.page-about {
  --about-rule: rgba(255, 255, 255, 0.06);
  position: relative;
  background: var(--ink);
  color: var(--text);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about p {
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  display: grid;
  gap: 20px;
  padding: clamp(28px, 5vw, 64px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-intro h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--head);
  max-width: 14ch;
}

.page-about .about-intro__body {
  display: grid;
  gap: 14px;
}

.page-about .about-intro__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px;
  background: var(--panel);
}

.page-about .about-figures__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .about-figures__v {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 18px rgba(200, 241, 60, 0.22);
}

/* ---------- 章节通用 ---------- */

.page-about .about-evolution,
.page-about .about-crew,
.page-about .about-flow,
.page-about .about-partners,
.page-about .about-local {
  padding: clamp(44px, 6.5vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 18px;
  align-items: start;
  padding-bottom: 18px;
  margin-bottom: clamp(26px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-head__idx {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
  opacity: 0.6;
}

.page-about .about-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 44px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--head);
}

.page-about .about-head p {
  margin: 0;
  font-size: 15px;
}

.page-about .media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-deep);
}

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

.page-about .media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  line-height: 1.6;
}

/* ---------- 演进 ---------- */

.page-about .evo-media {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .stage-switch {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-bottom: 18px;
}

.page-about .stage-switch__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}

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

.page-about .stage-switch__list a {
  display: inline-block;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--text);
  text-decoration: none;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.page-about .stage-switch__list a:hover,
.page-about .stage-switch__list a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

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

.page-about .stage {
  display: grid;
  gap: 6px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .stage:first-child {
  border-top: 1px solid var(--line);
}

.page-about .stage__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(42px, 11vw, 96px);
  line-height: 0.78;
  letter-spacing: -0.03em;
  color: var(--text-faint);
  transition: color 0.3s ease, text-shadow 0.3s ease;
}

.page-about .stage:target .stage__num {
  color: var(--accent);
  text-shadow: 0 0 28px rgba(200, 241, 60, 0.28);
}

.page-about .stage:target {
  background: linear-gradient(90deg, var(--accent-soft), transparent 62%);
}

.page-about .stage__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--head);
}

.page-about .stage__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
}

/* ---------- 团队 ---------- */

.page-about .crew__cols {
  display: grid;
  gap: 16px;
}

.page-about .crew__unit {
  position: relative;
  padding: 22px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .crew__role {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent-2);
}

.page-about .crew__count {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0 0 12px;
}

.page-about .crew__count .num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--head);
}

.page-about .crew__suffix {
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .crew__desc {
  margin: 0 0 14px;
  font-size: 14.5px;
}

.page-about .crew__tasks {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .crew__tasks li {
  padding: 8px 0 8px 14px;
  position: relative;
  font-size: 13.5px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--line);
}

.page-about .crew__tasks li:last-child {
  border-bottom: 0;
}

.page-about .crew__tasks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 9px;
  height: 1px;
  background: var(--accent);
}

/* ---------- 工序 ---------- */

.page-about .flow {
  display: grid;
  gap: 28px;
}

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

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

.page-about .flow-step {
  position: relative;
  padding: 18px 0 18px 52px;
  border-top: 1px solid var(--line);
}

.page-about .flow-step:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .flow-step__idx {
  position: absolute;
  left: 0;
  top: 16px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.page-about .flow-step:first-child .flow-step__idx {
  top: 2px;
}

.page-about .flow-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 24px);
  letter-spacing: -0.01em;
  color: var(--head);
}

.page-about .flow-step p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
}

/* ---------- 合作生态 ---------- */

.page-about .pnet {
  display: grid;
  gap: 28px;
}

.page-about .pnet__text p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15px;
}

.page-about .pnet__big {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--head);
}

.page-about .pnet__big .num {
  font-family: var(--font-mono);
  font-size: 1.7em;
  line-height: 0.9;
  color: var(--accent-2);
}

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

/* ---------- 本地化 ---------- */

.page-about .local-list {
  margin: 0;
}

.page-about .local-row {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .local-row:first-child {
  border-top: 1px solid var(--line);
}

.page-about .local-row dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--accent);
}

.page-about .local-row dd {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
}

/* ---------- 收束 ---------- */

.page-about .about-close {
  padding: clamp(44px, 6vw, 88px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-close p {
  max-width: 68ch;
  margin: 0 0 16px;
  font-size: 15.5px;
}

.page-about .about-close a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-soft);
}

.page-about .about-close a:hover,
.page-about .about-close a:focus-visible {
  border-bottom-color: var(--accent);
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-close__links a {
  border-bottom: 0;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    column-gap: 56px;
    align-items: end;
  }

  .page-about .about-intro .eyebrow {
    grid-column: 1 / -1;
  }

  .page-about .about-intro h1 {
    grid-column: 1;
  }

  .page-about .about-intro__body {
    grid-column: 2;
    padding-bottom: 6px;
  }

  .page-about .about-figures {
    grid-column: 1 / -1;
  }

  .page-about .about-head {
    gap: 16px 32px;
  }

  .page-about .stage {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
    padding: 34px 0;
  }

  .page-about .stage__num {
    font-size: clamp(64px, 8vw, 112px);
  }

  .page-about .crew__cols {
    grid-template-columns: 1.05fr 1fr 0.95fr;
    gap: 0;
    padding-top: 26px;
    border-top: 1px solid var(--line);
  }

  .page-about .crew__unit {
    padding: 0 28px;
    background: transparent;
    border: 0;
    border-right: 1px solid var(--line);
    border-radius: 0;
  }

  .page-about .crew__unit:first-child {
    padding-left: 0;
  }

  .page-about .crew__unit:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .crew__unit::before {
    content: "";
    position: absolute;
    left: 28px;
    top: -26px;
    width: 1px;
    height: 26px;
    background: var(--accent-soft);
  }

  .page-about .crew__unit::after {
    content: "";
    position: absolute;
    left: 24px;
    top: -31px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px rgba(200, 241, 60, 0.5);
  }

  .page-about .crew__unit:first-child::before {
    left: 0;
  }

  .page-about .crew__unit:first-child::after {
    left: -4px;
  }

  .page-about .flow {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .pnet {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .local-row {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 32px;
    align-items: baseline;
    padding: 24px 0;
  }
}

@media (min-width: 1200px) {
  .page-about .about-intro h1 {
    font-size: clamp(56px, 5.6vw, 86px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage__num,
  .page-about .stage-switch__list a {
    transition: none;
  }
}