.page-about {
  --about-line: rgba(245, 247, 250, 0.14);
  --about-pad: clamp(24px, 5vw, 48px);
  background: var(--color-deep-space);
  color: var(--color-white);
  overflow: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: 24px 0 72px;
  background: linear-gradient(135deg, var(--color-deep-space) 0%, var(--color-vibrant-blue) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background: linear-gradient(90deg, var(--color-neon-green) 0%, var(--color-neon-green) 38%, var(--color-flame-orange) 38%, var(--color-flame-orange) 100%);
  transform: skewY(-0.8deg);
  transform-origin: bottom left;
  z-index: 2;
}

.page-about .grid-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
  z-index: 0;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: 36px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-silver);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "·";
  margin-right: 8px;
  color: var(--color-silver);
}

.page-about .breadcrumb-item a {
  color: var(--color-neon-green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.page-about .breadcrumb-item a:hover {
  border-bottom-color: var(--color-neon-green);
}

.page-about .breadcrumb-item.is-active {
  color: var(--color-white);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero-copy .section-label {
  margin-bottom: 10px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.7rem, 4vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 4px 0 18px;
  color: var(--color-white);
}

.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-silver);
  max-width: 55ch;
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-visual .stage-frame {
  border: 1px solid rgba(245, 247, 250, 0.2);
  padding: 10px;
  background: rgba(255, 255, 255, 0.02);
}

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

.page-about .hero-visual-caption {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-silver);
  border-bottom: 2px solid var(--color-flame-orange);
  padding-bottom: 4px;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 40px;
  border-top: 1px solid var(--about-line);
  padding-top: 28px;
}

.page-about .stat-chip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-line);
  padding: 12px 18px;
  transition: border-color 0.3s, transform 0.3s;
}

.page-about .stat-chip:hover {
  border-color: var(--color-flame-orange);
  transform: translateY(-3px);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-neon-green);
  display: block;
  line-height: 1.2;
}

.page-about .stat-label {
  font-size: 0.8rem;
  color: var(--color-silver);
  margin-top: 4px;
  display: block;
}

.page-about .about-section-head {
  margin-bottom: 28px;
}

.page-about .about-section-head .slant-accent {
  display: inline-block;
  width: 34px;
  height: 8px;
  background: var(--color-flame-orange);
  transform: skewX(-24deg);
  margin-right: 10px;
  vertical-align: 2px;
}

.page-about .about-section-head .section-title {
  margin: 6px 0 12px;
  font-size: clamp(1.75rem, 3vw, 2.6rem);
}

.page-about .about-section-lead {
  color: var(--color-silver);
  font-size: 0.96rem;
  max-width: 55ch;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-timeline,
.page-about .about-league,
.page-about .about-database,
.page-about .about-region,
.page-about .about-team,
.page-about .about-next {
  padding: 64px 0;
}

.page-about .about-timeline {
  background: var(--color-deep-space);
}

.page-about .timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

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

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

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

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.4rem, 8vw, 4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-neon-green);
  margin-bottom: 12px;
  transition: color 0.3s, transform 0.3s;
}

.page-about .timeline-item:hover .timeline-year {
  color: var(--color-flame-orange);
  transform: translateX(4px);
}

.page-about .timeline-card {
  position: relative;
  border: 1px solid var(--about-line);
  background: rgba(27, 58, 107, 0.35);
  padding: 24px;
  transition: border-color 0.35s, background 0.35s, box-shadow 0.35s;
}

.page-about .timeline-card::after {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 28px;
  height: 28px;
  border-left: 3px solid var(--color-flame-orange);
  border-top: 3px solid var(--color-flame-orange);
  pointer-events: none;
}

.page-about .timeline-item:hover .timeline-card {
  border-color: var(--color-flame-orange);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  background: rgba(27, 58, 107, 0.5);
}

.page-about .timeline-card h3 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.2rem;
  margin: 0;
  color: var(--color-white);
}

.page-about .timeline-summary {
  font-weight: 600;
  color: rgba(245, 247, 250, 0.88);
  margin: 10px 0 0;
  font-size: 0.96rem;
  line-height: 1.6;
}

.page-about .timeline-detail {
  margin-top: 0;
  border-left: 3px solid var(--color-flame-orange);
  padding-left: 14px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, opacity 0.4s ease, margin-top 0.4s ease;
}

.page-about .timeline-detail p {
  font-size: 0.88rem;
  color: var(--color-silver);
  line-height: 1.7;
  margin: 0;
}

.page-about .timeline-item:hover .timeline-detail,
.page-about .timeline-item:focus-within .timeline-detail {
  max-height: 20rem;
  opacity: 1;
  margin-top: 12px;
}

.page-about .timeline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about .timeline-aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-content: start;
}

.page-about .aside-note {
  background: rgba(255, 122, 0, 0.06);
  border-left: 4px solid var(--color-flame-orange);
  padding: 16px 18px;
  transition: background 0.3s;
}

.page-about .aside-note:hover {
  background: rgba(255, 122, 0, 0.1);
}

.page-about .aside-note .note-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--color-flame-orange);
  border-bottom: 2px solid transparent;
  width: fit-content;
  transition: border-color 0.3s, color 0.3s;
}

.page-about .aside-note:hover .note-num,
.page-about .aside-note:focus-within .note-num {
  border-bottom-color: var(--color-flame-orange);
  color: var(--color-white);
}

.page-about .aside-note p {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: var(--color-silver);
  line-height: 1.55;
}

.page-about .about-league {
  position: relative;
  background: var(--color-graphite);
}

.page-about .league-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .league-desc {
  line-height: 1.75;
  font-size: 0.96rem;
  color: rgba(245, 247, 250, 0.85);
  max-width: 58ch;
  margin: 0;
}

.page-about .league-list {
  list-style: none;
  margin: 20px 0 28px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .league-list li {
  position: relative;
  padding-left: 24px;
  color: rgba(245, 247, 250, 0.85);
  font-size: 0.92rem;
  line-height: 1.6;
}

.page-about .league-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 12px;
  height: 4px;
  background: var(--color-neon-green);
  transform: skewX(-20deg);
}

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

.page-about .league-visual {
  position: relative;
  display: flex;
  flex-direction: column;
}

.page-about .league-visual .img-frame {
  border: 1px solid var(--about-line);
  background: var(--color-vibrant-blue);
}

.page-about .league-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
}

.page-about .league-note.aside-note {
  position: relative;
  max-width: 240px;
  margin-top: -32px;
  margin-left: auto;
  margin-right: 16px;
  background: var(--color-graphite);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
  z-index: 2;
}

.page-about .about-database {
  position: relative;
  background: var(--color-graphite);
  overflow: hidden;
}

.page-about .about-database::before {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 320px;
  height: 320px;
  background: linear-gradient(135deg, rgba(198, 255, 0, 0.1), rgba(255, 122, 0, 0.06));
  transform: rotate(-12deg) skewX(-10deg);
  pointer-events: none;
}

.page-about .about-database .container {
  position: relative;
  z-index: 1;
}

.page-about .database-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}

.page-about .data-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 220px;
  background: var(--color-vibrant-blue);
  border: 1px solid var(--about-line);
  padding: 28px;
  transition: border-color 0.35s, transform 0.35s, box-shadow 0.35s;
}

.page-about .data-card:hover,
.page-about .data-card:focus-within {
  border-color: var(--color-flame-orange);
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.page-about .data-card-status {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-silver);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 24px;
}

.page-about .data-card .data-number {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  line-height: 1.2;
  margin-bottom: 14px;
  display: block;
}

.page-about .data-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 900;
  margin: 0 0 8px;
  color: var(--color-white);
}

.page-about .data-card p {
  color: var(--color-silver);
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0;
}

.page-about .database-cta {
  margin-top: 36px;
  text-align: center;
}

.page-about .region-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about .region-desc {
  line-height: 1.75;
  font-size: 0.96rem;
  color: rgba(245, 247, 250, 0.85);
  max-width: 58ch;
  margin: 0;
}

.page-about .region-quote {
  border-left: 4px solid var(--color-neon-green);
  padding: 8px 0 8px 18px;
  margin: 24px 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-white);
}

.page-about .region-aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-content: start;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.page-about .team-feature-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-feature-list li {
  position: relative;
  padding-left: 22px;
  color: rgba(245, 247, 250, 0.85);
  font-size: 0.93rem;
  line-height: 1.6;
}

.page-about .team-feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 4px;
  background: var(--color-flame-orange);
  transform: skewX(-20deg);
}

.page-about .team-visual {
  position: relative;
}

.page-about .team-visual .img-frame {
  border: 1px solid var(--about-line);
  background: var(--color-vibrant-blue);
}

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

.page-about .team-note.aside-note {
  position: absolute;
  right: 16px;
  bottom: -24px;
  max-width: 230px;
  background: var(--color-graphite);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.page-about .cert-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 48px;
  border-top: 1px solid var(--about-line);
  padding-top: 28px;
}

.page-about .about-next {
  background: var(--color-graphite);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--about-line);
  border-left: 1px solid var(--about-line);
}

.page-about .next-card {
  display: block;
  border: 1px solid var(--about-line);
  border-top: none;
  border-left: none;
  padding: 24px 20px;
  text-decoration: none;
  transition: background 0.3s, border-color 0.3s;
}

.page-about .next-card:hover {
  background: rgba(255, 122, 0, 0.08);
  border-color: var(--color-flame-orange);
  z-index: 1;
}

.page-about .next-index {
  font-family: var(--font-mono);
  color: var(--color-flame-orange);
  font-size: 0.8rem;
}

.page-about .next-card h3 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.1rem;
  margin: 10px 0 6px;
  color: var(--color-white);
}

.page-about .next-card p {
  color: var(--color-silver);
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 0 0 12px;
}

.page-about .next-arrow {
  font-family: var(--font-mono);
  color: var(--color-neon-green);
  font-size: 1rem;
}

@media (hover: none), (max-width: 899px) {
  .page-about .timeline-detail {
    max-height: 20rem;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (min-width: 560px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .about-timeline,
  .page-about .about-league,
  .page-about .about-region,
  .page-about .about-team,
  .page-about .about-next {
    padding: 96px 0;
  }

  .page-about .about-database {
    padding: 88px 0;
  }

  .page-about .timeline-layout {
    grid-template-columns: 1fr 260px;
    gap: 48px;
    align-items: start;
  }

  .page-about .timeline-aside {
    position: sticky;
    top: 96px;
  }

  .page-about .timeline-list::before {
    content: "";
    position: absolute;
    left: 218px;
    top: 12px;
    bottom: 12px;
    width: 2px;
    background: linear-gradient(180deg, var(--color-neon-green), var(--color-flame-orange));
    opacity: 0.25;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
    padding-bottom: 56px;
  }

  .page-about .timeline-year {
    text-align: right;
    font-size: clamp(2.8rem, 5vw, 4.4rem);
    margin-bottom: 0;
  }

  .page-about .league-layout {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
  }

  .page-about .region-layout {
    grid-template-columns: 1.3fr 260px;
    gap: 64px;
  }

  .page-about .team-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
  }

  .page-about .team-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .database-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about .next-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}