.page-about {
  --about-aside-w: 300px;
  --about-gap: 40px;
  background: var(--c-red-deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  background:
    radial-gradient(1100px 520px at 12% -10%, var(--c-mist), transparent 68%),
    linear-gradient(180deg, rgba(10, 10, 12, 0.9) 0%, transparent 100%);
  border-bottom: var(--edge);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--c-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-grid) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.28;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  margin-top: 28px;
}

.page-about .about-hero__lead {
  max-width: 640px;
  margin: 20px 0 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--c-gray-soft);
}

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

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--c-grid);
  border: var(--edge);
}

.page-about .about-hero__stat {
  padding: 16px 18px;
  background: var(--c-ink);
}

.page-about .about-hero__stat dt {
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-gray);
}

.page-about .about-hero__stat dd {
  margin: 8px 0 0;
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-hero__stat dd .num {
  font-size: var(--fs-28);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: 56px;
  padding-bottom: 72px;
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  margin-bottom: 72px;
  padding-left: 18px;
  border-left: 4px solid var(--c-red);
}

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

.page-about .about-chapter__no {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--c-red);
}

.page-about .about-chapter .section-title {
  margin: 0 0 18px;
}

.page-about .about-chapter .prose + .prose {
  margin-top: 20px;
}

.page-about .about-chapter--last {
  border-left-color: var(--c-yellow);
}

/* ---------- 关键点行 ---------- */
.page-about .about-keyline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 26px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: var(--edge);
}

.page-about .about-keyline li {
  font-size: var(--fs-14);
  color: var(--c-gray-soft);
}

.page-about .about-keyline .num {
  margin-right: 6px;
  font-size: var(--fs-20);
  color: var(--c-red);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 72px;
}

.page-about .media-frame img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-figure--inset {
  margin-left: 18px;
  border-left: 4px solid var(--c-yellow);
  padding-left: 0;
}

/* ---------- 团队三段 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__item {
  position: relative;
  padding: 20px 20px 20px 74px;
  background: linear-gradient(135deg, rgba(200, 16, 46, 0.13), rgba(10, 10, 12, 0.6));
  border-left: 3px solid var(--c-red);
  border-bottom: var(--edge);
}

.page-about .about-crew__item:nth-child(2) {
  border-left-color: var(--c-yellow);
}

.page-about .about-crew__item:nth-child(3) {
  border-left-color: var(--c-green);
}

.page-about .about-crew__count {
  position: absolute;
  left: 18px;
  top: 18px;
  font-size: var(--fs-28);
  line-height: 1;
}

.page-about .about-crew__item .sub-title {
  margin: 0 0 8px;
}

.page-about .about-crew__item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-gray-soft);
}

/* ---------- 内联旁注 ---------- */
.page-about .about-note-inline {
  display: flex;
  gap: 14px;
  margin-top: 26px;
  padding: 18px 20px;
  background: rgba(31, 191, 107, 0.08);
  border: var(--edge);
}

.page-about .about-note-inline__mark {
  flex: 0 0 auto;
  width: 4px;
  align-self: stretch;
  background: var(--c-green);
}

.page-about .about-note-inline p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-gray-soft);
}

.page-about .about-note-inline .num {
  color: var(--c-green);
  font-weight: 600;
}

/* ---------- 四级联赛 ---------- */
.page-about .about-tiers {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  background: var(--c-grid);
  border: var(--edge);
}

.page-about .about-tier {
  padding: 18px 20px;
  background: var(--c-ink);
}

.page-about .about-tier p {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-gray-soft);
}

.page-about .about-tiers__tail {
  margin-top: 24px;
}

/* ---------- 覆盖带 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-coverage__text .btn {
  margin-top: 22px;
}

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

.page-about .about-coverage .num {
  color: var(--c-red);
  font-weight: 600;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  padding-bottom: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  border-bottom: var(--edge);
}

.page-about .about-timeline__item {
  flex: 0 0 248px;
  scroll-snap-align: start;
  position: relative;
  padding: 20px 18px 22px;
  background: linear-gradient(180deg, rgba(42, 46, 54, 0.5), rgba(10, 10, 12, 0.9));
  border-top: 3px solid var(--c-red);
}

.page-about .about-timeline__item:nth-child(2) {
  border-top-color: var(--c-yellow);
}

.page-about .about-timeline__item:nth-child(3) {
  border-top-color: var(--c-green);
}

.page-about .about-timeline__item:nth-child(4) {
  border-top-color: var(--c-cyan);
}

.page-about .about-timeline__year {
  display: block;
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--c-white);
}

.page-about .about-timeline__item:nth-child(2) .about-timeline__year {
  color: var(--c-yellow);
}

.page-about .about-timeline__item:nth-child(3) .about-timeline__year {
  color: var(--c-green);
}

.page-about .about-timeline__item:nth-child(4) .about-timeline__year {
  color: var(--c-cyan);
}

.page-about .about-timeline__item .sub-title {
  margin: 14px 0 10px;
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-gray-soft);
}

/* ---------- 荣誉 ---------- */
.page-about .about-honors {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: 28px 0;
}

.page-about .about-honor {
  padding-left: 16px;
  border-left: 3px solid var(--c-red);
}

.page-about .about-honor__mark {
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 12px;
  background: var(--c-red);
}

.page-about .about-honor__mark--yellow {
  background: var(--c-yellow);
}

.page-about .about-honor__mark--green {
  background: var(--c-green);
}

.page-about .about-honor__title {
  margin: 0 0 6px;
  font-size: var(--fs-16);
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-white);
}

.page-about .about-honor .caption {
  margin: 0;
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta__foot {
  margin: 20px 0 0;
  font-size: var(--fs-14);
  color: var(--c-gray);
}

.page-about .about-cta__foot .num {
  color: var(--c-gray-soft);
}

/* ---------- 右侧旁注栏 ---------- */
.page-about .about-aside {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-toc {
  padding: 20px;
  background: var(--c-ink);
  border: var(--edge);
  border-left: 4px solid var(--c-yellow);
}

.page-about .about-toc__title,
.page-about .about-notes__title {
  margin: 0 0 14px;
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-gray);
}

.page-about .about-toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.page-about .about-toc li {
  counter-increment: toc;
  border-top: var(--edge);
}

.page-about .about-toc li:first-child {
  border-top: none;
}

.page-about .about-toc a {
  display: block;
  padding: 10px 0 10px 34px;
  position: relative;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--c-gray-soft);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-toc a::before {
  content: counter(toc, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--c-gray);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--c-white);
  padding-left: 40px;
}

.page-about .about-toc a:hover::before,
.page-about .about-toc a:focus-visible::before {
  color: var(--c-yellow);
}

.page-about .about-notes {
  padding: 20px;
  background: var(--c-ink);
  border: var(--edge);
  border-left: 4px solid var(--c-red);
}

.page-about .about-notes__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-note {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  border-top: var(--edge);
  cursor: default;
}

.page-about .about-note:first-child {
  border-top: none;
  padding-top: 4px;
}

.page-about .about-note__num {
  font-size: var(--fs-20);
  font-weight: 600;
  line-height: 1.2;
}

.page-about .about-note__label {
  font-size: var(--fs-14);
  color: var(--c-gray);
}

.page-about .about-note__tip {
  position: absolute;
  left: 0;
  top: 100%;
  z-index: 3;
  width: min(260px, 100%);
  padding: 12px 14px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--c-gray-soft);
  background: var(--c-red-deep);
  border: var(--edge);
  border-left: 3px solid var(--c-yellow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.page-about .about-note:hover .about-note__tip,
.page-about .about-note:focus-within .about-note__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.page-about .about-aside__cta {
  padding: 20px;
  background: linear-gradient(135deg, rgba(200, 16, 46, 0.18), rgba(10, 10, 12, 0.7));
  border: var(--edge);
}

.page-about .about-aside__cta-text {
  margin: 0 0 14px;
  font-size: var(--fs-14);
  color: var(--c-gray-soft);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--c-grid);
  }

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

  .page-about .about-honors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    margin-top: 40px;
  }

  .page-about .about-body {
    grid-template-columns: minmax(0, 7fr) var(--about-aside-w);
    gap: 64px;
    padding-top: 80px;
    padding-bottom: 104px;
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--hdr-h-min) + 24px);
    align-self: start;
    max-height: calc(100vh - var(--hdr-h-min) - 48px);
    overflow-y: auto;
  }

  .page-about .about-chapter {
    padding-left: 64px;
    margin-bottom: 96px;
  }

  .page-about .about-chapter__no {
    position: absolute;
    left: 18px;
    top: 6px;
    margin-bottom: 0;
    font-size: var(--fs-14);
  }

  .page-about .about-figure {
    margin-bottom: 96px;
  }

  .page-about .about-figure--inset {
    margin-left: 64px;
    max-width: 900px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-timeline__item {
    flex: 0 0 268px;
  }

  .page-about .about-crew__item {
    padding: 24px 22px 24px 22px;
  }

  .page-about .about-crew__count {
    position: static;
    display: block;
    margin-bottom: 12px;
    font-size: var(--fs-28);
  }
}

@media (min-width: 1280px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .about-note__tip {
    transition: none;
  }

  .page-about .about-timeline {
    scroll-behavior: auto;
  }
}
<<<END>>>