/*! 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,::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;-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]){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}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.start{inset-inline-start:var(--spacing)}.end{inset-inline-end:var(--spacing)}.block{display:block}.hidden{display:none}.table{display:table}}:root{--navy:#112640;--navy-2:#1b3b60;--blue:#2d67e8;--teal:#159b98;--ink:#172033;--muted:#66748a;--line:#d8e0eb;--paper:#f6f8fb;--white:#fff;--green:#087b59;--amber:#a85d0a}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input{font:inherit}a,button,label{-webkit-tap-highlight-color:transparent}main{min-height:100vh}.hero{color:#fff;background:var(--navy);padding:0 max(24px,50vw - 540px)}.topbar{border-bottom:1px solid #ffffff21;justify-content:space-between;align-items:center;min-height:72px;display:flex}.brand{color:#fff;align-items:center;gap:10px;font-weight:800;text-decoration:none;display:inline-flex}.brand-mark{color:#fff;background:var(--teal);border-radius:10px;place-items:center;width:40px;height:40px;font-family:Georgia,serif;font-style:italic;display:inline-grid}.reset-button{color:#fff;cursor:pointer;background:0 0;border:1px solid #ffffff40;border-radius:9px;padding:9px 13px}.top-actions{align-items:center;gap:9px;display:flex}.ghost-link{color:#fff;border:1px solid #ffffff40;border-radius:9px;padding:9px 13px;font-weight:750;text-decoration:none}.ghost-link:hover,.reset-button:hover{background:#ffffff14}.hero-grid{grid-template-columns:1.45fr .55fr;align-items:end;gap:48px;padding:56px 0 44px;display:grid}.eyebrow,.section-heading p,.problem-kicker,.brief-label{color:#77ded7;text-transform:uppercase;letter-spacing:.12em;margin:0 0 8px;font-size:.76rem;font-weight:850}.hero h1{letter-spacing:-.055em;max-width:720px;margin:0;font-size:clamp(2.8rem,7vw,5.25rem);line-height:.98}.hero-lead{color:#d1dcea;max-width:680px;margin:24px 0 0;font-size:1.15rem;line-height:1.65}.progress-card{background:#ffffff12;border:1px solid #ffffff24;border-radius:14px;grid-template-columns:auto 1fr;align-items:center;gap:18px;padding:20px;display:grid}.progress-card>strong{white-space:nowrap;font-size:2rem}.progress-card>strong small{color:#b9c9dc;font-size:.85rem}.progress-card span{margin-bottom:9px;font-size:.84rem;font-weight:750;display:block}.progress-card small{color:#b9c9dc}.progress-track{background:#ffffff24;border-radius:999px;height:7px;overflow:hidden}.progress-track i{border-radius:inherit;background:#51d5ca;height:100%;display:block}.lesson-map{border-top:1px solid #ffffff21;grid-template-columns:repeat(4,1fr);display:grid}.lesson-map a{color:#e3ebf4;border-right:1px solid #ffffff21;align-items:center;gap:12px;padding:18px 14px;text-decoration:none;display:flex}.lesson-map a:last-child{border-right:0}.lesson-map strong{background:var(--teal);border-radius:8px;place-items:center;width:30px;height:30px;display:grid}.lesson-map span{font-size:.86rem;font-weight:750;line-height:1.3}.lesson-map small{color:#9fb2c8;font-weight:500}.lesson-section{max-width:1080px;margin:0 auto;padding:68px 24px 24px}.lesson-section:last-of-type{padding-bottom:78px}.tinted{position:relative}.tinted:before{content:"";z-index:-1;background:#edf3f8;border-radius:24px;position:absolute;inset:30px max(8px,522px - 50vw) 0}.section-heading{align-items:center;gap:16px;margin-bottom:14px;display:flex}.section-heading>span{color:#fff;background:var(--teal);border-radius:13px;flex:0 0 52px;place-items:center;width:52px;height:52px;font-weight:900;display:grid}.section-heading p{color:var(--teal);margin-bottom:3px}.section-heading h2{color:var(--navy);letter-spacing:-.035em;margin:0;font-size:clamp(1.8rem,4vw,2.5rem)}.section-lead{max-width:780px;color:var(--muted);margin:0 0 28px 68px;line-height:1.65}.question-card{border:1px solid var(--line);background:#fff;border-radius:14px;margin-bottom:16px;padding:22px}.question-card.correct{border-color:#087b5980}.question-card.wrong{border-color:#a85d0a8c}.question-meta{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;align-items:center;gap:9px;font-size:.75rem;font-weight:800;display:flex}.question-number{color:#fff;background:var(--navy-2);letter-spacing:0;border-radius:8px;place-items:center;width:30px;height:30px;font-size:.82rem;display:grid}.question-card h3{color:var(--navy);margin:13px 0 17px;font-size:1.12rem;line-height:1.45}.two-column,.step-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}.two-column>.question-card,.step-grid>.question-card{margin-bottom:16px}.choices{gap:8px;display:grid}.choice{border:1px solid var(--line);cursor:pointer;border-radius:9px;grid-template-columns:auto 30px 1fr;align-items:center;gap:9px;padding:10px 12px;display:grid}.choice:hover,.choice.selected{background:#f3f6ff;border-color:#8eabea}.choice input{margin:0}.choice-letter{width:28px;height:28px;color:var(--navy);background:#e8eef7;border-radius:7px;place-items:center;font-weight:850;display:grid}.answer-actions,.input-row{align-items:center;gap:12px;margin-top:16px;display:flex}.answer-input,.power-table input,.calc-grid input{min-height:42px;color:var(--ink);background:#fff;border:1px solid #bdc9d9;border-radius:8px;padding:9px 11px}.answer-input{width:min(320px,100%)}.answer-input:focus,.power-table input:focus,.calc-grid input:focus{border-color:var(--blue);outline:3px solid #2d67e824}.check-button{color:#fff;background:var(--blue);cursor:pointer;white-space:nowrap;border:0;border-radius:8px;min-height:42px;padding:9px 15px;font-weight:800}.check-button:disabled{opacity:.42;cursor:not-allowed}.feedback{border-radius:8px;padding:9px 11px;font-size:.86rem;line-height:1.4}.feedback.correct{color:var(--green);background:#e7f6f1}.feedback.wrong{color:var(--amber);background:#fff2df}.power-table-wrap{overflow-x:auto}.power-table{border-collapse:collapse;text-align:center;width:100%}.power-table th,.power-table td{border:1px solid var(--line);min-width:105px;padding:10px}.power-table th:first-child{min-width:84px;color:var(--navy);background:#edf2f8}.power-table input{text-align:center;width:100%}.calc-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;display:grid}.calc-grid label{gap:8px;display:grid}.calc-grid label>span{color:var(--navy);text-align:center;font-family:Georgia,serif;font-size:1.3rem}.calc-grid input{text-align:center;width:100%}.task-brief{color:#fff;background:var(--navy);border-radius:15px;grid-template-columns:1fr auto;align-items:center;gap:30px;margin:26px 0 18px;padding:24px;display:grid}.task-brief h3{margin:0 0 12px;font-size:1.3rem}.task-brief ol{color:#d1dcea;margin:0;padding-left:20px;line-height:1.75}.task-brief code{color:#fff;background:#ffffff1a;border-radius:5px;padding:2px 6px}.primary-link{color:#fff;background:var(--teal);white-space:nowrap;border-radius:9px;padding:12px 16px;font-weight:850;text-decoration:none}.guided-problem{border:1px solid var(--line);background:#fff;border-radius:16px;margin:34px 0 54px;padding:24px}.problem-heading{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:18px;display:flex}.problem-kicker{color:var(--teal)}.problem-heading h3{color:var(--navy);margin:0;font-size:1.45rem}.read-first{color:var(--navy);white-space:nowrap;background:#e8eef7;border-radius:999px;padding:7px 10px;font-size:.75rem;font-weight:850}.source-image{border:1px solid var(--line);background:#fff;border-radius:9px;width:100%;overflow:hidden}.source-image img{width:100%;height:auto;display:block}.source-image.exponential-source{aspect-ratio:1774/1242}.source-image.minimum-source{aspect-ratio:1020/670}.source-image.transform-source{aspect-ratio:1020/770}.source-image.icecream-source{aspect-ratio:1020/690}.guided-label{border-bottom:1px solid var(--line);align-items:center;gap:16px;margin:22px 0 14px;padding-bottom:13px;display:flex}.guided-label span{color:#fff;background:var(--teal);white-space:nowrap;border-radius:7px;padding:7px 10px;font-size:.8rem;font-weight:850}.guided-label p{color:var(--muted);margin:0;font-size:.88rem}.guided-problem>.question-card:last-child{background:#f4f7ff;border-color:#a9bdec;margin-bottom:0}.context-box{color:var(--navy);border-left:4px solid var(--teal);background:#eef4f7;border-radius:7px;grid-template-columns:1.1fr 1fr 1fr;gap:8px;margin-bottom:16px;padding:14px;font-size:.88rem;display:grid}.homework-page{background:#f4f7fb}.homework-hero{color:#fff;background:radial-gradient(circle at 90% 10%, #159b9838, transparent 28rem), var(--navy);padding:0 max(24px,50vw - 540px)}.homework-hero-grid{grid-template-columns:minmax(0,1.4fr) minmax(260px,.6fr);align-items:end;gap:48px;padding:58px 0 46px;display:grid}.homework-hero h1{letter-spacing:-.055em;max-width:760px;margin:0;font-size:clamp(3rem,7vw,5.5rem);line-height:.97}.homework-hero-grid>div:first-child>p:last-child{color:#d1dcea;max-width:720px;margin:24px 0 0;font-size:1.12rem;line-height:1.65}.homework-progress{background:#ffffff12;border:1px solid #ffffff24;border-radius:14px;padding:20px}.homework-progress>strong{margin-bottom:3px;font-size:2rem;display:block}.homework-progress>strong small{color:#b9c9dc;font-size:.86rem}.homework-progress>span{color:#d1dcea;margin-bottom:12px;font-size:.85rem;font-weight:750;display:block}.homework-progress>small{color:#b9c9dc;margin-top:8px;display:block}.homework-map{border-top:1px solid #ffffff21;grid-template-columns:repeat(2,1fr);display:grid}.homework-map a{color:#fff;border-right:1px solid #ffffff21;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:18px 16px;text-decoration:none;display:grid}.homework-map a:last-child{border-right:0}.homework-map a>span{background:var(--teal);border-radius:8px;place-items:center;width:34px;height:34px;font-size:.8rem;font-weight:900;display:grid}.homework-map a>small{color:#9fb2c8}.homework-section{max-width:1080px;margin:0 auto;padding:70px 24px 20px}.homework-section:last-of-type{padding-bottom:80px}.homework-linear{position:relative}.homework-linear:before{content:"";z-index:-1;background:#eaf1f7;border-radius:24px;position:absolute;inset:32px max(8px,522px - 50vw) 0}.homework-section-heading{margin-bottom:30px}.homework-section-heading p{color:var(--teal);text-transform:uppercase;letter-spacing:.12em;margin:0 0 5px;font-size:.76rem;font-weight:850}.homework-section-heading h2{color:var(--navy);letter-spacing:-.045em;margin:0 0 8px;font-size:clamp(2rem,5vw,3.2rem)}.homework-section-heading>span{color:var(--muted);line-height:1.6}.homework-unit{border:1px solid var(--line);background:#fff;border-radius:16px;margin-bottom:50px;padding:24px}.homework-unit-heading{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:20px;display:flex}.homework-unit-heading h2{color:var(--navy);letter-spacing:-.025em;margin:10px 0 4px;font-size:1.55rem}.homework-unit-heading p{color:var(--muted);margin:0;font-size:.84rem}.model-type{text-transform:uppercase;letter-spacing:.06em;border-radius:999px;padding:6px 9px;font-size:.73rem;font-weight:900;display:inline-flex}.model-type.nonlinear{color:#6d3db2;background:#f0e8fc}.model-type.linear{color:#087b59;background:#e3f5ef}.difficulty-badge{color:#9a4d00;background:#fff0db;border-radius:7px;padding:7px 10px;font-size:.75rem;font-weight:900}.difficulty-badge.medium{color:#215e91;background:#e7f1fb}.homework-instruction{color:var(--navy);border-left:4px solid var(--teal);background:#edf3f8;border-radius:7px;align-items:center;gap:12px;margin:20px 0 14px;padding:12px 14px;font-size:.87rem;display:flex}.homework-instruction span{color:var(--muted)}.homework-unit>.question-card:last-child{background:#f4f7ff;border-color:#a9bdec;margin-bottom:0}.source-image.homework-quadratic{aspect-ratio:1020/810}.source-image.homework-account{aspect-ratio:1020/590}.source-image.homework-exponential{aspect-ratio:1774/1242}.source-image.homework-sandwich{aspect-ratio:1280/720}.source-image.homework-bird{aspect-ratio:1020/850}.source-image.homework-browser-shot{aspect-ratio:1280/720}.source-image.homework-houses{aspect-ratio:1020/770}.source-image.homework-beach{aspect-ratio:1020/640}footer{color:#cbd6e4;background:var(--navy);justify-content:space-between;align-items:center;gap:20px;padding:32px max(24px,50vw - 540px);display:flex}footer>div{color:#fff;align-items:center;gap:10px;display:flex}footer p{margin:0;font-size:.86rem}@media (width<=820px){.hero-grid,.homework-hero-grid{grid-template-columns:1fr}.progress-card,.homework-progress{max-width:430px}.lesson-map{grid-template-columns:repeat(2,1fr)}.lesson-map a:nth-child(2){border-right:0}.lesson-map a:nth-child(-n+2){border-bottom:1px solid #ffffff21}.two-column,.step-grid{grid-template-columns:1fr;gap:0}.calc-grid{grid-template-columns:repeat(2,1fr)}.context-box{grid-template-columns:1fr}}@media (width<=560px){.hero{padding-inline:17px}.hero-grid{padding:42px 0 34px}.hero h1{font-size:3rem}.homework-hero{padding-inline:17px}.homework-hero-grid{padding:42px 0 34px}.homework-hero h1{font-size:3rem}.brand>span:last-child{display:none}.top-actions{gap:6px}.ghost-link,.reset-button{padding:8px 9px;font-size:.78rem}.lesson-map{grid-template-columns:1fr}.lesson-map a{border-bottom:1px solid #ffffff21;border-right:0}.lesson-section,.homework-section{padding:54px 15px 16px}.homework-map{grid-template-columns:1fr}.homework-map a{border-bottom:1px solid #ffffff21;border-right:0}.section-lead{margin-left:0}.question-card,.guided-problem{padding:17px}.homework-unit{padding:16px}.problem-heading,.guided-label,.task-brief,.answer-actions,.input-row,footer{flex-direction:column;align-items:stretch}.homework-unit-heading,.homework-instruction{flex-direction:column;align-items:flex-start}.problem-heading,.guided-label,.task-brief{display:flex}.read-first,.guided-label span{align-self:flex-start}.answer-input,.check-button{width:100%}.calc-grid{grid-template-columns:1fr 1fr}.power-table th,.power-table td{min-width:82px;padding:7px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}.psda-page{background:#f2f5f8}.psda-hero{color:#fff;background:radial-gradient(circle at 82% 18%,#24b0a733,#0000 27rem),linear-gradient(135deg,#10243d 0%,#173657 100%);padding:0 max(24px,50vw - 560px)}.psda-hero-grid{grid-template-columns:minmax(0,1.7fr) minmax(250px,.65fr);align-items:end;gap:54px;padding:68px 0 54px;display:grid}.psda-hero h1{letter-spacing:-.065em;max-width:830px;margin:10px 0 18px;font-size:clamp(3.1rem,6.3vw,5.7rem);line-height:.93}.psda-hero-grid>div>p:last-child{color:#d4dfeb;max-width:720px;margin:0;font-size:1.06rem;line-height:1.65}.psda-progress{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff12;border:1px solid #ffffff29;border-radius:16px;padding:24px}.psda-progress strong{font-size:2.3rem;line-height:1;display:block}.psda-progress strong small{color:#a9bacd;font-size:1rem}.psda-progress>span{color:#d4dfeb;margin:8px 0 17px;display:block}.psda-progress>div{background:#ffffff24;border-radius:99px;height:7px;overflow:hidden}.psda-progress i{border-radius:inherit;background:#47c8b8;height:100%;transition:width .25s;display:block}.psda-rules{border-top:1px solid #ffffff24;grid-template-columns:repeat(3,1fr);display:grid}.psda-rules span{color:#d7e1ec;border-right:1px solid #ffffff24;padding:20px 18px}.psda-rules span:last-child{border-right:0}.psda-rules b{color:#fff;background:var(--teal);border-radius:8px;place-items:center;width:27px;height:27px;margin-right:9px;display:inline-grid}.psda-problems{max-width:1120px;margin:0 auto;padding:68px 24px 30px}.psda-problem{background:#fff;border:1px solid #d5dee9;border-radius:20px;margin-bottom:42px;padding:26px;transition:border-color .2s,box-shadow .2s;overflow:hidden;box-shadow:0 16px 42px #11264012}.psda-problem.correct{border-color:#43a983;box-shadow:0 16px 42px #087b591f,inset 0 5px #24a276}.psda-problem.wrong{border-color:#e4b478}.psda-problem-head{grid-template-columns:auto 1fr auto;align-items:start;gap:16px;margin-bottom:20px;display:grid}.psda-index{color:#fff;background:var(--navy);text-align:center;border-radius:11px;min-width:48px;padding:12px 8px;font-weight:900}.psda-problem-head p{color:var(--teal);letter-spacing:.06em;text-transform:uppercase;margin:0 0 7px;font-size:.75rem;font-weight:900}.psda-problem-head h2{color:var(--navy);letter-spacing:-.03em;margin:0 0 5px;font-size:1.62rem}.psda-problem-head small{color:var(--muted)}.psda-level{border-radius:8px;padding:7px 10px;font-size:.75rem;font-weight:900}.psda-level.easy{color:#086448;background:#dff5eb}.psda-level.medium{color:#1655a2;background:#e4efff}.psda-level.hard{color:#965000;background:#fff0da}.psda-source{border:1px solid var(--line);background:#fff;border-radius:11px;width:100%;overflow:hidden}.psda-source img{width:100%;height:auto;display:block}.psda-text-source{color:#172033;background:#fff;border:1px solid #d9deea;border-radius:16px;margin:0 32px 24px;padding:28px 30px;font-family:Georgia,Times New Roman,serif;font-size:clamp(1.05rem,1.6vw,1.28rem);line-height:1.65}.psda-text-source p{white-space:pre-line;margin:0}.practice-theory-card{color:#fff;background:linear-gradient(135deg,#10233f,#173b69);border-radius:22px;grid-template-columns:minmax(0,1.35fr) minmax(240px,.65fr);gap:28px;padding:34px;display:grid;box-shadow:0 18px 45px #142b4a2e}.practice-theory-copy>p{color:#86d6c7;letter-spacing:.1em;text-transform:uppercase;margin:0 0 8px;font-size:.74rem;font-weight:800}.practice-theory-copy h2{margin:0 0 14px;font-size:clamp(1.45rem,3vw,2.15rem)}.practice-theory-copy>div{color:#dce8f5;white-space:pre-line;max-width:760px;line-height:1.65}.practice-theory-copy aside{color:#fff;background:#ffffff14;border-left:3px solid #86d6c7;margin-top:16px;padding:11px 14px;line-height:1.45}.practice-theory-formulas{align-content:center;gap:10px;display:grid}.practice-theory-formulas code{color:#fff;background:#ffffff17;border:1px solid #ffffff2e;border-radius:12px;padding:13px 15px;font-family:Georgia,Times New Roman,serif;font-size:1.08rem;display:block}@media (width<=720px){.practice-theory-card{grid-template-columns:1fr;padding:25px 21px}}.psda-crop-ratios{aspect-ratio:1020/475}.psda-crop-percentages{aspect-ratio:1020/600}.psda-crop-boxplots{aspect-ratio:1020/700}.psda-crop-two-variable{aspect-ratio:1020/540}.psda-crop-probability{aspect-ratio:1020/525}.psda-crop-inference{aspect-ratio:1020/735}.psda-crop-claims{aspect-ratio:1020/520}.psda-crop-easy-rate{aspect-ratio:1020/300}.psda-crop-easy-probability{aspect-ratio:1020/475}.psda-crop-easy-median{aspect-ratio:1020/530}.psda-crop-easy-quadratic{aspect-ratio:1020/720}.psda-crop-easy-percent{aspect-ratio:1020/445}.psda-crop-medium-median{aspect-ratio:1020/495}.psda-crop-medium-probability{aspect-ratio:1020/805}.psda-crop-medium-rate{aspect-ratio:1020/515}.psda-crop-medium-residual{aspect-ratio:1020/690}.psda-crop-medium-claims{aspect-ratio:1020/610}.psda-crop-medium-percent{aspect-ratio:1020/290}.psda-crop-medium-margin{aspect-ratio:1020/480}.psda-crop-medium-average-rate{aspect-ratio:1020/810}.psda-main-answer{background:#f7f9fc;border:1px solid #cfd9e6;border-radius:14px;margin-top:18px;padding:20px}.psda-problem.correct .psda-main-answer{background:#f0faf6;border-color:#95d0b8}.psda-answer-heading{justify-content:space-between;align-items:center;gap:18px;margin-bottom:14px;display:flex}.psda-answer-heading span:first-child,.psda-walkthrough-title span{color:var(--teal);letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px;font-size:.72rem;font-weight:900;display:block}.psda-answer-heading strong{color:var(--navy);font-size:1rem}.psda-solved-mark{color:#076b4d;background:#dff3ea;border-radius:99px;padding:7px 10px;font-size:.82rem;font-weight:900}.psda-choices{gap:8px;display:grid}.psda-choice{cursor:pointer;background:#fff;border:1px solid #d6deea;border-radius:10px;grid-template-columns:auto 30px 1fr;align-items:center;gap:10px;min-height:48px;padding:9px 12px;display:grid}.psda-choice.selected{background:#f0f4ff;border-color:#7d9ce9}.psda-choice>span{width:28px;height:28px;color:var(--navy);background:#eef2f7;border-radius:8px;place-items:center;font-weight:900;display:grid}.psda-choice strong{font-weight:650}.psda-input{background:#fff;border:1px solid #cbd6e3;border-radius:10px;outline:none;width:min(100%,440px);min-height:49px;padding:0 14px}.psda-input:focus{border-color:#6c90e9;box-shadow:0 0 0 3px #2d67e81a}.psda-main-actions{flex-wrap:wrap;gap:9px;margin-top:14px;display:flex}.psda-check,.psda-hint-button,.psda-step-check{cursor:pointer;border-radius:9px;min-height:42px;padding:0 15px;font-weight:850}.psda-check{color:#fff;background:var(--blue);border:0}.psda-check:disabled,.psda-step-check:disabled{cursor:not-allowed;opacity:.45}.psda-hint-button{color:var(--navy);background:#fff;border:1px solid #c9d4e2}.psda-main-feedback,.psda-step-feedback{border-radius:8px;margin:12px 0 0;padding:10px 12px;font-size:.9rem;line-height:1.45}.psda-main-feedback.wrong,.psda-step-feedback.wrong{color:#7f4500;background:#fff0dc}.psda-main-feedback.correct,.psda-step-feedback.correct{color:#066747;background:#e0f4ea}.psda-walkthrough{background:#f7f9fc;border:1px solid #cad6e5;border-radius:14px;margin-top:16px;overflow:hidden}.psda-walkthrough-title{border-bottom:1px solid #d7dfeb;justify-content:space-between;gap:24px;padding:18px 20px;display:flex}.psda-walkthrough-title h3{color:var(--navy);margin:0;font-size:1.25rem}.psda-walkthrough-title p{color:var(--muted);margin:0;font-size:.84rem}.psda-step{border-bottom:1px solid #dbe2ec;grid-template-columns:auto 1fr;gap:16px;padding:20px;display:grid}.psda-step:last-child{border-bottom:0}.psda-step.correct{background:#f1faf6}.psda-step-number{color:#fff;background:var(--navy);border-radius:10px;place-items:center;width:34px;height:34px;font-weight:900;display:grid}.psda-step-body h4{color:var(--navy);margin:5px 0 12px;font-size:1rem}.psda-step-check{color:var(--navy);background:#fff;border:1px solid #bfcddd;margin-top:10px}@media (width<=760px){.psda-hero{padding-inline:17px}.psda-hero-grid{grid-template-columns:1fr;gap:28px;padding:44px 0 36px}.psda-hero h1{font-size:clamp(2.8rem,14vw,4.2rem)}.psda-rules{grid-template-columns:1fr}.psda-rules span{border-bottom:1px solid #ffffff21;border-right:0}.psda-problems{padding:38px 14px 20px}.psda-problem{border-radius:15px;padding:15px}.psda-problem-head{grid-template-columns:auto 1fr}.psda-level{grid-column:2;justify-self:start}.psda-problem-head h2{font-size:1.35rem}.psda-main-answer{padding:14px}.psda-answer-heading,.psda-walkthrough-title{flex-direction:column;align-items:flex-start}.psda-main-actions>button,.psda-input{width:100%}.psda-step{grid-template-columns:1fr;padding:16px}.psda-step-number{width:30px;height:30px}}.timed-start-page .psda-hero{min-height:100vh}.timed-start-wrap{max-width:780px;padding:64px 0 86px}.timed-start-wrap h1{letter-spacing:-.065em;margin:10px 0 28px;font-size:clamp(3.2rem,8vw,6rem);line-height:.92}.timed-warning{color:#e8f0f7;background:#ffffff14;border:1px solid #ffffff2e;border-radius:16px;padding:22px 24px}.timed-warning>strong{font-size:1.08rem}.timed-warning ul{color:#cad8e6;margin:14px 0 0;padding-left:21px;line-height:1.7}.timed-name-field{color:#dbe6f0;gap:8px;margin-top:22px;font-size:.85rem;font-weight:850;display:grid}.timed-name-field input{width:min(100%,420px);min-height:50px;color:var(--ink);background:#fff;border:1px solid #ffffff59;border-radius:10px;padding:0 14px}.timed-start-button{color:#fff;background:var(--teal);cursor:pointer;border:0;border-radius:10px;min-height:50px;margin-top:14px;padding:0 20px;font-weight:900}.timed-start-button:disabled{cursor:wait;opacity:.55}.attempt-banner{background:#fff;border:1px solid #c8d6e5;border-radius:14px;justify-content:space-between;gap:18px;max-width:1072px;margin:28px auto -30px;padding:16px 18px;display:flex}.attempt-banner>div{align-items:center;gap:10px;display:flex}.attempt-banner span{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-size:.78rem;font-weight:800}.attempt-banner strong{color:var(--navy)}.attempt-banner button{color:var(--navy);cursor:pointer;background:#f7f9fc;border:1px solid #c6d3e1;border-radius:8px;padding:8px 11px;font-weight:800}.attempt-banner.finished{background:#f0faf6;border-color:#8cc9b1}.psda-problem.concealed{box-shadow:none;background:#f8fafc}.concealed-problem{background:#eef3f8;border:1px dashed #aab9ca;border-radius:13px;justify-content:space-between;align-items:center;gap:24px;min-height:170px;padding:30px;display:flex}.concealed-problem div{gap:7px;display:grid}.concealed-problem span{color:var(--teal);letter-spacing:.08em;text-transform:uppercase;font-size:.74rem;font-weight:900}.concealed-problem strong{color:var(--navy);font-size:1.08rem}.concealed-problem button{color:#fff;background:var(--blue);cursor:pointer;white-space:nowrap;border:0;border-radius:10px;min-height:46px;padding:0 17px;font-weight:900}.concealed-problem button:disabled{opacity:.45;cursor:not-allowed}.problem-timer{font-variant-numeric:tabular-nums;border-radius:7px;margin:9px 0 0 12px;padding:5px 8px;font-weight:900;display:inline-flex}.problem-timer.running{color:#9a4f00;background:#fff0da}.problem-timer.stopped{color:#086448;background:#dff5eb}.attempt-count{color:var(--muted);margin:12px 0 0;font-size:.83rem;font-weight:750}.reset-button:disabled{cursor:not-allowed;opacity:.55}.report-page{background:#f2f5f8;min-height:100vh}.report-hero{color:#fff;background:linear-gradient(135deg,#10243d,#173657);padding:0 max(24px,50vw - 590px)}.report-heading{justify-content:space-between;align-items:flex-end;gap:30px;padding:56px 0 48px;display:flex}.report-heading h1{letter-spacing:-.055em;margin:6px 0 12px;font-size:clamp(2.8rem,6vw,5rem);line-height:.96}.report-heading p:last-child{color:#cdd9e6;max-width:700px;margin:0;line-height:1.6}.report-heading .report-set-title{color:#70d5c7;letter-spacing:.05em;text-transform:uppercase;margin:-4px 0 10px;font-size:.82rem;font-weight:850}.report-status{white-space:nowrap;border-radius:99px;padding:9px 12px;font-size:.8rem;font-weight:900}.report-status.active{color:#ffe3bd;background:#a85d0a52}.report-status.finished{color:#bdf4de;background:#087b5959}.report-content{max-width:1180px;margin:0 auto;padding:38px 24px 72px}.report-summary{grid-template-columns:repeat(6,1fr);gap:12px;display:grid}.report-summary article{background:#fff;border:1px solid #d5dee9;border-radius:13px;padding:18px}.report-summary span{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px;font-size:.77rem;font-weight:850;display:block}.report-summary strong{color:var(--navy);font-size:2rem}.report-summary small{color:#8a97a8;font-size:.9rem}.report-times{color:var(--muted);background:#fff;border:1px solid #d5dee9;border-radius:11px;flex-wrap:wrap;gap:10px 24px;margin:18px 0;padding:15px 18px;font-size:.85rem;display:flex}.report-table-wrap{background:#fff;border:1px solid #d5dee9;border-radius:14px;overflow-x:auto}.report-table{border-collapse:collapse;width:100%;min-width:1020px}.report-table th{color:#536176;text-align:left;text-transform:uppercase;letter-spacing:.05em;background:#eef3f8;padding:12px 11px;font-size:.72rem}.report-table td{color:#334056;vertical-align:middle;border-top:1px solid #e0e6ee;padding:13px 11px;font-size:.86rem}.report-table td:nth-child(2){min-width:420px}.report-table td:nth-child(2) strong{color:var(--navy);margin:5px 0 3px;display:block}.report-table td:nth-child(2) small{color:#8491a2}.report-problem-statement{color:#465469;max-width:620px;margin:8px 0;font-size:.82rem;line-height:1.48}.report-level{text-transform:uppercase;border-radius:5px;padding:3px 6px;font-size:.64rem;font-weight:900;display:inline-block}.report-level.easy{color:#086448;background:#dff5eb}.report-level.medium{color:#1655a2;background:#e4efff}.report-level.hard{color:#965000;background:#fff0da}.report-result{white-space:nowrap;border-radius:7px;padding:5px 7px;font-weight:850;display:inline-block}.report-result.correct{color:#086448;background:#dff5eb}.report-result.wrong{color:#965000;background:#fff0da}.report-result.idle{color:#1655a2;background:#e4efff}.report-result.not-started{color:#66748a;background:#edf1f5}.report-answer{overflow-wrap:anywhere;max-width:190px}.report-loading,.report-error{background:#fff;border:1px solid #d5dee9;border-radius:15px;max-width:680px;margin:18vh auto;padding:28px}.setup-card{background:#fff;border:1px solid #d5dee9;border-radius:18px;max-width:900px;margin:40px auto 80px;padding:28px;box-shadow:0 16px 42px #11264012}.setup-name{color:var(--navy);gap:8px;font-weight:850;display:grid}.setup-name input{border:1px solid #cbd6e3;border-radius:10px;min-height:50px;padding:0 14px}.setup-success{align-items:center;gap:13px;margin-bottom:22px;display:flex}.setup-success>span{color:#fff;background:#15966d;border-radius:50%;place-items:center;width:40px;height:40px;font-weight:900;display:grid}.setup-success strong{color:var(--navy);font-size:1.2rem}.setup-success p,.setup-note{color:var(--muted);margin:4px 0 0}.setup-link-row{background:#f7f9fc;border:1px solid #ccd8e5;border-radius:12px;grid-template-columns:1fr auto;align-items:center;gap:15px;margin:12px 0;padding:17px;display:grid}.setup-link-row.teacher{background:#f0faf6;border-color:#9ecdbb}.setup-link-row div{min-width:0}.setup-link-row span{color:var(--teal);letter-spacing:.07em;text-transform:uppercase;margin-bottom:7px;font-size:.72rem;font-weight:900;display:block}.setup-link-row code{color:#42516a;text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.setup-link-row button{color:#fff;background:var(--blue);cursor:pointer;border:0;border-radius:9px;min-height:42px;padding:0 14px;font-weight:850}.setup-link-row.teacher button{background:#137e60}.setup-note{margin:18px 0;line-height:1.55}@media (width<=760px){.timed-start-wrap{padding:44px 0 60px}.timed-warning{padding:18px}.attempt-banner,.concealed-problem,.report-heading{flex-direction:column;align-items:stretch}.attempt-banner{margin:18px 14px -18px}.attempt-banner>div{flex-direction:column;align-items:flex-start}.concealed-problem{padding:22px}.concealed-problem button{width:100%}.problem-timer{margin-left:0}.report-hero{padding-inline:17px}.report-heading{padding:40px 0 35px}.report-content{padding:24px 14px 52px}.report-summary{grid-template-columns:1fr 1fr}.setup-card{margin:20px 14px 55px;padding:18px}.setup-link-row{grid-template-columns:1fr}}@media print{.report-hero .topbar,.report-status{display:none}.report-hero,.report-page{color:#111;background:#fff}.report-heading{padding:18px 0}.report-heading p:last-child{color:#333}.report-content{padding:12px 0}}
