.page-about {
  --about-rail-width: 64px;
  color: var(--color-text);
  background: var(--color-ink);
}

.page-about .about-context {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  padding-bottom: 8px;
}

/* ===== 首屏框景 ===== */
.page-about .about-hero {
  padding-top: 16px;
}
.page-about .about-hero__frame {
  background:
    radial-gradient(circle at 85% 15%, rgba(28, 78, 128, 0.35), transparent 30%),
    linear-gradient(135deg, rgba(16, 48, 79, 0.55), rgba(10, 22, 40, 0.9));
  border-radius: 4px;
}
.page-about .about-hero__inner {
  display: grid;
  gap: 24px;
  padding: 32px 24px;
}
.page-about .about-hero__rail {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-silver);
  font-size: 13px;
}
.page-about .about-hero__year {
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 0.12em;
  color: var(--color-gold-light);
}
.page-about .about-hero__main {
  display: grid;
  gap: 16px;
  justify-items: start;
}
.page-about .about-hero__main h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.18;
  color: var(--color-text-bright);
}
.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  color: var(--color-text);
  line-height: 1.7;
}
.page-about .about-hero__index {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(201, 162, 39, 0.25);
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-gold);
}
.page-about .about-hero__index-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
}

/* ===== 品牌定位 ===== */
.page-about .about-positioning {
  padding-top: 64px;
  padding-bottom: 48px;
}
.page-about .about-positioning__copy {
  display: grid;
  gap: 14px;
  align-content: start;
}
.page-about .about-positioning__copy h2 {
  margin: 0;
  font-size: 26px;
  color: var(--color-text-bright);
}
.page-about .about-positioning__copy .prose p {
  margin: 0 0 14px;
  line-height: 1.7;
}
.page-about .about-keyword-note {
  margin-top: 12px;
  border: 1px solid rgba(201, 162, 39, 0.3);
  border-radius: 12px;
  background: rgba(16, 48, 79, 0.3);
}
.page-about .about-keyword-note summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--color-text-bright);
}
.page-about .about-keyword-note summary::-webkit-details-marker {
  display: none;
}
.page-about .about-keyword-note summary::before {
  content: "+";
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  font-size: 16px;
  transition: transform 0.3s var(--ease-out);
}
.page-about .about-keyword-note[open] summary::before {
  transform: rotate(45deg);
}
.page-about .about-keyword-note p {
  margin: 0;
  padding: 14px 18px 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-silver);
}
.page-about .about-keyword {
  color: var(--color-gold-light);
  font-weight: 600;
}
.page-about .about-positioning__media {
  margin-top: 8px;
}
.page-about .about-positioning__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
}

/* ===== 发展历程 ===== */
.page-about .about-timeline {
  padding-top: 64px;
  padding-bottom: 72px;
  background:
    linear-gradient(180deg, rgba(16, 48, 79, 0.12), rgba(10, 22, 40, 0)),
    var(--color-ink);
}
.page-about .about-timeline__wrap {
  display: grid;
  gap: 40px;
}
.page-about .about-timeline__rail-head {
  display: grid;
  gap: 14px;
  position: relative;
}
.page-about .about-timeline__rail h2 {
  margin: 0;
  font-size: 26px;
  color: var(--color-text-bright);
}
.page-about .about-timeline__desc {
  margin: 0;
  max-width: 32em;
  line-height: 1.6;
  color: var(--color-silver);
}
.page-about .about-timeline__halo {
  position: absolute;
  right: 8px;
  top: 0;
  width: 120px;
  height: 120px;
  opacity: 0.7;
}
.page-about .about-timeline__bg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 20px;
  border-radius: 14px;
  opacity: 0.45;
}
.page-about .about-timeline__axis {
  position: relative;
  display: grid;
  gap: 16px;
  align-self: start;
}
.page-about .about-timeline__axis::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--color-gold), transparent);
  opacity: 0.35;
}
.page-about .timeline-card {
  position: relative;
  margin-left: 10px;
  border: 1px solid rgba(126, 150, 176, 0.2);
  border-left: 4px solid var(--color-gold);
  border-radius: 2px 16px 16px 2px;
  background: rgba(16, 48, 79, 0.35);
  transition: background 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}
.page-about .timeline-card[open] {
  background: rgba(28, 78, 128, 0.35);
  border-left-color: var(--color-gold-light);
}
.page-about .timeline-card summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  column-gap: 16px;
  row-gap: 4px;
  align-items: baseline;
  padding: 20px 22px;
}
.page-about .timeline-card summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline-card__marker {
  grid-row: 1 / 3;
  grid-column: 1;
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--color-gold-light);
}
.page-about .timeline-card__phase {
  grid-column: 2;
  grid-row: 1;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--color-silver);
}
.page-about .timeline-card__title {
  grid-column: 2;
  grid-row: 2;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-bright);
}
.page-about .timeline-card[open] .timeline-card__title {
  color: var(--color-gold-light);
}
.page-about .timeline-card summary::after {
  content: "";
  grid-column: 3;
  grid-row: 1 / 3;
  align-self: center;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-gold);
  border-bottom: 2px solid var(--color-gold);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease-out);
}
.page-about .timeline-card[open] summary::after {
  transform: rotate(225deg);
}
.page-about .timeline-card__body {
  display: grid;
  gap: 12px;
  margin-top: 4px;
  padding: 0 22px 22px;
  border-top: 1px solid rgba(126, 150, 176, 0.15);
}
.page-about .timeline-card__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text);
}
.page-about .timeline-card__body .tag-cluster {
  margin-top: 4px;
}

/* ===== 运营机制 ===== */
.page-about .about-mechanism {
  padding-top: 56px;
  padding-bottom: 56px;
  border-top: 1px solid rgba(201, 162, 39, 0.35);
  border-bottom: 1px solid rgba(201, 162, 39, 0.35);
  background:
    radial-gradient(circle at 18% 28%, rgba(201, 162, 39, 0.1), transparent 30%),
    linear-gradient(135deg, rgba(16, 48, 79, 0.85), rgba(10, 22, 40, 0.95));
}
.page-about .mechanism-head {
  max-width: 42em;
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
}
.page-about .mechanism-head h2 {
  margin: 0;
  font-size: 26px;
  color: var(--color-text-bright);
}
.page-about .mechanism-head p:last-child {
  margin: 0;
  line-height: 1.6;
  color: var(--color-silver);
}
.page-about .mechanism-band {
  display: grid;
  gap: 14px;
}
.page-about .mechanism-card {
  display: grid;
  gap: 8px;
  padding: 26px 24px;
  border: 1px solid rgba(126, 150, 176, 0.2);
  border-top: 3px solid var(--color-gold);
  border-radius: 4px 18px 18px 4px;
  background: rgba(16, 48, 79, 0.35);
}
.page-about .mechanism-card__num {
  font-family: var(--font-serif);
  font-size: 28px;
  line-height: 1;
  color: var(--color-gold);
}
.page-about .mechanism-card h3 {
  margin: 8px 0 0;
  font-size: 18px;
  color: var(--color-text-bright);
}
.page-about .mechanism-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-silver);
}

/* ===== 本地服务特色 ===== */
.page-about .about-local {
  padding-top: 72px;
  padding-bottom: 72px;
}
.page-about .about-local__wrap {
  display: grid;
  gap: 36px;
  align-items: center;
}
.page-about .about-local__content {
  display: grid;
  gap: 14px;
  align-content: start;
}
.page-about .about-local__content h2 {
  margin: 0;
  font-size: 26px;
  color: var(--color-text-bright);
}
.page-about .about-local__content > p {
  margin: 0;
  line-height: 1.7;
  color: var(--color-text);
}
.page-about .about-local__address {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding: 16px 18px;
  border-left: 4px solid var(--color-crimson);
  background: rgba(178, 73, 60, 0.1);
  color: var(--color-text-bright);
}
.page-about .about-local__visual {
  position: relative;
  border: 1px solid rgba(178, 73, 60, 0.35);
  border-radius: 16px;
  overflow: hidden;
  outline: none;
}
.page-about .about-local__layer {
  transition: opacity 0.5s var(--ease-out);
}
.page-about .about-local__layer--hill {
  opacity: 1;
}
.page-about .about-local__layer--plain {
  opacity: 0;
}
.page-about .about-local__visual:hover .about-local__layer--hill,
.page-about .about-local__visual:focus-within .about-local__layer--hill {
  opacity: 0;
}
.page-about .about-local__visual:hover .about-local__layer--plain,
.page-about .about-local__visual:focus-within .about-local__layer--plain {
  opacity: 1;
}
.page-about .about-local__layer img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-local__hint {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 6px 12px;
  border: 1px solid rgba(201, 162, 39, 0.4);
  border-radius: 999px;
  background: rgba(10, 22, 40, 0.7);
  color: var(--color-text-bright);
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* ===== 团队与协作 ===== */
.page-about .about-team {
  padding-top: 16px;
  padding-bottom: 72px;
}
.page-about .about-team__head {
  max-width: 40em;
  display: grid;
  gap: 10px;
}
.page-about .about-team__head h2 {
  margin: 0;
  font-size: 26px;
  color: var(--color-text-bright);
}
.page-about .about-team__head p:last-child {
  margin: 0;
  line-height: 1.6;
  color: var(--color-silver);
}
.page-about .about-team__stats {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}
.page-about .about-stat {
  display: grid;
  gap: 4px;
  padding: 28px 24px;
  border: 1px solid rgba(126, 150, 176, 0.2);
  border-top: 4px solid var(--color-gold);
  border-radius: 4px 18px 18px 4px;
  background: linear-gradient(160deg, rgba(16, 48, 79, 0.6), rgba(10, 22, 40, 0.8));
}
.page-about .about-stat__num {
  font-family: var(--font-serif);
  font-size: 52px;
  line-height: 1;
  color: var(--color-gold-light);
}
.page-about .about-stat__label {
  margin-top: 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-bright);
}
.page-about .about-stat__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-silver);
}
.page-about .about-team__notice {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid rgba(178, 73, 60, 0.25);
  border-radius: 12px;
  background: rgba(178, 73, 60, 0.08);
}
.page-about .about-team__notice p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-silver);
}

/* ===== 继续查阅 ===== */
.page-about .about-onward {
  padding-bottom: 80px;
}
.page-about .about-onward__inner {
  display: grid;
  gap: 24px;
  padding: 36px 24px;
  border-radius: 18px;
  background:
    radial-gradient(circle at 90% 90%, rgba(178, 73, 60, 0.12), transparent 40%),
    var(--color-paper);
}
.page-about .about-onward__main {
  display: grid;
  gap: 12px;
}
.page-about .about-onward__main h2 {
  margin: 0;
  font-size: 26px;
  color: var(--color-ink-soft);
}
.page-about .about-onward__main p:last-child {
  margin: 0;
  line-height: 1.6;
  color: var(--color-blue);
}
.page-about .about-onward__main .overline-label {
  color: var(--color-crimson);
}
.page-about .about-onward__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-onward__inner .btn--outline {
  border-color: rgba(28, 78, 128, 0.5);
  color: var(--color-ink-soft);
}
.page-about .about-onward__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding-top: 16px;
  border-top: 1px solid rgba(28, 78, 128, 0.25);
  font-size: 14px;
  color: var(--color-blue);
}
.page-about .about-onward__legal a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.8);
  transition: border-color 0.3s var(--ease-out);
}
.page-about .about-onward__legal a:hover {
  border-color: var(--color-crimson);
}

/* ===== 桌面端分屏与节奏 ===== */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: var(--about-rail-width) 1fr;
    grid-template-rows: auto auto;
    gap: 28px 36px;
    padding: 56px 56px 48px;
  }
  .page-about .about-hero__rail {
    grid-row: 1 / 3;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding-top: 4px;
  }
  .page-about .about-hero__year {
    font-size: 24px;
  }
  .page-about .about-hero__main h1 {
    font-size: 44px;
  }
  .page-about .about-hero__lead {
    font-size: 18px;
  }
  .page-about .about-hero__index {
    grid-column: 2;
    margin-top: 8px;
  }

  .page-about .about-positioning__media img {
    height: 100%;
    min-height: 320px;
    object-fit: cover;
  }

  .page-about .about-timeline__wrap {
    grid-template-columns: minmax(260px, 0.8fr) 1.4fr;
    gap: 64px;
  }
  .page-about .about-timeline__rail {
    position: sticky;
    top: 120px;
    height: min-content;
  }

  .page-about .mechanism-band {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about .about-local__wrap {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-team__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 48px;
  }

  .page-about .about-onward__inner {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 32px;
    padding: 56px 64px;
  }
  .page-about .about-onward__legal {
    grid-column: 1 / 3;
  }
}