/* ================= 品牌档案页 /about/ ================= */
.page-about {
  --ab-c-space: var(--c-space);
  --ab-c-orange: var(--c-orange);
  --ab-c-gold: var(--c-gold);
  --ab-c-offwhite: var(--c-cloud);
  --ab-c-ink: var(--c-ink);
  --ab-c-muted: #5e6a7a;
  --ab-c-line: var(--c-line);
  --ab-c-deep: var(--c-deep);
  --ab-c-data: var(--c-data);
  --ab-num-low: rgba(11, 27, 59, 0.07);
  --ab-section-gap: 72px;

  background: var(--ab-c-offwhite);
  color: var(--ab-c-ink);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 24px 20px 0;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.8125rem;
  font-family: var(--font-data);
}
.page-about .breadcrumb__item {
  color: var(--ab-c-muted);
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "▸";
  margin-right: 8px;
  color: var(--ab-c-gold);
  font-size: 0.6875rem;
}
.page-about .breadcrumb__link {
  color: var(--ab-c-data);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.page-about .breadcrumb__link:hover {
  color: var(--ab-c-orange);
  border-bottom-color: var(--ab-c-orange);
}

/* 首屏框景 */
.page-about .about-hero {
  padding: 40px 20px 56px;
}
.page-about .about-hero__frame {
  max-width: var(--container-w);
  margin: 0 auto;
  background-color: var(--ab-c-space);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  border: 1px solid rgba(201, 162, 39, 0.4);
  color: var(--ab-c-offwhite);
  position: relative;
}
.page-about .about-hero__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.page-about .about-hero__edition {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: rgba(244, 246, 250, 0.7);
  letter-spacing: 0.04em;
}
.page-about .about-hero__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 32px 20px 40px;
}
.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ab-c-gold);
}
.page-about .about-hero__eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--ab-c-gold);
}
.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-size: clamp(1.875rem, 5vw + 0.75rem, 2.5rem);
  line-height: 1.2;
  color: #ffffff;
  max-width: 620px;
}
.page-about .about-hero__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 246, 250, 0.85);
  max-width: 620px;
}
.page-about .about-hero__stats {
  display: flex;
  align-items: stretch;
}
.page-about .about-hero__stats .frame-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
  background: rgba(244, 246, 250, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.16);
  padding: 18px;
}
.page-about .about-hero__stat-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 8px;
}
.page-about .about-hero__stat-label {
  font-size: 0.8125rem;
  color: rgba(244, 246, 250, 0.7);
}
.page-about .data-highlight {
  font-family: var(--font-data);
  color: var(--ab-c-orange);
}

/* 大篇幅内容布局 */
.page-about .about-layout-wrap {
  padding: 0 20px;
}
.page-about .about-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* 章节目录 */
.page-about .about-toc {
  padding: 20px;
  border: 1px solid var(--ab-c-line);
  background: #ffffff;
}
.page-about .about-toc__label {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ab-c-gold);
  text-transform: uppercase;
}
.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}
.page-about .about-toc__item {
  flex-shrink: 0;
}
.page-about .about-toc__link {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--ab-c-line);
  color: var(--ab-c-ink);
  text-decoration: none;
  font-size: 0.8125rem;
  font-family: var(--font-data);
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-toc__link:hover {
  background: var(--ab-c-space);
  color: #ffffff;
  border-color: var(--ab-c-space);
}

/* 叙事正文 */
.page-about .about-content {
  display: flex;
  flex-direction: column;
  gap: var(--ab-section-gap);
  padding-bottom: 72px;
}
.page-about .about-section {
  position: relative;
  scroll-margin-top: 80px;
}
.page-about .about-section::before {
  content: attr(data-index);
  position: absolute;
  top: -12px;
  right: 0;
  font-family: var(--font-data);
  font-size: clamp(3.5rem, 12vw, 7rem);
  line-height: 1;
  color: var(--ab-num-low);
  pointer-events: none;
}
.page-about .about-section__title {
  margin: 0 0 16px;
  padding-right: 48px;
  font-family: var(--font-heading);
  font-size: var(--size-h2);
  line-height: 1.3;
}
.page-about .about-section__lead {
  margin: 0 0 20px;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--ab-c-ink);
  font-weight: 600;
  max-width: 40ch;
}
.page-about .about-section > p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: #3d4856;
  margin: 0 0 16px;
  max-width: 62ch;
}

/* 时间轴 */
.page-about .about-timeline {
  margin: 32px 0 24px;
  padding: 12px 0 12px 26px;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--ab-c-gold), var(--ab-c-orange));
  opacity: 0.6;
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 56px 16px 1fr;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 18px;
  cursor: default;
}
.page-about .about-timeline__year {
  font-family: var(--font-data);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--ab-c-space);
  text-align: right;
}
.page-about .about-timeline__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ab-c-offwhite);
  border: 2px solid var(--ab-c-gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.22);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.page-about .about-timeline__item:hover .about-timeline__dot {
  transform: scale(1.3);
  border-color: var(--ab-c-orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 44, 0.22);
}
.page-about .about-timeline__note {
  font-size: 0.875rem;
  line-height: 1.6;
  color: #3d4856;
  margin: 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-timeline__item:hover .about-timeline__note {
  color: var(--ab-c-space);
  border-bottom-color: var(--ab-c-orange);
}

/* 品牌缘起大图 */
.page-about .about-figure {
  margin: 28px 0 0;
}
.page-about .about-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-c-line);
}
.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  color: var(--ab-c-muted);
  font-family: var(--font-data);
}

/* 四库卡片 */
.page-about .about-archive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 28px 0 20px;
}
.page-about .about-archive-grid .card {
  background: #ffffff;
  border: 1px solid var(--ab-c-line);
  border-left: 3px solid var(--ab-c-gold);
  padding: 20px;
  margin: 0;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.page-about .about-archive-grid .card:hover {
  border-color: var(--ab-c-orange);
  border-left-color: var(--ab-c-orange);
  box-shadow: 0 10px 24px rgba(11, 27, 59, 0.08);
}
.page-about .about-archive-grid .card__meta {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--ab-c-muted);
  margin: 0 0 8px;
}
.page-about .about-archive-grid .card__title {
  margin: 0 0 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ab-c-space);
}
.page-about .about-archive-grid .card p:last-child {
  margin-bottom: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: #3d4856;
}
.page-about .about-archive-note {
  font-size: 0.8125rem;
  color: var(--ab-c-muted);
  border-top: 1px dashed var(--ab-c-line);
  padding-top: 14px;
  margin-bottom: 0;
}

/* 球队库规范 */
.page-about .about-teamlib {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}
.page-about .about-teamlib__text p {
  margin-bottom: 14px;
}
.page-about .about-teamlib__list {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  border-top: 1px solid var(--ab-c-line);
}
.page-about .about-teamlib__list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--ab-c-line);
  font-size: 0.875rem;
  color: #3d4856;
}
.page-about .about-teamlib__tag {
  flex-shrink: 0;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(11, 27, 59, 0.07);
  color: var(--ab-c-space);
  padding: 4px 8px;
}
.page-about .about-teamlib__figure {
  margin: 0;
}
.page-about .about-teamlib__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-c-line);
}
.page-about .about-teamlib__figure figcaption {
  margin-top: 8px;
  font-size: 0.8125rem;
  color: var(--ab-c-muted);
  font-family: var(--font-data);
}

/* 规则书版本化 */
.page-about .about-rules {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 24px;
}
.page-about .about-rules__text p {
  margin-bottom: 14px;
}
.page-about .about-rules__figure {
  margin: 0;
}
.page-about .about-rules__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ab-c-line);
}
.page-about .about-rules__figure figcaption {
  margin-top: 8px;
  font-size: 0.8125rem;
  color: var(--ab-c-muted);
  font-family: var(--font-data);
}
.page-about .note-card {
  background: #ffffff;
  border: 1px solid var(--ab-c-line);
  border-left: 4px solid var(--ab-c-gold);
  padding: 18px;
  margin: 16px 0 24px;
}
.page-about .note-card__title {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ab-c-space);
}
.page-about .note-card p:last-child {
  margin-bottom: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: #3d4856;
}

/* 更新与维护 */
.page-about .about-schedule {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 24px 0 20px;
}
.page-about .about-schedule__item {
  background: #ffffff;
  border: 1px solid var(--ab-c-line);
  padding: 20px;
  margin: 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.page-about .about-schedule__item:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(11, 27, 59, 0.09);
  border-color: var(--ab-c-orange);
}
.page-about .about-schedule__period {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--ab-c-orange);
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: 0.08em;
}
.page-about .about-schedule__title {
  margin: 0 0 8px;
  font-size: 1.125rem;
  color: var(--ab-c-space);
}
.page-about .about-schedule__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: #3d4856;
}
.page-about .about-schedule-note {
  font-size: 0.8125rem;
  color: var(--ab-c-muted);
  border-left: 3px solid var(--ab-c-orange);
  padding-left: 12px;
  margin-top: 8px;
}

/* 收束导读 */
.page-about .about-closing {
  margin-top: 24px;
  background-color: var(--ab-c-deep);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  border-top: 3px solid var(--ab-c-gold);
}
.page-about .about-closing__inner {
  padding: 40px 24px;
  max-width: var(--container-w);
  margin: 0 auto;
}
.page-about .about-closing__lead {
  margin: 0 0 24px;
  color: rgba(244, 246, 250, 0.85);
  font-size: 1rem;
  line-height: 1.85;
  max-width: 560px;
}
.page-about .about-closing__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .btn--outline {
  border-color: rgba(244, 246, 250, 0.5);
  color: #f4f6fa;
}
.page-about .btn--outline:hover {
  border-color: var(--ab-c-orange);
  color: var(--ab-c-orange);
  background: transparent;
}
.page-about .btn--primary {
  background: var(--ab-c-orange);
  border-color: var(--ab-c-orange);
  color: #ffffff;
}
.page-about .btn--primary:hover {
  background: #e85a1f;
  border-color: #e85a1f;
}

/* ===== 桌面端 ===== */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 56px 24px 80px;
  }
  .page-about .about-hero__body {
    grid-template-columns: 1fr 260px;
    padding: 48px 40px 56px;
  }
  .page-about .about-layout-wrap {
    padding: 0 24px;
  }
  .page-about .about-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }
  .page-about .about-toc {
    position: sticky;
    top: 24px;
    border: none;
    background: transparent;
    padding: 0;
  }
  .page-about .about-toc__label {
    border-left: 3px solid var(--ab-c-gold);
    padding-left: 10px;
    margin-bottom: 18px;
  }
  .page-about .about-toc__list {
    display: block;
    overflow: visible;
  }
  .page-about .about-toc__item {
    margin-bottom: 6px;
  }
  .page-about .about-toc__link {
    display: block;
    padding: 8px 12px;
    border: 1px solid transparent;
    border-left: 2px solid var(--ab-c-line);
    white-space: normal;
    font-size: 0.8125rem;
  }
  .page-about .about-toc__link:hover {
    background: rgba(11, 27, 59, 0.04);
    border-left-color: var(--ab-c-orange);
    color: var(--ab-c-space);
  }
  .page-about .about-content {
    gap: 96px;
    padding-bottom: 96px;
  }
  .page-about .about-archive-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .page-about .about-teamlib {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .page-about .about-rules {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 40px;
  }
  .page-about .about-schedule {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-closing__inner {
    padding: 56px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }
  .page-about .about-closing__lead {
    margin: 0;
  }
}