:root{--bg:#fbfaf7;--fg:#1d1d1b;--muted:#5e5b55;--line:#d9d5cc;--accent:#2f5d50}
@media (prefers-color-scheme:dark){:root{--bg:#161513;--fg:#e9e6df;--muted:#a8a399;--line:#3a3833;--accent:#8fc9b5}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 Georgia,"Times New Roman",serif}
header,main,footer{max-width:46rem;margin:0 auto;padding:0 1rem}
header{padding-top:1.5rem;border-bottom:1px solid var(--line)}
.site{font:600 1.05rem/1.2 system-ui,sans-serif;color:var(--fg);text-decoration:none}
nav{margin:.75rem 0 1rem;display:flex;flex-wrap:wrap;gap:.25rem 1.25rem;font:.95rem/1.4 system-ui,sans-serif}
nav a{color:var(--muted);text-decoration:none}
nav a[aria-current]{color:var(--fg);border-bottom:2px solid var(--accent)}
h1{font-size:1.9rem;line-height:1.2;margin:1.75rem 0 .5rem}
h2{font-size:1.3rem;margin:2rem 0 .5rem}
a{color:var(--accent)}
.lead{font-size:1.1rem;color:var(--muted)}
figure{margin:1.5rem 0}
figure img{display:block;width:100%;height:auto;border:1px solid var(--line)}
figure img.tape{max-width:24rem}
figcaption{font:.9rem/1.4 system-ui,sans-serif;color:var(--muted);margin-top:.4rem}
table{border-collapse:collapse;width:100%;font:.95rem/1.3 ui-monospace,Menlo,Consolas,monospace}
th,td{border-bottom:1px solid var(--line);padding:.35rem .4rem;text-align:left;vertical-align:top}
th{font-family:system-ui,sans-serif;font-weight:600}
td.holes{letter-spacing:.15em;white-space:nowrap}
.scroll{overflow-x:auto}
ol.timeline{list-style:none;padding:0}
ol.timeline li{padding:.5rem 0 .5rem 6.5rem;position:relative;border-bottom:1px solid var(--line)}
ol.timeline b{position:absolute;left:0;top:.5rem;font-family:ui-monospace,Menlo,Consolas,monospace}
footer{margin-top:3rem;padding:1rem;border-top:1px solid var(--line);font:.85rem/1.5 system-ui,sans-serif;color:var(--muted)}