.page-about {
  --about-rail: 248px;
  background: var(--ink-0);
  color: var(--white);
  font-family: var(--font-body);
}

.page-about .about-crumbs {
  padding: 18px 0 0;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--teal);
}

.page-about .breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin-top: 16px;
  padding: 26px 0 34px;
  border-bottom: 1px solid var(--line-soft);
  background-image:
    radial-gradient(760px 360px at 88% -12%, rgba(59, 245, 212, 0.16), transparent 68%),
    linear-gradient(180deg, rgba(10, 46, 40, 0.92), rgba(4, 27, 24, 0) 76%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-hero h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7.4vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lede {
  margin: 16px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero .btn-row {
  margin-top: 22px;
}

.page-about .about-hero__panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  padding: 18px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 46px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 44px;
  }
}

/* ---------- 分屏与章节索引 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 28px;
  padding: 32px 0 60px;
  align-items: start;
}

.page-about .about-rail {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  padding: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .spy-link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  border-radius: 6px;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) ease, background var(--dur) ease, border-color var(--dur) ease;
}

.page-about .spy-link:hover,
.page-about .spy-link:focus-visible {
  color: var(--white);
  background: var(--glass-strong);
}

.page-about .spy-link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(59, 245, 212, 0.08);
}

.page-about .spy-link__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--teal);
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 46px;
    padding: 46px 0 78px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
  }

  .page-about .about-rail__list {
    grid-template-columns: 1fr;
  }
}

/* ---------- 正文区块 ---------- */
.page-about .about-block {
  padding: 30px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-block h2 {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-block p {
  max-width: 62ch;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-block .about-block__lead {
  color: var(--white);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-block strong {
  color: var(--white);
  font-weight: 600;
}

.page-about .about-quote {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--glass);
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--white);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-1);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .about-donut {
  position: relative;
  width: 100%;
  max-width: 220px;
  margin: 0 auto;
}

.page-about .about-donut svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-donut__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.page-about .about-donut__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  line-height: 1;
  color: var(--white);
}

.page-about .about-donut__unit {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-legend li:last-child {
  border-bottom: 0;
}

.page-about .about-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .about-legend__dot--a {
  background: var(--cyan);
}

.page-about .about-legend__dot--b {
  background: var(--teal);
}

.page-about .about-legend__dot--c {
  background: var(--gold);
}

.page-about .about-legend__role {
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
}

.page-about .about-legend__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--cyan);
}

.page-about .about-legend__desc {
  grid-column: 2 / -1;
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: center;
    gap: 30px;
  }

  .page-about .about-donut {
    margin: 0;
  }
}

/* ---------- 归档流程 ---------- */
.page-about .about-steps {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  transition: border-color var(--dur) ease, background var(--dur) ease;
}

.page-about .about-step:hover {
  border-color: rgba(59, 245, 212, 0.5);
  background: var(--glass-strong);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1.2;
  color: var(--teal);
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-step p {
  max-width: none;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 22px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--teal) 52%, rgba(243, 184, 75, 0.78));
}

.page-about .about-tl {
  position: relative;
  padding-bottom: 16px;
}

.page-about .about-tl:last-child {
  padding-bottom: 0;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(59, 245, 212, 0.1);
}

.page-about .about-tl__card {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  transition: border-color var(--dur) ease, background var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-tl__card:hover,
.page-about .about-tl__card:focus-within,
.page-about .about-tl__card:focus-visible {
  border-color: rgba(59, 245, 212, 0.55);
  background: var(--glass-strong);
  transform: translateX(2px);
  outline: none;
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-tl h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-tl p {
  max-width: 58ch;
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-tl .about-tl__extra {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  line-height: 1.75;
  color: var(--teal);
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-tl__extra {
    max-height: 0;
    padding-top: 0;
    opacity: 0;
    overflow: hidden;
    border-top-color: transparent;
    transition: max-height 200ms ease, opacity 200ms ease, padding-top 200ms ease;
  }

  .page-about .about-tl__card:hover .about-tl__extra,
  .page-about .about-tl__card:focus-within .about-tl__extra,
  .page-about .about-tl__card:focus .about-tl__extra {
    max-height: 140px;
    padding-top: 8px;
    opacity: 1;
    border-top-color: var(--line-soft);
  }
}

/* ---------- 服务准则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  background: var(--ink-1);
  transition: background var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-principle--b {
  border-top-color: var(--teal);
}

.page-about .about-principle--c {
  border-top-color: var(--gold);
}

.page-about .about-principle:hover {
  background: var(--glass-strong);
}

.page-about .about-principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .about-principle h3 {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-principle p {
  max-width: none;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ---------- 联系区块 ---------- */
.page-about .about-contact {
  margin-top: 20px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(10, 46, 40, 0.95), rgba(4, 27, 24, 0.95));
}

.page-about .about-contact__row {
  display: grid;
  gap: 12px;
}

.page-about .about-contact__box {
  padding: 14px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.page-about .about-contact__label {
  max-width: none;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-contact__value {
  max-width: none;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  line-height: 1.5;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .about-contact__hint {
  max-width: none;
  margin: 0;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-contact .copy-btn {
  font-family: var(--font-body);
  font-size: 12px;
}

.page-about .about-links {
  display: grid;
  gap: 2px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 4px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--white);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--teal);
  transition: color var(--dur) ease;
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: rgba(59, 245, 212, 0.5);
}

.page-about .about-links a:hover::after,
.page-about .about-links a:focus-visible::after {
  color: var(--cyan);
}

@media (min-width: 720px) {
  .page-about .about-contact {
    padding: 22px;
  }

  .page-about .about-contact__row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}
</<PAGE_CSS>>>