.page-about {
  --about-rail-w: 150px;
  display: block;
  background: var(--ink);
  color: var(--body-text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3.5vw, 40px) 0 clamp(38px, 6vw, 74px);
  border-bottom: 1px solid var(--steel);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -6% auto -6%;
  height: 130%;
  background:
    radial-gradient(closest-side at 84% 12%, rgba(22, 224, 224, 0.16), transparent 70%),
    radial-gradient(closest-side at 4% 94%, rgba(198, 255, 61, 0.09), transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  position: relative;
}

.page-about .about-hero__kicker {
  margin: 18px 0 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--body-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 班底概览面板 */
.page-about .about-board {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--steel);
  border-top: 2px solid var(--cyan);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .about-board::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, transparent 50%, rgba(22, 224, 224, 0.18) 50%);
  pointer-events: none;
}

.page-about .about-board__head {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .about-board__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-board__list .field-row {
  border-bottom: 1px solid var(--steel);
}

.page-about .about-board__list .field-row:last-child {
  border-bottom: 0;
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-scroll {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2vw, 28px);
  padding-top: clamp(24px, 3.6vw, 48px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-rail {
  border-top: 1px solid var(--steel);
  border-bottom: 1px solid var(--steel);
  padding: 10px 0;
}

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

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 6px 10px;
  border: 1px solid var(--steel);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(22, 224, 224, 0.08);
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(34px, 5.4vw, 68px) 0;
  border-top: 1px solid var(--steel);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: clamp(20px, 3vw, 36px);
}

.page-about .chapter-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 34px);
  padding-left: clamp(12px, 1.8vw, 20px);
  border-left: 3px solid var(--cyan);
}

.page-about .chapter-head__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .chapter-head__title {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .chapter-head__note {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-texture {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
  border: 1px solid var(--steel);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-texture .figure__img {
  display: block;
  width: 100%;
  height: clamp(110px, 17vw, 190px);
  object-fit: cover;
  opacity: 0.5;
  filter: saturate(0.7);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
  max-width: 68ch;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--steel) 55%, transparent);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.12);
}

.page-about .timeline__era {
  display: inline-block;
  margin: 0 0 8px;
  padding: 3px 9px;
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.34;
  color: var(--white);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
}

/* ---------- 02 团队 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .team-unit {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--steel);
  padding: clamp(18px, 2.6vw, 28px);
  overflow: hidden;
}

.page-about .team-unit::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), transparent 78%);
}

.page-about .team-unit__count {
  margin: 0;
  font-size: clamp(40px, 6vw, 62px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .team-unit__name {
  margin: 10px 0 8px;
  font-family: var(--display);
  font-size: clamp(19px, 2.2vw, 23px);
  color: var(--white);
}

.page-about .team-unit__text {
  margin: 0 0 14px;
  font-size: 15.5px;
}

.page-about .team-unit__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .team-unit__meta li {
  padding: 4px 9px;
  border: 1px solid var(--steel);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .team-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
  border: 1px solid var(--steel);
  overflow: hidden;
  background: var(--panel);
}

.page-about .team-figure .figure__img {
  display: block;
  width: 100%;
  height: clamp(180px, 32vw, 380px);
  object-fit: cover;
}

.page-about .role-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .role-card {
  background: var(--panel);
  border: 1px solid var(--steel);
  padding: 16px 18px;
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.page-about .role-card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .role-card__name {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
}

.page-about .role-card__meta {
  margin: 5px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .role-card__detail {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--body-text);
  transition: max-height 0.3s ease, opacity 0.22s ease, margin-top 0.3s ease;
}

/* ---------- 03 生产节奏 ---------- */
.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .cadence__item {
  background: var(--deep);
  padding: clamp(18px, 2.6vw, 26px);
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .cadence__time {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--lime);
}

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

.page-about .cadence__title {
  margin: 0;
  font-family: var(--display);
  font-size: 18px;
  color: var(--white);
}

.page-about .cadence__text {
  margin: 0;
  font-size: 15px;
}

/* ---------- 04 覆盖 ---------- */
.page-about .sport-matrix {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .sport-matrix__cell {
  background: var(--panel);
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.18s ease;
}

.page-about .sport-matrix__cell:hover {
  background: var(--deep);
}

.page-about .sport-matrix__num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .sport-matrix__name {
  font-family: var(--display);
  font-weight: 700;
  font-size: 15px;
  color: var(--white);
}

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .about-stats .stat {
  background: var(--ink);
  padding: 15px 13px;
}

.page-about .coverage-note {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: 15px;
}

.page-about .coverage-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--steel);
  overflow: hidden;
  background: var(--panel);
}

.page-about .coverage-figure .figure__img {
  display: block;
  width: 100%;
  height: clamp(180px, 26vw, 300px);
  object-fit: cover;
  opacity: 0.72;
}

/* ---------- 05 质量标准 ---------- */
.page-about .checklist {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .checklist__item {
  background: var(--ink);
  padding: clamp(16px, 2.4vw, 24px);
  display: grid;
  gap: 6px;
  align-content: start;
  transition: background 0.18s ease;
}

.page-about .checklist__item:hover {
  background: var(--panel);
}

.page-about .checklist__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .checklist__title {
  margin: 0;
  font-family: var(--display);
  font-size: 18px;
  color: var(--white);
}

.page-about .checklist__text {
  margin: 0;
  font-size: 15px;
}

.page-about .standard-fields {
  padding-left: clamp(14px, 2vw, 22px);
  border-left: 3px solid var(--cyan);
}

.page-about .standard-fields__title {
  margin: 0 0 10px;
  font-family: var(--display);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .standard-fields__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--steel);
}

.page-about .standard-fields__list .field-row {
  border-bottom: 1px solid var(--steel);
}

/* ---------- 06 合作与荣誉 ---------- */
.page-about .about-chapter--narrow .chapter-head,
.page-about .about-chapter--narrow .partner-wall,
.page-about .about-chapter--narrow .honor {
  max-width: 46rem;
}

.page-about .partner-wall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .partner-wall__item {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--steel);
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.page-about .partner-wall__item:hover {
  border-color: var(--cyan);
  background: var(--deep);
  transform: translateY(-2px);
}

.page-about .partner-wall__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .partner-wall__meta {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .partner-wall__item:hover .partner-wall__meta {
  color: var(--lime);
}

.page-about .honor {
  margin-top: clamp(20px, 3vw, 30px);
  padding: 16px 0 0;
  border-top: 1px solid var(--steel);
}

.page-about .honor__label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .honor__text {
  margin: 0;
  font-size: 15.5px;
  color: var(--white);
}

/* ---------- 07 加入与合作 ---------- */
.page-about .join-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

.page-about .join-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
  border: 1px solid var(--steel);
  border-bottom: 3px solid var(--cyan);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .join-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .join-card__tag {
  align-self: flex-start;
}

.page-about .join-card__title {
  margin: 0;
  font-family: var(--display);
  font-size: 19px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .join-card__text {
  margin: 0;
  font-size: 15px;
  word-break: break-word;
}

.page-about .join-card__link {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .join-card__link:hover,
.page-about .join-card__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding: clamp(34px, 5vw, 66px) 0;
  background: var(--deep);
  border-top: 1px solid var(--steel);
  border-bottom: 1px solid var(--steel);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 14px;
  max-width: 46rem;
}

.page-about .about-cta__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 60ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .team-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .sport-matrix {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

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

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

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

  .page-about .role-card__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
  }

  .page-about .role-card:hover .role-card__detail {
    max-height: 200px;
    margin-top: 10px;
    opacity: 1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-scroll {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    border: 0;
    padding: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 2px solid var(--steel);
    justify-content: flex-start;
    background: transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: transparent;
    color: var(--white);
  }

  .page-about .sport-matrix {
    grid-template-columns: repeat(9, minmax(0, 1fr));
  }

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

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}