.page-about {
  --ab-soft: rgba(244, 233, 216, .7);
  --ab-line: rgba(244, 233, 216, .14);
  --ab-sec-pad: clamp(40px, 6.5vw, 76px);
  background: var(--royal);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  margin: 0;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 40px) 0 clamp(40px, 6vw, 78px);
  background:
    radial-gradient(120% 78% at 84% 4%, rgba(247, 201, 72, .16), transparent 62%),
    radial-gradient(92% 64% at 6% 98%, rgba(63, 198, 255, .13), transparent 64%),
    linear-gradient(180deg, var(--royal) 0%, var(--ink) 100%);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 48px);
  margin-top: clamp(26px, 5vw, 52px);
}

.page-about .hero-copy h1 {
  font-size: clamp(31px, 7.4vw, 64px);
  line-height: 1.06;
  margin-top: 14px;
}

.page-about .hero-copy .lede {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--ab-soft);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hero-art {
  max-width: 380px;
  width: 100%;
  margin: 0 auto;
}

.page-about .hero-art svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 58px) 0 0;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .hero-stat {
  background: rgba(10, 7, 16, .78);
  padding: 16px 18px;
}

.page-about .hero-stat dt {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .hero-stat dd {
  margin: 6px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.1;
  color: var(--gold);
}

/* ---------- 主栅格 + 右侧粘性目录 ---------- */
.page-about .about-layout {
  display: block;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-main > .about-section {
  padding: var(--ab-sec-pad) 0;
  scroll-margin-top: 96px;
}

.page-about .about-main > .about-section + .about-section {
  border-top: 1px solid var(--ab-line);
}

.page-about .about-anchors {
  display: none;
}

/* ---------- 起步 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .origin-text p {
  margin: 0 0 18px;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .origin-text p:last-child {
  margin-bottom: 0;
}

.page-about .origin-figure {
  margin: 0;
}

/* ---------- 三条内容线 ---------- */
.page-about .line-cards {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about .line-card {
  position: relative;
  padding: 26px 20px 20px;
  background: var(--royal-2);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
}

.page-about .line-card--report::before { background: var(--gold); }
.page-about .line-card--video::before { background: var(--neon); }
.page-about .line-card--search::before { background: var(--wood); }

.page-about .line-card h3 {
  margin: 14px 0 10px;
  font-size: 19px;
  line-height: 1.3;
}

.page-about .line-card p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-soft);
}

.page-about .line-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 198, 255, .45);
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .line-link:hover,
.page-about .line-link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ---------- 赛季节拍 ---------- */
.page-about .about-season {
  position: relative;
  isolation: isolate;
}

.page-about .season-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  border-radius: var(--r-lg);
  opacity: .16;
}

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

.page-about .season-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 76vw);
  gap: 18px;
  margin-top: 32px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 16px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--gold) transparent;
}

.page-about .season-track > * {
  scroll-snap-align: start;
}

.page-about .season-track::-webkit-scrollbar {
  height: 4px;
}

.page-about .season-track::-webkit-scrollbar-thumb {
  background: var(--gold);
  border-radius: var(--r-pill);
}

.page-about .season-node {
  position: relative;
  padding: 22px 18px 22px;
  background: linear-gradient(180deg, rgba(74, 20, 112, .78), rgba(10, 7, 16, .72));
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .season-node:hover,
.page-about .season-node:focus-within {
  border-color: rgba(247, 201, 72, .55);
  transform: translateY(-4px);
}

.page-about .season-dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 5px rgba(247, 201, 72, .16);
  margin-bottom: 16px;
}

.page-about .season-phase {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
}

.page-about .season-node h3 {
  margin: 8px 0 10px;
  font-size: 18px;
  line-height: 1.32;
}

.page-about .season-node p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ab-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-figure {
  margin: 28px 0 0;
}

.page-about .team-grid {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .team-chart {
  margin: 0;
}

.page-about .team-chart svg {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
}

.page-about .team-slice {
  stroke: var(--ink);
  stroke-width: 2;
  transform-box: view-box;
  transform-origin: 120px 120px;
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.page-about .team-slice:hover {
  transform: scale(1.05);
}

.page-about .team-slice--edit { fill: var(--gold); }
.page-about .team-slice--video { fill: var(--neon); }
.page-about .team-slice--data { fill: var(--wood); }
.page-about .team-slice--design { fill: #B48BD6; }
.page-about .team-slice--cs { fill: var(--gold-soft); }

.page-about .team-chart-hub {
  fill: var(--ink);
}

.page-about .team-chart-num {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  fill: var(--gold);
}

.page-about .team-chart-label {
  font-family: var(--font-body);
  font-size: 13px;
  fill: var(--muted);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 16px;
  background: rgba(74, 20, 112, .34);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--wood);
  border-radius: var(--r-md);
  transition: background .22s var(--ease);
}

.page-about .team-item:hover {
  background: rgba(74, 20, 112, .62);
}

.page-about .team-item--edit { border-left-color: var(--gold); }
.page-about .team-item--video { border-left-color: var(--neon); }
.page-about .team-item--data { border-left-color: var(--wood); }
.page-about .team-item--design { border-left-color: #B48BD6; }
.page-about .team-item--cs { border-left-color: var(--gold-soft); }

.page-about .team-count {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  padding-top: 2px;
}

.page-about .team-item h3 {
  margin: 0 0 5px;
  font-size: 15px;
}

.page-about .team-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--ab-soft);
}

/* ---------- 栏目沿革阶梯 ---------- */
.page-about .ladder {
  margin-top: 32px;
  display: grid;
  gap: 12px;
}

.page-about .ladder-item {
  margin-left: calc(var(--step, 0) * min(26px, 4vw));
}

.page-about .ladder-head {
  margin: 0;
  font-size: inherit;
  font-weight: 400;
}

.page-about .ladder-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 16px;
  background: rgba(74, 20, 112, .42);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
  text-align: left;
  cursor: pointer;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ladder-trigger:hover,
.page-about .ladder-trigger:focus-visible {
  background: rgba(74, 20, 112, .72);
  border-color: rgba(247, 201, 72, .5);
}

.page-about .ladder-year {
  flex: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .ladder-label {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .ladder-mark {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--neon);
  border-bottom: 2px solid var(--neon);
  transform: rotate(45deg);
  transition: transform .22s var(--ease);
}

.page-about .ladder-trigger[aria-expanded="true"] .ladder-mark {
  transform: rotate(-135deg);
}

.page-about .ladder-panel {
  padding: 14px 16px 4px;
  border-left: 2px solid rgba(247, 201, 72, .38);
  margin: 8px 0 0 14px;
}

.page-about .ladder-panel p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ab-soft);
  max-width: 62ch;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .partner-card {
  padding: 22px 20px;
  background: linear-gradient(150deg, rgba(183, 122, 60, .22), rgba(10, 7, 16, .55));
  border: 1px solid rgba(183, 122, 60, .35);
  border-radius: var(--r-md);
}

.page-about .partner-num {
  margin: 0;
  font-size: clamp(40px, 9vw, 58px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .partner-card h3 {
  margin: 12px 0 8px;
  font-size: 17px;
}

.page-about .partner-card p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ab-soft);
}

.page-about .partner-foot {
  margin: 26px 0 0;
  font-size: 14px;
  color: var(--ab-soft);
}

.page-about .partner-foot a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 198, 255, .45);
}

.page-about .partner-foot a:hover,
.page-about .partner-foot a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* ---------- 纠错 ---------- */
.page-about .fix-grid {
  display: grid;
  gap: 24px;
  margin-top: 30px;
}

.page-about .fix-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  counter-reset: fix;
}

.page-about .fix-steps li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--ab-line);
}

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

.page-about .fix-index {
  font-size: 20px;
  font-weight: 700;
  color: var(--neon);
  padding-top: 2px;
}

.page-about .fix-steps h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.page-about .fix-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-soft);
}

.page-about .fix-steps a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 198, 255, .45);
}

.page-about .fix-steps a:hover,
.page-about .fix-steps a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .fix-side {
  padding: 24px 22px;
}

.page-about .fix-side-title {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .fix-mail {
  margin: 10px 0 14px;
  font-family: var(--font-mono);
  font-size: 15px;
  word-break: break-all;
  color: var(--paper);
}

.page-about .fix-side .copy-btn {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid rgba(247, 201, 72, .6);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--gold);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background .22s var(--ease), color .22s var(--ease);
}

.page-about .fix-side .copy-btn:hover,
.page-about .fix-side .copy-btn:focus-visible {
  background: var(--gold);
  color: var(--ink);
}

.page-about .fix-side-note {
  margin: 16px 0 14px;
  font-size: 12.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .fix-side-line {
  margin: 0 0 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-soft);
}

.page-about .fix-side-line:last-child {
  margin-bottom: 0;
}

/* ---------- 四条规矩 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .principle-item {
  background: rgba(10, 7, 16, .74);
  padding: 22px 20px;
}

.page-about .principle-key {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .principle-item h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  line-height: 1.35;
}

.page-about .principle-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ab-soft);
}

.page-about .about-cta {
  margin-top: 34px;
  padding: 26px 22px;
  background: linear-gradient(135deg, rgba(74, 20, 112, .85), rgba(10, 7, 16, .85));
  border: 1px solid rgba(247, 201, 72, .3);
  border-radius: var(--r-lg);
}

.page-about .about-cta p {
  margin: 0 0 18px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 图片 ---------- */
.page-about .media-img {
  max-width: 100%;
  height: auto;
}

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

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

  .page-about .line-card--search {
    grid-column: 1 / -1;
  }

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

  .page-about .partner-card:last-child {
    grid-column: 1 / -1;
  }

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

@media (min-width: 880px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: center;
  }

  .page-about .hero-art {
    max-width: 420px;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .line-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .line-card--video {
    margin-top: 34px;
  }

  .page-about .line-card--search {
    grid-column: auto;
    margin-top: 68px;
  }

  .page-about .season-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-flow: row;
    grid-auto-columns: auto;
    overflow-x: visible;
    scroll-snap-type: none;
    padding-bottom: 0;
  }

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

  .page-about .partner-card:last-child {
    grid-column: auto;
  }

  .page-about .fix-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 1060px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 168px;
    gap: 46px;
    align-items: start;
  }

  .page-about .about-anchors {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
    padding-top: clamp(44px, 6vw, 76px);
  }

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

  .page-about .about-anchors a {
    display: block;
    padding: 7px 0 7px 12px;
    font-size: 13px;
    line-height: 1.4;
    color: var(--muted);
    text-decoration: none;
    border-left: 2px solid var(--ab-line);
    transition: color .2s var(--ease), border-color .2s var(--ease);
  }

  .page-about .about-anchors a:hover,
  .page-about .about-anchors a:focus-visible {
    color: var(--gold);
    border-left-color: var(--gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .season-node,
  .page-about .team-slice,
  .page-about .team-item,
  .page-about .ladder-trigger,
  .page-about .ladder-mark,
  .page-about .copy-btn,
  .page-about .line-link {
    transition: none;
  }

  .page-about .season-node:hover,
  .page-about .season-node:focus-within {
    transform: none;
  }

  .page-about .team-slice:hover {
    transform: none;
  }
}

.page-about {
  --step: 1rem;
}