.page-about {
  --about-glow: rgba(0, 230, 118, 0.35);
  --about-glow-blue: rgba(0, 176, 255, 0.28);
  --about-line: linear-gradient(180deg, rgba(0, 230, 118, 0.65), rgba(0, 176, 255, 0.5));
  --about-card-bg: linear-gradient(145deg, rgba(0, 176, 255, 0.08), rgba(0, 230, 118, 0.03));
  background: var(--bg-00);
  color: var(--txt-body);
  overflow-x: hidden;
}

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

.page-about .about-hero {
  position: relative;
  padding: 40px 0 0;
}

.page-about .about-hero::before {
  content: '01';
  position: absolute;
  top: 8px;
  right: 6%;
  font-family: var(--font-display);
  font-size: clamp(7rem, 18vw, 13rem);
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero-grid {
  display: grid;
  gap: 32px 48px;
  align-items: center;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-green);
  border: 1px solid rgba(0, 230, 118, 0.28);
  padding: 6px 12px;
  border-radius: 2px;
  background: rgba(0, 230, 118, 0.06);
  margin-bottom: 20px;
}

.page-about .about-kicker::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 66px);
  line-height: 1.04;
  color: var(--txt-strong);
  margin: 0 0 18px;
  letter-spacing: 0.01em;
  text-wrap: balance;
}

.page-about .about-hero-lead {
  font-size: 17px;
  line-height: 1.78;
  color: var(--txt-body);
  max-width: 56ch;
  margin: 0 0 28px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--border-blue);
  box-shadow: var(--shadow-card);
}

.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding-bottom: var(--space-lg);
}

.page-about .section-heading:hover .section-title {
  color: var(--accent-green);
  transition: color 0.3s ease;
}

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

.page-about .about-origin-copy p {
  line-height: 1.75;
  margin: 0 0 18px;
}

.page-about .about-origin-side {
  position: relative;
  background: var(--about-card-bg);
  border: 1px solid var(--border-blue);
  padding: 26px 24px;
}

.page-about .about-side-label {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 16px;
}

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

.page-about .about-side-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--txt-strong);
}

.page-about .about-side-marker {
  width: 6px;
  height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
  flex: 0 0 auto;
  box-shadow: 0 0 6px var(--about-glow);
}

.page-about .about-side-link {
  display: inline-block;
  margin-top: 22px;
  color: var(--accent-green);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 230, 118, 0.4);
  padding-bottom: 2px;
  transition: color 0.3s ease, border-color 0.3s ease;
}

.page-about .about-side-link:hover {
  color: var(--txt-strong);
  border-bottom-color: var(--accent-green);
}

.page-about .about-timeline {
  position: relative;
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  box-sizing: border-box;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--about-line);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 40px;
  box-sizing: border-box;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: 1px;
  top: 12px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.15), 0 0 14px var(--about-glow);
}

.page-about .about-timeline-card {
  background: var(--bg-01);
  border: 1px solid var(--border-thin);
  border-radius: 2px;
  padding: 22px 24px;
  box-shadow: var(--shadow-soft);
  transition: border-color 0.3s ease, transform 0.3s ease;
  box-sizing: border-box;
}

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

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--accent-green);
  border: 1px solid rgba(0, 230, 118, 0.35);
  padding: 4px 10px;
  border-radius: 2px;
  margin-bottom: 12px;
}

.page-about .about-timeline-card h3 {
  font-size: 20px;
  color: var(--txt-strong);
  margin: 0 0 8px;
  font-weight: 700;
}

.page-about .about-timeline-card p {
  font-size: 15px;
  line-height: 1.65;
  margin: 0;
}

.page-about .about-data-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-data-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border-blue);
  box-shadow: var(--shadow-card);
}

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

.page-about .about-stat {
  border: 1px solid var(--border-blue);
  background: var(--about-card-bg);
  padding: 18px 14px;
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 88px;
  justify-content: center;
  transition: border-color 0.3s ease, transform 0.3s ease;
  box-sizing: border-box;
}

.page-about .about-stat:hover {
  border-color: var(--accent-green);
  transform: translateY(-2px);
}

.page-about .about-stat-num {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.1;
  color: var(--txt-strong);
  letter-spacing: 0.02em;
}

.page-about .about-stat-label {
  font-size: 13px;
  color: var(--txt-mute);
  letter-spacing: 0.06em;
}

.page-about .about-data-note {
  margin-top: 32px;
  border-left: 3px solid var(--accent-green);
  background: rgba(0, 230, 118, 0.04);
  padding: 18px 22px;
  border-radius: 0 2px 2px 0;
}

.page-about .about-data-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-vision-grid {
  display: grid;
  gap: 20px;
  margin-top: 40px;
}

.page-about .about-vision-card {
  position: relative;
  background: var(--bg-01);
  border: 1px solid var(--border-thin);
  padding: 28px 24px 24px;
  border-radius: 2px;
  box-shadow: var(--shadow-soft);
  clip-path: polygon(4% 0, 100% 0, 96% 100%, 0 100%);
  transition: border-color 0.3s ease, transform 0.3s ease;
  box-sizing: border-box;
}

.page-about .about-vision-card:hover {
  border-color: var(--accent-green);
  transform: translateY(-4px);
}

.page-about .about-vision-index {
  font-family: var(--font-display);
  font-size: 46px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.08);
  display: block;
  margin-bottom: 14px;
}

.page-about .about-vision-card h3 {
  font-size: 19px;
  color: var(--txt-strong);
  margin: 0 0 10px;
  font-weight: 700;
}

.page-about .about-vision-card p {
  font-size: 15px;
  line-height: 1.65;
  margin: 0;
}

.page-about .about-vision-statement {
  margin-top: 40px;
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 26px);
  line-height: 1.5;
  color: var(--txt-strong);
  border-top: 1px solid var(--border-thin);
  border-bottom: 1px solid var(--border-thin);
  padding: 30px 20px;
}

.page-about .about-vision-statement span {
  color: var(--accent-green);
}

.page-about .about-community-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about .about-community-main p {
  line-height: 1.75;
  margin: 0 0 18px;
}

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

.page-about .about-community-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border-blue);
  box-shadow: var(--shadow-card);
}

.page-about .about-community-visual::after {
  content: '';
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 1px solid rgba(0, 230, 118, 0.35);
  pointer-events: none;
}

.page-about .about-cta {
  margin-top: var(--space-lg);
  padding: 64px 0 80px;
  background: radial-gradient(ellipse at 50% 100%, rgba(0, 176, 255, 0.14), transparent 68%);
}

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

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.4vw, 48px);
  color: var(--txt-strong);
  margin: 0 0 12px;
}

.page-about .about-cta p {
  font-size: 16px;
  color: var(--txt-body);
  margin: 0 auto 28px;
  max-width: 46ch;
}

.page-about .about-cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 56px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1fr) 340px;
  }

  .page-about .about-data-stats {
    gap: 16px;
  }

  .page-about .about-community-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }

  .page-about .about-cta {
    padding: 80px 0 96px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0;
    row-gap: 32px;
    max-width: 980px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item {
    width: 50%;
    padding: 0 48px;
  }

  .page-about .about-timeline-item:nth-child(odd) {
    text-align: right;
  }

  .page-about .about-timeline-item:nth-child(even) {
    text-align: left;
  }

  .page-about .about-timeline-dot {
    left: auto;
    right: -7px;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-dot {
    left: -7px;
    right: auto;
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .about-data-note {
    display: flex;
    align-items: flex-start;
    gap: 16px;
  }

  .page-about .about-data-note::before {
    content: '数据索引';
    flex: 0 0 auto;
    font-family: var(--font-display);
    font-size: 13px;
    letter-spacing: 0.14em;
    color: var(--accent-green);
    border: 1px solid rgba(0, 230, 118, 0.35);
    padding: 4px 10px;
    border-radius: 2px;
    margin-top: 2px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-data-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-stat:first-child {
    grid-column: span 2;
    background: linear-gradient(145deg, rgba(0, 230, 118, 0.14), rgba(0, 176, 255, 0.05));
    border-color: rgba(0, 230, 118, 0.4);
  }
}