.page-about {
  background: var(--ink-900);
  color: var(--white);
  padding-block: 104px 88px;
  overflow-wrap: break-word;
}

.page-about .crumbs {
  margin-bottom: 30px;
}

/* ---------- 首屏 ---------- */
.about-hero {
  display: grid;
  gap: 30px;
  padding-bottom: 52px;
  border-bottom: 1px solid var(--line-soft);
}

.about-hero__lead {
  min-width: 0;
}

.about-hero .display-1 {
  margin: 16px 0 18px;
}

.about-hero .lede {
  max-width: 60ch;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.about-hero__side {
  min-width: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.about-facts > div {
  background: var(--ink-800);
  padding: 16px 14px;
}

.about-facts dt {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: 8px;
}

.about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--signal);
}

.about-facts dd span {
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
  margin-left: 4px;
}

/* ---------- 分节通用 ---------- */
.page-about .section {
  padding-block: 44px;
}

.page-about .section__head {
  display: grid;
  gap: 10px;
  align-items: start;
  margin-bottom: 26px;
}

.about-head__note {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
  max-width: 56ch;
}

/* ---------- 01 改版 ---------- */
.about-revamp__body {
  display: grid;
  gap: 16px;
  max-width: 72ch;
}

.about-revamp__body > p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

.about-changes {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.about-changes li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.about-changes li:hover {
  border-color: rgba(0, 255, 157, 0.45);
  background: var(--ink-750);
}

.about-changes__no {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--signal);
  padding-top: 3px;
}

.about-changes li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--white);
}

/* ---------- 02 时间线 ---------- */
.about-timeline__figure {
  margin: 0 0 34px;
}

.timeline {
  display: grid;
  gap: 26px;
}

.timeline__index {
  min-width: 0;
}

.timeline__index-label {
  margin: 0 0 10px;
}

.timeline__index ul {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.timeline__index a {
  display: block;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  padding: 7px 13px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.timeline__index a:hover,
.timeline__index a:focus-visible {
  color: var(--blue);
  border-color: var(--blue);
  background: rgba(30, 144, 255, 0.08);
}

.timeline__nodes {
  position: relative;
  min-width: 0;
}

.timeline__nodes::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), var(--blue) 55%, var(--teal));
  opacity: 0.55;
}

.tl-node {
  position: relative;
  padding-left: 30px;
  margin: 0 0 16px;
}

.tl-node:last-child {
  margin-bottom: 0;
}

.tl-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 3px solid var(--signal);
}

.tl-node--now::before {
  border-color: var(--orange);
}

.tl-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 15px;
  list-style: none;
  cursor: pointer;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.tl-node summary::-webkit-details-marker {
  display: none;
}

.tl-node summary:hover {
  border-color: var(--line-mid);
}

.tl-node[open] summary {
  border-color: rgba(0, 255, 157, 0.5);
  background: var(--ink-750);
}

.tl-node--now[open] summary {
  border-color: rgba(255, 107, 53, 0.55);
}

.tl-node__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--signal);
  flex: none;
}

.tl-node--now .tl-node__year {
  color: var(--orange);
}

.tl-node__title {
  flex: 1;
  min-width: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.tl-node__toggle {
  flex: none;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--muted);
  transition: transform 0.2s ease, color 0.2s ease;
}

.tl-node[open] .tl-node__toggle {
  transform: rotate(135deg);
  color: var(--signal);
}

.tl-node__body {
  margin-top: 8px;
  padding: 15px 16px;
  background: var(--ink-750);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.tl-node__body p {
  margin: 0;
}

.tl-node__body ul {
  margin: 10px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

/* ---------- 03 团队 ---------- */
.about-team__intro {
  display: grid;
  gap: 26px;
  margin-bottom: 26px;
}

.about-team__paper {
  padding: 26px 22px;
  border-radius: var(--radius-lg);
}

.about-team__paper .eyebrow {
  color: var(--brown);
}

.about-team__figure {
  margin: 0;
}

.team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.team-card {
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.team-card:hover {
  border-color: var(--signal);
  background: var(--ink-750);
  transform: translateY(-4px);
}

.team-card__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--blue);
}

.team-card__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.team-card__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.team-card__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--muted);
  opacity: 0.65;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.team-card:hover .team-card__meta {
  opacity: 1;
  color: var(--signal);
}

/* ---------- 04 回访 ---------- */
.about-return__grid {
  display: grid;
  gap: 14px;
}

.return-stat {
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  padding: 22px 18px;
}

.return-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(42px, 9vw, 58px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.return-stat--accent .return-stat__num {
  color: var(--orange);
}

.return-stat__label {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.return-note {
  margin: 0;
  padding: 20px 18px;
  background: var(--ink-750);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.return-note p {
  margin: 0;
}

.return-note p + p {
  margin-top: 10px;
}

/* ---------- 05 渠道 ---------- */
.about-channel__split {
  display: grid;
  gap: 26px;
}

.about-channel__figure {
  margin: 0;
}

.about-channel__text {
  min-width: 0;
}

.about-channel__text > p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.about-channel__text a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 255, 157, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.about-channel__text a:hover {
  color: var(--white);
  border-color: var(--white);
}

.channel-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.channel-list li {
  background: var(--ink-800);
  padding: 13px 15px;
  display: grid;
  gap: 4px;
}

.channel-list__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.channel-list__val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
}

/* ---------- 06 在意的事 ---------- */
.about-care-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.about-care-list li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.about-care-list li:hover {
  border-color: rgba(30, 144, 255, 0.55);
  background: var(--ink-750);
}

.about-care-list__no {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--blue);
  padding-top: 4px;
}

.about-care-list h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.about-care-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.about-cta {
  margin-top: 22px;
  padding: 26px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0, 255, 157, 0.08), rgba(30, 144, 255, 0.1) 55%, rgba(255, 107, 53, 0.08));
  display: grid;
  gap: 16px;
}

.about-cta__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--white);
  max-width: 62ch;
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 图片 ---------- */
.page-about .media-frame img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: inherit;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .about-team__paper {
    padding: 34px 30px;
  }

  .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .channel-list li {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-block: 128px 104px;
  }

  .page-about .section {
    padding-block: 70px;
  }

  .about-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    gap: 54px;
    align-items: start;
    padding-bottom: 68px;
  }

  .about-team__intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: center;
  }

  .about-channel__split {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 44px;
    align-items: center;
  }

  .about-return__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-care-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 30px 28px;
  }

  .about-cta__actions {
    grid-column: 2;
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .timeline {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .timeline__index {
    position: sticky;
    top: 118px;
  }

  .timeline__index ul {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .timeline__index a {
    border-radius: var(--radius-sm);
  }
}

@media (min-width: 1040px) {
  .about-return__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 0.8fr) minmax(0, 1.4fr);
    align-items: stretch;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}