.page-about {
  --about-gap: 44px;
  background: var(--deep);
  color: var(--ice);
  overflow-x: clip;
  padding-bottom: 72px;
}

.page-about .breadcrumb {
  padding: 18px 0 0;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--grid-line);
}

/* ---------- 首屏 ---------- */
.about-head {
  padding: 22px 0 4px;
}

.about-head__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.about-head__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 64px);
  line-height: 1.03;
  letter-spacing: -0.01em;
}

.about-head__title::after {
  content: "";
  display: block;
  width: 88px;
  height: 6px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--orange), var(--orange-soft));
  transform: skewX(-24deg);
}

.about-head__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #C3D0EA;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 26px 0 8px;
}

.about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 13px 12px 14px;
  background: var(--blueprint);
  border: 2px solid var(--grid-line);
  border-left: 4px solid var(--orange);
}

.about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 7vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.about-stats__plus {
  margin-left: 2px;
  font-size: 0.55em;
  color: var(--orange);
}

.about-stats__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .section {
  margin-top: 46px;
}

.about-timeline .section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--grid-line);
}

.about-timeline .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 800;
  font-size: clamp(20px, 4.8vw, 30px);
  line-height: 1.15;
}

.about-timeline .section__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.tl {
  position: relative;
  margin: 28px 0 0;
  padding: 0 8px 0 var(--about-gap);
  list-style: none;
}

.tl::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 6px;
  border-left: 2px dashed var(--grid-line);
}

.tl__item {
  position: relative;
  margin-bottom: 28px;
}

.tl__node {
  position: absolute;
  left: -44px;
  top: 0;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: var(--orange);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  border-radius: 2px;
  box-shadow: 3px 3px 0 rgba(4, 9, 20, 0.85);
  z-index: 2;
}

.tl__body {
  position: relative;
  padding: 18px 16px 20px;
  background: var(--blueprint);
  border: 2px solid var(--grid-line);
  border-left: 4px solid var(--orange);
  box-shadow: 5px 5px 0 rgba(4, 9, 20, 0.85);
}

.tl__body::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 18px solid var(--orange);
  border-left: 18px solid transparent;
  opacity: 0.9;
}

.tl__body::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 13px;
  width: 18px;
  border-top: 2px dashed var(--grid-line);
}

.tl__stage {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.tl__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 800;
  font-size: clamp(20px, 5vw, 28px);
  line-height: 1.16;
  color: var(--ice);
}

.tl__text {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.78;
  color: #C3D0EA;
}

.tl__points {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.tl__points li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.68;
  color: #B7C5E1;
}

.tl__points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.tl__more {
  margin: 0 0 14px;
  padding: 9px 12px;
  border: 1px dashed var(--grid-line);
  background: rgba(8, 17, 38, 0.6);
}

.tl__more summary {
  cursor: pointer;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--cyan);
  list-style: none;
}

.tl__more summary::-webkit-details-marker {
  display: none;
}

.tl__more summary::before {
  content: "+ ";
  font-family: var(--font-mono);
  color: var(--orange);
}

.tl__more[open] summary::before {
  content: "− ";
}

.tl__more summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.tl__more ul {
  margin: 10px 0 2px;
  padding-left: 18px;
  display: grid;
  gap: 7px;
  color: #B7C5E1;
  font-size: 14px;
  line-height: 1.65;
}

/* ---------- 章节内图 ---------- */
.about-evo {
  margin: 4px 0 16px;
}

.about-evo img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--grid-line);
}

.about-evo figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 团队与节奏 ---------- */
.about-team {
  display: grid;
  gap: 16px;
  margin: 6px 0 18px;
}

.about-team img,
.about-rhythm img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--grid-line);
}

.roster {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.roster li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--grid-line);
}

.roster__num {
  flex: 0 0 auto;
  min-width: 2.2ch;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.roster__role {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ice);
  line-height: 1.5;
}

.roster__role em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-weight: 400;
  font-size: 13px;
  color: var(--mist);
}

.about-rhythm {
  display: grid;
  gap: 14px;
  margin-top: 6px;
  padding-top: 16px;
  border-top: 2px solid var(--grid-line);
}

.about-rhythm__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 800;
  font-size: 18px;
  color: var(--cyan);
}

.tl__end {
  margin: 26px 0 0;
  padding-left: var(--about-gap);
}

/* ---------- 收尾入口 ---------- */
.about-next {
  padding: 20px 16px 22px;
  background: var(--blueprint);
  border: 2px solid var(--grid-line);
  box-shadow: 5px 5px 0 rgba(4, 9, 20, 0.85);
}

.about-next__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 800;
  font-size: clamp(20px, 4.8vw, 28px);
  color: var(--ice);
}

.about-next__lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.about-next__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.about-next__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 12px 14px;
  border: 2px solid var(--grid-line);
  color: var(--ice);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.about-next__list a:hover,
.about-next__list a:focus-visible {
  border-color: var(--orange);
  background: rgba(255, 106, 26, 0.08);
  transform: translateX(4px);
}

.about-next__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .about-head__lead {
    font-size: 17px;
  }

  .tl__body {
    padding: 22px 24px 24px;
  }

  .about-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: 20px;
  }

  .about-rhythm {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 20px;
  }

  .about-next {
    padding: 26px 24px 28px;
  }

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

@media (min-width: 960px) {
  .page-about {
    --about-gap: 64px;
  }

  .tl {
    padding: 0 20px 0 var(--about-gap);
  }

  .tl::before {
    left: 23px;
  }

  .tl__node {
    left: -57px;
    top: 2px;
    width: 34px;
    height: 34px;
    font-size: 13px;
    box-shadow: 4px 4px 0 rgba(4, 9, 20, 0.85);
  }

  .tl__body::before {
    left: -24px;
    width: 24px;
  }

  .tl__item:nth-child(even) .tl__body {
    margin-left: 40px;
    border-left-color: var(--cyan);
  }

  .tl__item:nth-child(even) .tl__body::before {
    left: -64px;
    width: 64px;
  }

  .tl__item:nth-child(even) .tl__body::after {
    border-top-color: var(--cyan);
    border-left-width: 22px;
    border-top-width: 22px;
  }

  .tl__body {
    box-shadow: var(--shadow-hard);
    max-width: 76ch;
  }

  .about-head {
    padding-top: 34px;
  }

  .about-evo {
    margin: 6px 0 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-next__list a {
    transition: none;
  }

  .about-next__list a:hover,
  .about-next__list a:focus-visible {
    transform: none;
  }
}
<<<END>>>