/* ===== 我们是谁 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --about-side-w: 246px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(28px, 5vw, 62px) 0;
  overflow: hidden;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--text-mute);
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .breadcrumb a {
  color: var(--text-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--brand-400);
  border-bottom-color: var(--brand-400);
}

.page-about .breadcrumb__current {
  color: var(--snow);
}

.page-about .about-hero__head {
  max-width: 940px;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(32px, 5.2vw, 66px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -.015em;
  color: var(--snow);
}

.page-about .about-hero .lead {
  margin: 22px 0 0;
  max-width: 64ch;
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 首屏团队数字 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: clamp(22px, 3vw, 34px) 0 0;
  border-top: 1px solid var(--line-700);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

@media (min-width: 720px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

.page-about .about-crew__item {
  min-width: 0;
}

.page-about .about-crew__row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-crew__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 600;
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--brand-500);
}

.page-about .about-crew__name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--snow);
}

.page-about .about-crew__bar {
  display: block;
  height: 4px;
  margin: 14px 0 10px;
  border-radius: 2px;
  background: var(--line-700);
  overflow: hidden;
}

.page-about .about-crew__bar i {
  display: block;
  height: 100%;
  width: var(--pct, 40%);
  border-radius: 2px;
  background: var(--brand-500);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 山脉轮廓分隔 ---------- */
.page-about .about-ridge {
  margin-top: clamp(28px, 4vw, 46px);
  color: var(--line-700);
  line-height: 0;
}

.page-about .about-ridge svg {
  display: block;
  width: 100%;
  height: clamp(46px, 6vw, 82px);
}

.page-about .about-ridge polyline {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}

/* ---------- 主体错列布局 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 52px);
  padding-block: clamp(32px, 5vw, 66px);
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) var(--about-side-w);
    gap: clamp(42px, 5vw, 82px);
  }
}

.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 6vw, 90px);
  min-width: 0;
}

/* ---------- 右侧章节索引 ---------- */
.page-about .about-side {
  min-width: 0;
}

@media (min-width: 1080px) {
  .page-about .about-side {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

.page-about .about-index {
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  background: var(--ink-800);
  padding: 18px 16px 20px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  counter-reset: about-idx;
}

.page-about .about-index__list a {
  display: block;
  position: relative;
  padding: 9px 10px 9px 30px;
  border-radius: var(--radius-s);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-dim);
  text-decoration: none;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.page-about .about-index__list a::before {
  counter-increment: about-idx;
  content: counter(about-idx, decimal-leading-zero);
  position: absolute;
  left: 8px;
  top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .02em;
  color: var(--mist);
  transition: color var(--dur-1) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  background: rgba(255, 90, 31, .12);
  color: var(--snow);
}

.page-about .about-index__list a:hover::before,
.page-about .about-index__list a:focus-visible::before {
  color: var(--brand-500);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  min-width: 0;
  scroll-margin-top: 116px;
}

.page-about .about-block h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .about-block h3 {
  margin: 0;
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-prose {
  margin-top: 20px;
  max-width: 68ch;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

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

/* ---------- 区间柱状示意 ---------- */
.page-about .about-ticks {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  max-width: 680px;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
}

.page-about .about-tick {
  min-width: 0;
  height: 152px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 10px;
}

.page-about .about-tick__bar {
  display: block;
  width: 100%;
  border-radius: 3px 3px 0 0;
  background: var(--brand-500);
}

.page-about .about-tick:nth-child(1) .about-tick__bar { height: 54px; background: var(--brand-500); }
.page-about .about-tick:nth-child(2) .about-tick__bar { height: 40px; background: rgba(255, 90, 31, .72); }
.page-about .about-tick:nth-child(3) .about-tick__bar { height: 66px; background: var(--brand-500); }
.page-about .about-tick:nth-child(4) .about-tick__bar { height: 30px; background: rgba(255, 90, 31, .45); }
.page-about .about-tick:nth-child(5) .about-tick__bar { height: 44px; background: rgba(255, 90, 31, .72); }
.page-about .about-tick:nth-child(6) .about-tick__bar { height: 78px; background: var(--brand-500); }

.page-about .about-tick__t {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .02em;
  text-align: center;
  color: var(--mist);
  white-space: nowrap;
}

/* ---------- 图注容器 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-l);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-figure--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-figure figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--line-700);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 三支团队卡片 ---------- */
.page-about .about-roles {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-role {
  min-width: 0;
  padding: 18px 18px 20px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  background: var(--ink-800);
}

.page-about .about-role__kicker {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  border: 1px solid rgba(255, 90, 31, .42);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--brand-400);
}

.page-about .about-role h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 四道工序 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-700);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-700);
}

@media (max-width: 520px) {
  .page-about .about-step {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding: 18px 0;
  }
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--brand-500);
}

.page-about .about-step__body {
  min-width: 0;
}

.page-about .about-step__body h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 高原服务 ---------- */
.page-about .about-plateau__layout {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

@media (min-width: 900px) {
  .page-about .about-plateau__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 34px;
    align-items: start;
  }
}

.page-about .about-plateau__text {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 60ch;
}

.page-about .about-plateau__text p {
  margin: 0;
}

.page-about .about-plateau__layout .about-figure {
  margin-top: 0;
}

.page-about .about-map {
  margin-top: 28px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-l);
  background:
    radial-gradient(circle at 50% 38%, rgba(79, 182, 232, .14), transparent 62%),
    radial-gradient(circle at 22% 78%, rgba(63, 169, 129, .12), transparent 55%),
    var(--ink-800);
  overflow: hidden;
}

.page-about .about-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-map__links path {
  fill: none;
  stroke: var(--line-700);
  stroke-width: 1;
  stroke-dasharray: 3 4;
}

.page-about .about-node__dot {
  fill: var(--brand-500);
  transform-box: fill-box;
  transform-origin: center;
  transition: transform var(--dur-2) var(--ease), fill var(--dur-2) var(--ease);
}

.page-about .about-node--hub .about-node__dot {
  fill: var(--brand-400);
}

.page-about .about-node:hover .about-node__dot {
  transform: scale(1.7);
  fill: var(--brand-400);
}

.page-about .about-node__label {
  fill: var(--snow);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  transition: fill var(--dur-2) var(--ease);
}

.page-about .about-node:hover .about-node__label {
  fill: var(--brand-400);
}

/* ---------- 演进阶段 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-stage {
  position: relative;
  min-width: 0;
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  background: var(--ink-800);
}

@media (max-width: 560px) {
  .page-about .about-stage {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
}

.page-about .about-stage__ver {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--brand-500);
}

.page-about .about-stage__body {
  min-width: 0;
}

.page-about .about-stage__body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.page-about .about-stage__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-stage--current {
  background: var(--paper);
  border-color: var(--brand-500);
  box-shadow: var(--shadow-soft);
}

.page-about .about-stage--current .about-stage__ver {
  color: var(--brand-700);
}

.page-about .about-stage--current .about-stage__body h3 {
  color: var(--on-paper);
}

.page-about .about-stage--current .about-stage__body p {
  color: var(--on-paper-dim);
}

.page-about .about-stage--current::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: var(--brand-500);
}

/* ---------- 三条线 ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 780px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-principle {
  min-width: 0;
  padding: 18px 18px 20px;
  border-top: 3px solid var(--brand-500);
  border-radius: 0 0 var(--radius-m) var(--radius-m);
  background: rgba(20, 41, 74, .68);
}

.page-about .about-principle h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.page-about .about-principle p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  margin-top: clamp(42px, 6vw, 74px);
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-l);
  background:
    linear-gradient(150deg, rgba(255, 90, 31, .13), transparent 58%),
    var(--ink-800);
}

.page-about .about-next h2 {
  margin: 0 0 20px;
  font-size: clamp(21px, 2.3vw, 28px);
  line-height: 1.2;
  font-weight: 900;
  color: var(--snow);
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

@media (min-width: 700px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

.page-about .about-next__list a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-m);
  background: rgba(11, 27, 51, .55);
  text-decoration: none;
  transition: border-color var(--dur-2) var(--ease), background var(--dur-2) var(--ease), transform var(--dur-2) var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--brand-500);
  background: rgba(255, 90, 31, .1);
  transform: translateX(3px);
}

.page-about .about-next__k {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-next__d {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 520px) {
  .page-about .about-ticks {
    gap: 4px;
  }

  .page-about .about-tick {
    height: 122px;
  }

  .page-about .about-tick__t {
    font-size: 9.5px;
    letter-spacing: 0;
  }

  .page-about .about-hero__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-side {
    order: 2;
  }
}

.page-about {
  --pct: 1rem;
}