.page-about {
  --about-pad: clamp(44px, 7vw, 92px);
  --about-cut: 16px;
  background: var(--cold);
  color: var(--ink);
}

/* ---------- 顶部阅读进度 ---------- */
.page-about .scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 45;
  background: rgba(11, 59, 46, .16);
  pointer-events: none;
}

.page-about .scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--neon), var(--flood));
  transition: width 90ms linear;
}

/* ---------- 页头 ---------- */
.page-about .page-head {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 62px) 0 clamp(34px, 6vw, 78px);
  color: var(--cold);
  background:
    radial-gradient(130% 120% at 88% -30%, rgba(255, 201, 60, .26), transparent 58%),
    linear-gradient(158deg, var(--pitch-deep) 0%, #0d4c3a 52%, var(--pitch-mid) 100%);
}

.page-about .page-head::after {
  content: "";
  position: absolute;
  inset: auto -6% -34% 42%;
  height: 76%;
  background: repeating-linear-gradient(112deg, rgba(124, 255, 155, .22) 0 1px, transparent 1px 16px);
  transform: skewY(-4deg);
  pointer-events: none;
  opacity: .7;
}

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

.page-about .page-head .breadcrumb__link {
  color: var(--flood);
}

.page-about .page-head .breadcrumb__item {
  color: rgba(244, 247, 245, .68);
}

.page-about .page-head__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 5vw, 54px);
  line-height: 1.16;
  letter-spacing: -.02em;
  margin: 18px 0 16px;
  max-width: 21ch;
}

.page-about .page-head__desc {
  max-width: 70ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: rgba(244, 247, 245, .86);
}

/* ---------- 开篇夜景 ---------- */
.page-about .about-hero {
  position: relative;
  margin: 0;
  background: var(--stand);
  line-height: 0;
}

.page-about .about-hero img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1440 / 560;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 34, 51, .46) 0%, rgba(14, 34, 51, .05) 42%, rgba(11, 59, 46, .62) 100%);
  pointer-events: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
}

.page-about .about-section--plain {
  background: var(--cold);
}

.page-about .about-section--mist {
  background: var(--mist);
}

.page-about .about-section--dark {
  background: linear-gradient(180deg, var(--pitch-deep) 0%, #0a3328 100%);
  color: var(--cold);
}

.page-about .about-section--deep {
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(20, 98, 74, .55), transparent 62%),
    var(--pitch-deep);
  color: var(--cold);
}

.page-about .about-section--close {
  background: var(--stand);
  color: var(--cold);
}

.page-about .about-section p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.82;
}

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

.page-about .about-section .lede {
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.78;
  color: inherit;
}

.page-about .eyebrow {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--pitch-mid);
  margin: 0 0 12px;
}

.page-about .about-section--dark .eyebrow,
.page-about .about-section--deep .eyebrow,
.page-about .about-section--close .eyebrow {
  color: var(--flood);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -.015em;
  margin: 0 0 16px;
  color: var(--ink);
}

.page-about .about-section--dark .section-title,
.page-about .about-section--deep .section-title,
.page-about .about-section--close .section-title {
  color: var(--cold);
}

.page-about .about-section--dark p,
.page-about .about-section--deep p,
.page-about .about-section--close p {
  color: rgba(244, 247, 245, .84);
}

.page-about .section__head {
  max-width: 76ch;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

/* ---------- 主张的由来 ---------- */
.page-about .about-origin {
  display: grid;
  gap: 30px;
}

.page-about .about-origin__body {
  max-width: 74ch;
}

.page-about .about-claim {
  position: relative;
  padding: 26px 24px 24px;
  color: var(--cold);
  background: linear-gradient(150deg, var(--pitch-mid) 0%, var(--pitch-deep) 100%);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-claim::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  width: 46px;
  height: 3px;
  background: var(--flood);
}

.page-about .about-claim__mark {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 31px);
  line-height: 1.28;
  letter-spacing: .01em;
  color: var(--flood);
  margin: 10px 0 14px;
}

.page-about .about-claim__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 245, .82);
}

@media (min-width: 920px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }
}

/* ---------- 三种常客 ---------- */
.page-about .about-seats {
  display: grid;
  gap: 16px;
}

.page-about .seat {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--cold);
  border-top: 3px solid var(--flood);
  border-right: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  border-left: 1px solid var(--line-light);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .seat:hover,
.page-about .seat:focus-within {
  transform: translateY(-2px);
  background: #ffffff;
  border-color: var(--pitch-mid);
}

.page-about .seat__no {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--flood);
  margin: 0 0 12px;
}

.page-about .seat__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.35;
  letter-spacing: .01em;
  color: var(--pitch-deep);
  margin: 0 0 10px;
}

.page-about .seat__text {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink);
  margin: 0 0 18px;
}

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

.page-about .seat__link .btn {
  width: 100%;
  justify-content: center;
}

@media (min-width: 820px) {
  .page-about .about-seats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .seat__link .btn {
    width: auto;
  }
}

/* ---------- 两支队伍 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 30px;
}

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

.page-about .about-crerew__fig,
.page-about .about-crew .fig__cap {
  color: rgba(244, 247, 245, .62);
}

.page-about .about-crew__cards {
  display: grid;
  gap: 16px;
}

.page-about .crew-card {
  padding: 22px 20px 20px;
  background: rgba(244, 247, 245, .05);
  border: 1px solid var(--line-dark);
  border-left: 3px solid var(--flood);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-within {
  background: rgba(124, 255, 155, .09);
}

.page-about .crew-card__no {
  font-family: var(--font-num);
  font-size: clamp(27px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--flood);
  margin: 0 0 8px;
}

.page-about .crew-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--cold);
  margin: 0 0 10px;
}

.page-about .crew-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 247, 245, .84);
}

@media (min-width: 640px) {
  .page-about .about-crew__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .crew-card--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-crew {
    grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-crew__fig {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-road {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-road__item {
  position: relative;
  padding: 0 0 30px 30px;
  border-left: 1px solid rgba(124, 255, 155, .3);
}

.page-about .about-road__item:first-child {
  padding-top: 4px;
}

.page-about .about-road__item:last-child {
  padding-bottom: 0;
}

.page-about .about-road__dot {
  position: absolute;
  left: -6px;
  top: 14px;
  width: 11px;
  height: 11px;
  background: var(--flood);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-road__item:first-child .about-road__dot {
  top: 16px;
}

.page-about .about-road__item:hover .about-road__dot,
.page-about .about-road__item:focus-within .about-road__dot {
  transform: rotate(45deg) scale(1.35);
  box-shadow: 0 0 0 5px rgba(255, 201, 60, .2);
}

.page-about .about-road__stage {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--flood);
  margin: 0 0 6px;
}

.page-about .about-road__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.34;
  letter-spacing: .01em;
  color: var(--cold);
  margin: 0 0 12px;
}

.page-about .road-toggle {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  background: transparent;
  border: 1px solid var(--line-dark);
  color: var(--neon);
  font-family: var(--font-sans);
  font-size: 13.5px;
  letter-spacing: .05em;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .road-toggle:hover,
.page-about .road-toggle:focus-visible {
  background: rgba(124, 255, 155, .12);
  border-color: var(--neon);
  color: var(--cold);
}

.page-about .road-panel {
  margin-top: 14px;
  padding: 16px 18px;
  background: rgba(244, 247, 245, .05);
  border-left: 2px solid var(--neon);
}

.page-about .road-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 245, .82);
}

@media (min-width: 1024px) {
  .page-about .about-road {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 24px;
    margin-top: 52px;
  }

  .page-about .about-road__item,
  .page-about .about-road__item:first-child {
    padding: 30px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(124, 255, 155, .3);
  }

  .page-about .about-road__item:last-child {
    padding-bottom: 0;
  }

  .page-about .about-road__dot,
  .page-about .about-road__item:first-child .about-road__dot {
    left: 0;
    top: -6px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-collab {
  display: grid;
  gap: 30px;
}

.page-about .about-collab__body {
  max-width: 74ch;
}

.page-about .about-collab .fig {
  margin: 0;
}

.page-about .collab-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .collab-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: rgba(244, 247, 245, .62);
  border-left: 3px solid var(--slate);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .collab-item:hover,
.page-about .collab-item:focus-within {
  background: rgba(124, 255, 155, .3);
  border-left-color: var(--pitch-mid);
}

.page-about .collab-item__no {
  font-family: var(--font-num);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--pitch-mid);
}

.page-about .collab-item__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
  margin: 0 0 6px;
}

.page-about .collab-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: #2c3f36;
}

@media (min-width: 900px) {
  .page-about .about-collab {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-collab__fig {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  max-width: 860px;
}

.page-about .about-close .section-title {
  position: relative;
  padding-top: 18px;
}

.page-about .about-close .section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), var(--flood));
}

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

.page-about .about-actions .btn {
  min-width: 132px;
  justify-content: center;
}

/* ---------- 入场 ---------- */
.reveal-ready .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

.reveal-ready .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal-ready .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .seat,
  .page-about .about-road__dot,
  .page-about .collab-item,
  .page-about .crew-card {
    transition: none;
  }
}

/* ---------- 窄屏适配 ---------- */
@media (max-width: 640px) {
  .page-about .about-hero img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-claim {
    padding: 22px 18px 20px;
  }

  .page-about .collab-item {
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 10px;
    padding: 14px 14px;
  }

  .page-about .about-actions .btn {
    width: 100%;
  }
}
<<<END>>>