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article{background:var(--surface);padding:22px}.technology-map h3{color:var(--accent);margin:0 0 16px}.technology-map p{color:var(--muted);margin:0 0 18px;line-height:1.65}.technology-map strong{border-top:1px solid var(--line);padding-top:14px;line-height:1.55;display:block}.engineering-shell a:focus-visible,.engineering-shell button:focus-visible{outline-offset:3px;outline:3px solid #c17c32}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (width<=800px){.engineering-hero,.engineering-section{width:min(calc(100% - 28px), var(--content-width))}.engineering-step-layout,.technology-map{grid-template-columns:1fr}.engineering-step-detail dl div{grid-template-columns:1fr;gap:7px}}.incident-intro,.mastery-section>p:not(.section-kicker){max-width:72ch;color:var(--muted);line-height:1.75}.incident-list{gap:8px;margin-top:30px;display:grid}.incident-list details{background:var(--surface);border:1px solid #cfd4ce}.incident-list summary{cursor:pointer;grid-template-columns:42px 1fr;gap:12px;padding:18px 20px;font-weight:780;line-height:1.5;display:grid}.incident-list summary span{color:var(--accent);font:750 .76rem/2 ui-monospace,SFMono-Regular,Menlo,monospace}.incident-list details[open] summary{color:#f8fff9;background:#254f43}.incident-list details[open] summary span{color:#b9dfd0}.incident-list dl{margin:0;padding:4px 20px 22px 74px}.incident-list dl div{border-top:1px solid var(--line);grid-template-columns:88px minmax(0,1fr);gap:16px;padding:13px 0;display:grid}.incident-list dt{color:var(--muted);font-size:.78rem}.incident-list dd{margin:0;line-height:1.7}.mastery-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:28px;display:grid}.mastery-list label{background:var(--surface);cursor:pointer;border:1px solid #cfd4ce;grid-template-columns:auto 1fr;align-items:start;gap:13px;padding:18px;line-height:1.6;display:grid}.mastery-list input{width:1.1rem;height:1.1rem;accent-color:var(--accent);margin:.18rem 0 0}.mastery-section>button{min-height:40px;color:var(--muted);cursor:pointer;background:0 0;border:1px solid #9fa8a1;border-radius:999px;margin-top:18px;padding:8px 14px;font-weight:700}.mastery-section>button:hover{color:var(--risk);border-color:var(--risk)}@media (width<=800px){.incident-list dl{padding:4px 16px 18px}.incident-list dl div,.mastery-list{grid-template-columns:1fr}.incident-list dl div{gap:6px}}