/* Keep the early content groups; give each later chapter an alternating surface. */
#competition.comp-refined{--comp-ink:#191c1b;--comp-surface:#202321;background:var(--comp-ink);padding-top:96px;padding-bottom:76px;border-top:0}
#details{background:#191c1b;border-top:0;padding-block:80px}
#materials{background:radial-gradient(ellipse at 75% 20%,#c7b99508,transparent 55%),#0e1011;border-top:0}
#control{background:#191c1b;border-top:0;padding-block:80px}
#gallery{background:#0e1011}
#method{background:#191c1b;padding-top:88px;border-top:0}
#evaluation{background:#0e1011;border-top:0}
#release{background:#191c1b;padding-top:88px;border-top:0}
/* A hairline with two precise returns echoes the reference image's corner frame. */
#competition,#materials,#method,#release{position:relative}
#competition::before,#materials::before,#method::before,#release::before{content:'';display:block;position:absolute;top:0;left:var(--page);right:var(--page);height:9px;border:1px solid #c7b99550;border-bottom:0;pointer-events:none;background:none;transform:none;opacity:1}
#details,#control,#evaluation{position:relative}
#details::before,#control::before,#evaluation::before{content:'';display:block;position:absolute;top:0;left:var(--page);right:var(--page);height:1px;background:#c7b99529;pointer-events:none;transform:none;opacity:1}
html.chapter-paper #method::before{border-color:#78674170}
html.chapter-paper #evaluation::before{background:#c8c5bc}
@media(max-width:720px){
 #competition.comp-refined{padding-top:64px;padding-bottom:60px}
 #details,#control{padding-block:60px}
 #materials,#method,#release{padding-top:64px}
 #competition::before,#materials::before,#method::before,#release::before{height:7px}
}