.page-about {
  --about-rail: 22px;
  background: var(--bg);
  color: var(--fg);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: var(--sp-4) var(--sp-6);
  border-bottom: var(--bd-strong);
  background:
    linear-gradient(155deg, rgba(13, 31, 26, 0) 32%, rgba(16, 19, 18, .88) 100%),
    repeating-linear-gradient(0deg, rgba(31, 59, 51, .22) 0 1px, transparent 1px 92px),
    var(--ink-900);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
}

.page-about .about-hero__title {
  margin: var(--sp-2) 0 var(--sp-3);
  max-width: 18ch;
}

.page-about .about-hero__lede {
  max-width: 58ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: var(--bd);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--sp-3) var(--sp-2);
  background: var(--ink-800);
}

.page-about .about-hero__fact:nth-child(2) .about-hero__num,
.page-about .about-hero__fact:nth-child(3) .about-hero__num {
  color: var(--orange);
}

.page-about .about-hero__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.7rem, 7vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-hero__lbl {
  font-family: var(--font-index);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--fg-muted);
}

/* ---------- 区块标题 ---------- */
.page-about .about-head {
  border-left: var(--bd-strong);
  padding-left: var(--sp-3);
}

.page-about .about-head .yt-section-head__index {
  display: block;
  margin-bottom: var(--sp-1);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  background:
    linear-gradient(200deg, rgba(16, 19, 18, .9) 0%, rgba(13, 31, 26, .2) 55%),
    var(--ink-900);
}

.page-about .about-origin__split {
  display: grid;
  gap: var(--sp-5);
  margin-top: var(--sp-5);
}

.page-about .about-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--sp-4);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--edge) 45%, var(--edge) 100%);
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: var(--sp-4);
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--sp-4) + 0px);
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--orange);
  border: 2px solid var(--ink-900);
}

.page-about .about-track__item:nth-child(3)::before,
.page-about .about-track__item:nth-child(4)::before {
  background: var(--cyan);
}

.page-about .about-track__mark {
  display: inline-block;
  font-family: var(--font-index);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--amber);
  border-bottom: 1px dashed var(--edge);
  padding-bottom: 2px;
  margin-bottom: var(--sp-2);
}

.page-about .about-track__item .yt-h4 {
  margin: 0 0 var(--sp-1);
}

.page-about .about-track__item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--fg-muted);
  max-width: 46ch;
}

.page-about .about-origin__media {
  margin: 0;
  border: var(--bd-strong);
  box-shadow: var(--shadow-hard);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ink-900);
  border-top: var(--bd);
}

.page-about .about-team__lede {
  margin-top: var(--sp-4);
  max-width: 62ch;
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
}

.page-about .about-crew {
  border: var(--bd);
  background: var(--edge);
  gap: 1px;
  display: grid;
}

.page-about .about-crew .yt-accordion__item {
  background: var(--ink-800);
}

.page-about .about-crew__trigger {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  width: 100%;
  padding: var(--sp-3);
  background: none;
  border: 0;
  color: var(--fg-strong);
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .02em;
}

.page-about .about-crew__trigger:hover,
.page-about .about-crew__trigger:focus-visible {
  background: rgba(77, 255, 224, .07);
}

.page-about .about-crew__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: .95rem;
  color: var(--orange);
}

.page-about .about-crew__name {
  flex: 1 1 auto;
}

.page-about .about-crew .yt-acc-trigger__icon {
  font-family: var(--font-num);
  color: var(--cyan);
  font-size: 1.1rem;
}

.page-about .about-crew__panel {
  padding: 0 var(--sp-3) var(--sp-3) calc(var(--sp-3) + 30px);
}

.page-about .about-crew__panel p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .about-team__media {
  margin: 0;
  border: var(--bd);
}

/* ---------- 节奏 ---------- */
.page-about .about-quality {
  border-block: var(--bd-strong);
}

.page-about .about-quality__lede {
  margin-top: var(--sp-4);
  max-width: 60ch;
}

.page-about .about-quality__grid {
  margin-top: var(--sp-5);
  gap: var(--sp-3);
}

.page-about .about-quality__metric {
  border: var(--bd-strong);
  border-left: 6px solid var(--ink-900);
  background: rgba(255, 255, 255, .42);
  padding: var(--sp-3);
}

.page-about .about-quality__metric .yt-metric__value {
  display: block;
  margin-bottom: var(--sp-2);
  color: var(--ink-900);
}

.page-about .about-quality__metric .yt-metric__label {
  display: block;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--ink-800);
}

/* ---------- 区域专题 ---------- */
.page-about .about-region {
  background:
    linear-gradient(120deg, rgba(16, 19, 18, .95) 0%, rgba(13, 31, 26, .5) 60%, rgba(13, 31, 26, 0) 100%),
    var(--ink-800);
}

.page-about .about-region__split {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-5);
}

.page-about .about-region__card {
  margin: 0;
  border: var(--bd-strong);
  box-shadow: var(--shadow-hard);
}

.page-about .about-region__card--dark {
  background: var(--ink-900);
  color: var(--paper-dim);
}

.page-about .about-region__card--dark .yt-card__title {
  color: var(--fg-strong);
}

.page-about .about-region__card--dark .yt-card__body p {
  color: var(--fg-muted);
}

.page-about .about-region__list {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-1);
}

.page-about .about-region__list li {
  position: relative;
  padding-left: 18px;
  font-size: .9rem;
  line-height: 1.65;
  font-family: var(--font-index);
  color: var(--mist);
}

.page-about .about-region__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6em;
  width: 8px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-region__list--dark li::before {
  background: var(--cyan);
}

.page-about .about-region__media {
  margin: var(--sp-5) 0 0;
  border: var(--bd-strong);
  box-shadow: var(--shadow-hard);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  background: var(--ink-900);
  border-top: var(--bd);
}

.page-about .about-eco__lede {
  margin-top: var(--sp-4);
  max-width: 62ch;
}

.page-about .about-eco__grid {
  display: grid;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
}

.page-about .about-eco__card {
  position: relative;
  padding: var(--sp-4) var(--sp-3) var(--sp-3);
  background: var(--ink-800);
  border: var(--bd);
  border-top: var(--bd-strong);
}

.page-about .about-eco__card:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-eco__card:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-eco__num {
  position: absolute;
  top: calc(-1 * var(--sp-3));
  left: var(--sp-3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--orange);
  color: var(--ink-900);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: .85rem;
  border: 2px solid var(--ink-900);
}

.page-about .about-eco__card .yt-h4 {
  margin: 0 0 var(--sp-2);
  color: var(--fg-strong);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .about-eco__next {
  margin-top: var(--sp-5);
  padding: var(--sp-4) var(--sp-3);
  border: var(--bd-strong);
  border-left: 6px solid var(--cyan);
  background: rgba(77, 255, 224, .05);
}

.page-about .about-eco__next-title {
  margin: 0 0 var(--sp-2);
  color: var(--cyan);
  font-family: var(--font-index);
  font-size: .82rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.page-about .about-eco__next p {
  margin: 0;
  max-width: 68ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--fg);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  background:
    linear-gradient(135deg, rgba(255, 138, 61, .1) 0%, rgba(13, 31, 26, 0) 55%),
    var(--ink-800);
  border-top: var(--bd-strong);
}

.page-about .about-outro__inner {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-outro__title {
  margin: 0;
  max-width: 22ch;
}

.page-about .about-outro__text {
  margin: 0;
  max-width: 62ch;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--fg-muted);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
  margin-top: var(--sp-2);
}

/* ---------- 图片通用 ---------- */
.page-about .yt-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-block: var(--sp-5) var(--sp-6);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--sp-5);
    align-items: end;
  }

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

  .page-about .about-origin__split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-origin__media {
    margin-top: var(--sp-5);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--sp-5);
    align-items: start;
  }

  .page-about .about-team__media {
    margin-top: var(--sp-4);
  }

  .page-about .about-region__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--sp-5);
  }

  .page-about .about-outro__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: center;
  }

  .page-about .about-outro__title,
  .page-about .about-outro__text,
  .page-about .about-outro__inner > .yt-eyebrow {
    grid-column: 1;
  }

  .page-about .about-outro__actions {
    grid-column: 2;
    grid-row: 1 / span 3;
    flex-direction: column;
    align-items: stretch;
    margin-top: 0;
  }
}

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

  .page-about .about-crew__trigger {
    transition: none;
  }
}
<<<END>>>