.page-about .about-hero {
  background:
    radial-gradient(130% 100% at 90% -10%, rgba(46, 125, 209, 0.25), transparent 60%),
    linear-gradient(180deg, var(--night-2) 0%, var(--night) 100%);
  border-bottom: var(--edge);
  padding: clamp(22px, 4vw, 48px) 0 clamp(34px, 6vw, 72px);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--stack);
  align-items: start;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(29px, 5.6vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--snow);
  margin: 12px 0 18px;
  text-wrap: balance;
}

.page-about .about-hero .lede {
  color: var(--dust);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__aside {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 2.4vw, 26px);
  background: rgba(18, 41, 74, 0.82);
  border: var(--edge);
  box-shadow: var(--hard);
}

.page-about .about-fact {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-fact__value {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
  letter-spacing: -0.02em;
}

.page-about .about-fact__unit {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--yellow);
}

.page-about .about-fact__label {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--dust);
}

/* ---------- 左侧索引 ---------- */

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

.page-about .about-index__title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--dust);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__link {
  display: block;
  padding: 9px 12px;
  border-left: 2px solid var(--line);
  color: var(--dust);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover {
  color: var(--snow);
  border-left-color: var(--blue);
}

.page-about .about-index__link[data-active] {
  color: var(--snow);
  border-left-color: var(--yellow);
  background: rgba(46, 125, 209, 0.16);
}

.page-about .about-index__note {
  margin: 24px 0 0;
  height: 168px;
  overflow: hidden;
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--dust);
}

/* ---------- 章节块 ---------- */

.page-about .about-block {
  padding: clamp(36px, 6vw, 72px) 0;
  border-top: var(--edge);
}

.page-about .about-block:first-child {
  border-top: 0;
  padding-top: clamp(24px, 3vw, 40px);
}

.page-about .about-block .section__title {
  margin: 10px 0 clamp(16px, 2.4vw, 24px);
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .about-block .prose {
  color: var(--dust);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0;
  border: var(--edge);
  box-shadow: var(--hard-lg);
}

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

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--yellow) 48%, var(--line) 100%);
  opacity: 0.7;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 34px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border: 2px solid var(--line);
  background: var(--night);
  box-shadow: 0 0 0 4px var(--night);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--yellow);
  background: var(--yellow);
}

.page-about .about-timeline__year {
  margin: 0 0 4px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  color: var(--snow);
  line-height: 1.4;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dust);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--stack);
  align-items: start;
}

.page-about .about-team__item {
  border-left: 2px solid var(--line);
  padding: 2px 0 2px 16px;
  margin-bottom: 20px;
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .about-team__item:hover {
  border-left-color: var(--blue);
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dust);
}

.page-about .about-team__figure {
  margin: 0;
  border: var(--edge);
  box-shadow: var(--hard-lg);
}

/* ---------- 六个栏目 ---------- */

.page-about .about-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--line);
  border: var(--edge);
  box-shadow: var(--hard);
}

.page-about .about-column {
  background: var(--night-2);
  padding: clamp(18px, 2.4vw, 26px);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-column:hover {
  background: rgba(46, 125, 209, 0.14);
  box-shadow: inset 0 0 0 2px var(--blue);
}

.page-about .about-column__num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--yellow);
}

.page-about .about-column__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-column p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dust);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--line);
  border: var(--edge);
  box-shadow: var(--hard);
}

.page-about .about-coverage__cell {
  background: var(--night);
  padding: clamp(16px, 2.2vw, 26px);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-coverage__cell:hover {
  transform: translateY(-2px);
}

.page-about .about-coverage__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(28px, 4.2vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
  letter-spacing: -0.02em;
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-coverage__cell:hover .about-coverage__num {
  transform: scale(1.06);
  color: var(--yellow);
}

.page-about .about-coverage__unit {
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.page-about .about-coverage__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--dust);
}

.page-about .about-coverage__note {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--dust);
  max-width: 62ch;
}

/* ---------- 一轮的节奏 ---------- */

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  margin-top: clamp(20px, 3vw, 30px);
  background: var(--line);
  border: var(--edge);
  box-shadow: var(--hard);
}

.page-about .about-flow__step {
  background: var(--night-2);
  padding: clamp(16px, 2.2vw, 24px);
  border-top: 3px solid var(--line);
}

.page-about .about-flow__step:nth-child(1) {
  border-top-color: var(--blue);
}

.page-about .about-flow__step:nth-child(2) {
  border-top-color: var(--yellow);
}

.page-about .about-flow__step:nth-child(3) {
  border-top-color: var(--red);
}

.page-about .about-flow__step:nth-child(4) {
  border-top-color: var(--green);
}

.page-about .about-flow__time {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.page-about .about-flow__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-flow__step p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dust);
}

/* ---------- 版本与反馈 ---------- */

.page-about .about-feedback {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--stack);
  padding: clamp(20px, 3vw, 34px);
  background:
    linear-gradient(140deg, rgba(46, 125, 209, 0.18) 0%, transparent 62%),
    var(--night-2);
  border: var(--edge);
  box-shadow: var(--hard-lg);
}

.page-about .about-feedback__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--dust);
  max-width: 62ch;
}

.page-about .about-feedback__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(16px, 2.4vw, 22px);
}

.page-about .about-feedback__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: var(--edge);
  align-self: start;
}

.page-about .about-feedback__stat {
  background: var(--night);
  padding: clamp(14px, 2vw, 22px);
}

.page-about .about-feedback__num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
}

.page-about .about-feedback__unit {
  font-size: 12px;
  font-weight: 400;
  color: var(--yellow);
  letter-spacing: 0.1em;
}

.page-about .about-feedback__cap {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dust);
}

/* ---------- 收尾 CTA ---------- */

.page-about .about-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 28px);
  align-items: center;
  padding: clamp(22px, 3.2vw, 34px);
  background: var(--ink);
  border: var(--edge);
  box-shadow: var(--hard-lg);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .about-cta__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--dust);
  max-width: 58ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-columns {
    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-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 104px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-coverage {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-feedback {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-coverage__cell:hover,
  .page-about .about-coverage__cell:hover .about-coverage__num {
    transform: none;
  }
}