.page-about {
  background: var(--bg);
  color: var(--text);
}

.page-about .container {
  max-width: var(--shell);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 82px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--bright);
}

.page-about .about-hero__kicker {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(13px, 2.4vw, 16px);
  letter-spacing: 0.22em;
  color: var(--lime);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 2px;
  margin-top: 26px;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
}

.page-about .about-hero__lead {
  margin: 26px 0 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__side {
  min-width: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__side-label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .hero-jump-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .hero-jump {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 12px 11px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text);
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .hero-jump__num {
  flex: none;
  font-size: 12px;
  color: var(--cyan);
}

.page-about .hero-jump__text {
  font-size: 15px;
  line-height: 1.5;
}

.page-about .hero-jump:hover,
.page-about .hero-jump:focus-visible {
  color: var(--bright);
  padding-left: 8px;
}

.page-about .hero-jump:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 开篇 ---------- */
.page-about .about-intro {
  padding: 56px 0 8px;
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-intro__title {
  margin: 0 0 20px;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.4;
  font-weight: 700;
  color: var(--bright);
}

.page-about .about-intro__body p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-quote {
  margin: 0;
  padding: 22px 20px;
  border-left: 2px solid var(--cyan);
  background: var(--panel);
}

.page-about .about-quote p {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--bright);
}

.page-about .about-quote__from {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 区块标题统一处理 ---------- */
.page-about .section {
  padding: 56px 0;
}

.page-about .section--tight {
  padding: 40px 0;
}

.page-about .section-head {
  margin-bottom: 32px;
  max-width: 760px;
}

.page-about .section-head__index {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .section-head__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 5vw, 38px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bright);
}

.page-about .section-head__meta {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 阶段轴 ---------- */
.page-about .stage-section {
  background: linear-gradient(180deg, rgba(19, 27, 46, 0.72), rgba(5, 7, 14, 0));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stage-visual {
  margin: 0 0 32px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .stage-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .stage-visual .media-frame__caption {
  display: block;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  background: var(--panel);
  border-top: 1px solid var(--line);
}

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

.page-about .stage {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0 18px 0;
  border-top: 1px solid var(--line);
  outline: none;
  transition: background 160ms var(--ease);
}

.page-about .stage:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .stage__num {
  position: relative;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  transition: color 160ms var(--ease);
}

.page-about .stage__num::after {
  content: "";
  position: absolute;
  left: 15px;
  top: 22px;
  width: 1px;
  height: calc(100% + 18px);
  background: var(--line);
}

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

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

.page-about .stage__title {
  margin: 0 0 6px;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--bright);
}

.page-about .stage__summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .stage__detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 200ms var(--ease), opacity 200ms var(--ease), margin-top 200ms var(--ease);
}

.page-about .stage__detail p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  border-left: 2px solid var(--line);
  padding-left: 12px;
}

.page-about .stage:hover,
.page-about .stage:focus-within,
.page-about .stage:focus-visible {
  background: linear-gradient(90deg, rgba(47, 227, 224, 0.07), rgba(47, 227, 224, 0));
}

.page-about .stage:hover .stage__num,
.page-about .stage:focus .stage__num,
.page-about .stage:focus-visible .stage__num {
  color: var(--cyan);
}

.page-about .stage:hover .stage__detail,
.page-about .stage:focus .stage__detail,
.page-about .stage:focus-visible .stage__detail {
  max-height: 220px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .stage:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

/* ---------- 规模数据带 ---------- */
.page-about .scale-band {
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .scale-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(47, 227, 224, 0.1), rgba(5, 7, 14, 0) 46%),
    repeating-linear-gradient(90deg, rgba(31, 42, 63, 0.55) 0 1px, transparent 1px 64px);
  pointer-events: none;
}

.page-about .scale-band__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .scale-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--panel);
  min-width: 0;
}

.page-about .scale-cell__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 40px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .scale-cell__unit {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--cyan);
}

.page-about .scale-cell__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .scale-figure {
  margin: 0;
  position: relative;
  min-width: 0;
  background: var(--raised);
}

.page-about .scale-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .scale-figure .media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--bright);
  background: rgba(5, 7, 14, 0.82);
  border-top: 1px solid var(--line);
}

.page-about .scale-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 76ch;
}

.page-about .kbd {
  display: inline-block;
  padding: 1px 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--bright);
  border: 1px solid var(--line);
  background: var(--raised);
  border-radius: 2px;
}

/* ---------- 流程 ---------- */
.page-about .workflow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 12px 16px 0;
  border-bottom: 1px solid var(--line);
  outline: none;
  transition: background 160ms var(--ease);
}

.page-about .flow__step:first-child {
  border-top: 1px solid var(--line);
}

.page-about .flow__num {
  font-size: 13px;
  font-weight: 600;
  color: var(--lime);
  padding-top: 3px;
}

.page-about .flow__title {
  margin: 0 0 5px;
  font-size: 17px;
  font-weight: 700;
  color: var(--bright);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .flow__step:hover,
.page-about .flow__step:focus-visible {
  background: linear-gradient(90deg, rgba(184, 255, 60, 0.08), rgba(184, 255, 60, 0));
}

.page-about .flow__step:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .workflow-aside {
  align-self: start;
  padding: 22px 20px;
  background: var(--raised);
  border-left: 2px solid var(--lime);
}

.page-about .workflow-aside__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .workflow-aside p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .btn {
  display: inline-block;
  padding: 10px 18px;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  background: transparent;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  background: var(--cyan);
  color: var(--bg);
}

.page-about .btn--quiet {
  border-color: var(--line);
  color: var(--bright);
}

.page-about .btn--quiet:hover,
.page-about .btn--quiet:focus-visible {
  background: var(--bright);
  border-color: var(--bright);
  color: var(--bg);
}

.page-about .btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* ---------- 团队 ---------- */
.page-about .team-section {
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(11, 17, 32, 0.9), rgba(5, 7, 14, 0.2));
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .team-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .role {
  padding: 18px 16px;
  background: var(--panel);
  min-width: 0;
  transition: background 160ms var(--ease);
}

.page-about .role:hover {
  background: var(--raised);
}

.page-about .role__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--bright);
}

.page-about .role__desc {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .role__meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .team-figure {
  margin: 0;
  align-self: start;
  border: 1px solid var(--line);
  background: var(--raised);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 2 / 1;
}

.page-about .team-figure .media-frame__caption {
  display: block;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .team-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
}

.page-about .team-foot p {
  margin: 0;
  flex: 1 1 320px;
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .next-section {
  border-top: 1px solid var(--line-soft);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .next-card {
  display: block;
  padding: 24px 20px;
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  transition: transform 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .next-card__num {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .next-card__title {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--bright);
}

.page-about .next-card__desc {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .next-card__go {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-3px);
  background: var(--raised);
  border-color: var(--cyan);
}

.page-about .next-card--accent {
  border-top-color: var(--magenta);
}

.page-about .next-card--accent .next-card__go {
  color: var(--magenta);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .next-note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .next-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 224, 0.45);
}

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

/* ---------- 内容显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .stage__detail {
    transition: none;
  }
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 44px;
    padding: 64px 0 72px;
  }

  .page-about .about-hero__side {
    padding: 4px 0 0 24px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 44px;
  }

  .page-about .about-intro__body p {
    font-size: 17px;
  }

  .page-about .stage {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 24px;
    padding: 22px 0;
  }

  .page-about .stage__num {
    font-size: 15px;
  }

  .page-about .stage__num::after {
    left: 21px;
  }

  .page-about .stage__title {
    font-size: 21px;
  }

  .page-about .scale-band__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .scale-figure img {
    height: 100%;
    aspect-ratio: auto;
  }

  .page-about .workflow-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 36px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
  }

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

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

  .page-about .next-card {
    padding: 30px 26px;
  }
}

@media (min-width: 1100px) {
  .page-about .section {
    padding: 76px 0;
  }

  .page-about .section--tight {
    padding: 52px 0;
  }

  .page-about .scale-cell {
    padding: 22px 22px;
  }

  .page-about .team-figure {
    position: sticky;
    top: 104px;
  }
}

@media (max-width: 420px) {
  .page-about .scale-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .team-foot {
    flex-direction: column;
    align-items: flex-start;
  }
}
<<<PAGE_CSS_END>>>