.page-about {
  --about-max-content: 1280px;
  background: var(--color-field);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.8;
}

.page-about__hero {
  position: relative;
  overflow: hidden;
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--color-border);
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(105deg, var(--color-field) 0%, var(--color-panel) 70%, var(--color-grid) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 0 100%);
  z-index: 0;
}

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

.page-about__breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  gap: 8px;
}

.page-about__breadcrumb-list .breadcrumb__item {
  color: var(--color-muted);
  font-size: 14px;
}

.page-about__breadcrumb-list .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-border);
}

.page-about__title-stack {
  max-width: 720px;
}

.page-about__eyebrow {
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 20px;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.page-about h1 {
  font-family: var(--font-heading);
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1.05;
  margin: 0 0 16px;
  color: var(--color-text);
}

.page-about__lead {
  max-width: 720px;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.8;
  margin: 0 0 24px;
}

.page-about__hero-num {
  position: absolute;
  right: 4%;
  bottom: -28px;
  font-family: var(--font-heading);
  font-size: clamp(80px, 18vw, 220px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px rgba(0,255,136,0.35);
  opacity: 0.6;
  pointer-events: none;
  z-index: 1;
}

.page-about__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-5) 0;
}

.page-about__index {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-panel);
  padding: var(--space-3);
}

.page-about__index-title {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.page-about__index-list a {
  display: block;
  color: var(--color-text);
  text-decoration: none;
  padding: 12px 8px;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition), background var(--transition);
}

.page-about__index-list li:last-child a {
  border-bottom: 0;
}

.page-about__index-list a:hover,
.page-about__index-list a:focus {
  color: var(--color-primary);
  background: rgba(0,255,136,0.06);
}

.page-about__index-note {
  margin: 16px 0 0;
  color: var(--color-muted);
  font-size: 13px;
}

.page-about__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.about-section {
  scroll-margin-top: calc(var(--header-h) + 32px);
}

.about-section__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  border-top: 2px solid var(--color-border);
  padding-top: var(--space-3);
}

.about-section__num {
  font-family: var(--font-heading);
  font-size: clamp(32px, 7vw, 64px);
  line-height: 1;
  color: var(--color-primary);
}

.about-section__title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1.1;
  margin: 0;
  color: var(--color-text);
}

.about-section__body p,
.about-vision__body p,
.about-timeline__card p,
.about-quality__item p,
.about-description-list__item dd {
  color: var(--color-muted);
  font-size: 16px;
}

.about-media {
  margin: var(--space-4) 0 0;
}

.about-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
}

.about-media figcaption {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.5;
}

.about-timeline {
  position: relative;
  margin: var(--space-4) 0 0;
  padding-left: 24px;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-border) 70%, var(--color-accent));
}

.about-timeline__item {
  position: relative;
  margin-bottom: var(--space-4);
}

.about-timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(0,255,136,0.15);
}

.about-timeline__item--current::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(255,122,26,0.2);
}

.about-timeline__year {
  font-family: var(--font-heading);
  font-size: 42px;
  line-height: 1;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.about-timeline__item--current .about-timeline__year {
  color: var(--color-accent);
}

.about-timeline__card {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.about-timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--color-text);
}

.about-section__footnote {
  margin: var(--space-2) 0 0;
  color: var(--color-muted);
  font-size: 14px;
}

.about-data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.about-data-chart {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.about-data-chart svg {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: var(--space-2);
}

.about-data-chart__label,
.about-data-chart__value {
  margin: 0;
}

.about-data-chart__label {
  color: var(--color-muted);
  font-size: 14px;
}

.about-data-chart__value {
  font-family: var(--font-heading);
  font-size: 48px;
  line-height: 1.1;
  color: var(--color-primary);
}

.about-description-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin: var(--space-2) 0 0;
}

.about-description-list__item {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-2);
}

.about-description-list__item dt {
  color: var(--color-text);
  font-weight: 700;
  margin-bottom: 4px;
}

.about-description-list__item dd {
  margin: 0;
}

.about-quality {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.about-quality__text p {
  color: var(--color-text);
  margin: 0 0 var(--space-2);
}

.about-quality__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-2);
}

.about-quality__item {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.about-quality__num {
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: 1;
  color: var(--color-accent);
}

.about-quality__item strong {
  display: block;
  color: var(--color-text);
  margin-bottom: 4px;
}

.about-quality__item p {
  margin: 0;
}

.about-vision {
  margin: var(--space-4) 0 0;
  padding: var(--space-4) var(--space-3);
  background: linear-gradient(135deg, var(--color-panel), var(--color-field));
  border-left: 6px solid var(--color-primary);
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.25;
}

.about-vision p {
  margin: 0;
}

.about-vision__body {
  margin-top: var(--space-3);
}

.about-quote {
  position: relative;
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-3);
  background: var(--color-panel);
  clip-path: polygon(0 0, 100% 8%, 100% 92%, 0 100%);
  color: var(--color-text);
}

.about-quote__mark {
  font-size: 64px;
  line-height: 0.8;
  color: var(--color-primary);
  display: block;
}

.about-quote p {
  margin: 8px 0 0;
  font-size: 20px;
  line-height: 1.7;
  max-width: 720px;
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 80px 0 64px;
  }

  .about-data-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .about-quality {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

@media (min-width: 1024px) {
  .page-about__layout {
    grid-template-columns: 240px 1fr;
    gap: var(--space-5);
  }

  .page-about__index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .about-section__header {
    margin-bottom: var(--space-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}