.page-about {
  --about-rail: 190px;
  --about-gap: clamp(20px, 4vw, 48px);
  background: var(--ink);
  color: var(--bone);
}

.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 22px);
  padding-bottom: clamp(10px, 2vw, 16px);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-dim);
}

.page-about .breadcrumbs a {
  color: var(--steel);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--signal);
}

/* ---------- 报头式开篇 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(30px, 7vw, 78px) 0 clamp(30px, 6vw, 62px);
  border-bottom: 1px solid var(--rock);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .4;
  filter: saturate(.65) contrast(1.05);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(11, 13, 15, .74);
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.4rem, 8.5vw, 5.4rem);
  line-height: 1.02;
  font-weight: 300;
  letter-spacing: -.01em;
  max-width: 20ch;
}

.page-about .about-hero__accent {
  color: var(--lava);
  font-weight: 400;
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 3vw, 26px);
  max-width: 58ch;
  color: var(--text-soft);
  font-size: clamp(1rem, 1.6vw, 1.125rem);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--lava);
  font-size: .95rem;
  color: var(--text-soft);
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  line-height: 1;
  color: var(--signal);
  letter-spacing: -.02em;
}

/* ---------- 窄栏 + 宽栏长文 ---------- */

.page-about .about-origin {
  background: var(--ink);
}

.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-rail {
  border-left: 1px solid var(--rock);
  padding-left: 14px;
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--clay);
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  color: var(--text-soft);
  text-decoration: none;
  font-size: .95rem;
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-rail__list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--lava);
  transform: translateX(2px);
}

.page-about .about-rail__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-body {
  max-width: 68ch;
}

.page-about .about-body h2 {
  margin-top: 8px;
}

.page-about .about-body p {
  color: var(--text-soft);
  line-height: 1.8;
}

.page-about .about-quote {
  margin: clamp(20px, 4vw, 32px) 0;
  padding: 6px 0 6px 18px;
  border-left: 4px solid var(--lava);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  line-height: 1.5;
  color: var(--bone);
}

.page-about .about-mini {
  margin-top: clamp(22px, 4vw, 34px);
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .about-mini > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-2);
  border: 1px solid var(--rock);
  border-radius: 2px 16px 16px 16px;
  font-size: .88rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ---------- 团队磁贴 ---------- */

.page-about .about-team {
  background: var(--ink-2);
  border-top: 1px solid var(--rock);
  border-bottom: 1px solid var(--rock);
}

.page-about .about-team__lede {
  max-width: 54ch;
  margin-top: 14px;
  color: var(--text-soft);
}

.page-about .about-team__grid {
  margin-top: clamp(20px, 4vw, 34px);
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .about-tile {
  --accent: var(--rock);
  position: relative;
  padding: 20px 20px 24px;
  background: var(--ink);
  border: 1px solid var(--rock);
  border-radius: 2px 18px 18px 18px;
  transition: transform .25s var(--ease), border-color .25s var(--ease);
  outline-offset: 3px;
}

.page-about .about-tile::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 16px 16px;
  border-color: transparent transparent var(--accent) transparent;
}

.page-about .about-tile--moss { --accent: var(--moss); }
.page-about .about-tile--clay { --accent: var(--clay); }
.page-about .about-tile--steel { --accent: var(--steel); }
.page-about .about-tile--lava { --accent: var(--lava); }

.page-about .about-tile:hover,
.page-about .about-tile:focus-within {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.page-about .about-tile__index {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--accent);
}

.page-about .about-tile h3 {
  margin: 0 0 10px;
  color: var(--white);
}

.page-about .about-tile p {
  font-size: .94rem;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-tile__more {
  margin-top: 10px;
  color: var(--text-dim) !important;
  font-size: .86rem !important;
  border-top: 1px dashed var(--rock);
  padding-top: 10px;
}

.page-about .about-team__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

/* ---------- 比赛日流程（米白阅读区） ---------- */

.page-about .about-process {
  background: var(--bone);
  color: var(--ink);
}

.page-about .about-process .eyebrow {
  color: var(--clay);
}

.page-about .about-process__inner {
  max-width: 72ch;
}

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

.page-about .about-process__lede {
  margin-top: 14px;
  color: rgba(11, 13, 15, .74);
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 18px 0;
  border-top: 1px solid rgba(11, 13, 15, .16);
}

.page-about .about-steps li:last-child {
  border-bottom: 1px solid rgba(11, 13, 15, .16);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--clay);
  padding-top: 5px;
}

.page-about .about-steps__time {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--moss);
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.3rem);
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-steps__body {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(11, 13, 15, .76);
}

.page-about .about-process__figure {
  margin: clamp(24px, 4vw, 38px) 0 0;
}

.page-about .about-process .media__caption {
  color: rgba(11, 13, 15, .7);
}

/* ---------- 斜线里程碑 ---------- */

.page-about .about-miles__band {
  position: relative;
  margin-top: clamp(22px, 4vw, 36px);
  padding: clamp(22px, 4vw, 40px) clamp(16px, 3vw, 34px);
  background: var(--ink-2);
  border: 1px solid var(--rock);
  border-radius: 2px 20px 2px 20px;
}

.page-about .about-miles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-mile {
  position: relative;
  padding: 18px 0 18px 20px;
  border-left: 1px solid var(--rock);
}

.page-about .about-mile::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--lava);
  transform: rotate(45deg);
}

.page-about .about-mile:last-child::before {
  background: var(--signal);
}

.page-about .about-mile__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--signal);
}

.page-about .about-mile__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.25rem);
  color: var(--white);
}

.page-about .about-mile p:last-child {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  background: var(--ink);
}

.page-about .about-partners__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}

.page-about .about-partners__text h2 {
  margin-top: 8px;
}

.page-about .about-partners__text p {
  color: var(--text-soft);
  line-height: 1.8;
}

.page-about .about-partners__tags-label {
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.page-about .about-tags .chip {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--rock);
  background: var(--ink-2);
  color: var(--text-soft);
  font-size: 13px;
  border-radius: 2px 10px 10px 10px;
}

.page-about .about-partners__cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partner-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  background: var(--ink-2);
  border: 1px solid var(--rock);
  border-left: 3px solid var(--moss);
  border-radius: 2px 16px 16px 2px;
}

.page-about .about-partner-card:nth-child(2) {
  border-left-color: var(--clay);
}

.page-about .about-partner-card:nth-child(3) {
  border-left-color: var(--signal);
}

.page-about .about-partner-card__label {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-cta__panel {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  padding: clamp(22px, 4vw, 34px);
  border-radius: 2px 20px 20px 20px;
}

.page-about .about-cta__lead h2 {
  margin: 0 0 10px;
  color: var(--white);
}

.page-about .about-cta__lead p {
  margin: 0;
  max-width: 52ch;
  color: var(--text-soft);
  line-height: 1.75;
}

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

.page-about .about-cta__links .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ---------- 断点 ---------- */

@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-hero__facts li {
    flex-direction: column;
    gap: 6px;
  }

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

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-tile:nth-child(1) { grid-column: span 3; }
  .page-about .about-tile:nth-child(2) { grid-column: span 3; }
  .page-about .about-tile:nth-child(3) { grid-column: span 2; }
  .page-about .about-tile:nth-child(4) { grid-column: span 4; }

  .page-about .about-miles__band {
    padding-left: clamp(32px, 5vw, 56px);
    padding-right: clamp(32px, 5vw, 56px);
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
    border-radius: 0;
  }

  .page-about .about-miles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(24px, 4vw, 44px);
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-mile {
    padding-left: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-tile__more {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height .3s var(--ease), opacity .3s var(--ease),
      margin-top .3s var(--ease), padding-top .3s var(--ease);
  }

  .page-about .about-tile:hover .about-tile__more,
  .page-about .about-tile:focus-within .about-tile__more,
  .page-about .about-tile:focus .about-tile__more {
    max-height: 8em;
    opacity: 1;
    margin-top: 10px;
    padding-top: 10px;
    border-top-color: var(--rock);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tile,
  .page-about .about-rail__list a,
  .page-about .about-tile__more {
    transition: none;
  }

  .page-about .about-tile:hover,
  .page-about .about-tile:focus-within,
  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    transform: none;
  }

  .page-about .about-miles__band {
    clip-path: none;
  }
}
<<<END>>>