:root{--ink:#173048;--muted:#74838f;--teal:#008d8c;--teal-dark:#007574;--line:#e6ebed;--bg:#f7f9fa;--navy:#132d45;color:var(--ink);background:var(--bg);font-synthesis:none;font-family:Noto Sans JP,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;font-size:14px;line-height:1.65}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;background:0 0;border:0}button:disabled{cursor:not-allowed;opacity:.4}button,a,input,select{outline-offset:4px}:is(button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible){outline:3px solid #04a7a9}button{transition:background .16s,transform .16s,color .16s}button:hover:not(:disabled){filter:brightness(.98)}a{color:inherit}h1,h2,h3,p{margin-top:0}h1{letter-spacing:.015em;margin-bottom:9px;font-size:29px;font-weight:800;line-height:1.55}h2{font-size:21px;line-height:1.6}h3{font-size:17px}p{color:#667984}svg{flex-shrink:0}.app-shell{min-height:100vh}.sidebar{border-right:1px solid var(--line);z-index:20;background:#fff;flex-direction:column;width:240px;padding:34px 20px 18px;display:flex;position:fixed;inset:0 auto 0 0}.brand{letter-spacing:.02em;text-align:left;align-items:center;gap:10px;padding:0 4px;font-size:24px;font-weight:800;display:flex}.brand-mark{color:var(--teal);place-items:center;width:36px;height:39px;display:grid;position:relative}.brand-mark:after{content:"";background:#d8ba68;border-radius:50%;width:7px;height:7px;position:absolute;top:0;right:0}.brand small{color:#83909a;letter-spacing:.13em;margin-top:1px;font-size:10px;font-weight:500;display:block}.sidebar-label{letter-spacing:.16em;color:#9aa8b0;margin:45px 15px 14px;font-size:9px;font-weight:700}.nav-item{text-align:left;color:#687b89;white-space:nowrap;border-radius:8px;align-items:center;gap:13px;width:100%;margin-bottom:7px;padding:13px 15px;font-size:13px;font-weight:600;display:flex}.nav-item:hover{background:#f4f8f8}.nav-item.active{color:#007e7e;background:#e8f5f3}.nav-count{color:#fff;background:#008d8c;border-radius:50%;place-items:center;width:20px;height:20px;margin-left:auto;font-size:11px;display:grid}.sidebar-note{color:#91aaa2;background:#f8faf9;border:1px solid #ecf1ee;border-radius:10px;margin:36px 8px 20px;padding:19px 17px}.sidebar-note strong{color:#546d6a;margin:8px 0;font-size:12px;line-height:1.95;display:block}.sidebar-note p{color:#889a94;margin:0;font-size:10px;line-height:1.9}.sidebar-bottom{margin-top:auto}.sidebar-bottom .nav-item{font-size:12px;font-weight:500}.profile{border-top:1px solid var(--line);text-align:left;align-items:center;gap:9px;width:100%;padding:18px 0 0;display:flex}.profile>svg{margin-left:auto}.avatar{color:#8799a5;background:#edf3f5;border-radius:50%;place-items:center;width:35px;height:35px;display:grid}.profile strong{font-size:12px;display:block}.profile small{color:#97a3ab;font-size:9px;display:block}.main-wrap{margin-left:240px}.demo-banner{color:#84939b;background:#eef3f4;border-bottom:1px solid #e7eded;align-items:center;gap:7px;height:37px;padding:0 40px;font-size:10px;display:flex}.status-dot{background:#a4b4bc;border-radius:50%;width:5px;height:5px}.demo-banner button{align-items:center;gap:4px;margin-left:auto;font-size:10px;display:flex}.banner-detail{color:#9aa6ad}main{outline:none;max-width:1450px;margin:auto;padding:34px 40px 0}.page-title{justify-content:space-between;align-items:flex-end;margin-bottom:27px;display:flex}.eyebrow{letter-spacing:.17em;color:#7b939d;margin-bottom:8px;font-size:9px;font-weight:700;display:block}.page-title p{margin-bottom:0;font-size:12px;line-height:1.9}.small-date{color:#99a7ac;white-space:nowrap;padding-bottom:4px;font-size:10px}.hero{background:#edf6f4;border:1px solid #e2eeeb;border-radius:14px;justify-content:space-between;align-items:center;min-height:290px;margin-bottom:23px;padding:28px 38px;display:flex;position:relative;overflow:hidden}.hero-copy{z-index:1;position:relative}.hero-tag{color:#508d86;background:#fff9;border-radius:20px;align-items:center;gap:6px;margin-bottom:13px;padding:4px 9px;font-size:10px;display:inline-flex}.hero h2{letter-spacing:.07em;margin-bottom:10px;font-size:29px;font-weight:800;line-height:1.65}.hero p{color:#738e90;margin-bottom:18px;font-size:11px;line-height:1.95}.primary,.secondary{border-radius:7px;justify-content:center;align-items:center;gap:11px;min-height:43px;padding:11px 19px;font-size:12px;font-weight:700;line-height:1.6;display:inline-flex}.primary{background:var(--teal);color:#fff;box-shadow:0 3px 8px #008d8c0b}.primary:hover{background:var(--teal-dark)}.secondary{color:#4e6c77;background:#fff;border:1px solid #dce6e7}.hero .primary{min-height:41px;font-size:11px}.hero-diagram{width:44%;max-width:375px;margin-top:15px;position:relative;transform:rotate(-2deg)}.hero-diagram>svg{width:100%;display:block}.floating-label{letter-spacing:.09em;background:#fff;border-radius:4px;padding:5px 12px;font-size:10px;position:absolute;top:-24px;right:20px;box-shadow:0 2px 10px #17344808}.diagram-caption{color:#6d9993;justify-content:center;align-items:center;gap:6px;padding-top:13px;font-size:10px;display:flex}.stats-row{grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:36px;display:grid}.stats-row>div{border:1px solid var(--line);background:#fff;border-radius:10px;align-items:center;gap:14px;padding:18px 22px;display:flex}.stat-icon{color:#359b8c;background:#e8f6f1;border-radius:11px;place-items:center;width:41px;height:41px;display:grid}.stat-icon.amber{color:#c39e51;background:#fcf5e5}.stat-icon.blue{color:#7095bc;background:#edf3fb}.stats-row div div>span{color:#8999a3;font-size:10px;display:block}.stats-row strong{letter-spacing:.02em;font-size:24px;font-weight:700;line-height:1.5}.stats-row strong small{color:#97a4ac;font-size:11px;font-weight:400}.stats-row>div>button{color:#8baba9;margin-left:auto;padding:5px}.section-title{justify-content:space-between;align-items:center;margin-bottom:18px;display:flex}.section-title h2{margin-bottom:3px;font-size:19px}.section-title p{color:#93a1a9;margin-bottom:0;font-size:10px}.count-pill{color:#7b9a93;background:#edf4f1;border-radius:20px;padding:5px 10px;font-size:9px}.filter-panel{gap:12px;margin-bottom:18px;display:flex}.search-box{color:#97a6ad;background:#fff;border:1px solid #e0e7e9;border-radius:7px;flex:1;align-items:center;gap:10px;min-width:0;padding:0 13px;display:flex}.search-box input{outline-offset:-2px;width:100%;height:43px;color:var(--ink);background:0 0;border:0;min-width:0;font-size:11px}.search-box input::placeholder{color:#a0acb3}.select-label{white-space:nowrap;color:#889ba5;align-items:center;gap:10px;font-size:10px;display:flex}.select-label select{color:#596f7f;background:#fff;border:1px solid #e0e7e9;border-radius:7px;max-width:150px;height:44px;padding:0 30px 0 12px;font-size:11px}.unit-tabs{gap:9px;margin-bottom:21px;padding:1px 1px 5px;display:flex;overflow-x:auto}.unit-tabs button{color:#8a9aa3;white-space:nowrap;border:1px solid #0000;border-radius:20px;padding:7px 16px;font-size:11px}.unit-tabs button.active{color:#008985;background:#e7f4f2;border-color:#deeeeb;font-weight:600}.lesson-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 20px;display:grid}.lesson-card{background:#fff;border:1px solid #e4eaec;border-radius:10px;transition:box-shadow .2s,transform .2s;overflow:hidden}.lesson-card:hover{transform:translateY(-2px);box-shadow:0 6px 20px #18384d0a}.lesson-art{text-align:left;color:#508379;background:#e9f3f0;width:100%;height:150px;padding:15px 18px;display:block;position:relative;overflow:hidden}.lesson-art:before{content:"";border:1px solid #fff8;border-radius:50%;width:170px;height:170px;position:absolute;top:5px;right:-60px}.lesson-art:after{content:"";border:1px solid #fff8;border-radius:50%;width:120px;height:120px;position:absolute;top:30px;right:-35px}.lesson-art.blue{color:#6989a8;background:#eaf1f7}.lesson-art.purple{color:#8a81a5;background:#eeedf6}.lesson-art.orange{color:#b19570;background:#f8f0e7}.lesson-art.rose{color:#b28899;background:#f7edf0}.art-label{letter-spacing:.08em;font-size:9px}.art-formula{white-space:nowrap;letter-spacing:.01em;color:#365a67;z-index:1;margin:12px 0 14px;font-family:Georgia,Noto Sans JP,serif;font-size:23px;display:block;position:relative}.lesson-art.purple .art-formula,.lesson-art.orange .art-formula{padding-top:4px;font-size:17px}.art-bottom{letter-spacing:.1em;justify-content:space-between;align-items:center;font-size:8px;display:flex}.round-play{color:#597b7f;background:#fff9;border-radius:50%;place-items:center;width:26px;height:26px;display:grid}.lesson-card-body{padding:15px 17px 11px}.card-meta{color:#8d9ba4;justify-content:space-between;align-items:center;margin-bottom:7px;font-size:9px;display:flex}.card-meta>span{color:#869ba7;background:#f5f7f8;border-radius:3px;padding:2px 6px;font-size:8px}.card-title{text-align:left;margin-bottom:7px;padding:0;font-size:14px;font-weight:700;line-height:1.7;display:block}.lesson-card-body>p{color:#97a4ab;min-height:32px;margin-bottom:16px;font-size:9px;line-height:1.85}.card-footer{border-top:1px solid #eff2f3;justify-content:space-between;align-items:center;padding-top:9px;display:flex}.card-footer>span{color:#95a6ac;align-items:center;gap:5px;font-size:9px;display:flex}.done-mark{color:#119387;align-items:center;gap:2px;margin-left:5px;font-size:8px;display:inline-flex}.icon-button{border-radius:6px;justify-content:center;align-items:center;padding:7px;display:inline-flex}.bookmark-button{color:#a4b2b9}.bookmark-button.active,.big-bookmark.active{color:var(--teal)}footer{color:#a6b2b8;border-top:1px solid #e8edef;justify-content:space-between;align-items:center;margin-top:40px;padding:35px 0 21px;font-size:8px;display:flex}.footer-brand{color:#92a4af;font-size:13px;font-weight:700}.mobile-header,.mobile-only{display:none}.skip-link{z-index:100;background:#fff;padding:10px;position:fixed;top:-80px;left:15px}.skip-link:focus{top:10px}.empty-state{text-align:center;color:#87a6a5;background:#fff9;border:1px dashed #dce6e7;border-radius:12px;flex-direction:column;align-items:center;padding:50px 24px;display:flex}.empty-state h3{color:#3c5f6c;margin:17px 0 9px}.empty-state p{max-width:440px;margin-bottom:22px;font-size:12px;line-height:1.9}.muted{color:#8ba0ab}.padded{margin:0;padding:20px}.text-button{color:#548b8e;align-items:center;gap:7px;padding:8px 0;font-size:12px;font-weight:500;display:inline-flex}.breadcrumb{color:#94a4ae;align-items:center;gap:21px;margin-bottom:24px;font-size:10px;display:flex}.breadcrumb button{color:#687f8d;align-items:center;gap:7px;padding:0;display:flex}.study-layout{grid-template-columns:minmax(0,1fr) 240px;gap:28px;display:grid}.study-heading{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:20px;display:flex}.study-heading h1{margin:0;font-size:27px}.study-heading .eyebrow{letter-spacing:.04em;font-size:10px}.big-bookmark{color:#899da7;background:#fff;border:1px solid #dce5e8}.learning-steps{color:#b0bac0;align-items:center;gap:10px;margin:0 0 18px;font-size:10px;display:flex}.learning-steps button{color:#99a8b0;align-items:center;gap:7px;padding:3px 0;font-size:10px;display:flex}.learning-steps button span{background:#eaf0f1;border-radius:50%;place-items:center;width:20px;height:20px;font-size:9px;display:grid}.learning-steps .current{color:#008985;font-weight:700}.learning-steps .current span{color:#fff;background:#008d8c}.board{color:#eef7fb;background:#142c43;border-radius:12px;position:relative;overflow:hidden;box-shadow:0 6px 20px #0a213210}.board-top{color:#8aa9bd;border-bottom:1px solid #ffffff09;align-items:center;gap:7px;padding:15px 21px;font-size:9px;display:flex}.board-top>span:last-child{color:#7291a6;margin-left:auto;font-size:8px}.board-dot{background:#40bbb2;border-radius:50%;width:5px;height:5px}.board-content{background:radial-gradient(at 85% 15%,#24455b66,#0000 65%);min-height:310px;padding:35px 31px 24px;position:relative}.board-kicker{color:#6ea7b5;letter-spacing:.14em;margin-bottom:19px;font-size:8px}.board-content h2{letter-spacing:.09em;color:#d4e1ea;z-index:1;margin-bottom:32px;font-size:19px;font-weight:500;position:relative}.equation{letter-spacing:.035em;color:#f0ddb0;z-index:1;overflow-wrap:anywhere;margin-bottom:28px;font-family:Georgia,Noto Sans JP,serif;font-size:33px;line-height:1.5;position:relative}.board-note{color:#91b2c4;z-index:1;max-width:90%;margin-bottom:10px;font-size:11px;line-height:1.9;position:relative}.chalk-line{background:linear-gradient(90deg,#4b9faa88,#0000);width:60%;height:1px;transform:rotate(-1deg)}.graph{opacity:.27;width:170px;position:absolute;top:58px;right:7px}.board-controls{color:#d3e4e9;background:#0c2032;align-items:center;gap:10px;padding:11px 15px;display:flex}.board-controls>span{white-space:nowrap;color:#95b0bf;font-size:9px}.slide-dots{flex:1;gap:4px;margin:0 7px;display:flex}.slide-dots button{background:#3d5364;border-radius:3px;flex:1;height:5px;padding:0}.slide-dots .filled{background:#12b1ac}.board-controls .icon-button{padding:4px}.watch-caption{padding:21px 0 22px}.watch-caption p{color:#80949f;margin-bottom:18px;font-size:12px}.watch-caption .primary{justify-content:space-between;width:100%;min-height:49px;padding-left:22px;padding-right:20px;font-size:14px}.point-box{color:#039b9e;background:#eef4f5;border-radius:9px;align-items:flex-start;gap:13px;padding:21px;display:flex}.point-box strong{color:#547080;font-size:12px}.point-box p{color:#375b70;margin:9px 0 0;font-size:15px;line-height:1.85}.study-aside{padding-top:92px}.aside-card{background:#fff;border:1px solid #e4ebed;border-radius:10px;margin-bottom:18px;padding:23px 21px}.aside-card h3{margin:12px 0;font-size:16px;line-height:1.9}.aside-card p{color:#8b9da7;font-size:11px;line-height:1.95}.aside-card ul{margin:22px 0 0;padding:0;list-style:none}.aside-card li{color:#7a949e;align-items:center;gap:8px;margin-top:13px;font-size:10px;display:flex}.aside-card li svg{color:#8bb3ab}.aside-card .related{text-align:left;border-bottom:1px solid #edf1f2;justify-content:space-between;align-items:center;gap:9px;width:100%;padding:12px 0;font-size:11px;line-height:1.8;display:flex}.aside-card .text-button{margin-top:10px;font-size:10px}.collapsed-board{color:#d3e4e9;text-align:left;background:#142c43;border-radius:9px;align-items:center;gap:15px;width:100%;margin-bottom:22px;padding:16px 19px;display:flex}.mini-formula{color:#d9cda9;white-space:nowrap;text-overflow:ellipsis;border-right:1px solid #3d5061;max-width:34%;padding-right:15px;font-family:Georgia,serif;font-size:15px;overflow:hidden}.collapsed-board strong{font-size:12px;font-weight:500;display:block}.collapsed-board small{color:#86a1b1;font-size:9px;display:block}.collapsed-board>svg{margin-left:auto}.question-panel{background:#fff;border:1px solid #e2eaec;border-radius:10px;padding:28px}.section-overline{color:#97a7b0;letter-spacing:.11em;justify-content:space-between;gap:10px;margin-bottom:15px;font-size:8px;display:flex}.section-overline>span:last-child{letter-spacing:0;color:#79a3a2}.question-panel h2{margin-bottom:22px;font-size:21px}.question-text{color:#365769;margin-bottom:30px;font-size:17px;line-height:2}.question-panel label{color:#788f9b;margin-bottom:8px;font-size:11px;display:block}.answer-row{gap:10px;display:flex}.answer-row input{color:#173e50;background:#fbfdfd;border:1px solid #cbdde1;border-radius:7px;flex:1;width:100%;min-width:0;padding:10px 15px;font-size:21px}.answer-row input::placeholder{color:#b0bfc4;font-size:14px}.answer-row .primary{white-space:nowrap}.math-keypad{align-items:center;gap:6px;margin:12px 0 24px;display:flex}.math-keypad button{color:#5f7a89;background:#f8fafb;border:1px solid #e2e9eb;border-radius:4px;width:32px;height:31px;font-size:17px}.math-keypad span{color:#a3b0b7;margin-left:6px;font-size:8px}.hint-button{margin-right:18px}.hint{color:#9c854d;background:#fff9e8;border-radius:6px;margin:3px 0 16px;padding:14px;font-size:12px}.result{border-radius:8px;gap:12px;margin:0 0 15px;padding:18px;display:flex}.result.correct{color:#24977d;background:#eaf7f1}.result.incorrect{color:#b89453;background:#fff6e8}.result strong{font-size:13px}.result p{color:inherit;margin:5px 0;font-size:10px}.result button{align-items:center;gap:6px;padding:6px 0;font-size:11px;font-weight:700;display:flex}.correct-answer{background:#edf7f3;border-radius:8px;flex-wrap:wrap;align-items:center;gap:20px;margin-bottom:25px;padding:20px;display:flex}.correct-answer>span{color:#4c9a86;font-size:11px}.correct-answer strong{color:#007e79;font-family:Georgia,serif;font-size:30px}.correct-answer small{color:#81a097;width:100%;font-size:11px}.explanation-steps{margin:0 0 25px;padding:0;list-style:none}.explanation-steps li{align-items:flex-start;gap:13px;margin-bottom:19px;display:flex}.explanation-steps li>span{color:#6b989a;background:#edf4f4;border-radius:50%;flex-shrink:0;place-items:center;width:25px;height:25px;font-size:11px;display:grid}.explanation-steps p{color:#5f7b8b;margin:0;font-size:13px;line-height:1.9}.button-row{flex-wrap:wrap;gap:12px;margin-top:23px;display:flex}.board-overlay{z-index:100;background:#081927f7;place-items:center;padding:28px;display:grid;position:fixed;inset:0}.wide-board{width:min(1100px,100%);max-height:94vh;overflow:auto}.wide-board .board-content{min-height:55vh;padding:5vh 7vw}.wide-board .board-content h2{font-size:28px}.wide-board .equation{font-size:clamp(30px,5vw,60px)}.wide-board .board-note{font-size:17px}.wide-board .graph{width:300px;right:6%}.wide-board .board-controls{padding:15px 24px}.close-board{z-index:3;color:#b3cbd6;background:#193b53;position:absolute;top:7px;right:7px}.wide-board .board-top{padding-right:53px}.review-summary{color:#389d8f;background:#edf6f3;border:1px solid #e0eeea;border-radius:11px;align-items:center;gap:21px;margin-bottom:28px;padding:26px;display:flex}.review-summary h2{color:#365f67;margin-bottom:4px}.review-summary p{color:#8ba29f;margin:0;font-size:11px}.review-summary .primary{white-space:nowrap;margin-left:auto}.subsection-title{margin:35px 0 16px;font-size:18px}.list-panel{background:#fff;border:1px solid #e3eaed;border-radius:10px;overflow:hidden}.list-row{text-align:left;border-bottom:1px solid #edf1f2;align-items:center;gap:14px;width:100%;padding:21px;font-size:13px;display:flex}.list-row:last-child{border-bottom:0}.list-row small{color:#96a8b0;margin-left:auto;font-size:10px}.course-grid{grid-template-columns:1fr 1fr;gap:25px;display:grid}.course-card{background:#fff;border:1px solid #e2eaec;border-radius:12px;overflow:hidden}.course-cover{color:#7da69d;background:#e9f3f1;justify-content:space-between;align-items:center;height:155px;padding:32px 35px;display:flex}.course-cover>span{color:#d0e4de;font:75px Georgia,serif}.cover-1{color:#8a9fbc;background:#ecf0f7}.cover-1>span{color:#d4deee}.course-body{padding:25px}.course-body h2{margin:12px 0;font-size:20px}.course-body p{margin-bottom:23px;font-size:12px}.course-meta{color:#8ea1ab;justify-content:space-between;margin-bottom:18px;font-size:10px;display:flex}.course-body .primary{justify-content:space-between;width:100%}.footnote{color:#9aa9af;margin-top:23px;font-size:10px;line-height:1.9}.course-detail{background:#fff;border:1px solid #e2eaec;border-radius:10px;margin-top:17px;padding:28px}.course-detail>p{margin-bottom:28px;font-size:12px}.course-lesson{text-align:left;border-top:1px solid #edf1f2;align-items:center;gap:17px;width:100%;padding:19px 0;display:flex}.step-number{color:#8099a4;background:#f1f5f6;border-radius:9px;place-items:center;width:42px;height:42px;font-size:15px;display:grid}.step-number.done{color:#4d9e89;background:#e6f5ee}.course-lesson small{color:#92a3ad;font-size:10px;display:block}.course-lesson strong{font-size:14px;font-weight:600}.course-status{color:#82a19d;margin-left:auto;font-size:10px}.history-stats{grid-template-columns:repeat(3,1fr);gap:18px;display:grid}.history-stats>div{background:#fff;border:1px solid #e3ebed;border-radius:10px;padding:25px}.history-stats span{color:#8a9da8;font-size:11px;display:block}.history-stats strong{color:#3f697c;font-size:36px;font-weight:500}.history-stats small{color:#a1b0b8;font-size:12px}.history-row{text-align:left;border-bottom:1px solid #edf1f3;align-items:center;gap:14px;width:100%;padding:20px 23px;display:flex}.history-row:last-child{border:0}.history-result{border-radius:50%;place-items:center;width:35px;height:35px;display:grid}.history-result.yes{color:#5ea18c;background:#eaf6ef}.history-result.no{color:#bea168;background:#fff5e5}.history-row strong{font-size:13px;display:block}.history-row small{color:#99a9b0;margin-top:3px;font-size:9px;display:block}.history-word{color:#8ba29e;white-space:nowrap;margin-left:auto;font-size:10px}.settings-panel{background:#fff;border:1px solid #e2eaec;border-radius:11px;max-width:900px;margin-bottom:22px;padding:28px}.settings-panel h2{align-items:center;gap:12px;font-size:18px;display:flex}.settings-panel p{font-size:12px;line-height:1.9}.settings-panel>.secondary{margin-top:15px;margin-right:12px}.notice{color:#82969e;background:#f3f7f7;border:1px solid #e8efef;border-radius:7px;padding:17px 19px;font-size:11px;line-height:1.85}.notice strong{color:#67828b;margin-bottom:5px;display:block}.notice p{color:#82969e;margin:0;font-size:11px}.alert{border-radius:7px;justify-content:space-between;align-items:center;margin-bottom:20px;padding:12px 17px;font-size:12px;display:flex}.error{color:#aa6157;background:#fff0ee;border:1px solid #f3dcd8}.toast{color:#fff;z-index:110;background:#1e4b50;border-radius:9px;align-items:center;gap:10px;max-width:calc(100vw - 30px);padding:15px 20px;font-size:12px;display:flex;position:fixed;bottom:25px;left:calc(50% + 100px);transform:translate(-50%);box-shadow:0 7px 22px #112d4520}.modal-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:90;background:#112b4566;place-items:center;padding:25px;display:grid;position:fixed;inset:0}.modal{text-align:center;background:#fff;border-radius:18px;max-width:450px;padding:35px;position:relative;box-shadow:0 15px 70px #10283822}.modal-close{color:#94a5ae;position:absolute;top:12px;right:12px}.modal-icon{color:#459a8d;background:#eaf5f2;border-radius:50%;place-items:center;width:65px;height:65px;margin:0 auto 22px;display:grid}.modal h2{font-size:21px}.modal>p{font-size:12px;line-height:1.9}.modal .notice{text-align:left;margin:23px 0}.full-width{width:100%}.modal>.text-button{margin-top:12px}@media (min-width:1450px){main{padding:42px 65px 0}.hero{min-height:310px}.lesson-art{height:175px}.hero-diagram{max-width:420px}.hero h2{font-size:32px}.lesson-grid{gap:26px}.lesson-card-body{padding:18px 20px 13px}.card-title{font-size:16px}.lesson-card-body>p{font-size:11px}.study-layout{grid-template-columns:minmax(0,1fr) 275px}.board-content{min-height:355px}.equation{font-size:39px}}@media (max-width:1150px){.sidebar{width:205px;padding-left:14px;padding-right:14px}.brand{font-size:21px}.main-wrap{margin-left:205px}main{padding:27px 26px 0}.demo-banner{padding:0 26px}.small-date{display:none}h1{font-size:24px}.hero{padding:26px}.hero h2{font-size:25px}.stats-row{gap:10px}.stats-row>div{gap:10px;padding:14px}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-art{height:155px}.study-layout{grid-template-columns:1fr}.study-aside{display:none}.hero-diagram{width:43%}.hero-diagram>svg{opacity:.9}.study-heading h1{font-size:26px}.review-summary{gap:13px}.review-summary h2{font-size:18px}.review-summary .primary{padding:10px;font-size:10px}.review-summary p{font-size:9px}}@media (max-width:800px){.sidebar{width:185px;padding:28px 11px 15px}.brand{gap:5px;font-size:18px}.brand-mark{width:31px}.brand small{font-size:8px}.sidebar-label{margin-top:35px;font-size:8px}.nav-item{gap:10px;padding:12px 11px;font-size:11px}.sidebar-note{margin:25px 0 15px;padding:15px}.sidebar-note strong{font-size:11px}.profile small{font-size:8px}.main-wrap{margin-left:185px}main{padding:24px 21px 0}.demo-banner{padding:0 21px}.banner-detail{display:none}.hero{min-height:265px;padding:23px}.hero h2{font-size:23px}.hero-diagram{opacity:.4;width:48%;position:absolute;top:60px;right:-30px}.hero-copy{z-index:2}.hero-diagram .floating-label,.diagram-caption{display:none}.hero p{font-size:10px}.stats-row>div{gap:6px;padding:12px 10px}.stat-icon{border-radius:7px;width:30px;height:33px}.stat-icon svg{width:16px}.stats-row div div>span{font-size:8px}.stats-row strong{font-size:19px}.stats-row strong small{font-size:8px}.stats-row>div>button{display:none}.filter-panel{flex-wrap:wrap;gap:9px}.search-box{flex-basis:100%;width:100%}.select-label{flex:1}.select-label select{flex:1;max-width:none}.lesson-grid{gap:15px}.lesson-art{height:135px;padding:13px}.art-formula{font-size:20px}.lesson-art.purple .art-formula,.lesson-art.orange .art-formula{font-size:14px}.lesson-card-body{padding:13px}.card-title{font-size:12px}.lesson-card-body>p{font-size:9px}.count-pill{display:none}.page-title h1{font-size:22px}.page-title p{font-size:11px}.course-grid{grid-template-columns:1fr}.review-summary{flex-wrap:wrap}.review-summary .primary{margin-left:0}.history-stats{gap:9px}.history-stats>div{padding:15px}.history-stats span{font-size:9px}.history-stats strong{font-size:27px}.history-row{padding:15px}.history-row strong{font-size:11px}.history-word{display:none}.toast{left:calc(50% + 70px)}.question-panel{padding:23px}.question-panel h2{font-size:19px}.question-text{font-size:16px}}@media (max-width:620px){.mobile-header{border-bottom:1px solid var(--line);z-index:40;background:#fff;justify-content:space-between;align-items:center;height:65px;padding:0 19px;display:flex;position:sticky;top:0}.mobile-header .brand{gap:7px;font-size:23px}.mobile-header>.icon-button{color:#697f8d}.sidebar{width:100%;max-height:calc(100vh - 65px);padding:18px 22px;display:none;top:65px;bottom:auto;overflow-y:auto;box-shadow:0 20px 30px #152e4520}.sidebar.is-open{display:flex}.sidebar>.brand,.sidebar-label,.sidebar-note{display:none}.sidebar .nav-item{padding:12px;font-size:13px}.sidebar-bottom .profile{max-width:350px}.main-wrap{margin-left:0}.demo-banner{height:31px;padding:0 19px;font-size:9px}.demo-banner button{font-size:9px}.banner-detail{font-size:8px;display:inline}.main-wrap main{padding:25px 19px 0}.page-title{margin-bottom:22px}.eyebrow{margin-bottom:7px;font-size:8px}.page-title h1{letter-spacing:0;font-size:23px;line-height:1.65}.page-title p{max-width:290px;font-size:10px;line-height:1.95}.hero{border-radius:12px;min-height:278px;margin-bottom:16px;padding:25px 23px}.hero h2{letter-spacing:.025em;font-size:27px}.hero p{margin-bottom:18px;font-size:10px}.hero-tag{font-size:8px}.hero-diagram{opacity:.35;width:50%;top:85px;right:-26px}.hero .primary{font-size:11px}.stats-row{gap:7px;margin-bottom:30px}.stats-row>div{text-align:center;padding:12px 8px;display:block}.stat-icon{width:28px;height:28px;margin:0 auto 5px}.stats-row div div>span{font-size:8px}.stats-row strong{font-size:22px}.stats-row strong small{font-size:9px}.section-title h2{font-size:18px}.section-title p{margin-top:4px;font-size:9px}.section-title{margin-bottom:16px}.filter-panel{gap:10px}.search-box input{height:43px;font-size:11px}.select-label{gap:9px;font-size:10px}.select-label select{min-width:0;height:38px;padding:0 10px;font-size:10px}.unit-tabs{gap:4px;margin-bottom:16px}.unit-tabs button{padding:6px 12px;font-size:10px}.lesson-grid{gap:15px 12px}.lesson-art{height:125px;padding:12px}.art-label{font-size:8px}.art-formula{margin:11px 0 14px;font-size:17px}.lesson-art.purple .art-formula,.lesson-art.orange .art-formula{margin:12px 0 14px;font-size:11px}.art-bottom{font-size:7px}.round-play{width:22px;height:22px}.round-play svg{width:11px}.lesson-card-body{padding:11px 11px 8px}.card-meta{margin-bottom:6px;font-size:8px}.card-meta>span{padding:1px 4px;font-size:7px}.card-title{font-size:12px;line-height:1.8}.lesson-card-body>p{min-height:29px;margin-bottom:11px;font-size:8px;line-height:1.8}.card-footer>span{gap:3px;font-size:8px}.card-footer>span>svg{width:12px}.done-mark{gap:0;margin-left:2px;font-size:7px}.done-mark svg{width:10px}.bookmark-button{padding:4px}.bookmark-button svg{width:16px}footer{gap:12px;margin-top:32px;padding:25px 0;font-size:7px}.footer-brand{font-size:12px}.mobile-only{display:block}.breadcrumb{justify-content:space-between;gap:10px;margin-bottom:19px;font-size:8px}.breadcrumb button{white-space:nowrap;font-size:10px}.breadcrumb>span{text-align:right}.study-heading h1{font-size:24px}.study-heading .eyebrow{font-size:9px}.big-bookmark{padding:7px}.big-bookmark svg{width:20px}.learning-steps{justify-content:space-between;gap:7px;margin-bottom:15px}.learning-steps button{gap:5px;font-size:9px}.learning-steps>svg{width:12px}.learning-steps button span{width:18px;height:18px;font-size:8px}.board{border-radius:9px}.board-top{padding:11px 14px;font-size:8px}.board-top>span:last-child{font-size:7px}.board-content{min-height:270px;padding:25px 21px 18px}.board-kicker{margin-bottom:20px;font-size:7px}.board-content h2{letter-spacing:.03em;margin-bottom:32px;font-size:17px}.equation{margin-bottom:30px;font-size:27px}.board-note{max-width:100%;font-size:10px}.graph{opacity:.19;width:130px;top:50px;right:4px}.board-controls{gap:6px;padding:10px 11px}.board-controls>span{font-size:8px}.board-controls .icon-button svg{width:16px}.slide-dots{margin:0 3px}.watch-caption{padding:18px 0}.watch-caption p{font-size:11px}.point-box{gap:10px;padding:19px 16px}.point-box strong{font-size:11px}.point-box p{font-size:14px}.question-panel{padding:20px 17px}.question-panel h2{font-size:18px}.section-overline{font-size:7px}.question-text{margin-bottom:25px;font-size:16px;line-height:2}.answer-row{flex-direction:column;gap:11px}.answer-row input{height:52px}.answer-row .primary{min-height:47px}.math-keypad{flex-wrap:wrap;gap:7px;margin-bottom:18px}.math-keypad span{width:100%;margin-top:3px;margin-left:0}.question-panel .text-button{font-size:10px}.collapsed-board{gap:10px;padding:13px 14px}.mini-formula{max-width:28%;padding-right:10px;font-size:12px}.collapsed-board strong{font-size:11px}.collapsed-board small{font-size:8px}.collapsed-board>svg{width:17px}.correct-answer{padding:16px}.correct-answer strong{font-size:27px}.explanation-steps p{font-size:12px}.button-row{gap:9px}.button-row .primary,.button-row .secondary{white-space:nowrap;flex:1;padding:11px 10px;font-size:11px}.explanation .point-box p{font-size:12px}.review-summary{gap:13px;padding:20px}.review-summary>svg{width:25px}.review-summary h2{font-size:18px}.review-summary p{max-width:240px;font-size:9px}.review-summary .primary{width:100%;margin-top:7px;font-size:12px}.empty-state{padding:40px 18px}.empty-state h3{font-size:16px}.empty-state p{font-size:11px}.subsection-title{font-size:17px}.list-row{gap:8px;padding:16px;font-size:11px}.list-row small{font-size:8px}.course-cover{height:140px}.course-body{padding:22px}.course-body h2{font-size:20px}.course-detail{padding:20px 17px}.course-detail h2{font-size:20px}.course-lesson{gap:10px}.course-lesson strong{font-size:12px}.course-lesson small{font-size:8px}.step-number{width:34px;height:36px;font-size:12px}.course-status{display:none}.course-lesson>svg{margin-left:auto}.history-stats{gap:8px}.history-stats>div{padding:16px 10px}.history-stats span{font-size:8px}.history-stats strong{font-size:27px}.history-stats small{font-size:9px}.history-row{gap:10px;padding:16px 13px}.history-result{width:29px;height:29px}.history-row strong{font-size:11px}.history-row small{font-size:8px}.history-row>svg:last-child{width:14px;margin-left:auto}.settings-panel{padding:22px 19px}.settings-panel h2{font-size:17px}.settings-panel p,.settings-panel .secondary{font-size:11px}.notice{padding:15px;font-size:10px}.settings-panel .button-row{flex-direction:column}.toast{width:max-content;min-width:290px;padding:13px 17px;font-size:11px;bottom:18px;left:50%}.modal{padding:32px 23px 25px}.modal h2{font-size:19px}.modal>p{font-size:11px}.board-overlay{padding:10px}.wide-board .board-content{min-height:60vh;padding:35px 25px}.wide-board .board-content h2{font-size:23px}.wide-board .equation{font-size:31px}.wide-board .board-note{font-size:13px}.wide-board .graph{width:180px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.sound-toggle-row{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;margin-bottom:19px;padding:14px 0 20px;display:flex}.sound-toggle-row strong{font-size:13px;display:block}.sound-toggle-row span{color:#879da7;font-size:10px}.sound-switch{background:#d5e0e3;border-radius:20px;align-items:center;width:46px;height:27px;padding:3px;display:flex}.sound-switch>span{background:#fff;border-radius:50%;width:21px;height:21px;transition:transform .15s;box-shadow:0 1px 3px #18384d15}.sound-switch.on{background:var(--teal)}.sound-switch.on>span{transform:translate(19px)}.sound-volume-label{color:#617e8b;justify-content:space-between;max-width:420px;font-size:12px;display:flex}.sound-volume{color:#8aa1aa;align-items:center;gap:13px;max-width:420px;margin-top:10px;display:flex}.sound-volume input{width:100%;accent-color:var(--teal)}.sound-previews{margin-top:18px}.sound-previews .secondary{font-size:11px}.narration-voice-label{color:#617e8b;justify-content:space-between;align-items:center;max-width:420px;margin-bottom:22px;font-size:12px;display:flex}.narration-voice-label select{color:var(--ink);background:#fff;border:1px solid #dbe6e8;border-radius:6px;min-width:160px;padding:8px 30px 8px 12px}.narration-stop{z-index:85;color:#fff;background:#173e50;border-radius:30px;align-items:center;gap:8px;padding:11px 16px;font-size:11px;display:flex;position:fixed;bottom:22px;right:20px;box-shadow:0 4px 18px #10283824}.narration-stop:focus-visible{outline:3px solid #31c7bf}.mini-formula small{letter-spacing:.04em;color:#86a1b1;margin-bottom:2px;font-family:inherit;font-size:8px;line-height:1.6;display:block}.explanation-question{background:#f6f9fa;border:1px solid #e6edef;border-radius:7px;margin:-5px 0 22px;padding:15px 17px}.explanation-question>span{color:#819ba7;font-size:10px;font-weight:600}.explanation-question p{color:#4c6b7d;margin:6px 0 0;font-size:13px;line-height:1.95}.learning-preferences{flex-wrap:wrap;gap:16px;margin:20px 0;display:flex}.learning-preferences label{flex-direction:column;flex:240px;gap:8px;font-weight:600;display:flex}.learning-preferences select{width:100%;min-height:48px;color:inherit;font:inherit;background:#fff;border:1px solid #d2ddd9;border-radius:10px;padding:10px}.learning-preferences .footnote{flex-basis:100%;margin:0}.first-learning-panel h1{font-size:clamp(24px,3vw,32px);line-height:1.5}.first-learning-panel .primary{white-space:normal;text-align:left}.reflection-panel{background:#f5f8f6;border-radius:14px;margin:20px 0;padding:20px}.reflection-panel h3{margin-top:0}.reflection-panel label{margin:16px 0 8px;display:block}.reflection-panel textarea{resize:vertical;width:100%;min-height:90px;font:inherit;border:1px solid #ccd8d4;border-radius:8px;padding:12px}.reflection-panel button[aria-pressed=true]{background:#dcefe7;border-color:#197b67}.explanation-details summary{cursor:pointer;padding:16px 0;font-weight:600}.lesson-check{border-bottom:1px solid var(--border,#dce3e5);padding:.8rem 0}.lesson-check summary{cursor:pointer;font-weight:600;line-height:1.7}.lesson-check p{line-height:1.8}.workspace{--module-size:12px}.workspace-heading{justify-content:space-between;align-items:flex-end;gap:22px;margin-bottom:22px;display:flex}.workspace-heading h1{font-size:28px}.workspace-heading p{margin:0;font-size:11px;line-height:1.9}.workspace-heading>.secondary{white-space:nowrap;flex-shrink:0}.workspace-data-banner{color:#668a82;background:#edf4f2;border:1px solid #dfebe7;border-radius:7px;justify-content:space-between;align-items:center;gap:15px;margin-bottom:25px;padding:11px 15px;font-size:10px;display:flex}.workspace-data-banner button{align-items:center;gap:5px;font-size:10px;font-weight:600;display:flex}.workspace-data-banner.sample{color:#a08745;background:#fff7e8;border-color:#f1e4c3}.workspace-notice{background:#edf5f8;border-radius:7px;justify-content:space-between;align-items:center;padding:12px;font-size:11px;display:flex}.dashboard-summary{color:#94a5ae;justify-content:space-between;gap:12px;margin-bottom:17px;font-size:10px;display:flex}.modules-grid{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:21px;display:grid}.workspace-module{background:#fff;border:1px solid #e0e9ec;border-radius:12px;min-width:0;padding:23px 24px;box-shadow:0 3px 12px #183b4b03}.workspace-module>header{border-bottom:1px solid #edf2f3;justify-content:space-between;align-items:flex-start;gap:15px;margin-bottom:19px;padding-bottom:15px;display:flex}.workspace-module>header>div>span{color:#8ca6a6;letter-spacing:.05em;font-size:9px;display:block}.workspace-module header i{color:#b0bdc1;margin-left:6px;font-style:normal}.workspace-module h2{margin:5px 0 0;font-size:17px;line-height:1.6}.workspace-module header>button{color:#afbdc3;padding:3px}.workspace-module header>button:hover{color:#6d9594;background:#eff5f5}.workspace-module p{font-size:var(--module-size);color:#73909a;line-height:1.85}.workspace-module h4{margin:12px 0 17px;font-size:15px;font-weight:600;line-height:1.9}.module-note{margin:15px 0 0;line-height:1.85;display:block;color:#98aab1!important;font-size:10px!important}.module-empty{color:#9aafb6;text-align:center;background:#f8fafb;border:1px dashed #e1e9eb;border-radius:7px;margin:0;padding:20px;font-size:12px;line-height:2}.module-stat-row{justify-content:space-around;gap:20px;display:flex}.module-stat strong{color:#326978;letter-spacing:.01em;font-size:35px;font-weight:600;line-height:1.5;display:block}.module-stat span{color:#8ca1ab;font-size:10px;display:block}.module-stat{text-align:center;padding:4px 0 12px}.module-actions{flex-wrap:wrap;align-items:center;gap:9px;margin-top:15px;display:flex}.module-actions .primary,.module-actions .secondary,.workspace-module>.primary{min-height:37px;padding:9px 13px;font-size:11px}.module-actions.compact{gap:15px;margin:0 0 15px}.module-form{flex-direction:column;gap:13px;margin-top:16px;display:flex}.module-form label,.module-quiz form label{color:#7c949f;flex-direction:column;gap:6px;font-size:11px;display:flex}.workspace-module input:not([type=checkbox]):not([type=range]),.workspace-module select,.workspace-module textarea{color:#3e6172;font:inherit;background:#fbfdfd;border:1px solid #dce7e9;border-radius:6px;min-width:0;max-width:100%;padding:9px 11px;font-size:12px}.workspace-module input[type=checkbox]{accent-color:#008d8c;flex-shrink:0;width:15px;height:15px}.workspace-module textarea{resize:vertical;width:100%;line-height:1.8}.module-select{color:#7b929d;flex-direction:column;gap:7px;margin:13px 0;font-size:11px;display:flex}.inline-check{color:#76929d;cursor:pointer;align-items:center;gap:7px;font-size:11px;display:inline-flex}.module-lesson-list{flex-direction:column;gap:0;display:flex}.module-lesson-list>button,.module-lesson-list>.bookmark-row{text-align:left;border-bottom:1px solid #edf2f3;justify-content:space-between;align-items:center;gap:12px;width:100%;padding:13px 0;display:flex}.module-lesson-list>button:first-child{padding-top:0}.module-lesson-list>button:last-child{border-bottom:0}.module-lesson-list strong{color:#4e7180;font-size:12px;font-weight:600;display:block}.module-lesson-list small{color:#9aadb4;margin-bottom:2px;font-size:9px;display:block}.module-lesson-list svg{color:#9ab3b7}.mini-timeline{flex-direction:column;gap:13px;display:flex}.mini-timeline>button{text-align:left;align-items:center;gap:11px;padding:0;display:flex}.mini-timeline strong{font-size:11px;font-weight:500;display:block}.mini-timeline small{color:#9badb5;margin-top:3px;font-size:9px;display:block}.correct-dot,.retry-dot{border-radius:50%;flex-shrink:0;place-items:center;width:28px;height:28px;font-size:14px;display:grid}.correct-dot{color:#4a9e85;background:#e8f5ef}.retry-dot{color:#c3a460;background:#fff5e5}.segmented{background:#f0f5f6;border-radius:6px;gap:4px;width:max-content;max-width:100%;margin:14px 0;padding:3px;display:flex}.segmented button{color:#8aa1aa;border-radius:4px;padding:6px 14px;font-size:10px}.segmented button.active{color:#388e8e;background:#fff;box-shadow:0 1px 4px #224c5610}.daily-bars{align-items:flex-end;gap:8px;height:150px;margin-top:18px;display:flex}.daily-bars>div{color:#8fa5ae;flex-direction:column;flex:1;align-items:center;gap:5px;min-width:0;height:100%;font-size:9px;display:flex}.bar-track{background:#f0f6f5;border-radius:4px;width:100%;height:100%;position:relative;overflow:hidden}.bar-track i{background:#84bfb5;border-radius:4px;width:100%;min-height:1px;position:absolute;bottom:0}.daily-bars small{font-size:8px}.calendar-grid{grid-template-columns:repeat(7,1fr);gap:5px;margin-top:15px;display:grid}.calendar-grid>span{text-align:center;color:#a5b2b9;padding:5px;font-size:9px}.calendar-grid button{color:#9aadb6;background:#f6f8f9;border-radius:5px;padding:6px 0;font-size:11px}.calendar-grid button.studied{color:#42907e;background:#dff1eb;font-weight:600}.calendar-grid button.selected{outline-offset:0;outline:2px solid #229d97}.metric-list{flex-direction:column;gap:16px;display:flex}.metric-list>div{grid-template-columns:1fr auto;gap:5px;display:grid}.metric-list span{color:#658491;font-size:11px}.metric-list strong{color:#4c8083;font-size:12px}.metric-list small{color:#a0b1b7;text-align:right;grid-column:1/-1;font-size:9px}.meter{background:#ecf2f3;border-radius:8px;grid-column:1/-1;height:6px;margin-top:4px;overflow:hidden}.meter i{background:#80bcb1;border-radius:8px;max-width:100%;height:100%;display:block}.progress-ring{text-align:center;padding:3px 0 17px}.progress-ring strong{color:#428a8b;font-size:39px}.progress-ring small{color:#a0b7bc;font-size:17px;font-weight:400}.progress-ring>span{color:#8da3ad;font-size:10px;display:block}.completion-chips{flex-wrap:wrap;gap:7px;margin-top:18px;display:flex}.completion-chips button{color:#a0afb6;background:#f4f7f8;border-radius:5px;padding:6px 8px;font-size:9px}.completion-chips button.done{color:#549981;background:#e6f4ed}.badge-grid{grid-template-columns:repeat(2,1fr);gap:9px;display:grid}.badge-grid>div{text-align:center;color:#bac6cb;background:#f8fafb;border:1px solid #edf1f2;border-radius:8px;padding:14px 8px}.badge-grid>div.earned{color:#bea359;background:#f7f5e9;border-color:#ece7d2}.badge-grid span{font-size:27px;line-height:1.3}.badge-grid strong{margin:7px 0 3px;font-size:10px;font-weight:500;display:block}.badge-grid small{font-size:8px;display:block}.weak-unit{border-bottom:1px solid #edf2f2;flex-wrap:wrap;align-items:center;gap:9px;padding:12px 0;display:flex}.weak-unit>strong{font-size:12px}.weak-unit small{color:#9fadb4;margin-left:auto;font-size:9px}.weak-unit .text-button{width:100%;padding:0;font-size:10px}.mistake-list>div{border-bottom:1px solid #edf1f2;margin-bottom:16px;padding-bottom:14px}.mistake-list .text-button{padding:0;font-size:11px}.mistake-list small{color:#a4b4bb;margin:5px 0 8px;font-size:8px;display:block}.rating-picker{justify-content:space-between;gap:8px;margin:23px 0 12px;display:flex}.rating-picker button{color:#a1b5bd;background:#f0f5f6;border-radius:7px;flex:1;height:45px;font-size:18px}.rating-picker button.active{color:#318d7e;background:#dff1eb;box-shadow:inset 0 0 0 1px #b5d8ce}.before-after{grid-template-columns:1fr 1fr;gap:12px;margin-top:18px;display:grid}.before-after>div{background:#f5f9f9;border-radius:8px;padding:16px 12px}.before-after small{color:#96aab3;font-size:9px;display:block}.before-after strong{color:#588c91;margin:8px 0;font-size:17px;display:block}.before-after p{overflow-wrap:anywhere;margin:0;font-size:11px}.card-list{grid-template-columns:1fr;gap:10px;max-height:320px;display:grid;overflow:auto}.mini-flashcard{border:1px solid #e1eaeb;border-radius:8px;overflow:hidden}.card-flip{text-align:left;background:#f8fbfa;width:100%;min-height:90px;padding:17px;display:block}.card-flip small{color:#9bb0b4;margin-bottom:9px;font-size:9px;display:block}.card-flip strong{white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px;font-weight:500;line-height:1.8}.card-tools{color:#8ba5ad;border-top:1px solid #edf2f2;justify-content:flex-end;align-items:center;gap:12px;padding:8px 12px;display:flex}.card-tools>.inline-check{margin-right:auto;font-size:9px}.card-tools>button{padding:3px}.flashcard{text-align:center;background:#f2f8f5;border:1px solid #e1eee8;border-radius:9px;flex-direction:column;align-items:center;gap:20px;min-height:180px;margin-top:16px;padding:24px 18px;display:flex}.flashcard>small{color:#91aaa3;font-size:10px}.flashcard>strong{overflow-wrap:anywhere;white-space:pre-wrap;font-size:18px;line-height:1.9}.flashcard .secondary{font-size:11px}.bookmark-row>button:first-child{text-align:left;flex:1;justify-content:space-between;align-items:center;gap:12px;font-size:12px;display:flex}.bookmark-row>button:last-child{color:#72aaa2;padding:5px}.draft-preview{overflow-wrap:anywhere;background:#f5f8f9;border-radius:5px;padding:10px;font-size:12px!important}.task-list{flex-direction:column;gap:13px;display:flex}.task-list>div{align-items:center;gap:7px;display:flex}.task-list label{color:#6e8b98;align-items:center;gap:9px;font-size:12px;line-height:1.8;display:flex}.task-list>div>label{overflow-wrap:anywhere;flex:1;min-width:0}.task-list>div>button{color:#a5b8c0}.crossed{color:#b0bec5;text-decoration:line-through}.inline-form{gap:7px;margin-top:17px;display:flex}.inline-form input{flex:1;min-width:0}.inline-form .primary{min-height:36px;padding:7px 11px}.check-chips{flex-wrap:wrap;gap:9px;margin:12px 0 16px;display:flex}.check-chips label{color:#7c97a2;border:1px solid #e1eaeb;border-radius:6px;align-items:center;gap:5px;padding:6px 8px;font-size:10px;display:flex}.recommend-label{color:#6ba99c;background:#edf7f2;border-radius:12px;padding:4px 9px;font-size:9px;display:inline-block}.module-timer{padding-top:3px}.timer-digits{letter-spacing:.03em;color:#477a86;text-align:center;font-variant-numeric:tabular-nums;margin-bottom:19px;font-size:52px;font-weight:500;line-height:1.3}.timer-digits span{color:#b5ced0;padding:0 5px}.module-timer>label{color:#8ea4ae;justify-content:space-between;align-items:center;gap:15px;font-size:10px;display:flex}.module-timer input{width:83px}.module-timer>.module-actions{justify-content:center}.module-quiz>form{flex-direction:column;gap:12px;display:flex}.module-quiz fieldset{border:0;margin:0;padding:0}.module-quiz legend{color:#829ba5;font-size:11px}.module-quiz>.inline-check{margin-bottom:16px}.module-quiz>.primary{min-height:38px;font-size:11px;display:flex}.module-quiz h4{font-size:15px;line-height:1.95}.module-quiz form .primary{min-height:37px;margin-top:5px;font-size:11px}.module-quiz .text-button{font-size:9px}.quiz-feedback{color:#ac9259;background:#fff6e6;border-radius:8px;margin-top:18px;padding:17px}.quiz-feedback.yes{color:#52917d;background:#eaf5ef}.quiz-feedback strong{font-size:12px}.quiz-feedback p{color:inherit;margin-top:9px;font-size:11px}.quiz-feedback .secondary{min-height:35px;font-size:10px}.quiz-results>strong{color:#39837e;margin-bottom:20px;font-size:26px;display:block}.quiz-results>p{border-bottom:1px solid #edf2f2;margin:0;padding:9px 0;font-size:11px}.quiz-results small{color:#9aafb7;margin-top:4px;font-size:9px;display:block}.quiz-results .secondary{margin-top:20px;font-size:11px}.confidence-list{flex-direction:column;gap:12px;display:flex}.confidence-list button{text-align:left;background:#f4f8f9;border-radius:6px;padding:12px}.confidence-list strong{color:#71989e;font-size:11px;display:block}.confidence-list small{color:#9ab0b8;margin-top:4px;font-size:9px;display:block}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.add-module-button{color:#78a093;background:#f4f9f6;border:1px dashed #cbdeda;border-radius:10px;justify-content:center;align-items:center;gap:10px;width:100%;margin-top:24px;padding:20px;font-size:12px;display:flex}.preset-panel{background:#edf6f3;border:1px solid #deebe6;border-radius:11px;margin-bottom:25px;padding:25px 27px}.preset-panel h2{margin-bottom:6px;font-size:18px}.preset-panel p{color:#84a098;margin-bottom:16px;font-size:11px}.preset-buttons{flex-wrap:wrap;gap:10px;display:flex}.preset-buttons button{color:#7e9b93;background:#ffffffa8;border:1px solid #dcebe5;border-radius:7px;align-items:center;gap:6px;padding:9px 14px;font-size:11px;display:flex}.preset-buttons button.selected{color:#fff;background:#128f83;border-color:#128f83}.preset-panel .module-note{margin-bottom:0;font-size:9px!important}.catalog-toolbar{align-items:center;gap:17px;margin-bottom:19px;display:flex}.catalog-toolbar>span{white-space:nowrap;color:#8ca2ac;font-size:10px}.catalog-toolbar .text-button{white-space:nowrap;font-size:10px}.module-catalog{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;display:grid}.module-catalog>article{background:#fff;border:1px solid #e4ebed;border-radius:9px;align-items:flex-start;gap:14px;padding:18px;display:flex}.module-catalog>article.enabled{background:#fcfefd;border-color:#c9e3da}.module-number{color:#a1b3b9;background:#f2f6f6;border-radius:6px;flex-shrink:0;place-items:center;width:31px;height:34px;font-size:13px;display:grid}.module-catalog>article.enabled .module-number{color:#70a68e;background:#e8f5ed}.module-catalog>article>div:nth-child(2){flex:1;min-width:0}.catalog-category{color:#a2b4bc;font-size:8px}.module-catalog h3{margin:4px 0 6px;font-size:12px;line-height:1.75}.module-catalog p{color:#98aeb6;margin:0;font-size:9px;line-height:1.8}.catalog-controls{flex-direction:column;align-items:center;gap:10px;display:flex}.catalog-controls .sound-switch{width:37px;height:23px;padding:3px}.catalog-controls .sound-switch>span{width:17px;height:17px}.catalog-controls .sound-switch.on>span{transform:translate(14px)}.catalog-controls>div{gap:1px;display:flex}.catalog-controls .icon-button{color:#a1b6bd;padding:3px}.workspace.focused-workspace .modules-grid{grid-template-columns:minmax(0,800px);justify-content:center}.workspace.large-text{--module-size:15px}.workspace.large-text .workspace-module h2{font-size:21px}.workspace.large-text .workspace-module :is(label,strong,button,input,select,textarea){font-size:14px}.workspace.large-text .module-note{font-size:12px!important}.workspace.large-text .module-stat strong{font-size:39px}.workspace.large-text .timer-digits{font-size:57px}@media (min-width:1600px){.modules-grid,.module-catalog{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (max-width:1050px){.workspace-heading{align-items:flex-start}.workspace-heading h1{font-size:23px}.workspace-heading>.secondary{min-height:37px;padding:9px 12px;font-size:10px}.workspace-module{padding:19px}.modules-grid{gap:15px}.module-catalog{grid-template-columns:1fr}.catalog-toolbar{flex-wrap:wrap;gap:9px}.catalog-toolbar .search-box{flex-basis:100%}.catalog-toolbar .text-button{margin-left:auto}.workspace-data-banner{flex-wrap:wrap;align-items:flex-start;gap:7px}.workspace-data-banner button{margin-left:auto}}@media (max-width:780px){.modules-grid{grid-template-columns:1fr}.workspace-heading{flex-direction:column;gap:14px}.workspace-heading>.secondary{align-self:flex-end}.workspace-heading h1{font-size:23px}.workspace-heading p{font-size:10px}.workspace-module{padding:23px}.module-catalog>article{padding:16px}.workspace-data-banner,.dashboard-summary{font-size:9px}.preset-panel{padding:20px}.preset-panel h2{font-size:16px}.preset-panel p{font-size:10px}.preset-buttons{gap:7px}.preset-buttons button{padding:8px 10px;font-size:10px}.sidebar-note{display:none}.sidebar-label{margin-top:29px}.sidebar nav .nav-item{margin-bottom:3px}}@media (max-width:620px){.workspace-heading{margin-bottom:18px}.workspace-heading h1{font-size:23px;line-height:1.65}.workspace-heading>.secondary{align-self:flex-start;font-size:10px}.workspace-data-banner{margin-bottom:20px;padding:11px 12px;font-size:8px}.workspace-data-banner button{font-size:9px}.dashboard-summary{gap:8px;font-size:8px}.workspace-module{padding:21px 19px}.workspace-module h2{font-size:17px}.workspace-module>header{margin-bottom:18px}.module-stat strong{font-size:34px}.module-stat span{font-size:9px}.module-note{font-size:9px!important}.module-catalog>article{gap:10px;padding:16px 13px}.module-catalog h3{font-size:12px}.module-catalog p{font-size:9px}.module-number{width:26px;height:29px;font-size:11px}.catalog-controls .icon-button{padding:4px}.preset-panel h2{font-size:16px;line-height:1.8}.catalog-toolbar>span,.catalog-toolbar .text-button{font-size:9px}.badge-grid{grid-template-columns:repeat(2,1fr)}.module-actions .secondary{font-size:10px}.sidebar-label{display:none}.large-text .workspace-module :is(label,strong,button,input,select,textarea){font-size:13px!important}.large-text .module-stat strong{font-size:38px!important}}.sidebar{overflow-y:auto}.sidebar-note{display:none}.workspace-module input[type=date]{min-height:39px}.workspace-module button:disabled{opacity:.4}.workspace-module .module-form>label,.workspace-module label.module-form{color:#7c949f;font-size:11px}.workspace-module.module-m33{grid-column:1/-1}.deck-library{min-width:0;font-size:var(--reading-body,1.125rem);line-height:1.8}.deck-library *,.deck-tabs{box-sizing:border-box;min-width:0}.deck-library h3{margin:.4em 0;line-height:1.5;font-size:1.5em!important}.deck-library h4{margin:.5em 0;line-height:1.6;font-size:1.2em!important}.deck-library p{font-size:inherit;overflow-wrap:anywhere}.deck-library button,.deck-tabs button,.deck-library input,.deck-library select{white-space:normal;overflow-wrap:anywhere;max-width:100%;min-height:48px;font-size:var(--reading-body,1.125rem)!important}.deck-library button{justify-content:center}.deck-library label,.deck-library legend{gap:8px;font-weight:600;display:grid;font-size:var(--reading-body,1.125rem)!important}.deck-library input,.deck-library select{color:#183849;background:#fff;border:1px solid #a7bdc4;border-radius:9px;width:100%;padding:10px 12px}.deck-library input[type=file]{font-size:var(--reading-small,1rem)!important}.deck-meta,.deck-library figcaption{color:#526c7a;font-size:var(--reading-small,1rem)!important}.deck-tabs,.deck-actions,.deck-audio{flex-wrap:wrap;gap:12px;margin-bottom:20px;display:flex}.deck-intro{background:#eff7f5;border-radius:14px;margin-bottom:24px;padding:22px}.deck-filters{grid-template-columns:2fr 1fr 1fr;gap:16px;display:grid}.deck-catalog{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:20px;display:grid}.deck-catalog article{background:#fff;border:1px solid #d5e2e3;border-radius:14px;flex-direction:column;gap:10px;padding:22px;display:flex}.deck-catalog article>button{margin-top:auto}.deck-catalog progress,.deck-progress{accent-color:#007574;width:100%;height:10px}.deck-heading,.deck-study-top,.deck-result{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:18px;display:flex}.deck-heading>div{flex:240px}.deck-heading{margin:16px 0 22px}.deck-modes{border:1px solid #d5e2e3;border-radius:12px;grid-template-columns:repeat(auto-fit,minmax(min(100%,160px),1fr));gap:12px;margin:0 0 20px;padding:15px;display:grid}.deck-modes button{text-align:center;gap:3px;display:grid}.deck-modes small{color:inherit;font-size:var(--reading-small,1rem)!important}.deck-filter-label{max-width:500px}.deck-face{background:#f5f9f8;border:1px solid #d5e2e3;border-radius:16px;margin:20px 0;padding:26px}.deck-back{border-top:1px solid #c8dad7;margin-top:24px;padding-top:20px}.deck-back>strong{color:#146b65;overflow-wrap:anywhere;display:block;font-size:1.6em!important}.deck-example{background:#fff;border-left:4px solid #3b958b;padding:12px 18px}.deck-choices{grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));gap:14px;margin-top:20px;display:grid}.deck-answer{gap:14px;max-width:650px;display:grid}.deck-diagram{color:#155c62;margin:20px 0}.deck-diagram svg{width:100%;max-width:420px;height:auto;display:block}.deck-result,.deck-finish{color:#224b47;background:#e8f4ef;border-radius:14px;padding:24px}.deck-finish{margin:20px 0}.deck-import{border-top:1px solid #d5e2e3;margin-top:28px;padding-top:20px}.deck-import summary{cursor:pointer;padding:12px 0;font-weight:700}.deck-import label{margin-bottom:16px}.deck-audio-status{border:1px solid #99bab7;border-radius:10px;padding:14px}@media (max-width:760px){.deck-filters,.deck-catalog{grid-template-columns:1fr}.deck-intro,.deck-face,.deck-catalog article,.deck-result,.deck-finish{padding:18px}.deck-modes{grid-template-columns:1fr}.deck-audio>button,.deck-actions>button{flex:190px}.deck-tabs>button{flex:160px}}.deck-coverage{border:1px solid #c6dad6;border-radius:12px;margin-top:28px;padding:16px}.deck-coverage summary{cursor:pointer;padding:8px 0;font-weight:700}.deck-coverage-list{grid-template-columns:repeat(auto-fit,minmax(min(100%,270px),1fr));gap:14px;display:grid}.deck-coverage-list>div{background:#f5f9f8;border-radius:10px;gap:7px;padding:15px;display:grid}.deck-coverage-list span{font-size:var(--reading-small,1rem)}.workspace-module[id]{scroll-margin-top:100px}.completion-chips button small{margin-top:8px;display:block}.app-shell{--reading-body:1rem;--reading-small:.875rem}.app-shell.app-large-text{--reading-body:1.125rem;--reading-small:1rem}.app-shell.app-large-text :is(.page-title p,.question-text,.watch-caption p,.point-box p,.explanation-steps p,.settings-panel p,.notice,.lesson-card-body>p,.card-title,.primary,.secondary,.text-button){font-size:var(--reading-body);line-height:1.85}.app-shell.app-large-text :is(.card-meta,.card-footer>span,.footnote,.breadcrumb,.board-note){font-size:var(--reading-small)}.app-shell :is(.workspace-heading,.study-heading,.section-title,.page-title,.answer-row,.button-row,.module-actions,.catalog-toolbar,.course-meta,.correct-answer,.breadcrumb,.sound-toggle-row,.narration-voice-label,.sound-volume-label){min-width:0}.app-shell :is(.workspace-module,.lesson-card,.question-panel,.settings-panel,.module-catalog article,.modal,.list-row,.history-row,.course-lesson,.module-lesson-list button,.mini-timeline button,.weak-unit,.before-after>div,.card-flip){overflow-wrap:anywhere}.app-shell :is(input,select,textarea){min-width:0;max-width:100%}.app-shell :is(.primary,.secondary,.text-button,.nav-item,.course-status,.history-word){white-space:normal}.app-shell :is(.module-catalog article>div,.module-lesson-list button>span,.mini-timeline button>span,.history-row>span,.course-lesson>span,.collapsed-board>span,.workspace-heading>div){min-width:0}@media (max-width:760px){.app-shell{--reading-body:1.125rem;--reading-small:1rem;font-size:var(--reading-body);line-height:1.8}.app-shell.app-large-text{--reading-body:1.25rem;--reading-small:1.125rem}.app-shell :is(p,li,label,input,select,textarea,button,strong){line-height:1.8;font-size:var(--reading-body)!important}.app-shell :is(small,.eyebrow,.sidebar-label,.board-kicker,.board-top,.board-top>span,.section-overline,.card-meta,.card-meta>span,.card-footer>span,.done-mark,.art-label,.art-bottom,.hero-tag,.floating-label,.diagram-caption,.footer-brand,footer,footer>span,.banner-detail,.demo-banner,.demo-banner button,.small-date,.count-pill,.module-note,.module-empty,.catalog-category,.module-number,.dashboard-summary,.workspace-data-banner,.workspace-data-banner button,.workspace-module header>div>span,.workspace-module header i,.calendar-grid>span,.daily-bars>div,.daily-bars small,.course-meta,.course-meta span,.footnote,.history-row small,.history-word,.list-row small,.course-lesson small,.course-status,.math-keypad span,.mini-formula small,.collapsed-board small,.correct-answer small,.explanation-question>span,.recommend-label,.badge-grid small,.card-flip small,.quiz-results small,.confidence-list small,.profile small){line-height:1.7;font-size:var(--reading-small)!important}.app-shell h1{letter-spacing:0;line-height:1.65;font-size:1.625rem!important}.app-shell :is(h2,h3,h4,.card-title,.course-lesson strong,.mini-timeline strong,.module-lesson-list strong){line-height:1.8;font-size:1.125rem!important}.app-shell :is(.page-title p,.workspace-heading p,.hero p,.watch-caption p,.question-text,.explanation-steps p,.point-box p,.explanation-question p,.settings-panel p,.notice p,.workspace-module>div>p,.workspace-module>p,.module-quiz h4,.quiz-feedback p,.flashcard>strong,.card-flip strong,.module-form,.module-form label,.task-list label,.inline-check){line-height:1.9;font-size:var(--reading-body)!important}.app-shell :is(.eyebrow,.section-overline,.board-kicker){letter-spacing:.04em}.app-shell :is(p,.module-note,.card-meta,.card-meta>span,.lesson-card-body>p,.footnote,.section-title p,.workspace-heading p,.page-title p,.notice,.notice p,.module-empty,.workspace-data-banner,.dashboard-summary,.course-meta,.profile small,.catalog-category,.module-number,.math-keypad span,.eyebrow,.mini-timeline small,.module-stat span,.metric-list small,.module-select,.inline-check,.card-flip small,.badge-grid small,.calendar-grid>span,.daily-bars>div,.history-row small,.history-word,.list-row small,.course-lesson small,.course-status,.card-footer>span,.done-mark,.art-label,.art-bottom,.footer-brand,footer,.banner-detail,.demo-banner,.demo-banner button,.section-overline,.section-overline>span:last-child){color:#526c7a}.app-shell :is(button,.primary,.secondary,.text-button,.icon-button,.nav-item){min-height:44px}.app-shell :is(.primary,.secondary){text-align:center;min-height:48px;padding:11px 16px}.app-shell .icon-button{min-width:44px;padding:10px}.app-shell :is(input:not([type=checkbox]):not([type=range]),select,textarea){min-height:48px;padding:11px 12px;font-size:max(1rem, var(--reading-body))!important}.app-shell input[type=checkbox]{width:20px;height:20px}.app-shell :is(.inline-check,.check-chips label,.task-list label){min-height:44px}.main-wrap main{padding-inline:16px}.mobile-header{gap:12px;height:auto;min-height:68px;padding:9px 16px}.mobile-header .brand{flex-wrap:wrap;min-width:0;font-size:1.25rem!important}.sidebar{overflow-y:auto}.sidebar .brand{font-size:1.25rem!important}.nav-item{gap:12px;padding:12px}.profile{padding:16px 0}.profile strong{font-size:1rem!important}.avatar{min-width:40px;height:40px}.demo-banner{flex-wrap:wrap;gap:6px;height:auto;min-height:46px;padding:8px 16px}.demo-banner .banner-detail{display:none}.demo-banner button{margin-left:auto;padding:0 2px}.page-title,.workspace-heading{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:24px;display:flex}.page-title p{max-width:none}.workspace-heading>.secondary{align-self:stretch}.small-date{display:none}.hero{min-height:0;padding:24px 20px;display:block}.hero h2{font-size:1.65rem!important}.hero p{margin-bottom:22px}.hero-diagram{display:none}.hero-tag{white-space:normal;margin-bottom:16px}.hero .primary{width:100%}.stats-row{grid-template-columns:1fr;gap:12px}.stats-row>div{text-align:left;gap:16px;padding:18px;display:flex}.stat-icon{width:42px;height:42px;margin:0}.stats-row div div>span{color:#526c7a;font-size:var(--reading-small)!important}.stats-row strong{line-height:1.3;font-size:2rem!important}.stats-row>div>button{min-width:44px;display:flex}.section-title{flex-direction:column;align-items:flex-start;gap:10px}.filter-panel{flex-direction:column;display:flex}.search-box{flex-basis:auto;width:100%;padding:0 12px}.search-box input{width:100%;height:auto;min-height:48px}.select-label{white-space:normal;align-items:center;width:100%}.select-label select{width:100%;min-width:0;max-width:none}.unit-tabs{flex-wrap:wrap;gap:8px;padding:4px 0;overflow:visible}.unit-tabs button{white-space:normal;border-radius:22px;padding:8px 13px}.lesson-grid,.course-grid,.module-catalog,.modules-grid,.workspace.focused-workspace .modules-grid{grid-template-columns:minmax(0,1fr)}.lesson-card-body{padding:20px}.lesson-art{height:auto;min-height:170px;padding:18px 20px}.art-formula{white-space:normal;overflow-wrap:anywhere;margin:18px 0;line-height:1.7;font-size:1.6rem!important}.art-bottom{gap:16px}.round-play{min-width:36px;height:36px}.card-meta,.card-footer{flex-wrap:wrap;gap:10px}.card-meta>span{padding:3px 8px}.card-title{margin-block:12px}.lesson-card-body>p{min-height:0;margin-bottom:16px}.card-footer>span{flex-wrap:wrap;gap:8px}.card-footer .bookmark-button{min-width:44px}.done-mark{margin-left:0}footer{flex-direction:column;align-items:flex-start;gap:12px}.breadcrumb{flex-wrap:wrap;gap:10px}.breadcrumb>span{text-align:left;font-size:var(--reading-small)!important}.study-heading{align-items:flex-start;gap:10px}.study-heading>div{min-width:0}.study-heading .eyebrow{font-size:var(--reading-small)!important}.learning-steps{grid-template-columns:minmax(0,1fr);gap:8px;display:grid}.learning-steps>svg{display:none}.learning-steps button{background:#edf3f4;border-radius:7px;gap:12px;padding:9px 12px}.learning-steps button.current{background:#e0f1ec}.learning-steps button span{width:28px;height:28px;font-size:var(--reading-small)!important}.board-top{flex-wrap:wrap;padding:13px 16px}.board-top>span:last-child{color:#b1c5d0;margin-left:0}.board-content{min-height:0;padding:25px 20px}.board-kicker{color:#a6cbd3!important}.board-content h2{color:#e0edf2;margin:16px 0 24px}.equation{margin-bottom:20px;line-height:1.7;font-size:1.75rem!important}.board-note{font-size:var(--reading-body)!important;color:#b4cedc!important}.board-controls{flex-wrap:wrap;gap:9px;padding:10px 12px}.board-controls .icon-button{min-width:40px;min-height:44px}.board-controls .slide-dots{flex-basis:calc(100% - 67px);order:-1;margin:0}.board-controls>span{color:#c0d4dd;font-size:var(--reading-small)!important}.slide-dots button{background:0 0;height:44px;min-height:44px;position:relative}.slide-dots button:after{content:"";background:#607b8b;border-radius:3px;position:absolute;inset:19px 0}.slide-dots button.filled:after{background:#16b8b1}.board-controls .slide-dots .filled{background:0 0}.collapsed-board{grid-template-columns:minmax(0,1fr) 28px;gap:10px;padding:17px;display:grid}.collapsed-board .mini-formula{white-space:normal;border:0;border-bottom:1px solid #4e6578;grid-column:1/-1;max-width:none;padding:0 0 10px;font-size:1.125rem!important}.collapsed-board strong{color:#e1edf2}.collapsed-board small,.mini-formula small{color:#b5cbd7!important}.collapsed-board>svg{margin:0}.question-panel{padding:24px 18px}.section-overline{flex-wrap:wrap;gap:8px}.answer-row{flex-direction:column}.answer-row .primary{white-space:normal}.answer-row input{min-height:54px;font-size:1.25rem!important}.answer-row input::placeholder{font-size:1rem}.math-keypad{gap:8px}.math-keypad button{width:44px;height:44px;font-size:1.25rem!important}.math-keypad span{margin:8px 0 0}.point-box{padding:18px}.point-box>div{min-width:0}.result{padding:17px 14px}.result>div{min-width:0}.correct-answer{gap:12px}.correct-answer strong{font-size:2rem!important}.explanation-steps li>span{width:28px;height:28px;font-size:1rem!important}.button-row{flex-direction:column;gap:12px}.button-row :is(.primary,.secondary){white-space:normal;flex:auto;width:100%}.board-overlay{padding:10px}.wide-board{max-height:calc(100dvh - 20px)}.wide-board .board-content{min-height:0;padding:24px 20px}.close-board{min-width:44px;min-height:44px}.review-summary{align-items:flex-start}.review-summary>div{min-width:0}.history-stats{grid-template-columns:1fr}.history-stats>div{padding:20px}.history-stats span{color:#526c7a;font-size:var(--reading-body)!important}.history-stats strong{font-size:2.125rem!important}.history-row{align-items:flex-start;padding:20px 15px}.history-row>span:nth-child(2){flex:1;min-width:0}.history-row>svg{display:none}.history-result{flex-shrink:0}.list-row,.course-lesson{flex-wrap:wrap;padding-block:18px}.list-row small{margin-left:0}.course-lesson>span:nth-child(2){flex:1;min-width:0}.course-cover{height:auto;min-height:150px}.course-cover>span{font-size:3.75rem!important}.course-body,.course-detail{padding:24px 20px}.course-meta{flex-wrap:wrap;gap:10px}.step-number{flex-shrink:0}.settings-panel{padding:24px 20px}.settings-panel h2{align-items:flex-start}.settings-panel>.secondary{width:100%;margin-right:0}.notice{padding:17px}.sound-switch,.catalog-controls .sound-switch{box-sizing:border-box;background-clip:border-box;border:0;border-radius:24px;flex-shrink:0;width:64px;height:44px;padding:6px}.sound-switch>span,.catalog-controls .sound-switch>span{width:24px;height:24px}.sound-switch.on>span,.catalog-controls .sound-switch.on>span{transform:translate(28px)}.sound-toggle-row{gap:18px}.sound-toggle-row>div{min-width:0}.sound-toggle-row>div>span{color:#526c7a;display:block;font-size:var(--reading-small)!important}.narration-voice-label{flex-direction:column;align-items:stretch;gap:8px}.narration-voice-label select{width:100%;min-width:0}.sound-volume{max-width:100%;min-height:44px}.sound-volume input{min-height:44px}.modal-backdrop{padding:16px}.modal{width:100%;max-height:calc(100dvh - 32px);padding:56px 22px 24px;overflow-y:auto}.modal .text-button{justify-content:center;width:100%}.toast{width:auto;min-width:0;max-width:none;font-size:var(--reading-body);padding:15px;left:16px;right:16px;transform:none}.narration-stop{justify-content:center;min-height:48px;bottom:16px;left:16px;right:16px}.workspace{--module-size:var(--reading-body)}.workspace.large-text{--reading-body:1.25rem;--reading-small:1.125rem}.workspace-data-banner{gap:10px;margin-bottom:22px;padding:14px}.workspace-data-banner>span{min-width:0}.workspace-data-banner button{margin-left:0;padding:5px 0}.dashboard-summary{flex-direction:column;gap:5px}.workspace-module{padding:22px 18px}.workspace-module>header{gap:8px;margin-bottom:20px;padding-bottom:16px}.workspace-module header>button{flex-shrink:0;margin-top:0}.workspace-module header>div{min-width:0}.workspace-module h2{font-size:1.25rem!important}.workspace-module>header>div>span{color:#526c7a}.workspace-module :is(.module-form>label,label.module-form,.module-select){font-size:var(--reading-body)!important}.module-empty{padding:20px 16px}.module-stat-row{flex-wrap:wrap;gap:22px}.module-stat{flex:95px;padding:8px 0 15px}.module-stat strong,.workspace.large-text .module-stat strong{font-size:2.625rem!important}.module-stat span{color:#526c7a;font-size:var(--reading-small)!important}.module-actions{align-items:stretch;gap:10px}.module-actions:not(.compact)>button{flex:150px}.module-actions.compact{flex-direction:column;align-items:flex-start;gap:8px}.module-actions :is(.primary,.secondary){padding:11px 14px}.module-lesson-list>button,.module-lesson-list>.bookmark-row{gap:14px;padding:16px 0}.module-lesson-list>button:first-child{padding-top:8px}.module-lesson-list small{color:#526c7a;font-size:var(--reading-small)!important}.module-lesson-list strong{font-weight:600}.mini-timeline{gap:15px}.mini-timeline button{align-items:flex-start;gap:12px}.mini-timeline small{margin-top:7px}.correct-dot,.retry-dot{width:32px;height:32px;font-size:1rem!important}.segmented{flex-wrap:wrap;width:100%;margin-block:17px}.segmented button{flex:105px;padding:10px 12px}.daily-bars{grid-template-columns:repeat(7,minmax(0,1fr));align-items:end;gap:18px 4px;height:auto;display:grid}.daily-bars>div{width:100%;min-width:0;height:auto}.daily-bars .bar-track{flex:none;height:100px}.daily-bars>div>span,.daily-bars small{text-align:center;overflow-wrap:anywhere;width:100%}.daily-bars small,.daily-bars>div>span{font-size:.875rem!important}.calendar-grid{gap:3px}.calendar-grid button{min-width:0;min-height:44px;padding:4px 0;font-size:.875rem!important}.calendar-grid>span{padding-inline:0;font-size:.875rem!important}.metric-list{gap:22px}.metric-list>div{gap:8px}.metric-list span,.metric-list strong{font-size:var(--reading-body)!important}.meter{height:9px}.progress-ring strong{font-size:2.75rem!important}.progress-ring>span{color:#526c7a;font-size:var(--reading-small)!important}.completion-chips{flex-direction:column;gap:10px}.completion-chips button{text-align:left;padding:11px 13px}.badge-grid{grid-template-columns:minmax(0,1fr);gap:14px}.badge-grid>div{padding:20px 16px}.badge-grid span{font-size:2rem!important}.badge-grid strong{margin:10px 0 7px}.badge-grid>div:not(.earned){color:#607987}.weak-unit{gap:12px;padding:18px 0}.weak-unit small{color:#526c7a;margin-left:0;font-size:var(--reading-small)!important}.weak-unit .text-button{min-height:44px}.mistake-list>div{margin-bottom:18px;padding-bottom:18px}.mistake-list small{color:#526c7a;margin-block:8px 12px;font-size:var(--reading-small)!important}.rating-picker{gap:6px}.rating-picker button{min-width:0;min-height:48px;font-size:1.25rem!important}.before-after{grid-template-columns:minmax(0,1fr);gap:14px}.before-after>div{padding:18px}.before-after small{color:#526c7a;font-size:var(--reading-small)!important}.card-list{gap:16px;max-height:none}.card-flip{min-height:120px;padding:20px 17px}.card-tools{flex-wrap:wrap;gap:10px;padding:10px 13px}.card-tools>button{min-width:44px}.flashcard{gap:22px;min-height:200px;padding:24px 18px}.bookmark-row>button:first-child{text-align:left;flex:1;min-width:0}.bookmark-row>button:last-child{flex-shrink:0;min-width:44px}.task-list{gap:16px}.task-list>div>button{flex-shrink:0;min-width:44px}.inline-form{flex-wrap:wrap;gap:10px}.inline-form input{flex:160px}.inline-form .primary{min-width:48px;min-height:48px}.check-chips{flex-direction:column;gap:10px}.check-chips label{gap:10px;padding:11px 13px}.recommend-label{white-space:normal;padding:5px 10px}.timer-digits,.workspace.large-text .timer-digits{letter-spacing:0;overflow-wrap:anywhere;font-size:3.375rem!important}.timer-digits span{padding-inline:2px;font-size:inherit!important}.module-timer>label{flex-wrap:wrap;gap:10px}.module-timer input{width:100%}.module-quiz legend{color:#526c7a;font-size:var(--reading-body)!important}.module-quiz>form{gap:17px}.module-quiz>form label{gap:9px}.module-quiz .primary{width:100%}.quiz-feedback{padding:20px 16px}.quiz-feedback strong{font-size:var(--reading-body)!important}.quiz-feedback .secondary{width:100%}.quiz-results>strong{font-size:1.875rem!important}.quiz-results>p{padding-block:15px}.confidence-list{gap:15px}.confidence-list button{padding:17px}.confidence-list small{margin-top:8px}.preset-panel{padding:24px 18px}.preset-buttons{grid-template-columns:minmax(0,1fr);gap:10px;display:grid}.preset-buttons button{justify-content:center;padding:12px}.catalog-toolbar{flex-direction:column;align-items:stretch;gap:13px}.catalog-toolbar .search-box{flex-basis:auto}.catalog-toolbar .text-button{margin-left:0}.module-catalog>article{grid-template-columns:minmax(0,1fr) auto;gap:12px;padding:20px 17px;display:grid}.module-catalog .module-number{background:0 0;grid-column:1/-1;justify-content:start;width:auto;height:auto}.module-catalog>article>div:nth-child(2){min-width:0}.module-catalog h3{margin-block:7px 10px;font-size:1.125rem!important}.module-catalog p{color:#526c7a;font-size:var(--reading-body)!important}.catalog-controls{gap:10px}.catalog-controls>div{flex-direction:column;gap:6px}.catalog-controls .icon-button{min-width:44px;min-height:44px}.add-module-button{text-align:center;min-height:56px;padding:18px}.workspace.large-text .workspace-module :is(label,strong,button,input,select,textarea),.large-text .workspace-module :is(label,strong,button,input,select,textarea){font-size:var(--reading-body)!important}.workspace.large-text .module-stat strong{font-size:2.625rem!important}}@media (max-width:360px){.main-wrap main{padding-inline:12px}.workspace-module,.question-panel,.settings-panel,.lesson-card-body,.course-body,.course-detail{padding-inline:16px}.module-catalog>article{grid-template-columns:minmax(0,1fr)}.catalog-controls{flex-direction:row;justify-content:space-between;width:100%}.catalog-controls>div{flex-direction:row}.metric-list>div{grid-template-columns:minmax(0,1fr)}.metric-list strong,.metric-list small{text-align:left}.module-stat-row{flex-direction:column;gap:8px}.module-stat{flex:auto}}@media (max-width:760px){.app-shell :is(label,.unit-tabs button,.text-button,.nav-item,.segmented button,.completion-chips button,.preset-buttons button:not(.selected),.catalog-controls .icon-button,.calendar-grid button){color:#526c7a}.app-shell :is(.unit-tabs button.active,.nav-item.active,.segmented button.active,.completion-chips button.done,.calendar-grid button.studied){color:#216c60}.app-shell .primary,.preset-buttons button.selected{color:#fff;background:#007574}.badge-grid .earned strong{color:#806822}.app-shell input::placeholder,.app-shell textarea::placeholder{color:#667d87;opacity:1}.app-shell .workspace.large-text .module-note{line-height:1.8;font-size:var(--reading-small)!important}.app-shell :is(.module-quiz,.module-form,.mini-flashcard,.module-catalog article,.inline-form,.card-tools,.flashcard,.workspace-module>div){min-width:0}}@media (max-width:620px){.sidebar.is-open{width:100%;max-height:none;padding:16px;position:static;inset:auto;overflow:visible}}@media (max-width:760px){.app-shell .alert{font-size:var(--reading-body);align-items:flex-start;gap:10px;line-height:1.8}.app-shell .nav-count{min-width:24px;height:24px;font-size:.875rem!important}.app-shell .step-number{min-width:40px;height:40px;font-size:var(--reading-small)!important}}@media (min-width:761px){.app-shell{--reading-body:1.125rem;--reading-small:1rem;font-size:var(--reading-body);line-height:1.8}.app-shell.app-large-text,.workspace.large-text{--reading-body:1.25rem;--reading-small:1.125rem}.app-shell :is(p,li,label,input,select,textarea,button,strong){line-height:1.8;font-size:var(--reading-body)!important}.app-shell :is(small,.eyebrow,.sidebar-label,.board-kicker,.board-top,.board-top>span,.section-overline,.card-meta,.card-meta>span,.card-footer>span,.done-mark,.art-label,.art-bottom,.hero-tag,.floating-label,.diagram-caption,.footer-brand,footer,footer>span,.banner-detail,.demo-banner,.demo-banner button,.small-date,.count-pill,.module-note,.module-empty,.catalog-category,.module-number,.dashboard-summary,.workspace-data-banner,.workspace-data-banner button,.workspace-module header>div>span,.workspace-module header i,.calendar-grid>span,.daily-bars>div,.daily-bars small,.course-meta,.course-meta span,.footnote,.history-row small,.history-word,.list-row small,.course-lesson small,.course-status,.math-keypad span,.mini-formula small,.collapsed-board small,.correct-answer small,.explanation-question>span,.recommend-label,.badge-grid small,.card-flip small,.quiz-results small,.confidence-list small,.profile small,.sound-toggle-row>div>span,.module-stat span,.progress-ring>span,.metric-list small,.mistake-list small,.before-after small){line-height:1.75;font-size:var(--reading-small)!important}.app-shell h1{letter-spacing:0;line-height:1.65;font-size:2rem!important}.app-shell :is(h2,h3,h4,.card-title){line-height:1.8;font-size:1.375rem!important}.app-shell :is(.card-title,.module-lesson-list strong,.mini-timeline strong,.course-lesson strong){font-size:var(--reading-body)!important}.app-shell :is(.question-text,.explanation-steps p,.point-box p,.explanation-question p,.module-quiz h4,.quiz-feedback p,.flashcard>strong,.card-flip strong,.task-list label,.inline-check,.module-form label,.module-select){line-height:1.9;font-size:var(--reading-body)!important}.app-shell :is(.eyebrow,.section-overline,.board-kicker,.sidebar-label){letter-spacing:.05em}.app-shell :is(p,label,.module-note,.card-meta,.card-meta>span,.lesson-card-body>p,.footnote,.section-title p,.workspace-heading p,.page-title p,.notice,.notice p,.module-empty,.workspace-data-banner,.dashboard-summary,.course-meta,.profile small,.catalog-category,.module-number,.math-keypad span,.eyebrow,.mini-timeline small,.module-stat span,.metric-list small,.module-select,.inline-check,.card-flip small,.badge-grid small,.calendar-grid>span,.daily-bars>div,.history-row small,.history-word,.list-row small,.course-lesson small,.course-status,.card-footer>span,.done-mark,.art-label,.art-bottom,.footer-brand,footer,.banner-detail,.demo-banner,.demo-banner button,.section-overline,.section-overline>span:last-child),.app-shell :is(.unit-tabs button,.text-button,.nav-item,.segmented button,.completion-chips button,.preset-buttons button:not(.selected),.catalog-controls .icon-button,.calendar-grid button){color:#526c7a}.app-shell :is(.unit-tabs button.active,.nav-item.active,.segmented button.active,.completion-chips button.done,.calendar-grid button.studied){color:#216c60}.app-shell .primary,.preset-buttons button.selected{color:#fff;background:#007574}.app-shell input::placeholder,.app-shell textarea::placeholder{color:#667d87;opacity:1}.app-shell :is(button,.icon-button){min-height:40px}.app-shell :is(.primary,.secondary){white-space:normal;min-height:46px;padding:11px 18px}.app-shell .icon-button{min-width:40px;padding:8px}.app-shell :is(input:not([type=checkbox]):not([type=range]),select,textarea){min-height:46px;padding:10px 12px;font-size:var(--reading-body)!important}.app-shell input[type=checkbox]{flex-shrink:0;width:19px;height:19px}.app-shell :is(.inline-check,.check-chips label,.task-list label){min-height:40px}.app-shell :is(.workspace-module,.module-catalog article,.module-quiz,.module-form,.inline-form,.mini-flashcard,.card-tools,.flashcard,.page-title>div,.hero-copy,.section-title>div,.study-heading>div,.aside-card,.course-lesson>span,.list-row>span,.profile>span,.stats-row>div>div){min-width:0}.app-shell :is(.module-quiz,.module-form,.mini-flashcard,.module-catalog article,.inline-form,.card-tools,.flashcard,.workspace-module>div,.page-title,.workspace-heading,.section-title,.profile){overflow-wrap:anywhere}.app-shell :is(.page-title,.workspace-heading,.section-title,.filter-panel,.button-row,.module-actions,.catalog-toolbar,.course-meta,.correct-answer,.breadcrumb,.sound-toggle-row,.sound-volume-label,.list-row,.course-lesson,.card-meta,.card-footer,.weak-unit){flex-wrap:wrap}.app-shell :is(.primary,.secondary,.text-button,.nav-item,.course-status,.history-word,.unit-tabs button,.mini-formula,.art-formula,.small-date,.select-label){white-space:normal}main{padding-top:38px}.sidebar{width:280px;overflow-y:auto}.main-wrap{margin-left:280px}.sidebar>*{flex-shrink:0}.sidebar .brand{align-items:flex-start;gap:9px;height:auto;min-height:min-content;font-size:1.5rem!important}.sidebar .brand>span:last-child{min-width:0}.brand small{letter-spacing:0;color:#526c7a;margin-top:7px;line-height:1.7;font-size:var(--reading-small)!important}.sidebar-label{margin:28px 12px 15px}.nav-item{align-items:flex-start;gap:11px;padding:12px 10px}.nav-item>svg{margin-top:6px}.nav-count{flex-shrink:0;min-width:25px;height:25px;font-size:var(--reading-small)!important}.sidebar-bottom .nav-item{margin-top:15px}.profile{align-items:flex-start;gap:10px;padding:20px 0 5px}.profile strong{font-size:var(--reading-body)!important}.avatar{flex-shrink:0;width:38px;height:38px}.profile>svg{flex-shrink:0;margin-top:7px}.demo-banner{flex-wrap:wrap;gap:8px;height:auto;min-height:48px;padding-block:9px}.demo-banner button{min-height:40px;margin-left:auto}.page-title,.workspace-heading{align-items:flex-start;gap:18px;margin-bottom:28px}.page-title p{margin-top:10px}.small-date{color:#526c7a;padding-top:12px}.eyebrow{margin-bottom:12px}.hero{gap:28px;min-height:340px;padding:32px}.hero-copy{flex:50%}.hero h2{line-height:1.7;font-size:2rem!important}.hero-tag{white-space:normal;margin-bottom:17px;padding:6px 12px}.hero p{margin:15px 0 25px}.hero-diagram{flex:0 43%;width:43%;min-width:0}.hero-diagram text:last-of-type{font-size:1rem}.app-large-text .hero-diagram text:last-of-type{font-size:1.125rem}.floating-label{white-space:normal;max-width:100%;top:-32px;right:8px}.diagram-caption{align-items:flex-start;gap:8px;margin-top:12px}.diagram-caption>svg{margin-top:5px}.stats-row{grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:16px}.stats-row>div{text-align:left;gap:15px;padding:21px;display:flex}.stats-row div div>span{color:#526c7a;font-size:var(--reading-small)!important}.stats-row strong{line-height:1.4;font-size:2.25rem!important}.stats-row strong small{font-size:var(--reading-small)!important}.stat-icon{flex-shrink:0;width:44px;height:44px;margin:0}.stat-icon svg{width:22px;height:22px}.stats-row>div>button{min-width:40px;display:inline-flex}.section-title{gap:14px;margin-bottom:22px}.count-pill{padding:7px 12px}.filter-panel{align-items:center;gap:16px}.search-box{flex:300px;padding:0 14px}.search-box input{height:auto;min-height:46px}.select-label{gap:10px}.select-label select{max-width:220px;height:auto}.unit-tabs{flex-wrap:wrap;gap:9px;margin:20px 0;overflow:visible}.unit-tabs button{padding:9px 16px}.lesson-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,290px),1fr));gap:24px}.lesson-art{height:auto;min-height:175px;padding:20px}.art-formula{white-space:normal;overflow-wrap:anywhere;margin:18px 0;line-height:1.8;font-size:1.6rem!important}.art-bottom{gap:14px}.round-play{width:34px;height:34px}.lesson-card-body{padding:20px}.card-meta,.card-footer{gap:10px}.card-meta>span{padding:3px 8px}.card-title{margin:12px 0}.lesson-card-body>p{min-height:0;margin-bottom:19px}.card-footer{padding-top:13px}.card-footer>span{flex-wrap:wrap;gap:7px}.done-mark{margin-left:0}footer{flex-wrap:wrap;gap:20px;padding:30px 0}.footer-brand{font-size:1.125rem!important}.breadcrumb{gap:18px;margin-bottom:27px}.breadcrumb>span{color:#526c7a;font-size:var(--reading-small)!important}.study-layout{grid-template-columns:minmax(0,1fr) minmax(250px,28%);gap:26px}.study-heading{gap:18px}.study-heading .eyebrow{font-size:var(--reading-small)!important}.study-aside{padding-top:130px}.aside-card{padding:22px}.aside-card :is(p,li,.text-button,.related){line-height:1.85;font-size:var(--reading-small)!important}.aside-card li{align-items:flex-start;gap:9px}.aside-card li>svg{margin-top:6px}.aside-card .related{padding-block:15px}.learning-steps{flex-wrap:wrap;gap:12px;margin:23px 0}.learning-steps button{gap:9px;min-height:44px}.learning-steps button span{width:27px;height:27px;font-size:var(--reading-small)!important}.board-top{color:#b1c5d0;flex-wrap:wrap;gap:9px;padding:16px 20px}.board-top>span:last-child{color:#b1c5d0}.board-content{min-height:340px;padding:32px}.board-kicker{color:#a6cbd3!important}.board-content h2{color:#e0edf2;margin-bottom:29px}.equation{overflow-wrap:anywhere;line-height:1.75;font-size:2.125rem!important}.board-note{max-width:100%;font-size:var(--reading-body)!important;color:#b4cedc!important}.board-controls{flex-wrap:wrap;gap:10px;padding:12px 16px}.board-controls>span{color:#c0d4dd;font-size:var(--reading-small)!important}.board-controls .slide-dots{min-width:90px}.slide-dots button{background:0 0;height:40px;min-height:40px;position:relative}.slide-dots button:after{content:"";background:#607b8b;border-radius:3px;position:absolute;inset:17px 0}.slide-dots button.filled:after{background:#16b8b1}.board-controls .slide-dots .filled{background:0 0}.watch-caption{padding:23px 0}.watch-caption .primary{min-height:50px}.point-box{gap:15px;padding:24px}.point-box>div{min-width:0}.point-box strong{color:#365b6d}.collapsed-board{gap:18px;padding:19px}.mini-formula{overflow-wrap:anywhere;white-space:normal;text-overflow:clip;max-width:40%;font-size:1.2rem!important}.mini-formula small,.collapsed-board small{color:#b5cbd7!important}.collapsed-board strong{color:#e1edf2}.collapsed-board>span:nth-child(2){flex:1;min-width:0}.question-panel{padding:28px}.section-overline{flex-wrap:wrap;gap:12px}.answer-row{flex-wrap:wrap;gap:13px}.answer-row input{flex:180px;min-height:52px;font-size:1.375rem!important}.answer-row input::placeholder{font-size:var(--reading-small)}.answer-row .primary{white-space:normal;flex:160px}.math-keypad{flex-wrap:wrap;gap:9px}.math-keypad button{width:42px;height:42px;font-size:1.25rem!important}.math-keypad span{margin-left:0}.result>div{min-width:0}.correct-answer{gap:18px;padding:24px}.correct-answer strong{font-size:2.125rem!important}.explanation-steps{margin-top:28px}.explanation-steps li{gap:16px;margin-bottom:24px}.explanation-steps li>span{width:28px;height:28px;font-size:var(--reading-small)!important}.explanation-question{padding:20px}.button-row{gap:14px}.button-row :is(.primary,.secondary){flex:210px}.review-summary{flex-wrap:wrap;align-items:flex-start;gap:22px}.review-summary>div{flex:260px;min-width:0}.review-summary .primary{font-size:var(--reading-body)!important}.course-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));gap:26px}.course-cover{height:auto;min-height:165px}.course-cover>span{font-size:4rem!important}.course-body,.course-detail{padding:26px}.course-meta{gap:14px}.course-lesson{gap:17px;padding-block:20px}.course-lesson>span:nth-child(2){flex:200px}.step-number{flex-shrink:0;min-width:42px;height:42px;font-size:var(--reading-small)!important}.course-status{margin-left:0}.history-stats{grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr))}.history-stats>div{padding:25px}.history-stats span{color:#526c7a;font-size:var(--reading-small)!important}.history-stats strong{font-size:2.5rem!important}.history-row{align-items:flex-start;gap:15px;padding:22px}.history-row>span:nth-child(2){flex:1;min-width:0}.history-result{flex-shrink:0}.history-row>svg:last-child{flex-shrink:0;margin-top:5px}.history-row small{margin-top:7px}.history-word{padding-top:4px}.list-row{gap:15px;padding:22px}.list-row small{margin-left:auto}.settings-panel{padding:28px}.settings-panel>.secondary{margin-bottom:10px}.notice{padding:21px}.sound-toggle-row{gap:20px;padding:17px 0}.sound-toggle-row>div{min-width:0}.sound-toggle-row>div>span{color:#526c7a;display:block}.sound-switch,.catalog-controls .sound-switch{box-sizing:border-box;background-clip:border-box;border:0;border-radius:24px;flex-shrink:0;width:64px;height:44px;padding:6px}.sound-switch>span,.catalog-controls .sound-switch>span{width:24px;height:24px}.sound-switch.on>span,.catalog-controls .sound-switch.on>span{transform:translate(28px)}.narration-voice-label{flex-wrap:wrap;gap:15px}.narration-voice-label select{min-width:0}.sound-volume{min-height:44px}.sound-volume input{min-height:40px}.modal{max-width:560px;max-height:calc(100dvh - 50px);padding:45px 32px 28px;overflow-y:auto}.modal h2{font-size:1.5rem!important}.modal-close{min-width:40px;min-height:40px}.alert{font-size:var(--reading-body);align-items:flex-start;gap:12px;line-height:1.8}.toast{font-size:var(--reading-body);max-width:min(680px,100vw - 280px);padding:17px 22px}.narration-stop{min-height:46px;padding:11px 20px;font-size:var(--reading-body)!important}.workspace{--module-size:var(--reading-body)}.workspace-heading>.secondary{white-space:normal;align-self:flex-start}.workspace-data-banner{flex-wrap:wrap;gap:17px;padding:15px 18px}.workspace-data-banner>span{min-width:0}.workspace-data-banner button{margin-left:0}.dashboard-summary{flex-wrap:wrap;gap:15px;margin-bottom:22px}.modules-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:24px}.workspace.focused-workspace .modules-grid{grid-template-columns:minmax(0,850px);justify-content:center}.workspace-module{padding:25px}.workspace-module>header{gap:12px;margin-bottom:23px;padding-bottom:19px}.workspace-module>header>div{min-width:0}.workspace-module>header>button{flex-shrink:0}.workspace-module h2{font-size:1.375rem!important}.workspace-module>header>div>span{color:#526c7a}.workspace-module :is(.module-form>label,label.module-form,.module-select){font-size:var(--reading-body)!important}.module-empty{padding:23px 18px}.module-stat-row{flex-wrap:wrap;gap:23px}.module-stat{flex:105px;padding:8px 0 17px}.module-stat strong,.workspace.large-text .module-stat strong{font-size:2.75rem!important}.module-stat span{color:#526c7a}.module-actions{align-items:stretch;gap:12px}.module-actions:not(.compact)>button{flex:160px}.module-actions.compact{gap:14px}.module-actions :is(.primary,.secondary){padding:11px 15px}.module-lesson-list>button,.module-lesson-list>.bookmark-row{gap:17px;padding:17px 0}.module-lesson-list small{color:#526c7a;margin-bottom:6px;font-size:var(--reading-small)!important}.module-lesson-list strong{font-weight:600}.mini-timeline{gap:20px}.mini-timeline>button{align-items:flex-start;gap:14px}.mini-timeline small{margin-top:7px}.correct-dot,.retry-dot{flex-shrink:0;width:33px;height:33px;font-size:1rem!important}.segmented{flex-wrap:wrap;gap:5px;width:max-content;max-width:100%;padding:4px}.segmented button{padding:9px 15px}.daily-bars{grid-template-columns:repeat(7,minmax(0,1fr));align-items:end;gap:20px 6px;height:auto;display:grid}.daily-bars>div{width:100%;min-width:0;height:auto}.daily-bars>div>span,.daily-bars small{text-align:center;overflow-wrap:anywhere;width:100%;font-size:var(--reading-small)!important}.daily-bars .bar-track{flex:none;height:130px}.calendar-grid{gap:4px}.calendar-grid button{min-width:0;min-height:42px;padding:5px 0;font-size:var(--reading-small)!important}.calendar-grid>span{padding-inline:0}.metric-list{gap:24px}.metric-list>div{gap:9px}.metric-list span,.metric-list strong{font-size:var(--reading-body)!important}.meter{height:9px}.progress-ring strong{font-size:2.875rem!important}.progress-ring small{font-size:1.375rem!important}.progress-ring>span{color:#526c7a}.completion-chips{gap:10px}.completion-chips button{text-align:left;padding:10px 13px}.badge-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,165px),1fr));gap:14px}.badge-grid>div{padding:20px 14px}.badge-grid>div:not(.earned){color:#607987}.badge-grid .earned strong{color:#806822}.badge-grid span{font-size:2rem!important}.badge-grid strong{margin-block:10px 7px}.weak-unit{gap:14px;padding:18px 0}.weak-unit small{color:#526c7a;margin-left:0;font-size:var(--reading-small)!important}.weak-unit .text-button{min-height:40px}.mistake-list>div{margin-bottom:20px;padding-bottom:20px}.mistake-list small{color:#526c7a;margin-block:8px 13px}.rating-picker{gap:9px}.rating-picker button{min-width:0;min-height:48px;font-size:1.25rem!important}.before-after{grid-template-columns:repeat(auto-fit,minmax(min(100%,190px),1fr));gap:16px}.before-after>div{padding:20px}.before-after small{color:#526c7a}.card-list{gap:17px;max-height:none}.card-flip{min-height:125px;padding:23px 20px}.card-tools{flex-wrap:wrap;gap:12px;padding:11px 15px}.card-tools>button{min-width:40px}.flashcard{gap:24px;min-height:210px;padding:26px 22px}.bookmark-row>button:first-child{text-align:left;flex:1;min-width:0}.bookmark-row>button:last-child{flex-shrink:0;min-width:40px}.task-list{gap:17px}.task-list>div>button{flex-shrink:0;min-width:40px}.inline-form{flex-wrap:wrap;gap:11px}.inline-form input{flex:190px}.inline-form .primary{min-width:46px;min-height:46px}.check-chips{gap:11px}.check-chips label{gap:9px;padding:10px 12px}.recommend-label{white-space:normal;padding:6px 11px}.timer-digits,.workspace.large-text .timer-digits{letter-spacing:0;overflow-wrap:anywhere;font-size:3.5rem!important}.timer-digits span{padding-inline:3px;font-size:inherit!important}.module-timer>label{flex-wrap:wrap;gap:13px}.module-timer input{width:105px}.module-quiz legend{color:#526c7a;font-size:var(--reading-body)!important}.module-quiz>form{gap:18px}.module-quiz>form label{gap:10px}.module-quiz .primary{min-height:46px}.quiz-feedback{padding:22px 18px}.quiz-feedback strong{font-size:var(--reading-body)!important}.quiz-results>strong{font-size:2rem!important}.quiz-results>p{padding-block:17px}.quiz-results small{margin-top:7px}.confidence-list{gap:16px}.confidence-list button{padding:19px}.confidence-list small{margin-top:8px}.preset-panel{padding:28px}.preset-buttons{flex-wrap:wrap;gap:13px}.preset-buttons button{padding:11px 17px}.catalog-toolbar{align-items:center;gap:17px}.catalog-toolbar .search-box{flex:300px}.catalog-toolbar>span,.catalog-toolbar .text-button{white-space:normal}.module-catalog{grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));gap:18px}.module-catalog>article{grid-template-columns:minmax(0,1fr) 76px;gap:14px;padding:23px;display:grid}.module-catalog .module-number{background:0 0;grid-column:1/-1;justify-content:start;width:auto;height:auto}.module-catalog>article>div:nth-child(2){min-width:0}.module-catalog h3{margin:8px 0 12px;font-size:1.25rem!important}.module-catalog p{color:#526c7a;font-size:var(--reading-body)!important}.catalog-controls{gap:16px}.catalog-controls>div{flex-wrap:wrap;justify-content:center;gap:4px}.catalog-controls .icon-button{min-width:36px;min-height:40px;padding:6px}.add-module-button{text-align:center;min-height:58px;padding:20px}.workspace.large-text .workspace-module :is(label,strong,button,input,select,textarea),.large-text .workspace-module :is(label,strong,button,input,select,textarea){font-size:var(--reading-body)!important}.app-shell .workspace.large-text .module-note{line-height:1.8;font-size:var(--reading-small)!important}.workspace.large-text .module-stat strong{font-size:2.75rem!important}}@media (min-width:761px) and (max-width:1150px){.study-layout{grid-template-columns:minmax(0,1fr)}.study-aside,.small-date{display:none}.collapsed-board{flex-wrap:wrap}.collapsed-board .mini-formula{border-bottom:1px solid #4e6578;border-right:0;flex-basis:100%;max-width:100%;padding:0 0 12px}.learning-steps{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));display:grid}.learning-steps>svg{display:none}.learning-steps button{background:#edf3f4;border-radius:7px;padding:10px 12px}.learning-steps button.current{background:#e0f1ec}.hero{flex-wrap:wrap;padding:28px}.hero-diagram{opacity:1;flex:100%;width:100%;max-width:400px;margin:30px auto 0;position:static;transform:none}}@media (min-width:761px){.workspace.large-text .progress-ring strong{font-size:2.875rem!important}.workspace.large-text .quiz-results>strong{font-size:2rem!important}.app-shell .notice{line-height:1.85;font-size:var(--reading-body)!important}}.help-trigger{color:#285e5b;min-height:48px;font-size:var(--reading-body,1.125rem);white-space:normal;background:#fff;border:1px solid #b4ccc9;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:8px 12px;display:inline-flex}.help-dialog{color:#183849;width:min(760px,100% - 32px);max-height:85dvh;font-size:var(--reading-body,1.125rem);background:#fff;border:1px solid #b4ccc9;border-radius:18px;margin:auto;padding:0;line-height:1.8;position:fixed;inset:0;overflow:auto}.help-dialog::backdrop{background:#132d4580}.help-content{padding:28px}.help-content header{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.help-content header h2{margin:0;line-height:1.5;font-size:1.5em!important}.help-content h3{margin:22px 0 10px;font-size:1.15em!important}.help-content header button{flex-shrink:0;min-width:48px;min-height:48px}.help-content ol{margin:0;padding-left:1.5em}.help-content li{overflow-wrap:anywhere;margin-bottom:12px;padding-left:.2em}.help-content>.primary{min-height:48px;font-size:inherit;margin-top:20px}.deck-toolbar{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:12px;margin-bottom:12px;display:flex}.demo-banner .help-trigger{color:#285e5b;margin-left:auto;font-size:var(--reading-body,1.125rem)!important}@media (max-width:760px){.help-content{padding:20px}.help-dialog{width:calc(100% - 24px);max-height:88dvh}}.module-info{margin-block:12px}.module-info summary{cursor:pointer;min-height:44px;font-size:var(--reading-body,1.125rem);padding-block:10px}.module-info p{overflow-wrap:anywhere}.growth-hub{font-size:var(--reading-body,1.125rem);line-height:1.8}.growth-hub h2{margin:0 0 20px;font-size:1.3em!important}.growth-hub h3{margin:0 0 12px;font-size:1.12em!important}.growth-hub button,.growth-hub input{white-space:normal;min-height:48px;font-size:var(--reading-body,1.125rem)!important}.growth-hub *{overflow-wrap:anywhere;min-width:0}.growth-overview{background:#e9f4f0;border-radius:18px;grid-template-columns:1fr 2fr;gap:28px;margin-bottom:24px;padding:28px;display:grid}.growth-overview>div{flex-direction:column;gap:10px;display:flex}.growth-level{color:#22594f;font-size:2.6em;line-height:1.3}.growth-label{font-size:var(--reading-small,1rem);color:#526c7a}.growth-next{justify-content:center}.growth-next progress{accent-color:#007574;width:100%;height:15px}.growth-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));gap:24px;display:grid}.growth-panel{background:#fff;border:1px solid #d6e3e4;border-radius:15px;margin-bottom:24px;padding:26px}.xp-chart{grid-template-columns:repeat(7,minmax(0,1fr));align-items:end;gap:8px;display:grid}.xp-chart>div{font-size:var(--reading-small,1rem);flex-direction:column;align-items:center;gap:6px;display:flex}.xp-bar-track{background:#f0f5f3;border-radius:7px;align-items:flex-end;width:100%;height:140px;display:flex;overflow:hidden}.xp-bar-track i{background:#27877b;border-radius:6px 6px 0 0;width:100%;display:block}.growth-styles{border:0;flex-wrap:wrap;gap:10px;margin:0 0 20px;padding:0;display:flex}.growth-styles legend{margin-bottom:10px;font-weight:700}.growth-style{color:#24424e;border:1px solid #b5c9c8;border-radius:10px;flex-wrap:wrap;align-items:center;gap:7px;padding:10px 12px;display:flex}.growth-style.selected{outline-offset:2px;outline:2px solid #177d74}.growth-style small{font-size:var(--reading-small,1rem)}.style-teal{border-left:7px solid #007574}.style-blue{border-left:7px solid #215a85}.style-plum{border-left:7px solid #70416f}.growth-section-title,.exam-top,.exam-actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;display:flex}.growth-section-title h2{align-items:center;gap:8px;display:flex}.exam-list article{border-top:1px solid #dce7e5;padding:22px 0}.exam-list article p{margin-block:8px}.exam-question{background:#f3f7f6;border-radius:12px;margin:22px 0;padding:24px}.exam-question label{gap:10px;font-weight:700;display:grid}.exam-question input{background:#fff;border:1px solid #9eb9b4;border-radius:8px;width:100%;padding:14px}.exam-confirm{background:#f5f7ec;border:1px solid #adbcaa;border-radius:12px;margin-top:20px;padding:20px}.exam-confirm button{margin:8px 12px 0 0}.exam-result{background:#edf6f1;border-radius:12px;gap:14px;padding:24px;display:grid}.exam-result>strong{font-size:2em}.sample-ranking{margin-top:24px}.sample-ranking ol{padding:0;list-style:none}.sample-ranking li{border-bottom:1px solid #dae5e1;grid-template-columns:55px 1fr auto;gap:10px;padding:12px;display:grid}.sample-ranking .is-you{background:#e6f3ec;font-weight:700}.exam-review{margin-top:26px}.exam-review details{border-top:1px solid #d5e1de;padding:12px 0}.exam-review summary,.growth-panel>summary{cursor:pointer;padding-block:8px}.exam-history{gap:12px;margin-top:16px;display:grid}.xp-toast{z-index:80;pointer-events:none;color:#fff;font-size:var(--reading-body,1.125rem);background:#183f39;border-radius:16px;padding:14px 22px;animation:.22s ease-out xp-appear;position:fixed;bottom:24px;right:24px;box-shadow:0 8px 24px #132d4526}@keyframes xp-appear{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.xp-toast{animation:none}}.app-shell.growth-accent-blue .primary{color:#fff!important;background:#215a85!important;border-color:#215a85!important}.app-shell.growth-accent-plum .primary{color:#fff!important;background:#70416f!important;border-color:#70416f!important}.app-shell.growth-accent-blue .nav-item.active{color:#215a85!important;background:#edf3f9!important}.app-shell.growth-accent-plum .nav-item.active{color:#70416f!important;background:#f6eef7!important}.app-shell.growth-frame-line :is(.lesson-card,.workspace-module,.growth-panel){border:3px double #58847b}.app-shell.growth-frame-gold :is(.lesson-card,.workspace-module,.growth-panel){border:2px solid #967334;box-shadow:0 0 0 3px #f6efd9}@media (max-width:760px){.growth-overview{grid-template-columns:1fr;padding:20px}.growth-panel{padding:18px}.xp-chart{gap:4px}.xp-toast{max-width:calc(100% - 24px);bottom:14px;right:12px}.exam-question{padding:18px}.exam-actions{justify-content:flex-start}.xp-date>span{text-align:center;display:block}}.daily-recall{font-size:var(--reading-body,1.125rem);background:#f1f8f4;border:1px solid #bbd5ce;border-radius:14px;margin-bottom:20px;padding:18px 22px;line-height:1.7}.daily-heading{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.daily-heading span{font-size:var(--reading-small,1rem);color:#526c7a}.daily-heading button{margin-left:auto}.daily-prompt{margin-block:14px}.daily-answer{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.daily-answer strong{color:#215d53;font-size:1.2em}.daily-answer span,.daily-done{color:#346d61;font-size:var(--reading-small,1rem)}.daily-done,.daily-profile-link{margin-bottom:16px}.profile-grade-label{gap:10px;max-width:480px;display:grid}.profile-grade-label select{font-size:var(--reading-body,1.125rem);background:#fff;border:1px solid #a7bfba;border-radius:9px;min-height:48px;padding:12px}@media (max-width:760px){.daily-recall{padding:18px}.daily-heading{gap:8px}}.learning-dialog{width:min(40rem,100vw - 2rem);max-width:calc(100vw - 2rem);max-height:calc(100dvh - 2rem);color:var(--ink,#153936);font-size:var(--reading-body,1.125rem);overflow-wrap:anywhere;background:#fff;border:1px solid #bbd2d0;border-radius:20px;padding:1.5rem;line-height:1.8;overflow:auto}.learning-dialog::backdrop{background:#0e232173}.learning-dialog h2{margin:0 0 1rem;font-size:1.5rem;line-height:1.5}.learning-dialog .button-row{flex-wrap:wrap}.learning-dialog button{white-space:normal;min-height:48px}.onboarding-guide{font-size:var(--reading-body,1.125rem);background:#f0faf7;border:1px solid #bbd2d0;border-radius:16px;margin-bottom:1.5rem;padding:1rem;line-height:1.8}.onboarding-guide p{margin:0 0 .5rem}.hint p{overflow-wrap:anywhere}@media (max-width:760px){.learning-dialog .button-row{flex-direction:column;align-items:stretch;display:flex}.onboarding-guide .button-row{flex-wrap:wrap}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}.vocabulary-test{font-size:var(--reading-body,1.125rem);min-width:0;line-height:1.8}.vocabulary-test *{box-sizing:border-box;min-width:0}.vocabulary-test h3,.vocabulary-test h4{overflow-wrap:anywhere;line-height:1.6;font-size:1.3em!important}.test-filters{grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));gap:16px;margin:20px 0;display:grid}.test-filters label,.test-question form{flex-direction:column;gap:8px;display:flex}.test-filters select,.test-question input{background:#fff;border:1px solid #b8cfc7;border-radius:8px;width:100%;font:inherit!important;min-height:48px!important;padding:10px!important;line-height:1.6!important}.vocabulary-test button{overflow-wrap:anywhere;min-height:44px;font-size:inherit!important;white-space:normal!important;line-height:1.6!important}.test-range{border:1px solid #cddcd6;border-radius:10px;gap:10px;margin:16px 0;padding:16px;display:grid}.test-range label{overflow-wrap:anywhere;align-items:center;gap:12px;display:flex}.test-range input{flex-shrink:0;width:20px;height:20px}.test-choices,.test-history{gap:12px;margin:16px 0;display:grid}.test-summary details{overflow-wrap:anywhere;border-bottom:1px solid #cddcd6;padding:16px 0}.test-summary summary{cursor:pointer}.test-question{border:1px solid #cddcd6;border-radius:12px;margin:16px 0;padding:20px}.test-question p,.test-question h4{overflow-wrap:anywhere}.test-answer{font-size:1.3em;font-weight:700}.test-ledger-import{margin:16px 0}.test-ledger-import input{font:inherit;width:100%;display:block}.test-archive-manager{border:1px solid #cddcd6;border-radius:10px;margin:20px 0;padding:16px}.test-archive-manager summary{cursor:pointer;overflow-wrap:anywhere}.test-archive-manager fieldset{border:1px solid #cddcd6;gap:10px;max-height:20rem;margin:12px 0;padding:12px;display:grid;overflow:auto}.test-archive-manager fieldset label{overflow-wrap:anywhere;align-items:center;gap:12px;display:flex}.test-archive-manager input[type=checkbox]{flex-shrink:0;width:20px;height:20px}.test-archive-manager input[type=file]{width:100%;font:inherit;margin:8px 0;display:block}.test-archive-manager button{margin:8px 8px 8px 0}.polynomial-interaction{font-size:var(--reading-body,1.125rem);background:#fff;border:1px solid #c8dce9;border-radius:16px;min-width:0;margin:24px 0;padding:clamp(16px,3vw,28px);line-height:1.7}.polynomial-interaction *{box-sizing:border-box;min-width:0}.poly-header{justify-content:space-between;align-items:center;gap:12px;display:flex}.polynomial-interaction h2{line-height:1.5;margin:0!important;font-size:1.4em!important}.poly-help-button{color:#236575;background:#fff;border:1px solid #bad0da;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;padding:8px;display:flex}.poly-modes{background:#f0f5f8;border-radius:12px;gap:6px;margin:18px 0 10px;padding:5px;display:flex}.poly-modes button{color:#466575;background:0 0;border:1px solid #0000;border-radius:8px;flex:1;padding:10px}.poly-modes button[aria-pressed=true]{color:#174974;background:#fff;border-color:#b9d2df;font-weight:700;box-shadow:0 1px 3px #15384912}.poly-tools{color:#617784;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.polynomial-interaction button{white-space:normal;overflow-wrap:anywhere;min-height:44px;line-height:1.6;font:inherit!important}:is(.polynomial-interaction button:focus-visible,.polynomial-interaction select:focus-visible){outline-offset:3px;outline:3px solid #086f7d}.poly-progress{gap:8px;margin:0 0 20px;padding:0;list-style:none;display:flex}.poly-progress li{color:#647b89;white-space:normal;border-bottom:3px solid #e2eaf0;flex:1;justify-content:center;align-items:center;gap:6px;padding:7px 4px;display:flex}.poly-progress li.done{color:#24587a;border-color:#9dc4df}.poly-progress li[aria-current=step]{color:#174974;border-color:#24668e;font-weight:700}.poly-progress span{font-size:inherit}.poly-step-heading{justify-content:space-between;align-items:flex-start;gap:12px;margin:20px 0 16px;display:flex}.poly-step-heading h3{line-height:1.6;margin:0!important;font-size:1.15em!important}.poly-step-heading>span{white-space:nowrap;color:#617784}.app-shell .polynomial-interaction .poly-expression{overflow-wrap:anywhere;background:#f1f6fa;border-radius:12px;margin:12px 0 20px;padding:16px;font-weight:700;line-height:1.5;font-size:1.65em!important}.poly-formula-context{overflow-wrap:anywhere;color:#425f72;font-size:1.15em}.poly-term-bank{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0;display:grid}.poly-term-button{border:2px solid #0000;border-radius:12px;justify-content:center;align-items:center;padding:16px;transition:background-color .12s,border-color .12s;display:flex}.app-shell .polynomial-interaction .poly-term-button strong{line-height:1.6;font-size:1.65em!important}.poly-color-0{color:#174974;background:#e8f0fa;border-color:#8baecf}.poly-color-1{color:#784112;background:#fff0df;border-color:#d6a568}.poly-color-2{color:#3b4c58;background:#f1f3f4;border-color:#abb9c3}.poly-term-button[aria-pressed=true]{outline-offset:2px;border-style:dashed;outline:3px solid #076d78}.poly-result{color:#225139;background:#eaf5ee;border:1px solid #b4d8c0;border-radius:12px;padding:18px}.poly-result p{overflow-wrap:anywhere;margin:4px 0 12px}.app-shell .polynomial-interaction .poly-result .poly-expression{background:#fff9;font-size:1.8em!important}.poly-coefficients{font-size:1.35em;font-weight:600}.poly-final-expression{color:#225139;background:#eaf5ee}.poly-reason{overflow-wrap:anywhere;padding:12px 0}.poly-feedback{color:#71400d;background:#fff6e8;border-left:4px solid #b77617;padding:12px}.poly-operation,.poly-sign-choices{gap:10px;margin:12px 0;display:flex}.poly-operation button,.poly-sign-choices button{color:#2c566d;background:#fff;border:1px solid #aac6d5;border-radius:10px;flex:1;padding:10px}.poly-operation button[aria-pressed=true],.poly-sign-choices button[aria-pressed=true]{background:#e9f5f8;border:2px solid #217088;font-weight:700}.poly-sign-choices button{min-height:56px;font-size:1.2em!important}.poly-degree,.poly-check-choice{flex-direction:column;gap:8px;margin:16px 0;display:flex}.polynomial-interaction select{min-height:48px;font:inherit;color:#243f52;background:#fff;border:1px solid #a5bfce;border-radius:8px;max-width:100%;padding:10px}.poly-hint{margin:14px 0}.poly-hint p{overflow-wrap:anywhere;background:#fff6e8;border-radius:8px;margin:8px 0;padding:12px}.poly-main-action{justify-content:center;width:100%;min-height:52px!important}.poly-secondary-actions{flex-wrap:wrap;justify-content:space-between;gap:8px;margin-top:10px;display:flex}.poly-secondary-actions button{align-items:center;gap:6px;display:flex}.poly-final-reason{margin:16px 0}.poly-final-reason summary{cursor:pointer}.poly-static-reason li{overflow-wrap:anywhere;margin:16px 0}.poly-motion{align-items:center;gap:10px;margin:20px 0;display:flex}.poly-motion input{flex-shrink:0;width:20px;height:20px}.poly-help-dialog{font-size:var(--reading-body,1.125rem)}.poly-static *{scroll-behavior:auto!important;transition:none!important;animation:none!important}@media (prefers-reduced-motion:reduce){.polynomial-interaction *{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@media (max-width:600px){.poly-progress{gap:4px}.poly-progress li{flex-direction:column;gap:0}.poly-step-heading{flex-direction:column;gap:4px}.app-shell .polynomial-interaction .poly-expression{font-size:1.5em!important}.poly-term-button{padding:14px}.poly-help-dialog .help-content{padding:20px}}.poly-step-heading h3:focus{outline:none}.offline-panel{background:#fff;border:1px solid #dce4e5;border-radius:18px;min-width:0;margin-block:24px;padding:22px}.offline-heading{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.offline-heading h2{align-items:center;gap:8px;margin:0 0 8px;font-size:1.3rem;display:flex}.offline-panel p{line-height:1.8}.offline-panel button{min-height:44px;font:inherit;cursor:pointer;background:#fff;border:1px solid #c5d4d5;border-radius:9px;justify-content:center;align-items:center;gap:6px;padding:10px 12px;display:inline-flex}.offline-panel button:disabled{opacity:.5;cursor:not-allowed}:is(.offline-panel button:focus-visible,.offline-panel input:focus-visible){outline-offset:3px;outline:3px solid #3d9398}.offline-explanation{background:#f3f7f7;border-radius:12px;padding:10px 16px;font-size:.9rem}.offline-explanation p{margin:8px 0}.offline-storage{color:#435a62;font-size:.9rem}.offline-notice{background:#fff4d6;border-radius:10px;gap:8px;padding:12px;display:flex}.offline-error{color:#8a3023;background:#fff0ec;border-radius:10px;padding:12px}.offline-search{flex-direction:column;gap:7px;max-width:480px;margin:16px 0;display:flex}.offline-search input{width:100%;font:inherit;border:1px solid #bbcacc;border-radius:9px;padding:11px}.offline-actions{flex-wrap:wrap;gap:9px;margin-block:14px;display:flex}.offline-panel .offline-primary{color:#fff;background:#266765;border-color:#266765}.offline-materials{max-height:600px;margin:0;padding:0;list-style:none;overflow:auto}.offline-materials li{border-bottom:1px solid #e0e8e8;justify-content:space-between;align-items:center;gap:16px;padding:13px 2px;display:flex}.offline-materials li>label{cursor:pointer;flex:1;align-items:flex-start;gap:12px;min-width:0;display:flex}.offline-materials input{flex-shrink:0;width:20px;height:20px;margin-top:3px}.offline-materials strong{overflow-wrap:anywhere;display:block}.offline-materials small{color:#5f6e72;margin-top:5px;line-height:1.5;display:block}.offline-materials small.offline-saved{color:#1a6c43}.offline-materials li>div{flex-shrink:0;gap:8px;display:flex}.offline-progress{gap:8px;margin:12px 0;display:grid}.offline-progress progress{width:100%}.offline-confirm{background:#fff5e3;border:1px solid #d7bf8c;border-radius:12px;padding:14px}.offline-confirm button{margin-right:8px}@media (max-width:600px){.offline-panel{padding:15px}.offline-heading{flex-direction:column}.offline-materials li{flex-direction:column;align-items:stretch;gap:10px}.offline-materials li>div{padding-left:32px}.offline-actions button{flex-grow:1}.offline-panel button{font-size:.9rem}.offline-explanation{padding:8px 12px}}.offline-dialog{box-sizing:border-box;width:min(480px,100vw - 32px);max-height:calc(100dvh - 48px);margin:auto;position:fixed;inset:0;overflow:auto;box-shadow:0 18px 70px #10252640}.offline-dialog::backdrop{background:#10252680}.offline-dialog h3{margin:0 0 12px}.offline-dialog p{overflow-wrap:anywhere}.offline-dialog .offline-actions{margin-bottom:0}.today-home{background:linear-gradient(120deg,#eff9f6,#fff 85%);border:1px solid #bddbd7;border-radius:22px;grid-template-columns:minmax(0,1.4fr) minmax(240px,1fr);gap:28px;margin:0 0 28px;padding:clamp(20px,4vw,36px);display:grid}.today-home h1,.today-session h1{color:#153d42;margin:10px 0 12px;font-size:clamp(1.6rem,3vw,2.15rem);line-height:1.4}.today-home p,.today-session p{line-height:1.75}.today-tags{flex-wrap:wrap;gap:8px;margin:16px 0 22px;display:flex}.today-tags span{color:#244b47;background:#dfefeb;border-radius:8px;padding:5px 10px;font-size:.875rem}.today-start{min-height:56px;padding:14px 24px}.today-plan{color:#234340}.today-plan summary{cursor:pointer;align-items:center;gap:8px;min-height:48px;font-weight:700;display:flex}.today-plan summary:before{content:"＋"}.today-plan[open] summary:before{content:"−"}.today-plan>label{margin:12px 0 6px;display:block}.today-plan input[type=date]{min-width:0;max-width:100%;min-height:48px;font:inherit;background:#fff;border:1px solid #a8c4c0;border-radius:10px;padding:10px;display:block}.today-plan fieldset{border:0;flex-wrap:wrap;gap:8px;margin:16px 0;padding:0;display:flex}.today-plan legend{margin:0 0 8px;font-weight:700}.today-plan fieldset label{cursor:pointer;background:#fff;border:1px solid #b6ccc7;border-radius:9px;align-items:center;gap:8px;min-height:48px;padding:8px 12px;display:flex}.today-plan input[type=checkbox]{accent-color:#137775;flex-shrink:0;width:20px;height:20px}.today-home-plan .footnote,.today-save{color:#4d6664;font-size:.875rem}.today-course-start{margin:16px 0 26px}.today-session{overflow-wrap:anywhere;background:#fff;border:1px solid #d4e1df;border-radius:20px;width:100%;max-width:760px;margin:0 auto;padding:clamp(18px,3vw,32px)}.today-session-top{justify-content:space-between;align-items:center;gap:12px;display:flex}.today-session-top>span{white-space:nowrap;font-weight:700}.today-session progress{accent-color:#0c8580;width:100%;height:7px;margin:20px 0 28px;display:block}.today-question-head .question-text{color:#213e42;background:#f2f7f5;border-radius:14px;margin:16px 0 26px;padding:20px;font-size:1.2rem;line-height:1.9}.today-session form>label{margin-bottom:10px;font-weight:700;display:block}.today-session input#today-answer{color:#183c41;background:#fff;border:2px solid #a7bfbc;border-radius:12px;width:100%;min-width:0;min-height:58px;padding:15px;font-size:1.25rem}.today-session input#today-answer:focus{outline-offset:2px;border-color:#087b78;outline:2px solid #bee5dc}.today-session .math-keypad{flex-wrap:wrap;gap:10px;margin-top:12px;display:flex}.today-session .math-keypad button{min-width:50px;min-height:48px;font-size:1.2rem}.today-action-bar{z-index:5;background:#fff;padding:8px 0;position:sticky;bottom:12px}.today-action-bar .primary{justify-content:center;width:100%;min-height:56px;font-size:1.05rem}.today-support{flex-wrap:wrap;gap:10px;margin:18px 0;display:flex}.today-support button,.today-session .text-button{min-height:48px}.today-session .result{margin:20px 0}.today-session .hint{margin:16px 0}.today-session .hint p{margin:10px 0}.today-explanation{background:#f2f7f5;border-radius:12px;margin-top:20px;padding:20px}.today-explanation h2{margin-bottom:16px;font-size:1.2rem}.today-explanation>strong{font-size:1.45rem}.today-explanation ol{margin:16px 0;padding-left:24px}.today-explanation li{margin:10px 0;line-height:1.8}.today-finish>svg{color:#0b8174}.today-finish ul{margin:20px 0;padding:0;list-style:none}.today-finish li{border-bottom:1px solid #d9e5e2;justify-content:space-between;gap:16px;padding:14px 0;display:flex}.today-finish li strong{font-size:.9rem}@media (max-width:700px){.today-home{grid-template-columns:minmax(0,1fr);gap:16px;padding:20px}.today-home h1{font-size:1.9rem}.today-start{justify-content:center;width:100%}.today-session{border-radius:15px;padding:16px}.today-session-top{font-size:.9rem}.today-session-top .text-button{padding:4px 0}.today-question-head .question-text{font-size:var(--reading-body,1.125rem);padding:16px}.today-session input#today-answer{font-size:1.25rem}.today-action-bar{bottom:calc(8px + env(safe-area-inset-bottom));box-shadow:0 0 0 6px #fff}.today-support{grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.today-support button{white-space:normal;justify-content:center;padding:10px 6px}.today-support>.text-button{grid-column:1/-1}.today-finish li{flex-direction:column;gap:4px}.today-plan input[type=date]{width:100%}.today-plan fieldset label,.today-home-plan .footnote,.today-save{font-size:var(--reading-small,1rem)}}@media (min-width:761px){.app-shell .icon-button{min-width:44px;min-height:44px}.app-shell .study-heading>button,.app-shell .learning-steps button,.app-shell .board-controls button,.app-shell input[type=range]{min-height:44px}}.app-shell .board-controls .icon-button{min-width:44px;min-height:44px}.app-shell .breadcrumb button{min-height:44px}.app-shell .board-controls .slide-dots{flex-wrap:wrap}.app-shell .board-controls .slide-dots button{min-width:44px;min-height:44px}.app-shell .board-controls .slide-dots button:after{width:6px;height:6px;inset:calc(50% - 3px) auto auto calc(50% - 3px)}@media (min-width:761px) and (max-width:1023px) and (orientation:portrait){.app-shell .mobile-header{z-index:40;border-bottom:1px solid var(--line);background:#fff;justify-content:space-between;align-items:center;gap:12px;min-height:68px;padding:9px 20px;display:flex;position:sticky;top:0}.app-shell .mobile-header .brand{font-size:1.25rem}.app-shell .sidebar{display:none}.app-shell .sidebar.is-open{width:100%;height:auto;min-height:0;max-height:none;padding:20px;display:flex;position:static;inset:auto;overflow:visible}.app-shell .sidebar>.brand,.app-shell .sidebar-label,.app-shell .sidebar-note{display:none}.app-shell .sidebar-bottom{margin-top:16px}.app-shell .main-wrap{margin-left:0}}