.page-about {
  --rail-w: 196px;
  --season-track-line: rgba(28, 22, 19, 0.16);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-top: clamp(18px, 2.6vw, 34px);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--sage);
}
.page-about .about-crumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--cyan);
}
.page-about .about-crumb__sep {
  color: rgba(28, 22, 19, 0.3);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(22px, 3vw, 40px);
  padding-bottom: clamp(40px, 6vw, 84px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  align-items: end;
}
.page-about .about-hero__copy {
  min-width: 0;
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 5vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--green-deep);
  text-wrap: balance;
}
.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.88;
  color: rgba(28, 22, 19, 0.78);
}
.page-about .about-quick {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-quick__item {
  background: var(--paper);
  padding: 14px 14px 16px;
  min-width: 0;
}
.page-about .about-quick__val {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 27px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--green);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  overflow: hidden;
  background: var(--paper-2);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.66) contrast(1.05);
}
.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(152deg, rgba(14, 59, 50, 0.24), rgba(63, 224, 200, 0.1) 46%, transparent 72%);
  pointer-events: none;
}

/* ---------- 主体骨架：左索引 + 右内容 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 42px);
  padding-bottom: clamp(56px, 8vw, 118px);
  align-items: start;
}
.page-about .about-flow {
  min-width: 0;
}

/* ---------- 赛季索引 ---------- */
.page-about .about-rail {
  border-top: 2px solid var(--green);
  padding-top: 14px;
  min-width: 0;
}
.page-about .about-rail__title {
  margin: 0 0 12px;
  color: var(--sage);
}
.page-about .season-rail {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .season-rail::-webkit-scrollbar {
  display: none;
}
.page-about .season-rail li {
  flex: 0 0 auto;
}
.page-about .season-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}
.page-about .season-rail__link:hover,
.page-about .season-rail__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(63, 224, 200, 0.12);
  color: var(--green);
}
.page-about .season-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--brick);
}
.page-about .season-rail__yr {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.page-about .about-rail__note {
  display: none;
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--sage);
}
.page-about .about-rail__note a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-block + .about-block {
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line);
}
.page-about .section-head__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--green-deep);
}
.page-about .about-block > p {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.88;
  color: rgba(28, 22, 19, 0.8);
}
.page-about .about-block > p a,
.page-about .range-notes__foot a,
.page-about .keep-cta a,
.page-about .user-row__text a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-block > p a:hover,
.page-about .range-notes__foot a:hover,
.page-about .keep-cta a:hover,
.page-about .user-row__text a:hover {
  background: rgba(63, 224, 200, 0.2);
}

/* ---------- 日常工作 ---------- */
.page-about .daily-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .daily-card {
  background: var(--paper);
  padding: clamp(18px, 2.4vw, 26px);
  min-width: 0;
}
.page-about .daily-card__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--brick);
}
.page-about .daily-card__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--green-deep);
}
.page-about .daily-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(28, 22, 19, 0.74);
}

/* ---------- 历程 ---------- */
.page-about .about-history__figure {
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--green-deep);
}
.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  filter: saturate(0.7);
}

.page-about .season-track {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  margin-top: clamp(32px, 4.6vw, 56px);
}
.page-about .season-row {
  position: relative;
  display: grid;
  gap: 14px;
  padding-left: 22px;
  border-left: 2px solid var(--season-track-line);
  min-width: 0;
}
.page-about .season-row::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--green);
}
.page-about .season-row--2425::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 200, 0.22);
}
.page-about .season-row__meta {
  min-width: 0;
}
.page-about .season-row__yr {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--green);
}
.page-about .season-row--2425 .season-row__yr {
  color: var(--cyan-deep);
}
.page-about .season-row__phase {
  display: inline-block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--brick);
}
.page-about .season-row__bar {
  display: block;
  width: min(180px, 100%);
  height: 5px;
  margin-top: 12px;
  background: var(--mist);
}
.page-about .season-row__bar::after {
  content: "";
  display: block;
  height: 100%;
  width: var(--w, 40%);
  background: var(--green);
  transition: width 0.4s var(--ease);
}
.page-about .season-row--1920 { --w: 14%; }
.page-about .season-row--2021 { --w: 26%; }
.page-about .season-row--2122 { --w: 42%; }
.page-about .season-row--2223 { --w: 58%; }
.page-about .season-row--2324 { --w: 78%; }
.page-about .season-row--2425 { --w: 100%; }
.page-about .season-row--2425 .season-row__bar::after {
  background: var(--cyan-deep);
}
.page-about .season-row__body {
  min-width: 0;
}
.page-about .season-row__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.86;
  color: rgba(28, 22, 19, 0.78);
}

/* ---------- 两套划分 ---------- */
.page-about .dual-track {
  margin-top: clamp(26px, 3.6vw, 42px);
  border: 1px solid var(--line);
  background: var(--paper-2);
  padding: clamp(16px, 2.2vw, 26px);
}
.page-about .dual-track__axis {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
  margin-left: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--sage);
  text-align: center;
}
.page-about .dual-track__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: 14px;
}
.page-about .dual-track__name {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
}
.page-about .dual-track__lane {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
}
.page-about .dual-track__seg {
  display: block;
  height: 26px;
}
.page-about .dual-track__lane--youth .dual-track__seg {
  background: var(--mist);
  border-top: 2px solid var(--cyan-deep);
}
.page-about .dual-track__lane--youth .dual-track__seg:nth-child(6) {
  background: var(--cyan);
}
.page-about .dual-track__lane--cup .dual-track__seg {
  background: #F6E2C6;
  border-top: 2px solid var(--amber);
  opacity: 0.55;
}
.page-about .dual-track__lane--cup .dual-track__seg:nth-child(5),
.page-about .dual-track__lane--cup .dual-track__seg:nth-child(6) {
  opacity: 1;
}

.page-about .range-notes {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .range-note {
  background: var(--paper);
  padding: clamp(18px, 2.4vw, 28px);
  min-width: 0;
}
.page-about .range-note--youth {
  border-top: 3px solid var(--cyan);
}
.page-about .range-note--cup {
  border-top: 3px solid var(--amber);
}
.page-about .range-note__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--green-deep);
}
.page-about .range-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.84;
  color: rgba(28, 22, 19, 0.76);
}
.page-about .range-notes__foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 团队 ---------- */
.page-about .crew-layout {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(24px, 3.2vw, 38px);
}
.page-about .crew-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--slate);
}
.page-about .crew-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.6) brightness(0.94);
}
.page-about .crew-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .crew-card {
  background: var(--paper);
  padding: clamp(16px, 2.2vw, 24px);
  min-width: 0;
  position: relative;
}
.page-about .crew-card__coord {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--brick);
  padding: 2px 6px;
  border: 1px solid rgba(210, 73, 42, 0.42);
}
.page-about .crew-card__title {
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--green-deep);
}
.page-about .crew-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(28, 22, 19, 0.74);
}

.page-about .cycle-steps {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .cycle-steps__item {
  background: var(--green);
  color: var(--paper);
  padding: 14px 16px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}
.page-about .cycle-steps__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-about .cycle-steps__label {
  font-size: 14px;
  line-height: 1.5;
}
.page-about .cycle-steps__item:last-child {
  background: var(--green-deep);
}

/* ---------- 使用者 ---------- */
.page-about .user-list {
  display: grid;
  gap: 0;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .user-row {
  border-top: 1px solid var(--line);
  padding: clamp(18px, 2.4vw, 28px) 0;
  display: grid;
  gap: 10px;
  min-width: 0;
}
.page-about .user-row:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .user-row__title {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--green-deep);
}
.page-about .user-row__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.86;
  color: rgba(28, 22, 19, 0.76);
}

/* ---------- 长期可用 ---------- */
.page-about .keep-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .keep-card {
  background: var(--paper);
  padding: clamp(18px, 2.4vw, 26px);
  min-width: 0;
  border-left: 3px solid transparent;
}
.page-about .keep-card:nth-child(1) {
  border-left-color: var(--cyan);
}
.page-about .keep-card:nth-child(2) {
  border-left-color: var(--amber);
}
.page-about .keep-card:nth-child(3) {
  border-left-color: var(--brick);
}
.page-about .keep-card__val {
  margin: 8px 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 23px);
  line-height: 1.2;
  color: var(--green);
}
.page-about .keep-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(28, 22, 19, 0.72);
}
.page-about .keep-cta {
  margin: clamp(24px, 3.2vw, 36px) 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(28, 22, 19, 0.8);
}

/* ==================== 响应式 ==================== */
@media (min-width: 620px) {
  .page-about .about-quick {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .daily-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .keep-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .crew-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .cycle-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .cycle-steps__item {
    flex-direction: column;
    gap: 8px;
  }
  .page-about .range-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .season-row {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    padding-left: 26px;
  }
  .page-about .user-row {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 48px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(40px, 5vw, 88px);
  }
  .page-about .daily-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 96px);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
  .page-about .season-rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .season-rail li {
    flex: none;
  }
  .page-about .season-rail__link {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--line);
    padding: 8px 0 8px 14px;
    gap: 10px;
    font-size: 13.5px;
  }
  .page-about .season-rail__link:hover,
  .page-about .season-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(63, 224, 200, 0.1);
  }
  .page-about .about-rail__note {
    display: block;
  }
  .page-about .crew-layout {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    align-items: start;
  }
  .page-about .crew-figure {
    position: sticky;
    top: calc(var(--header-h) + 40px);
  }
  .page-about .dual-track {
    padding: clamp(20px, 2.6vw, 32px);
  }
  .page-about .dual-track__row {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: center;
    gap: 16px;
  }
  .page-about .dual-track__axis {
    margin-left: 124px;
  }
}

@media (min-width: 1180px) {
  .page-about .season-row {
    grid-template-columns: 178px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__figure::after {
    background: none;
  }
  .page-about .season-row__bar::after {
    transition: none;
  }
}