.page-about {
  --about-max: 64ch;
  --about-node: 34px;
  --about-rail: 17px;
  --about-pad: 48px;
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(22px, 4vw, 40px);
  padding-bottom: clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .hero-copy > * + * {
  margin-top: 16px;
}

.page-about .hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.6vw, 45px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--green);
  margin: 0;
}

.page-about .hero-copy .lede {
  color: var(--ink);
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  max-width: var(--about-max);
}

.page-about .hero-note {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  max-width: var(--about-max);
  padding-left: 14px;
  border-left: 2px solid var(--copper-light);
}

.page-about .hero-figure {
  border: 1px solid var(--line);
  background: var(--paper);
  box-shadow: var(--shadow-card);
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

/* ---------- 时间轴骨架 ---------- */
.page-about .about-timeline {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-rail);
  top: 10px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--copper) 0%, rgba(180, 134, 59, 0.5) 55%, rgba(180, 134, 59, 0.1) 100%);
}

.page-about .about-stage {
  position: relative;
  padding-left: var(--about-pad);
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .about-stage + .about-stage {
  margin-top: clamp(10px, 2vw, 20px);
}

.page-about .stage-node {
  position: absolute;
  left: var(--about-rail);
  top: clamp(24px, 4vw, 40px);
  transform: translateX(-50%);
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--copper);
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-about .stage-node:hover,
.page-about .stage-node:focus-visible {
  background: var(--green);
  border-color: var(--green);
  color: var(--cream);
}

.page-about .about-stage:target .stage-node {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}

.page-about .stage-kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .stage-body .section-title {
  margin: 0 0 14px;
  color: var(--green);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.3;
}

.page-about .stage-body p {
  max-width: var(--about-max);
  color: var(--ink);
  line-height: 1.85;
}

.page-about .stage-body p + p {
  margin-top: 14px;
}

.page-about .stage-quote {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--copper);
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  max-width: 46ch;
}

/* ---------- 流程三联 ---------- */
.page-about .process-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 20px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .process-card {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-card);
}

.page-about .process-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--copper);
}

.page-about .process-step {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .process-title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--green);
  line-height: 1.35;
}

.page-about .process-card p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .process-toggle.accordion-trigger {
  margin-top: 14px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--green-2);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.page-about .process-toggle.accordion-trigger:hover,
.page-about .process-toggle.accordion-trigger:focus-visible {
  background: var(--green-2);
  border-color: var(--green-2);
  color: var(--cream);
}

.page-about .accordion-panel {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .accordion-panel p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .process-figure {
  margin-top: clamp(22px, 3.5vw, 34px);
  border: 1px solid var(--line-soft);
  background: var(--paper);
}

.page-about .process-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .team-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--copper);
  padding-top: 4px;
  min-width: 34px;
}

.page-about .team-name {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--green);
}

.page-about .team-list p {
  margin: 0;
  max-width: var(--about-max);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .team-list + p {
  margin-top: 16px;
}

/* ---------- 版本 ---------- */
.page-about .version-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(18px, 3vw, 26px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .version-card {
  background: var(--paper);
  padding: 20px 18px;
}

.page-about .version-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--green-2);
  border: 1px solid var(--line);
  padding: 3px 9px;
}

.page-about .version-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--green);
  line-height: 1.4;
}

.page-about .version-card p {
  margin: 0;
  max-width: none;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .version-grid + p {
  margin-top: 18px;
}

/* ---------- 城市 ---------- */
.page-about .city-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.5vw, 34px);
  align-items: start;
}

.page-about .city-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
  padding: 0;
}

.page-about .city-list li {
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--green);
}

.page-about .city-figure {
  border: 1px solid var(--line-soft);
  background: var(--green);
  box-shadow: var(--shadow-card);
}

.page-about .city-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .city-figure .media-caption {
  padding: 10px 14px;
  color: var(--copper-light);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm-list {
  list-style: none;
  margin: clamp(16px, 3vw, 24px) 0 0;
  padding: 0;
  max-width: var(--about-max);
}

.page-about .rhythm-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .rhythm-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 13px;
  height: 1px;
  background: var(--copper);
}

.page-about .rhythm-list + p {
  margin-top: 16px;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 52px);
  padding: clamp(22px, 3.5vw, 36px);
  background: var(--green);
  color: var(--cream);
  display: grid;
  gap: 20px;
}

.page-about .about-cta .sub-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  color: var(--cream);
  line-height: 1.35;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 241, 228, 0.82);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
}

.page-about .about-cta .btn {
  background: var(--copper);
  border-color: var(--copper);
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-cta .btn:hover,
.page-about .about-cta .btn:focus-visible {
  background: var(--copper-light);
  border-color: var(--copper-light);
}

.page-about .about-cta .btn-ghost {
  color: var(--cream);
  border-color: rgba(217, 184, 118, 0.6);
  background: transparent;
}

.page-about .about-cta .btn-ghost:hover,
.page-about .about-cta .btn-ghost:focus-visible {
  border-color: var(--copper-light);
  color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 760px) {
  .page-about .process-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about {
    --about-node: 40px;
    --about-rail: 27px;
    --about-pad: 84px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .city-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
  }
}