.page-about {
  --about-rail-w: 176px;
  background: var(--c-ink);
  color: var(--c-fog);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(26px, 6vw, 62px)) 0 0;
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.75) contrast(1.06);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(82, 255, 225, 0.1), transparent 58%),
    linear-gradient(180deg, rgba(6, 23, 19, 0.5) 0%, rgba(6, 23, 19, 0.86) 62%, var(--c-ink) 96%);
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding-bottom: clamp(28px, 5vw, 54px);
}
.page-about .about-hero__title {
  margin: clamp(12px, 2vw, 20px) 0 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(2.1rem, 8.4vw, 5rem);
  line-height: 1.08;
  letter-spacing: 0.07em;
  color: var(--c-fog);
  overflow-wrap: break-word;
}
.page-about .about-hero__title span {
  display: block;
  margin-top: clamp(12px, 2vw, 20px);
  font-size: clamp(0.98rem, 3.2vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.13em;
  color: var(--c-cyan);
}
.page-about .about-hero__lower {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(22px, 3.4vw, 38px);
}
.page-about .about-hero__lead {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--c-fog);
}
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
}
.page-about .about-figures__item {
  margin: 0;
}
.page-about .about-figures__label {
  margin: 0 0 5px;
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--c-silver);
}
.page-about .about-figures__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 4.4vw, 2rem);
  line-height: 1.1;
  color: var(--c-cyan);
}
@media (min-width: 880px) {
  .page-about .about-hero__lower {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }
}

/* ---------- 主体与章节轨道 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: clamp(22px, 3.6vw, 38px);
  padding-bottom: clamp(40px, 6vw, 80px);
}
.page-about .about-rail {
  margin-bottom: clamp(12px, 2vw, 20px);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-rail__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-silver);
}
.page-about .about-rail__list {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 0;
  white-space: nowrap;
  font-size: 13px;
  color: var(--c-silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-orange);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}
@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin: 0;
    padding: 0 0 0 14px;
    border-bottom: 0;
    border-left: 1px solid var(--c-line);
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-about .about-rail__link {
    padding: 7px 0;
    font-size: 13.5px;
    white-space: normal;
  }
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: clamp(30px, 5vw, 56px) 0;
  border-top: 1px solid var(--c-line);
}
.page-about .about-sec:first-child {
  padding-top: clamp(6px, 1.6vw, 14px);
  border-top: 0;
}
.page-about .about-sec__head {
  margin-bottom: clamp(18px, 3vw, 30px);
}
.page-about .about-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.2vw, 2.5rem);
  line-height: 1.28;
  letter-spacing: 0.05em;
  color: var(--c-fog);
}
.page-about .about-prose,
.page-about .about-intro {
  max-width: 40em;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.88;
  color: var(--c-fog);
}
.page-about .about-prose p,
.page-about .about-intro {
  margin: 0 0 16px;
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 主张区 ---------- */
.page-about .about-claim {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}
.page-about .about-claim__quote {
  margin: 0;
  padding: 16px 0 16px 20px;
  border-left: 3px solid var(--c-cyan);
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(1.15rem, 3.4vw, 1.6rem);
  line-height: 1.55;
  letter-spacing: 0.04em;
  color: var(--c-fog);
  background: linear-gradient(90deg, rgba(82, 255, 225, 0.08), transparent 72%);
}
.page-about .about-claim__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
  font-size: 13px;
  line-height: 1.85;
  color: var(--c-silver);
  max-width: 30em;
}
@media (min-width: 860px) {
  .page-about .about-claim {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(26px, 4vw, 54px);
  }
}

/* ---------- 内容体系 ---------- */
.page-about .about-system {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-ink-2);
}
.page-about .about-figure__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-silver);
}
.page-about .about-pillars {
  display: grid;
  gap: 2px;
}
.page-about .about-pillar {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 12px 14px 0;
  border-top: 1px solid var(--c-line);
  transition: background var(--ease);
}
.page-about .about-pillar:hover {
  background: rgba(11, 42, 36, 0.72);
}
.page-about .about-pillar__num {
  margin: 3px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-orange);
}
.page-about .about-pillar__title {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--c-fog);
}
.page-about .about-pillar__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--c-silver);
  max-width: 34em;
}
@media (min-width: 860px) {
  .page-about .about-system {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about .about-stat {
  margin: 0;
  padding: clamp(14px, 2.4vw, 22px);
  background: var(--c-ink-2);
}
.page-about .about-stat__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.4vw, 2.2rem);
  line-height: 1;
  color: var(--c-cyan);
}
.page-about .about-stat__label {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--c-silver);
}
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-cities li {
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-fog);
  border: 1px solid var(--c-line);
}

/* ---------- 多端 ---------- */
.page-about .about-devices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 3vw, 26px);
}
.page-about .about-device {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--c-ink-2);
  border: 1px solid var(--c-line);
  transition: border-color var(--ease);
}
.page-about .about-device:hover {
  border-color: var(--c-orange);
}
.page-about .about-device__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--c-fog);
}
.page-about .about-device__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--c-silver);
}
@media (min-width: 820px) {
  .page-about .about-devices {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-support {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(16px, 2.6vw, 24px);
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about .about-support__item {
  padding: clamp(16px, 2.4vw, 22px);
  background: rgba(11, 42, 36, 0.7);
  backdrop-filter: blur(6px);
}
.page-about .about-support__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(82, 255, 225, 0.45);
  padding-bottom: 2px;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .about-support__link:hover,
.page-about .about-support__link:focus-visible {
  color: var(--c-fog);
  border-bottom-color: var(--c-orange);
}
@media (min-width: 860px) {
  .page-about .about-support {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-figure--wide {
  margin-top: clamp(18px, 3vw, 26px);
}
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 3vw, 26px);
  background: var(--c-line);
  border: 1px solid var(--c-line);
}
.page-about .about-partner {
  padding: clamp(16px, 2.6vw, 24px);
  background: var(--c-ink-2);
}
.page-about .about-partner__num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-orange);
}
.page-about .about-partner__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--c-fog);
}
.page-about .about-partner__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--c-silver);
}
@media (min-width: 760px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .about-modes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(16px, 2.6vw, 22px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-mode {
  padding: 8px 13px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  border: 1px solid rgba(82, 255, 225, 0.5);
  background: rgba(82, 255, 225, 0.06);
}

/* ---------- 发展节奏 ---------- */
.page-about .about-road {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--c-line);
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}
.page-about .about-road__item {
  position: relative;
}
.page-about .about-road__item::before {
  content: "";
  position: absolute;
  left: -24.5px;
  top: 5px;
  width: 8px;
  height: 8px;
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(82, 255, 225, 0.14);
}
.page-about .about-road__item:last-child::before {
  background: var(--c-orange);
  box-shadow: 0 0 0 3px rgba(255, 122, 61, 0.16);
}
.page-about .about-road__stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--c-orange);
}
.page-about .about-road__title {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--c-fog);
}
.page-about .about-road__text {
  margin: 0;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--c-silver);
}

/* ---------- 更多链接与收尾 ---------- */
.page-about .about-more {
  margin: clamp(16px, 2.6vw, 22px) 0 0;
}
.page-about .about-more__link {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(82, 255, 225, 0.42);
  padding-bottom: 2px;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .about-more__link:hover,
.page-about .about-more__link:focus-visible {
  color: var(--c-fog);
  border-bottom-color: var(--c-orange);
}
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid var(--c-line);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(92, 31, 51, 0.5), transparent 60%),
    linear-gradient(135deg, rgba(43, 35, 80, 0.62), rgba(11, 42, 36, 0.9) 62%);
}
.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(1.3rem, 3.8vw, 2rem);
  line-height: 1.35;
  letter-spacing: 0.05em;
  color: var(--c-fog);
}
.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--c-silver);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-pillar,
  .page-about .about-device,
  .page-about .about-support__link,
  .page-about .about-more__link {
    transition: none;
  }
}