.page-about {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-crumbs {
  margin-bottom: clamp(22px, 4vw, 38px);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 24px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(115% 82% at 86% -8%, rgba(57, 230, 195, 0.18), transparent 58%),
    linear-gradient(168deg, var(--ink) 0%, var(--pit) 60%, var(--black) 100%);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--line) 0 14px, transparent 14px 30px);
  opacity: 0.9;
}

.page-about .about-cover__grid {
  display: grid;
  gap: clamp(28px, 5vw, 46px);
  align-items: end;
}

.page-about .about-cover__num {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-cover__num::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-cover__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.5rem, 9.5vw, 5.1rem);
  line-height: 1.03;
  letter-spacing: -0.015em;
}

.page-about .about-cover__hl {
  display: inline-block;
  padding-bottom: 4px;
  border-bottom: 4px solid var(--cyan);
}

.page-about .about-cover__lede {
  margin: 22px 0 0;
  max-width: 36em;
  font-size: var(--step-1);
  line-height: 1.8;
  color: rgba(247, 242, 231, 0.86);
}

.page-about .about-cover__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

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

.page-about .about-cover__figure {
  margin: 0;
  clip-path: var(--cut);
  border: 1px solid var(--line);
}

.page-about .about-cover__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.95) contrast(1.06);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: grid;
  gap: 1px;
  margin-top: clamp(34px, 6vw, 58px);
  border-top: 1px solid var(--line);
}

.page-about .about-index__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
  text-decoration: none;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(15, 43, 35, 0.55), rgba(8, 26, 21, 0.18));
  border-bottom: 1px solid var(--line);
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-index__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.35s var(--ease);
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  background: var(--pit);
  outline: none;
}

.page-about .about-index__item:hover::after,
.page-about .about-index__item:focus-visible::after {
  transform: scaleY(1);
}

.page-about .about-index__num {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-index__label {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(56px, 9vw, 108px) 0;
}

.page-about .about-chapter--pit {
  background: linear-gradient(180deg, var(--black) 0%, var(--ink) 46%, var(--pit) 100%);
}

.page-about .about-chapter--ink {
  background: linear-gradient(180deg, var(--ink), var(--black));
}

.page-about .about-chapter--paper {
  background: var(--paper-warm);
  color: var(--ink);
}

.page-about .about-head {
  max-width: 60ch;
  margin-bottom: clamp(30px, 5vw, 52px);
}

.page-about .about-head__num {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .about-head__title {
  margin: 10px 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .about-head__lede {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-chapter--paper .about-head__num {
  color: var(--pit);
}

.page-about .about-chapter--paper .about-head__num::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 10px;
  background: var(--orange);
}

.page-about .about-chapter--paper .about-head__lede {
  color: rgba(4, 16, 12, 0.72);
}

/* ---------- 编辑台 ---------- */
.page-about .about-editorial {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .about-flow__item {
  position: relative;
  padding: 22px 0 24px 54px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow__num {
  position: absolute;
  left: 0;
  top: 25px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-flow__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.04rem;
  color: var(--paper);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-editorial__figure {
  margin: 0;
  clip-path: var(--cut);
  border: 1px solid var(--line);
}

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

.page-about .about-note {
  border: 1px solid var(--line);
  background: var(--pit);
  clip-path: var(--cut);
}

.page-about .about-note .cut-panel__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 6px 26px;
  display: grid;
  gap: clamp(26px, 4vw, 42px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--pit), rgba(46, 74, 65, 0.35));
  transform: skewX(-6deg);
  transform-origin: top;
}

.page-about .about-tl {
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 12px;
  width: 17px;
  height: 3px;
  background: var(--orange);
  transform: rotate(-22deg);
}

.page-about .about-tl__body {
  padding: 20px 20px 22px;
  background: rgba(247, 242, 231, 0.78);
  border: 1px solid rgba(46, 74, 65, 0.28);
  clip-path: var(--cut);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-tl:hover .about-tl__body {
  border-color: var(--pit);
  background: var(--paper);
}

.page-about .about-tl__era {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--pit);
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.12rem, 2.6vw, 1.32rem);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(4, 16, 12, 0.74);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-team__figure {
  margin: 0;
  padding: 16px;
  background: rgba(15, 43, 35, 0.55);
  border: 1px solid var(--line);
  clip-path: var(--cut);
}

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

.page-about .about-net__cap {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-roles {
  display: block;
}

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

.page-about .about-role:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-about .about-role summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--paper);
  transition: color 0.25s var(--ease);
}

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

.page-about .about-role summary:hover,
.page-about .about-role summary:focus-visible {
  color: var(--cyan);
  outline: none;
}

.page-about .about-role__name {
  flex: 1 1 auto;
}

.page-about .about-role__count {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-role summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-role[open] summary::after {
  content: "–";
}

.page-about .about-role p {
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-roles__foot {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-roles__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 195, 0.45);
}

.page-about .about-roles__foot a:hover {
  border-color: var(--cyan);
}

/* ---------- 服务与联系 ---------- */
.page-about .about-contact {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-contact__subtitle {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--ink);
}

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

.page-about .about-contact__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(4, 16, 12, 0.76);
}

.page-about .about-contact__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 3px;
  background: var(--orange);
  transform: rotate(-24deg);
}

.page-about .about-contact__hint {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--pit);
}

.page-about .about-contact__panel {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--line);
  clip-path: var(--cut);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.6;
}

.page-about .about-contact__row a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 195, 0.4);
  word-break: break-all;
}

.page-about .about-contact__row a:hover {
  border-color: var(--cyan);
}

.page-about .about-contact__key {
  flex: 0 0 auto;
  min-width: 44px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
  padding-top: 3px;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 悬停与显现 ---------- */
.page-about .about-chapter [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-chapter [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  }

  .page-about .about-chapter [data-reveal].is-in {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-index__item,
.page-about .about-tl__body,
.page-about .about-role summary {
  will-change: auto;
}

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

@media (min-width: 900px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: clamp(36px, 5vw, 64px);
  }

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

  .page-about .about-editorial {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-timeline {
    padding-left: 44px;
    max-width: 900px;
  }

  .page-about .about-tl::before {
    left: -40px;
    width: 24px;
  }

  .page-about .about-tl__body {
    padding: 24px 26px 26px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-timeline {
    padding-left: 60px;
  }

  .page-about .about-tl::before {
    left: -54px;
    width: 34px;
  }
}
<<<END>>>