.page-about {
  --about-cut: 18px;
  --about-rail: 236px;
  background: var(--ink-1);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(20px, 4vw, 40px) 0 clamp(44px, 7vw, 92px);
  background:
    radial-gradient(90% 120% at 8% 0%, rgba(47, 224, 206, 0.12), transparent 62%),
    radial-gradient(70% 90% at 94% 8%, rgba(240, 180, 90, 0.08), transparent 60%),
    linear-gradient(180deg, var(--ink-0) 0%, var(--ink-1) 72%, var(--ink-1) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  margin-top: clamp(26px, 5vw, 56px);
}

.page-about .about-hero__index {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .about-hero__index-num {
  font-family: var(--font-serif);
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1;
  letter-spacing: 0;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(32px, 6.4vw, 78px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__side {
  display: grid;
  gap: 20px;
  align-content: end;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.84;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-hero__meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--cyan);
  flex: 0 0 auto;
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

/* ---------- 路线区 ---------- */
.page-about .about-route {
  position: relative;
  padding: clamp(44px, 7vw, 104px) 0 clamp(56px, 8vw, 120px);
  background:
    linear-gradient(180deg, var(--ink-1) 0%, var(--ink-0) 100%);
}

.page-about .about-route__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-route__layout {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

/* 左侧索引 */
.page-about .about-rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  font-size: 13px;
  text-decoration: none;
  color: var(--mist);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-0);
  outline: none;
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link:focus-visible .about-rail__num {
  color: var(--ink-0);
}

/* 右侧叙事 */
.page-about .about-flow {
  position: relative;
  display: grid;
  gap: clamp(38px, 5vw, 76px);
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line-strong) 16%, var(--line) 72%, transparent 100%);
}

.page-about .about-stop {
  position: relative;
  padding-left: clamp(24px, 3.4vw, 46px);
}

.page-about .about-stop::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 15px;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-stop--next::before {
  background: var(--amber);
}

.page-about .about-stop__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin-bottom: 16px;
}

.page-about .about-stop__coord {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1;
  color: var(--amber);
}

.page-about .about-stop__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(21px, 3.1vw, 34px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-stop p {
  margin: 0 0 14px;
  max-width: 47ch;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.8;
  color: var(--paper);
  opacity: 0.82;
}

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

.page-about .about-stop strong {
  font-weight: 500;
  color: var(--cyan);
}

/* 图片框 */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

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

.page-about .about-figure .media-frame__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 版本线 */
.page-about .vline {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .vline__item {
  display: grid;
  gap: 6px 18px;
  padding: 16px 18px;
  background: var(--ink-2);
  border-left: 2px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .vline__item--now {
  border-left-color: var(--amber);
}

.page-about .vline__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .vline__title {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 15px;
  color: var(--paper);
  max-width: none;
  opacity: 1;
}

.page-about .vline__text {
  margin: 0 !important;
  max-width: 44ch !important;
  font-size: 14px !important;
  line-height: 1.72 !important;
  color: var(--mist) !important;
  opacity: 1 !important;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
  margin-top: 8px;
}

.page-about .about-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.page-about .about-tabs .tabbar__btn {
  padding: 8px 14px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-tabs .tabbar__btn:hover {
  color: var(--paper);
  border-color: var(--line-strong);
}

.page-about .about-tabs .tabbar__btn[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-0);
}

.page-about .about-tabpanel {
  margin-top: 16px;
  padding: 18px 20px;
  background: var(--ink-2);
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-tabpanel h4 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-tabpanel p {
  margin: 0;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.82;
}

/* 覆盖图例 */
.page-about .cover-legend {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .cover-legend__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 18px;
  padding: 13px 16px;
  background: var(--ink-1);
  border-left: 2px solid transparent;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .cover-legend__item:hover {
  background: var(--ink-2);
  border-left-color: var(--cyan);
}

.page-about .cover-legend__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .cover-legend__val {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* 下一站 */
.page-about .about-next {
  margin-top: clamp(18px, 3vw, 26px);
  padding: clamp(20px, 3.6vw, 34px);
  background: linear-gradient(135deg, var(--ink-2) 0%, var(--ink-1) 100%);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-next__lede {
  margin: 0 0 18px !important;
  max-width: 40ch !important;
  font-size: 15px !important;
  color: var(--paper) !important;
  opacity: 0.86 !important;
}

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

.page-about .about-next__meta {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

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

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 显现动效 */
.page-about [data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-about [data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(14px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .vline__item {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: start;
    padding: 18px 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    column-gap: clamp(36px, 5vw, 80px);
    align-items: end;
  }

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

  .page-about .about-hero__title {
    grid-column: 1;
  }

  .page-about .about-hero__side {
    grid-column: 2;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

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

  .page-about .about-figure--offset {
    margin-top: 34px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-route__layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(40px, 5vw, 84px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    margin-top: 18px;
    border-top: 1px solid var(--line);
  }

  .page-about .about-rail__list > li {
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 12px 0;
    font-size: 14px;
    justify-content: flex-start;
    background: none;
    border: 0;
    clip-path: none;
    transition: color 0.18s var(--ease), padding-left 0.18s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    color: var(--cyan);
    padding-left: 6px;
  }

  .page-about .about-rail__link:hover .about-rail__num,
  .page-about .about-rail__link:focus-visible .about-rail__num {
    color: var(--amber);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal].is-hidden {
    transition: none;
    opacity: 1;
    transform: none;
  }

  .page-about .about-rail__link {
    transition: none;
  }
}
<<<END>>>