.page-about {
  background: var(--bone);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3,
.page-about p,
.page-about dl,
.page-about dd,
.page-about figure,
.page-about ol,
.page-about ul {
  margin: 0;
}

.page-about ol,
.page-about ul {
  padding: 0;
  list-style: none;
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding: calc(var(--header-h) + 30px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(95, 183, 220, 0.16) 0%, rgba(95, 183, 220, 0) 58%),
    radial-gradient(90% 80% at 4% 92%, rgba(178, 90, 56, 0.13) 0%, rgba(178, 90, 56, 0) 62%);
}

.about-hero__inner {
  display: grid;
  gap: 18px;
}

.about-hero__rail {
  display: none;
}

.about-hero__crumbs {
  margin-bottom: 18px;
}

.about-hero__title {
  font-size: clamp(34px, 8.4vw, 66px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink-deep);
  margin-top: 10px;
}

.about-hero__lede {
  margin-top: 18px;
  max-width: 62ch;
}

.about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.about-facts__item {
  background: var(--bone-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 14px 16px;
}

.about-facts__key {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rock);
  margin-bottom: 8px;
}

.about-facts__val {
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink-deep);
}

.about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.about-index__link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  background: rgba(244, 241, 230, 0.7);
  transition: border-color 0.24s var(--ease), color 0.24s var(--ease), background 0.24s var(--ease);
}

.about-index__link:hover,
.about-index__link:focus-visible {
  border-color: var(--electric);
  color: var(--electric);
  background: var(--bone-raised);
}

/* ---------- 通用章节说明 ---------- */
.about-head {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.about-head__hint {
  margin-top: 12px;
  font-size: 14px;
  color: var(--rock);
  letter-spacing: 0.02em;
}

.about-para {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 66ch;
}

.about-para + .about-para {
  margin-top: 14px;
}

/* ---------- 时间轴 ---------- */
.about-timeline {
  border-top: 1px solid var(--line);
}

.about-timeline__layout {
  display: grid;
  gap: 28px;
}

.about-tl {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 16px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--rock) transparent;
  -webkit-overflow-scrolling: touch;
}

.about-tl__list {
  position: relative;
  display: flex;
  gap: 18px;
  width: max-content;
  padding-right: 4px;
}

.about-tl__list::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--spring) 0%, var(--summer) 26%, var(--autumn) 52%, var(--winter) 76%, var(--moss) 100%);
}

.about-tl__item {
  position: relative;
  flex: 0 0 250px;
  padding: 34px 18px 18px;
  background: var(--bone-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  scroll-snap-align: start;
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.about-tl__item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 3px solid var(--bone);
  background: var(--rock);
}

.about-tl__item--spring::after { background: var(--spring); }
.about-tl__item--summer::after { background: var(--summer); }
.about-tl__item--autumn::after { background: var(--autumn); }
.about-tl__item--winter::after { background: var(--winter); }
.about-tl__item--moss::after { background: var(--moss); }

.about-tl__item:hover,
.about-tl__item:focus-within,
.about-tl__item:focus {
  transform: translateY(-6px);
  box-shadow: var(--shadow-1);
  outline: none;
}

.about-tl__year {
  font-size: 30px;
  font-weight: 700;
  color: var(--ink-deep);
  letter-spacing: -0.01em;
}

.about-tl__title {
  margin-top: 8px;
  font-size: 19px;
  font-weight: 800;
  color: var(--ink);
}

.about-tl__text {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.about-tl__pop {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--clay);
}

.about-timeline__media {
  margin: 0;
}

/* ---------- 数据来源 ---------- */
.about-data {
  border-top: 1px solid var(--line);
}

.about-data__grid {
  align-items: start;
  gap: 30px;
}

.about-flow {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  counter-reset: af;
}

.about-flow__item {
  position: relative;
  padding: 18px 18px 18px 66px;
  background: var(--bone-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.about-flow__item::before {
  counter-increment: af;
  content: "0" counter(af);
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--electric);
  letter-spacing: -0.02em;
}

.about-flow__title {
  font-size: 17px;
  font-weight: 800;
  color: var(--ink-deep);
}

.about-flow__text {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

.about-data__media {
  margin: 0;
}

/* ---------- 团队 ---------- */
.about-team {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(124, 154, 78, 0.08) 0%, rgba(244, 241, 230, 0) 46%);
}

.about-team__grid {
  display: grid;
  gap: 18px;
}

.about-team__card {
  background: var(--bone-raised);
  border: 1px solid var(--line);
  border-left: 6px solid var(--rock);
  border-radius: var(--radius-l);
  padding: 24px 22px;
}

.about-team__card--a { border-left-color: var(--spring); }
.about-team__card--b { border-left-color: var(--summer); }
.about-team__card--c { border-left-color: var(--winter); }

.about-team__num {
  font-size: clamp(42px, 9vw, 62px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink-deep);
}

.about-team__name {
  margin-top: 12px;
  font-size: 20px;
  font-weight: 800;
  color: var(--ink);
}

.about-team__text {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--rock);
}

/* ---------- 本地服务 ---------- */
.about-local {
  border-top: 1px solid var(--line);
}

.about-local__grid {
  align-items: start;
  gap: 30px;
}

.about-local__media {
  margin: 0;
}

.about-local__list {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.about-local__list li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink);
}

.about-local__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--clay);
}

.about-contact {
  margin-top: 26px;
  padding: 8px 20px;
  border-radius: var(--radius-l);
  background: var(--ink-deep);
  background-image:
    repeating-linear-gradient(90deg, rgba(244, 241, 230, 0.06) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(0deg, rgba(244, 241, 230, 0.05) 0 1px, transparent 1px 22px);
  color: var(--bone);
}

.about-contact__row {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-light);
}

.about-contact__row:last-child {
  border-bottom: 0;
}

.about-contact__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(244, 241, 230, 0.66);
}

.about-contact__val {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--bone);
  text-decoration: none;
  word-break: break-word;
}

a.about-contact__val:hover,
a.about-contact__val:focus-visible {
  color: var(--winter);
  text-decoration: underline;
}

/* ---------- 合作生态 ---------- */
.about-partners {
  border-top: 1px solid var(--line);
}

.about-partners__list {
  display: grid;
  gap: 16px;
}

.about-partners__item {
  position: relative;
  background: var(--bone-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 22px 20px;
  overflow: hidden;
}

.about-partners__item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--rock);
}

.about-partners__item--spring::before { background: var(--spring); }
.about-partners__item--autumn::before { background: var(--autumn); }
.about-partners__item--winter::before { background: var(--winter); }

.about-partners__name {
  font-size: 18px;
  font-weight: 800;
  color: var(--ink-deep);
}

.about-partners__text {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--rock);
}

/* ---------- 收束 ---------- */
.about-next {
  border-top: 1px solid var(--line);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.about-next__panel {
  border-radius: var(--radius-l);
  background: var(--ink-deep);
  color: var(--bone);
  padding: clamp(26px, 5vw, 50px);
}

.about-next__eyebrow {
  color: var(--winter);
}

.about-next__title {
  margin-top: 14px;
  font-size: clamp(24px, 4.6vw, 38px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.about-next__text {
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 60ch;
  color: rgba(244, 241, 230, 0.78);
}

.about-next__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: 26px;
}

.about-next__link {
  font-size: 14px;
  color: var(--winter);
  text-decoration: none;
  border-bottom: 1px solid rgba(95, 183, 220, 0.5);
  padding-bottom: 2px;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.about-next__link:hover,
.about-next__link:focus-visible {
  color: var(--bone);
  border-color: var(--bone);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 700px) {
  .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .about-hero__inner {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 34px;
  }

  .about-hero__rail {
    display: flex;
    justify-content: center;
    padding-top: 6px;
  }

  .about-hero__railtext {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.24em;
    color: var(--rock);
    white-space: nowrap;
  }

  .about-tl__item {
    flex: 0 0 268px;
  }

  .about-tl__pop {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.32s var(--ease), opacity 0.26s var(--ease), margin-top 0.32s var(--ease), padding-top 0.32s var(--ease);
  }

  .about-tl__item:hover .about-tl__pop,
  .about-tl__item:focus-within .about-tl__pop,
  .about-tl__item:focus .about-tl__pop {
    max-height: 180px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--line);
  }
}

@media (min-width: 1000px) {
  .about-timeline__layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }

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

  .about-team__card--b {
    margin-top: 44px;
  }

  .about-team__card--c {
    margin-top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-index__link,
  .page-about .about-next__link,
  .page-about .about-tl__pop {
    transition: none;
  }

  .page-about .about-tl__item:hover,
  .page-about .about-tl__item:focus-within,
  .page-about .about-tl__item:focus {
    transform: none;
  }
}