.page-about {
  --about-rail-width: 176px;
  --about-num-col: 88px;
  background: var(--mg-night);
  color: var(--mg-body-text);
  font-family: var(--mg-font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 1.75rem 0 3rem;
  background:
    radial-gradient(125% 90% at 84% 0%, rgba(58, 240, 210, 0.13), transparent 62%),
    linear-gradient(180deg, var(--mg-deep), var(--mg-night) 78%);
  border-bottom: 1px solid var(--mg-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(242, 245, 255, 0.055) 0 1px, transparent 1px 4px);
  opacity: 0.55;
  pointer-events: none;
  animation: about-scan 16s linear infinite alternate;
}

@keyframes about-scan {
  from { transform: translateY(0); }
  to { transform: translateY(6px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before { animation: none; }
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero__title {
  font-family: var(--mg-font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mg-ink);
  margin: 0.6rem 0 1rem;
  max-width: 17ch;
}

.page-about .about-hero__lead {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--mg-body-text);
  max-width: 54ch;
  margin: 0 0 1.5rem;
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.85rem;
  margin: 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--mg-line);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--mg-muted);
}

.page-about .about-hero__num {
  font-family: var(--mg-font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--mg-cyan);
  letter-spacing: 0.03em;
}

.page-about .about-hero__facts li:nth-child(2) .about-hero__num { color: var(--mg-orange); }
.page-about .about-hero__facts li:nth-child(3) .about-hero__num { color: var(--mg-violet); }

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

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  top: -14px;
  right: -12px;
  width: 62%;
  height: 52%;
  background: linear-gradient(135deg, rgba(255, 122, 47, 0.92), rgba(154, 107, 255, 0.55));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 20% 100%);
  z-index: 0;
}

.page-about .about-hero__media .mg-figure {
  position: relative;
  z-index: 1;
  margin: 0;
}

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

.page-about .mg-media__caption {
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--mg-muted);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 2rem;
  padding-top: 2rem;
  padding-bottom: 3.5rem;
}

/* ---------- 左侧章节栏 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--mg-line);
  border-bottom: 1px solid var(--mg-line);
  padding: 0.75rem 0;
}

.page-about .about-rail__label {
  font-family: var(--mg-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--mg-muted-dim);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.25rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
  color: var(--mg-body-text);
  text-decoration: none;
  border: 1px solid var(--mg-line);
  background: var(--mg-deep);
  transition: border-color 0.2s var(--mg-ease), color 0.2s var(--mg-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--mg-cyan);
  color: var(--mg-cyan);
}

.page-about .about-rail__num {
  font-family: var(--mg-font-mono);
  font-size: 0.78rem;
  color: var(--mg-orange);
}

/* ---------- 章节 ---------- */
.page-about .about-chapters {
  display: grid;
  gap: 3.25rem;
}

.page-about .about-chapter {
  scroll-margin-top: 96px;
  position: relative;
}

.page-about .about-chapter__num {
  display: block;
  margin-bottom: 0.4rem;
  line-height: 1;
}

.page-about .about-chapter__title {
  font-family: var(--mg-font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--mg-ink);
  margin: 0 0 1rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--mg-line-soft);
}

.page-about .about-chapter__body {
  margin-top: 0.25rem;
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  display: block;
  height: 1px;
  margin: 0 0 3.25rem;
  background: linear-gradient(90deg, var(--mg-line), transparent 72%);
}

.page-about .about-chapter + .about-chapter {
  margin-top: -3.25rem;
}

/* ---------- 归档矩阵图 ---------- */
.page-about .about-matrix {
  margin: 1.75rem 0 1.5rem;
  padding: 0.75rem;
  background: var(--mg-panel);
  border: 1px solid var(--mg-line);
  box-shadow: 6px 6px 0 rgba(154, 107, 255, 0.14);
}

/* ---------- 年代刻度切换 ---------- */
.page-about .about-era {
  position: relative;
  margin-top: 0.5rem;
  background: var(--mg-deep);
  border: 1px solid var(--mg-line);
}

.page-about .about-era__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  margin: 0;
  pointer-events: none;
}

.page-about .about-era__ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.75rem;
  border-bottom: 1px solid var(--mg-line);
}

.page-about .about-era__tick {
  font-family: var(--mg-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  padding: 0.4rem 0.75rem;
  color: var(--mg-muted);
  border: 1px solid var(--mg-line);
  cursor: pointer;
  transition: background 0.2s var(--mg-ease), color 0.2s var(--mg-ease), border-color 0.2s var(--mg-ease);
}

.page-about .about-era__tick:hover {
  color: var(--mg-cyan);
  border-color: var(--mg-cyan);
}

.page-about .about-era__radio:nth-of-type(1):checked ~ .about-era__ticks .about-era__tick:nth-of-type(1),
.page-about .about-era__radio:nth-of-type(2):checked ~ .about-era__ticks .about-era__tick:nth-of-type(2),
.page-about .about-era__radio:nth-of-type(3):checked ~ .about-era__ticks .about-era__tick:nth-of-type(3),
.page-about .about-era__radio:nth-of-type(4):checked ~ .about-era__ticks .about-era__tick:nth-of-type(4),
.page-about .about-era__radio:nth-of-type(5):checked ~ .about-era__ticks .about-era__tick:nth-of-type(5) {
  background: var(--mg-cyan);
  border-color: var(--mg-cyan);
  color: var(--mg-night);
  font-weight: 700;
}

.page-about .about-era__radio:nth-of-type(1):focus-visible ~ .about-era__ticks .about-era__tick:nth-of-type(1),
.page-about .about-era__radio:nth-of-type(2):focus-visible ~ .about-era__ticks .about-era__tick:nth-of-type(2),
.page-about .about-era__radio:nth-of-type(3):focus-visible ~ .about-era__ticks .about-era__tick:nth-of-type(3),
.page-about .about-era__radio:nth-of-type(4):focus-visible ~ .about-era__ticks .about-era__tick:nth-of-type(4),
.page-about .about-era__radio:nth-of-type(5):focus-visible ~ .about-era__ticks .about-era__tick:nth-of-type(5) {
  outline: 2px solid var(--mg-orange);
  outline-offset: 2px;
}

.page-about .about-era__panel {
  display: none;
  padding: 1.25rem;
  border-left: 3px solid var(--mg-violet);
}

.page-about .about-era__radio:nth-of-type(1):checked ~ .about-era__panels .about-era__panel:nth-child(1),
.page-about .about-era__radio:nth-of-type(2):checked ~ .about-era__panels .about-era__panel:nth-child(2),
.page-about .about-era__radio:nth-of-type(3):checked ~ .about-era__panels .about-era__panel:nth-child(3),
.page-about .about-era__radio:nth-of-type(4):checked ~ .about-era__panels .about-era__panel:nth-child(4),
.page-about .about-era__radio:nth-of-type(5):checked ~ .about-era__panels .about-era__panel:nth-child(5) {
  display: block;
  animation: about-fade 0.28s var(--mg-ease) both;
}

@keyframes about-fade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-about .about-era__title {
  font-family: var(--mg-font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--mg-ink);
  margin: 0 0 0.6rem;
}

.page-about .about-era__panel p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mg-body-text);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 0.75rem;
}

.page-about .about-team .mg-card {
  border-left: 3px solid var(--mg-cyan);
  background: linear-gradient(180deg, var(--mg-panel), var(--mg-deep));
  box-shadow: 5px 5px 0 rgba(58, 240, 210, 0.1);
  transition: transform 0.25s var(--mg-ease), box-shadow 0.25s var(--mg-ease);
}

.page-about .about-team .mg-card:nth-child(2) {
  border-left-color: var(--mg-orange);
  box-shadow: 5px 5px 0 rgba(255, 122, 47, 0.12);
}

.page-about .about-team .mg-card:nth-child(3) {
  border-left-color: var(--mg-violet);
  box-shadow: 5px 5px 0 rgba(154, 107, 255, 0.14);
}

.page-about .about-team .mg-card:hover,
.page-about .about-team .mg-card:focus {
  transform: translateY(-4px);
  box-shadow: 7px 9px 0 rgba(58, 240, 210, 0.16);
}

.page-about .about-team .mg-card__body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--mg-body-text);
}

.page-about .about-team__duties {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--mg-ease), opacity 0.3s var(--mg-ease), margin-top 0.3s var(--mg-ease);
}

.page-about .about-team .mg-card:hover .about-team__duties,
.page-about .about-team .mg-card:focus .about-team__duties,
.page-about .about-team .mg-card:focus-within .about-team__duties {
  max-height: 17rem;
  opacity: 1;
  margin-top: 0.9rem;
}

.page-about .about-team__duties li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.45rem;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mg-muted);
}

.page-about .about-team__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.5rem;
  height: 1px;
  background: var(--mg-cyan);
}

.page-about .about-team__hint {
  font-size: 0.8rem;
  color: var(--mg-muted-dim);
  margin: 0 0 1.75rem;
}

.page-about .about-craft {
  margin: 0 0 1.75rem;
  padding: 0.75rem;
  background: var(--mg-panel);
  border: 1px solid var(--mg-line);
  box-shadow: -6px 6px 0 rgba(255, 122, 47, 0.12);
}

@media (hover: none) {
  .page-about .about-team__duties {
    max-height: none;
    opacity: 1;
    margin-top: 0.9rem;
  }
  .page-about .about-team__hint { display: none; }
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  display: grid;
  gap: 1.25rem;
  margin: 1.75rem 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 1rem 0 0;
  border-top: 3px solid var(--mg-line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 30px;
  height: 3px;
  background: var(--mg-violet);
}

.page-about .about-timeline__item--now::before { background: var(--mg-orange); }
.page-about .about-timeline__item--now { border-top-color: var(--mg-orange); }

.page-about .about-timeline__year {
  font-family: var(--mg-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--mg-cyan);
  margin: 0 0 0.35rem;
}

.page-about .about-timeline__name {
  font-family: var(--mg-font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--mg-ink);
  margin: 0 0 0.45rem;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mg-muted);
}

/* ---------- 三件事 ---------- */
.page-about .about-pillars {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .about-pillar {
  position: relative;
  padding: 1.25rem 1.25rem 1.4rem;
  background: linear-gradient(180deg, var(--mg-panel), var(--mg-deep));
  border: 1px solid var(--mg-line);
  border-left: 3px solid var(--mg-cyan);
}

.page-about .about-pillar:nth-child(2) { border-left-color: var(--mg-orange); }
.page-about .about-pillar:nth-child(3) { border-left-color: var(--mg-violet); }

.page-about .about-pillar__num {
  font-family: var(--mg-font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: rgba(58, 240, 210, 0.35);
  margin: 0 0 0.35rem;
  line-height: 1;
}

.page-about .about-pillar:nth-child(2) .about-pillar__num { color: rgba(255, 122, 47, 0.38); }
.page-about .about-pillar:nth-child(3) .about-pillar__num { color: rgba(154, 107, 255, 0.45); }

.page-about .about-pillar__title {
  font-family: var(--mg-font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--mg-ink);
  margin: 0 0 0.6rem;
}

.page-about .about-pillar p:last-child {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--mg-body-text);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  position: relative;
  margin-top: 0.5rem;
  padding: 1.75rem 1.25rem 2rem;
  background: linear-gradient(135deg, var(--mg-deep) 0%, var(--mg-panel) 62%, rgba(154, 107, 255, 0.2) 100%);
  border: 1px solid var(--mg-line);
  overflow: hidden;
}

.page-about .about-next::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 88px;
  height: 88px;
  background: linear-gradient(135deg, transparent 50%, rgba(255, 122, 47, 0.85) 50%);
  pointer-events: none;
}

.page-about .about-next__title {
  font-family: var(--mg-font-display);
  font-size: clamp(1.3rem, 3.6vw, 1.8rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--mg-ink);
  margin: 0.5rem 0 0.85rem;
  max-width: 22ch;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mg-body-text);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.4rem;
}

.page-about .about-next a {
  text-decoration: none;
}

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

.page-about .mg-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--mg-ease), transform 0.5s var(--mg-ease);
}

.page-about .mg-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero { padding: 2.25rem 0 3.5rem; }
  .page-about .about-body { padding-top: 2.5rem; }
  .page-about .about-team { gap: 1.25rem; }
  .page-about .about-timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }
}

@media (min-width: 768px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: stretch;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    border: 0;
    padding: 0;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__list li { margin-bottom: 0.45rem; }

  .page-about .about-rail__link {
    display: flex;
    width: 100%;
    padding: 0.55rem 0.7rem;
    background: transparent;
  }

  .page-about .about-chapter {
    display: grid;
    grid-template-columns: var(--about-num-col) minmax(0, 1fr);
    column-gap: 1.75rem;
  }

  .page-about .about-chapter__num {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 104px;
    margin-bottom: 0;
  }

  .page-about .about-chapter__inner {
    grid-column: 2;
    grid-row: 1;
    min-width: 0;
  }

  .page-about .about-team { grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: start; }
  .page-about .about-team .mg-card:nth-child(2) { margin-top: 1.75rem; }
  .page-about .about-team .mg-card:nth-child(3) { margin-top: 0.75rem; }

  .page-about .about-pillars { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-pillar:nth-child(2) { margin-top: 1.25rem; }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 3rem;
    align-items: end;
  }

  .page-about .about-hero__media {
    transform: translateY(-1rem);
  }

  .page-about .about-timeline { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .about-next { padding: 2.25rem 2rem 2.5rem; }
}

@media (min-width: 1120px) {
  .page-about {
    --about-rail-width: 208px;
    --about-num-col: 104px;
  }

  .page-about .about-chapter__title { font-size: 2.1rem; }
  .page-about .about-matrix { padding: 1rem; }
}
<<<END>>>