.page-about {
  --about-rail: 300px;
  --about-ink-soft: #46586A;
  background: var(--ink-deep);
  color: var(--mist);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(183, 243, 74, 0.10), transparent 58%),
    linear-gradient(165deg, rgba(19, 38, 58, 0.95), rgba(14, 27, 42, 1) 64%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 46%;
  background: linear-gradient(180deg, rgba(30, 58, 82, 0.85), rgba(19, 38, 58, 0.35));
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.2vw, 72px);
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--paper);
  max-width: 17em;
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-left: 1px solid var(--line-lime);
  padding-left: 12px;
}

.page-about .about-fact__num {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-fact__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-teal);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  right: -9px;
  bottom: -9px;
  width: 64px;
  height: 64px;
  border-right: 2px solid var(--lime);
  border-bottom: 2px solid var(--lime);
  pointer-events: none;
}

.page-about .about-hero__media img,
.page-about .about-teamfig img,
.page-about .about-versionfig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  --ch-strong: var(--paper);
  --ch-text: var(--mist);
  --ch-muted: var(--slate);
  --ch-line: var(--line);
  border-top: 1px solid var(--ch-line);
  background: var(--ink-deep);
}

.page-about .about-chapter--paper {
  --ch-strong: var(--ink-deep);
  --ch-text: var(--ink-text);
  --ch-muted: var(--about-ink-soft);
  --ch-line: var(--sage);
  background:
    linear-gradient(180deg, rgba(215, 224, 212, 0.55), rgba(243, 241, 232, 1) 22%),
    var(--paper);
  color: var(--ink-text);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: clamp(40px, 7vw, 84px);
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(56px, 11vw, 108px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--ink-teal);
}

@supports ((-webkit-text-stroke: 1px #000)) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.4px var(--orange);
  }
}

.page-about .about-chapter--paper .about-chapter__num {
  color: var(--sage);
}

@supports ((-webkit-text-stroke: 1px #000)) {
  .page-about .about-chapter--paper .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.4px var(--slate);
  }
}

.page-about .about-chapter__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.28;
  color: var(--ch-strong);
}

.page-about .about-chapter__lede {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--lime);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ch-muted);
}

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

/* ---------- 正文 ---------- */
.page-about .about-prose p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ch-text);
}

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

.page-about .about-prose strong {
  color: var(--ch-strong);
  font-weight: 700;
  background-image: linear-gradient(transparent 62%, rgba(183, 243, 74, 0.42) 62%);
}

.page-about .about-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-list li {
  position: relative;
  padding: 0 0 14px 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ch-text);
  border-bottom: 1px dashed var(--ch-line);
}

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

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

/* ---------- 折叠示意图 ---------- */
.page-about .about-foldwrap {
  margin: 30px 0 0;
  padding: 18px 16px 12px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(30, 58, 82, 0.45), rgba(19, 38, 58, 0.25));
}

.page-about .about-fold {
  display: block;
  width: 100%;
  height: auto;
  max-height: 190px;
}

.page-about .about-foldwrap__cap {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .about-teamfig {
  margin: 0 0 26px;
  border: 1px solid var(--ch-line);
}

.page-about .about-teamfig figcaption,
.page-about .about-versionfig figcaption {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ch-muted);
}

.page-about .about-roles {
  list-style: none;
  margin: 26px 0 26px;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ch-line);
}

.page-about .about-role {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  grid-template-areas:
    "tag name"
    "tag desc";
  gap: 6px 12px;
  padding: 18px 0 18px 12px;
  border-bottom: 1px solid var(--ch-line);
  transition: background 0.25s ease;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s ease;
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-within::before {
  transform: scaleY(1);
}

.page-about .about-role:hover {
  background: rgba(183, 243, 74, 0.07);
}

.page-about .about-role__tag {
  grid-area: tag;
  font-size: 13px;
  line-height: 1.6;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .about-role__name {
  grid-area: name;
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--ch-strong);
}

.page-about .about-role__desc {
  grid-area: desc;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ch-text);
}

/* ---------- 版本卡 ---------- */
.page-about .about-versionfig {
  margin: 26px 0 0;
  border: 1px solid var(--line);
}

.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.page-about .version-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(30, 58, 82, 0.55), rgba(19, 38, 58, 0.32));
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.page-about .version-card:hover,
.page-about .version-card:focus-within {
  border-color: var(--line-lime);
  background: linear-gradient(180deg, rgba(30, 58, 82, 0.8), rgba(19, 38, 58, 0.45));
  transform: translateY(-2px);
}

.page-about .version-card__tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .version-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .version-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .version-card__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .version-card:hover .version-card__more,
.page-about .version-card:focus-within .version-card__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 2px;
}

.page-about .version-card__list {
  list-style: none;
  margin: 0;
  padding: 10px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 8px;
}

.page-about .version-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .version-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--lime);
}

.page-about .version-card__link {
  margin-top: auto;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
  align-self: flex-start;
  padding-bottom: 2px;
}

.page-about .version-card__link:hover,
.page-about .version-card__link:focus-visible {
  color: var(--lime-soft);
  border-bottom-color: var(--lime-soft);
}

/* ---------- 出口区 ---------- */
.page-about .about-exit {
  border-top: 1px solid var(--line);
  background: var(--ink-bench);
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(44px, 6vw, 76px);
}

.page-about .about-exit__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-exit__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-exit__item a {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  background: rgba(14, 27, 42, 0.55);
  text-decoration: none;
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.page-about .about-exit__item a:hover,
.page-about .about-exit__item a:focus-visible {
  border-color: var(--line-lime);
  background: rgba(30, 58, 82, 0.7);
  transform: translateY(-2px);
}

.page-about .about-exit__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-exit__label {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .about-exit__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-exit__arrow {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px 16px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: end;
    gap: clamp(32px, 4.5vw, 64px);
  }

  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(220px, var(--about-rail)) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 78px);
    align-items: start;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 112px;
    align-self: start;
  }
}

@media (min-width: 1120px) {
  .page-about .about-exit__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (hover: none) {
  .page-about .version-card__more {
    max-height: 220px;
    opacity: 1;
    margin-top: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-card,
  .page-about .about-exit__item a,
  .page-about .about-role,
  .page-about .about-role::before {
    transition: none;
  }

  .page-about .version-card:hover,
  .page-about .version-card:focus-within,
  .page-about .about-exit__item a:hover,
  .page-about .about-exit__item a:focus-visible {
    transform: none;
  }

  .page-about .version-card__more {
    max-height: none;
    opacity: 1;
    transition: none;
    margin-top: 2px;
  }
}
<<<END>>>