.page-about {
  --about-gap: clamp(36px, 6vw, 78px);
  --about-card-shadow: 5px 5px 0 rgba(10, 28, 23, 0.5);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 var(--about-gap);
  border-bottom: 1px solid var(--line);
  background-image: repeating-radial-gradient(circle at 8% 130%, rgba(34, 224, 196, 0.06) 0 1px, transparent 1px 44px);
  overflow: hidden;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 26px;
}

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

.page-about .about-hero__lead .h-xl {
  margin: 10px 0 18px;
}

.page-about .about-hero__lead .lede {
  max-width: 40em;
  margin: 0;
}

.page-about .about-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .mark {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--line);
  background: rgba(242, 234, 217, 0.06);
  color: var(--paper);
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* 章节入口 */
.page-about .about-index {
  border: 1px solid var(--line);
  background: var(--ink-mid);
  padding: 16px 18px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 8px;
  border-left: 2px solid transparent;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.5;
  transition: color 140ms var(--ease-out), border-color 140ms var(--ease-out), background-color 140ms var(--ease-out);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--amber);
  background: rgba(34, 224, 196, 0.07);
}

.page-about .about-index__num {
  font-family: var(--font-data);
  font-size: 0.74rem;
  color: var(--amber);
  letter-spacing: 0.06em;
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: var(--about-gap) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-block:last-of-type {
  border-bottom: 0;
}

.page-about .block-head {
  margin-bottom: 26px;
}

.page-about .block-head .h-lg {
  margin: 10px 0 12px;
}

.page-about .block-head .lede {
  max-width: 42em;
  margin: 0;
}

.page-about .prose p {
  margin: 0 0 1em;
}

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

.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-mid);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--inset {
  margin-top: 34px;
}

.page-about .about-figure .media__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}

/* ---------- 01 专注方向 ---------- */
.page-about .focus-grid {
  display: grid;
  gap: 8px;
}

.page-about .pull {
  margin: 24px 0 0;
  padding-left: 18px;
  border-left: 4px solid var(--amber);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.2rem, 3.6vw, 1.95rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

/* ---------- 02 赛区 ---------- */
.page-about .region-strip {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .region {
  align-self: start;
  position: relative;
  padding: 20px 18px 18px;
  background: var(--ink-mid);
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  transition: transform 140ms var(--ease-out), box-shadow 140ms var(--ease-out), border-color 140ms var(--ease-out);
}

.page-about .region:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .region:nth-child(3) {
  border-top-color: var(--press);
}

.page-about .region:hover,
.page-about .region:focus-within {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.36);
  border-color: var(--cyan);
}

.page-about .region:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-about .region__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .region .h-sm {
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .region p {
  margin: 0 0 14px;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .region__list {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 8px;
  max-height: none;
  opacity: 1;
  overflow: hidden;
  font-family: var(--font-data);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .region__list li {
  position: relative;
  padding-left: 14px;
}

.page-about .region__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 2px;
  background: var(--cyan);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .region__list {
    max-height: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
    transition: max-height 300ms var(--ease-out), opacity 240ms var(--ease-out), padding-top 300ms var(--ease-out), border-color 300ms var(--ease-out);
  }

  .page-about .region:hover .region__list,
  .page-about .region:focus-within .region__list {
    max-height: 18rem;
    padding-top: 12px;
    border-top-color: var(--line);
    opacity: 1;
  }
}

/* ---------- 03 团队 ---------- */
.page-about .team-table {
  display: grid;
  gap: 14px;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px;
  background: var(--paper);
  color: var(--charcoal);
  border: 1px solid var(--paper-2);
  box-shadow: var(--about-card-shadow);
}

.page-about .team-row__role {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--charcoal);
}

.page-about .team-row__count {
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--press);
}

.page-about .team-row__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--charcoal);
}

/* ---------- 04 版本 ---------- */
.page-about .timeline {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}

.page-about .tl-item {
  position: relative;
  padding: 22px 18px 20px;
  background: var(--ink-soft);
  border: 1px solid var(--line);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 46px;
  height: 3px;
  background: var(--cyan);
}

.page-about .tl-item:nth-child(2)::before {
  background: var(--amber);
}

.page-about .tl-item:nth-child(3)::before {
  background: var(--press);
}

.page-about .tl-item__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.page-about .tl-item .h-sm {
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 05 节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cadence__item {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cadence__num {
  font-family: var(--font-data);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .cadence__text {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: 26px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(34, 224, 196, 0.1), rgba(255, 154, 60, 0.08));
}

.page-about .about-cta .h-md {
  margin: 0 0 12px;
}

.page-about .about-cta .prose {
  max-width: 42em;
  margin: 0;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding-top: 30px;
  }

  .page-about .region-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .region:nth-child(2) {
    margin-top: 38px;
  }

  .page-about .region:nth-child(3) {
    margin-top: 76px;
  }

  .page-about .team-row {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.42fr) minmax(0, 1.9fr);
    gap: 20px;
    align-items: start;
    padding: 20px 22px;
  }

  .page-about .team-row:nth-child(2) {
    margin-left: 18px;
  }

  .page-about .team-row:nth-child(3) {
    margin-left: 36px;
  }

  .page-about .cadence__item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 26px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.62fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .focus-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.62fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .pull {
    margin-top: 6px;
  }
}

@media (min-width: 860px) {
  .page-about .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .tl-item:nth-child(2) {
    transform: translateY(30px);
  }

  .page-about .tl-item:nth-child(3) {
    transform: translateY(60px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region,
  .page-about .region__list,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .region:hover,
  .page-about .region:focus-within,
  .page-about .tl-item:nth-child(2),
  .page-about .tl-item:nth-child(3) {
    transform: none;
  }
}