.page-about {
  --about-axis: 258px;
  --about-sticky: 96px;
  --about-gap: clamp(20px, 3vw, 48px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 3vw, 40px) clamp(40px, 6vw, 88px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(200, 255, 61, 0.09), transparent 58%),
    linear-gradient(180deg, var(--ink) 0%, #050d0a 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  padding: 6px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8vw, 5.2rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  max-width: 16ch;
}

.page-about .about-hero__mark {
  display: block;
  color: var(--lime);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.5vw, 28px) 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  color: var(--paper);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 46px);
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line-soft);
  list-style: none;
}

.page-about .about-hero__facts > li {
  display: grid;
  gap: 2px;
}

.page-about .about-hero__num {
  font-family: var(--font-data);
  font-size: clamp(1.9rem, 3.4vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-hero__label {
  font-size: 0.85rem;
  color: var(--muted);
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.58) brightness(0.88) contrast(1.08);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(46px, 7vw, 96px);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 28px);
  align-items: start;
  padding-top: clamp(16px, 2vw, 26px);
  border-top: 1px solid var(--line-soft);
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-chapter__index {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 3.4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__sub {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 0.95rem;
  color: var(--muted);
}

.page-about .about-prose {
  margin: 0 0 18px;
  max-width: 68ch;
  font-size: clamp(0.98rem, 1.3vw, 1.05rem);
}

.page-about .about-quote {
  margin: clamp(26px, 3vw, 38px) 0 0;
  padding: 22px 26px;
  max-width: 60ch;
  background: var(--panel);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: clamp(0.96rem, 1.3vw, 1.05rem);
  color: var(--paper);
}

.page-about .about-quote p {
  margin: 0;
}

/* ---------- 工作流 ---------- */
.page-about .about-chapter--flow {
  background: var(--frame);
  border-block: 1px solid var(--line-soft);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 48px);
}

.page-about .about-rail {
  position: relative;
  margin: 0 0 24px;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-rail > li {
  margin-bottom: 4px;
}

.page-about .about-rail a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.94rem;
  transition: background 180ms ease, color 180ms ease;
}

.page-about .about-rail a::before {
  content: "";
  position: absolute;
  left: -1px;
  width: 2px;
  height: 18px;
  margin-top: 4px;
  background: transparent;
  transition: background 180ms ease;
}

.page-about .about-rail a:hover,
.page-about .about-rail a:focus-visible {
  background: var(--hover);
  color: var(--lime);
}

.page-about .about-rail__no {
  font-size: 0.78rem;
  color: var(--muted);
}

.page-about .about-flow__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.5) brightness(0.82);
}

.page-about .about-flow__steps {
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 200ms ease, background 200ms ease;
}

.page-about .about-step[open] {
  border-color: var(--lime);
  background: var(--hover);
}

.page-about .about-step summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-step[open] summary::after {
  content: "–";
}

.page-about .about-step summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -4px;
}

.page-about .about-step__no {
  font-size: 0.8rem;
  color: var(--lime);
}

.page-about .about-step__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
}

.page-about .about-step__role {
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.page-about .about-step__body {
  padding: 0 18px 18px;
  font-size: 0.94rem;
  color: var(--paper);
}

.page-about .about-step__body p {
  margin: 0 0 10px;
  max-width: 62ch;
}

.page-about .about-step__out {
  font-family: var(--font-data);
  font-size: 0.82rem;
  color: var(--amber);
  letter-spacing: 0.02em;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-stat {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--panel);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-stat__name {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .about-stat p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.page-about .about-team__notes {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--hover), var(--frame));
}

.page-about .about-team__notes-title {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--lime);
  text-transform: uppercase;
}

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

.page-about .about-team__notes li {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.92rem;
  color: var(--paper);
}

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

/* ---------- 节奏 ---------- */
.page-about .about-chapter--cadence {
  background: linear-gradient(180deg, var(--ink), #08160f 60%, var(--ink));
}

.page-about .about-cadence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .about-cadence > li {
  background: var(--panel);
  padding: clamp(20px, 2.6vw, 32px);
}

.page-about .about-cadence__when {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-cadence h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
}

.page-about .about-cadence p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  max-width: 44ch;
}

/* ---------- 生态 ---------- */
.page-about .about-chapter--eco {
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-eco__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .about-eco__item {
  background: var(--frame);
  padding: clamp(20px, 2.6vw, 30px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
}

.page-about .about-eco__item--soft {
  background: var(--hover);
}

.page-about .about-eco__count {
  grid-row: span 2;
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-eco__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .about-eco__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-eco__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.45) brightness(0.8);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(44px, 6vw, 88px);
  background: var(--frame);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
  padding: clamp(26px, 4vw, 48px);
  background: var(--hover);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  line-height: 1.15;
}

.page-about .about-next__body p {
  margin: 0;
  max-width: 54ch;
  font-size: 0.96rem;
  color: var(--paper);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.page-about .about-next__link {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--mint);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--lime);
}

.page-about .about-next__extra {
  margin: 18px 0 0;
  font-size: 0.86rem;
  color: var(--muted);
}

.page-about .about-next__extra a {
  color: var(--mint);
  text-underline-offset: 4px;
}

.page-about .about-next__extra a:hover,
.page-about .about-next__extra a:focus-visible {
  color: var(--lime);
}

.page-about .num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

/* ---------- 动效 ---------- */
@keyframes about-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

.page-about .about-hero__eyebrow,
.page-about .about-hero__title,
.page-about .about-hero__lead,
.page-about .about-hero__facts {
  animation: about-rise 400ms ease-out both;
}

.page-about .about-hero__title { animation-delay: 60ms; }
.page-about .about-hero__lead { animation-delay: 120ms; }
.page-about .about-hero__facts { animation-delay: 180ms; }

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__eyebrow,
  .page-about .about-hero__title,
  .page-about .about-hero__lead,
  .page-about .about-hero__facts {
    animation: none;
  }
  .page-about .about-step,
  .page-about .about-rail a {
    transition: none;
  }
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 640px) {
  .page-about .about-team__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-eco__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
  }

  .page-about .about-hero__media img {
    aspect-ratio: 16 / 11;
  }

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

  .page-about .about-flow__rail {
    position: sticky;
    top: var(--about-sticky);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) 380px;
    align-items: start;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1200px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1fr) 440px;
  }
}
<<<END>>>