.page-about {
  --about-deep: #050F1E;
  --about-rule: rgba(138, 155, 176, .22);
  --about-body: rgba(242, 246, 250, .86);
  background: var(--about-deep);
  color: var(--paper);
  overflow-x: hidden;
  padding-bottom: 0;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(24px, 6vw, 52px) 0 clamp(40px, 8vw, 76px);
  border-bottom: 1px solid var(--about-rule);
  background:
    radial-gradient(120% 80% at 82% 0%, rgba(0, 229, 255, .10) 0%, rgba(0, 229, 255, 0) 58%),
    var(--about-deep);
}

.page-about .crumb-line {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
  margin-bottom: clamp(22px, 5vw, 40px);
}

.page-about .crumb-line a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .crumb-line a:hover,
.page-about .crumb-line a:focus-visible {
  color: var(--cy);
  border-bottom-color: var(--cy);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .hero-title {
  margin: 0;
  font-size: clamp(38px, 11vw, 66px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paper);
  transform: skewX(-4deg);
  transform-origin: left bottom;
  text-wrap: balance;
}

.page-about .hero-side {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--cy);
  writing-mode: vertical-rl;
  justify-self: end;
  align-self: start;
  padding-top: 4px;
}

.page-about .hero-lede {
  margin: clamp(20px, 4vw, 30px) 0 0;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: clamp(22px, 4vw, 32px);
  padding-top: 18px;
  border-top: 1px solid var(--about-rule);
  font-size: 13px;
  color: var(--mist);
}

.page-about .hero-facts__item {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
}

.page-about .hero-facts__item .data-num {
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 700;
  color: var(--cy);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-media {
  position: relative;
  margin-top: clamp(26px, 5vw, 44px);
  aspect-ratio: 2 / 1;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  clip-path: polygon(0 0, 100% 0, 100% 86%, 94% 100%, 0 100%);
}

.page-about .hero-media img {
  width: 100%;
  height: 100%;
  filter: saturate(.9) contrast(1.05);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-top: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-index::-webkit-scrollbar {
  display: none;
}

.page-about .about-index .chapter-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 14px;
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--about-rule);
  white-space: nowrap;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .about-index .chapter-index__link .data-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cy);
}

.page-about .about-index .chapter-index__link:hover,
.page-about .about-index .chapter-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--cy);
  background: rgba(0, 229, 255, .07);
}

.page-about .about-index .chapter-index__link[data-current] {
  color: var(--paper);
  border-color: var(--cy);
  background: rgba(0, 229, 255, .12);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding: clamp(44px, 9vw, 88px) 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-chapter__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-data);
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cy);
  line-height: 1;
}

.page-about .about-chapter__label {
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--mist);
}

.page-about .about-chapter__title {
  margin: 0 0 20px;
  font-size: clamp(24px, 6vw, 38px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-chapter__intro {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-chapter__body p {
  margin: 0 0 1.15em;
  max-width: 36em;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--about-body);
}

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

.page-about .about-foot {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 22px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
  cursor: help;
}

.page-about .about-foot .data-num {
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cy);
}

/* ---------- 02 覆盖与节奏 ---------- */

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 5vw, 36px);
}

.page-about .coverage-media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 8% 100%, 0 88%);
  align-self: start;
}

.page-about .coverage-media img {
  width: 100%;
  height: 100%;
  filter: saturate(.85);
}

/* ---------- 03 版本长廊 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-timeline__item {
  position: relative;
  border-left: 1px solid var(--about-rule);
  padding-left: 18px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 22px;
  width: 3px;
  height: 14px;
  background: var(--cy);
  opacity: .8;
}

.page-about .about-fold {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-fold__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  transition: color .16s var(--ease);
}

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

.page-about .about-fold__summary:hover,
.page-about .about-fold__summary:focus-visible {
  color: var(--cy);
}

.page-about .about-fold__tag {
  font-family: var(--font-data);
  font-size: 19px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cy);
  line-height: 1;
}

.page-about .about-fold__name {
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-fold[open] .about-fold__name {
  color: var(--cy);
}

.page-about .about-fold__body {
  padding: 0 0 20px 31px;
}

.page-about .about-fold__body p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-body);
}

/* ---------- 04 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 5vw, 36px);
}

.page-about .team-media {
  aspect-ratio: 11 / 7.4;
  overflow: hidden;
  border: 1px solid var(--about-rule);
  clip-path: polygon(6% 0, 100% 0, 100% 100%, 0 100%, 0 12%);
  align-self: start;
}

.page-about .team-media img {
  width: 100%;
  height: 100%;
  filter: saturate(.9);
}

/* ---------- 05 内容标准 ---------- */

.page-about .standard-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .standard-item {
  padding: 20px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .standard-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .standard-item__num {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: .1em;
  color: var(--flame);
  margin-bottom: 8px;
}

.page-about .standard-item__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .standard-item p {
  margin: 0;
  max-width: 32em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 尾部入口 ---------- */

.page-about .about-next {
  padding: clamp(40px, 8vw, 72px) 0 clamp(56px, 10vw, 96px);
  background:
    radial-gradient(90% 120% at 8% 100%, rgba(255, 92, 26, .12) 0%, rgba(255, 92, 26, 0) 62%),
    var(--ink-900);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-next__lead {
  margin: 0;
  font-size: clamp(20px, 5vw, 28px);
  font-weight: 900;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-next__links li {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-next__links a {
  display: block;
  padding: 15px 0;
  font-size: 15.5px;
  color: var(--paper);
  text-decoration: none;
  transition: color .16s var(--ease), padding-left .16s var(--ease);
}

.page-about .about-next__links a::before {
  content: "→";
  display: inline-block;
  margin-right: 10px;
  color: var(--cy);
  font-family: var(--font-data);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  color: var(--cy);
  padding-left: 6px;
}

/* ---------- 桌面端 ---------- */

@media (min-width: 768px) {
  .page-about .about-chapter {
    padding: clamp(56px, 7vw, 92px) 0;
  }

  .page-about .hero-lede {
    font-size: 17.5px;
  }

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

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

  .page-about .standard-item {
    border-top: 1px solid var(--about-rule);
    padding: 22px 0;
  }

  .page-about .standard-item:nth-child(-n+2) {
    border-top: 0;
    padding-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: 108px;
  }

  .page-about .about-chapter__label {
    writing-mode: vertical-rl;
    letter-spacing: .3em;
    font-size: 11.5px;
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .coverage-media {
    margin-top: 6px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .team-media {
    margin-top: 6px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
    margin-top: 6px;
  }

  .page-about .about-timeline__item {
    border-left: 1px solid var(--about-rule);
    padding-left: 18px;
  }

  .page-about .about-timeline__item:first-child {
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-fold__summary {
    display: block;
    padding: 16px 0 12px;
  }

  .page-about .about-fold__tag {
    display: block;
    margin-bottom: 10px;
  }

  .page-about .about-fold__name {
    display: block;
    font-size: 15.5px;
    line-height: 1.55;
  }

  .page-about .about-fold__body {
    padding: 0 0 20px 0;
  }

  .page-about .about-fold__body p {
    font-size: 14.5px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}