.page-about {
  --page-about-h1: clamp(42px, 7.2vw, 84px);
  --page-about-num: clamp(56px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about__hero {
  position: relative;
  padding: 28px 0 56px;
  color: var(--white);
  background:
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.035) 0 2px, transparent 2px 10px),
    linear-gradient(135deg, var(--deep-blue) 0%, var(--secondary-blue) 100%);
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 46%;
  height: 8px;
  background: var(--orange);
}

.page-about__breadcrumbs {
  margin-bottom: 24px;
}

.page-about__breadcrumbs a,
.page-about__breadcrumbs span {
  color: rgba(248, 247, 245, 0.82);
  text-decoration: none;
}

.page-about__breadcrumbs a:hover {
  color: var(--orange);
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: end;
}

.page-about__hero-copy {
  padding-top: 28px;
}

.page-about__hero-title {
  font-family: var(--font-display);
  font-size: var(--page-about-h1);
  line-height: 0.98;
  letter-spacing: -0.04em;
  margin: 18px 0 24px;
}

.page-about__hero-title span {
  display: block;
  margin-top: 12px;
  color: var(--orange);
  font-size: 0.56em;
  letter-spacing: -0.02em;
}

.page-about__hero-lead {
  max-width: 60ch;
  color: rgba(248, 247, 245, 0.86);
}

.page-about__hero-aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about__hero-meta {
  position: relative;
  background: rgba(248, 247, 245, 0.08);
  border: 1px solid rgba(248, 247, 245, 0.16);
  border-radius: var(--radius-m);
  padding: 22px;
  backdrop-filter: blur(6px);
}

.page-about__hero-meta-label {
  display: block;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yellow);
}

.page-about__hero-meta-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about__hero-meta-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(248, 247, 245, 0.12);
  font-size: 15px;
  color: rgba(248, 247, 245, 0.86);
}

.page-about__hero-meta-list li:last-child {
  border-bottom: 0;
}

.page-about__hero-meta-list strong {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about__hero-figure,
.page-about__evolution-figure,
.page-about__map-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-l);
  background: var(--secondary-blue);
  box-shadow: var(--shadow-soft);
}

.page-about__hero-figure {
  aspect-ratio: 2 / 3;
}

.page-about__hero-figure img,
.page-about__evolution-figure img,
.page-about__map-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about__shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-top: 48px;
  padding-bottom: 72px;
}

.page-about__sidebar {
  min-width: 0;
}

.page-about__toc {
  margin-bottom: 20px;
}

.page-about .toc-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}

.page-about .toc-link {
  white-space: nowrap;
}

.page-about__trust {
  margin: 0;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  border-left: 4px solid var(--green);
  background: rgba(42, 157, 143, 0.08);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  color: var(--ink);
}

.page-about__content {
  min-width: 0;
  max-width: 860px;
}

.page-about__chapter {
  scroll-margin-top: 24px;
}

.page-about__chapter + .page-about__chapter {
  margin-top: 48px;
}

.page-about__chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
  border-bottom: 2px solid rgba(247, 127, 0, 0.55);
  padding-bottom: 10px;
}

.page-about__chapter-number {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--orange);
  letter-spacing: 0;
}

.page-about__chapter-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 32px;
  line-height: 1.1;
  color: var(--deep-blue);
  letter-spacing: -0.02em;
}

.page-about__origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about__chapter-note {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.5;
  color: var(--secondary-blue);
  border-left: 4px solid var(--orange);
  padding-left: 16px;
  min-width: 0;
}

.page-about__chapter-note p {
  margin: 0;
}

.page-about__chapter-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about__chapter-body p + p {
  margin-top: 16px;
}

.page-about__section-lead {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}

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

.page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 18px;
  padding-bottom: 42px;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 86px;
  top: 44px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange) 0%, rgba(247, 127, 0, 0.18) 100%);
}

.page-about__timeline-item:last-child::before {
  display: none;
}

.page-about__timeline-marker {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--orange);
  background: var(--cream);
  border: 2px solid var(--orange);
  border-radius: var(--radius-s);
  padding: 5px 9px;
  transform: rotate(-2deg);
  text-align: center;
  align-self: start;
  line-height: 1.2;
}

.page-about__timeline-content h3 {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.2;
  color: var(--deep-blue);
}

.page-about__timeline-content p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about__evolution-figure {
  aspect-ratio: 3 / 2;
  margin-top: 8px;
}

.page-about__legacy-wrap {
  margin: 8px 0 48px;
}

.page-about__legacy-guide {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 28px;
  background: var(--deep-blue);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-soft);
  position: relative;
  overflow: hidden;
  color: var(--white);
}

.page-about__legacy-guide::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 150px;
  height: 150px;
  border: 24px solid rgba(247, 127, 0, 0.18);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__legacy-head {
  position: relative;
  z-index: 1;
}

.page-about__legacy-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: 10px;
}

.page-about__legacy-head h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-about__legacy-head p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(248, 247, 245, 0.82);
}

.page-about__legacy-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about__legacy-steps li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(248, 247, 245, 0.14);
  font-size: 15px;
  line-height: 1.6;
  color: rgba(248, 247, 245, 0.9);
}

.page-about__legacy-steps li:last-child {
  border-bottom: 0;
}

.page-about__legacy-steps span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  color: var(--orange);
  min-width: 28px;
}

.page-about__data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 28px;
}

.page-about__data-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about__data-bars {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about__data-bar-row {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 12px;
  align-items: center;
}

.page-about__data-bar-label {
  font-size: 13px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--ink);
}

.page-about__data-bar-track {
  height: 38px;
  background: rgba(11, 27, 58, 0.08);
  border-radius: var(--radius-s);
  overflow: hidden;
}

.page-about__data-bar-fill {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  padding-right: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  color: var(--deep-blue);
  background: var(--orange);
  border-radius: var(--radius-s);
  white-space: nowrap;
  transform-origin: left center;
  animation: page-about-bar-grow 0.7s ease-out both;
}

.page-about__bar-a {
  width: 96%;
}

.page-about__bar-b {
  width: 82%;
}

.page-about__bar-c {
  width: 100%;
}

.page-about__bar-d {
  width: 88%;
}

.page-about__bar-e {
  width: 64%;
  background: var(--green);
  color: var(--deep-blue);
}

.page-about__map-figure {
  aspect-ratio: 16 / 10;
  margin-top: 12px;
}

.page-about__promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about__promise-item {
  background: var(--white);
  border: 1px solid rgba(11, 27, 58, 0.12);
  border-top: 4px solid var(--orange);
  border-radius: var(--radius-m);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.page-about__promise-item:nth-child(4) {
  border-top-color: var(--green);
}

.page-about__promise-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--deep-blue);
  letter-spacing: -0.01em;
}

.page-about__promise-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about__contact-note {
  margin-top: 28px;
  padding: 20px 24px;
  background: rgba(42, 157, 143, 0.08);
  border-left: 4px solid var(--green);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about__contact-note p {
  margin: 0;
}

.page-about__contact-note p + p {
  margin-top: 8px;
}

.page-about__contact-note a {
  color: var(--deep-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--orange);
}

.page-about__contact-note a:hover {
  color: var(--orange);
}

.page-about__outro {
  margin-top: 56px;
  padding: 32px;
  background: var(--orange);
  border-radius: var(--radius-l);
  color: var(--deep-blue);
  box-shadow: var(--shadow-soft);
}

.page-about__outro-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about__outro h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-about__outro p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  opacity: 0.88;
}

.page-about__outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about__outro .button--primary {
  background: var(--deep-blue);
  border-color: var(--deep-blue);
  color: var(--white);
}

.page-about__outro .button--ghost {
  border-color: var(--deep-blue);
  color: var(--deep-blue);
}

@keyframes page-about-bar-grow {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

@media (min-width: 720px) {
  .page-about__hero-aside {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about__legacy-guide {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 32px;
  }

  .page-about__data-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.2fr);
    align-items: center;
  }

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

  .page-about__outro-inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding: 64px 0 88px;
  }

  .page-about__hero-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    gap: 48px;
  }

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

  .page-about__shell {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
    padding-bottom: 96px;
  }

  .page-about__sidebar {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .toc-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .toc-link {
    white-space: normal;
  }

  .page-about__origin-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 2.2fr);
    gap: 48px;
  }

  .page-about__timeline-item {
    grid-template-columns: 120px 1fr;
    gap: 32px;
  }

  .page-about__timeline-item::before {
    left: 130px;
  }

  .page-about__timeline-marker {
    text-align: right;
    justify-self: end;
  }

  .page-about__chapter-head {
    margin-bottom: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__data-bar-fill {
    animation: none;
  }
}