.page-about {
  --about-rail: 244px;
  --about-gap: clamp(28px, 4vw, 56px);
  --about-pad: clamp(40px, 6vw, 88px);
  background: var(--c-void);
  color: var(--c-paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(24px, 5vw, 64px)) 0 clamp(32px, 5vw, 64px);
  background:
    radial-gradient(circle at 82% 12%, rgba(61, 245, 208, .16), transparent 56%),
    radial-gradient(circle at 6% 4%, rgba(255, 106, 42, .13), transparent 46%),
    linear-gradient(180deg, #06090A 0%, #0C2B23 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(110, 143, 135, .16) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(110, 143, 135, .1) 0 1px, transparent 1px 96px);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero__copy .breadcrumb {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__copy .breadcrumb a {
  color: var(--c-silver);
  text-decoration: none;
}

.page-about .about-hero__copy .breadcrumb a:hover {
  color: var(--c-cyan);
}

.page-about .about-hero__copy .eyebrow {
  color: var(--c-cyan);
  margin: 0 0 12px;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--c-paper);
  max-width: 16em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 40px);
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-fact:nth-child(2) .about-fact__num {
  color: var(--c-orange);
}

.page-about .about-fact:nth-child(3) .about-fact__num {
  color: var(--c-amber);
}

.page-about .about-fact__unit {
  font-size: .55em;
  margin-left: .1em;
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--c-slate);
  clip-path: polygon(0 3%, 100% 0, 100% 100%, 0 97%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
  max-width: 100%;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 40px 16px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-silver);
  background: linear-gradient(180deg, transparent, rgba(6, 9, 10, .92));
}

.page-about .about-hero__stamp {
  position: absolute;
  top: 14px;
  right: 14px;
  transform: rotate(1.5deg);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 40px);
  padding-block: var(--about-pad);
}

.page-about .about-toc {
  border-top: 2px solid var(--c-cyan);
  padding-top: 14px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: block;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-silver);
  text-decoration: none;
  border: 1px solid var(--line);
  white-space: nowrap;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link.is-active {
  color: var(--c-void);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 96px);
  min-width: 0;
}

.page-about .about-section__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-section__head .eyebrow {
  color: var(--c-orange);
  margin: 0 0 10px;
}

.page-about .about-section h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  max-width: 20em;
}

.page-about .about-section h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-section p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-silver);
}

.page-about .about-section__lead {
  color: var(--c-silver);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__quote {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: clamp(16px, 2.6vw, 26px) clamp(16px, 2.6vw, 28px);
  border-left: 3px solid var(--c-cyan);
  background: linear-gradient(100deg, rgba(22, 58, 51, .85), rgba(6, 9, 10, .2));
  clip-path: polygon(0 0, 100% 2%, 100% 100%, 0 98%);
}

.page-about .about-origin__quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.55;
  color: var(--c-paper);
  letter-spacing: -0.01em;
}

/* ---------- 时间线 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  counter-reset: stage;
}

.page-about .about-stage {
  position: relative;
  background: linear-gradient(110deg, rgba(12, 43, 35, .92), rgba(6, 9, 10, .55));
  border: 1px solid var(--line);
  padding-left: 8px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--c-cyan);
  clip-path: polygon(0 0, 100% 6%, 100% 94%, 0 100%);
}

.page-about .about-stage:nth-child(even)::before {
  background: var(--c-orange);
}

.page-about .about-stage details {
  overflow: hidden;
}

.page-about .about-stage summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2.4vw, 26px);
  padding: clamp(14px, 2vw, 22px) clamp(14px, 2.4vw, 24px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(40px, 7vw, 78px);
  line-height: .78;
  color: transparent;
  -webkit-text-stroke: 1.4px var(--c-cyan);
  letter-spacing: -0.04em;
}

.page-about .about-stage:nth-child(even) .about-stage__num {
  -webkit-text-stroke-color: var(--c-orange);
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.1vw, 24px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  line-height: 1.3;
}

.page-about .about-stage__state {
  position: relative;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-strong);
  flex: 0 0 auto;
}

.page-about .about-stage__state::before,
.page-about .about-stage__state::after {
  content: "";
  position: absolute;
  background: var(--c-cyan);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.page-about .about-stage__state::before {
  left: 3px;
  right: 3px;
  top: 7px;
  height: 1.5px;
}

.page-about .about-stage__state::after {
  top: 3px;
  bottom: 3px;
  left: 7px;
  width: 1.5px;
}

.page-about .about-stage details[open] .about-stage__state::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .about-stage__body {
  padding: 0 clamp(14px, 2.4vw, 24px) clamp(16px, 2.2vw, 24px);
  border-top: 1px dashed var(--line);
  padding-top: 14px;
  margin-left: clamp(0px, 2vw, 8px);
}

.page-about .about-stage__body p {
  margin-bottom: 10px;
  font-size: 15px;
}

.page-about .about-stage__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-mist);
  margin: 0;
}

/* ---------- 团队带 ---------- */
.page-about .about-band {
  background:
    linear-gradient(165deg, rgba(12, 43, 35, .95) 0%, rgba(6, 9, 10, .9) 65%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 4vw, 48px) clamp(16px, 3vw, 32px);
  clip-path: polygon(0 1.2%, 100% 0, 100% 98.8%, 0 100%);
}

.page-about .about-band__inner {
  max-width: 1100px;
}

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-role {
  background: var(--c-void);
  padding: clamp(16px, 2.4vw, 24px);
  border-top: 3px solid var(--c-cyan);
}

.page-about .about-role--orange {
  border-top-color: var(--c-orange);
}

.page-about .about-role--silver {
  border-top-color: var(--c-silver);
}

.page-about .about-role--amber {
  border-top-color: var(--c-amber);
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1;
  margin: 0 0 10px;
  color: var(--c-cyan);
}

.page-about .about-role--orange .about-role__num {
  color: var(--c-orange);
}

.page-about .about-role--silver .about-role__num {
  color: var(--c-silver);
}

.page-about .about-role--amber .about-role__num {
  color: var(--c-amber);
}

.page-about .about-role__name {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.page-about .about-team__figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
  border: 1px solid var(--line);
  background: var(--c-slate);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-team__figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-mist);
  border-top: 1px solid var(--line);
}

/* ---------- 四步法 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  counter-reset: step;
}

.page-about .about-step {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(14px, 2vw, 22px);
  padding: clamp(16px, 2.2vw, 22px) clamp(14px, 2vw, 22px);
  background: rgba(22, 58, 51, .42);
  border: 1px solid var(--line);
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: calc(clamp(14px, 2vw, 22px) + 15px);
  bottom: -19px;
  width: 1px;
  height: 18px;
  background: var(--c-mist);
  opacity: .6;
}

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

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--c-void);
  background: var(--c-cyan);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  clip-path: polygon(0 0, 100% 12%, 100% 100%, 0 88%);
}

.page-about .about-step:nth-child(even) .about-step__num {
  background: var(--c-orange);
}

.page-about .about-step__body h3 {
  margin-bottom: 6px;
}

.page-about .about-step__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-silver);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-milestone {
  background: var(--c-void);
  padding: clamp(14px, 2vw, 22px);
}

.page-about .about-milestone--wide {
  grid-column: 1 / -1;
  background: linear-gradient(100deg, rgba(12, 43, 35, .95), rgba(6, 9, 10, .9));
  border-left: 3px solid var(--c-cyan);
}

.page-about .about-milestone__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5vw, 64px);
  line-height: .95;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
}

.page-about .about-milestone:nth-child(3) .about-milestone__num,
.page-about .about-milestone:nth-child(5) .about-milestone__num {
  color: var(--c-orange);
}

.page-about .about-milestone:nth-child(4) .about-milestone__num {
  color: var(--c-amber);
}

.page-about .about-milestone__unit {
  font-size: .5em;
  margin-left: .08em;
}

.page-about .about-milestone__label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-silver);
  max-width: 24em;
}

.page-about .about-milestones__figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border: 1px solid var(--line);
  background: var(--c-slate);
}

.page-about .about-milestones__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-milestones__figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-mist);
  border-top: 1px solid var(--line);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(12px, 2vw, 20px);
}

.page-about .about-partner {
  padding: clamp(16px, 2.2vw, 22px);
  background: linear-gradient(120deg, rgba(22, 58, 51, .55), rgba(6, 9, 10, .3));
  border: 1px solid var(--line);
  border-left: 2px solid var(--c-orange);
  clip-path: polygon(0 0, 100% 2.5%, 100% 100%, 0 97.5%);
}

.page-about .about-partner__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  color: var(--c-orange);
}

.page-about .about-partner h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

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

.page-about .about-partners__note {
  margin-top: 16px;
  font-size: 14.5px;
  color: var(--c-silver);
}

.page-about .about-partners__note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 208, .45);
}

.page-about .about-partners__note a:hover {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

/* ---------- 气质 ---------- */
.page-about .about-culture__board {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(16px, 2.4vw, 24px) 0;
  padding: clamp(18px, 3vw, 28px);
  background:
    repeating-linear-gradient(0deg, rgba(110, 143, 135, .12) 0 1px, transparent 1px 34px),
    linear-gradient(140deg, rgba(12, 43, 35, .9), rgba(6, 9, 10, .75));
  border: 1px solid var(--line);
}

.page-about .about-culture__chip {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  padding: 8px 14px;
  color: var(--c-void);
  background: var(--c-paper);
  clip-path: polygon(0 0, 100% 8%, 100% 100%, 0 92%);
  box-shadow: var(--shadow-stack);
}

.page-about .about-culture__chip--1,
.page-about .about-culture__chip--4 {
  background: var(--c-cyan);
  transform: rotate(-1.5deg);
}

.page-about .about-culture__chip--2,
.page-about .about-culture__chip--5 {
  background: var(--c-paper);
  transform: rotate(1deg);
}

.page-about .about-culture__chip--3,
.page-about .about-culture__chip--6 {
  background: var(--c-amber);
  transform: rotate(-.6deg);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: clamp(24px, 4vw, 40px) 0 clamp(8px, 2vw, 16px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta .eyebrow {
  color: var(--c-cyan);
  margin: 0 0 10px;
}

.page-about .about-cta h2 {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  display: inline-block;
  padding: 11px 20px;
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius);
  transition: transform 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-cta__actions .btn:hover {
  transform: translateY(-1px);
}

.page-about .about-cta__actions .btn--primary {
  background: var(--c-orange);
  color: var(--c-void);
  border: 1px solid var(--c-orange);
}

.page-about .about-cta__actions .btn--primary:hover {
  background: var(--c-amber);
  border-color: var(--c-amber);
}

.page-about .about-cta__actions .btn--ghost {
  background: transparent;
  color: var(--c-silver);
  border: 1px solid var(--line-strong);
}

.page-about .about-cta__actions .btn--ghost:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-milestone--wide {
    grid-column: span 2;
    grid-row: span 2;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: 55fr 45fr;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 6px 0 6px 12px;
    background: none;
    color: var(--c-silver);
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link.is-active {
    color: var(--c-cyan);
    background: none;
    border-left-color: var(--c-cyan);
  }

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-step::after {
    display: none;
  }

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

  .page-about .about-milestones__figure {
    max-width: 720px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__figure {
    margin-top: 8px;
  }

  .page-about .about-stage summary {
    padding-right: clamp(20px, 3vw, 36px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-culture__chip,
  .page-about .about-hero__stamp {
    transform: none;
  }

  .page-about .about-cta__actions .btn:hover {
    transform: none;
  }
}