.page-about {
  position: relative;
  padding-bottom: clamp(48px, 8vw, 110px);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 620px;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(180deg, var(--line) 0 1px, transparent 1px 96px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .6), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .6), transparent 76%);
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  margin: 0;
  color: var(--c-white);
}

.page-about h1 {
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: .01em;
}

.page-about h2 {
  font-size: clamp(1.5rem, 3vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: .02em;
  margin-top: 8px;
}

.page-about h3 {
  font-size: 1.05rem;
  letter-spacing: .05em;
}

.page-about .eyebrow {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--c-muted);
  text-transform: uppercase;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 18px calc(var(--gutter) / 2) 0;
}

.page-about .about-index__link {
  color: var(--c-muted);
  text-decoration: none;
  font-size: .78rem;
  letter-spacing: .1em;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

/* ---------- 开篇 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 5vw, 60px) 0 0;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-hero__text {
  display: grid;
  gap: 16px;
  align-content: center;
}

.page-about .about-hero__lead {
  margin: 0;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--c-white);
  max-width: 44ch;
}

.page-about .about-hero__note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-lime);
  color: var(--c-muted);
  font-size: .9rem;
  line-height: 1.8;
  max-width: 44ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-carbon);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 三个数字 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: clamp(34px, 5vw, 60px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-stats__item {
  background: var(--c-ink);
  padding: 20px clamp(18px, 2.6vw, 30px) 22px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-stats__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--c-muted);
}

.page-about .about-stats__value {
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stats__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  line-height: 1;
  color: var(--c-lime);
  letter-spacing: .02em;
}

.page-about .about-stats__desc {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--c-white);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  display: grid;
  gap: 8px;
  max-width: 62ch;
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-head__lead {
  margin: 0;
  color: var(--c-muted);
  font-size: .95rem;
  line-height: 1.8;
}

/* ---------- 四个栏目 ---------- */
.page-about .about-columns {
  display: grid;
  gap: 16px;
}

.page-about .about-col {
  --accent: var(--c-lime);
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 24px 20px 22px;
  background: var(--c-carbon);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-col::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--accent);
  transform: scaleX(.2);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-col:hover {
  border-color: var(--line-strong);
  background: var(--c-slate);
}

.page-about .about-col:hover::before {
  transform: scaleX(1);
}

.page-about .about-col--cyan { --accent: var(--c-cyan); }
.page-about .about-col--orange { --accent: var(--c-orange); }
.page-about .about-col--amber { --accent: var(--c-amber); }

.page-about .about-col__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--accent);
}

.page-about .about-col p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 编辑团队 ---------- */
.page-about .about-team__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-team__text {
  display: grid;
  gap: 14px;
}

.page-about .about-team__text p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--c-white);
  max-width: 56ch;
}

.page-about .about-team__squads {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-team__squad {
  display: grid;
  gap: 10px;
  padding: 16px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  font-size: .86rem;
  line-height: 1.5;
  color: var(--c-white);
  background: var(--c-deep);
}

.page-about .about-team__squad:nth-child(2) { background: rgba(43, 227, 176, .13); }
.page-about .about-team__squad:nth-child(3) { background: rgba(255, 106, 31, .13); }
.page-about .about-team__squad:nth-child(4) { background: rgba(245, 197, 66, .13); }

.page-about .about-team__squad span {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--c-muted);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-carbon);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-team__figcaption {
  padding: 14px 18px 16px;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--c-muted);
  border-top: 1px solid var(--line);
  background: var(--c-carbon);
}

/* ---------- 发展历程时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-lime), rgba(200, 255, 61, .08));
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 30px 44px;
}

.page-about .tl__item:last-child {
  padding-bottom: 8px;
}

.page-about .tl__marker {
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--c-lime);
  background: var(--c-ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__item:hover .tl__marker {
  background: var(--c-lime);
  box-shadow: 0 0 0 6px rgba(200, 255, 61, .16);
}

.page-about .tl__year {
  margin: 0;
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--c-lime);
}

.page-about .tl__title {
  margin: 6px 0 8px;
  font-size: 1.12rem;
}

.page-about .tl__desc {
  margin: 0;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--c-white);
  max-width: 60ch;
}

.page-about .tl__hint {
  margin: 10px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--c-muted);
  opacity: .58;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl__item:hover .tl__hint {
  opacity: 1;
  color: var(--c-white);
  border-left-color: var(--c-lime);
}

.page-about .about-timeline__figure {
  margin: clamp(30px, 4.6vw, 50px) 0 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--c-carbon);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__inner {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  align-items: center;
}

.page-about .about-partners__text {
  display: grid;
  gap: 14px;
}

.page-about .about-partners__text p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--c-white);
  max-width: 56ch;
}

.page-about .about-partners__links {
  color: var(--c-muted) !important;
  font-size: .92rem !important;
}

.page-about .about-partners__links a,
.page-about .about-promise__links a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 176, .38);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-partners__links a:hover,
.page-about .about-promise__links a:hover {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-about .about-orbit {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.page-about .orbit {
  --orbit-size: min(340px, 76vw);
  --orbit-r: calc(var(--orbit-size) * .4);
  position: relative;
  width: var(--orbit-size);
  height: var(--orbit-size);
  margin: 0;
  padding: 0;
  list-style: none;
  border-radius: 50%;
  border: 1px dashed var(--line);
}

.page-about .orbit::before {
  content: "";
  position: absolute;
  inset: 26%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 34%, rgba(22, 69, 58, .85), rgba(11, 31, 26, 0) 72%);
}

.page-about .orbit::after {
  content: "";
  position: absolute;
  inset: 21%;
  border-radius: 50%;
  border: 1px dashed var(--line);
}

.page-about .orbit__dot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  --a: 0deg;
  transform: rotate(var(--a)) translateY(calc(-1 * var(--orbit-r))) rotate(calc(-1 * var(--a)));
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .orbit__dot--cyan {
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(43, 227, 176, .14);
}

.page-about .orbit__dot--orange {
  background: var(--c-orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 31, .14);
}

.page-about .orbit__dot:hover {
  transform: rotate(var(--a)) translateY(calc(-1 * var(--orbit-r))) rotate(calc(-1 * var(--a))) scale(1.6);
  z-index: 3;
}

.page-about .orbit__type {
  position: absolute;
  left: 50%;
  top: 140%;
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 3px 9px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  background: var(--c-carbon);
  color: var(--c-white);
  font-size: .66rem;
  letter-spacing: .08em;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

.page-about .orbit__dot:hover .orbit__type,
.page-about .orbit__dot:focus-within .orbit__type {
  opacity: 1;
}

.page-about .orbit__legend {
  margin: 0;
  max-width: 34ch;
  text-align: center;
  font-size: .8rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .orbit__key {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 5px;
  border-radius: 50%;
  vertical-align: middle;
}

.page-about .orbit__key--cyan { background: var(--c-cyan); }
.page-about .orbit__key--orange { background: var(--c-orange); }

/* ---------- 更新节奏 ---------- */
.page-about .about-promise__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-promise__text {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-promise__text > p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--c-white);
  max-width: 58ch;
}

.page-about .about-promise__list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-promise__list li {
  font-size: .9rem;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-promise__k {
  display: inline-block;
  min-width: 5.2em;
  margin-right: 10px;
  color: var(--c-lime);
  font-size: .74rem;
  letter-spacing: .14em;
}

.page-about .about-promise__links {
  color: var(--c-muted) !important;
}

.page-about .about-promise__card {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 26px 24px 28px;
  border-radius: var(--r-xl);
  border: 1px solid var(--line-strong);
  background: linear-gradient(160deg, var(--c-slate), var(--c-carbon) 72%);
}

.page-about .about-promise__card-label {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--c-cyan);
}

.page-about .about-promise__card-text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--c-white);
}

.page-about .about-promise__card .btn {
  justify-self: start;
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team__squads {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
  }

  .page-about .about-promise__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-columns {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1440px) {
  .page-about .about-index {
    position: fixed;
    right: 26px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 6;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    padding: 0;
  }

  .page-about .about-index__link {
    font-size: .72rem;
    letter-spacing: .14em;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
  }
}