.page-about {
  background: var(--ink);
  color: var(--chalk);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line-dark);
  background:
    radial-gradient(120% 88% at 84% 16%, rgba(30, 122, 80, 0.3), rgba(10, 26, 43, 0) 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  padding-block: calc(var(--header-h) + clamp(52px, 10vw, 116px)) clamp(68px, 10vw, 128px);
}

.page-about .about-hero__wedge {
  position: absolute;
  right: -14%;
  bottom: -34%;
  width: min(820px, 94%);
  height: min(560px, 96%);
  background: linear-gradient(158deg, rgba(30, 122, 80, 0.44), rgba(20, 86, 58, 0) 72%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: -1;
}

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

.page-about .breadcrumbs {
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(22px, 3vw, 36px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(46px, 10vw, 132px);
  line-height: 0.94;
  letter-spacing: 0.01em;
  color: var(--chalk);
  max-width: 14ch;
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(34px, 5vw, 56px);
  max-width: 48ch;
  font-size: clamp(15.5px, 1.6vw, 18.5px);
  line-height: 1.8;
  color: rgba(232, 238, 244, 0.82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  max-width: 660px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-fact {
  padding: clamp(16px, 2.4vw, 24px) clamp(12px, 2vw, 20px);
  border-left: 1px solid var(--line-dark);
}

.page-about .about-fact:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-about .about-fact dt {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--grey);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--chalk);
}

.page-about .about-fact dd span {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  padding-block: clamp(60px, 9vw, 116px) clamp(88px, 13vw, 184px);
}

.page-about .about-stream {
  min-width: 0;
}

/* ---------- 章节目录 ---------- */
.page-about .about-index {
  display: none;
}

.page-about .about-index__title {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--grey);
  text-transform: uppercase;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-index__item {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0 13px 12px;
  border-left: 2px solid transparent;
  color: var(--grey);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
  transition: color 0.3s var(--ease-out), border-color 0.3s var(--ease-out), padding-left 0.3s var(--ease-out);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--chalk);
  border-left-color: var(--signal);
  padding-left: 16px;
}

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

/* ---------- 章节 ---------- */
.page-about .chapter {
  position: relative;
  padding-block: clamp(68px, 11vw, 152px);
  border-top: 1px solid var(--line-dark);
}

.page-about .chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .chapter--final {
  padding-bottom: 0;
}

.page-about .chapter__head {
  position: relative;
}

.page-about .chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(64px, 13vw, 152px);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: rgba(46, 211, 198, 0.09);
  -webkit-text-stroke: 1.5px rgba(46, 211, 198, 0.5);
}

.page-about .chapter__title {
  position: relative;
  z-index: 1;
  margin: clamp(-46px, -4vw, -26px) 0 0 clamp(0px, 3vw, 44px);
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 56px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .chapter__body {
  margin-top: clamp(26px, 4vw, 46px);
  max-width: 64ch;
}

.page-about .chapter__body p {
  margin: 0 0 1.15em;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(232, 238, 244, 0.84);
}

.page-about .chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .chapter__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .chapter__grid .chapter__body {
  margin-top: 0;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.05);
}

.page-about .about-figure--full img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(10, 26, 43, 0) 40%, rgba(10, 26, 43, 0.8) 100%);
}

.page-about .about-figure__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  margin: 0;
  padding: clamp(14px, 2vw, 20px);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: rgba(232, 238, 244, 0.92);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(38px, 6vw, 68px) 0 0;
  padding: 0 0 0 32px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(46, 211, 198, 0.05));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 9px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(232, 238, 244, 0.8);
}

/* ---------- 三块主业 ---------- */
.page-about .pillars {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line-dark);
}

.page-about .pillar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--ink-2);
}

.page-about .pillar__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 1.8vw, 23px);
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--chalk);
}

.page-about .pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 238, 244, 0.76);
}

/* ---------- 数据格 ---------- */
.page-about .metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
  border-left: 1px solid var(--line-dark);
}

.page-about .metric {
  padding: clamp(16px, 2.4vw, 24px) clamp(14px, 2vw, 20px);
  border-right: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .metric dt {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--grey);
}

.page-about .metric dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1;
  color: var(--chalk);
}

.page-about .metric dd span {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

/* ---------- 玻璃说明块 ---------- */
.page-about .glass-note {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--glass-brd);
  border-radius: var(--radius);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
}

.page-about .glass-note p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: rgba(232, 238, 244, 0.9);
}

.page-about .glass-note .num {
  font-family: var(--font-mono);
  font-size: 1.16em;
  color: var(--cyan);
}

/* ---------- 流程四步 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .flow__step {
  padding: clamp(20px, 2.6vw, 28px) clamp(16px, 2vw, 22px);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .flow__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--chalk);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(232, 238, 244, 0.75);
}

/* ---------- 状态提示 ---------- */
.page-about .notice {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--glass-brd);
  border-left: 2px solid var(--signal);
  border-radius: var(--radius);
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
}

.page-about .notice__line {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(232, 238, 244, 0.86);
}

.page-about .notice__line + .notice__line {
  margin-top: 10px;
}

.page-about .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin: 0 4px 0 2px;
  border-radius: 50%;
  vertical-align: middle;
}

.page-about .dot--live {
  background: var(--turf);
  box-shadow: 0 0 0 3px rgba(30, 122, 80, 0.22);
}

.page-about .dot--busy {
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.22);
}

/* ---------- 合作名录 ---------- */
.page-about .partners {
  list-style: none;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .partner {
  display: flex;
  align-items: baseline;
  gap: clamp(16px, 3vw, 36px);
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .partner__num {
  flex: none;
  min-width: 2.4ch;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
  color: var(--signal);
}

.page-about .partner__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: rgba(232, 238, 244, 0.82);
}

.page-about .chapter__aside {
  margin: clamp(26px, 4vw, 40px) 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--grey);
}

.page-about .chapter__aside .num {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--chalk);
}

/* ---------- 结尾 ---------- */
.page-about .closing-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .closing-note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--grey);
}

.page-about .closing-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 211, 198, 0.35);
  transition: color 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.page-about .closing-note a:hover,
.page-about .closing-note a:focus-visible {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
}

.page-about .chapter--final .about-figure {
  margin-top: clamp(26px, 4vw, 44px);
}

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .about-fact:first-child {
    border-top: 0;
  }
}

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

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

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .flow__step {
    border-left: 0;
    border-radius: 0;
  }

  .page-about .flow__step:first-child {
    border-left: 1px solid var(--line-dark);
    border-radius: var(--radius) 0 0 var(--radius);
  }

  .page-about .flow__step:last-child {
    border-radius: 0 var(--radius) var(--radius) 0;
  }
}

@media (min-width: 900px) {
  .page-about .chapter__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .chapter__grid .about-figure {
    margin-top: clamp(4px, 1vw, 14px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(48px, 7vw, 120px);
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 36px);
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .closing-note a {
    transition: none;
  }
}