.page-about {
  --about-rail: 2.5rem;
  --about-gap: 1rem;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 6vw, 56px) 0 clamp(30px, 5vw, 52px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(36, 53, 45, 0.45) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(36, 53, 45, 0.35) 0 1px, transparent 1px 56px);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .hero-slant {
  position: absolute;
  top: -12%;
  right: -18%;
  width: min(520px, 74vw);
  height: 132%;
  background: linear-gradient(158deg, rgba(59, 240, 192, 0.14), rgba(15, 59, 49, 0.92) 62%, rgba(5, 16, 12, 0.6));
  border-left: 1px solid var(--line);
  transform: skewX(-7deg);
  pointer-events: none;
}

.page-about .hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .hero-inner .breadcrumb {
  margin-bottom: clamp(18px, 4vw, 34px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 8.4vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  margin: 0.5rem 0 0;
  max-width: 16em;
}

.page-about .hero-lede {
  margin: 1rem 0 0;
  max-width: 38em;
  color: var(--dim);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .hero-facts {
  list-style: none;
  margin: clamp(24px, 5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fact {
  background: var(--ink);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .fact-num {
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.1;
  color: var(--text);
}

.page-about .fact:first-child .fact-num {
  color: var(--cyan);
}

.page-about .fact:last-child .fact-num {
  color: var(--amber);
}

.page-about .fact-label {
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.02em;
}

.page-about .frame-index {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .frame-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  color: var(--dim);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .frame-link:hover,
.page-about .frame-link:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
  background: var(--panel);
  outline: none;
}

.page-about .frame-num {
  font-size: 11px;
  color: var(--amber);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: clamp(24px, 5vw, 52px) 0 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--about-rail) / 2 - 0.5px);
  width: 1px;
  background: var(--line);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  padding-bottom: clamp(32px, 6vw, 62px);
}

.page-about .tl-rail {
  display: flex;
  justify-content: center;
}

.page-about .tl-num {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--ink);
  border: 1px solid var(--line);
  color: var(--dim);
  font-size: 12px;
  letter-spacing: 0.04em;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .tl-num::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  width: 6px;
  height: 6px;
  background: var(--amber);
}

.page-about .tl-item:target .tl-num,
.page-about .tl-item:hover .tl-num {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .tl-item:target .tl-title {
  color: var(--cyan);
}

.page-about .tl-body {
  min-width: 0;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0.45rem 0 0.85rem;
  transition: color var(--t) var(--ease);
}

.page-about .tl-text {
  margin: 0 0 0.85rem;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.8;
  max-width: 38em;
}

.page-about .tl-fig {
  margin: 1.4rem 0 0;
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--teal);
  transition: border-color var(--t) var(--ease);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  transition: transform var(--t) var(--ease);
}

.page-about .media-caption {
  display: inline-block;
  margin-top: 0.55rem;
  font-size: 12px;
  color: var(--dim);
  border-left: 2px solid var(--line);
  padding-left: 0.55rem;
  transition: color var(--t) var(--ease), transform var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .tl-fig:hover .media-frame {
  border-color: var(--cyan);
}

.page-about .tl-fig:hover .media-caption {
  color: var(--text);
  border-color: var(--amber);
  transform: translateX(4px);
}

.page-about .step-list {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .step {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 1rem 1.05rem 1.1rem;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .step:hover {
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .step-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.page-about .step-head {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin: 0.65rem 0 0.5rem;
}

.page-about .step-text {
  margin: 0 0 0.85rem;
  font-size: 14px;
  line-height: 1.78;
  color: var(--dim);
}

.page-about .step-link {
  display: inline-block;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .step-link:hover,
.page-about .step-link:focus-visible {
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-about .ratio {
  margin: 1.5rem 0 1.6rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .ratio-row + .ratio-row {
  margin-top: 0.9rem;
}

.page-about .ratio-top {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 13px;
  color: var(--dim);
}

.page-about .ratio-top .mono {
  color: var(--text);
}

.page-about .ratio-track {
  height: 6px;
  margin-top: 0.4rem;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .ratio-fill {
  height: 100%;
}

.page-about .fill-edit {
  width: 42.86%;
  background: var(--cyan);
}

.page-about .fill-tag {
  width: 32.14%;
  background: var(--amber);
}

.page-about .fill-prod {
  width: 25%;
  background: var(--dim);
}

.page-about .shift {
  margin: 1.4rem 0 1.5rem;
  border-top: 1px solid var(--line);
}

.page-about .shift-row {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .shift-time {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .shift-head {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 0.25rem;
}

.page-about .shift-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--dim);
}

.page-about .network-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 1.3rem;
}

.page-about .network-card {
  border: 1px solid var(--line);
  border-left: 2px solid var(--amber);
  background: var(--panel);
  padding: 1rem 1.05rem 1.15rem;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .network-card:hover {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .network-big {
  display: block;
  font-size: 40px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .network-head {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  margin: 0.6rem 0 0.4rem;
}

.page-about .network-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--dim);
}

.page-about .ver {
  border: 1px solid var(--line);
  background: var(--panel);
  margin-bottom: 0.55rem;
  transition: border-color var(--t) var(--ease);
}

.page-about .ver:hover,
.page-about .ver[open] {
  border-color: var(--cyan);
}

.page-about .ver summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.85rem 1rem;
  transition: background-color var(--t) var(--ease);
}

.page-about .ver summary::-webkit-details-marker {
  display: none;
}

.page-about .ver summary::after {
  content: "+";
  margin-left: auto;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
}

.page-about .ver[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .ver-tag {
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.page-about .ver-name {
  font-size: 15px;
  color: var(--text);
  line-height: 1.5;
}

.page-about .ver-body {
  padding: 0 1rem 0.95rem;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim);
  border-top: 1px solid var(--line);
  margin-top: 0;
  padding-top: 0.8rem;
}

.page-about .ridge-wrap {
  margin-top: 1.4rem;
  border-top: 1px solid var(--line);
  padding-top: 0.8rem;
}

.page-about .ridge {
  display: block;
  width: 100%;
  height: clamp(70px, 12vw, 130px);
}

.page-about .ridge path {
  fill: var(--teal);
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .ridge circle {
  fill: var(--cyan);
}

.page-about .about-cta {
  margin: clamp(8px, 3vw, 28px) 0 clamp(48px, 8vw, 86px);
  padding: clamp(22px, 5vw, 44px);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(15, 59, 49, 0.62), rgba(11, 20, 17, 0.94) 72%);
}

.page-about .cta-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.15;
  margin: 0.5rem 0 0.6rem;
}

.page-about .cta-text {
  margin: 0 0 1.4rem;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.8;
  max-width: 38em;
}

.page-about .cta-links {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .cta-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  background: rgba(5, 16, 12, 0.5);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .cta-link .mono {
  color: var(--cyan);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--cyan);
  transform: translateX(4px);
  outline: none;
}

@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .step-list {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .page-about .shift-row {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }

  .page-about .network-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .cta-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about {
    --about-rail: 4.5rem;
    --about-gap: 2rem;
  }

  .page-about .tl-num {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 13px;
  }

  .page-about .tl-body--split {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .tl-body--split .tl-fig {
    margin-top: 0.6rem;
  }

  .page-about .tl-fig--inline {
    max-width: 760px;
  }

  .page-about .cta-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .step:hover,
  .page-about .network-card:hover,
  .page-about .cta-link:hover,
  .page-about .cta-link:focus-visible,
  .page-about .tl-fig:hover .media-caption {
    transform: none;
  }

  .page-about .step,
  .page-about .network-card,
  .page-about .cta-link,
  .page-about .media-frame img,
  .page-about .media-caption,
  .page-about .tl-num,
  .page-about .tl-title {
    transition: none;
  }
}
<<<END>>>