.page-about {
  --about-gap: clamp(18px, 2.4vw, 32px);
  --about-pad: clamp(36px, 5vw, 64px);
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-sans);
}

.page-about .num,
.page-about .about-rail-key,
.page-about .about-stage-time,
.page-about .section-index,
.page-about .about-eyebrow,
.page-about .about-breadcrumb,
.page-about .about-mini-list dt,
.page-about .about-next-tag {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  padding: clamp(104px, 14vw, 168px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(23, 195, 212, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 195, 212, 0.07) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: linear-gradient(180deg, #000 10%, transparent 82%);
  mask-image: linear-gradient(180deg, #000 10%, transparent 82%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 62%;
  height: 90%;
  background: linear-gradient(135deg, rgba(23, 195, 212, 0.18), transparent 62%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(26px, 4vw, 44px);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan-soft);
}

.page-about .about-breadcrumb a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(29px, 5vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--white);
  max-width: 22ch;
}

.page-about .about-lede {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: rgba(247, 249, 251, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-panels {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .about-panel-start,
.page-about .about-panel-uptime {
  padding: 20px 22px;
}

.page-about .about-panel-start {
  background: var(--ink);
  border: 1px solid rgba(23, 195, 212, 0.28);
}

.page-about .about-panel-uptime {
  background: var(--paper);
  color: var(--graphite);
  border: 1px solid var(--mist);
}

.page-about .panel-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 4.6vw, 50px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 6px 0 6px;
}

.page-about .about-panel-start .panel-value {
  color: var(--cyan);
}

.page-about .about-panel-uptime .panel-value {
  color: var(--deep);
  border-bottom: 3px solid var(--orange);
  display: inline-block;
  padding-bottom: 4px;
}

.page-about .about-unit {
  font-size: 0.46em;
  margin-left: 3px;
  color: var(--slate);
}

.page-about .about-panel-uptime .panel-note,
.page-about .about-panel-start .panel-note {
  font-size: 12.5px;
  line-height: 1.7;
  margin: 8px 0 0;
}

.page-about .about-panel-start .panel-note {
  color: rgba(247, 249, 251, 0.68);
}

.page-about .about-panel-uptime .panel-note {
  color: var(--slate);
}

.page-about .about-spark {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 34px;
  margin-top: 14px;
}

.page-about .about-spark span {
  flex: 1;
  height: 46%;
  background: var(--cyan);
  opacity: 0.42;
}

.page-about .about-spark span:nth-child(2n) { height: 66%; opacity: 0.62; }
.page-about .about-spark span:nth-child(3n) { height: 84%; opacity: 0.82; }
.page-about .about-spark span:nth-child(5n) { height: 96%; opacity: 1; }

.page-about .about-stat-strip {
  list-style: none;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid rgba(23, 195, 212, 0.32);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
}

.page-about .about-stat-strip li {
  display: grid;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid rgba(23, 195, 212, 0.45);
}

.page-about .about-stat-num {
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
}

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

.page-about .about-stat-label {
  font-size: 12.5px;
  color: rgba(247, 249, 251, 0.62);
  letter-spacing: 0.02em;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  background: var(--paper);
  padding: clamp(38px, 6vw, 78px) 0 clamp(46px, 7vw, 92px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-rail {
  min-width: 0;
  border-left: 2px solid var(--mist);
  padding-left: 14px;
}

.page-about .about-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

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

.page-about .about-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--deep);
  background: var(--white);
  border-color: var(--mist);
}

.page-about .about-rail-key {
  font-size: 11px;
  color: var(--cyan-ink);
}

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

.page-about .about-section {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--mist);
}

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

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .section-index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan-ink);
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-head .lede {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-prose p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
}

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

.page-about .about-link {
  display: inline-block;
  margin-top: 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(10, 124, 137, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--deep);
  border-bottom-color: var(--orange);
}

/* ---------- 01 起点 ---------- */
.page-about .about-prose-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-quote-panel {
  background: var(--white);
  border: 1px solid var(--mist);
  border-left: 3px solid var(--cyan);
  padding: 20px 20px 18px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-quote {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  line-height: 1.5;
  color: var(--deep);
  letter-spacing: -0.01em;
}

.page-about .about-quote-note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-mini-list {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--mist);
}

.page-about .about-mini-list > div {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-mini-list dt {
  min-width: 54px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan-ink);
}

.page-about .about-mini-list dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 02 版本时间轴 ---------- */
.page-about .about-timeline-wrap {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 14px;
  padding-left: 18px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--cyan-soft) 72%, transparent);
}

.page-about .about-stage {
  position: relative;
  background: var(--white);
  border: 1px solid var(--mist);
  padding: 18px 20px 16px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 26px;
  width: 9px;
  height: 9px;
  background: var(--white);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-stage:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-stage-ver {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-ink);
}

.page-about .about-stage h3 {
  margin: 0 0 6px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--deep);
}

.page-about .about-stage-time {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

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

.page-about .about-stage-gain {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--mist);
  font-size: 13.5px;
  color: var(--cyan-ink);
}

.page-about .about-stage--v4 {
  background: var(--deep);
  border-color: var(--deep);
}

.page-about .about-stage--v4::before {
  background: var(--cyan);
  border-color: var(--orange);
}

.page-about .about-stage--v4 h3 {
  color: var(--white);
}

.page-about .about-stage--v4 p {
  color: rgba(247, 249, 251, 0.78);
}

.page-about .about-stage--v4 .about-stage-ver {
  color: var(--cyan);
}

.page-about .about-stage--v4 .about-stage-time {
  color: rgba(247, 249, 251, 0.5);
}

.page-about .about-stage--v4 .about-stage-gain {
  border-top-color: rgba(23, 195, 212, 0.32);
  color: var(--cyan-soft);
}

.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure .figure-frame {
  border: 1px solid var(--mist);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-team-lines {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-about .about-line {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 18px;
  background: var(--white);
  border: 1px solid var(--mist);
  border-left: 3px solid var(--cyan);
}

.page-about .about-line--tech { border-left-color: var(--deep); }
.page-about .about-line--region { border-left-color: var(--green); }

.page-about .about-line-num {
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--deep);
  letter-spacing: -0.02em;
}

.page-about .about-line-body {
  min-width: 0;
}

.page-about .about-line h3 {
  margin: 2px 0 8px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .about-line-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .about-line-who {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--mist);
  font-size: 12.5px;
  color: var(--slate);
}

/* ---------- 04 区域协作 ---------- */
.page-about .about-section--ink {
  background: var(--ink);
  border-top: 0;
  color: var(--paper);
  padding: clamp(26px, 4vw, 42px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-section--ink .about-head h2 {
  color: var(--white);
}

.page-about .about-section--ink .about-head .lede {
  color: rgba(247, 249, 251, 0.72);
}

.page-about .about-section--ink .section-index {
  color: var(--cyan);
}

.page-about .about-section--ink .about-prose p {
  color: rgba(247, 249, 251, 0.82);
}

.page-about .about-section--ink .figure-caption {
  color: rgba(247, 249, 251, 0.58);
}

.page-about .about-section--ink .about-figure .figure-frame {
  border-color: rgba(23, 195, 212, 0.28);
}

.page-about .about-network-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-tags .tag {
  display: inline-block;
  padding: 7px 13px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--cyan-soft);
  background: rgba(23, 195, 212, 0.1);
  border: 1px solid rgba(23, 195, 212, 0.34);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-tags .tag:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  color: var(--white);
}

/* ---------- 05 稳定性 ---------- */
.page-about .about-uptime-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-meter-panel {
  padding: 22px;
  background: var(--ink);
  border: 1px solid rgba(23, 195, 212, 0.26);
}

.page-about .about-meter-panel .panel-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-meter {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 88px;
  margin: 16px 0 18px;
}

.page-about .about-meter span {
  flex: 1;
  min-height: 14%;
  background: linear-gradient(180deg, var(--cyan), rgba(23, 195, 212, 0.3));
  transition: opacity 0.25s var(--ease);
}

.page-about .about-meter span:nth-child(1) { height: 92%; }
.page-about .about-meter span:nth-child(2) { height: 78%; }
.page-about .about-meter span:nth-child(3) { height: 100%; }
.page-about .about-meter span:nth-child(4) { height: 84%; }
.page-about .about-meter span:nth-child(5) { height: 96%; }
.page-about .about-meter span:nth-child(6) { height: 70%; }
.page-about .about-meter span:nth-child(7) { height: 88%; }
.page-about .about-meter span:nth-child(8) { height: 94%; }
.page-about .about-meter span:nth-child(9) { height: 66%; }
.page-about .about-meter span:nth-child(10) { height: 100%; }
.page-about .about-meter span:nth-child(11) { height: 82%; }
.page-about .about-meter span:nth-child(12) { height: 90%; }

.page-about .about-meter span:hover {
  opacity: 0.6;
}

.page-about .about-recovery {
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px dashed rgba(23, 195, 212, 0.3);
}

.page-about .about-recovery li {
  counter-increment: step;
  display: flex;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(247, 249, 251, 0.78);
}

.page-about .about-recovery li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  padding-top: 2px;
}

/* ---------- 06 后续 ---------- */
.page-about .about-next-grid {
  display: grid;
  gap: 18px;
}

.page-about .about-next-item {
  padding-top: 14px;
  border-top: 3px solid var(--deep);
}

.page-about .about-next-tag {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan-ink);
}

.page-about .about-next-item h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .about-next-item p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--deep);
  color: var(--paper);
  padding: clamp(36px, 5vw, 64px) 0;
}

.page-about .about-cta-inner {
  display: grid;
  gap: 16px;
  justify-items: start;
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.26;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 249, 251, 0.78);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-stage--v1 { margin-right: 20%; }
  .page-about .about-stage--v2 { margin-right: 13%; }
  .page-about .about-stage--v3 { margin-right: 6%; }
  .page-about .about-stage--v4 { margin-right: 0; }

  .page-about .about-line--tech { margin-left: 5%; }
  .page-about .about-line--region { margin-left: 10%; }

  .page-about .about-next-grid {
    grid-template-columns: 1.15fr 1fr 0.85fr;
    gap: 22px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-hero-panels {
    margin-top: clamp(6px, 2vw, 26px);
  }

  .page-about .about-prose-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team-grid,
  .page-about .about-uptime-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(30px, 4.4vw, 62px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h-solid) + 26px);
    align-self: start;
  }

  .page-about .about-rail-list {
    display: grid;
    gap: 4px;
    overflow: visible;
  }

  .page-about .about-rail-link {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-tags .tag,
  .page-about .about-meter span,
  .page-about .about-rail-link {
    transition: none;
  }

  .page-about .about-stage:hover {
    transform: none;
  }

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