.page-about {
  --about-gap: clamp(18px, 3vw, 40px);
  --about-pad: clamp(36px, 6vw, 80px);
  --about-line: 1px solid var(--metal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.5vw, 60px) 0 clamp(34px, 5vw, 62px);
  border-bottom: var(--about-line);
  background:
    radial-gradient(620px 340px at 10% -10%, rgba(232, 69, 28, 0.24), transparent 70%),
    radial-gradient(520px 300px at 92% 110%, rgba(58, 90, 120, 0.34), transparent 72%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--metal) 1px, transparent 1px),
    linear-gradient(90deg, var(--metal) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.2;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero__lede h1 {
  margin: 12px 0 18px;
  padding-left: 16px;
  border-left: 4px solid var(--flame);
  font-size: clamp(27px, 4.2vw, 50px);
  line-height: 1.16;
  letter-spacing: 0.03em;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-hero__lede .hb-lead {
  max-width: 44em;
  color: var(--mist-2);
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  border: var(--about-line);
  background: var(--metal);
}

.page-about .about-hero__stat {
  padding: 15px 14px 13px;
  background: var(--ink-2);
}

.page-about .about-hero__num {
  display: inline-block;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--amber);
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist-2);
}

.page-about .about-hero__board {
  position: relative;
  padding: 20px 18px 16px;
  border: var(--about-line);
  background: linear-gradient(158deg, rgba(58, 90, 120, 0.34), rgba(31, 31, 34, 0.94) 62%);
}

.page-about .about-hero__board::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--flame-2), var(--flame-deep));
}

.page-about .about-hero__board-title {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--mist-3);
}

.page-about .about-hero__board-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__board-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-top: var(--about-line);
}

.page-about .about-hero__board-list li:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-hero__bnum {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
  color: var(--mist);
}

.page-about .about-hero__blabel {
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--mist-2);
}

/* ---------- 起点 ---------- */
.page-about .about-why {
  padding: var(--about-pad) 0;
}

.page-about .about-why__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-why__main h2 {
  margin: 10px 0 18px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-why__main p {
  max-width: 42em;
  margin: 0 0 16px;
  color: var(--mist-2);
  line-height: 1.85;
}

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

.page-about .about-why__aside {
  border: var(--about-line);
  border-top: 2px solid var(--flame);
  padding: 20px 18px 8px;
  background: var(--ink-2);
}

.page-about .about-why__aside h3 {
  margin: 0 0 6px;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-why__list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: why;
}

.page-about .about-why__list li {
  position: relative;
  padding: 14px 0 14px 30px;
  border-top: var(--about-line);
  counter-increment: why;
}

.page-about .about-why__list li::before {
  content: counter(why, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 14px;
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--flame);
}

.page-about .about-why__k {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-why__v {
  display: block;
  margin-top: 4px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist-2);
}

/* ---------- 三条生产线 ---------- */
.page-about .about-lines {
  padding: var(--about-pad) 0;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  background: linear-gradient(180deg, var(--ink-3) 0%, var(--ink) 100%);
}

.page-about .about-lines__head {
  max-width: 52em;
}

.page-about .about-lines__head h2 {
  margin: 10px 0 14px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-lines__intro {
  margin: 0;
  color: var(--mist-2);
  line-height: 1.8;
}

.page-about .about-lines__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 30px;
  border: var(--about-line);
  background: var(--metal);
}

.page-about .about-line {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--ink-2);
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 46px;
  background: var(--flame);
}

.page-about .about-line__no {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-line h3 {
  margin: 0 0 10px;
  font-size: 18px;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-line > p {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-2);
}

.page-about .about-line__meta {
  margin: 0;
  border-top: var(--about-line);
}

.page-about .about-line__meta > div {
  display: grid;
  grid-template-columns: 5.6em minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .about-line__meta dt {
  color: var(--mist-3);
}

.page-about .about-line__meta dd {
  margin: 0;
  color: var(--ice-line);
  color: var(--mist-2);
}

.page-about .about-lines__figure {
  margin: 28px 0 0;
}

/* ---------- 赛季归档 ---------- */
.page-about .about-archive {
  padding: var(--about-pad) 0;
  background: var(--ink);
}

.page-about .about-archive__head {
  max-width: 50em;
}

.page-about .about-archive__head h2 {
  margin: 10px 0 14px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-archive__head p:last-child {
  margin: 0;
  color: var(--mist-2);
  line-height: 1.8;
}

.page-about .about-archive__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  margin-top: 30px;
  align-items: start;
}

.page-about .about-archive__panel {
  display: block;
  padding: 22px 20px 18px;
  border-left: 2px solid var(--flame);
  background: linear-gradient(150deg, rgba(58, 90, 120, 0.36), rgba(31, 31, 34, 0.9) 70%);
}

.page-about .about-archive__panel[hidden],
.page-about .about-archive__panel[aria-hidden="true"] {
  display: none;
}

.page-about .about-archive__panel + .about-archive__panel {
  margin-top: 14px;
}

.page-about .about-archive__season {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-archive__panel h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--mist);
}

.page-about .about-archive__panel > p {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist-2);
}

.page-about .about-archive__facts {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-line);
}

.page-about .about-archive__facts li {
  display: grid;
  grid-template-columns: 6.2em minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-bottom: var(--about-line);
  font-size: 13.5px;
  line-height: 1.6;
}

.page-about .about-archive__facts span {
  color: var(--mist-3);
}

.page-about .about-archive__facts strong {
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-archive__hint {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist-3);
}

.page-about .about-archive__track {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-line);
}

.page-about .about-archive__track li {
  border-bottom: var(--about-line);
}

.page-about .about-node {
  display: block;
  width: 100%;
  padding: 14px 14px 14px 16px;
  border: 0;
  border-left: 2px solid var(--metal);
  background: transparent;
  font: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-node:hover {
  border-left-color: var(--amber);
  background: rgba(245, 166, 35, 0.07);
}

.page-about .about-node:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
  border-left-color: var(--amber);
}

.page-about .about-node[aria-selected="true"],
.page-about .about-node.is-active {
  border-left-color: var(--flame);
  background: rgba(232, 69, 28, 0.12);
}

.page-about .about-node__season {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-node__title {
  display: block;
  margin-top: 5px;
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-archive__figure {
  margin: 30px 0 0;
}

/* ---------- 五步流程 ---------- */
.page-about .about-flow {
  padding: var(--about-pad) 0;
  border-top: var(--about-line);
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
}

.page-about .about-flow__head {
  max-width: 50em;
}

.page-about .about-flow__head h2 {
  margin: 10px 0 14px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-flow__head p:last-child {
  margin: 0;
  color: var(--mist-2);
  line-height: 1.8;
}

.page-about .about-flow__rail {
  display: none;
  width: 100%;
  height: auto;
  margin: 30px 0 6px;
}

.page-about .about-flow__steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border: var(--about-line);
  background: var(--metal);
}

.page-about .about-step {
  position: relative;
  padding: 18px 16px 16px;
  background: var(--ink-2);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-step__title {
  margin: 8px 0 8px;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-step__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist-2);
}

.page-about .about-step__more {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.22s ease, opacity 0.22s ease;
}

.page-about .about-step__more p {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--metal);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-step__more span {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 6px;
  border: 1px solid var(--flame);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--flame-2);
}

.page-about .about-flow__figure {
  margin: 28px 0 0;
}

/* ---------- 谁在用 ---------- */
.page-about .about-people {
  padding: var(--about-pad) 0;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  background: var(--ink-3);
}

.page-about .about-people__head {
  max-width: 48em;
}

.page-about .about-people__head h2 {
  margin: 10px 0 14px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-people__head p:last-child {
  margin: 0;
  color: var(--mist-2);
  line-height: 1.8;
}

.page-about .about-people__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-person {
  display: flex;
  flex-direction: column;
  padding: 20px 18px 18px;
  border: var(--about-line);
  border-left: 3px solid var(--flame-deep);
  background: var(--ink-2);
}

.page-about .about-person__tag {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-person h3 {
  margin: 0 0 10px;
  font-size: 18px;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-person > p {
  flex: 1 1 auto;
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-2);
}

.page-about .about-person__link {
  align-self: flex-start;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--flame);
  font-size: 14px;
  font-weight: 600;
  color: var(--flame-2);
  text-decoration: none;
}

.page-about .about-person__link:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-person__link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- 协作 ---------- */
.page-about .about-partner {
  padding: var(--about-pad) 0;
  background: linear-gradient(120deg, rgba(58, 90, 120, 0.28) 0%, rgba(21, 21, 21, 0) 60%), var(--ink);
}

.page-about .about-partner__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 44px);
  align-items: start;
}

.page-about .about-partner__main h2 {
  margin: 10px 0 16px;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .about-partner__main p {
  max-width: 42em;
  margin: 0 0 14px;
  color: var(--mist-2);
  line-height: 1.85;
}

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

.page-about .about-partner__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--amber);
  background: var(--ink-2);
}

.page-about .about-partner__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  border-bottom: var(--about-line);
}

.page-about .about-partner__k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist-3);
}

.page-about .about-partner__v {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(30px, 4.5vw, 56px) 0;
  border-top: var(--about-line);
  background: linear-gradient(100deg, var(--flame-deep) 0%, var(--flame) 52%, #8E2A08 100%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.page-about .about-cta__text h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.3;
  letter-spacing: 0.03em;
  color: #FFFFFF;
}

.page-about .about-cta__text p {
  max-width: 46em;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.36fr) minmax(0, 0.64fr);
    gap: clamp(24px, 3.5vw, 48px);
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
  }

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

  .page-about .about-flow__rail {
    display: block;
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin-top: 0;
    border-top: 0;
  }

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

  .page-about .about-partner__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 940px) {
  .page-about .about-archive__split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-archive__story {
    position: sticky;
    top: 24px;
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-about .about-step:hover .about-step__more,
  .page-about .about-step:focus-within .about-step__more {
    max-height: 9em;
    opacity: 1;
  }
}

@media (hover: none), (max-width: 859px) {
  .page-about .about-step__more {
    max-height: none;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-step__more {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>