.page-about {
  --about-rule: rgba(143, 163, 184, 0.22);
  --about-rule-strong: rgba(143, 163, 184, 0.42);
  background-color: var(--ink-navy);
  background-image:
    radial-gradient(720px 420px at 88% -8%, rgba(49, 242, 208, 0.12), transparent 68%),
    radial-gradient(560px 380px at 2% 34%, rgba(255, 107, 44, 0.08), transparent 62%);
  color: var(--board-white);
}

.page-about .about-hero {
  padding-top: clamp(18px, 2.6vw, 30px);
  padding-bottom: clamp(30px, 4vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(18px, 2.6vw, 30px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 45fr 55fr;
    align-items: start;
  }
}

.page-about .about-hero h1 {
  margin: 0.4em 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 1.1em 0 0;
  max-width: 34em;
  font-family: var(--font-body);
  font-size: clamp(0.98rem, 1.1vw, 1.0625rem);
  line-height: 1.9;
  color: rgba(244, 247, 250, 0.78);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .fact {
  min-width: 0;
  padding: 15px 10px 16px 0;
}

.page-about .fact + .fact {
  padding-left: 12px;
  border-left: 1px solid var(--about-rule);
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.8vw, 1.9rem);
  line-height: 1;
  color: var(--neon-cyan);
}

.page-about .fact__label {
  display: block;
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: var(--slate-blue);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--track-grey);
  border: 1px solid var(--about-rule-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), calc(100% - 46px) 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 46%;
  background: linear-gradient(to top, rgba(7, 26, 43, 0.94), rgba(7, 26, 43, 0));
  pointer-events: none;
}

.page-about .paper-tab {
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 2;
  padding: 8px 14px;
  background: var(--paper-beige);
  color: var(--ink-black);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  line-height: 1.5;
  max-width: 100%;
}

.page-about .about-body {
  padding-bottom: clamp(48px, 6vw, 96px);
}

.page-about .chapter {
  display: grid;
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(26px, 3.4vw, 44px) 0;
  border-top: 1px solid var(--about-rule);
}

@media (min-width: 860px) {
  .page-about .chapter {
    grid-template-columns: minmax(110px, 156px) minmax(0, 1fr);
    gap: clamp(18px, 3vw, 46px);
  }
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

@media (min-width: 860px) {
  .page-about .chapter__rail {
    position: sticky;
    top: 92px;
    align-self: start;
    flex-direction: column;
    gap: 8px;
  }
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 4.2vw, 3.2rem);
  font-weight: 700;
  line-height: 0.9;
  color: var(--neon-cyan);
}

.page-about .chapter__tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--slate-blue);
}

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

.page-about .chapter h2 {
  margin: 0 0 0.6em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.8vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .chapter p {
  margin: 0 0 1em;
  max-width: 44em;
  font-family: var(--font-body);
  font-size: 0.96rem;
  line-height: 1.9;
  color: rgba(244, 247, 250, 0.76);
}

.page-about .chapter p:last-child {
  margin-bottom: 0;
}

.page-about .lines {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

@media (min-width: 760px) {
  .page-about .lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .line-card {
  position: relative;
  padding: 17px 18px 19px;
  background: var(--paper-beige);
  color: var(--ink-navy);
  border-left: 3px solid var(--volt-orange);
  box-shadow: 5px 5px 0 rgba(8, 13, 18, 0.55);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .line-card:nth-child(even) {
  border-left-color: var(--neon-cyan);
}

.page-about .line-card:hover {
  transform: translateY(-3px);
  box-shadow: 8px 10px 0 rgba(8, 13, 18, 0.6);
}

.page-about .line-card .mono {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--deep-teal);
}

.page-about .line-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--ink-navy);
}

.page-about .line-card p {
  margin: 0;
  max-width: none;
  font-size: 0.9rem;
  line-height: 1.75;
  color: #24384a;
}

.page-about .line-card a {
  display: inline-block;
  margin-top: 13px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-navy);
  text-decoration: none;
  border-bottom: 2px solid var(--volt-orange);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .line-card a:hover,
.page-about .line-card a:focus-visible {
  color: var(--deep-teal);
  border-bottom-color: var(--deep-teal);
}

.page-about .flow {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 2.6vw, 30px);
}

@media (min-width: 800px) {
  .page-about .flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }
}

.page-about .flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .flow-list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--about-rule);
}

.page-about .flow-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .flow-list__idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--volt-orange);
  padding-top: 3px;
}

.page-about .flow-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--board-white);
}

.page-about .flow-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(244, 247, 250, 0.7);
}

.page-about .flow-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--track-grey);
  border: 1px solid var(--about-rule-strong);
}

.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .flow-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(7, 26, 43, 0.55), rgba(7, 26, 43, 0) 55%);
  pointer-events: none;
}

.page-about .scale {
  position: relative;
  margin-top: clamp(20px, 2.6vw, 30px);
  overflow: hidden;
  background: var(--track-grey);
  border: 1px solid var(--about-rule-strong);
}

.page-about .scale__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
}

.page-about .scale__inner {
  position: relative;
  z-index: 1;
  padding: clamp(14px, 2.2vw, 22px);
}

.page-about .scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule-strong);
  border: 1px solid var(--about-rule-strong);
}

@media (min-width: 700px) {
  .page-about .scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .scale__cell {
  min-width: 0;
  padding: 16px 14px 18px;
  background: rgba(7, 26, 43, 0.84);
}

.page-about .scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--neon-cyan);
}

.page-about .scale__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--slate-blue);
}

.page-about .scenes {
  display: grid;
  gap: 14px;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .page-about .scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .scenes li {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-rule);
  border-top: 2px solid var(--neon-cyan);
  background: rgba(18, 34, 51, 0.72);
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .scenes li:hover {
  border-color: var(--line-cyan);
  border-top-color: var(--neon-cyan);
  background: rgba(18, 34, 51, 0.92);
}

.page-about .scenes__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--volt-orange);
  border: 1px solid rgba(255, 107, 44, 0.4);
}

.page-about .scenes h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.3;
  color: var(--board-white);
}

.page-about .scenes p {
  margin: 0;
  max-width: none;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(244, 247, 250, 0.72);
}

.page-about .partner-card {
  margin-top: clamp(20px, 2.6vw, 30px);
  padding: clamp(18px, 2.6vw, 28px);
  background: linear-gradient(135deg, rgba(14, 79, 92, 0.5), rgba(18, 34, 51, 0.9));
  border: 1px solid var(--line-cyan);
  border-left: 4px solid var(--volt-orange);
}

.page-about .partner-card__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--slate-blue);
}

.page-about .partner-card__mail {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  word-break: break-all;
}

.page-about .partner-card__mail:hover,
.page-about .partner-card__mail:focus-visible {
  border-bottom-color: var(--neon-cyan);
}

.page-about .partner-card__note {
  margin: 14px 0 18px;
  max-width: 40em;
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(244, 247, 250, 0.7);
}

.page-about .partner-card .btn {
  display: inline-block;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .scenes li {
    transition: none;
  }
  .page-about .line-card:hover {
    transform: none;
  }
}
<<<END>>>