.page-about {
  --about-rule: rgba(217, 164, 65, 0.42);
  --about-muted: #6B5F55;
  --about-body: #3C332C;
  --about-line-dark: rgba(217, 164, 65, 0.24);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

.page-about .about-topbar {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 44px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(34px, 5.6vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 92px;
  height: 4px;
  margin-top: 20px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 52ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--about-body);
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-fact__num {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-muted);
}

.page-about .about-hero__media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--charcoal);
}

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 年表 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .year-index {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  border-top: 1px solid rgba(18, 16, 15, 0.12);
}

.page-about .year-index__item {
  border-bottom: 1px solid rgba(18, 16, 15, 0.08);
}

.page-about .year-index__link {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 12px 0;
  text-decoration: none;
  color: var(--about-body);
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.18s var(--ease);
}

.page-about .year-index__link .mono {
  font-size: 13px;
  color: var(--gold-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .year-index__link:hover,
.page-about .year-index__link:focus-visible {
  color: var(--red);
}

.page-about .about-timeline__hint {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .timeline-entry {
  position: relative;
  margin-top: 30px;
  padding-left: 26px;
  border-left: 1px solid var(--about-rule);
}

.page-about .timeline-entry::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(200, 16, 46, 0.14);
}

.page-about .timeline-entry__meta {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-deep);
}

.page-about .timeline-entry__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .timeline-entry p {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-quote {
  position: relative;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 18px 22px 18px 26px;
  border-left: 3px solid var(--red);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--paper-gold);
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.6;
  color: var(--red-deep);
}

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: 210px minmax(0, 1fr);
  }
  .page-about .about-timeline__index {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

/* ---------- 版本转折 ---------- */
.page-about .about-versions {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--ink);
  color: var(--jade-white);
  overflow: hidden;
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 164, 65, 0.22), transparent 68%);
  pointer-events: none;
}

.page-about .about-versions .section-head__title {
  color: var(--jade-white);
}

.page-about .about-versions .section-head__note {
  color: var(--silver);
}

.page-about .about-versions__tabs {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-versions .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-versions .tab {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--about-line-dark);
  background: transparent;
  color: var(--silver);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-versions .tab:hover {
  border-color: var(--gold);
  color: var(--jade-white);
}

.page-about .about-versions .tab[aria-selected="true"] {
  background: var(--red);
  border-color: var(--red);
  color: var(--jade-white);
}

.page-about .about-versions .tab:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-versions .tab-panel[hidden] {
  display: none;
}

.page-about .about-version {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  padding-top: clamp(22px, 3vw, 32px);
  margin-top: 18px;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-version__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.4;
  color: var(--gold);
}

.page-about .about-version__text p {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: #E8DFD2;
}

.page-about .about-version__data {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-line-dark);
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  align-self: start;
}

.page-about .about-version__data > div {
  padding: 14px 12px;
  background: rgba(33, 28, 26, 0.86);
}

.page-about .about-version__data dt {
  font-size: 12px;
  line-height: 1.4;
  color: var(--silver);
}

.page-about .about-version__data dd {
  margin: 8px 0 0;
  font-size: 22px;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-versions__media {
  margin: clamp(30px, 4vw, 48px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-line-dark);
  background: var(--charcoal);
}

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

.page-about .about-versions__media .media-frame__caption {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
  background: rgba(33, 28, 26, 0.9);
}

@media (min-width: 900px) {
  .page-about .about-version {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--paper-gold);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .role-matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .role-chip {
  padding: 16px 16px 18px;
  border: 1px solid rgba(18, 16, 15, 0.1);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  background: rgba(255, 249, 240, 0.72);
  transition: border-left-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .role-chip:hover {
  border-left-color: var(--red);
  transform: translateY(-2px);
}

.page-about .role-chip__num {
  display: block;
  font-size: 20px;
  line-height: 1;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .role-chip__name {
  display: block;
  margin-top: 10px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 17px;
  color: var(--ink);
}

.page-about .role-chip__desc {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .about-team__flow-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-team__flow-text {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .workflow-wrap {
  margin-top: clamp(20px, 3vw, 30px);
  overflow-x: auto;
  padding-bottom: 10px;
}

.page-about .workflow {
  display: block;
  width: 820px;
  max-width: none;
  height: auto;
}

.page-about .workflow__rule {
  stroke: var(--gold);
  stroke-width: 1;
  stroke-dasharray: 4 7;
  opacity: 0.55;
}

.page-about .workflow__node circle {
  fill: var(--paper);
  stroke: var(--red);
  stroke-width: 1.5;
  transition: fill 0.2s var(--ease);
}

.page-about .workflow__node:hover circle {
  fill: var(--red);
}

.page-about .workflow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--gold-deep);
  text-anchor: middle;
  transition: fill 0.2s var(--ease);
}

.page-about .workflow__node:hover .workflow__idx {
  fill: var(--jade-white);
}

.page-about .workflow__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 15px;
  fill: var(--ink);
  text-anchor: middle;
}

.page-about .workflow__desc {
  font-family: var(--font-sans);
  font-size: 11.5px;
  fill: var(--about-muted);
  text-anchor: middle;
}

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--paper);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-partners__media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--charcoal);
}

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

.page-about .about-partners__text p {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-partners__text .button {
  margin-top: 26px;
}

@media (min-width: 900px) {
  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  padding: clamp(48px, 8vw, 96px) 0;
  background: linear-gradient(155deg, var(--ink) 0%, var(--red-deep) 100%);
  color: var(--jade-white);
}

.page-about .about-next .section-head__title {
  color: var(--jade-white);
}

.page-about .about-next .section-head__note {
  color: var(--silver);
}

.page-about .route-list {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(217, 164, 65, 0.28);
  border: 1px solid rgba(217, 164, 65, 0.28);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .route-card {
  background: rgba(18, 16, 15, 0.62);
}

.page-about .route-card__link {
  display: block;
  padding: clamp(20px, 3vw, 28px);
  text-decoration: none;
  color: var(--jade-white);
  transition: background 0.2s var(--ease);
}

.page-about .route-card__link:hover,
.page-about .route-card__link:focus-visible {
  background: rgba(217, 164, 65, 0.16);
}

.page-about .route-card__kicker {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .route-card__title {
  display: block;
  margin-top: 10px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.4;
  color: var(--jade-white);
}

.page-about .route-card__desc {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

@media (min-width: 760px) {
  .page-about .route-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-chip,
  .page-about .route-card__link,
  .page-about .year-index__link,
  .page-about .workflow__node circle,
  .page-about .workflow__idx,
  .page-about .about-versions .tab {
    transition: none;
  }
  .page-about .role-chip:hover {
    transform: none;
  }
}
<<<END>>>