.page-about {
  --ab-r-a: 24px 8px 24px 8px;
  --ab-r-b: 8px 24px 8px 24px;
  --ab-r-c: 24px 24px 8px 8px;
  --ab-r-d: 8px 8px 24px 24px;
  padding-bottom: 64px;
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--pulse-h) + 26px) 0 4px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -30%;
  right: -30%;
  bottom: 8%;
  height: 240px;
  background:
    radial-gradient(ellipse at 26% 50%, rgba(200, 255, 57, .12), transparent 62%),
    radial-gradient(ellipse at 76% 42%, rgba(79, 168, 255, .14), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about h1 {
  margin: 12px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(40px, 11.5vw, 86px);
  line-height: 1.02;
  letter-spacing: -.03em;
  color: #fff;
}

.page-about .about-lead {
  max-width: 44ch;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: .01em;
}

.page-about .about-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: var(--panel);
}

.page-about .about-stats__n {
  font-size: clamp(26px, 6.4vw, 34px);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stats__l {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主栏与坐标索引 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 26px;
  margin-top: 40px;
}

.page-about .about-idx {
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
}

.page-about .about-idx__ttl {
  margin: 0 0 10px;
  color: var(--mute);
}

.page-about .about-idx__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-idx__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-idx__list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--text);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .about-idx__list a:hover,
.page-about .about-idx__list a:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .about-idx__list .mono {
  font-size: 12px;
  color: var(--mute);
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) 192px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-idx {
    order: 2;
    position: sticky;
    top: calc(var(--pulse-h) + 20px);
    padding: 14px;
  }

  .page-about .about-idx__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-idx__list a {
    width: 100%;
    border-color: transparent;
    padding: 8px 8px;
  }

  .page-about .about-idx__list a:hover,
  .page-about .about-idx__list a:focus-visible {
    border-color: var(--line-strong);
    background: var(--track);
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--pulse-h) + 20px);
  padding: 6px 0 34px;
  border-top: 1px solid var(--line);
}

.page-about .about-sec + .about-sec {
  margin-top: 30px;
}

.page-about .about-sec__head h2 {
  margin: 10px 0 12px;
  font-family: var(--sans);
  font-size: clamp(24px, 5.6vw, 34px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: #fff;
}

.page-about .about-sec__head p {
  max-width: 56ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-sec__head .eyebrow .mono {
  color: var(--lime);
}

/* ---------- 岗位 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  grid-template-areas:
    "idx name count"
    "desc desc desc";
  gap: 8px 12px;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform .28s var(--ease), border-color .28s var(--ease);
}

.page-about .about-roles__row:nth-child(1) { border-radius: 22px 8px 22px 8px; }
.page-about .about-roles__row:nth-child(2) { border-radius: 8px 22px 8px 22px; }
.page-about .about-roles__row:nth-child(3) { border-radius: 22px 22px 8px 8px; }
.page-about .about-roles__row:nth-child(4) { border-radius: 8px 8px 22px 22px; }

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

.page-about .about-roles__idx {
  grid-area: idx;
  align-self: center;
  font-size: 13px;
  color: var(--mute);
}

.page-about .about-roles__name {
  grid-area: name;
  align-self: center;
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}

.page-about .about-roles__count {
  grid-area: count;
  align-self: center;
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-roles__desc {
  grid-area: desc;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 图片通用 ---------- */
.page-about .about-fig {
  margin: 22px 0 0;
}

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

/* ---------- 四步流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-flow__step {
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-flow__step--a { border-radius: 28px 8px 8px 8px; }
.page-about .about-flow__step--b { border-radius: 8px 28px 8px 8px; }
.page-about .about-flow__step--c { border-radius: 8px 8px 28px 8px; }
.page-about .about-flow__step--d { border-radius: 8px 8px 8px 28px; }

.page-about .about-flow__no {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--lime);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .06em;
}

.page-about .about-flow__step h3 {
  margin: 12px 0 8px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #fff;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-flow__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-flow__more summary {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 14px;
  color: var(--blue);
  list-style: none;
}

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

.page-about .about-flow__more summary::before {
  content: "+";
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1;
  color: var(--blue);
}

.page-about .about-flow__more[open] summary::before {
  content: "−";
}

.page-about .about-flow__more dl {
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 7px 12px;
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-flow__more dt {
  color: var(--mute);
}

.page-about .about-flow__more dd {
  margin: 0;
}

/* ---------- 专题分工 ---------- */
.page-about .about-topics {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.page-about .about-topics__cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 11px 13px;
  background: var(--track);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.page-about .about-topics__no {
  font-size: 16px;
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-topics__forms {
  display: flex;
  gap: 4px;
}

.page-about .about-topics__forms i,
.page-about .about-topics__legend i {
  display: block;
  width: 15px;
  height: 5px;
  border-radius: 2px;
}

.page-about .t-doc { background: var(--blue); }
.page-about .t-data { background: var(--lime); }
.page-about .t-hist { background: var(--orange); }

.page-about .about-topics__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--mute);
}

.page-about .about-topics__legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .about-topics__note {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 简史档案（奶油纸色） ---------- */
.page-about .about-sec--paper {
  padding: 26px 18px 30px;
  background: var(--paper);
  color: var(--paper-ink);
  border-top: 0;
  border-radius: 30px 10px 30px 10px;
}

.page-about .about-sec--paper .about-sec__head h2 {
  color: var(--paper-ink);
}

.page-about .about-sec--paper .about-sec__head p {
  color: var(--paper-ink);
  opacity: .84;
}

.page-about .about-sec--paper .eyebrow {
  color: var(--red);
}

.page-about .about-sec--paper .eyebrow .mono {
  color: var(--red);
}

@media (min-width: 720px) {
  .page-about .about-sec--paper {
    padding: 40px 36px 44px;
    border-radius: 48px 14px 48px 14px;
  }
}

.page-about .about-archive-grid {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

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

.page-about .about-arch li {
  position: relative;
  padding-left: 20px;
}

.page-about .about-arch li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--red);
  transform: rotate(45deg);
}

.page-about .about-arch__no {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper-ink);
  opacity: .6;
}

.page-about .about-arch h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper-ink);
}

.page-about .about-arch p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-ink);
  opacity: .82;
}

.page-about .about-fig--arch {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
}

.page-about .about-sec--paper .fig__cap {
  color: var(--paper-ink);
  opacity: .66;
}

.page-about .about-arch__foot {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(36, 26, 18, .22);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-ink);
  opacity: .86;
}

@media (min-width: 880px) {
  .page-about .about-archive-grid {
    grid-template-columns: minmax(0, 1fr) 290px;
    gap: 34px;
    align-items: start;
  }
}

/* ---------- 沿革阶段 ---------- */
.page-about .about-road {
  position: relative;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-road::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--blue) 56%, var(--line-strong));
  transform: rotate(2.2deg);
  transform-origin: top center;
}

.page-about .about-road li {
  position: relative;
  padding: 0 0 24px 30px;
}

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

.page-about .about-road li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--lime);
  transform: rotate(4deg);
}

.page-about .about-road li:last-child::before {
  border-color: var(--orange);
}

.page-about .about-road__v {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--blue);
}

.page-about .about-road li:last-child .about-road__v {
  border-color: rgba(255, 106, 43, .5);
  color: var(--orange);
}

.page-about .about-road h3 {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #fff;
}

.page-about .about-road p {
  max-width: 54ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-road__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-road__links a {
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 168, 255, .4);
  padding-bottom: 2px;
}

.page-about .about-road__links a:hover,
.page-about .about-road__links a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 纠错通道 ---------- */
.page-about .about-sec--fix {
  padding: 24px 18px 26px;
  background: var(--track);
  border: 1px solid var(--line-strong);
  border-top: 1px solid var(--line-strong);
  border-radius: 10px 34px 10px 34px;
}

.page-about .about-fixstats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 8px;
  margin: 22px 0 0;
}

.page-about .about-fixstats > div {
  padding: 13px 13px 15px;
  background: rgba(7, 12, 22, .58);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.page-about .about-fixstats dt {
  margin-bottom: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mute);
}

.page-about .about-fixstats dd {
  margin: 0;
  font-size: clamp(18px, 4.8vw, 24px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--lime);
}

.page-about .about-fixacts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

@media (min-width: 720px) {
  .page-about .about-sec--fix {
    padding: 36px 32px 38px;
  }
}