.page-about {
  --about-max: 1180px;
  --about-rail-w: 176px;
  --about-flow-max: 40em;
  display: block;
  padding-bottom: 96px;
}

.page-about .about-wrap {
  width: min(var(--about-max), 100% - 32px);
  margin-inline: auto;
}

/* ---------- 面包屑与首屏 ---------- */

.page-about .breadcrumbs {
  margin-bottom: 30px;
}

.page-about .about-masthead {
  padding: 8px 0 56px;
  border-bottom: 1px solid var(--hairline);
}

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

.page-about .about-masthead__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 7.2vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--chalk);
  margin: 0 0 26px;
  max-width: 17ch;
}

.page-about .about-masthead .lede {
  max-width: 44ch;
  color: var(--mist);
  font-size: var(--fs-16);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-masthead__facts {
  list-style: none;
  margin: 46px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  border-top: 1px solid var(--hairline);
}

.page-about .about-fact {
  padding: 20px 0 2px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.6vw, 26px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--lime-signal);
}

.page-about .about-fact__label {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--mist);
}

@media (min-width: 700px) {
  .page-about .about-fact + .about-fact {
    padding-left: 26px;
    border-left: 1px solid var(--hairline);
  }
}

/* ---------- 双栏骨架 ---------- */

.page-about .about-grid {
  display: grid;
  gap: 8px;
}

@media (min-width: 940px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 72px;
    align-items: start;
  }
}

/* ---------- 年份轨道 ---------- */

.page-about .about-rail {
  padding-block: 30px 8px;
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--mist);
  margin: 0 0 14px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  font-size: var(--fs-14);
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail__link .num {
  font-size: var(--fs-12);
  color: var(--tactical-gray);
  transition: color 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--lime-signal);
}

.page-about .about-rail__link:hover .num,
.page-about .about-rail__link:focus-visible .num {
  color: var(--lime-signal);
}

@media (min-width: 940px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-block: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding: 9px 10px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-bottom-color: transparent;
    border-left-color: var(--lime-signal);
  }
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding-block: 68px 76px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter:first-child {
  padding-top: 32px;
}

.page-about .about-chapter__rule {
  position: relative;
  height: 10px;
  margin-bottom: 40px;
  border-top: 1px solid var(--pitch-line);
}

.page-about .about-chapter__rule::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--ink-base);
  border: 1px solid var(--pitch-line);
}

.page-about .about-chapter__coord {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--mist);
  margin: 0 0 14px;
}

.page-about .about-chapter__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--chalk);
  margin: 0 0 34px;
  max-width: 19ch;
}

.page-about .about-chapter__lead {
  display: grid;
  gap: 18px;
  margin-bottom: 34px;
}

@media (min-width: 700px) {
  .page-about .about-chapter__lead {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 6.4vw, 64px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--chalk);
  font-weight: 500;
}

.page-about .about-chapter__quote {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.8;
  color: var(--chalk);
  margin: 0;
  max-width: 36ch;
}

.page-about .about-chapter__body {
  max-width: var(--about-flow-max);
}

.page-about .about-chapter__body p {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
  margin: 0 0 18px;
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__body a {
  color: var(--lime-signal);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-strong);
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  border-bottom-color: var(--lime-signal);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 44px 0 0;
  border: 1px solid var(--hairline);
}

.page-about .about-figure--narrow {
  max-width: 520px;
}

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

/* ---------- 工序列表 ---------- */

.page-about .about-steps {
  list-style: none;
  margin: 40px 0 34px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border-block: 1px solid var(--hairline);
}

.page-about .about-steps > li {
  background: var(--ink-base);
  padding: 20px 4px;
  display: grid;
  gap: 8px;
}

@media (min-width: 700px) {
  .page-about .about-steps > li {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding: 22px 8px;
  }
}

.page-about .about-steps__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.12em;
  color: var(--lime-signal);
}

.page-about .about-steps__title {
  display: block;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--chalk);
  margin-bottom: 8px;
}

.page-about .about-steps p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--mist);
  max-width: 46ch;
}

/* ---------- 赛季刻度数据 ---------- */

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

@media (min-width: 740px) {
  .page-about .about-ledger {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-ledger__cell {
  background: var(--ink-base);
  padding: 26px 18px 28px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-ledger__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.2vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime-signal);
}

.page-about .about-ledger__unit {
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 赛季里程碑 ---------- */

.page-about .about-milestones {
  list-style: none;
  margin: 46px 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--pitch-line);
}

.page-about .about-milestones > li {
  position: relative;
  padding-bottom: 30px;
}

.page-about .about-milestones > li:last-child {
  padding-bottom: 0;
}

.page-about .about-milestones > li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--ink-base);
  border: 1px solid var(--lime-signal);
}

.page-about .about-milestones__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--mist);
  margin-bottom: 7px;
}

.page-about .about-milestones p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
  max-width: 46ch;
}

/* ---------- 合作三种方式 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border-block: 1px solid var(--hairline);
}

@media (min-width: 880px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partner {
  background: var(--ink-base);
  padding: 30px 22px 34px;
}

.page-about .about-partner__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--tactical-gray);
  margin: 0 0 16px;
}

.page-about .about-partner h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.4;
  color: var(--chalk);
  margin: 0 0 14px;
}

.page-about .about-partner p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 联系条 ---------- */

.page-about .about-contact {
  margin-top: 44px;
  padding: 30px 22px 32px;
  background: var(--ink-panel);
  border: 1px solid var(--hairline);
  display: grid;
  gap: 24px;
  justify-items: start;
}

@media (min-width: 880px) {
  .page-about .about-contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
    padding: 34px 32px;
  }
}

.page-about .about-contact__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.45;
  color: var(--chalk);
  margin: 0 0 16px;
}

.page-about .about-contact__list {
  margin: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 18px;
}

.page-about .about-contact__list dt {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--tactical-gray);
}

.page-about .about-contact__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--chalk);
  word-break: break-all;
}

.page-about .about-contact__hint {
  margin: 16px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
  max-width: 42ch;
}

/* ---------- 团队标签页 ---------- */

.page-about .about-team {
  margin-top: 4px;
}

.page-about .about-team .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-team .tabs__tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  padding: 12px 14px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-team .tabs__tab:hover,
.page-about .about-team .tabs__tab:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--hairline-strong);
}

.page-about .about-team .tabs__tab[aria-selected="true"] {
  color: var(--chalk);
  border-bottom-color: var(--lime-signal);
}

.page-about .about-team .tabs__panel {
  padding: 28px 0 0;
  max-width: var(--about-flow-max);
}

.page-about .about-team .tabs__panel p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 结尾入口 ---------- */

.page-about .about-cta {
  margin-top: 68px;
  padding-top: 40px;
  border-top: 1px solid var(--hairline);
  display: grid;
  gap: 18px;
  justify-items: start;
}

@media (min-width: 760px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: center;
    gap: 16px 18px;
  }
}

.page-about .about-cta p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-20);
  line-height: 1.62;
  color: var(--chalk);
  max-width: 30ch;
}

/* ---------- 窄屏收尾 ---------- */

@media (max-width: 480px) {
  .page-about .about-chapter__lead {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-chapter__num {
    font-size: 40px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-team .tabs__tab {
    transition: none;
  }
}