.page-about {
  --about-rail: 236px;
  --about-gap: 3.5rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-top {
  position: relative;
  padding: clamp(1.75rem, 4vw, 3.25rem) 0 clamp(1.75rem, 4vw, 3rem);
  background:
    radial-gradient(90% 130% at 94% -20%, rgba(57, 217, 199, 0.13), transparent 62%),
    linear-gradient(180deg, var(--ink-soft) 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-top .breadcrumb {
  margin-bottom: 1.4rem;
}

.page-about .about-top h1 {
  margin: 0.5rem 0 0;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-top__cols {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

.page-about .about-top__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.86);
}

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

.page-about .about-facts > div {
  padding: 0.85rem 1rem;
  background: var(--ink);
  min-width: 0;
}

.page-about .about-facts dt {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-facts dd {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-variant-numeric: tabular-nums;
  color: var(--gold-soft);
  overflow-wrap: anywhere;
}

.page-about .about-facts .about-facts__wide {
  font-size: 0.82rem;
}

@media (min-width: 860px) {
  .page-about .about-top__cols {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding-top: clamp(2.25rem, 4.5vw, 3.75rem);
  padding-bottom: clamp(2.25rem, 4.5vw, 3.75rem);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.25rem;
}

.page-about .about-body + .about-body {
  padding-top: 0;
}

.page-about .about-rail-gap {
  display: none;
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }

  .page-about .about-toc {
    position: sticky;
    top: 128px;
    align-self: start;
  }

  .page-about .about-rail-gap {
    display: block;
  }
}

/* ---------- 左侧粘性编年目录 ---------- */
.page-about .about-toc__title {
  margin: 0 0 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.1rem;
  border-left: 1px solid var(--line);
}

.page-about .about-toc__list li {
  position: relative;
}

.page-about .about-toc__list li::before {
  content: "";
  position: absolute;
  left: calc(-1.1rem - 3.5px);
  top: 0.95rem;
  width: 7px;
  height: 7px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 1.5px solid var(--line);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-toc__list li.is-active::before {
  background: var(--gold);
  border-color: var(--gold-soft);
}

.page-about .about-toc__list a {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.5rem 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: color 0.18s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--gold-soft);
}

.page-about .about-toc__list a.is-active {
  color: var(--gold-soft);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--line);
}

.page-about .about-toc__list a.is-active .about-toc__num {
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-bottom: clamp(2.25rem, 4.5vw, 3.5rem);
}

.page-about .about-sec + .about-sec {
  padding-top: clamp(2.25rem, 4.5vw, 3.5rem);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-sec__head {
  margin-bottom: 1.4rem;
}

.page-about .about-sec__head h2 {
  margin: 0.5rem 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-sec p {
  max-width: 66ch;
  margin: 0.85rem 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.82);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: 1.75rem 0 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .media-frame figcaption {
  margin-top: 0.65rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 编年轴 ---------- */
.page-about .about-chron__figure {
  margin-bottom: 0.5rem;
}

.page-about .about-timeline {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0 0 0 1.75rem;
  border-left: 1px solid var(--line);
}

.page-about .about-node {
  position: relative;
  padding-bottom: 1.85rem;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-1.75rem - 5px);
  top: 0.35rem;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--gold);
  transition: background 0.18s var(--ease);
}

.page-about .about-node:hover::before {
  background: var(--cyan);
}

.page-about .about-node__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin-bottom: 0.45rem;
}

.page-about .about-node__badge {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  padding: 0.13rem 0.42rem;
  color: var(--ink);
  background: var(--gold);
  border-radius: 2px;
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.page-about .about-node__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--gold-soft);
}

.page-about .about-node__desc {
  max-width: 62ch;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(244, 240, 230, 0.78);
}

/* ---------- 浅色编辑方针专板 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--graphite);
  border-top: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  padding: clamp(2.5rem, 5vw, 4rem) 0;
}

.page-about .about-paper .eyebrow {
  color: #87690F;
}

.page-about .about-paper__head h2 {
  margin: 0.5rem 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-paper__lead {
  max-width: 58ch;
  margin: 0.85rem 0 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: rgba(20, 26, 24, 0.72);
}

.page-about .about-rules {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  background: rgba(11, 43, 38, 0.16);
  border: 1px solid rgba(11, 43, 38, 0.16);
}

.page-about .about-rule {
  padding: 1.5rem 1.35rem;
  background: var(--paper);
  border-top: 4px solid var(--gold);
}

.page-about .about-rule:nth-child(2) {
  border-top-color: var(--zone-a);
}

.page-about .about-rule:nth-child(3) {
  border-top-color: var(--zone-b);
}

.page-about .about-rule__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: #87690F;
}

.page-about .about-rule h3 {
  margin: 0.45rem 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.06rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-rule p {
  margin: 0.6rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(20, 26, 24, 0.76);
}

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

/* ---------- 团队与分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.75rem;
  margin-top: 0.5rem;
}

.page-about .about-team__text p {
  margin-top: 0;
}

.page-about .about-team__list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.page-about .about-team__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  font-size: 0.94rem;
  color: rgba(244, 240, 230, 0.85);
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-team__list li:first-child {
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-team__list .num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-team__figure {
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 288px);
    gap: 3rem;
    align-items: start;
  }
}

/* ---------- 更正与反馈 ---------- */
.page-about .about-steps {
  list-style: none;
  display: grid;
  gap: 1rem;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-about .about-steps li {
  padding: 1.3rem 1.25rem;
  background: rgba(6, 26, 23, 0.55);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
}

.page-about .about-steps__num {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-steps h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-steps p {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(244, 240, 230, 0.76);
}

.page-about .about-steps__figure {
  margin-top: 1.75rem;
}

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

/* ---------- 备案与服务地区 ---------- */
.page-about .about-filing {
  margin: 0.25rem 0 1.25rem;
  padding: 1.15rem 1.35rem;
  border: 2px solid var(--gold);
  background: rgba(201, 162, 39, 0.07);
  box-shadow: var(--shadow-lg);
}

.page-about .about-filing__label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-filing__value {
  margin: 0.45rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  letter-spacing: 0.02em;
  color: var(--gold-soft);
  overflow-wrap: anywhere;
}

/* ---------- 继续浏览 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
  background: var(--ink-deep);
  padding: clamp(2.25rem, 4.5vw, 3.5rem) 0;
}

.page-about .about-next__list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 1.25rem 0 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-next__list a {
  display: block;
  height: 100%;
  padding: 1.15rem 1.25rem;
  background: var(--ink-deep);
  text-decoration: none;
  transition: background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  background: var(--ink-soft);
}

.page-about .about-next__title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--gold-soft);
}

.page-about .about-next__meta {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 700px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 480px) {
  .page-about .about-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-timeline {
    padding-left: 1.35rem;
  }

  .page-about .about-node::before {
    left: calc(-1.35rem - 5px);
  }

  .page-about .about-filing {
    padding: 1rem 1.1rem;
  }
}