.page-about {
  --about-gap: clamp(20px, 3vw, 34px);
  --about-rule: 1px solid var(--line-soft);
  background:
    radial-gradient(900px 520px at 88% -8%, rgba(79, 242, 208, 0.10), transparent 62%),
    radial-gradient(700px 460px at -10% 30%, rgba(139, 92, 246, 0.09), transparent 65%),
    linear-gradient(180deg, var(--ink) 0%, var(--char) 72%, var(--ink) 100%);
  color: var(--cream);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 30px);
  margin-bottom: clamp(16px, 3vw, 26px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

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

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

.page-about .about-crumb span[aria-current] {
  color: var(--cyan);
}

/* ---------- 首屏拼贴 ---------- */

.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(18px, 3vw, 32px);
  border-top: 3px solid var(--cyan);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 44em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .hero-board {
  position: relative;
  padding: clamp(18px, 3vw, 26px);
  border: 2px solid var(--line);
  background: linear-gradient(152deg, var(--moss) 0%, var(--ink) 88%);
  box-shadow: var(--shadow-hard);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .board-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--marble, var(--mist));
}

.page-about .board-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .board-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(191, 216, 208, 0.28);
}

.page-about .board-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .board-num {
  flex: 0 0 auto;
  min-width: 3.8ch;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .board-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  margin-top: clamp(34px, 6vw, 70px);
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-toc {
  border: 1px solid var(--line-soft);
  padding: 14px 14px 16px;
  background: rgba(17, 22, 20, 0.62);
}

.page-about .toc-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 6px 9px 0;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--cyan);
}

.page-about .toc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

.page-about .toc-link[aria-current="true"] .toc-num {
  color: var(--orange);
}

.page-about .toc-back {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
  text-decoration: none;
}

.page-about .toc-back:hover,
.page-about .toc-back:focus-visible {
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */

.page-about .about-article > section {
  padding-top: clamp(22px, 3.5vw, 34px);
  margin-bottom: clamp(38px, 6vw, 76px);
  border-top: var(--about-rule);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-article > section:first-child {
  border-top: 2px solid var(--moss);
}

.page-about .sec-index {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .sec-index span {
  color: var(--cyan);
  font-weight: 700;
  font-size: 13px;
}

.page-about .about-article h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.005em;
  text-wrap: balance;
}

.page-about .about-article p {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-article h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-figure {
  margin: clamp(20px, 3vw, 28px) 0 0;
  border: 1px solid var(--line);
  background: var(--char);
  padding: 8px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-figure .figure-frame__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .about-figure--narrow {
  max-width: 640px;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 58%, rgba(47, 107, 82, 0.2) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 22px 34px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--cyan);
  background: var(--char);
  transform: rotate(45deg);
  transition: background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cyan);
  border-color: var(--orange);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .tl-item:hover .tl-year,
.page-about .tl-item:focus-within .tl-year {
  color: var(--orange);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 四步流程 ---------- */

.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-step {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  background: rgba(47, 107, 82, 0.22);
}

.page-about .flow-step--2 {
  border-left-color: var(--violet);
  background: rgba(139, 92, 246, 0.12);
}

.page-about .flow-step--3 {
  border-left-color: var(--orange);
  background: rgba(242, 106, 46, 0.10);
}

.page-about .flow-step--4 {
  border-left-color: var(--clay);
  background: rgba(201, 123, 90, 0.12);
}

.page-about .flow-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .flow-step h3 {
  margin: 0 0 6px;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .note {
  margin-top: clamp(20px, 3vw, 28px);
  max-width: none;
  padding: 14px 16px;
  border-left: 4px solid var(--clay);
  background: rgba(201, 123, 90, 0.10);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cream);
}

/* ---------- 团队分工 ---------- */

.page-about .team-board {
  position: relative;
  margin-top: clamp(18px, 3vw, 24px);
}

.page-about .team-board > input[type="radio"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .team-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .team-filters label {
  padding: 7px 13px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .team-filters label:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about #tf-all:checked ~ .team-filters label[for="tf-all"],
.page-about #tf-edit:checked ~ .team-filters label[for="tf-edit"],
.page-about #tf-label:checked ~ .team-filters label[for="tf-label"],
.page-about #tf-ops:checked ~ .team-filters label[for="tf-ops"],
.page-about #tf-care:checked ~ .team-filters label[for="tf-care"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--char);
  font-weight: 700;
}

.page-about #tf-edit:checked ~ .team-grid .team-card:not([data-team="edit"]),
.page-about #tf-label:checked ~ .team-grid .team-card:not([data-team="label"]),
.page-about #tf-ops:checked ~ .team-grid .team-card:not([data-team="ops"]),
.page-about #tf-care:checked ~ .team-grid .team-card:not([data-team="care"]) {
  display: none;
}

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

.page-about .team-card {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--moss);
  background: rgba(17, 22, 20, 0.7);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .team-card:hover {
  border-top-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(191, 216, 208, 0.24);
}

.page-about .team-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--cream);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .team-card p:not(.team-head) {
  margin: 0;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 联赛覆盖 ---------- */

.page-about .league-grid {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 24px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .lg-card {
  padding: 14px 14px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(47, 107, 82, 0.34), rgba(11, 42, 35, 0.9));
}

.page-about .lg-card--violet {
  background: linear-gradient(160deg, rgba(139, 92, 246, 0.24), rgba(11, 42, 35, 0.9));
}

.page-about .lg-card--clay {
  background: linear-gradient(160deg, rgba(201, 123, 90, 0.24), rgba(11, 42, 35, 0.9));
}

.page-about .lg-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .lg-card--clay .lg-num {
  color: var(--orange);
}

.page-about .lg-label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 服务与响应 ---------- */

.page-about .contact-card {
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(16px, 3vw, 24px);
  border: 2px solid var(--cyan);
  background: rgba(11, 42, 35, 0.86);
  box-shadow: var(--shadow-soft);
}

.page-about .contact-card-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .contact-list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .contact-list > div {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(191, 216, 208, 0.24);
}

.page-about .contact-list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .contact-list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .contact-list dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--cream);
  overflow-wrap: anywhere;
}

.page-about .contact-list a {
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 242, 208, 0.5);
}

.page-about .contact-list a:hover,
.page-about .contact-list a:focus-visible {
  color: var(--cyan);
}

.page-about .contact-note {
  margin: 14px 0 0;
  max-width: none;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 合作与认可 ---------- */

.page-about .partner-list {
  list-style: none;
  margin: clamp(18px, 3vw, 24px) 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .partner-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--violet);
  background: rgba(17, 22, 20, 0.62);
}

.page-about .partner-num {
  flex: 0 0 auto;
  min-width: 2.6ch;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--cyan);
}

.page-about .partner-txt {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(26px, 4vw, 38px);
  padding: clamp(18px, 3vw, 26px);
  border: 2px solid var(--moss);
  background: linear-gradient(135deg, rgba(47, 107, 82, 0.4), rgba(17, 22, 20, 0.92));
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-cta h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.28;
  color: var(--cream);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 38em;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

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

/* ---------- 断点 ---------- */

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

  .page-about .league-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 226px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

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

@media (min-width: 1280px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 1039px) {
  .page-about .toc-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .page-about .toc-list li {
    flex: 0 0 auto;
  }

  .page-about .toc-link {
    padding: 8px 12px;
    border: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-soft);
    white-space: nowrap;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible {
    transform: none;
  }
}

@media (max-width: 420px) {
  .page-about .league-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-figure {
    padding: 6px;
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.45);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link,
  .page-about .team-card,
  .page-about .tl-item::before,
  .page-about .tl-year,
  .page-about .team-filters label {
    transition: none;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible,
  .page-about .team-card:hover {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --marble: currentColor;
}