.page-about {
  --about-content-pad: clamp(20px, 5vw, 72px);
  background: var(--m6-bg);
  color: var(--m6-text);
  font-family: var(--m6-font);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.about-shell {
  min-height: 100vh;
}

.about-rail {
  background: var(--m6-bg-card);
  padding: clamp(32px, 6vw, 64px) clamp(20px, 4vw, 56px);
  border-bottom: 1px solid var(--m6-line);
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 4vw, 48px);
  position: relative;
  overflow: hidden;
}

.about-rail::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--m6-accent);
}

.about-rail .m6-breadcrumb {
  margin-bottom: 24px;
}

.about-rail__top {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.about-rail__code {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--m6-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--m6-accent);
  margin-bottom: 12px;
}

.about-rail__code::before {
  content: '';
  width: 12px;
  height: 12px;
  background: var(--m6-accent);
}

.about-rail__heading h1 {
  margin: 0;
  font-size: clamp(44px, 8vw, 80px);
  line-height: 0.95;
  font-weight: 800;
  color: var(--m6-heading);
  letter-spacing: -0.02em;
}

.about-rail__subtitle {
  margin: 14px 0 0;
  color: var(--m6-dim);
  font-size: 16px;
  line-height: 1.5;
  max-width: 320px;
}

.about-rail__figure {
  margin: 0;
  background: var(--m6-bg);
  border: 1px solid var(--m6-line);
  padding: clamp(10px, 2vw, 18px);
  position: relative;
}

.about-rail__figure::after {
  content: '';
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 28px;
  height: 28px;
  border-right: 2px solid var(--m6-accent);
  border-bottom: 2px solid var(--m6-accent);
  pointer-events: none;
}

.about-rail__facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.about-fact {
  background: var(--m6-bg);
  border: 1px solid var(--m6-line);
  padding: 14px 10px;
}

.about-fact__num {
  display: block;
  font-family: var(--m6-mono);
  font-size: clamp(20px, 3vw, 28px);
  color: var(--m6-accent);
  line-height: 1.1;
  font-weight: 700;
}

.about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--m6-dim);
}

.about-content {
  padding: clamp(32px, 6vw, 88px) var(--about-content-pad) clamp(48px, 8vw, 96px);
  background-image:
    linear-gradient(var(--m6-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--m6-line) 1px, transparent 1px);
  background-size: 32px 32px;
}

.about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: clamp(28px, 5vw, 56px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--m6-line-strong);
}

.about-index a {
  font-family: var(--m6-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--m6-dim);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.3s var(--m6-ease), border-color 0.3s var(--m6-ease);
}

.about-index a:hover {
  color: var(--m6-accent);
  border-color: var(--m6-accent);
}

.about-section {
  border-top: 1px solid var(--m6-line);
  padding: clamp(48px, 8vw, 104px) 0;
}

.about-section__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: clamp(24px, 4vw, 48px);
}

.about-section__num {
  font-family: var(--m6-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--m6-accent);
  border: 1px solid var(--m6-line-strong);
  padding: 8px 12px;
  white-space: nowrap;
}

.about-section__body h2 {
  margin: 0 0 20px;
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.1;
  color: var(--m6-heading);
}

.about-section__body p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--m6-text);
  max-width: 650px;
  margin: 0 0 16px;
}

.about-section__body .about-lead {
  color: var(--m6-dim);
  font-size: 18px;
  margin-bottom: 32px;
}

.about-origin__quote {
  margin: 28px 0 0;
  padding: 14px 22px;
  border-left: 3px solid var(--m6-accent);
  background: var(--m6-accent-soft);
  color: var(--m6-heading);
  font-size: 18px;
  line-height: 1.6;
  max-width: 640px;
}

.about-route {
  margin: 0 0 44px;
  padding: 12px;
  background: var(--m6-bg-card);
  border: 1px solid var(--m6-line);
}

.about-route figcaption,
.about-coverage__figure figcaption {
  padding: 12px 4px 0;
  font-size: 13px;
  color: var(--m6-dim);
  font-family: var(--m6-mono);
}

.about-timeline {
  position: relative;
  padding-left: 32px;
}

.about-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--m6-line-strong);
}

.about-milestone {
  position: relative;
  padding: 0 0 36px;
}

.about-milestone::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--m6-accent);
  box-shadow: 0 0 0 4px var(--m6-accent-soft);
}

.about-milestone__year {
  font-family: var(--m6-mono);
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1;
  color: var(--m6-accent);
  font-weight: 700;
  margin-bottom: 8px;
}

.about-milestone__body h3 {
  margin: 0 0 6px;
  font-size: 19px;
  color: var(--m6-heading);
  font-weight: 600;
}

.about-milestone__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--m6-dim);
}

.about-coverage {
  display: grid;
  gap: 22px;
  margin-bottom: 36px;
}

.about-coverage__figure {
  margin: 0;
  padding: 12px;
  background: var(--m6-bg-card);
  border: 1px solid var(--m6-line);
}

.about-coverage__figure img {
  width: 100%;
}

.about-coverage__list {
  background: var(--m6-bg-card);
  border: 1px solid var(--m6-line);
}

.about-coverage__list-title {
  display: block;
  padding: 14px 18px 10px;
  font-family: var(--m6-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--m6-dim);
  border-bottom: 1px solid var(--m6-line);
}

.about-coverage__list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-coverage__list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--m6-line);
  font-size: 15px;
  color: var(--m6-text);
}

.about-coverage__list li:last-child {
  border-bottom: none;
}

.about-coverage__list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--m6-accent);
  flex-shrink: 0;
}

.about-stats {
  display: grid;
  gap: 12px;
  border: 1px solid var(--m6-line);
  padding: 12px;
  margin-bottom: 32px;
}

.about-stat {
  padding: 18px;
  background: var(--m6-bg-card);
  text-align: left;
}

.about-stat__num {
  display: block;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--m6-accent);
}

.about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--m6-dim);
}

.about-values {
  display: grid;
  gap: 16px;
  margin: 36px 0;
}

.about-value {
  background: var(--m6-bg-card);
  border: 1px solid var(--m6-line);
  border-top: 2px solid var(--m6-accent);
  padding: 24px;
}

.about-value__index {
  font-family: var(--m6-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--m6-accent);
}

.about-value h3 {
  margin: 12px 0 8px;
  font-size: 20px;
  color: var(--m6-heading);
  font-weight: 600;
}

.about-value p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--m6-dim);
}

.about-recognition {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.about-recognition__item {
  background: var(--m6-bg-2);
  border: 1px solid var(--m6-line);
  padding: 24px;
}

.about-recognition__item strong {
  display: block;
  margin-top: 12px;
  font-size: 22px;
  font-weight: 700;
  color: var(--m6-heading);
}

.about-recognition__item p {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--m6-dim);
}

.about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 28px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--m6-line);
}

@media (max-width: 420px) {
  .about-rail__facts {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) {
  .about-coverage {
    grid-template-columns: 1.3fr 0.7fr;
    align-items: start;
  }

  .about-values {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    padding: 0;
  }

  .about-stat {
    padding: 24px 20px;
  }

  .about-stat + .about-stat {
    border-left: 1px solid var(--m6-line);
  }

  .about-milestone {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 24px;
  }

  .about-milestone__year {
    text-align: right;
    margin: 0;
  }
}

@media (min-width: 1024px) {
  .about-shell {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
  }

  .about-rail {
    border-right: 1px solid var(--m6-line);
    border-bottom: none;
  }

  .about-content {
    padding-top: clamp(48px, 6vw, 96px);
  }
}