.page-about {
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(90% 60% at 88% 0%, rgba(41, 240, 212, 0.07), transparent 62%),
    radial-gradient(70% 50% at 4% 30%, rgba(43, 27, 90, 0.55), transparent 68%);
}

.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero {
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(28px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  letter-spacing: 0.2em;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 18ch;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 64px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--white);
  background: linear-gradient(104deg, var(--white) 34%, var(--cyan) 128%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line-cyan);
  border-radius: var(--r-s);
  background: rgba(11, 30, 58, 0.55);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-stat__k {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-top: clamp(20px, 3vw, 34px);
}

.page-about .about-side {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-side__label {
  margin: 0;
  color: var(--mist);
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 13px;
  color: var(--white);
  text-decoration: none;
  background: rgba(14, 53, 64, 0.55);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc__list .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-color: var(--line-cyan);
  background: rgba(41, 240, 212, 0.1);
  outline: none;
}

.page-about .about-side__mark {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: rgba(147, 168, 196, 0.5);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.page-about .about-chapter {
  padding: clamp(34px, 5vw, 60px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 140px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
}

.page-about .about-chapter__head {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-chapter__num {
  display: block;
  font-size: clamp(40px, 7vw, 68px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: rgba(41, 240, 212, 0.22);
}

.page-about .about-chapter__title {
  margin: 6px 0 0;
  max-width: 22ch;
  font-size: clamp(23px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-chapter__lead {
  max-width: 62ch;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-chapter__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .about-chapter__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 248, 255, 0.86);
}

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

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure--team {
  margin-top: 24px;
}

.page-about .about-principles-panel {
  margin-top: 6px;
  padding: clamp(18px, 3.4vw, 34px);
  border: 1px solid rgba(147, 168, 196, 0.2);
  border-radius: var(--r-l);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(43, 27, 90, 0.95), rgba(6, 16, 31, 0.98) 72%);
}

.page-about .about-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .principle {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 26px 8px 26px 8px;
  background: rgba(6, 16, 31, 0.6);
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .principle:nth-child(2) {
  border-radius: 8px 26px 8px 26px;
}

.page-about .principle:nth-child(3) {
  border-radius: 26px 26px 8px 26px;
}

.page-about .principle:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .principle__idx {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .principle__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .principle__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 248, 255, 0.8);
}

.page-about .principle__scene {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(147, 168, 196, 0.28);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-chapter__body--team {
  align-items: start;
}

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

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-s);
  background: rgba(11, 30, 58, 0.5);
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .team-row:hover {
  border-color: var(--line-cyan);
  background: rgba(14, 53, 64, 0.75);
}

.page-about .team-row__key {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-row__val {
  font-size: 22px;
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .team-row--cyan .team-row__val {
  color: var(--cyan);
}

.page-about .team-row--orange .team-row__val {
  color: var(--orange);
}

.page-about .team-row--mist .team-row__val {
  color: var(--mist);
}

.page-about .team-row__desc {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-ring-wrap {
  display: flex;
  justify-content: center;
  padding: 8px 0;
}

.page-about .about-ring {
  display: block;
  width: 100%;
  max-width: 258px;
  height: auto;
}

.page-about .ring-seg {
  transition: opacity 0.24s var(--ease);
}

.page-about .about-ring:hover .ring-seg {
  opacity: 0.72;
}

.page-about .about-ring .ring-seg:hover {
  opacity: 1;
}

.page-about .ring-seg--cyan {
  stroke: var(--cyan);
}

.page-about .ring-seg--orange {
  stroke: var(--orange);
}

.page-about .ring-seg--mist {
  stroke: var(--mist);
}

.page-about .ring-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  fill: var(--white);
}

.page-about .ring-cap {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  fill: var(--mist);
}

.page-about .about-paper {
  margin-top: 6px;
  padding: clamp(18px, 3.4vw, 34px);
  border-radius: var(--r-l);
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan-deep), rgba(0, 122, 110, 0.14));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 4px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 15px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cyan-deep);
}

.page-about .about-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  padding: 9px 0;
  cursor: pointer;
  list-style: none;
  color: var(--ink-900);
}

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

.page-about .about-node > summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan-deep);
}

.page-about .about-node[open] > summary::after {
  content: "收起";
}

.page-about .about-node__year {
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(0, 122, 110, 0.12);
  color: var(--cyan-deep);
}

.page-about .about-node__label {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-node__body p {
  margin: 2px 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(6, 16, 31, 0.78);
}

.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-eco__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 248, 255, 0.86);
}

.page-about .about-eco__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .eco-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  background: linear-gradient(120deg, rgba(43, 27, 90, 0.55), rgba(11, 30, 58, 0.4));
}

.page-about .eco-fact__num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .eco-fact__k {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-eco__cta {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-eco__cta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

.page-about .about-eco__cta a:hover {
  color: var(--white);
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  background: rgba(14, 53, 64, 0.42);
}

.page-about .about-step__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-outro {
  margin-top: 28px;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-l);
  background: radial-gradient(110% 120% at 100% 0%, rgba(255, 122, 26, 0.12), rgba(6, 16, 31, 0.6) 62%);
}

.page-about .about-outro__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 641px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .page-about .about-toc__list {
    gap: 10px;
  }
}

@media (min-width: 861px) {
  .page-about .about-chapter__body {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .about-chapter__body--team {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .about-eco {
    grid-template-columns: 1.25fr 0.75fr;
    gap: 28px;
    align-items: start;
  }

  .page-about .about-eco__cta {
    grid-column: 1 / -1;
  }

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

@media (min-width: 901px) {
  .page-about .about-layout {
    grid-template-columns: 214px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: 132px;
    align-self: start;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }

  .page-about .about-toc__list a {
    width: 100%;
    border-radius: var(--r-s);
    border-color: transparent;
    background: transparent;
    padding: 8px 10px;
    border-left: 2px solid var(--line-soft);
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(41, 240, 212, 0.08);
  }

  .page-about .about-side__mark {
    display: block;
    margin-top: 26px;
    align-self: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .team-row,
  .page-about .about-toc__list a,
  .page-about .ring-seg {
    transition: none;
  }

  .page-about .principle:hover {
    transform: none;
  }
}
<<<END>>>