.page-about {
  --about-rail: 132px;
  --about-gap: 32px;
  color: var(--white);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  padding-top: calc(var(--gutter) * 2);
  padding-bottom: calc(var(--gutter) * 2.5);
  background:
    linear-gradient(168deg, var(--ink-900) 0%, var(--ink-800) 58%, var(--ink-700) 100%);
  position: relative;
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: -8%;
  width: 52%;
  height: 100%;
  background: linear-gradient(115deg, transparent 38%, rgba(0, 229, 176, 0.07) 38.4%, rgba(0, 229, 176, 0.07) 40%, transparent 40.4%);
  pointer-events: none;
}
.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}
.page-about .breadcrumb {
  margin-bottom: 48px;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 76px);
  line-height: 1.08;
  letter-spacing: 0.03em;
  margin: 14px 0 26px;
  max-width: 16ch;
}
.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--white);
  max-width: 680px;
  margin: 0 0 16px;
}
.page-about .about-hero__lead--dim {
  color: var(--muted);
  font-size: 15px;
}
.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: end;
}
.page-about .about-fact {
  background: var(--ink-800);
  padding: 20px 16px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.02em;
  line-height: 1;
}
.page-about .about-fact__label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-top: calc(var(--gutter) * 2.2);
  padding-bottom: calc(var(--gutter) * 2.2);
}
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-about .about-chapter__marker {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--teal);
  text-transform: uppercase;
  white-space: nowrap;
}
.page-about .about-chapter__line {
  flex: 1;
  height: 1px;
  background: var(--line);
}
.page-about .about-chapter__body {
  max-width: 720px;
}
.page-about .about-chapter__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  margin: 0 0 22px;
  color: var(--white);
}
.page-about .about-chapter__body p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--white);
  margin: 0 0 18px;
}
.page-about .about-chapter__lede {
  font-size: 18px !important;
  color: var(--teal-soft) !important;
  border-left: 2px solid var(--teal);
  padding-left: 18px;
  margin-bottom: 26px !important;
}
.page-about .about-link {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 176, 0.35);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--teal-soft);
  border-bottom-color: var(--teal-soft);
}
.page-about .about-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--ink-600);
  font-size: 15px !important;
  line-height: 1.75 !important;
  color: var(--muted) !important;
}
.page-about .about-note--teal {
  border-left: 3px solid var(--teal);
}
.page-about .about-note--signal {
  border-left: 3px solid var(--orange);
}
.page-about .about-note__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--teal);
  margin-right: 10px;
  text-transform: uppercase;
}
.page-about .about-note--signal .about-note__tag {
  color: var(--orange);
}

/* ---------- 时间轴列表 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease);
}
.page-about .about-timeline__item:hover {
  background: var(--ink-600);
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: 0.04em;
  padding-top: 3px;
}
.page-about .about-timeline__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
  color: var(--white);
}
.page-about .about-timeline__content p {
  margin: 0 !important;
  font-size: 15px !important;
  color: var(--muted) !important;
  line-height: 1.75 !important;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 30px;
}
.page-about .about-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 青训流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-steps__item {
  background: var(--ink-700);
  padding: 20px 20px 22px;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .about-steps__item:hover {
  background: var(--ink-600);
  box-shadow: inset 0 0 0 1px var(--teal);
}
.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
  display: block;
  margin-bottom: 10px;
}
.page-about .about-steps__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin: 0 0 8px;
  color: var(--white);
}
.page-about .about-steps__item p {
  margin: 0 !important;
  font-size: 15px !important;
  color: var(--muted) !important;
  line-height: 1.75 !important;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 30px;
}
.page-about .about-donut {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.page-about .about-donut__svg {
  width: 200px;
  height: 200px;
  display: block;
}
.page-about .about-donut__value {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  fill: var(--white);
}
.page-about .about-donut__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--muted);
  letter-spacing: 0.12em;
}
.page-about .about-donut__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .about-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-roster__item {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  grid-template-areas:
    "swatch name count"
    "swatch desc desc";
  align-items: baseline;
  gap: 4px 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-roster__swatch {
  grid-area: swatch;
  width: 10px;
  height: 10px;
  align-self: start;
  margin-top: 6px;
  background: var(--teal);
}
.page-about .about-roster__swatch[data-kind="video"] { background: var(--teal-soft); }
.page-about .about-roster__swatch[data-kind="ops"] { background: var(--orange); }
.page-about .about-roster__swatch[data-kind="member"] { background: var(--muted); }
.page-about .about-roster__name {
  grid-area: name;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--white);
}
.page-about .about-roster__count {
  grid-area: count;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--teal);
}
.page-about .about-roster__desc {
  grid-area: desc;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- 合作方数字 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 28px;
}
.page-about .about-partners__cell {
  background: var(--ink-600);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 48px);
  font-weight: 700;
  color: var(--teal);
  line-height: 1;
  letter-spacing: 0.02em;
}
.page-about .about-partners__label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 索引说明表 ---------- */
.page-about .about-index-list {
  margin: 30px 0 0;
  border-top: 1px solid var(--line);
}
.page-about .about-index-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-index-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--teal);
  text-transform: uppercase;
}
.page-about .about-index-list dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--white);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding-top: calc(var(--gutter) * 2.4);
  padding-bottom: calc(var(--gutter) * 2.6);
  background: linear-gradient(200deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-top: 1px solid var(--line);
}
.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: 0.03em;
  margin: 12px 0 18px;
  max-width: 18ch;
}
.page-about .about-cta__text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 52ch;
  margin: 0;
}
.page-about .about-cta__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-cta__item {
  display: grid;
  grid-template-columns: 40px 1fr;
  grid-template-areas:
    "no name"
    "no desc";
  gap: 4px 14px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.page-about .about-cta__item:hover,
.page-about .about-cta__item:focus-visible {
  background: var(--ink-700);
  padding-left: 12px;
}
.page-about .about-cta__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.1em;
  padding-top: 3px;
}
.page-about .about-cta__name {
  grid-area: name;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--white);
}
.page-about .about-cta__desc {
  grid-area: desc;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 焦点 ---------- */
.page-about a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 56px;
  }
  .page-about .about-hero__side {
    grid-template-columns: 1fr;
    align-self: end;
  }
  .page-about .about-fact {
    padding: 22px 22px 24px;
  }
  .page-about .about-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-team {
    grid-template-columns: 220px 1fr;
    align-items: start;
    gap: 36px;
  }
  .page-about .about-partners {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-index-list__row {
    grid-template-columns: 160px 1fr;
    gap: 20px;
    align-items: baseline;
  }
  .page-about .about-cta__grid {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-gap: 48px;
  }
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) 1fr;
    gap: var(--about-gap);
  }
  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 8px;
    position: sticky;
    top: 120px;
    align-self: start;
  }
  .page-about .about-chapter__line {
    width: 1px;
    flex: 0 0 72px;
    height: 72px;
    background: linear-gradient(to bottom, var(--teal), transparent);
  }
  .page-about .about-chapter__title {
    margin-top: -6px;
  }
  .page-about .about-chapter__body {
    max-width: 760px;
  }
  .page-about .about-chapter--index .about-chapter__body {
    max-width: 900px;
  }
  .page-about .about-hero__title {
    font-size: clamp(48px, 5.4vw, 88px);
  }
}