.page-about {
  display: block;
  background: var(--ink-900);
  color: var(--body-ink);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-crumb {
  padding-top: 1.25rem;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 0.25rem 0 2.75rem;
  background:
    radial-gradient(115% 85% at 84% 6%, rgba(198, 255, 61, 0.13), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-green) 30%, var(--line-green) 70%, transparent);
  transform: rotate(-1.1deg);
  transform-origin: left center;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  padding-top: 1.5rem;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0.6rem 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(2.05rem, 8.4vw, 3.9rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--chalk);
}

.page-about .about-hero__title .hl {
  color: var(--chalk);
  background-image: linear-gradient(
    transparent 64%,
    rgba(198, 255, 61, 0.45) 64%,
    rgba(198, 255, 61, 0.45) 94%,
    transparent 94%
  );
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 1.15rem 0 0;
  color: var(--chalk-dim);
  font-size: 1.02rem;
  line-height: 1.85;
}

.page-about .about-hero__cta {
  margin-top: 1.6rem;
}

.page-about .about-hero__board {
  position: relative;
  padding: 1.35rem 1.15rem 1.5rem;
  background: linear-gradient(155deg, rgba(18, 58, 44, 0.95), rgba(11, 42, 32, 0.9));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-hero__boardTag {
  margin: 0 0 1rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-left: 0.7rem;
  border-left: 2px solid var(--line-green);
}

.page-about .about-hero__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.55rem;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-hero__lab {
  font-size: 0.78rem;
  color: var(--chalk-dim);
  line-height: 1.4;
}

/* ---------- 目录骨架 ---------- */

.page-about .about-sheet {
  display: grid;
  gap: 1.25rem;
  padding-top: 2.25rem;
  padding-bottom: 3.25rem;
}

.page-about .about-index__cap {
  margin: 0 0 0.6rem;
  font-family: var(--serif);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.6rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  border-left: 2px solid transparent;
  background: rgba(18, 58, 44, 0.6);
  color: var(--chalk-dim);
  font-size: 0.85rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-left-color: var(--signal);
  background: rgba(198, 255, 61, 0.1);
  color: var(--chalk);
}

.page-about .about-index__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.76rem;
  color: var(--signal);
}

/* ---------- 章节通用 ---------- */

.page-about .about-sec {
  padding-block: 2.25rem;
  border-top: 1px solid rgba(28, 81, 64, 0.75);
  scroll-margin-top: 7rem;
}

.page-about .about-body > .about-sec:first-of-type {
  border-top: 0;
  padding-top: 0.35rem;
}

.page-about .about-sec__num {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.45rem, 5.2vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
  color: var(--chalk);
}

.page-about .about-sec__title::after {
  content: "";
  display: block;
  width: 52px;
  height: 2px;
  margin-top: 0.8rem;
  background: var(--signal);
  transform: rotate(-2deg);
  transform-origin: left center;
}

.page-about .about-sec__intro {
  max-width: 42em;
  margin: 1rem 0 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--body-ink);
}

.page-about .about-body a {
  color: var(--glow);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.4);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-body a:hover,
.page-about .about-body a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 01 概览 ---------- */

.page-about .about-brief__cards {
  display: grid;
  gap: 0.8rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-brief__card {
  padding: 1rem 1rem 1.1rem;
  background: var(--charcoal);
  border-top: 2px solid var(--line-green);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-brief__card:hover {
  border-top-color: var(--signal);
  transform: translateY(-2px);
}

.page-about .about-brief__card p {
  margin: 0.6rem 0 0;
  font-size: 0.89rem;
  line-height: 1.72;
  color: var(--chalk-dim);
}

/* ---------- 02 栏目地图 ---------- */

.page-about .about-catalog__list {
  display: grid;
  gap: 0.9rem;
  margin: 1.65rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-catalog__item {
  display: grid;
  gap: 0.6rem;
  padding: 1.15rem 1.15rem 1.25rem 1.3rem;
  background: linear-gradient(155deg, var(--ink-700), var(--ink-800));
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: background 0.2s ease;
}

.page-about .about-catalog__item:nth-child(even) {
  clip-path: polygon(18px 0, 100% 0, 100% 100%, 0 100%, 0 18px);
}

.page-about .about-catalog__item:hover {
  background: linear-gradient(155deg, #17493A, var(--ink-700));
}

.page-about .about-catalog__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .about-catalog__name {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--chalk);
}

.page-about .about-catalog__body p {
  max-width: 46em;
  margin: 0.5rem 0 0;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--chalk-dim);
}

.page-about .about-catalog__more {
  margin: 1.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--chalk-dim);
}

/* ---------- 03 单队社区 ---------- */

.page-about .about-club__grid {
  display: grid;
  gap: 1.35rem;
  margin-top: 1.5rem;
}

.page-about .about-club__topics {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-club__topic {
  padding: 1.05rem 1.05rem 1.15rem;
  background: rgba(18, 58, 44, 0.5);
  border-left: 2px solid var(--signal);
}

.page-about .about-club__topic h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1rem;
  color: var(--chalk);
}

.page-about .about-club__topic p {
  margin: 0.5rem 0 0;
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--chalk-dim);
}

.page-about .about-club__join {
  padding: 1.2rem 1.2rem 1.3rem;
  background: var(--charcoal);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-club__joinTitle {
  margin: 0 0 0.85rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-club__steps {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-club__steps li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  font-size: 0.89rem;
  line-height: 1.68;
  color: var(--body-ink);
}

.page-about .about-club__steps .num {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.84rem;
  color: var(--signal);
}

.page-about .about-club__note {
  margin: 0.9rem 0 0;
  font-size: 0.83rem;
  line-height: 1.7;
  color: var(--chalk-dim);
}

.page-about .about-club__figure {
  margin: 1.6rem 0 0;
}

/* ---------- 04 时间线 ---------- */

.page-about .about-line__grid {
  display: grid;
  gap: 1.6rem;
  margin-top: 1.6rem;
}

.page-about .about-line__figure {
  margin: 0;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.6rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-green), rgba(28, 81, 64, 0.15));
}

.page-about .about-timeline__node {
  position: relative;
  padding-bottom: 1.7rem;
  transition: transform 0.18s ease;
}

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

.page-about .about-timeline__mark {
  position: absolute;
  left: -1.6rem;
  top: 0.3rem;
  width: 11px;
  height: 11px;
  background: var(--ink-900);
  border: 2px solid var(--signal);
  transform: rotate(45deg);
  transition: background-color 0.18s ease;
}

.page-about .about-timeline__node:hover .about-timeline__mark,
.page-about .about-timeline__node:focus-within .about-timeline__mark {
  background: var(--signal);
}

.page-about .about-timeline__ver {
  margin: 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-timeline__name {
  margin: 0.28rem 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: 1.08rem;
  letter-spacing: -0.015em;
  color: var(--chalk);
}

.page-about .about-timeline__desc {
  max-width: 38em;
  margin: 0.42rem 0 0;
  font-size: 0.91rem;
  line-height: 1.78;
  color: var(--chalk-dim);
}

/* ---------- 05 团队 ---------- */

.page-about .about-team__list {
  display: grid;
  gap: 0.7rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__row {
  display: grid;
  gap: 0.3rem 1rem;
  padding: 1rem 1.1rem;
  background: rgba(15, 35, 29, 0.85);
  border-left: 2px solid var(--line-green);
  transition: border-color 0.18s ease, background-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  border-left-color: var(--signal);
  background: rgba(18, 58, 44, 0.92);
  transform: translateX(2px);
}

.page-about .about-team__role {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--chalk);
}

.page-about .about-team__count {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.84rem;
  color: var(--signal);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--chalk-dim);
}

.page-about .about-team__note {
  margin: 1.4rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--chalk-dim);
}

/* ---------- 06 服务 ---------- */

.page-about .about-serve__figure {
  margin: 1.5rem 0 0;
}

.page-about .about-serve__grid {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.page-about .about-serve__card {
  padding: 1rem 1.1rem 1.1rem;
  background: var(--ink-700);
  border-top: 2px solid var(--line-green);
}

.page-about .about-serve__label {
  margin: 0;
  font-size: 0.73rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-serve__value {
  margin: 0.42rem 0 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--chalk);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-about .about-serve__value.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.94rem;
}

.page-about .about-serve__note {
  margin-top: 1.4rem;
  padding: 1.15rem 1.15rem 1.15rem 1.35rem;
  background: rgba(18, 58, 44, 0.42);
  border-left: 2px solid var(--signal);
}

.page-about .about-serve__note p {
  max-width: 46em;
  margin: 0 0 0.7rem;
  font-size: 0.91rem;
  line-height: 1.8;
  color: var(--body-ink);
}

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

.page-about .about-serve__more {
  margin: 1.4rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--chalk-dim);
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame__media {
  overflow: hidden;
  background: var(--ink-700);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

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

.page-about .media-frame__cap {
  margin-top: 0.7rem;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--chalk-dim);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-brief__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-club__topics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-team__row {
    grid-template-columns: 8.5rem 4.5rem minmax(0, 1fr);
    align-items: center;
  }

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

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

  .page-about .about-catalog__item {
    grid-template-columns: 3rem minmax(0, 1fr) auto;
    align-items: start;
    gap: 0.5rem 1rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-bottom: 3.5rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.86fr);
    align-items: end;
    gap: 3rem;
    padding-top: 2.5rem;
  }

  .page-about .about-club__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    gap: 1.6rem;
  }

  .page-about .about-line__grid {
    grid-template-columns: minmax(0, 0.6fr) minmax(0, 1fr);
    gap: 2.4rem;
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-sheet {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 3rem;
    padding-top: 3.25rem;
    padding-bottom: 4rem;
  }

  .page-about .about-index {
    position: sticky;
    top: 7rem;
    align-self: start;
    padding-right: 0.75rem;
    border-right: 1px solid rgba(28, 81, 64, 0.6);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.12rem;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-index__link {
    justify-content: flex-start;
    padding: 0.55rem 0.75rem;
    background: none;
    border-left: 2px solid rgba(28, 81, 64, 0.55);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: rgba(198, 255, 61, 0.07);
  }

  .page-about .about-sec {
    padding-block: 2.75rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}