.page-about {
  background:
    radial-gradient(circle at 88% 6%, rgba(57, 210, 242, 0.08), transparent 28%),
    radial-gradient(circle at 12% 42%, rgba(212, 168, 67, 0.05), transparent 30%),
    linear-gradient(180deg, #0B1D3A 0%, #0B1D3A 100%);
  color: #E8F0FE;
}

.page-about .about-container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding-block: 96px 18px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  color: var(--color-moon);
}

.page-about .about-crumb a {
  color: var(--color-moon);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--color-gold-bright);
}

.page-about .about-crumb__sep {
  color: rgba(212, 168, 67, 0.6);
}

.page-about .about-crumb__tag {
  margin-left: auto;
  color: var(--color-gold);
  background: rgba(212, 168, 67, 0.12);
  border: 1px solid rgba(212, 168, 67, 0.35);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 36px;
  padding-block: clamp(24px, 5vw, 56px) clamp(48px, 8vw, 88px);
}

.page-about .about-hero::before {
  content: "38,000+";
  position: absolute;
  z-index: 0;
  top: -30px;
  right: -10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(7rem, 18vw, 16rem);
  line-height: 1;
  letter-spacing: -0.06em;
  color: rgba(232, 240, 254, 0.03);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__copy,
.page-about .about-hero__visual {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.8rem, 7vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 10px;
  color: var(--color-ice);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--color-gold);
}

.page-about .about-hero__subtitle {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 600;
  margin: 0 0 20px;
  color: var(--color-gold-bright);
  letter-spacing: 0.02em;
}

.page-about .about-hero__lead {
  font-size: 0.9375rem;
  line-height: 1.85;
  max-width: 58ch;
  color: var(--color-moon);
  margin: 0 0 28px;
}

.page-about .about-hero__lead strong {
  color: var(--color-ice);
  font-weight: 600;
}

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

.page-about .about-feature {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  background: rgba(18, 42, 78, 0.72);
  border: 1px solid rgba(212, 168, 67, 0.28);
  border-radius: 18px;
  padding: 10px 18px;
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .about-feature:hover,
.page-about .about-feature:focus-within {
  border-color: var(--color-gold-bright);
  transform: translateY(-2px);
}

.page-about .about-feature__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-gold);
}

.page-about .about-feature__label {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--color-moon);
}

.page-about .about-hero__visual {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.28);
  max-width: 960px;
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(120deg, rgba(11, 29, 58, 0) 60%, rgba(212, 168, 67, 0.18) 61%, rgba(230, 57, 70, 0.08));
  pointer-events: none;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  top: -18px;
  right: 24px;
  width: 120px;
  height: 36px;
  z-index: 2;
  background: linear-gradient(90deg, var(--color-gold), var(--color-red));
  clip-path: polygon(0 0, 100% 0, 92% 100%, 8% 100%);
  pointer-events: none;
}

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

.page-about .about-hero__tag {
  position: absolute;
  left: 16px;
  bottom: 16px;
  z-index: 2;
  display: inline-flex;
  flex-direction: column;
  line-height: 1.35;
  gap: 1px;
  background: rgba(6, 16, 31, 0.72);
  border: 1px solid rgba(212, 168, 67, 0.42);
  border-radius: var(--radius-md);
  padding: 10px 16px;
  color: var(--color-ice);
}

.page-about .about-hero__tag-line {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.page-about .about-hero__tag-main {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
}

.page-about .about-layout {
  display: grid;
  gap: 36px;
  align-items: start;
  padding-bottom: clamp(56px, 8vw, 96px);
}

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

.page-about .about-flow {
  display: grid;
  gap: clamp(56px, 8vw, 88px);
}

.page-about .about-chapter {
  display: grid;
  gap: 22px;
  scroll-margin-top: 96px;
}

.page-about .about-chapter__index {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.page-about .about-chapter__index span {
  color: var(--color-moon);
}

.page-about .about-chapter__index::after {
  content: "";
  width: 64px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold), rgba(212, 168, 67, 0));
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.18;
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--color-ice);
}

.page-about .about-chapter__title em {
  font-style: normal;
  color: var(--color-gold);
}

.page-about .about-chapter__intro p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--color-moon);
  margin: 0 0 14px;
}

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

.page-about .about-chapter__intro strong {
  color: var(--color-ice);
}

.page-about .about-chapter__link {
  margin: 0;
  padding: 14px 18px;
  background: rgba(18, 42, 78, 0.46);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-moon);
  line-height: 1.7;
}

.page-about .about-chapter__link a {
  color: var(--color-gold-bright);
  text-decoration: none;
}

.page-about .about-chapter__link a:hover,
.page-about .about-chapter__link a:focus-visible {
  text-decoration: underline;
}

.page-about .about-dataset__banner {
  padding: 18px 22px;
  background: linear-gradient(120deg, rgba(212, 168, 67, 0.12), transparent 70%), var(--color-navy);
  border-left: 4px solid var(--color-gold);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  color: var(--color-moon);
  line-height: 1.75;
}

.page-about .about-dataset__banner p {
  margin: 0;
}

.page-about .about-dataset__banner strong {
  color: var(--color-gold-bright);
}

.page-about .about-dataset__grid {
  display: grid;
  gap: 14px;
}

.page-about .data-card {
  display: grid;
  gap: 6px;
  position: relative;
  overflow: hidden;
  padding: 20px 20px 22px;
  background: linear-gradient(160deg, rgba(18, 42, 78, 0.9), rgba(11, 29, 58, 0.72));
  border: 1px solid rgba(176, 196, 222, 0.16);
  border-radius: var(--radius-lg);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), background 0.35s var(--ease);
}

.page-about .data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-gold), rgba(212, 168, 67, 0.18));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.45s var(--ease);
}

.page-about .data-card:hover,
.page-about .data-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(242, 201, 76, 0.65);
  background: linear-gradient(160deg, rgba(22, 50, 92, 0.95), rgba(11, 29, 58, 0.85));
}

.page-about .data-card:hover::before,
.page-about .data-card:focus-within::before {
  transform: scaleY(1);
}

.page-about .data-card__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 3vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-gold);
}

.page-about .data-card__label {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-ice);
}

.page-about .data-card__desc {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-moon);
}

.page-about .about-flowline {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: flow;
}

.page-about .about-flowline__item {
  counter-increment: flow;
  position: relative;
  padding: 22px 20px 24px;
  background: var(--color-navy);
  border: 1px solid rgba(176, 196, 222, 0.14);
  border-radius: var(--radius-lg);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about .about-flowline__item::before {
  content: "0" counter(flow);
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-gold);
}

.page-about .about-flowline__item:hover,
.page-about .about-flowline__item:focus-within {
  border-color: var(--color-gold);
  transform: translateY(-3px);
}

.page-about .about-flowline__heading {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-ice);
}

.page-about .about-flowline__text {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--color-moon);
}

.page-about .about-query__note {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-top: 6px;
  padding: 16px 18px;
  background: rgba(230, 57, 70, 0.08);
  border: 1px solid rgba(230, 57, 70, 0.28);
  border-radius: var(--radius-md);
}

.page-about .about-query__note p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-moon);
}

.page-about .about-query__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-red);
}

.page-about .about-versions__media {
  margin-top: 4px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-navy);
}

.page-about .about-versions__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .about-era {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--color-gold), rgba(212, 168, 67, 0.12));
}

.page-about .about-era__item {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 14px 0 14px 34px;
}

.page-about .about-era__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  width: 12px;
  height: 12px;
  background: var(--color-gold);
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
  transition: transform 0.35s var(--ease), background 0.35s var(--ease);
}

.page-about .about-era__item:hover::before,
.page-about .about-era__item:focus-within::before {
  transform: scale(1.25);
  background: var(--color-gold-bright);
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-gold);
}

.page-about .about-era__content h3 {
  display: inline;
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ice);
}

.page-about .about-era__content p {
  display: block;
  margin: 4px 0 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-moon);
}

.page-about .version-note {
  margin-top: 4px;
  overflow: hidden;
  border: 1px solid rgba(212, 168, 67, 0.3);
  border-radius: var(--radius-md);
  background: rgba(6, 16, 31, 0.5);
}

.page-about .version-note summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gold);
  transition: background 0.3s var(--ease);
}

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

.page-about .version-note summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-gold);
  transition: transform 0.35s var(--ease);
}

.page-about .version-note[open] summary::after {
  transform: rotate(45deg);
}

.page-about .version-note summary:hover,
.page-about .version-note summary:focus-visible {
  background: rgba(212, 168, 67, 0.08);
}

.page-about .version-note__body {
  padding: 0 20px 18px;
}

.page-about .version-note__body ul {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 18px;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--color-moon);
}

.page-about .version-note__body a {
  color: var(--color-gold-bright);
  text-decoration: none;
}

.page-about .version-note__body a:hover,
.page-about .version-note__body a:focus-visible {
  text-decoration: underline;
}

.page-about .about-team__grid {
  display: grid;
  gap: 28px;
  margin-top: 4px;
}

.page-about .about-team__copy {
  display: grid;
  gap: 14px;
}

.page-about .about-team__group {
  padding: 14px 16px;
  background: rgba(18, 42, 78, 0.62);
  border-left: 3px solid var(--color-gold);
  border-radius: 12px;
  transition: background 0.3s var(--ease);
}

.page-about .about-team__group:hover,
.page-about .about-team__group:focus-within {
  background: rgba(18, 42, 78, 0.9);
}

.page-about .about-team__name {
  margin: 0 0 4px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-ice);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-moon);
}

.page-about .about-team__foot {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-moon);
}

.page-about .about-team__foot a {
  color: var(--color-gold-bright);
  text-decoration: none;
}

.page-about .about-team__foot a:hover,
.page-about .about-team__foot a:focus-visible {
  text-decoration: underline;
}

.page-about .about-team__media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-navy);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.22);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-metrics__grid {
  display: grid;
  gap: 14px;
  margin-top: 4px;
}

.page-about .metric-card {
  position: relative;
  overflow: hidden;
  padding: 26px 18px 20px;
  text-align: center;
  background: var(--color-navy);
  border: 1px solid rgba(176, 196, 222, 0.15);
  border-radius: var(--radius-lg);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .metric-card:hover,
.page-about .metric-card:focus-within {
  transform: translateY(-4px) scale(1.01);
  border-color: var(--color-gold);
}

.page-about .metric-card__ring {
  position: relative;
  width: 148px;
  height: 148px;
  margin: 0 auto 14px;
}

.page-about .metric-card__ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.page-about .metric-card__track {
  fill: none;
  stroke: rgba(176, 196, 222, 0.14);
  stroke-width: 9;
}

.page-about .metric-card__bar {
  fill: none;
  stroke: var(--color-gold);
  stroke-width: 9;
  stroke-linecap: round;
  transition: stroke 0.35s var(--ease);
}

.page-about .metric-card:hover .metric-card__bar,
.page-about .metric-card:focus-within .metric-card__bar {
  stroke: var(--color-gold-bright);
}

.page-about .metric-card__num {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  line-height: 1;
  text-align: center;
  color: var(--color-ice);
  letter-spacing: -0.02em;
}

.page-about .metric-card__label {
  margin: 0 0 4px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ice);
}

.page-about .metric-card__desc {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--color-moon);
}

.page-about .about-metrics__foot {
  margin-top: 4px;
  padding: 16px 20px;
  background: rgba(230, 57, 70, 0.06);
  border: 1px dashed rgba(230, 57, 70, 0.28);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--color-moon);
}

.page-about .about-metrics__foot p {
  margin: 0;
}

.page-about .about-metrics__foot strong {
  color: var(--color-red);
  font-weight: 700;
}

@media (min-width: 680px) {
  .page-about .about-dataset__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 768px) {
  .page-about .about-era::before {
    left: 122px;
  }

  .page-about .about-era__item {
    grid-template-columns: 110px 1fr;
    gap: 20px;
    padding: 18px 0;
  }

  .page-about .about-era__item::before {
    left: 117px;
    top: 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 44px;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 96px;
    padding: 20px;
    background: rgba(18, 42, 78, 0.5);
    border: 1px solid rgba(212, 168, 67, 0.2);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(6px);
  }

  .page-about .about-index__label {
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--color-gold);
    text-transform: uppercase;
  }

  .page-about .about-index__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
  }

  .page-about .about-index__link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 10px;
    text-decoration: none;
    font-size: 0.85rem;
    color: var(--color-moon);
    transition: color 0.3s var(--ease), background 0.3s var(--ease);
  }

  .page-about .about-index__link span {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: rgba(212, 168, 67, 0.75);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--color-ice);
    background: rgba(212, 168, 67, 0.1);
  }

  .page-about .about-dataset__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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