.page-about {
  --about-line: 1px solid var(--line-soft);
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 34px) clamp(56px, 8vw, 96px);
  color: var(--paper);
  font-family: var(--font-sans);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 面包屑 */
.page-about .about-crumbs ol {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  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 .about-crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

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

.page-about .about-crumb-sep { color: var(--line); }

.page-about .about-crumbs [aria-current="page"] { color: var(--cyan-soft); }

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  padding: clamp(24px, 5vw, 56px) 0 clamp(32px, 5vw, 64px);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-kicker-idx {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--cyan);
  color: var(--ink-950);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 2.2vw, 1.0625rem);
  line-height: 1.72;
  color: rgba(243, 251, 247, 0.8);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .about-hero-stats li {
  min-width: 0;
  padding: 14px 12px 14px 0;
}

.page-about .about-hero-stats li + li {
  padding-left: 14px;
  border-left: var(--about-line);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 4.4vw, 1.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .stat-unit {
  margin-left: 2px;
  font-size: 0.6em;
  color: var(--cyan-soft);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) clamp(48px, 10vw, 120px) var(--r-lg);
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900));
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(2, 16, 13, 0) 42%, rgba(2, 16, 13, 0.9) 100%);
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  margin: 0;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--cyan-soft);
}

/* 编号章节 */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding: clamp(32px, 6vw, 56px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter-index {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  font-weight: 800;
  line-height: 0.86;
  letter-spacing: -0.05em;
  background: linear-gradient(160deg, var(--cyan) 0%, var(--line) 88%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-chapter-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-chapter-body h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter-body > p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(243, 251, 247, 0.78);
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 4px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--orange) 54%, var(--line) 100%);
  opacity: 0.75;
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .tl-item:last-child { padding-bottom: 0; }

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(41, 242, 194, 0.12);
  transition: transform 180ms ease;
}

.page-about .tl-item--b::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 54, 0.12);
}

.page-about .tl-item--c::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, 0.12);
}

.page-about .tl-item:hover::before { transform: scale(1.18); }

.page-about .tl-years {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.74;
  color: rgba(243, 251, 247, 0.76);
}

.page-about .tl-note {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
  transition: border-color 180ms ease, color 180ms ease;
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  border-left-color: var(--cyan);
  color: var(--cyan-soft);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 36px);
  align-items: center;
  margin-top: 24px;
}

.page-about .about-ring {
  margin: 0;
  display: grid;
  gap: 16px;
  justify-items: center;
}

.page-about .ring-chart {
  width: min(240px, 68vw);
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(
    var(--cyan) 0deg 118deg,
    var(--orange) 118deg 254deg,
    var(--amber) 254deg 310deg,
    rgba(166, 255, 233, 0.55) 310deg 360deg
  );
  transition: transform 200ms ease;
}

.page-about .ring-chart:hover { transform: scale(1.02); }

.page-about .ring-hole {
  width: 64%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--ink-900);
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 2px;
  box-shadow: inset 0 0 0 1px var(--line-soft);
}

.page-about .ring-total {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1;
  color: var(--paper);
}

.page-about .ring-unit {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ring-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  display: grid;
  gap: 6px;
}

.page-about .ring-legend li {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-size: 13px;
  color: rgba(243, 251, 247, 0.82);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-about .ring-legend li:hover {
  border-color: var(--line);
  background: rgba(11, 42, 34, 0.65);
}

.page-about .ring-swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--cyan);
}

.page-about .ring-legend li:nth-child(2) .ring-swatch { background: var(--orange); }
.page-about .ring-legend li:nth-child(3) .ring-swatch { background: var(--amber); }
.page-about .ring-legend li:nth-child(4) .ring-swatch { background: var(--cyan-soft); }

.page-about .ring-legend b {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan-soft);
}

.page-about .about-team-media,
.page-about .about-partners-media {
  margin: 0;
  overflow: hidden;
  border: var(--about-line);
  border-radius: var(--r-lg);
  background: var(--ink-800);
  box-shadow: var(--shadow-card);
}

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

.page-about .about-team-media figcaption,
.page-about .about-partners-media figcaption {
  margin: 0;
  padding: 12px 16px;
  border-top: var(--about-line);
  background: rgba(2, 16, 13, 0.5);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* 合作网络 */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .partner-block {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(165deg, var(--ink-800) 0%, var(--ink-900) 100%);
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.page-about .partner-block:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .partner-block--a { border-radius: var(--r-md) var(--r-md) 28px 28px; }
.page-about .partner-block--b { border-radius: 28px var(--r-md) var(--r-md) var(--r-md); }
.page-about .partner-block--c { border-radius: var(--r-md) 28px var(--r-md) var(--r-md); }

.page-about .partner-block p.partner-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 5vw, 2.3rem);
  font-weight: 800;
  line-height: 1;
  color: var(--orange);
}

.page-about .partner-block h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .partner-block p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-partners-media { margin-top: 24px; }

/* 服务原则 */
.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .principle-card {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(11, 42, 34, 0.55);
  transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.page-about .principle-card:hover,
.page-about .principle-card:focus-within {
  border-color: var(--cyan);
  background: rgba(18, 59, 48, 0.75);
  transform: translateY(-2px);
}

.page-about .principle-tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(41, 242, 194, 0.12);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .principle-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .principle-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* 资质记录 */
.page-about .about-honors {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .about-honors li {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: var(--about-line);
  transition: background-color 160ms ease;
}

.page-about .about-honors li:hover { background: rgba(11, 42, 34, 0.55); }

.page-about .honor-key {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .honor-val {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(243, 251, 247, 0.84);
}

.page-about .about-honors-note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* 问答 */
.page-about .about-faq {
  display: grid;
  gap: 10px;
}

.page-about .faq-item {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(11, 42, 34, 0.5);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-about .faq-item:hover,
.page-about .faq-item[open] {
  border-color: var(--line);
  background: rgba(18, 59, 48, 0.6);
}

.page-about .faq-item summary {
  position: relative;
  padding: 15px 18px 15px 46px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--paper);
}

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

.page-about .faq-item summary::before {
  content: "+";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .faq-item[open] summary::before { content: "−"; }

.page-about .faq-item p {
  margin: 0;
  padding: 0 18px 16px 46px;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(243, 251, 247, 0.76);
}

.page-about .about-more {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}

.page-about .link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .link-more:hover,
.page-about .link-more:focus-visible {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan);
}

/* 断点 */
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: 250px minmax(0, 1fr);
    align-items: center;
  }
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 16px;
  }
  .page-about .partner-block--b { margin-top: 28px; }
  .page-about .partner-block--c { margin-top: 56px; }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(28px, 5vw, 64px);
    padding: clamp(48px, 6vw, 76px) 0;
  }
  .page-about .about-chapter-index {
    display: block;
    position: sticky;
    top: 92px;
    align-self: start;
  }
  .page-about .about-chapter-label {
    display: block;
    margin-top: 12px;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(32px, 4vw, 64px);
  }
  .page-about .about-hero-media img { aspect-ratio: 12 / 13; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .page-about .ring-chart:hover,
  .page-about .partner-block:hover,
  .page-about .principle-card:hover,
  .page-about .tl-item:hover::before {
    transform: none;
  }
}
<<<END>>>