.page-about {
  --about-pad: clamp(44px, 7vw, 84px);
  position: relative;
  padding-bottom: clamp(48px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 48px) 0 clamp(32px, 6vw, 62px);
  border-bottom: 1px solid var(--edge-soft);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(29px, 5.6vw, 58px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--stardust);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 36em;
}

.page-about .about-hero__arc {
  position: absolute;
  right: -22%;
  top: -46%;
  width: min(720px, 96vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(124, 77, 255, 0.26);
  box-shadow: inset 0 0 130px rgba(53, 242, 208, 0.07);
  pointer-events: none;
}

.page-about .about-facts {
  margin: clamp(24px, 4vw, 40px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge-soft);
  border: 1px solid var(--edge-soft);
}

.page-about .about-facts__item {
  background: rgba(21, 11, 58, 0.74);
  padding: 15px 16px 17px;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--amber);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
  border-bottom: 1px solid var(--edge-soft);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .about-section .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: start;
  margin: 0 0 clamp(24px, 4vw, 42px);
}

.page-about .about-section .section-no {
  font-family: var(--font-editorial);
  font-size: clamp(32px, 5.4vw, 54px);
  line-height: 1;
  color: var(--violet);
}

.page-about .about-section .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.2vw, 32px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--stardust);
}

.page-about .about-lead {
  grid-column: 2;
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-note {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-link {
  display: inline-block;
  margin-right: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.34);
  padding-bottom: 2px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--neon);
  color: var(--stardust);
}

/* ---------- 01 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
  display: grid;
  gap: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon), rgba(124, 77, 255, 0.55) 58%, rgba(43, 34, 112, 0.2));
}

.page-about .timeline__node {
  position: relative;
}

.page-about .timeline__dot {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(53, 242, 208, 0.14), 0 0 14px rgba(53, 242, 208, 0.5);
}

.page-about .timeline__stage {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--neon);
  border: 1px solid rgba(53, 242, 208, 0.36);
  border-radius: 999px;
  padding: 3px 10px;
}

.page-about .timeline__text {
  margin: 10px 0 0;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
}

/* ---------- 02 收敛 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-split__text p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

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

.page-about .entry-cards {
  margin: clamp(28px, 4vw, 46px) 0 0;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .entry-card {
  padding: 18px 18px 20px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .entry-card:hover,
.page-about .entry-card:focus-within {
  border-color: rgba(53, 242, 208, 0.45);
}

.page-about .entry-card__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--stardust);
}

.page-about .entry-card__meta {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .entry-card__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 03 服务地区 ---------- */
.page-about .region-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .region-globe {
  position: relative;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--edge);
  overflow: hidden;
  background:
    radial-gradient(circle at 34% 46%, rgba(53, 242, 208, 0.2), transparent 34%),
    radial-gradient(circle, rgba(216, 222, 245, 0.2) 1.4px, transparent 1.5px) 0 0 / 20px 20px,
    linear-gradient(160deg, rgba(30, 18, 80, 0.92), rgba(10, 6, 32, 0.96));
}

.page-about .region-globe::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 34% 46%, transparent 34%, rgba(10, 6, 32, 0.74) 80%);
  pointer-events: none;
}

.page-about .region-globe__pin {
  position: absolute;
  left: 34%;
  top: 46%;
  width: 10px;
  height: 10px;
  margin: -5px 0 0 -5px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 6px rgba(53, 242, 208, 0.12), 0 0 22px rgba(53, 242, 208, 0.65);
  z-index: 1;
}

.page-about .region-globe__label {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .about-region__panel {
  padding: 22px 20px 24px;
}

.page-about .meta-list {
  margin: 12px 0 0;
  display: grid;
  gap: 0;
}

.page-about .meta-list__row {
  display: grid;
  grid-template-columns: minmax(72px, 84px) minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--edge-soft);
}

.page-about .meta-list__row:last-child {
  border-bottom: 0;
}

.page-about .meta-list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
  padding-top: 3px;
}

.page-about .meta-list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--silver);
  word-break: break-word;
}

/* ---------- 04 维护 ---------- */
.page-about .upkeep-grid {
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .duty-card {
  border: 1px solid var(--edge);
  background: rgba(21, 11, 58, 0.78);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .duty-card + .duty-card {
  margin-top: -1px;
}

.page-about .duty-card:hover,
.page-about .duty-card:focus-within {
  border-color: rgba(53, 242, 208, 0.42);
  box-shadow: 5px 5px 0 rgba(53, 242, 208, 0.1);
}

.page-about .duty-card__head {
  position: relative;
  display: block;
  padding: 15px 44px 15px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--stardust);
}

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

.page-about .duty-card__mark {
  position: absolute;
  right: 20px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -6px;
  border-right: 1px solid var(--neon);
  border-bottom: 1px solid var(--neon);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.page-about .duty-card[open] .duty-card__mark {
  margin-top: -3px;
  transform: rotate(-135deg);
}

.page-about .duty-card__body {
  margin: 0;
  padding: 0 18px 18px;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .upkeep-foot {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--violet);
}

.page-about .upkeep-foot p {
  margin: 0 0 10px;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

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

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

@media (min-width: 860px) {
  .page-about .entry-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 46px;
  }

  .page-about .region-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 38px;
    align-items: start;
  }

  .page-about .upkeep-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .duty-stack > .duty-card:nth-child(2) {
    margin-left: 16px;
  }

  .page-about .duty-stack > .duty-card:nth-child(3) {
    margin-left: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 22px;
    padding: 42px 0 0;
  }

  .page-about .timeline::before {
    left: 6px;
    right: 6px;
    top: 13px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--neon), rgba(124, 77, 255, 0.55) 62%, rgba(43, 34, 112, 0.24));
  }

  .page-about .timeline__node {
    padding-right: 8px;
  }

  .page-about .timeline__dot {
    left: 0;
    top: -33px;
  }

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

@media (min-width: 1100px) {
  .page-about .about-section .section-head {
    gap: 4px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .duty-card,
  .page-about .duty-card__mark,
  .page-about .about-link,
  .page-about .entry-card {
    transition: none;
  }

  .page-about .duty-card__mark {
    transition: none;
  }
}