.page-about {
  --about-dark: var(--blue-2);
  --about-dark-2: #071a34;
  --about-track-line: rgba(247, 245, 240, .22);
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  margin: 22px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 7vw, 88px);
  isolation: isolate;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(90% 70% at 92% 4%, rgba(239, 90, 12, .15), transparent 62%),
    linear-gradient(180deg, var(--snow-2), var(--snow));
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--orange);
  letter-spacing: .16em;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 15ch;
  letter-spacing: -.02em;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 52ch;
  color: var(--ink-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  left: -10px;
  bottom: -10px;
  width: 46%;
  height: 46%;
  border-left: 3px solid var(--orange);
  border-bottom: 3px solid var(--orange);
  pointer-events: none;
}

.page-about .about-hero__figure .figure__media {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--sand), var(--sand-2));
}

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

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding-block: clamp(48px, 7vw, 92px);
  background: var(--snow-2);
  border-top: 1px solid var(--line);
}

.page-about .about-origin__head {
  max-width: 62ch;
}

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

.page-about .about-origin__prose p {
  margin: 0 0 1.1em;
}

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

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

.page-about .about-origin__aside .panel {
  border-left: 4px solid var(--orange);
}

.page-about .panel__code {
  letter-spacing: .18em;
  color: var(--blue-3);
  font-size: .78rem;
}

.page-about .about-origin__panel-title {
  margin: 0 0 14px;
  font-weight: 600;
  color: var(--ink);
}

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

.page-about .about-steps li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  background: var(--snow);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--ink-2);
}

.page-about .about-origin__panel-note {
  margin: 14px 0 0;
  font-size: .86rem;
  color: var(--ink-2);
}

.page-about .about-origin__figure {
  margin: clamp(28px, 5vw, 56px) 0 0;
}

.page-about .about-origin__figure .figure__media {
  aspect-ratio: 21 / 9;
  overflow: hidden;
  border-radius: var(--r-md);
}

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

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  padding-block: clamp(52px, 8vw, 100px);
  background: linear-gradient(165deg, var(--about-dark) 0%, var(--about-dark-2) 100%);
  color: var(--snow);
  position: relative;
  overflow: hidden;
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 120px;
  background: repeating-linear-gradient(
    100deg,
    transparent 0 38px,
    rgba(247, 245, 240, .05) 38px 39px
  );
  pointer-events: none;
}

.page-about .about-milestones .section-head__eyebrow {
  color: var(--orange-2);
}

.page-about .about-milestones .section-head__title {
  color: var(--snow);
}

.page-about .about-milestones .section-head__note {
  color: var(--on-dark);
}

.page-about .about-milestones__head {
  max-width: 64ch;
}

.page-about .about-track {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  position: relative;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 28px 26px;
  border-left: 1px solid var(--about-track-line);
}

.page-about .about-track__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-track__step {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--orange-2);
  font-size: .82rem;
  letter-spacing: .12em;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(239, 90, 12, .22);
}

.page-about .about-track__title {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-track__text {
  margin: 0;
  max-width: 46ch;
  color: var(--on-dark);
  line-height: 1.75;
}

.page-about .about-numbers {
  margin-top: clamp(36px, 6vw, 64px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-track-line);
  border: 1px solid var(--about-track-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-number {
  background: rgba(7, 26, 52, .82);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-number__value {
  margin: 0;
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  line-height: 1;
  font-weight: 600;
  color: var(--orange-2);
  letter-spacing: -.02em;
}

.page-about .about-number__label {
  margin: 12px 0 6px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-number__note {
  margin: 0;
  font-size: .88rem;
  color: var(--on-dark-dim);
  line-height: 1.6;
}

/* ---------- 使用场景 ---------- */
.page-about .about-audience {
  padding-block: clamp(48px, 7vw, 92px);
}

.page-about .about-audience__head {
  max-width: 62ch;
}

.page-about .about-tabs {
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .tab {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--snow);
  color: var(--ink-2);
  font: inherit;
  font-size: .95rem;
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .tab:hover {
  border-color: var(--line-strong);
  color: var(--ink);
}

.page-about .tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--snow);
}

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

.page-about .about-panel {
  padding-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-panel:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 6px;
}

.page-about .about-panel__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.5vw, 40px);
  align-items: start;
}

.page-about .about-panel__prose p {
  margin: 0 0 1em;
  max-width: 52ch;
}

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

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

.page-about .about-panel__list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--sand);
  border-radius: var(--r-sm);
  color: var(--ink);
  line-height: 1.6;
  font-size: .95rem;
  box-shadow: var(--shadow-1);
}

.page-about .about-panel__list .tag {
  flex: 0 0 auto;
  margin-top: 2px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(48px, 7vw, 92px);
  background: var(--snow-2);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
  background: var(--snow);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(24px, 4vw, 48px);
  box-shadow: var(--shadow-2);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 12px;
  color: var(--orange);
  letter-spacing: .16em;
}

.page-about .about-cta__title {
  margin: 0 0 16px;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  max-width: 48ch;
  color: var(--ink-2);
  line-height: 1.8;
}

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

.page-about .about-cta__note {
  margin: 20px 0 0;
  font-size: .88rem;
  color: var(--ink-2);
  line-height: 1.7;
}

.page-about .about-cta__note .mono {
  color: var(--blue);
  white-space: nowrap;
}

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

.page-about .about-cta__figure .figure__media {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--r-md);
  background: linear-gradient(180deg, var(--blue-3), var(--blue-2));
}

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

/* ---------- 窄屏保护 ---------- */
@media (max-width: 599px) {
  .page-about .about-hero__figure::after {
    display: none;
  }

  .page-about .about-panel__list li {
    flex-direction: column;
    gap: 8px;
  }

  .page-about .about-cta__note .mono {
    white-space: normal;
    word-break: break-all;
  }
}

/* ---------- 中屏及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-panel__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .75fr);
  }

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

  .page-about .about-track {
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(20px, 3vw, 34px);
  }

  .page-about .about-track__item {
    padding: 26px 0 0 0;
    border-left: 0;
    border-top: 1px solid var(--about-track-line);
  }

  .page-about .about-track__item:last-child {
    border-top-color: var(--about-track-line);
  }

  .page-about .about-track__item::before {
    left: 0;
    top: -5px;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }
}
<<<END>>>