.page-about {
  --about-rail: 230px;
  --about-paper-line: rgba(7, 28, 23, 0.14);
  --about-paper-text: rgba(7, 28, 23, 0.82);
  --about-paper-soft: rgba(7, 28, 23, 0.58);
  display: block;
  background: var(--ink-900);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 3rem) 0 clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(130% 120% at 88% -20%, rgba(53, 242, 208, 0.16), transparent 62%),
    linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset-inline-end: -12%;
  top: -34%;
  width: min(560px, 74%);
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, rgba(255, 122, 26, 0.18), rgba(53, 242, 208, 0.06));
  clip-path: polygon(0 0, 100% 0, 100% 70%, 0 100%);
  transform: rotate(-16deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  bottom: 0;
  width: min(320px, 46%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 242, 208, 0));
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--silver);
  margin-bottom: clamp(1rem, 3vw, 1.8rem);
}

.page-about .about-hero__crumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--line-strong);
}

.page-about .about-hero__crumb .breadcrumb__sep {
  margin: 0 0.5rem;
  color: var(--steel);
}

.page-about .about-hero__kicker {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.6vw, 4.9rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(1.1rem, 3vw, 1.8rem) 0 0;
  max-width: 62ch;
  font-size: clamp(0.95rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1.2rem;
}

.page-about .about-hero__fact {
  padding-left: 0.8rem;
  border-left: 1px solid var(--line);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3.4vw, 1.7rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--cyan);
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 0;
  padding-top: clamp(1rem, 3vw, 2rem);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

/* ---------- 侧栏 ---------- */
.page-about .about-rail {
  position: relative;
  padding-bottom: 1.2rem;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__label {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

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

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
  border-color: var(--line-strong);
  background: rgba(53, 242, 208, 0.06);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--line-strong);
  background: rgba(53, 242, 208, 0.09);
}

.page-about .about-rail__link[aria-current="true"] .about-rail__idx {
  color: var(--orange);
}

.page-about .about-rail__note {
  display: none;
  margin: 1.4rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 暖纸文章区 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--ink-900);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: clamp(1.15rem, 4vw, 3.2rem);
  box-shadow: var(--shadow-sm);
}

.page-about .chapter {
  padding-block: clamp(1.5rem, 4vw, 2.6rem);
  border-top: 1px solid var(--about-paper-line);
  scroll-margin-top: clamp(4.5rem, 10vw, 6.5rem);
}

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

.page-about .chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.4rem 0.9rem;
  align-items: start;
  margin-bottom: clamp(0.9rem, 2.5vw, 1.4rem);
}

.page-about .chapter__num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 5.5vw, 3.1rem);
  line-height: 0.95;
  color: rgba(12, 42, 34, 0.24);
  letter-spacing: -0.03em;
}

.page-about .chapter__eyebrow {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: rgba(7, 28, 23, 0.5);
  text-transform: uppercase;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.15rem, 3.2vw, 1.7rem);
  line-height: 1.4;
  color: var(--ink-800);
  letter-spacing: 0.005em;
}

.page-about .chapter__body p {
  margin: 0 0 0.9rem;
  font-size: clamp(0.94rem, 1.5vw, 1.02rem);
  line-height: 1.85;
  color: var(--about-paper-text);
  max-width: 74ch;
}

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

.page-about .chapter__body a {
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 26, 0.55);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .chapter__body a:hover,
.page-about .chapter__body a:focus-visible {
  color: #b8520b;
  border-bottom-color: var(--orange);
}

.page-about .chapter__body a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.5);
}

.page-about .about-linkrow {
  margin-top: 1rem !important;
  font-size: 0.88rem !important;
  color: var(--about-paper-soft) !important;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-paper-line);
  background: var(--ink-800);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-figure__cap {
  padding: 0.6rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.6;
  color: var(--silver);
  border-top: 1px solid var(--line);
}

.page-about .about-figure--wide {
  margin-top: 1.4rem;
}

/* ---------- 岗位列表 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 1.2rem 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-roles__item {
  display: grid;
  gap: 0.15rem;
  padding: 0.7rem 0.9rem;
  border-left: 2px solid rgba(12, 42, 34, 0.35);
  background: rgba(217, 205, 187, 0.3);
}

.page-about .about-roles__name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-800);
}

.page-about .about-roles__desc {
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--about-paper-soft);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: 1.6rem 0 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--cyan);
}

.page-about .about-quote p {
  margin: 0 0 0.5rem !important;
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.15rem) !important;
  line-height: 1.7 !important;
  color: var(--ink-800) !important;
  max-width: 52ch;
}

.page-about .about-quote__cite {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  background: var(--orange);
  color: var(--orange-ink);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-style: normal;
  letter-spacing: 0.08em;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.35rem 1.5rem;
  border-left: 1px solid var(--about-paper-line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 0.5rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 208, 0.25);
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #b8520b;
}

.page-about .about-timeline__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(0.98rem, 2vw, 1.1rem);
  line-height: 1.5;
  color: var(--ink-800);
}

.page-about .about-timeline__desc {
  margin: 0 !important;
  font-size: 0.9rem !important;
  line-height: 1.75 !important;
  color: var(--about-paper-soft) !important;
}

/* ---------- 三条体验线 ---------- */
.page-about .about-lanes {
  display: grid;
  gap: 0.7rem;
  margin-bottom: 1.2rem;
}

.page-about .about-lane {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  grid-template-areas:
    "mark title"
    "mark desc"
    "mark go";
  gap: 0.3rem 0.8rem;
  padding: 1rem 1rem 1rem 0;
  border: 1px solid var(--about-paper-line);
  border-left: 3px solid rgba(12, 42, 34, 0.32);
  background: rgba(217, 205, 187, 0.22);
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-lane__mark {
  grid-area: mark;
  align-self: start;
  justify-self: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: rgba(12, 42, 34, 0.3);
}

.page-about .about-lane__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink-800);
}

.page-about .about-lane__desc {
  grid-area: desc;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--about-paper-soft);
}

.page-about .about-lane__go {
  grid-area: go;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: #b8520b;
}

.page-about .about-lane:hover {
  transform: translateY(-2px);
  border-left-color: var(--cyan);
  background: rgba(217, 205, 187, 0.4);
}

.page-about .about-lane:hover .about-lane__go {
  color: var(--orange);
}

.page-about .about-lane:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.55);
}

/* ---------- 数据指标 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 0 0 1.3rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
}

.page-about .about-metrics__item {
  background: var(--paper);
  padding: 0.9rem 0.8rem;
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink-800);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--about-paper-soft);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(1.4rem, 4vw, 2.4rem);
  padding: clamp(1.2rem, 3.5vw, 2.2rem);
  background:
    radial-gradient(120% 140% at 90% 0%, rgba(53, 242, 208, 0.16), transparent 58%),
    var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--paper);
}

.page-about .about-cta__label {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .about-cta__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.1rem, 3.2vw, 1.6rem);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-cta__desc {
  margin: 0 0 1.1rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--silver);
  max-width: 56ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-cta__btn {
  text-decoration: none;
}

.page-about .about-cta__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(255, 209, 102, 0.55);
}

/* ---------- 断点 ---------- */
@media (min-width: 40rem) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 1.6rem;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-figure--wide {
    max-width: 720px;
  }
}

@media (min-width: 62rem) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.6rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(4.5rem, 7vw, 6rem);
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__item {
    flex: 1 1 auto;
  }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    padding: 0.55rem 0.6rem;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    font-size: 0.76rem;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible,
  .page-about .about-rail__link[aria-current="true"] {
    border-left-color: var(--cyan);
  }

  .page-about .about-rail__note {
    display: block;
  }

  .page-about .about-paper {
    padding: clamp(1.8rem, 3.2vw, 3.4rem);
  }

  .page-about .chapter__num {
    font-size: clamp(2.4rem, 4vw, 3.6rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-lane,
  .page-about .about-rail__link,
  .page-about .about-hero__crumb a,
  .page-about .chapter__body a {
    transition: none;
  }

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