.page-about {
  --about-rail: 1px solid rgba(255, 255, 255, 0.09);
  --about-grid-line: rgba(255, 255, 255, 0.032);
  background:
    radial-gradient(1200px 620px at 88% -12%, rgba(46, 124, 246, 0.16), transparent 62%),
    var(--bg-deep);
  color: var(--text-hi);
  min-height: 100vh;
  overflow-x: hidden;
}

.page-about .about-hero,
.page-about .about-section,
.page-about .about-next {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-hero {
  position: relative;
  padding-top: 28px;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-about .about-hero-inner {
  position: relative;
  padding-bottom: 0;
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 26px;
  font-size: 14px;
  color: var(--text-lo);
}

.page-about .about-breadcrumb a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.25s ease;
}

.page-about .about-breadcrumb a:hover {
  color: var(--accent-blue);
}

.page-about .about-breadcrumb-sep {
  color: var(--text-lo);
  opacity: 0.7;
}

.page-about .about-breadcrumb-current {
  color: var(--text-hi);
}

.page-about .about-hero-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.page-about .about-hero-copy {
  padding: 8px 0;
}

.page-about .about-hero-kick {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--accent-cyan);
}

.page-about .about-hero-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(34px, 5.4vw, 64px);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--text-hi);
}

.page-about .about-hero-subtitle {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-blue);
}

.page-about .about-hero-desc {
  max-width: 56ch;
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-lo);
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: var(--border-thin);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-chapter-map {
  margin-top: 36px;
  border-top: var(--about-rail);
}

.page-about .about-chapter-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding-top: 4px;
  padding-bottom: 4px;
}

.page-about .about-chapter-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 4px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-lo);
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease, padding-left 0.25s ease;
}

.page-about .about-chapter-item:hover {
  padding-left: 10px;
  border-bottom-color: var(--accent-cyan);
  color: var(--text-hi);
}

.page-about .about-chapter-index {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--accent-blue);
}

.page-about .about-chapter-name {
  font-size: 15px;
  line-height: 1.4;
}

.page-about .about-section {
  position: relative;
  padding: 64px 0;
}

.page-about .about-section-inner {
  position: relative;
}

.page-about .about-section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 36px;
}

.page-about .about-section-no {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--accent-blue);
  white-space: nowrap;
}

.page-about .about-section-heading {
  flex: 1;
}

.page-about .about-section-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-hi);
}

.page-about .about-section-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-lo);
}

.page-about .about-history-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-timeline-wrap {
  position: relative;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-blue), rgba(255, 255, 255, 0.07));
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 44px 40px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 0 4px rgba(46, 124, 246, 0.18);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline-item:hover::before {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 6px rgba(0, 229, 255, 0.16);
}

.page-about .about-timeline-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}

.page-about .about-timeline-year {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--accent-cyan);
}

.page-about .about-timeline-version {
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--accent-orange);
}

.page-about .about-timeline-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-hi);
}

.page-about .about-timeline-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-lo);
}

.page-about .about-timeline-figure {
  align-self: center;
  margin: 0;
}

.page-about .about-timeline-img {
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  margin-inline: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: var(--border-thin);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transform: rotate(1.2deg);
  transition: transform 0.4s ease;
}

.page-about .about-timeline-figure:hover .about-timeline-img {
  transform: rotate(0deg);
}

.page-about .about-timeline-caption {
  max-width: 360px;
  margin: 14px auto 0;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
  color: var(--text-lo);
}

.page-about .about-vision {
  background: linear-gradient(180deg, rgba(46, 124, 246, 0.1), rgba(11, 13, 18, 0) 58%);
}

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

.page-about .about-vision-lead-text {
  margin: 0 0 16px;
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-hi);
}

.page-about .about-vision-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-lo);
}

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

.page-about .about-vision-card {
  padding: 20px;
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: var(--radius);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-vision-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-hi);
}

.page-about .about-vision-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-lo);
}

.page-about .about-vision-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-card);
}

.page-about .about-versions {
  overflow: hidden;
}

.page-about .about-versions::before {
  content: "V1→V4";
  position: absolute;
  right: -60px;
  top: 10px;
  font-family: var(--font-head);
  font-size: 180px;
  font-weight: 700;
  line-height: 1;
  opacity: 0.04;
  color: var(--accent-blue);
  pointer-events: none;
  user-select: none;
}

.page-about .about-version-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-version-card {
  position: relative;
  padding: 22px;
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: var(--radius);
  cursor: default;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-version-card:hover,
.page-about .about-version-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-card);
  outline: none;
}

.page-about .about-version-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-version-year {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--accent-cyan);
}

.page-about .about-version-no {
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-blue);
}

.page-about .about-version-name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-hi);
}

.page-about .about-version-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-lo);
}

.page-about .about-version-extra {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-version-extra {
    max-height: 0;
    margin: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, opacity 0.3s ease, margin 0.3s ease;
  }

  .page-about .about-version-card:hover .about-version-extra,
  .page-about .about-version-card:focus-visible .about-version-extra {
    max-height: 180px;
    margin-top: 14px;
    opacity: 1;
  }
}

.page-about .about-version-extra li {
  position: relative;
  padding: 4px 0 4px 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-lo);
}

.page-about .about-version-extra li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent-lime);
}

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

.page-about .about-capability::before {
  content: "";
  position: absolute;
  top: 8%;
  right: -10%;
  width: 46%;
  height: 70%;
  background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.1), transparent 72%);
  pointer-events: none;
}

.page-about .about-capability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-metric-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-metric-item {
  position: relative;
  padding: 20px;
  background: rgba(21, 26, 34, 0.82);
  border: var(--border-thin);
  border-left: 3px solid var(--accent-blue);
  border-radius: 12px;
}

.page-about .about-metric-value {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--text-hi);
}

.page-about .about-metric-label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-lo);
}

.page-about .about-capability-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-capability-figure {
  margin: 0;
}

.page-about .about-capability-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: var(--border-thin);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.page-about .about-league-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-league-list li {
  padding: 8px 16px;
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--text-lo);
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: 999px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-league-list li:hover {
  color: var(--text-hi);
  border-color: var(--accent-blue);
}

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

.page-about .about-security-card {
  padding: 24px;
  background: linear-gradient(160deg, rgba(21, 26, 34, 0.92), rgba(11, 13, 18, 0.64));
  border: var(--border-thin);
  border-radius: var(--radius);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about .about-security-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-blue);
}

.page-about .about-security-tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent-lime);
  border: 1px solid rgba(192, 255, 0, 0.24);
  border-radius: 999px;
}

.page-about .about-security-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-hi);
}

.page-about .about-security-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-lo);
}

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

.page-about .about-team-lead {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.32;
  color: var(--text-hi);
}

.page-about .about-team-copy {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-lo);
}

.page-about .about-team-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-team-fact {
  padding: 24px 12px 22px;
  text-align: center;
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: var(--radius);
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.page-about .about-team-fact:hover {
  transform: translateY(-3px);
  border-color: var(--accent-cyan);
}

.page-about .about-team-fact-num {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.08;
  color: var(--accent-cyan);
}

.page-about .about-team-fact-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-lo);
}

.page-about .about-next {
  padding: 72px 0;
  border-top: var(--about-rail);
  background: linear-gradient(180deg, rgba(46, 124, 246, 0.14), rgba(11, 13, 18, 0) 70%);
}

.page-about .about-next-inner {
  text-align: center;
}

.page-about .about-next-kicker {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--accent-cyan);
}

.page-about .about-next-title {
  margin: 0 0 32px;
  font-family: var(--font-head);
  font-size: clamp(28px, 4.6vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  text-transform: uppercase;
  color: var(--text-hi);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.page-about .about-next-link {
  display: inline-block;
  padding: 12px 20px;
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: 999px;
  color: var(--text-lo);
  text-decoration: none;
  transition: transform 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.page-about .about-next-link:hover {
  transform: translateY(-2px);
  border-color: var(--accent-blue);
  color: var(--text-hi);
}

@media (min-width: 600px) {
  .page-about .about-chapter-list {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

@media (min-width: 720px) {
  .page-about .about-sectionhead,
  .page-about .about-section-head {
    flex-direction: row;
    align-items: baseline;
    gap: 24px;
    margin-bottom: 48px;
  }

  .page-about .about-section-head .about-section-no {
    padding-top: 6px;
  }

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

  .page-about .about-next-link {
    padding: 14px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding: 96px 0;
  }

  .page-about .about-hero-body {
    grid-template-columns: 1.06fr 0.94fr;
    gap: 48px;
  }

  .page-about .about-history-grid {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 56px;
  }

  .page-about .about-vision-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
  }

  .page-about .about-capability-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-team-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 48px;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-chapter-list {
    grid-template-columns: repeat(6, 1fr);
  }

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

  .page-about .about-version-card {
    padding: 26px 22px;
  }

  .page-about .about-sectiontitle,
  .page-about .about-section-title {
    font-size: 44px;
  }
}