.page-about {
  --about-tl-pad: clamp(28px, 5vw, 48px);
  display: block;
  background: var(--night);
  color: var(--mint);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(88px, 13vw, 148px) clamp(48px, 7vw, 76px);
  background:
    radial-gradient(120% 78% at 84% -12%, rgba(201, 242, 77, 0.15), transparent 62%),
    var(--night);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(216, 213, 200, 0.055) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(216, 213, 200, 0.055) 0 1px, transparent 1px 34px);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 78%);
  mask-image: linear-gradient(180deg, #000, transparent 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--whistle) 18%, var(--whistle) 72%, transparent);
  opacity: 0.55;
}

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

.page-about .breadcrumbs {
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-hero h1 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(38px, 9.2vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  color: var(--paper);
  max-width: 15em;
}

.page-about .about-hero h1 .hl {
  color: var(--whistle);
  position: relative;
}

.page-about .about-hero h1 .hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.06em;
  height: 3px;
  background: rgba(201, 242, 77, 0.34);
}

.page-about .about-hero .lead {
  max-width: 33em;
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.8;
  color: var(--mint);
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .hero-note {
  max-width: 34em;
  font-size: clamp(15px, 1.8vw, 16.5px);
  line-height: 1.8;
  color: var(--mute);
  margin: 0;
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: rgba(216, 213, 200, 0.22);
  border: 1px solid rgba(216, 213, 200, 0.22);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero-stats li {
  background: var(--field);
  padding: clamp(14px, 2.4vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .hero-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--whistle);
}

.page-about .hero-stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

/* ---------- 章节容器 ---------- */
.page-about .about-chapters {
  background: var(--night);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 36px);
}

/* ---------- 章节目录浮岛 ---------- */
.page-about .about-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc a {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid rgba(216, 213, 200, 0.24);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--paper);
  border-color: rgba(201, 242, 77, 0.6);
}

.page-about .about-toc a.is-active,
.page-about .about-toc a[aria-current="true"] {
  color: var(--night);
  background: var(--whistle);
  border-color: var(--whistle);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  --about-tl-pad: clamp(28px, 5vw, 48px);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 5.5vw, 62px);
  padding-left: var(--about-tl-pad);
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(
    to bottom,
    var(--whistle) 0%,
    rgba(201, 242, 77, 0.35) 22%,
    rgba(216, 213, 200, 0.18) 62%,
    rgba(216, 213, 200, 0.08) 100%
  );
}

.page-about .tl-item {
  position: relative;
  scroll-margin-top: 110px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl-pad) + 1px);
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--night);
  border: 2px solid rgba(201, 242, 77, 0.55);
  transition: background 0.5s var(--ease), border-color 0.5s var(--ease), box-shadow 0.5s var(--ease);
}

.page-about .tl-item.is-in::before {
  background: var(--whistle);
  border-color: var(--whistle);
  box-shadow: 0 0 0 6px rgba(201, 242, 77, 0.16);
}

.page-about .tl-card {
  position: relative;
  background: var(--paper);
  color: var(--field);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 4vw, 42px);
  box-shadow: var(--shadow-sheet);
}

.page-about .tl-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(12px, 2vw, 18px);
}

.page-about .tl-step {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--night);
  background: var(--whistle);
  border-radius: var(--radius-pill);
  padding: 4px 11px;
}

.page-about .tl-phase {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--field);
  border: 1px solid rgba(18, 58, 50, 0.28);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  margin: 0;
}

.page-about .tl-card h2 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(14px, 2.4vw, 20px);
  color: var(--night);
}

.page-about .tl-card p {
  max-width: 38em;
  font-size: clamp(16px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--field);
  margin: 0 0 1em;
}

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

.page-about .tl-card a {
  color: var(--night);
  text-decoration: none;
  border-bottom: 2px solid var(--whistle);
  padding-bottom: 1px;
}

.page-about .tl-card a:hover,
.page-about .tl-card a:focus-visible {
  border-bottom-color: var(--night);
}

/* 卡片内图组 */
.page-about .media-frame {
  margin: clamp(18px, 3vw, 28px) 0 0;
}

.page-about .tl-card .media {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--paper-line);
}

.page-about .media-caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(18, 58, 50, 0.72);
  max-width: 40em;
}

/* 赛季专题四格 */
.page-about .series-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(16px, 3vw, 24px) 0 0;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .series-cell {
  background: var(--field);
  color: var(--mint);
  padding: clamp(16px, 3vw, 22px);
}

.page-about .series-name {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--whistle);
  margin: 0 0 4px;
  max-width: none;
}

.page-about .series-when {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin: 0 0 10px;
  max-width: none;
}

.page-about .series-what {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mint);
  margin: 0;
  max-width: none;
}

.page-about .series-tail {
  margin: clamp(16px, 3vw, 22px) 0 0;
}

/* 档案数据 */
.page-about .archive-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .archive-stats .stat {
  background: var(--paper);
  padding: clamp(16px, 2.6vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .archive-stats .stat-figure {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5.2vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--night);
}

.page-about .archive-stats .stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(18, 58, 50, 0.78);
}

/* ---------- 接下来 ---------- */
.page-about .about-next {
  position: relative;
  overflow: hidden;
  background: var(--indigo);
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--whistle) 0%, var(--whistle) 42%, var(--amber) 100%);
}

.page-about .about-next h2 {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--paper);
  margin: 0 0 clamp(12px, 2vw, 18px);
  max-width: 16em;
}

.page-about .next-lead {
  max-width: 34em;
  font-size: clamp(16px, 1.9vw, 17px);
  line-height: 1.8;
  color: rgba(234, 243, 238, 0.76);
  margin: 0;
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 2vw, 18px);
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(20px, 3vw, 30px);
  background: rgba(234, 243, 238, 0.06);
  border: 1px solid rgba(234, 243, 238, 0.22);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--mint);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--whistle);
  background: rgba(201, 242, 77, 0.1);
}

.page-about .next-kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .next-title {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 26px);
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .next-desc {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(234, 243, 238, 0.78);
}

.page-about .next-arrow {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--whistle);
  transition: transform 0.3s var(--ease);
}

.page-about .next-card:hover .next-arrow,
.page-about .next-card:focus-visible .next-arrow {
  transform: translateX(6px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .series-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: clamp(96px, 14vh, 136px);
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc a {
    border: 0;
    border-left: 2px solid rgba(216, 213, 200, 0.2);
    border-radius: 0;
    padding: 9px 0 9px 15px;
    white-space: normal;
    line-height: 1.55;
    font-size: 12.5px;
    background: transparent;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible {
    border-left-color: rgba(201, 242, 77, 0.7);
    color: var(--paper);
  }

  .page-about .about-toc a.is-active,
  .page-about .about-toc a[aria-current="true"] {
    background: transparent;
    border-left-color: var(--whistle);
    color: var(--whistle);
  }

  .page-about .tl-item:nth-child(odd) .tl-card {
    transform: rotate(-0.32deg);
  }

  .page-about .tl-item:nth-child(even) .tl-card {
    transform: rotate(0.26deg);
  }

  .page-about .tl-item {
    scroll-margin-top: 130px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::before,
  .page-about .next-card,
  .page-about .next-arrow,
  .page-about .about-toc a {
    transition: none;
  }

  .page-about .tl-item:nth-child(odd) .tl-card,
  .page-about .tl-item:nth-child(even) .tl-card {
    transform: none;
  }
}