.page-about {
  --paper: #E7ECF2;
  --paper-2: #D1DBE4;
  --paper-ink: #16304A;
  --folder-tab: #FF6B1A;

  position: relative;
  background:
    radial-gradient(1000px 520px at 88% -5%, rgba(0, 240, 255, 0.12), transparent 60%),
    radial-gradient(900px 500px at -8% 55%, rgba(122, 92, 255, 0.09), transparent 55%),
    var(--c-deep-space);
  color: var(--c-text);
  overflow-x: hidden;
  padding-bottom: 1rem;
}

.page-about__tape {
  background: var(--c-ink);
  border-bottom: 1px solid var(--c-line);
}

.page-about__tape .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
  flex-wrap: wrap;
}

.page-about__tape-id {
  font-family: var(--font-num);
  color: var(--c-lime);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.page-about__hero {
  position: relative;
  padding: 2.2rem 0 3rem;
  border-bottom: 1px solid var(--c-line);
}

.page-about__hero::after {
  content: '';
  display: block;
  height: 8px;
  margin-top: 2.4rem;
  background: repeating-linear-gradient(90deg, var(--c-line) 0 12px, transparent 12px 20px);
  opacity: 0.7;
}

.page-about__hero-grid {
  display: grid;
  gap: 2.4rem;
  align-items: start;
}

.page-about__hero-copy .page-lead {
  max-width: 62ch;
  color: var(--c-text-dim);
  margin: 1rem 0 0;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.page-about__filecard {
  position: relative;
  background: linear-gradient(150deg, var(--paper) 0%, var(--paper-2) 100%);
  color: var(--paper-ink);
  padding: 2.4rem 1.4rem 2rem;
  border: 1px solid #AAB6C2;
  box-shadow: 12px 14px 0 rgba(6, 15, 26, 0.55);
  max-width: 360px;
}

.page-about__filecard::after {
  content: '';
  position: absolute;
  left: 14px;
  bottom: 14px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(20, 40, 61, 0.3);
  box-shadow: 16px 0 0 rgba(20, 40, 61, 0.3), 32px 0 0 rgba(20, 40, 61, 0.3);
}

.page-about__filecard-tab {
  position: absolute;
  top: 12px;
  right: 0;
  background: var(--folder-tab);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 0.32rem 0.75rem;
}

.page-about__filecard dl {
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about__filecard dl div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px dashed rgba(20, 40, 61, 0.3);
  padding-bottom: 0.3rem;
}

.page-about__filecard dt {
  font-size: 0.86rem;
  color: rgba(20, 40, 61, 0.72);
}

.page-about__filecard dd {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--paper-ink);
  white-space: nowrap;
}

.page-about__index {
  background: var(--c-ink);
  border-bottom: 1px solid var(--c-line);
}

.page-about__index-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem 1.8rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}

.page-about__index-inner .edge-label {
  color: var(--c-lime);
  font-weight: 700;
  white-space: nowrap;
}

.page-about__index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--c-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about__index-link span {
  font-family: var(--font-num);
  font-size: 0.78rem;
  color: var(--c-text-dim);
  transition: color 0.2s ease;
}

.page-about__index-link:hover,
.page-about__index-link.is-active {
  color: var(--c-orange);
}

.page-about__index-link:hover span,
.page-about__index-link.is-active span {
  color: var(--c-orange);
}

.page-about__section {
  position: relative;
  padding: 3.2rem 0 3.6rem;
  border-bottom: 1px solid var(--c-line);
}

.page-about__section--story {
  background: linear-gradient(180deg, rgba(11, 27, 45, 0.3) 0%, rgba(8, 18, 32, 0.6) 100%);
}

.page-about__section--principles {
  background: linear-gradient(180deg, rgba(8, 18, 32, 0.3) 0%, rgba(15, 36, 56, 0.15) 100%);
}

.page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  margin-bottom: 2.4rem;
}

.page-about__section-no {
  font-family: var(--font-num);
  font-size: 2.3rem;
  font-weight: 700;
  line-height: 1;
  min-width: 54px;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--c-text-dim);
}

@supports not (-webkit-text-stroke: 1px #fff) {
  .page-about__section-no {
    color: var(--c-text-dim);
    opacity: 0.6;
    -webkit-text-stroke: 0;
  }
}

.page-about__section-head h2 {
  margin: 0.35rem 0 0;
  font-size: 1.42rem;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.page-about__story-grid {
  display: grid;
  gap: 2.4rem;
}

.page-about__timeline {
  position: relative;
}

.page-about__tl-item {
  position: relative;
  padding: 0 0 2.6rem 28px;
}

.page-about__tl-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 4px;
  border-left: 2px dashed var(--c-line);
}

.page-about__tl-item:last-child::before {
  height: 20px;
  bottom: auto;
}

.page-about__tl-item::after {
  content: '';
  position: absolute;
  left: -5px;
  top: 10px;
  width: 12px;
  height: 12px;
  transform: rotate(45deg);
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px var(--c-deep-space);
  z-index: 1;
}

.page-about__tl-item:nth-child(even)::after {
  background: var(--c-lime);
}

.page-about__tl-year {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--c-cyan);
  background: rgba(15, 36, 56, 0.85);
  border: 1px solid var(--c-line);
  padding: 0.3rem 0.65rem;
  margin-bottom: 0.8rem;
}

.page-about__tl-body {
  max-width: 58ch;
}

.page-about__tl-body h3 {
  margin: 0 0 0.5rem;
  font-size: 1.08rem;
  line-height: 1.4;
}

.page-about__tl-body p {
  margin: 0;
  color: var(--c-text-dim);
  font-size: 0.94rem;
  line-height: 1.75;
}

.page-about__story-note {
  position: relative;
  align-self: start;
  background: linear-gradient(150deg, var(--paper) 0%, var(--paper-2) 100%);
  color: var(--paper-ink);
  border: 1px solid #AAB6C2;
  box-shadow: 10px 12px 0 rgba(6, 15, 26, 0.45);
  padding: 1.4rem 1.3rem 1.2rem;
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about__story-note .edge-label {
  display: block;
  font-weight: 700;
  color: var(--paper-ink);
  margin-bottom: 0.4rem;
}

.page-about__story-note .cut-diag {
  margin: 1rem 0;
}

.page-about__story-note a {
  color: var(--paper-ink);
  font-weight: 700;
  text-decoration-color: var(--folder-tab);
  text-underline-offset: 4px;
}

.page-about__figure {
  margin: 2.8rem 0 0;
}

.page-about__figure img,
.page-about__data-figure img,
.page-about__principles-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--c-line);
}

.page-about__figure figcaption,
.page-about__data-figure figcaption,
.page-about__principles-figure figcaption {
  font-size: 0.83rem;
  color: var(--c-text-dim);
  margin-top: 0.6rem;
  padding-left: 0.65rem;
  border-left: 3px solid var(--c-violet);
}

.page-about__data-top {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about__data-figure {
  margin: 0;
}

.page-about__data-copy p {
  margin: 0 0 1rem;
  color: var(--c-text-dim);
  line-height: 1.75;
}

.page-about__data-copy p:first-child {
  color: var(--c-text);
  font-size: 1.02rem;
  font-weight: 500;
}

.page-about__data-copy a,
.page-about__data-compare h3 a {
  color: var(--c-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2.6rem;
}

.page-about__stat {
  position: relative;
  background: linear-gradient(180deg, var(--c-dark-sea) 0%, rgba(15, 36, 56, 0.35) 100%);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-cyan);
  padding: 1.3rem 1.1rem 1.2rem;
  transition: transform 0.24s ease, border-color 0.24s ease;
}

.page-about__stat:nth-child(2n) {
  border-top-color: var(--c-lime);
}

@media (hover: hover) {
  .page-about__stat:hover {
    transform: translateY(-3px);
    border-bottom-color: var(--c-cyan);
  }
}

.page-about__stat .stat-num {
  display: block;
  font-size: 2.15rem;
  line-height: 1.1;
  margin: 0.5rem 0 0.2rem;
  color: var(--c-text);
  letter-spacing: -0.01em;
}

.page-about__stat-desc {
  font-size: 0.84rem;
  color: var(--c-text-dim);
}

.page-about__data-compare {
  position: relative;
  margin-top: 2.6rem;
  padding: 2rem 1.5rem 1.4rem;
  background: linear-gradient(140deg, var(--c-dark-sea) 0%, rgba(15, 36, 56, 0.5) 100%);
  border: 1px solid var(--c-line);
}

.page-about__data-compare-tag {
  position: absolute;
  top: 0;
  left: 1rem;
  transform: translateY(-50%);
  background: var(--c-violet);
  color: #fff;
  font-family: var(--font-num);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  padding: 0.28rem 0.75rem;
  white-space: nowrap;
}

.page-about__data-compare h3 {
  margin: 0.4rem 0 0.5rem;
  font-size: 1.12rem;
  line-height: 1.45;
}

.page-about__data-compare > p {
  color: var(--c-text-dim);
  line-height: 1.75;
  margin: 0.4rem 0 1.2rem;
  max-width: 62ch;
}

.page-about__compare-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about__compare-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.6rem;
  padding: 0.75rem 0.2rem;
  border-bottom: 1px solid var(--c-line);
}

.page-about__compare-list span {
  color: var(--c-text-dim);
  font-size: 0.9rem;
}

.page-about__compare-list strong {
  font-family: var(--font-num);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--c-lime);
  text-align: right;
}

.page-about__principles-grid {
  display: grid;
  gap: 2.6rem;
}

.page-about__principles-main {
  max-width: 760px;
}

.page-about__principles-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about__principles-list li {
  position: relative;
  padding: 0 0 2.1rem 3.2rem;
  border-bottom: 1px dashed var(--c-line);
}

.page-about__principles-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0.4rem;
}

.page-about__pr-no {
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--c-line);
  background: var(--c-ink);
  font-family: var(--font-num);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--c-cyan);
  transform: rotate(-6deg);
}

.page-about__principles-list h3 {
  margin: 0.15rem 0 0.5rem;
  font-size: 1.1rem;
  line-height: 1.4;
}

.page-about__principles-list p {
  margin: 0;
  color: var(--c-text-dim);
  font-size: 0.94rem;
  line-height: 1.75;
  max-width: 62ch;
}

.page-about__principles-list a {
  color: var(--c-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about__principles-note {
  margin-top: 2rem;
  padding: 1.2rem 1.4rem;
  background: rgba(0, 240, 255, 0.05);
  border-left: 3px solid var(--c-cyan);
}

.page-about__principles-note .edge-label {
  color: var(--c-lime);
  font-weight: 700;
}

.page-about__principles-note p {
  margin: 0.5rem 0 0;
  color: var(--c-text-dim);
  line-height: 1.7;
}

.page-about__principles-figure {
  margin: 0;
  align-self: start;
  position: relative;
}

.page-about__principles-figure img {
  box-shadow: 10px 12px 0 rgba(6, 15, 26, 0.5);
}

.page-about__eco-grid {
  display: grid;
  gap: 2.4rem;
}

.page-about__eco-copy p {
  margin: 0 0 1.1rem;
  color: var(--c-text-dim);
  line-height: 1.8;
}

.page-about__eco-copy p:first-child {
  color: var(--c-text);
  font-size: 1.04rem;
  font-weight: 500;
}

.page-about__eco-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.page-about__eco-coop {
  background: var(--c-dark-sea);
  border: 1px solid var(--c-line);
  padding: 1.5rem 1.3rem 1.3rem;
  align-self: start;
}

.page-about__eco-coop .edge-label {
  color: var(--c-lime);
  font-weight: 700;
}

.page-about__eco-coop dl {
  margin: 1rem 0 0;
  display: grid;
  gap: 1.1rem;
}

.page-about__eco-coop dt {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--c-text);
}

.page-about__eco-coop dt::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--c-orange);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

.page-about__eco-coop dd {
  margin: 0.32rem 0 0 1.35rem;
  color: var(--c-text-dim);
  font-size: 0.88rem;
  line-height: 1.62;
}

.page-about__archive-close {
  padding: 3.4rem 0 4.4rem;
  background: linear-gradient(180deg, transparent 0%, rgba(8, 18, 32, 0.65) 100%);
}

.page-about__archive-close-inner {
  max-width: 660px;
  margin: 0 auto;
  text-align: center;
}

.page-about__archive-close-inner h2 {
  margin: 0.85rem 0 0.6rem;
  font-size: 1.45rem;
  letter-spacing: 0.02em;
}

.page-about__archive-close-inner p {
  margin: 0 auto 0.4rem;
  color: var(--c-text-dim);
  line-height: 1.75;
  max-width: 46ch;
}

.page-about__archive-close .page-about__eco-actions {
  justify-content: center;
}

@media (min-width: 600px) {
  .page-about__section {
    padding: var(--space-section) 0;
  }

  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__archive-close {
    padding: var(--space-section) 0;
  }
}

@media (min-width: 780px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 3rem;
  }

  .page-about__filecard {
    margin-top: 1rem;
  }
}

@media (min-width: 900px) {
  .page-about__story-grid {
    grid-template-columns: minmax(0, 1fr) 270px;
    gap: 3rem;
  }

  .page-about__data-top {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 3rem;
  }

  .page-about__principles-grid {
    grid-template-columns: minmax(0, 760px) 320px;
    gap: 3rem;
  }

  .page-about__eco-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 3rem;
  }
}