.page-about {
  --ab-line: #24425E;
  --ab-gap-lg: clamp(2.5rem, 7vw, 5rem);
  --ab-gap-md: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(1.75rem, 5vw, 3rem) clamp(2.5rem, 7vw, 5rem);
}

.page-about .ab-hero-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

.page-about .ab-hero-copy h1 {
  margin: 0.6rem 0 1.1rem;
  font-family: var(--f-sans);
  font-weight: 900;
  font-size: clamp(1.95rem, 6.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .ab-hero-copy .lede {
  margin: 0 0 1rem;
  max-width: 46ch;
}

.page-about .ab-hero-note {
  margin: 0 0 1.75rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--c-cyan);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-steel);
  letter-spacing: 0.01em;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .ab-hero-media {
  margin: 0;
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 通用区块 ---------- */
.page-about .ab-sec {
  padding-block: var(--ab-gap-lg);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-sec .section-title {
  max-width: 22ch;
}

.page-about .ab-copy {
  max-width: 58ch;
  margin: 0 0 var(--ab-gap-md);
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--c-steel);
}

.page-about .ab-sec .section-head {
  margin-bottom: var(--ab-gap-md);
}

/* ---------- 01 赛季档案 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: var(--ab-gap-lg);
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.15rem 1.1rem;
  background: var(--c-navy-2);
}

.page-about .ab-stat-num {
  font-size: clamp(2rem, 7vw, 3.25rem);
  line-height: 1;
  font-weight: 700;
  color: var(--c-cyan);
}

.page-about .ab-stat-label {
  font-size: var(--fs-14);
  color: var(--c-steel);
  line-height: 1.5;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 1px solid var(--ab-line);
}

.page-about .ab-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem 1.1rem;
  padding: 1.35rem 0 1.35rem 1.25rem;
  border-bottom: 1px dashed rgba(36, 66, 94, 0.6);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-tl-item:last-child {
  border-bottom: 0;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 1.85rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-navy);
  border: 1px solid var(--c-cyan);
}

.page-about .ab-tl-item:hover::before {
  background: var(--c-cyan);
}

.page-about .ab-tl-idx {
  font-size: var(--fs-20);
  color: var(--c-cyan-soft);
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.page-about .ab-tl-body h3 {
  margin: 0 0 0.4rem;
  font-family: var(--f-sans);
  font-size: var(--fs-20);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .ab-tl-body p {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-steel);
}

/* ---------- 02 团队 ---------- */
.page-about .ab-roles {
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-role {
  display: flex;
  flex-direction: column;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--c-navy-2);
  box-shadow: var(--shadow-card);
  outline: none;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-visible {
  background: var(--c-board);
  transform: translateY(-2px);
}

.page-about .ab-role-num {
  font-size: clamp(2.25rem, 6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
  margin-bottom: 0.9rem;
}

.page-about .ab-role h3 {
  margin: 0 0 0.6rem;
  font-family: var(--f-sans);
  font-size: var(--fs-20);
  font-weight: 900;
  color: var(--c-paper);
  letter-spacing: -0.01em;
}

.page-about .ab-role p {
  margin: 0 0 1rem;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .ab-role-fields {
  margin-top: auto;
  padding-top: 0.8rem;
  border-top: 1px solid var(--ab-line);
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--c-steel);
  opacity: 0.72;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-role:hover .ab-role-fields,
.page-about .ab-role:focus-visible .ab-role-fields {
  opacity: 1;
  color: var(--c-cyan-soft);
}

/* ---------- 03 发布流程 ---------- */
.page-about .ab-flow {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background: var(--c-navy-2);
  box-shadow: var(--shadow-card);
  padding: clamp(1.25rem, 4vw, 2.25rem);
}

.page-about .ab-flow-bg {
  position: absolute;
  inset: 0;
  margin: 0;
  border: 0;
  opacity: 0.24;
  z-index: 0;
  pointer-events: none;
}

.page-about .ab-flow-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-flow-list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(36, 66, 94, 0.7);
  border: 1px solid rgba(36, 66, 94, 0.7);
}

.page-about .ab-step details {
  background: rgba(8, 25, 43, 0.86);
}

.page-about .ab-step summary {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 1.1rem clamp(1rem, 3vw, 1.4rem);
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-step summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-step summary:hover {
  background: rgba(31, 227, 208, 0.06);
}

.page-about .ab-step summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: var(--fs-16);
  color: var(--c-cyan-soft);
  line-height: 1;
  transition: transform var(--dur) var(--ease);
}

.page-about .ab-step details[open] summary::after {
  content: "－";
}

.page-about .ab-step-num {
  font-size: var(--fs-20);
  color: var(--c-cyan);
  line-height: 1.2;
}

.page-about .ab-step-name {
  font-family: var(--f-sans);
  font-size: var(--fs-20);
  font-weight: 900;
  color: var(--c-paper);
  letter-spacing: 0.02em;
}

.page-about .ab-step p {
  margin: 0;
  padding: 0 clamp(1rem, 3vw, 1.4rem) 1.35rem;
  max-width: 68ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-steel);
}

/* ---------- 04 服务对象 ---------- */
.page-about .serif-lead {
  max-width: 54ch;
  margin: 0 0 var(--ab-gap-md);
  font-family: var(--f-serif);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  line-height: 1.75;
  color: var(--c-paper);
}

.page-about .ab-aud-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-aud-list li {
  padding: clamp(1.15rem, 3vw, 1.6rem);
  background: var(--c-navy);
  border-left: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-aud-list li:hover {
  border-left-color: var(--c-cyan);
  background: var(--c-navy-2);
}

.page-about .ab-aud-list h3 {
  margin: 0 0 0.5rem;
  font-family: var(--f-sans);
  font-size: var(--fs-16);
  font-weight: 900;
  color: var(--c-paper);
  letter-spacing: 0.01em;
}

.page-about .ab-aud-list p {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--c-steel);
}

/* ---------- 05 引用合作 ---------- */
.page-about .ab-cite-grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

.page-about .ab-cite-figures {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.25rem, 4vw, 2.5rem);
  margin: 0 0 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-cite-figure {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .ab-cite-num {
  font-size: clamp(2.25rem, 8vw, 3.5rem);
  line-height: 1;
  font-weight: 700;
  color: var(--c-gold);
}

.page-about .ab-cite-label {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--c-steel);
  max-width: 22ch;
}

.page-about .ab-cite-media {
  margin: 0;
}

.page-about .ab-cite-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 06 纠错通道 ---------- */
.page-about .ab-fix {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .ab-fix-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .ab-fix-steps li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px dashed rgba(36, 66, 94, 0.6);
  font-size: var(--fs-14);
  color: var(--c-paper);
}

.page-about .ab-fix-steps .num {
  flex: none;
  width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--c-cyan);
  border-radius: 50%;
  font-size: var(--fs-12);
  color: var(--c-cyan);
  line-height: 1;
}

.page-about .ab-fix-contacts {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--c-board);
  border: 1px solid var(--ab-line);
  box-shadow: var(--shadow-card);
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .ab-fix-contacts .contact-item {
  display: grid;
  gap: 0.25rem;
}

.page-about .ab-fix-contacts .contact-label {
  font-family: var(--f-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--c-steel);
}

.page-about .ab-fix-contacts .contact-value {
  font-family: var(--f-mono);
  font-size: var(--fs-16);
  color: var(--c-cyan-soft);
  word-break: break-all;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about a.contact-value:hover {
  border-bottom-color: var(--c-cyan);
}

.page-about .ab-fix-contacts .contact-note {
  margin: 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--ab-line);
  font-size: var(--fs-12);
  line-height: 1.75;
  color: var(--c-steel);
}

/* ---------- CTA 数据带 ---------- */
.page-about .ab-cta {
  margin-top: var(--ab-gap-lg);
}

.page-about .ab-cta-inner {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

.page-about .ab-cta-title {
  margin: 0.55rem 0 0;
  font-family: var(--f-sans);
  font-size: clamp(1.35rem, 4vw, 2.1rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--c-paper);
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

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

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

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(2.5rem, 6vw, 4.5rem);
  }

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

  .page-about .ab-step details {
    height: 100%;
  }

  .page-about .ab-cite-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }

  .page-about .ab-fix {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
  }

  .page-about .ab-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2.5rem;
  }

  .page-about .ab-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero-copy h1 {
    letter-spacing: -0.03em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-role-fields,
  .page-about .ab-aud-list li,
  .page-about .ab-step summary::after,
  .page-about .ab-tl-item {
    transition: none;
  }

  .page-about .ab-role:hover,
  .page-about .ab-role:focus-visible {
    transform: none;
  }
}