/* proof piece: scope every selector to [data-piece="proof"] */

[data-piece="proof"] {
  --pf-pad: clamp(72px, 9vw, 132px);
  --pf-edge: clamp(16px, 2.4vw, 36px);
  --pf-inset: max(var(--gutter), calc((100vw - var(--wrap)) / 2 + var(--gutter)));
  --pf-stage: var(--band);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) [data-piece="proof"] { --pf-stage: #0b0a08; }
}
:root[data-theme="dark"] [data-piece="proof"] { --pf-stage: #0b0a08; }

[data-piece="proof"] h2 em { font-style: normal; color: var(--gold-ink); }
[data-piece="proof"].band h2 em { color: var(--gold); }
:where([data-piece="proof"] ul[role="list"]) { list-style: none; margin: 0; padding: 0; }

/* ---------- Split: image bleeds to the viewport edge, copy aligns to the wrap ---------- */
[data-piece="proof"] .pf-split {
  display: grid;
  align-items: center;
}
[data-piece="proof"] .pf-split--img-left {
  grid-template-columns: minmax(0, 46fr) minmax(0, 54fr);
  padding-left: var(--pf-edge);
}
[data-piece="proof"] .pf-split--img-left .pf-copy { padding-inline: clamp(40px, 6.5vw, 104px) var(--pf-inset); }

[data-piece="proof"] .pf-photo { margin: 0; }
[data-piece="proof"] .pf-photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--band);
}
[data-piece="proof"] .pf-photo figcaption {
  margin-top: 12px;
  font-size: var(--t-xs);
  letter-spacing: 0.04em;
  color: var(--muted);
}
[data-piece="proof"] .pf-copy { max-width: calc(50ch + 200px); }
[data-piece="proof"] .pf-copy h2 {
  font-size: var(--t-2xl);
  margin-top: 18px;
  max-width: 14ch;
}
[data-piece="proof"] .pf-lede {
  margin-top: 24px;
  font-size: var(--t-lg);
  line-height: 1.5;
  color: var(--muted);
  max-width: 40ch;
}

/* ---------- Standards: split + stat row ---------- */
[data-piece="proof"].pf-standards {
  padding-block: var(--pf-pad);
  border-top: 1px solid var(--rule);
}
[data-piece="proof"].pf-standards .pf-photo img { object-position: 70% 50%; }

[data-piece="proof"] .pf-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(48px, 5vw, 72px);
  border-top: 1px solid var(--ink);
}
[data-piece="proof"] .pf-stat {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(24px, 3vw, 36px) clamp(20px, 3vw, 40px) 4px;
}
[data-piece="proof"] .pf-stat:first-child { padding-left: 0; }
[data-piece="proof"] .pf-stat + .pf-stat { border-left: 1px solid var(--rule); }
[data-piece="proof"] .pf-key {
  margin-top: 2px;
  font-size: var(--t-lg);
  color: var(--ink);
}
[data-piece="proof"] .pf-stat p:not(.label) {
  color: var(--muted);
  font-size: var(--t-md);
  max-width: 34ch;
}

/* ---------- Pause: one line between hairlines ---------- */
[data-piece="proof"].pf-pause {
  padding: 0 var(--gutter) var(--pf-pad);
  text-align: center;
}
[data-piece="proof"].pf-pause p {
  display: inline-block;
  padding: 22px clamp(24px, 5vw, 72px);
  border-inline: 1px solid var(--rule);
  font: 500 var(--t-md)/1.6 var(--f-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}
[data-piece="proof"] .pf-pause-sep { color: var(--gold-ink); padding-inline: 0.5em; }

/* ---------- Fleet: spec rows on the dark ground ---------- */
[data-piece="proof"].pf-fleet {
  background: var(--pf-stage);
  padding-block: var(--pf-pad);
  border-block: 1px solid var(--band-rule);
}
[data-piece="proof"] .pf-fleet-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px clamp(32px, 6vw, 96px);
  align-items: end;
  margin-bottom: clamp(48px, 6vw, 80px);
}
[data-piece="proof"] .pf-fleet-head h2 { font-size: var(--t-2xl); margin-top: 18px; max-width: 14ch; }
[data-piece="proof"] .pf-fleet-aside p { color: var(--band-muted); max-width: 44ch; }
[data-piece="proof"] .pf-fleet-aside .link-arrow { display: inline-block; margin-top: 20px; color: var(--band-ink); }
[data-piece="proof"] .pf-fleet-aside .link-arrow:hover { color: var(--gold); }

[data-piece="proof"] .pf-group { border-top: 1px solid var(--band-rule); }
[data-piece="proof"] .pf-group + .pf-group { margin-top: clamp(40px, 5vw, 64px); }
[data-piece="proof"] .pf-group summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 20px;
  align-items: center;
  gap: 20px;
  padding-block: 22px;
  cursor: pointer;
  list-style: none;
}
[data-piece="proof"] .pf-group summary::-webkit-details-marker { display: none; }
[data-piece="proof"] .pf-group-name { font-family: var(--f-display); font-size: var(--t-xl); line-height: 1.2; }
[data-piece="proof"] .pf-group-count {
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
}
[data-piece="proof"] .pf-toggle { position: relative; width: 20px; height: 20px; }
[data-piece="proof"] .pf-toggle::before,
[data-piece="proof"] .pf-toggle::after {
  content: "";
  position: absolute;
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1px;
  background: var(--band-ink);
}
[data-piece="proof"] .pf-toggle::after { transform: rotate(90deg); }
[data-piece="proof"] .pf-group[open] .pf-toggle::after { transform: rotate(0deg); }
[data-piece="proof"] .pf-group summary:hover .pf-toggle::before,
[data-piece="proof"] .pf-group summary:hover .pf-toggle::after { background: var(--gold); }
@media (prefers-reduced-motion: no-preference) {
  [data-piece="proof"] .pf-toggle::after { transition: transform 0.2s; }
}

[data-piece="proof"] .pf-strip { margin: clamp(48px, 6vw, 80px) 0; }
[data-piece="proof"] .pf-strip img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: contain; }
[data-piece="proof"] .pf-group-note { margin: -6px 0 18px; color: var(--gold); }
[data-piece="proof"] .pf-rows { margin: 0; }
[data-piece="proof"] .pf-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2.2fr);
  gap: 8px 32px;
  align-items: baseline;
  padding-block: 20px;
  border-top: 1px solid var(--band-rule);
}
[data-piece="proof"] .pf-row dt {
  font: 500 var(--t-xs)/1.4 var(--f-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--band-muted);
}
[data-piece="proof"] .pf-row dd { margin: 0; }
[data-piece="proof"] .pf-row ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  row-gap: 6px;
}
[data-piece="proof"] .pf-row li {
  font-family: var(--f-display);
  font-size: var(--t-lg);
  line-height: 1.3;
  color: var(--band-ink);
  white-space: nowrap;
}
[data-piece="proof"] .pf-row li + li::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 0.9em;
  margin-inline: 18px;
  vertical-align: -0.08em;
  background: var(--band-rule);
}

/* ---------- Operators ---------- */
[data-piece="proof"].pf-operators { padding-block: var(--pf-pad); }
[data-piece="proof"] .pf-names { margin-top: 36px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(20px, 4vw, 48px); }
[data-piece="proof"] .pf-names li {
  display: grid;
  gap: 8px;
  padding-block: 18px 20px;
  border-top: 1px solid var(--ink);
}
[data-piece="proof"] .pf-name { font-family: var(--f-display); font-size: var(--t-xl); line-height: 1.15; }
[data-piece="proof"] .pf-kind {
  font-size: var(--t-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
[data-piece="proof"] .pf-also-label { margin-top: 36px; }
[data-piece="proof"].pf-operators h2 { font-size: var(--t-2xl); max-width: 18ch; margin-top: 16px; }
[data-piece="proof"] .pf-also {
  margin-top: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(20px, 4vw, 48px);
  font-size: var(--t-sm);
}

/* ---------- NBAA-BACE 2026: the documented slim .nbaa band ---------- */
[data-piece="proof"] .pf-arrow { transform: rotate(90deg); }

/* Regulatory limit: the documented .scope-note, prose capped per §3 */
[data-piece="proof"] .pf-scope { max-width: 62ch; }
@media (prefers-reduced-motion: no-preference) {
  [data-piece="proof"] .pf-arrow { transition: transform 0.15s; }
  [data-piece="proof"] .btn-beam:hover .pf-arrow { transform: rotate(90deg) translateY(-2px); }
}

/* ---------- Narrow screens ---------- */
@media (max-width: 860px) {
  [data-piece="proof"] .pf-fleet-head { grid-template-columns: minmax(0, 1fr); }
  [data-piece="proof"] .pf-stats { grid-template-columns: minmax(0, 1fr); border-top: 0; }
  [data-piece="proof"] .pf-stat,
  [data-piece="proof"] .pf-stat:first-child { padding: 24px 0 28px; border-top: 1px solid var(--ink); }
  [data-piece="proof"] .pf-stat + .pf-stat { border-left: 0; border-top-color: var(--rule); }
}
@media (max-width: 760px) {
  [data-piece="proof"] .pf-split--img-left {
    grid-template-columns: minmax(0, 1fr);
    padding-inline: 0;
    row-gap: 40px;
  }
  [data-piece="proof"] .pf-split--img-left .pf-copy { padding-inline: var(--gutter); }
  [data-piece="proof"] .pf-photo img { aspect-ratio: 4 / 3; }
  [data-piece="proof"] .pf-strip img { aspect-ratio: 16 / 9; }
  [data-piece="proof"] .pf-photo figcaption { padding-inline: var(--gutter); }
  [data-piece="proof"] .pf-stats { margin-top: 48px; }

  [data-piece="proof"].pf-pause p { padding-inline: 20px; font-size: var(--t-sm); letter-spacing: 0.1em; text-wrap: balance; }
  [data-piece="proof"].pf-pause p > span:not(.pf-pause-sep) { display: block; }
  [data-piece="proof"] .pf-pause-sep { display: none; }

  [data-piece="proof"] .pf-row { grid-template-columns: minmax(0, 1fr); padding-block: 18px; }
  /* separators sit left of every item; the one that starts a line is clipped away */
  [data-piece="proof"] .pf-row ul { justify-content: flex-start; margin-left: -13px; overflow: hidden; }
  [data-piece="proof"] .pf-row li { font-size: 1.1875rem; margin-left: -1px; padding-inline: 12px; border-left: 1px solid var(--band-rule); }
  [data-piece="proof"] .pf-row li + li::before { content: none; }
  [data-piece="proof"] .pf-names { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  [data-piece="proof"] .pf-also { grid-template-columns: minmax(0, 1fr); }
}