.page-about {
  --about-line-w: 2px;
  --about-note: rgba(252, 252, 253, 0.62);
  background: var(--bg-base);
  color: var(--ink);
  line-height: 1.75;
  position: relative;
}

.page-about .page-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-5) var(--space-9);
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-6);
}

/* ===== Hero 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: var(--space-7) 0 var(--space-7);
  max-width: 1000px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 6px;
  background: var(--red);
  transform: skewX(-18deg);
}

.page-about .about-hero__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}

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

.page-about .about-hero__est {
  font-size: var(--fs-small);
  color: var(--gray);
  letter-spacing: 0.08em;
}

.page-about .about-hero h1 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: var(--fs-hero);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-5);
  max-width: 13em;
}

.page-about .about-hero h1::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 0.92em;
  margin-right: var(--space-3);
  background: var(--red);
  transform: skewX(-18deg);
  vertical-align: -0.08em;
}

.page-about .about-hero__lead {
  font-family: var(--font-serif);
  font-size: var(--fs-body);
  max-width: 44em;
  color: var(--ink);
  padding-left: var(--space-4);
  border-left: 3px solid var(--red);
  margin: 0;
}

.page-about .about-hero__kpis {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-about .about-hero__kpi {
  padding: var(--space-4);
  min-height: 88px;
  justify-content: space-between;
}

.page-about .about-hero__kpi .data-panel__value {
  font-size: 24px;
  font-weight: 800;
  color: var(--cyan);
}

/* ===== 页面章节统一 ===== */
.page-about .page-section {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--track-gray);
  position: relative;
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.page-about .about-section-head .section-title__index {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--red);
  width: 52px;
  flex-shrink: 0;
}

.page-about .about-section-head .section-title__text {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: var(--fs-section);
  letter-spacing: -0.01em;
}

.page-about .section-lead {
  font-family: var(--font-serif);
  font-size: 17px;
  max-width: 46em;
  margin: 0 0 var(--space-6);
  padding-left: var(--space-4);
  border-left: 3px solid var(--red);
  color: var(--ink);
}

/* ===== 时间线 ===== */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__deco {
  position: absolute;
  top: var(--space-6);
  right: 0;
  width: 90px;
  height: 90px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-timeline__layout {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.page-about .about-timeline__yearlist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-about .about-timeline__yearlink {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--track-gray);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-timeline__yearlink small {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--gray);
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__yearlink:hover {
  border-color: var(--red);
}

.page-about .about-timeline__yearlink.is-current {
  background: var(--red);
  border-color: var(--red);
  color: var(--bg-paper);
}

.page-about .about-timeline__yearlink.is-current small {
  color: rgba(252, 252, 253, 0.76);
}

.page-about .about-timeline__events {
  position: relative;
  border-left: var(--about-line-w) solid var(--track-gray);
  padding-left: var(--space-5);
  display: grid;
  gap: var(--space-6);
}

.page-about .about-timeline__event {
  background: var(--bg-paper);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: box-shadow var(--dur-slow) var(--ease);
}

.page-about .about-timeline__event::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-5) - 8px);
  top: var(--space-6);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--red);
  border: 3px solid var(--bg-paper);
  box-sizing: border-box;
  box-shadow: 0 0 0 1px rgba(228, 61, 48, 0.3);
}

.page-about .about-timeline__event.is-active {
  box-shadow: var(--shadow-md);
}

.page-about .about-timeline__event.is-active .about-timeline__event-year {
  color: var(--red);
}

.page-about .about-timeline__event--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 201, 167, 0.18);
}

.page-about .about-timeline__event-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.page-about .about-timeline__event-year {
  font-size: 26px;
  font-weight: 800;
  color: var(--blue-deep);
  letter-spacing: 0.02em;
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__event-head h3 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 22px;
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__event-body {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-timeline__event-copy p {
  margin: 0 0 var(--space-3);
  font-size: 16px;
}

.page-about .about-timeline__event-copy .btn {
  margin-top: var(--space-2);
}

.page-about .about-timeline__src-link {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15px;
  color: var(--purple);
  text-decoration: none;
  margin-top: var(--space-2);
}

.page-about .about-timeline__src-link:hover {
  text-decoration: underline;
}

.page-about .media-cover {
  overflow: hidden;
  position: relative;
}

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

.page-about .media-cover__label {
  display: block;
  position: relative;
  z-index: 1;
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gray);
  background: var(--bg-paper);
  border-left: 3px solid var(--red);
  margin-top: var(--space-2);
  padding: var(--space-1) var(--space-3);
}

/* ===== 内容生产流程 ===== */
.page-about .about-process__layout {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

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

.page-about .about-process__step {
  border-top: 1px solid var(--track-gray);
  padding: var(--space-5) 0;
}

.page-about .about-process__step-num {
  display: inline-block;
  font-size: 22px;
  font-weight: 800;
  color: var(--red);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-2);
}

.page-about .about-process__step-title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 20px;
  margin: 0 0 var(--space-2);
}

.page-about .about-process__step p {
  font-size: 16px;
  margin: 0;
  max-width: 34em;
}

.page-about .about-process__side {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.page-about .about-process__media .media-cover__label {
  margin-top: var(--space-2);
}

.page-about .about-process__team {
  padding: var(--space-5);
  background: rgba(252, 252, 253, 0.66);
  border-left: 3px solid var(--purple);
}

.page-about .about-process__team-label {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 18px;
  margin: 0 0 var(--space-4);
  color: var(--blue-deep);
}

.page-about .about-process__team-num {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: 16px;
  margin: var(--space-2) 0;
}

.page-about .about-process__team-num strong {
  font-size: 28px;
  color: var(--red);
}

.page-about .about-process__team-note {
  font-size: var(--fs-small);
  color: var(--gray);
  margin: var(--space-4) 0 0;
  padding-top: var(--space-3);
  border-top: 1px solid rgba(209, 215, 224, 0.72);
}

/* ===== 规模与覆盖范围 ===== */
.page-about .about-stats__panel {
  background: var(--blue-deep);
  color: var(--bg-paper);
  padding: var(--space-6);
  margin-top: var(--space-5);
  position: relative;
  overflow: hidden;
}

.page-about .about-stats__panel::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle at 0 0, rgba(0, 201, 167, 0.28), transparent 62%);
  pointer-events: none;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  position: relative;
  z-index: 1;
}

.page-about .about-stat__num {
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 900;
  color: var(--cyan);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-stat__label {
  font-size: var(--fs-small);
  color: rgba(252, 252, 253, 0.62);
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.page-about .about-stats__map {
  margin-top: var(--space-5);
  position: relative;
  z-index: 1;
}

.page-about .about-stats__map img {
  border: 1px solid rgba(252, 252, 253, 0.16);
}

.page-about .about-stats__map .media-cover__label {
  background: var(--blue-deep);
  color: rgba(252, 252, 253, 0.72);
  border-left-color: var(--red);
}

.page-about .about-stats__note {
  font-size: 15px;
  color: rgba(252, 252, 253, 0.62);
  margin: var(--space-5) 0 0;
  max-width: 46em;
  position: relative;
  z-index: 1;
}

/* ===== 中国区服务边界 ===== */
.page-about .about-boundary__links {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-about .about-boundary__card {
  display: block;
  padding: var(--space-5) var(--space-6);
  background: var(--bg-paper);
  border-left: 3px solid var(--red);
  box-shadow: var(--shadow-sm);
  color: var(--ink);
  text-decoration: none;
  transition: box-shadow var(--dur-slow) var(--ease), border-color var(--dur-slow) var(--ease);
}

.page-about .about-boundary__card:hover,
.page-about .about-boundary__card:focus-visible {
  box-shadow: var(--shadow-md);
  border-left-color: var(--purple);
}

.page-about .about-boundary__card-k {
  display: inline-block;
  font-size: 18px;
  font-weight: 800;
  color: var(--red);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.page-about .about-boundary__card h3 {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 20px;
  margin: 0 0 var(--space-2);
}

.page-about .about-boundary__card p {
  font-size: 15px;
  margin: 0;
  color: var(--ink);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 900px) {
  .page-about .page-wrap {
    padding: var(--space-7) var(--space-7) var(--space-9);
  }

  .page-about .about-hero {
    padding: var(--space-9) 0 var(--space-8);
  }

  .page-about .about-hero__kpis {
    grid-template-columns: repeat(4, 1fr);
    max-width: 720px;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 190px 1fr;
    column-gap: var(--space-6);
  }

  .page-about .about-timeline__years {
    position: sticky;
    top: var(--space-7);
    align-self: start;
  }

  .page-about .about-timeline__yearlist {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    border-left: var(--about-line-w) solid var(--track-gray);
  }

  .page-about .about-timeline__yearlink {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
    border: 0;
    border-left: 4px solid transparent;
    border-radius: 0;
    padding: var(--space-3) var(--space-4);
    margin-left: -3px;
  }

  .page-about .about-timeline__yearlink.is-current {
    background: transparent;
    border-left-color: var(--red);
    color: var(--ink);
  }

  .page-about .about-timeline__yearlink.is-current small {
    color: var(--red);
  }

  .page-about .about-timeline__events {
    gap: var(--space-7);
    padding-left: var(--space-6);
  }

  .page-about .about-timeline__event {
    padding: var(--space-6);
  }

  .page-about .about-timeline__event::before {
    left: calc(-1 * var(--space-6) - 8px);
  }

  .page-about .about-timeline__event--with-media .about-timeline__event-body {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: center;
  }

  .page-about .about-process__layout {
    grid-template-columns: 1fr 340px;
    column-gap: var(--space-7);
    align-items: start;
  }

  .page-about .about-process__side {
    position: sticky;
    top: var(--space-7);
  }

  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-about .about-boundary__card {
    padding: var(--space-6);
  }
}

@media (min-width: 1200px) {
  .page-about .about-timeline__deco {
    width: 120px;
    height: 120px;
  }
}