.page-about {
  --about-axis-x: clamp(30px, 6vw, 56px);
  --about-gap: clamp(18px, 3.4vw, 34px);
  display: block;
}

.page-about [data-section] {
  scroll-margin-top: 84px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 64px) 0 clamp(32px, 6vw, 72px);
  background:
    linear-gradient(158deg, var(--c-indigo) 0%, var(--c-indigo-deep) 58%, var(--c-charcoal-2) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -12%;
  width: min(76vw, 640px);
  height: min(76vw, 640px);
  background: radial-gradient(circle at 34% 34%, rgba(45, 226, 230, 0.2), transparent 64%);
  clip-path: polygon(22% 0, 100% 0, 100% 76%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  bottom: -30%;
  width: min(58vw, 420px);
  height: min(58vw, 420px);
  background: radial-gradient(circle at 60% 60%, rgba(255, 107, 53, 0.16), transparent 68%);
  clip-path: polygon(0 0, 78% 26%, 100% 100%, 22% 84%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 5vw, 48px);
  margin-top: clamp(18px, 4vw, 32px);
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(27px, 6vw, 52px);
  line-height: 1.14;
  letter-spacing: 0.005em;
  color: var(--c-fog);
  max-width: 19ch;
}

.page-about .about-hero__copy .lede {
  margin-top: clamp(14px, 2.4vw, 22px);
  max-width: 56ch;
  color: var(--c-mist);
}

.page-about .about-hero__meta {
  margin-top: 16px;
  font-size: var(--step-14);
  color: var(--c-cyan);
  letter-spacing: 0.04em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero__board {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-1);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .about-hero__board-title {
  margin: 0;
  font-size: var(--step-14);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-orange);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-hero__facts li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-hero__fact-num {
  flex: 0 0 auto;
  font-size: var(--step-28);
  line-height: 1;
  color: var(--c-fog);
}

.page-about .about-hero__fact-num em {
  font-style: normal;
  font-size: var(--step-14);
  color: var(--c-cyan);
  margin-left: 2px;
}

.page-about .about-hero__fact-text {
  font-size: var(--step-14);
  line-height: 1.5;
  color: var(--c-mist);
}

/* ---------- 导读 ---------- */

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-jump__label {
  font-size: var(--step-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-mist);
}

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

.page-about .about-jump__link {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--glass);
  color: var(--c-mist);
  font-size: var(--step-14);
  text-decoration: none;
  transition:
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible,
.page-about .about-jump__link[aria-current] {
  color: var(--c-fog);
  border-color: var(--c-cyan);
  background: rgba(45, 226, 230, 0.1);
}

/* ---------- 品牌起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-origin__aside {
  margin-top: clamp(16px, 3vw, 24px);
  padding-left: 16px;
  border-left: 2px solid var(--c-orange);
  font-size: var(--step-16);
  line-height: 1.7;
  color: var(--c-fog);
}

.page-about .about-axis {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-axis__item {
  position: relative;
  padding: 0 0 clamp(22px, 4vw, 34px) var(--about-axis-x);
}

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(45, 226, 230, 0.16);
}

.page-about .about-axis__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--line-strong), transparent);
}

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

.page-about .about-axis__item:last-child::after {
  display: none;
}

.page-about .about-axis__mark {
  display: block;
  font-size: var(--step-14);
  letter-spacing: 0.18em;
  color: var(--c-orange);
  margin-bottom: 6px;
}

.page-about .about-axis__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: var(--step-20);
  color: var(--c-fog);
}

.page-about .about-axis__body p {
  margin: 0;
  font-size: var(--step-16);
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 服务规模 ---------- */

.page-about .about-scale__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-scale__media {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--c-charcoal-2);
  overflow: hidden;
  margin: 0;
}

.page-about .about-scale__media img,
.page-about .about-team__media img,
.page-about .about-versions__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-scale__media figcaption,
.page-about .about-team__media figcaption,
.page-about .about-versions__media figcaption {
  padding: 10px 16px;
  font-size: var(--step-12);
  color: var(--c-mist);
  border-top: 1px solid var(--line);
}

.page-about .about-statrow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-stat {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(30, 37, 48, 0.62);
}

.page-about .about-stat .stat__value {
  display: block;
  font-size: var(--step-28);
  line-height: 1.1;
  color: var(--c-cyan);
}

.page-about .about-stat .stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--step-12);
  color: var(--c-mist);
}

/* ---------- 团队 ---------- */

.page-about .about-team__head .lede {
  margin-top: 14px;
  max-width: 62ch;
  color: var(--c-mist);
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .about-role {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(30, 37, 48, 0.94), rgba(22, 29, 42, 0.94));
  outline: none;
  transition:
    transform var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--c-orange);
  opacity: 0.35;
  transition: opacity var(--t-base) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within,
.page-about .about-role:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-1);
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-visible::before,
.page-about .about-role:focus-within::before {
  opacity: 1;
}

.page-about .about-role__num {
  margin: 0;
  font-size: clamp(34px, 5vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-fog);
}

.page-about .about-role__num-unit {
  margin-left: 4px;
  font-size: var(--step-14);
  color: var(--c-mist);
  letter-spacing: 0;
}

.page-about .about-role__title {
  margin: 12px 0 8px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: var(--step-20);
  color: var(--c-fog);
}

.page-about .about-role__line {
  margin: 0;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-role__more {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--c-mist);
  overflow: hidden;
  transition:
    max-height var(--t-slow) var(--ease),
    opacity var(--t-base) var(--ease),
    margin-top var(--t-base) var(--ease);
}

.page-about .about-team__media {
  margin: clamp(24px, 4vw, 38px) 0 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--c-charcoal-2);
  overflow: hidden;
}

/* ---------- 版本与兼容 ---------- */

.page-about .about-versions__head .prose {
  margin-top: 14px;
  max-width: 66ch;
}

.page-about .about-versions__track {
  list-style: none;
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-version {
  position: relative;
  padding: clamp(18px, 3vw, 24px);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(30, 37, 48, 0.72);
}

.page-about .about-version .track__index {
  display: inline-block;
  font-size: var(--step-14);
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .about-version h3 {
  margin: 10px 0 8px;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: var(--step-20);
  color: var(--c-fog);
}

.page-about .about-version p {
  margin: 0 0 14px;
  font-size: var(--step-14);
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-versions__media {
  margin: clamp(22px, 4vw, 34px) 0 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--c-charcoal-2);
  overflow: hidden;
}

.page-about .about-versions__media img {
  aspect-ratio: 3 / 1;
}

/* ---------- 备案与运营 ---------- */

.page-about .about-base__panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-2);
  padding: clamp(20px, 3.6vw, 40px);
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-base__copy .prose {
  margin-top: 14px;
  max-width: 60ch;
}

.page-about .about-base__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(16px, 3vw, 26px);
}

.page-about .about-base__list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  align-content: start;
}

.page-about .about-base__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-base__row:last-child {
  border-bottom: 0;
}

.page-about .about-base__key {
  margin: 0;
  font-size: var(--step-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .about-base__val {
  margin: 0;
  font-size: var(--step-16);
  line-height: 1.6;
  color: var(--c-fog);
}

.page-about .about-base__val.mono {
  color: var(--c-cyan);
}

/* ---------- 延伸入口 ---------- */

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(20px, 3.4vw, 32px);
}

.page-about .about-next__link {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 3vw, 22px);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(30, 37, 48, 0.6);
  text-decoration: none;
  transition:
    border-color var(--t-base) var(--ease),
    background-color var(--t-base) var(--ease),
    transform var(--t-base) var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--c-cyan);
  background: rgba(45, 226, 230, 0.08);
  transform: translateY(-2px);
}

.page-about .about-next__link-title {
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: var(--step-20);
  color: var(--c-fog);
}

.page-about .about-next__link-text {
  font-size: var(--step-14);
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 响应式 ---------- */

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.78fr);
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(240px, 0.82fr) minmax(0, 1.4fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-origin__intro {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .about-base__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  }

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

  .page-about .about-team__media {
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
  }
}

@media (min-width: 1200px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (pointer: fine) and (min-width: 960px) {
  .page-about .about-role__more {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
  }

  .page-about .about-role:hover .about-role__more,
  .page-about .about-role:focus-within .about-role__more,
  .page-about .about-role:focus-visible .about-role__more {
    max-height: 12em;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--line);
    opacity: 1;
  }
}

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

  .page-about .about-role:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }
}