.page-about {
  display: block;
  background: var(--ink);
  color: var(--white);
  --about-gap: clamp(64px, 8vw, 104px);
  --about-orange-soft: rgba(255, 122, 26, .16);
  --about-cyan-soft: rgba(43, 227, 199, .14);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 34px) 0 clamp(56px, 7vw, 92px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  left: -20%;
  width: 94%;
  height: 122%;
  background: linear-gradient(128deg, var(--navy) 0%, var(--mid) 52%, rgba(11, 43, 91, 0) 94%);
  transform: rotate(-5deg);
  border-radius: 0 0 46% 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -34%;
  width: 48%;
  height: 76%;
  background: linear-gradient(180deg, rgba(255, 122, 26, .26), rgba(255, 122, 26, 0) 76%);
  transform: rotate(-9deg);
  border-radius: 42% 0 0 0;
  z-index: 0;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  margin-top: 30px;
}

.page-about .about-hero__title {
  margin: 16px 0 22px;
  max-width: 17ch;
}

.page-about .about-hero__lede {
  max-width: 60ch;
  color: var(--white);
  opacity: .92;
}

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

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 20px;
  background: rgba(6, 15, 30, .74);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--white);
  background: linear-gradient(180deg, var(--white) 30%, var(--orange-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-stat:nth-child(3) .about-stat__num,
.page-about .about-stat:nth-child(4) .about-stat__num {
  background: linear-gradient(180deg, var(--white) 30%, var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .about-stat__label {
  color: var(--mist);
}

/* ---------- 章节页码导航 ---------- */
.page-about .about-pager {
  display: none;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--hairline);
}

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

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

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

.page-about .about-chapter__index {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(46px, 7vw, 84px);
  line-height: .88;
  letter-spacing: -.02em;
  color: rgba(143, 163, 191, .34);
  -webkit-text-stroke: 1px var(--hairline-strong);
  margin-bottom: 14px;
}

.page-about .about-chapter h2 {
  margin: 0 0 20px;
  max-width: 20ch;
}

.page-about .about-chapter .prose {
  margin: 0 0 16px;
  color: rgba(244, 247, 251, .84);
}

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

.page-about .about-figure {
  margin: 22px 0 0;
}

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

/* ---------- 01 赛季阶梯 ---------- */
.page-about .about-chain__cap {
  color: var(--mist);
  margin: 0 0 14px;
}

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

.page-about .season-ladder__step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) minmax(0, auto);
  align-items: center;
  gap: 14px;
  padding: 11px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  background: rgba(11, 43, 91, .34);
  transition: border-color .28s var(--ease), background-color .28s var(--ease), transform .28s var(--ease);
}

.page-about .season-ladder__step:hover,
.page-about .season-ladder__step:focus-within {
  border-color: var(--cyan);
  background: rgba(18, 58, 115, .62);
  transform: translateX(5px);
}

.page-about .season-ladder__tag {
  color: var(--mist);
  transition: color .28s var(--ease);
}

.page-about .season-ladder__step:hover .season-ladder__tag,
.page-about .season-ladder__step:focus-within .season-ladder__tag {
  color: var(--cyan);
}

.page-about .season-ladder__bar {
  display: block;
  height: 8px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--navy), var(--mid));
  transition: background .28s var(--ease);
}

.page-about .season-ladder__step:nth-child(1) .season-ladder__bar { width: 26%; }
.page-about .season-ladder__step:nth-child(2) .season-ladder__bar { width: 37%; }
.page-about .season-ladder__step:nth-child(3) .season-ladder__bar { width: 48%; }
.page-about .season-ladder__step:nth-child(4) .season-ladder__bar { width: 58%; }
.page-about .season-ladder__step:nth-child(5) .season-ladder__bar { width: 68%; }
.page-about .season-ladder__step:nth-child(6) .season-ladder__bar { width: 79%; }
.page-about .season-ladder__step:nth-child(7) .season-ladder__bar { width: 89%; }
.page-about .season-ladder__step:nth-child(8) .season-ladder__bar { width: 100%; }

.page-about .season-ladder__step:hover .season-ladder__bar,
.page-about .season-ladder__step:focus-within .season-ladder__bar {
  background: var(--grad-pass);
}

.page-about .season-ladder__meta {
  font-size: 13px;
  color: var(--white);
  white-space: nowrap;
}

/* ---------- 02 接力链 ---------- */
.page-about .crew-chain {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crew-chain__item {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  background: rgba(18, 58, 115, .42);
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--white);
  transition: border-color .25s var(--ease), color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .crew-chain__item:nth-child(1) { border-color: rgba(255, 122, 26, .58); }
.page-about .crew-chain__item:nth-child(2) { border-color: rgba(43, 227, 199, .5); }
.page-about .crew-chain__item:nth-child(3) { border-color: rgba(143, 163, 191, .52); }

.page-about .crew-chain__item:not(:last-child)::after {
  content: "→";
  margin-left: 10px;
  color: var(--mist);
  font-family: var(--font-num);
  letter-spacing: 0;
}

.page-about .crew-chain__item:hover {
  border-color: var(--orange);
  color: var(--orange-light);
  background: var(--about-orange-soft);
}

/* ---------- 03 字段面板 ---------- */
.page-about .field-panel {
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(11, 43, 91, .72), rgba(6, 15, 30, .72));
  padding: 8px;
  display: grid;
  gap: 2px;
}

.page-about .field-panel__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  align-items: baseline;
  gap: 14px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  transition: background-color .25s var(--ease);
}

.page-about .field-panel__row:hover {
  background: rgba(43, 227, 199, .08);
}

.page-about .field-panel__row--lead {
  background: rgba(255, 122, 26, .09);
  border-left: 2px solid var(--orange);
}

.page-about .field-panel__row--lead:hover {
  background: rgba(255, 122, 26, .16);
}

.page-about .field-panel__key {
  color: var(--white);
}

.page-about .field-panel__row--lead .field-panel__key {
  color: var(--orange-light);
}

.page-about .field-panel__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .field-panel__note {
  margin: 8px 6px 6px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 04 青训列表 ---------- */
.page-about .academy-list {
  display: grid;
  gap: 2px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--hairline);
}

.page-about .academy-row {
  background: rgba(6, 15, 30, .82);
}

.page-about .academy-row__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 22px;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  transition: background-color .25s var(--ease);
}

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

.page-about .academy-row__head:hover {
  background: rgba(18, 58, 115, .52);
}

.page-about .academy-row__code {
  color: var(--cyan);
}

.page-about .academy-row__title {
  font-size: 15px;
  color: var(--white);
}

.page-about .academy-row__toggle {
  position: relative;
  width: 14px;
  height: 14px;
  justify-self: end;
}

.page-about .academy-row__toggle::before,
.page-about .academy-row__toggle::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 1.5px;
  background: var(--mist);
  transition: transform .25s var(--ease), background-color .25s var(--ease);
}

.page-about .academy-row__toggle::after {
  transform: rotate(90deg);
}

.page-about .academy-row[open] .academy-row__toggle::after {
  transform: rotate(0deg);
}

.page-about .academy-row[open] .academy-row__toggle::before,
.page-about .academy-row[open] .academy-row__toggle::after {
  background: var(--orange);
}

.page-about .academy-row__body {
  margin: 0;
  padding: 0 18px 20px 18px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .76);
  border-top: 1px solid var(--hairline);
  padding-top: 16px;
}

/* ---------- 05 纠错流程 ---------- */
.page-about .fix-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .fix-flow__step {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--hairline);
}

.page-about .fix-flow__step:first-child {
  border-top: 0;
  padding-top: 0;
}

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

.page-about .fix-flow__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--orange);
}

.page-about .fix-flow__body {
  min-width: 0;
}

.page-about .fix-flow__title {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--white);
}

.page-about .fix-flow__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 06 收束 ---------- */
.page-about .about-closing {
  border-top: 0;
}

.page-about .about-closing__title {
  margin-bottom: 28px;
}

.page-about .about-quote {
  margin: 0;
  padding: clamp(24px, 3vw, 40px) clamp(24px, 3.4vw, 46px);
  background: var(--paper);
  color: var(--ink);
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.page-about .about-quote p {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: #1d2a3c;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__grid {
    margin-top: 38px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-chapter__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 36px clamp(28px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-chapter__copy {
    grid-column: 1 / span 5;
  }

  .page-about .about-chapter__visual {
    grid-column: 7 / span 6;
  }

  .page-about .about-figure {
    margin-top: 26px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: end;
    gap: clamp(40px, 5vw, 84px);
  }

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

@media (min-width: 1400px) {
  .page-about .about-pager {
    display: flex;
    flex-direction: column;
    gap: 6px;
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: 30;
  }

  .page-about .about-pager__item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    text-decoration: none;
    transition: border-color .25s var(--ease), background-color .25s var(--ease);
  }

  .page-about .about-pager__item:hover,
  .page-about .about-pager__item:focus-visible {
    border-color: var(--hairline-strong);
    background: rgba(11, 43, 91, .72);
  }

  .page-about .about-pager__num {
    font-family: var(--font-num);
    font-variant-numeric: tabular-nums;
    font-size: 13px;
    font-weight: 700;
    color: var(--mist);
    transition: color .25s var(--ease);
  }

  .page-about .about-pager__item:hover .about-pager__num {
    color: var(--orange);
  }

  .page-about .about-pager__name {
    font-family: var(--font-label);
    font-size: 11px;
    letter-spacing: .08em;
    color: var(--mist);
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity .25s var(--ease), transform .25s var(--ease);
  }

  .page-about .about-pager__item:hover .about-pager__name,
  .page-about .about-pager__item:focus-visible .about-pager__name {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (max-width: 560px) {
  .page-about .season-ladder__step {
    grid-template-columns: 38px minmax(0, 1fr);
    row-gap: 6px;
    border-radius: var(--radius-md);
  }

  .page-about .season-ladder__meta {
    grid-column: 2;
    white-space: normal;
    font-size: 12.5px;
  }

  .page-about .field-panel__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .fix-flow__step {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-ladder__step,
  .page-about .season-ladder__bar,
  .page-about .crew-chain__item,
  .page-about .academy-row__head,
  .page-about .academy-row__toggle::before,
  .page-about .academy-row__toggle::after,
  .page-about .about-pager__item,
  .page-about .about-pager__num,
  .page-about .about-pager__name {
    transition: none;
  }

  .page-about .season-ladder__step:hover,
  .page-about .season-ladder__step:focus-within {
    transform: none;
  }
}