/* ===== 关于玩球 · 页面专属样式 ===== */
.page-about {
  --about-sidebar-w: 280px;
  --about-page-pad: clamp(20px, 3vw, 56px);
  background: var(--color-night-900);
  color: var(--color-white);
  min-height: 100vh;
  padding-top: calc(var(--header-height) + 16px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  position: relative;
  z-index: 2;
  padding: 20px 20px 0;
}

/* ---------- 分屏外壳 ---------- */
.page-about .about-shell {
  display: block;
  max-width: 1320px;
  margin-inline: auto;
}

/* ---------- 移动端章节索引 ---------- */
.page-about .about-index {
  margin-top: 14px;
  border-block: 1px solid rgba(255, 255, 255, 0.08);
  padding: 12px 16px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  background: linear-gradient(90deg, rgba(18, 38, 74, 0.95), rgba(10, 20, 40, 0.98));
}
.page-about .about-index::-webkit-scrollbar {
  display: none;
}
.page-about .about-index-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
  position: sticky;
  top: var(--header-height);
  z-index: 20;
}
.page-about .about-index-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  line-height: 1.7;
  color: var(--color-neon);
  white-space: nowrap;
}
.page-about .about-index-list {
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-index-item {
  margin: 0;
}
.page-about .about-index-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.82rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.25s ease, color 0.25s ease;
}
.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  background: rgba(57, 255, 20, 0.12);
  color: var(--color-white);
}
.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-neon);
}
.page-about .about-index-cta,
.page-about .about-index-note {
  display: none;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(3rem, 6vw, 5rem) var(--about-page-pad);
  overflow: hidden;
  border-bottom: 2px solid rgba(57, 255, 20, 0.5);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12vw;
  top: -10vw;
  width: 44vw;
  min-width: 280px;
  min-height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(57, 255, 20, 0.16) 0%, rgba(10, 20, 40, 0) 70%);
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "18";
  position: absolute;
  right: -2vw;
  bottom: -4vw;
  font-family: var(--font-head);
  font-size: clamp(10rem, 28vw, 19rem);
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  letter-spacing: -0.06em;
  pointer-events: none;
}
.page-about .about-hero-tag {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--color-neon);
}
.page-about .about-hero-tag::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-neon);
}
.page-about .about-hero h1 {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 3.25rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--color-white);
}
.page-about .about-hero-lead {
  position: relative;
  z-index: 1;
  max-width: 64ch;
  margin: 0 0 28px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 1rem;
  line-height: 1.85;
}
.page-about .about-hero-metrics {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 3vw, 2.5rem);
}
.page-about .about-hero-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 3px solid var(--color-neon);
}
.page-about .about-hero-num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 700;
  color: var(--color-white);
}
.page-about .about-hero-label {
  font-size: 0.82rem;
  color: var(--color-steel);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(3rem, 7vw, 6rem) var(--about-page-pad);
  overflow: hidden;
}
.page-about .about-section-head {
  max-width: 760px;
  margin-bottom: 32px;
}
.page-about .about-section-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.2vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--color-white);
}
.page-about .section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--color-neon);
}
.page-about .section-label::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-neon);
}

/* ---------- 深色章节 ---------- */
.page-about .about-section-night {
  background: var(--color-night-900);
  color: var(--color-white);
}
.page-about .about-section-night p {
  color: rgba(255, 255, 255, 0.76);
}

/* ---------- 浅色章节 ---------- */
.page-about .about-section-paper,
.page-about .about-section-light {
  background: var(--color-paper);
  color: var(--color-ink);
}
.page-about .about-section-paper .about-section-head h2,
.page-about .about-section-light .about-section-head h2 {
  color: var(--color-ink);
}
.page-about .about-section-paper .section-label,
.page-about .about-section-light .section-label {
  color: var(--color-orange);
}
.page-about .about-section-paper .section-label::before,
.page-about .about-section-light .section-label::before {
  background: var(--color-orange);
}
.page-about .about-section-paper p,
.page-about .about-section-light p {
  color: rgba(13, 17, 23, 0.76);
}

/* ---------- 01 为什么做 ---------- */
.page-about .about-story-layout {
  display: grid;
  gap: 28px;
}
.page-about .about-story-copy p {
  max-width: 64ch;
  margin: 0 0 16px;
  line-height: 1.9;
}
.page-about .about-story-copy strong {
  color: var(--color-white);
  font-weight: 600;
}
.page-about .about-story-aside {
  position: relative;
}
.page-about .about-story-card {
  position: relative;
  padding: 24px;
  transform: rotate(-0.6deg);
  background: linear-gradient(135deg, var(--color-night-700), #0e1d3c);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 3px solid var(--color-orange);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
}
.page-about .about-story-card-title {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--color-white);
}
.page-about .about-story-card p {
  margin: 0 0 16px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}
.page-about .about-story-card-tag {
  display: inline-block;
  margin: 4px 6px 0 0;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(57, 255, 20, 0.12);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-neon);
}

/* ---------- 02 2018 ---------- */
.page-about .about-start-grid {
  display: grid;
  gap: 32px;
}
.page-about .about-start-copy p {
  max-width: 64ch;
  margin: 0 0 16px;
  line-height: 1.9;
}
.page-about .about-start-copy strong {
  color: var(--color-ink);
  font-weight: 700;
}
.page-about .about-start-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.page-about .about-start-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 14px;
  background: var(--color-white);
  border-top: 3px solid var(--color-orange);
  box-shadow: 8px 8px 0 rgba(13, 17, 23, 0.06);
}
.page-about .about-start-fact-num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink);
}
.page-about .about-start-fact-label {
  font-size: 0.78rem;
  color: var(--color-steel);
}

/* ---------- 03 数据覆盖 ---------- */
.page-about .about-coverage-layout {
  display: grid;
  gap: 32px;
}
.page-about .about-coverage-copy p {
  max-width: 62ch;
  margin: 0 0 18px;
  line-height: 1.9;
}
.page-about .about-coverage-copy strong {
  color: var(--color-white);
}
.page-about .about-coverage-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  margin: 24px 0 0;
}
.page-about .about-coverage-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 4px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.82);
}
.page-about .about-coverage-item > span:last-child {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: right;
  color: var(--color-steel);
}
.page-about .about-coverage-line {
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
}
.page-about .about-coverage-figure {
  margin: 0;
}
.page-about .about-coverage-img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
  filter: saturate(0.9) contrast(1.05);
}
.page-about .about-coverage-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--color-steel);
}
.page-about .about-coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: linear-gradient(145deg, rgba(18, 38, 74, 0.9), rgba(10, 20, 40, 0.6));
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.page-about .about-stat:hover {
  transform: translateY(-4px);
  border-color: rgba(57, 255, 20, 0.4);
}
.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-neon);
}
.page-about .about-stat-label {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 04 版本演进 ---------- */
.page-about .about-section-light {
  background: linear-gradient(180deg, #f5efe6 0%, #efe2cc 100%);
}
.page-about .about-timeline {
  display: grid;
  gap: 32px;
}
.page-about .about-timeline-intro p {
  max-width: 46ch;
  line-height: 1.9;
}
.page-about .about-timeline-figure {
  margin: 20px 0 0;
}
.page-about .about-timeline-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 14px 34px rgba(13, 17, 23, 0.14);
}
.page-about .about-timeline-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-steel);
}
.page-about .about-timeline-list {
  display: grid;
  gap: 16px;
}
.page-about .about-timeline-item {
  position: relative;
  padding: 22px;
  background: var(--color-white);
  border-left: 3px solid var(--color-steel);
  box-shadow: 0 10px 22px rgba(13, 17, 23, 0.08);
  transform: rotate(-0.4deg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-about .about-timeline-item:hover {
  transform: rotate(-0.4deg) translateY(-4px);
  box-shadow: 0 18px 32px rgba(13, 17, 23, 0.16);
}
.page-about .about-timeline-year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-steel);
}
.page-about .about-timeline-version {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--font-head);
  font-size: 2rem;
  color: rgba(13, 17, 23, 0.12);
}
.page-about .about-timeline-item h3 {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: 1.15rem;
  color: var(--color-ink);
}
.page-about .about-timeline-item p {
  margin: 0 0 14px;
  font-size: 0.92rem;
  line-height: 1.7;
}
.page-about .about-timeline-v2 {
  border-left-color: var(--color-steel);
}
.page-about .about-timeline-v3 {
  border-left-color: var(--color-neon);
}
.page-about .about-timeline-v4 {
  border-left-color: var(--color-orange);
}

/* ---------- 05 团队与资质 ---------- */
.page-about .about-team-layout {
  display: grid;
  gap: 28px;
}
.page-about .about-team-copy p {
  max-width: 62ch;
  margin: 0 0 16px;
  line-height: 1.9;
}
.page-about .about-team-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}
.page-about .about-team-stat {
  flex: 1;
  min-width: 92px;
  padding: 16px 12px;
  background: var(--color-white);
  border-top: 3px solid var(--color-night-900);
  box-shadow: 0 6px 16px rgba(13, 17, 23, 0.08);
}
.page-about .about-team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-ink);
}
.page-about .about-team-stat span:last-child {
  font-size: 0.8rem;
  color: var(--color-steel);
}
.page-about .about-team-figure {
  margin: 0;
}
.page-about .about-team-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  filter: brightness(0.98);
}
.page-about .about-team-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-steel);
}
.page-about .about-certifications {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}
.page-about .about-cert-item {
  padding: 20px;
  background: var(--color-white);
  border-left: 4px solid var(--color-orange);
  box-shadow: 0 8px 20px rgba(13, 17, 23, 0.06);
}
.page-about .about-cert-title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--color-ink);
}
.page-about .about-cert-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-closing {
  background: linear-gradient(120deg, var(--color-night-900) 0%, #0d1f45 60%, var(--color-night-700) 100%);
  text-align: center;
  padding: clamp(4rem, 8vw, 6rem) var(--about-page-pad);
}
.page-about .about-closing h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  color: var(--color-white);
}
.page-about .about-closing p {
  max-width: 58ch;
  margin: 0 auto 28px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
}
.page-about .about-closing-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

/* ---------- 桌面分屏：左侧固定章节索引 ---------- */
@media (min-width: 1024px) {
  .page-about {
    padding-top: var(--header-height);
  }

  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-sidebar-w) minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .about-index {
    margin-top: 0;
    border: 0;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
    padding: 0;
    background: transparent;
    overflow: visible;
    min-width: 0;
  }

  .page-about .about-index-inner {
    position: sticky;
    top: calc(var(--header-height) + 16px);
    z-index: 5;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    padding: 32px 28px 32px 0;
    min-width: 0;
  }

  .page-about .about-index-label {
    width: 100%;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
    font-size: 0.75rem;
    color: var(--color-steel);
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 2px;
    width: 100%;
  }

  .page-about .about-index-link {
    justify-content: flex-start;
    padding: 10px 12px;
    border-radius: 8px;
    border-left: 2px solid transparent;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.66);
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    border-left-color: var(--color-neon);
    background: linear-gradient(90deg, rgba(57, 255, 20, 0.1), rgba(57, 255, 20, 0.02));
    color: var(--color-white);
  }

  .page-about .about-index-cta {
    display: inline-flex;
    width: 100%;
    margin-top: 22px;
    justify-content: center;
  }

  .page-about .about-index-note {
    display: block;
    margin: -4px 0 0;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    line-height: 1.7;
    color: var(--color-steel);
  }

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

  .page-about .about-hero {
    padding-top: clamp(4rem, 8vw, 6rem);
    padding-bottom: clamp(4rem, 8vw, 6rem);
  }

  .page-about .about-story-layout {
    grid-template-columns: 1.4fr 0.6fr;
    gap: 48px;
  }

  .page-about .about-start-grid {
    grid-template-columns: 1.3fr 0.7fr;
    gap: 48px;
  }

  .page-about .about-coverage-layout {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about .about-coverage-list {
    grid-template-columns: 1fr;
  }

  .page-about .about-coverage-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 40px;
  }

  .page-about .about-timeline {
    grid-template-columns: minmax(240px, 320px) 1fr;
    gap: 48px;
  }

  .page-about .about-timeline-list {
    gap: 18px;
  }

  .page-about .about-team-layout {
    grid-template-columns: 1fr 0.9fr;
    gap: 48px;
  }

  .page-about .about-certifications {
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }
}

/* ---------- 中屏微调 ---------- */
@media (min-width: 960px) and (max-width: 1023px) {
  .page-about .about-coverage-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-coverage-layout {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .page-about .about-start-grid,
  .page-about .about-team-layout {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
  }

  .page-about .about-timeline {
    grid-template-columns: 1fr;
  }
}