.page-about {
  --about-x: clamp(20px, 5.5vw, 96px);
  --about-rail: 124px;
  --about-grid: rgba(16, 21, 18, 0.055);
  display: block;
  position: relative;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: var(--sp-6);
}

.page-about .about-shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--about-x);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

/* ---------- 刻度尺 ---------- */
.page-about .about-rail {
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__label {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: var(--sp-3);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 0 0 6px;
  border-bottom: 2px solid transparent;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
}

.page-about .about-rail__link.is-current {
  color: var(--ink-green);
  border-bottom-color: var(--amber);
}

/* ---------- 主叙事列 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .breadcrumbs {
  padding: var(--sp-4) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  padding: var(--sp-4) 0 var(--sp-6);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__title {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-head);
  font-size: clamp(40px, 9vw, 88px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--ink-green);
}

.page-about .about-hero__lede {
  margin: var(--sp-3) 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero__note {
  margin: var(--sp-3) 0 0;
  color: var(--amber);
  letter-spacing: 0.14em;
}

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

.page-about .media__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--ink-green);
}

.page-about .media__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(31, 191, 176, 0.16), transparent 45%, rgba(122, 75, 224, 0.18));
  pointer-events: none;
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: var(--sp-6) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 120px;
}

.page-about .about-section__head {
  margin-bottom: var(--sp-3);
}

.page-about .about-section__head--aside {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
}

.page-about .about-aside {
  display: none;
  color: var(--amber);
  letter-spacing: 0.28em;
}

.page-about .about-section__head .h-section,
.page-about .about-next__title {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-head);
  font-size: clamp(28px, 4.4vw, 48px);
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--ink-green);
}

.page-about .about-section .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .prose p {
  max-width: 40em;
  margin: 0 0 var(--sp-3);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .prose a {
  color: var(--ink-green);
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-underline-offset: 3px;
}

/* ---------- 双版本对照 ---------- */
.page-about .about-vs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: var(--sp-4);
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-vs__col {
  padding: var(--sp-4) var(--sp-3);
}

.page-about .about-vs__col--legacy {
  background: var(--ink-green);
}

.page-about .about-vs__col--v3 {
  background: var(--paper-3);
}

.page-about .about-vs__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-vs__col--legacy .about-vs__tag {
  color: var(--amber-soft);
}

.page-about .about-vs__col--v3 .about-vs__tag {
  color: var(--violet);
}

.page-about .about-vs__title {
  margin: var(--sp-2) 0 var(--sp-2);
  font-family: var(--font-head);
  font-size: 22px;
  line-height: 1.32;
}

.page-about .about-vs__col--legacy .about-vs__title {
  color: var(--paper);
}

.page-about .about-vs__col--v3 .about-vs__title {
  color: var(--ink-green);
}

.page-about .about-vs__text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-vs__col--legacy .about-vs__text {
  color: rgba(243, 237, 225, 0.78);
}

.page-about .about-vs__col--v3 .about-vs__text {
  color: var(--ink-soft);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0 0 0 var(--sp-4);
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 var(--sp-5) var(--sp-2);
  transition: background-color 0.3s var(--ease);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__node {
  position: absolute;
  left: calc(-1 * var(--sp-4) - 5px);
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--amber);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__node,
.page-about .about-timeline__item:focus-within .about-timeline__node {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(200, 145, 47, 0.16);
}

.page-about .about-timeline__stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: var(--sp-1) 0 var(--sp-2);
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.4;
  color: var(--ink-green);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-timeline__note {
  margin: var(--sp-2) 0 0;
  max-width: 38em;
  padding-left: var(--sp-2);
  border-left: 2px solid var(--amber-soft);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 四条准则 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-rules__item {
  position: relative;
  background: var(--paper-3);
  padding: var(--sp-4) var(--sp-3);
  transition: background-color 0.3s var(--ease);
}

.page-about .about-rules__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 0;
  background: var(--amber);
  transition: width 0.35s var(--ease);
}

.page-about .about-rules__item:hover {
  background: var(--paper);
}

.page-about .about-rules__item:hover::before {
  width: 100%;
}

.page-about .about-rules__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-rules__title {
  margin: var(--sp-2) 0 var(--sp-2);
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--ink-green);
}

.page-about .about-rules__text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队深色带 ---------- */
.page-about .about-section--band {
  padding: var(--sp-6) 0;
}

.page-about .about-band {
  position: relative;
  overflow: hidden;
  background: var(--ink-green);
  border: 1px solid var(--ink-green-2);
  padding: var(--sp-5) var(--sp-3);
}

.page-about .about-band__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.26;
  pointer-events: none;
}

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

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

.page-about .about-band .h-section {
  color: var(--paper);
}

.page-about .about-band .eyebrow {
  color: var(--amber-soft);
}

.page-about .about-band .prose p {
  color: rgba(243, 237, 225, 0.76);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: var(--sp-4);
  background: var(--line-inverse);
  border: 1px solid var(--line-inverse);
}

.page-about .about-team__card {
  background: rgba(12, 42, 36, 0.72);
  padding: var(--sp-4) var(--sp-3);
  transition: background-color 0.3s var(--ease);
}

.page-about .about-team__card:hover {
  background: rgba(12, 42, 36, 0.94);
}

.page-about .about-team__card h3 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-head);
  font-size: 19px;
  line-height: 1.4;
  color: var(--amber-soft);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(243, 237, 225, 0.74);
}

/* ---------- 本地服务 ---------- */
.page-about .about-local {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  align-items: center;
}

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

.page-about .about-local__facts {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-local__facts li {
  display: flex;
  gap: var(--sp-2);
  align-items: baseline;
  padding-top: var(--sp-2);
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-local__key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-local__facts a {
  color: var(--ink-green);
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-underline-offset: 3px;
}

/* ---------- 合作条目 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-partners li {
  display: flex;
  gap: var(--sp-3);
  align-items: baseline;
  padding: var(--sp-3) 0;
  background: var(--paper);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-partners__key {
  flex: 0 0 6em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-green);
}

/* ---------- 规模一览 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4) var(--sp-3);
}

.page-about .about-stats__item {
  padding-top: var(--sp-3);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 6vw, 54px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-green);
}

.page-about .about-stats__unit {
  margin-left: 4px;
  font-size: 0.42em;
  color: var(--amber);
}

.page-about .about-stats__label {
  display: block;
  margin-top: var(--sp-2);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-stats__lamp {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--cyan);
  vertical-align: middle;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: var(--sp-6) 0 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-next__list {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .about-next__item {
  background: var(--paper-3);
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--sp-4) var(--sp-3);
  text-decoration: none;
  transition: background-color 0.3s var(--ease);
}

.page-about .about-next__link strong {
  font-family: var(--font-head);
  font-size: 18px;
  line-height: 1.35;
  color: var(--ink-green);
  transition: color 0.3s var(--ease);
}

.page-about .about-next__link span {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  transition: color 0.3s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink-green);
}

.page-about .about-next__link:hover strong,
.page-about .about-next__link:focus-visible strong {
  color: var(--paper);
}

.page-about .about-next__link:hover span,
.page-about .about-next__link:focus-visible span {
  color: rgba(243, 237, 225, 0.78);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-aside {
    display: block;
  }

  .page-about .about-band {
    padding: var(--sp-6) var(--sp-4);
  }

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    column-gap: var(--sp-5);
    align-items: end;
    padding-top: var(--sp-5);
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    column-gap: var(--sp-5);
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--sp-5);
  }

  .page-about .about-rail {
    position: sticky;
    top: 140px;
    align-self: start;
    max-height: calc(100vh - 180px);
    padding: var(--sp-6) var(--sp-3) var(--sp-6) 0;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: var(--sp-2);
    overflow: visible;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 2px 0 2px 10px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-rail__link.is-current {
    border-left-color: var(--amber);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.001ms !important;
    animation: none !important;
  }
}