/* ===== 关于我们 · 页面专属样式 ===== */
.page-about {
  --about-axis: 104px;
  background: var(--bg);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 116px 0 40px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -14%;
  width: min(760px, 88%);
  height: 460px;
  background: linear-gradient(155deg, rgba(20, 224, 198, 0.17) 0%, rgba(20, 224, 198, 0) 68%);
  clip-path: polygon(18% 0, 100% 0, 100% 74%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 8%;
  top: 300px;
  width: 96px;
  height: 3px;
  background: var(--grad-cyan);
  pointer-events: none;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: 26px;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--grad-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-mute);
}

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

.page-about .about-hero__board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__cell {
  background: var(--bg-panel);
  padding: 18px 16px 20px;
}

.page-about .about-hero__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-hero__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}

/* ---------- 章节跳转条 ---------- */
.page-about .about-index {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 10px;
  margin-top: 8px;
  padding: 26px 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-mute);
  font-size: 14px;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--cyan);
  background: var(--cyan-dim);
  color: var(--ink);
}

/* ---------- 长卷章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: 62px 0;
}

.page-about .chapter:first-of-type {
  padding-top: 44px;
}

.page-about .chapter__head {
  display: grid;
  gap: 14px;
  max-width: 780px;
  margin-bottom: 34px;
}

.page-about .chapter__index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.page-about .chapter__lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-mute);
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  margin: 0 0 34px;
}

.page-about .about-media .media__frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-panel);
}

.page-about .about-media .media__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-media .media__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 11, 20, 0) 40%, rgba(6, 11, 20, 0.62) 100%);
  pointer-events: none;
}

.page-about .about-media .media__cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.page-about .about-media--eco {
  margin: 34px 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 22px;
  padding-left: 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: var(--grad-cyan);
  opacity: 0.5;
}

.page-about .stage {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px var(--cyan-dim);
}

.page-about .stage:hover,
.page-about .stage:focus-within {
  border-color: rgba(20, 224, 198, 0.45);
  box-shadow: 0 0 0 1px rgba(20, 224, 198, 0.08);
}

.page-about .stage__when {
  display: inline-block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .stage__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.42;
}

.page-about .stage__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-mute);
}

.page-about .stage__points {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stage__points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.page-about .stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--cyan);
  opacity: 0.85;
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 26px;
}

.page-about .about-media--side {
  margin: 0;
}

.page-about .roles {
  display: grid;
  gap: 14px;
}

.page-about .role {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  transition: border-color 0.2s var(--ease);
}

.page-about .role[open] {
  border-color: rgba(20, 224, 198, 0.42);
}

.page-about .role__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .role__summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 15px;
  color: var(--ink-mute);
}

.page-about .role[open] .role__summary::after {
  content: "－";
  color: var(--cyan);
}

.page-about .role__count {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .role__name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .role__text {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

/* ---------- 数据节奏 ---------- */
.page-about .pace {
  display: grid;
  gap: 14px;
}

.page-about .pace__item {
  position: relative;
  overflow: hidden;
  padding: 24px 18px 24px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .pace__item::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--grad-cyan);
}

.page-about .pace__item:nth-child(2)::before {
  background: linear-gradient(90deg, var(--cyan-soft) 0%, var(--cyan) 100%);
}

.page-about .pace__item:nth-child(3)::before {
  background: linear-gradient(90deg, var(--cyan) 0%, var(--amber) 100%);
}

.page-about .pace__step {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .pace__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.page-about .pace__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

.page-about .sources {
  display: grid;
  gap: 16px;
  margin-top: 20px;
  padding: 22px 20px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .sources__figures {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
}

.page-about .sources__figure {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .sources__num {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .sources__unit {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}

.page-about .sources__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

/* ---------- 内容更新 ---------- */
.page-about .cadence {
  display: grid;
  gap: 14px;
}

.page-about .cadence__item {
  padding: 22px 20px 24px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .cadence__tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .cadence__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .cadence__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

.page-about .cadence__more {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-mute);
}

.page-about .cadence__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 224, 198, 0.4);
}

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

/* ---------- 合作生态 ---------- */
.page-about .chapter--eco {
  padding-bottom: 40px;
}

.page-about .eco {
  display: grid;
  gap: 30px;
}

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

.page-about .eco__ring {
  display: block;
  width: min(300px, 76%);
  margin: 0 auto;
  height: auto;
}

.page-about .eco__figure-cap {
  margin: 12px 0 0;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}

.page-about .eco__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__item {
  padding: 16px 18px 18px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease);
}

.page-about .eco__item:hover {
  border-color: rgba(20, 224, 198, 0.4);
}

.page-about .eco__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .eco__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-mute);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: 48px 0 76px;
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-mute);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 150px 0 56px;
  }

  .page-about .about-hero::after {
    top: 360px;
    width: 140px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .chapter {
    padding: 88px 0;
  }

  .page-about .chapter:first-of-type {
    padding-top: 64px;
  }

  .page-about .timeline {
    gap: 26px;
    padding-left: 0;
  }

  .page-about .timeline::before {
    left: var(--about-axis);
  }

  .page-about .stage {
    margin-left: calc(var(--about-axis) + 28px);
    padding: 24px 24px 26px;
  }

  .page-about .stage::before {
    left: -33px;
    top: 30px;
  }

  .page-about .stage__when {
    position: absolute;
    left: calc(-1 * (var(--about-axis) + 28px));
    top: 26px;
    width: calc(var(--about-axis) - 18px);
    margin: 0;
    text-align: right;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .about-media--side .media__frame {
    position: sticky;
    top: 104px;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: center;
    gap: 56px;
  }

  .page-about .eco__ring {
    width: min(340px, 100%);
  }

  .page-about .about-media--eco {
    margin-top: 48px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__cell {
    padding: 22px 20px 24px;
  }

  .page-about .about-hero__num {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .stage,
  .page-about .role,
  .page-about .eco__item {
    transition: none;
  }
}