.page-about {
  --about-idx-w: 172px;
  --about-gap: 46px;
  --about-muted: #5A6479;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  padding: 22px 0 0;
  background: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding: 22px 0 32px;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--teal-700);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(36px, 7vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--about-muted);
  padding-left: 12px;
  border-left: 2px solid var(--amber-500);
}

.page-about .about-hero__panel {
  position: relative;
  background: var(--indigo-900);
  background-image: linear-gradient(rgba(211, 218, 232, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(211, 218, 232, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  padding: 20px 20px 16px;
  color: var(--text-dark-1);
}

.page-about .about-hero__panel-title {
  margin: 0 0 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--teal-500);
}

.page-about .about-hero__rows {
  margin: 0;
}

.page-about .about-hero__row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  padding: 9px 0;
  border-top: var(--hair-dark);
  align-items: baseline;
}

.page-about .about-hero__row dt {
  font-size: 12px;
  color: var(--text-dark-2);
}

.page-about .about-hero__row dd {
  margin: 0;
  font-size: 14px;
  color: var(--text-dark-1);
  word-break: break-all;
}

/* ============ 数字带 ============ */
.page-about .about-band {
  background: var(--paper);
  border-top: var(--hair);
  border-bottom: var(--hair);
}

.page-about .about-band__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 4px 0;
}

.page-about .about-band__cell {
  padding: 16px 0 14px;
  border-bottom: var(--hair);
}

.page-about .about-band__cell:nth-child(2n) {
  border-left: var(--hair);
  padding-left: 16px;
}

.page-about .about-band__key {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--about-muted);
}

.page-about .about-band__num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 6px 0 0;
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 500;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-band__unit {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--about-muted);
}

.page-about .about-band__note {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .about-band__src {
  margin: 0 0 16px;
  padding-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--about-muted);
}

/* ============ 布局骨架 ============ */
.page-about .about-layout {
  padding-top: 0;
  padding-bottom: 40px;
}

.page-about .about-index {
  position: sticky;
  top: var(--top-h);
  z-index: 4;
  background: var(--paper);
  border-bottom: var(--hair);
  padding: 10px 0 8px;
}

.page-about .about-index__title {
  display: none;
}

.page-about .about-index__list {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--about-muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--teal-700);
  border-bottom-color: var(--teal-500);
}

.page-about .about-index__num {
  font-size: 11px;
  color: var(--teal-500);
}

/* ============ 章节 ============ */
.page-about .about-sec {
  padding: 34px 0 40px;
  border-top: var(--hair);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 18px;
}

.page-about .about-sec__index {
  margin: 0;
  font-size: 30px;
  font-weight: 500;
  line-height: 0.95;
  color: var(--teal-700);
}

.page-about .about-sec__kicker {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--about-muted);
}

.page-about .about-sec__title {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-copy {
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-copy p {
  margin: 0 0 12px;
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-copy--lead {
  margin: 0 0 20px;
  color: var(--ink);
}

.page-about .about-copy--lead .mono {
  color: var(--indigo-900);
  font-weight: 500;
}

/* ============ 02 口径治理 ============ */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.page-about .about-code {
  border: var(--hair);
  background: var(--white);
  padding: 16px 18px 14px;
}

.page-about .about-code__label {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--about-muted);
}

.page-about .about-code__value {
  margin: 10px 0 12px;
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 500;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-code__value span {
  color: var(--teal-500);
  padding: 0 2px;
}

.page-about .about-code__parts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  padding: 12px 0 0;
  border-top: var(--hair);
  list-style: none;
  font-size: 12.5px;
  color: var(--about-muted);
}

.page-about .about-code__parts .mono {
  color: var(--teal-700);
  font-weight: 500;
  margin-right: 4px;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink);
  border: var(--hair);
  background: var(--white);
  padding: 6px 12px 6px 8px;
}

.page-about .about-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 22px;
  border-top: var(--hair);
}

.page-about .about-audience__col {
  padding: 14px 0 12px;
  border-bottom: var(--hair);
}

.page-about .about-audience__title {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--teal-700);
}

.page-about .about-audience__col p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* ============ 03 制造协同 ============ */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-filter__btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  padding: 9px 14px;
  color: var(--indigo-900);
  background: var(--white);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-filter__btn:hover {
  border-color: var(--teal-500);
  color: var(--teal-700);
}

.page-about .about-filter__btn:focus-visible {
  outline: 2px solid var(--teal-500);
  outline-offset: 2px;
}

.page-about .about-filter__btn[aria-pressed="true"] {
  background: var(--indigo-900);
  border-color: var(--indigo-900);
  color: var(--teal-500);
}

.page-about .about-factories {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-factory {
  border: var(--hair);
  background: var(--white);
  padding: 16px 16px 14px;
}

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

.page-about .about-factory__region {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-factory__num {
  font-size: 26px;
  font-weight: 500;
  line-height: 1;
  color: var(--teal-700);
}

.page-about .about-factory__bar {
  height: 5px;
  margin: 12px 0 10px;
  background: var(--line);
}

.page-about .about-factory__fill {
  display: block;
  height: 100%;
  background: var(--teal-500);
}

.page-about .about-factory__fill--a { width: 38.9%; }
.page-about .about-factory__fill--b { width: 33.3%; background: var(--indigo-700); }
.page-about .about-factory__fill--c { width: 27.8%; background: var(--metal-500); }

.page-about .about-factory__meta {
  margin: 0 0 8px;
  font-size: 12.5px;
  color: var(--about-muted);
}

.page-about .about-factory__meta .mono {
  color: var(--ink);
  font-weight: 500;
}

.page-about .about-factory__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-checks {
  margin-top: 26px;
  border-top: 1px solid var(--indigo-900);
  border-bottom: var(--hair);
  padding: 14px 0 4px;
}

.page-about .about-checks__title {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--about-muted);
}

.page-about .about-checks__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-checks__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 8px;
  padding: 11px 0;
  border-top: var(--hair);
  font-size: 14px;
}

.page-about .about-checks__key {
  flex: 0 0 84px;
  font-size: 12.5px;
  color: var(--about-muted);
}

.page-about .about-checks__val {
  font-size: 20px;
  font-weight: 500;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-checks__unit {
  font-size: 12.5px;
  color: var(--about-muted);
}

.page-about .about-checks__hint {
  flex: 1 1 100%;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .about-media {
  margin: 26px 0 0;
  border: var(--hair);
  background: var(--white);
}

.page-about .about-media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-media .media__caption {
  margin: 0;
  padding: 10px 14px;
  border-top: var(--hair);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--about-muted);
}

/* ============ 04 专利 ============ */
.page-about .about-patent {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
  margin-bottom: 8px;
}

.page-about .about-donut-wrap {
  max-width: 260px;
  width: 100%;
  justify-self: center;
}

.page-about .about-donut {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-donut__arc--a { stroke: var(--teal-500); }
.page-about .about-donut__arc--b { stroke: var(--indigo-700); }
.page-about .about-donut__arc--c { stroke: var(--amber-500); }

.page-about .about-donut__val {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  fill: var(--indigo-900);
}

.page-about .about-donut__unit {
  font-family: var(--font-body);
  font-size: 6px;
  fill: var(--metal-500);
}

.page-about .about-legend {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--hair);
}

.page-about .about-legend__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 8px;
  padding: 13px 0;
  border-bottom: var(--hair);
}

.page-about .about-legend__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  align-self: center;
  background: var(--teal-500);
}

.page-about .about-legend__dot--b { background: var(--indigo-700); }
.page-about .about-legend__dot--c { background: var(--amber-500); }

.page-about .about-legend__name {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-legend__val {
  margin-left: auto;
  font-size: 20px;
  font-weight: 500;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-legend__unit {
  font-size: 12.5px;
  color: var(--about-muted);
}

.page-about .about-legend__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--about-muted);
}

/* ============ 05 体系 ============ */
.page-about .about-systems {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: var(--hair);
  margin-bottom: 24px;
}

.page-about .about-system {
  padding: 16px 0;
  border-bottom: var(--hair);
}

.page-about .about-system__idx {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--teal-500);
}

.page-about .about-system__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-system__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-system__text .mono {
  color: var(--indigo-900);
  font-weight: 500;
}

.page-about .about-qc {
  background: var(--indigo-900);
  padding: 18px 18px 16px;
}

.page-about .about-qc__lead {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-dark-1);
}

.page-about .about-qc__num {
  color: var(--amber-500);
  font-size: 24px;
  margin-right: 6px;
}

.page-about .about-qc__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dark-2);
}

/* ============ 06 团队 ============ */
.page-about .about-team {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--hair);
}

.page-about .about-team__row {
  padding: 16px 0 14px;
  border-bottom: var(--hair);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-team__name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team__num {
  margin-left: auto;
  font-size: 24px;
  font-weight: 500;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-team__unit {
  font-size: 12.5px;
  color: var(--about-muted);
}

.page-about .about-team__bar {
  height: 4px;
  margin: 10px 0 10px;
  background: var(--line);
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  background: var(--teal-500);
}

.page-about .about-team__fill--a { width: 100%; }
.page-about .about-team__fill--b { width: 33.3%; background: var(--indigo-700); }
.page-about .about-team__fill--c { width: 11.1%; background: var(--amber-500); }

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-team__text .mono {
  color: var(--indigo-900);
  font-weight: 500;
}

/* ============ 07 区域 ============ */
.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
}

.page-about .about-cities__item {
  font-size: 13px;
  line-height: 1;
  padding: 7px 12px;
  border: var(--hair);
  background: var(--white);
  color: var(--about-muted);
}

.page-about .about-cities__item--key {
  border-color: var(--teal-500);
  background: rgba(15, 181, 166, 0.08);
  color: var(--teal-700);
  font-weight: 600;
  padding-left: 22px;
  position: relative;
}

.page-about .about-cities__item--key::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  background: var(--teal-500);
}

.page-about .about-cities__note {
  margin: 0 0 24px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--about-muted);
}

.page-about .about-sla {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--indigo-900);
}

.page-about .about-sla__cell {
  padding: 16px 0 14px;
  border-bottom: var(--hair);
}

.page-about .about-sla__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 6px;
  font-size: clamp(24px, 4.5vw, 32px);
  font-weight: 500;
  line-height: 1;
  color: var(--indigo-900);
}

.page-about .about-sla__num span {
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--about-muted);
}

.page-about .about-sla__cell--amber .about-sla__num {
  color: var(--amber-700);
}

.page-about .about-sla__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

/* ============ 结尾 ============ */
.page-about .about-outro {
  background: var(--indigo-900);
  padding: 36px 0 40px;
}

.page-about .about-outro__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-dark-1);
}

.page-about .about-outro__text {
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dark-2);
}

.page-about .about-outro__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--hair-dark);
}

.page-about .about-outro__link {
  display: block;
  padding: 13px 0;
  border-bottom: var(--hair-dark);
  font-size: 14px;
  color: var(--text-dark-1);
  text-decoration: none;
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .about-outro__link:hover,
.page-about .about-outro__link:focus-visible {
  color: var(--teal-500);
  padding-left: 6px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-band__cell {
    border-bottom: 0;
    border-left: var(--hair);
    padding-left: 18px;
  }

  .page-about .about-band__cell:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-factories {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-patent {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .about-donut-wrap {
    justify-self: start;
  }

  .page-about .about-sla {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-sla__cell {
    border-bottom: 0;
    border-left: var(--hair);
    padding-left: 18px;
  }

  .page-about .about-sla__cell:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }

  .page-about .about-outro__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    gap: 44px;
    padding: 30px 0 44px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    padding: 24px 26px 20px;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 10px;
    padding-bottom: 64px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--top-h) + 28px);
    align-self: start;
    z-index: 1;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 14px;
  }

  .page-about .about-index__title {
    display: block;
    margin: 0 0 10px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.14em;
    color: var(--about-muted);
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    gap: 0;
  }

  .page-about .about-index__item {
    margin-bottom: 1px;
  }

  .page-about .about-index__link {
    display: flex;
    gap: 10px;
    width: 100%;
    font-size: 13.5px;
    padding: 6px 0;
    border-bottom: 0;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    padding-left: 4px;
  }

  .page-about .about-index__num {
    font-size: 11px;
  }

  .page-about .about-sec {
    padding: 40px 0 48px;
  }

  .page-about .about-sec__head {
    gap: 20px;
    margin-bottom: 22px;
  }

  .page-about .about-sec__index {
    font-size: 38px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 34px;
  }

  .page-about .about-systems {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .about-system {
    border-bottom: 0;
    border-top: var(--hair);
    padding-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-filter__btn,
  .page-about .about-outro__link {
    transition: none;
  }
}