.page-about {
  --about-rail: 76px;
  --about-deep-gold: #6B5310;
  --about-ink-soft: rgba(244, 241, 232, 0.82);
  background: var(--ink-800);
  color: var(--bone);
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--bone);
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
  color: var(--bone);
}

.page-about p {
  line-height: 1.75;
  margin: 0 0 12px;
}

.page-about .section {
  padding: clamp(44px, 8vw, 88px) 0;
  border-top: 1px solid var(--line-hard);
  position: relative;
}

.page-about .breadcrumbs {
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--gold-soft);
}

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

.page-about .breadcrumbs__item span {
  color: var(--gold-soft);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 clamp(36px, 6vw, 72px);
  background:
    linear-gradient(165deg, var(--ink-900) 0%, var(--ink-800) 55%, var(--ink-700) 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 162, 39, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 162, 39, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(120% 90% at 80% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 90% at 80% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 7.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 10px 0 16px;
  color: var(--bone);
  max-width: 20ch;
}

.page-about .about-hero .lede {
  font-size: clamp(15px, 2.4vw, 18px);
  line-height: 1.8;
  color: var(--about-ink-soft);
  max-width: 44ch;
}

.page-about .about-hero__note {
  color: var(--mist);
  font-size: 13.5px;
  margin-top: 14px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__board {
  position: relative;
  border: 1px solid var(--line);
  background: rgba(7, 21, 18, 0.55);
  padding: 20px 18px;
}

.page-about .about-hero__board::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-board__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-soft);
  margin: 0 0 16px;
}

.page-about .about-board__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .about-board__list li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  border-left: 1px solid var(--line);
  padding-left: 10px;
}

.page-about .about-board__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 28px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .about-board__key {
  font-size: 12px;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-board__foot {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-hard);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* 章节编号 */
.page-about .about-sec-num {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-sec-num::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--gold);
}

/* 起点 */
.page-about .about-origin {
  background: var(--ink-800);
}

.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__body p {
  color: var(--about-ink-soft);
  font-size: 15px;
}

.page-about .about-checklist {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-checklist li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--bone);
}

.page-about .about-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 1px;
  background: var(--gold);
}

/* 图片基础 */
.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-950);
}

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

.page-about .figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 21, 18, 0.04) 0%, rgba(7, 21, 18, 0.42) 100%);
  pointer-events: none;
}

.page-about .figure__cap {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 1px solid var(--gold);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* 年份走廊 */
.page-about .about-road {
  background: var(--ink-900);
}

.page-about .about-road__head {
  max-width: 62ch;
  margin-bottom: 26px;
}

.page-about .about-road__intro {
  color: var(--mist);
  font-size: 14.5px;
}

.page-about .about-road__figure {
  margin: 0 0 34px;
}

.page-about .about-road__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .road-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  padding-bottom: 34px;
}

.page-about .road-item::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: -10px;
  left: calc(var(--about-rail) - 0.5px);
  width: 1px;
  background: linear-gradient(180deg, var(--line) 0%, rgba(201, 162, 39, 0.08) 100%);
}

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

.page-about .road-item:last-child::before {
  display: none;
}

.page-about .road-item__mark {
  position: relative;
  text-align: right;
  padding: 2px 18px 0 0;
}

.page-about .road-item__mark::after {
  content: "";
  position: absolute;
  right: -4px;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--gold);
}

.page-about .road-item__year {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.1;
  color: var(--gold-soft);
}

.page-about .road-item__sub {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .road-item__body {
  padding-left: 20px;
}

.page-about .road-item__body p {
  font-size: 14px;
  color: var(--about-ink-soft);
  margin-bottom: 10px;
}

.page-about .road-item--now .road-item__year {
  color: var(--gold);
  font-size: 26px;
}

.page-about .road-item--now .road-item__mark::after {
  width: 10px;
  height: 10px;
  right: -5px;
  top: 13px;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.18);
}

.page-about .about-fold {
  margin-top: 10px;
  border-top: 1px solid var(--line-hard);
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}

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

.page-about .about-fold summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
  color: var(--gold);
}

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

.page-about .about-fold p {
  margin: 0 0 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* 团队 */
.page-about .about-team {
  background: var(--ink-800);
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__body p {
  color: var(--about-ink-soft);
  font-size: 15px;
}

.page-about .about-counts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.page-about .about-count {
  border-top: 1px solid var(--gold);
  padding-top: 12px;
}

.page-about .about-count__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .about-count__label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* 方法 */
.page-about .about-method {
  background: var(--ink-900);
}

.page-about .about-method__head {
  max-width: 66ch;
}

.page-about .about-method__intro {
  color: var(--mist);
  font-size: 14.5px;
}

.page-about .about-method__panel {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-method__col {
  background: var(--ink-800);
  padding: 22px 20px;
}

.page-about .about-method__lead {
  font-size: 13.5px;
  color: var(--mist);
  margin-bottom: 0;
}

.page-about .about-fields {
  list-style: none;
  margin: 16px 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-fields li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--about-ink-soft);
}

.page-about .about-fields li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-method__time {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-hard);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
}

.page-about .about-copybar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(7, 21, 18, 0.5);
}

.page-about .about-copybar__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-copybar__val {
  margin: 5px 0 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
}

.page-about .copy-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .copy-btn:hover {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .copy-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* 合作 */
.page-about .about-partners {
  background: var(--bone);
  color: var(--ink-900);
}

.page-about .about-partners h2 {
  color: var(--ink-900);
}

.page-about .about-partners .about-sec-num {
  color: var(--about-deep-gold);
}

.page-about .about-partners .about-sec-num::before {
  background: var(--about-deep-gold);
}

.page-about .about-partners__intro {
  max-width: 62ch;
  font-size: 14.5px;
  color: #3A4A45;
}

.page-about .about-partner-grid {
  display: grid;
  gap: 1px;
  margin: 26px 0;
  border: 1px solid rgba(14, 42, 36, 0.16);
  background: rgba(14, 42, 36, 0.16);
}

.page-about .about-partner {
  background: var(--bone);
  padding: 20px 18px;
}

.page-about .about-partner__title {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
  color: var(--ink-900);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: #3A4A45;
}

.page-about .about-honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 26px;
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--about-deep-gold);
}

.page-about .about-honor__year {
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1.1;
  color: var(--about-deep-gold);
}

.page-about .about-honor__text {
  margin: 0;
  max-width: 48ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: #3A4A45;
}

/* 天津与联系 */
.page-about .about-tianjin {
  background: var(--ink-800);
}

.page-about .about-tianjin__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-tianjin__grid > div > p {
  color: var(--about-ink-soft);
  font-size: 15px;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 22px;
}

.page-about .about-link {
  font-size: 14px;
  color: var(--gold-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

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

.page-about .about-contact {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-700) 0%, var(--ink-900) 100%);
  padding: 20px 18px;
}

.page-about .about-contact__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--gold-soft);
}

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

.page-about .about-contact__row {
  display: grid;
  gap: 4px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-hard);
}

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

.page-about .about-contact__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-contact__val {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bone);
  overflow-wrap: anywhere;
}

.page-about .about-contact__val--row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-contact__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-hard);
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* 响应式 */
@media (min-width: 600px) {
  .page-about .about-counts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about {
    --about-rail: 150px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .about-tianjin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .road-item__year {
    font-size: 34px;
  }

  .page-about .road-item__mark {
    padding-top: 0;
  }

  .page-about .road-item__mark::after {
    top: 14px;
  }

  .page-about .road-item--now .road-item__year {
    font-size: 38px;
  }

  .page-about .road-item__body {
    padding-left: 30px;
  }

  .page-about .road-item__body p {
    font-size: 15px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-method__col {
    padding: 26px 26px;
  }

  .page-about .about-contact {
    padding: 24px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .copy-btn {
    transition: none;
  }
}
<<<END>>>