.pageheader{border-bottom:1px solid var(--hairline);justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:1rem;padding-bottom:.85rem;display:flex}.pageheader-lead{flex:auto;align-items:center;gap:.65rem;min-width:0;display:flex}.pageheader-back{appearance:none;width:2rem;height:2rem;color:var(--text-secondary);cursor:pointer;background:var(--surface-raised);border:1px solid var(--surface-border);border-radius:5px;flex:none;justify-content:center;align-items:center;font-family:IBM Plex Mono,monospace;font-size:1.2rem;display:inline-flex}.pageheader-back:hover,.pageheader-back:active{color:var(--text-primary);border-color:var(--border-glow)}.pageheader-glyph{color:var(--text-secondary);border-radius:4px;flex:none;padding:.05rem .35rem;font-family:ui-serif,Instrument Serif,Georgia,serif;font-size:1.4rem;font-style:italic;text-decoration:none}.pageheader-glyph:hover{color:var(--text-primary);background:var(--surface-raised)}.pageheader-titleblock{flex-direction:column;flex:auto;gap:.15rem;min-width:0;display:flex}.pageheader-title{letter-spacing:-.01em;color:var(--text-primary);margin:0;font-family:ui-serif,Instrument Serif,Georgia,serif;font-size:clamp(1.5rem,3.5vw,2.1rem);font-weight:400;line-height:1.1}.pageheader-sub{color:var(--text-tertiary);max-width:60ch;margin:0;font-family:IBM Plex Sans,system-ui,sans-serif;font-size:.85rem;line-height:1.4}.pageheader-actions{flex:none;align-items:center;gap:.5rem;display:flex}@media (max-width:640px){.pageheader-back{width:1.8rem;height:1.8rem;font-size:1.05rem}.pageheader-glyph{font-size:1.2rem}.pageheader-sub{font-size:.78rem}}