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i{position:absolute;bottom:12px;font-style:normal;font-size:9px}.hero-element-small{width:80px;height:86px;border-radius:18px;background:#f2d7c5;color:#8b6450}.hero-element-small b{font-size:34px}.hero-element-small span{top:8px;left:10px;font-size:9px}.hero-element-small small{font-size:6px}.hero-element-small.one{left:43px;top:46px;transform:rotate(-9deg)}.hero-element-small.two{right:22px;bottom:30px;background:#c7deeb;color:#446d78;transform:rotate(10deg)}.floating-dot{position:absolute;border-radius:50%;background:#efb58c;box-shadow:inset 2px 2px 4px #fff9,2px 4px 7px #765c3a2c}.dot-a{width:18px;height:18px;right:43px;top:59px}.dot-b{width:12px;height:12px;left:98px;bottom:41px;background:#cab9dc}.hero-note{position:absolute;right:6px;top:135px;font:14px Georgia,serif;color:#7d8c82;transform:rotate(8deg)}.hero-note b{color:#b07b59}.explorer{padding:54px max(4.5vw,24px) 48px;background:#fffdf9;border-top:1px solid #eee9e0;border-bottom:1px solid #ebe6dc}.section-heading{max-width:1280px;margin:0 auto 22px;display:flex;align-items:end;justify-content:space-between}.section-heading h2,.play-card h2,.more-elements h2{font:500 29px Georgia,serif;letter-spacing:-.4px;margin:0}.search-box{display:flex;align-items:center;gap:8px;width:250px;padding:9px 11px;background:#f7f4ee;border:1px solid #ebe6dc;border-radius:12px;color:#829087}.search-box span{font-size:20px}.search-box input{border:0;outline:0;background:transparent;flex:1;width:150px;font:12px 'Trebuchet MS',Arial,sans-serif;color:var(--ink)}.search-box kbd{font:10px monospace;background:white;padding:2px 5px;border-radius:4px}.toolbar{max-width:1280px;margin:0 auto 16px;display:flex;align-items:center;justify-content:space-between;gap:16px}.filters{display:flex;flex-wrap:wrap;gap:6px}.filter{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;background:#fff;border:1px solid #ece7dd;border-radius:999px;color:#728078;font:600 10px 'Trebuchet 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15px}.periodic-table{display:grid;grid-template-columns:repeat(18,minmax(48px,1fr));grid-template-rows:repeat(7,76px);gap:6px;min-width:980px}.element{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:12px;background:var(--tile,#ddd);color:#314c45;box-shadow:inset 1.5px 2px 4px #ffffffb8,inset -2px -3px 5px #5e69691c,0 3px 6px #35443e0d;transition:transform .16s,box-shadow .16s,opacity .2s;overflow:hidden}.element:hover,.element:focus{z-index:4;transform:scale(1.13);outline:2px solid #fff;box-shadow:inset 2px 3px 5px #ffffffd9,0 8px 16px #425a4c38}.element .atomic-number{position:absolute;top:5px;left:6px;font-size:8px;font-weight:700;opacity:.76}.element b{font:500 23px Georgia,serif;line-height:1}.element small{font-size:7px;font-weight:700;line-height:1.1;margin-top:4px;max-width:95%;text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.element 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0;display:flex;align-items:center;gap:18px;font-size:9px;color:#819087}.legend-foot>span{display:flex;align-items:center;gap:5px}.legend-hint{margin-left:auto!important}.dimmed{opacity:.15;filter:grayscale(.7)}.matched{box-shadow:0 0 0 2px #52796f,0 0 14px #52796f66!important;opacity:1}.color-block .element.block-s{--tile:#f2c8a8}.color-block .element.block-p{--tile:#c6d6ef}.color-block .element.block-d{--tile:#b9d9c5}.color-block .element.block-f{--tile:#dfbfdc}.play-section{max-width:1280px;margin:auto;padding:58px max(4.5vw,24px);display:grid;grid-template-columns:1.5fr 1fr;gap:20px}.play-card,.tip-card{background:#e5eee5;border-radius:24px;padding:24px;box-shadow:inset 2px 3px 8px #ffffffa6,0 8px 22px #485b4810}.play-card{display:grid;grid-template-columns:48px 1fr;gap:4px 16px;align-items:start}.play-icon{height:44px;width:44px;border-radius:15px;background:#f8f5eb;display:grid;place-items:center;font-size:22px;box-shadow:inset 2px 2px 5px #fff,0 3px 7px #52654f1c}.play-card p:not(.eyebrow){color:#718079;font-size:12px;line-height:1.7;max-width:600px;margin:10px 0 0}.text-link{grid-column:2;font-size:11px;font-weight:700;color:#507866;margin-top:7px}.text-link span{font-size:15px;margin-left:4px}.tip-card{background:#f6e5d5;display:flex;flex-direction:column;justify-content:center}.tip-card>span,.remember-card>span:first-child{font-size:9px;letter-spacing:1.4px;font-weight:700;color:#a57a59}.tip-card p{font:500 20px Georgia,serif;margin:12px 0;color:#715743}.tip-card small{font-size:10px;color:#967d68}footer{padding:18px max(4.5vw,24px);border-top:1px solid #e7e1d7;display:flex;justify-content:space-between;color:#88938b;font-size:10px}footer b{color:#d39a69}footer a{color:#5b776a}.peek{position:fixed;z-index:20;width:310px;display:flex;gap:12px;padding:14px;border-radius:17px;background:#fffdf8;border:1px solid #e9e4da;box-shadow:0 12px 32px #35443e27;opacity:0;pointer-events:none;transform:translateY(5px) scale(.97);transition:opacity .15s,transform .15s}.peek.visible{opacity:1;transform:translateY(0) scale(1)}.peek-number{width:35px;height:35px;border-radius:12px;background:#e3eee3;display:grid;place-items:center;color:#52796f;font-weight:700;font-size:12px;flex:none}.peek b{font:500 19px Georgia,serif}.peek b i{font-style:normal;color:#739083;margin-left:4px}.peek small{display:block;text-transform:capitalize;font-size:9px;color:#839087;margin-top:1px}.peek p{font-size:10px;line-height:1.45;color:#66766d;margin:7px 0}.peek-cta{font-size:9px;font-weight:700;color:#55796c}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:30}.detail-main{max-width:1140px;margin:auto;padding:34px 32px 80px}.back-link{font-size:12px;color:#74867c;font-weight:600}.element-hero{position:relative;display:grid;grid-template-columns:200px 1fr;gap:40px;align-items:center;padding:42px 20px 45px;overflow:hidden}.detail-tile{position:relative;width:180px;height:195px;border-radius:30px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#39594d;box-shadow:inset 4px 5px 13px #ffffffb8,inset -5px -6px 13px #59675821,9px 15px 24px #52615023}.detail-tile b{font:500 78px Georgia,serif;line-height:1}.detail-tile small{font-size:12px;letter-spacing:1px;font-weight:700;margin-top:6px}.detail-tile i{position:absolute;bottom:18px;font-size:11px;font-style:normal}.element-title h1{font-size:48px;margin-bottom:9px}.element-title h1 span{font:500 19px 'DM Sans';color:#7a8f83;vertical-align:middle;margin-left:12px}.element-title>p:not(.eyebrow){color:#74837a;max-width:520px;line-height:1.6;font-size:14px}.badge-row{display:flex;gap:7px;flex-wrap:wrap;margin:14px 0 22px}.badge-row span{font-size:10px;color:#65776d;background:#e8eee5;padding:7px 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em{font-size:9px;color:#829188;margin-left:auto;font-style:normal}.tiny-note{font-size:9px;color:#97a097;line-height:1.5;margin:12px 0 0}.pattern-card{background:#edf1e7}.pattern-card>p:not(.eyebrow){color:#748179;line-height:1.6;font-size:12px}.family-track{display:flex;align-items:center;gap:7px;margin-top:24px}.mini-element{width:65px;height:74px;border-radius:13px;background:var(--tile);display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:inset 2px 3px 5px #fff9,0 3px 6px #52615016}.mini-element small{font-size:8px;align-self:flex-start;margin-left:8px}.mini-element b{font:500 23px Fraunces}.mini-element span{font-size:7px;font-weight:700}.track-arrow{color:#94a398}.mindmap-section{padding-top:55px}.mindmap-section .section-heading>p{max-width:300px;color:#78867e;font-size:12px;line-height:1.6;margin:0}.mindmap{position:relative;max-width:100%;height:430px;margin-top:25px;background:#fbf9f3;border:1px solid #eee9df;border-radius:25px;overflow:hidden}.map-center{position:absolute;z-index:2;left:50%;top:50%;transform:translate(-50%,-50%);width:126px;height:126px;border-radius:50%;background:#d6e7d7;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:inset 3px 4px 8px #fff,0 8px 20px #64806c2a;color:#456d58}.map-center span{position:absolute;top:14px;left:24px;font-size:9px}.map-center b{font:500 43px Fraunces}.map-center small{font-size:9px;font-weight:700}.map-branch{position:absolute;z-index:2;width:245px;min-height:105px;padding:15px 16px 13px 48px;background:#fffdf8;border-radius:17px;box-shadow:inset 1px 2px 4px #fff,0 6px 15px #38463e14}.map-branch i{position:absolute;left:14px;top:14px;width:22px;height:22px;border-radius:8px;background:#f4e2d1;color:#a17857;display:grid;place-items:center;font-style:normal;font-size:9px;font-weight:700}.map-branch b{font:500 17px Fraunces;display:block;margin-bottom:4px}.map-branch span{display:block;font-size:10px;font-weight:700;color:#607b6a}.map-branch small{display:block;margin-top:5px;font-size:9px;line-height:1.35;color:#89948b}.branch-one{left:8%;top:9%}.branch-two{right:8%;top:9%}.branch-three{left:8%;bottom:9%}.branch-four{right:8%;bottom:9%}.map-lines{position:absolute;inset:0;width:100%;height:100%;z-index:1}.map-lines path{fill:none;stroke:#c8d6ca;stroke-width:2;stroke-dasharray:5 7}.remember-card{margin-top:18px;padding:18px 20px;border-radius:18px;background:#f7e8da;display:flex;align-items:center;gap:20px;flex-wrap:wrap}.remember-card p{font:500 15px Georgia,serif;color:#79634f;margin:0;flex:1}.remember-card .button{padding:10px 14px}.remember-msg{font-size:10px;color:#52796f}.more-elements{padding:55px 0 0}.friend-list{display:flex;gap:9px;margin-top:17px;flex-wrap:wrap}.friend{display:flex;align-items:center;gap:9px;padding:8px 13px 8px 8px;border-radius:12px;background:var(--tile);box-shadow:inset 1px 2px 4px #fff8,0 3px 8px #35443e0d}.friend b{font:500 20px Fraunces}.friend span{font-size:10px;font-weight:700}.friend small{font-size:8px;color:#6b7770}
@media(max-width:900px){.hero{padding-top:48px}.hero-art{transform:scale(.83);transform-origin:center right;margin-right:-35px}.filters{max-width:720px}.toolbar{align-items:flex-start}.color-select{padding-top:6px}.play-section{grid-template-columns:1fr}.detail-main{padding-left:22px;padding-right:22px}.branch-one,.branch-three{left:3%}.branch-two,.branch-four{right:3%}.map-branch{width:220px}}
@media(max-width:620px){.topbar{height:66px;padding:0 17px}.brand{font-size:16px}.brand-mark{height:32px;width:32px}.brand small{font-size:7px}.topbar nav{display:none}.sound-toggle{padding:8px 10px}.hero{padding:38px 22px 24px;min-height:auto;display:block}.hero h1{font-size:42px}.intro{font-size:13px}.hero-art{width:100%;height:245px;margin:14px auto 0;transform:scale(.78);transform-origin:top center}.hero-element-main{left:calc(50% - 68px);top:53px}.orbit-one{left:calc(50% - 195px);top:20px}.orbit-two{left:calc(50% - 155px);top:-7px}.hero-element-small.one{left:calc(50% - 145px);top:35px}.hero-element-small.two{right:calc(50% - 145px);bottom:25px}.hero-note{right:0;top:118px}.explorer{padding:38px 15px}.section-heading{display:block;margin-bottom:17px}.section-heading h2{font-size:25px}.search-box{margin-top:16px;width:100%}.toolbar{display:block}.filters{flex-wrap:nowrap;overflow-x:auto;padding-bottom:9px}.filter{white-space:nowrap}.color-select{display:block;padding:3px 0 8px}.periodic-table{grid-template-rows:repeat(7,67px);gap:5px}.element{border-radius:9px}.element b{font-size:19px}.element small{font-size:6px}.element i{font-size:5px}.fblock-wrap{gap:5px}.fblock-wrap .element{height:57px}.legend-foot{flex-wrap:wrap;gap:10px}.legend-hint{margin-left:0!important;width:100%}.play-section{padding:35px 16px}.play-card{padding:19px;grid-template-columns:38px 1fr;gap:5px 12px}.play-icon{width:38px;height:38px}.play-card h2{font-size:24px}.tip-card{padding:20px}.detail-main{padding:24px 16px 55px}.element-hero{grid-template-columns:105px 1fr;gap:18px;padding:28px 0 30px}.detail-tile{height:118px;width:105px;border-radius:22px}.detail-tile b{font-size:48px}.detail-tile>span{top:8px;left:10px;font-size:9px}.detail-tile small{font-size:8px}.detail-tile i{bottom:9px;font-size:8px}.element-title h1{font-size:33px}.element-title h1 span{font-size:15px;margin-left:4px}.element-title>p:not(.eyebrow){font-size:11px;line-height:1.45}.element-title .eyebrow{font-size:8px;letter-spacing:1px}.badge-row{gap:4px;margin:9px 0 13px}.badge-row span{font-size:8px;padding:6px 7px}.element-title .button{padding:9px 10px;font-size:9px}.orbit-mini{right:3%;top:2%;font-size:22px}.detail-grid{grid-template-columns:1fr}.info-card,.pattern-card{padding:19px}.facts-grid{grid-template-columns:repeat(2,1fr)}.facts-grid b{font-size:11px}.shell-note em{display:none}.family-track{gap:5px}.mini-element{width:58px;height:68px}.mindmap-section{padding-top:42px}.mindmap-section .section-heading{display:flex;align-items:end}.mindmap-section .section-heading h2{font-size:25px}.mindmap-section .section-heading>p{max-width:45%;font-size:10px}.mindmap{height:auto;min-height:600px;margin-top:17px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:24px 12px}.map-lines{display:none}.map-center{position:relative;left:auto;top:auto;transform:none;width:92px;height:92px;order:0;margin-bottom:5px}.map-center b{font-size:33px}.map-center span{top:9px;left:17px}.map-branch{position:relative;inset:auto!important;width:100%;max-width:350px;min-height:80px;padding:12px 12px 10px 44px}.map-branch b{font-size:15px}.map-branch small{font-size:9px}.remember-card{gap:10px;padding:15px}.remember-card p{min-width:100%;order:2}.remember-card .button{order:3}.remember-card>span:first-child{width:100%}.more-elements{padding-top:42px}footer{padding:16px;gap:10px;font-size:9px}.peek{width:min(310px,calc(100vw - 24px))}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
/* Larger, touch-friendly hover/focus preview */
.peek{width:min(360px,calc(100vw - 24px));gap:13px;padding:16px;border-radius:18px}
.peek-number{width:42px;height:42px;font-size:14px;border-radius:14px}
.peek b{font-size:22px}
.peek small{font-size:12px;line-height:1.4}
.peek p{font-size:13px;line-height:1.55;margin:9px 0}
.peek-cta{font-size:12px;display:inline-block;padding-top:2px}
@media(max-width:620px){
  .peek{width:min(340px,calc(100vw - 20px));padding:15px;gap:11px}
  .peek-number{width:38px;height:38px;font-size:13px}
  .peek b{font-size:20px}
  .peek small{font-size:11px}
  .peek p{font-size:12px;line-height:1.5}
  .peek-cta{font-size:11px}
}
/* Reading-first typography for element stories */
.detail-main{font-size:16px}
.back-link{font-size:14px}
.element-title>p:not(.eyebrow){font-size:16px;line-height:1.65}
.element-title .eyebrow,.info-card .eyebrow,.pattern-card .eyebrow,.mindmap-section .eyebrow,.more-elements .eyebrow{font-size:11px}
.info-card h2,.pattern-card h2{font-size:28px}
.facts-grid small{font-size:12px;line-height:1.4}
.facts-grid b{font-size:15px}
.shell-note b{font-size:14px}
.shell-note small{font-size:13px;line-height:1.45}
.shell-note em{font-size:12px}
.tiny-note{font-size:12px;line-height:1.55}
.pattern-card>p:not(.eyebrow){font-size:15px;line-height:1.65}
.mini-element small{font-size:10px}.mini-element span{font-size:9px}
.mindmap-section .section-heading>p{font-size:14px;line-height:1.6}
.map-branch b{font-size:19px}.map-branch span{font-size:13px;line-height:1.45}.map-branch small{font-size:12px;line-height:1.5}
.remember-card>span:first-child{font-size:11px}.remember-card p{font-size:18px}.remember-msg{font-size:12px}
.friend span{font-size:13px}.friend small{font-size:11px}
@media(max-width:620px){
 .detail-main{font-size:16px}
 .back-link{font-size:14px;display:inline-block;padding:8px 0}
 .element-hero{grid-template-columns:108px minmax(0,1fr);gap:16px;padding:26px 0 30px}
 .element-title h1{font-size:clamp(30px,8vw,37px);line-height:1.08}
 .element-title h1 span{font-size:16px}
 .element-title .eyebrow{font-size:10px;line-height:1.4}
 .element-title>p:not(.eyebrow){font-size:14px;line-height:1.55}
 .element-title .button{font-size:12px;padding:11px 12px}
 .badge-row span{font-size:11px;padding:7px 9px}
 .info-card h2,.pattern-card h2{font-size:27px}
 .facts-grid{gap:0 8px}
 .facts-grid>div{padding:14px 8px}
 .facts-grid small{font-size:12px;margin-bottom:7px}
 .facts-grid b{font-size:15px;line-height:1.45}
 .shell-note{gap:10px;padding:13px}
 .shell-note>span{font-size:24px}
 .shell-note b{font-size:14px}
 .shell-note small{font-size:13px;line-height:1.5}
 .shell-note em{font-size:11px;max-width:74px;text-align:right;line-height:1.35}
 .tiny-note{font-size:12px;line-height:1.6}
 .pattern-card>p:not(.eyebrow){font-size:14px}
 .family-track{gap:6px;flex-wrap:wrap}
 .mini-element{width:60px;height:72px}
 .mini-element b{font-size:25px}.mini-element small{font-size:10px}.mini-element span{font-size:9px}
 .mindmap-section .section-heading{display:block}
 .mindmap-section .section-heading>p{max-width:none;font-size:14px;margin-top:8px}
 .mindmap{gap:11px;padding:22px 14px;min-height:640px}
 .map-branch{padding:14px 13px 13px 47px;min-height:98px}
 .map-branch i{width:25px;height:25px;font-size:11px}
 .map-branch b{font-size:18px}
 .map-branch span{font-size:13px}
 .map-branch small{font-size:12px;line-height:1.5}
 .remember-card{gap:12px}
 .remember-card>span:first-child{font-size:11px}
 .remember-card p{font-size:17px;line-height:1.5}
 .remember-msg{font-size:12px}
 .friend{gap:8px;padding:9px 12px 9px 9px}
 .friend b{font-size:22px}.friend span{font-size:13px}.friend small{font-size:11px}
}
/* Study lab activities */
.study-lab{padding:64px max(4.5vw,24px) 72px;background:#f2eee5;border-bottom:1px solid #e7e1d7}.lab-heading{max-width:1280px;margin:0 auto 23px;display:flex;align-items:end;justify-content:space-between}.lab-heading h2{font:500 32px Georgia,serif;margin:0}.lab-heading>p{font-size:14px;color:#78867e;max-width:320px;line-height:1.55;margin:0 0 2px}.lab-grid{max-width:1280px;margin:auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.activity-card{background:#fffdf8;border-radius:22px;padding:23px;box-shadow:inset 2px 3px 6px #fff,0 8px 20px #4e473910;border:1px solid #eee9e0;min-width:0}.activity-kicker{font-size:10px;letter-spacing:1.1px;font-weight:700;color:#75877b;display:flex;align-items:center;gap:8px}.activity-kicker span{font-size:16px}.activity-card h3{font:500 24px Georgia,serif;margin:12px 0 7px}.activity-intro{font-size:13px;line-height:1.5;color:#7d8981;margin:0 0 17px}.quiz-box{padding:16px;border-radius:17px;background:#f5f1e9}.quiz-meta{display:flex;justify-content:space-between;color:#7e8b83;font-size:10px;font-weight:700;letter-spacing:.8px}.quiz-meta #dailyTimer{background:#fff;padding:5px 8px;border-radius:999px;letter-spacing:0}.quiz-clue{font:500 17px Georgia,serif;line-height:1.5;color:#40584c;margin:16px 0}.answer-options,.family-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.answer-option,.family-option{min-height:42px;border:1px solid #e6e3d9;background:#fffdf8;border-radius:11px;color:#4c6257;font:600 13px 'Trebuchet MS',Arial,sans-serif;cursor:pointer;padding:9px 11px;text-align:left}.answer-option:hover,.family-option:hover{border-color:#a6c2ac;background:#f1f7ef}.answer-option:disabled,.family-option:disabled{cursor:default;opacity:.75}.answer-option.correct,.family-option.correct{background:#e2f0df;border-color:#a9c9a5;color:#365b44}.answer-option.incorrect,.family-option.incorrect{background:#f8e6df;border-color:#e3b7a5;color:#8b5042}.quiz-box>.button{margin-top:12px}.activity-feedback{font-size:13px;line-height:1.5;color:#577a65;min-height:18px;margin:9px 0}.missed-box{border-top:1px solid #eee9e0;margin-top:15px;padding-top:13px}.missed-head,.saved-hooks-head{display:flex;justify-content:space-between;align-items:center;font-size:13px}.missed-head span,.saved-hooks-head span{font-size:11px;color:#87938a}.missed-list{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}.missed-item{display:flex;align-items:center;gap:6px;border-radius:999px;background:#f4e8dc;padding:6px 9px;color:#765b45;font-size:11px}.missed-item button{border:0;background:transparent;color:#52796f;font:700 10px 'Trebuchet MS';cursor:pointer}.atom-workbench{display:grid;grid-template-columns:1fr 1.1fr;gap:12px;align-items:center}.particle-tray{display:flex;flex-direction:column;gap:8px}.particle{display:grid;grid-template-columns:32px 1fr;grid-template-rows:auto auto;align-items:center;text-align:left;gap:1px 8px;border:1px solid #e9e6dc;border-radius:12px;padding:8px;background:#fbf9f3;cursor:grab;touch-action:manipulation}.particle:active{cursor:grabbing}.particle>b{grid-row:span 2;width:30px;height:30px;border-radius:10px;display:grid;place-items:center;background:#e9b2a0;color:#fff;font-size:18px}.particle.neutron>b{background:#a8cabb}.particle.electron>b{background:#b4c9eb}.particle span{font-weight:700;font-size:12px;color:#53665b}.particle small{font-size:9px;color:#90998f}.atom-drop{position:relative;height:165px;border:2px dashed #c4d3c6;border-radius:50%;display:grid;place-items:center;background:#f6f8f1;transition:.2s}.atom-drop.drop-active{background:#e5f1e3;border-color:#6f9879;transform:scale(1.03)}.atom-orbit{position:absolute;border:1px solid #c9d8ca;border-radius:50%;width:77%;height:48%;transform:rotate(-28deg)}.orbit-b{transform:rotate(48deg)}.atom-nucleus{position:relative;z-index:2;width:66px;height:66px;border-radius:50%;background:#edc4a9;box-shadow:inset 2px 3px 6px #fff9,0 4px 9px #a0744b25;display:grid;place-items:center;text-align:center;color:#765741;font-size:10px;font-weight:700;line-height:1.2;padding:5px}.orbit-electron{position:absolute;z-index:3;width:10px;height:10px;border-radius:50%;background:#9ab7e1;box-shadow:0 1px 4px #526c8b55}.e1{top:27px;right:25px}.e2{bottom:27px;left:25px}.atom-counts{grid-column:1/-1;display:flex;gap:8px;justify-content:center}.atom-counts span{background:#f3f0e9;padding:7px 10px;border-radius:9px;color:#718077;font-size:11px}.atom-counts b{color:#455d50;margin-left:3px}.atom-result{margin:12px 0;min-height:37px;padding:9px 11px;border-radius:11px;background:#edf3e9;color:#5a7562;font-size:12px;line-height:1.5}.atom-result b{font-size:14px;color:#3e6450}.atom-result a{font-weight:700;text-decoration:underline}.atom-card>.button{padding:9px 12px}.cousin-row{display:flex;gap:8px;margin:12px 0 15px}.cousin-tile{width:74px;height:77px;border-radius:13px;background:var(--tile);box-shadow:inset 1px 2px 4px #fff9,0 3px 8px #35443e0d;display:flex;flex-direction:column;align-items:center;justify-content:center}.cousin-tile small{font-size:9px}.cousin-tile b{font:500 27px Georgia,serif}.cousin-tile span{font-size:8px;font-weight:700;max-width:65px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.detective-question{font-size:14px;font-weight:700;color:#5a6f62;margin-bottom:9px}.family-option{text-align:center}.family-card>.button{padding:9px 12px}.memory-card{grid-column:1/-1}.memory-form{display:grid;grid-template-columns:1fr 1.5fr;gap:12px}.memory-form label{display:flex;flex-direction:column;gap:7px;color:#627368;font-size:12px;font-weight:700}.memory-form select,.memory-form textarea{width:100%;border:1px solid #e5e3d9;border-radius:11px;padding:11px;background:#fbfaf6;color:#42594c;font:13px 'Trebuchet MS',Arial,sans-serif;outline-color:#9dbea5}.memory-form select{min-height:43px}.memory-form textarea{resize:vertical;line-height:1.5}.sketch-label{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;color:#627368;font-size:12px;font-weight:700}.mini-button{border:0;background:transparent;color:#788a7c;font:600 11px 'Trebuchet MS';cursor:pointer;padding:5px}.memory-form canvas{grid-column:1/-1;width:100%;height:112px;border:1px dashed #bdcdbf;border-radius:12px;background:#fbfaf6;touch-action:none;cursor:crosshair}.memory-form>.button{justify-self:start}.memory-form .activity-feedback{align-self:center}.saved-hooks-head{border-top:1px solid #eee9e0;margin-top:18px;padding-top:14px}.saved-hooks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin-top:10px}.saved-hook{position:relative;background:#f4f1e8;border-radius:12px;padding:11px 35px 11px 12px;min-height:62px}.saved-hook b{display:block;font:500 15px Georgia,serif;color:#4b6657}.saved-hook p{font-size:11px;line-height:1.4;color:#7c887f;margin:5px 0 0;white-space:pre-wrap;overflow-wrap:anywhere}.saved-hook img{display:block;max-width:100%;max-height:90px;object-fit:contain;margin-top:8px;border-radius:7px}.delete-hook{position:absolute;right:7px;top:7px;width:24px;height:24px;border:0;border-radius:8px;background:#fff;color:#8c756b;cursor:pointer;font-size:14px}.activity-empty{font-size:11px;color:#9aa199;margin:8px 0}.activity-result{font-size:12px;color:#54785f;line-height:1.45}.activity-result a{font-weight:700;text-decoration:underline}
@media(max-width:900px){.lab-grid{grid-template-columns:1fr 1fr}.activity-card{padding:19px}.atom-workbench{grid-template-columns:.9fr 1.1fr}.lab-heading{gap:20px}}
@media(max-width:620px){.study-lab{padding:42px 15px 50px}.lab-heading{display:block;margin-bottom:18px}.lab-heading h2{font-size:28px}.lab-heading>p{font-size:14px;margin-top:9px}.lab-grid{grid-template-columns:1fr;gap:14px}.activity-card{padding:18px;border-radius:19px}.activity-kicker{font-size:10px}.activity-card h3{font-size:23px}.activity-intro{font-size:14px;line-height:1.55}.quiz-box{padding:13px}.quiz-clue{font-size:18px}.answer-options,.family-options{gap:7px}.answer-option,.family-option{font-size:14px;min-height:46px}.quiz-meta{font-size:11px}.activity-feedback{font-size:13px}.missed-head,.saved-hooks-head{font-size:14px}.missed-head span,.saved-hooks-head span{font-size:12px}.atom-workbench{grid-template-columns:.9fr 1.1fr;gap:8px}.atom-drop{height:150px}.particle{padding:7px 6px;gap:2px 6px}.particle span{font-size:12px}.particle small{font-size:9px}.atom-counts{gap:5px}.atom-counts span{padding:7px 8px}.atom-result{font-size:13px}.cousin-tile{width:68px;height:74px}.detective-question{font-size:14px}.memory-card{grid-column:auto}.memory-form{grid-template-columns:1fr;gap:11px}.memory-form label{font-size:13px}.memory-form select,.memory-form textarea{font-size:15px}.sketch-label{grid-column:auto;font-size:13px}.memory-form canvas{grid-column:auto;height:120px}.saved-hooks{grid-template-columns:1fr 1fr}.saved-hook{padding:11px 33px 11px 10px}.saved-hook b{font-size:15px}.saved-hook p{font-size:12px}.activity-card .button{font-size:13px}}
@media(max-width:390px){.atom-workbench{grid-template-columns:1fr}.particle-tray{display:grid;grid-template-columns:repeat(3,1fr)}.particle{grid-template-columns:1fr;justify-items:center;text-align:center}.particle>b{grid-row:auto}.particle span{font-size:11px}.particle small{font-size:8px}.atom-drop{width:min(100%,230px);justify-self:center}.saved-hooks{grid-template-columns:1fr}}
.missed-item{display:block;width:100%;border-radius:12px;padding:9px 11px;background:#f7f2ea;color:#735f4b}
.missed-item summary{cursor:pointer;font-size:12px;line-height:1.45;font-weight:600}
.missed-answer{font-size:12px;color:#526d5e;margin:10px 0 7px}
.missed-actions{display:flex;align-items:center;gap:12px;font-size:11px}
.missed-actions a{color:#52796f;font-weight:700}
.missed-actions button{border:0;border-radius:8px;padding:7px 9px;background:#e4eee2;color:#486d53;font:700 11px 'Trebuchet MS',Arial,sans-serif;cursor:pointer}
/* Lightweight object illustrations on element detail pages */
.object-section{margin:44px 0 8px;padding:26px;border:1px solid #eae6dc;border-radius:23px;background:#fffdf8;box-shadow:var(--shadow)}
.object-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:19px}
.object-heading h2{font:500 29px Georgia,serif;margin:0}
.object-heading>p{max-width:410px;margin:0;color:#77857b;font-size:14px;line-height:1.6}
.object-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}
.object-card{overflow:hidden;border:1px solid #ece8df;border-radius:16px;background:#fbfaf6;box-shadow:inset 1px 2px 4px #fff}
.object-art{position:relative;padding:8px 8px 0}
.object-art svg{width:100%;height:auto;display:block;filter:drop-shadow(0 4px 6px #53685a14)}
.object-art svg text{font-family:system-ui,'Apple Color Emoji','Segoe UI Emoji',sans-serif}
.object-form{position:absolute;left:16px;bottom:8px;padding:5px 8px;border-radius:999px;background:#ffffffed;color:#687d70;font-size:10px;font-weight:700;box-shadow:0 2px 5px #35443e12}
.object-copy{padding:9px 13px 14px}
.object-copy h3{font:500 17px Georgia,serif;margin:0 0 5px;color:#3f594a}
.object-copy p{margin:0;color:#78847c;font-size:12px;line-height:1.5}
.object-footnote{margin:14px 0 0;color:#929b92;font-size:11px;line-height:1.5}
@media(max-width:800px){.object-gallery{grid-template-columns:repeat(2,minmax(0,1fr))}.object-section{padding:21px}}
@media(max-width:620px){.object-section{margin:32px 0 4px;padding:17px;border-radius:19px}.object-heading{display:block;margin-bottom:14px}.object-heading h2{font-size:26px}.object-heading>p{font-size:14px;line-height:1.6;margin-top:8px}.object-gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.object-card{border-radius:13px}.object-art{padding:5px 5px 0}.object-form{left:10px;bottom:5px;font-size:9px;padding:4px 7px}.object-copy{padding:8px 10px 11px}.object-copy h3{font-size:15px;line-height:1.3}.object-copy p{font-size:12px;line-height:1.45}.object-footnote{font-size:11px;line-height:1.55;margin-top:11px}}
@media(max-width:360px){.object-gallery{grid-template-columns:1fr}.object-card{display:grid;grid-template-columns:43% 57%;align-items:center}.object-copy{padding:10px}}
/* Context card opened by a periodic-table family filter */
.family-info[hidden]{display:none!important}
.family-info{max-width:1280px;margin:0 auto 18px;padding:20px 22px;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:24px;align-items:center;background:#f1f5ee;border:1px solid #dfe9dc;border-radius:20px;box-shadow:inset 2px 3px 7px #fff,0 6px 16px #485b4810;animation:family-enter .22s ease-out both}
@keyframes family-enter{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}
.family-info-heading{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.family-info-heading .eyebrow{margin-bottom:4px;font-size:9px}
.family-info-heading h3{margin:0;font:500 23px Georgia,serif;color:#344f42}
.family-info-icon{width:38px;height:38px;border-radius:13px;background:#dcebdd;display:grid;place-items:center;color:#52796f;font-size:20px;box-shadow:inset 2px 2px 4px #fff}
.family-definition{max-width:650px;margin:0 0 13px;color:#5d7164;font-size:14px;line-height:1.6}
.family-features{font-size:13px;color:#506659}.family-features>b{font-size:13px}
.family-features ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px 20px;padding-left:18px;margin:9px 0 0;line-height:1.5}
.family-features li{padding-left:2px}
.family-features li::marker{color:#84a68a}
.family-note{margin:12px 0 0;padding:9px 12px;border-radius:11px;background:#fffdf8;color:#6c7d70;font-size:12px;line-height:1.45}
.family-safety{margin:10px 0 0;padding:9px 12px;border-radius:11px;background:#fff0df;color:#8e6345;font-size:12px;line-height:1.45}
.family-members{padding-left:20px;border-left:1px solid #dce6dc;min-width:0}
.family-members-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;color:#526b5b;font-size:13px}
.family-members-heading span{font-size:11px;color:#819086}
.family-member-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(76px,1fr));gap:6px;max-height:185px;overflow:auto;padding:2px 5px 4px 2px}
.family-member{min-width:0;min-height:60px;border-radius:10px;background:var(--tile);position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:inset 1px 2px 4px #fff9,0 2px 5px #34453c0c;transition:transform .14s}
.family-member:hover{transform:translateY(-2px)}
.family-member small{position:absolute;top:4px;left:6px;font-size:8px;color:#40584b}
.family-member b{font:500 22px Georgia,serif;line-height:1}
.family-member span{max-width:92%;font-size:9px;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;color:#40584b;margin-top:3px}
@media(max-width:900px){.family-info{grid-template-columns:1fr;gap:14px}.family-members{padding:13px 0 0;border-left:0;border-top:1px solid #dce6dc}.family-member-list{grid-template-columns:repeat(auto-fill,minmax(72px,1fr));max-height:165px}}
@media(max-width:620px){.family-info{margin:0 0 14px;padding:16px;border-radius:16px;gap:12px}.family-info-heading{gap:10px}.family-info-icon{width:34px;height:34px;border-radius:11px}.family-info-heading h3{font-size:21px}.family-info-heading .eyebrow{font-size:9px}.family-definition{font-size:14px;line-height:1.6;margin-bottom:11px}.family-features{font-size:13px}.family-features ul{grid-template-columns:1fr;gap:6px;margin-top:8px}.family-features li{line-height:1.5}.family-note,.family-safety{font-size:12px;line-height:1.5}.family-members-heading{font-size:13px}.family-member-list{grid-template-columns:repeat(auto-fill,minmax(68px,1fr));max-height:170px;gap:6px}.family-member{min-height:58px}.family-member b{font-size:21px}.family-member span{font-size:9px}}
.tip-card small b{color:#765c43;font-weight:700}.tip-card .symbol-sequence{display:block;margin-top:5px;color:#9d8771;font-size:10px}
/* Student-controlled memory trick carousel, placed beside Family Detective */
.memory-tricks-card{display:flex;flex-direction:column;min-height:100%}
.memory-tricks-card h3{margin-bottom:5px}
.trick-slide{flex:1;display:flex;flex-direction:column;padding:14px;border-radius:16px;background:#f7f3e9;border:1px solid #eee7db}
.trick-kind{font-size:9px;letter-spacing:1px;font-weight:700;color:#9b8064}
.trick-slide h4{font:500 20px Georgia,serif;color:#40594b;margin:9px 0 6px}
.trick-phrase{font:500 19px Georgia,serif;color:#755b43;line-height:1.4;margin:0 0 7px}
.trick-note{font-size:12px;line-height:1.5;color:#78857c;margin:0 0 12px}
.trick-elements{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
.trick-element{min-width:49px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:6px 7px;border-radius:10px;background:var(--tile,#e5eee5);box-shadow:inset 1px 2px 4px #fff9,0 2px 4px #35443e0d}
.trick-element b{font:500 17px Georgia,serif;color:#435c4d}
.trick-element span{font-size:8px;color:#607368;white-space:nowrap}
.trick-controls{display:flex;align-items:center;justify-content:space-between;margin-top:12px}
.trick-controls>button{width:35px;height:35px;border:1px solid #e7e4da;border-radius:11px;background:#fff;color:#587362;font-size:18px;cursor:pointer}
.trick-controls>button:disabled{opacity:.35;cursor:default}
.trick-dots{display:flex;align-items:center;gap:7px}
.trick-dot{width:8px;height:8px;border:0;border-radius:50%;padding:0;background:#cad5c9;cursor:pointer}
.trick-dot.current{width:20px;border-radius:999px;background:#6f9277}
.trail-card{padding:24px;border-radius:24px;background:#e7ede2;box-shadow:inset 2px 3px 8px #ffffffa6,0 8px 22px #485b4810;display:flex;flex-direction:column;justify-content:center}
.trail-card h2{font:500 25px Georgia,serif;margin:12px 0 7px;color:#3d5749}
.trail-card>p{font-size:12px;line-height:1.6;color:#738078;margin-bottom:14px}
.phone-trail{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}
.phone-trail a{display:grid;grid-template-columns:32px 1fr;grid-template-rows:auto auto;align-items:center;gap:1px 8px;padding:9px 10px;border-radius:12px;background:#fffdf8;box-shadow:inset 1px 2px 4px #fff,0 3px 7px #4557470e}
.phone-trail a>span{grid-row:span 2;width:30px;height:30px;border-radius:10px;background:#eef3e8;display:grid;place-items:center;font-size:16px}
.phone-trail b{font-size:11px;color:#4a6554}
.phone-trail small{font-size:9px;color:#839087}
.trail-link{margin-top:14px}
@media(max-width:620px){.memory-tricks-card{min-height:0}.trick-slide{padding:14px}.trick-slide h4{font-size:20px}.trick-phrase{font-size:19px}.trick-note{font-size:13px}.trick-element{min-width:51px}.trick-element b{font-size:18px}.trick-element span{font-size:9px}.trail-card{padding:20px}.trail-card h2{font-size:24px}.trail-card>p{font-size:14px}.phone-trail a{padding:10px}.phone-trail b{font-size:12px}.phone-trail small{font-size:10px}}
/* Full library of 100 element memory hooks */
.tricks-page{max-width:1120px;margin:0 auto;padding:28px 30px 72px}
.tricks-hero{max-width:740px;padding:30px 0 28px}
.tricks-hero h1{font:500 46px/1.05 Georgia,serif;letter-spacing:-.9px;margin:0 0 12px}
.tricks-hero h1 em{font-weight:500;color:#6e9885}
.tricks-hero>p:last-child{max-width:650px;color:#738178;font-size:16px;line-height:1.65;margin:0}
.trick-player-wrap{scroll-margin-top:18px}
.trick-library-tools{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.trick-search{flex:1;max-width:440px;display:flex;align-items:center;gap:9px;padding:10px 13px;border:1px solid #e7e2d8;background:#fffdf8;border-radius:12px;color:#859188;font-size:20px}
.trick-search input{width:100%;border:0;outline:0;background:transparent;color:#344b40;font:14px 'Trebuchet MS',Arial,sans-serif}
.trick-filter-label{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:700;color:#7b8980}
.trick-filter-label select{padding:10px;border:1px solid #e7e2d8;border-radius:11px;background:#fffdf8;color:#4f6758;font:13px 'Trebuchet MS',Arial,sans-serif}
.trick-library-tools>.button{margin-left:auto}
.trick-player{display:grid;grid-template-columns:minmax(220px,.8fr) minmax(0,1.2fr);gap:26px;align-items:center;padding:25px;border-radius:24px;background:#fffdf8;border:1px solid #ebe6dd;box-shadow:var(--shadow)}
.trick-player-image{min-width:0}
.trick-player-image svg{width:100%;height:auto;display:block;filter:drop-shadow(0 7px 12px #40534418)}
.trick-player-copy{padding:8px 4px}
.trick-kind{font-size:10px;letter-spacing:1.2px;font-weight:700;color:#8b958c}
.trick-player-copy h2{font:500 28px/1.2 Georgia,serif;color:#354f42;margin:12px 0 8px}
.trick-player-copy h2 em{font-style:normal;color:#8e6c4f}
.hook-prompt{font-size:14px;color:#78857c;line-height:1.55;margin:0 0 17px}
.hook-answer{margin-top:17px;padding:15px 16px;border-radius:15px;background:#f2f5ec;border:1px solid #e4ebdf;display:block}
.hook-answer[hidden]{display:none!important}
.hook-answer-name{display:flex;align-items:center;gap:10px}
.hook-atomic-number{width:32px;height:32px;border-radius:10px;background:#dceadd;display:grid;place-items:center;color:#52796f;font-size:11px;font-weight:700}
.hook-answer-name b{font:500 24px Georgia,serif;color:#405c4b}
.hook-answer-name strong{font:500 22px Georgia,serif;color:#7f9a85}
.hook-memory-line{margin:11px 0 4px;color:#5d715f;font:500 15px Georgia,serif;line-height:1.5}
.hook-explanation{font-size:13px;line-height:1.55;color:#76837a;margin:7px 0 9px}
.hook-form{display:inline-block;border-radius:999px;background:#fffdf8;padding:5px 9px;font-size:10px;font-weight:700;color:#7b897e}
.hook-story-link{display:block;margin-top:12px;color:#52796f;font-size:12px;font-weight:700}
.trick-player-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 3px 24px}
.trick-count{font-size:12px;font-weight:700;color:#7c8980}
.trick-player-controls .button{min-width:124px;justify-content:center}
.trick-player-controls .button:disabled{opacity:.45;cursor:default;transform:none}
.trick-library{padding-top:28px;border-top:1px solid #e7e1d7}
.trick-library-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:16px}
.trick-library-heading h2{font:500 28px Georgia,serif;margin:0}
.trick-library-heading>span{font-size:12px;color:#839087}
.trick-library-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}
.trick-library-tile{position:relative;min-width:0;min-height:98px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:3px;padding:12px 10px 10px 47px;border:1px solid #eae6dc;border-radius:14px;background:#fffdf8;box-shadow:inset 1px 2px 4px #fff,0 3px 8px #4c51410a;text-align:left;color:#41594a;cursor:pointer;transition:transform .15s,box-shadow .15s}
.trick-library-tile:hover{transform:translateY(-2px);box-shadow:0 7px 14px #425a4c18}
.trick-library-tile .library-index{position:absolute;top:8px;right:9px;font-size:9px;color:#9ba39a}
.trick-library-tile .library-emoji{position:absolute;left:9px;top:50%;transform:translateY(-50%);width:31px;height:31px;border-radius:10px;background:#eef3e8;display:grid;place-items:center;font-size:17px}
.trick-library-tile b{font:500 14px Georgia,serif;line-height:1.2}
.trick-library-tile small{font-size:9px;line-height:1.3;color:#819087}
.no-tricks{padding:20px;color:#718078;font-size:14px}
.trick-library-link{display:block;margin:10px auto 0;color:#52796f;font-size:11px;font-weight:700;text-align:center}
.trick-library-link span{font-size:14px;margin-left:3px}
@media(max-width:900px){.trick-library-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.trick-player{gap:18px}}
@media(max-width:620px){.tricks-page{padding:21px 16px 52px}.tricks-hero{padding:24px 0 22px}.tricks-hero h1{font-size:38px}.tricks-hero>p:last-child{font-size:15px}.trick-library-tools{display:grid;grid-template-columns:1fr auto}.trick-search{grid-column:1/-1;max-width:none}.trick-filter-label{font-size:12px}.trick-filter-label select{min-width:0;max-width:180px}.trick-library-tools>.button{margin:0;justify-self:end}.trick-player{grid-template-columns:1fr;gap:13px;padding:16px;border-radius:20px}.trick-player-image{max-width:280px;width:100%;justify-self:center}.trick-player-copy{padding:0}.trick-player-copy h2{font-size:25px;margin:10px 0 7px}.hook-prompt{font-size:14px}.hook-answer{padding:13px}.hook-memory-line{font-size:15px}.hook-explanation{font-size:13px}.trick-player-controls{gap:8px;padding:12px 0 21px}.trick-player-controls .button{min-width:0;padding:10px 12px;font-size:12px}.trick-count{font-size:11px;text-align:center}.trick-library-heading h2{font-size:25px}.trick-library-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.trick-library-tile{min-height:78px;padding:10px 8px 9px 43px;border-radius:12px}.trick-library-tile .library-emoji{left:7px;width:28px;height:28px;font-size:16px}.trick-library-tile b{font-size:14px}.trick-library-tile small{font-size:9px}.trick-library-link{font-size:12px}}
@media(max-width:370px){.trick-player-controls .button{padding:9px;font-size:11px}.trick-library-grid{grid-template-columns:1fr}}