.page-about {
  --about-rail-w: 124px;
  --about-line-soft: rgba(34, 58, 94, .75);
  position: relative;
  overflow-x: clip;
  padding-block: clamp(16px, 2.4vw, 28px) clamp(60px, 9vw, 104px);
  color: var(--white);
  background:
    radial-gradient(900px 420px at 92% -8%, rgba(53, 230, 255, .10), transparent 62%),
    radial-gradient(720px 400px at -8% 44%, rgba(242, 193, 92, .055), transparent 58%);
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 0;
  list-style: none;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--slate);
}
.page-about .breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--line);
}
.page-about .breadcrumbs a {
  color: var(--slate);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--cyan);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  max-width: 940px;
  padding-bottom: clamp(8px, 1.4vw, 14px);
}
.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(2rem, 5.4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -.025em;
  font-weight: 900;
  max-width: 22ch;
  text-wrap: balance;
}
.page-about .about-hero .lead {
  margin: 0;
  max-width: 64ch;
  color: var(--slate);
  font-size: clamp(.96rem, 1.15vw, 1.06rem);
  line-height: 1.82;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 2.8vw, 30px);
}

/* 数字条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2vw, 22px);
  background: var(--panel);
}
.page-about .about-stat__num {
  font-size: clamp(1.5rem, 2.8vw, 2.15rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .about-stat--gold .about-stat__num {
  color: var(--gold);
}
.page-about .about-stat__label {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--slate);
}

/* 章节索引 */
.page-about .about-toc {
  display: flex;
  gap: 8px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-toc a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .84rem;
  color: var(--slate);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-about .about-toc a span {
  font-weight: 800;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}
.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--white);
  border-color: var(--teal);
  background: rgba(53, 230, 255, .08);
}

/* 图片容器 */
.page-about .about-visual,
.page-about .role-figure,
.page-about .coverage-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}
.page-about .about-visual {
  margin-top: clamp(22px, 3.4vw, 34px);
}
.page-about .role-figure {
  margin-top: clamp(18px, 2.6vw, 28px);
  max-width: 540px;
}
.page-about .coverage-figure {
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-visual img,
.page-about .role-figure img,
.page-about .coverage-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 章节骨架 */
.page-about .about-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
  padding-block: clamp(38px, 5.4vw, 68px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.page-about .about-section:first-of-type {
  border-top: 0;
  padding-top: clamp(30px, 4vw, 48px);
}
.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-line-soft);
}
.page-about .about-rail__num {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .about-rail__label {
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--slate);
}
.page-about .about-body {
  min-width: 0;
}
.page-about .about-h2 {
  margin: 0 0 clamp(12px, 1.8vw, 18px);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.015em;
}
.page-about .about-p {
  margin: 0 0 14px;
  max-width: 66ch;
  color: var(--slate);
  font-size: clamp(.94rem, 1.05vw, 1.02rem);
  line-height: 1.82;
}
.page-about .about-p:last-child {
  margin-bottom: 0;
}
.page-about .about-p--after {
  margin-top: clamp(18px, 2.6vw, 26px);
  padding-left: 14px;
  border-left: 2px solid var(--teal);
}

/* 角色卡片 */
.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(10px, 1.6vw, 16px);
  margin-top: clamp(16px, 2.4vw, 24px);
}
.page-about .role {
  padding: clamp(14px, 1.8vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: border-color .24s var(--ease), background .24s var(--ease);
}
.page-about .role[open] {
  border-color: var(--teal);
  background:
    linear-gradient(180deg, rgba(53, 230, 255, .07), transparent 62%),
    var(--panel);
}
.page-about .role__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 2px 0;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}
.page-about .role__head::-webkit-details-marker {
  display: none;
}
.page-about .role__head::marker {
  content: "";
}
.page-about .role__tag {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: rgba(53, 230, 255, .14);
  color: var(--cyan);
  font-size: .76rem;
  font-weight: 800;
}
.page-about .role__title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}
.page-about .role__count {
  margin-left: auto;
  font-size: .8rem;
  color: var(--gold);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.page-about .role__head::after {
  content: "+";
  flex: 0 0 auto;
  width: 16px;
  text-align: center;
  font-weight: 700;
  color: var(--slate);
  transition: transform .22s var(--ease), color .22s var(--ease);
}
.page-about .role[open] .role__head::after {
  transform: rotate(45deg);
  color: var(--cyan);
}
.page-about .role__body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.page-about .role__body p {
  margin: 0;
  color: var(--slate);
  font-size: .92rem;
  line-height: 1.8;
}

/* 服务范围 */
.page-about .coverage-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
}
.page-about .coverage-item {
  display: flex;
  gap: 12px;
  padding: clamp(14px, 1.8vw, 18px);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(18, 36, 74, .58), rgba(11, 23, 48, .58));
  transition: border-color .24s var(--ease), transform .24s var(--ease), background .24s var(--ease);
}
.page-about .coverage-item:hover,
.page-about .coverage-item:focus-within {
  border-color: var(--teal);
  transform: translateY(-2px);
  background: linear-gradient(180deg, rgba(53, 230, 255, .09), rgba(11, 23, 48, .62));
}
.page-about .coverage-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 230, 255, .14);
}
.page-about .coverage-item h3 {
  margin: 0 0 6px;
  font-size: .98rem;
  font-weight: 800;
  color: var(--white);
}
.page-about .coverage-item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--slate);
}

/* 维护流程 */
.page-about .notice-kinds {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(16px, 2.4vw, 22px) 0 clamp(18px, 2.8vw, 26px);
}
.page-about .flow-list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}
.page-about .flow-list li {
  display: flex;
  gap: 14px;
  padding: clamp(14px, 1.8vw, 20px);
  background: var(--panel);
}
.page-about .flow-num {
  flex: 0 0 auto;
  font-size: 1.02rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .flow-list h3 {
  margin: 0 0 4px;
  font-size: .95rem;
  font-weight: 800;
  color: var(--white);
}
.page-about .flow-list p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--slate);
}

/* 季度检查 */
.page-about .audit-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: clamp(16px, 2.4vw, 24px);
}
.page-about .audit-card {
  position: relative;
  padding: clamp(16px, 2vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}
.page-about .audit-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 72%);
}
.page-about .audit-card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--gold), transparent 72%);
}
.page-about .audit-card:nth-child(3)::before {
  background: linear-gradient(90deg, var(--mint), transparent 72%);
}
.page-about .audit-index {
  display: inline-block;
  margin-bottom: 10px;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}
.page-about .audit-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
}
.page-about .audit-card p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.75;
  color: var(--slate);
}

/* 联系 */
.page-about .reach-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(16px, 2.4vw, 24px);
}
.page-about .reach-contact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.page-about .reach-contact__label {
  display: block;
  margin-bottom: 6px;
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--slate);
}
.page-about .reach-contact__value {
  display: block;
  font-size: .95rem;
  font-weight: 700;
  color: var(--white);
  word-break: break-word;
}
.page-about .reach-contact__note {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: .84rem;
  line-height: 1.72;
  color: var(--slate);
}
.page-about .reach-more {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  max-width: 66ch;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--slate);
}
.page-about .reach-more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 255, .42);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .reach-more a:hover,
.page-about .reach-more a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* 响应式 */
@media (min-width: 700px) {
  .page-about .coverage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .reach-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .audit-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-section {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 48px);
  }
  .page-about .about-rail {
    flex-direction: column;
    gap: 10px;
    padding-bottom: 0;
    border-bottom: 0;
    position: sticky;
    top: calc(var(--header-h) + 20px);
    align-self: start;
  }
  .page-about .about-rail::after {
    content: "";
    display: block;
    width: 1px;
    height: clamp(34px, 6vw, 60px);
    background: linear-gradient(180deg, var(--teal), transparent);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}