.page-about {
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 24px;
  font-size: 13px;
  color: var(--color-muted);
}

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

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about__hero {
  position: relative;
  padding: 48px 0 56px;
  background-color: var(--color-paper);
  background-image:
    linear-gradient(rgba(27, 42, 74, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 42, 74, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.page-about__hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 32px;
}

.page-about__hero-copy {
  max-width: 640px;
}

.page-about__hero .eyebrow {
  margin-bottom: 12px;
}

.page-about__hero-desc {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink);
  max-width: 56ch;
}

.page-about__hero-svg {
  width: 100%;
  max-width: 360px;
  height: auto;
  display: block;
  filter: drop-shadow(0 8px 16px rgba(27, 42, 74, 0.12));
  flex-shrink: 0;
}

.page-about__layout {
  display: block;
  padding-top: 40px;
}

.page-about__index {
  margin-bottom: 32px;
  border-bottom: 1px solid var(--color-beige);
  padding-bottom: 8px;
}

.page-about__index-label {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-gold);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.page-about__index-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
}

.page-about__index-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--color-ink);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--color-beige);
  border-radius: 2px;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.page-about__index-link span {
  font-family: var(--font-digit);
  font-size: 12px;
  color: var(--color-gold);
}

.page-about__index-link:hover,
.page-about__index-link:focus {
  border-color: var(--color-gold);
  color: var(--color-navy);
  background-color: rgba(212, 175, 55, 0.08);
}

.page-about__main {
  padding-bottom: 64px;
}

.page-about__section {
  margin-bottom: 72px;
}

.page-about__section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-beige);
  padding-bottom: 16px;
}

.page-about__section-num {
  font-family: var(--font-digit);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.05em;
  margin: 0;
}

.page-about__section-title {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-navy);
  margin: 0;
  letter-spacing: 0.02em;
}

.page-about__section-body {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
}

.page-about__section-body p {
  margin-bottom: 16px;
}

.page-about__section-body p:last-child {
  margin-bottom: 0;
}

.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__philosophy-item {
  border-top: 3px solid var(--color-gold);
  padding: 20px 0;
  background: #fff;
  padding-left: 20px;
  padding-right: 20px;
  box-shadow: 0 2px 8px rgba(27, 42, 74, 0.04);
  transition: box-shadow 0.2s, transform 0.2s;
}

.page-about__philosophy-item:hover {
  box-shadow: 0 6px 16px rgba(27, 42, 74, 0.1);
  transform: translateY(-2px);
}

.page-about__philosophy-num {
  font-family: var(--font-heading);
  font-size: 14px;
  color: var(--color-red);
  margin: 0 0 8px;
  letter-spacing: 0.2em;
}

.page-about__philosophy-item h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--color-navy);
  margin: 0 0 12px;
}

.page-about__philosophy-item p:last-child {
  margin-bottom: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-ink);
}

.page-about__timeline-wrap {
  display: block;
}

.page-about__timeline {
  position: relative;
  padding-left: 32px;
  list-style: none;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold), rgba(212, 175, 55, 0.15));
}

.page-about__timeline-topimg {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
  object-fit: cover;
  margin: 0 0 40px;
  border-left: 6px solid var(--color-gold);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.14);
}

.page-about__milestone {
  position: relative;
  margin-bottom: 16px;
  background: #fff;
  border: 1px solid rgba(176, 166, 149, 0.5);
  border-radius: 2px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-gold);
  border: 2px solid var(--color-paper);
  box-shadow: 0 0 0 1px var(--color-gold);
  z-index: 1;
}

.page-about__milestone summary {
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 18px 20px;
  list-style: none;
  transition: background-color 0.2s;
}

.page-about__milestone summary::-webkit-details-marker {
  display: none;
}

.page-about__milestone summary:hover {
  background-color: rgba(212, 175, 55, 0.05);
}

.page-about__milestone[open] summary {
  background-color: rgba(212, 175, 55, 0.1);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}

.page-about__milestone-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 4px 8px;
  color: #fff;
  border-radius: 2px;
}

.page-about__milestone-tag--start {
  background-color: var(--color-red);
}

.page-about__milestone-tag--build {
  background-color: var(--color-navy-light);
}

.page-about__milestone-tag--update {
  background-color: var(--color-navy);
}

.page-about__milestone-tag--new {
  background-color: var(--color-gold);
  color: var(--color-navy);
}

.page-about__milestone-tag--arch {
  background-color: var(--color-beige);
  color: var(--color-navy);
}

.page-about__milestone-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-navy);
  flex: 1;
  min-width: 180px;
}

.page-about__milestone-body {
  padding: 16px 20px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-ink);
}

.page-about__milestone-body p {
  margin: 0;
}

.page-about__timeline-aside {
  margin-top: 24px;
  padding-left: 32px;
}

.page-about__timeline-aside img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
  border: 1px solid rgba(176, 166, 149, 0.4);
}

.page-about__timeline-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
  padding-left: 4px;
  border-left: 2px solid var(--color-gold);
  padding-left: 12px;
}

.page-about__section--commitment {
  background: var(--gradient-navy);
  color: #F5EFE1;
  padding: 64px 0;
  margin-bottom: 0;
}

.page-about__section--commitment .container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.page-about__commitment-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 36px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
  padding-bottom: 16px;
}

.page-about__section-num--light {
  color: var(--color-gold);
}

.page-about__section-title--light {
  color: #F5EFE1;
}

.page-about__commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__commitment-card {
  background: rgba(255, 255, 255, 0.04);
  border-top: 3px solid var(--color-gold);
  padding: 24px;
  border-radius: 2px;
  transition: background-color 0.2s, transform 0.2s;
}

.page-about__commitment-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

.page-about__commitment-index {
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--color-gold);
  margin: 0 0 10px;
  letter-spacing: 0.2em;
}

.page-about__commitment-card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  color: #F5EFE1;
  margin: 0 0 12px;
}

.page-about__commitment-card p:last-child {
  margin-bottom: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 239, 225, 0.82);
}

.page-about__commitment-note {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(245, 239, 225, 0.18);
  font-size: 14px;
  line-height: 1.9;
  color: rgba(245, 239, 225, 0.75);
}

.page-about__commitment-note a {
  color: var(--color-gold-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(241, 196, 15, 0.4);
  transition: border-color 0.2s;
}

.page-about__commitment-note a:hover {
  border-color: transparent;
}

.page-about__footer-deco {
  padding: 40px 24px 0;
  text-align: center;
  background: var(--color-paper);
}

.page-about__footer-deco img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  object-fit: cover;
  margin: 0 auto;
  opacity: 0.72;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }

  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 72px 0 80px;
  }

  .page-about__hero-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .page-about__hero-copy {
    flex: 1;
  }

  .page-about__hero-svg {
    width: 40%;
    max-width: 360px;
  }

  .page-about__hero-desc {
    font-size: 18px;
  }

  .page-about__philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about__section-title {
    font-size: 32px;
  }

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

  .page-about__timeline-wrap {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: 32px;
    align-items: start;
  }

  .page-about__timeline-aside {
    margin-top: 0;
    padding-left: 0;
  }
}

@media (min-width: 992px) {
  .page-about__layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 56px;
    max-width: var(--container);
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
  }

  .page-about__index {
    position: sticky;
    top: 24px;
    border-bottom: 0;
    border-left: 2px solid var(--color-gold);
    padding-left: 20px;
    padding-bottom: 0;
    margin-bottom: 0;
  }

  .page-about__index-nav {
    flex-direction: column;
    align-items: stretch;
    overflow-x: visible;
    gap: 4px;
    padding-bottom: 0;
  }

  .page-about__index-link {
    border: 0;
    border-radius: 0;
    padding: 10px 0;
    justify-content: flex-start;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s, color 0.2s;
  }

  .page-about__index-link::after {
    content: "";
    display: block;
    width: 0;
    height: 1px;
    background: var(--color-gold);
    transition: width 0.25s;
    margin-left: auto;
  }

  .page-about__index-link:hover::after,
  .page-about__index-link:focus::after {
    width: 24px;
  }

  .page-about__index-link:hover,
  .page-about__index-link:focus {
    background: transparent;
    color: var(--color-gold);
  }

  .page-about__main {
    padding-bottom: 96px;
  }

  .page-about__section {
    margin-bottom: 96px;
    scroll-margin-top: 24px;
  }

  .page-about__section-head {
    margin-bottom: 32px;
  }

  .page-about__timeline-topimg {
    margin-bottom: 48px;
  }

  .page-about__commitment-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__section--commitment {
    padding: 88px 0;
  }
}