.page-about {
  --about-rule: rgba(22, 70, 95, 0.62);
  --about-rule-strong: rgba(22, 70, 95, 0.95);
  --about-text: rgba(244, 250, 252, 0.78);
  --about-text-soft: rgba(244, 250, 252, 0.6);
  --about-card: rgba(10, 44, 66, 0.55);
  background: var(--deep);
  color: var(--paper);
  font-family: var(--font-sans);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-sans);
  color: var(--paper);
}

.page-about a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.35);
}

.page-about a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gray);
}

.page-about .breadcrumbs li + li::before {
  content: "／";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--gray);
  border-bottom-color: transparent;
}

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

.page-about .eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan-dim);
  font-weight: 600;
}

.page-about .section-title {
  font-family: var(--font-serif);
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  font-weight: 700;
  margin: 0 0 0.5em;
}

.page-about .lede,
.page-about .about-intro {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-text);
  max-width: 44em;
}

.page-about .about-intro {
  margin-bottom: clamp(20px, 2.6vw, 32px);
}

.page-about .stat-number {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 56px) 0 clamp(36px, 5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -18%;
  width: min(76vw, 820px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 58% 42%, rgba(53, 242, 208, 0.16), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  align-items: end;
}

.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5.2vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  font-weight: 700;
  margin: 0 0 0.55em;
  max-width: 16em;
}

.page-about .about-hero-figure {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(10, 44, 66, 0.96), rgba(4, 27, 42, 0.72));
  padding: clamp(16px, 2.2vw, 26px);
}

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 22px;
  height: 22px;
  background: var(--deep);
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-figure-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-figure-row:first-child {
  padding-top: 0;
}

.page-about .about-figure-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-figure-num {
  flex: 0 0 auto;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .about-figure-unit {
  font-size: 0.48em;
  margin-left: 3px;
  color: var(--cyan-dim);
}

.page-about .about-figure-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  padding: clamp(40px, 5.6vw, 82px) 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-section-head {
  max-width: 48em;
  margin-bottom: clamp(24px, 3.2vw, 40px);
}

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 3.4vw, 48px);
}

.page-about .about-split-main {
  min-width: 0;
}

.page-about .about-split-side {
  display: grid;
  gap: clamp(14px, 1.8vw, 20px);
  align-content: start;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--line) 58%, transparent);
}

.page-about .about-node {
  position: relative;
  padding-left: 30px;
}

.page-about .about-node-mark {
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  background: var(--deep);
  border: 1px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  box-shadow: 0 0 0 3px rgba(53, 242, 208, 0.1);
}

.page-about .about-node-era {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--coral);
}

.page-about .about-node-title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.4;
  font-weight: 700;
}

.page-about .about-node-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
}

/* ---------- 旁注卡 ---------- */

.page-about .about-note {
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: var(--about-card);
  padding: clamp(16px, 2vw, 22px);
}

.page-about .about-note-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-text-soft);
}

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

/* ---------- 数据流程 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  padding: clamp(16px, 2.2vw, 22px) 0;
  border-top: 1px solid var(--about-rule);
}

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

.page-about .about-step-num {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--coral);
  padding-top: 3px;
}

.page-about .about-step-body h3 {
  margin: 0 0 6px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-step-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(10, 44, 66, 0.9), rgba(4, 27, 42, 0.6));
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-method-figure {
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-coast-figure {
  margin-top: clamp(24px, 3.2vw, 40px);
}

/* ---------- 标签页 ---------- */

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.page-about .tab {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--gray);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 8px 14px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .tab:hover {
  color: var(--paper);
  border-color: var(--cyan-dim);
}

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

.page-about .tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deep);
}

.page-about .tabpanel {
  padding-top: clamp(16px, 2.2vw, 24px);
}

.page-about .tabpanel[hidden] {
  display: none;
}

.page-about .tabpanel h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  line-height: 1.42;
}

.page-about .tabpanel > p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  max-width: 42em;
}

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

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-roles {
  margin-top: clamp(6px, 1vw, 12px);
}

/* ---------- 版本节奏引用条 ---------- */

.page-about .about-cadence-tabs {
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .about-pullquote {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-pullquote-num {
  font-size: clamp(48px, 7vw, 76px);
  line-height: 0.9;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .about-pullquote p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  max-width: 40em;
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco-stats {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: clamp(20px, 2.6vw, 32px) 0 clamp(26px, 3.4vw, 40px);
}

.page-about .about-eco-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--deep);
  padding: clamp(16px, 2.2vw, 26px);
}

.page-about .about-eco-num {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .about-eco-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-eco-split {
  display: grid;
  gap: clamp(20px, 2.8vw, 40px);
}

.page-about .about-eco-text h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  line-height: 1.42;
}

.page-about .about-eco-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
}

/* ---------- 行动区 ---------- */

.page-about .about-cta {
  padding: clamp(38px, 5.2vw, 76px) 0;
  border-top: 1px solid var(--about-rule-strong);
  background: linear-gradient(160deg, rgba(10, 44, 66, 0.85), rgba(4, 27, 42, 0.4));
}

.page-about .about-cta-inner {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-cta-text p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
  max-width: 40em;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.page-about .about-cta-actions .button--quiet {
  border-bottom-color: transparent;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-eco-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

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

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

  .page-about .about-pullquote {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: clamp(20px, 3vw, 40px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1080px) {
  .page-about .about-split-side {
    padding-left: clamp(0px, 1.4vw, 18px);
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-split--flip .about-split-side {
    order: -1;
    padding-left: 0;
    padding-right: clamp(0px, 1.4vw, 18px);
    border-left: 0;
    border-right: 1px solid var(--about-rule);
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tab {
    transition: none;
  }
}
<<<END>>>