.page-about {
  --ab-line: rgba(110, 136, 153, .28);
  --ab-tint: rgba(61, 220, 223, .08);
}

/* ===== 面包屑留白 ===== */
.page-about .crumbs {
  padding-top: clamp(16px, 2.4vw, 28px);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
  padding-top: clamp(22px, 3.6vw, 52px);
  padding-bottom: clamp(28px, 5vw, 66px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 32em;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.8;
  color: var(--white);
  opacity: .78;
}

.page-about .about-hero__lead--tight {
  margin-top: 12px;
  font-size: 15px;
  color: var(--cyan-soft);
  opacity: .9;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__visual {
  min-width: 0;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--hair-cyan);
  border-radius: var(--radius-lg);
}

.page-about .about-hero__cap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--line);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }
}

/* ===== 索引 + 章节流 ===== */
.page-about .about-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 44px);
  padding-top: clamp(18px, 3vw, 38px);
  padding-bottom: clamp(44px, 6vw, 92px);
}

.page-about .about-shell__annot {
  display: none;
}

.page-about .about-index__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--orange-soft);
  opacity: .85;
  text-transform: uppercase;
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
}

.page-about .about-index__link {
  display: block;
  padding: 7px 0;
  border-bottom: 1px solid var(--ab-line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--line);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .about-index__link[data-current-section],
.page-about .about-index__link.is-current {
  color: var(--cyan);
  border-color: var(--hair-cyan);
}

@media (min-width: 1020px) {
  .page-about .about-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-index__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
}

@media (min-width: 1360px) {
  .page-about .about-shell__annot {
    display: block;
    position: absolute;
    top: 110px;
    right: -44px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .3em;
    color: var(--orange-soft);
    opacity: .5;
  }
}

/* ===== 章节 ===== */
.page-about .about-flow {
  min-width: 0;
}

.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(28px, 4vw, 52px) 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-flow > .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: .02em;
  color: var(--ab-tint);
  -webkit-text-stroke: 1px rgba(61, 220, 223, .5);
}

.page-about .chapter__body {
  min-width: 0;
}

.page-about .chapter__body h2 {
  margin: 0 0 14px;
  font-size: clamp(21px, 2.7vw, 31px);
  font-weight: 900;
  line-height: 1.32;
  letter-spacing: -.005em;
  color: var(--white);
}

.page-about .chapter__body p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.82;
  color: var(--white);
  opacity: .76;
}

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

@media (min-width: 760px) {
  .page-about .chapter {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 0 34px;
  }
}

/* ===== 引言块 ===== */
.page-about .about-pull {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 3px solid var(--orange);
  background: linear-gradient(100deg, rgba(255, 138, 61, .1), rgba(6, 27, 46, 0) 70%);
}

.page-about .about-pull__text {
  margin: 0;
  flex: 1 1 260px;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
  opacity: .9;
}

/* ===== 场景卡片 ===== */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.page-about .about-inline-link {
  margin: 20px 0 0;
  font-size: 15px;
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--hair-cyan);
  padding-bottom: 2px;
}

.page-about .about-inline-link a:hover {
  color: var(--orange-soft);
  border-color: var(--orange-soft);
}

@media (min-width: 820px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ===== 六个栏目 ===== */
.page-about .about-columns {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-col {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ab-line);
  transition: background var(--dur) var(--ease);
}

.page-about .about-col:hover {
  background: rgba(61, 220, 223, .05);
}

.page-about .about-col__no {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange-soft);
  padding-top: 3px;
}

.page-about .about-col__name {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-col__name a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-col__name a:hover {
  color: var(--cyan);
  border-color: var(--hair-cyan);
}

.page-about .about-col__main p {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.72;
  color: var(--white);
  opacity: .68;
}

/* ===== 团队 ===== */
.page-about .about-team__media {
  margin: 20px 0 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-lg);
}

.page-about .about-filter {
  margin-top: 24px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 18px;
}

@media (min-width: 720px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ===== 时间线 ===== */
.page-about .about-timeline__media {
  margin: 20px 0 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-lg);
}

.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(61, 220, 223, .1));
}

.page-about .about-tl {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 26px 26px;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
}

.page-about .about-tl__mark {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-tl__ver {
  font-size: 15px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-tl__year {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--line);
}

.page-about .about-tl__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 33em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
  opacity: .7;
}

.page-about .about-tl__note {
  margin: 8px 0 0;
  max-width: 33em;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--cyan-soft);
  opacity: .85;
}

@media (min-width: 760px) {
  .page-about .about-tl {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 0 24px;
    padding-left: 30px;
  }

  .page-about .about-tl__mark {
    flex-direction: column;
    gap: 2px;
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .about-tl__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
  }

  .page-about .about-tl:hover .about-tl__note,
  .page-about .about-tl:focus-within .about-tl__note {
    max-height: 8em;
    margin-top: 10px;
    opacity: .9;
  }
}

/* ===== 协作数据 ===== */
.page-about .about-stats {
  margin: 22px 0 20px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-stats .stat-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-stats .stat-row__label {
  font-size: 15px;
  color: var(--white);
  opacity: .72;
}

.page-about .about-stats .data-num {
  font-size: 17px;
  font-weight: 700;
}

/* ===== 联系 ===== */
.page-about .about-reach {
  margin-top: 22px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--hair-cyan);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(61, 220, 223, .12), rgba(6, 27, 46, 0) 62%), var(--card);
}

.page-about .about-reach__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  margin: 0;
  padding: 12px 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-reach__row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-reach__label {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--line);
}

.page-about .about-reach__value {
  font-size: 16px;
  line-height: 1.6;
  color: var(--white);
  text-align: left;
  word-break: break-word;
}

.page-about .about-reach__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cyan-soft);
  opacity: .85;
}

.page-about .about-reach__actions {
  margin-top: 22px;
}

@media (min-width: 620px) {
  .page-about .about-reach__row {
    grid-template-columns: 118px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}