.page-about {
  --about-gap: clamp(20px, 5vw, 64px);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .about-head {
  max-width: 760px;
  display: grid;
  gap: 14px;
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--paper);
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.35;
  margin: 0;
  color: var(--paper);
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 56px;
  border-bottom: var(--line-soft);
  background:
    repeating-linear-gradient(0deg, var(--scan) 0 1px, transparent 1px 6px),
    linear-gradient(155deg, var(--ink-2) 0%, var(--ink) 72%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__copy {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 10vw, 92px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  text-transform: none;
  margin: 0;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 620px;
  color: var(--sand-lt);
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.8;
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-hero__media {
  aspect-ratio: 9 / 7;
  border: var(--line-soft);
  background: linear-gradient(180deg, var(--ink-2), rgba(15, 42, 36, 0.9));
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  border-bottom: var(--line-soft);
}

.page-about .about-roles__grid {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-role {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--ink-2);
  border: var(--line-soft);
  border-left: 3px solid var(--sand);
  border-radius: var(--r);
  display: grid;
  gap: 12px;
  align-content: start;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-role:hover {
  transform: translateY(-6px);
  border-color: var(--sand);
  box-shadow: inset 0 0 0 1px rgba(217, 169, 76, 0.35);
}

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

.page-about .about-role p {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 241, 230, 0.82);
}

.page-about .about-role__points {
  list-style: none;
  margin: 4px 0 0;
  padding: 14px 0 0;
  border-top: var(--line-soft);
  display: grid;
  gap: 8px;
}

.page-about .about-role__points li {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--moss);
  padding-left: 14px;
  position: relative;
  transition: color 0.2s ease;
}

.page-about .about-role__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 1px;
  background: var(--moss);
  transition: background 0.2s ease;
}

.page-about .about-role:hover .about-role__points li {
  color: var(--sand-lt);
}

.page-about .about-role:hover .about-role__points li::before {
  background: var(--neon);
}

.page-about .about-roles__media {
  margin: 36px 0 0;
  border: var(--line-soft);
}

/* ---------- 历程 ---------- */
.page-about .about-history {
  border-bottom: var(--line-soft);
}

.page-about .about-history__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-history__text {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-history__media {
  margin: 12px 0 0;
  border: var(--line-soft);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--moss);
  opacity: 0.7;
}

.page-about .about-phase {
  position: relative;
  padding: 16px 16px 18px 22px;
  border-radius: var(--r);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-phase:target {
  background: rgba(217, 169, 76, 0.12);
  box-shadow: inset 3px 0 0 var(--neon);
}

.page-about .about-phase__node {
  position: absolute;
  left: -20px;
  top: 21px;
  display: block;
  width: 12px;
  height: 12px;
  text-decoration: none;
}

.page-about .about-phase__dot {
  display: block;
  width: 11px;
  height: 11px;
  border: 2px solid var(--sand);
  background: var(--ink);
  border-radius: 2px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-phase:hover .about-phase__dot,
.page-about .about-phase:target .about-phase__dot {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .about-phase__body {
  display: grid;
  gap: 8px;
}

.page-about .about-phase__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--sand);
}

.page-about .about-phase__body p:last-child {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 241, 230, 0.82);
  max-width: 620px;
}

/* ---------- 更新周期 ---------- */
.page-about .about-band {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(76, 122, 99, 0.5);
  border: var(--line-soft);
}

.page-about .about-band__step {
  background: var(--ink-2);
  padding: 22px 20px 26px;
  display: grid;
  gap: 10px;
  align-content: start;
}

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

.page-about .about-band__step p {
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.78);
}

.page-about .about-band__bar {
  display: block;
  position: relative;
  height: 4px;
  margin-top: 14px;
  background: rgba(76, 122, 99, 0.45);
  overflow: hidden;
}

.page-about .about-band__bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 60%;
  background: linear-gradient(90deg, var(--sand), var(--neon));
}

.page-about .about-band__step:nth-child(1) .about-band__bar::after { width: 82%; }
.page-about .about-band__step:nth-child(2) .about-band__bar::after { width: 58%; }
.page-about .about-band__step:nth-child(3) .about-band__bar::after { width: 100%; }
.page-about .about-band__step:nth-child(4) .about-band__bar::after { width: 44%; }

/* ---------- 反馈路径 ---------- */
.page-about .about-feedback {
  border-top: var(--line-soft);
  border-bottom: var(--line-soft);
  background: linear-gradient(180deg, rgba(28, 61, 51, 0.6), rgba(15, 42, 36, 0));
}

.page-about .about-feedback__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-feedback__lead {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-feedback__link {
  justify-self: start;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(76, 122, 99, 0.4);
  border: var(--line-soft);
}

.page-about .about-flow__step {
  background: var(--ink);
  padding: 20px 20px 22px;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 7px;
  align-items: start;
}

.page-about .about-flow__n {
  grid-row: 1 / span 2;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--sand);
  border-radius: 2px;
}

.page-about .about-flow__step h3 {
  font-size: 17px;
  align-self: center;
}

.page-about .about-flow__step p {
  grid-column: 2;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.78);
}

/* ---------- 长期维护 ---------- */
.page-about .about-pledge__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-pledge__lead {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-pledge__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--line-soft);
}

.page-about .about-pledge__list li {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: var(--line-soft);
}

.page-about .about-pledge__list strong {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--sand);
  font-weight: 500;
}

.page-about .about-pledge__list span {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(245, 241, 230, 0.82);
}

/* ---------- 相关入口 ---------- */
.page-about .about-more__title {
  font-size: clamp(20px, 3vw, 26px);
  margin-bottom: 20px;
}

.page-about .about-index {
  display: grid;
  gap: 1px;
  background: rgba(76, 122, 99, 0.45);
  border: var(--line-soft);
}

.page-about .about-index__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  background: var(--ink-2);
  text-decoration: none;
  transition: background 0.2s ease;
}

.page-about .about-index__item:hover {
  background: rgba(217, 169, 76, 0.14);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--neon);
  text-align: center;
}

.page-about .about-index__txt {
  display: grid;
  gap: 4px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-index__txt span {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 14px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 40px 0 72px;
  }

  .page-about .about-roles__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-role--b {
    margin-top: 30px;
  }

  .page-about .about-role--c {
    margin-top: 12px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero__copy {
    padding-bottom: 8px;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-feedback__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-pledge__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-phase,
  .page-about .about-phase__dot,
  .page-about .about-role__points li,
  .page-about .about-role__points li::before,
  .page-about .about-index__item {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}