.page-about {
  --ov-gap: clamp(20px, 3.2vw, 42px);
  --ov-radial: radial-gradient(58% 76% at 12% 0%, rgba(62, 240, 211, .10), transparent 62%),
               radial-gradient(46% 62% at 100% 100%, rgba(242, 181, 68, .09), transparent 60%);
}

/* ---------- 首屏 ---------- */
.page-about .ov-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 62px) 0 clamp(30px, 4.4vw, 58px);
  border-bottom: 1px solid var(--line-1);
}

.page-about .ov-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ov-radial);
  pointer-events: none;
}

.page-about .ov-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 54px);
}

.page-about .ov-hero h1 {
  margin: 14px 0 18px;
  font-size: clamp(28px, 5vw, 56px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -.02em;
  max-width: 17ch;
  color: var(--paper);
}

.page-about .ov-hero .lede {
  color: var(--paper-2);
  max-width: 58ch;
}

.page-about .ov-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 版本铭牌 */
.page-about .ov-plate {
  position: relative;
  padding: clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line-2);
  border-top: 2px solid var(--amber);
  background: linear-gradient(180deg, rgba(242, 181, 68, .10), rgba(7, 18, 15, .55));
}

.page-about .ov-plate::after {
  content: "";
  position: absolute;
  top: -2px;
  right: -1px;
  width: 28px;
  height: 28px;
  border-top: 1px solid var(--amber);
  border-right: 1px solid var(--amber);
}

.page-about .ov-plate__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--paper-3);
  text-transform: uppercase;
}

.page-about .ov-plate__v {
  margin: 8px 0 18px;
  font-size: clamp(36px, 6.4vw, 60px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--amber);
}

.page-about .ov-plate .rule {
  margin: 0 0 16px;
  border: 0;
  border-top: 1px solid var(--line-1);
}

.page-about .ov-plate__list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .ov-plate__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .ov-plate__list dt {
  font-size: 13px;
  color: var(--paper-3);
}

.page-about .ov-plate__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper);
  text-align: right;
}

/* ---------- 定位段 ---------- */
.page-about .ov-stance__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ov-gap);
}

.page-about .ov-stance__main p {
  margin: 0 0 16px;
  color: var(--paper-2);
  font-size: 15px;
  line-height: 1.85;
  max-width: 62ch;
}

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

.page-about .ov-stance__side {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border: 1px solid var(--line-1);
  background: var(--line-1);
}

.page-about .ov-stance__side .stat {
  background: var(--ink-900);
  padding: 16px 18px;
  display: grid;
  gap: 6px;
}

.page-about .ov-stance__side .stat__k {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper-3);
}

.page-about .ov-stance__side .stat__v {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 三件事 ---------- */
.page-about .ov-pillars__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 34px);
}

.page-about .ov-pillar {
  position: relative;
  padding: 4px 0 4px 20px;
  border-left: 1px solid var(--line-1);
}

.page-about .ov-pillar::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 34px;
  background: var(--cyan);
  transition: height var(--t-slow), background var(--t-fast);
}

.page-about .ov-pillar:hover::before {
  height: 100%;
  background: var(--amber);
}

.page-about .ov-pillar__no {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .ov-pillar h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ov-pillar p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-2);
}

.page-about .ov-link {
  display: inline-block;
  margin-top: 14px;
  padding-bottom: 2px;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 240, 211, .35);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .ov-link::after {
  content: " →";
}

.page-about .ov-link:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.page-about .ov-figure {
  margin: clamp(34px, 5vw, 58px) 0 0;
}

/* ---------- 检索维度 ---------- */
.page-about .ov-index__rows {
  border-top: 1px solid var(--line-2);
}

.page-about .ov-index__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--line-1);
  transition: background var(--t-fast);
}

.page-about .ov-index__k {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .ov-index__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-2);
  max-width: 76ch;
}

.password-never-used { display: none; }

/* ---------- 更新批次 ---------- */
.page-about .ov-log__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4.2vw, 58px);
}

.page-about .ov-log__intro h2 {
  margin: 12px 0 14px;
}

.page-about .ov-log__intro > p {
  margin: 0;
  color: var(--paper-2);
  font-size: 15px;
  line-height: 1.8;
  max-width: 46ch;
}

.page-about .ov-log__figure {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
}

.page-about .ov-log__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ov-log__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-2);
}

.page-about .ov-log__item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) 34px;
}

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

.page-about .ov-log__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--cyan);
  background: var(--ink-900);
}

.page-about .ov-log__item:first-child::before {
  border-color: var(--amber);
  background: var(--amber);
}

.page-about .ov-log__ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 8px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
  border: 1px solid rgba(242, 181, 68, .38);
}

.page-about .ov-log__item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ov-log__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-2);
  max-width: 62ch;
}

/* ---------- 品牌认证 ---------- */
.page-about .ov-assure__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 48px);
  align-items: start;
}

.page-about .ov-assure__text h2 {
  margin: 12px 0 16px;
}

.page-about .ov-assure__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-2);
  max-width: 62ch;
}

.page-about .ov-assure__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ov-assure__panel-k {
  margin: 0 0 18px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--amber);
  text-transform: uppercase;
}

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

.page-about .ov-assure__dl > div {
  display: grid;
  gap: 4px;
}

.page-about .ov-assure__dl dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--paper-3);
}

.page-about .ov-assure__dl dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ov-assure__dl a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 240, 211, .35);
}

.page-about .ov-assure__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-1);
  font-size: 13px;
  line-height: 1.75;
  color: var(--paper-3);
}

/* ---------- 起步 ---------- */
.page-about .ov-start__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 44px);
  padding: clamp(24px, 3.6vw, 44px);
  border: 1px solid var(--line-2);
  background: linear-gradient(120deg, rgba(62, 240, 211, .07), rgba(7, 18, 15, .2) 58%);
}

.page-about .ov-start__inner h2 {
  margin: 0 0 14px;
}

.page-about .ov-start__inner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-2);
  max-width: 66ch;
}

.page-about .ov-start__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .ov-stance__side {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ov-index__row {
    grid-template-columns: 128px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

  .page-about .ov-start__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ov-hero__grid {
    grid-template-columns: 1.35fr .85fr;
    align-items: end;
  }

  .page-about .ov-stance__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .8fr);
  }

  .page-about .ov-stance__side {
    grid-template-columns: 1fr;
    align-content: start;
  }

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

  .page-about .ov-pillar:nth-child(2) {
    margin-top: 36px;
  }

  .page-about .ov-pillar:nth-child(3) {
    margin-top: 72px;
  }

  .page-about .ov-log__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .ov-assure__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ov-pillar::before {
    transition: none;
  }
}
</main>