/* ===== 品牌坐标 / about ===== */
.page-about {
  background: var(--ink);
  color: var(--body);
  padding-bottom: 72px;
}

.page-about .about-top {
  padding-top: 26px;
}

/* ---- 面包屑 ---- */
.page-about .about-top .breadcrumb {
  display: block;
  margin-bottom: 22px;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-top .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-top .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .about-top .breadcrumb a {
  color: var(--mute);
  text-decoration: none;
}

.page-about .about-top .breadcrumb a:hover {
  color: var(--green);
}

.page-about .about-top .breadcrumb li[aria-current] {
  color: var(--green);
}

/* ---- 报头 ---- */
.page-about .about-head {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding: 30px 16px 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 1px;
  background: var(--line);
}

.page-about .about-kicker {
  margin: 0 0 16px;
  font-family: var(--font-cond);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--green);
}

.page-about .about-title {
  margin: 0 0 18px;
  font-family: var(--font-mast);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--hi);
}

.page-about .about-lede {
  max-width: 60ch;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  max-width: 640px;
  margin: 28px auto 0;
  padding: 0;
  list-style: none;
  text-align: left;
}

.page-about .about-meta li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.page-about .about-meta__num {
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--hi);
}

.page-about .about-meta__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mute);
}

/* ---- 通栏封面 ---- */
.page-about .about-cover {
  position: relative;
  margin: 36px 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.05);
}

.page-about .about-cover__cap {
  position: absolute;
  left: 16px;
  bottom: 14px;
  max-width: calc(100% - 32px);
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--body);
}

/* ---- 主体双栏 ---- */
.page-about .about-body {
  padding-top: 48px;
}

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

.page-about .about-index {
  min-width: 0;
  margin-bottom: 34px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-cond);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .toc__link {
  display: block;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.5;
  color: var(--body);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .toc__link:hover {
  color: var(--hi);
  border-color: var(--green);
}

.page-about .toc__link.is-active,
.page-about .toc__link[aria-current] {
  color: var(--hi);
  border-color: var(--green);
  background: var(--panel);
}

/* ---- 章节骨架 ---- */
.page-about .about-sec {
  scroll-margin-top: 100px;
}

.page-about .about-flow > .about-sec + .about-sec {
  margin-top: 58px;
  padding-top: 44px;
  border-top: 1px solid var(--line);
}

.page-about .sec-tag {
  display: block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-sec h2 {
  margin: 0 0 8px;
  font-family: var(--font-cond);
  font-size: 23px;
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--hi);
}

.page-about .sec-note {
  margin: 0 0 22px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--body);
}

.page-about .about-p {
  max-width: 68ch;
  margin: 0 0 1.15em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body);
}

.page-about .about-p a {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 3px;
  transition: color 0.16s ease, text-decoration-color 0.16s ease;
}

.page-about .about-p a:hover {
  color: var(--green);
  text-decoration-color: var(--green);
}

/* ---- 坐标章节横幅 ---- */
.page-about .about-coordband {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-coordband img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.07);
}

/* ---- 版本时间线 ---- */
.page-about .tl {
  margin: 6px 0 20px;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .tl__item:last-child {
  padding-bottom: 4px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--green);
}

.page-about .tl__ver {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--hi);
}

.page-about .tl__text {
  max-width: 66ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body);
}

/* ---- 比赛日班次 ---- */
.page-about .shift {
  margin: 8px 0 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .shift__row {
  display: grid;
  gap: 6px;
  padding: 15px 16px;
  background: var(--panel);
}

.page-about .shift__row + .shift__row {
  border-top: 1px solid var(--line);
}

.page-about .shift__time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .shift__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body);
}

/* ---- 团队构成 ---- */
.page-about .team-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 8px 0 22px;
}

.page-about .team-cell {
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.16s ease, transform 0.16s ease, background-color 0.16s ease;
}

.page-about .team-cell:hover,
.page-about .team-cell:focus-within,
.page-about .team-cell:focus-visible {
  border-color: var(--green);
  background: var(--raise);
  transform: translateY(-2px);
  outline: none;
}

.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--hi);
}

.page-about .team-name {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--body);
}

.page-about .team-role {
  max-height: 160px;
  margin: 10px 0 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
  transition: max-height 0.2s ease, opacity 0.2s ease, margin-top 0.2s ease;
}

/* ---- 数据质量 ---- */
.page-about .quality {
  display: grid;
  gap: 26px;
  margin: 8px 0 0;
}

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

.page-about .quality__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

.page-about .quality__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.65) contrast(1.06);
}

.page-about .quality__copy .accordion {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

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

/* ---- 合作与荣誉 ---- */
.page-about .stats-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 6px 0 24px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 12px;
  background: var(--panel);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green);
}

.page-about .stat-label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--body);
}

.page-about .pullnote {
  max-width: 58ch;
  margin: 30px 0;
  padding: 6px 0 6px 20px;
  border-left: 2px solid var(--green);
  font-family: var(--font-mast);
  font-size: 17px;
  line-height: 1.78;
  color: var(--hi);
}

/* ---- 收尾 ---- */
.page-about .about-coda {
  margin-top: 56px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.page-about .about-coda p {
  max-width: 56ch;
  margin: 0;
  font-family: var(--font-mast);
  font-size: 16px;
  line-height: 1.85;
  color: var(--body);
}

/* ---- 浮动回到时间线 ---- */
.page-about .about-jump {
  position: fixed;
  left: 14px;
  bottom: 14px;
  z-index: 30;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--raise);
  font-family: var(--font-cond);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
  text-decoration: none;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.page-about .about-jump::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

.page-about .about-jump:hover {
  border-color: var(--green);
}

.page-about .about-jump:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

/* ================= 响应式 ================= */
@media (min-width: 640px) {
  .page-about .about-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-meta__num {
    font-size: 21px;
  }

  .page-about .stat {
    padding: 22px 18px;
  }

  .page-about .stat-num {
    font-size: 32px;
  }
}

@media (min-width: 760px) {
  .page-about .about-title {
    font-size: 36px;
    line-height: 1.24;
  }

  .page-about .about-lede {
    font-size: 17px;
  }

  .page-about .about-sec h2 {
    font-size: 31px;
  }

  .page-about .about-p {
    font-size: 16px;
  }

  .page-about .shift__row {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
    padding: 18px 22px;
  }

  .page-about .pullnote {
    font-size: 20px;
    line-height: 1.72;
  }

  .page-about .about-coda p {
    font-size: 18px;
  }
}

@media (min-width: 860px) {
  .page-about .quality {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .team-map {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .team-cell--a {
    grid-column: span 7;
  }

  .page-about .team-cell--b {
    grid-column: span 5;
  }

  .page-about .team-cell--c {
    grid-column: span 6;
  }

  .page-about .team-cell--d {
    grid-column: span 6;
  }
}

@media (min-width: 860px) and (hover: hover) {
  .page-about .team-role {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
  }

  .page-about .team-cell:hover .team-role,
  .page-about .team-cell:focus-within .team-role,
  .page-about .team-cell:focus-visible .team-role {
    max-height: 160px;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
    padding-top: 62px;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-index__list li {
    flex: none;
  }

  .page-about .toc__link {
    padding: 7px 0 7px 15px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    white-space: normal;
    background: none;
  }

  .page-about .toc__link:hover {
    border-left-color: var(--green);
  }

  .page-about .toc__link.is-active,
  .page-about .toc__link[aria-current] {
    color: var(--green);
    border-left-color: var(--green);
    background: none;
  }

  .page-about .about-cover {
    margin-top: 44px;
  }

  .page-about .about-cover__cap {
    left: 32px;
    bottom: 22px;
  }

  .page-about .about-jump {
    left: 28px;
    bottom: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-cell,
  .page-about .team-role,
  .page-about .toc__link,
  .page-about .about-jump {
    transition: none;
  }

  .page-about .team-cell:hover,
  .page-about .team-cell:focus-within {
    transform: none;
  }
}