.page-about {
  --accent: var(--cyan);
  --about-line: rgba(200, 210, 224, 0.14);
  --about-line-strong: rgba(200, 210, 224, 0.28);
  --about-panel: rgba(18, 33, 58, 0.62);
  --about-deep: rgba(5, 10, 18, 0.86);
}

.page-about .breadcrumb {
  margin-top: clamp(1rem, 3vw, 2rem);
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0.5rem 0 0.9rem;
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 0.6rem;
}

.page-about p {
  color: var(--silver-200);
  line-height: 1.75;
  margin: 0 0 0.9rem;
}

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

.page-about a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(54, 230, 214, 0.35);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.page-about .btn {
  border-bottom: 1px solid transparent;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 7vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  color: var(--paper);
  margin: 0.6rem 0 1.6rem;
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  color: var(--silver-200);
  max-width: 60ch;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__stats li {
  background: var(--about-panel);
  padding: clamp(0.9rem, 2.4vw, 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.page-about .about-stat__lbl {
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--silver-500);
}

/* ---------- 起点 ---------- */

.page-about .about-origin {
  display: grid;
  gap: clamp(1.25rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 3.5rem);
  border-top: 1px solid var(--about-line);
}

.page-about .about-origin__body p {
  max-width: 68ch;
}

/* ---------- 发展轨迹 ---------- */

.page-about .about-trail {
  background:
    linear-gradient(180deg, rgba(18, 33, 58, 0.55) 0%, rgba(18, 33, 58, 0.12) 45%, rgba(5, 10, 18, 0) 100%);
  border-top: 1px solid var(--about-line);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-sec-head p {
  color: var(--silver-500);
  font-size: 0.98rem;
}

.page-about .about-trail__fig {
  margin: 0 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .trail {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .trail__rail {
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 0.9rem;
}

.page-about .trail__rail-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--silver-500);
  margin: 0 0 0.6rem;
}

.page-about .trail__rail ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .trail__rail ul::-webkit-scrollbar {
  display: none;
}

.page-about .trail__jump {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.6rem;
  color: var(--silver-500);
  border: 1px solid transparent;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .trail__jump:hover,
.page-about .trail__jump:focus-visible {
  color: var(--accent);
  border-color: var(--about-line-strong);
  background: rgba(54, 230, 214, 0.06);
}

.page-about .trail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .trail__item {
  position: relative;
  display: grid;
  gap: 0.75rem;
  padding-left: clamp(1rem, 3vw, 2rem);
  border-left: 1px solid var(--about-line);
}

.page-about .trail__item::before {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 0.55rem;
  width: 6px;
  height: 6px;
  background: var(--accent);
}

.page-about .trail__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 9vw, 4.4rem);
  font-weight: 600;
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--ink-700);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .trail__year {
    color: transparent;
    -webkit-text-stroke: 1px rgba(54, 230, 214, 0.45);
  }

  .page-about .trail__item:hover .trail__year {
    -webkit-text-stroke-color: var(--accent);
  }
}

.page-about .trail__content p {
  max-width: 62ch;
  font-size: 0.97rem;
}

.page-about .trail__meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--silver-500);
  margin-top: 0.75rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--about-line);
}

/* ---------- 版本追溯色带 ---------- */

.page-about .about-band {
  background:
    linear-gradient(135deg, rgba(27, 45, 74, 0.75) 0%, rgba(5, 10, 18, 0.94) 70%);
  border-block: 1px solid var(--about-line);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-band__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-band__intro p {
  max-width: 48ch;
  font-size: 0.97rem;
}

.page-about .about-band__sample {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-band__sample-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--silver-500);
}

.page-about .meta-list {
  margin: 0;
  display: grid;
  gap: 1px;
  padding: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .meta-list__row {
  background: rgba(10, 20, 36, 0.92);
  padding: 1rem 1.1rem;
  display: grid;
  gap: 0.35rem;
  transition: background-color 0.18s var(--ease);
}

.page-about .meta-list__row:hover {
  background: rgba(18, 33, 58, 0.95);
}

.page-about .meta-list dt {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .meta-list dd {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--silver-200);
}

/* ---------- 团队与流程 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-team__text p {
  max-width: 58ch;
  font-size: 0.97rem;
}

.page-about .fold {
  margin-top: 1.5rem;
  border: 1px solid var(--about-line);
  background: var(--about-panel);
  padding: 0 1.1rem;
  transition: border-color 0.18s var(--ease);
}

.page-about .fold:hover {
  border-color: var(--about-line-strong);
}

.page-about .fold summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 0;
  font-weight: 600;
  color: var(--paper);
  font-size: 0.95rem;
}

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

.page-about .fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--accent);
}

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

.page-about .fold ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: var(--silver-200);
  font-size: 0.93rem;
  line-height: 1.7;
}

.page-about .fold li {
  margin-bottom: 0.55rem;
}

.page-about .fold li:last-child {
  margin-bottom: 0;
}

.page-about .fold strong {
  color: var(--paper);
}

.page-about .about-team__fig {
  margin: 0;
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  background:
    radial-gradient(circle at 12% 8%, rgba(139, 124, 255, 0.16) 0%, rgba(139, 124, 255, 0) 55%),
    linear-gradient(180deg, rgba(5, 10, 18, 0.65) 0%, rgba(10, 20, 36, 0.95) 100%);
  border-top: 1px solid var(--about-line);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .eco-wall {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 clamp(2rem, 4vw, 3rem);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .eco-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--about-line);
  background: var(--about-panel);
  color: var(--silver-200);
  font-size: 0.88rem;
  line-height: 1.4;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .eco-chip__num {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
}

.page-about .eco-chip--author .eco-chip__num {
  color: var(--amber);
}

.page-about .eco-chip--design .eco-chip__num {
  color: var(--violet);
}

.page-about .eco-chip--sm {
  font-size: 0.82rem;
  color: var(--silver-500);
}

.page-about .eco-chip:nth-child(3n + 2) {
  transform: translateY(0.45rem);
}

.page-about .eco-chip:nth-child(4n + 3) {
  transform: translateY(-0.35rem);
}

.page-about .eco-chip:hover {
  border-color: var(--about-line-strong);
  background: rgba(54, 230, 214, 0.08);
}

.page-about .about-eco__body {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-eco__copy p {
  max-width: 62ch;
  font-size: 0.97rem;
}

.page-about .about-eco__fig {
  margin: 0;
}

/* ---------- 服务区域与联系 ---------- */

.page-about .about-contact {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-contact__panel {
  border: 1px solid var(--about-line);
  background:
    linear-gradient(160deg, rgba(18, 33, 58, 0.75) 0%, rgba(5, 10, 18, 0.95) 100%);
  padding: clamp(1.4rem, 4vw, 2.75rem);
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .about-contact__main p {
  max-width: 52ch;
  font-size: 0.97rem;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .about-contact__list {
  margin: 0;
  display: grid;
  gap: 0;
  align-self: start;
}

.page-about .about-contact__row {
  display: grid;
  gap: 0.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-contact__row:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .about-contact__row dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--silver-500);
}

.page-about .about-contact__row dd {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--silver-200);
  word-break: break-word;
}

.page-about .about-contact__row--note dd {
  color: var(--silver-500);
  font-size: 0.88rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .meta-list__row {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }

  .page-about .about-contact__row {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

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

  .page-about .about-team__fig {
    margin-top: 2.5rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .trail {
    grid-template-columns: 8rem minmax(0, 1fr);
    align-items: start;
  }

  .page-about .trail__rail {
    position: sticky;
    top: 7.5rem;
    align-self: start;
    border-bottom: 1px solid transparent;
    padding-bottom: 0;
  }

  .page-about .trail__rail ul {
    flex-direction: column;
    gap: 0.2rem;
    overflow: visible;
  }

  .page-about .trail__jump {
    display: block;
    border-left: 1px solid var(--about-line);
    border-bottom: 1px solid transparent;
  }

  .page-about .trail__jump:hover,
  .page-about .trail__jump:focus-visible {
    border-left-color: var(--accent);
  }

  .page-about .trail__item {
    grid-template-columns: 11rem minmax(0, 1fr);
    column-gap: clamp(1.5rem, 3vw, 2.5rem);
    padding-top: 0.35rem;
  }

  .page-about .trail__year {
    text-align: right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .eco-chip,
  .page-about .trail__jump,
  .page-about .meta-list__row,
  .page-about .fold,
  .page-about a {
    transition: none;
  }

  .page-about .eco-chip:nth-child(3n + 2),
  .page-about .eco-chip:nth-child(4n + 3) {
    transform: none;
  }
}
<<<END>>>