.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  --about-radius: var(--radius-lg);
  --about-rail-w: 210px;
  background: var(--bg);
  color: var(--text);
}

.page-about .breadcrumbs {
  padding-top: 18px;
  font-size: 13px;
  color: var(--text-muted);
}

.page-about .breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 52px) 0 clamp(32px, 5vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(53, 242, 208, .16), transparent 62%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 106, 42, .10), transparent 66%),
    linear-gradient(180deg, var(--ink-950), var(--bg) 78%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(169, 247, 230, .06) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: end;
}

.page-about .about-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-eyebrow .signal-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0 0 0 4px rgba(245, 213, 71, .18);
}

.page-about h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.4vw, 86px);
  line-height: .98;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about h1::after {
  content: "";
  display: block;
  width: 96px;
  height: 6px;
  margin-top: 18px;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--cyan), var(--teal));
}

.page-about .about-hero__intro {
  max-width: 46ch;
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--text-muted);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(11, 43, 36, .6);
}

.page-about .about-fact__num {
  font-family: var(--font-data);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .about-fact__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-muted);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--gray);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: clamp(28px, 4vw, 64px) clamp(40px, 6vw, 80px);
}

.page-about .about-rail {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gray);
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0 0 14px;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

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

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(53, 242, 208, .08);
}

.page-about .about-rail__cta {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12.5px;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px dashed rgba(255, 106, 42, .5);
  padding-bottom: 2px;
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(26px, 4vw, 52px);
  border-top: 1px solid var(--line);
}

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

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-head__no {
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-text p,
.page-about .about-lead {
  max-width: 60ch;
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .about-lead {
  color: var(--mist);
}

/* ---------- 方法 ---------- */
.page-about .about-method {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-steps {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.page-about .about-step {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-step:hover {
  border-left-color: var(--cyan);
  transform: translateX(3px);
}

.page-about .about-step__no {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--text-muted);
}

.page-about .about-method__figure {
  margin: 0;
}

.page-about .about-method__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}

.page-about .image-frame figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 团队 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.page-about .about-role {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(53, 242, 208, .07), rgba(11, 43, 36, .7) 55%);
  overflow: hidden;
}

.page-about .about-role summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  min-height: 44px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role summary::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-role summary:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: -3px;
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--paper);
}

.page-about .about-role__tag {
  margin-right: auto;
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-role__body {
  padding: 0 18px 18px;
}

.page-about .about-role__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-muted);
}

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

/* ---------- 里程碑 ---------- */
.page-about .about-section--dark {
  margin-top: 8px;
  padding: clamp(26px, 4vw, 48px) clamp(18px, 3vw, 36px);
  border-radius: var(--radius-xl);
  border-top: 0;
  background:
    radial-gradient(90% 100% at 100% 0%, rgba(14, 143, 125, .28), transparent 60%),
    var(--ink-950);
}

.page-about .about-milestones {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 242, 208, .12));
}

.page-about .about-timeline li {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink-950);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-timeline li:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(53, 242, 208, .16);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--yellow);
}

.page-about .about-timeline h3 {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-timeline p {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-spark-card {
  align-self: start;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(4, 22, 18, .7);
}

.page-about .about-spark-card__label {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-spark {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-spark polyline {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-spark__area {
  fill: rgba(53, 242, 208, .14);
  stroke: none;
}

.page-about .about-spark__axis {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-spark__dot {
  fill: var(--yellow);
}

.page-about .about-spark text {
  fill: var(--gray);
  font-family: var(--font-data);
  font-size: 9.5px;
}

.page-about .about-spark-card__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-coverage__figure {
  margin: 0;
}

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}

.page-about .about-coverage__text p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .about-partners {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0 0 14px;
  padding: 0;
}

.page-about .about-partners li {
  position: relative;
  padding: 12px 16px 12px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text-muted);
  background: rgba(11, 43, 36, .45);
}

.page-about .about-partners li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 20px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--teal);
}

.page-about .about-partners strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-inline-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, .4);
}

.page-about .about-inline-cta:hover,
.page-about .about-inline-cta:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 12px;
}

.page-about .about-principle {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(53, 242, 208, .09), rgba(11, 43, 36, .62) 60%);
  overflow: hidden;
}

.page-about .about-principle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--cyan);
}

.page-about .about-principle:nth-child(2)::before {
  background: var(--yellow);
}

.page-about .about-principle:nth-child(3)::before {
  background: var(--orange);
}

.page-about .about-principle__no {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gray);
}

.page-about .about-principle h3 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: clamp(32px, 5vw, 64px);
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(255, 106, 42, .18), transparent 58%),
    linear-gradient(140deg, var(--ink-800), var(--ink-950));
  overflow: hidden;
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-cta p {
  max-width: 52ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--text-muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-cta__links .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-method {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-milestones {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
  }

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

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    margin-bottom: 18px;
  }

  .page-about .about-rail__list a {
    border: 0;
    border-radius: 0;
    padding: 9px 0;
    min-height: 40px;
    position: relative;
  }

  .page-about .about-rail__list a::before {
    content: "";
    position: absolute;
    left: -17px;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 2px;
    height: 22px;
    background: var(--cyan);
    transition: transform .22s var(--ease);
  }

  .page-about .about-rail__list a:hover::before,
  .page-about .about-rail__list a:focus-visible::before {
    transform: translateY(-50%) scaleY(1);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: transparent;
    color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-rail__list a::before,
  .page-about .about-timeline li::before {
    transition: none;
  }

  .page-about .about-step:hover {
    transform: none;
  }
}
<<<END>>>