.page-about {
  --about-card: rgba(30, 41, 59, .74);
  --about-card-line: rgba(148, 163, 184, .26);
  display: block;
  background: var(--night);
  color: var(--body-text);
  font-family: var(--font-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.page-about .wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: clamp(16px, 4vw, 40px);
  padding-right: clamp(16px, 4vw, 40px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 42px) 0 clamp(36px, 7vw, 88px);
  background:
    radial-gradient(130% 96% at 86% 0%, rgba(25, 227, 209, .16), transparent 60%),
    linear-gradient(174deg, var(--turf) 0%, #06231F 44%, var(--night) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(148, 163, 184, .08) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(148, 163, 184, .08) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 22%, var(--signal) 52%, var(--gold) 78%, transparent);
  opacity: .6;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .25rem;
  margin: 0 0 clamp(16px, 3vw, 30px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--neutral);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: .35rem;
  color: var(--line-strong);
}

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

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

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  max-width: 48ch;
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--body-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--about-card-line);
  border: 1px solid var(--about-card-line);
}

.page-about .about-fact {
  background: rgba(7, 26, 43, .82);
  padding: clamp(14px, 2.4vw, 22px);
}

.page-about .about-fact dt {
  margin: 0 0 .4rem;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--neutral);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--signal);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: .375rem;
  margin-top: clamp(28px, 5vw, 48px);
  padding-top: clamp(16px, 2.6vw, 24px);
  border-top: 1px solid var(--line);
}

.page-about .about-jump a {
  display: inline-block;
  padding: .3rem .7rem;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--neutral);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--cyan);
  border-color: var(--line-strong);
  background: rgba(25, 227, 209, .07);
}

/* ---------- 编号章节 ---------- */

.page-about .about-chapter {
  position: relative;
  padding: clamp(44px, 9vw, 104px) 0;
  background: var(--night);
}

.page-about .about-chapter--alt {
  background: linear-gradient(180deg, #0A2233 0%, #061826 100%);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 3.5vw, 36px);
}

.page-about .about-chapter__index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 9vw, 5.25rem);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.05em;
  color: transparent;
  -webkit-text-stroke: 1px var(--signal);
}

@supports not (-webkit-text-stroke: 1px red) {
  .page-about .about-chapter__index {
    color: var(--signal);
  }
}

.page-about .about-chapter__kicker {
  margin: .7rem 0 0;
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-chapter__title {
  margin: 0 0 clamp(14px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.7vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-chapter__body > p {
  max-width: 64ch;
  margin: 0 0 1.05em;
  font-size: clamp(1rem, 1.35vw, 1.0625rem);
  line-height: 1.88;
  color: var(--body-text);
}

.page-about .about-chapter__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

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

.page-about .aside-note {
  display: inline-block;
  max-width: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: .55rem .9rem;
  border-left: 2px solid var(--gold);
  background: rgba(242, 193, 78, .08);
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--gold);
}

/* ---------- 团队角色 ---------- */

.page-about .tabs {
  margin-top: clamp(20px, 3.4vw, 32px);
}

.page-about .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: clamp(16px, 2.8vw, 24px);
}

.page-about .tab {
  padding: .55rem 1rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--neutral);
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color .2s ease, background-color .2s ease, border-color .2s ease;
}

.page-about .tab:hover,
.page-about .tab:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
}

.page-about .tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
  font-weight: 700;
}

.page-about .tab-panel {
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--about-card-line);
  border-left: 3px solid var(--signal);
  background: var(--about-card);
}

.page-about .tab-panel h3 {
  margin: 0 0 .7rem;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: 800;
  color: var(--mist);
}

.page-about .tab-panel p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .about-role-list {
  display: grid;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--neutral);
}

.page-about .about-role-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 六步流程 ---------- */

.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--about-card-line);
  border: 1px solid var(--about-card-line);
}

.page-about .about-steps__item {
  background: var(--about-card);
  padding: clamp(18px, 3vw, 26px);
  transition: background-color .22s ease, box-shadow .22s ease;
}

.page-about .about-steps__item:hover {
  background: rgba(11, 61, 46, .62);
  box-shadow: inset 0 0 0 1px rgba(25, 227, 209, .38);
}

.page-about .about-steps__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--signal);
  margin-bottom: .6rem;
}

.page-about .about-steps__name {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--body-text);
}

/* ---------- 覆盖规模 ---------- */

.page-about .about-figures {
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(22px, 3.6vw, 34px);
  padding: 1px;
  list-style: none;
  background: var(--about-card-line);
  border: 1px solid var(--about-card-line);
}

.page-about .about-figures__item {
  background: rgba(7, 26, 43, .8);
  padding: clamp(16px, 2.6vw, 24px);
}

.page-about .about-figures__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--signal);
}

.page-about .about-figures__label {
  margin: .5rem 0 0;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--neutral);
}

.page-about .about-leagues {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0 0 clamp(20px, 3.2vw, 30px);
  padding: 0;
  list-style: none;
}

.page-about .about-leagues li {
  padding: .35rem .75rem;
  border: 1px solid rgba(91, 75, 255, .55);
  background: rgba(91, 75, 255, .14);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .04em;
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 1px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-card-line);
  border: 1px solid var(--about-card-line);
}

.page-about .about-timeline__item {
  position: relative;
  background: linear-gradient(180deg, rgba(11, 61, 46, .7) 0%, rgba(7, 26, 43, .96) 100%);
  padding: clamp(20px, 3vw, 28px) clamp(16px, 2.4vw, 22px) clamp(22px, 3.4vw, 32px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--signal);
  opacity: .55;
  transition: opacity .2s ease, background-color .2s ease;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--cyan);
  opacity: 1;
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .about-timeline__title {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--neutral);
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3.4vw, 32px) 0 0;
  padding: 1px;
  background: var(--about-card-line);
  border: 1px solid var(--about-card-line);
}

.page-about .about-eco__card {
  background: var(--about-card);
  padding: clamp(18px, 2.8vw, 26px);
  transition: background-color .22s ease, box-shadow .22s ease;
}

.page-about .about-eco__card:hover {
  background: rgba(91, 75, 255, .14);
  box-shadow: inset 0 0 0 1px rgba(25, 227, 209, .34);
}

.page-about .about-eco__card h3 {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--mist);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--body-text);
}

.page-about .about-awards {
  display: grid;
  gap: .75rem;
  margin: clamp(20px, 3.2vw, 30px) 0 0;
}

.page-about .about-awards__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  margin: 0;
  padding: .85rem 1rem;
  border-left: 2px solid var(--gold);
  background: rgba(242, 193, 78, .07);
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--body-text);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  padding: clamp(46px, 8vw, 92px) 0;
  background: linear-gradient(140deg, rgba(11, 61, 46, .95) 0%, #06202C 58%, var(--night) 100%);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -8%;
  width: 44%;
  height: 200%;
  background: linear-gradient(180deg, rgba(61, 220, 132, .18), rgba(25, 227, 209, 0));
  transform: rotate(17deg);
  pointer-events: none;
}

.page-about .about-cta > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-cta__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-cta h2 {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.14;
  color: var(--mist);
}

.page-about .about-cta__lead {
  max-width: 52ch;
  margin: 0;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.82;
  color: var(--body-text);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-content: start;
}

/* ---------- 响应式 ---------- */

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

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

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

@media (min-width: 880px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    gap: clamp(32px, 6vw, 72px);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: clamp(88px, 10vw, 120px);
    align-self: start;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(250px, .8fr);
    align-items: end;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-cta__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (max-width: 420px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .tab {
    flex: 1 1 100%;
    text-align: left;
  }
}

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