.page-about {
  --ab-toc: 232px;
  --ab-card-cut: 14px;
  background: var(--ink);
  color: var(--cloud);
}
.page-about .wrap {
  width: 100%;
}

/* 面包屑 */
.page-about .crumb {
  padding-top: calc(var(--head-h) + 1.5rem);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-about .crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .crumb a:hover {
  color: var(--neon);
  border-bottom-color: var(--line-neon);
}
.page-about .crumb .crumb-sep {
  margin: 0 0.5em;
  color: var(--line);
}
.page-about .crumb [aria-current="page"] {
  color: var(--cloud);
}

/* 首屏 */
.page-about .about-hero {
  padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
}
.page-about .about-hero__h1 {
  font-family: var(--display);
  font-size: clamp(2rem, 6vw, 4.1rem);
  line-height: 0.99;
  letter-spacing: -0.02em;
  margin: 0.85rem 0 0;
  max-width: 21ch;
  color: var(--cloud);
  text-transform: none;
}
.page-about .about-hero__h1 em {
  font-style: normal;
  color: var(--neon);
  display: block;
}
.page-about .about-hero__lede {
  margin-top: clamp(1rem, 2.6vw, 1.6rem);
  max-width: 58ch;
  font-family: var(--serif);
  font-size: clamp(1rem, 2.1vw, 1.22rem);
  line-height: 1.8;
  color: var(--cloud);
}
.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
}
.page-about .hero-stats .stat {
  background: var(--ink);
  padding: 1.05rem 0.95rem 1.15rem;
}
.page-about .hero-stats .stat__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  line-height: 1.05;
  color: var(--amber);
}
.page-about .hero-stats .stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.76rem;
  line-height: 1.55;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* 图片容器 */
.page-about .media {
  position: relative;
  display: block;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0 var(--cut) var(--cut) var(--cut);
  background: var(--ink-2);
}
.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media--wide .media__img {
  aspect-ratio: 16 / 9;
}
.page-about .media--tall .media__img {
  aspect-ratio: 10 / 7;
}
.page-about .media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 13, 20, 0) 42%, rgba(8, 13, 20, 0.86) 100%);
  pointer-events: none;
}
.page-about .media__tag {
  position: absolute;
  left: 0.9rem;
  bottom: 0.9rem;
  z-index: 2;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--cloud);
  background: rgba(8, 13, 20, 0.66);
  border: 1px solid var(--line-neon);
  padding: 0.3rem 0.62rem;
}

/* 正文骨架 */
.page-about .about-body {
  display: grid;
  grid-template-columns: var(--ab-toc) minmax(0, 1fr);
  gap: clamp(1.8rem, 5vw, 4.2rem);
  align-items: start;
  padding: clamp(2.2rem, 5vw, 4rem) 0 clamp(3rem, 7vw, 5.5rem);
}

/* 章节导航 */
.page-about .about-toc {
  position: sticky;
  top: calc(var(--head-h) + 1.6rem);
  align-self: start;
}
.page-about .toc-h {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 0.9rem;
}
.page-about .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}
.page-about .toc-list li {
  margin: 0;
}
.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.55rem 0 0.55rem 0.9rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--mist);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.page-about .toc-link:hover {
  color: var(--cloud);
  border-left-color: var(--line-neon);
  background: var(--glass);
}
.page-about .toc-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
  color: var(--amber);
}

/* 章节通用 */
.page-about .chapter {
  padding-top: clamp(1.6rem, 4vw, 2.6rem);
}
.page-about .chapter + .chapter {
  margin-top: clamp(2.4rem, 6vw, 4rem);
  border-top: 1px solid var(--line);
}
.page-about .chapter__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--amber);
  margin: 0 0 0.7rem;
}
.page-about .chapter__h {
  font-family: var(--display);
  font-size: clamp(1.5rem, 3.6vw, 2.45rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--cloud);
  margin: 0;
  max-width: 24ch;
}
.page-about .chapter__lede {
  font-family: var(--serif);
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  line-height: 1.8;
  color: var(--cloud);
  max-width: var(--w-read);
  margin: 0.9rem 0 0;
}
.page-about .chapter__cta {
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

/* 三条日常主线 */
.page-about .line-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 0 var(--ab-card-cut) var(--ab-card-cut) var(--ab-card-cut);
  overflow: hidden;
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}
.page-about .line-card {
  background: var(--ink-2);
  padding: clamp(1.1rem, 2.6vw, 1.7rem);
  transition: background var(--ease), box-shadow var(--ease);
}
.page-about .line-card:hover {
  background: #12233a;
  box-shadow: inset 0 0 0 1px var(--line-neon);
}
.page-about .line-card__no {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--neon);
  padding: 0.22rem 0.5rem;
  margin: 0 0 0.85rem;
}
.page-about .line-card__h {
  font-size: 1.06rem;
  line-height: 1.4;
  color: var(--cloud);
  margin: 0 0 0.6rem;
}
.page-about .line-card p:last-child {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

/* 栏目索引条 */
.page-about .index-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.5rem 0.8rem;
  margin-top: clamp(1.3rem, 3vw, 2rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}
.page-about .index-item {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.86rem;
  color: var(--cloud);
}
.page-about .index-no {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
  color: var(--amber);
}

/* 内容组织 */
.page-about .struct {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: clamp(1.4rem, 3.6vw, 2.6rem);
  align-items: start;
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}
.page-about .struct__text p {
  font-size: 1rem;
  line-height: 1.88;
  color: var(--cloud);
  max-width: var(--w-read);
  margin: 0 0 1rem;
}
.page-about .struct__media {
  margin-top: 0;
}

/* 专题筛选 */
.page-about .topic-filter {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}
.page-about .chipbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-about .chip {
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.42rem 0.9rem;
  cursor: pointer;
  border-radius: 0 var(--cut-sm) var(--cut-sm) var(--cut-sm);
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.page-about .chip:hover {
  color: var(--cloud);
  border-color: var(--line-neon);
}
.page-about .chip[aria-pressed="true"] {
  color: var(--ink);
  background: var(--volt);
  border-color: var(--volt);
}
.page-about .chip-status {
  margin: 0.7rem 0 0;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  min-height: 1em;
}

/* 专题卡片 */
.page-about .topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}
.page-about .topic-card {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.5rem);
  border: 1px solid var(--line);
  border-radius: 0 var(--ab-card-cut) var(--ab-card-cut) var(--ab-card-cut);
  overflow: hidden;
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.page-about .topic-card--indigo {
  background: var(--indigo);
}
.page-about .topic-card--wine {
  background: var(--wine);
}
.page-about .topic-card--deck {
  background: var(--ink-2);
}
.page-about .topic-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 16px;
  height: 16px;
  background: linear-gradient(225deg, var(--neon) 0 50%, transparent 50%);
  transition: width var(--ease), height var(--ease);
}
.page-about .topic-card:hover {
  border-color: var(--line-neon);
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}
.page-about .topic-card:hover::before {
  width: 26px;
  height: 26px;
}
.page-about .topic-card__theme {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--volt);
  margin: 0 0 0.7rem;
}
.page-about .topic-card--wine .topic-card__theme {
  color: var(--amber);
}
.page-about .topic-card__h {
  font-size: 1.04rem;
  line-height: 1.42;
  color: var(--cloud);
  margin: 0 0 0.55rem;
}
.page-about .topic-card__p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}
.page-about .topic-card__meta {
  margin: 0.9rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(242, 246, 250, 0.12);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cloud);
}

/* 版本时间轴 */
.page-about .timeline {
  list-style: none;
  margin: clamp(1.4rem, 3.4vw, 2.2rem) 0 0;
  padding: 0 0 0 1.4rem;
  border-left: 2px solid var(--line-neon);
}
.page-about .ver {
  position: relative;
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 1rem;
  padding: 0.85rem 1rem 0.85rem 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--ease), padding-left var(--ease);
}
.page-about .ver:last-child {
  border-bottom: none;
}
.page-about .ver::before {
  content: "";
  position: absolute;
  left: calc(-1.4rem - 6px);
  top: 1.35rem;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 2px solid var(--neon);
  transform: rotate(45deg);
}
.page-about .ver:hover {
  background: var(--glass);
  padding-left: 0.8rem;
}
.page-about .ver__no {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  color: var(--amber);
  letter-spacing: 0.06em;
  align-self: start;
  padding-top: 0.1rem;
}
.page-about .ver__h {
  font-size: 1rem;
  line-height: 1.45;
  color: var(--cloud);
  margin: 0 0 0.3rem;
}
.page-about .ver__detail {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}

/* 赛季节奏 */
.page-about .chapter--rhythm {
  position: relative;
  padding: clamp(1.8rem, 4.5vw, 3rem) clamp(1rem, 3vw, 2.2rem);
  border-radius: 0 var(--cut) 0 var(--cut);
  overflow: hidden;
  background: linear-gradient(140deg, #1a0a13 0%, #0c1220 62%, var(--ink) 100%);
}
.page-about .chapter--rhythm + .chapter {
  border-top: none;
}
.page-about .rhythm-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.page-about .rhythm-bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.14;
  filter: grayscale(1) contrast(1.25);
}
.page-about .rhythm-inner {
  position: relative;
  z-index: 1;
}
.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: clamp(1.3rem, 3.2vw, 2rem);
}
.page-about .rhythm-item {
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--line-neon);
}
.page-about .rhythm-num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--amber);
}
.page-about .rhythm-h {
  font-size: 0.88rem;
  letter-spacing: 0.14em;
  color: var(--neon);
  margin: 0.4rem 0 0.5rem;
}
.page-about .rhythm-item p {
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--cloud);
  margin: 0;
}

/* 数据更新 */
.page-about .data-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: clamp(1.4rem, 3.4vw, 2.2rem);
}
.page-about .data-card {
  padding: clamp(1.1rem, 2.4vw, 1.5rem);
  background: var(--indigo);
  border: 1px solid var(--line);
  border-left: 3px solid var(--volt);
  border-radius: 0 var(--cut) var(--cut) 0;
}
.page-about .data-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  line-height: 1;
  color: var(--cloud);
  margin: 0 0 0.8rem;
}
.page-about .data-unit {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--volt);
  margin-left: 0.35rem;
}
.page-about .data-h {
  font-size: 1rem;
  line-height: 1.45;
  color: var(--cloud);
  margin: 0 0 0.5rem;
}
.page-about .data-card p:last-child {
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}
.page-about .data-note {
  margin-top: 1rem;
  padding: clamp(1.1rem, 2.4vw, 1.5rem);
}
.page-about .data-note__h {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--cloud);
  margin: 0 0 0.55rem;
}
.page-about .data-note p {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--mist);
  margin: 0;
  max-width: var(--w-read);
}

/* 结尾指向 */
.page-about .chapter--closing {
  border-top: 1px solid var(--line-neon);
}
.page-about .closing-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}
.page-about .closing-link {
  display: block;
  padding: clamp(1rem, 2.4vw, 1.4rem);
  background: var(--ink-2);
  text-decoration: none;
  transition: background var(--ease);
}
.page-about .closing-link:hover {
  background: #14273f;
}
.page-about .closing-link__h {
  display: block;
  font-family: var(--display);
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--neon);
  margin-bottom: 0.45rem;
}
.page-about .closing-link__p {
  display: block;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--mist);
}

/* 响应式 */
@media (max-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 1fr;
  }
  .page-about .about-toc {
    position: sticky;
    top: var(--head-h);
    z-index: 6;
    padding: 0.7rem 0;
    background: rgba(8, 13, 20, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .page-about .toc-h {
    display: none;
  }
  .page-about .toc-list {
    display: flex;
    gap: 0.4rem;
    overflow-x: auto;
    border-left: none;
    scrollbar-width: none;
  }
  .page-about .toc-list::-webkit-scrollbar {
    display: none;
  }
  .page-about .toc-link {
    white-space: nowrap;
    padding: 0.4rem 0.75rem;
    margin-left: 0;
    border-left: none;
    border: 1px solid var(--line);
    border-radius: 0 var(--cut-sm) var(--cut-sm) var(--cut-sm);
    font-size: 0.84rem;
  }
  .page-about .toc-link:hover {
    background: var(--glass);
  }
}

@media (max-width: 860px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .line-grid,
  .page-about .topic-grid,
  .page-about .rhythm-grid,
  .page-about .data-grid,
  .page-about .closing-links {
    grid-template-columns: 1fr;
  }
  .page-about .struct {
    grid-template-columns: 1fr;
  }
  .page-about .struct__media {
    order: -1;
  }
  .page-about .index-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-about .hero-stats {
    grid-template-columns: 1fr;
  }
  .page-about .index-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ver {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
  .page-about .chapter--rhythm {
    padding-inline: 1rem;
  }
  .page-about .about-hero__h1 {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
  }
  .page-about .topic-card:hover {
    transform: none;
  }
}