@import url('https://fonts.googleapis.com/css2?family=Readex+Pro:wght@400;500;600;700&family=Noto+Sans+Arabic:wght@400;500;600;700;800&display=swap');
:root{--paper:#f8f7f1;--ink:#233e34;--green:#254d3d;--muted:#6d7970;--line:#dfe4d9;--lime:#d8edaf;--orange:#eaa67b;--lilac:#e4dcf2;--white:#fff;--red:#a63e3e}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Noto Sans Arabic',Tahoma,Arial,sans-serif;font-size:16px;line-height:1.9}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{line-height:1.6}button,input,select,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}a{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid #9c6fba;outline-offset:4px}button{color:inherit}img{max-width:100%;display:block}header{border-bottom:1px solid var(--line);background:rgba(248,247,241,.96)}.header-inner{max-width:1320px;margin:auto;min-height:88px;display:flex;align-items:center;gap:38px;padding:12px 40px}.brand{text-decoration:none;font-size:27px;font-weight:800;display:flex;align-items:center;gap:12px}.brand-icon{display:grid;grid-template-columns:repeat(2,10px);gap:3px;transform:rotate(-8deg)}.brand-icon i{width:10px;height:10px;background:var(--green);border-radius:3px}.brand-icon i:last-child{background:var(--orange)}.brand small{font-size:11px;font-weight:500;color:var(--muted);display:block;line-height:1.1}.nav-link{text-decoration:none;font-size:14px;color:var(--muted)}.nav-link.current{color:var(--ink);font-weight:700}.header-end{margin-right:auto;display:flex;align-items:center;gap:12px;font-size:12px}.round-icon{border:1px solid var(--line);background:transparent;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;font-size:18px}.avatar{background:var(--lime);width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:700}.container{max-width:1240px;margin:auto;padding:0 32px}.hero{display:grid;grid-template-columns:1.2fr 1fr;gap:50px;align-items:center;padding:64px 0 56px}.eyebrow{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:14px}.dot{height:7px;width:7px;background:#729453;display:inline-block;border-radius:50%}.hero h1{font-size:clamp(34px,3.6vw,52px);font-weight:800;letter-spacing:-1.4px;line-height:1.65}.hero h1 span{color:#7c9270}.hero p{max-width:490px;margin:16px 0 24px;color:var(--muted);font-size:16px}.btn{border:0;background:var(--green);color:white;border-radius:12px;padding:12px 24px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:12px;text-decoration:none;font-size:14px;min-height:48px}.btn:hover{background:#32644e;transform:translateY(-1px)}.btn.secondary{background:white;color:var(--ink);border:1px solid var(--line)}.btn.soft{background:var(--lime);color:var(--ink)}.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}.btn.small{padding:8px 16px;min-height:40px;font-size:12px}.button-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.fine{font-size:12px;color:var(--muted)}.hero-note{margin-top:16px!important;font-size:12px!important}.hero-art{position:relative;min-height:330px;display:flex;align-items:center;justify-content:center;background:#e9eddf;border-radius:48% 46% 42% 43%;transform:rotate(-3deg)}.hero-art:before{content:'';position:absolute;width:80%;height:80%;border:1px dashed #b2c39b;border-radius:50%;transform:rotate(15deg)}.hero-art img{width:86%;max-height:330px;object-fit:contain;mix-blend-mode:multiply;transform:rotate(3deg);position:relative}.floating{position:absolute;box-shadow:0 8px 20px #233e3410;background:#fffef8;border:1px solid var(--line);border-radius:12px;padding:7px 16px;font-size:12px;transform:rotate(3deg);z-index:1}.float-top{top:10px;right:-8px}.float-bottom{bottom:7px;left:8px}.star{color:#a76a36}.journey-strip{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:16px;background:#fffefb;margin-bottom:45px}.journey-item{display:flex;align-items:center;gap:14px;padding:20px 26px}.journey-item+.journey-item{border-right:1px solid var(--line)}.step-num{font-family:'Readex Pro',sans-serif;width:35px;height:35px;border-radius:10px;background:#edf2e5;display:grid;place-items:center;font-size:13px}.journey-item h3{font-size:14px}.journey-item p{font-size:11px;color:var(--muted)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 22px}.section-head h2{font-size:25px}.section-head p{font-size:12px;color:var(--muted)}.unit-tag{font-size:12px;border:1px solid var(--line);border-radius:30px;padding:5px 15px;background:transparent}.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.lesson-card{text-decoration:none;border:1px solid var(--line);border-radius:18px;background:#fffefb;overflow:hidden;position:relative;transition:transform .2s,box-shadow .2s}.lesson-card.active:hover{transform:translateY(-5px);box-shadow:0 12px 22px #233e3410}.lesson-visual{height:175px;display:flex;align-items:center;justify-content:center;background:#e9efdf;position:relative}.lesson-visual img{width:90%;height:95%;object-fit:contain;mix-blend-mode:multiply}.lesson-card:not(.active) .lesson-visual{height:78px;justify-content:flex-start;padding:0 24px;background:#f0eee7}.lesson-card:not(.active){background:#f4f3ec;color:#677267}.lesson-card .card-content{padding:21px 23px}.card-meta{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:9px}.badge{font-size:10px;padding:2px 9px;border-radius:20px;background:var(--lime);color:var(--ink);font-weight:600}.badge.muted{background:#e7e8e0;color:#6c756a}.lesson-card h3{font-size:20px;margin-bottom:8px}.lesson-card:not(.active) h3{font-size:15px}.lesson-card p{font-size:12px;color:var(--muted)}.card-bottom{border-top:1px solid var(--line);margin-top:18px;padding-top:13px;display:flex;align-items:center;justify-content:space-between;font-size:12px}.card-arrow{display:grid;place-items:center;background:var(--green);color:white;width:32px;height:32px;border-radius:50%}.coming-icon{font-size:30px;color:#a5ac9c}.home-bottom{display:flex;align-items:center;gap:25px;background:#eeeddf;padding:26px 32px;border-radius:16px;margin:34px 0 55px}.home-bottom h3{font-size:17px}.home-bottom p{font-size:12px;color:var(--muted)}.home-bottom .btn{margin-right:auto;white-space:nowrap}footer{border-top:1px solid var(--line);margin-top:35px}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 32px;max-width:1240px;margin:auto;font-size:11px;color:var(--muted)}.footer-inner a{text-underline-offset:3px}.breadcrumb{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted);padding:26px 0 18px}.breadcrumb a{text-decoration:none}.lesson-top{display:flex;justify-content:space-between;align-items:flex-start;gap:25px;margin-bottom:28px}.lesson-top h1{font-size:35px}.lesson-top p{font-size:13px;color:var(--muted);margin-top:6px}.progress-circle{width:72px;height:72px;border:6px solid #e2e7d9;border-radius:50%;display:grid;place-items:center;position:relative;font-size:15px;font-weight:700;background:#fffefb}.progress-label{font-size:10px;text-align:center;color:var(--muted);margin-top:5px}.tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:30px;overflow-x:auto}.tab{border:0;background:transparent;white-space:nowrap;padding:10px 20px;border-radius:10px;color:var(--muted);font-size:13px;font-weight:600}.tab.active{background:var(--green);color:white}.tab:hover:not(.active){background:#eceee4}.lesson-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:30px;align-items:start}.side{position:sticky;top:20px}.side h3{font-size:12px;color:var(--muted);margin-bottom:12px}.topic-link{display:flex;align-items:center;gap:10px;padding:11px 12px;border-radius:10px;text-decoration:none;font-size:12px;margin-bottom:6px;border:1px solid transparent}.topic-link:hover,.topic-link.active{background:white;border-color:var(--line)}.topic-link span:first-child{background:#e8eddf;border-radius:6px;min-width:25px;height:25px;text-align:center;font-size:10px}.side-note{font-size:11px;color:var(--muted);padding:16px;border-top:1px solid var(--line);margin-top:20px}.panel{border:1px solid var(--line);border-radius:18px;background:#fffefb;padding:30px;margin-bottom:24px}.panel h2{font-size:23px;margin-bottom:8px}.panel h3{font-size:18px;margin-bottom:8px}.panel p{font-size:14px}.intro-banner{background:#e9efdf;border:0;display:flex;gap:22px;align-items:center;padding:25px 30px}.intro-banner p{font-size:13px;color:#596b54}.intro-banner .btn{margin-right:auto;flex-shrink:0}.intro-banner h2{font-size:20px}.pill{display:inline-block;font-size:10px;font-weight:600;border-radius:20px;background:#f0eadf;padding:3px 10px;margin-bottom:10px;color:#7d664e}.topic-panel{scroll-margin-top:20px}.key-points{display:grid;gap:10px;margin-top:18px}.key-point{display:flex;gap:12px;align-items:baseline;background:#f3f5ed;border-radius:10px;padding:12px 15px;font-size:14px}.key-point b:first-child{font-size:12px;color:#769263}.topic-art{width:200px;max-height:190px;object-fit:contain;float:left;margin:0 20px 18px 0;mix-blend-mode:multiply}.remember{border-right:3px solid #d79866;background:#fbf0e5;padding:12px 16px;margin:18px 0;font-size:13px;border-radius:6px}.mini-quiz{border-top:1px dashed var(--line);margin-top:20px;padding-top:18px;clear:both}.mini-quiz h4{font-size:14px;margin-bottom:10px}.mini-options{display:flex;flex-wrap:wrap;gap:8px}.mini-options button{border:1px solid var(--line);background:white;border-radius:9px;padding:8px 15px;font-size:12px}.feedback{padding:12px 16px;border-radius:10px;font-size:13px;margin-top:14px;background:#eaf2dc;color:#34552c}.feedback.bad{background:#fbebe4;color:#88492e}.feedback:empty{display:none}.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:18px 0}.fact{border:1px solid var(--line);border-radius:12px;padding:15px}.fact b{font-size:13px;display:block;margin-bottom:4px}.fact p{font-size:12px;color:var(--muted)}.chain{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin:22px 0}.chain b{padding:8px 12px;background:#e8efdc;border-radius:8px;font-size:12px}.chain span{color:#9ba58c}.timeline{display:grid;gap:0;margin-top:20px}.timeline-row{display:grid;grid-template-columns:65px 1fr;gap:20px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px}.timeline-row strong{color:#96704c;font-family:'Readex Pro',sans-serif;font-size:12px}.timeline-row small{display:block;color:var(--muted)}.table-wrap{overflow-x:auto}.info-table{width:100%;border-collapse:collapse;font-size:13px;margin-top:18px}.info-table th,.info-table td{padding:13px 15px;text-align:right;border-bottom:1px solid var(--line)}.info-table th{background:#f0f3e8;font-weight:600}.flash-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}.flash{border:1px solid var(--line);background:#f5f1fa;border-radius:14px;min-height:165px;padding:20px;text-align:right;display:flex;flex-direction:column;justify-content:center}.flash strong{font-size:18px}.flash span{font-size:12px;color:var(--muted);margin-top:10px}.flash.flipped{background:#eaf1de}.quiz-start{max-width:800px;margin:0 auto}.start-hero{text-align:center;padding:40px 30px}.start-icon{font-size:34px;width:80px;height:80px;display:grid;place-items:center;background:var(--lime);border-radius:25px;margin:0 auto 22px}.start-hero h2{font-size:30px}.start-hero p{color:var(--muted);max-width:500px;margin:14px auto 24px}.start-facts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}.start-facts span{background:#f1f3eb;border-radius:8px;padding:5px 12px;font-size:11px}.quiz-shell{max-width:850px;margin:auto}.quiz-meta{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:14px}.bar{height:6px;border-radius:20px;background:#e3e8d9;overflow:hidden;margin-bottom:28px}.bar i{display:block;height:100%;background:#789955;transition:width .25s}.question{font-size:22px!important;line-height:1.9;margin:12px 0 24px!important}.choices{display:grid;gap:11px}.choice{border:1px solid var(--line);background:white;padding:15px 18px;display:flex;align-items:center;gap:14px;text-align:right;border-radius:12px;font-size:14px;transition:background .15s}.choice .letter{background:#f0f2e9;min-width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-size:12px}.choice:hover:not(:disabled){border-color:#8da873;background:#f7faef}.choice.selected{border-color:var(--green);background:#eef3e5}.choice.correct{border-color:#739751;background:#eaf4df}.choice.wrong{border-color:#c89377;background:#fff0e9}.quiz-actions{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-top:26px}.text-btn{border:0;background:none;text-decoration:underline;text-underline-offset:4px;font-size:12px;color:var(--muted);padding:8px}.result-top{text-align:center;padding:24px 10px}.result-num{font-family:'Readex Pro',sans-serif;font-size:58px;color:var(--green);line-height:1.5}.result-top h2{font-size:26px}.result-top p{color:var(--muted);font-size:13px;margin:10px auto 20px;max-width:520px}.topic-results{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:25px 0}.topic-result{border:1px solid var(--line);padding:14px;border-radius:10px;font-size:12px;display:flex;justify-content:space-between;gap:10px}.topic-result.warn{background:#fff4e6}.answer-review{border-top:1px solid var(--line);padding:17px 0;font-size:13px}.answer-review b{display:block;margin-bottom:5px}.answer-review p{font-size:12px;color:var(--muted)}.answer-review.wrong b{color:#a85c39}.activities-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.activity-card{padding:24px;border:1px solid var(--line);border-radius:16px;background:#fffefb}.activity-card h2{font-size:21px}.activity-card p{font-size:12px;color:var(--muted);margin:8px 0 18px}.order-bank,.order-slots{display:flex;flex-wrap:wrap;gap:8px;min-height:65px;padding:15px;border-radius:10px;background:#f1f3e9;margin-bottom:12px}.order-bank button,.order-slots button{border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:12px;background:white}.order-slots{background:#fcf7ed;border:1px dashed #d7c7a8}.order-slots button{background:#fffef9}.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.match-col{display:flex;flex-direction:column;gap:8px}.match-col button{border:1px solid var(--line);border-radius:10px;padding:10px;background:#fff;font-size:12px;min-height:60px}.match-col button.picked{border-color:var(--green);background:#eaf1dc}.match-col button.matched{background:#eef2e7;opacity:.6;border-style:dashed}.activity-card.wide{grid-column:1/-1}.composition{display:grid;grid-template-columns:1fr 1.2fr;gap:30px;align-items:center}.donut{width:210px;height:210px;border-radius:50%;background:conic-gradient(#7db9c2 0 70%,#a9bf70 70% 85%,#e6a478 85% 95%,#a59ac6 95% 99%,#edd489 99% 100%);position:relative;margin:20px auto;display:grid;place-items:center}.donut:before{content:'';position:absolute;inset:35px;border-radius:50%;background:#fffefb}.donut span{z-index:1;font-size:13px;text-align:center;font-weight:600}.legend{display:grid;gap:8px}.legend button{border:1px solid var(--line);background:white;border-radius:10px;padding:10px 14px;display:flex;justify-content:space-between;align-items:center;font-size:12px;text-align:right}.legend i{width:10px;height:10px;border-radius:3px;display:inline-block;margin-left:8px}.book-intro{margin-bottom:24px}.book-intro p{font-size:13px;color:var(--muted)}.book-group{margin:25px 0 12px;font-size:19px}.book-question{border:1px solid var(--line);border-radius:12px;background:#fffefb;margin-bottom:12px;overflow:hidden}.book-question summary{padding:16px 20px;font-size:14px;font-weight:600;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:16px}.book-question summary:after{content:'+';font-size:22px;font-weight:400;color:var(--muted)}.book-question[open] summary:after{content:'−'}.source-tag{font-size:10px;font-weight:400;color:var(--muted);display:block;margin-bottom:5px}.book-body{padding:0 20px 20px}.book-body textarea{width:100%;min-height:85px;border:1px solid var(--line);border-radius:10px;padding:12px;background:#fcfcf8;resize:vertical;font-size:13px}.model-answer{margin-top:14px;padding:16px;background:#f0f4e7;border-radius:10px;font-size:13px}.model-answer p{font-size:13px}.criteria{font-size:12px;color:var(--muted);margin:12px 0}.self-rate{margin-top:12px;display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:11px}.empty{text-align:center;padding:40px;color:var(--muted)}#toast{position:fixed;bottom:24px;left:24px;max-width:360px;z-index:5;background:var(--green);color:white;padding:12px 22px;border-radius:12px;font-size:13px;box-shadow:0 8px 25px #0002;opacity:0;pointer-events:none;transition:opacity .2s}#toast.show{opacity:1}.source-panel{max-width:800px;margin:40px auto}.source-panel p,.source-panel li{font-size:13px;margin-bottom:14px}.source-panel a{color:#46714c}.skip{position:absolute;top:-80px;right:12px;background:var(--green);color:white;padding:10px;z-index:10}.skip:focus{top:10px}.print-title{display:none}.storage-note{font-size:10px;color:var(--muted);margin-top:10px}.quiz-disclaimer{font-size:11px;color:var(--muted);margin:22px 0}.mobile-topics{display:none}.concept-list{display:flex;flex-wrap:wrap;gap:8px;margin:15px 0}.concept-list span{background:#f0f3e8;border-radius:8px;padding:6px 12px;font-size:12px}@media(max-width:950px){.header-inner{padding:12px 24px;gap:25px}.hero{gap:20px}.hero-art{min-height:270px}.journey-item{padding:18px}.lesson-layout{grid-template-columns:175px minmax(0,1fr);gap:18px}.panel{padding:24px}.lesson-grid{gap:12px}.flash-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:700px){body{font-size:15px}.container{padding:0 20px}.header-inner{min-height:74px;padding:10px 20px;gap:18px}.brand{font-size:23px}.nav-link{font-size:11px}.header-end .fine,.header-end .avatar{display:none}.header-end{gap:5px}.hero{grid-template-columns:1fr;gap:28px;padding:35px 0 32px}.hero h1{font-size:35px}.hero p{font-size:14px}.hero-art{min-height:230px;margin:0 20px}.hero-art img{max-height:245px;width:85%}.hero-note{font-size:10px!important}.journey-strip{grid-template-columns:1fr;margin-bottom:30px}.journey-item{padding:13px 20px}.journey-item+.journey-item{border-right:0;border-top:1px solid var(--line)}.journey-item p{font-size:10px}.section-head h2{font-size:21px}.section-head{align-items:flex-start}.unit-tag{font-size:10px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.lesson-card.active{grid-column:1/-1;display:grid;grid-template-columns:135px 1fr}.lesson-visual{height:100%}.lesson-card .card-content{padding:17px}.lesson-card h3{font-size:20px}.lesson-card:not(.active) h3{font-size:13px}.lesson-card:not(.active) .lesson-visual{height:55px}.card-bottom{margin-top:12px;padding-top:10px;font-size:10px}.home-bottom{padding:22px;display:block;margin-bottom:30px}.home-bottom .btn{margin-top:16px}.footer-inner{padding:20px;flex-direction:column;align-items:flex-start;gap:8px}.lesson-top h1{font-size:27px}.lesson-top p{font-size:11px}.progress-circle{width:60px;height:60px;font-size:12px}.tabs{gap:2px;margin-bottom:20px}.tab{padding:9px 13px;font-size:12px}.lesson-layout{display:block}.side{position:static;display:none}.panel{padding:21px;border-radius:14px}.panel h2{font-size:21px}.panel p{font-size:13px}.intro-banner{display:block}.intro-banner .btn{margin-top:15px}.topic-art{width:140px;margin-left:10px}.key-point{font-size:12px;padding:12px}.facts{grid-template-columns:1fr}.flash-grid{grid-template-columns:repeat(2,1fr);gap:9px}.flash{min-height:145px;padding:15px}.flash strong{font-size:15px}.activities-grid{grid-template-columns:1fr}.activity-card.wide{grid-column:auto}.composition{grid-template-columns:1fr;gap:10px}.question{font-size:18px!important}.choice{font-size:13px;padding:12px}.quiz-actions .btn{padding:10px 17px;font-size:12px}.topic-results{grid-template-columns:1fr}.book-question summary{font-size:12px;padding:14px 16px}.book-body{padding:0 16px 16px}.source-panel{margin:25px 20px}.quiz-meta{font-size:10px}.start-hero{padding:28px 20px}.start-hero h2{font-size:24px}.info-table{font-size:11px}.info-table th,.info-table td{padding:10px}.section-head p{font-size:10px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{header,footer,.tabs,.side,.button-row,.mini-quiz,.intro-banner,button{display:none!important}.container{max-width:none}.lesson-layout{display:block}.panel{break-inside:avoid;border-color:#bbb;box-shadow:none}.topic-art{width:120px}body{background:white}.print-title{display:block}}
.tab{text-decoration:none}.btn:disabled{opacity:.45;transform:none}.choice:disabled{cursor:default}.model-answer[hidden]{display:none}
/* Image-led memory cards */
.memory-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:0 0 25px}.memory-heading h2{font-size:29px;margin-bottom:8px}.memory-heading p{font-size:13px;color:var(--muted);max-width:620px}.memory-heading .btn{flex-shrink:0}.memory-controls{margin-bottom:22px}.memory-filters{display:flex;gap:8px;flex-wrap:wrap}.memory-filters button{border:1px solid var(--line);border-radius:25px;padding:8px 16px;min-height:44px;background:#fffefb;font-size:12px}.memory-filters button.active{background:var(--green);color:white;border-color:var(--green)}.memory-filters button span{opacity:.7;margin-right:7px}.memory-counter{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-top:13px;font-size:11px;color:var(--muted)}.memory-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;align-items:stretch}.memory-card{min-width:0;perspective:1400px}.memory-card-inner{display:grid;height:100%;min-height:465px;transform-style:preserve-3d;transition:transform .65s cubic-bezier(.22,.7,.2,1)}.memory-card.is-flipped .memory-card-inner{transform:rotateY(180deg)}.memory-face{grid-area:1/1;min-width:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border:1px solid var(--line);border-radius:20px;background:#fffefb;overflow:hidden;box-shadow:0 5px 15px #233e3405}.memory-front{transform:rotateY(0deg)}.memory-flip{display:flex;flex-direction:column;align-items:stretch;text-align:right;border:0;background:transparent;width:100%;height:100%;padding:22px;border-radius:20px}.memory-flip:focus-visible{outline-offset:-5px}.memory-card-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:10px;color:var(--muted);min-height:30px}.memory-card-top>span:first-child{background:#edf1e4;padding:3px 10px;border-radius:20px}.memory-picture{display:flex;justify-content:center;align-items:center;background:#f3f3e9;border-radius:14px;height:210px;margin:15px 0 22px;overflow:hidden;padding:15px}.memory-picture img{max-width:100%;width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}.memory-flip>strong{font-size:21px;line-height:1.7;margin-bottom:18px}.memory-instruction{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:auto;padding-top:15px;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}.memory-instruction b{font-size:11px;font-weight:600;color:var(--green)}.memory-back{transform:rotateY(180deg);background:#edf3e4;padding:20px;display:flex;flex-direction:column;align-items:stretch}.memory-return{border:1px solid #ccd9be;border-radius:20px;min-height:38px;padding:4px 10px;background:#fffef9;font-size:10px}.memory-zoom{position:relative;display:flex;justify-content:center;align-items:center;border:1px solid #dce5d1;border-radius:14px;background:#fffefb;height:230px;margin:14px 0 18px;padding:14px 14px 32px;overflow:hidden;cursor:zoom-in}.memory-zoom img{width:100%;height:100%;object-fit:contain}.memory-zoom span{position:absolute;bottom:6px;right:0;left:0;text-align:center;font-size:10px;color:var(--green)}.memory-answer h3{font-size:15px;margin-bottom:8px}.memory-answer p{font-size:13px;line-height:1.95}.memory-cue{border-top:1px solid #d6e1cb;margin-top:auto;padding-top:12px;font-size:10px;color:#58714a}.memory-answer{padding-bottom:16px}.memory-bottom{border:1px solid var(--line);border-radius:16px;background:#eeeddf;padding:25px 30px;margin:28px 0;display:flex;justify-content:space-between;align-items:center;gap:22px}.memory-bottom h3{font-size:18px}.memory-bottom p{font-size:12px;color:var(--muted)}.memory-bottom .btn{flex-shrink:0}.image-viewer{border:1px solid var(--line);padding:0;width:min(940px,calc(100vw - 40px));max-width:none;max-height:calc(100dvh - 40px);border-radius:22px;color:var(--ink);background:var(--paper);box-shadow:0 25px 90px #10271f55;overflow:hidden}.image-viewer::backdrop{background:#152b24bb;backdrop-filter:blur(5px)}.viewer-head{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:20px 25px;border-bottom:1px solid var(--line)}.viewer-head h2{font-size:20px;line-height:1.7}.viewer-close{flex-shrink:0;width:44px;height:44px;border:1px solid var(--line);border-radius:50%;font-size:27px;line-height:1;background:#fff;color:var(--ink)}.viewer-scroll{overflow:auto;max-height:calc(100dvh - 235px);padding:22px 28px;overscroll-behavior:contain}.viewer-scroll img{display:block;max-height:58dvh;width:100%;height:auto;object-fit:contain;margin:auto;background:white;border-radius:14px}.viewer-scroll p{font-size:16px;line-height:2;padding:20px 8px 0;max-width:750px;margin:auto}.viewer-foot{display:flex;justify-content:space-between;align-items:center;gap:15px;border-top:1px solid var(--line);padding:13px 25px}.viewer-foot>span{font-size:10px;color:var(--muted)}body:has(.image-viewer[open]){overflow:hidden}@media(min-width:1450px){.memory-grid{gap:25px}.memory-card-inner{min-height:480px}}@media(max-width:1100px){.memory-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.memory-heading h2{font-size:26px}.memory-picture{height:220px}.memory-zoom{height:245px}}@media(max-width:700px){.memory-heading{align-items:flex-start;flex-direction:column;gap:15px}.memory-heading h2{font-size:24px}.memory-heading p{font-size:12px}.memory-grid{gap:15px}.memory-flip{padding:17px}.memory-flip>strong{font-size:19px}.memory-picture{height:175px}.memory-card-inner{min-height:440px}.memory-back{padding:17px}.memory-answer p{font-size:12px}.memory-zoom{height:200px}.memory-filters{gap:6px}.memory-filters button{padding:7px 13px;font-size:11px}.memory-bottom{padding:23px;align-items:flex-start;flex-direction:column}.image-viewer{width:calc(100vw - 20px);max-height:calc(100dvh - 20px);border-radius:16px}.viewer-head{padding:15px;gap:10px}.viewer-head h2{font-size:17px}.viewer-scroll{padding:15px;max-height:calc(100dvh - 220px)}.viewer-scroll p{font-size:14px}.viewer-foot{padding:12px 15px}.viewer-foot>span{font-size:9px}.viewer-foot .btn{font-size:10px;padding:8px 12px}.viewer-scroll img{max-height:50dvh}.memory-counter{font-size:10px}}@media(max-width:540px){.memory-grid{grid-template-columns:minmax(0,1fr)}.memory-card-inner{min-height:485px}.memory-picture{height:230px}.memory-zoom{height:260px}.memory-flip{padding:20px}.memory-back{padding:20px}.memory-answer p{font-size:14px}.memory-flip>strong{font-size:22px}.memory-instruction,.memory-instruction b{font-size:11px}}@media(max-width:360px){.memory-card-inner{min-height:465px}.memory-picture{height:190px}.memory-zoom{height:220px}.memory-flip>strong{font-size:20px}.memory-answer p{font-size:13px}}@media(max-height:520px) and (orientation:landscape){.image-viewer{width:calc(100vw - 28px);max-height:calc(100dvh - 16px)}.viewer-head{padding:8px 18px}.viewer-head h2{font-size:16px}.viewer-head .source-tag{display:none}.viewer-scroll{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:20px;max-height:calc(100dvh - 135px);padding:12px 20px}.viewer-scroll img{max-height:55dvh}.viewer-scroll p{font-size:13px;padding:0}.viewer-foot{padding:8px 18px}}@media(prefers-reduced-motion:reduce){.memory-card-inner{transition:none}}@media print{.memory-grid{display:block}.memory-card{break-inside:avoid;margin-bottom:20px}.memory-card-inner{display:block;min-height:0;transform:none!important}.memory-front{display:none}.memory-back{transform:none;display:block}.memory-zoom{display:block!important}.memory-zoom img{max-height:180px}.memory-controls,.memory-instruction,.memory-bottom,.image-viewer{display:none!important}}
.viewer-zoom-controls{display:flex;gap:10px;align-items:center;font-size:12px;direction:ltr}.viewer-zoom-controls button{width:42px;height:42px;min-height:42px;border:1px solid var(--line);background:#fffefb;border-radius:10px;font-size:22px;line-height:1}.viewer-zoom-controls button:disabled{opacity:.35;cursor:default}.viewer-scroll.image-is-zoomed{display:block}.viewer-scroll.image-is-zoomed img{max-height:none;max-width:none;margin:0}.viewer-scroll.image-is-zoomed p{padding-top:20px}.viewer-foot .btn{min-height:42px}@media(max-width:360px){.viewer-zoom-controls{gap:6px;font-size:10px}.viewer-zoom-controls button{width:38px;height:42px}.viewer-foot{gap:8px}}
.cell-compare-images{display:grid;grid-template-columns:1fr 1fr;gap:15px;background:#f2f4eb;border-radius:14px;padding:15px;margin-bottom:20px}.cell-compare-images img{width:100%;height:150px;object-fit:contain;mix-blend-mode:multiply}.sort-part{text-align:center;padding:15px;background:#f3f1e7;border-radius:10px;margin:12px 0!important}.activity-card [hidden]{display:none!important}.activity-card #sort-next{margin-top:14px}.osmosis-options{display:flex;gap:10px;flex-wrap:wrap}.water-model{display:grid;grid-template-columns:1fr 1.2fr;gap:25px;align-items:center;margin:22px 0}.water-model img{width:100%;height:250px;object-fit:contain;mix-blend-mode:multiply}.water-model h3{font-size:22px}.water-model p{font-size:14px}.process-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin:20px 0}.process-grid>div{background:#f3f5ed;border-radius:14px;padding:20px}.process-grid img{width:100%;height:180px;object-fit:contain;mix-blend-mode:multiply;margin-bottom:15px}.process-grid label{display:block;font-size:12px;margin:15px 0 5px}.process-grid select{width:100%;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fffefb;min-height:44px;font-size:13px;color:var(--ink)}.process-grid select[aria-invalid=true]{border-color:#b16a47;background:#fff0e6}@media(max-width:700px){.water-model{grid-template-columns:1fr;gap:10px}.water-model img{height:190px}.process-grid{grid-template-columns:1fr}.cell-compare-images img{height:120px}.lesson-top h1{overflow-wrap:break-word}.lesson-top>div:first-child{min-width:0}}
.lesson-video{display:block;width:min(100%,780px);max-height:65dvh;margin:20px auto;border:1px solid var(--line);border-radius:15px;background:#101e18;object-fit:contain;aspect-ratio:16/9}
.comparison-heading{margin-bottom:25px}.comparison-heading h2{font-size:26px}.comparison-heading p{font-size:13px;color:var(--muted);margin:10px 0 18px}.comparison-shortcuts{display:flex;gap:8px;flex-wrap:wrap}.comparison-shortcuts button{border:1px solid var(--line);background:white;border-radius:20px;font-size:12px;padding:9px 16px;min-height:44px}.comparison-panel{scroll-margin-top:20px;padding:24px}.comparison-wrap{overflow-x:auto;max-width:100%;overscroll-behavior-inline:contain;border-radius:12px;border:1px solid var(--line);background:#fffefb;touch-action:pan-x pan-y}.comparison-table{width:100%;border-collapse:separate;border-spacing:0;table-layout:auto;font-size:13px;line-height:1.9}.comparison-table caption{text-align:right;padding:15px 17px;background:#eaf0df;font-size:17px;font-weight:700;color:var(--green);caption-side:top}.comparison-table caption span{display:inline-block;font-size:10px;font-weight:400;color:var(--muted);margin-right:12px}.comparison-table th,.comparison-table td{text-align:right;vertical-align:top;padding:13px 16px;min-width:115px;border-bottom:1px solid var(--line);border-left:1px solid var(--line)}.comparison-table thead th{background:#f0f4e8;font-weight:700}.comparison-table tbody th{background:#f8f8f1;font-weight:600}.comparison-table tr:last-child>*{border-bottom:0}.comparison-table tr>:last-child{border-left:0}.comparison-table tbody tr:nth-child(even) td{background:#fbfcf7}.comparison-compact .comparison-table{font-size:11px;line-height:1.8}.comparison-compact .comparison-table caption{font-size:12px;padding:10px}.comparison-compact .comparison-table th,.comparison-compact .comparison-table td{padding:8px;min-width:82px}.memory-card.has-comparison .memory-zoom{height:140px}.memory-card.has-comparison .memory-answer h3{margin-bottom:12px}.viewer-scroll #viewer-answer{padding-top:18px}.viewer-scroll #viewer-answer>p{padding-top:0}.viewer-scroll .comparison-wrap{margin-top:3px}@media(max-width:700px){.comparison-panel{padding:14px}.comparison-table{font-size:12px}.comparison-table th,.comparison-table td{padding:11px;min-width:100px}.comparison-table caption{font-size:15px}.comparison-shortcuts button{font-size:11px}.comparison-compact .comparison-table th,.comparison-compact .comparison-table td{min-width:85px}.memory-heading .button-row{gap:8px}}@media print{.comparison-wrap{overflow:visible}.comparison-table{font-size:10px}.comparison-shortcuts{display:none}}
@media(max-width:540px){.comparison-table{table-layout:fixed}.comparison-table th,.comparison-table td{min-width:0;padding:10px 7px;overflow-wrap:anywhere}.comparison-table:has(thead tr>:nth-child(4)){min-width:380px}.comparison-compact .comparison-table th,.comparison-compact .comparison-table td{min-width:0;padding:8px 6px}}

/* Clear learning points and in-place review cards. */
.comparison-table th,.comparison-table td,.info-table th,.info-table td{text-align:center;vertical-align:middle}.comparison-table caption{text-align:center}.learning-list{list-style:none;padding:0;margin:12px 0;display:grid;gap:14px}.learning-list li{display:flex;align-items:baseline;gap:10px;line-height:2}.learning-number{font-weight:800;color:var(--green);flex-shrink:0}.memory-answer .learning-list{font-size:14px}.review-card-dialog{width:min(720px,calc(100vw - 24px))}.review-card-dialog .viewer-scroll{max-height:calc(100dvh - 220px)}.review-card-dialog .review-card-image{height:180px;width:100%;object-fit:contain}.review-card-dialog .viewer-scroll p{padding:14px 0 0}.review-card-dialog .viewer-head h2{font-size:19px}.review-card-dialog .viewer-foot{justify-content:flex-end}@media(max-width:540px){.review-card-dialog .viewer-head h2{font-size:16px}.review-card-dialog .review-card-image{height:140px}.review-card-dialog .viewer-scroll{padding:16px}.learning-list{gap:12px}}

.brand .school-name{font-size:12px;line-height:1.8;margin-top:7px;color:var(--ink);font-weight:500}@media(max-width:540px){.header-inner{flex-wrap:wrap;gap:10px 18px}.brand{flex-basis:100%}.brand .school-name{font-size:11px;margin-top:5px}}
/* New lessons share the same readable, responsive activity layout. */
.punnett{max-width:580px;margin:15px auto 20px}.punnett caption{font-size:14px;padding:12px}.punnett select{direction:ltr;width:100%;min-width:68px;padding:10px;border:1px solid var(--line);border-radius:10px;background:white}.punnett select[aria-invalid=true]{border:2px solid var(--red)}.activity-card .order-slots{min-height:80px}.activity-card .button-row{margin-top:14px}.memory-cue{text-align:start}@media(max-width:540px){.punnett th,.punnett td{padding:8px 5px}.punnett select{font-size:13px;padding:8px 4px;min-width:55px}.activity-card .sort-part{font-size:20px}}
.brand .school-name{display:block}.comparison-table th,.comparison-table td{word-break:normal;overflow-wrap:normal}
.lesson-video{display:block;width:100%;max-width:760px;max-height:58dvh;object-fit:contain;background:#e9eee5;border-radius:14px;margin:18px auto}.activity-card .lesson-video+p{margin-bottom:18px}

.home-intro{display:block;min-height:0;padding-block:36px}.home-intro h1{font-size:clamp(2rem,5vw,3.2rem)}.home-intro p{max-width:720px}