.page-about {
  --about-lead: clamp(15px, 1.7vw, 17px);
  color: var(--text);
  font-family: var(--font-body);
}

.page-about .about-shell {
  padding-block: clamp(16px, 2.4vw, 28px) clamp(56px, 8vw, 120px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

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

.page-about .breadcrumb a:hover {
  color: var(--ice);
}

.page-about .breadcrumb__sep {
  color: var(--blueprint);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 56px);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 clamp(16px, 2vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 88px);
  line-height: 0.94;
  letter-spacing: -0.03em;
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0 0 clamp(22px, 3vw, 30px);
  font-size: var(--about-lead);
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 106, 26, 0.16), transparent 46%, rgba(36, 224, 207, 0.14));
  pointer-events: none;
}

.page-about .about-hero__figure img,
.page-about .flow__figure img,
.page-about .eco__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 规模刻度 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: clamp(34px, 5vw, 64px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-stats__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  margin-top: clamp(56px, 8vw, 112px);
}

.page-about .about-section__head {
  max-width: 64ch;
}

.page-about .about-section__head .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-section__title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.4vw, 48px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .about-section__lede {
  margin: 0;
  font-size: var(--about-lead);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 时间轨道 ---------- */

.page-about .track {
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .track__item {
  display: grid;
  gap: 14px;
  padding: clamp(24px, 3vw, 36px) 0;
  border-top: 1px solid var(--line-soft);
  position: relative;
}

.page-about .track__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .track__year-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .track__year-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ice);
  writing-mode: horizontal-tb;
}

.page-about .track__card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--orange);
  border-radius: var(--radius);
  box-shadow: 0 20px 42px -34px rgba(0, 0, 0, 0.95);
}

.page-about .track__version {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .track__card-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .track__card-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .track__more {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .track__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ember);
}

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

.page-about .track__more summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
}

.page-about .track__more[open] summary::after {
  content: "−";
}

.page-about .track__more ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .track__more li + li {
  margin-top: 6px;
}

/* ---------- 数据链路 ---------- */

.page-about .flow {
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .flow__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .flow__layers {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-about .flow__layer {
  padding: 0 0 0 18px;
  position: relative;
}

.page-about .flow__layer + .flow__layer {
  margin-top: 18px;
}

.page-about .flow__layer::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(36, 224, 207, 0.12);
}

.page-about .flow__layer-name {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ice);
  margin-bottom: 4px;
}

.page-about .flow__layer-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .flow__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--green);
  background: rgba(61, 242, 160, 0.05);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 值守 ---------- */

.page-about .duty {
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(115deg, rgba(36, 224, 207, 0.06) 0 1px, transparent 1px 26px),
    linear-gradient(180deg, var(--panel-2), var(--panel));
}

.page-about .duty__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .duty__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}

.page-about .duty__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .duty__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text);
}

.page-about .duty__note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */

.page-about .eco__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .eco__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .eco__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 2.4vw, 24px);
}

.page-about .eco__tags .league-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 12px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .eco__tags .league-chip:hover {
  color: var(--ice);
  border-color: var(--line-strong);
}

.page-about .eco__tags .league-chip[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .eco__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__list li {
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .eco__list strong {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .eco__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .eco__note a,
.page-about .promise__text a,
.page-about .about-cta__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 224, 207, 0.4);
}

.page-about .eco__note a:hover,
.page-about .promise__text a:hover,
.page-about .about-cta__text a:hover {
  color: var(--ice);
  border-bottom-color: var(--ice);
}

/* ---------- 服务承诺 ---------- */

.page-about .promise {
  display: grid;
  gap: 0;
  margin-top: clamp(24px, 3.4vw, 40px);
  border-top: 1px solid var(--line-soft);
}

.page-about .promise__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px 14px;
  padding: clamp(20px, 2.8vw, 28px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .promise__index {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
  padding-top: 4px;
}

.page-about .promise__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .promise__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  display: grid;
  gap: 22px;
  margin-top: clamp(56px, 8vw, 104px);
  padding: clamp(24px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, rgba(255, 106, 26, 0.14), transparent 52%),
    linear-gradient(300deg, rgba(36, 224, 207, 0.12), transparent 46%),
    var(--panel);
}

.page-about .about-cta .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ember);
  text-transform: uppercase;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 断点 ---------- */

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

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

  .page-about .promise__item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 8px 20px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .track__item {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    padding-block: clamp(30px, 3.4vw, 44px);
  }

  .page-about .track__item:nth-child(even) .track__card {
    margin-left: clamp(12px, 2.4vw, 40px);
  }

  .page-about .flow {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .eco__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

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