.page-about {
  --tl-pad: 30px;
  --about-glow: rgba(242, 169, 59, 0.16);
  --about-line-soft: rgba(242, 169, 59, 0.30);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: 26px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -180px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, var(--about-glow), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-hero__text {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-hero .display {
  margin: 0;
  max-width: 18ch;
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 52ch;
  color: var(--paper);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__fact {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.04em;
  color: var(--amber-soft);
  background: rgba(242, 169, 59, 0.10);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-pill);
  padding: 7px 14px;
}

.page-about .about-hero__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  line-height: 1.6;
  color: var(--mist);
  align-self: end;
}

/* 从哪来 */
.page-about .about-origin__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-origin__text h2 {
  margin: 12px 0 18px;
}

.page-about .about-origin__text p {
  margin: 0 0 14px;
  max-width: 54ch;
}

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

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

/* 时间轴 */
.page-about .about-timeline__head {
  margin-bottom: 24px;
}

.page-about .about-timeline__head h2 {
  margin: 12px 0 10px;
}

.page-about .about-timeline__head .note {
  margin: 0;
  color: var(--mist);
  font-size: var(--fs-note);
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--amber), var(--line) 55%, transparent);
}

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

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 16px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 24px;
  left: calc(2px - var(--tl-pad));
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
}

.page-about .tl-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus-within {
  border-color: var(--about-line-soft);
  transform: translateY(-2px);
}

.page-about .tl-card > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-card > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 18px;
  line-height: 1;
}

.page-about .tl-card[open] > summary::after {
  content: "–";
}

.page-about .tl-card__year {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.06em;
  color: var(--amber);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.page-about .tl-card__title {
  margin: 0;
  font-size: 18px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .tl-card__body {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--mist);
}

/* 五步流程 */
.page-about .about-flow__head {
  margin-bottom: 20px;
}

.page-about .about-flow__head h2 {
  margin: 12px 0 10px;
}

.page-about .about-flow__head p {
  margin: 0;
  max-width: 52ch;
}

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

.page-about .about-flow__rail svg {
  display: block;
  width: 100%;
  height: 34px;
}

.page-about .about-flow__rail polyline {
  stroke: var(--line);
}

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

.page-about .flow-step {
  background: var(--panel-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .flow-step:hover,
.page-about .flow-step:focus-within {
  border-color: var(--amber);
  background: var(--panel);
  transform: translateY(-4px);
}

.page-about .flow-step__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--amber);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.page-about .flow-step__title {
  margin: 12px 0 8px;
  font-size: 18px;
  color: var(--paper);
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mis, var(--mist));
}

.page-about .flow-step__meta {
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: var(--fs-note);
}

.page-about .flow-step__role {
  font-family: var(--font-mono);
  color: var(--cyan);
  border: 1px solid rgba(56, 225, 214, 0.35);
  border-radius: var(--radius-pill);
  padding: 2px 9px;
}

.page-about .flow-step__time {
  font-family: var(--font-mono);
  color: var(--mist);
  padding: 2px 2px;
}

.page-about .about-flow__figure {
  margin: 22px 0 0;
  border: 1px solid var(--line);
}

/* 团队 */
.page-about .about-team__head {
  margin-bottom: 22px;
}

.page-about .about-team__head h2 {
  margin: 12px 0 10px;
}

.page-about .about-team__head p {
  margin: 0;
  max-width: 56ch;
}

.page-about .about-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .team-card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--amber);
}

.page-about .team-card__role {
  margin: 10px 0 8px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* 三条做法 */
.page-about .about-belief__head {
  margin-bottom: 20px;
}

.page-about .about-belief__head h2 {
  margin: 12px 0 0;
}

.page-about .about-belief__grid {
  display: grid;
  gap: 14px;
}

.page-about .belief {
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  padding: 18px;
}

.page-about .belief--amber {
  border-left-color: var(--amber);
}

.page-about .belief--cyan {
  border-left-color: var(--cyan);
}

.page-about .belief--coral {
  border-left-color: var(--coral);
}

.page-about .belief__title {
  margin: 0 0 10px;
  font-size: 20px;
  color: var(--paper);
}

.page-about .belief__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* 数据 */
.page-about .about-scale__panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--panel-3), var(--panel));
  padding: 24px 20px 26px;
}

.page-about .about-scale__bg {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  pointer-events: none;
}

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

.page-about .about-scale__head {
  position: relative;
  margin-bottom: 22px;
}

.page-about .about-scale__head h2 {
  margin: 12px 0 0;
}

.page-about .about-scale__grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 9vw, 50px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .stat-label {
  font-size: 15px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-scale__foot {
  position: relative;
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* 外部协作 */
.page-about .about-partner__grid {
  display: grid;
  gap: 24px;
}

.page-about .about-partner__main h2 {
  margin: 12px 0 16px;
}

.page-about .about-partner__main p {
  margin: 0 0 14px;
  max-width: 54ch;
}

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

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

.page-about .partner-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel-3);
  padding: 14px 16px;
}

.page-about .partner-item__key {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.04em;
  color: var(--cyan);
  border: 1px solid rgba(56, 225, 214, 0.35);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.page-about .partner-item__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* 下一步 */
.page-about .about-next h2 {
  margin: 0 0 18px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--amber);
  background: var(--panel-2);
  transform: translateY(-3px);
}

.page-about .next-card__label {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .next-card__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

/* 焦点可见 */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@media (min-width: 700px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-scale__panel {
    padding: 30px 28px 32px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 860px) {
  .page-about {
    --tl-pad: 44px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-partner__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 52px;
    align-items: start;
  }

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

  .page-about .belief:nth-child(2) {
    margin-top: 40px;
  }

  .page-about .about-flow__rail {
    display: block;
    margin-bottom: 12px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 32px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team-card:nth-child(even) {
    margin-top: 28px;
  }

  .page-about .about-team__grid {
    margin-bottom: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .flow-step,
  .page-about .next-card {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .flow-step:hover,
  .page-about .next-card:hover {
    transform: none;
  }
}
<<<END>>>

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