.page-about {
  --about-slant: clamp(26px, 5vw, 72px);
  display: block;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: calc(var(--header-h) + 2.5rem) calc(3rem + var(--about-slant));
  background:
    radial-gradient(115% 78% at 88% -8%, rgba(18, 225, 206, 0.11), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(201, 151, 63, 0.13), transparent 62%),
    linear-gradient(180deg, #16181A 0%, #1c2124 58%, #16181A 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: var(--about-slant);
  background: linear-gradient(90deg, var(--charcoal) 0%, #2a2f33 60%, var(--charcoal) 100%);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.25rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__title {
  margin: 0.65rem 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.08;
  font-size: clamp(2.1rem, 7.2vw, 3.9rem);
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin-top: 1.1rem;
  max-width: 34rem;
  color: rgba(243, 240, 233, 0.82);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.75rem;
  margin: 1.9rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-left: 0.85rem;
  border-left: 3px solid var(--loess);
  min-width: 8.5rem;
}

.page-about .about-hero__fact-num {
  font-size: 1.6rem;
  line-height: 1;
  color: var(--surge);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__fact-label {
  font-size: 0.83rem;
  line-height: 1.5;
  color: var(--mist);
  max-width: 12rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
  background: var(--charcoal);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0.9rem;
  padding: 0.35rem 0.8rem;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--loess);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(2.6rem, 6vw, 4.5rem);
}

.page-about .about-chapter--tint {
  background: linear-gradient(180deg, #1d2124 0%, var(--charcoal) 45%, #1d2124 100%);
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.55rem 0.9rem;
  padding-left: 0.9rem;
  border-left: 4px solid var(--loess);
  margin-bottom: 1.5rem;
}

.page-about .about-chapter__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--loess);
  font-variant-numeric: tabular-nums;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.24;
  font-size: clamp(1.4rem, 4.4vw, 2.05rem);
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-chapter__lede {
  margin: 0 0 1.75rem;
  max-width: 38rem;
  color: rgba(243, 240, 233, 0.78);
}

.page-about .about-copy .prose {
  max-width: 34rem;
}

.page-about .about-copy .prose + .prose {
  margin-top: 1rem;
}

.page-about .about-sub {
  margin: 0 0 0.6rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--surge);
}

/* ---------- 双栏 ---------- */
.page-about .about-two {
  display: grid;
  gap: 2rem;
}

.page-about .about-two--split {
  margin-top: 2.25rem;
}

/* ---------- 侧轨 ---------- */
.page-about .about-aside {
  padding: 1.25rem 1.15rem 1.4rem;
  background: var(--charcoal);
  border-top: 3px solid var(--loess);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.page-about .about-aside--contact {
  border-top-color: var(--surge);
}

.page-about .about-aside__label {
  margin: 0 0 1rem;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--loess);
}

.page-about .about-aside--contact .about-aside__label {
  color: var(--surge);
}

.page-about .about-aside__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.page-about .about-aside__row {
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: baseline;
}

.page-about .about-aside__num {
  font-size: 1.35rem;
  line-height: 1;
  color: var(--surge);
  font-variant-numeric: tabular-nums;
}

.page-about .about-aside__text {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-aside__line {
  margin: 0 0 0.7rem;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-aside__key {
  display: inline-block;
  min-width: 3rem;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-aside__note {
  margin: 1rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(243, 240, 233, 0.1);
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 三层结构 ---------- */
.page-about .layers {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.page-about .layers__item {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.15rem 0.6rem;
  padding: 1rem 1.05rem;
  background: rgba(35, 39, 43, 0.92);
  border-left: 3px solid var(--eave);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .layers__item--l2 {
  margin-left: 0.9rem;
  border-left-color: var(--loess);
}

.page-about .layers__item--l3 {
  margin-left: 1.8rem;
  border-left-color: var(--brick);
}

.page-about .layers__item:hover,
.page-about .layers__item:focus-within {
  background: #2c3237;
  border-left-color: var(--surge);
  transform: translateX(4px);
}

.page-about .layers__code {
  grid-row: span 2;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--loess);
  padding-top: 0.2rem;
}

.page-about .layers__item:hover .layers__code {
  color: var(--surge);
}

.page-about .layers__name {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .layers__use {
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-about .layers__item:hover .layers__use {
  color: rgba(243, 240, 233, 0.9);
}

/* ---------- 版本长卷 ---------- */
.page-about .about-chapter--milestones {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #14161a 0%, #191d20 50%, #14161a 100%);
}

.page-about .about-chapter__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-chapter__watermark {
  position: absolute;
  right: -0.5rem;
  bottom: -1.2rem;
  font-size: clamp(5rem, 20vw, 14rem);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: rgba(243, 240, 233, 0.045);
  pointer-events: none;
  user-select: none;
}

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

.page-about .vtl {
  position: relative;
  margin: 0;
  padding: 0 0 0 2.4rem;
  list-style: none;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  left: 0.6rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--loess) 0%, var(--deep-surge) 48%, var(--eave) 100%);
}

.page-about .vtl__item {
  position: relative;
  margin-bottom: 0.85rem;
}

.page-about .vtl__item::before {
  content: "";
  position: absolute;
  left: -1.8rem;
  top: 1.15rem;
  width: 10px;
  height: 10px;
  background: var(--lava);
  transform: translateX(-50%) rotate(45deg);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .vtl__item:has(.vtl__season[open])::before {
  background: var(--surge);
  box-shadow: 0 0 0 4px rgba(18, 225, 206, 0.16);
}

.page-about .vtl__season {
  background: rgba(35, 39, 43, 0.94);
  border: 1px solid rgba(243, 240, 233, 0.08);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .vtl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.8rem;
  padding: 0.95rem 1.05rem;
  cursor: pointer;
  list-style: none;
}

.page-about .vtl__summary::-webkit-details-marker {
  display: none;
}

.page-about .vtl__ver {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--surge);
  font-variant-numeric: tabular-nums;
}

.page-about .vtl__era {
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .vtl__hint {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .vtl__season[open] .vtl__hint {
  color: var(--lava);
}

.page-about .vtl__body {
  padding: 0 1.05rem 1.05rem;
  border-top: 1px solid rgba(243, 240, 233, 0.07);
}

.page-about .vtl__body p {
  margin: 0.85rem 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 36rem;
}

/* ---------- 团队 ---------- */
.page-about .about-figure {
  margin: 0 0 1.75rem;
  position: relative;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(243, 240, 233, 0.08);
}

.page-about .about-figure__caption {
  display: block;
  margin-top: 0.6rem;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crew {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.9rem;
}

.page-about .crew__block {
  padding: 1.1rem 1.15rem 1.25rem;
  border-radius: var(--radius-sm);
  border-top: 3px solid transparent;
}

.page-about .crew__block--data {
  background: linear-gradient(155deg, #2b3237 0%, #23272B 100%);
  border-top-color: var(--surge);
}

.page-about .crew__block--edit {
  background: linear-gradient(155deg, #33272a 0%, #23272B 100%);
  border-top-color: var(--brick);
}

.page-about .crew__block--tech {
  background: linear-gradient(155deg, #1f3331 0%, #23272B 100%);
  border-top-color: var(--deep-surge);
}

.page-about .crew__count {
  margin: 0;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .crew__name {
  margin: 0.55rem 0 0.45rem;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--paper);
}

.page-about .crew__desc {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-top: 4px solid var(--loess);
  background: linear-gradient(180deg, #1b1f22 0%, #16181A 100%);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-next__lede {
  margin: 0 0 1.75rem;
  max-width: 34rem;
  color: rgba(243, 240, 233, 0.8);
}

.page-about .about-next__links {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-next__link {
  display: block;
  padding: 1rem 1.1rem;
  background: var(--charcoal);
  border-left: 3px solid var(--eave);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  text-decoration: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-next__link--lava {
  border-left-color: var(--lava);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: #2c3237;
  border-left-color: var(--surge);
  transform: translateX(4px);
}

.page-about .about-next__link-title {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-next__link-desc {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .crew {
    flex-direction: row;
  }

  .page-about .crew__block--data {
    flex: 0 0 32%;
  }

  .page-about .crew__block--edit {
    flex: 0 0 25%;
  }

  .page-about .crew__block--tech {
    flex: 1 1 43%;
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-two {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-two--split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1.75rem, 3.5vw, 3rem);
  }

  .page-about .about-chapter__head {
    padding-left: 1.1rem;
    margin-bottom: 1.9rem;
  }

  .page-about .vtl {
    padding-left: 3.2rem;
  }

  .page-about .vtl::before {
    left: 0.9rem;
  }

  .page-about .vtl__item::before {
    left: -2.3rem;
  }

  .page-about .about-chapter__watermark {
    right: 2rem;
    bottom: -2rem;
  }
}

@media (min-width: 1180px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .layers__item,
  .page-about .vtl__item::before,
  .page-about .about-next__link {
    transition-property: background-color, border-color, opacity;
    transition-duration: 1ms;
  }

  .page-about .layers__item:hover,
  .page-about .layers__item:focus-within,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>