.page-about {
  --about-hair: 1px solid rgba(51, 70, 92, 0.18);
  --about-hair-dark: 1px solid rgba(183, 207, 198, 0.22);
  --about-gap: clamp(20px, 3.4vw, 44px);
}

/* ============ 封面首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--paper-100);
  padding: clamp(40px, 7vw, 96px) 0 clamp(36px, 5vw, 64px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(183, 207, 198, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(183, 207, 198, 0.055) 1px, transparent 1px);
  background-size: 76px 76px, 76px 76px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 78%);
}

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

.page-about .about-hero .qy-breadcrumb__link,
.page-about .about-hero .qy-breadcrumb__current {
  color: rgba(246, 241, 230, 0.66);
}

.page-about .about-hero .qy-breadcrumb__link:hover {
  color: var(--gold-500);
}

.page-about .about-hero__eyebrow {
  margin: clamp(18px, 3vw, 34px) 0 0;
  color: var(--celadon-200);
  letter-spacing: 0.18em;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 17ch;
  color: var(--paper-000);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 58ch;
  color: rgba(246, 241, 230, 0.8);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(28px, 4.4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair-dark);
  border: var(--about-hair-dark);
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(23px, 2.8vw, 30px);
  line-height: 1.1;
  color: var(--gold-500);
}

.page-about .about-facts__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: rgba(246, 241, 230, 0.64);
}

/* ============ 骨架与侧轨 ============ */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding: clamp(28px, 4.6vw, 64px) 0 clamp(48px, 7vw, 96px);
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: 178px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }
}

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

.page-about .about-index {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: var(--about-hair);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

@media (min-width: 900px) {
  .page-about .about-index {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
  }
}

.page-about .qy-anchor-index__link {
  display: block;
  flex: 0 0 auto;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--slate-600);
  text-decoration: none;
  padding: 7px 12px;
  border-left: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

@media (min-width: 900px) {
  .page-about .qy-anchor-index__link {
    white-space: normal;
    padding: 9px 0 9px 14px;
    border-left: 2px solid transparent;
  }
}

.page-about .qy-anchor-index__link:hover {
  color: var(--celadon-700);
}

.page-about .qy-anchor-index__link.is-active {
  color: var(--celadon-700);
  border-left-color: var(--gold-500);
}

/* ============ 章节 ============ */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .about-chapter__head {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-chapter__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--celadon-700);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(23px, 3.3vw, 34px);
  line-height: 1.3;
  color: var(--ink-900);
  max-width: 22ch;
}

.page-about .about-chapter__brief {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold-500);
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-600);
  max-width: 44ch;
}

.page-about .about-prose-lead {
  margin-top: 0;
}

/* ============ 图文对开 ============ */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: clamp(16px, 2.4vw, 26px);
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 3.6vw, 44px);
    align-items: start;
  }

  .page-about .about-split--flip .about-figure {
    order: -1;
  }
}

.page-about .about-split__text > .qy-prose + .qy-prose {
  margin-top: 14px;
}

.page-about .about-figure {
  margin: 0;
  border: var(--about-hair);
  background: var(--paper-200);
  padding: 10px 10px 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--tall img {
  aspect-ratio: 3 / 4;
}

@media (min-width: 880px) {
  .page-about .about-figure--tall img {
    aspect-ratio: 3 / 4;
  }
}

.page-about .about-figure__cap {
  display: block;
  padding: 10px 2px 12px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate-600);
}

/* ============ 服务网格图 ============ */
.page-about .about-map {
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  border: var(--about-hair);
  background: var(--paper-200);
  padding: clamp(16px, 2.6vw, 26px);
}

.page-about .about-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map__cap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  margin-top: 16px;
  padding-top: 12px;
  border-top: var(--about-hair);
  font-size: 12.5px;
  color: var(--slate-600);
}

.page-about .about-map__legend {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-map__swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

.page-about .about-map__swatch--city {
  background: var(--celadon-500);
}

.page-about .about-map__swatch--coop {
  background: var(--celadon-200);
}

.page-about .about-map__swatch--gold {
  background: transparent;
  border: 2px solid var(--gold-500);
}

.page-about .about-map__note {
  font-style: italic;
  border-bottom: 1px dotted var(--slate-600);
}

/* ============ 岗位 ============ */
.page-about .about-roles {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(51, 70, 92, 0.18);
  border: var(--about-hair);
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-roles__item {
  background: var(--paper-100);
  padding: 20px 20px 22px;
}

.page-about .about-roles__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  color: var(--celadon-700);
}

.page-about .about-roles__title {
  margin: 12px 0 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .about-roles__desc {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-600);
}

.page-about .about-flow {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ============ 资料库折叠 ============ */
.page-about .about-ledger {
  margin-top: clamp(22px, 3.2vw, 32px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(51, 70, 92, 0.18);
  border: var(--about-hair);
}

@media (min-width: 760px) {
  .page-about .about-ledger {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-ledger__item {
  background: var(--paper-100);
}

.page-about .about-ledger__item > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-900);
}

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

.page-about .about-ledger__item > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--celadon-700);
}

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

.page-about .about-ledger__item > summary:hover {
  background: var(--paper-200);
}

.page-about .about-ledger__item > p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-600);
}

/* ============ 会员分级 ============ */
.page-about .about-tiers {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(51, 70, 92, 0.18);
  border: var(--about-hair);
}

@media (min-width: 760px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-tiers__item {
  background: var(--paper-100);
  padding: 20px;
  border-top: 3px solid var(--celadon-200);
}

.page-about .about-tiers__item:nth-child(2) {
  border-top-color: var(--celadon-500);
}

.page-about .about-tiers__item:nth-child(3) {
  border-top-color: var(--gold-500);
}

.page-about .about-tiers__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .about-tiers__desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate-600);
}

/* ============ 边界三行 ============ */
.page-about .about-boundary {
  margin-top: clamp(22px, 3.2vw, 34px);
  border: var(--about-hair);
  background: var(--paper-200);
}

.page-about .about-boundary--last {
  margin-top: clamp(20px, 2.8vw, 28px);
}

.page-about .about-boundary__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  border-top: var(--about-hair);
}

.page-about .about-boundary__row:first-child {
  border-top: 0;
}

@media (min-width: 620px) {
  .page-about .about-boundary__row {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 18px;
    padding: 14px 18px;
  }
}

.page-about .about-boundary__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--celadon-700);
  padding-top: 3px;
}

.page-about .about-boundary__row--limit .about-boundary__key {
  color: var(--clay-700);
}

.page-about .about-boundary__val {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-700);
}

.page-about .about-boundary__val a {
  color: var(--celadon-700);
  text-decoration: none;
  border-bottom: 1px solid var(--celadon-200);
}

.page-about .about-boundary__val a:hover {
  border-bottom-color: var(--gold-500);
}

/* ============ 说明与联系 ============ */
.page-about .about-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(16px, 2.4vw, 24px);
}

@media (min-width: 760px) {
  .page-about .about-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
}

.page-about .about-contact {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: var(--about-hair);
  background: var(--paper-000);
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 18px;
  border-top: var(--about-hair);
}

.page-about .about-contact__row:first-child {
  border-top: 0;
}

@media (min-width: 620px) {
  .page-about .about-contact__row {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

.page-about .about-contact__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-600);
}

.page-about .about-contact__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-900);
  word-break: break-word;
}

.page-about .about-caution {
  margin-top: clamp(18px, 2.4vw, 24px);
  font-size: 15px;
  color: var(--ink-700);
}

.page-about .about-legal {
  margin: 18px 0 0;
  font-size: 13px;
  font-style: italic;
  color: var(--slate-600);
  border-bottom: 1px dotted var(--slate-600);
  display: inline-block;
  padding-bottom: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .qy-anchor-index__link,
  .page-about .about-ledger__item > summary {
    transition: none;
  }
}