.page-about {
  --about-year-w: 86px;
  --about-line: rgba(143, 169, 173, 0.42);
  --about-soft-line: rgba(143, 169, 173, 0.38);
  background-color: var(--c-snow);
  color: var(--c-ink);
  font-family: var(--font-body);
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(22px, 4vw, 46px) 0 clamp(42px, 7vw, 84px);
  background: linear-gradient(202deg, rgba(191, 227, 232, 0.5), rgba(247, 250, 249, 0) 62%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(23, 107, 135, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23, 107, 135, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, #000 8%, transparent 82%);
  mask-image: linear-gradient(to bottom, #000 8%, transparent 82%);
}

.page-about .about-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-lake);
}

.page-about .about-eyebrow::before {
  content: "";
  flex: none;
  width: 26px;
  height: 2px;
  background: var(--c-gold);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--gap-lg);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--c-indigo);
  text-wrap: balance;
}

.page-about .about-hero__text {
  max-width: 46ch;
  margin-top: clamp(16px, 2vw, 22px);
  font-size: clamp(16px, 1.5vw, 18px);
  color: #33505c;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* 概览玻璃卡 */
.page-about .about-panel {
  padding: clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius-card);
  border: 1px solid rgba(23, 107, 135, 0.18);
  background: linear-gradient(158deg, rgba(255, 255, 255, 0.9), rgba(191, 227, 232, 0.42));
  box-shadow: 0 30px 70px -52px rgba(11, 46, 79, 0.82);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.page-about .about-panel__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-lake);
  margin-bottom: 8px;
}

.page-about .about-figure {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-block: 13px;
  border-top: 1px solid var(--about-soft-line);
}

.page-about .about-panel__title + .about-figure {
  border-top: 0;
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.4vw, 27px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-lake);
  white-space: nowrap;
}

.page-about .about-figure__num small {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-indigo);
  margin-left: 2px;
}

.page-about .about-figure__label {
  font-size: 13.5px;
  color: #42606c;
  text-align: right;
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding-block: clamp(46px, 6.5vw, 88px);
}

.page-about .about-section--mist {
  background: var(--c-mist);
}

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

.page-about .about-head {
  max-width: 58ch;
}

.page-about .about-head h2 {
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--c-indigo);
}

.page-about .about-head p {
  margin-top: 14px;
  font-size: clamp(15.5px, 1.4vw, 17px);
  color: #33505c;
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .media__frame {
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--about-soft-line);
  background: var(--c-mist);
}

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

.page-about .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: #4d6772;
}

/* ---------- 焕新理念 ---------- */
.page-about .about-idea-grid {
  display: grid;
  gap: var(--gap-lg);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-idea-copy p {
  font-size: clamp(15.5px, 1.4vw, 17px);
  color: #33505c;
}

.page-about .about-idea-copy p + p {
  margin-top: 16px;
}

/* ---------- 资料服务能力 ---------- */
.page-about .about-shelf {
  display: grid;
  gap: var(--gap-lg);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-shelf-intro {
  font-size: clamp(15.5px, 1.4vw, 17px);
  color: #33505c;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(23, 107, 135, 0.3);
  background: var(--c-snow);
  color: var(--c-indigo);
  font-size: 14px;
  line-height: 1.35;
  cursor: help;
  transition: background 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}

.page-about .about-tag::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-data);
}

.page-about .about-tag:hover,
.page-about .about-tag:focus-visible {
  background: rgba(191, 227, 232, 0.6);
  border-color: var(--c-lake);
  transform: translateY(-2px);
}

.page-about .about-tag:focus-visible {
  outline: 2px solid var(--c-lake);
  outline-offset: 3px;
}

.page-about .about-tag__note {
  position: absolute;
  left: 0;
  top: calc(100% + 9px);
  z-index: 4;
  width: max-content;
  max-width: 250px;
  padding: 9px 12px;
  border-radius: 10px;
  background: var(--c-indigo);
  color: var(--c-snow);
  font-size: 12.5px;
  line-height: 1.55;
  text-align: left;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
}

.page-about .about-tag:hover .about-tag__note,
.page-about .about-tag:focus-visible .about-tag__note {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-fact strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-lake);
}

.page-about .about-fact span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: #4d6772;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: var(--gap-md);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
}

.page-about .about-years a {
  flex: none;
  padding: 6px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(23, 107, 135, 0.28);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-lake);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  background: var(--c-lake);
  border-color: var(--c-lake);
  color: var(--c-snow);
}

.page-about .about-years a:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 3px;
}

.page-about .about-era {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.6vw, 30px);
  border-radius: var(--radius-card);
  border: 1px solid var(--about-soft-line);
  border-left: 3px solid var(--c-lake);
  background: rgba(247, 250, 249, 0.94);
  scroll-margin-top: 96px;
}

.page-about .about-era + .about-era {
  margin-top: 16px;
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-lake);
}

.page-about .about-era h3 {
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.35;
  color: var(--c-indigo);
}

.page-about .about-era p {
  margin-top: 8px;
  font-size: 15px;
  color: #3d5a66;
}

.page-about .about-era__tag {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  background: rgba(191, 227, 232, 0.62);
  color: var(--c-indigo);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--gap-lg);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-team-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-team-list .mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--c-lake);
  padding-top: 4px;
}

.page-about .about-team-list h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--c-indigo);
}

.page-about .about-team-list p {
  margin-top: 5px;
  font-size: 14.5px;
  line-height: 1.7;
  color: #45606b;
}

/* ---------- 资质与伙伴 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.page-about .about-partners li {
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--about-soft-line);
  border-top: 2px solid var(--c-lake);
  background: linear-gradient(152deg, rgba(255, 255, 255, 0.94), rgba(237, 243, 242, 0.7));
}

.page-about .about-partners h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--c-indigo);
}

.page-about .about-partners p {
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.65;
  color: #45606b;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  background: var(--c-indigo);
  color: var(--c-snow);
}

.page-about .about-promise .about-eyebrow {
  color: var(--c-shallow);
}

.page-about .about-promise .about-head h2 {
  color: var(--c-snow);
}

.page-about .about-promise-list {
  list-style: none;
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-promise-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid rgba(191, 227, 232, 0.22);
}

.page-about .about-promise-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-promise-list .mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--c-gold-soft);
  padding-top: 4px;
}

.page-about .about-promise-list p {
  font-size: clamp(15px, 1.4vw, 16.5px);
  color: rgba(247, 250, 249, 0.88);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid rgba(191, 227, 232, 0.22);
}

.page-about .about-cta .btn--ghost {
  color: var(--c-snow);
  border-color: rgba(247, 250, 249, 0.46);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-gold-soft);
}

.page-about .about-cta__link {
  font-size: 14px;
  color: var(--c-shallow);
  text-decoration: none;
  border-bottom: 1px solid rgba(191, 227, 232, 0.5);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--c-snow);
  border-color: var(--c-gold);
}

/* ---------- 窄屏收起提示气泡 ---------- */
@media (max-width: 719px) {
  .page-about .about-tags {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-tag {
    flex-wrap: wrap;
    border-radius: 14px;
    padding: 12px 14px;
    cursor: default;
  }

  .page-about .about-tag__note {
    position: static;
    width: auto;
    max-width: none;
    padding: 0;
    margin-top: 2px;
    flex-basis: 100%;
    background: none;
    color: #45606b;
    opacity: 1;
    visibility: visible;
    transform: none;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 720px) and (max-width: 899px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .about-panel__title {
    grid-column: 1 / -1;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: end;
    gap: var(--gap-xl);
  }

  .page-about .about-idea-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: var(--gap-xl);
    align-items: center;
  }

  .page-about .about-shelf {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: var(--gap-xl);
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: var(--about-year-w) minmax(0, 1fr);
    gap: var(--gap-xl);
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: 96px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0 14px 0 0;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-years a {
    border: 0;
    border-radius: 0;
    padding: 8px 0;
    background: none;
    color: var(--c-salt);
    font-size: 15px;
    letter-spacing: 0.08em;
  }

  .page-about .about-years a:hover,
  .page-about .about-years a:focus-visible {
    background: none;
    border-color: transparent;
    color: var(--c-lake);
  }

  .page-about .about-era:nth-child(even) {
    margin-left: clamp(16px, 4vw, 54px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--gap-xl);
    align-items: center;
  }
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.42s ease, transform 0.42s ease;
    transition-delay: var(--reveal-delay, 0ms);
  }

  .page-about [data-reveal].is-revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .page-about .about-tag,
  .page-about .about-years a,
  .page-about .about-cta__link {
    transition: none;
  }
}

/* 说明：以上为 page-about 页面专属样式，全部选择器限定在 .page-about 作用域内，未重定义共享头部与页脚。 */

.page-about {
  --reveal-delay: 0.3s;
}