.page-about {
  --about-line: rgba(243, 233, 219, 0.14);
  --about-line-strong: rgba(243, 233, 219, 0.28);
  --about-rail: minmax(0, 3fr);
  --about-body: minmax(0, 9fr);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 30px);
}

.page-about .about-crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .about-crumb .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-crumb .breadcrumb__link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-crumb .breadcrumb__current {
  color: var(--text);
}

.page-about .about-crumb .breadcrumb__sep {
  color: var(--line);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(32px, 6vw, 68px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(24px, 4.5vw, 58px);
  border: 2px solid var(--about-line-strong);
  background:
    radial-gradient(120% 130% at 88% 0%, rgba(255, 90, 31, 0.18), transparent 58%),
    radial-gradient(90% 120% at 0% 100%, rgba(63, 169, 245, 0.1), transparent 60%),
    var(--panel);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: clamp(60px, 14vw, 160px);
  height: 6px;
  background: var(--orange);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(237, 230, 219, 0.86);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 14px 16px;
  border-left: 3px solid var(--orange);
  background: rgba(14, 17, 20, 0.55);
}

.page-about .about-stat .stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-stat .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* 章节索引 */
.page-about .about-toc {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  padding: 14px 0;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc .index-list__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 2px solid var(--line);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: border-color 0.12s ease, color 0.12s ease;
}

.page-about .about-toc .index-list__link:hover,
.page-about .about-toc .index-list__link[aria-current="true"] {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .about-toc .index-list__num {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--blue);
}

/* 章节通用 */
.page-about .about-sec {
  padding: clamp(44px, 7vw, 96px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec--brown {
  background: var(--brown);
}

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

.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 46px);
}

.page-about .about-rail {
  border-top: 3px solid var(--orange);
  padding-top: 14px;
}

.page-about .about-rail .chapter__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(44px, 6.4vw, 84px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
  transition: color 0.16s ease;
}

.page-about .about-sec.is-current .about-rail .chapter__num {
  color: var(--lime);
}

.page-about .about-rail__label {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-rail__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-sec--paper .about-rail__note,
.page-about .about-sec--paper .about-rail__label {
  color: rgba(22, 25, 28, 0.66);
}

.page-about .chapter__title {
  margin: 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--text);
}

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

.page-about .about-content__lead {
  max-width: 62ch;
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(237, 230, 219, 0.82);
}

.page-about .about-sec--paper .about-content__lead {
  color: rgba(22, 25, 28, 0.82);
}

.page-about .about-content__more {
  max-width: 62ch;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-sec--paper .about-content__more {
  color: rgba(22, 25, 28, 0.7);
}

.page-about .about-link {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 169, 245, 0.45);
}

.page-about .about-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-sec--paper .about-link {
  color: var(--orange-deep);
  border-bottom-color: rgba(185, 58, 13, 0.4);
}

/* 栏目志列表 */
.page-about .about-list {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-list__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.7;
  transition: border-color 0.12s ease;
}

.page-about .about-list__item:hover {
  border-color: var(--orange);
}

.page-about .about-list__key {
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--orange);
}

/* 图片与说明 */
.page-about .about-figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
  border: 2px solid var(--line);
}

.page-about .about-figure--square {
  margin-top: 16px;
}

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

.page-about .about-figure .media__caption,
.page-about .about-banner .media__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* 编辑部说明牌 */
.page-about .about-plates {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-plate {
  background: var(--paper);
  border: 2px solid var(--paper-ink);
  color: var(--paper-ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.page-about .about-plate:hover {
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 rgba(255, 90, 31, 0.55);
}

.page-about .about-plate__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-plate__num {
  font-family: var(--font-num);
  font-size: 28px;
  line-height: 1;
  color: var(--orange-deep);
}

.page-about .about-plate__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-plate__body {
  padding: 0 18px 18px;
}

.page-about .about-plate__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(22, 25, 28, 0.8);
}

.page-about .about-plate[open] {
  box-shadow: 6px 6px 0 rgba(217, 255, 61, 0.6);
}

/* 四步流程 */
.page-about .about-steps {
  display: grid;
  gap: 16px;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  position: relative;
  padding: 18px 20px;
  border: 2px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.12s ease, transform 0.12s ease;
}

.page-about .about-step:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .about-step__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--blue);
}

.page-about .about-step__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-step__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 230, 219, 0.78);
}

.page-about .about-step__out {
  margin: 12px 0 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 0.12s ease;
}

.page-about .about-step:hover .about-step__out {
  color: var(--lime);
}

/* 四级目录 */
.page-about .about-ladder {
  display: grid;
  gap: 10px;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-ladder__row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
  padding: 14px 16px;
  border-left: 6px solid var(--orange);
  background: rgba(14, 17, 20, 0.5);
}

.page-about .about-ladder__step {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-ladder__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-ladder__desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 栏目演进 */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 26px;
  margin: clamp(20px, 2.6vw, 32px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 2px solid var(--line);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 10px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: background 0.16s ease, border-color 0.16s ease;
}

.page-about .about-timeline__item.is-current::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--orange);
  transition: color 0.16s ease;
}

.page-about .about-timeline__item.is-current .about-timeline__year {
  color: var(--lime);
}

.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-timeline__text {
  max-width: 56ch;
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(237, 230, 219, 0.78);
}

/* 合作与专题 */
.page-about .about-banner {
  margin: 0 0 clamp(26px, 3.6vw, 46px);
  border: 2px solid var(--about-line-strong);
}

.page-about .about-cols--partners {
  align-items: start;
}

.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.4vw, 28px);
}

.page-about .about-partner {
  padding: 18px 20px;
  border: 2px solid var(--line);
  background: rgba(14, 17, 20, 0.45);
  transition: border-color 0.12s ease, transform 0.12s ease;
}

.page-about .about-partner:hover {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .about-partner .card__top {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-partner__num {
  margin: 10px 0 0;
  font-family: var(--font-num);
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-partner .card__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(237, 230, 219, 0.78);
}

/* 联系 */
.page-about .about-contact-box {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 18px 20px;
  border: 2px solid var(--paper-ink);
  background: rgba(255, 255, 255, 0.4);
}

.page-about .about-contact-box__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange-deep);
}

.page-about .about-copy {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 12px 16px;
  border: 2px solid var(--paper-ink);
  background: transparent;
  color: var(--paper-ink);
  font: inherit;
  cursor: pointer;
  transition: border-color 0.12s ease, color 0.12s ease, background 0.12s ease;
}

.page-about .about-copy:hover {
  border-color: var(--orange-deep);
  color: var(--orange-deep);
}

.page-about .about-copy[data-state="copied"] {
  border-color: var(--green);
  color: var(--green);
}

.page-about .about-copy .copy-btn__value {
  font-family: var(--font-num);
  font-size: 15px;
  word-break: break-all;
}

.page-about .about-copy .copy-btn__hint {
  font-size: 12px;
  color: rgba(22, 25, 28, 0.6);
}

.page-about .about-contact-box__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(22, 25, 28, 0.78);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

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

.has-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

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

/* 响应式 */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-toc__list {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-about .about-plates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-ladder__row {
    grid-template-columns: 56px 130px minmax(0, 1fr);
  }

  .page-about .about-ladder__desc {
    grid-column: 3;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 980px) {
  .page-about .about-cols {
    grid-template-columns: var(--about-rail) var(--about-body);
    gap: clamp(30px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-hero__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }

  .has-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>