.page-about {
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(243, 235, 221, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(243, 235, 221, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--cream);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

.page-about a:focus-visible,
.page-about [tabindex="0"]:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 3px;
}

/* ---------- hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px) 0 clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.34;
  filter: saturate(0.85) contrast(1.15);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(115deg, rgba(7, 19, 38, 0.96) 24%, rgba(18, 59, 143, 0.74) 64%, rgba(7, 19, 38, 0.58) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
  font-size: 13px;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.2vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 24ch;
  color: var(--cream);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 235, 221, 0.84);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .hero-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 6px 11px;
  color: var(--cyan);
  border: 1px solid rgba(79, 209, 197, 0.38);
  background: rgba(11, 27, 51, 0.6);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 4vw, 32px);
}

/* ---------- canvas ---------- */
.page-about .about-canvas {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(26px, 5vw, 56px) var(--gutter) 0;
  display: grid;
  gap: clamp(20px, 4vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-rail {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rock);
}

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

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  color: rgba(243, 235, 221, 0.78);
  border: 1px solid var(--line);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .rail-link .mono {
  font-size: 11px;
  color: var(--rock);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cream);
  border-color: var(--cyan);
  background: rgba(79, 209, 197, 0.08);
}

.page-about .rail-link:hover .mono,
.page-about .rail-link:focus-visible .mono {
  color: var(--lime);
}

/* ---------- chapters ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  padding: clamp(22px, 4vw, 38px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .chapter-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  flex: none;
}

.page-about .about-chapter h2,
.page-about .about-join h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.32rem, 3.4vw, 2rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-chapter p,
.page-about .about-join p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 235, 221, 0.84);
}

.page-about .about-figure {
  margin: 20px 0 22px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.08);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .figure-note {
  display: block;
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

/* ---------- version timeline ---------- */
.page-about .versions {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .v-item {
  position: relative;
  padding: 10px 0 12px;
}

.page-about .v-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  transform: rotate(45deg);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.page-about .v-item:hover::before,
.page-about .v-item:focus-within::before {
  background: var(--orange);
  transform: rotate(45deg) scale(1.2);
}

.page-about .v-range {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .v-title {
  display: block;
  margin-top: 3px;
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-about .v-note {
  display: block;
  margin-top: 6px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(243, 235, 221, 0.68);
}

/* ---------- data band ---------- */
.page-about .about-band {
  margin: clamp(26px, 5vw, 44px) 0;
  padding: clamp(20px, 4vw, 34px);
  background:
    linear-gradient(135deg, rgba(183, 255, 60, 0.1) 0%, rgba(183, 255, 60, 0) 42%),
    var(--blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .band-title {
  margin: 0 0 18px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(243, 235, 221, 0.72);
}

.page-about .band-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .stat {
  min-width: 0;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.1;
  color: var(--lime);
  letter-spacing: -0.01em;
}

.page-about .stat__unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--cream);
}

.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(243, 235, 221, 0.78);
}

/* ---------- coverage list ---------- */
.page-about .coverage-list {
  list-style: none;
  margin: 6px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .cov-item {
  background: var(--blue-ink);
  padding: 12px 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.page-about .cov-name {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--cream);
  min-width: 3.5em;
}

.page-about .cov-meta {
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(243, 235, 221, 0.68);
}

/* ---------- certifications ---------- */
.page-about .cert-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .cert {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .cert:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.page-about .cert-icon {
  flex: none;
  margin-top: 2px;
  color: var(--cyan);
  transition: color 0.2s ease;
}

.page-about .cert:hover .cert-icon,
.page-about .cert:focus-within .cert-icon {
  color: var(--orange);
}

.page-about .cert-body {
  min-width: 0;
}

.page-about .cert-name {
  display: block;
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .cert-note {
  display: block;
  margin-top: 5px;
  font-size: 0.86rem;
  line-height: 1.65;
  color: rgba(243, 235, 221, 0.66);
}

/* ---------- join ---------- */
.page-about .about-join {
  margin-top: clamp(20px, 4vw, 34px);
  padding: clamp(26px, 5vw, 42px) 0 clamp(44px, 7vw, 78px);
  border-top: 2px solid var(--lime);
  background: linear-gradient(180deg, rgba(18, 59, 143, 0.3), rgba(7, 19, 38, 0));
}

.page-about .join-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 20px;
}

.page-about .join-link {
  display: block;
  padding: 14px 16px;
  text-decoration: none;
  border: 1px solid var(--line-strong);
  background: rgba(11, 27, 51, 0.72);
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .join-link:hover,
.page-about .join-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--lime);
  background: rgba(183, 255, 60, 0.07);
}

.page-about .join-link__label {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .join-link strong {
  display: block;
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--cream);
}

/* ---------- medium screens ---------- */
@media (min-width: 720px) {
  .page-about .band-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px 20px;
  }

  .page-about .coverage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .cert-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .cert:nth-last-child(2) {
    border-bottom: 1px solid var(--line-strong);
  }

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

/* ---------- desktop blueprint rail ---------- */
@media (min-width: 900px) {
  .page-about .about-canvas {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
    padding-left: 14px;
  }

  .page-about .rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .rail-link {
    padding: 9px 0;
    border: 0;
    font-size: 13.5px;
    background: none;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: none;
    color: var(--lime);
    padding-left: 6px;
  }

  .page-about .about-chapter {
    padding-top: clamp(28px, 3vw, 42px);
  }

  .page-about .about-chapter p {
    font-size: 1.03rem;
  }
}

/* ---------- hover-enabled expansion ---------- */
@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .page-about .v-note,
  .page-about .cert-note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.28s ease, opacity 0.22s ease, margin-top 0.22s ease;
  }

  .page-about .v-item:hover .v-note,
  .page-about .v-item:focus-within .v-note {
    max-height: 6em;
    opacity: 1;
    margin-top: 6px;
  }

  .page-about .cert:hover .cert-note,
  .page-about .cert:focus-within .cert-note {
    max-height: 6em;
    opacity: 1;
    margin-top: 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .join-link,
  .page-about .rail-link,
  .page-about .v-item::before,
  .page-about .cert-icon,
  .page-about .v-note,
  .page-about .cert-note {
    transition: none;
  }

  .page-about .join-link:hover,
  .page-about .join-link:focus-visible {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>