.page-about {
  --about-max: 1100px;
  --about-pad: clamp(16px, 4.2vw, 40px);
  --about-gap: clamp(20px, 4vw, 36px);
  color: var(--white);
  font-family: var(--font-text);
  font-size: 16px;
  line-height: 1.8;
  background:
    radial-gradient(880px 420px at 92% -6%, rgba(47, 227, 214, 0.10), transparent 62%),
    radial-gradient(720px 420px at 2% 4%, rgba(245, 169, 75, 0.08), transparent 66%);
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--about-pad) clamp(56px, 9vw, 96px);
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(24px, 3.4vw, 36px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 8.6vw, 76px);
  line-height: 1.03;
  letter-spacing: -0.035em;
  margin: 0.28em 0 0.4em;
  max-width: 15ch;
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(22px, 4vw, 32px);
  max-width: 34ch;
  color: var(--muted);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures li {
  background: var(--surface-1);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-figures__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-figures__num small {
  font-size: 0.4em;
  font-weight: 700;
  letter-spacing: 0;
  margin-left: 3px;
  color: var(--cyan);
}

.page-about .about-figures__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-top: clamp(40px, 7vw, 76px);
}

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

.page-about .chapter-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.6vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  margin: 0.22em 0 0.55em;
}

.page-about .chapter-head__desc {
  margin: 0;
  max-width: 38ch;
  color: var(--muted);
  font-size: 15px;
}

.page-about .about-media {
  margin: var(--about-gap) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-1);
  box-shadow: var(--shadow-card);
}

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

.page-about .about-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin-top: clamp(22px, 4vw, 36px);
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .year-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px 10px;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-rail__link {
  position: relative;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-1);
  color: var(--muted);
  text-decoration: none;
  transition: border-color 0.22s ease-out, color 0.22s ease-out, background 0.22s ease-out;
}

.page-about .year-rail__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 227, 214, 0.16);
}

.page-about .year-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--white);
}

.page-about .year-rail__text {
  font-size: 12px;
  white-space: nowrap;
}

.page-about .year-rail__link:hover,
.page-about .year-rail__link:focus-visible {
  border-color: var(--cyan);
  background: var(--surface-2);
  color: var(--white);
}

.page-about .era-list {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .era-card {
  position: relative;
  padding: clamp(18px, 3.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-1);
  box-shadow: 8px 8px 0 -1px var(--surface-2), var(--shadow-card);
  scroll-margin-top: 96px;
}

.page-about .era-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .era-card__year {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(44px, 12vw, 80px);
  line-height: 0.82;
  letter-spacing: -0.045em;
  color: rgba(47, 227, 214, 0.16);
  -webkit-text-stroke: 1.4px rgba(47, 227, 214, 0.55);
}

.page-about .era-card--amber .era-card__year {
  color: rgba(245, 169, 75, 0.16);
  -webkit-text-stroke: 1.4px rgba(245, 169, 75, 0.55);
}

.page-about .era-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 3.2vw, 24px);
  line-height: 1.36;
  letter-spacing: -0.015em;
  margin: 16px 0 8px;
}

.page-about .era-card__body {
  margin: 0 0 14px;
  max-width: 44ch;
  color: var(--muted);
  font-size: 15px;
}

.page-about .era-card__fix {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  color: var(--white);
}

.page-about .era-card__fix-label {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .era-card--amber .era-card__fix-label {
  color: var(--amber);
}

/* ---------- 三条原则 ---------- */
.page-about .principles {
  margin-top: var(--about-gap);
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}

.page-about .principle {
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan-dark);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
}

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

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

.page-about .principle__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .principle h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.6vw, 20px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  margin: 10px 0 8px;
}

.page-about .principle p {
  margin: 0;
  font-size: 14.5px;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team {
  margin-top: var(--about-gap);
  display: grid;
  gap: clamp(20px, 3.6vw, 32px);
  align-items: start;
}

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

.page-about .team-stats {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .team-stats li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-stats__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 32px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  min-width: 2.6ch;
}

.page-about .team-stats__name {
  display: block;
  font-size: 15px;
  color: var(--white);
}

.page-about .team-stats__desc {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .team__note {
  margin: 0;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan-dark);
  background: var(--surface-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  color: var(--white);
}

.page-about .about-media--team {
  margin-top: 0;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-media--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .cities {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .cities li {
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-2);
  font-size: 13px;
  color: var(--white);
}

.page-about .cities li.is-near {
  border-color: rgba(245, 169, 75, 0.6);
  color: var(--amber);
  background: rgba(245, 169, 75, 0.08);
}

.page-about .coverage-note {
  margin: 16px 0 0;
  max-width: 42ch;
  font-size: 14.5px;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--about-gap);
}

.page-about .eco-tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface-1);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--white);
  cursor: default;
  transition: border-color 0.2s ease-out, background 0.2s ease-out;
}

.page-about .eco-tag:hover,
.page-about .eco-tag:focus-visible {
  border-color: var(--cyan);
  background: var(--surface-2);
}

.page-about .eco-tag__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  z-index: 6;
  width: min(238px, 70vw);
  padding: 10px 12px;
  border: 1px solid var(--cyan-dark);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--white);
  font-family: var(--font-text);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0;
  box-shadow: var(--shadow-card);
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out, visibility 0.2s;
}

.page-about .eco-tag:hover .eco-tag__tip,
.page-about .eco-tag:focus-visible .eco-tag__tip,
.page-about .eco-tag:focus-within .eco-tag__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .proof {
  margin-top: clamp(22px, 4vw, 32px);
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}

.page-about .proof__card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
}

.page-about .proof__card--amber {
  border-left-color: var(--amber);
}

.page-about .proof__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 34px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .proof__card--amber .proof__num {
  color: var(--amber);
}

.page-about .proof__card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  margin: 12px 0 6px;
}

.page-about .proof__card p {
  margin: 0;
  font-size: 14.5px;
  color: var(--muted);
}

/* ---------- 接下来一年 ---------- */
.page-about .next-list {
  list-style: none;
  margin: var(--about-gap) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .next-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--surface-1);
  font-size: 14.5px;
  color: var(--muted);
}

.page-about .next-list__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .next-list strong {
  color: var(--white);
  font-weight: 700;
}

/* ---------- 结尾动作 ---------- */
.page-about .about-cta {
  margin-top: clamp(42px, 7vw, 76px);
  padding: clamp(22px, 4.2vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(47, 227, 214, 0.14), rgba(245, 169, 75, 0.12) 68%, transparent 100%),
    var(--surface-1);
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 4vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.025em;
  margin: 0 0 10px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0 16px;
}

.page-about .about-cta__back {
  font-size: 14px;
}

.page-about .about-cta__back a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__back a:hover {
  color: var(--white);
}

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

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

@media (min-width: 860px) {
  .page-about .team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-media--team {
    margin-top: 8px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .year-rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .year-rail::before {
    content: "";
    position: absolute;
    left: 11px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(var(--line-strong), rgba(122, 110, 150, 0.08));
  }

  .page-about .year-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 12px 0 12px 32px;
    border: none;
    border-radius: 0;
    background: transparent;
  }

  .page-about .year-rail__dot {
    position: absolute;
    left: 7px;
    top: 20px;
    width: 9px;
    height: 9px;
  }

  .page-about .year-rail__text {
    font-size: 12.5px;
    color: var(--muted);
  }

  .page-about .year-rail__link:hover .year-rail__text,
  .page-about .year-rail__link:focus-visible .year-rail__text {
    color: var(--white);
  }

  .page-about .era-card:nth-child(odd) {
    margin-right: clamp(16px, 4vw, 44px);
  }

  .page-about .era-card:nth-child(even) {
    margin-left: clamp(16px, 4vw, 44px);
  }

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

  .page-about .principle:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .principle:nth-child(3) {
    margin-top: 40px;
  }

  .page-about .about-hero__lede {
    font-size: 17px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding-top: clamp(40px, 5vw, 64px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-rail__link,
  .page-about .eco-tag,
  .page-about .eco-tag__tip {
    transition: none;
  }

  .page-about .eco-tag__tip {
    transform: none;
  }
}