.page-about {
  background:
    radial-gradient(ellipse at 90% 8%, rgba(57, 255, 20, 0.06) 0%, transparent 32%),
    var(--primary-dark);
  color: var(--text-main);
  padding-bottom: 72px;
}

.page-about__crumbs {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 16px 20px 0;
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about__crumbs a {
  color: var(--accent-green);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about__crumbs a:hover {
  color: var(--text-main);
}

.page-about__hero {
  position: relative;
  padding: 40px 0 0;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-green));
}

.page-about__hero-inner {
  max-width: 820px;
}

.page-about__kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent-green);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.page-about__hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 8vw, 4.4rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.015em;
  margin: 0 0 16px;
}

.page-about__hero-mark {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-left: 10px;
  background: var(--accent-green);
  border-radius: 3px 0 3px 0;
  box-shadow: 0 0 18px rgba(57, 255, 20, 0.5);
}

.page-about__lede {
  max-width: 680px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-muted);
  margin: 0 0 28px;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__hero-img {
  display: block;
  width: 100%;
  max-width: var(--container-w);
  height: auto;
  margin: 40px auto 0;
  border-radius: 12px 0 16px 0;
  box-shadow: 0 24px 60px rgba(5, 16, 33, 0.55);
}

.page-about__section {
  margin-top: 72px;
}

.page-about__section-note {
  margin: 10px 0 0;
  color: var(--text-muted);
  font-size: 0.86rem;
  line-height: 1.6;
  max-width: 560px;
}

.page-about__timeline {
  margin-top: 40px;
}

.page-about__tl-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  grid-template-areas:
    "meta meta"
    "node card";
  gap: 10px 16px;
  position: relative;
  padding-bottom: 32px;
}

.page-about__tl-item::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 80px;
  bottom: 0;
  width: 2px;
  border-left: 2px dashed var(--line);
}

.page-about__tl-item:last-child::before {
  display: none;
}

.page-about__tl-meta {
  grid-area: meta;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about__tl-version {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-about__tl-version--current {
  color: var(--accent-orange);
}

.page-about__tl-era {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.75;
}

.page-about__tl-node {
  grid-area: node;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-green);
  background: var(--primary-light);
  border: 2px dashed var(--accent-green);
  box-shadow: 0 0 0 6px rgba(57, 255, 20, 0.08), 0 0 22px rgba(57, 255, 20, 0.14);
  position: relative;
  z-index: 2;
}

.page-about__tl-item--current .page-about__tl-node {
  color: var(--primary-dark);
  background: var(--accent-green);
  border-style: solid;
  box-shadow: 0 0 0 6px rgba(57, 255, 20, 0.18), 0 0 34px rgba(57, 255, 20, 0.35);
}

.page-about__tl-card {
  grid-area: card;
  border: 1px solid var(--line);
}

.page-about__tl-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.page-about__tl-card h3 {
  font-family: var(--font-headline);
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

.page-about__tl-card p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about__tl-item--current .page-about__tl-card {
  border-color: rgba(57, 255, 20, 0.45);
  box-shadow: inset 0 0 0 1px rgba(57, 255, 20, 0.12), 0 18px 44px rgba(5, 16, 33, 0.45);
}

.page-about__compare-grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
  align-items: center;
}

.page-about__compare-card {
  position: relative;
  padding: 28px 20px 24px;
  border: 1px solid var(--line);
}

.page-about__compare-card--old {
  background: linear-gradient(160deg, #1F2A3C, #16202E);
}

.page-about__compare-card--new {
  border-color: rgba(57, 255, 20, 0.5);
  background: linear-gradient(160deg, rgba(57, 255, 20, 0.10), rgba(10, 31, 68, 0.95) 48%);
  box-shadow: inset 0 0 0 1px rgba(57, 255, 20, 0.10), 0 0 44px rgba(57, 255, 20, 0.08);
}

.page-about__compare-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about__tag--muted {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border: 1px solid var(--line);
}

.page-about__compare-step {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  color: #5C6B84;
}

.page-about__compare-step--new {
  color: var(--accent-green);
  text-shadow: 0 0 26px rgba(57, 255, 20, 0.45);
}

.page-about__compare-card img {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto 22px;
  border-radius: 10px;
  box-shadow: 0 18px 44px rgba(5, 16, 33, 0.5);
}

.page-about__compare-card--old img {
  filter: grayscale(0.85) contrast(0.95);
}

.page-about__step-list {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about__step-list li {
  counter-increment: step;
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 0.86rem;
  line-height: 1.45;
  color: var(--text-muted);
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.02);
  border-left: 2px solid var(--line);
}

.page-about__step-list li::before {
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  padding: 3px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}

.page-about__compare-card--new .page-about__step-list li {
  border-left-color: var(--accent-green);
  color: var(--text-main);
}

.page-about__compare-card--new .page-about__step-list li::before {
  color: var(--accent-green);
  border-color: rgba(57, 255, 20, 0.35);
  background: rgba(57, 255, 20, 0.08);
}

.page-about__compare-arrow {
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 2rem;
  color: var(--accent-green);
}

.page-about__compare-arrow span {
  display: inline-block;
  transform: rotate(90deg);
}

.page-about__compare-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.page-about__compare-card--new .page-about__compare-note {
  border-top-color: rgba(57, 255, 20, 0.25);
}

.page-about__archive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 36px;
}

.page-about__archive-card {
  transition: transform 0.3s var(--ease);
}

.page-about__archive-card:hover {
  transform: translateY(-4px);
}

.page-about__archive-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  background: linear-gradient(160deg, rgba(22, 51, 107, 0.55), rgba(10, 31, 68, 0.92));
  border: 1px solid var(--line);
}

.page-about__archive-version {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text-muted);
  display: block;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.page-about__archive-card h3 {
  font-family: var(--font-headline);
  font-size: 1.12rem;
  font-weight: 700;
  text-transform: uppercase;
  margin: 0 0 8px;
}

.page-about__archive-card p {
  margin: 0 0 18px;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-muted);
  flex-grow: 1;
}

.page-about__archive-card .btn {
  align-self: flex-start;
}

.page-about__archive-card--featured .page-about__archive-inner {
  border-color: rgba(57, 255, 20, 0.45);
  background:
    radial-gradient(circle at 90% 10%, rgba(57, 255, 20, 0.14), transparent 45%),
    linear-gradient(160deg, rgba(22, 51, 107, 0.7), rgba(10, 31, 68, 0.95));
}

.page-about__archive-card--featured .page-about__archive-version {
  color: var(--accent-green);
  text-shadow: 0 0 22px rgba(57, 255, 20, 0.4);
}

.page-about__milestone-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 36px;
}

.page-about__milestone-item {
  padding: 20px 16px;
  border: 1px solid var(--line);
}

.page-about__milestone-item .data-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent-green);
  margin-bottom: 10px;
}

.page-about__milestone-label {
  font-family: var(--font-headline);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0 0 6px;
  color: var(--text-main);
}

.page-about__milestone-desc {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.page-about__promise-inner {
  position: relative;
  overflow: hidden;
  padding: 36px 22px;
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.10), transparent 55%),
    var(--primary);
  border: 1px solid rgba(57, 255, 20, 0.2);
}

.page-about__promise-inner::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 180px;
  height: 180px;
  border: 2px dashed rgba(255, 106, 0, 0.3);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__promise-inner .section-head {
  margin-bottom: 8px;
}

.page-about__promise-quote {
  margin: 28px 0 22px;
  padding: 0 0 0 18px;
  border-left: 4px solid var(--accent-green);
}

.page-about__promise-quote p {
  font-family: var(--font-headline);
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
  text-transform: uppercase;
  color: var(--text-main);
  margin: 0;
}

.page-about__promise-body {
  margin: 0;
  max-width: 680px;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about__promise-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  position: relative;
  z-index: 1;
}

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 100px;
  }

  .page-about__hero {
    padding-top: 56px;
  }

  .page-about__tl-item {
    grid-template-columns: 160px 60px 1fr;
    grid-template-areas: "meta node card";
    gap: 0 28px;
    align-items: start;
    padding-bottom: 40px;
  }

  .page-about__tl-meta {
    justify-content: flex-end;
    text-align: right;
    padding-top: 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
  }

  .page-about__tl-node {
    width: 60px;
    height: 60px;
    font-size: 0.85rem;
  }

  .page-about__tl-item::before {
    left: 217px;
    top: 64px;
  }

  .page-about__compare-grid {
    grid-template-columns: 1fr 56px 1fr;
    gap: 28px;
  }

  .page-about__compare-arrow span {
    transform: none;
  }

  .page-about__compare-card {
    display: grid;
    grid-template-columns: 240px 1fr;
    grid-template-rows: auto auto auto;
    column-gap: 26px;
    row-gap: 0;
    align-items: center;
    padding: 30px 26px;
  }

  .page-about__compare-label {
    grid-column: 1 / -1;
    grid-row: 1;
    margin-bottom: 16px;
  }

  .page-about__compare-card img {
    grid-column: 1;
    grid-row: 2 / 4;
    margin: 0;
    max-width: 100%;
  }

  .page-about__step-list {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about__compare-note {
    grid-column: 2;
    grid-row: 3;
    margin-top: 14px;
  }

  .page-about__archive-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about__milestone-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about__promise-inner {
    padding: 52px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}