.page-about {
  --about-radius: 6px;
  --about-line: rgba(34, 211, 238, 0.22);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .section {
  scroll-margin-top: 84px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 12vw, 132px) 0 clamp(52px, 9vw, 104px);
  border-bottom: 1px solid var(--line);
  margin-top: var(--gutter);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 6, 14, 0.35) 0%, rgba(7, 6, 14, 0.86) 58%, var(--ink) 100%),
    radial-gradient(110% 85% at 8% 0%, rgba(124, 58, 237, 0.48), transparent 62%),
    radial-gradient(90% 70% at 96% 12%, rgba(34, 211, 238, 0.2), transparent 66%);
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 32em;
  font-size: clamp(15px, 1.9vw, 19px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__readout {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-hero__readout span {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.04em;
  color: var(--gold);
  border: 1px solid rgba(255, 201, 74, 0.32);
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(255, 201, 74, 0.06);
}

/* ---------- 章节导航 ---------- */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(7, 6, 14, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-toc__inner {
  overflow-x: auto;
  scrollbar-width: none;
  padding-top: 10px;
  padding-bottom: 10px;
}

.page-about .about-toc__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  white-space: nowrap;
}

.page-about .about-toc__list a {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: var(--step-2);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--paper);
  border-color: var(--blue);
  background: rgba(34, 211, 238, 0.1);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin__text h2 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .about-origin__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--purple);
  background: rgba(124, 58, 237, 0.08);
  color: var(--muted);
  font-size: var(--step-2);
  line-height: 1.8;
}

.page-about .about-origin__note .mono {
  color: var(--gold);
}

.page-about .about-origin__figure {
  position: relative;
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .about-origin__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-origin__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 14px 10px;
  font-size: var(--step-1);
  letter-spacing: 0.04em;
  color: var(--gold);
  background: linear-gradient(180deg, transparent, rgba(7, 6, 14, 0.92));
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__head .lead {
  max-width: 34em;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 24px 0 34px;
  padding: 0;
}

.page-about .about-jump a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.04em;
  color: var(--blue);
  border: 1px solid rgba(34, 211, 238, 0.35);
  border-radius: 4px;
  padding: 5px 10px;
  text-decoration: none;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: var(--blue);
  color: var(--ink);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--blue), var(--purple) 50%, var(--orange));
  opacity: 0.6;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 32px 38px;
  scroll-margin-top: 88px;
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 2px solid var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 26, 0.1);
}

.page-about .about-tl__item:first-child::before {
  background: var(--orange);
}

.page-about .about-tl__meta {
  margin: 0 0 6px;
  font-size: var(--step-1);
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-tl__ver {
  color: var(--blue);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-tl__body {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
  font-size: var(--step-3);
  line-height: 1.8;
}

/* ---------- 维护团队 ---------- */
.page-about .about-crew__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-crew__figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .about-crew__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-crew__body h2 {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .about-crew__units {
  display: grid;
  gap: 20px;
  margin-top: 26px;
}

.page-about .about-crew__unit {
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-crew__label {
  margin: 0 0 8px;
  font-size: var(--step-1);
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .about-crew__text {
  margin: 0;
  color: var(--muted);
  font-size: var(--step-2);
  line-height: 1.85;
}

.page-about .about-crew__rhythm {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-radius: var(--about-radius);
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--paper);
  font-size: var(--step-2);
  line-height: 1.85;
}

/* ---------- 标签墙 ---------- */
.page-about .about-tags__head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-tags__head .lead {
  max-width: 34em;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-tags__tabs {
  margin-top: 30px;
}

.page-about .about-tags__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-tags__chip {
  font-family: var(--font-body);
  font-size: var(--step-2);
  line-height: 1.4;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tags__chip:hover {
  color: var(--paper);
  border-color: var(--blue);
}

.page-about .about-tags__chip[aria-selected="true"] {
  background: var(--purple);
  border-color: var(--purple);
  color: #FFFFFF;
}

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

.page-about .about-tags__panels {
  margin-top: 24px;
  min-height: 84px;
}

.page-about .about-tags__panel {
  padding: 6px 0 6px 18px;
  border-left: 2px solid var(--purple);
}

.page-about .about-tags__panel p {
  margin: 0;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 三件事 ---------- */
.page-about .about-promise h2 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-promise__list {
  margin-top: 30px;
}

.page-about .about-promise__item {
  display: grid;
  gap: 6px;
  padding: 26px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-promise__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-promise__num {
  margin: 0;
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-promise__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-promise__item p {
  margin: 0;
  color: var(--muted);
  font-size: var(--step-2);
  line-height: 1.85;
}

/* ---------- 结尾 ---------- */
.page-about .about-next__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 6vw, 56px);
  border-radius: 10px;
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(124, 58, 237, 0.35), transparent 62%),
    radial-gradient(120% 140% at 100% 100%, rgba(34, 211, 238, 0.18), transparent 62%),
    var(--ink-2);
}

.page-about .about-next__panel::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(34, 211, 238, 0.16);
  border-radius: 6px;
  pointer-events: none;
}

.page-about .about-next__panel h2 {
  position: relative;
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-next__text {
  position: relative;
  margin: 0 0 28px;
  max-width: 36em;
  color: var(--muted);
  font-size: var(--step-3);
  line-height: 1.85;
}

.page-about .about-next__panel .btn-row {
  position: relative;
}

/* ---------- 宽度适配 ---------- */
@media (min-width: 600px) {
  .page-about .about-crew__units {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 760px) {
  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 28px;
    padding-left: 44px;
    padding-bottom: 38px;
  }

  .page-about .about-tl__item::before {
    top: 2px;
  }

  .page-about .about-tl__meta {
    margin-bottom: 0;
    padding-top: 5px;
  }

  .page-about .about-tl__title {
    font-size: var(--step-5);
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-crew__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-promise__item {
    grid-template-columns: 64px 250px minmax(0, 1fr);
    column-gap: 28px;
    align-items: baseline;
    padding: 34px 0;
  }

  .page-about .about-promise__num {
    padding-top: 6px;
  }

  .page-about .about-promise__item p {
    max-width: 44em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .about-jump a,
  .page-about .about-tags__chip {
    transition: none;
  }
}
<<<END>>>