.page-about {
  --about-cut: 16px;
  --about-tick: rgba(167, 181, 200, .16);
  color: var(--cream);
  background-color: var(--ink-900);
  background-image:
    repeating-linear-gradient(115deg, rgba(167, 181, 200, .035) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(25deg, rgba(167, 181, 200, .022) 0 1px, transparent 1px 64px);
}

.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about a {
  color: var(--ice);
}

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

/* ---------- Hero ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding-block: clamp(18px, 3vw, 34px) clamp(36px, 6vw, 76px);
}

.page-about h1.display-1 {
  font-size: clamp(1.9rem, 4.2vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 12px 0 0;
}

.page-about .about-hero .lead {
  margin-top: 18px;
  color: var(--mist);
  max-width: 46ch;
}

.page-about .hero-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .hero-facts .num {
  font-size: 21px;
  font-weight: 600;
  color: var(--cream);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-board {
  position: relative;
  padding: clamp(14px, 2.4vw, 26px);
  background:
    linear-gradient(158deg, var(--ink-800) 0%, #0b1a2c 62%, var(--deep) 100%);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
  box-shadow: inset 0 0 0 1px rgba(167, 181, 200, .12);
}

.page-about .board-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .b-frame {
  fill: none;
  stroke: rgba(167, 181, 200, .26);
  stroke-width: 1.2;
}

.page-about .b-track {
  fill: none;
  stroke: var(--turf);
  stroke-width: 2;
  stroke-dasharray: 7 6;
  stroke-linecap: round;
}

.page-about .b-node {
  fill: var(--ink-900);
  stroke: var(--turf);
  stroke-width: 2;
}

.page-about .b-node--live {
  fill: var(--yellow);
  stroke: var(--yellow);
}

.page-about .b-scale rect {
  fill: var(--ink-700);
}

.page-about .b-scale rect:nth-child(3) {
  fill: var(--turf);
}

.page-about .b-ticks text {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .board-plate {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--about-tick);
  font-size: 13px;
  color: var(--mist);
}

.page-about .board-plate .num {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--turf-hi);
}

.page-about .board-plate__sep {
  width: 1px;
  height: 14px;
  background: var(--line);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding-block: clamp(34px, 5.5vw, 68px);
}

.page-about .section-head {
  max-width: 62ch;
}

.page-about .section-head .display-2 {
  margin: 10px 0 12px;
}

.page-about .section-note {
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}

/* ---------- 品牌起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-split__aside .display-2 {
  margin: 10px 0 0;
  line-height: 1.22;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-prose p:first-child {
  color: var(--cream);
  font-size: 16px;
}

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

/* ---------- 团队 ---------- */
.page-about .team-media {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
  position: relative;
}

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

.page-about .media-frame figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  color: var(--mist);
  border-top: 1px solid var(--line-soft);
  line-height: 1.6;
}

.page-about .dept-filter {
  margin-top: 26px;
}

.page-about .dept-filter .league-track {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .dept-filter .track-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 13px;
  font-family: var(--font-body);
  color: var(--mist);
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
  cursor: pointer;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .dept-filter .track-tab__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-700);
}

.page-about .dept-filter .track-tab:hover {
  color: var(--cream);
  border-color: rgba(62, 155, 99, .55);
}

.page-about .dept-filter .track-tab[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--turf);
  border-color: var(--turf);
  font-weight: 600;
}

.page-about .dept-filter .track-tab[aria-pressed="true"] .track-tab__no {
  color: rgba(8, 17, 31, .6);
}

.page-about .dept-filter .track-hint {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .dept-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .dept-card {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--ink-800);
  border-top: 2px solid var(--turf);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: transform .22s var(--ease), background .22s var(--ease);
}

.page-about .dept-card:nth-child(2) {
  border-top-color: var(--yellow);
}

.page-about .dept-card:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .dept-card:nth-child(4) {
  border-top-color: var(--moss);
}

.page-about .dept-card:hover {
  transform: translateY(-5px);
  background: var(--ink-700);
}

.page-about .dept-role {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.page-about .dept-num {
  margin: 8px 0 12px;
  font-size: 2rem;
  line-height: 1;
  color: var(--cream);
}

.page-about .dept-num span {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .dept-desc {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .dept-card .tag {
  display: inline-block;
  font-size: 11.5px;
  padding: 3px 9px;
}

/* ---------- 三道关 ---------- */
.page-about .about-process {
  position: relative;
  background: linear-gradient(180deg, rgba(14, 26, 22, .72), rgba(16, 33, 58, .55));
  border-block: 1px solid var(--line-soft);
}

.page-about .check-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: none;
}

.page-about .check-step {
  position: relative;
  padding: 22px 20px 26px;
  background: rgba(8, 17, 31, .72);
  border-left: 3px solid var(--turf);
  outline: none;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .check-step:nth-child(2) {
  border-left-color: var(--moss);
}

.page-about .check-step:nth-child(3) {
  border-left-color: var(--yellow);
}

.page-about .check-step:hover,
.page-about .check-step:focus {
  background: rgba(16, 33, 58, .92);
}

.page-about .check-step::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  background: var(--turf);
  opacity: .8;
}

.page-about .check-step:nth-child(1)::after {
  width: 34%;
}

.page-about .check-step:nth-child(2)::after {
  width: 67%;
  background: var(--moss);
}

.page-about .check-step:nth-child(3)::after {
  width: 100%;
  background: var(--yellow);
}

.page-about .step-no {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--turf-hi);
}

.page-about .check-step h3 {
  margin: 8px 0 10px;
  font-size: 1.15rem;
  color: var(--cream);
}

.page-about .check-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .step-note {
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px !important;
  color: var(--moss) !important;
}

/* ---------- 年份 ---------- */
.page-about .years-layout {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .years-media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-about .year-node {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--about-tick);
}

.page-about .year-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--ink-700);
  box-shadow: 0 0 0 3px rgba(167, 181, 200, .1);
}

.page-about .year-node:has(details[open])::before {
  background: var(--yellow);
  box-shadow: 0 0 0 3px rgba(255, 209, 102, .18);
}

.page-about .year-node details {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .year-node summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 26px 12px 0;
  position: relative;
  outline: none;
}

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

.page-about .year-node summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--mist);
}

.page-about .year-node details[open] summary::after {
  content: "−";
  color: var(--yellow);
}

.page-about .year-node summary:hover .year-title {
  color: var(--turf-hi);
}

.page-about .year-num {
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--yellow);
}

.page-about .year-title {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--cream);
  transition: color .2s var(--ease);
}

.page-about .year-body {
  padding: 0 20px 14px 0;
}

.page-about .year-body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 上海 ---------- */
.page-about .shanghai-layout {
  display: grid;
  gap: 24px;
}

.page-about .shanghai-media .media-frame {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .shanghai-body .display-2 {
  margin: 10px 0 14px;
  line-height: 1.24;
}

.page-about .shanghai-body > p {
  color: var(--mist);
  font-size: 15px;
  line-height: 1.82;
  margin: 0 0 18px;
}

.page-about .shanghai-stats {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.page-about .shanghai-stats li {
  padding: 14px 12px;
  background: var(--ink-800);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .shanghai-stats .num {
  font-size: 1.25rem;
  color: var(--turf-hi);
  font-weight: 600;
}

.page-about .shanghai-stats li > span:last-child {
  font-size: 12px;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .contact-grid {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .contact-grid > div {
  padding: 13px 14px;
  background: var(--ink-900);
}

.page-about .contact-grid dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
  margin-bottom: 5px;
}

.page-about .contact-grid dd {
  margin: 0;
  font-size: 14.5px;
  color: var(--cream);
  word-break: break-word;
}

.page-about .contact-extra {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .coop-panel {
  position: relative;
  padding: clamp(24px, 4vw, 44px);
  background:
    linear-gradient(150deg, rgba(62, 155, 99, .16) 0%, rgba(16, 33, 58, .92) 42%, rgba(8, 17, 31, .96) 100%);
  border-left: 3px solid var(--turf);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .coop-panel .display-2 {
  margin: 10px 0 14px;
}

.page-about .coop-lead {
  margin: 0 0 24px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.82;
  max-width: 68ch;
}

.page-about .coop-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .coop-list li {
  padding-left: 16px;
  border-left: 1px solid var(--moss);
}

.page-about .coop-list h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
  color: var(--cream);
}

.page-about .coop-list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .coop-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

  .page-about .coop-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: clamp(30px, 4.5vw, 60px);
  }

  .page-about .about-split {
    grid-template-columns: 5fr 7fr;
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .years-layout {
    grid-template-columns: 5fr 7fr;
    gap: clamp(26px, 4vw, 52px);
    align-items: start;
  }

  .page-about .years-media {
    position: sticky;
    top: 92px;
  }

  .page-about .shanghai-layout {
    grid-template-columns: 7fr 5fr;
    gap: clamp(26px, 4vw, 52px);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .dept-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .step-note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    margin-top: 0 !important;
    border-top-color: transparent;
    transition: max-height .24s var(--ease), opacity .24s var(--ease), padding-top .24s var(--ease), margin-top .24s var(--ease);
  }

  .page-about .check-step:hover .step-note,
  .page-about .check-step:focus .step-note,
  .page-about .check-step:focus-within .step-note {
    max-height: 180px;
    opacity: 1;
    padding-top: 10px;
    margin-top: 12px !important;
    border-top-color: var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .dept-card,
  .page-about .check-step,
  .page-about .year-title,
  .page-about .step-note {
    transition: none;
  }

  .page-about .dept-card:hover {
    transform: none;
  }
}
<<<END>>>