.page-about {
  --page-rail: 280px;
  --page-hero-bg:
    radial-gradient(900px 420px at 92% -12%, rgba(33, 199, 248, 0.16), transparent 60%),
    radial-gradient(700px 420px at 6% 8%, rgba(61, 240, 141, 0.13), transparent 55%),
    var(--bg-base);
  background: var(--page-hero-bg);
  color: var(--text-1);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: 48px 0 56px;
}

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

.page-about .about-hero__content {
  min-width: 0;
  order: 1;
}

.page-about .about-hero__media {
  min-width: 0;
  order: 2;
}

.page-about .about-hero__figure {
  aspect-ratio: 16 / 9;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  overflow: hidden;
}

.page-about .about-hero__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin: 8px 0 0;
  font-size: 0.8125rem;
  color: var(--text-2);
}

.page-about .about-h1__sep {
  display: block;
  width: 64px;
  height: 4px;
  margin: 16px 0;
  background: linear-gradient(90deg, var(--green), transparent);
  font-size: 0;
}

.page-about h1 {
  margin: 18px 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.125rem, 5.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.625rem, 2.6vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  line-height: 1.4;
}

.page-about p {
  margin: 0 0 14px;
  line-height: 1.75;
}

.page-about .about-hero__lead {
  color: var(--text-2);
  font-size: 1.0625rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-stats {
  border-bottom: 1px solid var(--line);
  background: rgba(18, 26, 23, 0.72);
}

.page-about .about-stats__inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  min-width: 0;
  background: var(--bg-panel);
  padding: 20px 18px;
}

.page-about .about-stat__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.625rem, 3.4vw, 2.625rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
  transition: transform 0.4s ease;
}

.page-about .about-stat:hover .about-stat__num {
  transform: translateY(-2px) scale(1.03);
}

.page-about .about-stat__num small {
  font-size: 0.55em;
  margin-left: 6px;
  color: var(--text-2);
  letter-spacing: 0;
}

.page-about .about-stat__label {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--text-2);
}

.page-about .about-layout {
  display: grid;
  gap: 40px;
  padding: 56px 0 80px;
}

.page-about .about-guide {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(61, 240, 141, 0.06), transparent 180px),
    var(--bg-panel);
}

.page-about .about-guide__title {
  margin: 8px 0 20px;
  font-size: 1.5rem;
}

.page-about .about-guide__nav {
  display: grid;
  gap: 6px;
  margin-bottom: 24px;
}

.page-about .about-guide__node {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 10px;
  border-left: 3px solid var(--line);
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition:
    color 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease;
}

.page-about .about-guide__node:hover {
  border-left-color: var(--green);
  background: rgba(61, 240, 141, 0.05);
  color: var(--text-1);
}

.page-about .about-guide__node.is-active {
  border-left-color: var(--green);
  background: rgba(61, 240, 141, 0.08);
  color: var(--text-1);
}

.page-about .about-guide__no {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--green);
}

.page-about .about-guide__note {
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  font-size: 0.875rem;
  color: var(--text-2);
}

.page-about .about-guide__note .tag {
  margin-bottom: 10px;
}

.page-about .about-guide__note p {
  margin-bottom: 8px;
}

.page-about .about-guide__more {
  display: inline-block;
  margin-top: 4px;
  color: var(--green);
  text-decoration: none;
  font-weight: 600;
}

.page-about .about-main {
  min-width: 0;
  display: grid;
  gap: 72px;
}

.page-about .about-section__head {
  margin-bottom: 24px;
}

.page-about .about-section__head .eyebrow,
.page-about .about-license__head .eyebrow,
.page-about .about-manifesto .eyebrow {
  display: block;
  margin-bottom: 10px;
  color: var(--green);
}

.page-about .about-section__intro {
  color: var(--text-2);
}

.page-about .about-archives__lead {
  color: var(--text-2);
  font-size: 1.0625rem;
}

.page-about .about-archives__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 28px 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-card {
  min-width: 0;
  background: var(--bg-card);
  padding: 24px;
}

.page-about .about-card__index {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  color: var(--green);
}

.page-about .about-card p {
  color: var(--text-2);
  font-size: 0.9375rem;
}

.page-about .about-archives__note {
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  font-size: 0.875rem;
  color: var(--text-2);
}

.page-about .timeline {
  list-style: none;
  margin: 40px 0;
  padding: 0;
  display: grid;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 14px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--green) 0 8px,
    transparent 8px 16px
  );
  opacity: 0.35;
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 20px;
  padding: 0 0 40px;
}

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

.page-about .timeline__year {
  position: relative;
  z-index: 1;
  justify-self: start;
  align-self: start;
  cursor: help;
  padding: 6px 10px 6px 16px;
  background: var(--green);
  color: #05120a;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.2;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
}

.page-about .timeline__body {
  min-width: 0;
  padding-bottom: 8px;
  border-left: 1px solid var(--line);
  padding-left: 24px;
}

.page-about .timeline__body p {
  color: var(--text-2);
  font-size: 0.9375rem;
}

.page-about .about-milestone__foot {
  margin-top: 32px;
  padding: 20px 24px;
  border-left: 3px solid var(--cyan);
  background: rgba(33, 199, 248, 0.06);
  color: var(--text-2);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-about .about-olduser__grid,
.page-about .about-sync__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-olduser__media,
.page-about .about-olduser__body,
.page-about .about-sync__media,
.page-about .about-sync__body {
  min-width: 0;
}

.page-about .about-olduser__media {
  order: 1;
}

.page-about .about-olduser__body {
  order: 2;
}

.page-about .about-olduser__figure,
.page-about .about-sync__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  overflow: hidden;
}

.page-about .about-olduser__figure {
  aspect-ratio: 460 / 320;
}

.page-about .about-sync__figure {
  aspect-ratio: 520 / 360;
}

.page-about .about-olduser__figure img,
.page-about .about-sync__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-olduser__caption,
.page-about .about-sync__caption {
  margin: 8px 0 0;
  font-size: 0.8125rem;
  color: var(--text-2);
}

.page-about .about-list {
  list-style: none;
  margin: 20px 0 28px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 28px;
  color: var(--text-2);
  line-height: 1.6;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--green);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 30% 100%);
}

.page-about .about-olduser__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-sync__assure {
  color: var(--text-2);
  font-size: 0.9375rem;
}

.page-about .about-sync__assure a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 199, 248, 0.4);
}

.page-about .about-license__card {
  padding: 32px 28px;
  border-color: var(--gold);
  background:
    linear-gradient(135deg, rgba(255, 200, 87, 0.08), transparent 45%),
    var(--bg-panel);
}

.page-about .about-license__head {
  margin-bottom: 24px;
}

.page-about .about-license__head .eyebrow {
  color: var(--gold);
}

.page-about .about-license__list {
  display: grid;
  margin: 0 0 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-license__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-license__row dt {
  color: var(--text-2);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

.page-about .about-license__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-1);
  word-break: break-word;
}

.page-about .about-license__notice {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.page-about .about-license__notice p {
  flex: 1 1 260px;
  margin: 0;
  color: var(--text-2);
  font-size: 0.875rem;
  line-height: 1.6;
}

.page-about .about-license__card > .btn {
  margin-top: 4px;
}

.page-about .about-manifesto {
  position: relative;
  padding: 40px 32px;
  border: 1px solid var(--gold);
  background:
    linear-gradient(135deg, rgba(255, 200, 87, 0.1), transparent 48%),
    var(--bg-panel);
}

.page-about .about-manifesto::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 64px;
  width: 96px;
  height: 3px;
  background: var(--gold);
}

.page-about .about-manifesto__quote {
  margin: 0;
}

.page-about .about-manifesto .eyebrow {
  color: var(--gold);
}

.page-about .about-manifesto__quote p {
  margin: 16px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 2.4vw, 2.25rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-about .about-manifesto__quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--gold);
  letter-spacing: 0.12em;
}

@media (min-width: 640px) {
  .page-about .about-stats__inner {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-about .about-license__card {
    padding: 40px 36px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 64px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__content {
    order: 1;
  }

  .page-about .about-hero__media {
    order: 2;
  }

  .page-about .about-layout {
    grid-template-columns: var(--page-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-guide {
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .about-olduser__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-sync__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-license__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-manifesto {
    padding: 56px 48px;
  }
}