.page-about {
  --about-accent-soft: rgba(255, 107, 26, 0.16);
  --about-panel: #12161F;
  --about-hair: rgba(42, 47, 58, 0.9);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 26px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .breadcrumb a,
.page-about .breadcrumb .link {
  color: var(--mist);
  text-decoration: none;
}

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

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--paper);
}

/* 区块骨架 */
.page-about .about-section {
  position: relative;
  padding-block: 56px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-opening {
  position: relative;
  border-top: 0;
  padding-block: 34px 56px;
}

.page-about .about-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 34px;
}

.page-about .section-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 44px);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: rgba(255, 107, 26, 0.5);
  line-height: 1;
}

.page-about .section__title {
  margin: 0;
  font-size: clamp(25px, 4.4vw, 42px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .section__lead {
  margin: 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--mist);
}

/* 竖排展览式注释 */
.page-about .about-rail {
  display: none;
  position: absolute;
  top: 96px;
  left: 10px;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
}

/* 首屏 */
.page-about .about-opening__grid {
  display: grid;
  gap: 34px;
  align-items: center;
}

.page-about .about-h1 {
  margin: 14px 0 20px;
  font-size: clamp(32px, 7.6vw, 66px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-h1 span {
  display: block;
  color: var(--orange);
}

.page-about .about-opening__note {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-opening__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-opening__figure {
  position: relative;
  margin: 0;
}

.page-about .about-opening__figure::before {
  content: "";
  position: absolute;
  left: -10px;
  bottom: -12px;
  width: 46%;
  height: 32%;
  background: linear-gradient(140deg, var(--orange), var(--red) 72%);
  clip-path: polygon(0 14%, 100% 0, 100% 100%, 0 100%);
  opacity: 0.9;
  z-index: -1;
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.95);
}

/* 章节索引 */
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-index__link:hover {
  color: var(--orange);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

/* 02 服务 */
.page-about .about-services {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-service {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--about-panel);
  border: 1px solid var(--about-hair);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-service::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-service:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-service__title {
  margin: 14px 0 10px;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-service__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* 03 时间线 */
.page-about .about-timeline__figure {
  margin: 0 0 44px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--red) 48%, rgba(200, 30, 30, 0) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 24px 34px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--orange);
}

.page-about .about-year {
  background: var(--about-panel);
  border: 1px solid var(--about-hair);
  transition: border-color 0.2s ease;
}

.page-about .about-year[open] {
  border-color: rgba(255, 107, 26, 0.6);
}

.page-about .about-year:hover {
  border-color: var(--orange);
}

.page-about .about-year__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-year__y {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .about-year__t {
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-year__sign {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--mist);
}

.page-about .about-year__sign::after {
  content: "+";
}

.page-about .about-year[open] .about-year__sign::after {
  content: "–";
}

.page-about .about-year__body {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* 04 团队 */
.page-about .about-team {
  display: grid;
  gap: 18px;
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--about-panel);
  border: 1px solid var(--about-hair);
  box-shadow: inset 0 1px 0 rgba(245, 241, 234, 0.05), 0 12px 28px rgba(0, 0, 0, 0.32);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-team__card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-team__count {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-team__num {
  font-size: 32px;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__title {
  margin: 12px 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 34px 0 0;
}

/* 05 覆盖 */
.page-about .about-coverage {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .about-coverage__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-stats {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink-2);
  margin: 0;
}

.page-about .about-stat .stat__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-stat .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
  margin: 0;
}

.page-about .about-stat .stat__value--orange {
  color: var(--orange);
}

.page-about .about-stat .stat__value--cyan {
  color: var(--cyan);
}

.page-about .about-stat__unit {
  font-size: 0.5em;
  color: var(--mist);
  margin-left: 2px;
}

/* 06 更新与导航 */
.page-about .about-cadence {
  display: grid;
  gap: 34px;
}

.page-about .about-sub {
  margin: 0 0 16px;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-sub::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--orange);
}

.page-about .about-ticks {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-ticks li {
  padding: 14px 0;
  border-bottom: 1px solid var(--about-hair);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-ticks__k {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  margin-bottom: 4px;
}

.page-about .about-cadence__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-navlinks {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-navlinks li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-navlinks span {
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: 44px;
  padding: 26px 22px;
  background: var(--ink-2);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--orange);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--paper);
}

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

@media (min-width: 640px) {
  .page-about .about-services {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-section {
    padding-block: 96px;
  }

  .page-about .about-opening {
    padding-block: 44px 96px;
  }

  .page-about .about-opening__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    gap: 56px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-cadence {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-timeline::before {
    left: 50%;
  }

  .page-about .about-timeline__item {
    width: 50%;
    padding: 0 46px 30px 0;
  }

  .page-about .about-timeline__item::before {
    left: auto;
    right: -5px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 30px 46px;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: -5px;
    right: auto;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-services {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1420px) {
  .page-about .about-rail {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-service,
  .page-about .about-team__card,
  .page-about .about-index__link,
  .page-about .about-year {
    transition: none;
  }

  .page-about .about-service:hover,
  .page-about .about-team__card:hover {
    transform: none;
  }
}