.page-about {
  --about-radius: 24px;
  --about-pad: 20px;
}

.page-about .about-hero {
  position: relative;
  padding: 32px 0 48px;
  background-image:
    linear-gradient(rgba(0, 255, 136, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 136, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-breadcrumb {
  margin-bottom: 18px;
}

.page-about .about-breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-breadcrumb a {
  color: var(--text-muted);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color 0.25s var(--ease-out);
}

.page-about .about-breadcrumb a:hover {
  color: var(--neon-green);
}

.page-about .about-breadcrumb li + li::before {
  content: "·";
  color: var(--text-faint);
  font-family: var(--font-mono);
  margin-right: 8px;
}

.page-about .about-breadcrumb [aria-current="page"] {
  color: var(--silver-white);
  font-size: var(--text-sm);
}

.page-about .about-hero__panel {
  position: relative;
  padding: 36px 24px 28px;
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.05), transparent 46%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.page-about .about-hero__beam {
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 3px;
  border-radius: 0 var(--radius-lg) 0 0;
  background: linear-gradient(90deg, transparent, var(--neon-green), var(--vital-orange));
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(42px, 9vw, 74px);
  line-height: 0.92;
  letter-spacing: 0.03em;
  color: var(--silver-white);
}

.page-about .about-hero__subtitle {
  margin: 12px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 38px);
  line-height: 1.1;
  letter-spacing: 0.05em;
  color: var(--neon-green);
}

.page-about .about-hero__lead {
  max-width: 600px;
  margin: 0 0 26px;
  color: var(--text-muted);
  font-size: var(--text-md);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-hero__stat {
  padding: 20px 14px;
  text-align: center;
  background: rgba(5, 11, 26, 0.55);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.page-about .about-hero__stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-green), transparent 80%);
  opacity: 0.7;
}

.page-about .about-hero__stat .stat {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--silver-white);
}

.page-about .about-hero__stat .stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 8px 0 72px;
}

.page-about .about-toc {
  font-size: var(--text-sm);
}

.page-about .about-toc__mobile {
  background: rgba(5, 11, 26, 0.6);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.page-about .about-toc__mobile summary {
  cursor: pointer;
  color: var(--silver-white);
  font-weight: 600;
  font-size: var(--text-md);
  font-family: var(--font-body);
  list-style: none;
}

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

.page-about .about-toc__mobile .about-toc__list {
  margin-top: 14px;
}

.page-about .about-toc__desktop {
  display: none;
  position: sticky;
  top: calc(var(--header-h) + 24px);
  padding: 24px 20px;
  background: rgba(5, 11, 26, 0.6);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
}

.page-about .about-toc__desktop .data-label {
  margin-bottom: 18px;
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: background 0.25s var(--ease-out), color 0.25s var(--ease-out), border-color 0.25s var(--ease-out);
}

.page-about .about-toc__list a:hover {
  background: rgba(0, 255, 136, 0.06);
  color: var(--silver-white);
  border-color: var(--border-soft);
}

.page-about .about-toc__list a span {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--neon-green);
  opacity: 0.85;
}

.page-about .about-toc__tags {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-section {
  position: relative;
  padding: var(--about-pad);
  background: rgba(5, 11, 26, 0.42);
  border: 1px solid var(--border-soft);
  border-radius: var(--about-radius);
  margin-bottom: 20px;
}

.page-about .about-section--warm {
  background: var(--paper-warm);
  border-color: rgba(11, 27, 61, 0.12);
}

.page-about .about-section__head {
  padding-left: 16px;
  border-left: 3px solid var(--neon-green);
  margin-bottom: 22px;
}

.page-about .about-section--warm .about-section__head {
  border-left-color: var(--vital-orange);
}

.page-about .about-section__head .data-label {
  margin-bottom: 10px;
}

.page-about .about-section--warm .data-label {
  color: var(--space-blue);
}

.page-about .about-section--warm .data-label::before {
  opacity: 0.7;
}

.page-about .about-section__head h2 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.05;
  letter-spacing: 0.04em;
  color: var(--silver-white);
}

.page-about .about-section--warm .about-section__head h2 {
  color: var(--space-blue);
}

.page-about .about-section__lead {
  margin: 0;
  font-size: var(--text-md);
  color: var(--text-muted);
}

.page-about .about-section--warm .about-section__lead {
  color: var(--space-blue);
}

.page-about .about-section__text {
  margin: 0 0 14px;
  font-size: var(--text-md);
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-section--warm .about-section__text {
  color: var(--space-blue);
}

.page-about .about-section__text:last-child {
  margin-bottom: 0;
}

.page-about .about-quote {
  margin: 24px 0;
  padding: 18px 24px;
  background: rgba(0, 255, 136, 0.06);
  border-left: 3px solid var(--neon-green);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--silver-white);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: 1.6;
}

.page-about .about-section--warm .about-quote {
  background: rgba(11, 27, 61, 0.06);
  color: var(--space-blue);
}

.page-about .about-value-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-value-card {
  position: relative;
  padding: 24px 20px 20px;
  background: var(--ink-blue);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-value-card::after {
  content: "";
  position: absolute;
  right: -24px;
  top: -24px;
  width: 64px;
  height: 64px;
  border: 12px solid rgba(0, 255, 136, 0.1);
  border-radius: 50%;
}

.page-about .about-value-card__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--neon-green);
  margin-bottom: 10px;
}

.page-about .about-value-card h3 {
  margin: 0 0 8px;
  color: var(--silver-white);
  font-size: var(--text-lg);
}

.page-about .about-value-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-about .about-timeline {
  position: relative;
  margin: 32px 0 36px;
  padding-left: 36px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(var(--neon-green), var(--slate-blue));
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 16px;
  background: var(--ink-blue);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.3s var(--ease-out);
}

.page-about .about-timeline__item[open] {
  border-color: rgba(0, 255, 136, 0.3);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.14);
}

.page-about .about-timeline__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--neon-green);
  line-height: 1;
  transition: transform 0.3s var(--ease-out);
}

.page-about .about-timeline__item[open] .about-timeline__head::after {
  transform: rotate(45deg);
}

.page-about .about-timeline__version {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--neon-green);
  background: rgba(0, 255, 136, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.page-about .about-timeline__name {
  flex: 1 1 100%;
  margin: 0;
  color: var(--silver-white);
  font-size: var(--text-md);
  font-weight: 600;
  min-width: 160px;
}

.page-about .about-timeline__body {
  padding: 0 18px 16px;
}

.page-about .about-timeline__body p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.75;
}

.page-about .about-timeline__figure {
  margin: 28px 0 0;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid rgba(11, 27, 61, 0.1);
}

.page-about .about-timeline__figure figcaption,
.page-about .about-data-flow__figure figcaption,
.page-about .about-quality__figure figcaption {
  margin-top: 10px;
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.page-about .about-section--warm .about-timeline__figure figcaption,
.page-about .about-section--warm .about-quality__figure figcaption {
  color: rgba(11, 27, 61, 0.55);
}

.page-about .about-data-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 28px;
}

.page-about .about-data-flow__svg-wrap {
  padding: 20px 16px;
  background: var(--ink-blue);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
}

.page-about .about-data-flow__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-data-flow__path {
  fill: none;
  stroke: var(--neon-green);
  stroke-width: 1.5;
  stroke-dasharray: 4 5;
  opacity: 0.75;
}

.page-about .about-data-flow__node {
  fill: var(--neon-green);
}

.page-about .about-data-flow__core {
  fill: var(--vital-orange);
}

.page-about .about-data-flow__legend {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-data-flow__figure {
  margin: 0;
}

.page-about .about-data-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-step {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--ink-blue);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: rgba(0, 255, 136, 0.25);
  margin-bottom: 12px;
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  color: var(--silver-white);
  font-size: var(--text-md);
}

.page-about .about-step p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-about .about-quality__figure {
  margin: 28px 0 0;
}

.page-about .about-quality__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid rgba(11, 27, 61, 0.1);
}

.page-about .about-plan-path {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-plan-step {
  flex: 1 1 calc(50% - 10px);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 14px;
  background: rgba(5, 11, 26, 0.6);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  color: var(--silver-white);
  font-size: var(--text-sm);
  font-weight: 600;
}

.page-about .about-plan-step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  flex: none;
  background: rgba(0, 255, 136, 0.1);
  color: var(--neon-green);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  border-radius: 50%;
}

.page-about .about-plan-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-eco-card {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--ink-blue);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
}

.page-about .about-eco-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--vital-orange);
  background: rgba(255, 107, 53, 0.12);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.page-about .about-eco-card h3 {
  margin: 0 0 8px;
  color: var(--silver-white);
  font-size: var(--text-md);
}

.page-about .about-eco-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-about .about-eco-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

@media (min-width: 640px) {
  .page-about .about-hero__panel {
    padding: 44px 36px 32px;
  }

  .page-about .about-value-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .about-plan-step {
    flex: 1 1 calc(25% - 10px);
  }

  .page-about .about-data-flow {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .about-timeline {
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-timeline__item {
    width: calc(50% - 28px);
    margin-left: 0;
  }

  .page-about .about-timeline__item::before {
    right: -32px;
    left: auto;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: calc(50% + 28px);
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    right: auto;
    left: -32px;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__head::after {
    content: "+";
    margin-left: 0;
    margin-right: 0;
  }

  .page-about .about-section {
    padding: 36px 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .about-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-toc__mobile {
    display: none;
  }

  .page-about .about-toc__desktop {
    display: block;
  }

  .page-about .about-section {
    margin-bottom: 24px;
  }

  .page-about .about-timeline__name {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}