.page-about {
  --about-line: rgba(15, 76, 99, 0.16);
  background: var(--paper);
  color: var(--ink);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(26px, 4vw, 46px);
}
.page-about__title {
  margin: 10px 0 0;
  max-width: 16em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.015em;
}
.page-about__lede {
  margin: 18px 0 0;
  max-width: 640px;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: var(--lead);
}
.page-about__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}
.page-about__stat {
  border-top: 2px solid var(--lake);
  padding-top: 10px;
}
.page-about__stat:nth-child(2) { border-top-color: var(--grass); }
.page-about__stat:nth-child(3) { border-top-color: var(--yellow); }
.page-about__stat:nth-child(4) { border-top-color: var(--orange); }
.page-about__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about__stat-label {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--lead);
}

/* ---------- 双栏骨架与左栏时间轴 ---------- */
.page-about__layout {
  padding-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}
.page-about__timeline {
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}
.page-about__tl-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--lead);
}
.page-about__tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about__tl-list::-webkit-scrollbar { display: none; }
.page-about__tl-item { flex: 0 0 auto; }
.page-about__tl-link {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 10px;
  border-top: 2px solid var(--mist);
  color: var(--lead);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about__tl-link:hover,
.page-about__tl-link:focus-visible {
  color: var(--ink);
  border-top-color: var(--orange);
}
.page-about__tl-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
}
.page-about__tl-name { display: none; }

/* ---------- 正文列 ---------- */
.page-about__body { min-width: 0; }

.page-about__chapter {
  padding: clamp(28px, 4.2vw, 52px) 0;
  border-top: var(--hairline);
}
.page-about__body > .page-about__chapter:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .chapter__band {
  height: 5px;
  margin-bottom: 18px;
  background: linear-gradient(90deg, var(--lake) 0%, var(--grass) 62%, var(--yellow) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}
.page-about .chapter__band.is-visible { transform: scaleX(1); }

.page-about .chapter__num {
  display: inline-block;
  padding: 0 8px 3px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--lake);
  background: linear-gradient(transparent 60%, rgba(46, 107, 79, 0.2) 60%);
}
.page-about .chapter__title {
  margin: 10px 0 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}
.page-about .chapter__lede {
  margin: 14px 0 0;
  max-width: 660px;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--lead);
}

.page-about .prose {
  max-width: 660px;
  font-size: 16.5px;
  line-height: 1.9;
}
.page-about .prose p { margin: 0 0 1.15em; }
.page-about .prose > :last-child { margin-bottom: 0; }

/* ---------- 图片容器 ---------- */
.page-about .media { margin: 0; }
.page-about .media__frame {
  width: 100%;
  overflow: hidden;
  background: var(--mist);
  border: var(--hairline);
}
.page-about .media__frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .media--wide .media__frame { aspect-ratio: 16 / 9; }
.page-about .media--tall .media__frame { aspect-ratio: 4 / 5; }
.page-about__ratio-4x3 { aspect-ratio: 4 / 3; }
.page-about .media__caption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--lead);
}

/* ---------- 01 起点 ---------- */
.page-about__start {
  display: grid;
  gap: 22px;
  margin-top: 24px;
}
.page-about__start-media { align-self: start; }

/* ---------- 02 版图 ---------- */
.page-about__regions {
  margin-top: 24px;
  padding-top: 20px;
  border-top: var(--hairline);
  max-width: 660px;
}
.page-about__regions-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lead);
}
.page-about .tag-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}
.page-about__tags { margin-bottom: 20px; }
.page-about__tags:last-child { margin-bottom: 0; }
.page-about .tag {
  display: inline-block;
  padding: 6px 12px;
  border: var(--hairline);
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.4;
}

/* ---------- 03 比分 ---------- */
.page-about__flow {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  max-width: 660px;
}
.page-about__flow li {
  position: relative;
  padding: 14px 0 14px 46px;
  border-top: var(--hairline);
  font-size: 16px;
  line-height: 1.8;
}
.page-about__flow li:last-child { border-bottom: var(--hairline); }
.page-about__flow-num {
  position: absolute;
  left: 0;
  top: 15px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--orange);
}
.page-about__desk-media {
  max-width: 660px;
  margin-bottom: 26px;
}

/* ---------- 呼吸段 ---------- */
.page-about__breather {
  position: relative;
  overflow: hidden;
  margin: clamp(28px, 4vw, 46px) 0;
  padding: clamp(26px, 4vw, 46px) clamp(22px, 4vw, 44px);
  background-color: var(--lake);
  background-image: linear-gradient(135deg, #0F4C63 0%, #0B2A34 100%);
  color: var(--white);
}
.page-about__breather::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.07) 0 1px, transparent 1px 24px);
  pointer-events: none;
}
.page-about__breather p {
  position: relative;
  margin: 0;
  max-width: 24em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 3vw, 29px);
  line-height: 1.45;
  letter-spacing: -0.01em;
}
.page-about__breather span {
  position: relative;
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- 04 赛季轴 ---------- */
.page-about__evolution {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}
.page-about__seasons {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  max-width: 660px;
}
.page-about__seasons::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--lake), var(--grass));
  opacity: 0.4;
}
.page-about__season {
  position: relative;
  padding-bottom: 26px;
}
.page-about__season:last-child { padding-bottom: 0; }
.page-about__season::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--lake);
}
.page-about__season:last-child::before {
  background: var(--orange);
  border-color: var(--orange);
}
.page-about__season-tag {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--lake);
  background: rgba(242, 193, 78, 0.4);
}
.page-about__season p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
}
.page-about__archive-media { align-self: start; }

/* ---------- 05 班组 ---------- */
.page-about .grid--3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 26px;
}
.page-about .card {
  background: var(--white);
  border: var(--hairline);
  border-radius: 2px;
  padding: 20px 18px;
  box-shadow: var(--soft-shadow);
}
.page-about .card__meta {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--grass);
}
.page-about .card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
}
.page-about .card__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--lead);
}

/* ---------- 06 伙伴 ---------- */
.page-about__partners {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 18px;
  margin: 24px 0 0;
  padding: 22px 0 0;
  border-top: var(--hairline);
  max-width: 660px;
}
.page-about .score__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lake);
}
.page-about .score__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--lead);
}
.page-about__partners + .prose { margin-top: 26px; }

/* ---------- 接着往下看 ---------- */
.page-about__next {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 2px solid var(--ink);
}
.page-about__next-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.6vw, 26px);
}
.page-about__next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about__next-link {
  display: block;
  padding: 16px 18px;
  background: var(--white);
  border: var(--hairline);
  border-left: 3px solid var(--orange);
  color: var(--ink);
  text-decoration: none;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}
.page-about__next-link:hover,
.page-about__next-link:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--soft-shadow);
}
.page-about__next-link strong {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
}
.page-about__next-link span {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--lead);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
  .page-about__next-list { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
}

@media (min-width: 820px) {
  .page-about__start {
    grid-template-columns: minmax(0, 1fr) 380px;
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about__evolution {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about__layout {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about__timeline {
    position: sticky;
    top: 112px;
  }
  .page-about__tl-list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
  }
  .page-about__tl-link {
    border-top: none;
    border-left: 2px solid var(--mist);
    padding: 7px 0 7px 12px;
  }
  .page-about__tl-link:hover,
  .page-about__tl-link:focus-visible {
    border-top-color: var(--mist);
    border-left-color: var(--orange);
  }
  .page-about__tl-name { display: inline; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter__band {
    transform: scaleX(1);
    transition: none;
  }
  .page-about__next-link { transition: none; }
  .page-about__next-link:hover,
  .page-about__next-link:focus-visible { transform: none; }
}