.page-about {
  --about-gutter: clamp(20px, 4vw, 56px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 0;
  overflow: hidden;
}
.page-about .about-hero__inner {
  padding-inline: var(--about-gutter);
  padding-bottom: 32px;
}
.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
}
.page-about .about-hero .eyebrow {
  margin-bottom: 14px;
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 6.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--warm);
  margin: 0 0 20px;
  max-width: 19ch;
}
.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.15vw, 1.075rem);
  line-height: 1.8;
  color: var(--steel);
  max-width: 62ch;
  margin: 0;
}
.page-about .about-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  border-top: 1px solid var(--line);
}
.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 6px 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__facts .mono {
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  font-weight: 700;
  color: var(--countdown);
  letter-spacing: 0.01em;
}
.page-about .about-hero__facts span:last-child {
  font-size: 0.82rem;
  color: var(--mist);
  letter-spacing: 0.06em;
}
.page-about .about-hero__media {
  position: relative;
  margin-top: 8px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--floodlight);
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10,14,20,.15) 0%, rgba(10,14,20,.7) 100%),
    linear-gradient(90deg, var(--ink) 0%, rgba(10,14,20,0) 42%);
  pointer-events: none;
}
.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.86) contrast(1.06);
}

/* ---------- 时间轴 ---------- */
.page-about .about-track .section__lead {
  max-width: 60ch;
}
.page-about .about-timeline {
  position: relative;
  margin-top: 40px;
}
.page-about .about-timeline__axis {
  display: none;
  color: var(--arc-line);
  margin-bottom: -6px;
}
.page-about .about-timeline__axis svg {
  display: block;
  width: 100%;
  height: 8px;
}
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-node {
  position: relative;
  padding-left: 26px;
  border-left: 2px solid var(--line-strong);
}
.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--arc);
  box-shadow: 0 0 0 4px rgba(31,224,216,.08);
}
.page-about .about-node__box {
  background: linear-gradient(180deg, rgba(17,24,35,.9), rgba(10,14,20,.5));
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 18px 20px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .about-node__box[open] {
  border-color: var(--arc-line);
  box-shadow: var(--shadow-glow);
}
.page-about .about-node__sum {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
}
.page-about .about-node__sum::-webkit-details-marker { display: none; }
.page-about .about-node__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--arc);
  line-height: 1;
}
.page-about .about-node__box[open] .about-node__sum::after { content: "–"; }
.page-about .about-node__era {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--arc);
  border: 1px solid var(--arc-line);
  border-radius: 999px;
  padding: 3px 10px;
}
.page-about .about-node__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.4vw, 1.28rem);
  letter-spacing: -0.01em;
  color: var(--warm);
  line-height: 1.3;
}
.page-about .about-node__body {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
}
.page-about .about-node__body p {
  margin: 0 0 10px;
  font-size: 0.955rem;
  line-height: 1.78;
  color: var(--steel);
  max-width: 68ch;
}
.page-about .about-node__note {
  color: var(--mist) !important;
  font-size: 0.86rem !important;
  letter-spacing: 0.01em;
}

/* ---------- 赛事覆盖 ---------- */
.page-about .about-map__grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}
.page-about .about-map__matrix {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: clamp(6px, 1.4vw, 14px);
  padding: 20px;
  background: var(--floodlight);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
}
.page-about .about-map__dot {
  display: block;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--arc), var(--deep-cyan));
  opacity: .82;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.page-about .about-map__matrix:hover .about-map__dot { opacity: .45; }
.page-about .about-map__matrix .about-map__dot:nth-child(3n+1):hover,
.page-about .about-map__matrix .about-map__dot:nth-child(5n+2):hover {
  opacity: 1;
  transform: scale(1.28);
}
.page-about .about-map__legend {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}
.page-about .about-legend {
  display: grid;
  grid-template-columns: 4px 1fr;
  grid-template-areas:
    "bar name"
    "bar desc";
  column-gap: 14px;
  row-gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-legend:last-child { border-bottom: 0; }
.page-about .about-legend__bar {
  grid-area: bar;
  width: 4px;
  border-radius: 4px;
  align-self: stretch;
}
.page-about .about-legend__bar--arc { background: var(--arc); }
.page-about .about-legend__bar--countdown { background: var(--countdown); }
.page-about .about-legend__bar--amber { background: var(--amber); }
.page-about .about-legend__bar--pit { background: var(--pit); }
.page-about .about-legend__bar--steel { background: var(--steel); }
.page-about .about-legend__name {
  grid-area: name;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--warm);
  letter-spacing: 0.01em;
}
.page-about .about-legend__desc {
  grid-area: desc;
  font-size: 0.845rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-topics {
  margin-top: 46px;
  padding: 26px 20px 24px;
  background: linear-gradient(180deg, rgba(12,95,92,.22), rgba(10,14,20,.2));
  border: 1px solid var(--arc-line);
  border-radius: var(--radius-l);
}
.page-about .about-topics__intro h3 {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.8vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
  margin: 0 0 10px;
}
.page-about .about-topics__intro p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--steel);
  max-width: 66ch;
}
.page-about .about-topics__table {
  margin-top: 22px;
  border-top: 1px solid var(--line-strong);
}
.page-about .about-topics__row {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 4px 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--steel);
}
.page-about .about-topics__row > span:first-child {
  color: var(--warm);
  font-weight: 600;
}
.page-about .about-topics__row--head {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .about-topics__row--head > span:first-child {
  color: var(--mist);
  font-weight: 500;
}
.page-about .about-topics__more {
  margin: 18px 0 0;
  font-size: 0.845rem;
  line-height: 1.7;
  color: var(--mist);
  max-width: 68ch;
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  border-top: 1px solid var(--line);
}
.page-about .about-source__grid {
  display: grid;
  gap: 30px;
}
.page-about .about-source__text .section__title {
  margin-top: 6px;
}
.page-about .about-source__text p {
  margin: 0 0 16px;
  font-size: 0.965rem;
  line-height: 1.82;
  color: var(--steel);
  max-width: 64ch;
}
.page-about .about-flow {
  margin-top: 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-m);
  background: rgba(17,24,35,.7);
  padding: 16px 18px;
}
.page-about .about-flow summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--warm);
}
.page-about .about-flow summary::-webkit-details-marker { display: none; }
.page-about .about-flow summary::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pit);
  flex: 0 0 auto;
  box-shadow: 0 0 0 4px rgba(255,59,78,.14);
}
.page-about .about-flow[open] summary::before { background: var(--arc); box-shadow: 0 0 0 4px rgba(31,224,216,.14); }
.page-about .about-flow__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-flow__list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px dashed var(--line);
  font-size: 0.9rem;
  line-height: 1.68;
  color: var(--steel);
}
.page-about .about-flow__n {
  color: var(--arc);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  padding-top: 2px;
}
.page-about .about-source__media {
  margin: 0;
}
.page-about .about-source__media .media__frame {
  overflow: hidden;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  aspect-ratio: 3 / 2;
  background: var(--floodlight);
}
.page-about .about-source__media .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.82) contrast(1.05);
}
.page-about .about-source__media .media__cap {
  display: block;
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: 0.01em;
}

/* ---------- 华人赛事 ---------- */
.page-about .about-hua {
  position: relative;
}
.page-about .about-hua__inner {
  padding-top: 8px;
}
.page-about .about-hua .section__title {
  max-width: 22ch;
}
.page-about .about-hua__stats {
  display: grid;
  gap: 2px;
  margin: 30px 0 34px;
  border-top: 1px solid var(--line-strong);
}
.page-about .about-hua__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-hua__num {
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  font-weight: 700;
  color: var(--countdown);
  letter-spacing: 0.01em;
  min-width: 5.4ch;
}
.page-about .about-hua__label {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--steel);
}
.page-about .about-hua__cols {
  display: grid;
  gap: 26px;
}
.page-about .about-hua__h3 {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--warm);
  margin: 0 0 10px;
  padding-left: 14px;
  border-left: 3px solid var(--arc);
}
.page-about .about-hua__cols p {
  margin: 0;
  font-size: 0.945rem;
  line-height: 1.8;
  color: var(--steel);
  max-width: 64ch;
}

/* ---------- 团队与值班 ---------- */
.page-about .about-team {
  border-top: 1px solid var(--line);
}
.page-about .about-team__grid {
  display: grid;
  gap: 28px;
}
.page-about .about-team__intro .section__title {
  margin-top: 6px;
}
.page-about .about-team__intro p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--steel);
  max-width: 56ch;
}
.page-about .about-roles {
  display: grid;
  gap: 2px;
}
.page-about .about-role {
  padding: 18px 18px 20px;
  background: rgba(17,24,35,.68);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-role:hover {
  border-color: var(--arc-line);
  transform: translateY(-2px);
}
.page-about .about-role__tag {
  display: inline-block;
  margin-bottom: 12px;
}
.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--warm);
  margin: 0 0 8px;
}
.page-about .about-role p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--steel);
}
.page-about .about-calendar {
  margin-top: 34px;
  padding: 22px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-l);
  background: linear-gradient(120deg, rgba(12,95,92,.2), rgba(10,14,20,0) 62%);
}
.page-about .about-calendar__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--warm);
  margin: 0 0 16px;
}
.page-about .about-calendar__row {
  display: grid;
  gap: 6px;
  padding: 13px 0;
  border-top: 1px dashed var(--line-strong);
}
.page-about .about-calendar__phase {
  font-size: 0.86rem;
  letter-spacing: 0.05em;
  color: var(--arc);
}
.page-about .about-calendar__desc {
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 继续往下看 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--line);
  padding-top: 0;
}
.page-about .about-next__media {
  margin: 0;
  aspect-ratio: 2 / 1;
  overflow: hidden;
  background: var(--floodlight);
}
.page-about .about-next__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.85) contrast(1.04);
}
.page-about .about-next__inner {
  padding-top: 38px;
}
.page-about .about-next__links {
  display: grid;
  gap: 2px;
  margin-top: 26px;
}
.page-about .about-next__card {
  display: grid;
  gap: 8px;
  padding: 20px 18px;
  text-decoration: none;
  background: rgba(17,24,35,.55);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-next__card:hover {
  border-color: var(--arc-line);
  background: rgba(12,95,92,.24);
  transform: translateY(-2px);
}
.page-about .about-next__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--arc);
}
.page-about .about-next__t {
  font-size: 0.945rem;
  line-height: 1.72;
  color: var(--steel);
}
.page-about .about-next__card .link-arrow {
  margin-top: 4px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 56px;
  }
  .page-about .about-hero__inner {
    padding-bottom: 40px;
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-hero__facts li {
    padding-right: 18px;
  }
  .page-about .about-hero__media {
    aspect-ratio: 21 / 9;
  }
  .page-about .about-map__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-map__matrix {
    grid-template-columns: repeat(8, minmax(0, 1fr));
    padding: 26px;
  }
  .page-about .about-topics {
    padding: 32px 30px 28px;
  }
  .page-about .about-topics__row {
    grid-template-columns: 1.2fr 1fr 1.1fr;
    font-size: 0.9rem;
  }
  .page-about .about-hua__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }
  .page-about .about-hua__stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 18px 0;
  }
  .page-about .about-hua__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }
  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-calendar__row {
    grid-template-columns: 190px 1fr;
    align-items: baseline;
    gap: 20px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-timeline__axis {
    display: block;
  }
  .page-about .about-timeline__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-about .about-node {
    padding-left: 0;
    padding-top: 30px;
    border-left: 0;
    border-top: 2px solid var(--line-strong);
    padding-right: 22px;
  }
  .page-about .about-node:last-child {
    padding-right: 0;
  }
  .page-about .about-node::before {
    left: 0;
    top: -8px;
  }
  .page-about .about-node__box {
    height: 100%;
  }
  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1fr);
    grid-template-areas:
      "intro roles"
      "calendar roles";
    column-gap: 48px;
    align-items: start;
  }
  .page-about .about-team__intro { grid-area: intro; }
  .page-about .about-roles { grid-area: roles; }
  .page-about .about-calendar { grid-area: calendar; margin-top: 30px; }
  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-next__card {
    padding: 24px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__dot,
  .page-about .about-role,
  .page-about .about-next__card,
  .page-about .about-node__box {
    transition: none;
  }
  .page-about .about-role:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}
<<<END>>>
</main>