.portal-bar{max-width:1280px;margin:auto;display:flex;align-items:center;gap:24px;padding:16px 48px;border-bottom:1px solid #e3e7ec;font:14px/1.6 Arial,sans-serif}.portal-bar a{text-decoration:none}.portal-bar .portal-logo{font-weight:700;letter-spacing:1.4px;margin-right:auto;color:#0f3d63}.portal-logo span{font-weight:400;font-size:12px;letter-spacing:2px}.portal-bar button{font:inherit;background:none;color:#0f3d63;border:1px solid #c5d3df;border-radius:4px;padding:10px 14px;min-height:44px;cursor:pointer}.portal-colophon{border-top:1px solid #e3e7ec;max-width:1184px;margin:35px auto;padding:25px 24px;font:13px/1.8 Arial,sans-serif;color:#5b6472}.worksheet-downloads{font:16px/1.7 Arial,sans-serif;background:#f6f8fa;padding:18px;margin:25px 0}.worksheet-downloads summary{cursor:pointer;min-height:44px}.share-fab{position:fixed;bottom:18px;right:18px;z-index:10;border:1px solid #b6c8d6;border-radius:50%;width:48px;height:48px;background:#0f3d63;color:#fff;font:26px/1 Arial,sans-serif;cursor:pointer;box-shadow:0 4px 18px #0f3d6329}#share-dialog{box-sizing:border-box;max-width:calc(100vw - 26px);width:742px;max-height:calc(100dvh - 26px);overflow:auto;border:1px solid #c5d3df;border-radius:10px;padding:28px;background:#fff;color:#12151a;font:14px/1.7 Arial,sans-serif}#share-dialog::backdrop{background:#0d2037bf}.share-close{position:sticky;top:0;float:right;width:44px;height:44px;border-radius:50%;border:1px solid #c5d3df;background:#fff;color:#0f3d63;font-size:28px;cursor:pointer}#share-title{font:600 30px/1.3 Arial,sans-serif;margin:18px 45px 20px 0}#share-dialog .eyebrow{font-size:11px;color:#5b6472}#share-dialog .share-scope{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}#share-dialog button{font-family:Arial,sans-serif;cursor:pointer}#share-dialog .share-scope button{border:1px solid #c5d3df;border-radius:22px;padding:10px 13px;min-height:44px;background:#fff;color:#0f3d63}#share-dialog .share-scope button[aria-pressed=true]{background:#0f3d63;color:#fff}.share-preview{border:1px solid #e3e7ec;border-radius:6px;overflow:hidden;margin:20px 0}.share-preview img{display:block;width:100%;height:auto;aspect-ratio:1200/742;object-fit:contain}.share-preview p{padding:13px 18px;margin:0}.share-preview span{display:block;color:#5b6472;font-size:12px}.share-preview strong{display:block;font-size:15px;color:#12151a}.share-channels{display:grid;grid-template-columns:1fr 1fr;gap:8px}.share-channels a,.share-channels button{border:1px solid #c5d3df;background:#fff;color:#0f3d63;border-radius:4px;min-height:48px;display:flex;align-items:center;justify-content:center;text-decoration:none;padding:10px 8px;font:14px/1.5 Arial,sans-serif}.share-secondary{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin:21px 0}.share-secondary .btn{border:0;background:#0f3d63;color:#fff;border-radius:4px;padding:13px 20px;min-height:48px;font:14px Arial,sans-serif}.share-secondary .text-link{font:13px/1.6 Arial,sans-serif;min-height:44px;background:none;border:0;color:#0f3d63;display:flex;align-items:center;text-decoration:underline;text-underline-offset:4px}.share-link-label{display:block;font-size:13px}.share-link-label input{display:block;width:100%;box-sizing:border-box;border:1px solid #c5d3df;background:#fff;color:#12151a;padding:12px;margin-top:8px;font-size:13px}.share-help{font-size:12px;color:#5b6472}#share-status{min-height:22px;font-size:13px;color:#0f3d63}#share-dialog :focus-visible,.portal-bar :focus-visible,.share-fab:focus-visible{outline:3px solid #638bb2;outline-offset:3px}
@media(max-width:620px){.portal-bar{padding:12px 18px;gap:8px 16px;flex-wrap:wrap;font-size:12px}.portal-bar .portal-logo{width:calc(100% - 165px)}.portal-bar button{margin-left:auto;font-size:12px;padding:8px 10px}.portal-bar a:not(.portal-logo){min-height:44px;display:inline-flex;align-items:center}#share-dialog{padding:20px}#share-title{font-size:25px}.share-channels a,.share-channels button{font-size:13px}.share-secondary .btn{width:100%}}
.chapter-tools button{font:14px/1.6 Arial,sans-serif;min-height:44px;border:0;border-bottom:1px solid #9db1c2;background:none;color:#0f3d63;padding:8px 0;margin-top:12px;cursor:pointer}.sidebar a,.mobile-toc a{min-height:42px}.sidebar{max-height:calc(100vh - 40px);overflow-y:auto;padding-right:7px}.chapter-opener img{background:#f6f8fa}@media(max-width:900px){.sidebar{max-height:none;overflow:visible}}