.page-about {
  --about-tl-pad: clamp(22px, 4vw, 46px);
  --about-tl-line: 6px;
  --about-gap: clamp(24px, 3.6vw, 48px);
}

/* ---------- 面包屑后的首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(18px, 3vw, 42px) clamp(28px, 5vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 52px);
  align-items: center;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(2.35rem, 7vw, 4.9rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.page-about .about-hero__intro {
  margin: clamp(14px, 2vw, 22px) 0 0;
  max-width: 42ch;
  font-size: clamp(1rem, 1.15vw, 1.12rem);
  line-height: 1.78;
  color: var(--body-ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 32px);
}

/* ---------- 页面图框 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-figure__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px clamp(12px, 2vw, 20px) 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  background: linear-gradient(180deg, rgba(4, 16, 15, 0) 0%, rgba(4, 16, 15, .9) 100%);
}

.page-about .about-figure--timeline {
  margin-top: clamp(24px, 3.6vw, 44px);
}

/* ---------- 分节框架 ---------- */
.page-about .about-section {
  padding-block: clamp(34px, 5.4vw, 80px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-head__lede {
  margin: 0;
  max-width: 46ch;
  line-height: 1.78;
  color: var(--body-ink);
}

.page-about .about-note {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--steel);
}

/* ---------- 01 赛前麻烦 ---------- */
.page-about .pain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .pain-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-block: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid var(--line-soft);
}

.page-about .pain-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .pain-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .pain-body h3 {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 1.5vw, 1.28rem);
  font-weight: 700;
  color: var(--mist);
}

.page-about .pain-body p {
  margin: 0;
  max-width: 58ch;
  line-height: 1.78;
  color: var(--body-ink);
}

/* ---------- 02 覆盖范围 ---------- */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 28px);
  background: var(--ink-800);
}

.page-about .stat__num {
  font-weight: 800;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: .92;
  letter-spacing: -0.03em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.page-about .stat__unit {
  margin-left: .12em;
  font-size: .3em;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--cyan);
}

.page-about .stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--steel);
}

.page-about .cover-grid {
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .cover-cell {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: clamp(10px, 1.4vw, 16px);
  background: var(--ink-800);
  min-width: 0;
  transition: background 200ms var(--ease);
}

.page-about .cover-cell:hover {
  background: var(--ink-950);
}

.page-about .cover-prov {
  font-size: clamp(.85rem, 1.05vw, 1rem);
  font-weight: 600;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.page-about .cover-sport {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.45;
  letter-spacing: .03em;
  color: var(--steel);
  overflow-wrap: anywhere;
  transition: color 200ms var(--ease);
}

.page-about .cover-cell:hover .cover-sport {
  color: var(--lime);
}

/* ---------- 03 版本演进时间轴 ---------- */
.page-about .timeline {
  position: relative;
  padding-left: var(--about-tl-pad);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--about-tl-line);
  top: .6em;
  bottom: .6em;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 58%, rgba(23, 224, 200, 0) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-block: clamp(12px, 1.8vw, 18px);
  border-top: 1px solid var(--line-soft);
}

.page-about .tl-item:first-child {
  border-top: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-tl-line) - var(--about-tl-pad) - 3px);
  top: calc(clamp(12px, 1.8vw, 18px) + .72em);
  width: 7px;
  height: 7px;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(198, 255, 61, .16);
}

.page-about .tl-summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 5px;
  padding: 2px 0;
}

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

.page-about .tl-title {
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--mist);
}

.page-about .tl-meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--steel);
  transition: color 200ms var(--ease);
}

.page-about .tl-item[open] .tl-meta {
  color: var(--cyan);
}

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .tl-body {
  max-width: 58ch;
  padding-top: 10px;
  line-height: 1.78;
  color: var(--body-ink);
}

.page-about .tl-body p {
  margin: 0;
}

/* ---------- 04 团队与分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .team-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: baseline;
  padding-block: 13px;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .team-role {
  font-weight: 600;
  color: var(--mist);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--lime);
}

.page-about .team-desc {
  grid-column: 1 / -1;
  font-size: .93rem;
  line-height: 1.65;
  color: var(--steel);
}

/* ---------- 05 稳定性 ---------- */
.page-about .stable-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stable-item {
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--ink-800);
}

.page-about .stable-item h3 {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .stable-item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.72;
  color: var(--body-ink);
}

/* ---------- 06 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .eco-copy p {
  margin: 0 0 1.1em;
  max-width: 56ch;
  line-height: 1.78;
  color: var(--body-ink);
}

.page-about .eco-copy .btn {
  margin-top: .6em;
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .eco-list li {
  display: grid;
  gap: 6px;
  padding-block: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .eco-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .eco-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--cyan);
}

.page-about .eco-val {
  font-size: 1rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding-block: clamp(38px, 6vw, 88px);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 12% 0%, rgba(23, 224, 200, .12) 0%, rgba(23, 224, 200, 0) 62%),
    var(--ink-800);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  align-items: center;
}

.page-about .about-cta__copy h2 {
  margin: 10px 0 12px;
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 50ch;
  line-height: 1.78;
  color: var(--body-ink);
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .pain-item {
    grid-template-columns: clamp(52px, 7vw, 104px) minmax(0, 1fr);
    gap: clamp(16px, 3vw, 40px);
    align-items: start;
  }

  .page-about .pain-num {
    padding-top: 5px;
  }

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

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

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

  .page-about .tl-summary {
    grid-template-columns: minmax(0, 1fr) minmax(140px, 220px);
    align-items: baseline;
    gap: 20px;
  }

  .page-about .tl-meta {
    text-align: right;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }

  .page-about .team-grid,
  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }

  .page-about .cover-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1200px) {
  .page-about .cover-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cover-cell,
  .page-about .cover-sport,
  .page-about .tl-meta {
    transition: none;
  }
}