.page-about {
  --about-rail-w: 184px;
  --about-gap: clamp(20px, 3vw, 44px);
  --about-pad: clamp(16px, 2.6vw, 26px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

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

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 26px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: clamp(14px, 2.4vw, 26px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--c-line);
  padding: clamp(22px, 4vw, 54px);
  background:
    repeating-linear-gradient(90deg, rgba(30, 74, 79, 0.16) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(0deg, rgba(30, 74, 79, 0.16) 0 1px, transparent 1px 8px),
    linear-gradient(152deg, rgba(11, 30, 51, 0.95) 0%, rgba(6, 18, 15, 0.92) 56%, rgba(16, 43, 51, 0.8) 100%);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 56px;
  height: 56px;
  border: 1px solid var(--c-accent);
  opacity: 0.36;
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 5.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(14px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--c-muted);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3.2vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  background: rgba(11, 30, 51, 0.78);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-amber);
}

.page-about .about-hero__key {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体与档案索引 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(30px, 5vw, 62px);
}

.page-about .about-rail {
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  padding: 12px 0;
}

.page-about .about-rail__cap {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

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

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

.page-about .about-rail__item {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--c-line);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--c-muted);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.72;
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-visible {
  color: var(--c-accent);
  border-color: var(--c-accent);
  background: rgba(55, 240, 208, 0.07);
  outline: none;
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    border-top: 0;
    border-bottom: 0;
    padding: 0;
  }

  .page-about .about-rail__list {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    overflow: visible;
  }

  .page-about .about-rail__item {
    display: flex;
    border: 0;
    border-left: 1px solid var(--c-line);
    padding: 11px 8px 11px 20px;
    white-space: normal;
    font-size: 13px;
  }

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    margin-top: -2.5px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--c-line);
    transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
  }

  .page-about .about-rail__item:hover,
  .page-about .about-rail__item:focus-visible {
    border-color: var(--c-accent);
    background: rgba(55, 240, 208, 0.06);
  }

  .page-about .about-rail__item:hover::before,
  .page-about .about-rail__item:focus-visible::before {
    background: var(--c-accent);
    box-shadow: 0 0 0 3px rgba(55, 240, 208, 0.18);
  }
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-top: clamp(38px, 6vw, 68px);
  scroll-margin-top: 96px;
}

.page-about .about-main > .about-section:first-child {
  padding-top: 0;
}

.page-about .about-head {
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .about-head .eyebrow {
  margin: 0 0 8px;
}

.page-about .about-head__text {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-muted);
}

.page-about .about-fig {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  background: var(--c-panel-2);
}

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

.page-about .about-fig .media-frame__caption {
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--c-muted);
  border-top: 1px solid var(--c-line);
  background: rgba(6, 18, 15, 0.6);
}

/* ---------- 团队矩阵 ---------- */
.page-about .about-team__fig {
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .about-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 16px;
  border: 1px solid var(--c-line);
  background: linear-gradient(180deg, rgba(16, 43, 51, 0.92), rgba(11, 30, 51, 0.72));
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--c-accent);
  outline: none;
  box-shadow: 0 0 0 2px rgba(55, 240, 208, 0.35);
}

.page-about .about-team__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--c-accent);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-amber);
}

.page-about .about-team__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-text);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--c-muted);
}

.page-about .about-team__kw {
  min-height: 18px;
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--c-accent);
  opacity: 1;
  transform: none;
  transition: opacity 180ms var(--ease), transform 180ms var(--ease);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-team__kw {
    opacity: 0;
    transform: translateY(-4px);
  }

  .page-about .about-team__card:hover .about-team__kw,
  .page-about .about-team__card:focus-within .about-team__kw,
  .page-about .about-team__card:focus-visible .about-team__kw {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1140px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 流程推进带 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-line);
  background: rgba(11, 30, 51, 0.55);
}

.page-about .about-flow__item:nth-child(1) .about-step {
  border-left-color: rgba(55, 240, 208, 0.28);
}

.page-about .about-flow__item:nth-child(2) .about-step {
  border-left-color: rgba(55, 240, 208, 0.5);
}

.page-about .about-flow__item:nth-child(3) .about-step {
  border-left-color: rgba(55, 240, 208, 0.72);
}

.page-about .about-flow__item:nth-child(4) .about-step {
  border-left-color: rgba(55, 240, 208, 0.95);
}

.page-about .about-step[open] {
  background: rgba(16, 43, 51, 0.86);
}

.page-about .about-step__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--c-text);
}

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

.page-about .about-step__head:hover,
.page-about .about-step__head:focus-visible {
  outline: none;
  background: rgba(55, 240, 208, 0.06);
}

.page-about .about-step__head:focus-visible {
  box-shadow: inset 0 0 0 2px var(--c-accent);
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

.page-about .about-step__title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-step__tag {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.page-about .about-step__body {
  padding: 0 16px 16px;
}

.page-about .about-step__list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--c-muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 24px 22px;
  border-left: 1px solid var(--c-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(55, 240, 208, 0.12);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-amber);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-text);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

@media (min-width: 900px) {
  .page-about .about-timeline__wrap {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
  }

  .page-about .about-timeline__fig {
    position: sticky;
    top: 104px;
  }
}

/* ---------- 校对与更正 ---------- */
.page-about .about-proofline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 28px);
}

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

.page-about .about-proofline__list li {
  padding: 14px 16px 14px 20px;
  border-left: 3px solid var(--c-accent);
  border-top: 1px solid var(--c-line);
  border-right: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background: rgba(11, 30, 51, 0.62);
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-muted);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-about .about-proofline__list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
}

@media (min-width: 900px) {
  .page-about .about-proofline {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: start;
  }
}

/* ---------- 读者与合作 ---------- */
.page-about .about-readers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-readers__stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 20px 18px;
  border: 1px solid var(--c-line);
  background: linear-gradient(135deg, rgba(55, 240, 208, 0.14), rgba(11, 30, 51, 0.88) 58%);
}

.page-about .about-readers__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-accent);
}

.page-about .about-readers__unit {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--c-text);
}

.page-about .about-readers__stat p {
  flex: 1 1 100%;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-readers__block {
  padding: 18px;
  border: 1px solid var(--c-line);
  background: rgba(11, 30, 51, 0.62);
}

.page-about .about-readers__block h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-text);
}

.page-about .about-readers__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-readers__list li {
  padding-left: 12px;
  border-left: 2px solid rgba(55, 240, 208, 0.32);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-readers__list strong {
  display: block;
  margin-bottom: 2px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-text);
}

.page-about .about-readers__text {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.82;
  color: var(--c-muted);
}

.page-about .about-readers__btn {
  display: inline-block;
}

@media (min-width: 860px) {
  .page-about .about-readers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-readers__stat {
    grid-column: 1 / -1;
  }
}

/* ---------- 地址与联系 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-reach__card {
  padding: 16px 18px;
  border: 1px solid var(--c-line);
  background: rgba(16, 43, 51, 0.66);
}

.page-about .about-reach__key {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .about-reach__val {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.8vw, 17px);
  line-height: 1.6;
  word-break: break-word;
  color: var(--c-text);
}

.page-about .about-reach__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-reach__more {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-muted);
}

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

  .page-about .about-reach__card--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- 行内链接 ---------- */
.page-about .about-inline-link {
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 240, 208, 0.4);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-accent-strong);
  border-bottom-color: var(--c-accent-strong);
  outline: none;
}

.page-about .about-inline-link:focus-visible {
  box-shadow: 0 0 0 2px var(--c-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__item,
  .page-about .about-team__card,
  .page-about .about-team__kw,
  .page-about .about-inline-link {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-visible {
    transform: none;
  }
}