.lesson-site{background:#f8f5ed}.grade-hero{min-height:510px;padding:85px clamp(24px,8vw,130px);display:flex;align-items:center;justify-content:space-between;background:#e4ead3;overflow:hidden}.grade-hero h1{font-size:clamp(65px,9vw,125px)}.grade-hero p{font-size:18px;line-height:1.65;max-width:560px;color:#58645c}.grade-number{font:800 clamp(180px,27vw,390px)/.8 Manrope;color:#1e6248;letter-spacing:-.12em;opacity:.13}.grade-number small{font-size:.15em;vertical-align:top;letter-spacing:0}.grade-layout{display:grid;grid-template-columns:230px 1fr;gap:70px;max-width:1400px;margin:auto;padding:90px clamp(24px,6vw,90px)}.grade-nav{position:sticky;top:120px;align-self:start;display:grid;gap:7px}.grade-nav>span{font-size:10px;letter-spacing:.16em;font-weight:800;color:#819087;margin-bottom:10px}.grade-nav>a{padding:11px 0;border-bottom:1px solid var(--line);font-weight:700;font-size:14px}.grade-nav>a:hover{color:var(--green)}.progress-box{margin-top:25px;padding:20px;background:var(--ink);color:white;border-radius:15px}.progress-box strong,.progress-box span{display:block}.progress-box strong{font:700 24px Manrope}.progress-box span{font-size:10px;color:#b9c5be;margin:5px 0 14px}.progress-box div{height:5px;background:#ffffff20;border-radius:5px}.progress-box i{display:block;height:100%;width:0;background:var(--lime);border-radius:5px;transition:.3s}.curriculum{min-width:0}.curriculum-block{padding:0 0 110px;margin-bottom:90px;border-bottom:1px solid var(--line);scroll-margin-top:110px}.subject-intro{display:grid;grid-template-columns:70px 1fr;gap:25px;margin-bottom:35px}.subject-number{font:700 12px Manrope;width:48px;height:48px;display:grid;place-items:center;border:1px solid var(--ink);border-radius:50%}.subject-intro h2{font-size:clamp(37px,5vw,64px);letter-spacing:-.05em;margin:8px 0 12px}.subject-intro p{color:#69756e}.topic-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.topic-card{border:1px solid var(--line);border-radius:14px;background:#fff;padding:19px 20px;display:grid;grid-template-columns:38px 1fr auto;gap:13px;align-items:center;text-align:left;color:var(--ink)}.topic-card:hover{transform:translateY(-2px);box-shadow:0 10px 28px #28382f13}.topic-icon{width:37px;height:37px;border-radius:10px;background:#f1f0e9;display:grid;place-items:center;font-weight:800}.topic-card strong{display:block;font:700 15px Manrope}.topic-card small{color:#818b85}.topic-card .status{font-size:10px;text-transform:uppercase;letter-spacing:.08em;font-weight:800;color:#89938d}.topic-card.ready .status{background:#dcebd5;color:#326b48;padding:5px 7px;border-radius:999px}.math-block .ready .topic-icon{background:#f5d2ba}.english-block .ready .topic-icon{background:#efe3a8}.science-block .ready .topic-icon{background:#cde5d2}.social-block .ready .topic-icon{background:#c5e0e6}dialog{width:min(820px,calc(100% - 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@media(max-width:850px){.grade-number{display:none}.grade-layout{grid-template-columns:1fr}.grade-nav{position:static;grid-template-columns:repeat(4,1fr);gap:5px}.grade-nav>span,.progress-box{grid-column:1/-1}.grade-nav>a{font-size:11px}.topic-list{grid-template-columns:1fr}.lesson-cover,.lesson-body{padding-left:28px;padding-right:28px}}@media(max-width:520px){.grade-hero{min-height:440px}.grade-layout{padding-top:55px}.grade-nav{grid-template-columns:1fr 1fr}.subject-intro{grid-template-columns:1fr}.curriculum-block{padding-bottom:70px;margin-bottom:65px}.topic-card{grid-template-columns:35px 1fr}.topic-card .status{grid-column:2}.lesson-cover{padding-top:52px}dialog{max-height:95vh}}
.memory-box,.challenge-box{padding:22px;border-radius:15px;line-height:1.7}.memory-box{background:#f4e4b2}.challenge-box{background:#dbe8ec;border-left:4px solid #347287}.practice-list{padding-left:22px}.practice-list li{padding:9px 0;border-bottom:1px solid var(--line)}.review-sheet{background:#17261f;color:#fff;padding:28px;border-radius:17px}.review-sheet>span{color:#a7d9b5}.review-sheet h3{color:#fff}.review-sheet li{color:#d7dfda;padding:6px 0}.lesson-section{scroll-margin-top:20px}
.guided-hints{margin:38px 0;padding:28px;border-radius:17px;background:#f2e4c8;border:1px solid #dcc99f}.guided-hints>span{font-size:11px;letter-spacing:.15em;font-weight:800;color:#9a5d28}.guided-hints h3{font-size:28px;margin:8px 0}.guided-hints>p{color:#6b6252}.hint-buttons{display:flex;gap:7px;flex-wrap:wrap;margin:20px 0}.hint-buttons button{border:1px solid #c7b78f;background:white;border-radius:999px;padding:9px 12px;font-weight:700}.hint-buttons button.revealed{background:#17261f;color:white;border-color:#17261f}.hint-output{min-height:70px;padding:18px;border-radius:11px;background:white;line-height:1.65;font-weight:600}
.lesson-model{overflow-x:auto}.model-caption{margin:14px 0 0;text-align:center;font-weight:700}.ratio-model{display:grid;gap:8px;max-width:520px;margin:auto}.ratio-model>div{display:grid;grid-template-columns:70px repeat(3,1fr);gap:8px}.ratio-model span,.ratio-model b{padding:13px;text-align:center;border-radius:9px;background:#fff}.ratio-model span{background:var(--ink);color:#fff}.evidence-chain,.organization-model{display:flex;align-items:center;justify-content:center;gap:12px;min-width:570px}.evidence-chain>div,.organization-model>div{flex:1;text-align:center;padding:18px 10px;background:#fff;border-radius:12px}.evidence-chain span,.organization-model small{display:block;margin-top:7px;color:#647068;font-size:12px}.evidence-chain i,.organization-model i{font-style:normal;font-weight:800;color:var(--green)}.medieval-model{display:grid;grid-template-columns:1fr 1fr;gap:10px}.medieval-model>div{padding:18px;background:#fff;border-radius:12px}.medieval-model b,.medieval-model span{display:block}.medieval-model span{font-size:13px;line-height:1.5;color:#657169;margin-top:5px}.full-lesson strong{color:#263f33}.quick-check>span{font-size:10px;letter-spacing:.17em;font-weight:800;color:var(--green)}
@media(max-width:520px){.medieval-model{grid-template-columns:1fr}.lesson-model{padding:16px}.ratio-model>div{grid-template-columns:52px repeat(3,1fr)}.ratio-model span,.ratio-model b{padding:10px 5px}}
.number-line-model{display:grid;grid-template-columns:repeat(7,1fr);min-width:520px;border-top:3px solid var(--ink);margin:28px 0 8px}.number-line-model span,.number-line-model b{position:relative;text-align:center;padding-top:13px}.number-line-model span:before,.number-line-model b:before{content:"";position:absolute;top:-8px;left:50%;height:13px;border-left:2px solid var(--ink)}.number-line-notes{display:flex;justify-content:space-between;gap:18px;min-width:520px}.theme-model,.genetics-model,.knowledge-cycle{display:flex;align-items:center;justify-content:center;gap:10px;min-width:650px}.theme-model>div,.genetics-model>div,.knowledge-cycle>div{flex:1;padding:17px 10px;text-align:center;background:#fff;border-radius:12px}.theme-model span,.genetics-model span,.knowledge-cycle span{display:block;margin-top:6px;color:#647068;font-size:12px;line-height:1.4}.theme-model i,.genetics-model i,.knowledge-cycle i{font-style:normal;font-weight:800;color:var(--green)}.punnett-model{display:grid;grid-template-columns:42px 1fr 1fr;gap:6px;max-width:330px;margin:20px auto 0}.punnett-model>*{display:grid;place-items:center;min-height:42px;border-radius:8px}.punnett-model b,.punnett-model strong{background:var(--ink);color:#fff}.punnett-model i{background:#dcebd5;font-style:normal;font-weight:800}
.expression-model,.character-model,.ecosystem-model{display:flex;align-items:center;justify-content:center;gap:10px;min-width:680px}.expression-model>div,.character-model>div,.ecosystem-model>div{flex:1;padding:17px 10px;text-align:center;background:#fff;border-radius:12px}.expression-model span,.character-model span,.ecosystem-model span{display:block;margin-top:6px;color:#647068;font-size:12px;line-height:1.4}.expression-model i,.character-model i,.ecosystem-model i{font-style:normal;font-weight:800;color:var(--green)}.matter-cycle{display:flex;align-items:center;justify-content:center;gap:9px;min-width:620px;margin-top:16px}.matter-cycle span{padding:10px 13px;background:#dcebd5;border-radius:999px;font-size:12px;font-weight:700}.matter-cycle i{font-style:normal;font-weight:800}.kingdoms-model{display:grid;grid-template-columns:1fr 1fr;gap:10px}.kingdoms-model>div{padding:18px;background:#fff;border-radius:12px}.kingdoms-model b,.kingdoms-model span{display:block}.kingdoms-model span{margin-top:6px;color:#647068;font-size:12px;line-height:1.5}@media(max-width:520px){.kingdoms-model{grid-template-columns:1fr}}

/* Calm lesson reader: generous spacing, controlled line length, clear subject rhythm. */
dialog{width:min(980px,calc(100% - 32px));max-height:92vh;border-radius:28px;background:#fbfaf6}
.dialog-close{margin:18px 18px -56px 0;box-shadow:0 4px 16px #17261f26}
.lesson-cover{padding:72px clamp(34px,7vw,78px) 56px;border-bottom:1px solid #cfd8ce}
.subject-math .lesson-cover{background:#f6dfcf}.subject-english .lesson-cover{background:#f4edc8}.subject-science .lesson-cover{background:#e1efdf}.subject-social .lesson-cover{background:#dfecef}
.lesson-cover h2{max-width:800px;font-size:clamp(42px,6vw,68px);line-height:1.02;margin:16px 0 20px}
.lesson-cover p{max-width:62ch;font-size:19px;line-height:1.7;margin:0;color:#405048}
.lesson-body{padding:20px clamp(30px,7vw,78px) 72px;background:#fbfaf6}
.lesson-section{margin:0;padding:48px 0;border-bottom:1px solid #dfe3dc}
.lesson-section:last-of-type{border-bottom:0}
.lesson-section>span{display:block;margin-bottom:12px;font-size:12px;line-height:1.5;letter-spacing:.13em}
.lesson-section h3{max-width:760px;font-size:clamp(25px,3.2vw,33px);line-height:1.18;margin:0 0 22px;letter-spacing:-.025em}
.lesson-section h4,.worked-example h4,.subheading{font:800 18px/1.4 Manrope;margin:24px 0 14px}
.lesson-section p,.lesson-section li{max-width:72ch;font-size:17px;line-height:1.8;color:#3f4f47}
.lesson-section p{margin:0}.lesson-section p+p{margin-top:18px}
.concept-box,.memory-box,.challenge-box,.spotlight-box,.writing-prompt,.real-world-note{max-width:760px;padding:27px 29px;border-radius:16px;font-size:17px;line-height:1.75}
.concept-box{margin:22px 0 0}.memory-box{border-left:4px solid #c69a25}.challenge-box{border-left-width:5px}
.real-world-note{display:block;margin-top:24px;background:#eef2e9;border-left:4px solid var(--green)}
.example-steps{display:grid;gap:12px;max-width:780px;margin:0;padding:0}
.example-steps li{margin:0;padding:17px 20px 17px 16px;background:#fff;border:1px solid #e1e4de;border-radius:13px;align-items:start}
.example-steps li:before{margin-top:2px}
.practice-list{display:grid;gap:12px;max-width:780px;margin:0;padding:0;list-style:none;counter-reset:practice}
.practice-list li{counter-increment:practice;position:relative;padding:18px 20px 18px 58px;border:1px solid #e0e4dd;border-radius:13px;background:#fff}
.practice-list li:before{content:counter(practice);position:absolute;left:18px;top:18px;width:25px;height:25px;display:grid;place-items:center;border-radius:50%;background:#e6ece3;color:#254b38;font:800 12px Manrope}
.difficulty-list li:after{content:attr(data-level);display:block;margin-top:8px;color:#78847d;font:800 11px Manrope;letter-spacing:.08em;text-transform:uppercase}
.quick-check{max-width:800px;margin:40px 0;padding:32px;border:1px solid #cdd8c7;background:#eef4e5}
.lesson-section .quick-check{margin:32px 0 0;border-bottom:1px solid #cdd8c7}
.quick-check h3{margin-bottom:12px}.quick-check h4{max-width:680px;margin:0 0 20px;font-size:19px}
.check-options{gap:10px}.check-options button{padding:15px 17px;font-size:16px;line-height:1.45;border-radius:11px}
.check-feedback{margin-top:15px!important;min-height:24px;font-size:15px!important;line-height:1.55!important}
.answer-key{margin:46px 0;padding:34px;background:#edf1eb;border:1px solid #d5ddd2;border-radius:18px}
.answer-key ol{display:grid;gap:14px;padding-left:24px;margin:0}.answer-key li{padding-left:8px}
.vocab-grid,.people-grid,.map-notes{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:800px}
.vocab-grid>div,.people-grid>div,.map-notes>div{padding:20px;background:#fff;border:1px solid #e0e4dd;border-radius:13px;line-height:1.6}
.vocab-grid b,.vocab-grid span,.people-grid b,.people-grid span{display:block}.vocab-grid span,.people-grid span{margin-top:6px;color:#56645d}
.spotlight-box{background:#f4edc8;border-left:4px solid #b79522}
.writing-prompt{background:#fff;border:1px solid #ded7ad}
.tip-list{display:grid;gap:10px;max-width:760px;padding-left:22px}
.timeline{position:relative;display:grid;gap:0;max-width:800px;margin-left:8px;border-left:2px solid #afc2b7}
.timeline>div{position:relative;display:grid;grid-template-columns:120px 1fr;gap:22px;padding:5px 0 25px 28px}
.timeline>div:before{content:"";position:absolute;left:-7px;top:10px;width:12px;height:12px;border-radius:50%;background:var(--green);box-shadow:0 0 0 5px #fbfaf6}
.timeline b{font-family:Manrope}.timeline span{line-height:1.65;color:#48574f}
.map-notes>div{padding-left:44px;position:relative}.map-notes>div:before{content:"⌖";position:absolute;left:18px;color:var(--green);font-size:20px}
.cause-chain{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;max-width:820px}
.cause-chain>div{position:relative;padding:23px;background:#fff;border:1px solid #dae0d8;border-radius:14px}
.cause-chain>div:not(:last-child):after{content:"→";position:absolute;right:-22px;top:42%;font-weight:900;color:var(--green)}
.cause-chain small,.cause-chain span{display:block}.cause-chain small{margin-bottom:10px;color:var(--green);font-weight:800;letter-spacing:.09em}.cause-chain span{line-height:1.6}
.review-sheet{max-width:820px;margin:48px 0;padding:38px 40px;border-radius:20px}.review-sheet h3{margin-bottom:20px}.review-sheet ul{display:grid;gap:7px;margin:0;padding-left:22px}.review-sheet li{font-size:16px;line-height:1.65}
.guided-hints{max-width:820px;margin:48px 0 28px;padding:32px}.hint-buttons{margin:22px 0 15px}.hint-output{font-size:16px;line-height:1.7;padding:20px}
.complete-lesson{max-width:820px;padding:17px;font-size:16px}

@media(max-width:700px){
  dialog{width:calc(100% - 16px);max-height:96vh;border-radius:20px}
  .lesson-cover{padding:62px 24px 38px}.lesson-cover p{font-size:17px}
  .lesson-body{padding:8px 24px 46px}.lesson-section{padding:38px 0}
  .lesson-section p,.lesson-section li{font-size:16px;line-height:1.72}
  .concept-box,.memory-box,.challenge-box,.spotlight-box,.writing-prompt,.real-world-note{padding:22px}
  .vocab-grid,.people-grid,.map-notes{grid-template-columns:1fr}
  .timeline>div{grid-template-columns:1fr;gap:5px}
  .cause-chain{grid-template-columns:1fr;gap:12px}.cause-chain>div:not(:last-child):after{content:"↓";right:auto;left:50%;top:auto;bottom:-18px}
  .quick-check,.answer-key,.review-sheet,.guided-hints{padding:24px}
}

/* Keep each worked-example explanation in the full content column. */
.example-steps li{
  position:relative;
  display:block;
  margin:0;
  padding:17px 20px 17px 64px;
}
.example-steps li::before{
  position:absolute;
  left:20px;
  top:18px;
  margin:0;
}
.example-steps li>strong:first-child,
.example-steps li>b:first-child{
  display:block;
  margin:0 0 9px;
  font:800 18px/1.4 Manrope;
  color:#263f33;
}
.example-steps li>p{
  width:auto;
  max-width:68ch;
  margin:0;
}
@media(max-width:700px){
  .example-steps li{padding:16px 17px 16px 56px}
  .example-steps li::before{left:16px;top:17px}
}

.reaction-model{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:center;min-width:620px}
.reaction-model>div{padding:22px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.reaction-model>strong{font:800 13px Manrope;color:var(--green)}
.reaction-model b,.reaction-model small{display:block}.reaction-model small{margin-top:14px;color:#627068}
.particles{min-height:58px;display:flex!important;align-items:center;justify-content:center;gap:9px;margin-top:15px}
.particles i{position:relative;display:block;width:27px;height:27px;border-radius:50%;background:#efb48e}
.particles i.b{background:#90c4cf}
.particles i.ab{width:55px;border-radius:999px;background:linear-gradient(90deg,#efb48e 0 46%,#90c4cf 54% 100%)}
.particles i.ab:after{content:"";position:absolute;left:50%;top:0;bottom:0;border-left:2px solid #fff}
@media(max-width:700px){.reaction-model{grid-template-columns:1fr;min-width:0}.reaction-model>strong{padding:0}.reaction-model>strong{font-size:0}.reaction-model>strong:after{content:"↓ rearrange ↓";font-size:13px}}

/* Reusable diagrams for the fifth Grade 7 lesson set. */
.scale-model,.argument-model,.east-asia-model,.geometry-model,.story-arc-model,.energy-flow-model,.renaissance-model,.probability-model,.research-cycle-model,.earth-systems-model,.reformation-model,.statistics-model,.language-model,.weather-climate-model,.exploration-model{display:flex;align-items:center;justify-content:center;gap:16px;min-width:620px}
.scale-model>div,.argument-model>div,.east-asia-model>div,.geometry-model>div,.story-arc-model>div,.energy-flow-model>div,.renaissance-model>div,.probability-model>div,.research-cycle-model>div,.earth-systems-model>div,.reformation-model>div,.statistics-model>div,.language-model>div,.weather-climate-model>div,.exploration-model>div{flex:1;min-height:94px;padding:20px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.scale-model b,.scale-model span,.argument-model b,.argument-model span,.east-asia-model b,.east-asia-model span,.geometry-model b,.geometry-model span,.story-arc-model b,.story-arc-model span,.energy-flow-model b,.energy-flow-model span,.renaissance-model b,.renaissance-model span,.probability-model b,.probability-model span,.research-cycle-model b,.research-cycle-model span,.earth-systems-model b,.earth-systems-model span,.reformation-model b,.reformation-model span,.statistics-model b,.statistics-model span,.language-model b,.language-model span,.weather-climate-model b,.weather-climate-model span,.exploration-model b,.exploration-model span{display:block}
.scale-model span,.argument-model span,.east-asia-model span,.geometry-model span,.story-arc-model span,.energy-flow-model span,.renaissance-model span,.probability-model span,.research-cycle-model span,.earth-systems-model span,.reformation-model span,.statistics-model span,.language-model span,.weather-climate-model span,.exploration-model span{margin-top:7px;color:#56645d;font-size:14px;line-height:1.5}
.scale-model>i,.argument-model>i,.east-asia-model>i,.geometry-model>i,.story-arc-model>i,.energy-flow-model>i,.renaissance-model>i,.probability-model>i,.research-cycle-model>i,.earth-systems-model>i,.reformation-model>i,.statistics-model>i,.language-model>i,.weather-climate-model>i,.exploration-model>i{font:800 14px Manrope;color:var(--green);font-style:normal}
.force-diagram{display:grid;grid-template-columns:1fr minmax(130px,180px) 1fr;align-items:center;gap:12px;min-width:620px}
.force-cart{padding:28px 18px;text-align:center;background:#fff;border:3px solid #365f4b;border-radius:15px;font:800 16px Manrope;color:#263f33;box-shadow:0 8px 0 #d6e3db}
.force-arrow{display:flex;flex-direction:column;gap:6px;font-family:Manrope}
.force-arrow.left{text-align:right}.force-arrow.right{text-align:left}.force-arrow b{font-size:19px}.force-arrow span{color:#56645d;font-weight:700}
@media(max-width:700px){
  .scale-model,.argument-model,.east-asia-model,.geometry-model,.story-arc-model,.energy-flow-model,.renaissance-model,.probability-model,.research-cycle-model,.earth-systems-model,.reformation-model,.statistics-model,.language-model,.weather-climate-model,.exploration-model{min-width:540px;gap:10px}
  .scale-model>div,.argument-model>div,.east-asia-model>div,.geometry-model>div,.story-arc-model>div,.energy-flow-model>div,.renaissance-model>div,.probability-model>div,.research-cycle-model>div,.earth-systems-model>div,.reformation-model>div,.statistics-model>div,.language-model>div,.weather-climate-model>div,.exploration-model>div{padding:16px 12px}
  .force-diagram{min-width:540px;grid-template-columns:1fr 130px 1fr}
}

/* Grade 8 concept pathways use the same spacious, scrollable model system. */
.equation-path-model,.close-reading-model,.selection-model,.government-ideas-model,.function-model,.symbol-theme-model,.force-analysis-model,.revolution-model,.systems-model,.purpose-craft-model,.energy-transfer-model,.constitution-model,.exponents-model,.informational-model,.early-republic-model{display:flex;align-items:center;justify-content:center;gap:16px;min-width:680px}
.equation-path-model>div,.close-reading-model>div,.selection-model>div,.government-ideas-model>div,.function-model>div,.symbol-theme-model>div,.force-analysis-model>div,.revolution-model>div,.systems-model>div,.purpose-craft-model>div,.energy-transfer-model>div,.constitution-model>div,.exponents-model>div,.informational-model>div,.early-republic-model>div{flex:1;min-height:100px;padding:20px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.equation-path-model b,.equation-path-model span,.close-reading-model b,.close-reading-model span,.selection-model b,.selection-model span,.government-ideas-model b,.government-ideas-model span,.function-model b,.function-model span,.symbol-theme-model b,.symbol-theme-model span,.force-analysis-model b,.force-analysis-model span,.revolution-model b,.revolution-model span,.systems-model b,.systems-model span,.purpose-craft-model b,.purpose-craft-model span,.energy-transfer-model b,.energy-transfer-model span,.constitution-model b,.constitution-model span,.exponents-model b,.exponents-model span,.informational-model b,.informational-model span,.early-republic-model b,.early-republic-model span{display:block}
.equation-path-model span,.close-reading-model span,.selection-model span,.government-ideas-model span,.function-model span,.symbol-theme-model span,.force-analysis-model span,.revolution-model span,.systems-model span,.purpose-craft-model span,.energy-transfer-model span,.constitution-model span,.exponents-model span,.informational-model span,.early-republic-model span{margin-top:7px;color:#56645d;font-size:14px;line-height:1.5}
.equation-path-model>i,.close-reading-model>i,.selection-model>i,.government-ideas-model>i,.function-model>i,.symbol-theme-model>i,.force-analysis-model>i,.revolution-model>i,.systems-model>i,.purpose-craft-model>i,.energy-transfer-model>i,.constitution-model>i,.exponents-model>i,.informational-model>i,.early-republic-model>i{font:800 14px Manrope;color:var(--green);font-style:normal}
.wave-svg{display:block;width:100%;min-width:620px;height:auto;background:#fff;border:1px solid #dfe4dc;border-radius:14px;padding:12px}
@media(max-width:700px){
  .equation-path-model,.close-reading-model,.selection-model,.government-ideas-model,.function-model,.symbol-theme-model,.force-analysis-model,.revolution-model,.systems-model,.purpose-craft-model,.energy-transfer-model,.constitution-model,.exponents-model,.informational-model,.early-republic-model{min-width:580px;gap:10px}
  .equation-path-model>div,.close-reading-model>div,.selection-model>div,.government-ideas-model>div,.function-model>div,.symbol-theme-model>div,.force-analysis-model>div,.revolution-model>div,.systems-model>div,.purpose-craft-model>div,.energy-transfer-model>div,.constitution-model>div,.exponents-model>div,.informational-model>div,.early-republic-model>div{padding:16px 12px}
  .wave-svg{min-width:560px}
}

/* High-contrast text for the shared dark review card in every grade. */
.lesson-section.review-sheet{
  color:#f7faf8;
}
.lesson-section.review-sheet h3,
.lesson-section.review-sheet strong,
.lesson-section.review-sheet b{
  color:#fff;
}
.lesson-section.review-sheet p,
.lesson-section.review-sheet li,
.lesson-section.review-sheet a{
  color:#e3ece7;
  opacity:1;
}
.lesson-section.review-sheet li::marker{
  color:#a7d9b5;
}

/* Grade 8 lesson set five: readable pathways and an original circuit diagram. */
.scientific-model,.evidence-argument-model,.expansion-reform-model{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:14px;
  min-width:720px;
}
.scientific-model>div,.evidence-argument-model>div,.expansion-reform-model>div{
  flex:1;
  min-height:104px;
  padding:20px 16px;
  text-align:center;
  background:#fff;
  border:1px solid #dfe4dc;
  border-radius:14px;
}
.scientific-model b,.scientific-model span,
.evidence-argument-model b,.evidence-argument-model span,
.expansion-reform-model b,.expansion-reform-model span{
  display:block;
}
.scientific-model span,.evidence-argument-model span,.expansion-reform-model span{
  margin-top:7px;
  color:#56645d;
  font-size:14px;
  line-height:1.5;
}
.scientific-model>i,.evidence-argument-model>i,.expansion-reform-model>i{
  color:var(--green);
  font:800 13px/1.35 Manrope;
  font-style:normal;
  text-align:center;
}
.circuit-svg{
  display:block;
  width:100%;
  min-width:660px;
  height:auto;
  padding:12px;
  background:#fff;
  border:1px solid #dfe4dc;
  border-radius:14px;
}
@media(max-width:700px){
  .scientific-model,.evidence-argument-model,.expansion-reform-model{
    min-width:600px;
    gap:9px;
  }
  .scientific-model>div,.evidence-argument-model>div,.expansion-reform-model>div{
    padding:16px 11px;
  }
  .circuit-svg{min-width:600px}
}

/* Grade 8 lesson set six: transformations, narrative structure, particles, and Civil War causation. */
.narrative-craft-model,.civil-war-model{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:14px;
  min-width:720px;
}
.narrative-craft-model>div,.civil-war-model>div{
  flex:1;
  min-height:104px;
  padding:20px 16px;
  text-align:center;
  background:#fff;
  border:1px solid #dfe4dc;
  border-radius:14px;
}
.narrative-craft-model b,.narrative-craft-model span,
.civil-war-model b,.civil-war-model span{
  display:block;
}
.narrative-craft-model span,.civil-war-model span{
  margin-top:7px;
  color:#56645d;
  font-size:14px;
  line-height:1.5;
}
.narrative-craft-model>i,.civil-war-model>i{
  color:var(--green);
  font:800 13px/1.35 Manrope;
  font-style:normal;
}
.transform-svg{
  display:block;
  width:100%;
  min-width:650px;
  height:auto;
  padding:12px;
  background:#fff;
  border:1px solid #dfe4dc;
  border-radius:14px;
}
.particle-reaction-model{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:22px;
  align-items:center;
  min-width:660px;
}
.particle-reaction-model>div{
  padding:22px;
  text-align:center;
  background:#fff;
  border:1px solid #dfe4dc;
  border-radius:14px;
}
.particle-reaction-model>div>b,.particle-reaction-model>div>small{
  display:block;
}
.particle-reaction-model>div>small{
  margin-top:13px;
  color:#56645d;
  font:800 15px Manrope;
}
.particle-reaction-model>strong{
  color:var(--green);
  font:800 13px Manrope;
}
.particle-row{
  display:flex;
  justify-content:center;
  align-items:center;
  gap:5px;
  min-height:66px;
  margin-top:13px;
}
.particle-row i{
  display:block;
  width:27px;
  height:27px;
  border-radius:50%;
  box-shadow:inset 0 -4px 0 #00000018;
}
.particle-row .atom-h{background:#90c4cf}
.particle-row .atom-o{width:34px;height:34px;background:#ef9e8e}
.particle-row em{
  margin:0 8px;
  color:#6b766f;
  font:800 18px Manrope;
  font-style:normal;
}
@media(max-width:700px){
  .narrative-craft-model,.civil-war-model{min-width:600px;gap:9px}
  .narrative-craft-model>div,.civil-war-model>div{padding:16px 11px}
  .transform-svg{min-width:590px}
  .particle-reaction-model{min-width:600px;gap:14px}
  .particle-reaction-model>div{padding:17px 12px}
}
.pythagorean-model{display:grid;grid-template-columns:1fr auto 1.35fr auto 1.7fr;gap:12px;align-items:center}.pyth-square{aspect-ratio:1;border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:14px;border:2px solid #1e6248}.pyth-square b{font:800 clamp(24px,4vw,46px) Manrope}.pyth-square span{font-size:12px;margin-top:6px}.pyth-a{background:#dbe993}.pyth-b{background:#b9d8c1}.pyth-c{background:#efb48e}.pyth-plus,.pyth-equals{font:800 28px Manrope;color:#1e6248}.earth-history-svg{width:100%;min-width:640px;height:auto}.earth-history-svg text{font:600 16px "DM Sans",sans-serif;fill:#263f33}.lesson-model:has(.earth-history-svg){overflow-x:auto}@media(max-width:680px){.pythagorean-model{grid-template-columns:1fr}.pyth-square{width:min(190px,75%);margin:auto}.pyth-plus,.pyth-equals{text-align:center}.earth-history-svg{min-width:610px}}
.volume-model{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.volume-model>div{min-height:240px;padding:20px 14px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:16px}.volume-model b,.volume-model strong,.volume-model small{display:block}.volume-model strong{margin-top:12px;font:800 22px Manrope;color:#1e6248}.volume-model small{margin-top:6px;color:#59655f;line-height:1.45}.solid{position:relative;display:block;width:82px;height:88px;margin:18px auto 4px}.cylinder-solid{border:3px solid #315f80;border-radius:50%/14%;background:linear-gradient(90deg,#d9eef4,#fff,#b9dce7)}.cylinder-solid:before,.cylinder-solid:after{content:"";position:absolute;left:-3px;width:82px;height:22px;border:3px solid #315f80;border-radius:50%;background:#d9eef4}.cylinder-solid:before{top:-3px}.cylinder-solid:after{bottom:-3px;background:#b9dce7}.cone-solid{clip-path:polygon(50% 0,100% 84%,92% 94%,75% 99%,50% 100%,25% 99%,8% 94%,0 84%);background:linear-gradient(90deg,#f4d39c,#fff1cf,#e6b66f);border-bottom:4px solid #a66519}.sphere-solid{width:88px;height:88px;border-radius:50%;background:radial-gradient(circle at 32% 27%,#fff,#c9dfca 35%,#6ca47e 76%,#2e6b49);box-shadow:inset -8px -8px 14px #174e3440}.earth-space-svg{width:100%;min-width:650px;height:auto}.earth-space-svg text{font:600 15px "DM Sans",sans-serif;fill:#243c49}.lesson-model:has(.earth-space-svg){overflow-x:auto}.civics-model{display:flex;align-items:stretch;justify-content:center;gap:10px;min-width:820px}.civics-model>div{flex:1;min-height:118px;padding:18px 12px;display:flex;flex-direction:column;justify-content:center;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}.civics-model b,.civics-model span{display:block}.civics-model span{margin-top:8px;color:#56645d;font-size:13px;line-height:1.45}.civics-model>i{align-self:center;font:800 16px Manrope;color:#1e6248;font-style:normal}.lesson-model:has(.civics-model){overflow-x:auto}@media(max-width:700px){.volume-model{grid-template-columns:1fr}.volume-model>div{min-height:210px}.earth-space-svg{min-width:620px}.civics-model{min-width:760px}}

/* Grade 6 full-lesson diagrams and mobile readability. */
.grade6-ratio-model{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;min-width:620px}
.grade6-ratio-model>div{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;padding:20px;background:#fff;border:1px solid #dfe4dc;border-radius:14px;text-align:center}
.grade6-ratio-model>i{font:800 13px Manrope;color:var(--green);font-style:normal}
.grade6-ratio-model span{color:#657169;font-weight:800}
.cell-svg{display:block;width:100%;min-width:650px;height:auto;background:#fff;border:1px solid #dfe4dc;border-radius:14px;padding:10px}
.cell-svg text{font:700 15px "DM Sans",sans-serif;fill:#263f33}
.lesson-model:has(.cell-svg){overflow-x:auto}
@media(max-width:700px){.grade6-ratio-model{min-width:590px}.cell-svg{min-width:600px}}

/* Grade 6 second lesson set: fractions, body systems, and responsive pathways. */
.fraction-model,.body-systems-model{display:flex;align-items:center;justify-content:center;gap:14px;min-width:720px}
.fraction-model>div,.body-systems-model>div{flex:1;min-height:104px;padding:20px 14px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.fraction-model b,.fraction-model span,.body-systems-model b,.body-systems-model span{display:block}
.fraction-model span,.body-systems-model span{margin-top:8px;color:#56645d;font-size:14px;line-height:1.5}
.fraction-model>i,.body-systems-model>i{font:800 13px/1.4 Manrope;color:var(--green);font-style:normal;text-align:center}
@media(max-width:700px){.fraction-model,.body-systems-model{min-width:620px;gap:9px}.fraction-model>div,.body-systems-model>div{padding:16px 10px}}

/* Grade 6 third lesson set: place value and ecosystem pathways. */
.decimal-model{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;align-items:stretch;min-width:620px}
.decimal-model>div{padding:20px 12px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.decimal-model b,.decimal-model span{display:block}.decimal-model b{font:800 30px Manrope}.decimal-model span{margin-top:8px;color:#56645d;font-size:13px}
.decimal-model>i{display:grid;place-items:center;font:800 28px Manrope;color:var(--green);font-style:normal}
.ecosystem-flow-model{display:flex;align-items:center;justify-content:center;gap:10px;min-width:800px}
.ecosystem-flow-model>div{flex:1;min-height:100px;padding:18px 12px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.ecosystem-flow-model b,.ecosystem-flow-model span{display:block}.ecosystem-flow-model span{margin-top:7px;color:#56645d;font-size:13px;line-height:1.45}
.ecosystem-flow-model>i{font:800 13px Manrope;color:var(--green);font-style:normal;text-align:center}
@media(max-width:700px){.decimal-model{min-width:580px}.ecosystem-flow-model{min-width:720px;gap:8px}.ecosystem-flow-model>div{padding:15px 9px}}

/* Grade 6 fourth lesson set: energy-transfer pathway. */
.energy-transfer-model{display:flex;align-items:center;justify-content:center;gap:10px;min-width:780px}
.energy-transfer-model>div{flex:1;min-height:104px;padding:19px 12px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.energy-transfer-model b,.energy-transfer-model span{display:block}
.energy-transfer-model span{margin-top:8px;color:#4c5b53;font-size:13px;line-height:1.45}
.energy-transfer-model>i{font:800 13px/1.35 Manrope;color:var(--green);font-style:normal;text-align:center}
@media(max-width:700px){.energy-transfer-model{min-width:700px;gap:8px}.energy-transfer-model>div{padding:16px 9px}}

/* Grade 6 fifth lesson set: Earth interior cutaway. */
.earth-layers-svg{display:block;width:100%;min-width:660px;height:auto;padding:10px;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.earth-layers-svg text{font:700 15px/1.4 "DM Sans",sans-serif;fill:#263f33}
.lesson-model:has(.earth-layers-svg){overflow-x:auto}
.root-number-line{position:relative;display:flex;justify-content:space-between;align-items:flex-end;min-width:520px;margin:46px 22px 18px;padding-top:18px;border-top:4px solid #1e6248}.root-number-line:before{content:"";position:absolute;left:0;right:0;top:-9px;height:14px;background:repeating-linear-gradient(90deg,#1e6248 0 2px,transparent 2px calc(50% - 1px),#1e6248 calc(50% - 1px) calc(50% + 1px),transparent calc(50% + 1px) 100%)}.root-number-line b{font:800 17px Manrope}.root-number-line i,.root-number-line em{position:absolute;top:-55px;transform:translateX(-50%);padding:7px 9px;border-radius:8px;background:#1e6248;color:#fff;font-size:13px;font-style:normal;white-space:nowrap}.root-number-line em{background:#315f80}.engineering-cycle{display:flex;align-items:stretch;justify-content:center;gap:10px;min-width:780px}.engineering-cycle>div{flex:1;min-height:118px;padding:18px 12px;display:flex;flex-direction:column;justify-content:center;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}.engineering-cycle b,.engineering-cycle span{display:block}.engineering-cycle span{margin-top:8px;color:#56645d;font-size:13px;line-height:1.45}.engineering-cycle i{align-self:center;font:800 20px Manrope;color:#1e6248;font-style:normal}@media(max-width:680px){.root-number-line{min-width:480px}.engineering-cycle{min-width:720px}}
@media(max-width:700px){.earth-layers-svg{min-width:610px}}

/* Grade 6 sixth lesson set: weather-to-climate system pathway. */
.weather-system-model{display:flex;align-items:center;justify-content:center;gap:8px;min-width:940px}
.weather-system-model>div{flex:1;min-height:108px;padding:18px 10px;text-align:center;background:#fff;border:1px solid #dfe4dc;border-radius:14px}
.weather-system-model b,.weather-system-model span{display:block}
.weather-system-model span{margin-top:8px;color:#4c5b53;font-size:13px;line-height:1.45}
.weather-system-model>i{font:800 12px/1.35 Manrope;color:var(--green);font-style:normal;text-align:center}
@media(max-width:700px){.weather-system-model{min-width:820px}.weather-system-model>div{padding:15px 8px}}

.momentum-model,.wave-model{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;max-width:820px;padding:26px;border:1px solid #c9d8d1;border-radius:17px;background:#eef4f0;overflow-x:auto}.momentum-model>div,.wave-model>div{padding:18px;border-radius:13px;background:#fff;text-align:center}.momentum-model strong,.momentum-model span,.wave-model strong,.wave-model span{display:block}.momentum-model p,.wave-model p{margin-top:10px!important}.momentum-model>i,.wave-model>i{font-style:normal;font-weight:800;text-align:center;color:#1e6248}.longitudinal-wave{min-width:390px}.longitudinal-wave b,.longitudinal-wave i,.longitudinal-wave small,.longitudinal-wave em{display:block}.longitudinal-wave b,.longitudinal-wave i{font:800 22px/1.3 Manrope;letter-spacing:.12em}.longitudinal-wave i{color:#86958d}.longitudinal-wave small{margin:9px 0;color:#59675f}.longitudinal-wave em{font-style:normal;font-weight:800;color:#1e6248}@media(max-width:700px){.momentum-model,.wave-model{grid-template-columns:1fr;min-width:620px}.momentum-model>i,.wave-model>i{transform:rotate(90deg)}.longitudinal-wave{min-width:0}}