.page-about {
  --moss-line: rgba(124, 139, 128, 0.42);
  --ax-rail: 84px;
  --ax-float: 268px;
}

/* 页头 */
.page-about .about-head {
  max-width: 860px;
  padding-bottom: 8px;
}

.page-about .head-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 16px;
}

.page-about .head-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .head-fact__num {
  font-family: var(--font-num);
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--ink-700);
  white-space: nowrap;
}

.page-about .head-fact__label {
  font-size: var(--step--1);
  color: var(--moss);
  max-width: 46ch;
}

/* 顶部纸张索引图 */
.page-about .about-bleed {
  max-width: 1240px;
  margin: 24px auto 0;
  padding: 0 20px;
}

.page-about .about-bleed img {
  display: block;
  width: 100%;
  height: clamp(160px, 23vw, 320px);
  object-fit: cover;
  border-radius: 3px 52px 3px 52px;
  filter: saturate(0.85) contrast(1.03);
}

.page-about .about-bleed figcaption {
  margin-top: 12px;
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--moss);
}

/* 筛选条 */
.page-about .filter-bar {
  display: grid;
  gap: 18px;
  margin: 44px 0 0;
  padding: 26px 24px 24px;
  background: var(--ink-700);
  border-radius: 4px 46px 4px 4px;
}

.page-about .filter-bar__title {
  margin: 0;
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--paper-100);
}

.page-about .filter-bar__hint {
  margin: 8px 0 0;
  font-size: var(--step--1);
  line-height: 1.65;
  color: rgba(246, 241, 231, 0.7);
  max-width: 56ch;
}

.page-about .filter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding-top: 14px;
  border-top: 1px solid var(--ink-line);
}

.page-about .filter-row__label {
  font-size: var(--step--1);
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--mist);
  min-width: 46px;
}

.page-about .filter-row__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .filter-tag {
  appearance: none;
  border: 1px solid rgba(246, 241, 231, 0.34);
  background: transparent;
  color: var(--paper-100);
  font: inherit;
  font-size: var(--step--1);
  font-weight: 700;
  padding: 7px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .filter-tag:hover,
.page-about .filter-tag:focus-visible {
  border-color: var(--paper-100);
  transform: translateY(-1px);
}

.page-about .filter-tag[aria-pressed="true"] {
  background: var(--paper-100);
  border-color: var(--paper-100);
  color: var(--ink-700);
}

.page-about .filter-bar__scope {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--ink-line);
  font-size: var(--step--2);
  letter-spacing: 0.02em;
  color: rgba(246, 241, 231, 0.62);
}

/* 主轴布局 */
.page-about .history-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 52px;
}

/* 年份刻度轴 */
.page-about .year-rail__cap {
  margin: 0 0 12px;
  font-size: var(--step--2);
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-about .year-axis__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .year-axis__item {
  position: relative;
  flex: 0 0 auto;
}

.page-about .year-axis__link {
  display: inline-block;
  padding: 6px 13px;
  font-family: var(--font-num);
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--ink-700);
  background: var(--paper-200);
  border: 1px solid transparent;
  border-radius: 999px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .year-axis__link:hover,
.page-about .year-axis__link:focus-visible {
  border-color: var(--orange);
  color: var(--orange-deep);
}

.page-about .year-axis__item[data-current] .year-axis__link {
  background: var(--orange);
  color: var(--ink-900);
}

/* 记录区 */
.page-about .records {
  min-width: 0;
}

.page-about .year-block {
  scroll-margin-top: 96px;
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px dashed var(--moss-line);
}

.page-about .year-block:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.page-about .year-block__year {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: var(--step-2);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--ink-700);
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .year-block__year::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--line-soft);
}

.page-about .year-block__sum {
  margin: 0 0 18px;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--moss);
  max-width: 54ch;
}

.page-about .rec-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .rec {
  padding: 16px 0 14px;
  border-bottom: 1px dashed var(--moss-line);
}

.page-about .rec:first-child {
  padding-top: 6px;
}

.page-about .rec:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .rec__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
}

.page-about .rec__score {
  font-family: var(--font-num);
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--ink-700);
  padding-left: 12px;
  border-left: 4px solid var(--moss);
}

.page-about .rec__score--home {
  border-left-color: var(--orange);
}

.page-about .rec__score--away {
  border-left-color: var(--erhai);
}

.page-about .rec__score--draw {
  border-left-color: var(--moss);
}

.page-about .rec__meta {
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--moss);
}

.page-about .rec__note {
  margin: 10px 0 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--text);
  max-width: 62ch;
}

.page-about .rec__more {
  margin-top: 8px;
}

.page-about .rec__more summary {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  list-style: none;
  font-size: var(--step--1);
  font-weight: 700;
  color: var(--erhai-deep);
  transition: color var(--dur) var(--ease);
}

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

.page-about .rec__more summary::before {
  content: "+";
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 15px;
  color: var(--orange);
}

.page-about .rec__more[open] summary::before {
  content: "–";
}

.page-about .rec__more summary:hover,
.page-about .rec__more summary:focus-visible {
  color: var(--orange-deep);
}

.page-about .rec__detail {
  margin-top: 10px;
  padding: 12px 0 12px 16px;
  border-left: 2px solid var(--mist);
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--text);
}

.page-about .rec__detail p {
  margin: 0 0 8px;
}

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

.page-about .rec__jump a {
  color: var(--erhai-deep);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .rec__jump a:hover,
.page-about .rec__jump a:focus-visible {
  color: var(--orange-deep);
  border-color: var(--orange);
}

/* 走势小结 */
.page-about .trend-panel {
  background: var(--paper-200);
  border-radius: 4px 34px 4px 4px;
  padding: 22px 20px 22px;
  align-self: start;
}

.page-about .trend-panel__title {
  margin: 0;
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-700);
}

.page-about .trend-panel__note {
  margin: 8px 0 0;
  font-size: var(--step--2);
  line-height: 1.6;
  color: var(--moss);
}

.page-about .trend-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .trend-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 8px;
}

.page-about .trend-row__year {
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ink-700);
}

.page-about .trend-row__track {
  position: relative;
  height: 10px;
  border-radius: 999px;
  background: rgba(20, 49, 42, 0.08);
}

.page-about .trend-row__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(210, 118, 47, 0.45), var(--orange));
  transition: filter var(--dur) var(--ease);
}

.page-about .trend-row__fill--away {
  background: linear-gradient(90deg, rgba(59, 124, 147, 0.42), var(--erhai));
}

.page-about .trend-row__fill--flat {
  background: linear-gradient(90deg, rgba(124, 139, 128, 0.35), var(--moss));
}

.page-about .trend-row__track::after {
  content: attr(data-tip);
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  max-width: min(230px, 72vw);
  padding: 7px 10px;
  background: var(--ink-900);
  color: var(--paper-100);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.45;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  z-index: 5;
}

.page-about .trend-row__track:hover::after,
.page-about .trend-row__track:focus-within::after {
  opacity: 1;
  transform: translateY(0);
}

.page-about .trend-row__val {
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 700;
  text-align: right;
  color: var(--moss);
}

.page-about .trend-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--moss);
}

.page-about .trend-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .trend-legend__chip {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  display: inline-block;
  background: var(--orange);
}

.page-about .trend-legend__chip--away {
  background: var(--erhai);
}

.page-about .trend-legend__chip--flat {
  background: var(--moss);
}

.page-about .trend-panel__hand {
  margin: 16px 0 0;
  display: block;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--annotate);
}

.page-about .trend-panel__img {
  display: block;
  width: 100%;
  height: 260px;
  object-fit: cover;
  margin-top: 18px;
  border-radius: 3px 26px 3px 3px;
  filter: saturate(0.88);
}

/* 跨栏目跳转 */
.page-about .jump-out {
  display: grid;
  gap: 26px;
  margin: 68px 0 76px;
  padding-top: 40px;
  border-top: 2px solid var(--ink-700);
}

.page-about .jump-out__figure {
  margin: 0;
}

.page-about .jump-out__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  border-radius: 3px 34px 3px 3px;
  filter: saturate(0.85);
}

.page-about .jump-out__title {
  margin: 0;
  font-size: var(--step-2);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
  color: var(--ink-700);
}

.page-about .jump-out__lede {
  margin: 12px 0 0;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--text);
  max-width: 56ch;
}

.page-about .jump-out__links {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .jump-out__link {
  display: block;
  height: 100%;
  padding: 16px 18px;
  background: var(--paper-100);
  border: 1px solid var(--line);
  border-radius: 3px 22px 3px 3px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .jump-out__link:hover,
.page-about .jump-out__link:focus-visible {
  border-color: var(--orange);
  background: var(--paper-200);
  transform: translateY(-2px);
}

.page-about .jump-out__link strong {
  display: block;
  font-size: var(--step-0);
  font-weight: 800;
  color: var(--ink-700);
  margin-bottom: 6px;
}

.page-about .jump-out__link span {
  display: block;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--moss);
}

/* 平板及以上 */
@media (min-width: 640px) {
  .page-about .head-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 32px;
  }

  .page-about .filter-bar {
    padding: 30px 30px 26px;
  }

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

/* 桌面三栏 */
@media (min-width: 1024px) {
  .page-about .history-layout {
    grid-template-columns: var(--ax-rail) minmax(0, 1fr) var(--ax-float);
    gap: 40px 38px;
  }

  .page-about .year-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .trend-panel {
    position: sticky;
    top: 96px;
    max-height: calc(100vh - 128px);
    overflow-y: auto;
  }

  .page-about .year-axis__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 4px 0 4px 16px;
    border-left: 2px dashed var(--moss-line);
    scrollbar-width: none;
  }

  .page-about .year-axis__item {
    flex: 0 0 auto;
  }

  .page-about .year-axis__link {
    display: block;
    width: 100%;
    padding: 8px 0;
    font-size: var(--step--1);
    background: none;
    border: 0;
    border-radius: 0;
    color: var(--ink-700);
  }

  .page-about .year-axis__link::before {
    content: "";
    position: absolute;
    left: -23px;
    top: 50%;
    width: 10px;
    height: 10px;
    margin-top: -5px;
    border-radius: 50%;
    background: var(--moss);
    transition: background var(--dur) var(--ease), transform var(--dur) var(--ease),
      box-shadow var(--dur) var(--ease);
  }

  .page-about .year-axis__link:hover::before,
  .page-about .year-axis__link:focus-visible::before {
    background: var(--orange);
    transform: scale(1.2);
  }

  .page-about .year-axis__item[data-current] .year-axis__link {
    background: none;
    color: var(--orange-deep);
    font-weight: 800;
  }

  .page-about .year-axis__item[data-current] .year-axis__link::before {
    background: var(--orange);
    box-shadow: 0 0 0 4px rgba(210, 118, 47, 0.2);
    transform: scale(1.15);
  }

  .page-about .jump-out {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

@media (min-width: 1280px) {
  .page-about .jump-out {
    grid-template-columns: 320px minmax(0, 1fr);
  }

  .page-about .trend-panel__img {
    height: 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .filter-tag,
  .page-about .year-axis__link,
  .page-about .trend-row__fill,
  .page-about .trend-row__track::after,
  .page-about .jump-out__link,
  .page-about .rec__more summary {
    transition: none;
  }

  .page-about .filter-tag:hover,
  .page-about .jump-out__link:hover {
    transform: none;
  }
}