.page-about {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  position: relative;
}

.page-about a:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.page-about .breadcrumbs {
  padding: 20px 4px 0;
  font-size: 13px;
  color: rgba(245, 247, 246, 0.72);
}

.page-about .breadcrumbs a {
  color: var(--color-gold);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--color-gold-soft);
}

.page-about__hero {
  position: relative;
  color: #F5F7F6;
  padding: 0 0 56px;
  overflow: hidden;
  background:
    linear-gradient(rgba(212, 175, 55, 0.20) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.20) 1px, transparent 1px),
    radial-gradient(ellipse at 24% 18%, rgba(11, 61, 46, 0.9), transparent 46%),
    linear-gradient(140deg, #0E4C39 0%, var(--color-primary) 52%, var(--color-primary-dark) 100%);
  background-size: 34px 34px, 34px 34px, 100% 100%, 100% 100%;
}

.page-about__hero::after {
  content: '';
  position: absolute;
  right: -6%;
  bottom: -2px;
  width: 52%;
  height: 42px;
  background: var(--color-gold);
  transform: skewX(-14deg);
  opacity: 0.14;
  pointer-events: none;
}

.page-about__hero-curve {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 180px;
  pointer-events: none;
}

.page-about__hero-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 28px 16px 0;
  display: grid;
  gap: 28px;
  position: relative;
  z-index: 2;
}

.page-about__hero-copy {
  position: relative;
  z-index: 2;
}

.page-about__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0 0 16px;
}

.page-about__hero h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.18;
  margin: 0 0 18px;
  color: #FFFFFF;
}

.page-about__lead {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 247, 246, 0.92);
  margin: 0 0 14px;
}

.page-about__hero-note {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(245, 247, 246, 0.68);
  margin: 0 0 22px;
  border-left: 2px solid var(--color-gold);
  padding-left: 12px;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__hero-actions .btn--ghost {
  color: var(--color-gold);
  border-color: rgba(212, 175, 55, 0.5);
}

.page-about__hero-actions .btn--ghost:hover,
.page-about__hero-actions .btn--ghost:focus-visible {
  border-color: var(--color-gold);
  background: rgba(212, 175, 55, 0.1);
}

.page-about__hero-figure {
  margin: 0;
  position: relative;
  z-index: 2;
}

.page-about__hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(212, 175, 55, 0.4);
  box-shadow: 0 18px 34px rgba(8, 48, 36, 0.35);
}

.page-about__hero-figure .figure__caption {
  font-size: 12px;
  padding: 10px 12px;
}

.page-about__layout {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 16px 64px;
}

.page-about__toc {
  position: relative;
  z-index: 5;
  background: var(--color-primary);
  margin: 24px 0 32px;
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: 0 8px 20px rgba(10, 26, 20, 0.1);
}

.page-about__toc-title {
  font-size: 12px;
  letter-spacing: 0.12em;
  font-family: var(--font-mono);
  color: var(--color-gold);
  text-transform: uppercase;
  margin: 0 0 6px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.25);
}

.page-about__toc-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 6px 0 0;
  overflow-x: auto;
}

.page-about__toc-list li {
  flex: 0 0 auto;
}

.page-about__toc-list a {
  display: block;
  padding: 6px 12px;
  font-size: 13px;
  color: rgba(245, 247, 246, 0.82);
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about__toc-list a:hover,
.page-about__toc-list a:focus-visible {
  color: var(--color-gold);
  border-color: rgba(212, 175, 55, 0.55);
  background: rgba(212, 175, 55, 0.06);
}

.page-about__section {
  position: relative;
  padding-top: 20px;
}

.page-about__section + .page-about__section {
  border-top: 1px solid var(--color-line);
  margin-top: 12px;
  padding-top: 40px;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  background: var(--color-primary);
  padding: 3px 10px;
  border-radius: 999px;
  flex: 0 0 auto;
}

.page-about .section-head h2 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 24px;
  margin: 0;
  letter-spacing: 0.02em;
}

.page-about__section-lead {
  font-size: 14px;
  color: var(--color-text-sub);
  margin: 0 0 20px;
  max-width: 60ch;
}

.page-about__timeline-wrap {
  position: relative;
  background:
    linear-gradient(rgba(11, 61, 46, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 61, 46, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  padding: 8px 0 12px;
}

.page-about__milestone-bg {
  position: absolute;
  top: 0;
  right: 0;
  width: 32%;
  height: auto;
  opacity: 0.09;
  pointer-events: none;
  z-index: 0;
  filter: grayscale(1) contrast(1.2);
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 1;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 28px;
  width: 2px;
  background: var(--color-primary);
  opacity: 0.28;
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 30px 46px;
}

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

.page-about__timeline-node {
  position: absolute;
  left: 4px;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.22);
}

.page-about__timeline-card {
  margin: 0;
  padding: 16px 18px;
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-gold);
  border-radius: var(--radius);
  background: #FFFFFF;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__timeline-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-about__timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  background: var(--color-primary);
  padding: 3px 10px;
  border-radius: 999px;
}

.page-about__timeline-card h3 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  margin: 10px 0 6px;
}

.page-about__timeline-card p {
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
  color: var(--color-text);
}

.page-about__compare-grid {
  display: grid;
  gap: 16px;
}

.page-about__version-card {
  padding: 20px;
  margin: 0;
  background: #FFFFFF;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__version-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-about__version-card--old {
  border-top: 3px solid var(--color-text-sub);
}

.page-about__version-card--new {
  border-top: 3px solid var(--color-gold);
}

.page-about__version-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about__version-head h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 900;
}

.page-about__version-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  padding: 3px 8px;
  border-radius: 2px;
  color: #FFFFFF;
  flex: 0 0 auto;
}

.page-about__version-tag--old {
  background: var(--color-text-sub);
}

.page-about__version-tag--new {
  background: var(--color-gold);
  color: var(--color-primary-dark);
}

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

.page-about__version-list li {
  position: relative;
  padding: 4px 0 4px 18px;
  font-size: 14px;
  line-height: 1.6;
}

.page-about__version-list li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--color-gold);
  font-weight: 700;
}

.page-about__version-card--old .page-about__version-list li::before {
  content: "×";
  color: var(--color-red);
}

.page-about__compare-figure {
  margin: 0;
}

.page-about__compare-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 24px 0;
}

.page-about__stat {
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 18px 16px;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.page-about__stat::after {
  content: '';
  position: absolute;
  right: -12px;
  bottom: -12px;
  width: 48px;
  height: 48px;
  border: 2px solid rgba(212, 175, 55, 0.3);
  transform: rotate(45deg);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 40px;
  line-height: 1;
  color: var(--color-gold);
}

.page-about__stat-label {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(245, 247, 246, 0.86);
}

.page-about__stat p {
  margin: 6px 0 0;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(245, 247, 246, 0.62);
}

.page-about__data-detail {
  padding: 20px;
  background: #FFFFFF;
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius);
  margin: 0;
}

.page-about__data-detail h3 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  margin: 0 0 8px;
}

.page-about__data-detail p {
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
  color: var(--color-text);
}

.page-about__data-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about__data-tags span {
  background: rgba(11, 61, 46, 0.08);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(11, 61, 46, 0.12);
}

.page-about__team-grid {
  display: grid;
  gap: 20px;
}

.page-about__team-copy p {
  font-size: 14px;
  line-height: 1.7;
  margin: 0 0 12px;
  color: var(--color-text);
}

.page-about__team-copy p:last-child {
  margin-bottom: 0;
}

.page-about__principles {
  display: grid;
  gap: 12px;
}

.page-about__principle {
  padding: 16px;
  background: #FFFFFF;
  border: 1px solid var(--color-line);
  border-top: 2px solid var(--color-gold);
  border-radius: var(--radius);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.page-about__principle:hover {
  border-top-color: var(--color-red);
  box-shadow: var(--shadow-card);
}

.page-about__principle-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-red);
}

.page-about__principle h3 {
  margin: 6px 0 4px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 900;
}

.page-about__principle p {
  font-size: 13px;
  line-height: 1.65;
  margin: 0;
  color: var(--color-text-sub);
}

.page-about__cta-links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about__hero {
    padding-bottom: 72px;
  }

  .page-about__hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
    padding-top: 48px;
  }

  .page-about__hero::after {
    width: 36%;
    height: 58px;
  }

  .page-about__layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 0 48px;
    align-items: start;
    padding-top: 8px;
  }

  .page-about__toc {
    position: sticky;
    top: 24px;
    background: transparent;
    margin: 20px 0 0;
    padding: 8px 0 0;
    border-radius: 0;
    box-shadow: none;
  }

  .page-about__toc-title {
    color: var(--color-gold);
    font-size: 12px;
    letter-spacing: 0.18em;
    border-bottom: none;
    padding: 0;
    margin-bottom: 14px;
  }

  .page-about__toc-list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about__toc-list li {
    flex: none;
    border-bottom: 1px dashed var(--color-line);
  }

  .page-about__toc-list a {
    display: block;
    padding: 12px 4px;
    font-size: 14px;
    color: var(--color-text);
    border: none;
    border-radius: 0;
    position: relative;
    white-space: normal;
    background: transparent;
    transition: padding-left 0.25s var(--ease), color 0.25s ease;
  }

  .page-about__toc-list a::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 16px;
    background: var(--color-gold);
    transition: transform 0.3s var(--ease);
  }

  .page-about__toc-list a:hover,
  .page-about__toc-list a:focus-visible {
    padding-left: 12px;
    color: var(--color-primary);
    border-color: transparent;
    background: transparent;
  }

  .page-about__toc-list a:hover::before,
  .page-about__toc-list a:focus-visible::before {
    transform: translateY(-50%) scaleY(1);
  }

  .page-about__section + .page-about__section {
    padding-top: 48px;
  }

  .page-about__timeline-wrap {
    padding: 16px 0 24px;
  }

  .page-about__milestone-bg {
    width: 24%;
  }

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

  .page-about__timeline-item {
    width: 50%;
    padding: 0 44px 44px 0;
  }

  .page-about__timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 44px 44px;
  }

  .page-about__timeline-node {
    left: auto;
    right: -8px;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-node {
    left: -8px;
    right: auto;
  }

  .page-about__timeline-card {
    border-left: 1px solid var(--color-line);
    border-top: 3px solid var(--color-gold);
    text-align: left;
  }

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

  .page-about__compare-figure {
    grid-column: 1 / -1;
    max-width: 720px;
  }

  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 28px 0;
  }

  .page-about__stat {
    padding: 20px 18px;
  }

  .page-about__team-grid {
    grid-template-columns: 1fr 1.15fr;
    gap: 28px;
    align-items: start;
  }

  .page-about__cta-links {
    margin-top: 32px;
  }
}