.bts-hero {
  min-height: 72svh;
}

.bts-rule {
  max-width: 52rem;
  margin: 2rem 0 0;
  padding-left: 1.5rem;
  border-left: 1px solid var(--ink);
  color: var(--ink);
  font-size: clamp(1.2rem, 2vw, 1.65rem);
  line-height: 1.55;
}

.bts-context {
  max-width: 110rem;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 6vw, 6rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.bts-context summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  padding: clamp(2rem, 4vw, 3rem) 0;
}

.bts-context summary::-webkit-details-marker {
  display: none;
}

.bts-context summary:focus-visible {
  outline: 1px solid var(--ink);
  outline-offset: .6rem;
}

.bts-context-summary-copy {
  display: block;
}

.bts-context-summary-copy .eyebrow {
  display: block;
  margin: 0 0 .7rem;
}

.bts-context-title {
  display: block;
  max-width: 24ch;
  color: var(--ink);
  font-size: clamp(1.7rem, 3.5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.04em;
}

.bts-context-action {
  color: var(--muted);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  white-space: nowrap;
}

.bts-context-action::after {
  content: "Open context +";
}

.bts-context[open] .bts-context-action::after {
  content: "Close context −";
}

.bts-context-body {
  padding: clamp(2rem, 4vw, 3.5rem) 0 clamp(3.5rem, 7vw, 6rem);
  border-top: 1px solid var(--soft-line);
}

.bts-context-body > p {
  max-width: 52rem;
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  line-height: 1.8;
}

.bts-context-body > p:first-child {
  margin-top: 0;
}

.bts-context blockquote {
  max-width: 58rem;
  margin: clamp(2.5rem, 5vw, 4rem) 0 0;
  padding-left: clamp(1.25rem, 3vw, 2.5rem);
  border-left: 1px solid var(--ink);
}

.bts-context blockquote p {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2.7rem);
  line-height: 1.4;
  letter-spacing: -.025em;
}

.bts-index {
  max-width: 110rem;
  margin: 0 auto;
  padding: clamp(4rem, 8vw, 8rem) clamp(1.5rem, 6vw, 6rem);
}

.bts-card {
  display: grid;
  grid-template-columns: minmax(7rem, 12rem) minmax(0, 1fr) auto;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: end;
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  border-top: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}

.bts-card:last-child {
  border-bottom: 1px solid var(--line);
}

.bts-card small,
.bts-meta,
.chat-speaker,
.stage-direction {
  color: var(--dim);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.bts-card h2 {
  max-width: 18ch;
  font-size: clamp(2.2rem, 5vw, 5rem);
}

.bts-card p {
  max-width: 44rem;
  margin: 1rem 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.bts-arrow {
  align-self: center;
  font-size: 1.6rem;
  color: var(--muted);
}

.transcript-shell {
  max-width: 76rem;
  margin: 0 auto;
  padding: clamp(4rem, 8vw, 8rem) clamp(1.5rem, 6vw, 6rem) clamp(7rem, 12vw, 12rem);
}

.transcript-note {
  max-width: 56rem;
  margin: 0 0 clamp(3rem, 7vw, 6rem);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--line);
  color: var(--muted);
  line-height: 1.7;
}

.chat-log {
  border-top: 1px solid var(--line);
}

.chat-turn {
  display: grid;
  grid-template-columns: minmax(4rem, 7rem) minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 3rem);
  padding: clamp(1.8rem, 4vw, 3.2rem) 0;
  border-bottom: 1px solid var(--soft-line);
}

.chat-turn.mira {
  background: linear-gradient(90deg, rgba(255,255,255,.025), transparent 70%);
}

.chat-speaker {
  padding-top: .35rem;
  font-weight: 800;
}

.chat-copy {
  max-width: 58rem;
  font-size: clamp(1.02rem, 1.5vw, 1.24rem);
  line-height: 1.8;
}

.chat-copy p {
  margin: 0 0 1rem;
}

.chat-copy p:last-child {
  margin-bottom: 0;
}

.chat-copy pre {
  margin: 1.5rem 0;
  padding: 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
  color: var(--ink);
  font: .92rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
}

.stage-direction {
  margin: 1.25rem 0;
  padding: 1rem 0 1rem 1.25rem;
  border-left: 1px solid var(--line);
  line-height: 1.7;
  text-transform: none;
  letter-spacing: .08em;
}

.bts-back {
  display: inline-block;
  margin-top: 3rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
}

@media (max-width: 760px) {
  .bts-context summary {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .bts-context-action {
    justify-self: start;
  }

  .bts-card {
    grid-template-columns: 1fr;
  }

  .bts-arrow {
    display: none;
  }

  .chat-turn {
    grid-template-columns: 1fr;
    gap: .8rem;
  }
}