.page-about {
  --about-year-w: 148px;
  --about-gap: 32px;
  background: var(--paper);
  color: var(--text-ink);
}

/* 首屏框景 */
.page-about .about-hero {
  padding-top: 8px;
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: 20px;
  padding: clamp(28px, 5vw, 64px) clamp(20px, 4vw, 56px) clamp(24px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: linear-gradient(180deg, var(--paper) 0%, var(--paper-alt) 100%);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 14px);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 132px;
  height: 132px;
  border: 2px solid var(--sand-gold);
  border-radius: 50%;
  opacity: 0.34;
  pointer-events: none;
}

.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.26;
  letter-spacing: 0.02em;
  color: var(--ink-navy);
  margin: 16px 0 0;
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin-top: 22px;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--text-ink);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 36px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.1;
  color: var(--ink-navy);
  font-variant-numeric: tabular-nums;
}

.page-about .fact__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* 宽幅图 */
.page-about .about-banner {
  margin-top: clamp(48px, 7vw, 96px);
}

.page-about .about-detail {
  margin-top: clamp(48px, 7vw, 96px);
}

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

.page-about .media {
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

/* 行业场景 */
.page-about .scene-grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .scene {
  padding: 26px 0;
  border-top: 1px dashed var(--line);
}

.page-about .scene__tag {
  display: inline-block;
  padding: 3px 12px;
  border: 1px solid var(--ink-navy);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink-navy);
  margin: 0 0 12px;
}

.page-about .scene__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.6;
  color: var(--ink-navy);
  margin: 0 0 10px;
}

.page-about .scene__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-ink);
}

/* 能力构成 */
.page-about .cap-list {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  counter-reset: none;
}

.page-about .cap {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
  transition: background-color 0.24s var(--ease);
}

.page-about .cap:hover {
  background-color: var(--sand-light);
}

.page-about .cap__num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 30px;
  line-height: 1.2;
  color: var(--sand-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .cap__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.5;
  color: var(--ink-navy);
  margin: 0 0 10px;
}

.page-about .cap__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  max-width: 68ch;
}

.page-about .cap-foot {
  margin: 36px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}

.page-about .cap-foot__link {
  font-size: 15px;
  color: var(--navy-link);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .cap-foot__link:hover,
.page-about .cap-foot__link:focus-visible {
  color: var(--ink-navy);
}

/* 时间轴 */
.page-about .tl {
  margin-top: 44px;
}

.page-about .tl__row {
  position: relative;
  padding: 30px 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .tl__year {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.1;
  color: var(--ink-navy);
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .tl__dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 3px solid var(--sand-gold);
  background: var(--paper);
  flex: none;
}

.page-about .tl__fold {
  border: 0;
  background: transparent;
}

.page-about .tl__fold .fold__summary {
  cursor: pointer;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink-navy);
  padding: 6px 0;
}

.page-about .tl__fold .fold__summary:focus-visible {
  outline: 2px solid var(--sand-gold);
  outline-offset: 2px;
}

.page-about .tl__events {
  list-style: none;
  margin: 14px 0 0;
  padding: 0 0 0 16px;
  border-left: 3px solid var(--sand-light);
}

.page-about .tl__events li {
  position: relative;
  padding: 8px 0 8px 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-ink);
}

.page-about .tl__events li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 20px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal-cyan);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .team-grid__lede {
  margin: 18px 0 0;
  font-size: var(--fs-body);
  line-height: 1.9;
  max-width: 60ch;
}

.page-about .team-roles {
  margin: 32px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .team-role {
  padding: 20px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .team-role dt {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--ink-navy);
  margin-bottom: 8px;
}

.page-about .team-role dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-ink);
}

/* 资质 */
.page-about .cert-list {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
}

.page-about .cert {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  transition: background-color 0.24s var(--ease);
}

.page-about .cert:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-about .cert:hover,
.page-about .cert:focus-within {
  background-color: var(--paper-alt);
}

.page-about .cert:focus-visible {
  outline: 2px solid var(--sand-gold);
  outline-offset: 2px;
}

.page-about .cert__no {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.2;
  color: var(--ink-navy);
  font-variant-numeric: tabular-nums;
}

.page-about .cert__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink-navy);
  margin: 0;
}

.page-about .cert__note {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
  transition: max-height 0.26s var(--ease), opacity 0.26s var(--ease), margin-top 0.26s var(--ease);
}

.page-about .cert:hover .cert__note,
.page-about .cert:focus-within .cert__note {
  max-height: 140px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .honor {
  margin-top: 36px;
  padding: 24px 26px;
  background: var(--sand-light);
  border-left: 3px solid var(--ink-navy);
  border-radius: 0 var(--radius-soft) var(--radius-soft) 0;
}

.page-about .honor__line {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-ink);
}

.page-about .honor__line + .honor__line {
  margin-top: 8px;
}

.page-about .honor__year {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink-navy);
  margin-right: 12px;
  font-variant-numeric: tabular-nums;
}

/* 收尾 */
.page-about .about-cta {
  background: var(--navy-deep);
  color: var(--paper);
  margin-top: clamp(64px, 8vw, 120px);
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-cta__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.4;
  color: var(--paper);
  margin: 0;
}

.page-about .about-cta__lede {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(250, 247, 240, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-cta__link {
  display: inline-block;
  padding: 12px 24px;
  border: 1px solid rgba(250, 247, 240, 0.5);
  border-radius: 999px;
  font-size: 15px;
  color: var(--paper);
  text-decoration: none;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-cta__link--solid {
  background: var(--sand-gold);
  border-color: var(--sand-gold);
  color: var(--navy-deep);
  font-weight: 600;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  transform: translateY(-2px);
}

.page-about .about-cta__link:not(.about-cta__link--solid):hover,
.page-about .about-cta__link:not(.about-cta__link--solid):focus-visible {
  background: rgba(250, 247, 240, 0.14);
}

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

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

  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .cap {
    grid-template-columns: 72px 1fr;
    gap: 24px;
  }
}

@media (min-width: 860px) {
  .page-about .tl__row {
    grid-template-columns: var(--about-year-w) 1fr;
    gap: var(--about-gap);
    padding: 34px 0;
  }

  .page-about .tl__year {
    align-items: flex-start;
    padding-top: 6px;
  }

  .page-about .tl__row::after {
    content: "";
    position: absolute;
    left: calc(var(--about-year-w) + var(--about-gap) / 2);
    top: 0;
    bottom: 0;
    border-left: 1px dashed var(--line);
    opacity: 0.75;
  }

  .page-about .tl__year,
  .page-about .tl__fold {
    position: relative;
    z-index: 1;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cap,
  .page-about .cert,
  .page-about .cert__note,
  .page-about .about-cta__link {
    transition: none;
  }

  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible {
    transform: none;
  }
}