.page-about {
  --about-rail: 152px;
  --about-rule: 1px solid var(--line);
  --about-card: rgba(23, 74, 57, .55);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: clamp(16px, 3vw, 26px) 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

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

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  text-decoration: underline;
}

.page-about .breadcrumb__sep {
  color: var(--ink-3);
}

/* ---------- 封面 ---------- */

.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px) 0 clamp(44px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(61, 245, 208, .14), transparent 62%),
    radial-gradient(90% 70% at -5% 100%, rgba(255, 177, 59, .1), transparent 66%);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.page-about .about-cover__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-cover__main {
  order: 1;
  min-width: 0;
}

.page-about .about-cover__rail {
  order: 2;
  min-width: 0;
}

.page-about .about-cover__main h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--chalk);
}

.page-about .about-cover__main .lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-cover__figure {
  margin: clamp(28px, 4vw, 40px) 0 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
}

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

.page-about .media-frame__caption {
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 年份索引 ---------- */

.page-about .yearrail {
  display: flex;
  gap: 10px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .yearrail__item {
  flex: 0 0 auto;
}

.page-about .yearrail__link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 116px;
  padding: 10px 12px;
  background: var(--ink-2);
  border-left: 2px solid var(--amber);
  text-decoration: none;
  scroll-snap-align: start;
  transition: background .22s var(--ease), transform .22s var(--ease);
}

.page-about .yearrail__link:hover,
.page-about .yearrail__link:focus-visible {
  background: var(--ink-3);
}

.page-about .yearrail__year {
  font-size: 15px;
  color: var(--amber);
  letter-spacing: .06em;
}

.page-about .yearrail__text {
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: clamp(46px, 7vw, 92px) 0;
}

.page-about .about-chapter__head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-chapter__num {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .22em;
  color: var(--amber);
}

.page-about .about-chapter__head h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.6vw, 36px);
  line-height: 1.18;
  letter-spacing: -.005em;
  color: var(--chalk);
}

.page-about .about-chapter__lead {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
}

.page-about .about-split__main {
  min-width: 0;
}

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

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-split__aside {
  min-width: 0;
  padding: 20px 0 0;
  border-top: 2px solid var(--line-strong);
}

.page-about .about-split__asideTitle {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--mint);
}

.page-about .about-split__figure {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%);
}

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

/* ---------- 时间线 ---------- */

.page-about .timeline {
  margin: 0;
  padding: 0 0 0 18px;
  list-style: none;
  position: relative;
  border-left: 1px solid var(--line-strong);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 20px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .timeline__year {
  display: block;
  font-size: 16px;
  color: var(--cyan);
  letter-spacing: .08em;
}

.page-about .timeline__text {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 数字小卡 ---------- */

.page-about .aside-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 22px;
}

.page-about .stat {
  padding: 14px 16px;
  background: linear-gradient(135deg, rgba(23, 74, 57, .92), rgba(14, 46, 36, .92));
  border-left: 2px solid var(--mint);
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .stat:hover {
  border-left-color: var(--amber);
}

.page-about .stat__num {
  display: block;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .stat__label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 场景清单 ---------- */

.page-about .scene {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .scene__item {
  position: relative;
  padding-left: 58px;
}

.page-about .scene__idx {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  font-size: 13px;
  color: var(--amber);
  border: 1px solid var(--line-strong);
}

.page-about .scene__title {
  margin: 4px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--chalk);
}

.page-about .scene__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 靛紫色带 ---------- */

.page-about .about-band--indigo {
  background: linear-gradient(180deg, rgba(33, 26, 58, .98), var(--indigo));
}

.page-about .about-band--indigo::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--cyan) 0 14px, transparent 14px 30px);
  opacity: .55;
}

.page-about .about-band--indigo .about-split__aside {
  border-top-color: var(--cyan);
}

.page-about .metricrow {
  display: grid;
  gap: 12px;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.page-about .metricrow__item {
  padding: 16px 18px;
  background: rgba(7, 26, 20, .5);
  border-bottom: 2px solid var(--amber);
}

.page-about .metricrow__num {
  display: block;
  font-size: 30px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .metricrow__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 酒红色带 ---------- */

.page-about .about-band--wine {
  background: linear-gradient(180deg, rgba(74, 30, 43, .96), #361520);
}

.page-about .about-band--wine::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--amber), var(--amber-deep));
  opacity: .8;
}

.page-about .about-band--wine .about-split__asideTitle {
  color: var(--amber);
}

.page-about .teamstats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .teamstats__item {
  padding: 16px 16px 18px;
  background: rgba(7, 26, 20, .45);
}

.page-about .teamstats__num {
  display: block;
  font-size: 28px;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .teamstats__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 服务原则 ---------- */

.page-about .principles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .principles__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding-top: 18px;
  border-top: var(--about-rule);
}

.page-about .principles__item:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .principles__num {
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: .1em;
  padding-top: 4px;
}

.page-about .principles__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--chalk);
}

.page-about .principles__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 联系旁注 ---------- */

.page-about .about-split__aside--service {
  background: linear-gradient(180deg, rgba(14, 46, 36, .96), rgba(7, 26, 20, .96));
  padding: 22px 20px 24px;
  border-top: none;
  border-left: 2px solid var(--amber);
}

.page-about .about-split__aside--service .about-split__asideTitle {
  color: var(--amber);
  margin-bottom: 14px;
}

.page-about .contactline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .contactline__item {
  display: grid;
  gap: 3px;
}

.page-about .contactline__label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .contactline__value {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--chalk);
  word-break: break-word;
}

.page-about .about-split__asideBtn {
  margin-top: 20px;
  width: 100%;
}

/* ---------- 页尾入口 ---------- */

.page-about .about-next {
  margin-top: clamp(38px, 6vw, 64px);
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-next__lead {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
}

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

.page-about .about-next__link {
  display: block;
  padding: 12px 0 12px 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--chalk);
  text-decoration: none;
  border-left: 2px solid var(--line-strong);
  transition: border-color .22s var(--ease), color .22s var(--ease), padding-left .22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  padding-left: 28px;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 700px) {
  .page-about .teamstats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cover__actions {
    margin-top: 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cover__rail {
    order: 1;
    padding-top: 4px;
    position: sticky;
    top: 96px;
  }

  .page-about .about-cover__main {
    order: 2;
  }

  .page-about .yearrail {
    display: block;
    overflow: visible;
    padding-left: 20px;
    position: relative;
  }

  .page-about .yearrail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan), var(--line));
  }

  .page-about .yearrail__item + .yearrail__item {
    margin-top: 20px;
  }

  .page-about .yearrail__link {
    min-width: 0;
    padding: 0 0 0 2px;
    background: none;
    border-left: none;
  }

  .page-about .yearrail__link:hover,
  .page-about .yearrail__link:focus-visible {
    background: none;
    transform: translateX(4px);
  }

  .page-about .yearrail__link:hover .yearrail__year,
  .page-about .yearrail__link:focus-visible .yearrail__year {
    color: var(--cyan);
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

  .page-about .about-split--reverse .about-split__figure {
    order: 1;
  }

  .page-about .about-split--reverse .about-split__main {
    order: 2;
  }

  .page-about .about-split__aside {
    padding-top: 22px;
  }

  .page-about .contactline__value {
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .yearrail__link,
  .page-about .stat,
  .page-about .about-next__link {
    transition: none;
  }

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