.page-about {
  --about-ink: rgba(242, 247, 244, .8);
  --about-soft: rgba(242, 247, 244, .6);
  color: var(--white);
  background: var(--bg-deep);
  overflow-x: clip;
}

.page-about .about-crumb {
  margin-bottom: clamp(10px, 1.6vw, 18px);
}

.page-about .about-hero {
  position: relative;
  padding-top: clamp(20px, 3.4vw, 44px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 66%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 82% 4%, rgba(198, 255, 61, .16), transparent 58%),
    radial-gradient(ellipse at 6% 0%, rgba(255, 122, 24, .11), transparent 54%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .55;
  background-image: repeating-linear-gradient(112deg, rgba(42, 59, 62, .45) 0 1px, transparent 1px 92px);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 76%);
  mask-image: linear-gradient(180deg, #000, transparent 76%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(12px, 1.8vw, 20px);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 7.2vw, 92px);
  line-height: .98;
  letter-spacing: -.02em;
  transform: skew(-4deg);
  transform-origin: left bottom;
  max-width: 16ch;
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 38em;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.9;
  color: var(--about-ink);
}

.page-about .hero-facts {
  list-style: none;
  margin: clamp(10px, 1.6vw, 18px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: clamp(12px, 1.8vw, 20px);
  background: var(--bg-carbon);
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .fact-key {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: clamp(22px, 3.4vw, 42px) 0 0;
  position: relative;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  clip-path: polygon(0 7%, 100% 0, 100% 100%, 0 93%);
  filter: saturate(.9) contrast(1.06);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  padding-block: clamp(40px, 6vw, 84px);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 6vw, 84px);
  min-width: 0;
}

/* 章节索引 */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
}

.page-about .about-rail ol {
  list-style: none;
  margin: 0;
  padding: 2px 0 6px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail ol::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail li {
  flex: 0 0 auto;
}

.page-about .about-rail a {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--mist);
  font-size: 12.5px;
  line-height: 1.3;
  white-space: nowrap;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .rail-no {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  opacity: .75;
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible,
.page-about .about-rail a.is-active,
.page-about .about-rail li.is-active > a {
  color: var(--lime);
  border-color: rgba(198, 255, 61, .5);
  background: var(--lime-veil);
}

/* 章节结构 */
.page-about .chap {
  position: relative;
  scroll-margin-top: clamp(72px, 12vh, 116px);
}

.page-about .chap-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 6px 14px;
  padding-bottom: clamp(12px, 1.8vw, 18px);
  margin-bottom: clamp(16px, 2.4vw, 26px);
  border-bottom: 1px solid var(--line);
}

.page-about .chap-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--lime);
  padding-top: .55em;
}

.page-about .chap-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-about .chap-sub {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--mist);
}

.page-about .chap-tag {
  display: none;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .3em;
  color: var(--mist);
  opacity: .78;
  padding-top: 3px;
}

.page-about .chap-body p {
  margin: 0 0 1em;
  max-width: 37em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: var(--about-ink);
}

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

.page-about .chap-body .lead-p {
  font-size: clamp(16px, 1.8vw, 18.5px);
  line-height: 1.85;
  color: var(--white);
}

/* 版本时间轴 */
.page-about .arc {
  padding-block: clamp(6px, 1.4vw, 14px);
}

.page-about .arc > *:not(.arc-bg) {
  position: relative;
  z-index: 1;
}

.page-about .arc-bg {
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(200px, 46%, 500px);
  z-index: 0;
  pointer-events: none;
  opacity: .17;
  -webkit-mask-image: linear-gradient(215deg, #000, transparent 78%);
  mask-image: linear-gradient(215deg, #000, transparent 78%);
}

.page-about .arc-bg img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .arc-list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(10px, 1.6vw, 16px);
  z-index: 1;
}

.page-about .arc-list::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 22px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), rgba(198, 255, 61, .22) 62%, var(--line));
}

.page-about .arc-item {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: clamp(10px, 1.6vw, 16px);
  align-items: start;
}

.page-about .arc-node {
  position: relative;
  z-index: 1;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--lime);
  background: var(--bg-pitch);
  border: 1px solid var(--lime);
  border-radius: 50%;
  transition: background .25s ease, color .25s ease, transform .25s ease;
}

.page-about .arc-card {
  min-width: 0;
  padding: clamp(12px, 1.8vw, 18px) clamp(14px, 2.2vw, 20px);
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .28s ease, background .28s ease, transform .28s ease;
}

.page-about .arc-card h3 {
  margin: 0 0 6px;
  font-size: clamp(15px, 1.8vw, 17px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .arc-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink);
}

.page-about .arc-more {
  display: block;
  margin-top: 9px;
  padding-top: 9px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-soft);
  transition: color .28s ease;
}

.page-about .arc-item:hover .arc-node,
.page-about .arc-item:focus-within .arc-node {
  background: var(--lime);
  color: var(--bg-deep);
  transform: scale(1.05);
}

.page-about .arc-item:hover .arc-card,
.page-about .arc-item:focus-within .arc-card {
  background: var(--bg-pitch);
  border-color: rgba(198, 255, 61, .45);
}

.page-about .arc-item:hover .arc-more,
.page-about .arc-item:focus-within .arc-more {
  color: var(--lime);
}

/* 团队 */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  min-width: 0;
}

.page-about .team-main {
  min-width: 0;
}

.page-about .team-bands {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.page-about .team-band {
  min-width: 0;
  min-height: 108px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
  padding: 12px 10px;
  background: var(--bg-pitch);
  border: 1px solid var(--line);
  border-top: 3px solid var(--lime);
  border-radius: var(--radius);
  transition: background .25s ease, border-color .25s ease, transform .25s ease;
}

.page-about .team-band--b { border-top-color: var(--orange); }
.page-about .team-band--c { border-top-color: var(--mist); }
.page-about .team-band--d { border-top-color: var(--line); }

.page-about .team-band:hover {
  background: var(--bg-carbon);
  transform: translateY(-2px);
}

.page-about .band-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--white);
}

.page-about .band-name {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .team-roles {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .team-roles li {
  display: grid;
  gap: 3px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.page-about .team-roles strong {
  font-size: 14px;
  color: var(--white);
  letter-spacing: .02em;
}

.page-about .team-roles span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink);
}

.page-about .team-shot {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06);
}

.page-about .team-shot figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 22px 12px 10px;
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--mist);
  background: linear-gradient(transparent, rgba(7, 26, 22, .92));
}

/* 资料来源 */
.page-about .source-stats {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .source-stat {
  padding: clamp(14px, 2vw, 18px) clamp(14px, 2.2vw, 20px);
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius);
}

.page-about .source-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: .03em;
  color: var(--white);
}

.page-about .source-stat h3 {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .source-stat p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink);
}

.page-about .source-steps {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .source-steps li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: clamp(12px, 1.8vw, 16px);
  background: var(--bg-deep);
}

.page-about .step-no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--lime);
  padding-top: 3px;
}

.page-about .source-steps strong {
  display: block;
  margin-bottom: 3px;
  font-size: 14.5px;
  color: var(--white);
}

.page-about .step-text {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink);
}

/* 三条做法 */
.page-about .rules {
  display: grid;
  gap: 10px;
}

.page-about .rule {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .3s ease, transform .3s ease, background .3s ease;
}

.page-about .rule::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--lime), var(--orange));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .42s ease;
}

.page-about .rule:hover,
.page-about .rule:focus-within {
  border-color: rgba(198, 255, 61, .42);
  background: var(--bg-pitch);
  transform: translateY(-2px);
}

.page-about .rule:hover::after,
.page-about .rule:focus-within::after {
  transform: scaleX(1);
}

.page-about .rule-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .rule h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .rule p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--about-ink);
}

/* 下一步 */
.page-about .chap--next .chap-head {
  border-bottom-color: rgba(198, 255, 61, .35);
}

.page-about .next-links {
  display: grid;
  gap: 10px;
}

.page-about .next-card {
  display: block;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--white);
  transition: background .25s ease, border-color .25s ease, transform .25s ease;
}

.page-about .next-card h3 {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .next-card p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink);
}

.page-about .next-go {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--lime);
}

.page-about .next-card--alert .next-go {
  color: var(--orange);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--bg-pitch);
  border-color: rgba(198, 255, 61, .45);
  transform: translateY(-2px);
}

.page-about .next-card--alert:hover,
.page-about .next-card--alert:focus-visible {
  border-color: rgba(255, 122, 24, .55);
}

@media (min-width: 560px) {
  .page-about .team-bands {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-band {
    min-height: 126px;
  }
  .page-about .team-band--a { flex: 9 1 0; }
  .page-about .team-band--b { flex: 7 1 0; }
  .page-about .team-band--c { flex: 6 1 0; }
  .page-about .team-band--d { flex: 4 1 0; }
}

@media (min-width: 760px) {
  .page-about .chap-tag {
    display: block;
  }
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .source-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .page-about .rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .next-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .team-bands {
    display: flex;
    gap: 4px;
  }
  .page-about .team-band {
    min-width: 0;
  }
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 72px);
  }
  .page-about .about-rail {
    position: sticky;
    top: clamp(76px, 10vh, 120px);
    align-self: start;
  }
  .page-about .about-rail__label {
    margin-bottom: 10px;
  }
  .page-about .about-rail ol {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }
  .page-about .about-rail a {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 9px 8px 9px 12px;
    white-space: normal;
    font-size: 13px;
  }
  .page-about .about-rail a:hover,
  .page-about .about-rail a:focus-visible,
  .page-about .about-rail a.is-active,
  .page-about .about-rail li.is-active > a {
    border-left-color: var(--lime);
  }
  .page-about .hero-facts li {
    padding: clamp(16px, 2vw, 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title {
    transform: none;
  }
  .page-about .rule,
  .page-about .rule::after,
  .page-about .arc-card,
  .page-about .arc-node,
  .page-about .next-card,
  .page-about .team-band {
    transition: none;
  }
  .page-about .rule:hover,
  .page-about .rule:focus-within,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible,
  .page-about .team-band:hover,
  .page-about .arc-item:hover .arc-node {
    transform: none;
  }
}
<<<END>>>