.page-about {
  --ab-deep: #0f1b26;
  --ab-deep-soft: #17252f;
  --ab-muted: #5e6e7e;
  --ab-orange-deep: #c85a00;
  --ab-green-deep: #0f7b43;
  --ab-violet-deep: #6b2d8f;
  --ab-line: rgba(255, 255, 255, .18);
}

.page-about {
  background:
    linear-gradient(0deg, rgba(44, 62, 80, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 62, 80, .025) 1px, transparent 1px),
    var(--bg-page);
  background-size: 22px 22px, 22px 22px, auto;
}

.page-about [id] {
  scroll-margin-top: 96px;
}

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

.page-about figure {
  margin: 0;
}

.page-about ol,
.page-about ul {
  margin: 0;
  padding: 0;
}

.page-about .page-about__head {
  background: linear-gradient(135deg, #101c26 0%, #1e3a3a 72%, #0f6b4f 130%);
  color: var(--text-inverse);
  padding: 30px 0 28px;
  margin-bottom: 28px;
  border-radius: 0 0 32px 32px;
}

.page-about .page-about__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--accent);
}

.page-about .page-about__head h1 {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 900;
  line-height: 1.2;
  max-width: 860px;
}

.page-about .page-about__lead {
  margin: 0 0 20px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .88);
  max-width: 860px;
}

.page-about .page-about__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .page-about__facts li {
  background: rgba(255, 255, 255, .13);
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 999px;
  color: var(--text-inverse);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .page-about__facts strong {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .page-about__shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding-bottom: 56px;
}

.page-about .page-about__side {
  background: var(--bg-card);
  border-top: 6px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .page-about__side-title {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: .05em;
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.page-about .page-about__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .page-about__nav a,
.page-about .page-about__side-links a {
  display: block;
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-primary);
  border-radius: 999px;
  text-decoration: none;
  background: #ffffff;
  border: 1px solid var(--border);
}

.page-about .page-about__nav a:hover,
.page-about .page-about__side-links a:hover,
.page-about .page-about__nav a[aria-current="true"],
.page-about .page-about__nav a.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--text-primary);
  font-weight: 700;
}

.page-about .page-about__side-links a {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  padding: 6px 0;
}

.page-about .page-about__main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .page-about__section {
  border-radius: 28px;
  padding: 26px 20px;
  box-shadow: var(--shadow);
}

.page-about .page-about__section .section__head {
  margin-bottom: 16px;
}

.page-about .page-about__scope {
  background: linear-gradient(135deg, #ff8c42 0%, #f5a364 46%, #ee7e2e 100%);
  color: var(--text-inverse);
}

.page-about .page-about__scope .section__title {
  color: var(--text-inverse);
}

.page-about .page-about__scope-grid {
  display: grid;
  gap: 16px;
  margin: 20px 0 16px;
}

.page-about .page-about__scope-fig img {
  border-radius: 18px;
  width: 100%;
  object-fit: cover;
  box-shadow: 0 12px 24px rgba(120, 60, 0, .16);
}

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

.page-about .page-about__scope-card {
  background: rgba(255, 255, 255, .95);
  border-radius: 18px;
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, .12);
  color: var(--text-primary);
}

.page-about .page-about__scope-zone {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
}

.page-about .page-about__scope-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
}

.page-about .page-about__scope-caption {
  font-size: 13px;
  color: var(--ab-muted);
}

.page-about .page-about__scope-card--zone1 { border-top: 6px solid var(--bg-zone-1); }
.page-about .page-about__scope-card--zone2 { border-top: 6px solid var(--bg-zone-2); }
.page-about .page-about__scope-card--zone3 { border-top: 6px solid var(--bg-zone-3); }
.page-about .page-about__scope-card--total { border-top: 6px solid var(--accent); }

.page-about .page-about__scope-desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  background: rgba(255, 255, 255, .92);
  color: var(--text-primary);
  border-radius: 18px;
  padding: 14px 18px;
}

.page-about .page-about__zones {
  background: var(--bg-card);
}

.page-about .page-about__zones-intro {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
}

.page-about .page-about__zone-group {
  border-radius: 20px;
  padding: 18px;
  margin-bottom: 16px;
}

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

.page-about .page-about__zone-group--zone1 {
  background: var(--bg-zone-1);
}

.page-about .page-about__zone-group--zone2 {
  background: var(--bg-zone-2);
}

.page-about .page-about__zone-group--zone3 {
  background: var(--bg-zone-3);
}

.page-about .page-about__zone-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.page-about .page-about__zone-name {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-inverse);
}

.page-about .page-about__zone-count {
  font-family: var(--font-mono);
  font-size: 13px;
  background: #ffffff;
  color: var(--text-primary);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 700;
}

.page-about .page-about__zone-group .tag {
  background: rgba(255, 255, 255, .92);
  color: var(--text-primary);
}

.page-about .page-about__zone-group--zone1 .tag {
  border: 1px solid #ffb68c;
}

.page-about .page-about__zone-group--zone2 .tag {
  border: 1px solid #83deac;
}

.page-about .page-about__zone-group--zone3 .tag {
  border: 1px solid #c9a5db;
}

.page-about .page-about__updates {
  background: linear-gradient(135deg, var(--ab-deep-soft) 0%, var(--ab-deep) 100%);
  color: var(--text-inverse);
}

.page-about .page-about__updates .section__title {
  color: var(--text-inverse);
}

.page-about .page-about__timeline {
  list-style: none;
  margin-top: 4px;
}

.page-about .page-about__timeline-item {
  position: relative;
  padding: 0 0 24px 28px;
}

.page-about .page-about__timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 215, 0, .2);
}

.page-about .page-about__timeline-item::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 26px;
  bottom: -2px;
  width: 2px;
  background: var(--ab-line);
}

.page-about .page-about__timeline-item:last-child::after {
  display: none;
}

.page-about .page-about__timeline-badge {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .page-about__timeline-desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .85);
}

.page-about .page-about__timeline-desc a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-about .page-about__version {
  background: linear-gradient(135deg, var(--bg-zone-3) 0%, var(--ab-violet-deep) 100%);
  color: var(--text-inverse);
}

.page-about .page-about__version .section__title {
  color: var(--text-inverse);
}

.page-about .page-about__version-grid {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .page-about__version-fig img {
  border-radius: 18px;
  width: 100%;
  max-width: 260px;
  box-shadow: 0 12px 28px rgba(70, 20, 100, .3);
}

.page-about .page-about__version-cards {
  display: grid;
  gap: 12px;
}

.page-about .page-about__version-card {
  background: rgba(255, 255, 255, .92);
  color: var(--text-primary);
  border-radius: 18px;
  padding: 16px 18px;
}

.page-about .page-about__version-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  color: var(--ab-muted);
  margin-bottom: 4px;
}

.page-about .page-about__version-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--ab-violet-deep);
}

.page-about .page-about__version-text {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .page-about__search {
  background: #fff8e7;
  border: 2px solid var(--accent);
}

.page-about .page-about__search-grid {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .page-about__search-steps ol {
  list-style: none;
  counter-reset: ab-step;
  display: grid;
  gap: 10px;
}

.page-about .page-about__search-steps li {
  counter-increment: ab-step;
  position: relative;
  padding: 12px 14px 12px 46px;
  background: var(--bg-card);
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

.page-about .page-about__search-steps li::before {
  content: counter(ab-step);
  position: absolute;
  left: 10px;
  top: 12px;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: var(--text-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.page-about .page-about__search-steps a,
.page-about .page-about__search-note a {
  color: var(--ab-green-deep);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-about .page-about__search-note {
  margin: 16px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
}

.page-about .page-about__search-fig img {
  border-radius: 18px;
  width: 100%;
  object-fit: cover;
  box-shadow: var(--shadow);
}

@media (min-width: 640px) {
  .page-about .page-about__head {
    padding: 44px 0 40px;
    margin-bottom: 36px;
  }

  .page-about .page-about__head h1 {
    font-size: 34px;
  }

  .page-about .page-about__scope-grid {
    grid-template-columns: 300px 1fr;
    align-items: center;
  }

  .page-about .page-about__scope-cards {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .page-about__scope-fig img {
    height: 200px;
    object-fit: cover;
  }

  .page-about .page-about__version-grid {
    grid-template-columns: 220px 1fr;
    align-items: center;
  }

  .page-about .page-about__version-fig img {
    width: 220px;
    height: 220px;
    object-fit: cover;
  }

  .page-about .page-about__search-grid {
    grid-template-columns: 1fr 360px;
    align-items: center;
  }

  .page-about .page-about__search-fig img {
    width: 360px;
    height: 300px;
    object-fit: cover;
  }
}

@media (min-width: 992px) {
  .page-about .page-about__shell {
    grid-template-columns: 260px 1fr;
    gap: 40px;
  }

  .page-about .page-about__side {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .page-about__nav {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .page-about__nav a {
    text-align: left;
  }

  .page-about .page-about__zone-group {
    padding: 22px;
  }

  .page-about .page-about__zone-group .tag-list {
    gap: 10px;
  }

  .page-about .page-about__section {
    padding: 32px 28px;
  }
}