.page-about {
  --about-rail-col: 58px;
  --about-ink: #dbe9f7;
  --about-ink-soft: #b9cde2;
  --about-gap: clamp(36px, 6vw, 84px);
  background: var(--deep-900);
  color: var(--about-ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-top {
  position: relative;
  padding-block: clamp(104px, 14vw, 172px) clamp(40px, 6vw, 68px);
  background:
    radial-gradient(120% 88% at 86% -12%, rgba(0, 229, 255, .16), transparent 58%),
    radial-gradient(90% 72% at 2% 6%, rgba(255, 107, 74, .12), transparent 62%),
    linear-gradient(180deg, var(--deep-900) 0%, var(--deep-800) 60%, var(--deep-900) 100%);
}

.page-about .about-top::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(27, 72, 120, .34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 72, 120, .34) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(110% 82% at 68% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(110% 82% at 68% 0%, #000 0%, transparent 74%);
  pointer-events: none;
}

.page-about .about-top > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-kicker {
  margin: 22px 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--coral-300);
}

.page-about .about-h1 {
  margin: 0 0 18px;
  max-width: 15em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-top__grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  align-items: end;
}

.page-about .about-top__fig {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--deep-800);
}

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

.page-about .about-top__fig .media__cap {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate-400);
}

@media (min-width: 900px) {
  .page-about .about-top__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

/* ---------- 顶部数据带 ---------- */

.page-about .about-stats {
  list-style: none;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  background: var(--deep-800);
  transition: background 160ms var(--ease);
}

.page-about .about-stat:hover {
  background: var(--deep-700);
}

.page-about .about-stat__n {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 2.8vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-500);
}

.page-about .about-stat--coral .about-stat__n {
  color: var(--coral-500);
}

.page-about .about-stat__k {
  font-size: 12px;
  line-height: 1.5;
  color: var(--slate-400);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

/* ---------- 纵向时间轴主体 ---------- */

.page-about .about-flow {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-sec {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 2vw, 22px);
}

.page-about .about-sec__rail {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-sec__dot {
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, .14);
}

.page-about .about-sec__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-400);
}

.page-about .about-sec__rail::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 5px;
  width: 1px;
  height: var(--about-gap);
  background: linear-gradient(180deg, rgba(0, 229, 255, .42), rgba(0, 229, 255, 0));
  display: none;
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 2.6vw, 31px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-p {
  margin: 0 0 1em;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

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

.page-about .about-p a {
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-p a:hover,
.page-about .about-p a:focus-visible {
  color: var(--cyan-300);
  border-bottom-color: var(--cyan-300);
}

.page-about .about-note {
  margin: 22px 0 0;
  max-width: 40em;
  padding: 14px 18px;
  border-left: 2px solid var(--coral-500);
  border-radius: 0 var(--r-ctl) var(--r-ctl) 0;
  background: rgba(255, 107, 74, .07);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--coral-300);
}

@media (min-width: 860px) {
  .page-about {
    --about-rail-col: 76px;
  }

  .page-about .about-sec {
    grid-template-columns: var(--about-rail-col) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
  }

  .page-about .about-sec__rail {
    align-self: start;
    flex-direction: column;
    justify-content: flex-start;
    gap: 12px;
    padding-top: 6px;
  }

  .page-about .about-sec__rail::after {
    display: block;
    left: 50%;
    transform: translateX(-50%);
  }
}

/* ---------- 纸白长文区 ---------- */

.page-about .about-sec--paper {
  background: var(--paper-50);
  color: var(--ink-900);
  border: 1px solid var(--deep-600);
  border-radius: var(--r-panel);
  padding: clamp(22px, 3.4vw, 46px);
}

.page-about .about-sec--paper .about-sec__dot {
  background: var(--cyan-500);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, .2);
}

.page-about .about-sec--paper .about-sec__idx {
  color: var(--deep-700);
}

.page-about .about-sec--paper .about-sec__rail::after {
  display: none;
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--ink-900);
}

.page-about .about-sec--paper .about-p {
  color: #2c3d4e;
}

/* ---------- 口径折叠条目 ---------- */

.page-about .about-item {
  border-top: 1px solid rgba(27, 72, 120, .38);
}

.page-about .about-item:last-of-type {
  border-bottom: 1px solid rgba(27, 72, 120, .38);
}

.page-about .about-item__q {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 42px 15px 4px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink-900);
  transition: color 160ms var(--ease);
}

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

.page-about .about-item__q::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--deep-600);
  transition: color 160ms var(--ease);
}

.page-about .about-item[open] .about-item__q::after {
  content: "\2212";
}

.page-about .about-item__q:hover::after,
.page-about .about-item__q:focus-visible::after {
  color: var(--coral-500);
}

.page-about .about-item__idx {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--deep-700);
}

.page-about .about-item__a {
  padding: 0 4px 20px;
}

.page-about .about-item__a p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: #33475b;
}

/* ---------- 流程辐射图与配图 ---------- */

.page-about .about-radial__scroll {
  margin: 24px 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
}

.page-about .about-radial {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .about-workflow__fig {
  margin: 26px 0 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--deep-800);
}

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

.page-about .about-workflow__fig .media__cap {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate-400);
}

/* ---------- 时间线列表 ---------- */

.page-about .about-tl {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 24px;
  bottom: 24px;
  width: 1px;
  background: var(--line);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 26px 28px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep-900);
  border: 2px solid var(--lime-400);
}

.page-about .about-tl__item.is-current::before {
  background: var(--lime-400);
  box-shadow: 0 0 0 5px rgba(198, 255, 61, .16);
}

.page-about .about-tl__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(19px, 2.1vw, 25px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--coral-500);
}

.page-about .about-tl__h {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper-50);
}

.page-about .about-tl__text p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  list-style: none;
  margin: 26px 0 26px;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-team__row {
  padding: 20px 22px 22px;
  background: var(--deep-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  transition: border-color 160ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-team__row:hover {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
}

.page-about .about-team__name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
  color: var(--paper-50);
}

.page-about .about-team__n {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .about-bar {
  height: 4px;
  border-radius: var(--r-pill);
  background: var(--deep-700);
  overflow: hidden;
  margin-bottom: 14px;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: var(--cyan-500);
}

.page-about .about-bar__fill--coral {
  background: var(--coral-500);
}

.page-about .about-team__row:nth-child(1) .about-bar__fill {
  width: 50%;
}

.page-about .about-team__row:nth-child(2) .about-bar__fill {
  width: 37.5%;
}

.page-about .about-team__row:nth-child(3) .about-bar__fill {
  width: 12.5%;
}

.page-about .about-team__desc {
  margin: 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

/* ---------- 不做清单 ---------- */

.page-about .about-limits {
  list-style: none;
  margin: 22px 0 26px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-limits li {
  position: relative;
  padding: 16px 20px 16px 42px;
  background: var(--deep-800);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-limits li::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 25px;
  width: 10px;
  height: 1px;
  background: var(--coral-500);
}

@media (min-width: 900px) {
  .page-about .about-limits {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 收束区 ---------- */

.page-about .about-outro {
  position: relative;
  border-radius: var(--r-panel);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--deep-800);
}

.page-about .about-outro__fig {
  margin: 0;
  position: relative;
}

.page-about .about-outro__fig::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 20, 38, .1) 0%, rgba(6, 20, 38, .92) 100%);
  pointer-events: none;
}

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

.page-about .about-outro__body {
  position: relative;
  margin-top: -72px;
  padding: 0 clamp(20px, 3vw, 40px) clamp(26px, 3.6vw, 44px);
}

.page-about .about-outro__text {
  margin: 0 0 20px;
  max-width: 32em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.5;
  color: var(--paper-50);
}

.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-links .pill {
  display: inline-block;
  padding: 9px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-cyan);
  background: rgba(0, 229, 255, .06);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--cyan-300);
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-links .pill:hover,
.page-about .about-links .pill:focus-visible {
  background: var(--cyan-500);
  border-color: var(--cyan-500);
  color: var(--deep-900);
}

/* ---------- 窄屏收束 ---------- */

@media (max-width: 620px) {
  .page-about .about-radial {
    min-width: 560px;
  }

  .page-about .about-outro__body {
    margin-top: -48px;
  }

  .page-about .about-team__row {
    padding: 18px 16px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__row:hover {
    transform: none;
  }
}