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var(--line)}.key-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.key-item{background:#fff;border:1px solid var(--line);border-radius:15px;padding:15px}.meta-line{font-size:.84rem;color:var(--muted)}.legacy-note{max-width:850px;margin:70px auto;padding:36px;background:#fff;border:1px solid var(--line);border-radius:24px;text-align:center}footer{margin-top:60px;padding:35px 5vw;background:#172a24;color:#f2efe8;display:flex;justify-content:space-between;gap:25px}footer p{color:#c9d0cc}.audit-badge{display:inline-block;background:#e8efe9;color:var(--green);font-size:.72rem;font-weight:900;padding:6px 9px;border-radius:999px}.mini-list{padding-left:20px}.mini-list li{margin:.35rem 0}.search-note{font-size:.9rem;color:var(--muted)}
@media(max-width:900px){.hero,.course-hero{grid-template-columns:1fr}.course-grid,.unit-grid,.source-grid,.media-grid,.wtf-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.site-header{align-items:flex-start}.site-header nav{justify-content:flex-end}.course-grid,.unit-grid,.source-grid,.media-grid,.wtf-grid,.gallery,.key-grid{grid-template-columns:1fr}.hero,.course-hero,.section,.course-home,.lesson-body{padding-left:18px;padding-right:18px}.figure-card img{height:auto}footer{display:block}}

/* Semester archive expansion */
.semester-kicker{font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:800}
.week-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem;margin:1.2rem 0 2rem}.week-card{display:block;padding:1.1rem;border:1px solid var(--line);border-radius:16px;background:var(--panel);text-decoration:none;color:inherit;transition:.16s ease}.week-card:hover{transform:translateY(-2px);border-color:var(--accent)}.week-no{font-size:.78rem;text-transform:uppercase;letter-spacing:.11em;color:var(--muted);font-weight:800}.week-card h3{margin:.35rem 0 .35rem}.week-card p{margin:0;color:var(--muted)}
.lesson-shell{max-width:1120px;margin:0 auto;padding:1.5rem}.lesson-hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:1.4rem;align-items:start}.lesson-hero h1{font-size:clamp(2rem,5vw,4.2rem);line-height:1;margin:.35rem 0 1rem}.lesson-deck{font-size:1.12rem;line-height:1.65;color:var(--muted)}.evidence-grid,.lesson-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem}.evidence-card,.lesson-panel{border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:1rem}.evidence-card h3,.lesson-panel h2{margin-top:0}.source-image{position:relative;min-height:280px;border-radius:16px;overflow:hidden;background:linear-gradient(135deg,var(--panel),var(--panel2));border:1px solid var(--line);display:flex;align-items:center;justify-content:center}.source-image img{width:100%;height:360px;object-fit:contain;background:#111}.source-image .loading-label{position:absolute;inset:auto 1rem 1rem 1rem;padding:.6rem .8rem;border-radius:10px;background:rgba(0,0,0,.68);color:white;font-size:.82rem}.source-image.loaded .loading-label{display:none}.source-image.image-failed .loading-label::after{content:' — open the repository record below if the preview is unavailable.'}.source-caption{font-size:.9rem;line-height:1.5;color:var(--muted);margin:.7rem 0}.source-record-link{font-weight:800}.source-live-meta{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em}.assignment-list{padding-left:1.2rem}.assignment-list li{margin:.45rem 0}.question-box{border-left:4px solid var(--accent);padding:.9rem 1rem;background:var(--panel);margin:1rem 0;border-radius:0 12px 12px 0}.source-chip{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:.32rem .62rem;margin:.15rem .25rem .15rem 0;font-size:.78rem;background:var(--panel2)}.course-navline{display:flex;gap:.55rem;flex-wrap:wrap;margin:1rem 0 1.5rem}.course-navline a{border:1px solid var(--line);border-radius:999px;padding:.45rem .75rem;text-decoration:none}.archive-note{font-size:.9rem;color:var(--muted);padding:.85rem 1rem;border:1px dashed var(--line);border-radius:12px}.repo-badge{font-size:.72rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted)}
@media(max-width:780px){.lesson-hero{grid-template-columns:1fr}.source-image img{height:300px}}