.page-about {
  --about-sec-pad: clamp(36px, 5vw, 64px);
  --about-grid-line: rgba(30, 69, 96, 0.45);
  background: var(--ink-900);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(104px, 13vw, 156px);
  padding-bottom: clamp(32px, 4vw, 56px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, var(--about-grid-line) 0 1px, transparent 1px var(--grid-cell)),
    repeating-linear-gradient(to bottom, var(--about-grid-line) 0 1px, transparent 1px var(--grid-cell));
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 62%, transparent 100%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 44px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.2vw, 68px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.015em;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-900);
}

.page-about .about-facts__num {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.01em;
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  margin-top: clamp(28px, 4vw, 48px);
  aspect-ratio: 16 / 7;
}

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

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(56px, 8vw, 112px);
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0 10px;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--deep-muted);
}

.page-about .about-toc ol {
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0 2px 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 4px 0;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc a .mono {
  font-size: 12px;
  color: var(--mint);
  opacity: 0.85;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--mint-soft);
  border-bottom-color: var(--mint);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: var(--about-sec-pad);
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-sec--last {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-sec__title {
  margin: 12px 0 0;
  font-size: clamp(22px, 3.4vw, 38px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lede {
  max-width: 60ch;
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-sec__text {
  max-width: 60ch;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

.page-about .tl {
  position: relative;
  border-left: 1px solid var(--line);
  padding-left: clamp(20px, 3vw, 32px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 22px;
  width: 9px;
  height: 9px;
  background: var(--deep-muted);
  transition: background 0.2s var(--ease);
}

.page-about .tl[open]::before {
  background: var(--mint);
}

.page-about .tl > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--mint);
}

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

.page-about .tl__idx {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .tl__title {
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  color: var(--text);
}

.page-about .tl__body {
  padding: 2px 0 18px;
}

.page-about .tl__body p {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .bars {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .bar__name {
  font-size: 15px;
  font-weight: 500;
}

.page-about .bar__num {
  font-size: 13px;
  color: var(--mint);
}

.page-about .bar__track {
  position: relative;
  height: 12px;
  background: rgba(30, 69, 96, 0.6);
  border: 1px solid var(--line);
}

.page-about .bar__fill {
  display: block;
  width: var(--w, 0%);
  height: 100%;
  background: var(--mint);
  opacity: 0.78;
  transition: opacity 0.2s var(--ease);
}

.page-about .bar__track:hover .bar__fill,
.page-about .bar__track:focus-within .bar__fill {
  opacity: 1;
}

.page-about .bar__track::after {
  content: attr(data-tip);
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  z-index: 3;
  width: max-content;
  max-width: min(260px, 80vw);
  padding: 8px 10px;
  background: var(--card);
  border: 1px solid var(--mint);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
  pointer-events: none;
}

.page-about .bar__track:hover::after,
.page-about .bar__track:focus-within::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .team-note {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
}

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

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

/* ---------- 指标 ---------- */
.page-about .metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .metrics__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--panel);
}

.page-about .metrics__num {
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
}

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

.page-about .metrics__unit {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 原则 ---------- */
.page-about .principles {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .principle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 24px);
  border-left: 3px solid var(--mint);
  padding: 4px 0 4px clamp(16px, 2.4vw, 26px);
}

.page-about .principle__num {
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--card);
  letter-spacing: -0.02em;
}

.page-about .principle__text h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
}

.page-about .principle__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 认可 ---------- */
.page-about .recognition {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .recognition__list {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .honor {
  padding: 18px 20px;
  background: var(--panel);
  border-left: 1px solid var(--line);
}

.page-about .honor h3 {
  margin: 12px 0 8px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .honor p {
  margin: 0;
  max-width: 54ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .recognition__note {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
}

.page-about .recognition__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
}

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

/* ---------- 联系 ---------- */
.page-about .contact-list {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .contact-list__row {
  display: grid;
  gap: 6px;
  padding: 14px clamp(14px, 2vw, 20px);
  background: var(--ink-900);
}

.page-about .contact-list__row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--deep-muted);
}

.page-about .contact-list__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .contact-list__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .team-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .recognition {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .recognition__figure {
    margin-top: 40px;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 0;
    border-bottom: 0;
    padding: 0;
  }

  .page-about .about-toc__label {
    margin-bottom: 16px;
  }

  .page-about .about-toc ol {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-toc li + li {
    margin-top: 4px;
  }

  .page-about .about-toc a {
    display: flex;
    gap: 10px;
    padding: 9px 0 9px 14px;
    font-size: 13px;
    border-bottom: 0;
    border-left: 1px solid transparent;
    margin-left: -1px;
    white-space: normal;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    border-left-color: var(--mint);
  }

  .page-about .about-main {
    max-width: 1080px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a,
  .page-about .bar__fill,
  .page-about .bar__track::after,
  .page-about .tl::before {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}