.page-about {
  --about-rail-w: 88px;
  --about-focus: var(--mint-400);
  background: var(--ink-900);
  color: var(--text-050);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* 首屏 */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mint-400);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.2vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0 0 32px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-300);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-350);
  border: 1px solid var(--line-350);
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 18px 20px;
  background: var(--ink-900);
  border-top: 2px solid var(--mint-400);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--mint-400);
}

.page-about .about-facts__label {
  font-size: 13px;
  color: var(--text-300);
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 通栏头图 */
.page-about .about-banner-wrap {
  padding-top: clamp(28px, 5vw, 48px);
}

.page-about .about-banner {
  margin: 0;
  border: 1px solid var(--line-350);
}

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

/* 双栏骨架 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-top: clamp(36px, 6vw, 72px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }
}

/* 章节序号栏 —— 移动端为横向胶囊条 */
.page-about .chapter-rail {
  max-width: 100%;
  overflow: hidden;
}

.page-about .chapter-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .chapter-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line-350);
  color: var(--text-300);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .chapter-rail__link:hover,
.page-about .chapter-rail__link:focus-visible {
  border-color: var(--mint-400);
  color: var(--text-050);
}

.page-about .chapter-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mint-400);
}

@media (min-width: 900px) {
  .page-about .chapter-rail {
    position: sticky;
    top: 96px;
    overflow: visible;
  }

  .page-about .chapter-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line-350);
  }

  .page-about .chapter-rail__link {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    min-height: 0;
    padding: 14px 0 14px 16px;
    border: 0;
  }

  .page-about .chapter-rail__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 8px;
    height: 1px;
    background: var(--line-350);
    transition: width 140ms var(--ease), background 140ms var(--ease);
  }

  .page-about .chapter-rail__link:hover::before,
  .page-about .chapter-rail__link:focus-visible::before {
    width: 18px;
    background: var(--mint-400);
  }

  .page-about .chapter-rail__num {
    font-size: 16px;
  }

  .page-about .chapter-rail__label {
    font-size: 12px;
    line-height: 1.4;
    white-space: normal;
  }
}

/* 章节通用 */
.page-about .about-section {
  padding-top: clamp(32px, 4vw, 56px);
  padding-bottom: clamp(32px, 4vw, 56px);
  border-top: 1px solid var(--line-350);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mint-400);
}

.page-about .about-section h2 {
  margin: 0 0 16px;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-300);
}

.page-about .about-section p a {
  color: var(--mint-400);
  text-decoration: none;
  border-bottom: 1px solid var(--mint-600);
}

.page-about .about-section p a:hover,
.page-about .about-section p a:focus-visible {
  border-bottom-color: var(--mint-400);
}

/* 01 四类内容 */
.page-about .pillars {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--line-350);
  border: 1px solid var(--line-350);
}

@media (min-width: 720px) {
  .page-about .pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .pillar {
  padding: 24px 22px 26px;
  background: var(--ink-900);
}

.page-about .pillar__bar {
  display: block;
  width: 40px;
  height: 3px;
  margin-bottom: 16px;
  background: var(--mint-400);
}

.page-about .pillar--violet .pillar__bar {
  background: var(--violet-400);
}

.page-about .pillar--orange .pillar__bar {
  background: var(--orange-500);
}

.page-about .pillar--amber .pillar__bar {
  background: var(--amber-300);
}

.page-about .pillar h3 {
  margin: 0 0 10px;
  font-family: var(--font-headline);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--text-050);
}

.page-about .pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-300);
}

/* 02 三个小组：4/5/3 不等宽 */
.page-about .squads {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.page-about .squad {
  padding: 24px 22px;
  border: 1px solid var(--line-350);
  background: var(--ink-900);
}

.page-about .squad__meta {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-500);
}

.page-about .squad h3 {
  margin: 0 0 12px;
  font-family: var(--font-headline);
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--text-050);
}

.page-about .squad p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-300);
}

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

@media (min-width: 900px) {
  .page-about .squads {
    grid-template-columns: 4fr 5fr 3fr;
    gap: 0;
    border: 1px solid var(--line-350);
  }

  .page-about .squad {
    border: 0;
    border-left: 1px solid var(--line-350);
    padding: 28px 24px;
  }

  .page-about .squad:first-child {
    border-left: 0;
  }

  .page-about .squad--focus {
    background: var(--ink-800);
    box-shadow: inset 0 3px 0 var(--orange-500);
  }
}

.page-about .squad-support {
  margin: 16px 0 0;
  padding: 18px 22px;
  border-left: 2px solid var(--mint-400);
  background: var(--ink-800);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-300);
}

.page-about .squad-media {
  max-width: 560px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  border: 1px solid var(--line-350);
}

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

/* 03 流程步骤带 */
.page-about .flow-steps {
  display: grid;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  position: relative;
  padding: 24px 22px 26px;
  border: 1px solid var(--line-350);
  background: var(--ink-800);
  transition: background 160ms var(--ease);
}

.page-about .flow-step__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-headline);
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mint-400);
}

.page-about .flow-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-headline);
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--text-050);
}

.page-about .flow-step p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-300);
}

.page-about .flow-step .flow-step__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--orange-500);
}

@media (hover: hover) {
  .page-about .flow-step:hover {
    background: var(--ink-700);
  }
}

@media (min-width: 900px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .flow-step {
    margin-left: -20px;
    padding: 28px 34px 28px 24px;
    border: 0;
    clip-path: polygon(0 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
  }

  .page-about .flow-step:first-child {
    margin-left: 0;
    padding-left: 24px;
    clip-path: none;
  }
}

/* 04 球队档案 */
.page-about .library {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

@media (min-width: 900px) {
  .page-about .library {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .tagset {
  display: grid;
  gap: 1px;
  margin: 0 0 20px;
  padding: 0;
  background: var(--line-350);
  border: 1px solid var(--line-350);
}

@media (min-width: 600px) {
  .page-about .tagset {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .tagset__row {
  padding: 14px 16px;
  background: var(--ink-900);
}

.page-about .tagset__row dt {
  margin-bottom: 4px;
  font-family: var(--font-headline);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--mint-400);
}

.page-about .tagset__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-300);
}

.page-about .library__text > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-300);
}

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

.page-about .library__media .media-frame {
  border: 1px solid var(--line-350);
}

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

.page-about .library__media .media-frame__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-300);
}

/* 05 合作与认可 */
.page-about .partners {
  display: grid;
  gap: 32px;
  margin-top: 28px;
  align-items: center;
}

@media (min-width: 820px) {
  .page-about .partners {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 44px;
  }
}

.page-about .partners__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-350);
}

.page-about .partners__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-350);
}

@media (min-width: 640px) {
  .page-about .partners__item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .partners__item h3 {
  margin: 0;
  font-family: var(--font-headline);
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--text-050);
}

.page-about .partners__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-300);
}

.page-about .partners__orbit {
  display: grid;
  justify-items: center;
  gap: 12px;
  margin: 0;
  padding: 24px;
  border: 1px solid var(--line-350);
  background:
    radial-gradient(circle at 50% 45%, rgba(47, 243, 196, 0.12), transparent 66%),
    var(--ink-800);
}

.page-about .partners__orbit svg {
  display: block;
  width: min(240px, 100%);
  height: auto;
}

.page-about .partners__orbit figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint-400);
}

.page-about .award {
  margin: 32px 0 0;
  padding: 20px 22px;
  border: 1px solid var(--line-350);
  border-left: 3px solid var(--amber-300);
  background: linear-gradient(90deg, rgba(255, 194, 75, 0.12), transparent 72%);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-050);
}

/* 06 机构合作 */
.page-about .institution-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-about .institution-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 28px;
  }
}

.page-about .institution-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-300);
}

.page-about .institution-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--mint-400);
}

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

.page-about .about-close {
  margin: 28px 0 0;
  padding-top: 24px;
  max-width: 68ch;
  border-top: 1px solid var(--line-350);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-300);
}
<<<END>>>