.page-about {
  --about-rail: 250px;
  --about-gap: clamp(1.5rem, 4.5vw, 3.75rem);
  --about-line: 1px solid var(--line-green);
  --about-accent: var(--signal-mint);
  background: var(--bg);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .crumbs {
  padding-top: clamp(1rem, 3vw, 1.75rem);
  padding-bottom: clamp(0.5rem, 2vw, 1rem);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(2rem, 5vw, 3.5rem);
  border-bottom: var(--rule-dash);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(46, 74, 64, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 74, 64, 0.42) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(ellipse 78% 90% at 50% 0%, #000 0%, transparent 74%);
  mask-image: radial-gradient(ellipse 78% 90% at 50% 0%, #000 0%, transparent 74%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  text-align: center;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.15rem;
  color: var(--about-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.page-about .about-hero__kicker::before,
.page-about .about-hero__kicker::after {
  content: "";
  width: clamp(1.5rem, 6vw, 3.5rem);
  height: 1px;
  background: var(--line-green);
}

.page-about .about-hero__title {
  margin: 0 0 1.35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.6vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.page-about .about-hero__title .hl {
  position: relative;
  color: var(--about-accent);
  white-space: nowrap;
}

.page-about .about-hero__title .hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.08em;
  height: 4px;
  background: linear-gradient(90deg, var(--signal-mint), var(--data-cyan) 58%, var(--track-orange));
  opacity: 0.85;
}

.page-about .about-hero__lede {
  max-width: 64ch;
  margin: 0 auto;
  color: var(--ink-dim);
  font-size: clamp(0.95rem, 2.4vw, 1.06rem);
  line-height: 1.82;
  text-align: left;
}

.page-about .about-hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  max-width: 900px;
  margin: clamp(1.75rem, 4.5vw, 2.75rem) auto 0;
  padding: clamp(1.15rem, 3vw, 1.6rem) 0 0;
  border-top: var(--about-line);
  text-align: left;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--line-green);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--about-accent);
  line-height: 1.15;
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
}

/* ---------- 定位与覆盖 ---------- */

.page-about .about-scope__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-scope__rail {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-top: 0.4rem;
}

.page-about .about-scope__note {
  margin: 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--track-orange);
  color: var(--ink-dim);
  font-size: 13px;
  line-height: 1.8;
}

.page-about .about-scope__body h2 {
  margin-top: 0;
}

.page-about .about-scope__facts {
  display: grid;
  gap: 1px;
  margin-top: clamp(1.25rem, 3.5vw, 2rem);
  background: var(--line-green);
  border: var(--about-line);
}

.page-about .about-fact {
  padding: clamp(1rem, 3vw, 1.35rem);
  background: var(--deep-pine);
}

.page-about .about-fact .mono-tag {
  display: inline-block;
  margin-bottom: 0.5rem;
}

.page-about .about-fact p {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* ---------- 查阅清单 ---------- */

.page-about .about-catalog__intro {
  max-width: 60ch;
  margin: 0;
  color: var(--ink-dim);
  line-height: 1.8;
}

.page-about .about-catalog__list {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .catalog-row {
  position: relative;
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.35rem 1rem;
  padding: clamp(1.05rem, 3vw, 1.5rem) 0.5rem clamp(1.05rem, 3vw, 1.5rem) 0.75rem;
  border-bottom: var(--about-line);
  transition: background-color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .catalog-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--signal-mint), var(--data-cyan));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.28s var(--ease);
}

.page-about .catalog-row:hover,
.page-about .catalog-row:focus-within {
  background: rgba(0, 229, 160, 0.045);
  padding-left: 1.35rem;
}

.page-about .catalog-row:hover::before,
.page-about .catalog-row:focus-within::before {
  transform: scaleY(1);
}

.page-about .catalog-row__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--track-orange);
}

.page-about .catalog-row__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3.4vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  transition: color 0.25s var(--ease);
}

.page-about .catalog-row:hover .catalog-row__name {
  color: var(--about-accent);
}

.page-about .catalog-row__desc {
  grid-column: 2;
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.92rem;
  line-height: 1.78;
}

/* ---------- 维护记录 ---------- */

.page-about .about-log__intro {
  max-width: 62ch;
  margin: 0;
  color: var(--ink-dim);
  line-height: 1.8;
}

.page-about .about-log__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

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

.page-about .log-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .log-entry {
  position: relative;
  padding: 0 0 clamp(1.25rem, 3.4vw, 1.9rem) 1.6rem;
  border-left: 1px solid var(--line-green);
}

.page-about .log-entry::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.35rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--line-green);
  transition: background-color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .log-entry:hover::before,
.page-about .log-entry:focus-within::before {
  background: var(--signal-mint);
  border-color: var(--signal-mint);
  transform: scale(1.35);
}

.page-about .log-entry:last-child {
  padding-bottom: 0.2rem;
}

.page-about .log-entry__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--about-accent);
}

.page-about .log-entry__when {
  display: inline-block;
  margin: 0 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
}

.page-about .log-entry__desc {
  margin: 0.4rem 0 0;
  color: var(--ink);
  font-size: 0.92rem;
  line-height: 1.78;
  opacity: 0.82;
  transition: opacity 0.25s var(--ease);
}

.page-about .log-entry:hover .log-entry__desc,
.page-about .log-entry:focus-within .log-entry__desc {
  opacity: 1;
}

.page-about .about-log__more {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  max-width: 68ch;
}

.page-about .about-log__more a {
  color: var(--data-cyan);
}

/* ---------- 团队 ---------- */

.page-about .about-team__intro {
  max-width: 62ch;
  margin: 0;
  color: var(--ink-dim);
  line-height: 1.8;
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

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

.page-about .about-team__body {
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .team-groups {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .team-group {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.85rem;
  padding: 0.7rem 0.85rem;
  border: var(--about-line);
  background: var(--carbon-board);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .team-group:hover {
  border-color: var(--signal-mint);
  transform: translateX(4px);
}

.page-about .team-group__name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
  min-width: 6.5rem;
}

.page-about .team-group__desc {
  color: var(--ink-dim);
  font-size: 0.85rem;
  line-height: 1.6;
}

.page-about .about-team__flow {
  padding-top: clamp(1.1rem, 3vw, 1.6rem);
  border-top: var(--rule-dash);
}

.page-about .about-team__flow .rule-label {
  margin-bottom: 0.9rem;
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .flow-step {
  display: grid;
  gap: 0.2rem;
  color: var(--ink-dim);
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-about .flow-step__n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--data-cyan);
}

/* ---------- 本地合作 ---------- */

.page-about .about-local__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-local__body h2 {
  margin: 0.6rem 0 1rem;
}

.page-about .about-local__body p {
  margin: 0 0 1rem;
  color: var(--ink-dim);
  line-height: 1.82;
}

.page-about .about-local__body a {
  color: var(--data-cyan);
}

.page-about .local-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.75rem;
  margin: clamp(1.25rem, 3.5vw, 1.85rem) 0 0;
  padding: clamp(0.9rem, 3vw, 1.25rem) 0 0;
  border-top: var(--about-line);
}

.page-about .local-stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .local-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 3.2vw, 1.55rem);
  font-weight: 700;
  color: var(--track-orange);
}

.page-about .local-stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
}

.page-about .about-local__aside {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.page-about .local-map {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--line-green);
  border: var(--about-line);
  position: relative;
}

.page-about .local-map__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 0.85rem;
  background: var(--deep-pine);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .local-map__item:hover {
  background: rgba(255, 106, 43, 0.12);
  color: var(--ink);
}

.page-about .local-map__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--line-green);
  transition: background-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .local-map__item:hover .local-map__dot {
  background: var(--track-orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.18);
}

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

/* ---------- 下一步 ---------- */

.page-about .about-next {
  border-top: var(--rule-dash);
  background: linear-gradient(140deg, rgba(0, 229, 160, 0.06), rgba(18, 33, 29, 0.9) 62%);
}

.page-about .about-next__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-next__text h2 {
  margin: 0.55rem 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.2vw, 2.35rem);
  font-weight: 900;
  line-height: 1.18;
}

.page-about .about-next__text p {
  margin: 0;
  max-width: 60ch;
  color: var(--ink-dim);
  line-height: 1.82;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

.page-about .about-next__actions .btn {
  flex: 1 1 12rem;
  justify-content: center;
  text-align: center;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .local-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: center;
  }

  .page-about .about-next__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-next__actions .btn {
    flex: 0 0 auto;
    width: 100%;
  }
}

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

  .page-about .about-scope__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-scope__rail {
    padding-right: 1.5rem;
    border-right: var(--rule-dash);
    min-height: 6rem;
  }

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

  .page-about .catalog-row {
    grid-template-columns: 3rem 12rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: center;
  }

  .page-about .catalog-row__desc {
    grid-column: 3;
  }

  .page-about .about-log__grid {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-log__figure {
    position: sticky;
    top: 2rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 3.75rem);
  }

  .page-about .about-local__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: clamp(2rem, 5vw, 4rem);
  }
}

@media (min-width: 1080px) {
  .page-about .local-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .catalog-row,
  .page-about .log-entry::before,
  .page-about .log-entry__desc,
  .page-about .team-group,
  .page-about .local-map__item,
  .page-about .local-map__dot {
    transition: none;
  }

  .page-about .log-entry:hover::before,
  .page-about .log-entry:focus-within::before {
    transform: none;
  }

  .page-about .team-group:hover {
    transform: none;
  }
}