.page-about {
  --about-sec: clamp(52px, 8.5vw, 104px);
  --about-gap: clamp(18px, 2.6vw, 34px);
  --about-dot: 24px;
  --about-dotgap: 16px;
  font-family: var(--font-sans);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(16px, 2.2vw, 26px);
}

.page-about .crumbs {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .crumbs span[aria-hidden] {
  margin: 0 8px;
  color: var(--rule);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 4.5vw, 54px) 0 clamp(54px, 8vw, 104px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4.4vw, 52px);
  align-items: start;
}

.page-about .about-h1 {
  margin: 16px 0 0;
  font-size: clamp(30px, 6.6vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 20px 16px;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: clamp(20px, 2.6vw, 28px) 0 0;
  border-top: 1px solid var(--rule);
  list-style: none;
}

.page-about .about-facts__v {
  display: block;
  font-size: clamp(26px, 4.2vw, 42px);
  font-weight: 600;
  line-height: 1.05;
  color: var(--cyan);
}

.page-about .about-facts__l {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.11em;
  color: var(--muted);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
}

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

/* ---------- 章节标题通用 ---------- */
.page-about .about-head {
  max-width: 44em;
}

.page-about .about-h2 {
  margin: 16px 0 0;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  font-weight: 900;
}

.page-about .about-sub {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 日常工作 ---------- */
.page-about .about-daily {
  padding: var(--about-sec) 0;
}

.page-about .about-duty {
  display: grid;
  gap: var(--about-gap);
  margin: clamp(30px, 4.4vw, 52px) 0 0;
  list-style: none;
}

.page-about .about-duty__i {
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  transition: border-color var(--t);
}

.page-about .about-duty__i:hover {
  border-top-color: var(--cyan);
}

.page-about .about-duty__n {
  display: inline-block;
  padding-bottom: 5px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--gold);
  border-bottom: 2px solid var(--gold);
}

.page-about .about-duty__t {
  margin: 16px 0 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-duty__d {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 从终场到上线 ---------- */
.page-about .about-flow {
  padding: var(--about-sec) 0;
}

.page-about .about-flow__inner {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
  align-items: start;
}

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

.page-about .about-steps {
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
  transition: border-color var(--t);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-step:hover {
  border-top-color: var(--orange);
}

.page-about .about-step__n {
  padding-top: 3px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-step__c h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-step__c p {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 38em;
}

.page-about .about-step__who {
  grid-column: 2;
  justify-self: start;
  margin-top: 14px;
  padding: 4px 11px;
  border: 1px solid var(--rule);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  transition: color var(--t), border-color var(--t);
}

.page-about .about-step:hover .about-step__who {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  padding: var(--about-sec) 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(20px, 2.6vw, 32px);
  margin: clamp(30px, 4.4vw, 54px) 0 0;
}

.page-about .about-role {
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  transition: border-color var(--t);
}

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

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .about-role__n {
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-role__u {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-role h3 {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-role p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 九个赛季时间线 ---------- */
.page-about .about-tlband {
  padding: var(--about-sec) 0;
}

.page-about .about-tl {
  position: relative;
  margin: clamp(30px, 4.4vw, 54px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: var(--rule);
}

.page-about .about-tl__sum {
  display: grid;
  grid-template-columns: var(--about-dot) minmax(0, 1fr);
  column-gap: var(--about-dotgap);
  align-items: start;
  padding: 18px 0 6px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__sum::marker {
  content: "";
}

.page-about .about-tl__dot {
  width: 11px;
  height: 11px;
  margin: 7px 0 0 0;
  box-sizing: border-box;
  background: var(--graphite);
  border: 2px solid var(--gold);
  position: relative;
  z-index: 1;
  transition: background var(--t), border-color var(--t);
}

.page-about .about-tl__row details[open] .about-tl__dot {
  background: var(--gold);
}

.page-about .about-tl__sum:hover .about-tl__dot,
.page-about .about-tl__sum:focus-visible .about-tl__dot {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-tl__meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.page-about .about-tl__title {
  font-size: clamp(17px, 2.1vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  transition: color var(--t);
}

.page-about .about-tl__sum:hover .about-tl__title {
  color: var(--cyan);
}

.page-about .about-tl__body {
  margin-left: calc(var(--about-dot) + var(--about-dotgap));
  padding: 4px 0 24px;
}

.page-about .about-tl__body p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-tl__figrow {
  margin: 0 0 6px;
  padding-left: calc(var(--about-dot) + var(--about-dotgap));
}

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

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

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: var(--about-sec) 0;
}

.page-about .about-eco__inner {
  display: grid;
  gap: clamp(30px, 4.4vw, 56px);
  align-items: start;
}

.page-about .about-eco__big {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  font-size: clamp(56px, 12vw, 132px);
  font-weight: 600;
  line-height: 0.92;
  color: var(--gold);
}

.page-about .about-eco__unit {
  margin: 12px 0 0;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .about-eco__note {
  margin: 18px 0 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-eco__list li {
  padding: 20px 0;
  border-top: 1px solid var(--rule);
  transition: border-color var(--t);
}

.page-about .about-eco__list li:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-eco__list li:hover {
  border-top-color: var(--cyan);
}

.page-about .about-eco__list h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-eco__list p {
  margin: 9px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 阅读路径 ---------- */
.page-about .about-next {
  padding: var(--about-sec) 0 clamp(64px, 9vw, 120px);
}

.page-about .about-next__list {
  display: grid;
  gap: var(--about-gap);
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__i {
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  transition: border-color var(--t);
}

.page-about .about-next__i:hover {
  border-top-color: var(--cyan);
}

.page-about .about-next__a {
  display: inline-block;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 2px solid var(--rule);
  padding-bottom: 4px;
  transition: color var(--t), border-color var(--t);
}

.page-about .about-next__a:hover,
.page-about .about-next__a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-next__d {
  display: block;
  margin-top: 12px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-duty {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(22px, 3vw, 38px);
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-hero__media .media {
    box-shadow: 12px 12px 0 0 var(--grass-2);
  }

  .page-about .about-flow__inner {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-flow__media {
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }

  .page-about .about-eco__inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(36px, 5vw, 72px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-duty {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 clamp(20px, 2.4vw, 34px);
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: clamp(22px, 2.6vw, 34px);
  }

  .page-about .about-role:nth-child(1) {
    grid-column: span 7;
  }

  .page-about .about-role:nth-child(2) {
    grid-column: span 5;
  }

  .page-about .about-role:nth-child(3) {
    grid-column: span 5;
  }

  .page-about .about-role:nth-child(4) {
    grid-column: span 7;
  }
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 420px) {
  .page-about .about-tl__figrow,
  .page-about .about-tl__body {
    margin-left: 0;
    padding-left: 0;
  }

  .page-about .about-tl::before {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}
<<<END>>>