.reading-main{max-width:1120px}.reading-intro{padding:32px 0}.back-link{display:inline-block;font-size:13px;margin-bottom:30px;text-decoration:none}.reading-intro h1{font-size:clamp(32px,4.2vw,48px)}.reading-intro>p:last-child{max-width:750px;color:var(--atlas-muted);font-size:16px;margin-top:17px}.reading-steps{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:7px;margin:0 0 28px}.reading-steps button{display:flex;align-items:center;gap:9px;background:var(--atlas-surface);color:var(--atlas-ink);border:1px solid var(--atlas-line);border-radius:7px;padding:12px;font-size:13px;text-align:left;min-height:44px}.reading-steps button span{font-size:11px;color:var(--atlas-muted)}.reading-steps button[aria-pressed=true]{background:var(--atlas-brand);color:var(--atlas-brand-on);border-color:var(--atlas-brand)}.reading-steps button[aria-pressed=true] span{color:var(--atlas-brand-on)}.lesson-stage{border:1px solid var(--atlas-line);border-radius:14px;background:var(--atlas-surface);padding:30px;scroll-margin-top:20px}.reading-copy .eyebrow{margin-bottom:10px}.reading-copy>p:last-child{max-width:870px;color:var(--atlas-muted);font-size:15px;margin-top:16px}.reading-prompt{margin:18px 0 8px;color:var(--atlas-brand);font-size:14px}.reading-trace-panel{margin:20px 0 0}.reading-trace-panel .trace-caption{flex-wrap:wrap;margin-top:3px}.interval-choice{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:22px 0 0;border-top:1px solid var(--atlas-line);padding-top:20px}.interval-choice label{font-size:14px}.interval-choice select{width:105px;margin:0;font-size:16px}.interval-choice p{flex-basis:100%;font-size:14px;color:var(--atlas-muted)}.measurement-controls{border-top:1px solid var(--atlas-line);padding-top:22px;margin-top:22px}.caliper-fields{display:grid;grid-template-columns:1fr 1fr;gap:32px}.caliper-fields input{min-height:24px}.measured-result{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:13px;margin:14px 0 18px}.measured-result output{font-size:22px;line-height:1.4;font-weight:500;color:var(--atlas-brand);font-variant-numeric:tabular-nums}.measured-result>span:last-child{color:var(--atlas-muted);font-size:12px;margin-left:auto}.measurement-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.text-button{font-size:12px;color:var(--atlas-brand);border:0;padding:10px;background:transparent;text-decoration:underline;text-underline-offset:3px;min-height:40px}.measurement-feedback{margin-top:18px;font-size:14px}.measurement-feedback:has(p:empty):not(:has(p:not(:empty))){display:none}.measurement-feedback .small{margin-top:8px}.reading-observation{border-top:1px solid var(--atlas-line);padding-top:22px;margin-top:24px;display:grid;grid-template-columns:170px 1fr;gap:22px}.reading-observation>span{font-size:12px;font-weight:600;color:var(--atlas-brand);line-height:1.6}.reading-observation p{font-size:14px;color:var(--atlas-muted)}.reading-pagination{display:flex;align-items:center;justify-content:space-between;gap:15px;padding-top:26px;margin-top:26px;border-top:1px solid var(--atlas-line)}.reading-pagination>span{font-size:12px;color:var(--atlas-muted)}.reading-check{margin-top:26px}.reading-check label{align-items:start;line-height:1.65}.reading-check input{flex-shrink:0;margin-top:4px}.reading-references{margin:24px 0 36px;color:var(--atlas-muted);font-size:12px}.reading-references p{max-width:900px;margin-top:12px}
@media(max-width:900px){.reading-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.lesson-stage{padding:24px}.reading-main{max-width:100%}}
@media(max-width:600px){.lesson-stage{padding:18px}.reading-steps button{padding:10px;gap:7px;font-size:12px}.caliper-fields{grid-template-columns:1fr;gap:13px}.reading-observation{grid-template-columns:1fr;gap:9px}.measured-result>span:last-child{flex-basis:100%;margin-left:0}.reading-pagination{gap:10px}.reading-pagination .button{font-size:12px}.reading-pagination>span{font-size:11px}}
@media(max-width:380px){.reading-steps{grid-template-columns:1fr 1fr}.lesson-stage{padding:14px}.reading-intro{padding:24px 0}.reading-copy h2{font-size:24px}.reading-intro>p:last-child{font-size:14px}.reading-pagination .button{gap:5px;padding:8px}.measurement-actions{gap:8px}.measurement-actions .button{font-size:12px}}