@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');
.brand-mark svg{width:27px;height:27px}.sidebar .brand small{white-space:nowrap;font-size:8px;letter-spacing:1.1px}.plant svg{width:27px;height:27px}.icon-button.mobile-menu{display:none}@media(max-width:760px){.icon-button.mobile-menu{display:grid}}
:root{--ink:#203c36;--muted:#75817b;--green:#146b5c;--orange:#ee8850;--paper:#f7f8f5;--line:#e6eae4;--white:#fff;--shadow:0 8px 28px #1b443b06;font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0;font-size:14px;line-height:1.7}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.55}button,input,select,textarea{outline-offset:4px}button:focus-visible,a:focus-visible{outline:3px solid #ea9f40;outline-offset:4px}button{border:0;background:none}svg{display:block}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{line-height:1.4;letter-spacing:-.035em}h1{font-size:36px}h2{font-size:25px}h3{font-size:18px}p{margin-bottom:12px}.skip{position:fixed;left:20px;top:-60px;padding:10px 20px;background:var(--green);color:white;z-index:99}.skip:focus{top:10px}.sidebar{position:fixed;inset:0 auto 0 0;width:244px;background:white;border-right:1px solid var(--line);z-index:30;padding:33px 22px 24px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:11px;margin:0 7px 37px}.brand-mark{background:var(--green);color:#fff4cf;width:43px;height:43px;border-radius:13px;display:grid;place-items:center}.brand strong{font-size:22px;line-height:1.15;display:block;letter-spacing:-.8px}.brand small{font-size:9px;color:var(--muted);letter-spacing:1.6px;font-weight:700}.nav-label{color:#9aa39d;font-size:10px;font-weight:700;letter-spacing:1.6px;padding:0 16px;margin-bottom:11px}.nav{display:grid;gap:5px}.nav a{display:flex;gap:13px;align-items:center;padding:13px 16px;border-radius:10px;color:#6a7770;font-size:13px;font-weight:500}.nav a:hover{background:#f5f7f3}.nav a.active{background:#eaf4ee;color:var(--green);font-weight:700}.nav svg{width:19px;height:19px}.nav .nav-number{margin-left:auto;font-size:10px;background:#d9e9df;padding:0 7px;border-radius:5px}.side-progress{margin-top:auto;padding:18px;border:1px solid #e4ece2;border-radius:13px;background:#fbfcf8}.side-progress .plant{color:var(--green);margin-bottom:10px}.side-progress strong{font-size:12px;display:block}.side-progress p{font-size:10px;color:var(--muted);margin:5px 0 14px;line-height:1.8}.progress-bar{height:5px;background:#e6eee4;border-radius:5px;overflow:hidden}.progress-bar span{height:100%;display:block;background:#6e9c70}.progress-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;margin-top:8px}.sidebar-bottom{font-size:9px;color:#a2aaa4;margin:20px 8px 0}.workspace{margin-left:244px}.topbar{height:81px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:20px;padding:0 40px;position:relative}.breadcrumb{font-size:9px;letter-spacing:1.2px;color:#8b958d;white-space:nowrap}.breadcrumb span{margin:0 13px;color:#c7cec7}.breadcrumb strong{letter-spacing:0;font-size:12px;color:#40574d;font-weight:500}.search{margin-left:auto;display:flex;align-items:center;gap:10px;background:#f7f8f5;border:1px solid #e9ede6;border-radius:9px;padding:9px 13px;width:282px}.search svg{width:16px;height:16px;color:#8f9b92}.search input{border:0;background:none;min-width:0;width:100%;outline:0;font-size:11px;color:var(--ink)}kbd{font:11px system-ui;color:#a6afa6;border:1px solid #e0e6dd;border-radius:3px;padding:0 5px}.grade{border:1px solid #dfebe1;color:var(--green);font-size:10px;font-weight:700;letter-spacing:1px;padding:6px 10px;border-radius:7px;white-space:nowrap}.mobile-menu{display:none}.icon-button{display:grid;place-items:center;border-radius:8px;width:34px;height:34px}.icon-button:hover{background:#eef2eb}main{max-width:1480px;margin:auto;padding:32px 40px 40px;min-height:calc(100vh - 150px)}.page-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:22px;gap:20px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:var(--green);margin-bottom:9px}.page-top h1{font-size:28px;letter-spacing:-1.1px}.page-top p{color:var(--muted);font-size:12px;margin:7px 0 0}.date-pill{font-size:11px;color:#7d8c81;display:flex;align-items:center;gap:7px;padding-top:10px;white-space:nowrap}.date-pill svg{width:15px;height:15px}.hero{background:#eaf3e8;border:1px solid #e2ecde;border-radius:20px;position:relative;min-height:316px;overflow:hidden;display:grid;grid-template-columns:1.05fr 1fr;align-items:center}.hero-copy{padding:33px 0 35px 34px;position:relative;z-index:1}.hero-tag{display:inline-flex;gap:6px;align-items:center;border:1px solid #d1e2cd;color:#618163;border-radius:30px;padding:3px 10px;font-size:9px;font-weight:600;letter-spacing:1.2px;margin-bottom:14px;background:#f8fbef77}.hero-tag span{width:5px;height:5px;border-radius:50%;background:#729775}.hero h2{font-size:39px;line-height:1.23;letter-spacing:-1.6px;font-weight:800}.hero h2 em{font-style:normal;color:var(--green)}.hero-copy p{font-size:12px;line-height:1.9;color:#6d8170;max-width:350px;margin:16px 0 22px}.button{border-radius:8px;padding:11px 17px;font-size:12px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:9px;transition:background .15s,transform .15s;border:1px solid transparent;line-height:1.5}.button svg{width:16px;height:16px}.button:hover{transform:translateY(-1px)}.button.primary{background:var(--green);color:#fff}.button.primary:hover{background:#10574a}.button.secondary{background:#fff;border-color:#dfe7dc;color:#4e6558}.button.orange{background:#f4a16e;color:#472c21}.hero-actions{display:flex;gap:10px}.hero-art{height:100%;width:100%;align-self:end;position:relative}.hero-art>svg{width:100%;height:100%;min-height:310px}.hero-note{position:absolute;bottom:26px;right:24px;background:#ffffffd9;backdrop-filter:blur(6px);border:1px solid #fff;border-radius:10px;padding:10px 14px;font-size:10px;color:#6e796e;display:flex;gap:9px;align-items:center;box-shadow:0 6px 20px #1c413c08}.hero-note svg{width:21px;height:21px;color:var(--green)}.hero-note strong{display:block;font-size:11px;color:#3f5a4b}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:20px 0 33px}.stat{border:1px solid var(--line);border-radius:12px;background:white;display:flex;align-items:center;padding:17px 19px;gap:14px}.stat-icon{width:39px;height:39px;border-radius:11px;display:grid;place-items:center;background:var(--tint);color:var(--color);flex-shrink:0}.stat-icon svg{width:20px;height:20px}.stat strong{font-size:23px;letter-spacing:-.8px;line-height:1.2;display:block}.stat span{font-size:10px;color:var(--muted)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:17px}.section-head h2{font-size:22px}.section-head p{font-size:11px;color:var(--muted);margin:4px 0 0}.text-button{font-size:11px;color:var(--green);padding:4px 0;display:inline-flex;align-items:center;gap:7px}.text-button svg{width:14px;height:14px}.filters{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:21px}.filter{font-size:10px;border:1px solid #e1e6dd;padding:7px 13px;border-radius:7px;background:white;color:#788278;font-weight:500}.filter.active{background:#233e36;border-color:#233e36;color:white}.results{font-size:10px;color:#929c93;margin-left:auto}.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.lesson-card{background:white;border:1px solid var(--line);border-radius:13px;overflow:hidden;display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s}.lesson-card:hover{transform:translateY(-4px);box-shadow:0 10px 24px #2548370b;border-color:#bfd4c5}.card-art{height:107px;background:var(--tint);position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden}.card-art>svg{height:120px;width:200px;opacity:.95}.card-number{position:absolute;top:12px;left:13px;font-size:9px;letter-spacing:1px;font-weight:700;background:#ffffffb3;border:1px solid #ffffff7a;border-radius:5px;padding:3px 7px;color:var(--color);z-index:1}.card-done{position:absolute;right:12px;top:12px;background:var(--green);color:white;padding:4px;border-radius:20px}.card-done svg{width:12px;height:12px}.card-body{padding:16px 18px 12px;flex:1}.card-chapter{color:var(--color);font-size:8px;font-weight:700;letter-spacing:1.3px;text-transform:uppercase;margin-bottom:6px}.card-body h3{font-size:14px;line-height:1.65;letter-spacing:-.3px;min-height:46px}.card-body p{font-size:10px;line-height:1.8;color:#879186;margin:8px 0 0}.card-bottom{padding:11px 18px 14px;display:flex;align-items:center;justify-content:space-between}.card-bottom>span{font-size:9px;color:#96a08f;display:flex;gap:5px;align-items:center}.card-bottom svg{height:13px;width:13px}.card-bottom strong{font-weight:600;font-size:10px;display:flex;gap:5px;align-items:center;color:var(--green)}.study-tip{margin-top:28px;display:flex;align-items:center;gap:16px;border-radius:12px;padding:18px 23px;background:#fff5df;border:1px solid #f3e7c5}.study-tip>svg{width:25px;height:25px;color:#bd8e2e;flex-shrink:0}.study-tip strong{font-size:12px}.study-tip p{font-size:10px;color:#98845f;margin:3px 0 0}.study-tip .text-button{margin-left:auto;color:#9c7b35;white-space:nowrap}.footer{max-width:1480px;margin:auto;padding:21px 40px;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);font-size:9px;color:#9aa297}.footer i{font-style:normal;margin:0 8px}.footer button{font-size:9px;color:#8c988d}.empty{grid-column:1/-1;padding:50px;text-align:center;background:white;border:1px dashed #c9d5c6;border-radius:12px}.empty h3{margin-bottom:8px}.empty p{color:var(--muted)}.back{display:inline-flex;align-items:center;gap:7px;color:#7e8c7f;font-size:11px;margin-bottom:17px}.back svg{height:14px;width:14px}.lesson-hero{background:var(--tint);border:1px solid #dfebe1;border-radius:16px;padding:26px 30px;position:relative}.lesson-hero h1{font-size:27px;max-width:780px}.lesson-hero p{max-width:730px;color:#617668;font-size:12px;margin:12px 0 0}.lesson-hero .eyebrow{color:var(--color)}.lesson-top-line{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:10px}.complete-button{background:#ffffffb0;border:1px solid #d2dfd2;white-space:nowrap;font-size:10px;padding:7px 11px;border-radius:7px;display:flex;align-items:center;gap:6px}.complete-button.done{background:var(--green);border-color:var(--green);color:white}.complete-button svg{height:14px;width:14px}.source-meta{display:flex;align-items:center;gap:14px;margin-top:18px;font-size:10px;color:#7d8c7b}.source-meta span{display:flex;gap:5px;align-items:center}.source-meta svg{height:13px;width:13px}.lesson-tabs{display:flex;gap:3px;border-bottom:1px solid #dce5d8;margin:24px 0;overflow:auto;scrollbar-width:thin}.lesson-tabs a{padding:11px 13px 13px;font-size:11px;white-space:nowrap;border-bottom:3px solid transparent;display:flex;align-items:center;gap:7px;color:#7d8a7d}.lesson-tabs a.active{color:var(--green);font-weight:700;border-color:var(--green)}.lesson-tabs svg{height:15px;width:15px}.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:23px}.panel{border:1px solid var(--line);background:white;border-radius:13px;padding:23px;margin-bottom:18px}.panel h2{font-size:19px;margin-bottom:15px}.panel h3{font-size:15px;margin-bottom:11px}.panel ul{margin:0;padding-left:20px}.panel li{padding:3px 0;font-size:12px;line-height:1.9;color:#536c5c}.goals{background:#f0f6eb;border-color:#e4ecda}.goals h2{color:#4e7747}.section-title{display:flex;gap:11px;align-items:center}.section-index{background:#edf4ed;border-radius:7px;display:grid;place-items:center;width:27px;height:27px;font-size:11px;color:var(--green);flex-shrink:0}.key-panel{background:#fff7e2;border-color:#f0e3bc}.key-panel h3{color:#957323}.key-panel li{color:#817049;font-size:11px}.key-panel h3{display:flex;align-items:center;gap:8px}.key-panel svg{width:18px;height:18px}.study-aside{align-self:start;position:sticky;top:20px}.study-aside .panel{padding:19px}.quick-links a{font-size:10px;display:block;border-bottom:1px solid #ecf0e8;padding:9px 0;color:#71836f}.source-box{font-size:10px;color:#94a08e;line-height:1.9;padding:4px 7px}.misconception{padding:17px 0;border-bottom:1px solid #ecede7}.misconception:last-child{border:0;padding-bottom:0}.wrong,.correct{font-size:12px;display:flex;gap:9px;align-items:flex-start}.wrong{color:#a36958;margin-bottom:7px}.correct{color:#36745c}.wrong b,.correct b{font-size:9px;border-radius:4px;padding:1px 6px;white-space:nowrap;flex-shrink:0;line-height:1.8}.wrong b{background:#fff0e9;color:#b97965}.correct b{background:#eaf5e9;color:#4b825f}.misconception p{font-size:10px;color:#879381;margin:7px 0 0 44px}.know{background:#eef6fb;border-color:#dfeaf3}.know .eyebrow{color:#4a83a2;font-size:9px}.know p{font-size:12px;line-height:1.9;color:#5e7a8c}.view-intro{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.view-intro h2{font-size:21px}.view-intro p{color:var(--muted);font-size:11px;margin:5px 0 0}.mindmap{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:35px 25px;min-height:460px;overflow:hidden;background-image:radial-gradient(#d4e0d0 .8px,transparent .8px);background-size:18px 18px}.mind-root{position:relative;z-index:1;max-width:420px;margin:0 auto 55px;background:#1f6656;color:white;border:7px solid #edf4e9;border-radius:20px;text-align:center;padding:19px 27px;box-shadow:0 6px 15px #215b4a16}.mind-root small{font-size:9px;letter-spacing:2px;color:#c7e0cb}.mind-root h3{font-size:18px;margin-top:4px}.branches{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;position:relative}.branches:before{content:'';position:absolute;top:-29px;left:12.5%;right:12.5%;height:1px;background:#bacfb8}.mind-root:after{content:'';position:absolute;top:100%;left:50%;height:33px;width:1px;background:#bacfb8}.branch{background:var(--tint);border:1px solid #d6e1ce;border-radius:12px;position:relative;padding:17px 16px;min-height:185px}.branch:before{content:'';position:absolute;bottom:100%;left:50%;height:29px;width:1px;background:#bacfb8}.branch h4{font-size:12px;color:var(--color);padding-bottom:9px;border-bottom:1px solid #ffffff;display:flex;gap:6px;align-items:center}.branch h4 span{font-size:9px;background:#fff9;border-radius:4px;padding:1px 5px}.branch ul{padding-left:15px;margin:11px 0 0}.branch li{font-size:10px;line-height:1.9;padding:3px 0;color:#5e7466}.map-hint{margin-top:18px;font-size:10px;color:#899684;display:flex;gap:8px;align-items:center}.map-hint svg{height:16px;width:16px}.quiz-toolbar{display:flex;align-items:center;justify-content:space-between;background:#f0f5e9;border:1px solid #e0ead5;border-radius:10px;padding:12px 18px;margin-bottom:20px;font-size:11px;color:#76856b}.quiz-toolbar strong{color:var(--green)}.question{background:white;border:1px solid var(--line);border-radius:12px;padding:23px;margin-bottom:15px}.question-meta{font-size:9px;letter-spacing:1px;font-weight:600;color:#8c9c80;display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.question-meta span{background:#f2f6ec;padding:2px 7px;border-radius:4px;font-size:8px;letter-spacing:0}.question h3{font-size:14px;line-height:1.8;margin-bottom:15px}.options{display:grid;grid-template-columns:1fr 1fr;gap:9px}.option{display:flex;align-items:flex-start;gap:9px;border:1px solid #e3e9de;border-radius:8px;padding:11px 12px;font-size:11px;color:#697d65;cursor:pointer;line-height:1.8}.option:hover{background:#f7f9f2}.option:has(input:checked){border-color:#4f9875;background:#f0f7ed;color:#27664d}.option input{margin:4px 1px 0 0;accent-color:var(--green);flex-shrink:0}.option.correct-answer{background:#eaf5e7;border-color:#75a56b}.option.wrong-answer{background:#fff0e8;border-color:#e6aa8f}.explanation{border-top:1px solid #e6ebdf;margin-top:15px;padding-top:12px;color:#617c5a;font-size:11px}.score{background:#eaf5e8;border:1px solid #cfdfc4;border-radius:13px;padding:25px;display:flex;align-items:center;gap:23px;margin-bottom:20px}.score-number{font-size:34px;font-weight:800;color:var(--green);white-space:nowrap}.score h3{font-size:16px}.score p{font-size:11px;color:#708368;margin:4px 0 0}.score .button{margin-left:auto}.quiz-actions{display:flex;align-items:center;gap:16px;margin-top:22px}.quiz-note{font-size:10px;color:#8f9d83}.quiz-error{color:#b56a45;font-size:11px;margin-top:10px;min-height:20px}.worksheet{border:1px solid #dfe6d8;border-radius:13px;background:white;padding:30px;max-width:950px;margin:auto}.worksheet-title{border-bottom:2px solid #49795d;padding-bottom:20px;margin-bottom:20px}.worksheet-title .eyebrow{font-size:9px}.worksheet-title h2{font-size:23px}.worksheet-title p{font-size:12px;margin:7px 0 0;color:#788d72}.worksheet-identity{display:grid;grid-template-columns:2fr 1fr 1.4fr;gap:18px;margin-bottom:23px}.worksheet-identity label{font-size:10px;color:#8b9786}.worksheet-identity input{width:100%;border:0;border-bottom:1px solid #d4decc;border-radius:0;font-size:12px;padding:5px 0;color:var(--ink);background:none}.worksheet-note{font-size:11px;background:#f2f6ec;color:#7e8e74;border-radius:7px;padding:11px 14px;margin-bottom:22px}.task{margin:22px 0}.task h3{font-size:13px;line-height:1.9;margin-bottom:7px}.task .hint{font-size:10px;color:#9aa38f;line-height:1.8;margin-bottom:8px}.task textarea{display:block;resize:vertical;width:100%;min-height:105px;border:1px solid #e3e9dd;border-radius:8px;padding:12px;font-size:12px;line-height:1.8;background:repeating-linear-gradient(white,white 25px,#f2f4ed 26px);color:#4c6752}.model-answer{margin-top:10px;background:#ecf4e7;padding:12px 15px;border-radius:7px;font-size:11px;color:#5e7c54;white-space:pre-line}.worksheet-end{font-size:10px;color:#92a086;border-top:1px solid #e4eadd;padding-top:18px;margin-top:26px}.worksheet-footer{display:flex;align-items:center;justify-content:space-between;margin-top:20px;font-size:10px;color:#899c7c}.worksheet-buttons{display:flex;gap:8px;flex-wrap:wrap}.worksheet-select{display:flex;gap:9px;margin-bottom:20px;flex-wrap:wrap}.worksheet-select a{padding:9px 15px;background:white;border:1px solid #dfe7d7;border-radius:7px;font-size:11px;color:#89967d}.worksheet-select a.active{background:#eaf3e4;color:var(--green);border-color:#bdd0b4;font-weight:600}.notes-saved{display:flex;gap:6px;align-items:center}.notes-saved svg{width:14px;height:14px}.browse-intro{padding:25px 29px;background:#eaf4ed;border:1px solid #deeadb;border-radius:14px;margin-bottom:25px;display:flex;align-items:center;gap:23px}.browse-intro>svg{height:40px;width:40px;color:#468269;flex-shrink:0}.browse-intro h2{font-size:18px}.browse-intro p{font-size:11px;color:#7d9077;margin:5px 0 0}.lesson-picker{padding:11px 15px;background:white;border:1px solid #dce6d5;border-radius:8px;min-width:250px;color:#647b5d;font-size:11px;max-width:100%}.no-print{}.print-only{display:none}dialog{max-width:590px;width:calc(100vw - 34px);padding:35px;border:1px solid #dce8d6;border-radius:17px;color:var(--ink);box-shadow:0 24px 100px #1c332334}dialog::backdrop{background:#15392c60;backdrop-filter:blur(4px)}dialog h2{font-size:24px;margin-bottom:17px}dialog p{font-size:12px;line-height:1.9;color:#74856d}dialog .subtle{font-size:10px;padding-top:10px;border-top:1px solid #e5ebdf}.close-dialog{position:absolute;right:14px;top:14px}.close-source{margin-top:10px}#toast{position:fixed;bottom:24px;left:calc(50% + 122px);transform:translateX(-50%) translateY(20px);padding:11px 20px;background:#243f32;color:white;font-size:12px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s;z-index:80;max-width:90vw;text-align:center}#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(min-width:1550px){.hero{min-height:345px}.hero h2{font-size:47px}.card-art{height:130px}.card-art>svg{height:145px;width:240px}.card-body h3{font-size:16px}}
@media(max-width:1200px){.sidebar{width:210px;padding:28px 16px}.workspace{margin-left:210px}.topbar{padding:0 27px;gap:14px}.breadcrumb{font-size:8px}.breadcrumb span{margin:0 8px}.search{width:240px}main{padding:27px}.hero h2{font-size:34px}.hero-copy{padding-left:26px}.hero-copy p{font-size:11px}.hero-note{right:17px;bottom:22px}.stats{gap:10px}.stat{padding:14px;gap:10px}.stat strong{font-size:21px}.stat-icon{width:33px;height:33px}.content-layout{grid-template-columns:minmax(0,1fr) 205px;gap:17px}.branches{gap:12px}.branch{padding:13px 11px}.footer{padding:20px 27px}#toast{left:calc(50% + 105px)}}
@media(max-width:1000px){.sidebar{width:186px;padding:27px 12px}.brand{gap:9px}.brand strong{font-size:20px}.brand small{font-size:8px;letter-spacing:1px}.brand-mark{width:36px;height:36px}.workspace{margin-left:186px}.nav a{padding:12px;font-size:12px;gap:10px}.side-progress{padding:14px}.topbar{padding:0 22px}.breadcrumb{display:none}.search{width:100%;max-width:340px;margin-left:0}.grade{margin-left:auto}main{padding:24px 22px}.hero h2{font-size:31px}.hero-copy p{max-width:270px}.hero-actions{gap:7px}.hero-actions .button{font-size:10px;padding:10px 11px}.hero-note{font-size:8px;padding:9px}.hero-note strong{font-size:9px}.hero-copy{padding-top:27px}.stats{grid-template-columns:repeat(4,1fr)}.stat{display:block;padding:13px}.stat-icon{margin-bottom:10px}.stat strong{display:inline-block;font-size:22px;margin-right:3px}.stat span{font-size:8px}.card-body{padding:14px}.card-bottom{padding:10px 14px 14px}.card-body h3{font-size:12px;min-height:40px}.card-art{height:95px}.card-art>svg{height:105px;width:180px}.content-layout{display:block}.study-aside{position:static;display:grid;grid-template-columns:1fr 1fr;gap:15px}.source-box{grid-column:1/-1}.quick-links{display:none}.branches{grid-template-columns:repeat(2,1fr);gap:20px}.branches:before,.branch:before,.mind-root:after{display:none}.mind-root{margin-bottom:25px}.branch{min-height:150px}.lesson-hero h1{font-size:24px}.options{grid-template-columns:1fr}.worksheet{padding:24px}.worksheet-title h2{font-size:20px}#toast{left:calc(50% + 93px)}}
@media(max-width:760px){.sidebar{transform:translateX(-100%);width:245px;transition:transform .2s;box-shadow:15px 0 60px #25483515}.sidebar.open{transform:translateX(0)}.workspace{margin-left:0}.mobile-menu{display:grid;flex-shrink:0}.topbar{height:68px;padding:0 18px;gap:12px;position:sticky;top:0;z-index:20}.search{max-width:none;padding:8px 10px}.search kbd{display:none}.search input{font-size:11px}.grade{font-size:9px;padding:5px 8px}.page-top{margin-bottom:18px}.page-top h1{font-size:25px}.date-pill{font-size:9px;padding-top:6px}main{padding:23px 19px}.hero{grid-template-columns:1.1fr .9fr;min-height:300px}.hero h2{font-size:31px}.hero-copy{padding:25px 0 27px 24px}.hero-copy p{font-size:11px;max-width:270px}.hero-art{height:290px;align-self:center;width:110%;margin-left:-8%}.hero-art>svg{min-height:290px}.hero-note{display:none}.hero-actions .button.secondary{display:none}.stats{margin-bottom:27px}.stat span{display:block;font-size:9px}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card-art{height:105px}.card-body h3{font-size:14px;min-height:46px}.card-body p{font-size:10px}.card-body{padding:16px}.card-bottom{padding:11px 16px 15px}.section-head h2{font-size:20px}.filters{gap:7px}.filter{font-size:9px;padding:6px 10px}.results{font-size:9px}.study-tip .text-button{display:none}.footer{padding:19px;font-size:8px}.footer button{font-size:8px}.lesson-hero{padding:22px}.lesson-top-line{align-items:flex-start}.lesson-top-line .eyebrow{font-size:9px;max-width:65%}.complete-button{font-size:9px;padding:6px 8px}.lesson-hero h1{font-size:24px}.lesson-tabs a{font-size:10px;padding:10px 11px}.panel{padding:20px}.view-intro{align-items:flex-start}.view-intro h2{font-size:18px}.view-intro .button{font-size:10px;padding:9px 11px}.worksheet{padding:22px}.worksheet-title h2{font-size:19px}.quiz-actions{gap:12px;flex-wrap:wrap}.score{padding:20px;gap:16px;flex-wrap:wrap}.score-number{font-size:30px}.score .button{margin-left:0}.browse-intro{padding:22px}.browse-intro>svg{width:32px;height:32px}#toast{left:50%}}
@media(max-width:460px){main{padding:20px 15px}.page-top .date-pill{display:none}.hero{display:block;min-height:345px}.hero-copy{padding:25px;max-width:80%}.hero h2{font-size:34px}.hero-art{position:absolute;bottom:-45px;right:-65px;width:245px;height:255px;opacity:.65;pointer-events:none}.hero-copy p{max-width:220px;font-size:11px}.hero-actions{position:relative;z-index:2}.hero-tag{font-size:8px}.stats{gap:8px;margin-top:15px}.stat{padding:12px 10px}.stat strong{font-size:20px}.stat span{font-size:8px}.stat-icon{width:28px;height:28px;border-radius:7px}.stat-icon svg{width:16px;height:16px}.lesson-grid{gap:12px}.card-art{height:85px}.card-art>svg{width:155px;height:100px}.card-body{padding:13px 12px}.card-body h3{font-size:12px;line-height:1.7;min-height:42px}.card-body p{font-size:9px}.card-chapter{font-size:7px;letter-spacing:1px}.card-bottom{padding:9px 12px 12px}.card-bottom strong{font-size:9px}.card-bottom>span{font-size:8px}.card-number{font-size:8px;top:9px;left:10px}.section-head .text-button{font-size:9px}.results{margin-left:0;width:100%;margin-top:2px}.study-tip{padding:16px;gap:12px}.study-tip strong{font-size:11px}.study-tip p{font-size:9px}.study-aside{display:block}.branches{gap:12px}.branch{padding:13px 12px}.branch h4{font-size:11px}.branch li{font-size:9px}.mindmap{padding:25px 15px}.mind-root h3{font-size:16px}.question{padding:19px}.question h3{font-size:13px}.quiz-toolbar{padding:11px 13px;font-size:10px}.worksheet{padding:20px 17px}.worksheet-identity{grid-template-columns:1fr 1fr;gap:12px}.worksheet-identity label:first-child{grid-column:1/-1}.worksheet-title h2{font-size:18px}.worksheet-title p{font-size:11px}.worksheet-footer{display:block}.notes-saved{margin-top:13px}.view-intro{display:block}.view-intro>.button,.view-intro>.worksheet-buttons{margin-top:13px}.view-intro p{font-size:10px}.footer{flex-direction:column;gap:6px}.source-meta{font-size:9px;gap:10px}.lesson-hero h1{font-size:21px}.lesson-hero .eyebrow{font-size:8px}.complete-button{font-size:8px}.lesson-picker{min-width:0;width:100%}.topbar{padding:0 13px;gap:9px}.grade{padding:5px 7px;font-size:8px}.panel h2{font-size:18px}.wrong,.correct{font-size:11px}.wrong b,.correct b{font-size:8px}.misconception p{margin-left:0}.options{gap:8px}.option{font-size:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
@media print{@page{size:A4;margin:16mm}body{background:white;font-size:11pt}.sidebar,.topbar,.footer,.back,.lesson-hero,.lesson-tabs,.view-intro,.worksheet-select,.worksheet-footer,.no-print,#toast,dialog{display:none!important}.workspace{margin:0}main{padding:0;max-width:none;min-height:0}.worksheet{border:0;padding:0;max-width:none;box-shadow:none}.worksheet-title h2{font-size:19pt}.worksheet-title p{font-size:11pt}.worksheet-identity label{font-size:9pt}.worksheet-identity input{font-size:10pt}.worksheet-note{background:none;border:1px solid #ccc;font-size:9pt}.task{break-inside:avoid;margin:20px 0}.task h3{font-size:10pt}.task textarea{border:1px solid #aaa;border-radius:0;min-height:95px;height:auto;overflow:visible;font-size:10pt;resize:none;background:none}.task .hint{font-size:8pt}.model-answer{display:none!important}.worksheet-end{font-size:8pt}.print-only{display:block}.mindmap{break-inside:avoid;border:0;padding:0}.map-hint{display:none}.branch li{font-size:9pt}.mind-root{print-color-adjust:exact;-webkit-print-color-adjust:exact}.branch{print-color-adjust:exact;-webkit-print-color-adjust:exact}.print-mind .lesson-hero{display:block!important;margin-bottom:24px}.print-mind .lesson-hero .complete-button{display:none}}