.page-about {
  --about-pad: clamp(52px, 7.5vw, 108px);
  --about-line-ink: rgba(10, 21, 36, .12);
  display: block;
  background-color: var(--ink-900);
  color: var(--white);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-h) + clamp(26px, 5vw, 64px));
  padding-bottom: clamp(40px, 6vw, 82px);
  background:
    radial-gradient(130% 100% at 88% 4%, rgba(255, 122, 26, .14), transparent 56%),
    radial-gradient(96% 92% at 6% 94%, rgba(27, 74, 60, .9), transparent 62%),
    linear-gradient(158deg, var(--ink-900) 0%, var(--ink-800) 54%, var(--ink-700) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__wedge {
  position: absolute;
  z-index: 0;
  right: -9%;
  top: 3%;
  width: min(520px, 44%);
  aspect-ratio: 4 / 5;
  background: linear-gradient(200deg, var(--paper), rgba(242, 235, 223, .18));
  opacity: .1;
  transform: rotate(11deg);
  border-radius: 34px;
  pointer-events: none;
}

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

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 62ch;
  color: var(--white-72);
}

.page-about .about-hero__aside {
  margin-top: 16px;
  max-width: 52ch;
  padding-left: 14px;
  border-left: 2px solid var(--ember);
  font-size: 15px;
  line-height: 1.72;
  color: var(--white-56);
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin-top: clamp(34px, 5vw, 66px);
}

.page-about .about-hero__figures {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: clamp(24px, 3vw, 40px) auto 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-figure {
  padding: 20px 10px 0 clamp(0px, 2vw, 26px);
  border-left: 1px solid var(--line);
}

.page-about .about-hero__figures > .about-figure:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-about .about-figure__num {
  display: block;
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--white-56);
}

/* ---------- 时间线 ---------- */

.page-about .about-track {
  position: relative;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-about .about-track__vnote {
  position: absolute;
  top: clamp(40px, 6vw, 76px);
  right: clamp(8px, 3vw, 28px);
  color: var(--haze);
}

.page-about .about-track__head .lede {
  color: var(--white-56);
}

.page-about .about-track__list {
  position: relative;
  margin: clamp(32px, 4.5vw, 58px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 2.6vw, 34px);
}

.page-about .about-track__item {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: -5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ember);
  box-shadow: 0 0 0 4px rgba(255, 122, 26, .14);
}

.page-about .about-track__year {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-track__body p {
  max-width: 66ch;
  color: var(--white-72);
}

.page-about .about-track__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 12px;
}

.page-about .about-track__links a {
  font-size: 14px;
  color: var(--ember);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 26, .4);
  padding-bottom: 2px;
}

.page-about .about-track__links a:hover {
  border-bottom-color: var(--ember);
}

/* ---------- 浅色分区 ---------- */

.page-about .about-invert {
  background: var(--paper);
  color: var(--ink-900);
}

.page-about .about-invert .eyebrow {
  color: rgba(10, 21, 36, .5);
}

.page-about .about-invert .h2,
.page-about .about-invert .h3 {
  color: var(--ink-900);
}

.page-about .about-invert .lede {
  color: rgba(10, 21, 36, .68);
}

/* ---------- 团队 ---------- */

.page-about .about-team__head {
  margin-bottom: clamp(24px, 3.4vw, 42px);
}

.page-about .about-team__split {
  align-items: start;
}

.page-about .about-team__copy p {
  max-width: 60ch;
  color: rgba(10, 21, 36, .76);
}

.page-about .about-team__copy p + p {
  margin-top: 14px;
}

.page-about .about-team__list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-line-ink);
  border: 1px solid var(--about-line-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-team__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: var(--paper);
  font-size: 15px;
  color: rgba(10, 21, 36, .8);
}

.page-about .about-team__list .mono {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ember);
}

.page-about .about-team__media {
  margin-top: clamp(26px, 3vw, 8px);
}

.page-about .about-team__media .media__cap {
  color: rgba(10, 21, 36, .55);
}

/* ---------- 稳定版 ---------- */

.page-about .about-stable {
  background:
    radial-gradient(88% 70% at 10% 0%, rgba(217, 69, 111, .12), transparent 60%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-about .about-stable__shell {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.page-about .about-stable__copy p {
  max-width: 58ch;
  color: var(--white-72);
}

.page-about .about-stable__copy p + p {
  margin-top: 14px;
}

/* ---------- 流程 ---------- */

.page-about .about-flow__steps {
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-line-ink);
  border: 1px solid var(--about-line-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-step {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--paper);
}

.page-about .about-step__no {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ember);
}

.page-about .about-step__title {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-step p {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(10, 21, 36, .7);
}

/* ---------- 服务范围 ---------- */

.page-about .about-reach {
  background: linear-gradient(200deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-reach__shell {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
  align-items: end;
}

.page-about .about-reach__copy p {
  max-width: 60ch;
  color: var(--white-72);
}

.page-about .about-reach__copy p + p {
  margin-top: 14px;
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .about-reach__card {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(27, 74, 60, .38);
}

.page-about .about-reach__cardnum {
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ember);
  font-variant-numeric: tabular-nums;
}

.page-about .about-reach__cardlabel {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--white-72);
}

/* ---------- 伙伴 ---------- */

.page-about .about-partner {
  background: var(--ink-900);
}

.page-about .about-partner__grid {
  margin-top: clamp(26px, 3.4vw, 44px);
}

.page-about .about-partner__card {
  background: rgba(27, 74, 60, .3);
}

.page-about .about-partner__k {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partner__card .card__title {
  margin-top: 8px;
}

/* ---------- 三件事 ---------- */

.page-about .about-pillars {
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-700) 100%);
}

.page-about .about-pillars__list {
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-pillar {
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-pillar__no {
  display: block;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .about-pillar .h3 {
  margin: 10px 0 10px;
}

.page-about .about-pillar p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--white-72);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  background: var(--ink-900);
}

.page-about .about-cta__shell {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
  padding: clamp(30px, 4vw, 50px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-cta__copy p {
  margin-top: 12px;
  max-width: 60ch;
  color: var(--white-72);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-partner__card--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-cta__shell {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-track__item:nth-child(1) { margin-left: 0; }
  .page-about .about-track__item:nth-child(2) { margin-left: 8%; }
  .page-about .about-track__item:nth-child(3) { margin-left: 16%; }
  .page-about .about-track__item:nth-child(4) { margin-left: 24%; }
  .page-about .about-track__item:nth-child(5) { margin-left: 32%; }

  .page-about .about-reach__shell {
    grid-template-columns: 1.12fr .88fr;
  }

  .page-about .about-reach__cards {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 980px) {
  .page-about .about-stable__shell {
    grid-template-columns: .82fr 1.18fr;
  }

  .page-about .about-stable__media {
    margin-bottom: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

@media (max-width: 560px) {
  .page-about .about-hero__figures {
    grid-template-columns: 1fr;
    border-top: 0;
  }

  .page-about .about-figure {
    padding: 14px 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .about-hero__figures > .about-figure:first-child {
    border-top: 0;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item,
  .page-about .about-figure,
  .page-about .about-step,
  .page-about .about-pillar {
    transition: none;
  }
}