/* ============ 品牌故事页 · 页面专属样式 ============ */
.page-about {
  position: relative;
  overflow-x: hidden;
  --ab-hero-title: clamp(2.5rem, 7vw, 6rem);
  --ab-num-big: clamp(3rem, 9vw, 7rem);
  --ab-section-num: clamp(6rem, 20vw, 16rem);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏叙事 ---------- */
.page-about .ab-hero {
  padding: 6rem 0 3.5rem;
  border-bottom: 2px solid var(--line);
}

.page-about .ab-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-size: var(--ab-hero-title);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin: 1.2rem 0 1rem;
}

.page-about .ab-hero .lead {
  font-size: 1.15rem;
  color: var(--paper);
  max-width: 34em;
  margin-bottom: 1.25rem;
}

.page-about .ab-hero-copy > p:not(.lead):not(.section-eyebrow) {
  color: var(--muted);
  max-width: 36em;
  margin-bottom: 1.4rem;
  line-height: 1.75;
}

.page-about .ab-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .ab-hero-visual {
  border: 2px solid var(--line);
  box-shadow: 10px 10px 0 rgba(230, 57, 70, 0.35), var(--shadow);
  transform: rotate(1deg);
  overflow: hidden;
}

.page-about .ab-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---------- 章节水印与层级 ---------- */
.page-about .section {
  position: relative;
  z-index: 0;
}

.page-about .section-header {
  margin-bottom: 2rem;
}

.page-about .ab-section-num {
  position: absolute;
  top: 0.4rem;
  right: 0.6rem;
  z-index: -1;
  font-family: var(--font-data);
  font-size: var(--ab-section-num);
  font-weight: 900;
  line-height: 1;
  color: rgba(241, 245, 249, 0.045);
  pointer-events: none;
  user-select: none;
}

.page-about .section-header,
.page-about .ab-timeline-wrap,
.page-about .ab-league-grid,
.page-about .ab-quality-wrap,
.page-about .ab-license-grid,
.page-about .ab-contact-grid,
.page-about .ab-cta-links {
  position: relative;
  z-index: 1;
}

/* ---------- 品牌哲学 ---------- */
.page-about .ab-philosophy-lead {
  font-size: 1.35rem;
  line-height: 1.8;
  color: var(--paper);
  border-left: 4px solid var(--red);
  padding-left: 1.25em;
  margin: 0 0 2.5rem;
  max-width: 46em;
}

.page-about .ab-value-card {
  position: relative;
  padding: 2rem 1.4rem 1.8rem;
  border: 2px solid var(--line);
  background: var(--red-soft);
  box-shadow: var(--shadow);
}

.page-about .ab-value-card:nth-child(even) {
  transform: translateY(8px);
}

@media (hover: hover) {
  .page-about .ab-value-card:hover {
    border-color: var(--lime);
    background: var(--lime-soft);
  }
}

.page-about .ab-value-num {
  font-family: var(--font-data);
  font-size: 0.95rem;
  color: var(--red);
  letter-spacing: 0.12em;
}

.page-about .ab-value-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.3;
  margin: 0.85rem 0 0.6rem;
}

.page-about .ab-value-card p {
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.95rem;
  margin: 0;
}

/* ---------- 垂直时间线 ---------- */
.page-about .ab-timeline-wrap {
  margin-top: 3rem;
  position: relative;
}

.page-about .ab-timeline-svg {
  position: absolute;
  left: 11px;
  top: 0.7rem;
  width: 2px;
  height: calc(100% - 1rem);
  z-index: 0;
  pointer-events: none;
}

.page-about .ab-timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 1.5rem auto 1fr;
  column-gap: 0.75rem;
  row-gap: 0.5rem;
  padding-bottom: 2.5rem;
}

.page-about .ab-timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .ab-timeline-marker {
  padding-top: 0.4rem;
}

.page-about .ab-timeline-dot {
  position: relative;
  z-index: 1;
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--ink-deep);
  border: 3px solid var(--red);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .ab-timeline-date {
  text-align: left;
  line-height: 1.2;
  min-width: 4ch;
}

.page-about .ab-timeline-year {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-timeline-version {
  display: inline-block;
  margin-top: 0.4rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--lime);
  border: 1px solid var(--lime);
  padding: 0.25em 0.7em;
}

.page-about .ab-timeline-body {
  min-width: 0;
}

.page-about .ab-timeline-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.55rem;
}

.page-about .ab-timeline-body p {
  color: var(--muted);
  line-height: 1.75;
  font-size: 0.95rem;
  margin: 0;
}

.page-about .ab-timeline-stat {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.9rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--lime);
  background: var(--lime-soft);
  font-size: 0.85rem;
  color: var(--paper);
}

/* ---------- 数据体系：处理链路 ---------- */
.page-about .ab-flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-flow-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 2px solid var(--line);
  align-items: start;
}

.page-about .ab-flow-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--red);
  background: var(--red-soft);
  border: 1px solid rgba(230, 57, 70, 0.5);
}

.page-about .ab-flow-list strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.page-about .ab-flow-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.95rem;
}

/* ---------- 赛道与地图 ---------- */
.page-about .ab-league-section {
  margin-top: 3.5rem;
  border-top: 2px solid var(--line);
  padding-top: 2.5rem;
}

.page-about .ab-league-section h3 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
}

.page-about .ab-league-copy {
  color: var(--muted);
  max-width: 42em;
  margin-bottom: 1.6rem;
  line-height: 1.75;
}

.page-about .ab-league-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}

.page-about .ab-map-frame {
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
}

.page-about .ab-map-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

/* ---------- 标签页：联赛覆盖 ---------- */
.page-about .tabs {
  border: 2px solid var(--line);
  background: rgba(11, 20, 32, 0.6);
}

.page-about .tab-list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--line);
}

.page-about .tab {
  flex: 0 0 auto;
  appearance: none;
  background: transparent;
  border: 0;
  border-right: 2px solid var(--line);
  padding: 0.8rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s, background 0.2s, box-shadow 0.2s;
}

.page-about .tab:last-child {
  border-right: 0;
}

.page-about .tab[aria-selected="true"] {
  background: var(--lime-soft);
  color: var(--lime);
  box-shadow: inset 0 3px 0 var(--lime);
}

.page-about .tab-panel {
  display: none;
  padding: 1.25rem 1.3rem 1.5rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .tab-panel[aria-hidden="false"] {
  display: block;
}

/* ---------- 数据质量 ---------- */
.page-about .ab-quality-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 1rem;
  padding: 2rem;
  border: 2px solid var(--line);
  background: var(--red-soft);
  box-shadow: var(--shadow);
}

.page-about .ab-quality-copy h3 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
}

.page-about .ab-quality-copy p {
  color: var(--muted);
  line-height: 1.75;
  max-width: 38em;
}

.page-about .ab-quality-copy .muted-text {
  margin-top: 0.75rem;
}

.page-about .ab-quality-visual img {
  width: 100%;
  height: auto;
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-quality-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.page-about .ab-quality-stat {
  flex: 1 1 140px;
  border: 2px solid var(--line);
  background: var(--ink-deep);
  padding: 1.2rem 1rem;
  text-align: center;
}

.page-about .ab-big-num {
  display: block;
  font-family: var(--font-data);
  font-size: var(--ab-num-big);
  font-weight: 900;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-big-label {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

/* ---------- 资质与服务 ---------- */
.page-about .ab-license-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-block: 2rem;
}

.page-about .ab-license-grid .data-card {
  border: 2px solid var(--line);
  background: var(--red-soft);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.page-about .ab-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}

.page-about .ab-contact-block {
  border: 2px solid var(--line);
  padding: 1.5rem;
  background: var(--ink-deep);
}

.page-about .ab-contact-block h3 {
  font-size: 1.05rem;
  margin: 0 0 0.75rem;
  color: var(--lime);
}

.page-about .ab-contact-block p {
  margin: 0.25rem 0;
  color: var(--paper);
  word-break: break-all;
}

.page-about .ab-contact-block .muted-text {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  line-height: 1.6;
}

.page-about .ab-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .ab-trust-text {
  margin-top: 1.75rem;
  max-width: 40em;
  line-height: 1.75;
}

/* ---------- 桌面端适配 ---------- */
@media (min-width: 700px) {
  .page-about .ab-license-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .ab-contact-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .ab-quality-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding: 7rem 0 4.5rem;
  }

  .page-about .ab-hero-inner {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3.5rem;
    align-items: center;
  }

  .page-about .ab-value-card {
    padding: 2.4rem 1.8rem 2rem;
  }

  .page-about .ab-timeline-item {
    padding-bottom: 3.5rem;
  }

  .page-about .ab-league-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .page-about .ab-quality-wrap {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    padding: 2.5rem;
  }

  .page-about .ab-quality-visual {
    grid-column: 2;
  }

  .page-about .ab-quality-stats {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .ab-flow-list {
    max-width: 48em;
  }
}