.page-about {
  --about-rail: 200px;
  padding-bottom: 72px;
}

.page-about .breadcrumb {
  margin-top: 22px;
}

/* ---------- 首屏：杂志封面式三栏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  margin-top: 18px;
}

.page-about .about-hero__index-title {
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__index ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.page-about .about-hero__index a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-hero__index a:hover,
.page-about .about-hero__index a[data-current="true"] {
  color: var(--neon);
  border-bottom-color: rgba(95, 243, 217, 0.5);
}

.page-about .about-hero__lead .display {
  margin: 8px 0 16px;
  font-size: clamp(2.15rem, 8.4vw, 4.4rem);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead .lead {
  max-width: 52ch;
  color: var(--text);
  opacity: 0.86;
  margin: 0;
}

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

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 14px;
  background: var(--layer);
}

.page-about .about-fact__num {
  font-size: 20px;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-fact__cap {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 148px minmax(0, 1fr) 268px;
    column-gap: 42px;
    align-items: start;
    margin-top: 44px;
  }

  .page-about .about-hero__index ul {
    display: block;
  }

  .page-about .about-hero__index li {
    margin-bottom: 11px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  margin-top: 62px;
  scroll-margin-top: 82px;
}

.page-about .about-section__head {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin-bottom: 26px;
}

.page-about .about-section__title {
  margin: 8px 0 8px;
  font-size: clamp(1.45rem, 4.6vw, 2.25rem);
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1.18;
}

.page-about .about-section__note {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
}

@media (min-width: 900px) {
  .page-about .about-section {
    margin-top: 96px;
    scroll-margin-top: 40px;
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 28px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--layer);
  box-shadow: var(--shadow-soft);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 14px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, rgba(95, 243, 217, 0.6), rgba(42, 110, 102, 0.3));
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: 32px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--neon);
  box-shadow: 0 0 0 3px rgba(95, 243, 217, 0.08);
}

.page-about .about-tl__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

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

.page-about .about-tl__ver {
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.page-about .about-tl__body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.page-about .about-tl__body p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-tl__item--figure {
  padding-bottom: 34px;
}

.page-about .about-figure--tall {
  margin: 0;
}

.page-about .about-figure--tall img {
  max-width: 360px;
}

@media (min-width: 900px) {
  .page-about .about-tl::before {
    left: calc(var(--about-rail) - 1px);
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 42px;
    padding-left: 0;
    padding-bottom: 40px;
  }

  .page-about .about-tl__item::before {
    left: calc(var(--about-rail) - 6px);
    top: 8px;
  }

  .page-about .about-tl__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    margin-bottom: 0;
    padding-right: 20px;
  }

  .page-about .about-tl__body h3 {
    margin-top: -4px;
  }
}

/* ---------- 数字带 ---------- */
.page-about .about-band {
  margin-top: 72px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 59, 54, 0.72), rgba(11, 31, 28, 0.92));
}

.page-about .about-band__list {
  list-style: none;
  margin: 0;
  padding: 26px 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
}

.page-about .about-band__cell > summary {
  display: block;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.3rem, 7.6vw, 4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
  text-shadow: 0 0 26px rgba(95, 243, 217, 0.22);
}

.page-about .about-band__cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-band__cell > summary::after {
  content: "展开 +";
  display: block;
  margin-top: 10px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--line);
  transition: color 180ms var(--ease);
}

.page-about .about-band__cell[open] > summary::after {
  content: "收起 –";
  color: var(--line);
}

.page-about .about-band__cell > summary:hover::after {
  color: var(--muted);
}

.page-about .about-band__more {
  margin: 12px 0 0;
  max-width: 40ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  border-left: 1px solid var(--line);
  padding-left: 12px;
}

@media (min-width: 760px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 34px 0;
  }
}

/* ---------- 团队分工折叠 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
}

.page-about .about-team .fold {
  background: var(--layer);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 200ms var(--ease);
}

.page-about .about-team .fold:hover {
  border-color: rgba(95, 243, 217, 0.42);
}

.page-about .fold__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
}

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

.page-about .fold__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--neon);
  transform-origin: center;
  transition: transform 200ms var(--ease);
}

.page-about .fold[open] .fold__head::after {
  content: "+";
  transform: rotate(45deg);
}

.page-about .about-team__role {
  letter-spacing: 0.02em;
}

.page-about .about-team__num {
  margin-left: 4px;
  font-size: 12.5px;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .fold__body {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .fold__body p {
  margin: 0;
  max-width: 56ch;
}

@media (min-width: 780px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 26px;
}

.page-about .about-rhythm__list {
  display: grid;
  gap: 18px;
}

.page-about .about-rhythm__item {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-rhythm__when {
  display: inline-block;
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.page-about .about-rhythm__item h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 400;
}

.page-about .about-rhythm__item p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

@media (min-width: 900px) {
  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    column-gap: 44px;
    align-items: start;
  }

  .page-about .about-rhythm .about-figure {
    margin-bottom: 0;
  }
}

/* ---------- 内容伙伴 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-partners li {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-partners h3 {
  margin: 12px 0 8px;
  font-size: 16.5px;
  font-weight: 400;
}

.page-about .about-partners p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

/* ---------- 自查与规范 ---------- */
.page-about .about-audit {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(29, 87, 80, 0.5), rgba(11, 22, 38, 0.66));
  padding: 24px 20px;
  display: grid;
  gap: 22px;
}

.page-about .about-audit__main p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.86;
}

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

.page-about .about-audit__main a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(95, 243, 217, 0.42);
  transition: border-color 160ms var(--ease);
}

.page-about .about-audit__main a:hover {
  border-bottom-color: var(--neon);
}

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

.page-about .about-audit__points li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-audit__points .mono {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.06em;
}

@media (min-width: 900px) {
  .page-about .about-audit {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 44px;
    padding: 32px 30px;
    align-items: start;
  }
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: 70px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.page-about .about-next h2 {
  margin: 0 0 20px;
  font-size: clamp(1.25rem, 3.6vw, 1.7rem);
  font-weight: 300;
  letter-spacing: -0.01em;
}

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

.page-about .about-next__links li {
  display: grid;
  gap: 6px;
  border-left: 1px solid var(--line);
  padding: 2px 0 2px 14px;
}

.page-about .about-next__links a {
  font-size: 15.5px;
  color: var(--neon);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 160ms var(--ease);
}

.page-about .about-next__links a:hover {
  color: var(--gold);
}

.page-about .about-next__links span {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 780px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}