.page-about {
  --about-pad: clamp(16px, 4vw, 56px);
  --about-max: 1440px;
  --about-rail: 210px;
  --about-ease: cubic-bezier(.2, 0, 0, 1);
  background: var(--turf);
  color: var(--line);
  padding-bottom: 88px;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--about-pad);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 24px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .breadcrumb li + li::before {
  content: "/ ";
  color: rgba(232, 244, 241, .28);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 140ms var(--about-ease), border-color 140ms var(--about-ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding: 36px 0 60px;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 22px;
  font-size: clamp(38px, 6.4vw, 92px);
  font-weight: 200;
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--white);
  transform: skewX(-1.5deg);
  transform-origin: left center;
}

.page-about .about-hero__lead {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(232, 244, 241, .8);
  max-width: 40em;
}

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

.page-about .about-hero__index {
  border-top: 1px solid var(--hairline);
  padding-top: 20px;
}

.page-about .about-hero__index .index-text {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 10px 9px 12px;
  font-size: 13.5px;
  line-height: 1.5;
  color: rgba(232, 244, 241, .72);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 140ms var(--about-ease), color 140ms var(--about-ease), border-color 140ms var(--about-ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  background: var(--turf-2);
  color: var(--white);
  border-left-color: var(--cyan);
}

.page-about .about-index .num {
  font-family: var(--font-num);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: 56px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-chapter:last-of-type {
  border-bottom: 0;
  padding-bottom: 24px;
}

.page-about .about-chapter__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(38px, 5vw, 66px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  color: rgba(62, 242, 200, .34);
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: .01em;
  color: var(--white);
}

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

.page-about .about-chapter--tight .about-chapter__body {
  max-width: 640px;
}

.page-about .about-chapter--loose .about-chapter__body {
  max-width: 880px;
}

/* ---------- 正文 ---------- */
.page-about .prose {
  margin: 0;
}

.page-about .prose p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(232, 244, 241, .82);
  max-width: 38em;
}

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

.page-about .prose strong {
  color: var(--white);
  font-weight: 500;
}

.page-about .about-chapter__body > .prose + .season-line,
.page-about .about-chapter__body > .prose + .team-grid,
.page-about .about-chapter__body > .prose + .flow-wrap,
.page-about .about-chapter__body > .prose + .cover-media,
.page-about .about-chapter__body > .prose + .principles,
.page-about .about-chapter__body > .prose + .next-grid {
  margin-top: 26px;
}

.page-about .about-chapter__body > .facts + .prose {
  margin-top: 26px;
}

.page-about .timestamp {
  margin: 16px 0 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-tail {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 244, 241, .7);
}

.page-about .about-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(62, 242, 200, .4);
  transition: border-color 140ms var(--about-ease);
}

.page-about .about-tail a:hover,
.page-about .about-tail a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--hairline);
  background: var(--turf-2);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--muted);
  max-width: 40em;
}

/* ---------- 赛季时间轴 ---------- */
.page-about .season-line {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .season-line::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(62, 242, 200, .78), rgba(232, 244, 241, .1));
}

.page-about .season-line__item {
  position: relative;
  padding-bottom: 34px;
}

.page-about .season-line__item:last-child {
  padding-bottom: 0;
}

.page-about .season-line__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--turf);
  border: 2px solid var(--cyan);
}

.page-about .season-line__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .season-line__phase {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .14em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .season-line__title {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--white);
}

.page-about .season-line__text {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(232, 244, 241, .78);
  max-width: 38em;
}

.page-about .season-line__more {
  max-width: 38em;
  border-top: 1px solid var(--hairline);
  padding-top: 6px;
}

.page-about .season-line__more summary {
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--muted);
  transition: color 140ms var(--about-ease);
}

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

.page-about .season-line__more summary::before {
  content: "＋ ";
  color: var(--cyan);
}

.page-about .season-line__more[open] summary::before {
  content: "− ";
}

.page-about .season-line__more summary:hover,
.page-about .season-line__more summary:focus-visible {
  color: var(--cyan);
}

.page-about .season-line__more ul {
  list-style: none;
  margin: 6px 0 10px;
  padding: 0;
}

.page-about .season-line__more li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 244, 241, .72);
}

.page-about .season-line__more li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 6px;
  height: 1px;
  background: rgba(62, 242, 200, .7);
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-panel {
  position: relative;
  background: var(--turf-2);
  border-left: 2px solid rgba(62, 242, 200, .28);
  padding: 18px 18px 20px 20px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: background 160ms var(--about-ease), border-color 160ms var(--about-ease);
}

.page-about .team-panel:hover,
.page-about .team-panel:focus-within {
  background: var(--turf-3);
  border-left-color: var(--cyan);
}

.page-about .team-panel__top {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .team-panel__count {
  font-family: var(--font-num);
  font-size: 32px;
  font-weight: 300;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .team-panel__unit {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .team-panel__role {
  margin: 10px 0 6px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .01em;
  color: var(--white);
}

.page-about .team-panel__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(232, 244, 241, .72);
}

.page-about .team-panel__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--hairline);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
  transition: color 160ms var(--about-ease);
}

.page-about .team-panel:hover .team-panel__note,
.page-about .team-panel:focus-within .team-panel__note {
  color: var(--amber);
}

/* ---------- 数据加工流程 ---------- */
.page-about .flow-wrap {
  background-color: rgba(6, 17, 14, .55);
  background-image:
    linear-gradient(rgba(232, 244, 241, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 244, 241, .045) 1px, transparent 1px);
  background-size: 48px 48px;
  border: 1px solid var(--hairline);
}

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

.page-about .flow__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--hairline);
  transition: background 150ms var(--about-ease);
}

.page-about .flow__item:last-child {
  border-bottom: 0;
}

.page-about .flow__item:hover,
.page-about .flow__item:focus-within {
  background: rgba(62, 242, 200, .05);
}

.page-about .flow__time {
  display: block;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .flow__body h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
}

.page-about .flow__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 244, 241, .74);
  max-width: 40em;
}

/* ---------- 覆盖范围 ---------- */
.page-about .cover-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--ink);
}

.page-about .cover-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .cover-media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--line);
  background: rgba(6, 17, 14, .84);
  border-top: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
}

.page-about .facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--turf);
}

.page-about .facts__num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-num);
  font-size: 28px;
  font-weight: 300;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .facts__unit {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .facts__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 内容准则 ---------- */
.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .principles li {
  border-left: 2px solid rgba(62, 242, 200, .4);
  padding-left: 16px;
  transition: border-color 150ms var(--about-ease);
}

.page-about .principles li:hover {
  border-left-color: var(--cyan);
}

.page-about .principles h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
}

.page-about .principles p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(232, 244, 241, .75);
  max-width: 40em;
}

/* ---------- 延伸入口 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .next-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--turf-2);
  border: 1px solid var(--hairline);
  padding: 20px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: background 160ms var(--about-ease), border-color 160ms var(--about-ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--turf-3);
  border-color: rgba(62, 242, 200, .45);
}

.page-about .next-card__label {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .next-card__title {
  display: block;
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--white);
}

.page-about .next-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(232, 244, 241, .72);
}

/* ---------- 焦点可达性 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

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

@media (min-width: 720px) {
  .page-about .flow__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding: 20px 24px;
  }

  .page-about .facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    padding: 88px 0;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 120px;
    align-self: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 8fr) minmax(220px, 4fr);
    gap: 64px;
    padding: 56px 0 88px;
  }

  .page-about .about-hero__index {
    border-top: 0;
    border-left: 1px solid var(--hairline);
    padding-top: 0;
    padding-left: 22px;
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-about .facts {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }

  .page-about .about-hero h1 {
    transform: none;
  }
}