.page-about {
  --ab-line: rgba(35, 199, 192, 0.22);
  --ab-hair: rgba(147, 174, 194, 0.18);
  --ab-glow: rgba(69, 58, 143, 0.38);
  background: var(--deep);
  color: var(--mist);
  font-family: var(--font-body);
  display: block;
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 24px 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(20, 64, 94, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 64, 94, 0.55) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: 0.22;
  -webkit-mask-image: radial-gradient(120% 88% at 50% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 88% at 50% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: -14% 0 auto;
  height: 78%;
  z-index: -1;
  background: radial-gradient(660px 320px at 50% 0%, var(--ab-glow), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  max-width: 940px;
  margin: 0 auto;
  text-align: center;
}

.page-about .about-hero__rule {
  display: block;
  width: 66px;
  height: 2px;
  margin: 0 auto 22px;
  background: linear-gradient(90deg, var(--indigo), var(--orange));
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  color: var(--cyan);
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 5.6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 660px;
  margin: 22px auto 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.88;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 24px;
  margin: 44px auto 0;
  padding: 0;
  max-width: 760px;
  text-align: left;
}

.page-about .about-stats > div {
  border-top: 1px solid var(--ab-line);
  padding-top: 12px;
}

.page-about .about-stats dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--haze);
  margin: 0;
}

.page-about .about-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1.1;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-top: 48px;
  padding-bottom: 24px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-rail__head {
  margin: 0;
  color: var(--haze);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  font-size: 14px;
  line-height: 1.2;
  color: var(--haze);
  text-decoration: none;
  border: 1px solid var(--grid);
  background: var(--panel-2);
  white-space: nowrap;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  transition: color 0.12s ease, border-color 0.12s ease, background-color 0.12s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
}

.page-about .about-rail__list .mono {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--orange);
}

.page-about .about-rail__meta {
  display: grid;
  grid-template-columns: auto auto;
  justify-content: start;
  gap: 4px 16px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .about-rail__meta dt {
  margin: 0;
  color: var(--haze);
}

.page-about .about-rail__meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  padding-bottom: 72px;
  scroll-margin-top: 96px;
}

.page-about .chapter:last-of-type {
  padding-bottom: 32px;
}

.page-about .chapter-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-top: 18px;
  border-top: 2px solid var(--grid);
  margin-bottom: 28px;
}

.page-about .chapter-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
  text-decoration: none;
  padding-top: 6px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.12s ease, color 0.12s ease;
}

.page-about .chapter-num:hover,
.page-about .chapter-num:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .chapter-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.005em;
  margin: 0;
  color: var(--mist);
}

.page-about .chapter-meta {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--haze);
}

.page-about .about-chapter--replay .chapter-head { border-top-color: var(--cyan); }
.page-about .about-chapter--euro .chapter-head { border-top-color: var(--indigo); }
.page-about .about-chapter--cup .chapter-head { border-top-color: var(--wine); }

.page-about .chapter:target .chapter-num {
  color: var(--lime);
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

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

/* ---------- 数据条 ---------- */

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--ab-hair);
  border: 1px solid var(--ab-hair);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--panel-2);
}

.page-about .about-facts .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-facts .label {
  color: var(--haze);
}

/* ---------- 三条内容线 ---------- */

.page-about .about-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 32px;
}

.page-about .about-line {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 20px;
}

.page-about .about-line h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--mist);
}

.page-about .about-line ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .about-line li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--haze);
}

.page-about .about-line li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  background: var(--cyan);
}

.page-about .about-line__rate {
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

/* ---------- 图片 ---------- */

.page-about .about-shot {
  margin: 40px 0 0;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-hair);
  background: var(--panel-2);
}

.page-about .about-shot figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--haze);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-cover {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 28px;
}

.page-about .about-regions {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-regions li {
  border-left: 3px solid var(--grid);
  border-bottom: 1px solid var(--ab-hair);
  padding: 2px 0 14px 14px;
}

.page-about .about-regions li[data-region="euro"] { border-left-color: var(--indigo); }
.page-about .about-regions li[data-region="sa"] { border-left-color: var(--cyan); }
.page-about .about-regions li[data-region="asia"] { border-left-color: var(--lime); }
.page-about .about-regions li[data-region="africa"] { border-left-color: var(--amber); }
.page-about .about-regions li[data-region="cup"] { border-left-color: var(--wine); }

.page-about .about-regions strong {
  display: block;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-regions p {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--haze);
}

.page-about .about-cover__note {
  margin-top: 28px;
}

/* ---------- 版本切换 ---------- */

.page-about .about-vers {
  margin-top: 28px;
}

.page-about .about-vers__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .about-vers__tabs label {
  cursor: pointer;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--haze);
  background: var(--panel-2);
  border: 1px solid var(--grid);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: color 0.12s ease, border-color 0.12s ease, background-color 0.12s ease;
}

.page-about .about-vers__tabs label:hover {
  color: var(--mist);
  border-color: var(--cyan);
}

.page-about #ver-a:checked ~ .about-vers__tabs label[for="ver-a"],
.page-about #ver-b:checked ~ .about-vers__tabs label[for="ver-b"],
.page-about #ver-c:checked ~ .about-vers__tabs label[for="ver-c"] {
  color: var(--deep);
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-vers__panel {
  display: none;
  padding: 24px 22px;
  background: var(--panel-2);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--orange);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}

.page-about #ver-a:checked ~ .about-vers__panels .about-vers__panel[data-ver="a"],
.page-about #ver-b:checked ~ .about-vers__panels .about-vers__panel[data-ver="b"],
.page-about #ver-c:checked ~ .about-vers__panels .about-vers__panel[data-ver="c"] {
  display: block;
}

.page-about .about-vers__panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--mist);
}

.page-about .about-vers__panel p {
  margin: 0 0 1em;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.9;
}

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

.page-about .about-vers__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px !important;
  letter-spacing: 0.04em;
  color: var(--amber) !important;
  opacity: 1 !important;
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-team__side {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-team__block {
  padding: 20px;
  background: var(--panel-2);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

.page-about .about-team__block--lime {
  border-left-color: var(--lime);
}

.page-about .about-team__block .label {
  display: block;
  margin: 0 0 14px;
  color: var(--haze);
}

.page-about .about-team__dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 16px;
  margin: 0;
}

.page-about .about-team__dl dt {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-team__dl dd {
  margin: 0;
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--haze);
}

.page-about .about-team__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.86;
}

/* ---------- 外部协作链接 ---------- */

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--ab-hair);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cover {
    gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 36px 0 72px;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cover {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-vers__panel {
    padding: 30px 28px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    gap: 20px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--ab-hair);
  }

  .page-about .about-rail__list a {
    padding: 9px 0 9px 14px;
    border: 0;
    background: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    clip-path: none;
    white-space: normal;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--cyan);
    background: none;
  }

  .page-about .chapter {
    padding-bottom: 104px;
  }

  .page-about .chapter:last-of-type {
    padding-bottom: 56px;
  }

  .page-about .about-color-rail {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .chapter-num,
  .page-about .about-vers__tabs label {
    transition: none;
  }
}
<<<END>>>