@import"https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;650;700;750;800&display=swap";:root{--ink:#233b36;--muted:#66766e;--green:#21594f;--cream:#faf9f4;--line:#dce2d9;--mint:#e5eee3;--yellow:#f3ce65;--coral:#dca88e;--blue:#dfe9ef;--radius:20px;font-family:DM Sans,sans-serif;color:var(--ink);background:var(--cream);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:default}a{color:inherit}button{border:0;background:none}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:Manrope,sans-serif}h1{font-size:clamp(36px,4.3vw,62px);letter-spacing:-2.8px;line-height:1.12;margin-bottom:20px}h2{font-size:30px;line-height:1.25;letter-spacing:-1px}h3{font-size:18px;line-height:1.4;letter-spacing:-.35px}p{line-height:1.75}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #b16c27;outline-offset:4px}button:disabled{opacity:.65}.skip{position:fixed;top:-80px;left:20px;background:#fff;padding:15px;z-index:100}.skip:focus{top:10px}.header{height:104px;border-bottom:1px solid var(--line);padding:0 5.5%;display:flex;align-items:center;gap:40px;background:var(--cream)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:15px;line-height:1.3;letter-spacing:-.3px}.brand b{font-weight:700}.brand-mark{width:45px;height:45px;background:var(--green);color:#fff;display:inline-flex;justify-content:center;align-items:center;border-radius:14px}.nav{display:flex;align-items:center;gap:24px;margin:auto}.nav button{display:flex;align-items:center;gap:5px;font-size:13px;padding:12px 0}.nav button:hover,.nav .active{color:var(--green);text-decoration:underline;text-underline-offset:7px}.header-right{display:flex;gap:20px;align-items:center}.version{font-size:10px;border:1px solid #c9d4c8;padding:6px 9px;border-radius:30px;text-transform:uppercase;letter-spacing:.7px}.login{display:flex;gap:7px;align-items:center;font-size:13px;font-weight:700}.mobile-menu{display:none}.hero{padding:76px 8% 80px;display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center;max-width:1500px;margin:auto}.eyebrow{font-size:10px;letter-spacing:1.7px;font-weight:700;display:inline-flex;gap:8px;align-items:center;margin-bottom:20px}.eyebrow>span{height:6px;width:6px;border-radius:50%;background:var(--green)}.hero h1{font-size:clamp(50px,5.8vw,84px);letter-spacing:-4.5px;line-height:1.06;margin:0 0 28px}.hero h1 em{font-style:normal;position:relative;z-index:0}.hero h1 em:after{content:"";position:absolute;height:12px;background:var(--yellow);left:0;right:0;bottom:6px;z-index:-1;transform:rotate(-2deg)}.hero-copy>p{max-width:460px;color:var(--muted);font-size:16px;line-height:1.9;margin-bottom:30px}.hero-buttons{display:flex;align-items:center;gap:22px}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:14px;padding:16px 23px;border-radius:9px;text-decoration:none;font-size:13px;font-weight:600;background:var(--green);color:#fff;line-height:1.4;min-height:46px}.primary:hover{background:#17463e}.secondary{background:#fff;border:1px solid #cbd5cb;color:var(--ink)}.text-button{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;padding:10px 0}.hero-meta{display:flex;gap:22px;font-size:10px;color:var(--muted);margin-top:29px}.hero-meta>span{display:flex;gap:6px;align-items:center}.hero-art{background:var(--mint);border:1px solid #d4dfd1;border-radius:24px;min-height:410px;padding:29px 35px 42px;position:relative;max-width:440px;width:100%;justify-self:end;transform:rotate(1deg)}.art-top{display:flex;justify-content:space-between;align-items:center}.mini-label{font-size:10px;letter-spacing:1.8px;font-weight:700}.dot-grid{font-size:35px;color:var(--green)}.art-equation{display:flex;justify-content:center;gap:30px;align-items:center;padding:10px 0 25px}.large-fraction{font-family:Georgia,serif;font-size:55px;display:flex;flex-direction:column;align-items:center;line-height:1.15}.large-fraction b{font-weight:400;padding:0 7px}.large-fraction b:first-child{border-bottom:2px solid var(--green)}.equals{font-size:36px;font-weight:400}.circle-fraction{width:132px;height:132px;border-radius:50%;background:conic-gradient(from 0deg,var(--green) 0 75%,#f9f9f1 75%);border:1px solid #b7c6b5;position:relative}.circle-fraction:before,.circle-fraction:after{content:"";position:absolute;background:var(--mint);width:100%;height:2px;top:50%}.circle-fraction:after{transform:rotate(90deg)}.hero-art h2{font-size:24px;letter-spacing:-.7px;line-height:1.3;margin-bottom:24px}.fraction-bar{display:flex;gap:4px;width:100%;height:32px}.fraction-bar span{background:#f6f8ef;border:1px solid #bdccba;flex:1;border-radius:3px}.fraction-bar .filled{background:var(--green);border-color:var(--green)}.art-caption{display:flex;justify-content:space-between;margin-top:8px;font-size:10px;color:var(--muted)}.floating-card{position:absolute;bottom:-20px;right:-24px;display:flex;gap:12px;align-items:center;background:#fffef8;box-shadow:0 10px 35px #22352b15;border:1px solid #e3e4d8;border-radius:12px;padding:15px 22px;font-size:11px;line-height:1.6;transform:rotate(-3deg)}.floating-icon{display:flex;align-items:center;justify-content:center;background:var(--yellow);width:34px;height:34px;border-radius:50%}.four-section{padding:48px 8% 60px;border-top:1px solid var(--line);max-width:1500px;margin:auto}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:30px}.section-heading .eyebrow{margin-bottom:11px}.section-heading h2{margin:0}.section-heading>p{font-size:12px;color:var(--muted);margin-bottom:2px}.four-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.path-card{text-align:left;border:1px solid #dbe1d7;padding:22px;border-radius:14px;transition:transform .15s}.path-card:hover{transform:translateY(-5px)}.path-0{background:#eaf0e4}.path-1{background:#f6efdb}.path-2{background:#e6edf0}.path-3{background:#f3e7df}.path-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.path-top>span{font-size:10px;opacity:.6}.path-card h3{margin-bottom:10px}.path-card p{font-size:12px;line-height:1.8;color:#5c6c64;min-height:65px}.path-card>svg{margin-top:5px}.sample-banner{margin:0 8% 30px;padding:32px 38px;display:flex;justify-content:space-between;gap:24px;align-items:center;border:1px solid #d9e1d5;border-radius:16px;background:#f0f3e9}.sample-banner .eyebrow{margin-bottom:10px}.sample-banner h2{font-size:26px;margin-bottom:10px}.sample-banner p{font-size:12px;margin:0;color:var(--muted)}.development-note{font-size:11px;color:var(--muted);text-align:center;padding:0 25px 25px}.page-section{max-width:1230px;margin:0 auto;padding:52px 5% 80px;min-height:65vh}.lead{font-size:16px;color:var(--muted);max-width:750px;margin-bottom:40px}.stage-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}.stage-grid h2{font-size:23px}.course-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.course-card{text-align:left;position:relative;border:1px solid var(--line);border-radius:15px;padding:24px;background:#fff}.course-card:hover{border-color:var(--green)}.course-card.selected{background:#edf2e7}.course-card h3{margin:20px 0 5px}.course-card p{font-size:12px;color:var(--muted);margin-bottom:15px}.course-card>svg:last-child{position:absolute;right:20px;bottom:22px}.available,.muted{font-size:10px;border-radius:4px;padding:5px 8px;display:inline-block}.available{color:#21594f;background:#dfeddf}.muted{color:#6c766e;background:#f0f0e9}.back{display:flex;align-items:center;gap:7px;font-size:12px;margin-bottom:32px;padding:0}.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.subject-card{text-align:left;padding:25px;border:1px solid var(--line);border-radius:14px;background:#fff;position:relative}.subject-card:disabled{background:#f6f6f0;opacity:.8}.subject-icon{width:45px;height:45px;display:flex;align-items:center;justify-content:center;border-radius:12px;margin-bottom:20px}.s0{background:#e1ece1}.s1{background:#f3e9cf}.s2{background:#e2eaf1}.s3{background:#f2e2da}.subject-card h3{font-size:16px;min-height:45px}.subject-card>svg{position:absolute;right:20px;bottom:26px}.topic-list{display:grid;gap:13px}.topic-list>button{display:flex;text-align:left;align-items:center;gap:25px;border:1px solid var(--line);padding:20px 26px;border-radius:12px;background:#fff}.topic-list>button:disabled{background:#f3f4ed}.topic-number{font-size:22px;color:var(--muted)}.topic-list h3{margin:0 0 3px}.topic-list p{font-size:12px;color:var(--muted);margin:0}.topic-list>button>svg{margin-left:auto}.unit-heading{padding:28px 8% 0;border-bottom:1px solid var(--line);background:#eef2e8}.breadcrumb{display:flex;align-items:center;gap:9px;font-size:10px;color:var(--muted);margin-bottom:32px}.breadcrumb button{padding:0;font-size:11px}.unit-title{display:flex;justify-content:space-between;align-items:center}.unit-title h1{font-size:42px;letter-spacing:-1.8px;margin-bottom:13px}.unit-title p{font-size:14px;color:var(--muted);margin-bottom:30px}.unit-title .eyebrow{margin-bottom:12px}.session-label{font-size:11px;display:flex;gap:6px;align-items:center;white-space:nowrap}.tab-bar{display:flex;gap:14px;margin-top:10px}.tab-bar button{display:flex;align-items:center;gap:9px;padding:19px 23px;border-bottom:3px solid transparent;font-size:13px;color:var(--muted)}.tab-bar button.selected{border-color:var(--green);color:var(--green);font-weight:700}.unit-body{max-width:1300px;margin:auto;padding:25px 5% 60px}.download-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:34px;font-size:11px;color:var(--muted)}.download-row>div{display:flex;gap:9px}.download-row a{display:flex;gap:6px;align-items:center;text-decoration:none;border:1px solid #d3dbd0;padding:9px 13px;border-radius:7px;background:#fff;color:var(--ink)}.lesson-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:55px}.lesson-index{align-self:start;position:sticky;top:20px}.lesson-index .eyebrow{font-size:9px;margin-bottom:14px}.lesson-index>button{display:flex;text-align:left;gap:11px;width:100%;padding:12px;border-radius:6px;font-size:12px;color:var(--muted);line-height:1.45}.lesson-index>button>span{font-size:9px;min-width:15px;padding-top:3px;opacity:.7}.lesson-index>button.selected{background:#e6ede1;color:var(--green);font-weight:600}.lesson-kicker{font-size:10px;letter-spacing:1.4px;color:var(--muted);margin-bottom:15px}.lesson-content h2{font-size:30px;margin-bottom:20px}.lesson-content>p{font-size:14px;line-height:1.95;color:#42554d;margin-bottom:20px}.lesson-content .lesson-intro{font-size:17px;color:var(--ink);line-height:1.85}.fraction-demo{padding:24px;background:#edf1e7;border-radius:14px;display:flex;gap:30px;align-items:center;margin-bottom:26px}.demo-value{font-size:40px;font-family:Georgia,serif;min-width:65px}.fraction-demo>div:last-child{flex:1}.fraction-demo p{font-size:10px;color:var(--muted);margin:8px 0 0}.video-link{display:flex;gap:9px;align-items:center;font-size:10px;text-decoration:none;border-top:1px solid var(--line);padding-top:20px;margin-top:20px}.video-link small{font-size:9px;color:var(--muted)}.small-note{font-size:10px;line-height:1.7;color:var(--muted);margin-top:15px}.example-box{padding:26px;border-radius:14px;background:#f4ecd4;border:1px solid #e5dabb;margin-top:30px}.example-box .eyebrow{font-size:9px;margin-bottom:13px}.example-box p{font-size:14px;font-weight:500}.example-box ol{padding-left:20px;font-size:13px;line-height:1.9;margin-bottom:0}.error-box{padding:20px 23px;border-radius:10px;background:#f6e9e2;border-left:3px solid #bd8d72;margin:24px 0}.error-box strong{font-size:12px}.error-box p{font-size:12px;margin:7px 0 0;line-height:1.8}.lesson-next{display:flex;justify-content:space-between;gap:20px;margin-top:28px}.sources{margin-top:45px;padding:22px 0;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.sources summary{cursor:pointer}.sources ul{line-height:1.9}.summary-intro{max-width:700px;margin-bottom:34px}.summary-intro p{color:var(--muted);font-size:14px}.summary-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.summary-card{border:1px solid var(--line);border-radius:15px;padding:25px;background:#fff}.index-badge{display:inline-flex;width:30px;height:30px;align-items:center;justify-content:center;border-radius:50%;background:#e5eddd;font-size:12px;margin-bottom:15px}.summary-card p{font-size:13px}.summary-example{padding:14px;border-radius:8px;background:#f6f5ed;font-size:12px;line-height:1.8;margin:18px 0 5px}.remember{background:#e8eee1;border:1px solid #d7e1ce;padding:25px 30px;border-radius:14px;margin:28px 0}.remember p{font-size:13px;margin:10px 0 0}.remember h3{margin:0}.concept-map{border-radius:20px;background:#fffef9;border:1px solid var(--line);padding:35px}.map-header{text-align:center;margin-bottom:30px}.map-header .eyebrow{margin-bottom:12px}.map-header h2{font-size:28px;margin-bottom:12px}.map-header p{font-size:12px;color:var(--muted)}.map-root{max-width:350px;margin:auto;background:var(--green);color:#fff;border-radius:17px;text-align:center;padding:23px 30px}.map-root>span{font-size:10px;letter-spacing:2px;display:block}.map-root>strong{font-family:Georgia,serif;font-size:45px;font-weight:400;display:block;margin:10px 0}.map-root>p{font-size:11px}.map-root .fraction-bar{height:23px}.map-root .fraction-bar .filled{background:var(--yellow);border-color:var(--yellow)}.map-connector{text-align:center;font-size:10px;color:var(--muted);padding:23px 0;position:relative}.map-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.map-node{border-radius:12px;background:#eaf0e3;padding:22px;border-top:3px solid #7f9b78}.map-node-1,.map-node-4{background:#f6eed9;border-color:#c2a65f}.map-node-2,.map-node-5{background:#e8eff2;border-color:#849eaa}.node-number{font-size:9px;letter-spacing:1px;opacity:.65}.map-node h3{font-size:17px;margin:8px 0 12px}.map-node>p{font-size:12px;line-height:1.8}.map-node>div{font-family:Manrope,sans-serif;font-size:14px;font-weight:700;background:#ffffff8c;padding:12px;border-radius:7px;line-height:1.8;margin-bottom:12px}.map-node small{font-size:10px;line-height:1.7;display:block;color:#52675c}.map-bottom{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;border:1px dashed #bbcbb4;border-radius:12px;padding:23px;margin-top:24px}.map-bottom h3{font-size:13px}.map-bottom p{font-size:16px;font-weight:600;line-height:1.5;margin-bottom:10px}.map-bottom span{font-size:10px;line-height:1.7;color:var(--muted)}.practice-heading{display:flex;gap:30px;justify-content:space-between;align-items:center}.practice-heading>div:first-child{max-width:680px}.practice-heading h2{margin-bottom:14px}.practice-heading p{font-size:13px;color:var(--muted)}.practice-score{text-align:center;min-width:130px;background:#e8eee0;border-radius:15px;padding:20px}.practice-score strong{font-size:35px;display:block}.practice-score small{font-size:17px;color:var(--muted);font-weight:400}.practice-score span{font-size:9px}.practice-modes{display:flex;gap:7px;margin:26px 0;background:#eceee5;padding:5px;border-radius:10px;width:fit-content}.practice-modes button{padding:12px 18px;font-size:12px;border-radius:7px}.practice-modes .selected{background:#fff;box-shadow:0 2px 6px #00000008;font-weight:700}.filters{display:flex;gap:18px;align-items:flex-end;background:#f2f3ec;border:1px solid var(--line);border-radius:11px;padding:20px;margin-bottom:25px}label{font-size:11px;display:block}select,input{display:block;margin-top:7px;border:1px solid #cdd7c9;border-radius:7px;padding:12px;background:#fff;color:var(--ink);max-width:100%}select{font-size:12px}.filters select{max-width:320px}.activity-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.activity-card{border:1px solid #dce2d5;border-radius:13px;padding:23px;background:#fff;align-self:start}.activity-meta{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:18px;font-size:9px;letter-spacing:.8px;color:var(--muted)}.level{padding:5px 7px;border-radius:4px;font-size:9px;letter-spacing:0;background:#e7efdf;color:#46623c}.level-2{background:#f7edce;color:#78602d}.level-3{background:#e7eaf4;color:#535b80}.activity-card h3{font-size:14px;line-height:1.7;min-height:48px;font-family:DM Sans,sans-serif;font-weight:500}.answer-row{display:flex;gap:8px;align-items:stretch}.answer-row input{flex:1;width:100%;margin:0;padding:12px;font-size:13px}.answer-row button{padding:8px 13px;background:var(--green);color:#fff;border-radius:7px}.answer-row button:disabled{opacity:.35}.feedback{border-top:1px solid var(--line);margin-top:17px;padding-top:17px;font-size:12px}.feedback p{font-size:12px;margin:8px 0 0}.correct{border-color:#8eac80;background:#fcfef9}.incorrect{border-color:#d1a187}.exam-note{background:#f5ecd6;border-radius:10px;padding:20px;font-size:13px;margin-bottom:25px;line-height:1.8}.exam-submit{margin-top:25px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:30px}.stat-card strong{display:block;font-size:45px;font-family:Manrope,sans-serif}.stat-card span{font-size:12px;color:var(--muted)}.progress-panel{padding:30px;border:1px solid var(--line);background:#edf2e7;border-radius:15px;margin-top:25px}.progress-panel h2{font-size:23px}.progress-panel p{font-size:13px}.progress-panel progress{width:100%;height:11px;accent-color:var(--green);margin-bottom:15px}.history-list{margin:30px 0}.history-list>div{display:flex;align-items:center;gap:17px;padding:15px 0;border-bottom:1px solid var(--line);font-size:12px}.history-list p{font-size:11px;color:var(--muted);margin:4px 0}.result-ok{color:#3e794c}.result-no{color:#a4743c}.teacher-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.teacher-feature{border:1px solid var(--line);padding:30px;border-radius:17px;background:#fff}.teacher-feature>svg{color:var(--green);margin-bottom:25px}.teacher-feature h2{font-size:23px}.teacher-feature p{font-size:13px;color:var(--muted)}.future{background:#f3f4ed}footer{display:flex;gap:30px;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding:30px 5.5%;font-size:10px;color:var(--muted)}footer p{margin:0}.footer-brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-size:11px}.toast{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:#244b40;color:#fff;padding:18px 24px;box-shadow:0 10px 40px #0002;border-radius:12px;z-index:110;max-width:90%;font-size:13px;display:flex;align-items:center;gap:20px}.toast button{color:#fff}.modal-overlay{position:fixed;inset:0;background:#1f312e66;z-index:120;display:flex;align-items:center;justify-content:center;padding:25px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.auth-dialog{position:relative;background:var(--cream);padding:40px;border-radius:20px;max-width:450px;width:100%;max-height:92vh;overflow:auto;box-shadow:0 20px 70px #0002}.auth-dialog h2{font-size:26px;margin:25px 0 18px}.auth-dialog p{font-size:13px;color:var(--muted)}.close-dialog{position:absolute;top:20px;right:17px}.auth-dialog label{margin-bottom:17px}.auth-dialog input,.auth-dialog select,.auth-dialog .primary{width:100%}.checkbox{display:flex;gap:10px;align-items:flex-start;line-height:1.6}.checkbox input{width:16px;margin-top:2px;flex-shrink:0}@media(min-width:1500px){.sample-banner{max-width:1260px;margin-left:auto;margin-right:auto}}@media(max-width:1000px){.header{gap:20px;padding:0 4%}.nav{gap:15px}.version{display:none}.hero{padding:65px 6%;gap:35px}.hero h1{font-size:60px}.hero-meta{flex-direction:column;gap:8px}.hero-art{min-height:390px;padding:25px}.floating-card{right:-10px}.four-section{padding:40px 6%}.four-grid{gap:12px}.path-card{padding:18px}.section-heading>p{display:none}.lesson-layout{grid-template-columns:210px minmax(0,1fr);gap:30px}.map-grid{grid-template-columns:1fr 1fr}.map-bottom{grid-template-columns:1fr}.filters{flex-wrap:wrap}.tab-bar button{padding:18px 12px}.unit-title h1{font-size:35px}.summary-card{padding:20px}.hero-buttons{gap:15px}.hero-buttons .primary{padding:15px}.hero-art h2{font-size:21px}}@media(max-width:700px){h1{letter-spacing:-1.6px}.header{height:82px;padding:0 5%;gap:12px}.brand{font-size:12px}.brand-mark{width:37px;height:37px}.header-right{margin-left:auto;gap:15px}.mobile-menu{display:block;padding:0}.login{font-size:11px}.nav{display:none}.nav.open{display:flex;position:absolute;top:82px;left:0;right:0;padding:20px 6%;background:var(--cream);border-bottom:1px solid var(--line);z-index:50;flex-direction:column;align-items:flex-start}.hero{grid-template-columns:1fr;padding:42px 7% 60px;gap:40px}.hero h1{font-size:58px;letter-spacing:-3px}.hero-copy>p{font-size:14px;max-width:100%}.hero-buttons{gap:20px}.hero-meta{flex-direction:row;flex-wrap:wrap;font-size:9px;gap:16px}.hero-art{justify-self:center;max-width:370px;min-height:385px;padding:25px 30px}.art-equation{padding-top:0}.hero-art h2{font-size:24px}.four-section{padding:35px 6%}.section-heading h2{font-size:24px}.four-grid{grid-template-columns:1fr 1fr}.path-card{padding:20px}.path-card h3{font-size:16px}.path-card p{font-size:11px;min-height:75px}.path-top{margin-bottom:22px}.sample-banner{margin:0 6% 25px;padding:24px;align-items:flex-start;flex-direction:column}.sample-banner h2{font-size:23px}.development-note{font-size:10px}.page-section{padding:35px 6% 50px}.stage-grid{grid-template-columns:1fr}.course-card{padding:20px}.lead{font-size:14px;margin-bottom:28px}.subject-grid{grid-template-columns:1fr 1fr;gap:12px}.subject-card{padding:18px}.subject-card h3{font-size:13px;min-height:55px}.subject-card .muted,.subject-card .available{font-size:8px}.subject-card>svg{display:none}.topic-list>button{gap:16px;padding:17px}.topic-list h3{font-size:14px}.topic-number{font-size:19px}.unit-heading{padding:22px 6% 0}.breadcrumb{margin-bottom:25px}.unit-title h1{font-size:32px;line-height:1.2}.unit-title p{font-size:12px}.unit-title .eyebrow{font-size:8px;letter-spacing:1px}.session-label{display:none}.tab-bar{gap:0;justify-content:space-between;overflow-x:auto}.tab-bar button{font-size:10px;gap:5px;padding:15px 7px;white-space:nowrap}.tab-bar svg{width:16px}.unit-body{padding:20px 6% 40px}.download-row{font-size:9px;align-items:flex-start;gap:15px}.download-row>span{max-width:140px;line-height:1.6}.download-row a{font-size:10px;padding:8px}.lesson-layout{grid-template-columns:1fr;gap:25px}.lesson-index{position:static;display:flex;overflow-x:auto;gap:5px;align-items:center;border-bottom:1px solid var(--line);padding-bottom:15px}.lesson-index>.eyebrow,.lesson-index>.video-link,.lesson-index>.small-note{display:none}.lesson-index>button{min-width:150px;max-width:180px;min-height:62px;font-size:10px}.lesson-content h2{font-size:25px}.lesson-content .lesson-intro{font-size:15px}.lesson-content>p{font-size:13px}.lesson-next{flex-direction:column;gap:10px;align-items:flex-start}.summary-grid{grid-template-columns:1fr}.summary-intro h2{font-size:25px}.concept-map{padding:20px 16px}.map-header h2{font-size:23px}.map-grid{grid-template-columns:1fr}.map-node{padding:20px}.map-bottom{padding:18px}.practice-heading{align-items:flex-start;gap:15px}.practice-heading h2{font-size:24px}.practice-heading p{font-size:12px}.practice-score{min-width:80px;padding:15px 10px}.practice-score strong{font-size:25px}.practice-score small{font-size:13px}.practice-score span{font-size:8px;line-height:1.5;display:block}.practice-modes button{font-size:10px;padding:12px}.filters{padding:15px;gap:12px}.filters label{width:100%}.filters select{width:100%;max-width:100%}.activity-grid{grid-template-columns:1fr}.activity-card h3{min-height:0;font-size:14px}.stats-grid{gap:10px}.stat-card{padding:18px 13px}.stat-card strong{font-size:30px}.stat-card span{font-size:10px;line-height:1.6}.teacher-grid{grid-template-columns:1fr}.teacher-feature{padding:25px}.teacher-feature h2{font-size:21px}footer{flex-direction:column;align-items:flex-start;gap:14px;padding:25px 6%}.auth-dialog{padding:30px 25px}.eyebrow{font-size:9px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{.header,footer,.download-row,.tab-bar,.lesson-index,.toast,.back{display:none!important}body{background:#fff}.unit-body{padding:0}.lesson-layout{display:block}.map-grid,.summary-grid{break-inside:auto}.activity-card,.summary-card,.map-node{break-inside:avoid}}:root{--ink:#252743;--muted:#73778e;--green:#6154ce;--cream:#f7f8fd;--line:#e6e7f1;--mint:#eeecff;--yellow:#ffce64}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.app-v2{min-height:100vh;background:var(--cream)}.workspace-header{height:86px;display:flex;align-items:center;padding:0 5%;background:#fff;border-bottom:1px solid var(--line);gap:45px}.workspace-header .brand{font-family:Manrope,sans-serif;font-size:21px;font-weight:800;letter-spacing:-.6px;min-width:180px}.workspace-header .brand-mark{width:44px;height:44px;background:#7061db;border-radius:15px;box-shadow:0 4px #e9e5ff}.brand-caption{display:block;font-family:DM Sans,sans-serif;font-size:9px;font-weight:400;letter-spacing:.15px;color:var(--muted);margin-top:3px}.workspace-header>.login{margin-left:auto;font-weight:500;font-size:12px}.header-course{display:flex;align-items:center;gap:22px;margin:auto}.header-course>span{font-size:11px;color:var(--muted)}.course-switch{position:relative}.course-switch select{appearance:none;font-weight:700;font-size:12px;border:0;border-radius:8px;background:#f4f3fd;cursor:pointer;padding:11px 34px 11px 14px;margin:0;min-width:147px}.course-switch>svg{position:absolute;top:12px;right:11px;pointer-events:none}.account-actions{position:relative;display:flex;align-items:center;gap:17px}.demo-pill{font-size:9px;color:#8075a1;letter-spacing:.2px}.account-button{display:flex;align-items:center;justify-content:center;width:39px;height:39px;border-radius:50%;background:#eeebfc;color:#6c5cbe}.account-menu{position:absolute;top:52px;right:0;width:220px;background:#fff;border:1px solid var(--line);padding:18px;border-radius:13px;box-shadow:0 8px 24px #37356915;z-index:40}.account-menu strong{display:block;font-size:12px;padding-bottom:13px;border-bottom:1px solid var(--line)}.account-menu button{display:flex;align-items:center;gap:8px;font-size:12px;padding:14px 0 0}.workspace-nav{display:flex;justify-content:center;gap:36px;border-bottom:1px solid var(--line);background:#fff;padding:0 5%}.workspace-nav>button{display:flex;align-items:center;gap:9px;padding:19px 8px;border-bottom:3px solid transparent;font-size:12px;color:#7e8096}.workspace-nav>button.selected{color:#6251c8;border-color:#7663df;font-weight:700}.favorite-count{display:flex;width:17px;height:17px;align-items:center;justify-content:center;background:#ece8ff;border-radius:50%;font-size:9px;margin-left:2px}.app-v2 .primary{background:#6b58d7;border-radius:11px;font-size:12px;min-height:46px;padding:14px 20px;box-shadow:0 4px #e7e1ff}.app-v2 .primary:hover{background:#5a46c5}.app-v2 .secondary{border-radius:10px;font-size:12px;color:var(--ink)}.app-v2 .text-button{color:#6253bc}.access-panel{position:relative;text-align:center;max-width:680px;padding:50px 30px 40px;margin:0 auto;min-height:calc(100vh - 150px)}.access-panel>.eyebrow{margin-bottom:15px;letter-spacing:1.7px;font-size:9px;color:#8c80bc}.access-panel>h1{font-size:43px;letter-spacing:-1.8px;margin-bottom:13px}.access-intro{font-size:13px;color:var(--muted);margin-bottom:31px}.access-card{max-width:450px;margin:auto;background:#fff;border:1px solid #e7e6f1;border-radius:23px;padding:28px 30px;box-shadow:0 9px 32px #50439206}.access-card>h2{font-size:17px;font-weight:700;letter-spacing:-.4px;text-align:left;margin-bottom:22px}.role-options{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin-bottom:25px}.role-options>button{position:relative;text-align:center;border:2px solid transparent;border-radius:15px;background:#f5f3ff;padding:22px 12px 20px;transition:border-color .15s,transform .15s}.role-options>.teacher{background:#fff6e7}.role-options>button:hover{transform:translateY(-2px)}.role-options>.selected{border-color:#8c76e6}.role-options>.teacher.selected{border-color:#e8b14e}.role-options>button>span{width:57px;height:57px;background:#e7e0ff;color:#7357c8;display:flex;align-items:center;justify-content:center;border-radius:18px;margin:0 auto 14px}.role-options>.teacher>span{background:#ffe7b7;color:#ba791c}.role-options>button>strong{display:block;font-size:14px;letter-spacing:-.2px}.role-options>button>small{display:block;font-size:10px;color:var(--muted);margin-top:6px}.role-options>button>svg{position:absolute;top:10px;right:9px;color:#856cd6}.role-options>.teacher>svg{color:#c28b2c}.entry-course{text-align:left;font-size:12px;font-weight:500}.entry-course select{font-size:13px;padding:13px 14px;width:100%;border-color:#e1e0ef;background:#fbfbfe}.enter-workspace{margin-top:23px;width:100%}.access-note{font-size:10px;line-height:1.7;color:#8a8ca1;margin:17px 8px 0}.preview-link{justify-content:center;margin:13px auto 0}.access-bottom{font-size:10px;color:#9294a7;margin:25px 0 0}.access-decoration{position:absolute;inset:0;pointer-events:none}.access-decoration>span{position:absolute;display:flex;align-items:center;justify-content:center;width:43px;height:43px;border-radius:14px;background:#e4f7f0;color:#50a586;transform:rotate(-12deg);left:-34px;top:150px}.access-decoration>span:nth-child(2){background:#ffecda;color:#da9b68;left:auto;right:-30px;top:290px;transform:rotate(13deg)}.access-decoration>span:nth-child(3){background:#e9e4ff;color:#9b8ad7;top:480px;left:-5px;transform:rotate(10deg)}.simple-workspace{max-width:1160px;margin:0 auto;padding:40px 5% 55px;min-height:calc(100vh - 210px)}.workspace-welcome{position:relative;display:flex;justify-content:space-between;align-items:center;padding:30px 34px;border-radius:21px;background:#eeebff;overflow:hidden;margin-bottom:35px}.workspace-welcome .eyebrow{font-size:8px;color:#8a7cba;letter-spacing:1.5px;margin-bottom:12px}.workspace-welcome h1{font-size:30px;font-weight:800;letter-spacing:-1.2px;margin:0 0 10px}.workspace-welcome h1>span{font-weight:500;color:#6e60b7;display:inline-block;margin-left:15px}.workspace-welcome p{font-size:12px;color:#81759f;margin:0}.welcome-art{position:relative;display:flex;align-items:center;justify-content:center;gap:23px;color:#8d78d3;padding-right:18px;transform:rotate(-8deg)}.welcome-art>svg{background:#dbd2ff;padding:13px;border-radius:20px;width:78px;height:78px}.welcome-art>span:first-child{font-size:32px;color:#b1a0e9}.welcome-art>span:last-child{font-size:33px;color:#e5b856;align-self:flex-start}.workspace-section-title{display:flex;align-items:center;justify-content:space-between;margin:0 2px 20px}.workspace-section-title h2{font-size:19px;letter-spacing:-.5px;margin:0}.workspace-section-title>span{font-size:10px;color:#9395a7}.color-subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:17px}.color-subject{position:relative;overflow:hidden;min-height:184px;display:flex;flex-direction:column;align-items:flex-start;text-align:left;padding:23px 22px 18px;border-radius:17px;border:1px solid transparent;transition:transform .15s,box-shadow .15s;background:var(--card-bg);color:var(--card-ink);opacity:1}.color-subject:hover{transform:translateY(-4px);box-shadow:0 7px 22px #37356310}.color-0{--card-bg:#eee8ff;--card-ink:#7151bc;--card-icon:#e0d4ff}.color-1{--card-bg:#e1efff;--card-ink:#4d85bd;--card-icon:#cee4ff}.color-2{--card-bg:#e1f4e9;--card-ink:#4e9d7d;--card-icon:#ccebdc}.color-3{--card-bg:#fff0d5;--card-ink:#b58b36;--card-icon:#ffe4ac}.color-4{--card-bg:#ffe7e3;--card-ink:#c78175;--card-icon:#ffdad3}.color-5{--card-bg:#f8e3f2;--card-ink:#b975a0;--card-icon:#efcfe5}.color-6{--card-bg:#e1f3f5;--card-ink:#5396a1;--card-icon:#c9e7eb}.color-7{--card-bg:#f4eadd;--card-ink:#ac8b64;--card-icon:#eaddc9}.subject-symbol{position:relative;width:54px;height:54px;display:flex;align-items:center;justify-content:center;border-radius:16px;background:var(--card-icon);margin-bottom:18px}.color-subject h3{position:relative;color:#38364a;font-size:14px;font-weight:700;line-height:1.5;letter-spacing:-.2px;margin-bottom:17px;max-width:94%}.subject-bottom{position:relative;margin-top:auto;display:flex;justify-content:space-between;align-items:center;width:100%;font-size:9px}.subject-bottom>span{opacity:.9}.ready .subject-bottom>span{padding:5px 7px;background:#fff;border-radius:5px;font-weight:500;color:#7257b3}.subject-doodle{position:absolute;font-family:Georgia,serif;font-size:115px;line-height:1;font-weight:400;right:8px;top:-10px;color:var(--card-icon);opacity:.65;transform:rotate(-15deg);-webkit-user-select:none;user-select:none}.upcoming .subject-bottom>svg{opacity:.55}.catalog-footnote{font-size:10px;color:#9899ab;margin:28px 1px 0;line-height:1.7}.content-heading{display:flex;align-items:center;gap:19px;margin-bottom:22px}.content-heading h1{font-size:31px;letter-spacing:-1px;margin:0;line-height:1.35}.content-heading .eyebrow{font-size:9px;letter-spacing:1px;margin-bottom:6px;color:#9b93b3}.content-subject-icon{display:flex;width:64px;height:64px;border-radius:19px;align-items:center;justify-content:center;background:var(--card-bg);color:var(--card-ink);flex-shrink:0}.section-helper{font-size:13px;color:#8c8da2;margin-bottom:25px}.simple-topic-list{display:grid;grid-template-columns:1fr;gap:11px;max-width:900px}.simple-topic{display:flex;border:1px solid #e9e7f0;border-radius:13px;background:#fff;align-items:center;overflow:hidden}.topic-open{display:flex;align-items:center;gap:20px;text-align:left;flex:1;width:100%;padding:21px 23px;min-height:86px;opacity:1!important}.topic-open .topic-number{font-size:15px;color:#b3abc6;flex-shrink:0;width:24px}.topic-open>span:nth-child(2){flex:1}.topic-open strong{font-size:13px;font-weight:500;color:#77778a}.topic-open small{display:block;font-size:10px;color:#a3a2b0;line-height:1.6;margin-top:5px}.topic-open>svg{color:#b5b0c0;flex-shrink:0}.available-topic{border-color:#d7cef8;box-shadow:0 4px 12px #6751bd04}.available-topic .topic-open strong{color:#504478;font-weight:600}.available-topic .topic-number{color:#8b76c7;background:#f0eaff;border-radius:8px;width:33px;height:33px;display:flex;align-items:center;justify-content:center}.available-topic .topic-open small{color:#9485b4}.available-topic .topic-open>svg{color:#8d76ce}.topic-star{display:flex;align-items:center;justify-content:center;color:#c1bacf;padding:15px;margin-right:10px;flex-shrink:0;align-self:stretch}.topic-star.saved{color:#d8a13c}.topic-star:hover{color:#c59a44}.favorite-unit{display:flex;align-items:center;justify-content:center;gap:8px;padding:12px 17px;border:1px solid #dcd6ef;background:#fff;border-radius:9px;font-size:11px;color:#9387af;white-space:nowrap}.favorite-unit.saved{color:#bb8d30;border-color:#eddab0;background:#fffcf3}.favorite-color{background:#fff0cd;color:#d4a342}.empty-workspace{background:#fff;border:1px dashed #ded9ed;border-radius:20px;padding:60px 25px;text-align:center;max-width:850px}.empty-workspace>svg{color:#baa9e4;margin-bottom:22px}.empty-workspace h2{font-size:22px;letter-spacing:-.6px;margin-bottom:10px}.empty-workspace p{font-size:12px;color:#9490a3;max-width:420px;margin:0 auto 26px}.favorite-card{display:flex;gap:28px;align-items:center;background:#fff;border:1px solid #e8e3f2;padding:27px;border-radius:18px;max-width:850px}.favorite-illustration{display:flex;flex-direction:column;align-items:center;justify-content:center;width:115px;height:125px;border-radius:18px;background:#eee7ff;color:#86b;font-family:Georgia,serif;font-size:35px;flex-shrink:0}.favorite-illustration>span:first-child{border-bottom:1px solid #b6a2d3;padding:0 12px}.favorite-card small{font-size:10px;color:#9e94ad}.favorite-card h2{font-size:21px;margin:9px 0 8px;letter-spacing:-.6px}.favorite-card p{font-size:11px;color:#9290a0;margin-bottom:18px}.favorite-card>.topic-star{margin-left:auto;align-self:flex-start}.simple-footer{display:flex;justify-content:space-between;padding:22px 5%;font-size:9px;color:#a19eb1;background:transparent;border-color:#eae8f2}.app-v2 .unit-heading{background:#f0edfc;padding-top:22px}.app-v2 .unit-title h1{font-size:32px;letter-spacing:-1px}.app-v2 .unit-title p{font-size:12px;color:#8b82a3}.app-v2 .unit-title .eyebrow{font-size:8px;letter-spacing:1.1px;color:#9484b6}.app-v2 .tab-bar{gap:16px}.app-v2 .tab-bar button{padding:17px 15px;font-size:12px}.app-v2 .tab-bar button.selected{color:#7961c7;border-color:#9579dc}.app-v2 .unit-body{max-width:1200px}.app-v2 .download-row{font-size:10px}.app-v2 .lesson-content h2{font-size:27px;letter-spacing:-.7px}.app-v2 .lesson-content .lesson-intro{font-size:16px}.app-v2 .lesson-index>button.selected{background:#ece6fb;color:#7b60b9}.app-v2 .fraction-demo{background:#eee9fa}.app-v2 .fraction-bar .filled{background:#9b80d3;border-color:#9b80d3}.app-v2 .fraction-bar span{border-color:#d1c5e3;background:#fff}.app-v2 .map-root{background:#8170bd}.app-v2 .map-node{border-color:#9b80c3;background:#ede8f8}.app-v2 .map-node-1,.app-v2 .map-node-4{background:#fff1d9;border-color:#d5b065}.app-v2 .map-node-2,.app-v2 .map-node-5{background:#e8f3fa;border-color:#8cb3cc}.app-v2 .summary-card{border-color:#e5e1ef}.app-v2 .index-badge{background:#eee7ff;color:#8972be}.app-v2 .practice-modes{background:#eeebf6}.app-v2 .practice-score{background:#ece6fa}.app-v2 .remember{background:#efebfa;border-color:#e1d9ef}.app-v2 .filters{background:#f0edf7;border-color:#e2ddec}.app-v2 .answer-row button{background:#8973bf}.app-v2 .concept-map{border-color:#e1dbea;background:#fff}.app-v2 .example-box{background:#fff3db;border-color:#eedcba}.app-v2 .auth-dialog{background:#fff}.app-v2 .brand-mark{background:#7962ca}.app-v2 .toast{background:#6e58a6}.app-v2 .correct{border-color:#add4bb;background:#f9fdfb}.app-v2 .incorrect{border-color:#e6baa6;background:#fffdfb}@media(min-width:1400px){.simple-workspace{padding-left:25px;padding-right:25px}.workspace-header{padding-left:max(5%,calc((100% - 1110px)/2));padding-right:max(5%,calc((100% - 1110px)/2))}}@media(max-width:1000px){.color-subject-grid{grid-template-columns:repeat(3,1fr)}.workspace-header{gap:20px}.header-course{gap:15px}.workspace-header .brand{min-width:150px}.header-course>span{display:none}.simple-workspace{padding:30px 5% 45px}.workspace-welcome h1{font-size:27px}.workspace-welcome h1>span{margin-left:10px}.unit-title .favorite-unit{font-size:10px;padding:10px 12px}.access-decoration>span{left:5px}.access-decoration>span:nth-child(2){right:5px}}@media(max-width:700px){.workspace-header{height:75px;padding:0 5%;gap:12px}.workspace-header .brand{font-size:18px;min-width:0;gap:9px}.workspace-header .brand-mark{width:37px;height:37px;border-radius:12px}.brand-caption{font-size:7px}.header-course{margin:0 0 0 auto}.course-switch select{font-size:10px;min-width:116px;padding:10px 25px 10px 10px}.course-switch>svg{right:8px;top:10px;width:13px}.demo-pill{display:none}.account-actions{gap:0}.account-button{width:32px;height:32px}.account-button>svg{width:17px}.workspace-nav{gap:25px;padding:0 4%;justify-content:flex-start}.workspace-nav>button{font-size:11px;padding:16px 8px;gap:7px}.workspace-nav>button>svg{width:17px}.access-panel{padding:38px 6% 30px;min-height:calc(100vh - 140px)}.access-panel>h1{font-size:33px;letter-spacing:-1.1px;line-height:1.3}.access-panel>.eyebrow{font-size:8px;letter-spacing:1.3px}.access-intro{font-size:12px;line-height:1.8;max-width:280px;margin:0 auto 25px}.access-card{padding:23px 20px;border-radius:19px}.access-card>h2{font-size:16px;margin-bottom:20px}.role-options{gap:11px;margin-bottom:22px}.role-options>button{padding:22px 8px 18px;border-radius:13px}.role-options>button>span{width:50px;height:50px;border-radius:16px}.role-options>button>strong{font-size:12px}.role-options>button>small{font-size:9px}.role-options>button>svg{width:15px;top:8px;right:7px}.entry-course{font-size:11px}.entry-course select{font-size:12px}.access-note{font-size:9px;margin:18px 0 0}.access-bottom{font-size:9px}.access-decoration{display:none}.workspace-header>.login{font-size:10px;gap:5px}.simple-workspace{padding:25px 5% 40px}.workspace-welcome{padding:25px 22px;min-height:146px;border-radius:17px;margin-bottom:28px}.workspace-welcome h1{font-size:23px;letter-spacing:-.7px;line-height:1.3}.workspace-welcome h1>span{display:block;margin:7px 0 0;font-size:20px}.workspace-welcome .eyebrow{font-size:7px;margin-bottom:9px;letter-spacing:1px}.workspace-welcome p{font-size:10px;margin-top:10px;max-width:180px;line-height:1.6}.welcome-art{position:absolute;right:20px;padding:0;gap:8px}.welcome-art>svg{width:57px;height:57px;padding:11px;border-radius:17px}.welcome-art>span{display:none}.workspace-section-title{margin-bottom:16px}.workspace-section-title h2{font-size:17px}.workspace-section-title>span{font-size:9px}.color-subject-grid{grid-template-columns:repeat(2,1fr);gap:12px}.color-subject{padding:19px 16px 15px;border-radius:15px;min-height:177px}.subject-symbol{width:45px;height:45px;border-radius:14px;margin-bottom:16px}.subject-symbol>svg{width:27px}.color-subject h3{font-size:12px;line-height:1.55;margin-bottom:15px;max-width:100%}.subject-doodle{font-size:95px;right:3px;top:-5px}.subject-bottom{font-size:8px;gap:5px}.subject-bottom>svg{width:15px}.ready .subject-bottom>span{font-size:8px;padding:4px 5px}.catalog-footnote{font-size:9px;margin-top:24px}.content-heading{gap:13px;margin-bottom:20px}.content-heading h1{font-size:25px;letter-spacing:-.7px}.content-heading .eyebrow{font-size:8px}.content-subject-icon{width:52px;height:52px;border-radius:16px}.section-helper{font-size:12px}.simple-topic-list{gap:10px}.topic-open{padding:18px 14px;gap:12px;min-height:85px}.topic-open .topic-number{font-size:12px;width:20px}.available-topic .topic-number{width:27px;height:30px;font-size:12px}.topic-open strong{font-size:12px}.topic-open small{font-size:9px;max-width:190px}.topic-open>svg{width:16px}.topic-star{padding:8px;margin-right:6px}.topic-star>svg{width:18px}.empty-workspace{padding:40px 20px;border-radius:16px}.empty-workspace h2{font-size:19px}.empty-workspace p{font-size:11px}.favorite-card{gap:17px;padding:20px 17px;align-items:flex-start;position:relative}.favorite-illustration{width:65px;height:85px;font-size:27px;border-radius:13px}.favorite-card small{font-size:8px}.favorite-card h2{font-size:17px;line-height:1.5;margin:7px 15px 8px 0}.favorite-card p{font-size:10px;line-height:1.8}.favorite-card .primary{font-size:10px;min-height:40px;padding:10px 12px}.favorite-card>.topic-star{position:absolute;top:8px;right:4px;padding:7px}.simple-footer{font-size:8px;padding:20px 5%;flex-direction:row;gap:12px}.app-v2 .unit-title{gap:14px;align-items:flex-start}.app-v2 .unit-title h1{font-size:26px;line-height:1.35}.app-v2 .unit-title .eyebrow{font-size:7px;line-height:1.6}.app-v2 .unit-title p{font-size:11px;line-height:1.8;margin-bottom:20px}.app-v2 .favorite-unit{font-size:0;padding:10px;min-width:37px;gap:0}.app-v2 .favorite-unit>svg{width:16px}.app-v2 .tab-bar{gap:0}.app-v2 .tab-bar button{padding:15px 6px;font-size:10px;gap:5px}.app-v2 .unit-body{padding:20px 5% 35px}.app-v2 .download-row{font-size:9px;gap:10px}.app-v2 .download-row>span{max-width:90px}.app-v2 .download-row>div{gap:5px;flex-wrap:wrap;justify-content:flex-end}.app-v2 .download-row a{padding:7px 8px;font-size:9px}.app-v2 .lesson-content h2{font-size:24px}.app-v2 .lesson-content .lesson-intro{font-size:14px}}.app-v2 .subject-bottom{color:#625a73}.app-v2 .subject-bottom>span{opacity:1}.app-v2 .catalog-footnote,.app-v2 .section-helper{color:#747084}.app-v2 .access-note{color:#777183}.favorites-list{display:grid;gap:18px}.favorite-illustration>span:only-child{border:0;font-size:27px;text-align:center;padding:0 8px;line-height:1.6}.app-v2 .generic-unit-diagram{display:flex;gap:12px;flex-wrap:wrap;align-items:center;background:#eee9fa;padding:22px;border-radius:13px;margin-bottom:25px}.place-value{display:grid;grid-template-columns:repeat(6,1fr);width:100%;gap:7px}.place-value>span{text-align:center;background:#fff;border-radius:8px;padding:10px 5px}.place-value small{display:block;font-size:9px;color:#7b6a9d;margin-bottom:6px}.place-value b{font-size:24px;color:#7254a8}.diagram-label{font-size:11px;color:#817195;line-height:1.7}.factor-tiles{display:flex;align-items:center;gap:15px;font-size:24px;font-weight:600;color:#8d74b5}.factor-tiles>span{padding:14px 22px;background:#fff;border-radius:10px}@media(max-width:700px){.place-value{gap:4px}.place-value>span{padding:10px 2px}.place-value small{font-size:7px}.place-value b{font-size:18px}.favorite-illustration>span:only-child{font-size:20px}}.equal-groups{display:flex;gap:12px;width:100%}.equal-groups>span{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:15px;background:#fff;border:1px solid #d9cfee;border-radius:10px}.equal-groups i{display:block;width:12px;height:12px;border-radius:50%;background:#a48acb}.square-array{display:grid;grid-template-columns:repeat(4,19px);gap:4px}.square-array>span{height:19px;background:#a48acb;border-radius:3px}.multiples-lines p{font-size:17px;color:#8972aa;letter-spacing:1px;margin:5px 0}.multiples-lines b{background:#fff;color:#655099;border-radius:5px;padding:4px 7px}.app-v2 .color-subject{background:var(--card-bg);color:var(--card-ink);border-color:color-mix(in srgb,var(--card-ink) 12%,transparent)}.app-v2 .subject-symbol{background:color-mix(in srgb,white 45%,var(--card-bg));color:var(--card-ink)}.app-v2 .subject-doodle{color:color-mix(in srgb,var(--card-ink) 18%,var(--card-bg));opacity:.65}.app-v2 .color-subject h3,.app-v2 .subject-bottom{color:var(--card-ink)}.app-v2 .subject-bottom>svg{opacity:1}.app-v2 .ready .subject-bottom>span{background:#ffffffc9;color:var(--card-ink)}.app-v2 .favorite-illustration{background:var(--card-bg);color:var(--card-ink)}.app-v2 .map-node-0{background:#e2d2fb;border-color:#9973c6}.app-v2 .map-node-1{background:#ffe4b2;border-color:#cc9e4b}.app-v2 .map-node-2{background:#cee7fc;border-color:#77aacb}.app-v2 .map-node-3{background:#cdecd9;border-color:#79b591}.app-v2 .map-node-4{background:#f5d3e8;border-color:#c183ad}.app-v2 .map-node-5{background:#f9d6c6;border-color:#cb9377}.app-v2 .tab-bar button:nth-child(1).selected{color:#5b369b;border-color:#8960c9}.app-v2 .tab-bar button:nth-child(2).selected{color:#8c5e0b;border-color:#d4a742}.app-v2 .tab-bar button:nth-child(3).selected{color:#236b7b;border-color:#5eacbf}.app-v2 .tab-bar button:nth-child(4).selected{color:#277747;border-color:#6ab283}.reading-passage{background:#fff6db;border-left:5px solid #d6a52b;padding:24px;border-radius:0 18px 18px 0;margin:22px 0;line-height:1.8;color:#3d351e}.reading-passage h3{font-size:1.35rem}.reading-passage p{font-size:1rem}.question-passage{margin:15px 0}.question-passage summary,.writing-workshop summary{cursor:pointer;font-weight:700;color:#40346c}.choice-options{display:grid;gap:10px}.choice-options label{display:flex;gap:10px;padding:13px;border:1px solid #d7d1e5;border-radius:12px;cursor:pointer;align-items:flex-start}.choice-options label.chosen{background:#eee4ff;border-color:#8056be}.choice-options input{margin-top:4px;accent-color:#7045b3;flex:0 0 auto}.choice-options button{justify-self:start}.writing-workshop{padding:28px;background:#e1eefb;border-radius:22px;margin:28px 0}.writing-workshop details{background:#fff;padding:20px;margin:14px 0;border-radius:15px}.writing-workshop label{display:grid;gap:9px;font-weight:600}.writing-workshop textarea{box-sizing:border-box;width:100%;resize:vertical;border:1px solid #b8c5da;border-radius:10px;padding:15px;font:inherit;line-height:1.6}.writing-workshop li{margin:8px 0}.activity-card h3{overflow-wrap:anywhere}.choice-options label span{min-width:0}.reading-passage{overflow-wrap:anywhere}@media(max-width:480px){.reading-passage,.writing-workshop{padding:18px}.writing-workshop details{padding:14px}}.writing-workshop textarea{font-weight:400;font-size:15px;color:#24354a}.auth-dialog{max-height:calc(100dvh - 40px);overflow-y:auto}.auth-dialog .auth-links{display:grid;justify-items:start;gap:5px}.auth-dialog .auth-message{font-size:14px;line-height:1.6;white-space:pre-line}.auth-dialog .auth-error{color:#a52837;background:#fff0f0;border-radius:10px;padding:12px}.auth-dialog form>small{display:block;color:#5b5965;line-height:1.5}.auth-dialog .checkbox{align-items:flex-start}.auth-dialog .checkbox input{flex:0 0 auto;width:18px;margin-top:3px}.auth-dialog button:disabled{opacity:.6;cursor:wait}.workspace-header .brand-logo{display:block;width:66px;height:53px;flex:0 0 auto;overflow:hidden;border-radius:7px}.workspace-header .brand-name{display:block}@media(max-width:700px){.workspace-header .brand-logo{width:48px;height:39px}.workspace-header .brand-name{font-size:17px}}@media(max-width:480px){.workspace-header{padding-inline:4%;gap:8px}.workspace-header .brand{gap:8px}.workspace-header .brand-logo{width:42px;height:34px}.workspace-header .brand-name{max-width:80px;font-size:14px;line-height:1.2}.workspace-header .brand-caption{display:none}.course-switch select{min-width:102px}}.app-v2{--ink:#20243c;--muted:#62657a;--cream:#f8f8fc;--line:#e2e3ed;color:var(--ink);font-family:Arial,Helvetica,sans-serif}.app-v2 h1,.app-v2 h2,.app-v2 h3,.app-v2 .brand{font-family:Arial,Helvetica,sans-serif}.app-v2 button:focus-visible,.app-v2 a:focus-visible,.app-v2 input:focus-visible,.app-v2 summary:focus-visible{outline:3px solid #322165;outline-offset:4px}.app-v2 .eyebrow{font-size:11px;letter-spacing:1.5px;font-weight:800}.workspace-header{padding-inline:max(5%,calc((100% - 1200px)/2));height:84px}.workspace-header .brand{font-size:23px}.header-course>span{font-size:13px}.course-switch select{font-size:14px}.demo-pill{font-size:11px}.workspace-nav>button{font-size:14px}.simple-workspace{max-width:1300px;padding:38px 50px 60px}.course-hero{min-height:340px;position:relative;isolation:isolate;border-radius:28px;overflow:hidden;background:#292348;color:#fff;display:grid;grid-template-columns:1.2fr 1fr;padding:44px 48px;margin-bottom:42px}.hero-label{font-size:11px;font-weight:800;letter-spacing:2px;color:#d4c8ff}.course-hero h1{font-size:clamp(32px,3.5vw,48px);letter-spacing:-1.9px;line-height:1.13;margin:20px 0 18px}.course-hero h1 em{font-style:normal;color:#d7fc80}.hero-copy>p{font-size:15px;line-height:1.75;color:#e1dbf1;margin-bottom:25px}.hero-copy>button{background:#d7fc80;color:#263120;border-radius:13px;padding:16px 20px;font-size:14px;font-weight:750;display:inline-flex;align-items:center;gap:20px}.hero-composition{position:relative;min-height:250px}.hero-orbit{position:absolute;width:290px;height:290px;border:1px solid #71638d;border-radius:50%;right:0;top:5px}.hero-orbit:after{content:"";position:absolute;inset:30px;border:1px dashed #71638d;border-radius:50%}.hero-sheet{position:absolute;box-shadow:0 15px 35px #16102455;border-radius:15px;padding:23px;color:#33234e;z-index:1}.hero-sheet span{display:block;font-size:10px;font-weight:800;letter-spacing:1.2px;margin-bottom:12px}.sheet-one{background:#d9c7ff;transform:rotate(-9deg);width:255px;top:25px;left:12px}.sheet-one b{display:block;font-size:28px;letter-spacing:-1px}.sheet-one i{display:block;font-size:20px;font-style:normal;margin-top:13px}.sheet-two{background:#ffb68d;transform:rotate(9deg);right:0;bottom:-4px;width:190px}.hero-stamp{position:absolute;right:-7px;top:-16px;z-index:2;background:#d7fc80;width:102px;height:102px;border-radius:50%;color:#282443;text-align:center;font-size:65px;font-weight:800;line-height:1.05;padding-top:7px;transform:rotate(12deg)}.hero-stamp span{display:block;font-size:10px;letter-spacing:2px}.tiny-map{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:13px}.tiny-map i{background:#fff5e8;height:22px;border-radius:6px;border:2px solid #7c4c37}.hero-spark{position:absolute;font-size:52px;color:#e4d6ff;z-index:2}.spark-one{bottom:-5px;left:3px}.spark-two{right:10px;top:103px;color:#ffb68d}.workspace-section-title h2{font-size:25px}.workspace-section-title>span{font-size:12px}.app-v2 .color-subject-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.app-v2 .color-subject{border:0;min-height:218px;border-radius:23px;padding:25px;overflow:hidden;position:relative;transition:transform .18s,box-shadow .18s;box-shadow:none;text-align:left}.app-v2 .color-subject:hover{transform:translateY(-5px);box-shadow:0 12px 26px #24244015}.app-v2 .color-subject h3{font-size:20px;line-height:1.25;max-width:78%;margin:28px 0 25px;position:relative;z-index:1;letter-spacing:-.3px}.app-v2 .subject-symbol{width:41px;height:41px;border-radius:12px;position:relative;z-index:1}.app-v2 .subject-art{position:absolute;right:-1px;top:12px;width:145px;height:145px;opacity:.21}.subject-art text{fill:currentColor;stroke:none;font-size:32px;font-weight:800}.app-v2 .subject-bottom{font-size:12px;position:relative;z-index:1}.app-v2 .subject-bottom>span{padding:7px 10px;border-radius:7px}.catalog-footnote{font-size:12px!important;line-height:1.7}.app-v2 .content-heading h1{font-size:42px}.app-v2 .section-helper{font-size:16px}.app-v2 .simple-topic{border-radius:16px}.app-v2 .topic-open{padding:23px}.app-v2 .topic-open strong{font-size:18px}.app-v2 .topic-open small{font-size:12px;line-height:1.7}.app-v2 .topic-number{font-size:17px}.app-v2 .unit-heading{background:#f0edf9;padding-top:30px}.app-v2 .pilot-heading{background:#e9e3fa}.app-v2 .unit-title h1{font-size:clamp(30px,4vw,47px);max-width:850px;letter-spacing:-1.7px;line-height:1.12}.app-v2 .unit-title p{font-size:16px;max-width:650px;line-height:1.65}.app-v2 .breadcrumb{font-size:12px;margin-bottom:24px}.unit-facts{display:flex;gap:10px;flex-wrap:wrap;margin:4px 0 30px}.unit-facts>span{font-size:11px;padding:8px 11px;background:#fff9;border-radius:8px;color:#49376f}.app-v2 .favorite-unit{font-size:12px}.app-v2 .tab-bar button{font-size:14px;padding:20px 24px}.app-v2 .unit-body{max-width:1300px;padding:27px 50px 60px}.app-v2 .download-row{font-size:12px;margin-bottom:25px}.app-v2 .download-row a{font-size:12px;padding:10px 13px}.app-v2 .lesson-layout{grid-template-columns:250px minmax(0,1fr);gap:35px}.app-v2 .lesson-index{padding:22px;border-radius:20px;background:#fff;border:1px solid #e5e2ed;align-self:start;position:sticky;top:20px}.app-v2 .lesson-index>button{font-size:13px;line-height:1.45;padding:13px 10px;gap:10px}.app-v2 .lesson-index>button.selected{color:#49307c;background:#ede6fb;font-weight:700}.app-v2 .lesson-index>button>span{font-size:10px}.app-v2 .lesson-content{background:#fff;border:1px solid #e5e2ed;border-radius:22px;padding:34px 38px;min-width:0}.app-v2 .lesson-content h2{font-size:30px;letter-spacing:-1px;line-height:1.22}.app-v2 .lesson-content>p{font-size:16px;line-height:1.85;color:#47495d;margin-bottom:21px}.app-v2 .lesson-content .lesson-intro{font-size:18px;color:#30314b;line-height:1.75}.app-v2 .lesson-kicker{font-size:11px;margin-bottom:16px}.app-v2 .small-note{font-size:11px;line-height:1.65;color:#64657a}.app-v2 .inline-video{font-size:12px;background:#f1edf9;padding:13px;border-radius:10px}.number-lab{border:1px solid #cbb9f2;background:#f3eeff;border-radius:17px;padding:25px;margin:25px 0}.number-lab .eyebrow{display:block;color:#5f478c;font-size:10px;line-height:1.6}.digit-lab{display:grid;grid-template-columns:repeat(6,1fr);gap:9px;margin:20px 0}.digit-lab button{font-size:35px;font-weight:750;padding:12px 0;border-radius:10px;background:#fff;color:#574370;border:2px solid transparent}.digit-lab button.active{background:#6b40b0;color:#fff;border-color:#442770}.number-lab>p{font-size:14px;line-height:1.8;margin:14px 0 0;color:#514466}.lab-result{display:block;color:#54318a;font-size:24px;margin-top:13px;line-height:1.45}.number-lab label{display:grid;gap:12px;font-size:14px;margin-top:15px}.number-lab input[type=range]{width:100%;accent-color:#6b40b0}.power-grid{display:grid;gap:5px;width:200px;max-width:100%;margin:20px 0}.power-grid i{display:block;aspect-ratio:1;background:#8c63c6;border-radius:4px}.lab-toggle{display:flex;gap:8px;margin:15px 0;flex-wrap:wrap}.lab-toggle button{padding:11px 12px;background:#fff;border:1px solid #d9caef;border-radius:9px;font-size:12px}.lab-toggle button[aria-pressed=true]{background:#6b40b0;color:#fff;border-color:#6b40b0}.lab-expression{display:block;font-size:30px;color:#483166;margin:23px 0}.operation-flow{display:flex;gap:13px;align-items:center;flex-wrap:wrap}.operation-flow span{padding:11px;background:#fff;border-radius:9px;font-size:16px}.worked-example{background:#f2f7e8;border-radius:17px;padding:25px;margin:25px 0}.worked-title{display:flex;gap:14px;color:#42602a;align-items:flex-start}.worked-title .eyebrow{font-size:10px}.worked-title h3{font-size:21px;line-height:1.4;letter-spacing:-.4px;margin:7px 0 20px}.worked-example ol{list-style:none;padding:0;margin:0;display:grid;gap:17px}.worked-example li{display:flex;gap:14px;align-items:flex-start}.worked-example li>span{background:#d1e5ad;color:#30471b;border-radius:50%;width:27px;height:27px;flex:0 0 27px;display:grid;place-items:center;font-size:12px;font-weight:800}.worked-example h4{margin:3px 0 6px;font-size:14px;color:#324326}.worked-example li p{font-size:14px;line-height:1.75;margin:0;color:#4d5942}.app-v2 .error-box{background:#fff2df;border:1px solid #f0d4a3;padding:22px;border-radius:14px}.app-v2 .error-box strong{font-size:14px;color:#77501b}.app-v2 .error-box p{font-size:14px;line-height:1.75;color:#725b3b}.recall-check{padding:19px 21px;border:1px solid #d4c7e9;border-radius:13px;margin:20px 0;background:#fff}.recall-check>summary{display:flex;align-items:center;justify-content:space-between;cursor:pointer;list-style:none;font-size:14px;font-weight:700;color:#593d86}.recall-check p{font-size:15px;line-height:1.75;margin-top:17px}.recall-check details summary{font-size:13px;cursor:pointer;color:#60458e}.study-summary>header,.pilot-concept>header{max-width:800px;margin:12px 0 35px}.study-summary>header h2,.pilot-concept>header h2{font-size:37px;letter-spacing:-1.3px;line-height:1.16;margin:15px 0}.study-summary>header p,.pilot-concept>header p{font-size:16px;line-height:1.8;color:#646277}.study-chapter{background:#fff;border:1px solid #e1dce9;border-radius:22px;padding:32px 38px;margin:24px 0}.study-chapter-head{display:flex;gap:20px;align-items:center;margin-bottom:23px}.study-chapter-head>span{font-size:29px;letter-spacing:-1px;color:#7652a9;background:#eee6fb;padding:13px;border-radius:12px;font-weight:800}.study-chapter-head small{font-size:11px;letter-spacing:.8px;text-transform:uppercase;color:#675184;font-weight:700}.study-chapter-head h3{font-size:25px;letter-spacing:-.6px;margin:8px 0 0;line-height:1.3}.study-chapter-head>button{margin-left:auto;flex-shrink:0;border:1px solid #ddd5e8;border-radius:50%;padding:10px}.study-principle{font-size:20px;line-height:1.6;color:#493065;margin:20px 0}.essential-list{padding-left:21px;columns:2;column-gap:45px}.essential-list li{break-inside:avoid;font-size:15px;line-height:1.85;padding-left:8px;margin-bottom:18px;color:#4a4a60}.summary-case{background:#f0f5e8;border-radius:13px;padding:24px;margin:20px 0}.summary-case>strong{font-size:17px;line-height:1.6;color:#36522b}.summary-case p{font-size:14px;line-height:1.8;margin:13px 0 0;color:#48543f}.summary-error{font-size:14px;border-left:3px solid #e8b76c;padding:0 0 0 16px;margin:23px 0}.summary-error p{margin:8px 0;line-height:1.7;color:#735c40}.summary-checklist{padding:30px;background:#292348;color:#fff;border-radius:20px;margin:30px 0}.summary-checklist h3{font-size:23px}.summary-checklist p{font-size:15px;line-height:1.8;color:#e6e0f3}.summary-checklist button{display:flex;align-items:center;gap:13px;background:#d7fc80;color:#263120;border-radius:10px;padding:13px;font-size:13px;font-weight:700}.concept-canvas{background:#fff;border:1px solid #e1dce9;border-radius:24px;padding:35px;margin:25px 0}.concept-origin{background:#292348;color:#fff;border-radius:18px;padding:25px;max-width:420px;margin:auto;text-align:center}.concept-origin small{display:block;font-size:10px;color:#d2c3f0;letter-spacing:1.4px}.concept-origin strong{display:block;font-size:30px;letter-spacing:-.8px;margin:12px 0}.concept-origin>span{font-size:13px;color:#e3dcf2}.concept-stem{height:36px;width:2px;background:#c1b3d7;margin:auto}.concept-branches{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;border-top:2px solid #c1b3d7;padding-top:24px}.concept-branch{text-align:left;border:2px solid transparent;position:relative;border-radius:15px;padding:22px;display:flex;flex-direction:column;gap:14px}.concept-branch:before{content:"";position:absolute;top:-26px;height:24px;width:2px;background:#c1b3d7;left:50%}.concept-branch:nth-child(n+4):before{display:none}.concept-branch>small{font-size:9px;font-weight:800;letter-spacing:1px}.concept-branch>strong{font-size:20px;line-height:1.3;letter-spacing:-.5px}.concept-branch>span{font-size:13px;line-height:1.6}.concept-branch>b{font-size:13px;line-height:1.65;padding:12px;background:#ffffffa6;border-radius:9px;margin-top:auto}.concept-branch>.branch-action{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:700}.branch-0{background:#e3d4fb;color:#4c2b7b}.branch-1{background:#ffe4b1;color:#684411}.branch-2{background:#cfe9fd;color:#254c68}.branch-3{background:#d1edda;color:#315c3b}.branch-4{background:#f8d5e8;color:#73314f}.branch-5{background:#ffdcc7;color:#713f26}.concept-branch.active{border-color:currentColor;box-shadow:0 5px #2923480c}.concept-detail{border-radius:22px;padding:32px;margin-top:27px}.concept-detail h3{font-size:29px;margin:13px 0}.concept-detail .study-principle{color:inherit}.concept-detail ul{columns:2;column-gap:40px;padding-left:20px}.concept-detail li{font-size:14px;line-height:1.85;margin:0 0 15px;break-inside:avoid}.map-connection{padding:22px;background:#ffffffa6;border-radius:12px;margin:20px 0}.map-connection b{font-size:14px}.map-connection p{font-size:14px;line-height:1.8;margin:10px 0 0}.concept-detail .secondary{background:#fff}.concept-final{display:flex;align-items:center;justify-content:center;gap:18px;flex-wrap:wrap;padding:30px;font-size:12px;font-weight:800;letter-spacing:1px;color:#5c437f}.concept-final svg{width:18px}.app-v2 .practice-heading h2{font-size:36px}.app-v2 .practice-heading p{font-size:15px;line-height:1.8;max-width:750px}.app-v2 .practice-score strong{font-size:30px}.app-v2 .practice-score span{font-size:11px}.app-v2 .practice-modes button{font-size:13px;padding:14px 20px}.app-v2 .filters label{font-size:12px}.app-v2 .filters select{font-size:13px;padding:12px}.app-v2 .activity-grid{gap:22px}.app-v2 .activity-card{padding:27px;border-radius:19px;align-self:start;box-shadow:0 4px 14px #2a223508}.app-v2 .activity-meta{font-size:10px}.app-v2 .activity-card h3{font-size:19px;line-height:1.65;letter-spacing:-.25px;margin:22px 0 14px}.answer-instruction{font-size:12px;line-height:1.7;color:#696276;padding-bottom:13px}.app-v2 .answer-row input{font-size:15px;padding:14px;min-width:0;height:49px}.app-v2 .answer-row>button{height:49px;min-width:49px;background:#634195;color:#fff}.activity-hint{font-size:13px;border-top:1px solid #e9e3ef;margin:15px 0;padding-top:15px}.activity-hint summary{display:flex;align-items:center;gap:8px;cursor:pointer;color:#735126;font-weight:700}.activity-hint p{font-size:13px;line-height:1.75;background:#fff4df;padding:16px;border-radius:10px;margin:13px 0}.app-v2 .feedback{padding:18px;border-radius:12px;margin-top:18px}.app-v2 .feedback strong{font-size:14px}.app-v2 .feedback p{font-size:14px;line-height:1.75}.feedback-review{display:flex;align-items:center;gap:5px;font-size:11px;font-weight:700;text-align:left;padding:10px 0}.activity-pagination{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:25px 0;background:#fff;border:1px solid #e2daed;border-radius:13px;padding:16px}.activity-pagination button{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;padding:10px;background:#eee6fb;border-radius:9px;color:#50377c}.activity-pagination button:disabled{opacity:.4}.activity-pagination>span{font-size:12px;color:#64596e}.app-v2 .sources{font-size:12px;line-height:1.8}.app-v2 .simple-footer{font-size:10px}.app-v2 .primary,.app-v2 .text-button{font-size:13px}@media(max-width:1000px){.simple-workspace,.app-v2 .unit-body{padding-inline:30px}.course-hero{padding:36px 30px;grid-template-columns:1.15fr 1fr}.hero-sheet{padding:20px}.sheet-one{width:210px;left:0}.sheet-one b{font-size:23px}.sheet-two{width:155px}.hero-stamp{width:85px;height:85px;font-size:51px}.hero-stamp span{font-size:8px}.hero-orbit{width:230px;height:230px}.app-v2 .lesson-layout{grid-template-columns:210px minmax(0,1fr);gap:22px}.app-v2 .lesson-content{padding:26px}.concept-canvas{padding:24px}.concept-branch{padding:17px}.concept-branch>strong{font-size:18px}.essential-list{columns:1}.header-course>span{display:none}}@media(max-width:740px){.workspace-header{padding-inline:22px;gap:15px}.workspace-header .brand{min-width:0;font-size:20px}.course-switch select{font-size:12px;min-width:125px}.account-actions{gap:8px}.demo-pill{display:none}.workspace-nav{gap:22px}.workspace-nav>button{font-size:13px;padding:18px 2px}.simple-workspace,.app-v2 .unit-body{padding:25px 22px 40px}.course-hero{padding:30px;border-radius:23px;grid-template-columns:1fr;min-height:0;margin-bottom:30px}.course-hero h1{font-size:39px}.hero-composition{display:none}.hero-copy>p{font-size:14px}.hero-copy>button{font-size:12px;width:100%;justify-content:space-between;padding:15px}.app-v2 .color-subject-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.app-v2 .color-subject{padding:21px;min-height:205px;border-radius:19px}.app-v2 .color-subject h3{font-size:17px;max-width:100%;margin-top:30px}.app-v2 .subject-art{width:117px;right:-10px}.app-v2 .subject-bottom{font-size:10px}.app-v2 .subject-bottom>span{padding:5px 7px}.workspace-section-title h2{font-size:23px}.app-v2 .unit-heading{padding:25px 22px 0}.app-v2 .unit-title h1{font-size:35px;letter-spacing:-1.2px}.app-v2 .unit-title p{font-size:14px}.app-v2 .unit-title .eyebrow{font-size:9px}.app-v2 .tab-bar{gap:0;justify-content:space-between}.app-v2 .tab-bar button{font-size:12px;padding:17px 8px;gap:6px}.app-v2 .tab-bar button svg{width:17px}.app-v2 .breadcrumb{font-size:10px;line-height:1.6;flex-wrap:wrap}.unit-facts{gap:7px}.unit-facts>span{font-size:10px;padding:7px}.app-v2 .favorite-unit{font-size:0;gap:0;min-width:40px;padding:10px}.app-v2 .lesson-layout{grid-template-columns:1fr;gap:22px}.app-v2 .lesson-index{position:static;display:grid;grid-template-columns:1fr 1fr;padding:17px;gap:6px}.lesson-index>.eyebrow,.lesson-index>.video-link,.lesson-index>.small-note{grid-column:1/-1}.app-v2 .lesson-index>button{font-size:12px;padding:12px 8px;margin:0}.app-v2 .lesson-index>.video-link{margin-top:13px}.app-v2 .lesson-content{padding:25px 22px}.app-v2 .lesson-content h2{font-size:27px}.app-v2 .lesson-content>p{font-size:15px}.app-v2 .lesson-content .lesson-intro{font-size:17px}.app-v2 .download-row{font-size:11px}.app-v2 .download-row a{font-size:11px;padding:9px}.study-summary>header h2,.pilot-concept>header h2{font-size:29px}.study-summary>header p,.pilot-concept>header p{font-size:15px}.study-chapter{padding:25px 22px}.study-chapter-head{gap:12px;align-items:flex-start}.study-chapter-head>span{font-size:22px;padding:11px}.study-chapter-head h3{font-size:21px}.study-chapter-head small{font-size:9px}.study-chapter-head>button{padding:7px}.study-principle{font-size:18px}.summary-case{padding:19px}.concept-canvas{padding:22px 16px}.concept-origin strong{font-size:25px}.concept-branches{grid-template-columns:1fr 1fr;gap:12px}.concept-branch{padding:16px 12px;gap:12px}.concept-branch:nth-child(3):before{display:none}.concept-branch>strong{font-size:17px}.concept-branch>span,.concept-branch>b{font-size:12px}.concept-branch>small{font-size:8px;letter-spacing:.7px}.concept-detail{padding:25px 22px}.concept-detail h3{font-size:25px}.concept-detail ul{columns:1}.concept-final{gap:10px;font-size:9px;padding:25px 0}.concept-final svg{width:13px}.app-v2 .practice-heading h2{font-size:29px}.app-v2 .practice-heading p{font-size:14px}.app-v2 .practice-modes button{font-size:11px;padding:12px}.app-v2 .activity-card{padding:23px}.app-v2 .activity-card h3{font-size:18px}.app-v2 .activity-grid{grid-template-columns:1fr}.app-v2 .filters{gap:15px;flex-wrap:wrap}.app-v2 .filters label{flex:1}.app-v2 .filters .text-button{font-size:11px}.activity-pagination{padding:12px;gap:7px}.activity-pagination>span{font-size:10px;text-align:center}.activity-pagination button{font-size:11px;padding:10px 8px}.number-lab{padding:20px 16px}.digit-lab{gap:5px}.digit-lab button{font-size:28px;padding:10px 0}.lab-result{font-size:21px}.lab-expression{font-size:26px}.worked-example{padding:22px 19px}.worked-title h3{font-size:19px}.app-v2 .lesson-next{flex-wrap:wrap;gap:15px}}@media(max-width:365px){.workspace-header{padding-inline:16px}.workspace-header .brand{font-size:17px}.workspace-header .brand-mark{width:36px;height:36px}.account-button{width:33px;height:33px}.course-switch select{min-width:112px;padding:10px 25px 10px 9px;font-size:11px}.simple-workspace,.app-v2 .unit-body{padding-inline:16px}.course-hero{padding:26px 22px}.course-hero h1{font-size:34px}.app-v2 .color-subject{padding:16px;min-height:194px}.app-v2 .color-subject h3{font-size:15px}.app-v2 .subject-bottom{font-size:9px}.app-v2 .subject-art{width:100px}.app-v2 .tab-bar button{font-size:10px;padding:16px 5px;gap:4px}.app-v2 .unit-title h1{font-size:31px}.concept-branches{grid-template-columns:1fr}.concept-branch:nth-child(n+2):before{display:none}.concept-branch{padding:20px}.concept-branch>strong{font-size:19px}.digit-lab button{font-size:24px}.app-v2 .lesson-index{grid-template-columns:1fr}.study-chapter{padding:22px 18px}.study-chapter-head h3{font-size:19px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.access-view main{background:#24203e;background-image:radial-gradient(ellipse at 15% 90%,#51407760,transparent 55%)}.access-view .access-panel{max-width:1300px;min-height:calc(100vh - 146px);display:grid;grid-template-columns:1.2fr 1fr;gap:38px;align-items:center;padding:60px 50px;text-align:left}.access-message{color:#fff;position:relative}.access-message>.eyebrow{color:#d7c9f4;font-size:10px;line-height:1.8}.access-message h1{font-size:clamp(52px,6.5vw,83px);line-height:1.01;letter-spacing:-4px;margin:27px 0}.access-message h1 em{font-style:normal;color:#d7fc80}.access-view .access-intro{font-size:16px;line-height:1.8;color:#ddd6ef;margin:25px 0 35px}.access-pillars{display:flex;gap:22px;font-size:11px;color:#c2b2db;flex-wrap:wrap}.access-pillars b{display:block;font-size:13px;color:#f1edf6;margin-top:8px}.access-view .access-decoration{display:none}.access-view .access-card{max-width:none;width:100%;padding:33px;border-radius:24px;margin:0;box-shadow:0 20px 50px #100a2840}.access-view .access-card h2{font-size:22px;margin-bottom:25px}.access-view .access-note{font-size:11px;line-height:1.7;text-align:center}.access-view .entry-course{font-size:13px}.access-view .role-options>button>strong{font-size:15px}.access-view .role-options>button>small{font-size:11px}.access-view .access-bottom{grid-column:1/-1;color:#c5bad9;text-align:center;font-size:11px;margin:0}.access-view .simple-footer{background:#19172d;color:#c1b5da;border:0}.access-view .enter-workspace{font-size:14px;background:#6b41b3}.access-view .brand-caption{font-size:9px}@media(max-width:740px){.access-view .access-panel{grid-template-columns:1fr;padding:35px 22px;gap:30px}.access-message h1{font-size:58px;letter-spacing:-2.8px;margin:21px 0}.access-view .access-intro{font-size:14px;margin:20px 0 25px}.access-view .access-card{padding:25px}.access-view .access-card h2{font-size:20px}.access-pillars{gap:26px}.access-message>.eyebrow{font-size:9px}.access-view .access-bottom{font-size:10px;line-height:1.7}}@media(max-width:365px){.access-view .access-panel{padding-inline:16px}.access-message h1{font-size:50px}.access-view .access-card{padding:21px}.access-view .role-options>button{padding:20px 8px}.access-view .role-options>button>strong{font-size:13px}.access-view .role-options>button>small{font-size:9px}}.branch-6{background:#d6edf0;color:#235158}.branch-7{background:#ede5ba;color:#65541b}.branch-8{background:#dce1f2;color:#384966}.branch-9{background:#e7ecd0;color:#4b5928}.many-branches .concept-branch:before{display:none}.many-branches{border-top:0;padding-top:0}.many-branches .concept-branch:first-child:before{display:block}.lab-selects{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:15px 0}.number-lab select{width:100%;border:1px solid #cdbde5;background:#fff;padding:11px;border-radius:9px;font:inherit;color:#493260}.number-lab>label select{max-width:240px}.candidate-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin:18px 0}.candidate-grid button{padding:10px 0;border-radius:8px;background:#fff;color:#503a6d;border:1px solid #d3c4e8;font-weight:700}.candidate-grid button[aria-pressed=true]{background:#6b40b0;color:#fff}.group-visual{display:flex;flex-wrap:wrap;gap:9px;margin:20px 0}.group-visual>span{display:flex;gap:5px;flex-wrap:wrap;align-items:center;justify-content:center;max-width:170px;background:#e4d9f5;border:1px solid #ab91d0;border-radius:9px;padding:10px}.group-visual i{display:block;width:10px;height:10px;border-radius:50%;background:#7045a2}.group-visual>.leftover{background:#fff1cd;border-color:#d8aa43}.group-visual>.leftover i{background:#9a6d18}.divisor-rows p{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:14px}.divisor-rows span{padding:8px 11px;background:#fff;border-radius:7px;border:1px solid #d2c4e4}.divisor-rows .common{background:#d9edba;border-color:#86a65b;color:#3b571f;font-weight:700}.cycle-legend{display:flex;flex-wrap:wrap;gap:14px;font-size:11px;margin:20px 0}.cycle-legend span:first-child{color:#5340a1}.cycle-legend span:nth-child(2){color:#216877}.cycle-legend span:last-child{color:#694b12}.cycle-grid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:5px}.cycle-grid>span{padding:9px 1px;background:#fff;color:#71677f;text-align:center;border-radius:6px;font-size:11px;border:1px solid transparent}.cycle-grid>.cycle-a{background:#dbcefa;color:#48347c;font-weight:700}.cycle-grid>.cycle-b{background:#bde4e8;color:#205662;font-weight:700}.cycle-grid>.cycle-both{background:#fbe0a5;color:#604110;border-color:#bf8d32;font-weight:800}.fraction-strip-block{margin:20px 0}.fraction-strip-block>span{display:block;font-size:13px;font-weight:700;margin-bottom:9px}.fraction-strip{display:grid;gap:2px;width:100%;height:43px;border:2px solid #70518f;background:#70518f;border-radius:8px;overflow:hidden}.fraction-strip i{background:#fff}.fraction-strip .taken{background:#9b77d7}.portion-cups{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}.portion-cups span{display:grid;place-items:center;min-width:58px;height:65px;border:2px solid #7c5ba8;border-radius:5px 5px 18px 18px;background:#d7c3f5;font-size:12px;font-weight:700;color:#513574}.fraction-area{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;background:#fff;padding:7px;border:2px solid #65478a;border-radius:10px;max-width:400px;margin:20px 0}.fraction-area>span{aspect-ratio:1.5;background:#f0ecf5;border:1px solid #d5c9e2}.fraction-area .starting-part{background:#b9d591;border-color:#82a85a}.fraction-area .product-part{background:#9568cc;border-color:#6c429f}.area-legend{display:grid;gap:7px;font-size:12px;line-height:1.6}.amount-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:20px 0}.amount-groups>span{display:grid;gap:6px;text-align:center;background:#fff;border-radius:10px;padding:15px 5px;color:#665778}.amount-groups .included{background:#ddc9f7;color:#503373}.amount-groups b{font-size:24px}.amount-groups small{font-size:10px}@media(max-width:740px){.cycle-grid{grid-template-columns:repeat(6,minmax(0,1fr))}.lab-selects{gap:10px}.lab-selects label{font-size:12px}.candidate-grid{gap:5px}.portion-cups span{min-width:49px;height:58px}.amount-groups{gap:5px}.amount-groups b{font-size:21px}.amount-groups small{font-size:9px}.fraction-strip{gap:1px}.cycle-grid>span{font-size:10px}.lab-selects select{font-size:13px}}@media(min-width:741px){.app-v2 .lesson-index{max-height:calc(100vh - 40px);overflow-y:auto}}.concept-branches.many-branches{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 42px;position:relative;padding-top:0;border-top:0}.many-branches:before{content:"";position:absolute;left:50%;width:2px;background:#c1b3d7;top:0;bottom:80px}.many-branches .concept-branch:before,.many-branches .concept-branch:first-child:before{display:block;content:"";position:absolute;top:50%;height:2px;width:23px;left:auto;right:-25px;background:#c1b3d7}.many-branches .concept-branch:nth-child(2n):before{right:auto;left:-25px}@media(max-width:740px){.concept-branches.many-branches{column-gap:25px}.many-branches .concept-branch:before,.many-branches .concept-branch:first-child:before{width:15px;right:-17px}.many-branches .concept-branch:nth-child(2n):before{left:-17px}}@media(max-width:365px){.concept-branches.many-branches{grid-template-columns:1fr;padding-left:20px;border-top:2px solid #c1b3d7}.many-branches:before{left:0;bottom:80px}.many-branches .concept-branch:before,.many-branches .concept-branch:first-child:before,.many-branches .concept-branch:nth-child(2n):before{left:-22px;right:auto;width:20px}}.course-lab{overflow:hidden}.course-lab h3{margin:12px 0 20px;font-size:1.35rem}.course-lab svg{display:block;width:100%;max-width:520px;margin:20px auto;font-family:inherit;font-size:16px}.course-slider{display:block;margin:15px 0;font-weight:600}.course-slider input{display:block;width:100%;margin-top:12px;accent-color:#6633b4}.hundred-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:3px;max-width:340px;margin:22px auto}.hundred-grid i{aspect-ratio:1;background:#e5dcf1;border:1px solid #c6b4de;border-radius:3px}.hundred-grid i.filled{background:#713bb8}.conversion-visual{display:flex;flex-wrap:wrap;justify-content:center;gap:20px;align-items:center;margin:30px 0}.conversion-visual span{background:#fff;border:2px solid #6633b4;padding:16px;border-radius:16px;font-weight:800}.volume-layers{display:flex;flex-wrap:wrap;gap:15px;margin:20px 0}.volume-layers>div{width:100px}.volume-layers>div>div{display:grid;gap:2px;margin-top:6px}.volume-layers i{aspect-ratio:1;background:#713bb8;border:1px solid #382250}.probability-chips{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0}.probability-chips span{display:grid;place-items:center;width:36px;height:36px;color:#fff;border-radius:50%;font-weight:800}.probability-chips .red{background:#ad302e}.probability-chips .blue{background:#1a61a7}.algorithm-chain{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.algorithm-chain>span{background:#fff;border:1px solid #b3a3cc;border-radius:12px;padding:12px;display:grid;gap:7px}.algorithm-chain b{font-size:24px}.algorithm-chain em{font-size:13px;font-style:normal;color:#5a377c}.course-lab .lab-selects button{padding:10px;border-radius:10px;background:#fff;border:1px solid #713bb8;color:#382250}.course-lab .lab-selects button[aria-pressed=true]{background:#713bb8;color:#fff}@media(max-width:500px){.conversion-visual{gap:10px}.conversion-visual span{padding:10px}.course-lab .lab-result{font-size:1.05rem;overflow-wrap:anywhere}}.app-v2 .unit-title{min-width:0}.app-v2 .unit-title>div{min-width:0}.app-v2 .unit-title h1{overflow-wrap:anywhere}.app-v2 .unit-top{min-width:0}.app-v2 .tab-bar{max-width:100%}@media(max-width:600px){.app-v2 .tab-bar button{min-width:0;flex:1}.app-v2 .unit-title{align-items:flex-start}}@media(max-width:600px){.app-v2 .unit-title{flex-direction:column;gap:12px}.app-v2 .unit-title>div{width:100%}.app-v2 .unit-title h1{font-size:clamp(27px,7.6vw,34px)}.app-v2 .favorite-unit{align-self:flex-end;margin-top:0}}@media(max-width:600px){.app-v2 .workspace-header .brand{font-size:17px;gap:7px}.app-v2 .workspace-header .brand-caption{font-size:8px}.app-v2 .workspace-header .brand-mark{width:30px;height:30px}.app-v2 .workspace-header{gap:8px}}@media(max-width:365px){.app-v2 .workspace-header .brand{font-size:14px}.app-v2 .header-course>span{font-size:9px}}@media(max-width:600px){.app-v2 .workspace-header{flex-wrap:wrap;height:auto;min-height:80px;padding-block:12px}.app-v2 .workspace-header .brand{order:0}.app-v2 .workspace-header .account-actions{order:1;margin-left:auto}.app-v2 .workspace-header .header-course{order:2;flex-basis:100%;display:flex;flex-direction:row;justify-content:space-between;align-items:center}.app-v2 .workspace-header .header-course>span{font-size:11px}}