.page-about {
  --about-rail: 88px;
  --about-node-gap: 56px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: max(600px, 78svh);
  padding-top: calc(var(--header-h) + 88px);
  padding-bottom: 56px;
  overflow: hidden;
  background: var(--ink-900);
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 10, 22, 0.88) 0%, rgba(5, 10, 22, 0.58) 40%, #050A16 100%),
    linear-gradient(96deg, rgba(5, 10, 22, 0.96) 0%, rgba(5, 10, 22, 0.42) 56%, rgba(5, 10, 22, 0.78) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  max-width: 17em;
  font-size: clamp(29px, 6.2vw, 56px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 0 0 38px;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  max-width: 620px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__facts > div {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 15px 18px;
  background: rgba(11, 27, 51, 0.82);
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  border-bottom: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .about-crumbs .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-block: 18px;
  font-size: 13px;
  color: var(--text-2);
}

.page-about .about-crumbs a {
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-crumbs a:hover {
  color: var(--cyan);
}

.page-about .about-crumbs__sep {
  color: var(--line);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--text);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  background: var(--ink-900);
}

.page-about .about-block {
  padding-block: 68px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-block--last {
  border-bottom: 0;
  padding-bottom: 88px;
}

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

.page-about .about-block__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-block__title {
  margin: 0 0 16px;
  font-size: clamp(22px, 3.3vw, 35px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-block__lede {
  margin: 0 0 30px;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text-2);
}

.page-about .about-prose p {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-prose--tight {
  margin-top: 30px;
}

.page-about .about-prose--tight p {
  font-size: 15px;
  color: var(--text-2);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: 6px;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: -28px -20px;
  overflow: hidden;
  opacity: 0.07;
  pointer-events: none;
}

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

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .tl-node {
  position: relative;
  padding-left: 30px;
  padding-bottom: 52px;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--line);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .tl-node:hover::before,
.page-about .tl-node.is-active::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl-node__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-2);
  transition: color 0.2s ease;
}

.page-about .tl-node.is-active .tl-node__year,
.page-about .tl-node:hover .tl-node__year {
  color: var(--cyan);
}

.page-about .tl-node__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .tl-node__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

/* ---------- 双端切换 ---------- */
.page-about .about-switch {
  margin-top: 4px;
}

.page-about .about-switch .switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-switch__panels {
  display: grid;
  gap: 0;
}

.page-about .about-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding: 26px 20px;
  border: 1px solid var(--line);
  background:
    linear-gradient(150deg, rgba(47, 227, 240, 0.07) 0%, rgba(11, 27, 51, 0.9) 42%, var(--panel-blue) 100%);
}

.page-about .about-panel[hidden] {
  display: none;
}

.page-about .about-panel__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-panel__desc {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.page-about .about-panel__list li {
  display: flex;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .about-panel__list li::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: 9px;
  background: var(--cyan);
}

.page-about .about-panel__media {
  margin: 0;
}

.page-about .about-panel__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

/* ---------- 团队比例 ---------- */
.page-about .about-team {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .team-row {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-row__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .team-row__name {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .team-row__count {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .team-row__unit {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--text-2);
}

.page-about .team-row__bar {
  height: 6px;
  background: rgba(28, 58, 97, 0.55);
  overflow: hidden;
}

.page-about .team-row__bar span {
  display: block;
  height: 100%;
  transition: filter 0.2s ease;
}

.page-about .about-team .team-row:nth-child(1) .team-row__bar span { width: 25%; background: #2FE3F0; }
.page-about .about-team .team-row:nth-child(2) .team-row__bar span { width: 41.7%; background: #1FA9BC; }
.page-about .about-team .team-row:nth-child(3) .team-row__bar span { width: 20.8%; background: #147C90; }
.page-about .about-team .team-row:nth-child(4) .team-row__bar span { width: 12.5%; background: #0E5568; }

.page-about .team-row__desc {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-2);
  transition: color 0.2s ease;
}

.page-about .team-row:hover .team-row__desc {
  color: var(--text);
}

.page-about .team-row:hover .team-row__bar span {
  filter: brightness(1.2);
}

/* ---------- 数据块 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  padding: 26px 22px;
  background: var(--ink-900);
}

.page-about .about-stat .stat-value {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.2vw, 44px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-stat .stat-label {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-2);
}

/* ---------- 合作与节奏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .about-split__title {
  margin: 0 0 12px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-split__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-2);
}

.page-about .about-rhythm-list {
  margin: 0;
}

.page-about .about-rhythm-list div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm-list div:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-rhythm-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-rhythm-list dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-2);
}

/* ---------- 支持 ---------- */
.page-about .about-support-list {
  margin: 0 0 30px;
}

.page-about .about-support-list div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-support-list div:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-support-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-support-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-2);
}

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

.page-about .about-actions .btn {
  min-height: 44px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-rhythm-list div,
  .page-about .about-support-list div {
    grid-template-columns: minmax(0, 132px) minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

/* ---------- 大屏 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-bottom: 72px;
  }

  .page-about .about-block {
    padding-block: 88px;
  }

  .page-about .about-block--last {
    padding-bottom: 112px;
  }

  .page-about .about-block__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-block__index {
    font-size: 30px;
    font-weight: 600;
    letter-spacing: 0.02em;
    padding-top: 14px;
    border-top: 1px solid var(--cyan);
  }

  .page-about .tl-node {
    padding-left: 34px;
    padding-bottom: 64px;
  }

  .page-about .about-panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.8fr);
    gap: 40px;
    align-items: center;
    padding: 38px 34px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .about-prose p {
    font-size: 16.5px;
  }
}

/* ---------- 超宽屏 ---------- */
@media (min-width: 1180px) {
  .page-about .about-hero__lede {
    max-width: 52ch;
  }

  .page-about .about-panel__list {
    gap: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node::before,
  .page-about .tl-node__year,
  .page-about .team-row__desc,
  .page-about .team-row__bar span {
    transition: none;
  }
}