.page-about {
  --about-num-size: clamp(2rem, 4vw, 3.25rem);
  color: var(--text-main);
  background: var(--page-bg);
}

.page-about .breadcrumb {
  margin: 18px 0 6px;
  font-size: 14px;
  color: var(--text-sub);
}

.page-about .breadcrumb__link {
  color: var(--text-sub);
  text-decoration: none;
}

.page-about .breadcrumb__link.is-active {
  color: var(--accent);
  font-weight: 600;
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--border);
}

.page-about .section-heading {
  margin-bottom: 6px;
}

.page-about .section-heading__title {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: .5px;
}

.page-about .section-heading__subtitle {
  font-size: 14px;
  color: var(--text-sub);
  margin-top: 6px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: 64px;
  padding-top: 48px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -120px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(241, 196, 15, .14) 0%, transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--primary), var(--tag-magenta));
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px 56px;
  align-items: center;
}

.page-about .about-hero__desc {
  margin-top: 24px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-sub);
  max-width: 780px;
}

.page-about .about-hero__emphasis {
  color: var(--accent);
  font-weight: 700;
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-metrics__item {
  background: rgba(30, 42, 58, .72);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  backdrop-filter: blur(4px);
}

.page-about .about-metrics__num {
  display: block;
  font-size: var(--about-num-size);
  font-weight: 900;
  letter-spacing: .5px;
  color: var(--accent);
  line-height: 1.1;
  text-shadow: 0 0 18px rgba(241, 196, 15, .25);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-sub);
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

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

.page-about .about-hero__frame {
  position: relative;
  width: 100%;
  max-width: 660px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--card-bg);
  box-shadow: var(--shadow);
}

.page-about .about-hero__img,
.page-about .about-taxonomy__tree-img,
.page-about .about-updates__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__frame-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: #0B1220;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: .3px;
}

.page-about .about-taxonomy {
  position: relative;
  overflow: hidden;
}

.page-about .about-taxonomy::before {
  content: "";
  position: absolute;
  top: 60px;
  right: -100px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(52, 152, 219, .15) 0%, transparent 65%);
  pointer-events: none;
}

.page-about .about-taxonomy__intro,
.page-about .about-updates__intro,
.page-about .about-contact__intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-sub);
  margin: 18px 0 30px;
  max-width: 900px;
}

.page-about .about-taxonomy__top {
  display: grid;
  gap: 28px;
  margin-bottom: 40px;
}

.page-about .about-taxonomy__tree {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  background: rgba(11, 18, 32, .45);
}

.page-about .about-taxonomy__tree-img {
  border-radius: calc(var(--radius) - 4px);
}

.page-about .about-taxonomy__cards {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .about-taxonomy__card {
  position: relative;
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-top: 3px solid var(--tag-blue);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform .2s, box-shadow .2s;
}

.page-about .about-taxonomy__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.page-about .about-taxonomy__card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .45));
}

.page-about .about-taxonomy__card--cyan {
  border-top-color: var(--tag-blue);
}

.page-about .about-taxonomy__card--orange {
  border-top-color: var(--tag-orange);
}

.page-about .about-taxonomy__card--magenta {
  border-top-color: var(--tag-magenta);
}

.page-about .about-taxonomy__card--green {
  border-top-color: var(--tag-green);
}

.page-about .about-taxonomy__card--gold {
  border-top-color: var(--accent);
}

.page-about .about-taxonomy__card--blue {
  border-top-color: var(--primary);
}

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

.page-about .about-taxonomy__card-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-main);
  margin: 0;
}

.page-about .about-taxonomy__card-desc {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.6;
  margin: 0 0 14px;
}

.page-about .about-taxonomy__subtitle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--accent);
  margin: 36px 0 18px;
}

.page-about .about-taxonomy__subtitle::after {
  content: "";
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.page-about .about-taxonomy__tiles {
  margin-top: 8px;
}

.page-about .about-taxonomy__tiles .tile {
  min-height: 96px;
}

.page-about .about-taxonomy__tagcloud .tag-block {
  padding: 20px;
  background: rgba(11, 18, 32, .38);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  margin: 0;
}

.page-about .about-tag i {
  font-style: normal;
  font-weight: 900;
  font-size: 11px;
  opacity: .65;
}

.page-about .about-updates {
  position: relative;
  overflow: hidden;
}

.page-about .about-updates::before {
  content: "";
  position: absolute;
  bottom: 30px;
  left: -90px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 204, 113, .1) 0%, transparent 60%);
  pointer-events: none;
}

.page-about .about-updates__cycle {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 32px;
}

.page-about .about-updates__cycle-card {
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 3px solid var(--accent);
}

.page-about .about-updates__cycle-card:nth-child(2) {
  border-top-color: var(--primary);
}

.page-about .about-updates__cycle-card:nth-child(3) {
  border-top-color: var(--tag-magenta);
}

.page-about .about-updates__cycle-day {
  font-size: 22px;
  font-weight: 900;
  color: var(--text-main);
}

.page-about .about-updates__cycle-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .about-updates__cycle-size {
  font-style: normal;
  font-size: 13px;
  color: var(--text-sub);
}

.page-about .about-updates__layout {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-updates__table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
}

.page-about .about-updates__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 620px;
}

.page-about .about-updates__table th,
.page-about .about-updates__table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.page-about .about-updates__table th {
  background: rgba(11, 18, 32, .6);
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  white-space: nowrap;
}

.page-about .about-updates__table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .about-updates__table tbody tr:hover td {
  background: rgba(52, 152, 219, .08);
}

.page-about .about-updates__hint {
  margin: 18px 4px 4px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

.page-about .about-updates__hint a {
  color: var(--accent);
  text-decoration: none;
}

.page-about .about-updates__visual {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
  padding: 8px;
}

.page-about .about-version {
  position: relative;
  overflow: hidden;
}

.page-about .about-version__layout {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-version__cards {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .about-version__card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--card-bg);
  border-top: 3px solid var(--primary);
  transition: transform .2s, box-shadow .2s;
}

.page-about .about-version__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.page-about .about-version__card--hd {
  border-top-color: var(--accent);
}

.page-about .about-version__card--time {
  border-top-color: var(--tag-orange);
}

.page-about .about-version__card--sub {
  border-top-color: var(--tag-green);
}

.page-about .about-version__card--device {
  border-top-color: var(--tag-magenta);
}

.page-about .about-version__card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .4px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(52, 152, 219, .15);
  color: var(--primary);
  margin-bottom: 14px;
}

.page-about .about-version__card--hd .about-version__card-tag {
  background: rgba(241, 196, 15, .12);
  color: var(--accent);
}

.page-about .about-version__card--time .about-version__card-tag {
  background: rgba(230, 126, 34, .12);
  color: var(--accent-2);
}

.page-about .about-version__card--sub .about-version__card-tag {
  background: rgba(46, 204, 113, .12);
  color: var(--tag-green);
}

.page-about .about-version__card--device .about-version__card-tag {
  background: rgba(231, 76, 60, .12);
  color: var(--tag-magenta);
}

.page-about .about-version__card-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.4;
}

.page-about .about-version__card-desc {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 12px 0 0;
}

.page-about .about-version__aside-box {
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(52, 152, 219, .12), rgba(74, 35, 90, .22));
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 110px;
}

.page-about .about-version__aside-version {
  display: block;
  font-size: 42px;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 12px;
  text-shadow: 0 0 24px rgba(241, 196, 15, .3);
}

.page-about .about-version__aside-box p {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 18px;
}

.page-about .about-contact {
  position: relative;
}

.page-about .about-contact__grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  margin-bottom: 28px;
}

.page-about .about-contact__item {
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 22px;
  border-radius: var(--radius);
  position: relative;
  border-left: 3px solid var(--accent);
}

.page-about .about-contact__item:nth-child(2) {
  border-left-color: var(--primary);
}

.page-about .about-contact__item:nth-child(3) {
  border-left-color: var(--tag-green);
}

.page-about .about-contact__item-label {
  display: block;
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: .5px;
}

.page-about .about-contact__item:nth-child(2) .about-contact__item-label {
  color: var(--primary);
}

.page-about .about-contact__item:nth-child(3) .about-contact__item-label {
  color: var(--tag-green);
}

.page-about .about-contact__item-value {
  font-size: 16px;
  color: var(--text-main);
  word-break: break-all;
}

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

@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 64px;
    padding-bottom: 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  }

  .page-about .about-taxonomy__top {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-updates__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
  }

  .page-about .about-version__layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version__card,
  .page-about .about-taxonomy__card {
    transition: none;
  }
}