.cost-hero {
  background:
    radial-gradient(circle at 78% 26%, rgba(183, 243, 74, 0.12), transparent 22%),
    radial-gradient(circle at 18% 90%, rgba(75, 117, 255, 0.08), transparent 28%),
    linear-gradient(135deg, var(--midnight) 0%, #060a11 100%);
}

.cost-hero :focus-visible,
.proof-section :focus-visible,
.boundary-section :focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--midnight);
}

.cost-trace {
  position: absolute;
  z-index: -1;
  right: -8vw;
  bottom: 12%;
  width: min(50vw, 48rem);
  height: 14rem;
  opacity: 0.32;
  background:
    linear-gradient(155deg, transparent 0 12%, var(--signal) 12.2% 12.7%, transparent 13% 29%, var(--signal) 29.2% 29.7%, transparent 30% 49%, var(--signal) 49.2% 49.7%, transparent 50% 69%, var(--signal) 69.2% 69.7%, transparent 70% 100%);
  filter: drop-shadow(0 0 1.25rem rgba(183, 243, 74, 0.22));
  transform: skewY(-5deg);
}

.cost-window {
  animation: cost-window-enter 820ms 180ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes cost-window-enter {
  from { opacity: 0; transform: translateY(2rem) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.cost-window-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 1.5rem 1rem;
}

.cost-window-head > div:first-child {
  display: grid;
  gap: 0.35rem;
}

.cost-window-head span {
  color: #8f9baa;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cost-window-head strong {
  color: #fff;
  font-size: clamp(2.7rem, 5vw, 4.4rem);
  letter-spacing: -0.07em;
  line-height: 0.9;
}

.cost-window-head strong span {
  margin-left: 0.18rem;
  color: var(--signal);
  font-size: 0.9rem;
  letter-spacing: 0;
}

.sample-tag {
  padding: 0.45rem 0.6rem;
  color: var(--midnight);
  background: var(--signal);
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.reliability-plot {
  display: grid;
  min-height: 13rem;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.75rem;
  padding: 1rem 1.5rem 1.35rem;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  background-image: linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 100% 50%;
}

.plot-scale {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-bottom: 1.8rem;
  color: #778495;
  font: 0.58rem/1 Inter, sans-serif;
}

.plot-bars {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: end;
  gap: clamp(0.65rem, 2.4vw, 1.25rem);
}

.plot-bars > div {
  display: grid;
  height: 100%;
  grid-template-rows: 1fr auto;
  gap: 0.55rem;
  align-items: end;
}

.plot-bars i {
  display: block;
  width: 100%;
  height: var(--value);
  min-height: 0.35rem;
  background: linear-gradient(180deg, var(--signal-bright), #83b82d);
  box-shadow: 0 0 1.2rem rgba(183, 243, 74, 0.15);
  transform-origin: bottom;
  animation: bar-rise 760ms 420ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.plot-bars i.warn {
  background: linear-gradient(180deg, #ffcf67, #c98424);
  box-shadow: none;
}

@keyframes bar-rise {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

.plot-bars span {
  min-height: 1.2rem;
  color: #9da9b7;
  font-size: 0.58rem;
  line-height: 1.25;
  text-align: center;
}

.cost-window-metrics {
  display: grid;
  margin: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--line-dark);
}

.cost-window-metrics div {
  display: grid;
  gap: 0.35rem;
  padding: 1rem;
  border-right: 1px solid var(--line-dark);
}

.cost-window-metrics div:last-child { border-right: 0; }

.cost-window-metrics dt {
  color: #7f8c9c;
  font-size: 0.56rem;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
}

.cost-window-metrics dd {
  margin: 0;
  color: #fff;
  font-size: 0.88rem;
  font-weight: 800;
}

.proof-section {
  background: var(--paper);
}

.proof-ledger {
  margin-top: clamp(3rem, 6vw, 5.5rem);
  border-top: 1px solid var(--line-light);
}

.proof-ledger article {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(1.35rem, 3vw, 2.15rem) 0;
  border-bottom: 1px solid var(--line-light);
  transition: padding-inline 180ms ease, background-color 180ms ease;
}

.proof-ledger article:hover {
  padding-inline: 0.75rem;
  background: #f8faec;
}

.proof-ledger article > span {
  color: #7b8795;
  font: 0.7rem/1 Inter, sans-serif;
  font-weight: 800;
}

.proof-ledger p {
  margin: 0 0 0.35rem;
  color: #718093;
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.proof-ledger h3 {
  margin: 0;
  font-size: clamp(1.1rem, 2vw, 1.55rem);
}

.proof-ledger article > strong {
  color: #4f7906;
  font-size: clamp(0.85rem, 1.4vw, 1rem);
  text-align: right;
}

.proof-links {
  display: flex;
  margin-top: 2rem;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.35rem;
}

.delivery-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(26rem, 1fr);
  gap: clamp(3rem, 9vw, 8rem);
  align-items: start;
}

.delivery-layout > div:first-child {
  position: sticky;
  top: calc(var(--header-height) + 2.5rem);
}

.delivery-layout h2 {
  margin: 0;
  color: #fff;
  font-size: clamp(2.8rem, 5vw, 5rem);
  letter-spacing: -0.06em;
  line-height: 0.95;
}

.delivery-layout > div > p:last-child {
  max-width: 36rem;
  color: #aeb8c6;
  line-height: 1.75;
}

.delivery-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.delivery-steps li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.25rem;
  padding: 1.65rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.delivery-steps li > span {
  color: var(--signal);
  font-size: 0.7rem;
  font-weight: 800;
}

.delivery-steps h3 {
  margin: 0 0 0.4rem;
  color: #fff;
  font-size: 1.15rem;
}

.delivery-steps p {
  margin: 0;
  color: #909baa;
  line-height: 1.6;
}

.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.boundary-columns > div {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  background: #fff;
}

.boundary-columns h3 {
  margin: 0 0 1.2rem;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.boundary-columns ul {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 0.85rem;
  list-style: none;
}

.boundary-columns li {
  position: relative;
  padding-left: 1.15rem;
  color: #526173;
  line-height: 1.55;
}

.boundary-columns li::before {
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  background: var(--signal);
  content: "";
}

.boundary-columns > div:last-child li::before {
  background: #d1d7df;
}

@media (max-width: 920px) {
  .delivery-layout {
    grid-template-columns: 1fr;
  }

  .delivery-layout > div:first-child {
    position: static;
  }
}

@media (max-width: 680px) {
  .cost-trace { display: none; }

  .cost-window-metrics {
    grid-template-columns: 1fr;
  }

  .cost-window-metrics div {
    grid-template-columns: 1fr auto;
    align-items: center;
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
  }

  .cost-window-metrics div:last-child { border-bottom: 0; }

  .proof-ledger article {
    grid-template-columns: 2rem 1fr;
  }

  .proof-ledger article > strong {
    grid-column: 2;
    text-align: left;
  }

  .boundary-columns {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cost-window,
  .plot-bars i {
    animation: none;
  }

  .proof-ledger article {
    transition: none;
  }
}