.page-about {
  --about-measure: 34em;
  --about-stage-1: #14614A;
  --about-stage-2: #1E7A5C;
  --about-stage-3: #00E5FF;
  padding-bottom: calc(var(--dash-h) + 64px);
}

.page-about .breadcrumb {
  padding-top: 40px;
}

/* ===== 首屏：左侧叙事 + 右侧快照 ===== */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-top: 32px;
  padding-bottom: 8px;
}

.page-about .about-hero__title {
  margin: 16px 0 20px;
  font-family: var(--font-head);
  font-size: clamp(38px, 8vw, 72px);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-hero__sub {
  max-width: var(--about-measure);
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .about-hero__card {
  border: 2px solid var(--line);
  background: var(--pitch-deep);
  box-shadow: 8px 8px 0 var(--shadow-solid);
  padding: 20px 22px;
}

.page-about .about-hero__card-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-about .about-facts {
  margin: 0;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-facts__row dt {
  font-size: 14px;
  color: var(--ink-2);
}

.page-about .about-facts__row dd {
  margin: 0;
  font-size: 32px;
  line-height: 1;
  color: var(--neon);
}

/* ===== 目录 ===== */
.page-about .about-contents {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 2px solid var(--line);
}

.page-about .about-contents__list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-contents__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contents__num {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--corner);
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
}

.page-about .about-contents__link {
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-contents__link:hover,
.page-about .about-contents__link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ===== 页首横图 ===== */
.page-about .about-banner {
  margin: 56px auto 0;
}

.page-about .about-banner__frame {
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 var(--shadow-solid);
  background: var(--pitch-deep);
}

.page-about .about-banner__frame .media-frame__img,
.page-about .about-roster__frame .media-frame__img,
.page-about .about-timeline-figure__frame .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-banner .media-frame__caption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ===== 章节通用骨架 ===== */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 64px 0 8px;
}

.page-about .about-chapter__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(52px, 12vw, 96px);
  font-weight: 300;
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--line);
  font-variant-numeric: tabular-nums;
  transition: color var(--ease);
}

.page-about .about-chapter__body > h2 {
  margin: 0 0 20px;
}

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-chapter__body p {
  max-width: var(--about-measure);
  font-size: 15px;
  line-height: 1.95;
  color: var(--ink);
}

.page-about .about-chapter__body p + p {
  margin-top: 16px;
}

.page-about .about-link {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--pitch);
  background: var(--neon);
}

/* ===== 旁注 ===== */
.page-about .note {
  max-width: var(--about-measure);
  margin: 26px 0;
  padding: 14px 0 14px 18px;
  border-left: 3px solid var(--corner);
}

.page-about .note .note__index {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--corner);
}

.page-about .about-chapter__body .note p {
  max-width: 30em;
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ===== 赛季节拍 ===== */
.page-about .about-beats {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: 620px;
}

.page-about .about-beats__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: 14px 0 14px 14px;
  border-left: 2px solid var(--line);
}

.page-about .about-beats__item:hover {
  border-left-color: var(--neon);
}

.page-about .about-beats__time {
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-beats__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-beats__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ===== 团队清单 ===== */
.page-about .about-roster-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 28px;
}

.page-about .about-roster {
  border-top: 2px solid var(--line);
}

.page-about .about-roster__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "role num"
    "desc desc";
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--ease);
}

.page-about .about-roster__row:hover {
  background: rgba(30, 122, 92, 0.14);
}

.page-about .about-roster__role {
  grid-area: role;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-roster__num {
  grid-area: num;
  font-family: var(--font-num);
  font-size: 40px;
  line-height: 1;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
  transition: color var(--ease);
}

.page-about .about-roster__row:hover .about-roster__num {
  color: var(--neon);
}

.page-about .about-roster__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-2);
  transition: color var(--ease);
}

.page-about .about-roster__row:hover .about-roster__desc {
  color: var(--ink);
}

.page-about .about-roster__aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-roster__frame {
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 var(--shadow-solid);
  background: var(--pitch-deep);
}

.page-about .about-roster__note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ===== 三级审核阶梯 ===== */
.page-about .about-steps {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  max-width: 620px;
}

.page-about .about-steps__stage {
  position: relative;
  padding: 18px 18px 18px 20px;
  border: 2px solid var(--line);
  background: var(--panel);
  outline: none;
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .about-steps__stage:hover,
.page-about .about-steps__stage:focus-visible {
  border-color: var(--neon);
  transform: translateX(3px);
}

.page-about .about-steps__bar {
  display: block;
  height: 6px;
  margin-bottom: 16px;
}

.page-about .about-steps__bar--1 {
  width: 34%;
  background: var(--about-stage-1);
}

.page-about .about-steps__bar--2 {
  width: 62%;
  background: var(--about-stage-2);
}

.page-about .about-steps__bar--3 {
  width: 100%;
  background: var(--about-stage-3);
}

.page-about .about-steps__level {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.page-about .about-steps__name {
  margin: 6px 0 12px;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-steps__checks {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .about-steps__checks li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .about-steps__checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--corner);
}

/* ===== 时间轴 ===== */
.page-about .about-timeline-figure {
  margin: 28px 0 32px;
}

.page-about .about-timeline-figure__frame {
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 var(--shadow-solid);
  background: var(--pitch-deep);
}

.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-timeline__stop {
  position: relative;
  padding: 0 0 28px 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__stop:last-child {
  border-left-color: transparent;
  padding-bottom: 8px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--neon);
}

.page-about .about-timeline__name {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ===== 页尾索引 ===== */
.page-about .about-tail {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 2px solid var(--line);
}

.page-about .about-tail__links {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-tail__link {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background-color var(--ease);
}

.page-about .about-tail__link:hover,
.page-about .about-tail__link:focus-visible {
  background: rgba(30, 122, 92, 0.14);
}

.page-about .about-tail__link-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  transition: color var(--ease);
}

.page-about .about-tail__link:hover .about-tail__link-name,
.page-about .about-tail__link:focus-visible .about-tail__link-name {
  color: var(--neon);
}

.page-about .about-tail__link-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ===== 平板 ===== */
@media (min-width: 700px) {
  .page-about .about-contents__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

  .page-about .about-roster__row {
    grid-template-columns: minmax(0, 1fr) 88px minmax(0, 1.2fr);
    grid-template-areas: "role num desc";
    align-items: baseline;
    gap: 8px 20px;
  }

  .page-about .about-roster__num {
    font-size: 36px;
    text-align: right;
  }

  .page-about .about-roster__desc {
    align-self: center;
  }

  .page-about .about-beats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-about .about-tail__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
}

/* ===== 桌面 ===== */
@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
    gap: 64px;
    padding-top: 44px;
  }

  .page-about .about-chapter {
    grid-template-columns: 100px minmax(0, 660px);
    column-gap: 44px;
    padding: 88px 0 8px;
  }

  .page-about .about-chapter--wide {
    grid-template-columns: 100px minmax(0, 1fr);
  }

  .page-about .about-roster-block {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 40px;
  }

  .page-about .about-beats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 20px;
    max-width: none;
  }

  .page-about .about-beats__item {
    border-left: none;
    border-top: 2px solid var(--line);
    padding: 16px 0 0;
  }

  .page-about .about-beats__item:hover {
    border-top-color: var(--neon);
    border-left-color: transparent;
  }

  .page-about .about-steps {
    max-width: none;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-about .about-timeline__stop {
    padding: 20px 0 0;
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .page-about .about-timeline__stop:last-child {
    padding-bottom: 0;
    border-top-color: var(--line);
  }

  .page-about .about-timeline__dot {
    left: 0;
    top: -5px;
  }

  .page-about .about-tail__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ===== 动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapter__num,
  .page-about .about-roster__row,
  .page-about .about-roster__num,
  .page-about .about-roster__desc,
  .page-about .about-steps__stage,
  .page-about .about-tail__link,
  .page-about .about-tail__link-name,
  .page-about .about-contents__link {
    transition: none;
  }
}