/* Nexum-inspired cinematic composition, adapted for a complete Arabic lesson. */
:root{--bg:#101714;--mint:#e9d4a0;--muted:#d3dad4;--line:rgba(239,239,219,.19);--panel:rgba(12,22,17,.76)}
body{background:#101714}.cinema{position:fixed;inset:0;z-index:-1;background:#16241a url('scene-poster.webp') center/cover no-repeat;overflow:hidden;pointer-events:none}.cinema video{height:100%;width:100%;object-fit:cover;display:block}.header{height:95px;margin:0;border:0;padding:18px 4vw;gap:16px;background:linear-gradient(#08120d99,transparent);align-items:center}.brand{margin-left:auto;text-shadow:0 2px 20px #0008}.brand-mark{color:#f4e4bd}.brand-sub{color:#f1f0e1}.chapters{background:#111c16a3;backdrop-filter:blur(24px);border-color:#ffffff20;padding:6px}.chapters a{color:#e5ebe2;padding:9px 17px;font-size:13px}.chapters a[aria-current]{background:#eee9d9;color:#172018}.fullscreen,.motion-button{border:1px solid #ffffff22;background:#122019b3;backdrop-filter:blur(16px);border-radius:50px;padding:10px 15px;color:#f4f3e8;font-size:12px;white-space:nowrap}.motion-button{display:flex;align-items:center;justify-content:center;gap:9px;min-height:44px}.fullscreen span{display:none}.js main{height:auto;min-height:calc(100svh - 180px)}.slide,.js .slide{min-height:calc(100svh - 180px);height:auto;max-width:1800px;grid-template-columns:1.12fr 1fr;grid-template-rows:1fr auto;align-items:end;align-content:end;gap:24px 30px;padding:65px 4vw 26px}.slide-content{background:rgba(9,20,14,.84);border:1px solid #ffffff20;backdrop-filter:blur(24px);border-radius:24px;padding:28px 32px;box-shadow:0 20px 60px #0002}.eyebrow{margin-bottom:14px;color:#e9d4a0;font-size:12px}h1{font-size:clamp(42px,4vw,66px);line-height:1.25;letter-spacing:-1px}h2{font-size:clamp(34px,3.2vw,53px);line-height:1.35;letter-spacing:-1px}.hero-sub{font-size:20px;margin-top:12px;color:#faf3df}.lesson-copy{margin-top:18px;font-size:17px;line-height:1.9;color:#e1e6df}.lesson-copy p+p{margin-top:9px}.memory-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.memory-row span{font-size:12px;padding:3px 12px;border:1px solid #e9d4a02c;border-radius:30px;color:#e9d4a0;background:#e9d4a009}.primary{margin-top:20px;border-radius:50px;padding:11px 21px;font-size:14px;background:#eee9d9;color:#132117;box-shadow:none}.primary:hover{background:#fff8e4}.visual-panel{background:rgba(10,23,16,.79);border:1px solid #ffffff29;backdrop-filter:blur(24px);border-radius:24px;box-shadow:0 20px 60px #0002;padding:26px}.panel-top{color:#e9e4d5}.panel-top .mono{color:#b4c0b0;letter-spacing:1px}.data-card{background:#ffffff07;border-color:#ffffff1e}.data-example{color:#e4e9e0}.data-card small,.panel-bottom{color:#c8d4c5}.insight{margin-top:18px;padding:2px 14px}.insight p{font-size:15px;line-height:1.8}.insight span{font-size:11px}.variables{margin-top:16px;max-width:none}.variables>div{padding:9px 0;font-size:14px}.variables dd{color:#e0e6db}.variables dt span{color:#b6b9a1}.discovery-panel{padding:23px;overflow:hidden}.discovery-art{display:block;object-fit:cover;width:100%;height:clamp(180px,24vh,300px);border-radius:14px;opacity:.95}.discovery-bottom{display:flex;flex-direction:column;gap:6px;margin-top:20px}.discovery-bottom strong{font-size:24px;font-weight:500}.discovery-bottom>span{font-size:13px;color:#cbd7c7}.process-strip{position:static;grid-column:1/-1;border:1px solid #ffffff21;background:#0c1a13b8;backdrop-filter:blur(20px);border-radius:15px;padding:14px 23px;margin:0;gap:28px;color:#f1f0e3}.process-strip b{color:#e9d4a0}.process-strip small{color:#d3dacc}.footer{height:82px;margin:0;padding:0 4vw;border:0;background:linear-gradient(transparent,#07110cb3)}.footer-info{background:#102017c9;backdrop-filter:blur(14px);border:1px solid #ffffff18;border-radius:30px;padding:8px 17px;gap:16px}.footer-info .mono span{color:#c4c9b7}.footer-controls{background:#102017b8;padding:5px;border-radius:35px;backdrop-filter:blur(14px)}.arrow-button{background:#18271aa6;border-color:#ffffff29}.arrow-button.next{background:#eee9d9}.progress-dots{padding:0 10px;border-radius:20px;background:#102017c9}.progress-dots a:after{background:#ffffff44}.bottom-progress{background:#183422}.experiment-readout output{color:#e9d4a0}.experiment-tag{color:#f4e3b8;background:#e9d4a00a;border-color:#e9d4a033}.range-labels,.simulation-label{color:#c8d1bf}.reaction b{color:#d3ddc9}.quiz{padding-top:18px}#answer{margin-top:15px;padding:14px;background:#e9d4a00c;color:#f1dfb6;border:1px solid #e9d4a026;line-height:1.8}.comparison p{color:#d3ddce}.slide.active .slide-content,.slide.active .visual-panel{animation-duration:.8s}.noscript{background:#102017}
@media(min-width:1450px){.slide-content{padding:34px 38px}.lesson-copy{font-size:19px;line-height:1.9}.slide,.js .slide{padding-top:100px;gap:28px 40px}.visual-panel{padding:30px}}
@media(max-width:1100px){.header{gap:10px;padding-right:3vw;padding-left:3vw}.chapters a{padding:8px 10px;font-size:12px}.motion-label{display:none}.motion-button{width:44px;padding:8px}.slide,.js .slide{padding:45px 3vw 24px;gap:20px;grid-template-columns:1fr 1fr}.slide-content{padding:24px}.lesson-copy{font-size:16px;line-height:1.85}h1{font-size:48px}h2{font-size:39px}.visual-panel{padding:22px}.process-strip{gap:20px}.variables>div{font-size:13px}.footer{padding:0 3vw}}
@media(max-width:760px){.header{height:85px;padding:15px 5vw;flex-wrap:nowrap}.chapters{top:91px;left:5vw;right:5vw;background:#0e1d16e0;justify-content:space-between;padding:4px}.chapters a{font-size:11px;padding:7px 8px}.brand{font-size:25px}.fullscreen{padding:10px;min-width:42px}.motion-button{width:42px}.js main{min-height:calc(100svh - 167px)}.slide,.js .slide{grid-template-columns:1fr;grid-template-rows:auto;align-items:start;min-height:calc(100svh - 167px);padding:78px 5vw 20px;gap:18px}.slide-content{padding:24px 22px;border-radius:21px;background:#09170de3}.lesson-copy{font-size:16px;line-height:1.95}.lesson-copy p+p{margin-top:12px}h1{font-size:46px}h2{font-size:38px}.eyebrow{font-size:11px}.visual-panel{background:#0c1b12dd;border-radius:21px}.discovery-art{height:200px}.discovery-bottom strong{font-size:22px}.process-strip{gap:16px;padding:15px 20px;grid-column:auto}.process-strip small{width:100%;margin:0}.footer{padding:0 5vw;height:82px}.footer-info{padding:6px 13px}.footer-label{display:inline;font-size:11px}.footer-info .mono{font-size:14px}.cinema video{object-position:44% center}.insight p{font-size:15px}.variables>div{font-size:13px}.summary-panel{margin-bottom:0}.comparison p{font-size:12px}.quiz h3{font-size:18px}}
@media(max-width:360px){.chapters a{font-size:10px;padding:7px 6px}.slide-content,.visual-panel{padding:19px}h1{font-size:42px}h2{font-size:34px}.lesson-copy{font-size:15px}.footer-info{gap:8px}.footer-label{font-size:10px}}
@media(prefers-reduced-motion:reduce){.cinema video{display:none}}
@media print{.cinema,.motion-button{display:none!important}.slide-content{background:white;border:0;box-shadow:none;backdrop-filter:none}.lesson-copy{font-size:14px;line-height:1.7}.memory-row{display:none}.discovery-art{height:150px}.slide,.js .slide{min-height:0;padding:20px}.visual-panel{background:#f4f6f3;backdrop-filter:none}.process-strip{background:#f4f6f3}}

/* Larger visual explanations and closing review. */
@media(min-width:761px){.slide,.js .slide{grid-template-columns:1fr 1.12fr;gap:28px;padding-top:42px}.discovery-art{height:clamp(300px,38vh,440px)}.beaker{height:245px}.chem{width:66px;height:66px;font-size:22px}.chem.compound{width:76px}.reaction{gap:10px;padding:28px 0}.data-symbol{font-size:72px;height:98px}.data-card{padding:30px 21px}.data-card h3{font-size:25px}.branches article{padding:30px 18px}.branch-icon{width:64px;height:64px;font-size:38px}}
.review-hint{font-size:12px;color:var(--muted);margin:8px 0 15px}.review-question{border-top:1px solid var(--line);padding:12px 0}.review-question summary{cursor:pointer;font-size:15px;line-height:1.8;color:#f3ead5;min-height:30px}.review-question summary:focus-visible{outline:2px solid var(--mint);outline-offset:4px}.review-question p{font-size:14px;line-height:1.9;color:#cce3d0;padding:10px 15px 2px}.review-question[open]{background:#ffffff04;border-radius:8px}.teacher-survey{grid-column:1/-1;background:#0b1b13e8;border:1px solid #ead6a23b;border-radius:22px;padding:28px;text-align:center;backdrop-filter:blur(20px)}.teacher-survey h3{font-size:27px;font-weight:500;margin-top:8px}.survey-options{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:20px}.survey-options button{background:#f2e9d9;color:#18261b;border:2px solid transparent;padding:12px 25px;border-radius:13px;font-size:19px;min-width:145px;transition:transform .2s,box-shadow .2s}.survey-options button+button{background:#20372a;color:#f0eadc;border-color:#aec1a333}.survey-options button:hover{transform:translateY(-3px)}.survey-options button[aria-pressed=true]{border-color:#b1ffd0;box-shadow:0 0 0 3px #b1ffd025}.survey-options button span{font-size:12px;margin-right:8px;opacity:.7}.survey-response{min-height:32px;font-size:16px;color:#caf4d7;margin-top:15px}.teacher-survey small{color:#b6c4b6;font-size:11px}#slide-6{align-items:start}#slide-6 .process-strip{order:2}#slide-6 .teacher-survey{order:3}
@media(max-width:1100px) and (min-width:761px){.chem{width:50px;height:50px;font-size:18px}.chem.compound{width:59px}.reaction{gap:6px}.slide,.js .slide{grid-template-columns:1fr 1fr}.data-card{padding:25px 14px}.beaker{height:205px}}
@media(max-width:760px){.discovery-art{height:290px}.beaker{height:210px}.teacher-survey{padding:24px 18px}.teacher-survey h3{font-size:23px}.review-question summary{font-size:14px}.survey-options{gap:10px}.survey-options button{min-width:115px;padding:12px 16px;font-size:17px}.teacher-survey{grid-column:auto}}
@media print{.review-question>p{display:block!important}.teacher-survey{display:none}.discovery-art{height:180px}.beaker{height:150px}}

#slide-8,#slide-9{display:block}#slide-8:not(.active),#slide-9:not(.active){display:none}.review-heading{background:#0a1b13eb;padding:25px 30px;border-radius:20px;margin-bottom:22px}.review-heading h2{font-size:36px}.review-heading p{color:#d6e0d3;margin-top:10px}#quiz-score{color:#e9d4a0}.mcq-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.mcq-card{min-width:0;margin:0;background:#0b1e15f0;border:1px solid #e9d4a044;border-radius:18px;padding:20px}.mcq-card legend{float:right;width:100%;font-size:17px;line-height:1.8;margin-bottom:15px;font-weight:600}.mcq-card button{display:block;width:100%;margin:9px 0;background:#ffffff09;border:1px solid #ffffff22;border-radius:10px;text-align:right;padding:12px 14px;font-size:14px;line-height:1.7}.mcq-card button:hover:not(:disabled){background:#ffffff19}.mcq-card button:disabled{opacity:1;cursor:default}.mcq-card .correct{background:#26774a55;border-color:#8ce4a5;color:#dbffe5}.mcq-card .incorrect{background:#a82e3655;border-color:#ed8b8b}.mcq-feedback{clear:both;font-size:13px;line-height:1.8;color:#d9e7d1;margin-top:12px}.teacher-stage{min-height:70svh;border-radius:30px;border:1px solid #e9d4a044;background:#091a13ec;text-align:center;display:grid;place-items:center;padding:55px 25px;position:relative;overflow:hidden}.teacher-stage .eyebrow{justify-content:center}.ending-emoji,.result-emoji{display:block;font-size:70px;margin:10px 0 22px}.teacher-stage h2{font-size:clamp(32px,4.8vw,65px);line-height:1.5}.teacher-stage p{font-size:20px;color:#d6e7d6;max-width:630px;margin:18px auto 0;line-height:1.9}.teacher-stage .primary{margin:28px auto 10px}.reset-ending{background:transparent;color:#dbd7c5;border-bottom:1px solid #ffffff44;padding:8px;margin-top:20px;font-size:14px}.ending-result{position:relative;width:100%;outline:none}.celebrate{background:radial-gradient(ellipse at center,#23523c,#081c15 75%)}.spooky{background:radial-gradient(ellipse at center,#5c111a,#12050a 75%);border-color:#f4676766}.spooky h2{color:#ffc0bb;text-shadow:0 4px 35px #fa32328a}.spooky .result-emoji{filter:drop-shadow(0 0 28px #ff3131)}.spooky .primary{background:#ffc4b9;color:#411316}.fireworks{position:absolute;inset:-100px -10px;pointer-events:none;z-index:0}.ending-result> :not(.fireworks){position:relative;z-index:1}.fireworks i{position:absolute;left:var(--x);top:var(--y);height:6px;width:6px;border-radius:50%;background:var(--color);box-shadow:0 0 12px var(--color);animation:burst 2.6s ease-out var(--delay) 3 both}@keyframes burst{0%{transform:translate(0,0) scale(.3);opacity:0}12%{opacity:1}80%,100%{transform:translate(var(--dx),var(--dy)) scale(.3);opacity:0}}@media(max-width:1100px){.mcq-grid{grid-template-columns:repeat(2,1fr)}.chapters a{padding:8px;font-size:11px}}@media(max-width:760px){.mcq-grid{grid-template-columns:1fr}.chapters{overflow-x:auto;justify-content:flex-start;scrollbar-width:thin}.chapters a{flex-shrink:0;padding:8px 10px}.teacher-stage{min-height:65svh;padding:35px 18px}.teacher-stage p{font-size:17px}.review-heading{padding:22px}.review-heading h2{font-size:30px}.ending-emoji,.result-emoji{font-size:58px}.teacher-stage .survey-options button{min-width:115px}}@media(prefers-reduced-motion:reduce){.fireworks i{animation:none;opacity:.65;transform:translate(var(--dx),var(--dy))}}@media print{#slide-7:not(.active){display:block}#slide-8{display:none!important}.mcq-grid{grid-template-columns:repeat(2,1fr)}}

#slide-1.title-cover{display:grid;grid-template-columns:1fr;grid-template-rows:1fr;place-items:center;min-height:calc(100svh - 180px);padding:40px 5vw}.title-cover .cover-title{text-align:center;background:#0b1a12bb;border:1px solid #f4e6c736;border-radius:28px;padding:55px 65px;backdrop-filter:blur(16px);box-shadow:0 25px 70px #0003}.title-cover h1{font-size:clamp(56px,8vw,120px);line-height:1.5;letter-spacing:-1px}.method-context{font-size:15px;line-height:1.95;color:#e7e7d8;margin-bottom:25px;padding-bottom:20px;border-bottom:1px solid var(--line)}@media(max-width:760px){#slide-1.title-cover{padding-top:85px;min-height:calc(100svh - 167px)}.title-cover .cover-title{padding:35px 22px;width:100%}.title-cover h1{font-size:clamp(43px,11vw,75px)}.method-context{font-size:14px}}

.js #slide-1.title-cover:not(.active){display:none}

.everyday-example{margin-top:24px;padding:19px 21px;border:1px solid #e9d4a038;border-right:3px solid #e9d4a0;border-radius:12px;background:#e9d4a008}.everyday-example h3{font-size:17px;font-weight:600;color:#f6dfaa;margin:0 0 9px}.everyday-example p{font-size:16px;line-height:1.95;color:#e4eadf}.lesson-copy{font-size:18px;line-height:1.95}.data-example{font-size:16px}.panel-bottom{font-size:14px}.variables>div{font-size:16px}.slide,.js .slide{align-items:center}#slide-6{align-items:start}.mcq-card button{font-size:16px}.mcq-card legend{font-size:18px}@media(min-width:1450px){.lesson-copy{font-size:20px}.everyday-example p{font-size:18px}}@media(max-width:760px){.lesson-copy{font-size:17px}.everyday-example{padding:17px;margin-top:20px}.everyday-example p{font-size:16px}.variables>div{font-size:14px}.data-example{font-size:14px}}

.lesson-copy{font-size:23px;line-height:1.9}.insight p{font-size:20px}.insight span{font-size:14px}.cup-comparison{display:grid;grid-template-columns:1fr 1fr;gap:15px}.cup-comparison>div{background:#ffffff06;border:1px solid #ffffff22;border-radius:15px;text-align:center;padding:18px 8px}.cup-comparison>div+div{border-color:#e5bb7f66;background:#ebac5809}.cup-comparison h3{font-size:23px;font-weight:500}.cup-comparison .beaker{height:190px;width:100%}.cup-comparison p{font-size:14px;color:#d7decf}.measure-question{font-size:21px;text-align:center;padding-top:25px;color:#f2dcaf}.ozone-steps{list-style:none;padding:0;margin:0;display:grid;gap:22px}.ozone-steps li{display:flex;align-items:center;gap:17px;border:1px solid #e9d4a02b;padding:24px 18px;border-radius:15px;background:#ffffff04}.ozone-steps li>span{display:grid;place-items:center;border-radius:50%;background:#d5edb514;width:45px;height:45px;flex-shrink:0;color:#e9d4a0;font-size:25px}.ozone-steps p{font-size:21px;line-height:1.7}.variables>div{font-size:17px;padding:15px 0}@media(max-width:760px){.lesson-copy{font-size:21px}.insight p{font-size:18px}.cup-comparison .beaker{height:140px}.cup-comparison h3{font-size:19px}.cup-comparison p{font-size:12px}.measure-question{font-size:18px}.ozone-steps p{font-size:18px}.variables>div{font-size:14px}}

.core-facts{border-top:1px solid var(--line);margin-top:23px;padding-top:20px}.core-facts h3{font-size:18px;color:#f1dbad;font-weight:600;margin-bottom:10px}.core-facts p{font-size:16px;line-height:1.95;color:#dce7d8;margin-top:9px}.discussion-prompt{padding:16px 19px;border-right:3px solid #e8cd8d;background:#e8cd8d0b;font-size:16px;line-height:1.9;margin-top:23px;border-radius:10px}.data-sorter{border-top:1px solid var(--line);padding-top:24px;margin-top:24px}.data-sorter h3{font-size:19px;font-weight:500}#sort-example{font-size:26px;color:#f4dfaf;margin:17px 0}.activity-actions{display:flex;gap:10px;flex-wrap:wrap}.activity-actions button,.heat-row button,.quiet-action,.question-nav button,.question-toolbar button{background:#263c2c;border:1px solid #d6e3be44;border-radius:10px;padding:10px 15px;color:#edf0e2;font-size:14px;min-height:44px}.activity-actions button:hover:not(:disabled),.quiet-action:hover{background:#345d40}#sort-feedback{font-size:15px;line-height:1.8;min-height:32px;margin:15px 0}.lab-controls{margin-top:22px}.lab-controls label{font-size:17px;display:block;margin-bottom:15px}.heat-row{display:flex;gap:12px;align-items:center;margin-bottom:20px}.heat-row input{min-width:0;flex:1;accent-color:#efc285;direction:ltr}.heat-row button{white-space:nowrap;font-size:16px}.activity-actions .lab-primary{background:#eee5ce;color:#17271c}.lab-observation{border:1px solid #e4cc9455;background:#e4cc9410;border-radius:12px;padding:17px;margin-top:18px}.lab-observation h3{font-size:16px;color:#f3d598}.lab-observation p{font-size:17px;line-height:1.9;margin-top:7px}#lab-status{font-size:14px;line-height:1.8;margin-top:17px;color:#deead9}.model-note{font-size:12px;line-height:1.8;color:#c0cebe;margin-top:14px}.zoom-question{color:#ecd7a6!important;background:#e2c48c10!important;font-size:13px!important;padding:7px 12px!important}.review-heading .quiet-action{margin-top:13px}#question-dialog{max-width:none;width:100vw;height:100dvh;max-height:none;margin:0;padding:35px 7vw;border:0;border-radius:0;background:radial-gradient(ellipse at top,#223b2b,#071710);overflow:auto}#question-dialog .question-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:18px}#question-dialog .question-toolbar h2{font-size:24px;margin:0;letter-spacing:0}#question-host{max-width:1050px;margin:7vh auto 30px}#question-host .mcq-card{padding:35px;background:#0d2016cc}#question-host legend{font-size:clamp(25px,3.5vw,46px);line-height:1.7;margin-bottom:30px}#question-host [data-option]{font-size:clamp(20px,2.3vw,30px);padding:19px 25px;margin:15px 0}#question-host .mcq-feedback{font-size:22px;line-height:1.9}.question-nav{max-width:1050px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:15px}#question-position{direction:ltr;color:#e9d4a0;font:18px Arial}.cup-comparison .salt{transition:opacity .12s linear,transform .12s linear}
@media(max-width:760px){.core-facts p{font-size:15px}.core-facts h3{font-size:17px}.heat-row{gap:7px}.heat-row button{font-size:14px;padding:10px}.lab-observation p{font-size:16px}.activity-actions button{font-size:13px;padding:10px 12px}.discussion-prompt{font-size:15px}#question-dialog{padding:20px 5vw}#question-host{margin-top:30px}#question-host .mcq-card{padding:23px 17px}#question-host .mcq-feedback{font-size:17px}.question-toolbar button,.question-nav button{font-size:12px;padding:10px}#question-dialog .question-toolbar h2{font-size:18px}.question-nav{gap:8px}}