/* Course chrome: a quiet index beside the lesson, not a second hero. */
.masthead .wordmark{font:600 17px/1.4 var(--font-ui);letter-spacing:-.02em;color:#20242b;text-decoration:none}
.masthead .wordmark em{font-style:normal;color:inherit}
nav.course-nav{position:relative;display:block;flex:none;max-width:100%;font:17px/1.5 var(--font-ui);letter-spacing:normal;text-align:left;z-index:30}
.course-nav-trigger{display:flex;align-items:center;gap:14px;max-width:100%;min-height:44px;padding:8px 0 8px 12px;border:0;background:transparent;color:#20242b;font:inherit;text-align:left;cursor:pointer;white-space:nowrap}
.course-nav-trigger:hover,.course-nav-trigger[aria-expanded="true"]{color:#2357a4}
.course-nav-label{font-size:17px;color:#59636e;border-right:1px solid #dce1e6;padding-right:14px}
.course-nav-current{font-size:17px;font-weight:500}
.course-nav-caret{width:12px;height:8px;margin-left:4px;flex:none;transition:transform .15s ease}
.course-nav-trigger[aria-expanded="true"] .course-nav-caret{transform:rotate(180deg)}
.course-nav-menu{position:absolute;top:calc(100% + 8px);right:0;width:min(340px,calc(100vw - 40px));max-height:calc(100vh - 100px);overflow-y:auto;padding:14px 12px;background:#fff;border:1px solid #dce1e6;border-top:2px solid #20242b;border-radius:0;box-shadow:none;box-sizing:border-box;z-index:40}
.course-nav-menu[hidden]{display:none!important}
.course-nav-heading{display:block;margin:2px 10px 10px;color:#59636e;font-size:17px}
.course-nav-menu a{display:flex;align-items:baseline;gap:12px;margin:0;padding:10px;border:0;color:#20242b;font-size:17px;line-height:1.5;text-decoration:none;white-space:normal}
.course-nav-menu a:hover{background:#f4f6f9;color:#2357a4}
.course-nav-number{flex:0 0 24px;color:#59636e;font-variant-numeric:tabular-nums;font-size:17px}
.course-nav-menu a[aria-current="page"],.course-nav-menu a.is-section-current{color:#2357a4;font-weight:600;border-left:2px solid #2357a4;padding-left:8px}
.course-nav-menu a.course-nav-home{margin-bottom:6px;border-bottom:1px solid #dce1e6}
.course-nav-menu a.course-nav-glossary{margin-top:6px;border-top:1px solid #dce1e6}
.course-nav-prerequisites{margin:0 0 6px;padding:0 0 10px 36px;border-bottom:1px solid #dce1e6}
.course-nav-prerequisites a{padding:7px 10px;font-size:17px;color:#59636e}
.course-nav-trigger:focus-visible,.course-nav-menu a:focus-visible{outline:2px solid #2357a4;outline-offset:4px}
.masthead-end{display:flex;flex-wrap:wrap;align-items:center;gap:0 28px;min-width:0;max-width:100%}
.course-repo-link{display:inline-flex;align-items:center;gap:.28em;min-height:44px;color:#20242b;font:17px/1.5 var(--font-ui);letter-spacing:normal;text-decoration:none;white-space:nowrap}
.course-repo-link:hover{color:#2357a4;text-decoration:underline;text-underline-offset:4px}
.course-repo-link:focus-visible{outline:2px solid #2357a4;outline-offset:4px}
@media(max-width:700px){.masthead-end{gap:0 20px}.course-repo-extra{display:none}}
@media(max-width:700px){nav.course-nav{width:auto;min-width:0}.course-nav-trigger{gap:10px;padding-left:0;white-space:normal}.course-nav-label{font-size:17px;padding-right:10px}.course-nav-current{font-size:17px;min-width:0}.course-nav-menu{left:0;right:auto;max-height:calc(100vh - 110px)}}
@media(prefers-reduced-motion:reduce){.course-nav-caret{transition:none}}

/* Academic attribution stays part of the reading flow. */
.course-source-note,.hero .course-source-note,.method-hero .course-source-note,.unit-directory .course-source-note{max-width:76ch;margin:14px 0;font-size:17px;line-height:1.7;color:#59636e;letter-spacing:normal}
.course-attribution{margin-top:24px;max-width:76ch}
.course-attribution strong{font-weight:600;color:#20242b}
.course-source-note a,.course-bibliography a{color:#2357a4;text-underline-offset:3px}
.course-footer-attribution{display:flex;flex-direction:column;align-items:flex-start;gap:5px;min-width:0}
footer .course-source-link{font-size:17px;line-height:1.6}
.course-references{scroll-margin-top:28px}
.course-bibliography{max-width:84ch;margin:24px 0;padding:0;list-style:none}
.course-bibliography li{margin:0 0 22px;padding:0;font-size:17px;line-height:1.7;overflow-wrap:anywhere;scroll-margin-top:28px}
.course-reference-label{display:block;margin-bottom:5px;font-size:17px;font-weight:600;color:#59636e}
.course-bibliography li:target{border-left:2px solid #2357a4;padding-left:14px}
@media(max-width:700px){.course-attribution{margin-top:20px}.course-source-note,.hero .course-source-note,.method-hero .course-source-note,.unit-directory .course-source-note{font-size:17px}.course-bibliography li{font-size:17px}}