/* ===== page-about 页面专属样式 ===== */

.page-about {
  --about-rail-w: 236px;
  --about-shift: 0px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + var(--sp-6));
  padding-bottom: var(--sp-5);
  overflow: hidden;
  background:
    radial-gradient(118% 76% at 84% 4%, rgba(47, 122, 114, .30), transparent 62%),
    linear-gradient(180deg, #0A1F1A 0%, #0A1F1A 62%, #081815 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: 22%;
  width: 44%;
  height: 3px;
  background: var(--c-steel);
  opacity: .45;
  transform: rotate(-16deg);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: var(--sp-4);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: end;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr);
    gap: var(--sp-6);
  }
}

.page-about .about-hero h1 {
  margin: var(--sp-2) 0 var(--sp-3);
  font-size: clamp(2.05rem, 7.2vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: .04em;
  color: var(--c-white);
}

.page-about .about-hero .lead {
  max-width: 46ch;
  margin: 0;
  color: var(--c-moss);
  font-size: 1.02rem;
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--c-line-dark);
  border: var(--border-w) solid var(--c-line-dark);
}

.page-about .about-fact {
  background: var(--c-panel);
  padding: var(--sp-2);
}

.page-about .about-fact dt {
  margin: 0;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--c-moss);
}

.page-about .about-fact dd {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-white);
}

.page-about .about-fact dd .mono {
  font-size: 1.7rem;
  line-height: 1;
  color: var(--c-white);
}

/* 阶段条 */
.page-about .about-stagebar {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-2);
  margin-top: var(--sp-5);
  padding-top: var(--sp-3);
  border-top: var(--border-w) solid var(--c-line-dark);
}

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

.page-about .about-stagebar__item {
  display: grid;
  gap: 4px;
  padding: var(--sp-2);
  border: var(--border-w) solid transparent;
  text-decoration: none;
  transition: border-color var(--dur-fast) var(--ease-mech),
              background-color var(--dur-fast) var(--ease-mech);
}

.page-about .about-stagebar__item:hover,
.page-about .about-stagebar__item:focus-visible {
  border-color: var(--c-steel);
  background: rgba(47, 122, 114, .14);
}

.page-about .about-stagebar__num {
  font-size: .8rem;
  color: var(--c-steel);
  letter-spacing: .1em;
}

.page-about .about-stagebar__name {
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--c-white);
}

.page-about .about-stagebar__note {
  font-size: .8rem;
  color: var(--c-moss);
}

/* ---------- 主骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: start;
  padding-block: var(--sp-5) var(--sp-6);
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--sp-6);
  }
}

/* 左侧时间轴 */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__inner {
  position: relative;
  padding-left: var(--sp-2);
}

.page-about .about-rail__inner::before {
  content: "";
  position: absolute;
  left: calc(var(--sp-2) + 7px);
  top: 42px;
  bottom: 6px;
  width: 3px;
  background: var(--c-line-dark);
}

@media (min-width: 980px) {
  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--header-h) + var(--sp-3));
  }
}

.page-about .about-rail__inner .toc-link {
  display: block;
  position: relative;
  padding: 10px 0 10px 30px;
  font-size: .94rem;
  line-height: 1.5;
  color: var(--c-moss);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-mech);
}

.page-about .about-rail__inner .toc-link::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 13px;
  width: 13px;
  height: 13px;
  background: var(--c-deep);
  border: 3px solid var(--c-stone);
  transition: background-color var(--dur-mid) var(--ease-mech),
              border-color var(--dur-mid) var(--ease-mech),
              transform var(--dur-mid) var(--ease-mech);
}

.page-about .about-rail__inner .toc-link:hover {
  color: var(--c-white);
}

.page-about .about-rail__inner .toc-link[data-active] {
  color: var(--c-white);
  font-weight: 700;
}

.page-about .about-rail__inner .toc-link[data-active]::before {
  background: var(--c-lime);
  border-color: var(--c-lime);
  transform: scale(1.18);
}

/* 右侧内容列 */
.page-about .about-body {
  display: grid;
  gap: var(--sp-6);
  min-width: 0;
}

.page-about .about-block {
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + var(--sp-3));
}

.page-about .about-block__head {
  max-width: 60ch;
  margin-bottom: var(--sp-4);
}

.page-about .about-block__head h2 {
  margin: var(--sp-1) 0 var(--sp-2);
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: .03em;
  color: var(--c-white);
}

.page-about .about-block__intro {
  margin: 0;
  color: var(--c-moss);
  line-height: 1.85;
}

/* 米白区段 */
.page-about .about-block--bone {
  padding: var(--sp-4);
  background: var(--c-bone);
  border: var(--border-w) solid var(--c-line-dark);
  box-shadow: var(--shadow-hard);
}

.page-about .about-block--bone .about-block__head h2 {
  color: var(--c-ink);
}

.page-about .about-block--bone .about-block__intro,
.page-about .about-block--bone p {
  color: #4C5A53;
}

/* ---------- 阶段卡片 ---------- */
.page-about .about-stages {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-2);
  padding: var(--sp-3);
  background: var(--c-panel);
  border: var(--border-w) solid var(--c-line-dark);
  box-shadow: var(--shadow-hard);
  transition: border-color var(--dur-mid) var(--ease-mech),
              transform var(--dur-mid) var(--ease-mech);
}

@media (min-width: 640px) {
  .page-about .about-stage {
    grid-template-columns: 74px minmax(0, 1fr);
    gap: var(--sp-3);
    align-items: start;
    transform: translateX(var(--about-shift));
  }

  .page-about .about-stage:nth-child(even) {
    --about-shift: 20px;
  }

  .page-about .about-stage:hover {
    --about-shift: 8px;
    border-color: var(--c-steel);
  }

  .page-about .about-stage:nth-child(even):hover {
    --about-shift: 28px;
  }
}

.page-about .about-stage__num {
  display: block;
  font-size: 1.85rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-steel);
}

.page-about .about-stage__body h3 {
  margin: 0;
  color: var(--c-white);
}

.page-about .about-stage__body p {
  margin: var(--sp-2) 0 0;
  color: var(--c-moss);
  line-height: 1.8;
}

.page-about .about-stage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: var(--sp-2) 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 团队 ---------- */
.page-about .about-figure {
  margin: 0 0 var(--sp-4);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-w) solid var(--c-line-dark);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  margin: 0 0 var(--sp-4);
  border: var(--border-w) solid var(--c-line-dark);
  border-bottom: 0;
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-team__item {
  padding: var(--sp-3);
  background: var(--c-panel);
  border-bottom: var(--border-w) solid var(--c-line-dark);
  transition: background-color var(--dur-fast) var(--ease-mech);
}

@media (min-width: 760px) {
  .page-about .about-team__item:nth-child(odd) {
    border-right: var(--border-w) solid var(--c-line-dark);
  }
}

.page-about .about-team__item:hover {
  background: var(--c-ink);
}

.page-about .about-team__item h3 {
  margin: 0 0 var(--sp-2);
  color: var(--c-white);
}

.page-about .about-team__item p {
  margin: 0;
  color: var(--c-moss);
  line-height: 1.78;
}

/* 接力图 */
.page-about .about-flow-wrap {
  margin-top: var(--sp-2);
}

.page-about .about-flow-title {
  margin: 0 0 var(--sp-2);
}

.page-about .about-flow {
  display: block;
  width: 100%;
  max-width: 760px;
  height: auto;
  min-width: 0;
}

.page-about .about-flow__node {
  fill: var(--c-panel);
  stroke: var(--c-stone);
  stroke-width: 2;
  transition: stroke var(--dur-mid) var(--ease-mech),
              fill var(--dur-mid) var(--ease-mech);
}

.page-about .about-flow__label {
  fill: var(--c-white);
  font-family: var(--font-body);
  font-size: 15px;
  text-anchor: middle;
  dominant-baseline: middle;
}

.page-about .about-flow__link {
  fill: none;
  stroke: var(--c-stone);
  stroke-width: 2;
  stroke-dasharray: 6 5;
  transition: stroke var(--dur-mid) var(--ease-mech);
}

.page-about .about-flow__g:hover .about-flow__node {
  stroke: var(--c-lime);
  fill: #16211D;
}

.page-about .about-flow__g:hover .about-flow__link {
  stroke: var(--c-lime);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-network {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: start;
}

@media (min-width: 820px) {
  .page-about .about-network {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: var(--sp-5);
  }
}

.page-about .about-network__copy p {
  margin: 0 0 var(--sp-2);
  color: var(--c-moss);
  line-height: 1.85;
}

.page-about .about-network__copy a {
  color: var(--c-white);
  text-decoration: underline;
  text-decoration-color: var(--c-steel);
  text-underline-offset: 4px;
}

.page-about .about-network__copy a:hover {
  text-decoration-color: var(--c-lime);
}

.page-about .about-regions {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
  max-width: 380px;
  margin: var(--sp-3) 0 var(--sp-2);
}

.page-about .about-regions span {
  display: block;
  aspect-ratio: 1 / 1;
  background: var(--c-steel);
  opacity: .55;
  border: 2px solid var(--c-line-dark);
}

.page-about .about-regions span:nth-child(3n) {
  opacity: .85;
}

.page-about .about-regions span:nth-child(7n) {
  background: var(--c-amber);
  opacity: .9;
}

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

/* ---------- 资料整编 ---------- */
.page-about .about-pack {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}

@media (min-width: 720px) {
  .page-about .about-pack {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-3);
  }
}

.page-about .about-pack__layer {
  padding: var(--sp-3);
  background: var(--c-deep);
  border: var(--border-w) solid var(--c-line-dark);
  transition: transform var(--dur-mid) var(--ease-mech);
}

@media (min-width: 720px) {
  .page-about .about-pack__layer:nth-child(2) {
    transform: translateY(-16px);
  }

  .page-about .about-pack__layer:hover {
    transform: translateY(-6px);
  }

  .page-about .about-pack__layer:nth-child(2):hover {
    transform: translateY(-24px);
  }
}

.page-about .about-pack__num {
  display: inline-block;
  margin-bottom: var(--sp-2);
  padding: 3px 8px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--c-amber);
  border: 2px solid var(--c-amber);
}

.page-about .about-pack__layer h3 {
  margin: 0 0 var(--sp-2);
  color: var(--c-white);
}

.page-about .about-pack__layer p {
  margin: 0;
  color: var(--c-moss);
  line-height: 1.78;
}

.page-about .about-pack__tail {
  margin: 0;
  padding-top: var(--sp-3);
  border-top: var(--border-w) solid rgba(110, 124, 116, .35);
  line-height: 1.85;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 0;
  margin: 0 0 var(--sp-3);
  padding: 0;
  list-style: none;
  border-top: var(--border-w) solid var(--c-line-dark);
}

.page-about .about-rhythm li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: var(--sp-3) 0;
  border-bottom: var(--border-w) solid var(--c-line-dark);
  color: var(--c-moss);
  line-height: 1.8;
}

@media (min-width: 700px) {
  .page-about .about-rhythm li {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: var(--sp-4);
    align-items: baseline;
  }
}

.page-about .about-rhythm .mono {
  font-size: .96rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--c-white);
}

.page-about .about-rhythm__tail {
  margin: 0;
  max-width: 62ch;
  color: var(--c-moss);
  line-height: 1.85;
}

/* ---------- 合作入口 ---------- */
.page-about .about-coop {
  padding: var(--sp-4);
}

.page-about .about-coop h2 {
  margin: var(--sp-1) 0 var(--sp-2);
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.16;
  letter-spacing: .03em;
  color: var(--c-ink);
}

.page-about .about-coop > p {
  margin: 0 0 var(--sp-3);
  max-width: 58ch;
  line-height: 1.85;
}

.page-about .about-coop__actions {
  gap: var(--sp-2);
}

.page-about .about-coop__note {
  margin: var(--sp-3) 0 0;
}

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

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease-mech), transform 420ms var(--ease-mech);
}

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

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

  .page-about .about-stage:hover,
  .page-about .about-pack__layer:hover {
    transform: none;
  }
}