + 12px) var(--sat-side-margin) calc(var(--sat-footer-height) + 16px)}.topbar{display:grid;grid-template-columns:auto 1fr;align-items:center;margin:6px 0 8px;position:relative}.qnum{display:inline-grid;place-items:center;min-width:32px;height:28px;padding:0 10px;border-radius:6px;background:#000;color:#fff;font:600 var(--sat-qnum-size) var(--sat-ui-font)}.qbar{height:28px;background:var(--sat-gray-200);position:relative}.topbar:after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;background-image:repeating-linear-gradient(90deg,#000 0,#000 12px,#0000 12px,#0000 20px)}.diagram{display:grid;place-items:center;margin:18px 0 12px}.question{font-size:var(--sat-question-size);margin:12px 0 16px}.choices{display:grid;row-gap:40px;-moz-column-gap:10px;column-gap:10px;margin:0 0 20px;padding:0;list-style:none}.choice{position:relative}.choice input[type=radio]{position:absolute;opacity:0;top:0;right:0;bottom:0;left:0}.choice label{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid #000;color:var(--sat-fg);border-radius:8px;padding:12px 14px;font:400 var(--sat-choice-size) var(--sat-ui-font);cursor:pointer}.choice label:hover{background:#f9fafb}.key{width:28px;height:28px;display:inline-grid;place-items:center;border:1px solid var(--sat-gray);border-radius:999px;background:#fff;font-weight:600}.choice input[type=radio]:checked+label{background:#fff;border-color:var(--sat-blue);border-width:3px;box-shadow:0 0 0 2px #fff,0 0 0 3px #9ca3af}.footer{display:flex;justify-content:space-between;margin-top:8px}.nav-btn{text-decoration:none;color:#111827;background:#fff;border:1px solid #d1d5db;padding:10px 16px;border-radius:8px}.nav-btn.primary{background:#2563eb;color:#fff;border-color:#2563eb}.directions-toggle{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;background:transparent;color:#111827;font-family:var(--sat-ui-font);font-size:12px;cursor:pointer;padding:0;align-self:center;justify-self:start}.directions-toggle:hover{text-decoration:underline}.directions-dropdown[aria-hidden=true]{display:none}.directions-dropdown[aria-hidden=false]{display:block}.directions-dropdown{position:fixed;left:24px;top:calc(var(--sat-header-height) + 8px);z-index:1002}.directions-bubble{background:#fff;border:1.5px solid #111827;border-radius:12px;box-shadow:0 10px 24px #0003;position:relative;min-width:520px;max-width:70vw}.directions-bubble:after{content:"";position:absolute;left:24px;top:-12px;border-width:0 12px 12px 12px;border-style:solid;border-color:transparent transparent #ffffff transparent}.directions-bubble:before{content:"";position:absolute;left:24px;top:-14px;border-width:0 14px 14px 14px;border-style:solid;border-color:transparent transparent #111827 transparent}.directions-body{padding:12px 14px 14px}.directions-title{margin:0 0 6px;font-weight:800;font-size:16px;font-family:var(--sat-ui-font)}.directions-content{font-size:14px}.directions-close{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:2px solid #000000;background:#f59e0b;color:#000;font-weight:700;border-radius:8px;padding:6px 12px;cursor:pointer;margin-left:auto;display:block}.directions-close:hover{box-shadow:0 0 0 1px #000 inset}.review-page{min-height:100vh;display:grid;place-items:center;padding-bottom:calc(var(--sat-footer-height) + 16px)}.review-bubble{background:#fff;border:1.5px solid #111827;border-radius:12px;padding:10px 12px;box-shadow:0 10px 24px #0003;position:relative;min-width:560px}.review-header-bar{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px}.review-title{font-weight:800;font-size:19px;font-family:var(--sat-ui-font);color:#111827}.review-key-inline{display:inline-flex;gap:14px;align-items:center;justify-content:flex-end}.review-divider{height:1px;background:#d1d5db;margin:8px 0 10px}.review-grid{position:relative;display:grid;grid-template-columns:repeat(10,1fr);gap:8px;padding:10px 6px}.grid-cell{position:relative;width:46px;height:46px;border:2px dashed #111827;background:#fff;border-radius:0;cursor:pointer;display:inline-grid;place-items:center;transition:background-color .12s ease,border-color .12s ease}.grid-number{font-weight:800;color:#2563eb;font-family:var(--sat-ui-font);text-decoration:none;font-size:16px}.grid-cell:hover:not(.answered){background:#f3f4f6}.grid-cell.answered{background:#2563eb;border-style:solid;border-color:#2563eb}.grid-cell.answered .grid-number{color:#fff;text-decoration:underline;text-decoration-color:#fff;text-underline-offset:2px}.grid-cell.current .grid-number{text-decoration:underline;text-decoration-color:#2563eb;text-underline-offset:2px}.icon.dashed{display:inline-block;width:16px;height:16px;border:2px dashed #111827;border-radius:0}@media (max-width: 720px){.review-bubble{min-width:320px}.review-grid{grid-template-columns:repeat(5,1fr)}}.math-practice-two-pane{width:100%}.skill-breadcrumb{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#f3f4f6;border-bottom:2px solid #d1d5db;margin-bottom:16px}.skill-back-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid #111827;background:#fff;color:#111827;padding:6px 12px;border-radius:6px;cursor:pointer;font-weight:600;font-family:var(--sat-ui-font)}.skill-back-btn:hover{background:#f3f4f6}.skill-label{font-weight:600;color:#111827}.step-set-selection{padding:24px;text-align:center}.step-set-selection h3{margin:0 0 20px;font-size:20px;font-weight:700;font-family:var(--sat-ui-font)}.step-set-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;max-width:800px;margin:0 auto}.step-set-card{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:2px solid #111827;background:#fff;padding:20px;border-radius:8px;cursor:pointer;text-align:left;font-family:var(--sat-ui-font);transition:all .2s}.step-set-card:hover{background:#f3f4f6;box-shadow:0 4px 8px #0000001a}.step-set-card strong{display:block;margin-bottom:8px;font-size:16px;color:#111827}.solve-layout{display:grid;grid-template-columns:1fr 6px 1fr;gap:0;min-height:60vh;align-items:stretch}.solve-left{padding:16px;overflow-y:auto}.solve-right{padding:16px;overflow-y:auto;background:#f9fafb}.solve-divider{background:#9ca3af;width:6px}.original-question{margin-bottom:24px;padding-bottom:16px;border-bottom:2px solid #e5e7eb}.current-step{margin-top:16px}.step-prompt{font-size:var(--sat-question-size);font-family:var(--sat-ui-font);margin-bottom:16px;line-height:1.5}.current-step .choices{list-style:none;padding:0;margin:0 0 16px;display:flex;flex-direction:column;gap:12px}.choice-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid #111827;background:#fff;padding:12px 14px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:12px;font-family:var(--sat-ui-font);font-size:var(--sat-choice-size);width:100%;text-align:left;transition:all .2s}.choice-button:hover:not(:disabled){background:#f3f4f6;border-color:var(--sat-blue)}.choice-button:disabled{opacity:.6;cursor:not-allowed}.step-help{margin-top:16px;padding-top:16px;border-top:1px solid #e5e7eb}.hint-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid #111827;background:#fff;color:#111827;padding:8px 16px;border-radius:6px;cursor:pointer;font-weight:600;font-family:var(--sat-ui-font);margin-bottom:12px}.hint-button:hover{background:#f3f4f6}.hint-content{padding:12px;background:#fef3c7;border:1px solid #f59e0b;border-radius:6px;margin-top:8px;font-size:14px}.skills-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.skill-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid #2563eb;background:#eff6ff;color:#2563eb;padding:6px 12px;border-radius:6px;cursor:pointer;font-size:13px;font-weight:600;font-family:var(--sat-ui-font)}.skill-button:hover{background:#dbeafe}.back-to-final-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:2px solid #111827;background:#fff;color:#111827;padding:10px 20px;border-radius:8px;cursor:pointer;font-weight:700;font-family:var(--sat-ui-font);margin-top:24px;width:100%}.back-to-final-btn:hover{background:#f3f4f6}.progress-indicator{font-weight:600;font-size:14px;color:#6b7280;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid #e5e7eb}.solved-steps{margin-bottom:24px}.solved-steps h4{font-size:14px;font-weight:700;margin:0 0 12px;color:#111827;font-family:var(--sat-ui-font)}.solved-step{padding:10px 12px;background:#d1fae5;border:1px solid #10b981;border-radius:6px;margin-bottom:8px}.solved-step-answer{font-weight:600;color:#065f46;font-size:14px}.step-feedback{padding:16px;border-radius:8px;margin-top:16px}.step-feedback.correct{background:#d1fae5;border:2px solid #10b981}.step-feedback.incorrect{background:#fee2e2;border:2px solid #ef4444}.feedback-message{font-weight:700;font-size:16px;margin-bottom:8px;font-family:var(--sat-ui-font)}.step-feedback.correct .feedback-message{color:#065f46}.step-feedback.incorrect .feedback-message{color:#991b1b}.feedback-explanation{font-size:14px;line-height:1.5;margin-top:8px}.solve-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:2px solid #2563eb;background:#2563eb;color:#fff;padding:12px 24px;border-radius:8px;cursor:pointer;font-weight:700;font-family:var(--sat-ui-font);font-size:16px;margin-top:20px;width:100%}.solve-button:hover{background:#1d4ed8;border-color:#1d4ed8}@media (max-width: 768px){.solve-layout{grid-template-columns:1fr;grid-template-rows:auto auto}.solve-divider{display:none}.solve-right{border-top:2px solid #e5e7eb;margin-top:16px;padding-top:16px}.solved-steps{max-height:200px;overflow-y:auto}}.ev3-root-launcher{min-height:100vh;display:grid;place-items:center;padding:24px;background:#f6f8fb;color:#111827;font-family:var(--sat-ui-font)}.ev3-root-launcher__panel{width:min(680px,100%);border:1px solid #d8dee8;border-radius:8px;background:#fff;padding:clamp(24px,5vw,44px)}.ev3-root-launcher__eyebrow{margin:0 0 10px;color:#0f766e;font-size:12px;font-weight:800;text-transform:uppercase}.ev3-root-launcher h1{margin:0 0 12px;font-size:clamp(28px,5vw,42px);line-height:1.08}.ev3-root-launcher p{margin:0 0 20px;color:#475569;font-size:17px;line-height:1.5}.ev3-root-launcher__links{display:flex;flex-wrap:wrap;gap:10px}.ev3-root-launcher__primary{display:inline-flex;align-items:center;min-height:44px;border-radius:8px;background:#0f766e;color:#fff;padding:0 16px;text-decoration:none;font-weight:800}.lf-page{min-height:100vh;background:#f6f8fb;color:#111827;font-family:var(--sat-ui-font)}.lf-header{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px clamp(16px,4vw,44px);background:#fff;border-bottom:1px solid #d8dee8}.lf-header h1{margin:0;font-size:24px;line-height:1.1}.lf-kicker{margin:0 0 4px;font-size:12px;text-transform:uppercase;color:#64748b;font-weight:700}.lf-home-link{color:#111827;text-decoration:none;border:1px solid #cbd5e1;background:#fff;border-radius:8px;padding:9px 13px;font-weight:700}.lf-main{display:grid;grid-template-columns:minmax(240px,300px) 1fr;gap:0;min-height:calc(100vh - 72px)}.lf-sidebar{background:#fff;border-right:1px solid #d8dee8;padding:18px}.lf-workspace{padding:clamp(16px,3vw,32px)}.lf-section-heading{font-size:12px;text-transform:uppercase;color:#64748b;font-weight:800;margin-bottom:10px}.lf-picker-panel{display:grid;gap:12px}.lf-select-field{display:grid;gap:6px}.lf-select-field span{color:#334155;font-size:12px;font-weight:800}.lf-select-field select{width:100%;min-height:38px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;color:#111827;font:700 13px/1.2 var(--sat-ui-font);padding:8px 34px 8px 10px}.lf-selected-problem-summary{display:grid;gap:5px;border:1px solid #d8dee8;border-radius:8px;background:#f8fafc;padding:10px}.lf-selected-problem-summary strong{color:#111827;font-size:14px;line-height:1.25}.lf-selected-problem-summary span,.lf-selected-problem-summary em{color:#475569;font-size:12px;font-style:normal;font-weight:700}.lf-selected-problem-summary p{margin:0;color:#64748b;font-size:12px;line-height:1.35}.lf-problem-type-group h2{font-size:16px;margin:0 0 10px}.lf-problem-type-button,.lf-primary-button,.lf-debug-panel button{-webkit-appearance:none;-moz-appearance:none;appearance:none;border-radius:8px;cursor:pointer;font-family:var(--sat-ui-font)}.lf-problem-type-button{display:flex;width:100%;align-items:center;justify-content:space-between;gap:12px;border:1px solid #cbd5e1;background:#f8fafc;color:#111827;padding:12px;text-align:left}.lf-problem-type-button small{display:block;margin-top:4px;color:#64748b;font-size:12px;font-weight:600;line-height:1.35}.lf-problem-type-button em{color:#0f766e;font-size:12px;font-style:normal;font-weight:800;white-space:nowrap}.lf-problem-type-button-selected{border-color:#0f766e;background:#eef6f5;box-shadow:0 0 0 2px #0f766e24}.lf-primary-button{margin-top:14px;border:1px solid #0f766e;background:#0f766e;color:#fff;padding:10px 14px;font-weight:800}.lf-primary-button:disabled,.lf-problem-type-button:disabled,.lf-debug-panel button:disabled{cursor:not-allowed;opacity:.55}.lf-empty-state{display:grid;min-height:300px;place-items:center;border:1px dashed #94a3b8;background:#fff;border-radius:8px}.lf-empty-state h2{font-size:20px;margin:0}.lf-progress-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(180px,260px);gap:18px;align-items:center;margin-bottom:18px}.lf-progress-row h2,.lf-progress-row p{margin:0}.lf-progress-row p{margin-top:4px;color:#64748b}.lf-progress-meter{height:12px;background:#e2e8f0;border:1px solid #cbd5e1;border-radius:8px;overflow:hidden}.lf-progress-meter span{display:block;height:100%;background:#0f766e}.lf-two-column{display:grid;grid-template-columns:minmax(0,1fr) minmax(320px,.9fr);gap:18px;align-items:start}.lf-practice-layout{display:grid;grid-template-columns:minmax(280px,.72fr) minmax(360px,1.28fr);gap:18px;align-items:start}.lf-problem-panel,.lf-step-panel,.lf-reveal-panel,.lf-answer-column,.lf-problem-card,.lf-work-history,.lf-work-completion,.lf-current-step-card{border:1px solid #d8dee8;border-radius:8px;background:#fff;padding:18px}.lf-answer-column{position:sticky;top:18px;display:grid;gap:14px}.lf-answer-column-placeholder{min-height:1px}.lf-answer-waiting,.lf-active-answer,.lf-answer-completion{display:grid;gap:10px}.lf-answer-waiting h2,.lf-answer-panel-title h2{margin:0;font-size:20px;line-height:1.25}.lf-answer-waiting p,.lf-step-start-card p{margin:0;color:#64748b;line-height:1.4}.lf-work-column{display:grid;gap:18px}.lf-step-start-card{display:grid;gap:12px;margin-top:14px;border-top:1px solid #e2e8f0;padding-top:14px}.lf-step-start-card .lf-primary-button,.lf-answer-completion .lf-primary-button{width:-moz-fit-content;width:fit-content}.lf-current-step-card{margin-top:14px;background:#f8fafc}.lf-work-completion{display:grid;gap:10px}.lf-content-block{margin-bottom:12px}.lf-content-block p{margin:0 0 8px;font-size:17px;line-height:1.45}.lf-visual-svg{width:min(100%,680px);margin:12px 0 4px;overflow:hidden;border:1px solid #d8dee8;border-radius:8px;background:#fff}.lf-visual-svg svg{display:block;width:100%;height:auto}.lf-visual-unavailable{color:#64748b;font-size:14px}.lf-math{margin:0;white-space:pre-wrap;font-size:20px;line-height:1.4;background:#eef6f5;border:1px solid #cde4df;border-radius:8px;padding:12px;font-family:ui-monospace,SFMono-Regular,Consolas,Liberation Mono,monospace}.lf-answer-form{display:grid;gap:10px;margin-top:16px}.lf-answer-form label,.lf-choice-fieldset legend{font-weight:800}.lf-answer-form input{width:100%;min-height:46px;border:1px solid #94a3b8;border-radius:8px;padding:10px 12px;font-size:18px}.lf-text-answer-field{display:grid;gap:8px}.lf-text-answer-field small{color:#64748b;font-weight:600}.lf-choice-fieldset{display:grid;gap:10px;border:0;padding:0;margin:0}.lf-choice-button{-webkit-appearance:none;-moz-appearance:none;appearance:none;display:grid;grid-template-columns:36px minmax(0,1fr);gap:12px;align-items:center;width:100%;min-height:56px;border:1px solid #94a3b8;border-radius:8px;background:#fff;color:#111827;padding:10px 12px;cursor:pointer;text-align:left}.lf-choice-button:hover,.lf-choice-button-selected{border-color:#0f766e;box-shadow:0 0 0 2px #0f766e24}.lf-choice-label{display:inline-grid;place-items:center;width:30px;height:30px;border:1px solid #64748b;border-radius:999px;font-weight:800}.lf-choice-button-selected .lf-choice-label{border-color:#0f766e;background:#0f766e;color:#fff}.lf-choice-content .lf-content-block{margin-bottom:0}.lf-choice-content .lf-math{background:transparent;border:0;padding:0;font-size:18px}.lf-alert{border-radius:8px;padding:12px 14px;margin:14px 0;font-weight:700}.lf-alert-error{background:#fee2e2;border:1px solid #ef4444;color:#991b1b}.lf-alert-correct{background:#dcfce7;border:1px solid #16a34a;color:#166534}.lf-alert-retry{background:#fef3c7;border:1px solid #f59e0b;color:#92400e}.lf-reveal-panel{margin-top:18px}.lf-completed-step{border-top:1px solid #e2e8f0;padding-top:14px;margin-top:14px}.lf-completed-step:first-of-type{border-top:0;padding-top:0}.lf-completed-step-title{font-weight:800;margin-bottom:8px}.lf-completion{display:grid;gap:12px}details.lf-debug-panel{margin-top:18px;border:1px solid #d8dee8;border-radius:8px;background:#fff;padding:10px 12px}.lf-debug-panel summary{cursor:pointer;color:#64748b;font-size:12px;font-weight:800}.lf-debug-panel-content{display:grid;gap:12px;margin-top:12px}.lf-debug-panel p{margin:0;color:#64748b}.lf-debug-panel button{width:-moz-fit-content;width:fit-content;border:1px solid #475569;background:#fff;color:#111827;padding:9px 12px;font-weight:800}.lf-debug-panel pre{max-height:320px;overflow:auto;background:#111827;color:#e5e7eb;border-radius:8px;padding:14px;font-size:12px}.lf-muted{color:#64748b}@media (max-width: 900px){.lf-main,.lf-two-column,.lf-practice-layout,.lf-progress-row{grid-template-columns:1fr}.lf-answer-column{position:static}.lf-answer-column-placeholder{display:none}.lf-sidebar{border-right:0;border-bottom:1px solid #d8dee8}}