.page-about {
  --about-gap: 40px;
  --about-radius: var(--radius-m);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 48px;
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(46, 155, 181, 0.20), transparent 58%),
    linear-gradient(160deg, var(--c-night) 0%, #0d2039 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: -1px;
  height: 120px;
  background: var(--c-panel);
  opacity: 0.7;
  clip-path: polygon(0 66%, 100% 14%, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .breadcrumbs {
  margin-bottom: 28px;
  font-size: var(--step-2);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(28px, 6.2vw, 52px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--c-text);
  margin: 12px 0 18px;
  max-width: 18em;
}

.page-about .about-hero__text {
  max-width: 34em;
  color: var(--c-muted);
  font-size: var(--step-3);
  line-height: 1.8;
}

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

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: end;
}

.page-about .about-fact {
  padding: 16px 18px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-top: 2px solid var(--c-cyan);
  border-radius: var(--radius-s);
}

.page-about .about-fact:nth-child(2) {
  border-top-color: var(--c-green);
}

.page-about .about-fact:nth-child(3) {
  border-top-color: var(--c-orange);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4.4vw, 28px);
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.2;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: var(--step-2);
  color: var(--c-muted);
}

/* ---------- 主体栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  padding-top: 48px;
  padding-bottom: 64px;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  color: var(--c-muted);
  margin-bottom: 14px;
}

.page-about .about-index__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  list-style: none;
  margin: 0;
  scrollbar-width: thin;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: block;
  padding: 8px 14px;
  font-size: var(--step-2);
  color: var(--c-muted);
  text-decoration: none;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-green-soft);
  border-color: var(--c-green);
  background: rgba(63, 178, 127, 0.10);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 56px;
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.32;
  color: var(--c-text);
  margin: 10px 0 20px;
}

.page-about .about-chapter__lead {
  max-width: 36em;
  color: var(--c-muted);
  margin-bottom: 26px;
}

.page-about .about-chapter__body p {
  max-width: 36em;
  color: var(--c-muted);
  line-height: 1.8;
  margin-bottom: 14px;
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__media {
  margin: 0 0 26px;
}

.page-about .about-chapter__media--inset {
  margin: 30px 0 26px;
}

/* ---------- 斜切时间轴 ---------- */
.page-about .stage-list {
  position: relative;
  margin-top: 8px;
}

.page-about .stage-list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, rgba(46, 155, 181, 0.12) 100%);
}

.page-about .stage {
  position: relative;
  padding-left: 62px;
  margin-bottom: 20px;
  outline: none;
}

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

.page-about .stage__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 700;
  color: var(--c-night);
  background: var(--c-green);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 74% 100%, 0 100%);
}

.page-about .stage__body {
  padding: 18px 20px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  transition: transform 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .stage:hover .stage__body,
.page-about .stage:focus .stage__body,
.page-about .stage:focus-within .stage__body {
  transform: translateY(-6px);
  background: var(--c-raise);
  border-color: rgba(63, 178, 127, 0.45);
}

.page-about .stage__name {
  font-family: var(--font-head);
  font-size: var(--step-4);
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 8px;
}

.page-about .stage__desc {
  color: var(--c-muted);
  line-height: 1.75;
  font-size: var(--step-3);
}

.page-about .stage__note {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  font-size: var(--step-2);
  color: var(--c-cyan-soft);
  line-height: 1.7;
  transition: max-height 0.26s var(--ease), opacity 0.26s var(--ease), margin-top 0.26s var(--ease);
}

.page-about .stage:hover .stage__note,
.page-about .stage:focus .stage__note,
.page-about .stage:focus-within .stage__note {
  max-height: 140px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 团队角色卡 ---------- */
.page-about .role-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .role-card {
  position: relative;
  padding: 20px 20px 20px 24px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  outline: none;
  transition: transform 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .role-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--c-green);
  transform: scaleY(0.22);
  transform-origin: top;
  transition: transform 0.24s var(--ease);
}

.page-about .role-card:hover,
.page-about .role-card:focus,
.page-about .role-card:focus-within {
  transform: translateY(-6px);
  background: var(--c-raise);
  border-color: rgba(63, 178, 127, 0.42);
}

.page-about .role-card:hover::before,
.page-about .role-card:focus::before,
.page-about .role-card:focus-within::before {
  transform: scaleY(1);
}

.page-about .role-card__name {
  font-family: var(--font-head);
  font-size: var(--step-3);
  font-weight: 600;
  color: var(--c-text);
}

.page-about .role-card__num {
  font-family: var(--font-mono);
  font-size: var(--step-5);
  font-weight: 700;
  color: var(--c-green-soft);
  line-height: 1.1;
  margin: 6px 0 10px;
}

.page-about .role-card__num span {
  font-family: var(--font-body);
  font-size: var(--step-2);
  color: var(--c-muted);
  margin-left: 4px;
}

.page-about .role-card__duty {
  font-size: var(--step-2);
  color: var(--c-muted);
  line-height: 1.7;
}

/* ---------- 流程 ---------- */
.page-about .flow-list {
  display: grid;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 20px;
  border-left: 2px solid var(--c-line);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: linear-gradient(90deg, rgba(46, 155, 181, 0.12) 0%, rgba(46, 155, 181, 0) 72%);
  transition: border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .flow-step:hover {
  border-left-color: var(--c-green);
  background: linear-gradient(90deg, rgba(63, 178, 127, 0.14) 0%, rgba(63, 178, 127, 0) 72%);
}

.page-about .flow-step__num {
  font-family: var(--font-mono);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--c-green);
  line-height: 1.3;
}

.page-about .flow-step__name {
  font-family: var(--font-head);
  font-size: var(--step-3);
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 6px;
}

.page-about .flow-step p {
  font-size: var(--step-2);
  color: var(--c-muted);
  line-height: 1.72;
}

/* ---------- 高原区块 ---------- */
.page-about .plateau {
  display: grid;
  gap: 24px;
  align-items: center;
}

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

.page-about .plateau__text p {
  color: var(--c-muted);
  line-height: 1.8;
  margin-bottom: 14px;
}

.page-about .plateau__link {
  margin-top: 20px;
  margin-bottom: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-chapter--closing {
  padding-bottom: 8px;
}

.page-about .trust-panel {
  display: grid;
  gap: 26px;
  padding: 26px 22px;
  background:
    linear-gradient(150deg, rgba(63, 178, 127, 0.10) 0%, rgba(46, 155, 181, 0.06) 46%, transparent 78%),
    var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--about-radius);
}

.page-about .trust-panel__main p {
  color: var(--c-muted);
  line-height: 1.8;
  margin-bottom: 14px;
}

.page-about .trust-panel__main p:last-child {
  margin-bottom: 0;
  color: var(--c-text);
}

.page-about .trust-panel__label {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.16em;
  color: var(--c-muted);
  margin-bottom: 12px;
}

.page-about .trust-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .trust-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--c-line);
}

.page-about .trust-list span {
  font-size: var(--step-2);
  color: var(--c-muted);
}

.page-about .trust-list a {
  font-size: var(--step-3);
  color: var(--c-green-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .trust-list a:hover,
.page-about .trust-list a:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.page-about .trust-panel__hours {
  margin-top: 16px;
  font-size: var(--step-2);
  color: var(--c-muted);
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 56px 0 64px;
  }

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

  .page-about .trust-panel {
    padding: 30px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 72px 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .plateau {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .stage {
    padding-left: 74px;
    margin-bottom: 24px;
  }

  .page-about .stage:nth-child(even) .stage__body {
    margin-left: 44px;
  }

  .page-about .stage:nth-child(3n) .stage__body {
    margin-left: 18px;
  }

  .page-about .about-flow {
    gap: 72px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
    padding-top: 64px;
    padding-bottom: 88px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    border: 0;
    border-left: 2px solid var(--c-line);
    border-radius: 0;
    padding: 10px 12px;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--c-green);
    background: rgba(63, 178, 127, 0.08);
    color: var(--c-green-soft);
  }

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

  .page-about .trust-panel {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 40px;
    padding: 34px 32px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .flow-step {
    grid-template-columns: 54px minmax(0, 1fr);
    padding: 20px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage__body,
  .page-about .stage__note,
  .page-about .role-card,
  .page-about .role-card::before,
  .page-about .flow-step,
  .page-about .about-index__list a,
  .page-about .trust-list a {
    transition-duration: 0.01ms;
  }

  .page-about .stage:hover .stage__body,
  .page-about .stage:focus .stage__body,
  .page-about .stage:focus-within .stage__body,
  .page-about .role-card:hover,
  .page-about .role-card:focus,
  .page-about .role-card:focus-within {
    transform: none;
  }
}