.page-about {
  --about-rail: 210px;
  position: relative;
  overflow-x: hidden;
  background: var(--charcoal);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .breadcrumbs {
  padding: 18px 0 2px;
  font-size: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 28px;
  padding: clamp(18px, 4vw, 36px) 0 clamp(32px, 6vw, 56px);
  border-bottom: 1px solid var(--grid);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(-1 * var(--gutter));
  right: calc(-1 * var(--gutter));
  background-image:
    linear-gradient(var(--grain) 1px, transparent 1px),
    linear-gradient(90deg, var(--grain) 1px, transparent 1px);
  background-size: 104px 104px;
  opacity: 0.16;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 14px;
  border: 1px solid var(--turf);
  border-radius: var(--capsule);
  color: var(--elec);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 0 0 26px;
  max-width: 64ch;
  color: var(--steel);
  font-size: clamp(15px, 1.07vw + 12px, 17px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__panel {
  padding: 22px 22px 24px;
  background: var(--night);
  border-top: 2px solid var(--amber);
}

.page-about .about-hero__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-stats li {
  padding-top: 10px;
  border-top: 1px solid var(--grid);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 时间轴骨架 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 26px;
  padding-top: clamp(28px, 5vw, 48px);
}

.page-about .about-timeline__rail-title {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--concrete);
}

.page-about .about-timeline__anchors {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-timeline__anchors a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--grid);
  border-radius: var(--capsule);
  color: var(--steel);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.page-about .about-timeline__anchors a .num {
  font-family: var(--font-num);
  color: var(--paper);
}

.page-about .about-timeline__anchors a:hover,
.page-about .about-timeline__anchors a:focus-visible {
  color: var(--elec);
  border-color: var(--elec);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-timeline__anchors a:focus-visible {
  outline: 2px solid var(--elec);
  outline-offset: 2px;
}

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

/* ---------- 时间轴条目 ---------- */
.page-about .tl-block {
  position: relative;
  scroll-margin-top: 108px;
  padding: 0 0 clamp(28px, 5vw, 44px) clamp(16px, 4vw, 32px);
  border-left: 1px solid var(--grid);
}

.page-about .tl-block::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 10px;
  width: 7px;
  height: 7px;
  background: var(--turf-lit);
  box-shadow: 0 0 0 3px rgba(31, 111, 67, 0.25);
}

.page-about .tl-block__year {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .tl-block__year .num {
  font-size: 18px;
  font-weight: 700;
  margin-right: 6px;
}

.page-about .tl-block__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw + 12px, 32px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl-block__body > p {
  margin: 0 0 16px;
  max-width: 74ch;
  color: var(--steel);
  font-size: clamp(15px, 0.8vw + 12px, 17px);
}

.page-about .tl-block__body a {
  color: var(--elec);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 6px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  background: var(--charcoal-2);
}

.page-about .about-figure--portrait img {
  max-width: 400px;
  aspect-ratio: 4 / 5;
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--concrete);
}

/* ---------- 斜切引用面板 ---------- */
.page-about .about-quote {
  margin: 24px 0 0;
  padding: 22px 26px;
  background: var(--night);
  border-left: 3px solid var(--elec);
  clip-path: polygon(0 0, 100% 2.5%, 100% 100%, 0 97.5%);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 66ch;
  color: var(--paper);
  font-size: 16px;
}

/* ---------- 可展开条目 ---------- */
.page-about .about-details {
  margin: 22px 0 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-details details {
  border-bottom: 1px solid var(--grid);
}

.page-about .about-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 2px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-details summary::-webkit-details-marker {
  display: none;
}

.page-about .about-details summary::after {
  content: "＋";
  font-family: var(--font-num);
  color: var(--elec);
}

.page-about .about-details details[open] summary::after {
  content: "－";
}

.page-about .about-details summary:focus-visible {
  outline: 2px solid var(--elec);
  outline-offset: 2px;
}

.page-about .about-details__body {
  padding: 0 2px 18px;
}

.page-about .about-details__body p {
  margin: 0;
  max-width: 74ch;
  color: var(--steel);
  font-size: 15px;
}

/* ---------- 呼吸区 ---------- */
.page-about .about-breath {
  margin: 4px 0 clamp(28px, 5vw, 44px);
  padding: 20px 22px;
  background: var(--paper);
  border-left: 4px solid var(--amber);
}

.page-about .about-breath p {
  margin: 0;
  max-width: 60ch;
  color: var(--charcoal);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 1.6vw + 10px, 20px);
  line-height: 1.55;
}

/* ---------- 对照列表 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 22px 0 0;
}

.page-about .filter-status {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--concrete);
}

.page-about .about-compare {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-compare__item {
  padding: 16px 18px;
  background: var(--charcoal-2);
  border-left: 2px solid var(--concrete);
}

.page-about .about-compare__item[data-tags="赛季档案库"] {
  border-left-color: var(--elec);
}

.page-about .about-compare__item h4 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-compare__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 要点列表 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-facts li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  font-size: 15px;
  color: var(--steel);
}

.page-about .about-facts li::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-top: 10px;
  background: var(--turf-lit);
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .about-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-stats {
    gap: 18px 22px;
  }
}

/* ---------- 桌面：左右分栏与固定锚点 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    margin-top: 10px;
  }

  .page-about .about-timeline {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }

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

  .page-about .about-timeline__anchors a {
    justify-content: flex-start;
    padding: 7px 0 7px 12px;
    border: 0;
    border-left: 1px solid var(--grid);
    border-radius: var(--sharp);
    transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
  }

  .page-about .about-timeline__anchors a:hover,
  .page-about .about-timeline__anchors a:focus-visible {
    border-color: transparent;
    border-left-color: var(--elec);
    transform: translateX(2px);
  }

  .page-about .about-quote {
    padding: 26px 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__anchors a,
  .page-about .tl-block,
  .page-about .about-breath {
    transition: none;
  }

  .page-about .about-timeline__anchors a:hover,
  .page-about .about-timeline__anchors a:focus-visible {
    transform: none;
  }
}