.page-about {
  --about-hairline: rgba(61, 242, 210, 0.16);
  --about-body: rgba(244, 247, 249, 0.85);
  --about-body-soft: rgba(244, 247, 249, 0.76);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 0;
  overflow: hidden;
  border-bottom: 1px solid var(--ink-700);
  background:
    radial-gradient(circle at 84% 14%, rgba(61, 242, 210, 0.13), transparent 46%),
    radial-gradient(circle at 8% 78%, rgba(255, 138, 61, 0.08), transparent 40%),
    var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(61, 242, 210, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(61, 242, 210, 0.07) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: 28px;
}

.page-about .about-hero__mark {
  display: none;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 7vw, 56px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .breadcrumb__link {
  color: var(--grey-blue);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: var(--ink-700);
}

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

.page-about .about-facts {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 32px 0 0;
  padding: 0 0 40px;
}

.page-about .about-facts__item {
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-facts__label {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--grey-blue);
}

.page-about .about-facts__value {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-scroll {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 44px;
  padding-bottom: 64px;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  display: grid;
  gap: 52px;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  position: relative;
  min-width: 0;
  transition: transform 420ms var(--ease), opacity 420ms var(--ease);
}

.page-about .about-sec__head {
  display: grid;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.8vw, 34px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-sec__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey-blue);
}

.page-about .about-sec__aside {
  display: none;
}

.page-about .about-sec__text {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-sec__text--tight {
  margin-top: 22px;
  margin-bottom: 0;
  color: var(--about-body-soft);
}

.page-about .about-list {
  display: grid;
  gap: 12px;
  max-width: 44em;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-list li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body-soft);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.68em;
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--cyan);
  border-radius: 50%;
}

/* ---------- 编号体系 ---------- */
.page-about .about-codes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-code {
  padding: 22px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-code:hover,
.page-about .about-code:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .about-code h3 {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-code p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-body-soft);
}

.page-about .about-code__tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  background: rgba(61, 242, 210, 0.12);
  border: 1px solid rgba(61, 242, 210, 0.36);
  border-radius: 999px;
}

.page-about .about-code--tl .about-code__tag {
  color: var(--orange);
  background: rgba(255, 138, 61, 0.12);
  border-color: rgba(255, 138, 61, 0.42);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
}

.page-about .about-metrics > div {
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .about-metrics dt {
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--grey-blue);
}

.page-about .about-metrics dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 校对流程 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-step {
  position: relative;
  padding: 22px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
  background: linear-gradient(170deg, rgba(61, 242, 210, 0.06), transparent 58%), var(--ink-800);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .about-step__num {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 17.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-body-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team {
  padding: 20px;
  border: 1px dashed var(--ink-700);
  border-radius: var(--radius-md);
  background: rgba(17, 40, 61, 0.62);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  border-color: var(--cyan);
  background: rgba(17, 40, 61, 0.92);
}

.page-about .about-team h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-body-soft);
}

.page-about .about-team__out {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px solid var(--ink-700);
  font-size: 12px !important;
  line-height: 1.65 !important;
  letter-spacing: 0.03em;
  color: var(--grey-blue) !important;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 26px;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--ink-700);
}

.page-about .about-timeline li {
  position: relative;
}

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
}

.page-about .about-tl__year {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-tl__phase {
  padding: 2px 9px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grey-blue);
  border: 1px solid var(--ink-700);
  border-radius: 999px;
}

.page-about .about-tl__title {
  margin: 6px 0 4px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl__desc {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-body-soft);
}

/* ---------- 协作流程 ---------- */
.page-about .about-flowline {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flowline li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--ink-800);
  border-left: 2px solid var(--orange);
}

.page-about .about-flowline .mono {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-flowline p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 22px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
  background: var(--ink-800);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--grey-blue);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding: 48px 0 56px;
  border-top: 1px solid var(--ink-700);
  background: linear-gradient(180deg, var(--ink-900), #08141f);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 4.6vw, 30px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 10px 0 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body-soft);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-link--solid {
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-link--solid:hover,
.page-about .about-link--solid:focus-visible {
  color: var(--ink-900);
  background: var(--cyan-deep);
  border-color: var(--cyan-deep);
}

.page-about .about-link--warm {
  color: var(--orange);
  border-color: rgba(255, 138, 61, 0.54);
}

.page-about .about-link--warm:hover,
.page-about .about-link--warm:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  .page-about .about-codes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -16px;
    width: 16px;
    border-top: 2px dashed rgba(61, 242, 210, 0.5);
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: center;
    column-gap: 40px;
  }

  .page-about .about-hero__mark {
    display: block;
    justify-self: end;
    width: 100%;
    max-width: 260px;
  }

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

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-sec__text {
    font-size: 16.5px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-scroll {
    grid-template-columns: 176px minmax(0, 1fr);
    column-gap: 56px;
    padding-top: 64px;
    padding-bottom: 80px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-left: 18px;
  }

  .page-about .about-rail__line {
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 1px;
    background: linear-gradient(to bottom, var(--cyan), var(--ink-700) 58%, transparent);
  }

  .page-about .about-rail__label {
    margin: 0;
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--grey-blue);
  }

  .page-about .about-rail__ticks {
    display: grid;
    gap: 12px;
    margin: 14px 0 0;
    padding: 0;
    list-style: none;
  }

  .page-about .about-rail__tick {
    position: relative;
  }

  .page-about .about-rail__tick::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 0.62em;
    width: 7px;
    height: 7px;
    border: 1px solid var(--cyan);
    border-radius: 50%;
    background: var(--ink-900);
  }

  .page-about .about-rail__ticks a {
    display: flex;
    gap: 8px;
    align-items: baseline;
    font-size: 13px;
    color: var(--grey-blue);
    text-decoration: none;
    transition: color 180ms var(--ease);
  }

  .page-about .about-rail__ticks a .mono {
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--slate);
  }

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

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

  .page-about .about-flow {
    gap: 84px;
  }

  .page-about .about-timeline {
    padding-left: 28px;
  }

  .page-about .about-timeline li:nth-child(even) {
    margin-left: 40px;
  }

  .page-about .about-timeline li::before {
    left: -34px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-sec__aside {
    display: block;
    position: absolute;
    top: 2px;
    right: -22px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.28em;
    color: rgba(157, 176, 190, 0.45);
    user-select: none;
  }

  .page-about .about-sec__head {
    padding-right: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-sec,
  .page-about .about-code,
  .page-about .about-step,
  .page-about .about-team,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-code:hover,
  .page-about .about-code:focus-within,
  .page-about .about-step:hover,
  .page-about .about-step:focus-within,
  .page-about .about-link:hover,
  .page-about .about-link:focus-visible {
    transform: none;
  }
}