.page-about {
  --ob-line: rgba(11, 59, 79, .18);
  --ob-line-invert: rgba(230, 238, 241, .16);
}

/* ---------- 段落标题组 ---------- */
.page-about .ob-head {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 32px;
}

.page-about .ob-head__num {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: .3em;
  padding-top: 5px;
  color: var(--clay);
}

.page-about .ob-head h2 {
  font-family: var(--font-title);
  font-size: clamp(23px, 6vw, 36px);
  line-height: 1.3;
  letter-spacing: .05em;
  margin: 10px 0 0;
}

.page-about .ob-hero .eyebrow,
.page-about .section--deep .eyebrow,
.page-about .section--tide .eyebrow {
  color: var(--sand);
}

.page-about .section--mist .eyebrow,
.page-about .section--paper .eyebrow {
  color: var(--clay);
}

.page-about .section--deep .ob-head__num,
.page-about .section--tide .ob-head__num {
  color: var(--sand);
}

.page-about .section--deep .ob-lede,
.page-about .ob-hero .lede {
  color: rgba(230, 238, 241, .82);
}

/* ---------- 首屏 ---------- */
.page-about .ob-hero .crumb {
  margin-bottom: 32px;
  font-size: 14px;
  color: rgba(230, 238, 241, .55);
}

.page-about .ob-hero .crumb a {
  color: rgba(230, 238, 241, .78);
}

.page-about .ob-hero__grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .ob-hero h1 {
  font-family: var(--font-title);
  font-size: clamp(28px, 7.4vw, 54px);
  line-height: 1.2;
  letter-spacing: .05em;
  margin: 12px 0 20px;
  color: var(--mist);
}

.page-about .ob-hero .lede {
  font-size: 17px;
  line-height: 1.9;
  max-width: 44ch;
  margin: 0;
}

.page-about .ob-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--ob-line-invert);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ob-fact {
  background: var(--deep);
  padding: 16px 18px;
}

.page-about .ob-fact dt {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--stone);
  margin-bottom: 6px;
}

.page-about .ob-fact dd {
  margin: 0;
  font-family: var(--font-title);
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--sand);
}

.page-about .ob-hero__figure {
  margin: 44px 0 0;
}

.page-about .ob-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--r-lg);
}

.page-about .ob-hero__figure figcaption {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(230, 238, 241, .58);
}

/* ---------- 时间带 ---------- */
.page-about .ob-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ob-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--clay), rgba(169, 98, 74, .15));
}

.page-about .ob-track__step {
  position: relative;
  padding: 0 0 30px 38px;
  outline: none;
}

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

.page-about .ob-track__dot {
  position: absolute;
  left: 1px;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: var(--r-pill);
  background: var(--mist);
  border: 2px solid var(--clay);
  transition: background 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .ob-track__step:hover .ob-track__dot,
.page-about .ob-track__step:focus-visible .ob-track__dot,
.page-about .ob-track__step:focus .ob-track__dot {
  background: var(--coral);
  border-color: var(--coral);
  transform: scale(1.18);
}

.page-about .ob-track__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--clay);
  margin-bottom: 6px;
}

.page-about .ob-track__title {
  font-family: var(--font-title);
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: .05em;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .ob-track__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
  overflow: hidden;
}

/* ---------- 团队 ---------- */
.page-about .ob-team__grid {
  align-items: start;
  gap: 36px;
}

.page-about .ob-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ob-team__list li {
  padding-left: 16px;
  border-left: 2px solid rgba(169, 98, 74, .3);
  font-size: 16px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .ob-team__list strong {
  display: block;
  font-family: var(--font-title);
  font-size: 16px;
  letter-spacing: .05em;
  color: var(--ink);
  margin-bottom: 4px;
}

.page-about .ob-team__figure {
  margin: 0;
}

.page-about .ob-team__figure .figure__img {
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ob-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ob-team__bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 44px;
}

.page-about .ob-seg {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--r-sm);
  outline: none;
  cursor: default;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .ob-seg--dev {
  background: var(--tide);
  color: var(--mist);
}

.page-about .ob-seg--doc {
  background: var(--clay);
  color: var(--paper);
}

.page-about .ob-seg--ops {
  background: var(--moss);
  color: var(--paper);
}

.page-about .ob-seg--design {
  background: var(--sand);
  color: var(--ink);
}

.page-about .ob-seg:hover,
.page-about .ob-seg:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(6, 35, 47, .22);
}

.page-about .ob-seg__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1;
  letter-spacing: .02em;
}

.page-about .ob-seg__name {
  font-family: var(--font-title);
  font-size: 14px;
  letter-spacing: .06em;
}

/* ---------- 覆盖 ---------- */
.page-about .ob-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(230, 238, 241, .16);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ob-stat {
  background: var(--tide);
  padding: 22px 18px;
}

.page-about .ob-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--sand);
  margin-bottom: 8px;
}

.page-about .ob-stat__label {
  display: block;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(230, 238, 241, .72);
}

.page-about .ob-reach__note {
  margin: 32px 0 0;
  font-size: 16px;
  line-height: 1.95;
  color: rgba(230, 238, 241, .82);
  max-width: 62ch;
}

/* ---------- 版本说明 ---------- */
.page-about .ob-version__grid {
  gap: 36px;
  align-items: start;
}

.page-about .ob-version__figure {
  margin: 0;
}

.page-about .ob-version__figure .figure__img {
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ob-version__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ob-version__figure .figure__cap,
.page-about .ob-team__figure .figure__cap {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .ob-version__intro,
.page-about .ob-version__tail {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--stone);
}

.page-about .ob-version__tail {
  margin: 24px 0 0;
}

.page-about .ob-version__keys {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ob-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ob-version__keys li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  background: var(--paper);
  padding: 15px 18px;
}

.page-about .ob-version__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--clay);
}

.page-about .ob-version__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 资质 ---------- */
.page-about .ob-creds__grid {
  display: grid;
  gap: 16px;
}

.page-about .ob-cred {
  padding: 24px 22px;
  border-radius: var(--r-md);
  background: var(--paper);
  border: 1px solid var(--ob-line);
  outline: none;
  cursor: default;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .ob-cred:hover,
.page-about .ob-cred:focus-visible {
  transform: translateY(-4px);
  box-shadow: 0 12px 26px rgba(6, 35, 47, .14);
  border-color: rgba(255, 107, 74, .55);
}

.page-about .ob-cred__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--stone);
}

.page-about .ob-cred__value {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: .03em;
  color: var(--ink);
}

.page-about .ob-cred__value--mono {
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: .02em;
  word-break: break-all;
  color: var(--clay);
}

.page-about .ob-cred__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 接下来的方向 ---------- */
.page-about .ob-next h2 {
  font-family: var(--font-title);
  font-size: clamp(24px, 6vw, 38px);
  line-height: 1.3;
  letter-spacing: .05em;
  margin: 12px 0 20px;
  color: var(--mist);
}

.page-about .ob-next p {
  margin: 0 0 28px;
  font-size: 17px;
  line-height: 1.95;
  color: rgba(230, 238, 241, .8);
}

.page-about .ob-next__list {
  list-style: none;
  margin: 0 0 36px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ob-next__list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(230, 238, 241, .82);
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(230, 238, 241, .14);
}

.page-about .ob-next__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--sand);
}

.page-about .ob-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ================= 平板与桌面 ================= */
@media (min-width: 720px) {
  .page-about .ob-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .ob-team__bar {
    flex-direction: row;
    gap: 4px;
    margin-top: 52px;
  }

  .page-about .ob-seg {
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-start;
    min-height: 118px;
    padding: 18px 16px;
  }

  .page-about .ob-seg--dev { flex: 32 1 0; }
  .page-about .ob-seg--doc { flex: 14 1 0; }
  .page-about .ob-seg--ops { flex: 12 1 0; }
  .page-about .ob-seg--design { flex: 10 1 0; }
}

@media (min-width: 860px) {
  .page-about .ob-head {
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 20px;
    margin-bottom: 42px;
  }

  .page-about .ob-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 60px;
    align-items: end;
  }

  .page-about .ob-hero__figure {
    margin-top: 56px;
  }

  /* 时间带转为横向 */
  .page-about .ob-track {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .ob-track::before {
    left: 6px;
    right: 0;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--clay), rgba(169, 98, 74, .18) 88%);
  }

  .page-about .ob-track__step {
    padding: 40px 26px 0 0;
  }

  .page-about .ob-track__step:last-child {
    padding-right: 0;
  }

  .page-about .ob-track__dot {
    left: 0;
    top: 2px;
  }

  .page-about .ob-version__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    gap: 60px;
  }

  .page-about .ob-cred {
    padding: 28px 24px;
  }

  .page-about .ob-next__actions {
    gap: 16px;
  }
}

@media (hover: hover) and (min-width: 860px) {
  .page-about .ob-track__note {
    max-height: 0;
    opacity: 0;
    transform: translateY(-6px);
    transition: max-height 300ms var(--ease), opacity 240ms var(--ease), transform 300ms var(--ease);
  }

  .page-about .ob-track__step:hover .ob-track__note,
  .page-about .ob-track__step:focus .ob-track__note,
  .page-about .ob-track__step:focus-within .ob-track__note {
    max-height: 14em;
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 1080px) {
  .page-about .ob-hero__grid {
    gap: 80px;
  }

  .page-about .ob-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ob-stat {
    padding: 26px 20px;
  }
}