.page-about {
  --about-gap: 20px;
  --about-pad-y: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  color: var(--text);
}

.page-about .about-hero__lede {
  max-width: 46ch;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

/* ---------- 视角来源 ---------- */
.page-about .about-origin__title {
  margin-top: 10px;
  max-width: 22ch;
}

.page-about .about-origin__intro {
  margin-top: 18px;
  max-width: 58ch;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.page-about .about-cols {
  display: grid;
  gap: var(--about-gap);
  margin-top: 40px;
}

.page-about .about-col {
  padding: 26px 22px 28px;
  background: var(--ink-2);
}

.page-about .about-col__idx {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
  margin: 0 0 14px;
}

.page-about .about-col__title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 10px;
  color: var(--text);
}

.page-about .about-col__text {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

/* ---------- 更新准则 ---------- */
.page-about .about-upkeep {
  padding-top: var(--about-pad-y);
}

.page-about .about-upkeep__grid {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .about-upkeep__title {
  margin-top: 10px;
}

.page-about .about-upkeep__copy p {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 16.5px;
  line-height: 1.85;
}

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

.page-about .about-upkeep__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-timeline {
  list-style: none;
  margin: 52px 0 0;
  padding: 0 0 0 24px;
  border-left: 2px solid var(--line);
  display: grid;
  gap: 32px;
}

.page-about .about-timeline__item {
  position: relative;
  padding-right: 4px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--orange);
  transition: background .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--orange);
  transform: scale(1.15);
}

.page-about .about-timeline__when {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--teal);
}

.page-about .about-timeline__title {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-timeline__desc {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience__title {
  margin-top: 10px;
}

.page-about .about-audience__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: 36px;
}

.page-about .about-audience__card {
  padding: 24px 22px 26px;
  background: var(--ink-2);
}

.page-about .about-audience__name {
  margin: 16px 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-audience__card p {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-partner {
  display: grid;
  gap: 28px;
  margin-top: 52px;
  align-items: center;
}

.page-about .about-partner__title {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-partner__copy p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
  max-width: 56ch;
}

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

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

.page-about .about-partner__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

/* ---------- 内容档案 ---------- */
.page-about .about-archive__title {
  margin-top: 10px;
}

.page-about .about-archive__intro {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .about-stats {
  display: grid;
  gap: 18px;
  margin-top: 42px;
}

.page-about .about-stat {
  padding: 24px 20px 22px;
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(19, 42, 74, .55), rgba(11, 30, 58, 0));
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(38px, 7vw, 58px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .about-stat__num small {
  font-size: .34em;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--teal);
  margin-left: 4px;
}

.page-about .about-stat__label {
  margin: 12px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-stat__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--faint);
}

.page-about .about-archive__links {
  display: grid;
  gap: 12px;
  margin-top: 42px;
}

.page-about .about-archive__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ink-2);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 15.5px;
  transition: border-color .25s var(--ease), transform .25s var(--ease), color .25s var(--ease);
}

.page-about .about-archive__link:hover,
.page-about .about-archive__link:focus-visible {
  border-color: var(--blue);
  color: var(--text);
  transform: translateX(4px);
}

.page-about .about-archive__link-arrow {
  color: var(--teal);
  font-size: 16px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(64px, 10vw, 120px);
}

.page-about .about-next__inner {
  padding: clamp(32px, 5vw, 56px) clamp(22px, 4vw, 52px);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(255, 107, 53, .16), transparent 58%),
    radial-gradient(100% 120% at 92% 100%, rgba(0, 201, 167, .14), transparent 60%),
    var(--ink-2);
}

.page-about .about-next__title {
  margin: 12px 0 14px;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 54ch;
  color: var(--muted);
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-archive__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
  }

  .page-about .about-archive__link-arrow {
    align-self: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-gap: 24px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 56px;
  }

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

  .page-about .about-col:nth-child(2) {
    margin-top: 32px;
  }

  .page-about .about-col:nth-child(3) {
    margin-top: 64px;
  }

  .page-about .about-upkeep__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
  }

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

  .page-about .about-audience__card:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-audience__card:nth-child(3) {
    margin-top: 60px;
  }

  .page-about .about-partner {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: 52px;
  }

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

@media (min-width: 1200px) {
  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
    border-left: 0;
    border-top: 2px solid var(--line);
    padding: 34px 0 0;
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -43px;
  }

  .page-about .about-timeline__item:hover::before,
  .page-about .about-timeline__item:focus-within::before {
    transform: scale(1.15);
  }

  .page-about .about-timeline__desc {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-archive__link {
    transition: none;
  }
}