.page-about {
  --about-rail-w: 236px;
  background-color: var(--ink-800);
  color: var(--silver);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 52px;
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(31, 217, 126, 0.16), transparent 58%),
    radial-gradient(90% 80% at 96% 12%, rgba(255, 122, 47, 0.08), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(195, 207, 218, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(195, 207, 218, 0.055) 1px, transparent 1px);
  background-size: 68px 68px;
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 26px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .about-hero .breadcrumbs a {
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero .breadcrumbs a:hover,
.page-about .about-hero .breadcrumbs a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(28px, 6vw, 54px);
  font-weight: 200;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background-color: rgba(6, 16, 25, 0.82);
}

.page-about .about-stats__value {
  font-size: 22px;
  line-height: 1.1;
  color: var(--green);
}

.page-about .about-stats__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--gray);
}

/* ---------- 分栏骨架 ---------- */
.page-about .about-body {
  padding-top: 48px;
  padding-bottom: 76px;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

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

/* ---------- 左轨时间线 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
}

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

.page-about .about-timeline__link {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: baseline;
  gap: 6px;
  padding: 8px 4px 8px 0;
  font-size: 13px;
  line-height: 1.45;
  color: var(--gray);
  text-decoration: none;
  border-radius: var(--radius);
  transition: color 0.2s var(--ease);
}

.page-about .about-timeline__num {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--green-deep);
}

.page-about .about-timeline__link:hover,
.page-about .about-timeline__link:focus-visible {
  color: var(--paper);
}

.page-about .about-timeline__link:focus-visible {
  outline: 1px solid var(--green);
  outline-offset: 2px;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding-top: 32px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  margin-bottom: 20px;
}

.page-about .about-chapter__head .section-title {
  margin: 12px 0 0;
  max-width: 28ch;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter__body > p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--silver);
}

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

.page-about .about-inline-link {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 217, 126, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--green-soft);
  border-bottom-color: var(--green-soft);
}

/* ---------- 需求清单 ---------- */
.page-about .about-needs {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-needs li {
  position: relative;
  padding: 13px 16px 13px 36px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  background-color: var(--ink-700);
  border: 1px solid var(--line);
  border-left: 2px solid var(--green-deep);
  border-radius: var(--radius);
}

.page-about .about-needs li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 20px;
  width: 8px;
  height: 8px;
  background-color: var(--green);
  border-radius: 1px;
  transform: rotate(45deg);
}

/* ---------- 版本列表 ---------- */
.page-about .about-versions {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-versions__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 24px;
}

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

.page-about .about-versions__ver {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--green);
}

.page-about .about-versions__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-versions__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 数据要点 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-facts__item {
  display: grid;
  gap: 5px;
  padding: 15px 16px;
  background-color: var(--ink-900);
}

.page-about .about-facts__value {
  font-size: 17px;
  line-height: 1.2;
  color: var(--green);
}

.page-about .about-facts__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--gray);
}

/* ---------- 折叠面板 ---------- */
.page-about .about-collapse {
  margin-top: 26px;
}

.page-about .about-checks {
  margin: 0;
  padding: 4px 0 0;
}

.page-about .about-checks dt {
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--green);
}

.page-about .about-checks dt:first-child {
  margin-top: 0;
}

.page-about .about-checks dd {
  margin: 6px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 团队标签页 ---------- */
.page-about .about-tabs {
  margin-top: 24px;
}

.page-about .about-tabs__panel {
  margin-top: 18px;
  padding: 18px 20px;
  background-color: var(--ink-700);
  border: 1px solid var(--line);
  border-left: 2px solid var(--green-deep);
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-tabs__panel p {
  margin: 0;
  max-width: 62ch;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-scope {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-scope__item {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background-color: var(--ink-900);
}

.page-about .about-scope__num {
  font-size: 19px;
  color: var(--green);
}

.page-about .about-scope__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 备案信息 ---------- */
.page-about .about-legal {
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-legal__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-legal__row dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .about-legal__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-rhythm__item {
  position: relative;
  padding: 18px 18px 18px 20px;
  background-color: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-rhythm__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--green) 0%, var(--green-deep) 100%);
}

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

.page-about .about-rhythm__title {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--silver);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  margin-top: 52px;
  padding: 28px 22px;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--green);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, rgba(31, 217, 126, 0.12) 0%, rgba(6, 16, 25, 0.5) 58%, rgba(6, 16, 25, 0.2) 100%);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-outro__title {
  margin: 0 0 12px;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 300;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-outro p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-outro__links {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background-color: var(--ink-900);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--gray);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-versions__item {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 22px;
    padding-left: 26px;
  }

  .page-about .about-versions__item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 5px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--green);
    box-shadow: 0 0 0 4px rgba(31, 217, 126, 0.14);
  }

  .page-about .about-versions__item::after {
    content: "";
    position: absolute;
    left: 4.5px;
    top: 21px;
    bottom: 6px;
    width: 1px;
    background-color: var(--line-strong);
  }

  .page-about .about-versions__item:last-child::after {
    display: none;
  }

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

  .page-about .about-scope__item {
    grid-template-columns: 74px minmax(0, 1fr);
  }

  .page-about .about-legal__row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

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

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

/* ---------- 桌面分屏 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 64px);
    padding-bottom: 68px;
  }

  .page-about .about-body {
    padding-top: 64px;
    padding-bottom: 96px;
  }

  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 68px;
  }

  .page-about .about-rail {
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    padding-right: 20px;
    border-right: 1px solid var(--line);
  }

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

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, rgba(31, 217, 126, 0.9) 0%, rgba(31, 217, 126, 0.18) 72%, transparent 100%);
  }

  .page-about .about-timeline__link {
    grid-template-columns: 34px minmax(0, 1fr);
    padding: 9px 8px 9px 22px;
  }

  .page-about .about-timeline__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 14px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background-color: var(--ink-800);
    border: 1px solid var(--line-strong);
    transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  }

  .page-about .about-timeline__link:hover::before,
  .page-about .about-timeline__link:focus-visible::before {
    background-color: var(--green);
    border-color: var(--green);
    box-shadow: 0 0 0 4px rgba(31, 217, 126, 0.18);
  }

  .page-about .about-chapter {
    margin-top: 52px;
    padding-top: 40px;
  }

  .page-about .about-figure {
    margin-top: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__link,
  .page-about .about-timeline__link::before,
  .page-about .about-inline-link,
  .page-about .about-hero .breadcrumbs a {
    transition: none;
  }
}