.page-about {
  --about-yellow: var(--yellow);
  --about-rule: rgba(255, 210, 74, 0.34);
  --about-rail-max: min(78vw, 320px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(152deg, var(--ink-2) 0%, var(--ink) 56%, var(--ink-3) 100%);
  border-bottom: var(--edge);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(136deg, transparent 60%, rgba(255, 210, 74, 0.13) 60.1%, rgba(255, 210, 74, 0.13) 64%, transparent 64.1%),
    linear-gradient(136deg, transparent 68%, rgba(255, 210, 74, 0.07) 68.1%, rgba(255, 210, 74, 0.07) 72%, transparent 72.1%),
    radial-gradient(circle at 84% 8%, rgba(198, 255, 79, 0.13), transparent 56%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -42%;
  width: 58%;
  height: 96%;
  z-index: -1;
  background: rgba(255, 210, 74, 0.05);
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  padding-block: clamp(24px, 4vw, 40px) clamp(48px, 7vw, 88px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 96px;
  height: 6px;
  margin-top: 22px;
  background: var(--about-yellow);
}

.page-about .about-hero__lede {
  max-width: 46em;
  font-size: clamp(1rem, 1.4vw, 1.09rem);
  line-height: 1.85;
  color: #D8E3DC;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-hero__side {
  position: relative;
  border: var(--edge);
  border-left: 6px solid var(--about-yellow);
  background: rgba(10, 10, 10, 0.55);
  box-shadow: var(--shadow);
  padding: 24px 22px 26px;
}

.page-about .about-hero__side-label {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-yellow);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-hero__stat {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px dashed rgba(143, 167, 154, 0.32);
}

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

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-hero__stat-label {
  font-size: 0.86rem;
  line-height: 1.6;
  color: #B9C9C0;
}

.page-about .about-hero__vnote {
  position: absolute;
  top: 14px;
  right: 10px;
  color: rgba(255, 210, 74, 0.7);
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 4vw, 52px);
}

.page-about .about-origin__text p {
  max-width: 40em;
  margin: 0 0 18px;
  line-height: 1.9;
  color: #D6E2DB;
}

.page-about .about-origin__text p:first-child::first-letter {
  float: left;
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 0.92;
  margin: 4px 10px 0 0;
  color: var(--about-yellow);
}

.page-about .about-origin__layers {
  display: grid;
  gap: 0;
  border: var(--edge);
  background: rgba(18, 54, 42, 0.5);
  box-shadow: var(--shadow);
}

.page-about .about-layer {
  position: relative;
  padding: 22px 22px 24px 74px;
  border-bottom: 2px solid rgba(26, 26, 24, 0.85);
}

.page-about .about-layer:last-child {
  border-bottom: 0;
}

.page-about .about-layer::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 6px;
  background: var(--about-yellow);
}

.page-about .about-layer[data-tone="neon"]::before { background: var(--neon); }
.page-about .about-layer[data-tone="red"]::before { background: var(--red); }

.page-about .about-layer__idx {
  position: absolute;
  top: 20px;
  left: 20px;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  opacity: 0.55;
}

.page-about .about-layer__title {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-layer__body {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: #B9C9C0;
}

/* ---------- 02 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  isolation: isolate;
  border-block: var(--edge);
  background: var(--ink-3);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 0.16;
  filter: grayscale(38%) contrast(115%);
}

.page-about .about-timeline::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(11, 31, 23, 0.86) 0%, rgba(11, 31, 23, 0.94) 100%);
  pointer-events: none;
}

.page-about .about-timeline__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-timeline__hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gray);
}

.page-about .about-timeline__rail {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  padding: 6px 6px 22px;
  scrollbar-width: thin;
}

.page-about .about-timeline__rail::-webkit-scrollbar {
  height: 8px;
}

.page-about .about-timeline__rail::-webkit-scrollbar-thumb {
  background: var(--about-rule);
  border-radius: 0;
}

.page-about .about-timeline__rail .timeline__node {
  position: relative;
  flex: 0 0 auto;
  width: var(--about-rail-max);
  scroll-snap-align: start;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 26px 22px 30px;
  border: var(--edge);
  border-top: 6px solid var(--about-yellow);
  background: var(--ink-2);
  box-shadow: var(--shadow);
  text-align: left;
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease), border-color 0.32s var(--ease);
}

.page-about .about-timeline__rail .timeline__node:nth-child(even) {
  transform: translateY(20px);
}

.page-about .about-timeline__rail .timeline__node:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--neon);
}

.page-about .about-timeline__rail .timeline__node:nth-child(even):hover {
  transform: translateY(16px);
}

.page-about .timeline__season {
  font-family: var(--font-mono);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--about-yellow);
}

.page-about .about-timeline__band {
  display: inline-block;
  align-self: start;
  padding: 4px 10px;
  border: 1px solid rgba(255, 210, 74, 0.45);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #E7DFC6;
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: #C2D2C9;
}

.page-about .about-timeline__corner {
  position: absolute;
  right: 12px;
  bottom: -14px;
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: rgba(242, 233, 216, 0.14);
  pointer-events: none;
}

/* ---------- 03 覆盖范围 ---------- */

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 48px);
}

.page-about .about-coverage__list {
  border-top: var(--edge);
}

.page-about .about-coverage__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 20px 4px;
  border-bottom: var(--rule);
  transition: background 0.3s var(--ease), padding-left 0.3s var(--ease);
}

.page-about .about-coverage__row:hover {
  background: rgba(255, 210, 74, 0.06);
  padding-left: 14px;
}

.page-about .about-coverage__lv {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .about-coverage__desc {
  font-size: 0.92rem;
  line-height: 1.78;
  color: #B9C9C0;
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: rgba(26, 26, 24, 0.7);
  border: var(--edge);
  box-shadow: var(--shadow);
}

.page-about .about-coverage__stat {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: 22px 18px 24px;
  background: var(--ink-2);
}

.page-about .about-coverage__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-coverage__stat-unit {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-yellow);
}

.page-about .about-coverage__stat-label {
  margin-top: 6px;
  font-size: 0.83rem;
  line-height: 1.7;
  color: #A9BBB1;
}

/* ---------- 04 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 48px);
}

.page-about .about-team__text p {
  max-width: 42em;
  margin: 0 0 16px;
  line-height: 1.9;
  color: #D6E2DB;
}

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

.page-about .about-team__frame {
  border: var(--edge);
  box-shadow: var(--shadow);
  position: relative;
}

.page-about .about-team__frame::after {
  content: "";
  position: absolute;
  inset: 10px -10px -10px 10px;
  border: 2px solid rgba(255, 210, 74, 0.4);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-team__roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin-top: clamp(36px, 5vw, 56px);
  border: var(--edge);
  background: rgba(26, 26, 24, 0.7);
  box-shadow: var(--shadow);
}

.page-about .about-team__role {
  padding: 24px 22px 26px;
  background: var(--ink);
  border-left: 6px solid var(--about-yellow);
}

.page-about .about-team__role-num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-team__role-title {
  margin: 12px 0 8px;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-team__role-body {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: #B9C9C0;
}

/* ---------- 05 版本 ---------- */

.page-about .about-versions__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 48px);
}

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

.page-about .about-versions__frame {
  border: var(--edge);
  box-shadow: var(--shadow-lg);
}

.page-about .about-versions__tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: 0;
  scrollbar-width: thin;
  border-bottom: var(--rule);
}

.page-about .about-versions__tabs .tab {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-about .about-versions__content {
  position: relative;
  margin-top: -2px;
  padding: 26px 22px 30px;
  border: var(--edge);
  background: var(--ink-2);
  box-shadow: var(--shadow);
}

.page-about .about-versions__content::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 5px;
  background: var(--about-yellow);
}

.page-about .about-versions__title {
  margin: 8px 0 12px;
  font-size: 1.24rem;
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-versions__body {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.88;
  color: #C2D2C9;
}

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

.page-about .about-versions__list li {
  padding: 6px 12px;
  border: 1px solid rgba(255, 210, 74, 0.42);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: #E7DFC6;
  background: rgba(255, 210, 74, 0.06);
}

/* ---------- 06 下一步 ---------- */

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-next__card {
  position: relative;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 28px 24px 30px;
  border: var(--edge);
  background: var(--ink-2);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease), border-color 0.32s var(--ease);
}

.page-about .about-next__card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--neon);
}

.page-about .about-next__card-idx {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--about-yellow);
}

.page-about .about-next__card-title {
  margin: 4px 0 0;
  font-size: 1.24rem;
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-next__card-body {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.84;
  color: #B9C9C0;
}

.page-about .about-next__card-link {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .about-next__card:hover .about-next__card-link {
  color: var(--paper);
}

.page-about .about-next__card--slim {
  background: var(--night);
  border-left: 6px solid var(--about-yellow);
}

/* ---------- 响应式 ---------- */

@media (min-width: 780px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

  .page-about .about-coverage__row {
    grid-template-columns: 190px 1fr;
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
  }

  .page-about .about-hero__side {
    margin-bottom: 6px;
  }

  .page-about .about-timeline__rail .timeline__node {
    width: 340px;
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

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

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

  .page-about .about-next__card:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .about-next__card:nth-child(3) {
    margin-top: -12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__rail .timeline__node,
  .page-about .about-next__card,
  .page-about .about-coverage__row {
    transition: none;
  }

  .page-about .about-timeline__rail .timeline__node:nth-child(even) {
    transform: none;
  }

  .page-about .about-timeline__rail .timeline__node:hover,
  .page-about .about-timeline__rail .timeline__node:nth-child(even):hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}
<<<END>>>