.page-about {
  --about-gap: clamp(28px, 5vw, 64px);
  --about-ink-soft: rgba(10, 12, 18, 0.76);
  --about-ink-faint: rgba(10, 12, 18, 0.58);
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(148deg, var(--night) 0%, var(--navy) 62%, #0d2242 100%);
  color: var(--paper);
  padding: clamp(34px, 6vw, 76px) 0 clamp(38px, 6vw, 80px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(201, 206, 216, 0.07) 0 1px,
    transparent 1px 34px
  );
  pointer-events: none;
}

.page-about .about-hero-mark {
  position: absolute;
  z-index: 0;
  right: -14%;
  bottom: -46%;
  width: min(560px, 70vw);
  aspect-ratio: 1 / 1;
  border-radius: 46% 54% 62% 38% / 52% 42% 58% 48%;
  background: radial-gradient(circle at 34% 34%, rgba(255, 107, 26, 0.92), rgba(255, 107, 26, 0) 66%);
  pointer-events: none;
}

.page-about .about-hero-frame {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .section-label {
  color: var(--lime);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 5.6vw, 4.1rem);
  line-height: 1.07;
  letter-spacing: -0.02em;
  margin: 12px 0 20px;
  max-width: 20ch;
}

.page-about .about-hero-lead {
  max-width: 62ch;
  font-size: clamp(0.97rem, 1.3vw, 1.1rem);
  line-height: 1.9;
  color: rgba(245, 246, 248, 0.82);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid rgba(201, 206, 216, 0.24);
  border-radius: var(--radius);
  background: rgba(201, 206, 216, 0.24);
  overflow: hidden;
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 18px;
  background: rgba(10, 12, 18, 0.62);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .stat-label {
  font-size: 0.8rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: rgba(245, 246, 248, 0.66);
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(36px, 5vw, 66px);
  padding-bottom: clamp(44px, 6vw, 90px);
}

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

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  align-self: start;
}

.page-about .chapter-toc-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-ink-faint);
  margin: 0 0 12px;
}

.page-about .about-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 12px;
}

.page-about .about-toc .chapter-link {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 2px solid var(--line);
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--about-ink-faint);
  text-decoration: none;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-toc .chapter-link:hover {
  color: var(--ink);
  border-left-color: var(--blue);
}

.page-about .about-toc .chapter-link.is-active {
  color: var(--ink);
  font-weight: 600;
  border-left-color: var(--orange);
  background: linear-gradient(90deg, rgba(255, 107, 26, 0.12), rgba(255, 107, 26, 0));
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--line);
  padding-top: clamp(34px, 5vw, 56px);
  margin-top: clamp(34px, 5vw, 56px);
}

.page-about .about-articles > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.28rem);
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 10px 0 16px;
  max-width: 24ch;
}

.page-about .about-section h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
  margin: 0 0 6px;
}

.page-about .about-section p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--about-ink-soft);
  max-width: 66ch;
  margin: 0 0 14px;
}

.page-about .about-lede {
  font-size: clamp(1.01rem, 1.4vw, 1.12rem);
  color: var(--ink);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 16px 0 16px 22px;
  border-left: 2px solid var(--line-strong);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 22px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--orange);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .timeline-body p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
}

/* ---------- 团队与节奏 ---------- */
.page-about .about-media-row {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: 26px;
}

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

.page-about .about-rhythm {
  background: var(--mist);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-rhythm h3 {
  margin-bottom: 16px;
}

.page-about .about-rhythm ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .about-rhythm li {
  display: grid;
  grid-template-columns: auto auto;
  justify-content: start;
  align-items: baseline;
  gap: 4px 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .rhythm-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--navy);
}

.page-about .rhythm-unit {
  font-size: 0.82rem;
  color: var(--about-ink-faint);
}

.page-about .about-section .about-rhythm li p {
  grid-column: 1 / -1;
  margin: 5px 0 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-ink-soft);
  max-width: none;
}

/* ---------- 覆盖版图 ---------- */
.page-about .about-coverage-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: 26px;
}

.page-about .about-leagues {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .league-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .league-item:first-child {
  border-top: 1px dashed var(--line-strong);
}

.page-about .league-idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--blue);
  padding-top: 3px;
}

.page-about .league-name {
  font-size: 1rem;
  font-weight: 700;
}

.page-about .league-note {
  grid-column: 2;
  font-size: 0.86rem;
  line-height: 1.68;
  color: var(--about-ink-faint);
}

/* ---------- 协作网络 ---------- */
.page-about .about-partner-band {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .partner-stat {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  background: var(--mist);
}

.page-about .partner-stat::after {
  content: "";
  position: absolute;
  right: -42px;
  bottom: -62px;
  width: 168px;
  height: 168px;
  border-radius: 48% 52% 60% 40% / 55% 45% 55% 45%;
  background: rgba(19, 59, 107, 0.1);
  pointer-events: none;
}

.page-about .partner-stat--accent {
  background: var(--navy);
  color: var(--paper);
}

.page-about .partner-stat--accent::after {
  background: rgba(255, 107, 26, 0.3);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .partner-stat--accent .partner-num {
  color: var(--lime);
}

.page-about .about-section .partner-stat p {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.82;
  max-width: 34ch;
}

.page-about .partner-stat--accent p {
  color: rgba(245, 246, 248, 0.82);
}

/* ---------- 服务节奏 ---------- */
.page-about .about-scale-grid {
  display: grid;
  gap: 1px;
  margin: 24px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .scale-item {
  background: var(--paper);
  padding: 20px 18px;
}

.page-about .scale-item dt {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 1.95rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .scale-item dt em {
  font-style: normal;
  font-size: 0.6em;
  color: var(--blue);
  margin-left: 3px;
}

.page-about .scale-item dd {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--about-ink-faint);
}

/* ---------- 新赛季 ---------- */
.page-about .about-next-grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(20px, 3vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #ffffff;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .next-card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-card);
}

.page-about .about-section .next-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.page-about .about-section .next-card p {
  margin: 0 0 4px;
  font-size: 0.9rem;
  line-height: 1.76;
  max-width: none;
}

.page-about .next-card--accent {
  background: var(--night);
  border-color: var(--night);
}

.page-about .next-card--accent h3 {
  color: #ffffff;
}

.page-about .next-card--accent p {
  color: rgba(245, 246, 248, 0.74);
}

.page-about .about-link {
  margin-top: auto;
  align-self: flex-start;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 26, 0.42);
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-link:hover {
  color: var(--orange-soft);
  border-bottom-color: var(--orange-soft);
}

.page-about .next-card--accent .about-link {
  color: var(--lime);
  border-bottom-color: rgba(198, 255, 46, 0.42);
}

.page-about .next-card--accent .about-link:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* ---------- 城市主题带 ---------- */
.page-about .about-city {
  position: relative;
  display: grid;
  min-height: 300px;
  margin-top: clamp(38px, 6vw, 76px);
  margin-bottom: clamp(44px, 6vw, 84px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-city img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.44;
}

.page-about .about-city-body {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 10px;
  padding: clamp(28px, 5vw, 58px) clamp(22px, 4vw, 48px);
  background: linear-gradient(90deg, rgba(10, 12, 18, 0.88), rgba(10, 12, 18, 0.24));
}

.page-about .about-city-body .section-label {
  color: var(--lime);
}

.page-about .about-city-body p {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(0.96rem, 1.3vw, 1.1rem);
  line-height: 1.86;
  color: rgba(245, 246, 248, 0.86);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-scale-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline-item {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .about-partner-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 800px) {
  .page-about .about-media-row {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-city-body {
    max-width: 64%;
  }
}

@media (min-width: 860px) {
  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }

  .page-about .about-toc ul {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

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

@media (min-width: 1180px) {
  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
  }
}