/* COMPUTE — from watts to wisdom */

.compute-hero {
  padding-bottom: 0;
  background:
    radial-gradient(circle at 87% 20%, rgba(255, 77, 18, 0.15), transparent 24%),
    linear-gradient(180deg, #090806 0%, #0d0b08 100%);
}

.compute-hero::before {
  content: "STACK";
  position: absolute;
  top: 2.6rem;
  right: -0.04em;
  color: transparent;
  font-size: clamp(9rem, 20vw, 22rem);
  font-weight: 900;
  line-height: 0.8;
  letter-spacing: -0.08em;
  -webkit-text-stroke: 1px rgba(241, 237, 228, 0.045);
  pointer-events: none;
}

.compute-hero .wrap {
  position: relative;
  z-index: 2;
}

.compute-title {
  font-size: clamp(3.6rem, 7.4vw, 8.2rem);
}

.compute-hero__scan {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.compute-hero__scan::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 28%;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(255, 77, 18, 0.35) 22%,
    rgba(255, 77, 18, 0.1) 60%,
    transparent
  );
  animation: computeScan 9s var(--ease-in-out) infinite;
}

@keyframes computeScan {
  0% {
    transform: translateX(-18vw);
    opacity: 0;
  }
  25% {
    opacity: 0.7;
  }
  75% {
    opacity: 0.7;
  }
  100% {
    transform: translateX(66vw);
    opacity: 0;
  }
}

.compute-specs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(3rem, 6vw, 6rem);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.compute-spec {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: clamp(9rem, 13vw, 12rem);
  padding: clamp(1.2rem, 2vw, 1.8rem);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.compute-spec__index {
  position: absolute;
  top: 1.1rem;
  right: 1.1rem;
  color: rgba(241, 237, 228, 0.3);
  font-size: 0.52rem;
  letter-spacing: 0.12em;
}

.compute-spec b {
  color: var(--bone);
  font-size: clamp(2rem, 3.2vw, 3.25rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
}

.compute-spec b sup {
  color: var(--orange);
  font-size: 0.45em;
  vertical-align: super;
}

.compute-spec b span {
  color: var(--muted);
  font-size: 0.32em;
  font-weight: 500;
  letter-spacing: 0;
}

.compute-spec p {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.56rem;
  line-height: 1.55;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* interactive stack */

.stack-section {
  position: relative;
  padding: clamp(5rem, 9vw, 9rem) var(--gutter);
  background:
    radial-gradient(circle at 18% 45%, rgba(255, 77, 18, 0.045), transparent 26%),
    #0b0a07;
  border-top: 1px solid var(--line);
}

.stack-section .wrap {
  width: min(var(--max), 100%);
}

.stack-section .section-title em {
  color: var(--orange);
}

.stack-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(24rem, 0.88fr);
  gap: clamp(2rem, 4vw, 5rem);
  align-items: stretch;
  margin-top: clamp(2rem, 4vw, 4rem);
}

.stack-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 1.2rem 1.2rem 1rem;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 52%, rgba(255, 77, 18, 0.08), transparent 35%),
    linear-gradient(rgba(241, 237, 228, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(241, 237, 228, 0.025) 1px, transparent 1px),
    rgba(9, 8, 6, 0.72);
  background-size: auto, 36px 36px, 36px 36px, auto;
}

.stack-stage::before,
.stack-stage::after {
  content: "";
  position: absolute;
  z-index: 2;
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.stack-stage::before {
  top: 8px;
  left: 8px;
  border-top: 1px solid rgba(255, 77, 18, 0.65);
  border-left: 1px solid rgba(255, 77, 18, 0.65);
}

.stack-stage::after {
  right: 8px;
  bottom: 8px;
  border-right: 1px solid rgba(255, 77, 18, 0.65);
  border-bottom: 1px solid rgba(255, 77, 18, 0.65);
}

.stack-stage__meta,
.stack-stage__foot {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.51rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.stack-stage__foot {
  margin-top: auto;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
}

.stack-stage__foot span:last-child {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--bone);
}

.stack-svg {
  width: 100%;
  height: auto;
  margin-block: auto;
  overflow: visible;
}

.stack-plate {
  cursor: pointer;
  transition: opacity 0.35s ease;
}

.plate-top {
  fill: rgba(241, 237, 228, 0.055);
  stroke: rgba(241, 237, 228, 0.42);
  stroke-width: 1;
  transition: fill 0.4s var(--ease), stroke 0.4s var(--ease);
}

.plate-side {
  fill: rgba(241, 237, 228, 0.035);
  stroke: rgba(241, 237, 228, 0.24);
  stroke-width: 1;
  transition: fill 0.4s var(--ease), stroke 0.4s var(--ease);
}

.plate-label {
  fill: rgba(241, 237, 228, 0.82);
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-anchor: middle;
  transition: fill 0.4s var(--ease);
  pointer-events: none;
}

.plate-sub {
  fill: rgba(241, 237, 228, 0.46);
  font-family: var(--sans);
  font-size: 7px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-anchor: middle;
  transition: fill 0.4s var(--ease);
  pointer-events: none;
}

.plate-led {
  fill: var(--orange);
  opacity: 0.55;
  transition: fill 0.4s ease, opacity 0.4s ease;
}

.stack-plate:hover .plate-top {
  fill: rgba(255, 77, 18, 0.12);
  stroke: rgba(255, 119, 72, 0.75);
}

.stack-plate.is-active .plate-top {
  fill: var(--orange);
  stroke: #ff8a5f;
  filter: drop-shadow(0 0 14px rgba(255, 77, 18, 0.45));
}

.stack-plate.is-active .plate-side {
  fill: rgba(216, 58, 5, 0.42);
  stroke: rgba(255, 119, 72, 0.6);
}

.stack-plate.is-active .plate-label {
  fill: var(--ink);
}

.stack-plate.is-active .plate-sub {
  fill: rgba(9, 8, 6, 0.62);
}

.stack-plate.is-active .plate-led {
  fill: var(--ink);
  opacity: 0.7;
}

.stack-beam {
  fill: none;
  stroke: rgba(255, 77, 18, 0.25);
  stroke-width: 1;
  stroke-dasharray: 2 6;
}

.stack-beam__node {
  fill: var(--orange);
  filter: drop-shadow(0 0 7px rgba(255, 77, 18, 0.9));
}

.stack-axis-label {
  fill: rgba(241, 237, 228, 0.27);
  font-family: var(--sans);
  font-size: 6px;
  letter-spacing: 0.16em;
}

.stack-console {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-top: 1px solid var(--line);
}

.stack-tabs {
  display: flex;
  flex-direction: column;
}

.stack-tab {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 0.95rem 1rem;
  border-bottom: 1px solid var(--line);
  color: rgba(241, 237, 228, 0.58);
  text-align: left;
  transition: background 0.35s var(--ease), color 0.35s var(--ease), padding 0.35s var(--ease);
}

.stack-tab__code {
  color: var(--orange);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  transition: color 0.35s ease;
}

.stack-tab__name {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1.7vw, 1.55rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.stack-tab__name small {
  color: rgba(241, 237, 228, 0.28);
  font-family: var(--sans);
  font-size: 0.46rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  transition: color 0.35s ease;
}

.stack-tab__arrow {
  color: var(--orange);
  font-size: 0.9rem;
  opacity: 0;
  transform: translate(-4px, 4px);
  transition: opacity 0.35s ease, transform 0.4s var(--ease), color 0.35s ease;
}

.stack-tab:hover {
  padding-left: 1.4rem;
  color: var(--bone);
}

.stack-tab:hover .stack-tab__arrow {
  opacity: 1;
  transform: translate(0, 0);
}

.stack-tab[aria-selected="true"] {
  background: var(--orange);
  color: var(--ink);
}

.stack-tab[aria-selected="true"] .stack-tab__code,
.stack-tab[aria-selected="true"] .stack-tab__arrow {
  color: var(--ink);
}

.stack-tab[aria-selected="true"] .stack-tab__name small {
  color: rgba(9, 8, 6, 0.56);
}

.stack-tab[aria-selected="true"] .stack-tab__arrow {
  opacity: 1;
  transform: translate(0, 0);
}

.stack-panels {
  flex: 1;
  padding: 1.6rem 1rem 0;
}

.stack-panel h3 {
  max-width: 22em;
  margin: 0.75rem 0 1rem;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.4vw, 2.15rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.025em;
}

.stack-panel > p:not(.stack-panel__kicker) {
  color: var(--muted);
  font-size: 0.79rem;
  line-height: 1.9;
}

.stack-panel__kicker {
  color: var(--orange);
  font-size: 0.52rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.stack-panel ul {
  display: grid;
  gap: 0.45rem;
  margin-top: 1.2rem;
}

.stack-panel li {
  position: relative;
  padding-left: 1rem;
  color: rgba(241, 237, 228, 0.72);
  font-size: 0.74rem;
  line-height: 1.7;
}

.stack-panel li::before {
  content: "";
  position: absolute;
  top: 0.67em;
  left: 0;
  width: 4px;
  height: 4px;
  background: var(--orange);
}

.stack-panel__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.5rem;
  margin-top: 1.4rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
  color: rgba(241, 237, 228, 0.32);
  font-size: 0.47rem;
  letter-spacing: 0.12em;
}

/* engineering */

.engineering {
  padding: clamp(5rem, 9vw, 9rem) var(--gutter);
}

.engineering .wrap {
  width: min(var(--max), 100%);
}

.engineering-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: clamp(2rem, 4vw, 4rem);
  border-top: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
}

.engineering-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: clamp(13rem, 18vw, 17rem);
  padding: clamp(1.4rem, 2.3vw, 2.2rem);
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  transition: background 0.4s var(--ease), color 0.4s ease;
}

.engineering-card > span {
  color: var(--orange-deep);
  font-size: 0.51rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.engineering-card h3 {
  margin-top: auto;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 2.3vw, 2.15rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.engineering-card p {
  max-width: 22rem;
  margin-top: 0.7rem;
  color: var(--muted-dark);
  font-size: 0.76rem;
  line-height: 1.85;
  transition: color 0.4s ease;
}

.engineering-card small {
  margin-top: 1.2rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line-dark);
  color: var(--muted-dark);
  font-size: 0.48rem;
  letter-spacing: 0.1em;
  transition: color 0.4s ease, border-color 0.4s ease;
}

.engineering-card:hover {
  background: var(--ink);
  color: var(--bone);
}

.engineering-card:hover p {
  color: var(--muted);
}

.engineering-card:hover small {
  color: rgba(241, 237, 228, 0.45);
  border-color: var(--line);
}

.engineering-card:hover > span {
  color: var(--orange);
}

/* quote */

.compute-quote {
  position: relative;
  overflow: hidden;
  padding: clamp(4.5rem, 8vw, 8rem) var(--gutter);
  background: var(--paper-deep);
  color: var(--ink);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.compute-quote .wrap {
  width: min(var(--max), 100%);
}

.compute-quote blockquote {
  margin-top: clamp(1rem, 2vw, 2rem);
  font-family: var(--serif);
  font-size: clamp(3rem, 7vw, 7.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
}

.compute-quote blockquote em {
  color: var(--orange-deep);
  font-style: normal;
}

.compute-quote__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-top: clamp(2rem, 4vw, 3.5rem);
  padding-top: 1.4rem;
  border-top: 1px solid var(--line-dark-strong);
}

.compute-quote__foot p {
  max-width: 34rem;
  color: var(--muted-dark);
  font-size: 0.8rem;
  line-height: 1.9;
}

.compute-quote__foot .text-link {
  border-bottom-color: var(--line-dark-strong);
}

/* responsive */

@media (max-width: 1080px) {
  .stack-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .stack-stage {
    max-width: 780px;
    width: 100%;
    margin-inline: auto;
  }

  .stack-tabs {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .stack-tab {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
    padding: 0.9rem 0.7rem;
    min-height: 5.2rem;
  }

  .stack-tab:hover {
    padding-left: 0.7rem;
  }

  .stack-tab__name {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    font-size: 1.05rem;
  }

  .stack-tab__arrow {
    display: none;
  }

  .stack-panels {
    padding-inline: 0;
  }

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

@media (max-width: 820px) {
  .compute-hero::before {
    font-size: 29vw;
    top: 4rem;
  }

  .compute-title {
    font-size: clamp(3.1rem, 11.5vw, 5.4rem);
  }

  .compute-specs {
    grid-template-columns: 1fr 1fr;
    margin-top: 3rem;
  }

  .compute-spec {
    min-height: 8rem;
    padding: 1rem;
  }

  .compute-spec__index {
    top: 0.8rem;
    right: 0.8rem;
  }

  .compute-spec b {
    font-size: 2rem;
  }

  .stack-tabs {
    display: flex;
    flex-direction: row;
    gap: 0;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }

  .stack-tab {
    flex: 0 0 9.5rem;
    scroll-snap-align: start;
    border-right: 1px solid var(--line);
  }

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

  .engineering-card {
    min-height: 0;
  }

  .engineering-card h3 {
    margin-top: 1.2rem;
  }

  .compute-quote__foot {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .stack-section,
  .engineering,
  .compute-quote {
    padding-inline: var(--gutter);
  }

  .stack-stage {
    padding-inline: 0.8rem;
  }

  .stack-stage__meta {
    font-size: 0.43rem;
  }

  .stack-stage__foot {
    font-size: 0.43rem;
  }

  .stack-svg {
    margin-block: 0.2rem;
  }

  .stack-tab {
    flex-basis: 8.3rem;
    min-height: 4.6rem;
  }

  .stack-tab__name {
    font-size: 0.96rem;
  }

  .stack-tab__name small {
    font-size: 0.4rem;
  }

  .stack-panel h3 {
    font-size: 1.55rem;
  }

  .stack-panels {
    padding-top: 1.3rem;
  }

  .compute-specs {
    border-left: 0;
  }

  .compute-spec {
    border-left: 1px solid var(--line);
  }

  .compute-spec p {
    font-size: 0.5rem;
  }

  .compute-quote blockquote {
    font-size: clamp(2.7rem, 12.5vw, 4.2rem);
  }

  .compute-quote__foot p {
    font-size: 0.74rem;
  }
}