.page-about {
  --ov-line: var(--ink-700);
  --ov-sec-pad: clamp(34px, 4.6vw, 62px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 2.6vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .ov-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.2vw, 36px) 0 clamp(38px, 5.6vw, 70px);
}

.page-about .ov-hero::before {
  content: "";
  position: absolute;
  inset: -12% -30% auto 38%;
  height: 460px;
  background:
    repeating-linear-gradient(90deg, rgba(31, 43, 68, .55) 0 1px, transparent 1px 58px),
    repeating-linear-gradient(0deg, rgba(31, 43, 68, .55) 0 1px, transparent 1px 58px);
  -webkit-mask-image: radial-gradient(62% 70% at 72% 28%, #000 0%, transparent 76%);
  mask-image: radial-gradient(62% 70% at 72% 28%, #000 0%, transparent 76%);
  pointer-events: none;
}

.page-about .ov-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .ov-eyebrow {
  margin: 0;
  color: var(--qinghai);
}

.page-about .ov-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 6vw, 72px);
  line-height: 1.04;
  letter-spacing: -.028em;
  color: var(--text);
}

.page-about .ov-mark {
  color: var(--lime);
}

.page-about .ov-lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.55vw, 18px);
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .ov-hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ov-facts {
  border-top: 1px solid var(--ov-line);
  border-left: 1px solid var(--ov-line);
  padding: 18px 16px 16px 18px;
  background: linear-gradient(158deg, rgba(19, 28, 46, .92), rgba(11, 18, 32, .35));
}

.page-about .ov-facts-title {
  margin: 0 0 14px;
  color: var(--muted);
}

.page-about .ov-fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .ov-fact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--ov-line);
}

.page-about .ov-fact-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ov-fact-num {
  flex: none;
  min-width: 76px;
  font-size: 19px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .ov-fact-txt {
  flex: 1 1 150px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 档案主体骨架 ---------- */
.page-about .ov-doc {
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .ov-spine {
  display: none;
}

.page-about .ov-flow {
  min-width: 0;
}

.page-about .ov-section {
  position: relative;
  padding: var(--ov-sec-pad) 0;
  border-top: 1px solid var(--ov-line);
  scroll-margin-top: 140px;
}

.page-about .ov-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .ov-idx {
  flex: none;
  padding: 3px 7px;
  border: 1px solid var(--ov-line);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--lime);
}

.page-about .ov-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -.012em;
  color: var(--text);
}

.page-about .ov-body p {
  margin: 0 0 14px;
  max-width: 72ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .ov-lead {
  margin: 0 0 20px;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid var(--lime);
  font-size: clamp(16.5px, 1.8vw, 19px);
  line-height: 1.7;
  color: var(--text);
}

.page-about .ov-quicklist {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ov-quicklist li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ov-line);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .ov-quicklist .mono {
  flex: none;
  font-size: 17px;
  color: var(--orange);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ov-tl {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ov-tl-node {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--ov-line);
  border-left: 2px solid var(--qinghai);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .ov-tl-node:hover,
.page-about .ov-tl-node:focus-within {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .ov-tl-pin {
  display: none;
}

.page-about .ov-tl-ver {
  display: block;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .ov-tl-node h3 {
  margin: 8px 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .ov-tl-txt {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ov-tl-cap {
  margin: 0;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--muted-dim);
  transition: color .2s var(--ease);
}

.page-about .ov-tl-node:hover .ov-tl-cap,
.page-about .ov-tl-node:focus-within .ov-tl-cap {
  color: var(--lime);
}

.page-about .ov-figure {
  margin: clamp(22px, 3.2vw, 34px) 0 0;
}

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

/* ---------- 团队分工 ---------- */
.page-about .ov-crew {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ov-crew-cell {
  background: var(--ink-800);
  border: 1px solid var(--ov-line);
  border-top: 2px solid var(--ov-line);
  transition: border-top-color .2s var(--ease);
}

.page-about .ov-crew-cell[open] {
  border-top-color: var(--lime);
}

.page-about .ov-crew-cell:hover {
  border-top-color: var(--lime);
}

.page-about .ov-crew-cell summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ov-crew-cell summary::-webkit-details-marker {
  display: none;
}

.page-about .ov-crew-cell summary::after {
  content: "＋";
  flex: none;
  font-size: 14px;
  color: var(--lime);
}

.page-about .ov-crew-cell[open] summary::after {
  content: "－";
}

.page-about .ov-crew-idx {
  flex: none;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--lime-dim);
}

.page-about .ov-crew-name {
  flex: 1 1 auto;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ov-crew-num {
  flex: none;
  font-size: 12.5px;
  color: var(--orange);
}

.page-about .ov-crew-body {
  margin: 0 16px;
  padding: 12px 0 16px;
  border-top: 1px solid var(--ov-line);
}

.page-about .ov-crew-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ov-figure--crew {
  max-width: 560px;
}

/* ---------- 数据复核 ---------- */
.page-about .ov-check {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: 8px;
}

.page-about .ov-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: none;
}

.page-about .ov-steps li {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ov-line);
}

.page-about .ov-steps li:first-child {
  padding-top: 0;
}

.page-about .ov-steps li:last-child {
  border-bottom: 0;
}

.page-about .ov-step-num {
  flex: none;
  padding-top: 2px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--qinghai);
}

.page-about .ov-steps h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ov-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ov-check-side {
  padding: 18px 16px;
  background: var(--ink-850);
  border: 1px solid var(--ov-line);
  border-bottom: 2px solid var(--lime);
}

.page-about .ov-side-list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ov-side-row dt {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .ov-side-row dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 覆盖与伙伴 ---------- */
.page-about .ov-reach {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
}

.page-about .ov-reach-copy p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .ov-area-list {
  list-style: none;
  margin: 20px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ov-area-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--ov-line);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .ov-area-list .tag {
  flex: none;
}

.page-about .ov-figure--reach img {
  border: 1px solid var(--ov-line);
}

/* ---------- 服务响应 ---------- */
.page-about .ov-channels {
  display: grid;
  gap: 14px;
  margin-top: 8px;
}

.page-about .ov-channel {
  position: relative;
  padding: 20px 18px 20px;
  background: var(--ink-800);
  border: 1px solid var(--ov-line);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .ov-channel:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .ov-channel--accent {
  border-top: 2px solid var(--orange);
}

.page-about .ov-channel-idx {
  display: block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .ov-channel h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ov-channel p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

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

.page-about .ov-channel-val {
  font-family: var(--font-data);
  font-size: 14px;
  letter-spacing: .01em;
  color: var(--lime) !important;
  word-break: break-all;
}

.page-about .ov-channel-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--qinghai);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 66ch;
}

/* ---------- 收尾 ---------- */
.page-about .ov-outro {
  padding: var(--ov-sec-pad) 0 0;
  border-top: 1px solid var(--ov-line);
}

.page-about .ov-outro h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--text);
}

.page-about .ov-outro-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ov-outro-list li {
  border-bottom: 1px solid var(--ov-line);
}

.page-about .ov-outro-list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 15px 2px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color .18s var(--ease), padding-left .18s var(--ease);
}

.page-about .ov-outro-list a:hover,
.page-about .ov-outro-list a:focus-visible {
  border-left-color: var(--lime);
  padding-left: 12px;
  outline: none;
}

.page-about .ov-outro-name {
  flex: none;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
}

.page-about .ov-outro-desc {
  flex: 1 1 200px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .ov-quicklist {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ov-quicklist li {
    display: block;
    border-bottom: 0;
    border-top: 2px solid var(--ink-700);
    padding: 12px 0 0;
  }

  .page-about .ov-quicklist .mono {
    display: block;
    margin-bottom: 6px;
  }

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

@media (min-width: 820px) {
  .page-about .ov-crew {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .ov-crew > *:nth-child(1) { grid-column: span 7; }
  .page-about .ov-crew > *:nth-child(2) { grid-column: span 5; }
  .page-about .ov-crew > *:nth-child(3) { grid-column: span 5; }
  .page-about .ov-crew > *:nth-child(4) { grid-column: span 7; }

  .page-about .ov-check {
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, .85fr);
    align-items: start;
  }

  .page-about .ov-reach {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ov-tl {
    position: relative;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
    padding-top: 30px;
  }

  .page-about .ov-tl::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 15px;
    height: 1px;
    background: linear-gradient(90deg,
      var(--ink-700) 0%,
      var(--qinghai) 28%,
      var(--lime) 62%,
      var(--orange) 100%);
    opacity: .7;
  }

  .page-about .ov-tl-pin {
    display: block;
    position: absolute;
    top: -16px;
    left: 14px;
    width: 11px;
    height: 11px;
    background: var(--lime);
  }

  .page-about .ov-tl-node {
    padding-top: 18px;
    border-left-width: 1px;
  }

  .page-about .ov-tl-node:nth-child(1) { border-top: 2px solid var(--muted-dim); }
  .page-about .ov-tl-node:nth-child(1) .ov-tl-pin { background: var(--muted-dim); }
  .page-about .ov-tl-node:nth-child(2) { border-top: 2px solid var(--qinghai); }
  .page-about .ov-tl-node:nth-child(2) .ov-tl-pin { background: var(--qinghai); }
  .page-about .ov-tl-node:nth-child(3) { border-top: 2px solid var(--qinghai); }
  .page-about .ov-tl-node:nth-child(3) .ov-tl-pin { background: var(--qinghai); }
  .page-about .ov-tl-node:nth-child(4) { border-top: 2px solid var(--lime-dim); }
  .page-about .ov-tl-node:nth-child(4) .ov-tl-pin { background: var(--lime-dim); }
  .page-about .ov-tl-node:nth-child(5) { border-top: 2px solid var(--orange); }
  .page-about .ov-tl-node:nth-child(5) .ov-tl-pin { background: var(--orange); }
}

@media (min-width: 960px) {
  .page-about .ov-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(268px, .82fr);
    align-items: end;
  }
}

@media (min-width: 1040px) {
  .page-about .ov-doc {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
  }

  .page-about .ov-spine {
    display: block;
    position: sticky;
    top: 136px;
    align-self: start;
  }

  .page-about .ov-spine-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
  }

  .page-about .ov-spine-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
    text-decoration: none;
    color: var(--muted);
    font-size: 12.5px;
    letter-spacing: .16em;
    transition: color .18s var(--ease);
  }

  .page-about .ov-spine-link .mono {
    font-size: 11px;
    letter-spacing: .1em;
    color: var(--lime-dim);
  }

  .page-about .ov-spine-txt {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    line-height: 1.05;
  }

  .page-about .ov-spine-link:hover,
  .page-about .ov-spine-link:focus-visible {
    color: var(--text);
    outline: none;
  }

  .page-about .ov-spine-link:hover .mono,
  .page-about .ov-spine-link:focus-visible .mono {
    color: var(--lime);
  }
}