/* ==========================================================
   关于云开 · 页面专属样式（作用域：.page-about）
   ========================================================== */

.page-about {
  --about-rail: 52px;
  --about-panel: linear-gradient(180deg, rgba(24, 39, 71, 0.6), rgba(12, 21, 48, 0.34));
  overflow-x: clip;
}

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

/* ---------- 面包屑 ---------- */

.page-about .breadcrumbs {
  padding-top: 26px;
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 6vh, 62px) 0 clamp(44px, 8vh, 84px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 420px;
  background:
    radial-gradient(58% 100% at 20% 0%, rgba(244, 169, 58, 0.16), transparent 66%),
    radial-gradient(46% 92% at 80% 14%, rgba(91, 141, 245, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.page-about .about-hero__lead .eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 19ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--cloud);
}

.page-about .about-hero .lede {
  margin-top: 20px;
  max-width: 620px;
  font-size: 17px;
  line-height: 1.78;
  color: var(--cloud-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__side {
  position: relative;
  padding-left: 20px;
}

.page-about .about-hero__side::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, rgba(244, 169, 58, 0.62), rgba(147, 164, 195, 0.1));
}

.page-about .about-hero__sidenote {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .fact-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .fact:first-child {
  border-top: 1px solid var(--line);
}

.page-about .fact__num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--dawn);
  font-variant-numeric: tabular-nums;
}

.page-about .fact__text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  text-align: right;
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  margin-top: 4px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 14px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 26px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--cloud-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--dawn);
  border-bottom-color: rgba(244, 169, 58, 0.6);
}

.page-about .about-index__num {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  position: relative;
  padding: clamp(52px, 9vh, 104px) 0;
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(147, 164, 195, 0.34), rgba(147, 164, 195, 0.06) 58%, transparent);
  transform: rotate(-1.1deg);
  transform-origin: left center;
  pointer-events: none;
}

.page-about .about-section .section__head {
  display: grid;
  gap: 10px;
  max-width: 760px;
  margin-bottom: 38px;
}

.page-about .about-section .section-num {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--dawn);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--cloud);
}

.page-about .about-section .lede {
  margin: 0;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--cloud-soft);
}

/* ---------- 01 服务人群 ---------- */

.page-about .who-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .who-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .who-notes li {
  position: relative;
  padding: 15px 16px 15px 22px;
  border-left: 1px solid var(--line-strong);
  background: linear-gradient(90deg, rgba(24, 39, 71, 0.46), rgba(12, 21, 48, 0));
  font-size: 14px;
  line-height: 1.72;
  color: var(--cloud-soft);
}

.page-about .who-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 1px;
  background: var(--dawn);
}

/* ---------- 02 发展阶段 ---------- */

.page-about .stages-media {
  margin-bottom: 46px;
}

.page-about .stage-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .stage-track::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 16px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg,
      rgba(147, 164, 195, 0) 0%,
      rgba(147, 164, 195, 0.42) 6%,
      rgba(147, 164, 195, 0.42) 90%,
      rgba(147, 164, 195, 0) 100%);
  pointer-events: none;
}

.page-about .stage {
  position: relative;
  padding-left: var(--about-rail);
  padding-bottom: 22px;
}

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

.page-about .stage__num {
  position: absolute;
  left: 0;
  top: 18px;
  width: 22px;
  padding: 4px 0;
  text-align: center;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--dawn);
  background: var(--ink-950);
}

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

.page-about .stage__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage__summary::marker {
  content: "";
}

.page-about .stage__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--dawn);
  transition: transform 260ms var(--ease), opacity 260ms var(--ease);
}

.page-about .stage__details[open] .stage__summary::after {
  content: "–";
}

.page-about .stage__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  letter-spacing: -0.01em;
  color: var(--cloud);
}

.page-about .stage__flag {
  flex: none;
  padding: 3px 9px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  white-space: nowrap;
}

.page-about .stage__body {
  padding: 0 0 22px;
  max-width: 660px;
}

.page-about .stage__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cloud-soft);
}

/* ---------- 03 团队 ---------- */

.page-about .team-media {
  margin-bottom: 40px;
}

.page-about .team-deck {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: stretch;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--about-panel);
  box-shadow: var(--glow);
  transition: border-color 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-color: rgba(244, 169, 58, 0.52);
  transform: translateY(-2px);
  outline: none;
}

.page-about .team-card__count {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  color: var(--cloud);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card__unit {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .team-card__role {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--dawn);
}

.page-about .team-card__desc {
  margin: auto 0 0;
  padding-top: 12px;
  font-size: 14px;
  line-height: 1.76;
  color: var(--cloud-soft);
  border-top: 1px solid var(--line);
}

/* ---------- 04 数据来源 ---------- */

.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 38px;
}

.page-about .reach-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .reach-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 20px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .reach-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .reach-step__num {
  padding-top: 5px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--dawn);
}

.page-about .reach-step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--cloud);
}

.page-about .reach-step p {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cloud-soft);
}

.page-about .reach-side {
  align-self: start;
  padding: 24px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(24, 39, 71, 0.62), rgba(5, 10, 24, 0.36));
  box-shadow: var(--glow);
}

.page-about .reach-side__title {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--dawn);
}

.page-about .refresh-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .refresh-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .refresh-list li:last-child {
  border-bottom: none;
}

.page-about .refresh-list__key {
  font-size: 14px;
  color: var(--mist);
}

.page-about .refresh-list__val {
  font-size: 15px;
  color: var(--cloud);
  white-space: nowrap;
}

.page-about .reach-side__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 05 合作生态 ---------- */

.page-about .partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .partners-copy .prose p + p {
  margin-top: 16px;
}

.page-about .partner-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .partner-stats li {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-stats__num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--dawn);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-stats__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--cloud-soft);
}

/* ---------- 06 坚持的事 ---------- */

.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .principle {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 22px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .principle:first-child {
  border-top: 1px solid var(--line);
}

.page-about .principle__num {
  padding-top: 6px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .principle h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--cloud);
}

.page-about .principle p {
  grid-column: 2;
  margin: 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cloud-soft);
}

/* ---------- 收束 ---------- */

.page-about .about-outro {
  position: relative;
  padding: clamp(62px, 12vh, 132px) 0 clamp(84px, 15vh, 172px);
  overflow: hidden;
}

.page-about .about-outro::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  top: 34%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(244, 169, 58, 0.42) 32%, rgba(147, 164, 195, 0.1) 70%, transparent);
  transform: rotate(-3.4deg);
  pointer-events: none;
}

.page-about .about-outro__inner {
  position: relative;
  max-width: 660px;
}

.page-about .about-outro h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--cloud);
}

.page-about .about-outro p {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.82;
  color: var(--cloud-soft);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .team-deck {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    align-items: end;
  }

  .page-about .team-card:nth-child(1) {
    min-height: 244px;
  }

  .page-about .team-card:nth-child(2) {
    min-height: 304px;
  }

  .page-about .team-card:nth-child(3) {
    min-height: 214px;
  }

  .page-about .team-card:nth-child(4) {
    min-height: 276px;
  }

  .page-about .stage:nth-child(2) .stage__details {
    margin-left: 20px;
  }

  .page-about .stage:nth-child(3) .stage__details {
    margin-left: 40px;
  }

  .page-about .stage:nth-child(4) .stage__details {
    margin-left: 60px;
  }
}

@media (min-width: 880px) {
  .page-about .who-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 60px;
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 58px;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 54px;
    align-items: center;
  }

  .page-about .principle {
    gap: 6px 40px;
    padding: 26px 0;
  }

  .page-about .stage {
    padding-left: 78px;
  }

  .page-about .stage-track::before {
    left: 11px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: clamp(40px, 7vh, 76px);
  }

  .page-about .about-hero h1 {
    max-width: 17ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-index__list a,
  .page-about .stage__summary::after {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-visible {
    transform: none;
  }
}