.page-about {
  --about-line: rgba(147, 164, 192, 0.22);
  --about-soft-accent: rgba(0, 232, 143, 0.07);
  --about-glow: 0 0 50px rgba(0, 163, 255, 0.12);
  background: var(--primary-bg);
  color: var(--text-primary);
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  overflow-x: hidden;
}

.page-about .about-breadcrumb {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-breadcrumb__sep {
  margin: 0 0.6rem;
  color: var(--text-secondary);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 0 2rem;
  background:
    radial-gradient(circle at 85% 20%, rgba(0, 163, 255, 0.2), transparent 350px),
    linear-gradient(180deg, var(--secondary-bg) 0%, var(--primary-bg) 100%);
}

.page-about .about-hero::after {
  content: 'BANDAO';
  position: absolute;
  top: 6%;
  right: -2%;
  font-size: 6vw;
  font-weight: 900;
  letter-spacing: 0.2em;
  line-height: 1;
  color: rgba(230, 240, 255, 0.04);
  pointer-events: none;
  white-space: nowrap;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__content {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.page-about .about-hero__title {
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.page-about .about-hero__lead {
  font-size: clamp(0.875rem, 1.2vw, 1.125rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 36em;
  margin-bottom: 2rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .about-hero__visual {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-glow);
  box-shadow: var(--about-glow);
  aspect-ratio: 16 / 9;
}

.page-about .about-hero__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 232, 143, 0.08), transparent 40%);
  pointer-events: none;
}

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

.page-about .about-hero__stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
}

.page-about .about-stat {
  background: var(--card-bg);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 900;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--text-secondary);
}

.page-about .about-mission {
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-section-head .section__index {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.page-about .about-section-head .section__index::after {
  content: '';
  width: 56px;
  height: 1px;
  background: var(--accent);
  opacity: 0.5;
}

.page-about .about-section-head .section__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-about .about-mission__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-mission__para {
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.page-about .about-mission__facts {
  align-self: start;
  background: var(--secondary-bg);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.5rem 1.5rem 1.5rem 1.75rem;
}

.page-about .about-mission__facts-title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.page-about .about-mission__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-mission__list-item {
  position: relative;
  padding-left: 1.25rem;
  padding-bottom: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.page-about .about-mission__list-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

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

.page-about .about-timeline {
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-timeline__layout {
  display: grid;
  gap: 2rem;
}

.page-about .about-timeline__nav {
  display: flex;
  gap: 0.625rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: none;
}

.page-about .about-timeline__nav::-webkit-scrollbar {
  display: none;
}

.page-about .about-timeline__nav-link {
  flex: 0 0 auto;
  padding: 0.5rem 1rem;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.page-about .about-timeline__nav-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.page-about .about-timeline__content {
  display: grid;
  gap: 1rem;
}

.page-about .about-timeline__item {
  background: var(--card-bg);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.625rem;
  scroll-margin-top: 5rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.page-about .about-timeline__item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(0, 232, 143, 0.08);
  transform: translateY(-2px);
}

.page-about .about-timeline__item:target {
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(0, 232, 143, 0.14);
}

.page-about .about-timeline__num {
  font-size: 1.125rem;
  font-weight: 900;
  color: var(--accent);
  line-height: 1;
}

.page-about .about-timeline__title {
  font-size: clamp(1.0625rem, 2.4vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.page-about .about-timeline__desc {
  color: var(--text-secondary);
  line-height: 1.65;
  font-size: 0.9375rem;
}

.page-about .about-timeline__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--about-line);
  margin-top: 0.5rem;
}

.page-about .about-arch {
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-arch__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-arch__lead {
  color: var(--text-secondary);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.page-about .about-arch__points {
  display: grid;
  gap: 1rem;
}

.page-about .about-arch__point {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  background: var(--secondary-bg);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.page-about .about-arch__point-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border-glow);
  border-radius: 50%;
  color: var(--accent);
  font-weight: 800;
  font-size: 0.875rem;
}

.page-about .about-arch__point-title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.page-about .about-arch__point-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.page-about .about-arch__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-glow);
  box-shadow: var(--about-glow);
}

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

.page-about .about-commitment {
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-commitment__grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-commitment__item {
  background: var(--card-bg);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-commitment__item:hover {
  border-color: var(--accent);
  box-shadow: 0 0 40px rgba(0, 232, 143, 0.06);
}

.page-about .about-commitment__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 1.25rem;
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 900;
}

.page-about .about-commitment__title {
  font-size: 1.125rem;
  font-weight: 800;
  margin-bottom: 0.625rem;
}

.page-about .about-commitment__text {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.65;
}

.page-about .about-support {
  padding-top: clamp(3rem, 7vw, 5rem);
  padding-bottom: clamp(4rem, 9vw, 7rem);
  background: linear-gradient(180deg, transparent, rgba(0, 163, 255, 0.06) 60%, transparent);
}

.page-about .about-support__title {
  font-size: clamp(1.5rem, 3.6vw, 2.75rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  max-width: 18em;
}

.page-about .about-support__body {
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 44em;
  margin-bottom: 1rem;
}

.page-about .about-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: clamp(4rem, 8vw, 7rem);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
    margin-top: 4rem;
  }

  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 3.5rem;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 3.5rem;
  }

  .page-about .about-timeline__nav {
    flex-direction: column;
    align-items: flex-start;
    position: sticky;
    top: 5rem;
    height: fit-content;
    align-self: start;
    border-left: 1px solid var(--about-line);
    padding-left: 1.25rem;
    overflow: visible;
  }

  .page-about .about-timeline__nav-link {
    border: none;
    border-radius: 0;
    padding: 0.4rem 0;
    font-size: 1.0625rem;
    font-weight: 700;
    position: relative;
  }

  .page-about .about-timeline__nav-link::before {
    content: '';
    position: absolute;
    left: -1.25rem;
    top: 0.4rem;
    bottom: 0.4rem;
    width: 3px;
    background: transparent;
    border-radius: 2px;
    transition: background 0.3s ease;
  }

  .page-about .about-timeline__nav-link:hover::before {
    background: var(--accent);
  }

  .page-about .about-timeline__content {
    gap: 1.5rem;
  }

  .page-about .about-timeline__item {
    grid-template-columns: auto 1fr;
    gap: 1rem;
    padding: 1.75rem;
  }

  .page-about .about-arch__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-arch__point {
    grid-template-columns: auto 1fr;
    gap: 1rem;
  }

  .page-about .about-commitment__grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-timeline__layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 4rem;
  }

  .page-about .about-timeline__nav-link {
    font-size: 1.125rem;
  }

  .page-about .about-arch__grid {
    gap: 4rem;
  }
}