.page-about {
  --about-ease: cubic-bezier(.4, 0, .2, 1);
  --about-number-color: rgba(27, 75, 158, .14);
  background: var(--paper);
}

/* ===== 首屏框景 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--grad-dawn);
  padding: 3rem 1.25rem 4rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: .375rem;
  background: var(--grad-sunrise);
  z-index: 2;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6rem;
  bottom: -8rem;
  width: 38rem;
  height: 24rem;
  background: var(--grad-sunrise);
  opacity: .3;
  transform: skewX(-18deg);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  display: grid;
  gap: 2.25rem;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 0 0 1rem;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: rgba(255, 255, 255, .82);
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 999px;
  padding: .375rem .875rem;
}

.page-about .about-hero-title {
  font-family: var(--font-head);
  font-size: 1.9rem;
  line-height: 1.18;
  color: #fff;
  margin: 0 0 1.25rem;
  max-width: 24em;
}

.page-about .about-hero-lead {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .88);
  margin: 0 0 1.5rem;
  max-width: 40rem;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-bottom: 2.25rem;
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, .2);
  padding-top: 1.5rem;
}

.page-about .about-hero-stat {
  display: grid;
  gap: .1875rem;
}

.page-about .about-hero-stat-num {
  font-family: var(--font-data);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  color: var(--sunrise-yellow);
}

.page-about .about-hero-stat-label {
  font-family: var(--font-body);
  font-size: .8125rem;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-hero-frame {
  position: relative;
  border: 1px solid rgba(255, 255, 255, .3);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .14);
  padding: .75rem;
  transform: rotate(1.2deg);
  transition: transform .4s var(--about-ease);
}

.page-about .about-hero-frame:hover {
  transform: rotate(0deg) scale(1.01);
}

.page-about .about-hero-image {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: calc(var(--radius) - .5rem);
}

/* ===== 通用章节 ===== */
.page-about .about-section {
  padding: 4.25rem 0;
}

.page-about .about-section-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .about-section-index {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.page-about .about-index-num {
  font-family: var(--font-head);
  font-size: 2.5rem;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--about-number-color);
}

.page-about .about-index-line {
  flex: 1;
  min-width: 3rem;
  height: 1px;
  background: linear-gradient(90deg, rgba(27, 75, 158, .22), transparent);
}

.page-about .about-section-label {
  margin: 0 0 .5rem;
  font-family: var(--font-body);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--morning-orange);
}

.page-about .about-section-title {
  margin: 0 0 1.25rem;
  font-family: var(--font-head);
  font-size: 1.875rem;
  line-height: 1.2;
  color: var(--ink);
}

/* ===== 01 品牌起点 ===== */
.page-about .about-origin {
  background: var(--paper);
}

.page-about .about-origin-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-origin-lead {
  margin: 0 0 1rem;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-origin-copy-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted-bluegray);
}

.page-about .about-origin-notes {
  display: grid;
  gap: 1rem;
}

.page-about .about-origin-note {
  display: flex;
  gap: .875rem;
  align-items: flex-start;
  background: var(--panel);
  border: 1px solid rgba(11, 27, 51, .1);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color .3s var(--about-ease), box-shadow .3s var(--about-ease);
}

.page-about .about-origin-note:hover {
  border-color: rgba(255, 122, 0, .45);
  box-shadow: var(--shadow-panel);
}

.page-about .about-note-dot {
  flex: 0 0 .625rem;
  width: .625rem;
  height: .625rem;
  margin-top: .375rem;
  border-radius: 50%;
  background: var(--grad-sunrise);
  box-shadow: 0 0 0 .1875rem rgba(255, 122, 0, .18);
}

.page-about .about-note-title {
  margin: 0 0 .25rem;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--ink);
}

.page-about .about-note-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: .875rem;
  line-height: 1.6;
  color: var(--muted-bluegray);
}

/* ===== 02 发展时间轴 ===== */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--paper) 0%, #ffffff 100%);
  padding-bottom: 3.5rem;
}

.page-about .about-timeline-track {
  position: relative;
  display: flex;
  gap: 1rem;
  max-width: var(--content-width);
  margin: 2.5rem auto 0;
  padding: 1rem 1.25rem 2rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline-track::-webkit-scrollbar {
  height: .375rem;
}

.page-about .about-timeline-track::-webkit-scrollbar-thumb {
  background: var(--morning-orange);
  border-radius: 999px;
}

.page-about .about-timeline-track::before {
  content: "";
  position: absolute;
  top: 1.875rem;
  left: 1.25rem;
  right: 1.25rem;
  height: .125rem;
  background: linear-gradient(90deg, var(--dawn-blue) 0%, var(--morning-orange) 100%);
  opacity: .32;
  pointer-events: none;
}

.page-about .about-timeline-card {
  position: relative;
  flex: 0 0 15.5rem;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: .375rem;
  background: var(--panel);
  border: 1px solid rgba(11, 27, 51, .1);
  border-radius: var(--radius);
  padding: 1.75rem 1.25rem 1.5rem;
  overflow: hidden;
  transition: background .35s var(--about-ease), border-color .35s var(--about-ease), transform .35s var(--about-ease), box-shadow .35s var(--about-ease);
}

.page-about .about-timeline-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: .3125rem;
  height: 100%;
  background: var(--grad-sunrise);
  transform: skewX(-14deg);
  transform-origin: top left;
  transition: width .35s var(--about-ease);
}

.page-about .about-timeline-card::after {
  content: "";
  position: absolute;
  top: .25rem;
  right: .25rem;
  width: 1.25rem;
  height: 1.25rem;
  background: linear-gradient(135deg, rgba(11, 27, 51, .07) 50%, transparent 51%);
  border-top-right-radius: calc(var(--radius) - .25rem);
  pointer-events: none;
}

.page-about .about-timeline-card:hover {
  background: linear-gradient(135deg, rgba(255, 122, 0, .14), rgba(255, 195, 0, .2)), var(--panel);
  border-color: rgba(255, 122, 0, .55);
  transform: translateY(-6px);
  box-shadow: var(--shadow-panel);
}

.page-about .about-timeline-card:hover::before {
  width: .625rem;
}

.page-about .about-timeline-num {
  display: inline-block;
  width: fit-content;
  margin-bottom: .5rem;
  font-family: var(--font-data);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--morning-orange);
  background: linear-gradient(135deg, rgba(27, 75, 158, .1), rgba(255, 122, 0, .08));
  padding: .5rem .75rem .5rem .625rem;
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
  transition: color .35s var(--about-ease), background .35s var(--about-ease);
}

.page-about .about-timeline-card:hover .about-timeline-num {
  color: var(--morning-orange);
  -webkit-text-stroke: 0;
  background: rgba(255, 255, 255, .55);
}

.page-about .about-timeline-year {
  margin-top: .5rem;
  font-family: var(--font-data);
  font-size: 1.4375rem;
  font-weight: 700;
  color: var(--dawn-blue);
  transition: color .35s var(--about-ease);
}

.page-about .about-timeline-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  color: var(--ink);
  transition: color .35s var(--about-ease);
}

.page-about .about-timeline-card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .875rem;
  line-height: 1.6;
  color: var(--muted-bluegray);
  transition: color .35s var(--about-ease);
}

.page-about .about-timeline-card:hover .about-timeline-year,
.page-about .about-timeline-card:hover h3,
.page-about .about-timeline-card:hover p {
  color: var(--dawn-blue);
}

/* ===== 03 数据与服务能力 ===== */
.page-about .about-data {
  background: var(--paper);
}

.page-about .about-data-layout {
  display: grid;
  gap: 2rem;
}

.page-about .about-data-intro {
  margin: 0 0 1.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted-bluegray);
}

.page-about .about-data-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .875rem;
}

.page-about .about-data-metric {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: .3125rem;
  background: var(--ink);
  border-radius: .875rem;
  padding: 1.25rem 1rem;
  color: #fff;
  transition: transform .3s var(--about-ease), box-shadow .3s var(--about-ease);
}

.page-about .about-data-metric:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-panel);
}

.page-about .about-data-metric::after {
  content: "";
  position: absolute;
  right: -1rem;
  bottom: -1.5rem;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: var(--grad-sunrise);
  opacity: .2;
  pointer-events: none;
}

.page-about .about-data-metric strong {
  font-family: var(--font-data);
  font-size: 1.625rem;
  line-height: 1;
  color: var(--sunrise-yellow);
}

.page-about .about-data-metric span {
  font-family: var(--font-body);
  font-size: .875rem;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-data-extra {
  font-size: .75rem;
  color: rgba(255, 255, 255, .6);
  border-top: 1px solid rgba(255, 255, 255, .2);
  padding-top: .375rem;
  margin-top: .25rem;
}

.page-about .about-data-note {
  margin: 1.25rem 0 0;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--muted-bluegray);
}

.page-about .about-text-link {
  color: var(--morning-orange);
  text-decoration-color: rgba(255, 122, 0, .35);
  text-underline-offset: .25em;
  transition: text-decoration-color .25s var(--about-ease);
}

.page-about .about-text-link:hover {
  text-decoration-color: var(--morning-orange);
}

.page-about .about-data-figure {
  position: relative;
  border: 1px solid rgba(27, 75, 158, .2);
  background: var(--ink);
  border-radius: var(--radius);
  padding: .75rem;
}

.page-about .about-data-figure::after {
  content: "数据刷新 · 5分钟";
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--sunrise-yellow);
  background: rgba(11, 27, 51, .72);
  border-radius: 999px;
  padding: .25rem .625rem;
}

.page-about .about-data-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: calc(var(--radius) - .5rem);
}

/* ===== 04 资质与认可 ===== */
.page-about .about-credentials {
  background: linear-gradient(180deg, var(--paper) 0%, rgba(27, 75, 158, .05) 100%);
}

.page-about .about-credentials-intro {
  margin: 0 0 1.75rem;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--muted-bluegray);
  max-width: 42rem;
}

.page-about .about-credentials-list {
  display: grid;
  gap: 1rem;
}

.page-about .about-credential-card {
  position: relative;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid rgba(11, 27, 51, .1);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem 1.4rem 1.75rem;
  transition: border-color .3s var(--about-ease), transform .3s var(--about-ease);
}

.page-about .about-credential-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: .3125rem;
  height: 100%;
  background: var(--grad-dawn);
}

.page-about .about-credential-card:hover {
  border-color: rgba(255, 122, 0, .4);
  transform: translateY(-4px);
}

.page-about .about-credential-badge {
  display: inline-block;
  margin-bottom: .75rem;
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--dawn-blue);
  background: rgba(27, 75, 158, .08);
  border-radius: 999px;
  padding: .25rem .625rem;
}

.page-about .about-credential-card h3 {
  margin: 0 0 .625rem;
  font-family: var(--font-head);
  font-size: 1.125rem;
  color: var(--ink);
}

.page-about .about-credential-card p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.65;
  color: var(--muted-bluegray);
}

/* ===== 05 合作伙伴 ===== */
.page-about .about-partners {
  background: var(--panel);
  padding-bottom: 5rem;
}

.page-about .about-partners-layout {
  display: grid;
  gap: 2rem;
}

.page-about .about-partners-lead {
  margin: 0 0 1.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted-bluegray);
}

.page-about .about-partners-list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: .875rem;
}

.page-about .about-partners-list li {
  display: flex;
  gap: .875rem;
  align-items: flex-start;
  background: var(--paper);
  border: 1px solid rgba(11, 27, 51, .08);
  border-radius: .875rem;
  padding: 1.125rem;
  transition: background .3s var(--about-ease), border-color .3s var(--about-ease);
}

.page-about .about-partners-list li:hover {
  background: var(--panel);
  border-color: rgba(255, 122, 0, .4);
}

.page-about .about-partner-dot {
  flex: 0 0 .625rem;
  width: .625rem;
  height: .625rem;
  margin-top: .375rem;
  border-radius: 50%;
  background: var(--dawn-blue-soft);
  box-shadow: 0 0 0 .1875rem rgba(74, 123, 200, .18);
  transition: background .3s var(--about-ease), box-shadow .3s var(--about-ease);
}

.page-about .about-partners-list li:hover .about-partner-dot {
  background: var(--morning-orange);
  box-shadow: 0 0 0 .25rem rgba(255, 122, 0, .16);
}

.page-about .about-partners-list h3 {
  margin: 0 0 .25rem;
  font-family: var(--font-head);
  font-size: .9375rem;
  color: var(--ink);
}

.page-about .about-partners-list p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .875rem;
  line-height: 1.6;
  color: var(--muted-bluegray);
}

.page-about .about-partners-foot {
  margin: 1.5rem 0 0;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--muted-bluegray);
}

.page-about .about-partners-figure {
  border: 1px solid rgba(11, 27, 51, .1);
  background: var(--paper);
  border-radius: var(--radius);
  padding: .75rem;
}

.page-about .about-partners-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: calc(var(--radius) - .5rem);
}

/* ===== hover 设备上数据卡片的展开细节 ===== */
@media (hover: hover) {
  .page-about .about-data-extra {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .3s var(--about-ease), opacity .3s var(--about-ease), margin-top .3s var(--about-ease), padding-top .3s var(--about-ease);
  }

  .page-about .about-data-metric:hover .about-data-extra {
    max-height: 4rem;
    margin-top: .25rem;
    padding-top: .375rem;
    border-top: 1px solid rgba(255, 255, 255, .2);
    opacity: 1;
  }
}

/* ===== 桌面端布局 ===== */
@media (min-width: 64rem) {
  .page-about .about-hero {
    padding: 6rem 1.25rem 6.5rem;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .about-hero-title {
    font-size: 3.2rem;
  }

  .page-about .about-hero-lead {
    font-size: 1.125rem;
  }

  .page-about .about-section {
    padding: 6.25rem 0;
  }

  .page-about .about-section-title {
    font-size: 2.5rem;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-bottom: 5rem;
  }

  .page-about .about-timeline-track {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1.25rem;
    overflow: visible;
    scroll-snap-type: none;
    padding-bottom: 3rem;
  }

  .page-about .about-timeline-card {
    flex: none;
  }

  .page-about .about-data-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: center;
  }

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

  .page-about .about-data-metric {
    padding: 1.5rem 1.25rem;
  }

  .page-about .about-credentials-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-partners-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .about-partners-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
  }
}