.page-about {
  --about-rail-w: 120px;
  --about-hair: rgba(244, 239, 231, 0.14);
  --about-hair-ink: rgba(18, 16, 15, 0.16);
  --about-dim-ink: rgba(18, 16, 15, 0.62);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .wrap {
  max-width: 1180px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(46px, 8vw, 104px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  align-items: end;
  margin-top: clamp(26px, 5vw, 58px);
}

.page-about .about-hero__text .eyebrow {
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--ember);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(40px, 8.4vw, 104px);
  line-height: 0.96;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  max-width: 33em;
  margin: clamp(18px, 3vw, 30px) 0 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--ash);
}

.page-about .about-hero__figure {
  border-top: 2px solid var(--lava);
  padding-top: clamp(12px, 2vw, 18px);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(64px, 13vw, 128px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__cap {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ash);
  max-width: 22em;
}

/* ---------- 通用分栏 ---------- */
.page-about .about-row {
  display: grid;
  gap: clamp(16px, 3vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--dim);
  text-transform: uppercase;
}

.page-about .about-rail__num {
  color: var(--lava);
  font-weight: 700;
}

.page-about .about-row__body h2 {
  margin: 0 0 0.65em;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.015em;
}

.page-about .prose p,
.page-about .about-row__body > p,
.page-about .about-step__body p,
.page-about .about-evo__body p,
.page-about .about-team__notes p,
.page-about .about-rhythm__col p,
.page-about .about-cta p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ash);
}

.page-about .about-row__body h3 {
  margin: 0 0 0.4em;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-row__body a {
  color: var(--sky);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-row__body a:hover {
  color: var(--ember);
}

/* ---------- 出发点 ---------- */
.page-about .about-creed__prose {
  max-width: 34em;
}

.page-about .about-creed__prose p:last-child {
  color: var(--paper);
  font-weight: 700;
  padding-left: 14px;
  border-left: 2px solid var(--lava);
}

/* ---------- 团队 ---------- */
.page-about .about-team__lead {
  max-width: 36em;
}

.page-about .about-team__bar {
  display: flex;
  gap: 3px;
  height: clamp(58px, 9vw, 82px);
  margin: clamp(24px, 4vw, 38px) 0 0;
}

.page-about .about-team__seg {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  padding: 10px 4px;
  color: var(--ink);
  flex: 1 1 0;
  outline-offset: 3px;
  transition: filter 0.2s var(--ease);
}

.page-about .about-team__seg--data { flex-grow: 22; background: var(--lava); }
.page-about .about-team__seg--nav { flex-grow: 12; background: var(--sky); }
.page-about .about-team__seg--support { flex-grow: 8; background: var(--flag-green); }

.page-about .about-team__seg-num {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-team__seg-name {
  display: none;
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(3px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-team__seg:hover,
.page-about .about-team__seg:focus {
  filter: brightness(1.08);
}

.page-about .about-team__seg:hover .about-team__seg-name,
.page-about .about-team__seg:focus .about-team__seg-name {
  opacity: 1;
  transform: none;
}

.page-about .about-team__notes {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-team__notes li {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-team__notes p:last-child {
  margin-bottom: 0;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 4vw, 40px) 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .about-figure__cap {
  margin: 0;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--dim);
  border-top: 1px solid var(--line);
}

/* ---------- 比赛日（米白翻页） ---------- */
.page-about .about-day {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(44px, 7vw, 96px) 0;
  margin: clamp(24px, 5vw, 60px) 0;
}

.page-about .about-day .about-rail {
  color: var(--about-dim-ink);
}

.page-about .about-day .about-rail__num {
  color: #B8420F;
}

.page-about .about-day .about-row__body h2 {
  color: var(--ink);
}

.page-about .about-day .about-row__body h3 {
  color: var(--ink);
}

.page-about .about-day__lead {
  max-width: 34em;
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-dim-ink);
}

.page-about .about-jump {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: clamp(24px, 4vw, 36px);
  scrollbar-width: thin;
}

.page-about .about-jump a {
  flex: 0 0 auto;
  padding: 7px 12px;
  border: 1px solid var(--about-hair-ink);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

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

.page-about .about-step {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 32px;
  scroll-margin-top: 96px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 20px;
  bottom: 0;
  width: 1px;
  background: var(--about-hair-ink);
}

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

.page-about .about-step__dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--about-dim-ink);
  background: var(--paper);
}

.page-about .about-step--done .about-step__dot {
  background: var(--flag-green);
  border-color: var(--flag-green);
}

.page-about .about-step--now .about-step__dot {
  background: var(--lava);
  border-color: var(--lava);
}

.page-about .about-step__when {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--about-dim-ink);
  margin-bottom: 6px;
}

.page-about .about-step--now .about-step__when {
  color: #B8420F;
  font-weight: 700;
}

.page-about .about-step__body p {
  margin-bottom: 0;
  color: var(--about-dim-ink);
  max-width: 36em;
}

.page-about .about-day .about-figure {
  border-color: var(--about-hair-ink);
  background: #EAE2D6;
  margin-bottom: 0;
}

.page-about .about-day .about-figure__cap {
  border-top-color: var(--about-hair-ink);
  color: var(--about-dim-ink);
}

/* ---------- 演进 ---------- */
.page-about .about-evo {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: evo;
}

.page-about .about-evo__item {
  display: grid;
  gap: 6px;
  padding: 0 0 clamp(20px, 3vw, 28px);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .about-evo__item:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-evo__when {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--flag-yellow);
  margin: 0;
}

.page-about .about-evo__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-evo__link {
  margin: 10px 0 0;
  font-size: 14px;
}

/* ---------- 准则 ---------- */
.page-about .about-rules__lead {
  max-width: 32em;
}

.page-about .about-rules__list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-rule summary {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  padding: clamp(16px, 2.4vw, 24px) 2px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-rule summary:focus-visible {
  outline: 1px solid var(--lava);
  outline-offset: 2px;
}

.page-about .about-rule__num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lava);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rule__title {
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-rule__hint {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--dim);
  white-space: nowrap;
}

.page-about .about-rule[open] .about-rule__hint {
  color: var(--ember);
}

.page-about .about-rule__text {
  margin: 0;
  padding: 0 2px clamp(20px, 3vw, 28px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
  max-width: 36em;
  border-left: 1px solid var(--line);
  padding-left: 16px;
  margin-left: clamp(40px, 6vw, 62px);
}

/* ---------- 节奏与合作 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-rhythm__col {
  border: 1px solid var(--line);
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-2);
}

.page-about .about-rhythm__col p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-rhythm__link {
  margin: 14px 0 0;
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  align-items: start;
  border-top: 2px solid var(--lava);
  padding-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-cta p {
  margin-bottom: 0;
  max-width: 36em;
}

.page-about .about-cta__btn {
  justify-self: start;
  text-decoration: none;
}

.page-about .about-cta__btn:hover {
  text-decoration: none;
}

.page-about .about-night {
  margin: clamp(44px, 7vw, 92px) 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-night .about-figure__cap {
  border-top: 0;
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}

.page-about .about-coda {
  padding: clamp(34px, 5vw, 64px) 0 clamp(10px, 2vw, 20px);
}

.page-about .about-coda__line {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(22px, 4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-coda__line--brand {
  color: var(--ember);
  font-size: clamp(15px, 2vw, 19px);
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-top: clamp(16px, 2.4vw, 24px);
}

/* ---------- 断点：平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-team__seg-name {
    display: block;
  }

  .page-about .about-team__notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 28px);
  }

  .page-about .about-evo__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 32px);
  }

  .page-about .about-evo__when {
    padding-top: 3px;
    text-align: right;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(230px, 0.45fr);
  }

  .page-about .about-row {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4.4vw, 68px);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 32px;
    align-self: start;
    padding-right: 18px;
    border-right: 1px solid var(--line);
    text-align: left;
  }

  .page-about .about-day .about-rail {
    border-right-color: var(--about-hair-ink);
  }

  .page-about .about-rule__text {
    margin-left: clamp(52px, 6vw, 74px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__seg,
  .page-about .about-team__seg-name,
  .page-about .about-jump a {
    transition: none;
  }

  .page-about .about-team__seg-name {
    opacity: 1;
    transform: none;
  }
}
<<<END>>>