.page-about {
  background:
    radial-gradient(ellipse at 82% 4%, rgba(0, 255, 146, 0.07), transparent 40%),
    radial-gradient(ellipse at 8% 48%, rgba(0, 229, 255, 0.05), transparent 32%);
}

.page-about .about-hero {
  padding-bottom: 56px;
  margin-bottom: 24px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
}

.page-about .about-kicker {
  margin-bottom: 14px;
  color: var(--c-cyan);
}

.page-about .about-title {
  font-family: var(--font-sans);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 800;
  line-height: 1.14;
  margin-bottom: 16px;
  color: var(--c-white);
}

.page-about .about-hero-lead {
  max-width: 760px;
  margin-bottom: 44px;
  color: var(--c-mist);
  font-size: 1.05rem;
  line-height: 1.75;
}

.page-about .about-toc {
  display: grid;
  gap: 14px;
}

.page-about .about-toc .chapter-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px 18px;
  background: linear-gradient(135deg, rgba(13, 59, 92, 0.58), rgba(10, 30, 63, 0.82));
  border: 1px solid rgba(0, 255, 146, 0.16);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: border-color var(--motion), box-shadow var(--motion), transform var(--motion);
}

.page-about .about-toc .chapter-card:hover,
.page-about .about-toc .chapter-card:focus-visible {
  border-color: var(--c-green);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}

.page-about .about-toc .chapter-card-index {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-green);
}

.page-about .about-toc .chapter-card-title {
  font-size: 1.13rem;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-toc .chapter-card-desc {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--c-gray);
}

.page-about .about-toc .chapter-card-link {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 18px);
}

.page-about .about-chapter-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-chapter-num {
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(0, 255, 146, 0.14);
}

.page-about .about-chapter-titlebox h2 {
  margin: 2px 0 0;
  font-size: 1.55rem;
  line-height: 1.2;
  color: var(--c-white);
}

.page-about .about-chapter-body {
  color: var(--c-mist);
  line-height: 1.8;
}

.page-about .about-chapter-body p {
  margin: 0 0 18px;
}

.page-about .about-story-grid {
  display: grid;
  gap: 28px;
}

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

.page-about .about-story-img {
  margin: 0;
  width: 100%;
}

.page-about .about-story-img img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, rgba(0, 255, 146, 0.5), rgba(0, 229, 255, 0.6) 55%, rgba(0, 229, 255, 0.1));
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 42px 40px;
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-green);
  box-shadow: 0 0 12px rgba(0, 255, 146, 0.35);
  transition: box-shadow var(--motion);
}

.page-about .about-timeline-item:hover::before,
.page-about .about-timeline-item:focus-within::before {
  box-shadow: 0 0 20px rgba(0, 255, 146, 0.75);
}

.page-about .about-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.04em;
  color: var(--c-green);
}

.page-about .about-event h3 {
  margin: 10px 0 6px;
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .about-event p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-arch-lead,
.page-about .about-team-lead {
  max-width: 760px;
  font-size: 1.02rem;
  line-height: 1.8;
}

.page-about .about-pipeline {
  display: grid;
  gap: 16px;
  margin-bottom: 28px;
}

.page-about .about-pipe-node {
  position: relative;
  padding: 22px;
  background: linear-gradient(160deg, rgba(13, 59, 92, 0.75), rgba(10, 30, 63, 0.9));
  border: 1px solid rgba(0, 229, 255, 0.16);
  border-left: 3px solid var(--c-green);
  border-radius: 4px 14px 14px 4px;
}

.page-about .about-pipe-tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-about .about-pipe-node h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .about-pipe-node p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-arch-img {
  margin: 0;
  width: 100%;
}

.page-about .about-arch-img img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
}

.page-about .about-team-roles {
  display: grid;
  gap: 16px;
  margin: 24px 0 28px;
}

.page-about .about-role-card {
  padding: 24px;
}

.page-about .about-role-code {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-role-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  color: var(--c-white);
}

.page-about .about-role-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-culture-note {
  padding: 18px 20px;
  background: rgba(255, 61, 46, 0.06);
  border-left: 3px solid var(--c-red);
  border-radius: 0 10px 10px 0;
}

.page-about .about-partner-grid {
  display: grid;
  gap: 28px;
}

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

.page-about .about-partner-img {
  margin: 0;
  width: 100%;
  max-width: 560px;
}

.page-about .about-partner-img img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
}

.page-about .about-nextsteps {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid rgba(0, 255, 146, 0.12);
}

.page-about .about-nextsteps .index-label {
  margin-bottom: 18px;
  color: var(--c-green);
}

.page-about .about-next-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-about .about-next-grid .content-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: rgba(13, 59, 92, 0.4);
  border: 1px solid rgba(0, 255, 146, 0.1);
  border-radius: 4px;
  transition: transform var(--motion), border-color var(--motion);
}

.page-about .about-next-grid .content-card:hover,
.page-about .about-next-grid .content-card:focus-visible {
  border-color: var(--c-green);
  transform: translateY(-2px);
}

.page-about .about-next-grid .content-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-next-grid .content-card-text {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--c-gray);
}

@media (min-width: 768px) {
  .page-about .about-toc {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about .about-toc .chapter-card:nth-child(1),
  .page-about .about-toc .chapter-card:nth-child(2),
  .page-about .about-toc .chapter-card:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .about-toc .chapter-card:nth-child(4),
  .page-about .about-toc .chapter-card:nth-child(5) {
    grid-column: span 3;
  }

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

@media (min-width: 900px) {
  .page-about .about-chapter {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
    align-items: start;
  }

  .page-about .about-chapter-head {
    position: sticky;
    top: calc(var(--header-h) + 40px);
    display: block;
    margin-bottom: 0;
  }

  .page-about .about-chapter-num {
    display: block;
    margin-bottom: 16px;
    font-size: 5rem;
    color: rgba(0, 255, 146, 0.08);
  }

  .page-about .about-chapter-titlebox .index-label {
    display: inline-block;
    margin-bottom: 8px;
  }

  .page-about .about-chapter-titlebox h2 {
    font-size: 2rem;
  }

  .page-about .about-story-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 56px;
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    left: 220px;
  }

  .page-about .about-timeline-item::before {
    left: 213px;
  }

  .page-about .about-year {
    padding-right: 56px;
    text-align: right;
  }

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

  .page-about .about-pipe-node:not(:last-child)::after {
    content: "→";
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 1.4rem;
    color: var(--c-green);
  }

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

  .page-about .about-partner-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: clamp(40px, 5vw, 72px);
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-next-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}