.page-about {
  --about-paper: #FFF9F0;
  --about-border: rgba(31, 26, 28, 0.12);
  --about-border-strong: rgba(31, 26, 28, 0.26);
  background:
    repeating-linear-gradient(
      0deg,
      rgba(255, 77, 109, 0.02) 0,
      rgba(255, 77, 109, 0.02) 1px,
      transparent 1px,
      transparent 4px
    ),
    linear-gradient(180deg, var(--sakura) 0%, var(--cream) 340px, var(--cream) 100%);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 520px;
  overflow: hidden;
  border-bottom: 4px solid var(--strawberry);
  scroll-margin-top: calc(var(--header-height) + 24px);
}

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

.page-about .about-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-hero__shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    0deg,
    rgba(31, 26, 28, 0.74) 0%,
    rgba(31, 26, 28, 0.38) 52%,
    rgba(255, 224, 232, 0.06) 100%
  );
}

.page-about .about-hero__grain {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255, 249, 240, 0.12) 1px, transparent 1px);
  background-size: 14px 14px;
  opacity: 0.5;
  mix-blend-mode: overlay;
  pointer-events: none;
}

.page-about .about-hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 3rem 1.25rem;
  color: var(--text-inverse);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 1.5rem;
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(255, 249, 240, 0.88);
  border-bottom: 1px solid rgba(255, 249, 240, 0.4);
}

.page-about .about-hero .breadcrumb__item[aria-current="page"] {
  color: var(--peach);
  font-weight: 700;
}

.page-about .about-hero .breadcrumb__separator {
  color: rgba(255, 249, 240, 0.6);
}

.page-about .about-hero__stamp {
  display: inline-block;
  border: 2px solid var(--honey);
  color: var(--honey);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  padding: 0.22rem 0.8rem;
  border-radius: 999px;
  transform: rotate(-2deg);
  margin-bottom: 1rem;
  background: rgba(31, 26, 28, 0.28);
}

.page-about .about-hero__kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 249, 240, 0.78);
}

.page-about .about-hero__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 5vw, 3rem);
  line-height: 1.2;
  max-width: 15em;
}

.page-about .about-hero__summary {
  margin: 0;
  max-width: 46em;
  font-size: 1rem;
  color: rgba(255, 249, 240, 0.92);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 2rem 1.25rem 4rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.page-about .about-track__inner {
  background: var(--about-paper);
  border: 1px dashed var(--about-border-strong);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  box-shadow: var(--shadow-sm);
}

.page-about .about-track__label {
  margin: 0 0 0.85rem;
  padding: 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.page-about .about-track__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .about-track__link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--about-border);
  border-radius: 999px;
  background: var(--cream);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.85rem;
  transition: background 0.2s, box-shadow 0.2s;
}

.page-about .about-track__link span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--strawberry);
}

.page-about .about-track__link:hover,
.page-about .about-track__link:focus-visible {
  background: var(--peach);
  box-shadow: 0 2px 10px rgba(255, 77, 109, 0.18);
  outline: none;
}

.page-about .about-track__fact {
  display: none;
  margin-top: 1.25rem;
  padding: 1.25rem 1rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--peach), var(--sakura));
  text-align: center;
  color: var(--ink);
}

.page-about .about-track__fact-num {
  margin: 0;
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--strawberry);
  line-height: 1;
}

.page-about .about-track__fact-num span {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-left: 0.1rem;
}

.page-about .about-track__fact p {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
}

.page-about .about-track .btn {
  margin-top: 1rem;
  width: 100%;
}

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

.page-about .about-section {
  position: relative;
  background: var(--about-paper);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.1rem;
  margin-bottom: 1.8rem;
  box-shadow: var(--shadow-md);
  outline: 1px solid var(--about-border);
  outline-offset: 4px;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.page-about .about-section:target {
  animation: about-target-flash 1.6s ease-out;
}

@keyframes about-target-flash {
  0% {
    box-shadow: 0 0 0 6px rgba(255, 77, 109, 0.3), var(--shadow-md);
  }
  100% {
    box-shadow: var(--shadow-md);
  }
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--about-border);
}

.page-about .about-section__index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--strawberry);
  font-weight: 700;
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-section__body .prose {
  font-size: 0.98rem;
  color: var(--ink);
}

.page-about .about-section__body .prose p {
  margin: 0 0 0.85rem;
}

.page-about .about-section__body .prose ul {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
}

.page-about .about-section__body .prose li {
  margin-bottom: 0.4rem;
}

.page-about .about-timeline {
  position: relative;
  margin: 2rem 0 0.5rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--peach), var(--strawberry));
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.page-about .about-timeline__node {
  position: relative;
  z-index: 1;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 30% 28%, #ff86a0, var(--strawberry) 62%);
  color: var(--cream);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.82rem;
  box-shadow: 0 0 0 5px var(--sakura), 0 4px 14px rgba(255, 77, 109, 0.32);
}

.page-about .about-timeline__node::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 9px;
  height: 9px;
  background: var(--matcha);
  border-radius: 2px 1px 5px 1px;
}

.page-about .about-timeline__detail {
  background: var(--cream);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  align-self: center;
  transition: box-shadow 0.2s;
}

.page-about .about-timeline__detail:hover {
  box-shadow: 0 4px 14px rgba(255, 77, 109, 0.12);
}

.page-about .about-timeline__detail summary {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  padding: 0.85rem 0.9rem;
  cursor: pointer;
  list-style: none;
}

.page-about .about-timeline__detail summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__grab {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--strawberry);
  line-height: 1.4;
}

.page-about .about-timeline__meta {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.page-about .about-timeline__phase {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.page-about .about-timeline__title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__detail[open] summary .about-timeline__grab {
  transform: rotate(45deg);
  display: inline-block;
}

.page-about .about-timeline__detail p {
  margin: 0;
  padding: 0 1rem 0.9rem 1.85rem;
  font-size: 0.92rem;
  color: var(--ink);
  max-width: 46em;
}

.page-about .about-timeline__break {
  position: relative;
  margin: 2.4rem 0.4rem 1rem;
  padding: 0.5rem;
  background: var(--cream);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-border);
  box-shadow: var(--shadow-md);
}

.page-about .about-timeline__break img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .about-timeline__break figcaption {
  padding: 0.5rem 0.4rem 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: center;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.page-about .about-grade__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-top: 1.4rem;
}

.page-about .about-grade__card {
  padding: 1.2rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--cream);
  border: 1px solid var(--about-border);
  border-top: 4px solid var(--strawberry);
}

.page-about .about-grade__card--a {
  border-top-color: var(--peach);
}

.page-about .about-grade__card--b {
  border-top-color: var(--matcha);
}

.page-about .about-grade__card--c {
  border-top-color: var(--honey);
}

.page-about .about-grade__letter {
  display: block;
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--strawberry);
  margin-bottom: 0.45rem;
}

.page-about .about-grade__card--a .about-grade__letter,
.page-about .about-grade__card--b .about-grade__letter,
.page-about .about-grade__card--c .about-grade__letter {
  color: var(--dark-berry);
}

.page-about .about-grade__card h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  color: var(--ink);
}

.page-about .about-grade__card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--ink);
  line-height: 1.6;
}

.page-about .about-version {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
  margin-top: 1.5rem;
}

.page-about .about-version__table {
  display: grid;
  gap: 0.55rem;
}

.page-about .about-version__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.2rem;
  background: var(--cream);
  border: 1px solid var(--about-border);
  border-left: 4px solid var(--peach);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  transition: border-color 0.2s, transform 0.2s;
}

.page-about .about-version__row:hover,
.page-about .about-version__row:focus-within {
  border-left-color: var(--strawberry);
  transform: translateX(4px);
}

.page-about .about-version__term {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.page-about .about-version__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.page-about .about-version__term strong {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--strawberry);
  letter-spacing: 0.02em;
}

.page-about .about-version__tip {
  display: none;
  font-size: 0.68rem;
  padding: 0.14rem 0.5rem;
  background: var(--peach);
  border-radius: 999px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.page-about .about-version__desc {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink);
  line-height: 1.55;
}

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

.page-about .about-version__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  aspect-ratio: 2 / 3;
  object-fit: cover;
}

.page-about .about-version__figure figcaption {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-align: center;
}

.page-about .about-revision__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin: 1.4rem 0 1.2rem;
}

.page-about .about-revision__step {
  background: var(--cream);
  border: 1px dashed var(--about-border-strong);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
}

.page-about .about-revision__step p {
  margin: 0.55rem 0 0;
  font-size: 0.94rem;
  color: var(--ink);
  line-height: 1.6;
}

.page-about .about-revision__step strong {
  color: var(--ink);
}

.page-about .about-revision__note {
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: var(--sakura);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
}

.page-about .about-closing {
  position: relative;
  overflow: hidden;
  margin-top: 0.5rem;
  background: linear-gradient(135deg, var(--sakura), var(--peach));
  border-radius: var(--radius-lg);
  padding: 2rem 1.4rem;
  border: 1px solid var(--about-border-strong);
  box-shadow: var(--shadow-md);
}

.page-about .about-closing::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -50px;
  width: 180px;
  height: 180px;
  background: var(--honey);
  opacity: 0.16;
  border-radius: 50%;
}

.page-about .about-closing__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-closing h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--ink);
}

.page-about .about-closing p {
  margin: 0.5rem 0;
  font-size: 0.96rem;
  color: var(--ink);
  max-width: 40em;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.4rem 0;
}

.page-about .about-closing__contact {
  font-size: 0.88rem !important;
  color: var(--dark-berry) !important;
}

.page-about .about-closing__icp {
  margin-top: 1rem;
  padding-top: 0.6rem;
  border-top: 1px solid rgba(31, 26, 28, 0.12);
  font-family: var(--font-mono);
  font-size: 0.75rem !important;
  color: var(--text-secondary) !important;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    min-height: 560px;
  }

  .page-about .about-hero__content {
    padding: 4rem 2rem;
  }

  .page-about .about-section {
    padding: 1.8rem 1.6rem;
  }

  .page-about .about-version {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
  }

  .page-about .about-version__tip {
    display: inline-block;
  }

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

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

  .page-about .about-closing {
    padding: 2.4rem 2rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 3rem;
    padding: 3rem 2rem 5rem;
  }

  .page-about .about-track__inner {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    padding: 1.6rem 1.25rem;
  }

  .page-about .about-track__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.2rem;
  }

  .page-about .about-track__link {
    display: flex;
    width: 100%;
    border: none;
    border-left: 3px solid transparent;
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem;
    background: transparent;
    font-size: 0.92rem;
  }

  .page-about .about-track__link:hover,
  .page-about .about-track__link:focus-visible {
    background: var(--peach);
    border-left-color: var(--strawberry);
    box-shadow: none;
  }

  .page-about .about-track__fact {
    display: block;
  }

  .page-about .about-section__title {
    font-size: 1.6rem;
  }

  .page-about .about-timeline__meta {
    flex-direction: row;
    align-items: baseline;
    gap: 0.6rem;
  }

  .page-about .about-timeline__phase {
    font-size: 0.72rem;
  }

  .page-about .about-timeline__title {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-section:target,
  .page-about .about-version__row,
  .page-about .about-track__link {
    animation: none;
    transition: none;
  }
}