.epi-wrap{max-width:1200px;margin:auto;padding-left:7%;padding-right:7%}.epi-hero{background:#244d3f;color:#f8f9eb;padding:45px 0 80px}.epi-back{display:inline-block;color:#c6d8c9;font-size:12px;font-weight:bold;margin-bottom:60px}.epi-hero h1{margin:24px 0}.epi-hero h1 em,.epi-x h2 em{color:#b5d38f}.epi-hero p{max-width:580px;color:#c6d8c9;font-size:17px;line-height:1.75}.epi-start{display:inline-block;margin-top:30px;background:#d9eb8d;color:#17372e;border-radius:40px;padding:15px 22px;font-size:13px;font-weight:bold}.epi-section{padding-top:90px;padding-bottom:90px}.epi-heading{display:flex;justify-content:space-between;align-items:end;gap:35px;margin-bottom:40px}.epi-heading>p{max-width:350px;line-height:1.7;color:#61746a}.model{display:grid;grid-template-columns:1.15fr 1fr;background:white;border:1px solid #d9e0d2}.model-visual{background:#e5efd2;padding:30px;min-height:320px}.model-label,.epi-kicker{font-size:10px;font-weight:bold;letter-spacing:1.5px;color:#698a70}.dna-line{display:flex;align-items:stretch;margin-top:75px}.promoter,.gene{position:relative;background:#8db697;color:#17372e;padding:19px 20px;text-align:center;border:2px solid #699a78}.promoter{width:45%}.gene{width:55%;background:#c0d8a5}.methyl{display:none;position:absolute;bottom:100%;left:0;right:0;color:#aa644f;font-weight:bold;font-size:14px;padding-bottom:9px}.model.is-methylated .methyl{display:block}.model.is-methylated .promoter{background:#deb89a}.model-arrow{text-align:center;margin:20px 0 10px;color:#5a8068;font-size:13px}.model-product{text-align:center;font-weight:bold}.model-controls{padding:35px}.model-controls h3,.concept-grid h3{font:28px Georgia,serif;margin:15px 0}.model-controls p,.concept-grid p,.callout p{color:#61746a;line-height:1.75;font-size:14px}.toggle-group{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0}.toggle-group button,.x-options button,.quiz-option{border:1px solid #b7cbb8;background:#fff;color:#17372e;padding:12px 15px;cursor:pointer;font:inherit}.toggle-group button[aria-pressed=true]{background:#185a43;color:white;border-color:#185a43}.model-explanation{padding:16px;background:#f0f5e8;font-size:14px;line-height:1.6}.model-note,.x-note,.source-note{font-size:12px;line-height:1.7;color:#61746a;margin-top:20px}.concept-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:35px}.concept-grid article{background:#fff;border:1px solid #d9e0d2;padding:30px}.concept-grid article>span{font:32px Georgia,serif;color:#87a871}.callout{background:#e9eddb;padding:25px;margin-top:24px;display:flex;gap:28px}.callout strong{white-space:nowrap}.epi-x{background:#244d3f;color:#f8f9eb;padding:90px 0}.epi-x .epi-heading>p,.x-note{color:#c6d8c9}.x-lab{display:grid;grid-template-columns:1fr 1fr;gap:30px;background:#f8f9ef;color:#17372e;padding:30px}.x-options{display:flex;gap:12px}.x-options button{flex:1;text-align:center}.x-options button span{display:block;font:bold 48px Georgia,serif;color:#7ea883}.x-options button[aria-pressed=true]{background:#e0ead2;border-color:#648c6e}.x-lab p{color:#61746a;line-height:1.6;margin-top:10px}.quiz-lead{margin-top:20px;color:#61746a}.question{border-top:1px solid #d9e0d2;padding:28px 0}.question:first-child{margin-top:30px}.question h3{font:23px Georgia,serif;margin-bottom:18px}.quiz-options{display:flex;flex-wrap:wrap;gap:8px}.quiz-option[aria-pressed=true]{background:#e0ead2;border-color:#648c6e}.quiz-feedback{font-size:14px;line-height:1.6;margin-top:14px}.source-note a{text-decoration:underline}.tool-entry{margin-top:50px;padding:32px;background:#e9eddb}.tool-entry h2{font-size:36px;margin:15px 0}.tool-entry p{max-width:600px;line-height:1.7;color:#61746a}.tool-entry a{display:inline-block;margin-top:20px}.toggle-group button:focus-visible,.x-options button:focus-visible,.quiz-option:focus-visible{outline:3px solid #17372e;outline-offset:2px}@media(max-width:700px){.epi-heading{display:block}.epi-heading>p{margin-top:20px}.model,.concept-grid,.x-lab{grid-template-columns:1fr}.epi-section,.epi-x{padding-top:65px;padding-bottom:65px}.model-controls{padding:25px}.x-options{flex-wrap:wrap}}
.tool-entry{padding:clamp(32px,5vw,64px)}.tool-entry h2{line-height:1.15;margin:24px 0 18px}.tool-entry p{line-height:1.8}.tool-entry a{margin-top:30px}
.epi-deep{border-top:1px solid #d9e0d2}.deep-intro{max-width:820px;color:#61746a;line-height:1.8;margin-top:24px}.replication{background:#e5efd2;padding:clamp(24px,4vw,40px)}.replication-steps{display:flex;flex-wrap:wrap;gap:8px}.replication-steps button{border:1px solid #9bb69d;background:#f8f9ef;color:#17372e;padding:12px 16px;cursor:pointer;font:inherit}.replication-steps button[aria-pressed="true"]{background:#185a43;color:white;border-color:#185a43}.replication-steps button:focus-visible{outline:3px solid #17372e;outline-offset:2px}.replication-view{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;margin-top:35px}.replication-view h3{font:28px Georgia,serif;margin:12px 0}.replication-view p{font-size:14px;line-height:1.7;color:#61746a}.rep-diagram{display:grid;gap:8px}.rep-diagram span{display:block;border-left:5px solid #769e76;background:#f8f9ef;padding:11px 14px;font-size:13px}.rep-diagram span:nth-child(2n){border-color:#bd8f70}.rep-diagram span:nth-child(3){margin-top:12px}@media(max-width:700px){.replication-view{grid-template-columns:1fr}}
.tools-heading{margin-top:65px}