.page-about {
  --about-gutter: clamp(16px, 4vw, 40px);
  --about-rail-w: 232px;
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 18px 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
}
.page-about .breadcrumb a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    linear-gradient(180deg, rgba(63, 240, 196, 0.07) 0%, rgba(63, 240, 196, 0) 62%),
    var(--ink);
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 5vw, 56px) 0 clamp(32px, 5vw, 56px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(63, 240, 196, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(63, 240, 196, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint);
  border: 1px solid var(--line);
  padding: 6px 12px;
  margin: 0 0 20px;
}
.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 22em;
}
.page-about .about-lede {
  margin: 0;
  max-width: 38rem;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.88;
  border-left: 2px solid var(--orange);
  padding-left: 16px;
}
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-figure {
  background: var(--ink-2);
  padding: clamp(14px, 2.4vw, 22px) clamp(12px, 2vw, 20px);
}
.page-about .about-figure dt {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mute);
}
.page-about .about-figure dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.page-about .about-figure .display-num {
  font-family: var(--font-mark);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 54px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}
.page-about .about-figure-unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
}

/* ---------- 左轨 + 正文骨架 ---------- */
.page-about .about-rail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(36px, 6vw, 72px);
}
.page-about .about-rail {
  min-width: 0;
}
.page-about .about-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}
.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}
.page-about .about-rail-list::-webkit-scrollbar {
  display: none;
}
.page-about .about-rail-list li {
  flex: 0 0 auto;
}
.page-about .about-rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--mute);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}
.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--ink);
  background: var(--mint);
  border-color: var(--mint);
}
.page-about .about-rail-dot {
  width: 6px;
  height: 6px;
  background: currentColor;
  flex: 0 0 auto;
}

/* ---------- 阶段段落 ---------- */
.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 7vw, 88px);
}
.page-about .about-stage {
  min-width: 0;
  scroll-margin-top: 120px;
}
.page-about .about-stage-head {
  margin-bottom: clamp(18px, 3vw, 28px);
}
.page-about .about-stage-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 4.4vw, 34px);
  line-height: 1.28;
  color: var(--paper);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--mint);
}
.page-about .about-stage-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.6vw, 36px);
}
.page-about .about-stage-text,
.page-about .about-stage-body--single {
  min-width: 0;
}
.page-about .prose {
  margin: 0 0 18px;
  max-width: 38rem;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.85;
  color: var(--paper);
  opacity: 0.9;
}
.page-about .prose:last-child {
  margin-bottom: 0;
}
.page-about .about-aside {
  margin: 22px 0 0;
  max-width: 38rem;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mute);
  background: var(--ink-2);
  border-left: 3px solid var(--orange);
}

/* ---------- 图位 ---------- */
.page-about .about-stage-media {
  min-width: 0;
}
.page-about .about-stage-media--inline {
  margin: clamp(22px, 3.6vw, 34px) 0;
}
.page-about .media-frame {
  border: 1px solid var(--line);
  background-color: var(--ink-2);
  overflow: hidden;
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队比例条 ---------- */
.page-about .about-ratio {
  margin: 26px 0;
  max-width: 38rem;
}
.page-about .about-ratio-bar {
  display: flex;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
  min-height: 52px;
}
.page-about .about-ratio-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink);
  transition: transform 0.2s ease, filter 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
}
.page-about .about-ratio-seg b {
  font-weight: 800;
  font-size: 15px;
}
.page-about .about-ratio-seg--data { background: var(--mint); }
.page-about .about-ratio-seg--write { background: var(--blue); }
.page-about .about-ratio-seg--ops { background: var(--lime); }
.page-about .about-ratio-seg:hover {
  filter: brightness(1.12);
}
.page-about .about-ratio-key {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 12px 0 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--mute);
}
.page-about .about-ratio-key-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.page-about .about-ratio-chip {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
}
.page-about .about-ratio-key-item--data .about-ratio-chip { background: var(--mint); }
.page-about .about-ratio-key-item--write .about-ratio-chip { background: var(--blue); }
.page-about .about-ratio-key-item--ops .about-ratio-chip { background: var(--lime); }

/* ---------- 三步流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  max-width: 38rem;
}
.page-about .about-step {
  background: var(--ink-2);
  padding: clamp(16px, 3vw, 24px);
  position: relative;
}
.page-about .about-step-num {
  display: block;
  font-family: var(--font-mark);
  font-weight: 800;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
  margin-bottom: 12px;
}
.page-about .about-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  color: var(--paper);
}
.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

/* ---------- 覆盖点阵 ---------- */
.page-about .about-coverage-figure {
  margin: 30px 0;
  padding: clamp(18px, 3.4vw, 30px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  max-width: 38rem;
}
.page-about .about-dots {
  display: block;
  width: 100%;
  height: auto;
  max-width: 320px;
}
.page-about .about-dots rect {
  transition: transform 0.18s ease, opacity 0.18s ease;
  transform-box: fill-box;
  transform-origin: center;
}
.page-about .about-dots rect:hover {
  transform: scale(1.55);
  opacity: 1;
}
.page-about .about-coverage-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--mute);
}
.page-about .about-coverage-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.page-about .about-legend-swatch {
  width: 11px;
  height: 11px;
}
.page-about .about-legend-swatch--deep { background: var(--orange); }
.page-about .about-legend-swatch--base { background: var(--mint); opacity: 0.55; }

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 26px 0;
}
.page-about .about-cadence-item {
  background: var(--ink-2);
  padding: clamp(16px, 3vw, 24px);
}
.page-about .about-cadence-item--hot {
  background: var(--orange-bg);
}
.page-about .about-cadence-num {
  margin: 14px 0 8px;
  font-family: var(--font-mark);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.page-about .about-cadence-num span {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
  margin-left: 6px;
}
.page-about .about-cadence-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
  max-width: 26rem;
}
.page-about .about-cadence-item--hot .about-cadence-desc {
  color: var(--paper);
  opacity: 0.85;
}

/* ---------- 联系方式 ---------- */
.page-about .about-contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 26px 0;
  max-width: 38rem;
}
.page-about .about-contact-card {
  background: var(--ink-2);
  padding: clamp(16px, 3vw, 22px);
}
.page-about .contact-key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mint);
}
.page-about .contact-value {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}
.page-about .about-contact-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 行动与时间标注 ---------- */
.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
}
.page-about .btn {
  display: inline-block;
  padding: 11px 20px;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid var(--mint);
  color: var(--mint);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.page-about .btn--solid {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 600;
}
.page-about .btn--solid:hover,
.page-about .btn--solid:focus-visible {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
}
.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  background: var(--mint);
  color: var(--ink);
}
.page-about .about-updated {
  margin: 26px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-steps,
  .page-about .about-cadence,
  .page-about .about-contact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面：左轨粘性 ---------- */
@media (min-width: 960px) {
  .page-about .about-rail-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: start;
  }
  .page-about .about-rail-sticky {
    position: sticky;
    top: var(--rail-top);
    padding-top: 4px;
  }
  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 14px;
  }
  .page-about .about-rail-list li {
    flex: 0 0 auto;
  }
  .page-about .about-rail-list a {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -16px;
    padding: 10px 12px 10px 14px;
    background: transparent;
  }
  .page-about .about-rail-list a:hover,
  .page-about .about-rail-list a:focus-visible {
    background: transparent;
    color: var(--mint);
    border-left-color: var(--mint);
  }
  .page-about .about-rail-dot {
    background: var(--line);
  }
  .page-about .about-rail-list a:hover .about-rail-dot,
  .page-about .about-rail-list a:focus-visible .about-rail-dot {
    background: var(--mint);
  }
  .page-about .about-stage-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
  }
  .page-about .about-stage-body--single {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-stage-media {
    order: -1;
  }
  .page-about .about-stage-body--single .about-stage-media--inline {
    order: 0;
    max-width: 38rem;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-dots rect,
  .page-about .about-ratio-seg,
  .page-about .btn,
  .page-about .breadcrumb a,
  .page-about .about-rail-list a {
    transition: none;
  }
  .page-about .about-dots rect:hover {
    transform: none;
  }
}
<<<END>>>