.page-about {
  --pa-tl-year: 132px;
  --pa-tl-gap: 40px;
  background:
    radial-gradient(1100px 520px at 80% -12%, rgba(34, 240, 192, .13), transparent 62%),
    radial-gradient(900px 440px at 4% 4%, rgba(126, 107, 255, .11), transparent 60%),
    var(--night-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(20px, 4.5vw, 44px) clamp(40px, 7vw, 92px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--f-head);
  font-weight: 800;
  font-size: clamp(1.95rem, 5.4vw, 3.35rem);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--mist-100);
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 46ch;
  color: var(--mist-300);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 36px);
  background: var(--line-500);
  border: 1px solid var(--line-500);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: clamp(14px, 2.4vw, 20px);
  background: var(--night-800);
}

.page-about .about-stat__label {
  flex: 1 0 100%;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist-300);
}

.page-about .about-stat__value {
  font-family: var(--f-num);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 38px);
  line-height: 1;
  color: var(--teal-400);
}

.page-about .about-stat--warm .about-stat__value {
  color: var(--orange-400);
}

.page-about .about-stat__unit {
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-500);
  box-shadow: var(--sh-2);
}

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

/* ---------- 通用段落带 ---------- */
.page-about .about-band {
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .about-band--deep {
  background: var(--night-800);
  border-block: 1px solid var(--line-500);
}

.page-about .about-band--night {
  background: var(--night-900);
}

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

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 30px;
  border-left: 1px solid var(--line-500);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--night-900);
  border: 2px solid var(--teal-400);
  box-shadow: var(--glow-teal);
}

.page-about .timeline__item:nth-child(4)::before {
  border-color: var(--orange-400);
  box-shadow: 0 0 22px -6px rgba(255, 138, 60, .7);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--f-num);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.2rem);
  line-height: 1;
  color: var(--mist-100);
  opacity: .92;
}

.page-about .timeline__status {
  display: inline-block;
  margin-top: 12px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .timeline__item:hover .timeline__status,
.page-about .timeline__item:focus-within .timeline__status {
  transform: translateY(-2px);
  box-shadow: var(--glow-teal);
}

.page-about .timeline__title {
  margin: 12px 0 0;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  line-height: 1.35;
  color: var(--mist-100);
}

.page-about .timeline__text {
  margin: 10px 0 0;
  max-width: 58ch;
  color: var(--mist-300);
  line-height: 1.75;
}

/* ---------- 方法 ---------- */
.page-about .about-method {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-method__diagram {
  padding: clamp(18px, 3vw, 28px);
  background: var(--night-700);
  border: 1px solid var(--line-500);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-1);
}

.page-about .duoline {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .duoline__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .duoline__legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .duoline__legend-item::before {
  content: "";
  flex: none;
  width: 18px;
  height: 2px;
  border-radius: 2px;
}

.page-about .duoline__legend-item--teal::before {
  background: var(--teal-400);
  box-shadow: var(--glow-teal);
}

.page-about .duoline__legend-item--violet::before {
  background: repeating-linear-gradient(90deg, var(--violet-400) 0 5px, transparent 5px 9px);
}

.page-about .about-method__title {
  margin: 12px 0 0;
  font-family: var(--f-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.2;
  color: var(--mist-100);
}

.page-about .about-method__text {
  margin: 16px 0 0;
  max-width: 58ch;
  color: var(--mist-300);
  line-height: 1.75;
}

.page-about .about-method__acc {
  margin-top: 14px;
  border-top: 1px solid var(--line-500);
}

.page-about .about-method__acc .accordion__title {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  color: var(--mist-100);
}

.page-about .about-method__acc .accordion__body p {
  margin: 0 0 16px;
  color: var(--mist-300);
  line-height: 1.75;
}

.page-about .about-method__figure {
  margin: clamp(30px, 5vw, 56px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-500);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: center;
}

.page-about .about-team__title {
  margin: 12px 0 0;
  font-family: var(--f-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.2;
  color: var(--mist-100);
}

.page-about .about-team__text {
  margin: 16px 0 0;
  max-width: 58ch;
  color: var(--mist-300);
  line-height: 1.75;
}

.page-about .about-team__numbers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 4vw, 32px);
  background: var(--line-500);
  border: 1px solid var(--line-500);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-figure {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: 16px 18px;
  background: var(--night-700);
}

.page-about .about-figure__value {
  font-family: var(--f-num);
  font-weight: 700;
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1;
  color: var(--teal-400);
}

.page-about .about-figure__unit {
  font-size: 13px;
  color: var(--mist-300);
}

.page-about .about-figure__label {
  flex: 1 0 100%;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist-300);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-500);
  box-shadow: var(--sh-1);
}

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

/* ---------- 合作与认可 ---------- */
.page-about .about-credit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(28px, 4.5vw, 48px);
}

.page-about .about-credit__sub {
  margin: 0 0 16px;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .02em;
  color: var(--mist-100);
}

.page-about .credit-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .award {
  flex: 0 1 auto;
  max-width: 100%;
  border: 1px solid var(--line-500);
  border-radius: 999px;
  background: var(--night-800);
  transition: border-radius .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .award[open] {
  border-radius: var(--r-md);
  border-color: rgba(34, 240, 192, .45);
  background: var(--night-700);
}

.page-about .award--warm[open] {
  border-color: rgba(255, 138, 60, .5);
}

.page-about .award__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--mist-100);
}

.page-about .award__summary::-webkit-details-marker {
  display: none;
}

.page-about .award__summary::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal-400);
  box-shadow: var(--glow-teal);
}

.page-about .award--warm .award__summary::before {
  background: var(--orange-400);
  box-shadow: 0 0 20px -6px rgba(255, 138, 60, .8);
}

.page-about .award__body {
  margin: 0;
  padding: 2px 18px 16px;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-300);
}

/* ---------- 往前看 ---------- */
.page-about .about-next__title {
  margin: 12px 0 0;
  font-family: var(--f-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  line-height: 1.2;
  color: var(--mist-100);
}

.page-about .about-next__list {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 28px);
}

.page-about .about-next__item {
  position: relative;
  padding: 20px 20px 22px 20px;
  border: 1px solid var(--line-500);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(16, 27, 54, .92), rgba(10, 18, 38, .92));
}

.page-about .about-next__index {
  display: block;
  font-family: var(--f-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--teal-400);
}

.page-about .about-next__item-title {
  margin: 10px 0 0;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  line-height: 1.4;
  color: var(--mist-100);
}

.page-about .about-next__item-text {
  margin: 10px 0 0;
  color: var(--mist-300);
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 60px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line-500);
  border-radius: var(--r-lg);
  background:
    radial-gradient(620px 260px at 12% 0%, rgba(34, 240, 192, .14), transparent 68%),
    var(--night-700);
  box-shadow: var(--sh-1);
}

.page-about .about-cta__line {
  margin: 0;
  font-family: var(--f-head);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  line-height: 1.4;
  color: var(--mist-100);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta__note {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-300);
}

.page-about .about-cta__note .link-arrow {
  color: var(--orange-400);
}

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .82fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-hero__figure {
    align-self: stretch;
  }

  .page-about .timeline {
    padding-left: 0;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: calc(var(--pa-tl-year) + var(--pa-tl-gap) / 2);
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, var(--teal-400) 0%, var(--line-500) 55%, rgba(30, 43, 77, 0) 100%);
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: var(--pa-tl-year) minmax(0, 1fr);
    column-gap: var(--pa-tl-gap);
    padding-left: 0;
    border-left: 0;
  }

  .page-about .timeline__item::before {
    left: calc(var(--pa-tl-year) + var(--pa-tl-gap) / 2 - 5px);
    top: 10px;
  }

  .page-about .timeline__year {
    grid-column: 1;
    grid-row: 1 / span 3;
    text-align: right;
  }

  .page-about .timeline__status,
  .page-about .timeline__title,
  .page-about .timeline__text {
    grid-column: 2;
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: clamp(36px, 5vw, 68px);
  }

  .page-about .about-method__diagram {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__status,
  .page-about .award {
    transition: none;
  }

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

  .page-about .about-method__diagram {
    position: static;
  }
}