.page-about {
  --about-line: rgba(44, 230, 210, .22);
  --about-chip: rgba(27, 58, 94, .9);
  display: block;
  color: var(--body-copy);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + 34px);
  padding-bottom: 10px;
  background:
    radial-gradient(110% 70% at 6% 0%, rgba(44, 230, 210, .10), transparent 58%),
    radial-gradient(90% 60% at 96% 4%, rgba(255, 122, 46, .08), transparent 60%),
    var(--ink-950);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(155, 243, 232, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155, 243, 232, .045) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .75), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .75), transparent 78%);
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: 24px;
}

.page-about .about-hero__sep {
  margin: 0 8px;
  color: var(--ink-600);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan-200);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper-50);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
  color: var(--body-copy);
}

.page-about .about-hero__stat {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 30px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan-400);
}

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(44px, 12vw, 78px);
  font-weight: 700;
  line-height: .88;
  color: var(--cyan-400);
  text-shadow: 0 0 34px rgba(44, 230, 210, .3);
}

.page-about .about-hero__stat-txt {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-400);
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin: 38px 0 0;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 5;
  object-fit: cover;
}

@media (max-width: 640px) {
  .page-about .about-hero__media img {
    aspect-ratio: 16 / 8;
  }
}

/* ---------- 纵向时间刻度 ---------- */

.page-about .about-tl {
  position: relative;
  padding: 26px 0 60px;
  background: var(--ink-950);
}

.page-about .about-block {
  padding: 34px 0;
}

.page-about .about-block__inner {
  position: relative;
  padding-left: 38px;
}

.page-about .about-block__inner::before {
  content: "";
  position: absolute;
  left: 7px;
  top: -34px;
  bottom: -34px;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-block:first-child .about-block__inner::before {
  top: 6px;
}

.page-about .about-block--last .about-block__inner::before {
  bottom: 60%;
}

.page-about .about-block__inner::after {
  content: "";
  position: absolute;
  left: -1px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--cyan-400);
  background: var(--ink-950);
  box-shadow: 0 0 0 4px rgba(44, 230, 210, .10);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-block:hover .about-block__inner::after {
  transform: scale(1.16);
  box-shadow: 0 0 0 8px rgba(44, 230, 210, .16);
}

.page-about .about-block--last .about-block__inner::after {
  border-color: var(--orange-500);
  box-shadow: 0 0 0 4px rgba(255, 122, 46, .12);
}

.page-about .about-block__stamp {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan-200);
}

.page-about .about-block__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--paper-50);
}

.page-about .about-block__lead {
  max-width: 60ch;
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist-400);
}

.page-about .about-block__prose {
  max-width: 68ch;
}

.page-about .about-block__prose p {
  margin: 0 0 12px;
}

.page-about .about-block__more {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--mist-400);
}

.page-about .about-block__more a {
  color: var(--cyan-400);
  text-underline-offset: 3px;
}

.page-about .about-block__more a:hover {
  color: var(--orange-300);
}

/* ---------- 数据条 ---------- */

.page-about .about-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--ink-600);
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-facts li {
  background: var(--ink-800);
  padding: 16px 18px;
}

.page-about .about-facts__n {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
}

.page-about .about-facts__t {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist-400);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-chip);
}

.page-about .team-row:last-child {
  border-bottom: 1px solid var(--about-chip);
}

.page-about .team-row__chip {
  width: 14px;
  height: 14px;
  margin-top: 5px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, .18);
}

.page-about .team-row__chip--a { background: var(--cyan-400); }
.page-about .team-row__chip--b { background: var(--cyan-200); }
.page-about .team-row__chip--c { background: var(--orange-500); }
.page-about .team-row__chip--d { background: var(--orange-300); }

.page-about .team-row__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--paper-50);
}

.page-about .team-row__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-copy);
}

.page-about .about-team__media {
  margin: 0;
  overflow: hidden;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 校对流程 ---------- */

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

.page-about .about-flow__media {
  margin: 0;
  max-width: 420px;
  overflow: hidden;
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: none;
}

.page-about .flow__step {
  position: relative;
  padding: 16px 18px 18px;
  background: var(--ink-800);
  border: 1px solid var(--ink-600);
  border-left: 2px solid var(--cyan-400);
  border-radius: var(--radius);
  transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease);
}

.page-about .flow__step:hover {
  transform: translateY(-4px);
  border-color: rgba(44, 230, 210, .5);
  border-left-color: var(--orange-500);
  background: #10294a;
  box-shadow: 0 14px 30px rgba(0, 0, 0, .36);
}

.page-about .flow__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange-500);
}

.page-about .flow__title {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--paper-50);
}

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

/* ---------- 版本印记 ---------- */

.page-about .versions {
  display: grid;
  gap: 12px;
  margin-top: 6px;
}

.page-about .version {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .22s var(--ease), transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .version::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--grad-key);
  opacity: .6;
  transition: opacity .22s var(--ease);
}

.page-about .version:hover {
  border-color: rgba(44, 230, 210, .45);
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, .34);
}

.page-about .version:hover::before,
.page-about .version[open]::before {
  opacity: 1;
}

.page-about .version__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px 16px 20px;
  list-style: none;
  cursor: pointer;
}

.page-about .version__summary::-webkit-details-marker {
  display: none;
}

.page-about .version__summary::after {
  content: "+";
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--mist-400);
  transition: color .2s var(--ease);
}

.page-about .version[open] .version__summary::after {
  content: "–";
  color: var(--orange-500);
}

.page-about .version__summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -3px;
  border-radius: var(--radius);
}

.page-about .version__tag {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan-400);
}

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

.page-about .version__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16.5px;
  letter-spacing: -.01em;
  color: var(--paper-50);
}

.page-about .version__when {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist-400);
}

.page-about .version__list {
  list-style: none;
  margin: 0;
  padding: 0 20px 18px 20px;
  display: grid;
  gap: 9px;
}

.page-about .version__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--body-copy);
}

.page-about .version__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 1px;
  background: var(--cyan-400);
}

/* ---------- 适配检查点 ---------- */

.page-about .checks {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .check {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 6px 14px;
  align-items: center;
}

.page-about .check__n {
  grid-row: 1 / span 2;
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--paper-50);
}

.page-about .check__name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--paper-50);
}

.page-about .check__bar {
  display: block;
  height: 5px;
  border-radius: 3px;
  background: rgba(27, 58, 94, .9);
  overflow: hidden;
}

.page-about .check__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: var(--grad-key);
}

.page-about .check__fill--full { width: 100%; }
.page-about .check__fill--mid  { width: 71%; }
.page-about .check__fill--low  { width: 47%; }
.page-about .check__fill--min  { width: 35%; }

.page-about .fit-note {
  margin-top: 26px;
  padding: 18px 20px;
  border: 1px solid var(--ink-600);
  border-left: 2px solid var(--orange-500);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 122, 46, .08), rgba(44, 230, 210, .05)), var(--ink-800);
}

.page-about .fit-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--body-copy);
}

/* ---------- 结尾 CTA ---------- */

.page-about .about-cta {
  display: grid;
  gap: 22px;
  padding: 26px 22px;
  border: 1px solid var(--ink-600);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(44, 230, 210, .10), rgba(255, 122, 46, .10)), var(--ink-800);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--paper-50);
}

.page-about .about-cta__text p {
  max-width: 58ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--body-copy);
}

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

/* ---------- 桌面端 ---------- */

@media (min-width: 780px) {
  .page-about .about-block__inner {
    padding-left: 52px;
  }

  .page-about .about-block {
    padding: 44px 0;
  }

  .page-about .about-block__inner::before {
    top: -44px;
    bottom: -44px;
  }

  .page-about .about-block:first-child .about-block__inner::before {
    top: 8px;
  }

  .page-about .about-hero__stat {
    margin-top: 36px;
  }

  .page-about .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 34px 32px;
    gap: 30px;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: 1.1fr .9fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: .78fr 1.22fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .flow {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .checks {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 34px;
  }

  .page-about .versions {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .page-about .version[open] {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .version,
  .page-about .about-block__inner::after,
  .page-about .version__summary::after {
    transition: none;
  }

  .page-about .flow__step:hover,
  .page-about .version:hover,
  .page-about .about-block:hover .about-block__inner::after {
    transform: none;
  }
}