:root{--hub-bg:#edf1f6;--hub-panel:#fff;--hub-ink:#132035;--hub-muted:#4b5b71;--hub-line:#d7dfe9;--hub-soft:#e3eaf4;--hub-focus:#255ed4;color-scheme:light}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){--hub-bg:#0b131e;--hub-panel:#142238;--hub-ink:#f1f5fb;--hub-muted:#bccbdf;--hub-line:#293b52;--hub-soft:#1c304b;--hub-focus:#86b3ff;color-scheme:dark}}
:root[data-theme="dark"]{--hub-bg:#0b131e;--hub-panel:#142238;--hub-ink:#f1f5fb;--hub-muted:#bccbdf;--hub-line:#293b52;--hub-soft:#1c304b;--hub-focus:#86b3ff;color-scheme:dark}
.hub-shell,.hub-shell *{box-sizing:border-box}
.hub-shell{max-width:1100px;padding:20px 20px 0;margin:auto;color:var(--hub-ink);font-family:Archivo,system-ui,sans-serif}
body[data-course="cen100"] .hub-shell{max-width:1100px}
.hub-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.hub-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;font-weight:750;font-size:1rem;line-height:1.15}
.hub-brand small{display:block;color:var(--hub-muted);font-size:.8rem;margin-top:4px;font-weight:600}
.hub-mark{display:grid;place-items:center;border:1px solid var(--hub-line);width:40px;height:40px;border-radius:12px;background:var(--hub-panel);font:700 28px Georgia,serif}
.hub-theme{min-height:40px;cursor:pointer;font:600 .875rem Archivo,system-ui,sans-serif;border:1px solid var(--hub-line);border-radius:9px;padding:8px 12px;background:var(--hub-panel);color:var(--hub-ink)}
.course-switch{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,5.75rem),1fr));gap:8px}
.course-link{--link-accent:#f69cc3;display:grid;gap:4px;align-content:start;text-decoration:none;background:var(--hub-panel);border:1px solid var(--hub-line);border-radius:12px;padding:12px 15px;color:var(--hub-ink);min-width:0;position:relative;transition:border-color .15s,background .15s}
.course-link[data-course-link="mth140"]{--link-accent:#67e0f2}.course-link[data-course-link="mth141"]{--link-accent:#baa3ff}
/* The Desk (site root) sits first in every course switcher; neutral, since it is not a course. */
.course-link[data-course-link="desk"]{--link-accent:var(--hub-muted)}
.course-link[aria-current]{border-color:var(--link-accent);box-shadow:inset 0 -2px var(--link-accent)}
.course-code{font-weight:800;font-size:1.05rem;letter-spacing:.02em}.course-name{font-size:.875rem;line-height:1.2;color:var(--hub-muted);overflow-wrap:anywhere}
.course-saved{font-size:.75rem;font-weight:550;color:var(--hub-muted);min-height:1rem}
.hub-shell :focus-visible{outline:3px solid var(--hub-focus);outline-offset:3px}
@media(max-width:460px){.hub-shell{padding:16px 14px 0}.course-link{padding:11px 10px}.course-name{font-size:.8125rem}.hub-brand{font-size:.9rem}.hub-theme{padding:8px;font-size:.8125rem}}

.quick-find,.quick-find *,.quick-confirm,.quick-confirm *{box-sizing:border-box}
.quick-find{margin:18px 0 12px}
.quick-find>label:not(.tool-check):not(.inline-check){display:block;font-size:.9375rem;font-weight:650;margin:0 0 7px}
.quick-find input[type="search"]{display:block;width:100%;min-width:0;min-height:48px;padding:11px 13px;border:1px solid var(--hub-line);border-radius:10px;background:var(--hub-panel);color:var(--hub-ink);font:inherit;font-size:1rem}
.quick-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.quick-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 12px;border:1px solid var(--hub-line);border-radius:8px;background:var(--hub-panel);color:var(--hub-ink);font:inherit;font-size:.875rem;font-weight:600;text-decoration:none;cursor:pointer}
.quick-confirm{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border:1px solid var(--hub-line);border-radius:10px;background:var(--hub-panel);margin:12px 0}
.quick-confirm[hidden]{display:none!important}.quick-confirm p{margin:0;font-size:.875rem;line-height:1.45}.quick-confirm button{flex:0 0 auto}
.quick-find .search-status{font-size:.875rem;color:var(--hub-muted);margin:10px 0}.quick-find .search-status:empty{display:none}
.quick-find .search-results{list-style:none;display:grid;gap:6px;margin:10px 0;padding:0}.quick-find .search-results[hidden]{display:none}
.quick-find .search-results button{display:block;width:100%;text-align:left;overflow-wrap:anywhere}.quick-find .search-results small{display:block;margin-top:3px;font-size:.8125rem;color:var(--hub-muted);font-weight:450}
@media(hover:hover){.quick-link:hover{border-color:var(--hub-ink)}}
@media print{.quick-find,.quick-confirm{display:none!important}}


/* One shell across courses, including tablet portrait. */
body[data-course] .hub-shell,body[data-course] .wrap,body[data-course] .math-wrap{max-width:1100px;padding-inline:20px}
body[data-course="cen100"] .circuit-head{padding:30px 0 26px;overflow:hidden}
body[data-course="cen100"] .circuit-head h1{font-size:clamp(2.6rem,6vw,4.6rem);line-height:.96;letter-spacing:-.025em;max-width:820px;text-wrap:balance}
body[data-course="cen100"] .circuit{inset:0 0 0 auto;width:75%;height:100%}
.cen-next-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:16px;align-items:stretch;margin:18px 0 22px}
.cen-next-layout>section{min-width:0}
.cen-next-layout .next{height:100%;padding:24px;border-radius:18px;display:flex;flex-direction:column}
.cen-next-layout .next-open{flex:1}
.cen-next-layout .board{margin:0;padding:12px 20px;border:1px solid var(--line);border-radius:18px}
.cen-next-layout .dep{grid-template-columns:64px minmax(0,1fr);gap:6px 12px;padding:18px 0}
.cen-next-layout .dep .d{grid-row:1 / 3;font-size:.95rem}
.cen-next-layout .dep .c{grid-column:2;font-family:inherit;font-variation-settings:"wdth" 100;font-size:.8rem;color:var(--navy-ink);opacity:.8}
.course-link{overflow:hidden}
.course-link[aria-current]{background:linear-gradient(120deg,color-mix(in srgb,var(--link-accent) 10%,var(--hub-panel)),var(--hub-panel));box-shadow:inset 0 -3px var(--link-accent)}
@media(max-width:760px){.cen-next-layout{grid-template-columns:1fr}.cen-next-layout .board{padding:4px 18px}.cen-next-layout .dep{grid-template-columns:64px minmax(0,1fr) auto}.cen-next-layout .dep .d{grid-row:auto}.cen-next-layout .dep .c{grid-column:3}.cen-next-layout .next{padding:20px}}
@media(max-width:480px){body[data-course] .hub-shell,body[data-course] .wrap,body[data-course] .math-wrap{padding-inline:14px}.cen-next-layout .dep{grid-template-columns:54px minmax(0,1fr)}.cen-next-layout .dep .d{grid-row:1 / 3}.cen-next-layout .dep .c{grid-column:2}body[data-course="cen100"] .circuit-head h1{font-size:clamp(2.35rem,9vw,3rem)}}