.page-about {
  --about-pad: 20px;
  --about-line-soft: 1px solid rgba(22, 57, 79, 0.9);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--about-pad);
}

.page-about .about-lead {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.8;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 38px;
  border-bottom: 2px solid var(--deep-line);
  background:
    radial-gradient(130% 92% at 88% -12%, rgba(30, 127, 140, 0.36), transparent 62%),
    linear-gradient(192deg, var(--ink-950) 0%, var(--ink-900) 72%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  bottom: -12%;
  right: 18%;
  width: 2px;
  background: linear-gradient(180deg, transparent, var(--teal) 28%, var(--signal) 72%, transparent);
  transform: skewX(-8deg);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(29px, 8.2vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-hero__title span {
  display: block;
  margin-top: 0.32em;
  font-size: 0.46em;
  line-height: 1.35;
  letter-spacing: 0;
  color: var(--sand);
}

.page-about .about-hero__lead {
  max-width: 58ch;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 247, 248, 0.86);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__board {
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: var(--deep);
  box-shadow: var(--hard-shadow);
  overflow: hidden;
}

.page-about .about-board__label {
  margin: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sand);
  border-bottom: 2px solid var(--deep-line);
  background: rgba(4, 18, 29, 0.6);
}

.page-about .about-board__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--deep-line);
}

.page-about .about-board__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 12px;
  background: var(--deep);
}

.page-about .about-board__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 6vw, 32px);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-board__item:nth-child(1) .about-board__num {
  color: var(--signal);
}

.page-about .about-board__text {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 定位 ---------- */
.page-about .about-pos__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-pos__text p {
  margin: 0 0 16px;
  font-size: 16px;
}

.page-about .about-pos__text .callout {
  margin-top: 22px;
}

.page-about .about-pos__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
  background: var(--deep-line);
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
}

.page-about .about-pos__item {
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-pos__k {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-950);
  background: var(--sand);
  border-radius: var(--radius);
}

.page-about .about-pos__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(244, 247, 248, 0.84);
}

/* ---------- 版本 ---------- */
.page-about .about-archive__stack {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border-bottom: var(--about-line-soft);
}

.page-about .about-archive__layer {
  display: grid;
  gap: 12px;
  padding: 22px 0;
  border-top: var(--about-line-soft);
}

.page-about .about-archive__code {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 5vw, 32px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--sand);
}

.page-about .about-archive__title {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-archive__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 247, 248, 0.82);
}

.page-about .about-archive__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  align-content: start;
}

.page-about .about-archive__layer--v3 .about-archive__code {
  color: var(--signal);
}

.page-about .about-archive__layer--v3 {
  background: linear-gradient(90deg, rgba(255, 90, 54, 0.08), transparent 70%);
  padding-left: 14px;
  border-left: 2px solid var(--signal);
}

.page-about .about-archive__foot {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-archive__foot a {
  color: var(--teal-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 成长阶段 ---------- */
.page-about .about-stages {
  background:
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 40%, var(--ink-900) 100%);
  border-top: 2px solid var(--deep-line);
  border-bottom: 2px solid var(--deep-line);
}

.page-about .about-stages__grid {
  display: grid;
  gap: 24px;
  margin-top: 34px;
}

.page-about .about-stages__rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-stages__rail .rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-stages__rail .rail__item {
  flex: 0 0 auto;
}

.page-about .about-stages__rail .rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: var(--ink-800);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease-out, border-color 180ms ease-out, background 180ms ease-out;
}

.page-about .about-stages__rail .rail__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--sand);
}

.page-about .about-stages__rail .rail__link:hover,
.page-about .about-stages__rail .rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--teal);
}

.page-about .about-stages__rail .rail__link.is-active,
.page-about .about-stages__rail .rail__link[aria-current="true"] {
  color: var(--ink-950);
  background: var(--sand);
  border-color: var(--sand);
}

.page-about .about-stages__rail .rail__link.is-active .rail__num,
.page-about .about-stages__rail .rail__link[aria-current="true"] .rail__num {
  color: var(--signal-deep);
}

.page-about .about-stages__flow {
  display: grid;
  gap: 4px;
}

.page-about .stage {
  position: relative;
  padding: 6px 0 26px 24px;
  border-left: 2px solid var(--deep-line);
}

.page-about .stage:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 12px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--teal);
  border: 2px solid var(--ink-900);
  transition: background 200ms ease-out, box-shadow 200ms ease-out;
}

.page-about .stage.is-active::before {
  background: var(--signal);
  box-shadow: 0 0 0 5px rgba(255, 90, 54, 0.16);
}

.page-about .stage__title {
  margin: 0 0 8px;
  font-size: clamp(20px, 4.2vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.page-about .stage__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 248, 0.82);
}

.page-about .stage__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.page-about .stage__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .stage__stat-v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1;
  color: var(--sand);
}

.page-about .stage__stat-l {
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-stages__banner {
  margin: 36px 0 0;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: var(--hard-shadow);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .about-figure__cap {
  margin: 0;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--deep-line);
  background: rgba(4, 18, 29, 0.55);
}

/* ---------- 团队 ---------- */
.page-about .about-team__banner {
  margin: 30px 0 0;
}

.page-about .about-team__chart {
  margin: 32px 0 28px;
  padding: 18px 14px 12px;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: linear-gradient(165deg, var(--ink-800), var(--ink-950));
}

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

.page-about .about-team__name {
  font-family: var(--font-mono);
  font-size: 15px;
  fill: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-team__line {
  fill: none;
  stroke-linecap: round;
  transition: stroke-width 200ms ease-out, opacity 200ms ease-out;
}

.page-about .about-team__line--a {
  stroke: var(--teal);
  stroke-width: 4;
}

.page-about .about-team__line--b {
  stroke: var(--signal);
  stroke-width: 7;
}

.page-about .about-team__line--c {
  stroke: var(--sand);
  stroke-width: 5;
}

.page-about .about-team__line:hover {
  stroke-width: 11;
}

.page-about .about-team__node {
  fill: var(--paper);
}

.page-about .about-team__chart-note {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-team__cards {
  display: grid;
  gap: 16px;
}

.page-about .about-team__card {
  padding: 20px 18px;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color 180ms ease-out, transform 180ms ease-out, box-shadow 180ms ease-out;
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  border-color: var(--signal);
  transform: translateY(-2px);
  box-shadow: var(--hard-shadow);
}

.page-about .about-team__card-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 34px;
  line-height: 1;
  color: var(--sand);
}

.page-about .about-team__card-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244, 247, 248, 0.82);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-rhythm__steps {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
  background: var(--deep-line);
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
}

.page-about .about-rhythm__step {
  display: grid;
  gap: 6px;
  padding: 16px;
  background: var(--ink-800);
}

.page-about .about-rhythm__time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-about .about-rhythm__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 247, 248, 0.84);
}

.page-about .about-rhythm__media {
  align-self: start;
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  border-top: 2px solid var(--deep-line);
}

.page-about .about-coverage__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-coverage__info p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 248, 0.84);
}

.page-about .about-coverage__legend {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-coverage__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-coverage__key {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  border-radius: 1px;
  background: rgba(30, 127, 140, 0.7);
}

.page-about .about-coverage__key--hot {
  background: var(--signal);
  box-shadow: 0 0 8px rgba(255, 90, 54, 0.6);
}

.page-about .about-coverage__map {
  padding: 22px 18px;
  border: 2px solid var(--deep-line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--deep), var(--ink-950));
  box-shadow: var(--hard-shadow);
}

.page-about .about-coverage__dots {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  max-width: 260px;
}

.page-about .about-coverage__dot {
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 1px;
  background: rgba(30, 127, 140, 0.55);
}

.page-about .about-coverage__dot.is-hot {
  background: var(--signal);
  box-shadow: 0 0 8px rgba(255, 90, 54, 0.55);
}

.page-about .about-coverage__count {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-coverage__count .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  color: var(--sand);
  margin-right: 4px;
}

/* ---------- 开放能力 ---------- */
.page-about .about-open__list {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-open__item {
  padding: 16px 16px 16px 18px;
  border-left: 2px solid var(--teal);
  background: rgba(12, 44, 66, 0.55);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-open__k {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sand);
}

.page-about .about-open__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(244, 247, 248, 0.84);
}

.page-about .about-open__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 2px solid var(--deep-line);
}

.page-about .about-open__note {
  flex: 1 1 240px;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 768px) {
  .page-about {
    --about-pad: 32px;
  }

  .page-about .about-hero {
    padding: 40px 0 54px;
  }

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

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

  .page-about .about-archive__layer {
    grid-template-columns: 88px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-about .about-archive__tags {
    grid-column: 2;
  }

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

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

  .page-about .about-coverage__dots {
    grid-template-columns: repeat(13, minmax(0, 1fr));
    max-width: 420px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 56px 0 80px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 0.85fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero__board {
    align-self: end;
  }

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

  .page-about .about-pos__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-archive__layer {
    grid-template-columns: 104px minmax(0, 1fr) 220px;
    gap: 32px;
    padding: 26px 0;
  }

  .page-about .about-archive__tags {
    grid-column: 3;
    justify-content: flex-start;
  }

  .page-about .about-archive__layer--v3 {
    padding-left: 20px;
  }

  .page-about .about-stages__grid {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-stages__rail {
    position: sticky;
    top: calc(var(--header-h) + 16px);
    align-self: start;
  }

  .page-about .about-stages__rail .rail__list {
    flex-direction: column;
    overflow-x: visible;
    gap: 4px;
  }

  .page-about .about-stages__rail .rail__link {
    width: 100%;
    padding: 10px 12px;
  }

  .page-about .stage {
    padding: 6px 0 40px 32px;
  }

  .page-about .stage__stats {
    margin-top: 20px;
  }

  .page-about .about-rhythm__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.7fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-team__chart {
    padding: 24px 24px 16px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-team__line,
  .page-about .stage::before,
  .page-about .about-stages__rail .rail__link {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: none;
  }
}
<<<END>>>