.page-about {
  --about-rail-w: 212px;
  --about-flow-gap: clamp(46px, 6vw, 84px);
  padding-bottom: clamp(56px, 8vw, 104px);
  overflow-x: clip;
  background:
    radial-gradient(90% 50% at 92% -8%, rgba(61, 242, 168, 0.1), transparent 60%),
    radial-gradient(60% 45% at -5% 46%, rgba(255, 138, 61, 0.055), transparent 65%);
}

/* ---------- 面包屑 / 首屏 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero {
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 0.42em 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 5.2vw, 58px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero .lede {
  margin-top: 1.15em;
  max-width: 34em;
  color: var(--muted);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.75) contrast(1.08) brightness(0.82);
}

.page-about .about-hero__figure figcaption {
  display: block;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--faint);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 3px;
  background: var(--mint);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  }
  .page-about .about-hero__figure {
    transform: translateY(-8px);
  }
}

/* ---------- 左轨 + 内容流 ---------- */
.page-about .about-shell {
  margin-top: clamp(42px, 6vw, 84px);
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--faint);
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  font-size: 12.5px;
  line-height: 1.5;
  transition: color 120ms ease, border-color 120ms ease;
}

.page-about .about-rail__list a .num {
  font-size: 11px;
  color: var(--warm);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--mint);
  border-color: var(--mint);
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 4.5vw, 68px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 104px;
    padding-left: 20px;
    border-left: 1px solid var(--line);
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
  }
  .page-about .about-rail__list li {
    border-bottom: 1px dashed rgba(28, 68, 56, 0.85);
  }
  .page-about .about-rail__list li:last-child {
    border-bottom: 0;
  }
  .page-about .about-rail__list a {
    width: 100%;
    padding: 12px 0;
    border: 0;
    font-size: 13px;
  }
  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    color: var(--mint-soft);
    border-color: transparent;
  }
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-flow-gap);
  min-width: 0;
}

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

@media (min-width: 1000px) {
  .page-about .about-flow > .about-block:nth-child(even) {
    width: calc(100% - clamp(0px, 5vw, 58px));
    margin-left: auto;
  }
}

.page-about .about-block h2 {
  margin: 0.45em 0 0.6em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .about-lede {
  max-width: 38em;
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-block h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.35;
  color: var(--text);
}

/* ---------- 指挥台面板 ---------- */
.page-about .command {
  padding: clamp(20px, 3vw, 34px);
}

.page-about .command .about-lede:last-of-type {
  margin-bottom: 0;
}

.page-about .command__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .command__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-top: 1px dashed var(--line);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .command__list li .num {
  padding-top: 3px;
  font-size: 12px;
  color: var(--mint);
}

.page-about .command__list strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 内容准则折叠面板 ---------- */
.page-about .rules {
  margin-top: 26px;
}

.page-about .rule {
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: border-color 120ms ease, background 120ms ease;
}

.page-about .rule:hover,
.page-about .rule:focus-within {
  border-color: var(--mint);
  background: var(--panel-2);
}

.page-about .rule summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px clamp(16px, 2.4vw, 24px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 19px);
  color: var(--text);
}

.page-about .rule summary::-webkit-details-marker {
  display: none;
}

.page-about .rule summary .num {
  font-size: 12px;
  color: var(--warm);
}

.page-about .rule summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--mint);
}

.page-about .rule[open] summary {
  color: var(--mint-soft);
}

.page-about .rule[open] summary::after {
  content: "–";
}

.page-about .rule__body {
  margin: 0;
  padding: 14px clamp(16px, 2.4vw, 24px) 22px;
  border-top: 1px dashed var(--line);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.8;
}

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

.page-about .rule__sep {
  height: 14px;
  margin-left: clamp(10px, 6%, 46px);
  border-left: 1px dashed var(--line);
}

.page-about .rules__foot {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--warm);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
  position: relative;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.6) brightness(0.8);
}

.page-about .about-figure figcaption {
  padding: 11px 16px 13px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--faint);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .team__item {
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  background: var(--panel);
  transition: border-color 120ms ease, background 120ms ease;
}

.page-about .team__item:hover {
  border-color: var(--mint);
  border-top-color: var(--warm);
  background: var(--panel-2);
}

.page-about .team__num {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mint);
  transition: color 120ms ease;
}

.page-about .team__item:hover .team__num {
  color: var(--warm);
}

.page-about .team__item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .team__total {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--faint);
}

@media (min-width: 760px) {
  .page-about .team {
    grid-template-columns: 1.15fr 0.95fr 0.9fr;
    gap: 16px;
    align-items: start;
  }
}

/* ---------- 发展阶段 ---------- */
.page-about .stages {
  position: relative;
  padding: clamp(22px, 3.4vw, 42px);
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .stages__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  filter: saturate(0.7) contrast(1.1);
}

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

.page-about .stages__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .stage {
  position: relative;
  padding: 18px 0 18px 22px;
  border-left: 1px dashed var(--line);
  transition: border-color 120ms ease;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--warm);
  transition: transform 120ms ease;
}

.page-about .stage:hover {
  border-left-color: var(--warm);
}

.page-about .stage:hover::before {
  transform: translateY(-2px);
}

.page-about .stage__year {
  display: block;
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(255, 138, 61, 0.82);
}

.page-about .stage__body p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.78;
}

.page-about .stage__note {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--faint);
}

@media (min-width: 760px) {
  .page-about .stage {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 38px);
    align-items: start;
    padding-left: 26px;
    padding-top: 22px;
    padding-bottom: 22px;
  }
  .page-about .stage::before {
    top: 30px;
  }
}

@media (hover: hover) and (min-width: 1000px) {
  .page-about .stage__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 180ms ease, opacity 180ms ease;
  }
  .page-about .stage:hover .stage__note,
  .page-about .stage:focus-within .stage__note {
    max-height: 120px;
    opacity: 1;
  }
}

/* ---------- 服务规模 ---------- */
.page-about .scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.page-about .scale__item {
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 120ms ease;
}

.page-about .scale__item:hover {
  border-color: var(--mint);
}

.page-about .scale__num {
  display: block;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mint);
}

.page-about .scale__unit {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .scale__item p {
  margin: 10px 0 0;
  color: var(--faint);
  font-size: 13px;
  line-height: 1.7;
}

.page-about .scale__item--hero {
  grid-column: span 2;
  background:
    linear-gradient(135deg, rgba(61, 242, 168, 0.1), transparent 62%),
    var(--panel-2);
}

.page-about .scale__item--hero .scale__num {
  font-size: clamp(44px, 7vw, 72px);
}

.page-about .scale__item--wide {
  grid-column: span 2;
  border-left: 2px solid var(--warm);
}

@media (min-width: 820px) {
  .page-about .scale {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .scale__item {
    grid-column: span 2;
  }
  .page-about .scale__item--hero {
    grid-column: span 3;
  }
  .page-about .scale__item--wide {
    grid-column: span 4;
  }
}

/* ---------- 反馈与收尾 ---------- */
.page-about .feedback {
  padding: clamp(20px, 3vw, 34px);
}

.page-about .feedback .about-lede {
  margin-bottom: 0;
  max-width: 36em;
}

.page-about .feedback__figures {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3vw, 44px);
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
}

.page-about .feedback__figures > div {
  min-width: 110px;
}

.page-about .feedback__num {
  display: block;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1;
  color: var(--warm);
}

.page-about .feedback__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .creed {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 6px 0 6px 18px;
  border-left: 2px solid var(--mint);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--mint-soft);
}

.page-about .next {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .next li {
  border-bottom: 1px solid var(--line);
}

.page-about .next a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 2px;
  color: var(--text);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.6;
  transition: color 120ms ease, padding-left 120ms ease;
}

.page-about .next a::after {
  content: "→";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--mint);
}

.page-about .next a:hover,
.page-about .next a:focus-visible {
  color: var(--mint);
  padding-left: 8px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next a,
  .page-about .team__item,
  .page-about .rule,
  .page-about .stage,
  .page-about .stage__note {
    transition: none;
  }
}