.page-about {
  --about-rail: 252px;
  background: var(--paper);
  color: var(--text);
}

.page-about .breadcrumbs {
  padding-block: 18px 0;
  font-size: 12.5px;
}

/* 刊头 */
.page-about .about-masthead {
  text-align: center;
  padding-block: clamp(24px, 4.5vw, 56px) clamp(18px, 3vw, 32px);
}

.page-about .about-masthead .eyebrow {
  justify-content: center;
  margin: 0;
}

.page-about .about-h1 {
  margin: 14px auto 0;
  max-width: 24ch;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 18px auto 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.9;
}

.page-about .about-meta {
  list-style: none;
  margin: clamp(22px, 4vw, 38px) auto 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 880px;
  text-align: left;
}

.page-about .about-meta li {
  background: var(--paper);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-meta .mono {
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .about-meta span:last-child {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* 首屏宽幅图 */
.page-about .about-banner {
  margin-block: clamp(16px, 3vw, 30px) 0;
}

.page-about .about-banner .media-frame {
  border: 1px solid var(--line-strong);
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-banner figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 70ch;
}

/* 主体网格 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
  padding-block: clamp(28px, 4.5vw, 60px) clamp(40px, 6vw, 80px);
}

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

.page-about .about-sec {
  padding-block: clamp(22px, 3vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .sec-index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-sec h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(22px, 2.7vw, 32px);
  line-height: 1.32;
  letter-spacing: 0.04em;
}

.page-about .about-sec p {
  margin: 14px 0 0;
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--text);
  max-width: 68ch;
}

/* 深色引文块 */
.page-about .about-quote {
  margin: clamp(20px, 3.5vw, 36px) 0;
  padding: clamp(22px, 3.4vw, 40px);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(247, 249, 248, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 249, 248, 0.05) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  border-left: 3px solid var(--orange);
  color: var(--on-ink);
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 27px);
  line-height: 1.62;
  letter-spacing: 0.03em;
  font-weight: 700;
  max-width: 26ch;
}

.page-about .about-quote cite {
  display: block;
  margin-top: 16px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--on-ink-dim);
}

/* 栏目合并示意 */
.page-about .merge-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.6vw, 26px);
  border: 1px solid var(--line-strong);
  background: var(--paper);
}

.page-about .merge-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .merge-label {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .merge-label .mono {
  color: var(--orange);
  font-weight: 700;
}

.page-about .merge-chips {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 5px;
}

.page-about .merge-chips li {
  border: 1px solid var(--line);
  background: var(--mist);
  color: var(--muted);
  font-size: 10.5px;
  line-height: 1;
  padding: 7px 0;
  text-align: center;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .merge-chips li:hover {
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .merge-chips--new {
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

.page-about .merge-chips--new li {
  border: 0;
  border-left: 3px solid var(--orange);
  background: transparent;
  text-align: left;
  padding: 8px 10px;
  font-size: 13.5px;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.page-about .merge-chips--new li:hover {
  background: var(--mist);
}

.page-about .merge-arrow {
  position: relative;
  height: 22px;
  background: linear-gradient(var(--line-strong), var(--line-strong)) center / 1px 100% no-repeat;
}

.page-about .merge-arrow::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 7px;
  height: 7px;
  margin-left: -3.5px;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  transform: rotate(45deg);
}

.page-about .merge-figure figcaption {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 图文双栏 */
.page-about .about-two {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  margin-top: 14px;
}

.page-about .about-two > div {
  min-width: 0;
}

.page-about .timing-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .timing-list li {
  background: var(--paper);
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .timing-list .mono {
  min-width: 46px;
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
}

.page-about .about-side-figure,
.page-about .about-wide-figure {
  margin: 0;
}

.page-about .about-side-figure .media-frame,
.page-about .about-wide-figure .media-frame {
  border: 1px solid var(--line-strong);
  overflow: hidden;
  background: var(--mist);
}

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

.page-about .about-side-figure figcaption,
.page-about .about-wide-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-wide-figure {
  margin-top: clamp(20px, 3vw, 32px);
}

/* 浅灰分区 */
.page-about .about-sec--mist {
  background: var(--mist);
  border-top: 0;
  padding-inline: clamp(16px, 3vw, 32px);
  margin-block: clamp(20px, 3vw, 32px);
}

.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(34, 48, 43, 0.14);
  border: 1px solid var(--line);
  margin-top: 20px;
}

.page-about .stat-row .stat {
  background: var(--paper);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .stat-row .stat-value {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .stat-row .stat-label {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* 时间线 */
.page-about .timeline {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line-strong);
}

.page-about .timeline li {
  position: relative;
  padding: 0 0 clamp(18px, 2.6vw, 26px) 16px;
}

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

.page-about .timeline li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--mid);
  transition: background var(--ease), transform var(--ease);
}

.page-about .timeline li:hover::before {
  background: var(--orange);
  transform: scale(1.25);
}

.page-about .t-year {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink);
  transition: color var(--ease);
}

.page-about .timeline li:hover .t-year {
  color: var(--orange);
}

.page-about .t-title {
  margin: 6px 0 0 !important;
  font-weight: 700;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
}

.page-about .t-desc {
  margin: 5px 0 0 !important;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 64ch;
}

/* 折叠说明 */
.page-about .note-details {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .note-details summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 14.5px;
  color: var(--ink);
  letter-spacing: 0.03em;
  transition: color var(--ease);
}

.page-about .note-details summary:hover {
  color: var(--orange);
}

.page-about .note-details p {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 66ch;
}

/* 行动区 */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* 右侧边注 */
.page-about .about-rail {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .rail-card {
  border: 1px solid var(--line-strong);
  background: var(--paper);
  padding: 18px;
}

.page-about .rail-card--dark {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--on-ink);
}

.page-about .rail-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .rail-card--dark .rail-title {
  border-bottom-color: var(--line-dark);
  color: var(--on-ink-dim);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 8px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color var(--ease), background var(--ease), color var(--ease);
}

.page-about .rail-list a:hover {
  border-left-color: var(--orange);
  background: var(--mist);
  color: var(--ink);
}

.page-about .rail-num {
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.08em;
}

.page-about .rail-list--dark a {
  color: var(--on-ink);
}

.page-about .rail-list--dark a:hover {
  background: var(--ink-800);
  color: #fff;
}

.page-about .rail-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.9;
  color: var(--on-ink-dim);
  letter-spacing: 0.04em;
}

/* 响应式 */
@media (min-width: 620px) {
  .page-about .about-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .merge-grid {
    grid-template-columns: minmax(0, 1fr) 46px minmax(0, 1.05fr);
    align-items: center;
    gap: 8px;
  }

  .page-about .merge-arrow {
    height: 60px;
    background: linear-gradient(var(--line-strong), var(--line-strong)) center / 100% 1px no-repeat;
  }

  .page-about .merge-arrow::after {
    left: auto;
    right: 0;
    bottom: 50%;
    margin: 0 -3px -3.5px 0;
    transform: rotate(-45deg);
  }

  .page-about .about-two {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

  .page-about .about-rail {
    position: sticky;
    top: 24px;
  }

  .page-about .about-article > .about-sec:nth-child(odd) p {
    max-width: 64ch;
  }
}
</main>