.ce-standalone{--ink:#392f29;--muted:#776b60;--paper:#fffdf8;--wash:#f1e8dc;--line:#ddd1c2;--lav:#775c45;margin:0;background:#f6f0e6;color:var(--ink);font-family:Inter,system-ui,-apple-system,sans-serif;min-height:100vh}.ce-standalone.ce-dark{--ink:#eee4d5;--muted:#bcad9a;--paper:#302820;--wash:#3c3228;--line:#594b3c;--lav:#dec5a4;background:#201c18}.ce-sitebar{max-width:1440px;margin:auto;padding:26px 40px;display:flex;align-items:center;gap:24px;border-bottom:1px solid var(--line)}.ce-sitebar a{font-family:Georgia,serif;font-size:27px;text-decoration:none;color:inherit}.ce-sitebar span{margin-left:auto;font-size:12px;color:var(--muted)}.ce-sitebar button{background:var(--paper);border:1px solid var(--line);border-radius:50%;width:38px;height:38px;color:inherit;cursor:pointer}.ce-standalone #cellEngineeringRoot{padding:30px 40px 70px}
#cellEngineeringRoot{--ce-paper:var(--theme-surface,var(--paper,#fffdf8));--ce-wash:var(--theme-raised,var(--wash,#f1e8dc));--ce-line:var(--theme-edge,var(--line,#ddd1c2));--ce-accent:var(--lav,#775c45);max-width:1440px;margin:auto;color:var(--ink,#392f29);line-height:1.65;font-size:15px;overflow-wrap:anywhere}#cellEngineeringRoot *{box-sizing:border-box}#cellEngineeringRoot button,#cellEngineeringRoot input,#cellEngineeringRoot select,#cellEngineeringRoot textarea{font:inherit;color:inherit}#cellEngineeringRoot button{cursor:pointer;transition:background .15s}#cellEngineeringRoot button:disabled{cursor:default;opacity:.5}#cellEngineeringRoot :focus-visible{outline:3px solid var(--ce-accent);outline-offset:3px}#cellEngineeringRoot h1{font-family:Georgia,serif;font-size:clamp(34px,4.3vw,62px);font-weight:500;letter-spacing:-1.8px;line-height:1.08;margin:12px 0 20px}#cellEngineeringRoot h2{font-size:25px;line-height:1.3;letter-spacing:-.5px;margin:0 0 12px}#cellEngineeringRoot h3{font-size:18px;line-height:1.4;letter-spacing:0;margin:0 0 12px}#cellEngineeringRoot p{margin:0 0 14px}#cellEngineeringRoot a{color:var(--ce-accent);text-underline-offset:3px}#cellEngineeringRoot small,.ce-muted{color:var(--muted,#776b60)}.ce-eyebrow{color:var(--ce-accent);letter-spacing:.14em;text-transform:uppercase;font-size:11px;font-weight:800}.ce-hero{display:grid;grid-template-columns:1fr 300px;gap:50px;padding:38px;background:var(--ce-paper);border:1px solid var(--ce-line);border-radius:24px;position:relative;overflow:hidden}.ce-hero p{max-width:660px;color:var(--muted)}.ce-hero em{color:var(--ce-accent);font-weight:400}.ce-orbit{position:relative;display:grid;place-items:center;min-height:210px}.ce-orbit:before,.ce-orbit:after{content:'';position:absolute;border:1px solid var(--ce-line);border-radius:50%;width:220px;height:220px}.ce-orbit:after{width:155px;height:155px}.ce-orbit b{font:italic 44px Georgia,serif;color:var(--ce-accent);z-index:1}.ce-orbit span{position:absolute;z-index:2;padding:6px 14px;background:var(--ce-wash);border:1px solid var(--ce-line);border-radius:20px;font-size:12px}.ce-orbit span:nth-child(2){top:15px;left:0}.ce-orbit span:nth-child(3){right:0;top:90px}.ce-orbit span:nth-child(4){left:35px;bottom:5px}.ce-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.ce-button{padding:10px 16px;border:1px solid var(--ce-line);border-radius:10px;background:var(--ce-paper);color:var(--ink);min-height:44px}.ce-button:hover{background:var(--ce-wash)}.ce-button.primary{background:var(--ce-accent);border-color:var(--ce-accent);color:var(--ce-paper)}.ce-button[aria-pressed=true]{background:var(--ce-wash);border-color:var(--ce-accent)}.ce-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}.ce-stat{border:1px solid var(--ce-line);border-radius:14px;padding:16px 20px;background:var(--ce-paper)}.ce-stat b{display:block;font-size:24px;line-height:1.3}.ce-stat span{font-size:12px;color:var(--muted)}.ce-nav{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0 28px;align-items:center}.ce-nav button{border:0;border-radius:9px;padding:10px 14px;background:transparent;color:var(--muted);font-weight:600;min-height:44px}.ce-nav button[aria-current=page]{color:var(--ink);background:var(--ce-wash)}.ce-panel{padding:26px;border:1px solid var(--ce-line);border-radius:18px;background:var(--ce-paper);margin:0 0 20px;min-width:0}.ce-note{padding:18px 22px;border-left:3px solid var(--ce-accent);background:var(--ce-wash);border-radius:0 12px 12px 0;margin:20px 0}.ce-note p:last-child{margin-bottom:0}.ce-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.ce-module{text-align:left;background:var(--ce-paper);border:1px solid var(--ce-line);border-radius:18px;padding:25px;color:inherit;min-height:230px;display:flex;flex-direction:column;align-items:flex-start}.ce-module:hover{background:var(--ce-wash);border-color:var(--ce-accent)}.ce-module .ce-eyebrow{margin-bottom:18px}.ce-module h3{font:500 25px/1.15 Georgia,serif;letter-spacing:-.4px}.ce-module p{color:var(--muted);font-size:13px}.ce-module small{margin-top:auto}.ce-module progress{width:100%;height:5px;margin-top:14px;accent-color:var(--ce-accent)}.ce-columns{display:grid;grid-template-columns:300px minmax(0,1fr);gap:22px;align-items:start}.ce-topic-list{display:grid;gap:8px;max-height:720px;overflow-y:auto}.ce-topic-list button{text-align:left;border:1px solid var(--ce-line);border-radius:10px;padding:12px;background:var(--ce-paper)}.ce-topic-list button.active{border-color:var(--ce-accent);background:var(--ce-wash)}.ce-topic-list small{display:block;font-size:11px}.ce-topic-list b{font-size:14px;font-weight:600}.ce-filters{display:flex;gap:12px;flex-wrap:wrap;align-items:end;margin-bottom:20px}.ce-filters label{font-size:12px;display:grid;gap:5px;flex:1;min-width:160px}.ce-filters input,.ce-filters select,.ce-select{border:1px solid var(--ce-line);background:var(--ce-paper);border-radius:10px;padding:10px;width:100%;min-height:44px}.ce-prompt{font:italic 23px/1.45 Georgia,serif;margin:20px 0!important;color:var(--ce-accent)}.ce-badge{display:inline-block;background:var(--ce-wash);border:1px solid var(--ce-line);border-radius:999px;padding:3px 10px;font-size:11px;margin:0 5px 5px 0}.ce-checkpoints{padding-left:22px}.ce-checkpoints li{padding:5px 0 10px}.ce-links{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.ce-links button{background:transparent;border:1px solid var(--ce-line);border-radius:8px;padding:6px 10px;font-size:12px;color:var(--ce-accent);text-align:left}.ce-draft{display:grid;gap:7px;font-weight:600;font-size:13px}.ce-draft textarea{width:100%;min-height:150px;border:1px solid var(--ce-line);border-radius:12px;padding:15px;background:var(--ce-paper);font-weight:400;line-height:1.65;resize:vertical}.ce-draft small{font-weight:400}.ce-rating{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.ce-rating button{padding:9px 14px;min-height:44px;background:var(--ce-paper);border:1px solid var(--ce-line);border-radius:10px}.ce-rating button.active{background:var(--ce-wash);border-color:var(--ce-accent)}.ce-disclosure{border-top:1px solid var(--ce-line);padding:18px 0;margin-top:18px}.ce-disclosure summary{cursor:pointer;font-weight:700}.ce-disclosure .ce-checkpoints{margin-top:18px}.ce-tablewrap{overflow-x:auto}.ce-table{width:100%;border-collapse:collapse;font-size:14px}.ce-table th{text-align:left;background:var(--ce-wash)}.ce-table td,.ce-table th{padding:13px;border-bottom:1px solid var(--ce-line);vertical-align:top}.ce-table tr:last-child td{border:0}.ce-source img{display:block;width:100%;height:auto;border:1px solid var(--ce-line);border-radius:8px;margin:15px 0}.ce-source figcaption{font-size:12px;color:var(--muted)}.ce-source figure{margin:0}.ce-source pre{white-space:pre-wrap;word-break:break-word;font:13px/1.65 system-ui;padding:16px;background:var(--ce-wash);border-radius:10px;max-height:400px;overflow:auto}.ce-timer{margin-left:auto;font-variant-numeric:tabular-nums;font-weight:700;color:var(--ce-accent)}.ce-exam-head{display:flex;gap:15px;align-items:center;flex-wrap:wrap;border-bottom:1px solid var(--ce-line);padding-bottom:20px;margin-bottom:20px}.ce-rubric{display:grid;gap:10px;margin:20px 0}.ce-rubric label{display:flex;gap:12px;align-items:start;padding:12px;border:1px solid var(--ce-line);border-radius:9px}.ce-rubric input{margin-top:5px;min-width:20px;min-height:20px;accent-color:var(--ce-accent)}.ce-flash{min-height:280px;display:grid;align-content:center;background:var(--ce-wash);padding:35px;border-radius:18px;margin:20px 0}.ce-score{font-size:40px;font-family:Georgia,serif;color:var(--ce-accent)}.ce-foot{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;margin:30px 0;font-size:12px;color:var(--muted)}.ce-loading{padding:30px}.ce-empty{padding:35px;text-align:center}.ce-status{font-size:12px;color:var(--muted);min-height:20px}.ce-guide-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;padding:16px 0;border-bottom:1px solid var(--ce-line)}.ce-guide-row small{display:block}.ce-guide-row h3{margin-bottom:4px}.ce-print{display:none}
@media(max-width:1050px){.ce-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ce-hero{grid-template-columns:1fr 230px;gap:20px}.ce-columns{grid-template-columns:250px minmax(0,1fr)}}@media(max-width:700px){.ce-standalone #cellEngineeringRoot{padding:20px 16px 50px}.ce-sitebar{padding:18px}.ce-sitebar span{display:none}.ce-sitebar button{margin-left:auto}.ce-hero{grid-template-columns:1fr;padding:25px;gap:0}.ce-orbit{display:none}.ce-stats{grid-template-columns:repeat(2,1fr)}.ce-grid,.ce-columns{grid-template-columns:1fr}.ce-topic-list{max-height:240px}.ce-panel{padding:20px}.ce-module{min-height:190px}.ce-nav{gap:4px}.ce-nav button{padding:9px 11px;font-size:13px}.ce-guide-row{grid-template-columns:1fr}.ce-filters label{min-width:100%}.ce-timer{margin-left:0}}
@media print{.ce-sitebar,.sidebar,.ambient,.topbar,.music-dock,.ce-nav,.ce-hero,.ce-stats,.ce-filters,.ce-actions,.ce-rating,.ce-links,.ce-foot,.ce-topic-list,.ce-status{display:none!important}body,.ce-standalone{background:white!important;color:black!important}.ce-standalone #cellEngineeringRoot{padding:0}.ce-panel{break-inside:avoid;border:0;padding:0;margin-bottom:25px}.ce-columns{display:block}.ce-print{display:block}.ce-draft{display:none}.ce-note{background:none;border-color:#999}.ce-checkpoints li{padding:3px 0}#cellEngineeringRoot h2{font-size:20px}#cellEngineeringRoot h3{font-size:17px}.ce-module{min-height:0}}
/* Guided teaching: explanatory content precedes optional retrieval. */
.ce-study-tracks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.ce-study-tracks .ce-panel{display:flex;flex-direction:column}.ce-study-tracks .ce-actions{margin-top:auto!important;padding-top:14px}.ce-reading-progress{width:100%;height:8px;accent-color:var(--ce-accent)}.ce-lesson-position{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:16px}.ce-lesson-opening{font:400 22px/1.65 Georgia,serif;max-width:75ch;color:var(--ce-accent);margin:20px 0 28px!important}.ce-lesson-section{margin:30px 0;max-width:80ch}.ce-lesson-section p{line-height:1.85}.ce-worked-example,.ce-takeaway{background:var(--ce-wash);padding:24px;border-radius:14px;margin:26px 0}.ce-worked-example h3{margin-top:9px!important}.ce-worked-example p:last-child,.ce-takeaway p:last-child{margin:0!important}.ce-takeaway{border:1px solid var(--ce-line);background:var(--ce-paper)}.ce-figure-explanation{padding:16px 0;line-height:1.8}.ce-lesson-controls{padding:20px 0;border-top:1px solid var(--ce-line)}.ce-lesson-controls .ce-button{max-width:100%;text-align:left}.ce-topic-list{position:sticky;top:20px}.ce-topic-list button.active{border-left:4px solid var(--ce-accent)}
@media(max-width:1050px){.ce-study-tracks{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.ce-study-tracks{grid-template-columns:1fr}.ce-topic-list{position:static}.ce-lesson-opening{font-size:20px}.ce-lesson-controls{align-items:stretch;flex-direction:column}.ce-worked-example,.ce-takeaway{padding:18px}}
@media print{.ce-lesson-controls,.ce-reading-progress{display:none!important}.ce-topic-list{position:static}.ce-study-tracks{display:block}.ce-worked-example,.ce-takeaway{background:none;border:1px solid #aaa}.ce-lesson-section{max-width:none}}
.ce-video-chapters{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.ce-video-chapters .ce-button{font-size:12px;padding:8px 12px}#ceWatch video{display:block;aspect-ratio:16/9;margin:20px 0}.ce-video-chapters .ce-button:focus-visible{outline-offset:2px}@media print{#ceWatch{display:none!important}}

#ceWatch video{aspect-ratio:8/5}
.ce-film-board{margin:22px 0}.ce-film-board img{display:block;width:100%;height:auto;border:1px solid var(--ce-line);border-radius:12px}.ce-film-board figcaption,.ce-film-builds figcaption{font-size:12px;color:var(--muted);margin-top:8px}.ce-film-builds{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:20px}.ce-film-builds figure{margin:0}.ce-film-builds img{width:100%;height:auto;border:1px solid var(--ce-line);border-radius:8px}.ce-film-segment{padding:24px 0;border-bottom:1px solid var(--ce-line)}.ce-film-segment p{margin-top:12px!important;font-size:16px;line-height:1.85}@media(max-width:700px){.ce-film-builds{grid-template-columns:1fr}}
#ceFullMidtermVideo{display:block;width:100%;aspect-ratio:8/5;background:#392f29;border-radius:14px;margin:20px 0}.ce-film-segment:first-child{padding-top:12px}
.ce-oq-options{border:0;padding:0;margin:18px 0}.ce-oq-options label{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--ce-border,#bda584);border-radius:12px;padding:15px;margin:10px 0;cursor:pointer}.ce-oq-options input{margin-top:4px;flex-shrink:0}.ce-oq-correct{outline:2px solid #50816a}.ce-oq-match{display:grid;gap:8px;margin:16px 0}.ce-oq-match select{width:100%;padding:12px;max-width:100%;white-space:normal}.ce-oq-nav{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}.ce-oq-nav button{min-width:40px;min-height:40px;border-radius:8px;border:1px solid #bda584;background:transparent;color:inherit;cursor:pointer}.ce-oq-nav button[aria-current=true]{outline:2px solid #956443;font-weight:bold}.ce-panel progress{width:100%;height:12px;accent-color:#956443}.ce-button:disabled{opacity:.5;cursor:default}
#ceShortMidtermVideo{display:block;width:100%;max-height:75vh;background:#302d29;border-radius:14px;margin:20px 0}
.ce-simple-diagram{margin:18px 0}.ce-simple-diagram img{display:block;width:100%;height:auto;border-radius:14px;background:#fffdf7}.ce-simple-facts{padding:18px 22px;border-radius:14px;background:var(--ce-wash,#f4eadc);margin-bottom:22px}.ce-simple-facts h3{margin-top:0}.ce-simple-facts li{font-size:1.06rem;line-height:1.65;margin:12px 0;padding-left:5px}
/* Opaque navigation surfaces keep labels legible over the wood texture. */
#cellEngineeringRoot .ce-nav{background:#f2e7d5;border:1px solid #b6a188;border-radius:16px;padding:10px}
#cellEngineeringRoot .ce-nav button{background:#fff9ed;color:#3a2e22;border:1px solid #b6a188;opacity:1}
#cellEngineeringRoot .ce-nav button:hover{background:#ead8bb;color:#3a2e22}
#cellEngineeringRoot .ce-nav button[aria-current="page"]{background:#604832;color:#fff9ed;border-color:#604832;font-weight:700}
#cellEngineeringRoot .ce-nav button[aria-current="page"]:hover{background:#493622;color:#fff9ed}
#cellEngineeringRoot .ce-nav button:focus-visible{outline:3px solid #3a2e22;outline-offset:3px}