.page-about {
  --about-sec: clamp(48px, 8vw, 96px);
  --about-gap: clamp(24px, 4vw, 44px);
  background: var(--mist);
  color: var(--deep-text);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(14px, 2.5vw, 26px);
  padding-bottom: clamp(10px, 2vw, 18px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
}

.page-about .breadcrumb__item {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin: 0 9px;
  color: var(--slate);
  opacity: .45;
}

.page-about .breadcrumb__link {
  color: var(--slate);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--orange);
}

.page-about .breadcrumb__item [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--mist);
  padding: clamp(44px, 8vw, 92px) 0 clamp(52px, 8vw, 88px);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -130px;
  right: -110px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  border: 1px solid rgba(255, 106, 43, .3);
  box-shadow:
    0 0 0 46px rgba(47, 191, 155, .07),
    0 0 0 92px rgba(255, 106, 43, .06);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  align-items: end;
}

.page-about .about-hero .kicker {
  color: var(--orange);
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.02em;
  color: #FFFFFF;
}

.page-about .hl {
  color: var(--orange);
}

.page-about .about-hero__desc {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(244, 247, 248, .8);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .stat {
  background: var(--ink-2);
  border: 1px solid var(--slate);
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .02em;
  color: rgba(244, 247, 248, .68);
}

/* ---------- 章节骨架 ---------- */
.page-about .sec {
  padding: var(--about-sec) 0;
}

.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(14px, 2vw, 20px);
  border-bottom: 1px solid var(--line);
}

.page-about .section-head__title {
  margin-top: 10px;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .section-head__note {
  margin-top: 10px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 58ch;
}

/* ---------- 起点与现在 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .origin-copy p {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .origin-copy p:first-child {
  font-size: 18.5px;
  color: var(--ink);
}

.page-about .origin-copy p:last-child {
  margin-bottom: 0;
  padding-left: 16px;
  border-left: 3px solid var(--orange);
  color: var(--ink-2);
}

.page-about .origin-aside {
  background: var(--ink);
  color: var(--mist);
  border-radius: var(--radius-lg);
  padding: clamp(22px, 3.2vw, 34px);
  box-shadow: var(--shadow);
}

.page-about .origin-aside__lead {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .origin-list {
  list-style: none;
  margin: 14px 0 22px;
  padding: 0;
}

.page-about .origin-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  border-top: 1px solid rgba(211, 219, 224, .16);
}

.page-about .origin-list li:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .origin-list__idx {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .origin-list strong {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  color: #FFFFFF;
}

.page-about .origin-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 247, 248, .74);
}

/* ---------- 团队构成 ---------- */
.page-about .team-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .role {
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  transition: border-color 180ms ease-out, box-shadow 240ms ease-out;
}

.page-about .role:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow);
}

.page-about .role__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .role__chip {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--mist);
  background: var(--ink-2);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  white-space: nowrap;
}

.page-about .role__count {
  margin-left: auto;
  width: 40px;
  height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 800;
}

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

.page-about .team-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team-figure figcaption {
  padding: 12px 18px 14px;
  border-top: 1px solid rgba(211, 219, 224, .14);
  font-size: 13px;
  line-height: 1.65;
  color: rgba(244, 247, 248, .7);
}

/* ---------- 现象 条件 动作 ---------- */
.page-about .method {
  display: grid;
  gap: 16px;
}

.page-about .method__col {
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 32px);
}

.page-about .method__col--cond {
  background: #FFFFFF;
  border: 1px solid var(--line);
}

.page-about .method__col--act {
  background: var(--ink);
  color: var(--mist);
}

.page-about .method__title {
  margin: 0 0 18px;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.55;
}

.page-about .method__col--cond .method__title {
  color: var(--ink);
}

.page-about .method__col--act .method__title {
  color: #FFFFFF;
}

.page-about .cond-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .cond-list li {
  border-left: 3px solid var(--teal);
  padding-left: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .cond-list span {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--ink-2);
}

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

.page-about .act-list li {
  counter-increment: act;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 248, .86);
}

.page-about .act-list li::before {
  content: counter(act, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--orange);
}

/* ---------- 成长阶段 ---------- */
.page-about .stair {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .stair__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  transition: transform 240ms ease-out, box-shadow 240ms ease-out;
}

.page-about .stair__item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.page-about .stair__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .stair__title {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .stair__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .stair-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .stair-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 合作网络 ---------- */
.page-about .network-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .network-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink);
}

.page-about .network-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .network-body p {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .network-tags {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 三件事 ---------- */
.page-about .sec--tenets {
  background: #FFFFFF;
}

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

.page-about .tenet {
  background: var(--ink);
  color: var(--mist);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 30px);
  transition: transform 240ms ease-out;
}

.page-about .tenet:hover {
  transform: translateY(-4px);
}

.page-about .tenet__idx {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .tenet:nth-child(2) .tenet__idx {
  color: var(--teal);
}

.page-about .tenet:nth-child(3) .tenet__idx {
  color: var(--amber);
}

.page-about .tenet__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: #FFFFFF;
}

.page-about .tenet p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 247, 248, .78);
}

/* ---------- 结尾行动区 ---------- */
.page-about .sec--cta {
  background: var(--ink);
  color: var(--mist);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: clamp(44px, 7vw, 84px) 0;
}

.page-about .cta {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .cta .kicker {
  margin: 0;
  color: var(--orange);
}

.page-about .cta h2 {
  margin: 12px 0 12px;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -.02em;
  color: #FFFFFF;
}

.page-about .cta__body p {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 247, 248, .78);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 780px) {
  .page-about .tenets {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 820px) {
  .page-about .method {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
  }
}

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

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .network-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .stair__item:nth-child(2) {
    margin-left: 6%;
  }

  .page-about .stair__item:nth-child(3) {
    margin-left: 12%;
  }

  .page-about .stair__item:nth-child(4) {
    margin-left: 18%;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .role__head {
    flex-wrap: wrap;
  }

  .page-about .role__count {
    margin-left: 0;
  }

  .page-about .act-list li {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .act-list li::before {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .stair__item,
  .page-about .tenet {
    transition: none;
  }
}