.page-about {
  --about-rule: rgba(13, 22, 32, 0.12);
  --about-rule-dark: rgba(221, 230, 238, 0.16);
  --about-rule-dark-strong: rgba(221, 230, 238, 0.32);
  --about-river-veil: rgba(20, 69, 110, 0.4);
  overflow-x: hidden;
}

/* ============ Hero ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--deep);
  padding-top: calc(var(--header-space) + 20px);
  padding-bottom: clamp(44px, 8vw, 92px);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 58%;
}

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(158deg, rgba(10, 42, 73, 0.94) 0%, rgba(10, 42, 73, 0.66) 44%, rgba(6, 27, 47, 0.95) 100%),
    linear-gradient(0deg, rgba(10, 42, 73, 0.55), rgba(10, 42, 73, 0.55));
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .about-hero .breadcrumbs__link {
  color: var(--mist);
}

.page-about .about-hero .breadcrumbs__link:hover {
  color: var(--cyan);
}

.page-about .about-hero .breadcrumbs__current {
  color: var(--rock);
}

.page-about .about-hero__eyebrow {
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 15ch;
  color: var(--cream);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 8.4vw, 88px);
  line-height: 1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  margin: clamp(18px, 3vw, 28px) 0 0;
  color: var(--mist);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--about-rule-dark);
  list-style: none;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__stat-num {
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-hero__stat-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-index a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--about-rule-dark);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease);
}

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

/* ============ 通用正文 ============ */
.page-about .about-prose {
  max-width: 64ch;
}

.page-about .about-prose p {
  margin: 0 0 1.2em;
  font-size: clamp(16px, 1.7vw, 17.5px);
  line-height: 1.85;
}

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

/* ============ 起点 ============ */
.page-about .about-origin {
  background: var(--cream);
  color: var(--ink);
  padding: clamp(52px, 8vw, 100px) 0;
}

.page-about .about-origin__eyebrow {
  color: var(--moss);
  margin: 0 0 12px;
}

.page-about .about-origin__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 20ch;
  color: var(--ink);
}

.page-about .about-origin__prose p {
  color: var(--ink);
}

.page-about .about-origin__who {
  list-style: none;
  margin: clamp(38px, 6vw, 64px) 0 0;
  padding: 0;
}

.page-about .about-origin__who-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-origin__who-item:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-origin__who-code {
  font-size: 15px;
  font-weight: 700;
  color: var(--clay);
  padding-top: 4px;
}

.page-about .about-origin__who-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-origin__who-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

/* ============ 成长节点 ============ */
.page-about .about-timeline {
  background: var(--deep);
  color: var(--mist);
  padding: clamp(52px, 8vw, 100px) 0;
}

.page-about .about-timeline__eyebrow {
  color: var(--orange-soft);
  margin: 0 0 12px;
}

.page-about .about-timeline__title {
  margin: 0 0 14px;
  color: var(--cream);
}

.page-about .about-timeline__intro {
  margin: 0 0 clamp(28px, 4vw, 44px);
  max-width: 50ch;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-timeline__tabs {
  display: grid;
  gap: 24px;
}

.page-about .about-timeline__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--about-rule-dark);
  scrollbar-width: thin;
}

.page-about .about-timeline__tab {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-start;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--about-rule-dark);
  border-radius: 10px;
  color: var(--mist);
  font: inherit;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-timeline__code {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--rock);
  transform-origin: left center;
  transition: color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .about-timeline__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
  transition: color 0.24s var(--ease);
}

.page-about .about-timeline__tab:hover {
  border-color: var(--about-rule-dark-strong);
}

.page-about .about-timeline__tab:hover .about-timeline__code {
  transform: scale(1.1);
  color: var(--orange-soft);
}

.page-about .about-timeline__tab[aria-selected="true"] {
  border-color: var(--cyan);
  background: rgba(43, 227, 192, 0.08);
}

.page-about .about-timeline__tab[aria-selected="true"] .about-timeline__code {
  color: var(--cyan);
}

.page-about .about-timeline__tab[aria-selected="true"] .about-timeline__label {
  color: var(--cream);
}

.page-about .about-timeline__panel {
  max-width: 62ch;
}

.page-about .about-timeline__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  color: var(--cream);
  line-height: 1.3;
}

.page-about .about-timeline__panel p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-timeline__meta {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule-dark);
  font-size: 12.5px;
  color: var(--rock);
  letter-spacing: 0.02em;
}

/* ============ 团队 ============ */
.page-about .about-team {
  background: var(--cream);
  color: var(--ink);
  padding: clamp(52px, 8vw, 100px) 0;
}

.page-about .about-team__eyebrow {
  color: var(--clay);
  margin: 0 0 12px;
}

.page-about .about-team__title {
  margin: 0;
  max-width: 22ch;
  color: var(--ink);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(34px, 5vw, 56px);
  margin-top: clamp(30px, 5vw, 50px);
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--about-rule);
  transition: background 0.28s var(--ease);
}

.page-about .about-team__row:last-child {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-team__num {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--rock);
  transition: color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-team__row:hover .about-team__num,
.page-about .about-team__row:focus-within .about-team__num {
  color: var(--orange);
  transform: translateX(4px);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team__role p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-team__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  object-fit: cover;
  border: 1px solid var(--about-rule);
}

.page-about .about-team__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--rock);
}

/* ============ 更新节奏 ============ */
.page-about .about-cadence {
  background: var(--river);
  color: var(--mist);
  padding: clamp(52px, 8vw, 100px) 0;
}

.page-about .about-cadence__eyebrow {
  color: var(--orange-soft);
  margin: 0 0 12px;
}

.page-about .about-cadence__title {
  margin: 0;
  color: var(--cream);
}

.page-about .about-cadence__banner {
  margin: clamp(26px, 4vw, 40px) 0 clamp(28px, 4vw, 44px);
}

.page-about .about-cadence__banner img {
  display: block;
  width: 100%;
  height: clamp(130px, 24vw, 230px);
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--about-rule-dark);
}

.page-about .about-cadence__scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-cadence__table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .about-cadence__table thead th {
  padding: 0 18px 14px 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--rock);
  border-bottom: 1px solid var(--about-rule-dark-strong);
}

.page-about .about-cadence__table tbody th,
.page-about .about-cadence__table tbody td {
  padding: 16px 18px 16px 0;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid var(--about-rule-dark);
  color: var(--mist);
}

.page-about .about-cadence__table tbody th {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13.5px;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-cadence__table tbody tr {
  transition: background 0.24s var(--ease);
}

.page-about .about-cadence__table tbody tr:hover {
  background: var(--about-river-veil);
}

.page-about .about-cadence__table a {
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px solid var(--orange-soft);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-cadence__table a:hover,
.page-about .about-cadence__table a:focus-visible {
  color: var(--orange-soft);
  border-color: var(--orange-soft);
}

/* ============ 运营所在地 ============ */
.page-about .about-base {
  background: var(--deep-2);
  color: var(--mist);
  padding: clamp(52px, 8vw, 100px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-base__grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}

.page-about .about-base__eyebrow {
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .about-base__title {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 16ch;
  color: var(--cream);
}

.page-about .about-base__text {
  margin: 0 0 1.1em;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-base__facts {
  margin: 0;
  display: grid;
  gap: 0;
  align-content: start;
}

.page-about .about-base__fact {
  padding: 16px 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-base__fact:last-child {
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-base__fact dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .about-base__fact dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--cream);
  word-break: break-word;
}

.page-about .about-base__cta {
  margin-top: clamp(38px, 6vw, 64px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--about-rule-dark);
  display: grid;
  gap: 20px;
}

.page-about .about-base__cta-text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 32px;
  }

  .page-about .about-base__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 880px) {
  .page-about .about-timeline__tabs {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-timeline__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-rule-dark);
  }

  .page-about .about-timeline__tab {
    margin-left: -1px;
    padding: 16px 0 16px 20px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    white-space: normal;
    background: transparent;
  }

  .page-about .about-timeline__tab:hover {
    background: linear-gradient(90deg, rgba(255, 164, 92, 0.1), transparent 85%);
  }

  .page-about .about-timeline__tab[aria-selected="true"] {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(43, 227, 192, 0.12), transparent 85%);
  }

  .page-about .about-timeline__panels {
    min-width: 0;
    padding-top: 4px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(40px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-team__row {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-base__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(44px, 6vw, 80px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 14ch;
  }

  .page-about .about-origin__who-item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__stat-num,
  .page-about .about-timeline__code,
  .page-about .about-team__num,
  .page-about .about-index a,
  .page-about .about-cadence__table tbody tr {
    transition: none;
  }
}