.course-tabs{display:flex;gap:6px;flex-wrap:wrap;padding:18px 0;border-bottom:1px solid var(--line);font-family:var(--sans);position:sticky;top:74px;z-index:12;background:rgba(251,250,247,.96)}.course-tabs a{padding:8px 12px;border-radius:5px;font-size:13px}.course-tabs a:hover{background:#fff;color:var(--accent)}
.definition-grid,.project-grid,.link-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.definition-grid article,.project-grid article{padding:22px;background:#fff;border:1px solid var(--line)}.definition-grid h3,.project-grid h3{margin:0 0 8px;font-size:21px}.definition-grid p,.project-grid p{margin:0;color:var(--muted);font-size:15px}.notice{padding:20px 22px;background:#fff;border-left:4px solid var(--accent)}.source-note{color:var(--muted);font:13px var(--sans)}
.official-links{padding:64px 0;background:#171512;color:#fff}.official-links h2{font-size:40px;margin:12px 0 28px}.link-grid{grid-template-columns:repeat(3,1fr)}.link-grid a{padding:22px;border:1px solid #45413c}.link-grid strong,.link-grid span{display:block}.link-grid span{margin-top:8px;color:#c7c2bb;font:13px var(--sans)}
@media(max-width:900px){.definition-grid,.project-grid,.link-grid{grid-template-columns:1fr}.course-tabs{position:static}}