/* v5 — Teaching + books (/about#teaching). Wired 2026-09-13.
   Sits after the Principles row (.v5-principles, 128px bottom pad) and before .v5-ai
   (its own 1px border-top). Tokens only; nothing hard-coded, so the zn-theme
   palettes (BOTTLE/MINT is the baked default) repaint it like every other section.

   Tiers at 1440: head 56 / row line 28 / lede 14.5 / rail 13 / meta 12 (five).
   Hairlines: two, one per row. Outline boxes: none. */

.v5-teaching{
  position:relative;
  padding:72px 0 112px;
  background:var(--v4-paper-2);   /* its own surface: the block read as a tail of the Principles row (Chris 2026-09-13) */
}

/* Opener: the Disciplines opener without its two hairlines. Air above it comes
   from .v5-principles' bottom padding (128) plus this 48, about 176 text to text. */
.v5-teaching .v5-teaching-open,
.v5-teaching .v5-teaching-open .v5-section-open-row{border:0 !important}
.v5-teaching .v5-teaching-open{padding:0;margin-bottom:40px}
.v5-teaching-headline{max-width:none} /* one-line head, no emph, like the Disciplines opener */
.v5-teaching-copy{max-width:40ch}

/* Body: the rail + rows on the left, the course site on the right. */
.v5-teaching-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,440px);gap:24px 72px;align-items:start}
.v5-teaching-art{display:block;text-decoration:none;color:inherit;padding-top:26px}
.v5-teaching-art img{display:block;width:100%;height:auto;border-radius:6px;box-shadow:0 0 0 1px var(--v4-line),0 34px 64px -34px color-mix(in srgb,var(--v4-ink) 70%,transparent);transition:transform .7s var(--ease-soft, cubic-bezier(.22,.61,.36,1))}
.v5-teaching-art:hover img{transform:translateY(-4px)}
.v5-teaching-art-cap{display:block;margin-top:14px;font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--v4-mute)}
@media (max-width:1024px){ .v5-teaching-body{grid-template-columns:1fr} .v5-teaching-art{padding-top:8px;max-width:560px} }
/* Label rail + content column: label at x=40 (container pad), content at x=455. */
.v5-teaching-groups{display:flex;flex-direction:column;gap:20px} /* 28 row pad + 20 = 48 to the next rule */
.v5-teaching-group{
  display:grid;grid-template-columns:200px minmax(0,1fr);column-gap:40px;align-items:start;
}
.v5-teaching-rail{
  font-family:var(--mono);font-size:13px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--v4-mute);line-height:1.3;
  /* cap height aligned to the first row's meta line (row pad 26 + line offset) */
  padding-top:37px;
}

/* Rows: the homepage teaser row, re-tiered. Rules on top of each row only. */
.v5-teaching-rows.v5-teaser-rows{border-top:0}
.v5-teaching-rows .v5-teaching-row{
  grid-template-columns:1fr 40px;
  padding:26px 0 28px;
  border-top:1px solid var(--v4-line);border-bottom:0;
}
.v5-teaching-rows .v5-teaching-row .v5-teaser-row-name{font-size:12px;letter-spacing:.14em}
.v5-teaching-rows .v5-teaching-row .v5-teaser-row-line{font-size:28px;line-height:1.05}
.v5-teaching-rows .v5-teaching-row .v5-teaser-row-arr{font-size:20px;padding-right:0}
.v5-teaching-rows .v5-teaching-row.is-unlinked{cursor:default}
.v5-teaching-rows .v5-teaching-row.is-unlinked:hover{background:transparent;padding-left:0}
.v5-teaching-rows .v5-teaching-row.is-unlinked .v5-teaser-row-arr{color:var(--v4-line)}
.v5-teaching-rows .v5-teaching-row.is-unlinked:hover .v5-teaser-row-arr{transform:none;color:var(--v4-line)}

@media (max-width:900px){
  .v5-teaching{padding:56px 0 72px}
  .v5-teaching .v5-teaching-open{padding-top:24px;margin-bottom:28px}
  .v5-teaching-groups{gap:36px}
  .v5-teaching-group{grid-template-columns:1fr;row-gap:10px}
  .v5-teaching-rail{padding-top:0}
  .v5-teaching-rows .v5-teaching-row{padding:20px 0 22px}
  .v5-teaching-rows .v5-teaching-row .v5-teaser-row-line{font-size:22px}
  .v5-teaching-rows .v5-teaching-row .v5-teaser-row-arr{top:20px}
}