.page-about {
  --about-rail: 178px;
  background: var(--cream);
  color: var(--char);
}

.page-about img {
  max-width: 100%;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 48px;
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(62, 92, 75, 0.62) 0%, rgba(11, 42, 34, 0) 62%),
    var(--ink);
  color: var(--cream);
  border-radius: 0 0 var(--r-xl) var(--r-xl);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(242, 235, 221, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(242, 235, 221, 0.07) 1px, transparent 1px);
  background-size: 120px 120px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 30px;
  right: -70px;
  width: 230px;
  height: 230px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 42, 0.34), rgba(255, 106, 42, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero__crumb {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(242, 235, 221, 0.62);
}

.page-about .about-hero__crumb a {
  color: rgba(242, 235, 221, 0.84);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--signal);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.4rem, 11vw, 5.2rem);
  font-weight: 200;
  line-height: 0.98;
  letter-spacing: -0.045em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 22px 0 0;
  font-size: clamp(15px, 3.9vw, 18px);
  line-height: 1.75;
  color: rgba(242, 235, 221, 0.85);
}

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

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(242, 235, 221, 0.16);
  border: 1px solid rgba(242, 235, 221, 0.16);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 18px 18px;
  background: rgba(7, 30, 23, 0.62);
}

.page-about .about-stat__v {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 7vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cream);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__k {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(242, 235, 221, 0.72);
}

@media (min-width: 920px) {
  .page-about .about-hero {
    padding: 34px 0 60px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: 46px 0 72px;
}

.page-about .about-body__grid {
  display: grid;
  gap: 34px;
}

@media (min-width: 1024px) {
  .page-about .about-body {
    padding: 64px 0 96px;
  }
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 左侧坐标刻度 ---------- */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 108px;
  }
}

.page-about .about-rail__title {
  margin: 0 0 16px;
  padding-left: 15px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--rock);
}

.page-about .about-rail__item {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 15px;
  border-left: 1px solid var(--line-dark);
  font-size: 13px;
  color: var(--rock);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--signal);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-visible {
  color: var(--ink);
}

.page-about .about-rail__item.is-current {
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-rail__item.is-current::before {
  height: 100%;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rock);
}

.page-about .about-rail__item.is-current .about-rail__num {
  color: var(--signal);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: 112px;
}

.page-about .about-chapter + .about-chapter {
  margin-top: 60px;
  padding-top: 48px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--signal);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.5rem, 5.6vw, 2.35rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--ink);
}

.page-about .about-chapter__lede {
  max-width: 62ch;
  margin: 0 0 24px;
  font-size: clamp(15px, 3.9vw, 17.5px);
  line-height: 1.72;
  color: var(--moss);
}

.page-about .about-chapter p {
  max-width: 64ch;
  margin: 0 0 16px;
  line-height: 1.8;
  color: var(--char);
}

.page-about .about-chapter__figure {
  margin: 0 0 26px;
}

.page-about .about-chapter__more {
  margin: 24px 0 0;
}

.page-about .about-chapter a:not(.btn) {
  color: var(--stand);
  text-underline-offset: 3px;
}

/* ---------- 服务对象 ---------- */
.page-about .about-serve {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-serve__item {
  padding: 18px;
  background: var(--mist);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
}

.page-about .about-serve__item p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

.page-about .about-serve__tag {
  font-size: 12px;
}

@media (min-width: 720px) {
  .page-about .about-serve {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-stage {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .about-stage__item {
  position: relative;
  padding: 0 0 30px 38px;
}

.page-about .about-stage__item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--turf), rgba(111, 143, 106, 0.12));
}

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

.page-about .about-stage__item:last-child::before {
  display: none;
}

.page-about .about-stage__node {
  position: absolute;
  left: 0;
  top: 2px;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 2px solid var(--turf);
  border-radius: 50%;
  background: var(--cream);
  color: var(--turf);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-stage__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--moss);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 24px;
  padding: 26px 20px;
  background: var(--moss);
  color: var(--cream);
  border-radius: var(--r-xl);
}

.page-about .about-team__stats {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-team__stats li {
  padding-left: 12px;
  border-left: 2px solid rgba(242, 235, 221, 0.3);
}

.page-about .about-team__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cream);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__l {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(242, 235, 221, 0.74);
}

.page-about .about-team__folds {
  border-top: 1px solid rgba(242, 235, 221, 0.24);
}

.page-about .about-team__fold {
  border-bottom: 1px solid rgba(242, 235, 221, 0.24);
}

.page-about .about-team__fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--cream);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-team__fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-team__fold[open] summary::after {
  content: "−";
}

.page-about .about-team__count {
  margin-left: auto;
  margin-right: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--signal);
}

.page-about .about-team__fold p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 235, 221, 0.84);
}

@media (min-width: 720px) {
  .page-about .about-team {
    padding: 34px 30px;
  }
  .page-about .about-team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-coop {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-coop__item {
  position: relative;
  overflow: hidden;
  padding: 20px 18px 20px;
  background: var(--mist);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
}

.page-about .about-coop__item::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 44px;
  height: 44px;
  background: var(--turf);
  opacity: 0.16;
  border-radius: 0 0 0 44px;
}

.page-about .about-coop__item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-coop__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

@media (min-width: 720px) {
  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 坐标读法 ---------- */
.page-about .about-method {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-method__item {
  padding: 20px 18px 22px;
  background: var(--mist);
}

.page-about .about-method__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .about-method__item h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-method__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

@media (min-width: 760px) {
  .page-about .about-method {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-method__item {
    padding: 24px 24px 26px;
  }
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-cadence__item {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--mist);
  border-left: 3px solid var(--stand);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .about-cadence__item strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-cadence__item span {
  font-size: 14px;
  line-height: 1.72;
  color: var(--moss);
}

@media (min-width: 760px) {
  .page-about .about-cadence__item {
    grid-template-columns: 118px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
    padding: 16px 20px;
  }
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding: 28px 22px;
  background:
    radial-gradient(110% 90% at 88% 0%, rgba(255, 106, 42, 0.22) 0%, rgba(255, 106, 42, 0) 60%),
    var(--ink);
  color: var(--cream);
  border-radius: var(--r-xl);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(1.25rem, 4.8vw, 1.7rem);
  font-weight: 300;
  line-height: 1.32;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .about-cta p {
  max-width: 56ch;
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(242, 235, 221, 0.82);
}

.page-about .about-cta a:not(.btn) {
  color: var(--signal);
  text-underline-offset: 3px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .about-cta {
    padding: 36px 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__item::before {
    transition: none;
  }
}
</main>