.page-about {
  --ab-railw: 216px;
  --ab-gap: clamp(24px, 4vw, 56px);
  --ab-pad: clamp(36px, 6vw, 76px);
  background: var(--ink);
  color: var(--white);
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-top {
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-about .about-hero {
  margin-top: clamp(20px, 4vw, 40px);
  max-width: 1040px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.5vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 14px 0 0;
  color: var(--white);
}

.page-about .about-hero__em {
  color: var(--orange);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.92em;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 54ch;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-hero__figures {
  list-style: none;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-fig {
  flex: 1 1 140px;
  padding: 18px 12px 0 0;
}

.page-about .about-fig__num {
  display: block;
  font-size: clamp(30px, 7vw, 48px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-fig:nth-child(2) .about-fig__num {
  color: var(--orange);
}

.page-about .about-fig:nth-child(3) .about-fig__num {
  color: var(--white);
}

.page-about .about-fig__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--muted);
}

/* 索引侧栏 */
.page-about .about-shell {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__title {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--silver);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

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

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--lime);
  color: var(--white);
}

.page-about .about-rail__list a:hover .mono,
.page-about .about-rail__list a:focus-visible .mono {
  color: var(--lime);
}

.page-about .about-rail__top {
  display: none;
}

/* 章节 */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-sec {
  padding-block: var(--ab-pad);
  border-top: 1px solid var(--line);
}

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

.page-about .about-sec__h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 5vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.005em;
  margin: 12px 0 0;
  color: var(--white);
}

.page-about .about-sec__intro {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-sec.is-current > .eyebrow {
  color: var(--lime);
}

.page-about .about-sec__cols {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .about-sec__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

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

.page-about .about-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 255, 61, 0.35);
  padding-bottom: 1px;
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

.page-about .about-sec__text .btn {
  margin-top: 18px;
}

/* 图片容器 */
.page-about .about-plate {
  margin: 0;
}

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

.page-about .about-plate .plate__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-plate--square {
  max-width: 560px;
}

/* 流水线 */
.page-about .pipe {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .pipe__step {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

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

.page-about .pipe__no {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .pipe__step h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 6px 0 8px;
  color: var(--white);
}

.page-about .pipe__step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* 数据格 */
.page-about .about-cells {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cells > li {
  background: var(--ink);
  padding: 18px 14px;
}

.page-about .about-cell__num {
  display: block;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.05;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about .about-cells > li:nth-child(even) .about-cell__num {
  color: var(--lime);
}

.page-about .about-cell__num em {
  font-style: normal;
  font-size: 0.46em;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-left: 2px;
}

.page-about .about-cell__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--muted);
}

.page-about .about-cells--tight {
  margin-top: 18px;
}

.page-about .about-sec__cols--media {
  grid-template-columns: minmax(0, 1fr);
  margin-top: clamp(26px, 4vw, 44px);
}

/* 联赛标签 */
.page-about .about-tags {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  margin-top: clamp(22px, 4vw, 32px);
}

.page-about .about-team__lead p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--silver);
}

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

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

.page-about .about-team__stats li {
  background: var(--surface);
  padding: 18px 14px;
}

.page-about .about-team__stats li:first-child {
  background: var(--lime);
}

.page-about .about-team__stats li:first-child .about-cell__num {
  color: var(--ink);
}

.page-about .about-team__stats li:first-child .about-cell__label {
  color: rgba(10, 20, 40, 0.72);
}

/* 里程碑 */
.page-about .miles {
  list-style: none;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--line);
}

.page-about .mile {
  position: relative;
  margin-bottom: 12px;
}

.page-about .mile::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 7px;
  height: 7px;
  background: var(--lime);
  border-radius: 50%;
}

.page-about .mile details {
  background: var(--surface);
  border: 1px solid var(--line);
  transition: border-color 0.18s ease;
}

.page-about .mile details[open] {
  border-color: var(--lime);
}

.page-about .mile summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .mile summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--muted);
}

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

.page-about .mile__year {
  flex: 0 0 auto;
  font-size: 14px;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-about .mile__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .mile__body {
  padding: 0 16px 16px;
}

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

/* 服务范围与荣誉 */
.page-about .about-honor {
  margin-top: clamp(26px, 4vw, 44px);
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--orange);
}

.page-about .about-honor__quote {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.4vw, 26px);
  line-height: 1.4;
  font-weight: 700;
  color: var(--white);
  max-width: 30ch;
}

.page-about .about-honor__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 52ch;
}

/* 路线 */
.page-about .route-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  counter-reset: none;
}

.page-about .route-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .route-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .route-list__no {
  font-size: 12px;
  color: var(--lime);
  letter-spacing: 0.12em;
  padding-top: 3px;
}

.page-about .route-list__text h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .route-list__text p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .route-list li > .about-link {
  grid-column: 2;
  justify-self: start;
  font-size: 13px;
  margin-top: 6px;
}

.page-about .about-cta {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(20px, 3vw, 28px);
  background: var(--glass);
  border: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.page-about .about-cta__text {
  margin: 0;
  flex: 1 1 240px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--silver);
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .pipe {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .route-list li {
    grid-template-columns: 48px minmax(0, 1fr) auto;
    align-items: center;
    gap: 10px 20px;
  }

  .page-about .route-list li > .about-link {
    grid-column: 3;
    margin-top: 0;
  }

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

@media (min-width: 860px) {
  .page-about .about-sec__cols {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .page-about .about-sec__cols--flip .about-sec__figure,
  .page-about .about-sec__cols--flip .about-plate {
    order: -1;
  }

  .page-about .about-sec__cols--media {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .page-about .about-team {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

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

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

@media (min-width: 900px) {
  .page-about .pipe {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .pipe__step::after {
    content: "";
    position: absolute;
    right: -10px;
    top: 50%;
    width: 10px;
    height: 1px;
    background: var(--line);
  }

  .page-about .pipe__step:last-child::after {
    display: none;
  }

  .page-about .about-shell {
    grid-template-columns: var(--ab-railw) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    padding-top: 4px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0;
  }

  .page-about .about-rail__list a {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 10px;
    font-size: 13.5px;
    white-space: normal;
    width: 100%;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--lime);
    background: var(--surface);
  }

  .page-about .about-rail__top {
    display: inline-block;
    margin-top: 18px;
    font-size: 11.5px;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-decoration: none;
    border-bottom: 1px solid var(--line);
    padding-bottom: 3px;
  }

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

@media (min-width: 1120px) {
  .page-about {
    --ab-railw: 248px;
  }

  .page-about .about-sec--grouping .about-sec__cols {
    grid-template-columns: 1fr 0.78fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pipe__step,
  .page-about .mile details,
  .page-about .about-rail__list a,
  .page-about .about-link {
    transition: none;
  }

  .page-about .pipe__step:hover,
  .page-about .pipe__step:focus-within {
    transform: none;
  }
}
<<<END>>>