.page-about {
  background:
    linear-gradient(rgba(10,31,68,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10,31,68,.045) 1px, transparent 1px),
    var(--gray-bg);
  background-size: 36px 36px;
  overflow-x: hidden;
  color: var(--ink);
}

.page-about a:focus-visible,
.page-about .about-timeline-item:focus-visible,
.page-about .about-card:focus-within {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-breadcrumb {
  position: relative;
  z-index: 3;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  margin: 0 0 2rem;
  color: rgba(255,255,255,.72);
  font-size: .875rem;
}

.page-about .about-breadcrumb a {
  color: #fff;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,107,53,.6);
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .about-story-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 3rem 1.25rem 3.5rem;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 58%, #12305f 100%);
  color: #fff;
}

.page-about .about-story-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-story-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  top: 22%;
  width: 320px;
  height: 320px;
  z-index: -1;
  background:
    linear-gradient(118deg, transparent 0 46%, rgba(255,107,53,.38) 46% 49%, transparent 49% 100%),
    linear-gradient(118deg, transparent 0 66%, rgba(255,255,255,.06) 66% 68%, transparent 68% 100%);
  transform: rotate(14deg);
  border-radius: 24px;
}

.page-about .about-hero-layout {
  display: grid;
  gap: 1.75rem;
  max-width: var(--container);
  margin-inline: auto;
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero-kicker {
  display: inline-block;
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
  border: 1px solid rgba(255,107,53,.5);
  border-radius: 999px;
  padding: .4rem .8rem;
  margin-bottom: 1.25rem;
}

.page-about .about-hero-copy h1 {
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', 'Microsoft YaHei', sans-serif;
  font-size: clamp(2.1rem, 5.2vw, 3.6rem);
  line-height: 1.08;
  margin: 0 0 1.25rem;
  color: #fff;
  max-width: 14em;
}

.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: rgba(255,255,255,.86);
  max-width: 64ch;
  margin: 0;
}

.page-about .about-hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
  margin-top: 1.75rem;
  max-width: 580px;
}

.page-about .about-metric {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius);
  padding: .9rem .75rem;
  backdrop-filter: blur(8px);
}

.page-about .about-metric-num {
  display: block;
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', sans-serif;
  font-size: 1.75rem;
  line-height: 1.1;
  color: #fff;
}

.page-about .about-metric-label {
  display: block;
  font-size: .75rem;
  line-height: 1.4;
  color: rgba(255,255,255,.72);
  margin-top: .25rem;
}

.page-about .about-brand-figure {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius);
  background: var(--navy-deep);
  box-shadow: 0 20px 45px rgba(0,0,0,.32);
}

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

.page-about .about-chapter-section {
  position: relative;
  padding: 3rem 1.25rem;
  max-width: var(--container);
  margin-inline: auto;
}

.page-about .about-chapter-section + .about-chapter-section {
  border-top: 1px solid var(--border);
}

.page-about .about-chapter-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.page-about .about-chapter-number {
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', sans-serif;
  font-size: clamp(2.75rem, 8vw, 4.75rem);
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1px rgba(10,31,68,.32);
  min-width: 1.1em;
}

.page-about .about-chapter-tag {
  margin: 0 0 .3rem;
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', sans-serif;
  font-size: .8125rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-chapter-heading h2 {
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', 'Microsoft YaHei', sans-serif;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1.14;
  color: var(--navy);
  margin: 0;
}

.page-about .about-chapter-lead {
  margin: 0 0 1.5rem;
  max-width: 72ch;
  font-size: 1.0625rem;
  line-height: 1.75;
}

.page-about .about-text-col {
  min-width: 0;
}

.page-about .about-two-col {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-cards {
  display: grid;
  gap: 1rem;
}

.page-about .about-card {
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--white);
  box-shadow: var(--shadow);
}

.page-about .about-card h3 {
  margin: 0 0 .5rem;
  font-size: 1.125rem;
  color: var(--navy);
}

.page-about .about-card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-aside-note {
  border-left: 5px solid var(--teal);
  border-radius: var(--radius);
  background: var(--blue-bg);
  padding: 1.25rem;
  align-self: start;
}

.page-about .about-aside-text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-evolution-layout {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-timeline {
  display: grid;
  gap: 1rem;
}

.page-about .about-timeline-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 1rem;
  border-radius: var(--radius);
}

.page-about .about-version-tag {
  align-self: flex-start;
  padding: .55rem .65rem;
  border-radius: .55rem;
  background: var(--navy);
  color: #fff;
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', sans-serif;
  font-size: .9rem;
  letter-spacing: .08em;
  text-align: center;
}

.page-about .about-timeline-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  background: var(--white);
  box-shadow: 0 6px 18px rgba(10,31,68,.06);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.page-about .about-timeline-card h3 {
  margin: 0 0 .35rem;
  font-size: 1.125rem;
  color: var(--navy);
}

.page-about .about-timeline-card p {
  margin: .25rem 0 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-timeline-card p.about-edge-detail {
  margin-top: .45rem;
  padding-top: .45rem;
  border-top: 1px dashed var(--border);
  color: var(--ink);
  font-size: .86rem;
}

.page-about .about-evolution-visual {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--blue-bg);
}

.page-about .about-evolution-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-archive-grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-archive-block {
  display: block;
  position: relative;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.page-about .about-archive-block:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.page-about .about-archive-date {
  display: inline-block;
  padding: .3rem .7rem;
  border-radius: 999px;
  background: var(--orange-bg);
  color: var(--orange);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .06em;
  margin-bottom: .6rem;
}

.page-about .about-archive-title {
  display: block;
  margin-bottom: .35rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
}

.page-about .about-archive-desc {
  display: block;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-archive-block-accent {
  border-color: var(--navy);
  background: var(--navy);
}

.page-about .about-archive-block-accent .about-archive-date {
  background: rgba(255,107,53,.22);
  color: #ffb295;
}

.page-about .about-archive-block-accent .about-archive-title {
  color: #fff;
}

.page-about .about-archive-block-accent .about-archive-desc {
  color: rgba(255,255,255,.78);
}

.page-about .about-scale-layout {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-scale-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
  margin: 1.5rem 0;
}

.page-about .about-scale-item {
  padding: 1rem .75rem;
  border-radius: var(--radius);
  background: var(--navy);
  color: #fff;
  text-align: center;
}

.page-about .about-scale-num {
  display: block;
  font-family: Impact, 'Arial Narrow', 'PingFang SC Heavy', sans-serif;
  font-size: 2rem;
  line-height: 1.05;
  color: var(--orange);
}

.page-about .about-scale-label {
  display: block;
  margin-top: .25rem;
  font-size: .75rem;
  color: rgba(255,255,255,.75);
}

.page-about .about-category-row {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .about-category-tag {
  padding: .35rem .8rem;
  border-radius: 999px;
  background: var(--blue-bg);
  color: var(--navy);
  font-size: .8rem;
  font-weight: 700;
}

.page-about .about-scale-hint {
  margin: 1.25rem 0 0;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-scale-visual {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--blue-bg);
}

.page-about .about-scale-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-collab-grid {
  display: grid;
  gap: 1rem;
}

.page-about .about-collab-card {
  padding: 1.25rem;
  border-radius: var(--radius);
  border-left: 6px solid var(--purple);
  background: var(--white);
  box-shadow: 0 6px 18px rgba(10,31,68,.05);
}

.page-about .about-collab-card:nth-child(2) {
  border-left-color: var(--teal);
}

.page-about .about-collab-card:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .about-collab-card h3 {
  margin: 0 0 .5rem;
  font-size: 1.125rem;
  color: var(--navy);
}

.page-about .about-collab-card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-inner-path {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: linear-gradient(120deg, var(--navy), var(--navy-deep));
  color: #fff;
}

.page-about .about-inner-path > * {
  position: relative;
  z-index: 1;
}

.page-about .about-inner-path::after {
  content: "";
  position: absolute;
  right: -45px;
  bottom: -70px;
  width: 190px;
  height: 190px;
  border: 30px solid rgba(255,107,53,.2);
  border-radius: 50%;
}

.page-about .about-path-lead {
  margin: 0;
  max-width: 70ch;
  font-size: 1rem;
  line-height: 1.6;
  color: rgba(255,255,255,.88);
}

.page-about .about-path-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-inner-path .btn-ghost {
  border-color: rgba(255,255,255,.65);
  color: #fff;
}

.page-about .about-inner-path .btn-ghost:hover,
.page-about .about-inner-path .btn-ghost:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}

@media (min-width: 920px) {
  .page-about .about-story-hero {
    padding: 4rem 3rem 5rem;
  }

  .page-about .about-hero-layout {
    grid-template-columns: minmax(0, 5fr) minmax(320px, 4fr);
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-chapter-section {
    padding: 4rem 3rem;
  }

  .page-about .about-chapter-head {
    align-items: center;
    gap: 1.75rem;
    margin-bottom: 1.5rem;
  }

  .page-about .about-two-col {
    grid-template-columns: minmax(0, 2fr) minmax(240px, .8fr);
    align-items: start;
    gap: 2rem;
  }

  .page-about .about-evolution-layout {
    grid-template-columns: minmax(0, 5fr) minmax(280px, 3fr);
    align-items: center;
    gap: 2rem;
  }

  .page-about .about-archive-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-scale-layout {
    grid-template-columns: minmax(300px, 3fr) minmax(0, 5fr);
    align-items: center;
    gap: 2rem;
  }

  .page-about .about-scale-copy {
    order: 1;
  }

  .page-about .about-scale-visual {
    order: 2;
  }

  .page-about .about-collab-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: hover) {
  .page-about .about-timeline-item:hover .about-timeline-card,
  .page-about .about-timeline-item:focus-within .about-timeline-card {
    transform: translateY(-3px);
    box-shadow: 0 12px 26px rgba(10,31,68,.12);
    border-color: rgba(255,107,53,.55);
  }

  .page-about .about-timeline-card p.about-edge-detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    border-top: 0;
    padding-top: 0;
    margin-top: 0;
    transition: max-height .35s ease, opacity .3s ease, margin-top .3s ease, padding-top .3s ease;
  }

  .page-about .about-timeline-item:hover .about-timeline-card p.about-edge-detail,
  .page-about .about-timeline-item:focus-within .about-timeline-card p.about-edge-detail {
    max-height: 16em;
    opacity: 1;
    margin-top: .45rem;
    padding-top: .45rem;
    border-top: 1px dashed var(--border);
  }
}