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@media(max-width:1050px){.workspace{grid-template-columns:215px minmax(0,1fr);gap:24px}.textbook-controls{gap:12px}.textbook-controls label{min-width:175px}.textbook-controls .beyond-button{min-height:34px}.chapter{padding-inline:8px}.chapter div{font-size:.95rem}}
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.workspace{padding:0}.chapter.active{box-shadow:none}.response-block>p{white-space:pre-line}.conversation-turn{padding-top:28px;margin-top:28px;border-top:1px solid var(--line)}.question-form{margin-bottom:30px}.response-citations{display:flex;gap:15px;flex-wrap:wrap;font-size:.875rem}.response-citations a,.passage-evidence a{text-decoration:underline}.response-origin{font:600 .8rem/1.5 Arial,sans-serif;letter-spacing:.04em}.passage-evidence{padding:14px;margin:14px 0;font-size:.9rem}.ask-status{color:#426750}.open-output{background:#f8fbf9;border:1px solid #d2e0d7;border-radius:4px;padding:24px;margin-top:16px}.open-output .response-block{background:transparent!important}.response-notice{font-size:.875rem;color:#4e715a}

/* Reading controls: direct chapter access, four projections, then source scope. */
.textbook-controls{display:block;padding:0;background:#fff;border:1px solid #d6e1db;border-radius:12px;box-shadow:0 3px 12px #183b3805;overflow:hidden}
.reading-tools{display:flex;align-items:stretch;gap:12px;padding:12px}
.projection-tools{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;flex:1;min-width:0;padding-left:12px;border-left:1px solid #e0e7e3}
.reader-action{display:flex;align-items:center;justify-content:center;gap:8px;min-width:0;min-height:48px;border:1px solid transparent;border-radius:8px;background:transparent;color:#4c655b;padding:10px 12px;font:500 .875rem/1.3 Arial,sans-serif;transition:background .15s,color .15s}
.reader-action svg{width:20px;height:20px;flex-shrink:0}.reader-action span{white-space:nowrap}
.reader-action:hover{background:#f0f5f2;color:#1d5247}.reader-action[aria-pressed="true"]{background:#e5f0eb;color:#164f41;border-color:#c9dfd3;font-weight:600}
.reading-tools>.reader-action{padding-inline:18px}.reading-tools>.reader-action[aria-pressed="true"]{background:#245c4e;color:#fff;border-color:#245c4e}
.boundary-bar{display:flex;align-items:center;flex-wrap:wrap;gap:8px 12px;padding:10px 18px;border-top:1px solid #e5ebe7;background:#f9fbfa}
.textbook-controls .boundary-bar label{display:block;flex:0 0 auto;min-width:0;gap:0;margin:0;font:400 .875rem/1.4 Arial,sans-serif;color:#6a7c72}
.textbook-controls .boundary-bar select{width:auto;max-width:100%;min-height:40px;padding:8px 28px 8px 9px;border:1px solid transparent;background-color:transparent;border-radius:6px;font-size:.875rem;color:#234f42}
.textbook-controls .boundary-bar select:hover{border-color:#d6e1db;background-color:#fff}
.beyond-link{margin-left:auto;padding:9px 0;color:#4c6f60;font:.875rem/1.4 Arial,sans-serif;text-decoration:underline;text-decoration-color:#a4b9ae;text-underline-offset:4px;white-space:nowrap}
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.resource-card>summary{cursor:pointer;line-height:1.6}.resource-card>summary>span{color:#6a7d71;margin-right:8px}
.resource-details{padding:12px 0 4px 18px;display:grid;gap:9px}.resource-card .resource-details label{align-items:center;gap:8px}.resource-card input{margin:0}.resource-details a{width:fit-content;text-underline-offset:3px}.resource-card small{font-size:.8rem;line-height:1.6}
@media(max-width:1100px){.reader-action{flex-direction:column;gap:6px;padding:9px 8px}.reading-tools>.reader-action{padding-inline:14px}.boundary-bar{gap:6px 10px}}
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@media(max-width:540px){.reading-tools{display:block}.reading-tools>.reader-action{width:100%;flex-direction:row;min-height:44px}.projection-tools{grid-template-columns:repeat(2,minmax(0,1fr));border-left:0;border-top:1px solid #e0e7e3;margin-top:10px;padding:10px 0 0;gap:4px}.projection-tools .reader-action{flex-direction:row;min-height:44px}.boundary-bar{gap:4px 8px}.textbook-controls .boundary-bar select{flex:1;min-width:0;padding-left:4px;font-size:.875rem}.beyond-link{margin-left:0;flex-basis:100%;padding:6px 0 2px}.resource-card>summary>span{display:block;margin:0}}
@media(prefers-reduced-motion:reduce){.reader-action{transition:none}}

.boundary-label{font:.875rem/1.4 Arial,sans-serif;color:#6a7c72}.boundary-value{font:500 .875rem/1.4 Arial,sans-serif;color:#234f42;padding:8px 0}