.page-about {
  --about-deep: #081226;
  --about-bg: #0B1D3A;
  --about-card: rgba(255, 255, 255, 0.03);
  --about-card-hover: rgba(255, 255, 255, 0.05);
  --about-border: rgba(255, 255, 255, 0.08);
  --about-text: #F5F7FA;
  --about-muted: #9EB0CC;
  background: linear-gradient(180deg, var(--about-deep), var(--about-bg));
  color: var(--about-text);
  overflow-x: hidden;
}

.page-about-intro {
  padding: 4.5rem 0 1rem;
}

.page-about .breadcrumb {
  margin-bottom: 2.5rem;
}

.page-about-hero {
  position: relative;
  padding: 1.5rem 0 2.5rem;
}

.page-about-hero::before {
  content: "";
  position: absolute;
  top: -2rem;
  right: -1.5rem;
  width: 12rem;
  height: 12rem;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.16), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about-hero__kicker {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-electric);
  margin: 0 0 1rem;
}

.page-about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 11vw, 5rem);
  line-height: 1.05;
  margin: 0 0 1.25rem;
  background: linear-gradient(115deg, #FFFFFF 0%, #00D4FF 50%, #9B59B6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about-hero__lead {
  font-family: var(--font-heading);
  font-size: clamp(1.05rem, 3vw, 1.45rem);
  font-weight: 600;
  color: var(--color-light);
  margin: 0 0 0.85rem;
  max-width: 40rem;
}

.page-about-hero__desc {
  color: var(--about-muted);
  line-height: 1.8;
  margin: 0 0 1.5rem;
  max-width: 42rem;
}

.page-about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about-hero__facts li {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--about-text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-border);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
}

.page-about-chapter-head {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin: 1.5rem 0 2rem;
  padding-top: 2.2rem;
  border-top: 1px solid var(--about-border);
}

.page-about-chapter-head:first-child {
  margin-top: 0;
}

.page-about-chapter-num {
  display: block;
  min-width: 2.8rem;
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-electric);
}

.page-about-chapter-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.05em;
}

.page-about-chapter-en {
  writing-mode: vertical-rl;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--color-purple);
  opacity: 0.85;
  margin-left: auto;
}

.page-about-section-headline {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.35;
  margin: 0 0 0.75rem;
  color: var(--about-text);
}

.page-about-section-intro {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-purple);
  margin: 0 0 1rem;
}

.page-about-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about-checklist li {
  position: relative;
  padding-left: 1.7rem;
  color: var(--about-text);
  line-height: 1.65;
}

.page-about-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 0.8rem;
  height: 0.32rem;
  background: var(--color-orange);
  clip-path: polygon(0 0, 100% 0, 62% 100%, 0 100%);
}

.page-about-mission,
.page-about-journey,
.page-about-tech,
.page-about-team,
.page-about-next {
  padding-top: 2rem;
  padding-bottom: 3.5rem;
}

.page-about-mission__grid,
.page-about-tech__grid,
.page-about-team__grid {
  display: grid;
  gap: 1.75rem;
}

.page-about-mission__content p,
.page-about-tech__content p {
  color: var(--about-muted);
  line-height: 1.85;
  margin-bottom: 1.25rem;
}

.page-about-mission__media,
.page-about-tech__media,
.page-about-team__media {
  margin: 0;
}

.page-about .media-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--about-border);
  background: rgba(255, 255, 255, 0.02);
}

.page-about-journey__top {
  max-width: 38rem;
}

.page-about-timeline {
  position: relative;
  margin-top: 2.5rem;
}

.page-about-timeline::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 1px;
  background: linear-gradient(180deg, var(--color-electric) 0%, var(--color-purple) 100%);
}

.page-about-timeline__item {
  position: relative;
  padding: 0 0 1.75rem 2.5rem;
}

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

.page-about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3rem;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--color-electric);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}

.page-about-timeline__marker {
  margin-bottom: 0.6rem;
}

.page-about-timeline__version {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-orange);
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.3);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
}

.page-about-timeline__card {
  background: var(--about-card);
  border: 1px solid var(--about-border);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  box-shadow: 0 0.25rem 1rem rgba(0, 0, 0, 0.15);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about-timeline__card:hover {
  border-color: rgba(0, 212, 255, 0.4);
  transform: translateX(4px);
}

.page-about-timeline__card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.45rem;
  color: var(--about-text);
}

.page-about-timeline__card p {
  color: var(--about-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0;
}

.page-about-team__content p {
  color: var(--about-muted);
  line-height: 1.85;
  margin-bottom: 1.25rem;
}

.page-about-team__roles {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about-team__roles li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--about-muted);
  line-height: 1.65;
  font-size: 0.92rem;
}

.page-about-team__roles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.4rem;
  height: 0.4rem;
  background: var(--color-purple);
  transform: rotate(45deg);
}

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

.page-about-team__media img {
  animation: about-team-float 6s ease-in-out infinite;
}

@keyframes about-team-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.page-about-next__inner {
  background: linear-gradient(135deg, rgba(155, 89, 182, 0.14), rgba(0, 212, 255, 0.07));
  border: 1px solid var(--about-border);
  border-radius: var(--radius);
  padding: 2.25rem 1.5rem;
  text-align: center;
}

.page-about-next__inner h2 {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  margin: 0 0 0.75rem;
  color: var(--about-text);
}

.page-about-next__inner p {
  color: var(--about-muted);
  line-height: 1.75;
  max-width: 34rem;
  margin: 0 auto 1.5rem;
}

.page-about-next__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

@media (min-width: 860px) {
  .page-about-intro {
    padding-top: 6rem;
  }

  .page-about-hero {
    padding: 3rem 0 4rem;
  }

  .page-about-hero h1 {
    font-size: clamp(3.2rem, 7vw, 5.5rem);
  }

  .page-about-chapter-head {
    gap: 1.4rem;
    margin-bottom: 2.75rem;
    padding-top: 2.75rem;
  }

  .page-about-chapter-num {
    min-width: 4rem;
    font-size: 4rem;
  }

  .page-about-chapter-title {
    font-size: 1.5rem;
  }

  .page-about-mission,
  .page-about-journey,
  .page-about-tech,
  .page-about-team,
  .page-about-next {
    padding-top: 2.75rem;
  }

  .page-about-mission__grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about-mission__media {
    transform: translateY(1.5rem);
  }

  .page-about-tech__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
  }

  .page-about-tech__media {
    transform: translateY(1.25rem);
  }

  .page-about-team__grid {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: center;
  }

  .page-about-timeline {
    margin-left: 2rem;
  }

  .page-about-timeline__card {
    width: calc(100% - 1rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about-team__media img {
    animation: none;
  }

  .page-about-timeline__card {
    transition: none;
  }
}