.page-about {
  --about-rail: clamp(0px, 3vw, 56px);
  --about-radius: 6px;
  display: block;
}

/* ---------- 面包屑间距 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  align-items: end;
}

.page-about .about-hero__main {
  position: relative;
  padding-left: var(--about-rail);
}

.page-about .about-hero__main::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 4px;
  height: clamp(64px, 14vw, 132px);
  background: linear-gradient(180deg, var(--cyan), var(--purple) 62%, var(--orange));
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(30px, 6vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
  max-width: 20ch;
}

.page-about .about-hero__rule {
  display: block;
  margin: clamp(18px, 3vw, 30px) 0 0;
  height: 6px;
  width: clamp(72px, 16vw, 168px);
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 40ch;
  color: var(--mute);
  line-height: 1.85;
  font-size: clamp(15px, 1.6vw, 17px);
}

.page-about .about-hero__aside {
  align-self: stretch;
}

.page-about .about-facts {
  margin: 0;
  padding: 2px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-facts__row:last-child {
  border-bottom: 0;
}

.page-about .about-facts dt {
  color: var(--mute);
  font-size: 13px;
}

.page-about .about-facts dd {
  margin: 0;
  color: var(--cyan);
  font-size: 14px;
  letter-spacing: 0.02em;
}

/* ---------- 玻璃信息条 ---------- */
.page-about .about-glass {
  margin-top: clamp(28px, 5vw, 52px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  padding: 16px 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--about-radius);
  backdrop-filter: blur(10px);
}

.page-about .about-glass__tag {
  flex: 0 0 auto;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 2px;
}

.page-about .about-glass p {
  margin: 0;
  flex: 1 1 260px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 图注 ---------- */
.page-about .about-figure {
  margin: clamp(32px, 6vw, 64px) auto 0;
}

.page-about .about-figure img,
.page-about .about-proof__figure img,
.page-about .about-local__figure img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 基准区块 ---------- */
.page-about .about-basis {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-basis__lead {
  margin: 0 0 clamp(22px, 4vw, 34px);
  max-width: 44ch;
  color: var(--text);
  line-height: 1.85;
}

.page-about .about-mini {
  padding: clamp(18px, 2.4vw, 24px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  transition: border-color var(--t), transform var(--t);
}

.page-about .about-mini:hover,
.page-about .about-mini:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-mini .card__meta {
  margin: 0 0 10px;
}

.page-about .about-mini .card__title {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--text);
}

.page-about .about-mini p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- 栏目分工 ---------- */
.page-about .about-roles__head {
  max-width: 62ch;
}

.page-about .about-roles__list {
  margin-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .role-item {
  border-bottom: 1px solid var(--line);
  transition: background var(--t);
}

.page-about .role-item summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .role-item summary:hover {
  background: rgba(34, 224, 214, 0.05);
}

.page-about .role-item summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .role-item__idx {
  flex: 0 0 auto;
  color: var(--purple);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.page-about .role-item__name {
  flex: 1 1 auto;
  color: var(--text);
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 600;
}

.page-about .role-item__cue {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--mute);
}

.page-about .role-item[open] .role-item__cue {
  color: var(--orange);
}

.page-about .role-item[open] .role-item__idx {
  color: var(--cyan);
}

.page-about .role-item__note {
  margin: 0 0 20px;
  padding: 0 4px 0 40px;
  max-width: 46ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .about-roles__foot {
  margin: clamp(24px, 4vw, 36px) 0 0;
  max-width: 52ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.85;
}

/* ---------- 档案演进 ---------- */
.page-about .about-archive__grid {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-track {
  border-left: 1px solid var(--deep);
  padding-left: 18px;
}

.page-about .about-track__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mute);
  text-transform: uppercase;
}

.page-about .about-track__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-track__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px 8px 0;
  color: var(--mute);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t), padding-left var(--t);
}

.page-about .about-track__list a .mono {
  color: var(--purple);
  font-size: 13px;
}

.page-about .about-track__list a:hover,
.page-about .about-track__list a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
  padding-left: 6px;
}

.page-about .about-track__list a:hover .mono,
.page-about .about-track__list a:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-stages {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-stage {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--deep);
  border-radius: var(--about-radius);
  scroll-margin-top: 140px;
  transition: border-left-color var(--t), transform var(--t);
}

.page-about .about-stage:hover {
  border-left-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-stage--current {
  border-left-color: var(--orange);
}

.page-about .about-stage__badge {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-stage--current .about-stage__badge {
  color: var(--orange);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--text);
}

.page-about .about-stage p {
  margin: 0;
  max-width: 44ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.85;
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: clamp(32px, 6vw, 60px) 0 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid transparent;
  font-size: clamp(19px, 2.8vw, 30px);
  line-height: 1.5;
  font-weight: 400;
  letter-spacing: 0.005em;
  color: var(--text);
  max-width: 30ch;
  transition: border-color var(--t), padding-left var(--t), color var(--t);
}

.page-about .about-quote:hover,
.page-about .about-quote:focus-within {
  border-left-color: var(--orange);
  padding-left: 30px;
}

/* ---------- 校对流程 ---------- */
.page-about .about-proof__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-steps {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.page-about .about-steps__item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--line);
}

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

.page-about .about-steps__num {
  flex: 0 0 auto;
  color: var(--orange);
  font-size: 14px;
  letter-spacing: 0.06em;
  padding-top: 2px;
}

.page-about .about-steps__item h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--text);
}

.page-about .about-steps__item p {
  margin: 0;
  max-width: 40ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-proof__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 48ch;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .about-proof__note .mono {
  color: var(--text);
}

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

/* ---------- 本地化阅读 ---------- */
.page-about .about-local__grid {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .about-local__text p {
  margin: 0 0 18px;
  max-width: 42ch;
  color: var(--text);
  line-height: 1.85;
  font-size: 15px;
}

.page-about .about-local__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-local__list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--mute);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-local__list .mono {
  display: inline-block;
  margin-right: 10px;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.06em;
}

/* ---------- 结尾 ---------- */
.page-about .about-next .section-lead {
  max-width: 48ch;
}

.page-about .about-next .btn-row {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-basis {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-basis__head {
    padding-top: 6px;
  }

  .page-about .about-roles__list {
    margin-left: clamp(0px, 6vw, 96px);
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-track {
    position: sticky;
    top: 132px;
  }

  .page-about .about-proof__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (min-width: 1020px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
}
</main>