.page-about {
  --about-index-size: clamp(5.25rem, 14vw, 9.5rem);
  --about-deco-color: rgba(26, 77, 46, .05);
  --about-line: rgba(26, 77, 46, .16);
  font-family: var(--font-body);
  color: var(--c-dark);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb {
  max-width: var(--container);
  margin-inline: auto;
  padding: 20px 20px 0;
  font-size: .875rem;
}

.page-about .about-breadcrumb .breadcrumb__sep {
  color: var(--c-mid);
  margin-inline: 8px;
}

.page-about .about-breadcrumb a {
  color: var(--c-primary);
  text-decoration: none;
  font-weight: 600;
}

.page-about .about-breadcrumb a:hover {
  color: var(--c-orange);
}

.page-about .about-breadcrumb [aria-current="page"] {
  color: var(--c-mid);
  font-weight: 500;
}

/* ---------- 01 品牌档案 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero .container {
  position: relative;
  padding-top: 56px;
  padding-bottom: 56px;
}

.page-about .about-hero__index {
  position: absolute;
  top: 0;
  right: -0.06em;
  z-index: 0;
  font-family: var(--font-heading);
  font-size: var(--about-index-size);
  line-height: .8;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-primary);
  opacity: .14;
  pointer-events: none;
  user-select: none;
  letter-spacing: .02em;
}

.page-about .about-hero__layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

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

.page-about .about-hero__kicker {
  display: inline-block;
  margin-bottom: 14px;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--c-orange);
  text-transform: uppercase;
}

.page-about .about-hero__main h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: .01em;
  margin: 0 0 20px;
  color: var(--c-primary-dark);
}

.page-about .about-hero__lead {
  position: relative;
  max-width: 38em;
  margin: 0 0 26px;
  padding-left: 18px;
  border-left: 3px solid var(--c-gold);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--c-dark);
}

.page-about .about-hero__intro p {
  max-width: 42em;
  margin-bottom: 12px;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--c-mid);
}

.page-about .about-hero__coords {
  margin-top: 28px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__coords .coordinate-item {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: .875rem;
}

.page-about .about-hero__coords .coordinate-item__index {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--c-primary);
}

.page-about .about-hero__coords .coordinate-item__label {
  color: var(--c-mid);
}

.page-about .about-hero__coords .coordinate-item__value {
  font-weight: 600;
  color: var(--c-dark);
  text-align: right;
}

.page-about .about-hero__side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-about .about-hero__media {
  background: var(--c-light);
  border: 1px solid var(--about-line);
}

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

.page-about .about-hero__caption {
  border-left: 2px solid var(--c-orange);
  padding-left: 10px;
  font-size: .75rem;
  line-height: 1.7;
  color: var(--c-mid);
}

.page-about .about-legend {
  border: 1px solid var(--about-line);
  background: var(--c-white);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
}

.page-about .about-legend__title {
  font-family: var(--font-heading);
  font-size: .9375rem;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: .1em;
  margin: 0 0 14px;
}

.page-about .about-legend__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-legend__item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .8125rem;
  color: var(--c-dark);
}

.page-about .about-legend__marker {
  display: inline-block;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
}

.page-about .about-legend__marker--pulse {
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(230, 126, 34, .2);
}

.page-about .about-legend__marker--square {
  background: var(--c-primary);
}

.page-about .about-legend__marker--diamond {
  background: var(--c-gold);
  transform: rotate(45deg) scale(.85);
}

.page-about .about-legend__marker--bar {
  height: 3px;
  width: 18px;
  background: var(--c-gold);
  box-shadow: 0 -6px 0 0 var(--c-primary), 0 6px 0 0 var(--c-orange);
}

/* ---------- 02 发展里程碑 ---------- */
.page-about .about-milestones {
  border-block: 1px solid var(--about-line);
}

.page-about .about-milestones .container {
  padding-top: 64px;
  padding-bottom: 72px;
}

.page-about .about-milestones__head,
.page-about .about-data__head,
.page-about .about-promise__head {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-milestones__head h2,
.page-about .about-data__head h2,
.page-about .about-promise__head h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.4vw, 2.625rem);
  line-height: 1.2;
  margin: 12px 0 12px;
  color: var(--c-primary-dark);
}

.page-about .about-milestones__head .section-lead,
.page-about .about-data__head .section-lead,
.page-about .about-promise__head .section-lead {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-mid);
  max-width: 38em;
}

.page-about .about-milestones__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about .about-milestones__timeline {
  margin: 0;
  padding: 0;
}

.page-about .about-milestone {
  position: relative;
  padding: 0 0 32px 26px;
  border-left: 1px solid rgba(26, 77, 46, .28);
}

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

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 4px;
  width: 11px;
  height: 11px;
  background: var(--c-white);
  border: 3px solid var(--c-primary);
  box-sizing: border-box;
  transform: rotate(45deg);
}

.page-about .about-milestone__year {
  display: inline-flex;
  align-items: center;
  margin-bottom: 6px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .9375rem;
  letter-spacing: .06em;
  color: var(--c-gold);
}

.page-about .about-milestone__body h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-primary-dark);
  margin: 0 0 6px;
}

.page-about .about-milestone__body p {
  max-width: 40em;
  margin: 0 0 4px;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--c-mid);
}

.page-about .about-milestone__more {
  margin-top: 8px;
  border-top: 1px dashed var(--about-line);
  padding-top: 6px;
  font-size: .875rem;
  color: var(--c-mid);
}

.page-about .about-milestone__more summary {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: .8125rem;
  font-weight: 600;
  color: var(--c-primary);
}

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

.page-about .about-milestone__more summary::before {
  content: "+";
  color: var(--c-orange);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-milestone__more[open] summary::before {
  content: "–";
}

.page-about .about-milestone__more p {
  margin-top: 8px;
  font-size: .8125rem;
  line-height: 1.7;
}

.page-about .about-milestones__side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-milestones__media {
  background: var(--c-white);
  border: 1px solid var(--about-line);
  padding: 8px;
}

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

.page-about .about-milestones__note {
  border-left: 3px solid var(--c-gold);
  padding: 4px 0 4px 16px;
}

.page-about .about-milestones__note p {
  margin: 10px 0 0;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-primary-dark);
}

/* ---------- 03 数据能力 ---------- */
.page-about .about-data .container {
  padding-top: 64px;
  padding-bottom: 72px;
}

.page-about .about-data__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-data__chart {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .about-data__chart .media-frame {
  background: var(--c-light);
  border: 1px solid var(--about-line);
}

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

.page-about .about-data__chart-note {
  border-left: 2px solid var(--c-orange);
  padding-left: 10px;
  font-size: .75rem;
  line-height: 1.6;
  color: var(--c-mid);
}

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

.page-about .about-data__stat {
  min-height: 136px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px 18px;
  background: var(--c-white);
  border: 1px solid var(--about-line);
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .about-data__stat:hover,
.page-about .about-data__stat:focus-within {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-md);
}

.page-about .about-data__stat-num {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  line-height: 1;
  font-weight: 700;
  color: var(--c-primary);
}

.page-about .about-data__stat-unit {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 600;
  color: var(--c-gold);
}

.page-about .about-data__stat p {
  margin: 10px 0 0;
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--c-mid);
}

.page-about .about-data__footnote {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 36px;
  padding: 16px 20px;
  background: var(--c-primary);
  color: var(--c-white);
  font-size: .875rem;
  line-height: 1.7;
}

.page-about .about-data__footnote .live-dot {
  flex: 0 0 auto;
  margin-top: 4px;
}

/* ---------- 04 服务承诺 ---------- */
.page-about .about-promise {
  background: var(--c-primary-dark);
  color: var(--c-white);
  border-top: 4px solid var(--c-gold);
}

.page-about .about-promise .container {
  padding-top: 64px;
  padding-bottom: 72px;
}

.page-about .about-promise__head .section-index-label {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .about-promise__head h2 {
  color: var(--c-white);
}

.page-about .about-promise__head .section-lead {
  color: rgba(255, 255, 255, .7);
}

.page-about .about-promise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-promise__item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 28px 24px 24px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .12);
  border-top-width: 3px;
  transition: background var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .about-promise__item:nth-child(1) {
  border-top-color: var(--c-gold);
}

.page-about .about-promise__item:nth-child(2) {
  border-top-color: var(--c-orange);
}

.page-about .about-promise__item:nth-child(3) {
  border-top-color: var(--c-white);
}

.page-about .about-promise__item:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, .08);
}

.page-about .about-promise__item h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-white);
  margin: 0 0 10px;
}

.page-about .about-promise__item p {
  flex: 1;
  margin: 0 0 20px;
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, .72);
}

.page-about .about-promise__item .btn {
  margin-top: auto;
}

.page-about .about-promise__item .btn-outline {
  border-color: rgba(255, 255, 255, .65);
  color: var(--c-white);
}

.page-about .about-promise__item .btn-outline:hover,
.page-about .about-promise__item .btn-outline:focus-visible {
  border-color: var(--c-white);
  background: rgba(255, 255, 255, .1);
}

/* ---------- 桌面端布局 ---------- */
@media (min-width: 992px) {
  .page-about .about-hero .container {
    padding-top: 72px;
    padding-bottom: 96px;
  }

  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
  }

  .page-about .about-milestones .container,
  .page-about .about-data .container,
  .page-about .about-promise .container {
    padding-top: 88px;
    padding-bottom: 96px;
  }

  .page-about .about-milestones__layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, .75fr);
    gap: 64px;
  }

  .page-about .about-milestones__head,
  .page-about .about-data__head,
  .page-about .about-promise__head {
    margin-bottom: 56px;
  }

  .page-about .about-data__layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-data__stats {
    gap: 18px;
  }

  .page-about .about-promise__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 28px;
  }

  .page-about .about-promise__item {
    padding: 36px 30px 28px;
  }
}