.page-about {
  --about-block-gap: clamp(2.5rem, 5vw, 4rem);
  --about-side: 200px;
}

/* ---------- 首屏拼贴 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--gx-header-h) + 4rem) 0 clamp(2.5rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--gx-line);
}

.page-about .about-hero__arc {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

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

.page-about .about-hero__lead {
  max-width: 62ch;
}

.page-about .about-hero__title {
  margin: 1.1rem 0 1.4rem;
  max-width: 20ch;
  text-shadow: 0 0 34px rgba(108, 74, 182, 0.45);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 58ch;
}

.page-about .about-hero__note {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-hero__note {
    display: block;
    position: absolute;
    top: 1.5rem;
    right: 0;
    color: var(--gx-mute);
    letter-spacing: 0.42em;
  }
}

.page-about .about-hero__stats {
  margin-top: clamp(2.5rem, 5vw, 3.75rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--gx-line);
  border: 1px solid var(--gx-line);
}

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1.3rem 1.15rem;
  background: var(--gx-void);
}

.page-about .about-stat::before {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-bottom: 0.6rem;
  background: var(--gx-violet);
}

.page-about .about-stat:nth-child(2)::before { background: var(--gx-pink); }
.page-about .about-stat:nth-child(3)::before { background: var(--gx-cyan); }
.page-about .about-stat:nth-child(4)::before { background: var(--gx-gold); }

.page-about .about-stat__num {
  font-family: var(--gx-font-mono);
  font-size: clamp(1.45rem, 3.4vw, 2.05rem);
  letter-spacing: 0.02em;
  color: var(--gx-star);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gx-mute);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 5rem);
    align-items: start;
  }
}

.page-about .about-toc {
  border-top: 1px solid var(--gx-line);
  padding-top: 0.9rem;
}

@media (min-width: 980px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--gx-header-h) + 2rem);
  }
}

.page-about .about-toc__label {
  margin: 0 0 0.8rem;
}

.page-about .about-toc .gx-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.3rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc .gx-toc__list::-webkit-scrollbar {
  display: none;
}

@media (min-width: 980px) {
  .page-about .about-toc .gx-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }
}

.page-about .about-toc .gx-toc__link {
  display: block;
  padding: 0.55rem 0.85rem;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gx-mute);
  text-decoration: none;
  white-space: nowrap;
  border-left: 1px solid transparent;
  transition: color 0.22s ease, border-color 0.22s ease;
}

@media (min-width: 980px) {
  .page-about .about-toc .gx-toc__link {
    padding-left: 1rem;
    border-left: 1px solid var(--gx-line);
  }
}

.page-about .about-toc .gx-toc__link:hover {
  color: var(--gx-star);
}

.page-about .about-toc .gx-toc__link.is-active {
  color: var(--gx-star);
  border-left-color: var(--gx-pink);
}

/* ---------- 章节 ---------- */

.page-about .about-block {
  padding-block: var(--about-block-gap);
  scroll-margin-top: calc(var(--gx-header-h) + 2rem);
}

.page-about .about-block:first-child {
  padding-top: 0;
}

.page-about .about-block + .about-block {
  border-top: 1px solid var(--gx-line);
}

.page-about .about-block > .gx-title {
  margin: 0.7rem 0 1rem;
}

.page-about .about-block > .gx-lede {
  margin: 0 0 clamp(1.75rem, 3.5vw, 2.5rem);
  max-width: 62ch;
}

/* ---------- 三种身份 ---------- */

.page-about .about-identity {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
}

@media (min-width: 780px) {
  .page-about .about-identity {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
  }
}

.page-about .about-identity__item {
  padding: 0.2rem 0 0.2rem 1.25rem;
  border-left: 1px solid var(--gx-line-strong);
  transition: border-color 0.25s ease;
}

.page-about .about-identity__item:hover {
  border-left-color: var(--gx-pink);
}

.page-about .about-identity__num {
  display: block;
  margin-bottom: 0.65rem;
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gx-cyan);
}

.page-about .about-identity__name {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--gx-star);
}

.page-about .about-identity__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gx-mute);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline__figure {
  margin: 0 0 clamp(2rem, 4vw, 3rem);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.9rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--gx-violet), var(--gx-pink) 55%, var(--gx-gold));
  opacity: 0.6;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 2.25rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.9rem;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gx-void);
  border: 1px solid var(--gx-cyan);
  box-shadow: 0 0 14px rgba(79, 209, 224, 0.6);
}

.page-about .about-timeline__item:nth-child(2)::before {
  border-color: var(--gx-violet);
  box-shadow: 0 0 14px rgba(108, 74, 182, 0.7);
}

.page-about .about-timeline__item:nth-child(3)::before {
  border-color: var(--gx-pink);
  box-shadow: 0 0 14px rgba(232, 111, 168, 0.6);
}

.page-about .about-timeline__item:nth-child(4)::before {
  border-color: var(--gx-gold);
  box-shadow: 0 0 14px rgba(242, 183, 94, 0.6);
}

.page-about .about-timeline__phase {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-family: var(--gx-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gx-gold);
}

.page-about .about-timeline__title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--gx-star);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--gx-mute);
}

/* ---------- 服务范围 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
}

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

.page-about .about-coverage__p {
  margin: 0.9rem 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--gx-mute);
}

.page-about .about-facts {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--gx-line);
}

.page-about .about-facts > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--gx-line);
}

@media (min-width: 620px) {
  .page-about .about-facts > li {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 1.1rem;
    align-items: baseline;
  }
}

.page-about .about-facts__k {
  font-family: var(--gx-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gx-cyan);
}

.page-about .about-facts__v {
  font-size: 15px;
  line-height: 1.8;
  color: var(--gx-mute);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.2fr);
  }
}

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

.page-about .about-team__groups {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--gx-line);
  border: 1px solid var(--gx-line);
}

.page-about .about-team__group {
  padding: 1.15rem 1.25rem;
  background: var(--gx-deep);
  transition: background 0.25s ease;
}

.page-about .about-team__group:hover {
  background: rgba(108, 74, 182, 0.18);
}

.page-about .about-team__name {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--gx-star);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gx-mute);
}

/* ---------- 生态与荣誉 ---------- */

.page-about .about-eco {
  gap: 1.25rem;
}

.page-about .about-eco__panel {
  padding: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-eco__panel .gx-heading {
  margin: 0 0 0.75rem;
}

.page-about .about-eco__p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-eco__list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__list > li {
  padding: 0.65rem 0;
  border-top: 1px solid rgba(34, 26, 20, 0.16);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-eco__note {
  margin: 1.1rem 0 0;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-eco__note a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  border-top: 1px solid var(--gx-line);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-cta__inner {
  max-width: 66ch;
}

.page-about .about-cta__inner .gx-heading {
  margin: 0 0 0.9rem;
}

.page-about .about-cta__p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gx-mute);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 480px) {
  .page-about .about-hero {
    padding-top: calc(var(--gx-header-h) + 2.5rem);
  }

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

  .page-about .about-timeline {
    padding-left: 1.4rem;
  }

  .page-about .about-timeline__item::before {
    left: -1.4rem;
  }

  .page-about .about-cta__actions .gx-btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-identity__item,
  .page-about .about-team__group,
  .page-about .about-toc .gx-toc__link {
    transition: none;
  }
}