/* ===== page-about ===== */
.page-about {
  --ab-panel: #0E1624;
  --ab-card: #162233;
  --ab-line: #263850;
  --ab-radius: 10px;
  position: relative;
  overflow-x: clip;
  color: var(--moon);
  font-family: var(--font-body);
  background:
    radial-gradient(1000px 520px at 90% -8%, rgba(33, 245, 227, .13), transparent 60%),
    radial-gradient(760px 440px at -6% 18%, rgba(255, 106, 42, .10), transparent 62%),
    repeating-linear-gradient(90deg, rgba(38, 56, 80, .16) 0 1px, transparent 1px 108px),
    var(--ink-900);
  padding-bottom: clamp(36px, 6vw, 72px);
}

/* --- 面包屑 --- */
.page-about .about-crumb {
  padding-top: clamp(14px, 3vw, 24px);
}
.page-about .about-crumb .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}
.page-about .about-crumb .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-crumb .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .about-crumb .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .about-crumb .breadcrumb [aria-current="page"] {
  color: var(--moon);
}

/* --- 首屏 --- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 4vw, 34px) 0 clamp(26px, 5vw, 48px);
  border-bottom: 1px solid var(--ab-line);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  grid-template-areas:
    "lead"
    "index";
}
.page-about .about-hero__lead {
  grid-area: lead;
  min-width: 0;
}
.page-about .about-index {
  grid-area: index;
  min-width: 0;
}
.page-about .about-hero h1 {
  margin: 10px 0 16px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.85rem, 6.6vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--moon);
}
.page-about .about-hero__intro {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: clamp(.95rem, 2.2vw, 1.06rem);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-hero__meta {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--mist);
  padding-left: 12px;
  border-left: 2px solid var(--line);
}
.page-about .about-hero__stamp {
  display: inline-block;
  margin: 0;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--ink-900);
  background: linear-gradient(120deg, var(--cyan), #7ef2e7);
  border-radius: 3px;
  transform: rotate(-1.6deg);
  box-shadow: 4px 4px 0 rgba(33, 245, 227, .16), 8px 8px 0 rgba(255, 106, 42, .12);
}

/* --- 页内索引 --- */
.page-about .about-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .22em;
  color: var(--mist);
}
.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 7px 11px;
  font-size: .84rem;
  color: var(--mist);
  text-decoration: none;
  background: rgba(22, 34, 51, .7);
  border: 1px solid var(--ab-line);
  border-radius: 6px;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-about .about-index__link:hover {
  color: var(--moon);
  border-color: var(--cyan);
  background: rgba(33, 245, 227, .12);
}
.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 2px;
}
.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--cyan);
}

/* --- 数字条 --- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 4vw, 38px);
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-radius);
  overflow: hidden;
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 14px;
  background: linear-gradient(170deg, var(--ab-card), var(--ab-panel));
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}
.page-about .about-stat:nth-child(2) .about-stat__num { color: var(--orange); }
.page-about .about-stat:nth-child(3) .about-stat__num { color: var(--moon); }
.page-about .about-stat:nth-child(4) .about-stat__num { color: var(--gold); }
.page-about .about-stat__label {
  font-size: .76rem;
  line-height: 1.6;
  color: var(--mist);
}

/* --- 区块通用 --- */
.page-about .about-sec {
  padding: clamp(36px, 7vw, 72px) 0;
  border-bottom: 1px dashed rgba(38, 56, 80, .85);
}
.page-about .about-sec--band {
  background:
    linear-gradient(180deg, rgba(14, 22, 36, .92), rgba(7, 11, 20, .6)),
    repeating-linear-gradient(-45deg, rgba(33, 245, 227, .05) 0 2px, transparent 2px 16px);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}
.page-about .about-sec--gold {
  background: linear-gradient(200deg, rgba(245, 184, 75, .10), transparent 46%, rgba(33, 245, 227, .07));
}
.page-about .about-sec__head {
  max-width: 74ch;
  margin-bottom: clamp(22px, 4vw, 36px);
}
.page-about .about-sec__title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.6vw, 2.05rem);
  line-height: 1.3;
  letter-spacing: -.005em;
  color: var(--moon);
}
.page-about .about-sec__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--mist);
}

/* --- 起点与版图 --- */
.page-about .about-origin {
  display: grid;
  gap: clamp(20px, 4vw, 34px);
}
.page-about .about-origin__body p {
  margin: 0 0 14px;
  font-size: .93rem;
  line-height: 1.9;
  color: var(--mist);
}
.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-facts {
  padding: clamp(18px, 3vw, 26px);
  background: linear-gradient(160deg, rgba(22, 34, 51, .96), rgba(14, 22, 36, .9));
  border: 1px solid var(--ab-line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--ab-radius);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .28);
}
.page-about .about-facts__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--cyan);
}
.page-about .about-facts__list {
  margin: 0;
}
.page-about .about-facts__row {
  display: grid;
  gap: 4px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(38, 56, 80, .8);
}
.page-about .about-facts__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-facts__row dt {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}
.page-about .about-facts__row dd {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--moon);
}

/* --- 团队 --- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}
.page-about .about-team__media {
  min-width: 0;
}
.page-about .about-team__media .img-frame,
.page-about .about-timeline__media .img-frame,
.page-about .member-media .img-frame {
  display: block;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  border-radius: var(--ab-radius);
  background: var(--ab-panel);
}
.page-about .img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-team__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--mist);
}
.page-about .about-team__body p {
  margin: 0 0 20px;
  font-size: .93rem;
  line-height: 1.9;
  color: var(--mist);
}
.page-about .about-flow {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-flow__step {
  position: relative;
  padding: 14px 16px 14px 18px;
  background: rgba(22, 34, 51, .72);
  border: 1px solid var(--ab-line);
  border-left: 2px solid var(--orange);
  border-radius: 8px;
}
.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--orange);
}
.page-about .about-flow__label {
  display: block;
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .96rem;
  color: var(--moon);
}
.page-about .about-flow__text {
  margin: 0;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--mist);
}

/* --- 时间线 --- */
.page-about .about-timeline__media {
  margin-bottom: clamp(20px, 4vw, 32px);
}
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange) 62%, rgba(38, 56, 80, .35));
}
.page-about .tl-node {
  position: relative;
  padding-left: 40px;
}
.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 17px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(33, 245, 227, .12);
}
.page-about .tl-node--now::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 42, .16);
}
.page-about .tl-node__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  list-style: none;
  cursor: pointer;
  background: linear-gradient(135deg, rgba(22, 34, 51, .95), rgba(14, 22, 36, .9));
  border: 1px solid var(--ab-line);
  border-radius: 8px;
  transition: border-color .22s var(--ease), transform .22s var(--ease), background .22s var(--ease);
}
.page-about .tl-node__summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-node__summary:hover {
  border-color: var(--cyan);
  transform: translateX(2px);
}
.page-about .tl-node__summary:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 2px;
}
.page-about .tl-node__details[open] .tl-node__summary {
  border-color: var(--cyan);
  background: linear-gradient(135deg, rgba(33, 245, 227, .12), rgba(14, 22, 36, .92));
}
.page-about .tl-node__year {
  flex: none;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--cyan);
}
.page-about .tl-node--now .tl-node__year {
  color: var(--orange);
}
.page-about .tl-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .96rem;
  color: var(--moon);
}
.page-about .tl-node__body {
  margin: 8px 0 4px 4px;
  padding: 6px 16px 6px 14px;
  border-left: 1px solid rgba(33, 245, 227, .35);
}
.page-about .tl-node__body p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: var(--mist);
}

/* --- 会员服务 --- */
.page-about .member-grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}
.page-about .member-cards {
  display: grid;
  gap: 14px;
}
.page-about .member-card {
  padding: clamp(16px, 3vw, 22px);
  background: linear-gradient(165deg, rgba(22, 34, 51, .92), rgba(14, 22, 36, .88));
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--gold);
  border-radius: 8px;
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.page-about .member-card:hover,
.page-about .member-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(245, 184, 75, .55);
  box-shadow: 0 14px 34px rgba(0, 0, 0, .34);
}
.page-about .member-card__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--moon);
}
.page-about .member-card__text {
  margin: 0;
  font-size: .87rem;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .member-media {
  min-width: 0;
}
.page-about .member-media .img-frame {
  border-color: rgba(245, 184, 75, .4);
}
.page-about .member-media__note {
  margin: 12px 0 0;
  padding-left: 12px;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--gold);
  border-left: 2px solid var(--gold);
}

/* --- 合作与认可 --- */
.page-about .about-partners {
  display: grid;
  gap: clamp(20px, 4vw, 32px);
}
.page-about .partner-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}
.page-about .partner-cloud__tag {
  display: inline-block;
  padding: 7px 13px;
  font-size: .82rem;
  border-radius: 4px;
}
.page-about .partner-cloud li:nth-child(2n) .partner-cloud__tag {
  color: var(--orange);
  border-color: rgba(255, 106, 42, .5);
  background: rgba(255, 106, 42, .1);
}
.page-about .partner-cloud li:nth-child(3n) .partner-cloud__tag {
  color: var(--moon);
  border-color: var(--ab-line);
  background: rgba(22, 34, 51, .9);
}
.page-about .about-partners__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.9;
  color: var(--mist);
}
.page-about .about-honor {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-honor__item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: linear-gradient(150deg, rgba(33, 245, 227, .08), rgba(14, 22, 36, .9));
  border: 1px solid var(--ab-line);
  border-radius: 8px;
}
.page-about .about-honor__mark {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--cyan);
}
.page-about .about-honor__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--moon);
}

/* --- 下一步 --- */
.page-about .about-next {
  padding: clamp(34px, 6vw, 64px) 0 clamp(10px, 2vw, 20px);
}
.page-about .about-next__inner {
  display: grid;
  gap: clamp(20px, 4vw, 32px);
  padding: clamp(22px, 4vw, 40px);
  background:
    radial-gradient(520px 260px at 100% 0%, rgba(255, 106, 42, .16), transparent 62%),
    linear-gradient(150deg, rgba(22, 34, 51, .96), rgba(7, 11, 20, .96));
  border: 1px solid var(--ab-line);
  border-radius: 14px;
}
.page-about .about-next__title {
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  line-height: 1.3;
  color: var(--moon);
}
.page-about .about-next__text {
  margin: 0 0 12px;
  max-width: 60ch;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-next__note {
  margin: 0;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--mist);
  padding-left: 10px;
  border-left: 2px solid var(--orange);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}
.page-about .about-next__links .btn {
  flex: 1 1 160px;
  text-align: center;
}

/* --- 响应式 --- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .member-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
  .page-about .member-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: center;
  }
  .page-about .about-next__links {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 208px minmax(0, 1fr);
    grid-template-areas: "index lead";
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--hdr-h) + 28px);
    padding-right: 8px;
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 3px;
  }
  .page-about .about-index__link {
    background: transparent;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 7px 8px 7px 12px;
  }
  .page-about .about-index__link:hover {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(33, 245, 227, .14), transparent);
  }
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-flow__step {
    padding: 16px 14px 16px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .tl-node__summary,
  .page-about .member-card {
    transition: none;
  }
  .page-about .tl-node__summary:hover,
  .page-about .member-card:hover,
  .page-about .member-card:focus-within {
    transform: none;
  }
  .page-about .about-hero__stamp {
    transform: none;
  }
}