.page-about {
  --about-rail-w: 92px;
  background: var(--ink-900);
  color: var(--cream);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(104px, 18vw, 176px) var(--gutter) clamp(44px, 7vw, 80px);
  background: linear-gradient(158deg, var(--ink-900) 0%, var(--ink-800) 62%, #143149 100%);
  overflow: hidden;
}

.page-about .about-hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.85);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(120% 78% at 10% 0%, rgba(44, 242, 208, .15), transparent 56%),
    linear-gradient(180deg, rgba(10, 26, 42, .58) 0%, rgba(10, 26, 42, .9) 72%, var(--ink-900) 100%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--wrap);
  margin: 0 auto;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  max-width: 17ch;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.6vw, 4.5rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-hero-lead {
  margin: 0 0 30px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.78;
  color: var(--cream-72);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb-item {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--rock);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-700);
}

.page-about .breadcrumb-link {
  color: var(--cream-56);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--cream);
}

/* ---------- 主体分屏 ---------- */
.page-about .about-body {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(64px, 10vw, 128px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

/* 左侧年份刻度 */
.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin: 0 0 8px;
  padding: 10px 0 12px;
  background: rgba(10, 26, 42, .93);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(10px);
}

.page-about .about-rail-note {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--rock);
}

.page-about .about-ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tick-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--cream-56);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .about-tick-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--ink-700);
  box-shadow: inset 0 0 0 1px var(--line);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-tick-link:hover,
.page-about .about-tick-link:focus-visible {
  color: var(--cyan);
}

.page-about .about-tick-link:hover .about-tick-dot,
.page-about .about-tick-link:focus-visible .about-tick-dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

/* 右侧内容流 */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(34px, 6vw, 76px);
  padding-top: clamp(24px, 4vw, 44px);
  min-width: 0;
}

/* ---------- 阶段卡片 ---------- */
.page-about .about-stage {
  position: relative;
  padding: clamp(22px, 4vw, 36px) clamp(20px, 4vw, 42px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  background: linear-gradient(150deg, rgba(18, 40, 60, .94), rgba(10, 26, 42, .74));
  scroll-margin-top: calc(var(--header-h) + 96px);
  overflow: hidden;
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .about-stage::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 236px;
  height: 196px;
  border-radius: 62% 38% 44% 56% / 48% 55% 45% 52%;
  pointer-events: none;
}

.page-about .about-stage--moss::after {
  background: radial-gradient(circle at 42% 42%, rgba(60, 90, 73, .6), rgba(60, 90, 73, 0) 72%);
}

.page-about .about-stage--clay::after {
  background: radial-gradient(circle at 42% 42%, rgba(166, 92, 66, .55), rgba(166, 92, 66, 0) 72%);
}

.page-about .about-stage--cyan::after {
  background: radial-gradient(circle at 42% 42%, rgba(44, 242, 208, .28), rgba(44, 242, 208, 0) 72%);
}

.page-about .about-stage:target {
  border-color: rgba(44, 242, 208, .48);
  box-shadow: 0 0 0 1px rgba(44, 242, 208, .18), 0 26px 60px -34px rgba(44, 242, 208, .45);
}

.page-about .about-stage-tag {
  position: relative;
  z-index: 1;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: .24em;
  color: var(--cyan);
}

.page-about .about-stage--clay .about-stage-tag {
  color: var(--orange);
}

.page-about .about-stage--moss .about-stage-tag {
  color: var(--signal);
}

.page-about .about-stage-title {
  position: relative;
  z-index: 1;
  margin: 0 0 14px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-stage-body {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.78;
  color: var(--cream-72);
}

/* ---------- 编号章节通用 ---------- */
.page-about .about-sec {
  padding-top: clamp(34px, 6vw, 64px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2.6vw, 24px);
  margin-bottom: 18px;
}

.page-about .about-sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.4vw, 3.5rem);
  line-height: .92;
  letter-spacing: -.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(44, 242, 208, .45);
}

.page-about .about-sec-titles .eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
}

.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.3vw, 2rem);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-sec-lead {
  margin: 0 0 26px;
  max-width: 66ch;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.78;
  color: var(--cream-72);
}

.page-about .prose {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: clamp(15px, 1.55vw, 16.5px);
  line-height: 1.78;
  color: var(--cream-72);
}

.page-about .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 242, 208, .4);
  transition: border-color .2s var(--ease);
}

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

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-role {
  padding: clamp(18px, 3.4vw, 26px);
  background: var(--ink-800);
  transition: background .24s var(--ease);
}

.page-about .about-role:hover {
  background: #16314A;
}

.page-about .about-role-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 4.6vw, 2.7rem);
  line-height: 1;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-role-name {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--cream);
}

.page-about .about-role-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--rock);
  transition: color .24s var(--ease);
}

.page-about .about-role:hover .about-role-desc {
  color: var(--cream-72);
}

/* ---------- 分区标准 ---------- */
.page-about .about-standard {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-standard-media {
  border-radius: 120px 22px 120px 22px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
}

.page-about .about-standard-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

/* ---------- 三道校对 ---------- */
.page-about .about-checks-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-checks {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-check {
  padding: clamp(18px, 3.2vw, 26px);
  background: var(--ink-800);
}

.page-about .about-check-idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border-radius: 50%;
  border: 1px solid rgba(44, 242, 208, .45);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-check-title {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-check-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-check-figure {
  margin: 0;
}

.page-about .about-check-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 5;
  border-radius: var(--r-m) 90px var(--r-m) var(--r-m);
  border: 1px solid var(--line-soft);
}

.page-about .about-check-figure figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--rock);
}

/* ---------- 共建生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 3vw, 32px);
  margin-bottom: 22px;
}

.page-about .about-partner-stat {
  padding-top: 14px;
  border-top: 2px solid var(--line);
}

.page-about .about-partner-stat:nth-child(1) {
  border-top-color: var(--orange);
}

.page-about .about-partner-stat:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .about-partner-stat:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .about-partner-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cream);
}

.page-about .about-partner-label {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--rock);
}

.page-about .about-partners-body {
  margin-bottom: 0;
}

/* ---------- 四川区域服务 ---------- */
.page-about .about-sec--sichuan {
  position: relative;
}

.page-about .about-paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .about-path {
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--signal);
  border-radius: 0 var(--r-s) var(--r-s) 0;
  background: rgba(18, 40, 60, .6);
}

.page-about .about-path-name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-path-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--rock);
}

/* ---------- 延伸阅读 ---------- */
.page-about .about-next {
  padding: clamp(24px, 4vw, 36px) 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next-title {
  margin: 0 0 18px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-s);
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .about-next-item:hover {
  border-color: rgba(44, 242, 208, .45);
  background: rgba(44, 242, 208, .06);
}

.page-about .about-next-link {
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-next-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--rock);
}

/* ---------- 显现动效 ---------- */
.page-about .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.page-about .reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 640px ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

/* ---------- 860px ---------- */
@media (min-width: 860px) {
  .page-about .about-standard {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }

  .page-about .about-checks-wrap {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  }
}

/* ---------- 900px：进入左右分屏 ---------- */
@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    margin: 0;
    padding: 56px 0 0;
    background: none;
    border-bottom: 0;
    backdrop-filter: none;
  }

  .page-about .about-rail-note {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    font-size: 11px;
    margin: 0 0 20px;
  }

  .page-about .about-ticks {
    position: relative;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 52px;
    padding-left: 4px;
  }

  .page-about .about-ticks::before {
    content: "";
    position: absolute;
    left: 7.5px;
    top: 6px;
    bottom: 6px;
    width: 1px;
    background: linear-gradient(180deg, var(--ink-700), rgba(30, 58, 82, .2));
  }

  .page-about .about-tick {
    position: relative;
  }

  .page-about .about-tick-year {
    writing-mode: horizontal-tb;
  }

  .page-about .about-flow {
    padding-top: 56px;
  }

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

  .page-about .about-partners {
    gap: clamp(20px, 4vw, 46px);
  }
}

/* ---------- 1080px ---------- */
@media (min-width: 1080px) {
  .page-about .about-hero h1 {
    max-width: 15ch;
  }

  .page-about .about-flow {
    gap: clamp(48px, 6vw, 88px);
  }
}