:root{--bg:#f8f7f2;--ink:#193b37;--muted:#64736d;--line:#dce2d9;--teal:#176c5d;--lime:#dbe9a5;--paper:#fff;--orange:#e5a56f;--serif:Georgia,'Times New Roman',serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,'Segoe UI',sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,textarea:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #d77a3d;outline-offset:4px}button{border:1px solid var(--line);border-radius:9px;padding:10px 17px;background:white;color:var(--ink);font-weight:650}button:hover{border-color:var(--teal);background:#f0f5eb}button:disabled{opacity:.5;cursor:default}a{color:var(--teal)}header{height:100px;max-width:1440px;margin:auto;padding:18px 5%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-size:23px;font-weight:750;line-height:1.1}.brand i{font-family:var(--serif);font-weight:400}.brand small{display:block;font-size:9px;letter-spacing:2.8px;margin-top:9px}.brandmark{background:var(--ink);color:var(--lime);border-radius:12px;display:grid;place-items:center;width:44px;height:48px;font-size:34px}.head-actions{display:flex;gap:10px;align-items:center}.subtle{background:transparent;border:0;font-size:14px}.grade-pill{background:var(--lime);border-color:transparent;font-size:14px}.primary{background:var(--teal);color:white;border-color:var(--teal)}.primary:hover{background:var(--ink);color:white}.textbutton{padding:0;border:0;background:none;font-size:13px;text-decoration:underline;font-weight:400}.skip{position:absolute;top:-80px;background:white;padding:12px;z-index:20}.skip:focus{top:0}main{max-width:1440px;margin:auto;min-height:75vh}.landing{padding:58px 5% 60px}.hero{display:grid;grid-template-columns:1.08fr 1fr;gap:40px;align-items:center}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:2.4px;font-weight:750;display:flex;gap:9px;align-items:center}.dot{width:7px;height:7px;background:var(--teal);border-radius:50%;display:inline-block}h1,h2,h3,p{margin-top:0}h1{font-family:var(--serif);font-weight:400;font-size:clamp(46px,5vw,74px);line-height:1.08;letter-spacing:-2px;margin:24px 0}h1 em{color:var(--teal);font-weight:400}h2{font-family:var(--serif);font-size:34px;line-height:1.2;font-weight:400}h3{font-size:19px;line-height:1.35;margin-bottom:10px}.intro{font-size:18px;max-width:480px;color:var(--muted)}.herofacts{display:flex;gap:18px;font-size:12px;color:var(--muted);margin-top:25px}.heroart{background:#e8eddf;border-radius:110px 14px 110px 14px;aspect-ratio:1.12;position:relative;overflow:hidden}.heroart svg{width:100%;height:100%;display:block}.artbadge{position:absolute;left:20px;bottom:28px;border-radius:30px;background:white;padding:8px 16px;font-size:12px;box-shadow:0 8px 25px #193b3710}.grade-section{margin-top:48px}.sectionline{display:flex;align-items:center;gap:18px;justify-content:space-between}.sectionline h2{font-family:inherit;font-size:18px;font-weight:700;margin:0}.sectionline>span{font-size:12px;color:var(--muted)}.grades{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:18px}.grade-card{text-align:left;border-radius:14px;padding:24px;position:relative;background:var(--paper);transition:transform .2s}.grade-card:hover{transform:translateY(-4px)}.grade-card .num{font-family:var(--serif);font-size:43px;font-weight:400;line-height:1.2}.grade-card p{font-size:13px;color:var(--muted);margin:10px 30px 0 0;font-weight:400}.grade-card .arrow{position:absolute;right:22px;bottom:22px;font-size:23px}.grade-card:nth-child(2){background:#eef2dd}.grade-card:nth-child(3){background:#f4e9dc}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 20px}.chip{font-size:11px;letter-spacing:.5px;border:1px solid var(--line);border-radius:30px;padding:4px 11px;background:white}.workspace{padding:30px 5% 60px}.dashboard-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.dashboard-top h1{font-size:37px;letter-spacing:-.8px;margin:8px 0}.dashboard-top p{color:var(--muted);font-size:14px;margin:0}.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);padding-bottom:12px;overflow:auto;white-space:nowrap;margin-bottom:28px}.tab{background:transparent;border:0;border-radius:8px;color:var(--muted);font-size:14px}.tab.active{background:var(--ink);color:white}.lesson-layout{display:grid;grid-template-columns:265px minmax(0,1fr);gap:28px;align-items:start}.sidebar{position:sticky;top:20px;max-height:82vh;overflow:auto;padding-right:7px}.weekgroup{margin-bottom:16px}.weeklabel{font-size:10px;text-transform:uppercase;letter-spacing:1.5px;color:var(--muted);margin:0 0 7px 8px}.lessonbtn{display:flex;width:100%;align-items:flex-start;text-align:left;gap:10px;border:0;background:transparent;padding:10px;border-radius:9px;font-size:12px;line-height:1.4;margin-bottom:3px}.lessonbtn.active{background:#e4ecdc}.lessonbtn small{display:block;font-size:10px;color:var(--muted);font-weight:450;margin-top:3px}.lessonnum{min-width:24px;height:24px;display:grid;place-items:center;border:1px solid var(--line);border-radius:7px;font-size:10px;font-weight:500;background:white}.lessonbtn.active .lessonnum{background:var(--teal);color:white;border-color:var(--teal)}.lessonhead{background:var(--ink);color:white;border-radius:16px;padding:30px;position:relative;overflow:hidden}.lessonhead h2{font-size:34px;margin:14px 0 10px}.lessonhead p{max-width:580px;color:#dbe6da;font-size:15px;margin:0}.lessonhead .eyebrow{color:var(--lime)}.lessonhead:after{content:'↗';position:absolute;right:30px;top:10px;font-size:110px;line-height:1;color:#ffffff0c;pointer-events:none}.steps{display:flex;gap:12px;margin:22px 0;flex-wrap:wrap}.step{font-size:11px;background:#edf0e6;padding:5px 11px;border-radius:6px}.panel{background:white;border:1px solid var(--line);border-radius:14px;padding:26px;margin-bottom:20px}.panel h3{display:flex;gap:10px;align-items:center}.sectiontag{font-size:10px;letter-spacing:1.5px;color:var(--teal);margin-bottom:12px;font-weight:750;text-transform:uppercase}.fact-image{width:100%;height:auto;display:block;margin-bottom:15px}.facttext{font-size:16px;line-height:1.8;max-width:760px}.facttext p{margin-bottom:14px}.keyword{display:inline-flex;background:#edf2e8;border-radius:5px;padding:4px 10px;font-size:12px}.prompt{border-top:1px solid var(--line);padding-top:20px;margin-top:20px}.prompt:first-of-type{border:0;padding-top:0}.prompt label{display:block;font-size:15px;font-weight:650;margin-bottom:10px}textarea{width:100%;min-height:110px;resize:vertical;border:1px solid #ced8cd;border-radius:8px;background:#fcfcf9;padding:14px;color:var(--ink);font-size:15px;line-height:1.6}.actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:10px}.actions button{font-size:12px;padding:7px 12px}.saved{font-size:11px;color:var(--muted)}.feedback{font-size:14px;border-left:3px solid var(--teal);padding:10px 15px;background:#f0f5eb;margin-top:12px}.navbottom{display:flex;justify-content:space-between;align-items:center;margin-top:20px;gap:10px}.navbottom button{font-size:13px}.done{background:var(--lime);border-color:transparent}.studygrid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.studygrid .panel{margin:0}.filterbar{display:flex;justify-content:space-between;gap:15px;align-items:center;margin:20px 0}.filterbar select,.filterbar input{border:1px solid var(--line);border-radius:8px;background:white;padding:10px 14px;min-width:180px;color:var(--ink)}.concept-wrap{max-width:760px;margin:25px auto}.flash{min-height:290px;background:#e8eddf;border:1px solid #dae2d0;border-radius:20px;text-align:center;padding:35px;display:flex;flex-direction:column;justify-content:center;align-items:center;cursor:pointer}.flash .term{font-family:var(--serif);font-size:45px;font-weight:400;line-height:1.2;margin:20px 0}.flash .definition{font-size:20px;max-width:550px}.flash small{color:var(--muted)}.cardnav{display:flex;justify-content:space-between;align-items:center;margin:16px 0}.dictionary{margin-top:35px;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.dictcard{background:white;border:1px solid var(--line);border-radius:12px;padding:19px}.dictcard p{font-size:13px;color:var(--muted);margin:0}.practice{max-width:780px;margin:25px auto}.progressline{height:5px;background:#e1e7dc;border-radius:10px;margin:15px 0 25px;overflow:hidden}.progressline i{display:block;height:100%;background:var(--teal);transition:width .2s}.options{display:grid;gap:10px;margin:20px 0}.option{text-align:left;font-size:15px;font-weight:450;padding:16px 20px}.option.wrong{border-color:#b4763e;background:#fff2e5}.option.right{border-color:var(--teal);background:#e5efdc}.quiz-meta{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.lab-number{color:var(--teal);font-weight:800}.labsteps{padding-left:22px}.labsteps li{margin-bottom:10px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px;margin:15px 0}th,td{padding:10px;border:1px solid var(--line);text-align:left}th{background:#edf2e8}td input{width:100%;min-width:80px;border:0;background:#fafbf6;padding:8px;color:var(--ink)}.safety{font-size:14px;background:#f6eddd;border-radius:8px;padding:14px 18px;margin:15px 0}.extra-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.simulation{background:#ecf1e3;border-radius:12px;padding:20px;margin:20px 0}.simulation svg{width:100%;display:block}.simulation label{display:flex;gap:15px;align-items:center;font-size:13px}input[type=range]{accent-color:var(--teal);width:100%}.resultnum{font-family:var(--serif);font-size:35px;margin-top:10px}.numberfields{display:grid;grid-template-columns:1fr 1fr;gap:12px}.numberfields input{width:100%;border:1px solid var(--line);border-radius:7px;padding:12px}.numberfields label{font-size:12px}.warning{font-size:12px;color:var(--muted)}.mobile-select{display:none;width:100%;padding:10px;margin-bottom:15px;border:1px solid var(--line);background:white;border-radius:8px;color:var(--ink)}footer{max-width:1440px;margin:auto;padding:25px 5%;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted);align-items:center}dialog{max-width:610px;width:90%;border:1px solid var(--line);border-radius:18px;padding:30px;color:var(--ink)}dialog::backdrop{background:#183d3777}dialog p{font-size:14px}.close{float:right}.dialog-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.danger{color:#9c3b2d;border-color:#dfbeb7;font-size:12px}#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:10px 24px;border-radius:30px;font-size:13px;z-index:30;display:none}.empty{text-align:center;padding:40px;color:var(--muted)}.note{font-size:12px;color:var(--muted)}.smalltitle{font-size:28px}.note-link{font-size:12px;margin-top:10px}.badge{font-size:11px;color:var(--teal);background:#e7efdc;padding:4px 10px;border-radius:20px}.utility{display:flex;gap:10px;align-items:center}.utility button{font-size:12px}.screen-heading{display:flex;justify-content:space-between;gap:15px;align-items:center}.screen-heading h2{margin-bottom:5px}.lead{font-size:14px;color:var(--muted)}
@media(min-width:1300px){.landing{padding-top:65px}.heroart{max-height:445px}}@media(max-width:900px){.hero{gap:20px}.heroart{border-radius:70px 12px}.lesson-layout{grid-template-columns:210px minmax(0,1fr);gap:18px}.sidebar{padding-right:0}.panel{padding:22px}.dictionary{grid-template-columns:1fr 1fr}.studygrid{grid-template-columns:1fr}.intro{font-size:16px}.head-actions{gap:0}}@media(max-width:650px){header{height:82px;padding:14px 5%}.brand{font-size:18px}.brandmark{width:35px;height:40px;font-size:28px}.head-actions .subtle{font-size:0;padding:10px}.head-actions #read:before{content:'◖';font-size:20px}.head-actions #print{display:none}.grade-pill{font-size:11px;padding:7px 10px}.landing{padding-top:30px}.hero{grid-template-columns:1fr}.hero h1{font-size:49px;max-width:350px}.heroart{max-height:260px;aspect-ratio:1.5}.heroart svg{height:280px;margin-top:-12px}.intro{max-width:360px}.herofacts{margin:20px 0}.grades{grid-template-columns:1fr;gap:12px}.grade-section{margin-top:28px}.grade-card{padding:18px 22px}.grade-card .num{font-size:31px}.grade-card p{margin-top:5px}.sectionline>span{display:none}.workspace{padding-top:22px}.dashboard-top h1{font-size:31px}.dashboard-top .utility{display:none}.tabs{margin-bottom:20px;gap:0}.tab{font-size:12px;padding:9px 12px}.lesson-layout{display:block}.sidebar{display:none}.mobile-select{display:block}.lessonhead{padding:23px}.lessonhead h2{font-size:29px}.panel{padding:20px}.facttext{font-size:15px}.fact-image{margin-bottom:12px}.studygrid,.extra-grid{grid-template-columns:1fr}.dictionary{grid-template-columns:1fr}.flash{min-height:280px;padding:25px}.flash .term{font-size:35px}.flash .definition{font-size:18px}.filterbar{align-items:stretch;flex-direction:column}.screen-heading{align-items:start}.screen-heading h2{font-size:28px}footer{flex-wrap:wrap}.navbottom{flex-wrap:wrap}.chips{margin-bottom:12px}h2{font-size:29px}.artbadge{bottom:10px}.heroart svg text{font-size:16px}}
@media print{header,footer,.sidebar,.tabs,.actions,.navbottom,.utility,.mobile-select,.head-actions{display:none!important}.workspace{padding:0}.lesson-layout{display:block}.panel{break-inside:avoid;border:0}.lessonhead{background:white;color:black;padding:0}.lessonhead p,.lessonhead .eyebrow{color:black}textarea{min-height:120px;border-color:#aaa}body{background:white;color:black}.fact-image{max-height:150px;object-fit:contain}.prompt{break-inside:avoid}dialog{display:none}}

.cloudbar{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px;padding:8px 5%;background:#e9f0df;font-size:11px}.cloudbar button{font-size:11px;padding:4px 8px}.head-actions a{text-decoration:none}

.condition-label{display:block;font-size:13px;color:#536760;margin-bottom:6px}.condition-label+input{min-width:100px;max-width:220px;width:100%;box-sizing:border-box}

.exam-panel{border:2px solid #a06a28;background:#fff9ec}.exam-badge{font-weight:700;color:#7d4b17;letter-spacing:1px}
.unit-diagram{max-width:600px;margin:15px auto}.unit-diagram svg{width:100%;height:auto;background:#f3f5ee;border-radius:15px}.panel details{margin:14px 0}.panel summary{font-weight:650;cursor:pointer}.panel input[type=checkbox]{width:auto;margin-right:10px}#slidetext{max-width:900px;padding:15px 24px;margin:auto;background:#f3f5ee;color:#193b37;font-size:18px;line-height:1.65}#questions svg{display:block;max-width:340px;width:100%;margin:10px auto}@media print{details>p{display:block!important}.panel{break-inside:avoid}}

/* File and document actions share one clear, decorative document symbol. */
a:is([href$=".pdf" i],[href*=".pdf?" i],[href$=".doc" i],[href$=".docx" i],[href*=".docx?" i],[download]),.document-link,button:is(#print,#export,#downloadstudy,[data-action="export"]) { --document-action: 1; }
a:is([href$=".pdf" i],[href*=".pdf?" i],[href$=".doc" i],[href$=".docx" i],[href*=".docx?" i],[download])::before,.document-link::before,button:is(#print,#export,#downloadstudy,[data-action="export"])::before {content:"";display:inline-block;width:1.1em;height:1.25em;margin-inline-end:.45em;vertical-align:-.2em;background:currentColor;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 28'%3E%3Cpath d='M4 1h10l7 7v19H3V1h1zm1 2v22h14V10h-7V3H5zm9 1v4h4l-4-4zM7 14h10v2H7zm0 5h10v2H7z'/%3E%3C/svg%3E") center/contain no-repeat;}