:root{--oct-paper:#f5f2ec;--oct-panel:#e6e1d7;--oct-ink:#1b1a24;--oct-muted:#625d68;--oct-plum:#5a2a64;--oct-coral:#a83d2e;--oct-teal:#255f5b;--oct-amber:#805000;--oct-white:#fff;--oct-line:#cfc7bb;--oct-serif:Cochin,"Big Caslon","Book Antiqua",Georgia,serif;--oct-sans:Tahoma,Verdana,"Segoe UI",sans-serif;--oct-mono:"Andale Mono",Menlo,Consolas,"DejaVu Sans Mono",monospace}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--oct-paper);color:var(--oct-ink);font:16px/1.65 var(--oct-sans)}img{display:block;max-width:100%;height:auto}a{color:var(--oct-plum);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:var(--oct-coral)}a:focus-visible{outline:3px solid var(--oct-amber);outline-offset:4px}.oct-skip{position:fixed;z-index:10;top:-4rem;left:1rem;padding:.6rem 1rem;background:var(--oct-ink);color:#fff}.oct-skip:focus{top:1rem}.oct-mast{border-bottom:1px solid var(--oct-line);background:var(--oct-paper);padding:0 clamp(1rem,4vw,4rem)}.oct-mast__top{max-width:1120px;margin:auto;min-height:77px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.oct-brand{font:700 1.5rem/1 var(--oct-serif);letter-spacing:.035em;color:var(--oct-ink);text-decoration:none}.oct-brand span{color:var(--oct-coral)}.oct-brand i{display:block;margin-top:.35rem;font:600 .63rem/1 var(--oct-sans);letter-spacing:.12em;text-transform:uppercase;color:var(--oct-muted)}.oct-contact{font-size:.8rem;font-weight:700}.oct-nav{max-width:1120px;margin:auto;display:flex;gap:clamp(.7rem,2.4vw,2rem);overflow:auto;border-top:1px solid var(--oct-line);white-space:nowrap}.oct-nav a{min-height:48px;display:grid;place-items:center;font-size:.78rem;font-weight:700;color:var(--oct-ink);text-decoration:none}.oct-nav a[aria-current=page]{color:var(--oct-plum);box-shadow:inset 0 -3px var(--oct-coral)}.oct-hero{min-height:388px;position:relative;color:#fff;isolation:isolate;overflow:hidden}.oct-hero>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}.oct-hero__veil{position:absolute;inset:0;background:#5a2a64;opacity:.81;z-index:-1}.oct-hero__inside{width:min(1120px,calc(100% - 2rem));margin:auto;padding:3.6rem 0 2rem}.oct-hero__inside>p:first-child,.oct-kicker,.oct-section-heading>p{font-size:.73rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.oct-hero h1{max-width:740px;margin:.25rem 0 .7rem;font:clamp(2.6rem,6vw,5.2rem)/.94 var(--oct-serif);letter-spacing:-.04em}.oct-hero__inside>p:not(:first-child){max-width:550px;font-size:1.1rem}.oct-action{display:inline-flex;align-items:center;gap:1rem;margin-top:.6rem;padding:.82rem 1rem;background:#fff;color:var(--oct-plum);font-weight:800;text-decoration:none}.oct-action span{font-size:1.5rem;line-height:0}.oct-hero dl{display:flex;gap:clamp(1rem,4vw,4rem);margin:2.2rem 0 0}.oct-hero dt{font:700 1.05rem var(--oct-serif)}.oct-hero dd{margin:0;font-size:.75rem}.oct-home-section{width:min(1120px,calc(100% - 2rem));margin:0 auto;padding:4.5rem 0}.oct-section-heading{max-width:680px;margin-bottom:1.5rem}.oct-section-heading h2,.oct-route h2{margin:.15rem 0 .5rem;font:clamp(2rem,4vw,3.2rem)/1 var(--oct-serif);letter-spacing:-.035em}.oct-tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--oct-line);border:1px solid var(--oct-line)}.oct-tile{position:relative;background:var(--oct-paper);padding:1rem;min-height:230px}.oct-tile img{width:100%;aspect-ratio:1.7;object-fit:cover;margin:-1rem -1rem 1rem;width:calc(100% + 2rem)}.oct-tile span{font:700 .72rem var(--oct-mono);color:var(--oct-coral)}.oct-tile h3{margin:.25rem 0;font:1.6rem/1 var(--oct-serif)}.oct-tile h3 a{color:var(--oct-ink)}.oct-tile p{margin:.4rem 0 0;font-size:.84rem;color:var(--oct-muted)}.oct-route{display:grid;grid-template-columns:.75fr 1.25fr;gap:4rem;border-block:1px solid var(--oct-line)}.oct-route ol{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;list-style:none;padding:0;margin:0}.oct-route li{border-left:3px solid var(--oct-teal);padding-left:.7rem}.oct-route b{font:700 .76rem var(--oct-mono);color:var(--oct-teal)}.oct-route p{margin:.3rem 0;font-size:.87rem}.oct-sample{display:grid;grid-template-columns:.65fr 1.35fr;gap:3rem;background:var(--oct-panel);padding-inline:clamp(1rem,4vw,4rem);width:min(1240px,calc(100% - 2rem))}.oct-sample .oct-lesson{border:0;padding-top:0}.oct-textlink{font-weight:800}.oct-feedgrid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--oct-line);border-left:1px solid var(--oct-line)}.oct-feed{padding:1rem;border-right:1px solid var(--oct-line);border-bottom:1px solid var(--oct-line)}.oct-feed img{width:100%;aspect-ratio:1.45;object-fit:cover;margin-bottom:.9rem}.oct-feed time{font:700 .7rem var(--oct-mono);color:var(--oct-teal)}.oct-feed__tag{margin:.3rem 0 0;font-size:.68rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--oct-coral)}.oct-feed h3{margin:.25rem 0;font:1.22rem/1.1 var(--oct-serif)}.oct-feed h3 a{color:var(--oct-ink)}.oct-feed p:last-child{margin:.45rem 0 0;font-size:.81rem;color:var(--oct-muted)}.oct-sourceband{border-top:1px solid var(--oct-line);padding-top:2rem}.oct-page{width:min(1120px,calc(100% - 2rem));margin:auto;padding:1.25rem 0 4rem}.oct-crumbs{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center;margin:0 0 2.4rem;color:var(--oct-muted);font-size:.76rem}.oct-entry{max-width:800px;padding-bottom:2.5rem;border-bottom:1px solid var(--oct-line)}.oct-entry h1{margin:.2rem 0 .7rem;font:clamp(2.5rem,5.4vw,4.3rem)/.98 var(--oct-serif);letter-spacing:-.04em}.oct-entry>p:last-child{margin:0;font-size:1.15rem;max-width:690px}.oct-kicker{margin:0 0 .4rem;color:var(--oct-plum)}.oct-kicker span{margin-left:.6rem;color:var(--oct-muted);font-weight:400;letter-spacing:0;text-transform:none}.oct-layout{display:grid;grid-template-columns:14rem minmax(0,68ch);gap:clamp(2rem,6vw,6rem);margin-top:2.7rem}.oct-syllabus{align-self:start;position:sticky;top:1rem;border-top:3px solid var(--oct-plum);padding-top:.75rem}.oct-syllabus p{margin:0 0 .35rem;font-size:.75rem;font-weight:800;letter-spacing:.11em;text-transform:uppercase}.oct-syllabus a{display:block;padding:.25rem 0;font-size:.82rem}.oct-reading{min-width:0}.oct-reading--solo{max-width:68ch;margin:2rem auto}.oct-figure{margin:0 0 2.6rem}.oct-figure img{width:100%;aspect-ratio:1.6;object-fit:cover}.oct-figure figcaption{padding:.65rem 0;border-bottom:1px solid var(--oct-line);font-size:.78rem;color:var(--oct-muted)}.oct-lesson{position:relative;padding:0 0 2.6rem 2.8rem;margin-bottom:2.6rem;border-bottom:1px solid var(--oct-line)}.oct-number{position:absolute;top:.28rem;left:0;margin:0;color:var(--oct-coral);font:800 .78rem var(--oct-mono)}.oct-lesson h2,.oct-source h2,.oct-continue h2,.oct-reading--solo h2{margin:0 0 .65rem;font:2rem/1.05 var(--oct-serif);letter-spacing:-.025em}.oct-lesson p{margin:.7rem 0}.oct-recap{margin-top:1.2rem;padding:1rem;border-left:4px solid var(--oct-teal);background:color-mix(in srgb,var(--oct-teal) 8%,transparent)}.oct-recap p{margin:.15rem 0 0;font-size:.88rem}.oct-diagram{display:flex;align-items:center;gap:.35rem;flex-wrap:wrap;margin:1.4rem 0;padding:1rem;border:1px solid var(--oct-line);background:var(--oct-panel)}.oct-diagram b{display:grid;place-items:center;width:2.1rem;height:2.1rem;background:var(--oct-plum);color:#fff;font:800 .85rem var(--oct-mono)}.oct-diagram span{margin-left:.45rem;font-size:.78rem;color:var(--oct-muted)}.oct-diagram--feet span:not(:last-child){width:2.1rem;height:2.1rem;margin:0;display:grid;place-items:center;border:2px solid var(--oct-coral);border-radius:45% 45% 50% 50%;font:800 .8rem var(--oct-mono);color:var(--oct-coral)}.oct-diagram--feet i{font-size:1.25rem;color:var(--oct-teal)}.oct-scroll{overflow:auto;margin:1.1rem 0;border:1px solid var(--oct-line)}table{border-collapse:collapse;width:100%;min-width:550px;font-size:.82rem}th,td{padding:.65rem;text-align:left;vertical-align:top;border-bottom:1px solid var(--oct-line)}thead{background:var(--oct-ink);color:#fff}tbody tr:nth-child(even){background:color-mix(in srgb,var(--oct-panel) 55%,transparent)}.oct-decoder th{font-family:var(--oct-serif);font-size:1.05rem}.oct-ladder,.oct-plan{list-style:none;padding:0;margin:1rem 0}.oct-ladder li,.oct-plan li{display:grid;grid-template-columns:10rem 1fr;gap:1rem;padding:1rem;border-top:1px solid var(--oct-line)}.oct-ladder b{font-family:var(--oct-serif);font-size:1.2rem}.oct-walls{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:1rem;max-width:440px;margin:1rem auto;padding:1rem;border:1px solid var(--oct-line);background:var(--oct-panel)}.oct-walls b{min-height:80px;display:grid;place-items:center;text-align:center;border:2px solid var(--oct-teal);font-size:.82rem}.oct-walls i{position:absolute;inset:35%;display:grid;place-items:center;text-align:center;background:var(--oct-plum);color:#fff;border-radius:50%;font-size:.65rem;font-style:normal}.oct-sheet{padding:1rem;border-left:4px solid var(--oct-amber);background:var(--oct-panel)}.oct-sheet p{margin:.3rem 0}.oct-sheet code{font-family:var(--oct-mono);font-weight:800;color:var(--oct-plum)}.oct-check{padding:0;list-style:none}.oct-check li{padding:.7rem 0 .7rem 1.8rem;border-bottom:1px solid var(--oct-line);position:relative}.oct-check li:before{content:'✓';position:absolute;left:0;color:var(--oct-teal);font-weight:900}.oct-jot{padding:1rem 0;border-top:1px solid var(--oct-line)}.oct-jot time{font:700 .72rem var(--oct-mono);color:var(--oct-teal)}.oct-jot h3{margin:.3rem 0;font:1.35rem/1 var(--oct-serif)}.oct-jot p{margin:.35rem 0;font-size:.9rem}.oct-source{padding:1.25rem;border:1px solid var(--oct-line);background:var(--oct-panel)}.oct-source p{font-size:.86rem}.oct-continue{margin-top:2.6rem;padding-top:1.8rem;border-top:3px solid var(--oct-coral)}.oct-continue p{font-size:.92rem}.oct-footer{display:grid;grid-template-columns:1.4fr .8fr .9fr;gap:2rem;padding:3rem max(1rem,calc((100% - 1120px)/2));background:var(--oct-ink);color:#fff}.oct-footer strong{font:1.4rem var(--oct-serif)}.oct-footer p{margin:.4rem 0;font-size:.8rem;color:#d6d0db}.oct-footer a{display:block;color:#fff;font-size:.8rem;margin:.25rem 0}.oct-footer__date{grid-column:1/-1;border-top:1px solid #55515c;padding-top:1rem}.oct-404{min-height:100vh;display:grid;place-content:center;padding:2rem;background:var(--oct-plum);color:#fff}.oct-404 h1{max-width:680px;font:clamp(2.5rem,7vw,5rem)/.95 var(--oct-serif)}.oct-404 .oct-action{width:max-content}@media(max-width:60rem){.oct-tiles{grid-template-columns:repeat(2,1fr)}.oct-feedgrid{grid-template-columns:repeat(2,1fr)}.oct-route,.oct-sample{grid-template-columns:1fr;gap:2rem}.oct-layout{grid-template-columns:1fr;gap:1.6rem}.oct-syllabus{position:static;display:flex;flex-wrap:wrap;gap:.5rem 1rem;border-top:0;border-bottom:1px solid var(--oct-line);padding:0 0 1rem}.oct-syllabus p{width:100%}.oct-syllabus a{padding:0}.oct-hero__inside{padding-top:3rem}.oct-footer{grid-template-columns:1fr 1fr}.oct-hero dl{gap:1.2rem}.oct-sample{padding-inline:1rem}}@media(max-width:38rem){.oct-mast{padding:0 1rem}.oct-mast__top{min-height:70px}.oct-contact{display:none}.oct-hero{min-height:430px}.oct-hero h1{font-size:2.6rem}.oct-hero dl{display:grid;grid-template-columns:1fr 1fr}.oct-tiles,.oct-feedgrid{grid-template-columns:1fr}.oct-route ol{grid-template-columns:1fr}.oct-home-section{padding:3rem 0}.oct-lesson{padding-left:0}.oct-number{position:static;margin-bottom:.5rem}.oct-ladder li,.oct-plan li{grid-template-columns:1fr;gap:.25rem}.oct-footer{grid-template-columns:1fr}.oct-entry h1{font-size:2.65rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}


/* Keep the compact navigation inside the viewport on small screens. */
@media(max-width:38rem){
  .oct-nav{width:100%;min-width:0;flex-wrap:wrap;gap:.25rem .85rem;overflow:visible;white-space:normal;padding-bottom:.5rem}
  .oct-nav a{min-height:40px}
  .oct-section-heading,.oct-lesson,.oct-scroll{min-width:0;max-width:100%}
  .oct-scroll{width:100%;overflow-x:auto}
  .oct-scroll table{width:550px;max-width:none}
}