.page-about {
  --about-line: rgba(148, 163, 156, 0.28);
  --about-line-strong: rgba(148, 163, 156, 0.46);
  color: var(--fog);
  overflow-x: clip;
}

.page-about .about-crumbs {
  padding-top: 16px;
  padding-bottom: 4px;
}

.page-about .about-eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-sec-head {
  margin-bottom: 24px;
}

.page-about .about-sec-head .h2 {
  margin: 0 0 10px;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.25;
}

.page-about .about-sec-lead {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 28px;
  padding-top: 20px;
  padding-bottom: 44px;
}

.page-about .about-kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint);
  border: 2px solid var(--mint);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(29px, 7.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lead {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cold);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 26px 0 0;
}

.page-about .about-fact {
  padding: 10px 12px;
  border: 2px solid var(--about-line);
  background: var(--coal);
}

.page-about .about-fact dt {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cold);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 13px;
  color: var(--fog);
}

.page-about .about-fact dd .mono {
  font-size: 22px;
  color: var(--amber);
  margin-right: 3px;
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__frame {
  margin: 0;
  border: 2px solid var(--about-line-strong);
  background: var(--coal);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 86%, 86% 100%, 0 100%);
}

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

.page-about .about-hero__stamp {
  position: absolute;
  left: 10px;
  bottom: 16px;
  margin: 0;
  padding: 6px 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--coal);
  background: var(--amber);
  border: 2px solid var(--rail);
}

/* ---------- 三条内容线 ---------- */
.page-about .about-lines {
  padding-top: 8px;
  padding-bottom: 44px;
}

.page-about .about-lines__tabs .seg__list {
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-lines__tabs .seg__btn {
  font-family: var(--sans);
  font-size: 14px;
}

.page-about .line-body {
  border: 2px solid var(--about-line);
  background: var(--surface-2);
  padding: 18px 16px;
}

.page-about .line-body__lead {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 40em;
}

.page-about .line-body__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .line-body__list li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--cold);
}

.page-about .line-body__list .mono {
  color: var(--orange);
  font-size: 12px;
  padding-top: 2px;
}

/* ---------- 通道变更 ---------- */
.page-about .about-channel {
  padding-top: 36px;
  padding-bottom: 44px;
  border-top: 2px solid var(--about-line);
}

.page-about .about-channel__body {
  display: grid;
  gap: 22px;
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 2px 10px;
  padding: 14px 14px 16px;
  background: var(--surface-2);
  border: 2px solid var(--about-line);
}

.page-about .steps__num {
  grid-column: 1;
  font-size: 13px;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .steps__item h3 {
  grid-column: 2;
  margin: 0 0 5px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .steps__item p {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cold);
}

.page-about .about-channel__figure {
  margin: 0;
  border: 2px solid var(--about-line-strong);
  background: var(--coal);
}

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

.page-about .about-channel__figure figcaption {
  padding: 10px 12px;
  border-top: 2px solid var(--about-line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cold);
}

.page-about .about-channel__more {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
}

/* ---------- 通栏主题带 ---------- */
.page-about .about-band {
  position: relative;
  overflow: hidden;
  margin: 36px 0;
  padding: 40px 0 44px;
  background: var(--orange);
  color: var(--coal);
  border-top: 2px solid var(--rail);
  border-bottom: 2px solid var(--rail);
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  top: -10%;
  right: -12%;
  width: 48%;
  height: 120%;
  background: repeating-linear-gradient(
    -12deg,
    rgba(6, 18, 15, 0.16) 0 2px,
    transparent 2px 16px
  );
  pointer-events: none;
}

.page-about .about-band__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-band__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--rail);
  opacity: 0.75;
}

.page-about .about-band__quote {
  margin: 0 0 14px;
  font-size: clamp(23px, 5.4vw, 40px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--rail);
}

.page-about .about-band__sub {
  margin: 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rail);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-top: 12px;
  padding-bottom: 44px;
}

.page-about .about-timeline__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-index {
  border: 2px solid var(--about-line);
  background: var(--rail);
  padding: 10px;
}

.page-about .about-index__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cold);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 10px;
  min-height: 40px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--cold);
  text-decoration: none;
  border: 2px solid transparent;
  background: var(--coal);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.page-about .about-index__link .mono {
  font-size: 11px;
  color: var(--mint);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--fog);
  border-color: var(--orange);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .tl__item {
  position: relative;
  padding-left: 26px;
  scroll-margin-top: 90px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--orange);
  border: 2px solid var(--rail);
  transform: rotate(45deg);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  bottom: -22px;
  width: 2px;
  background: var(--about-line);
  transform: skewX(-8deg);
  transform-origin: top center;
}

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

.page-about .tl__code {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .tl__item h3 {
  margin: 0 0 7px;
  font-size: 19px;
  line-height: 1.35;
  color: var(--fog);
}

.page-about .tl__item p {
  margin: 0 0 10px;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cold);
}

.page-about .tl__gain {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--fog);
}

/* ---------- 团队与标准 ---------- */
.page-about .about-team {
  padding-top: 36px;
  padding-bottom: 44px;
  border-top: 2px solid var(--about-line);
}

.page-about .about-team__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-team__figure {
  margin: 0 0 16px;
  border: 2px solid var(--about-line-strong);
  background: var(--coal);
  overflow: hidden;
}

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

.page-about .about-team__people > p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--cold);
}

.page-about .about-team__note {
  margin-top: 16px !important;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
  color: var(--cold);
}

.page-about .roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.page-about .roles li {
  padding: 10px 6px;
  text-align: center;
  font-size: 12px;
  color: var(--cold);
  border: 2px solid var(--about-line);
  background: var(--surface);
}

.page-about .roles .mono {
  display: block;
  margin-bottom: 2px;
  font-size: 21px;
  color: var(--fog);
}

.page-about .about-team__standards .h3 {
  margin: 0 0 14px;
  font-size: 20px;
  line-height: 1.35;
}

.page-about .std {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .std li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cold);
}

.page-about .std li strong {
  color: var(--fog);
  margin-right: 4px;
}

.page-about .std li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--mint);
  transform: rotate(45deg);
}

.page-about .about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .flow__step {
  align-self: start;
  padding-top: 9px;
  border-top: 2px solid var(--orange);
  font-size: 12px;
  line-height: 1.6;
  color: var(--cold);
}

.page-about .flow__step strong {
  display: block;
  margin: 3px 0 2px;
  font-size: 14px;
  color: var(--fog);
}

.page-about .flow__num {
  font-size: 11px;
  color: var(--mint);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-top: 32px;
  padding-bottom: 56px;
}

.page-about .about-next .h3 {
  margin: 0;
  font-size: 20px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 16px;
  color: var(--fog);
  text-decoration: none;
  border: 2px solid var(--about-line);
  background: var(--surface-2);
  transition: transform 0.16s ease, border-color 0.16s ease;
}

.page-about .about-next__card .mono {
  font-size: 11px;
  color: var(--mint);
}

.page-about .about-next__card strong {
  font-size: 15px;
}

.page-about .about-next__card span:last-child {
  font-size: 13px;
  line-height: 1.7;
  color: var(--cold);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translate(-2px, -2px);
  border-color: var(--orange);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 40px;
    align-items: start;
    padding-top: 32px;
    padding-bottom: 64px;
  }

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

  .page-about .about-channel__body {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 20px;
    padding: 12px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
  }

  .page-about .about-index__link {
    white-space: normal;
    font-size: 12px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .line-body {
    padding: 22px 22px 24px;
  }

  .page-about .about-band {
    margin: 48px 0;
    padding: 52px 0 56px;
  }
}

@media (min-width: 1080px) {
  .page-about .flow {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .flow__step:nth-child(2) {
    margin-top: 8px;
  }

  .page-about .flow__step:nth-child(3) {
    margin-top: 16px;
  }

  .page-about .flow__step:nth-child(4) {
    margin-top: 8px;
  }

  .page-about .flow__step:nth-child(5) {
    margin-top: 18px;
  }

  .page-about .flow__step:nth-child(6) {
    margin-top: 26px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>
```