.page-about {
  color: var(--ink);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 3.25rem) 0 clamp(2rem, 6vw, 3.75rem);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__arc {
  position: absolute;
  right: -3rem;
  top: -2.5rem;
  width: 16rem;
  height: 16rem;
  color: var(--violet);
  opacity: 0.34;
  pointer-events: none;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 5.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: 0.02em;
  max-width: 20ch;
  margin: 0.9rem 0 1.4rem;
}

.page-about .about-hero__lede {
  max-width: 40rem;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .about-body {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-top: clamp(2rem, 5vw, 3.25rem);
}

/* ---------- 左侧阶段索引 ---------- */
.page-about .about-index__caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 0.8rem;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.6rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .about-index__num {
  color: var(--violet);
  font-size: 0.7rem;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
  background-color: rgba(245, 195, 107, 0.07);
}

/* ---------- 正文 ---------- */
.page-about .about-section {
  padding-block: clamp(2rem, 5.5vw, 3.5rem);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 2rem;
}

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

.page-about .about-section__kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 0.8rem;
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.4vw, 2.2rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
  margin: 0 0 1.1rem;
  max-width: 24ch;
}

.page-about .about-content p {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--ink);
  max-width: 36rem;
  margin: 0 0 1.15em;
}

.page-about .about-section__lede {
  color: var(--ink-2);
  margin-bottom: 1.4rem;
}

.page-about .about-content p a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(245, 195, 107, 0.42);
  transition: text-decoration-color 0.16s var(--ease);
}

.page-about .about-content p a:hover,
.page-about .about-content p a:focus-visible {
  text-decoration-color: var(--gold);
}

.page-about .about-pull {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(1.25rem, 2.8vw, 1.7rem);
  line-height: 1.72;
  color: var(--ink);
  max-width: 30ch;
  margin: 1.9rem 0 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--violet);
}

/* ---------- 图像 ---------- */
.page-about .about-figure {
  margin: 1.8rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(122, 92, 255, 0.22), transparent 60%),
    var(--void-soft);
}

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

.page-about .about-figure--lead img {
  opacity: 0.78;
  filter: saturate(0.95);
}

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 1.1rem;
  margin-top: 1.6rem;
}

.page-about .about-principle {
  position: relative;
  padding: clamp(1.2rem, 3vw, 1.75rem);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(255, 123, 197, 0.14), transparent 62%),
    linear-gradient(160deg, var(--indigo), #0b0a1c 88%);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-principle:hover,
.page-about .about-principle:focus-within {
  border-color: rgba(245, 195, 107, 0.55);
  transform: translateY(-3px);
}

.page-about .about-principle__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 0.35rem;
}

.page-about .about-principle h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.45rem;
  margin: 0 0 0.7rem;
  color: var(--ink);
}

.page-about .about-principle p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-2);
  margin: 0;
}

.page-about .about-principle__path {
  display: inline-flex;
  align-items: center;
  margin-top: 1rem;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(122, 92, 255, 0.42);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--violet);
  text-decoration: none;
  opacity: 0.55;
  transition: opacity 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-principle__path:hover,
.page-about .about-principle:hover .about-principle__path,
.page-about .about-principle:focus-within .about-principle__path {
  opacity: 1;
  color: var(--gold);
  border-color: rgba(245, 195, 107, 0.55);
}

/* ---------- 纵向轨道时间轴 ---------- */
.page-about .about-eras {
  position: relative;
  overflow: hidden;
  margin-top: 1.7rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(122, 92, 255, 0.2), transparent 55%),
    var(--wine);
}

.page-about .about-eras__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  pointer-events: none;
}

.page-about .about-tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding-left: 2.25rem;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0.55rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--violet), var(--cyan) 48%, var(--gold));
  opacity: 0.72;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0.55rem 0 1.1rem;
  outline: none;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -1.99rem;
  top: 0.8rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--void);
  border: 1px solid var(--violet);
  box-shadow: 0 0 0 3px rgba(122, 92, 255, 0.14);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus::before,
.page-about .about-tl__item:focus-within::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(245, 195, 107, 0.16);
}

.page-about .about-tl__stage {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 0.2rem;
}

.page-about .about-tl__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  margin: 0 0 0.3rem;
  color: var(--ink);
}

.page-about .about-tl__detail {
  margin: 0;
  max-width: 34rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--ink-2);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s var(--ease), opacity 0.24s var(--ease);
}

.page-about .about-tl__item:hover .about-tl__detail,
.page-about .about-tl__item:focus .about-tl__detail,
.page-about .about-tl__item:focus-within .about-tl__detail {
  max-height: 10rem;
  opacity: 1;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.4rem;
}

.page-about .about-team__text p {
  margin-bottom: 1em;
}

.page-about .about-mix {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.6rem;
}

.page-about .about-mix__cell {
  flex: 1 1 9rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  background: rgba(8, 38, 42, 0.6);
}

.page-about .about-mix__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-mix__label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-2);
}

/* ---------- 服务 ---------- */
.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
    gap: 1.75rem;
  }

  .page-about .about-team .about-figure {
    margin-top: 1.8rem;
  }
}

@media (min-width: 820px) {
  .page-about .about-principles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-principle:nth-child(1) {
    grid-column: 1 / span 3;
  }

  .page-about .about-principle:nth-child(2) {
    grid-column: 4 / span 3;
    margin-top: 2.75rem;
  }

  .page-about .about-principle:nth-child(3) {
    grid-column: 2 / span 3;
    margin-top: 0.75rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-index {
    position: sticky;
    top: 2.5rem;
    align-self: start;
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list > li + li {
    margin-top: 0.2rem;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 0.55rem 0.85rem;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background-color: transparent;
    border-left-color: var(--gold);
  }
}

@media (hover: none) {
  .page-about .about-tl__detail {
    max-height: none;
    opacity: 1;
  }

  .page-about .about-principle__path {
    opacity: 0.85;
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__arc {
    width: 10rem;
    height: 10rem;
    right: -3.5rem;
    top: -1.5rem;
    opacity: 0.22;
  }

  .page-about .about-pull {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation: none !important;
  }
}
<<<END>>>