.page-about {
  --about-gutter: 20px;
  --about-max: var(--content-max);
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-body);
}

.page-about .container {
  width: 100%;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--about-gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--c-muted);
}

.page-about .breadcrumb a {
  color: var(--c-ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--c-red);
  border-bottom-color: var(--c-gold);
}

.page-about .crumb-sep {
  color: var(--c-line);
  font-family: var(--font-mono);
}

.page-about .crumb-current {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-red);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 26px 0 34px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-hero-main .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-gold);
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 7.2vw, 62px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--c-ink);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ink-2);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero-actions .btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .btn-primary {
  background: var(--c-red);
  color: var(--c-paper);
}

.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: var(--c-red-deep);
  transform: translateY(-2px);
}

.page-about .btn-ghost {
  background: transparent;
  color: var(--c-ink);
  border-color: var(--c-line);
}

.page-about .btn-ghost:hover,
.page-about .btn-ghost:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-red);
  transform: translateY(-2px);
}

.page-about .about-hero-side {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(165deg, var(--c-red), var(--c-red-deep));
  color: var(--c-paper);
  clip-path: polygon(0 14%, 100% 0, 100% 100%, 0 100%);
}

.page-about .side-label {
  margin: 10px 0 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: rgba(250, 248, 244, .72);
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 0;
}

.page-about .stat {
  border-top: 1px solid rgba(199, 162, 74, .55);
  padding-top: 10px;
}

.page-about .stat dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(250, 248, 244, .78);
}

.page-about .stat dd {
  margin: 6px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 30px);
  font-weight: 600;
  line-height: 1;
  color: var(--c-paper);
}

.page-about .stat-unit {
  font-size: 12px;
  color: rgba(250, 248, 244, .82);
}

.page-about .side-foot {
  margin: 20px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(250, 248, 244, .82);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .toc-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-muted);
  margin-right: 4px;
}

.page-about .about-toc a {
  padding: 6px 12px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 12.5px;
  color: var(--c-ink-2);
  text-decoration: none;
  background: var(--c-paper);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-red);
  background: var(--c-warm);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  display: grid;
  gap: 16px;
  padding: 40px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .chapter--last {
  border-bottom: 0;
  padding-bottom: 20px;
}

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

.page-about .chapter-num {
  display: block;
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--c-ink);
  opacity: .2;
}

.page-about .chapter-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--c-gold);
}

.page-about .chapter-body h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 33px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--c-ink);
}

.page-about .chapter-body p {
  margin: 0 0 14px;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--c-ink-2);
}

.page-about .chapter-lead {
  font-size: 16.5px !important;
  color: var(--c-ink) !important;
}

.page-about .chapter-quote {
  margin: 22px 0;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--c-gold);
  font-family: var(--font-display);
  font-size: clamp(17px, 3.4vw, 21px);
  line-height: 1.6;
  color: var(--c-red);
  max-width: 30em;
}

/* ---------- 图文组合 ---------- */
.page-about .chapter-grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .img-frame {
  display: block;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: var(--c-warm);
}

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

.page-about .img-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.page-about .img-frame--3x2 {
  aspect-ratio: 3 / 2;
}

/* ---------- 侧注卡 ---------- */
.page-about .note-card {
  padding: 20px;
  background: var(--c-warm);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
}

.page-about .note-card--inline {
  margin-top: 22px;
}

.page-about .note-title {
  margin: 0 0 12px !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: .16em;
  color: var(--c-gold) !important;
}

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

.page-about .note-list li {
  position: relative;
  padding: 9px 0 9px 16px;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--c-ink-2);
  border-bottom: 1px solid rgba(216, 210, 199, .8);
}

.page-about .note-list li:last-child {
  border-bottom: 0;
}

.page-about .note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-red);
}

.page-about .note-foot {
  margin: 14px 0 0 !important;
  font-size: 13px !important;
  line-height: 1.7;
  color: var(--c-muted) !important;
}

/* ---------- 规格表 ---------- */
.page-about .spec-list {
  margin: 6px 0 0;
  border-top: 1px solid var(--c-line);
}

.page-about .spec-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .spec-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-muted);
}

.page-about .spec-val {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--c-ink-2);
}

/* ---------- 团队分工 ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .role-card {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-2px);
  border-color: var(--c-gold);
}

.page-about .role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--c-red);
}

.page-about .role-name {
  margin: 10px 0 8px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .role-desc {
  margin: 0 !important;
  font-size: 14px !important;
  line-height: 1.72 !important;
  color: var(--c-muted) !important;
}

/* ---------- 流程 ---------- */
.page-about .flow-intro {
  margin: 26px 0 12px !important;
  font-size: 14px !important;
  color: var(--c-muted) !important;
}

.page-about .flow-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.page-about .flow-item {
  display: grid;
  gap: 4px;
  padding-top: 12px;
  border-top: 2px solid var(--c-gold);
}

.page-about .flow-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-red);
}

.page-about .flow-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .flow-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-muted);
}

/* ---------- 客户结构 ---------- */
.page-about .mix-block {
  padding: 20px;
  background: var(--c-warm);
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
}

.page-about .mix-title {
  margin: 0 0 16px !important;
  font-family: var(--font-mono);
  font-size: 12px !important;
  letter-spacing: .16em;
  color: var(--c-ink) !important;
}

.page-about .mix-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .mix-item {
  display: grid;
  gap: 7px;
}

.page-about .mix-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--c-ink-2);
}

.page-about .mix-head .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-red);
}

.page-about .mix-bar {
  display: block;
  height: 6px;
  border-radius: var(--r-pill);
  background: rgba(216, 210, 199, .7);
  overflow: hidden;
}

.page-about .mix-fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--c-red), var(--c-red-deep));
}

.page-about .mix-fill.w38 { width: 38%; }
.page-about .mix-fill.w27 { width: 27%; }
.page-about .mix-fill.w21 { width: 21%; }
.page-about .mix-fill.w14 { width: 14%; }

.page-about .mix-foot {
  margin: 16px 0 0 !important;
  font-size: 13px !important;
  line-height: 1.7;
  color: var(--c-muted) !important;
}

/* ---------- 认证 ---------- */
.page-about .cert-grid {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
}

.page-about .cert-card {
  position: relative;
  padding: 20px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .cert-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--c-red), var(--c-gold));
}

.page-about .cert-card:hover,
.page-about .cert-card:focus-within {
  border-color: var(--c-gold);
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.page-about .cert-code {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .cert-name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .cert-desc {
  margin: 0 !important;
  font-size: 14px !important;
  line-height: 1.74 !important;
  color: var(--c-muted) !important;
  max-width: none !important;
}

.page-about .quality-list {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .q-item {
  padding: 14px 0 14px 16px;
  border-left: 1px solid var(--c-line);
}

.page-about .q-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .q-item p {
  margin: 0 !important;
  font-size: 14px !important;
  line-height: 1.72 !important;
  color: var(--c-muted) !important;
  max-width: none !important;
}

/* ---------- 时间线 ---------- */
.page-about .timeline-figure {
  margin: 6px 0 84px;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-red), var(--c-gold));
}

.page-about .tl-item {
  position: relative;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-red);
  box-shadow: 0 0 0 3px var(--c-paper), 0 0 0 4px var(--c-gold);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .tl-title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .tl-desc {
  margin: 0 !important;
  font-size: 13.5px !important;
  line-height: 1.7 !important;
  color: var(--c-muted) !important;
  max-width: none !important;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin: 10px 0 56px;
  padding: 32px 22px;
  background: var(--c-ink);
  border-radius: var(--r-lg);
  background-image:
    linear-gradient(135deg, rgba(176, 18, 47, .55), rgba(18, 19, 22, 0) 62%),
    repeating-linear-gradient(90deg, rgba(199, 162, 74, .12) 0 1px, transparent 1px 96px);
  color: var(--c-paper);
}

.page-about .cta-inner {
  display: grid;
  gap: 22px;
}

.page-about .eyebrow--light {
  display: block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-gold);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.76;
  color: rgba(250, 248, 244, .82);
}

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

.page-about .cta-actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .btn-gold {
  background: var(--c-gold);
  color: var(--c-ink);
}

.page-about .btn-gold:hover,
.page-about .btn-gold:focus-visible {
  background: #d8b45f;
  transform: translateY(-2px);
}

.page-about .btn-ghost--light {
  background: transparent;
  color: var(--c-paper);
  border-color: rgba(250, 248, 244, .38);
}

.page-about .btn-ghost--light:hover,
.page-about .btn-ghost--light:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-gold);
  transform: translateY(-2px);
}

.page-about .about-cta .btn-primary:hover,
.page-about .about-cta .btn-primary:focus-visible {
  background: var(--c-red-deep);
  transform: translateY(-2px);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about {
    --about-gutter: 28px;
  }

  .page-about .chapter-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .chapter-grid--media {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  }

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

  .page-about .quality-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 22px;
  }

  .page-about .about-cta {
    padding: 40px 32px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-gutter: 40px;
  }

  .page-about .breadcrumb {
    padding-top: 26px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.32fr) minmax(280px, .68fr);
    gap: 40px;
    align-items: start;
    padding: 40px 0 52px;
  }

  .page-about .about-hero-side {
    margin-top: 8px;
    padding: 30px 26px 32px;
  }

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

  .page-about .chapter {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 36px;
    padding: 62px 0;
  }

  .page-about .chapter-index {
    position: sticky;
    top: 112px;
    display: block;
    align-self: start;
  }

  .page-about .chapter-num {
    font-size: 66px;
    margin-bottom: 10px;
  }

  .page-about .chapter-kicker {
    display: block;
    padding-top: 10px;
    border-top: 1px solid var(--c-gold);
  }

  .page-about .chapter-body {
    padding-left: 36px;
    border-left: 1px solid var(--c-line);
    min-width: 0;
  }

  .page-about .spec-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding: 18px 0;
  }

  .page-about .timeline-figure {
    margin-bottom: 12px;
  }

  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
    padding: 34px 0 0;
  }

  .page-about .timeline::before {
    left: 0;
    right: 0;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--c-red), var(--c-gold));
  }

  .page-about .tl-item::before {
    left: 0;
    top: -30px;
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
    gap: 32px;
  }

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

@media (min-width: 1200px) {
  .page-about .chapter {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .chapter-num {
    font-size: 76px;
  }
}
<<<END>>>