.page-about {
  --about-line: rgba(143, 169, 189, 0.18);
  --about-cyan-soft: rgba(31, 242, 209, 0.14);
  --about-gold-soft: rgba(217, 179, 108, 0.22);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-top: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 58% at 88% 6%, var(--about-cyan-soft), transparent 70%),
    radial-gradient(46% 46% at 4% 92%, rgba(255, 138, 61, 0.09), transparent 72%);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 8vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0.55rem 0 1.1rem;
  max-width: 14em;
  color: var(--paper-050);
}

.page-about .about-hero .lede {
  max-width: 42em;
  color: var(--soft);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 1.3rem 0 0;
  border-top: 1px solid var(--about-gold-soft);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.page-about .hero-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 6.5vw, 3.2rem);
  line-height: 1;
  color: var(--orange-500);
  letter-spacing: -0.02em;
}

.page-about .hero-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--slate-400);
  letter-spacing: 0.04em;
}

/* ---------- 章节头 ---------- */
.page-about .chapter-head {
  max-width: 60ch;
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .chapter-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 5vw, 2.6rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 0.45rem 0 0.9rem;
  color: var(--paper-050);
}

.page-about .chapter-head .lede {
  color: var(--soft);
  max-width: 40em;
}

/* ---------- 阶段标签 ---------- */
.page-about .stage-pills {
  margin-bottom: clamp(1.6rem, 3.5vw, 2.4rem);
}

.page-about .stage-pills a {
  text-decoration: none;
}

/* ---------- 阶段时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.9rem;
  padding-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 1.2rem;
  top: 2.1rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(31, 242, 209, 0.42), rgba(31, 242, 209, 0.04));
}

.page-about .tl-node:last-child::before {
  display: none;
}

.page-about .tl-idx {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--gold-400);
  padding-top: 0.35rem;
  letter-spacing: 0.06em;
}

.page-about .tl-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 3.4vw, 1.55rem);
  line-height: 1.35;
  margin: 0 0 0.6rem;
  color: var(--paper-050);
}

.page-about .tl-body p {
  margin: 0 0 0.8rem;
  color: var(--soft);
  max-width: 40em;
}

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

.page-about .tl-media {
  margin: 1.2rem 0 0;
}

/* ---------- 球队库分栏 ---------- */
.page-about .prose-split {
  display: grid;
  gap: 1.6rem;
}

.page-about .split-copy p {
  margin: 0 0 1rem;
  color: var(--soft);
  max-width: 40em;
}

.page-about .split-copy p:last-child {
  margin-bottom: 0;
}

.page-about .lib-panel {
  padding: clamp(1.2rem, 3.5vw, 2rem);
}

.page-about .panel-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-500);
  margin: 0 0 1.1rem;
}

.page-about .dim-list {
  margin: 0;
  padding: 0;
}

.page-about .dim-row {
  padding: 0.85rem 0;
  border-top: 1px solid var(--about-line);
}

.page-about .dim-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .dim-row dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper-050);
  margin-bottom: 0.3rem;
}

.page-about .dim-row dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-about .panel-note {
  margin: 1.2rem 0 0;
  font-size: 0.88rem;
  color: var(--slate-400);
}

.page-about .panel-note a {
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 209, 0.4);
}

.page-about .panel-note a:hover {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 1.8rem;
}

.page-about .team-copy h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 5vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 0.45rem 0 0.9rem;
  color: var(--paper-050);
}

.page-about .team-copy > p {
  margin: 0 0 1rem;
  color: var(--soft);
  max-width: 40em;
}

.page-about .role-list {
  list-style: none;
  margin: 1.4rem 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 0.95rem 1rem;
  border-radius: var(--r-md);
  background: var(--ink-800);
  border: 1px solid var(--about-line);
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--orange-500);
}

.page-about .role-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper-050);
  margin-bottom: 0.3rem;
}

.page-about .role-desc {
  display: block;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--slate-400);
}

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

/* ---------- 数据质量 ---------- */
.page-about .qa-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .qa-step {
  position: relative;
  padding: 1.2rem 1.2rem 1.2rem 1.3rem;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--cyan-700);
  background: linear-gradient(160deg, var(--ink-800), rgba(13, 42, 64, 0.35));
}

.page-about .qa-mark {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--gold-400);
  margin-bottom: 0.6rem;
}

.page-about .qa-step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 3.2vw, 1.3rem);
  margin: 0 0 0.55rem;
  color: var(--paper-050);
}

.page-about .qa-step p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .quality-tail {
  margin: 1.5rem 0 0;
  color: var(--soft);
  max-width: 46em;
}

.page-about .quality-tail a {
  color: var(--cyan-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 242, 209, 0.4);
}

.page-about .quality-tail a:hover {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.page-about .eco-item {
  padding: 1.1rem 1rem;
  border-radius: var(--r-md);
  background: var(--ink-800);
  border: 1px solid var(--about-line);
  transition: border-color 180ms ease, transform 180ms ease;
}

.page-about .eco-item:hover {
  border-color: rgba(31, 242, 209, 0.5);
  transform: translateY(-2px);
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5.5vw, 2.2rem);
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .eco-unit {
  font-size: 0.62em;
  color: var(--cyan-700);
  margin-left: 0.08em;
}

.page-about .eco-label {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--paper-050);
}

.page-about .eco-desc {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--slate-400);
}

.page-about .eco-media {
  margin: 1.6rem 0 0;
}

.page-about .eco-tail {
  margin-top: 1.5rem;
  display: grid;
  gap: 1rem;
}

.page-about .eco-tail p {
  margin: 0;
  color: var(--soft);
  max-width: 46em;
}

/* ---------- 收尾 ---------- */
.page-about .closing-panel {
  position: relative;
  isolation: isolate;
  padding: clamp(1.4rem, 4vw, 2.6rem);
  border-radius: var(--r-lg);
  border: 1px solid var(--about-gold-soft);
  background: linear-gradient(150deg, var(--ink-800), rgba(11, 79, 90, 0.55));
  overflow: hidden;
}

.page-about .closing-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(50% 60% at 92% 8%, rgba(31, 242, 209, 0.13), transparent 72%),
    radial-gradient(40% 50% at 6% 96%, rgba(255, 138, 61, 0.1), transparent 74%);
}

.page-about .closing-panel h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 0.45rem 0 0.9rem;
  color: var(--paper-050);
}

.page-about .closing-panel > p {
  margin: 0 0 1.3rem;
  color: var(--soft);
  max-width: 44em;
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.6rem;
}

.page-about .closing-actions .btn {
  text-decoration: none;
}

.page-about .closing-contact {
  margin: 0 0 1rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--about-line);
  display: grid;
  gap: 0.8rem;
}

.page-about .closing-contact dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--slate-400);
  margin-bottom: 0.25rem;
}

.page-about .closing-contact dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--paper-050);
  word-break: break-word;
}

.page-about .closing-contact dd a {
  color: var(--cyan-500);
  text-decoration: none;
}

.page-about .closing-contact dd a:hover {
  color: var(--orange-500);
}

.page-about .closing-note {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--slate-400);
  max-width: 46em;
}

/* ---------- 图片 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .qa-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: clamp(2.5rem, 5vw, 4.5rem);
    padding-bottom: clamp(2.5rem, 5vw, 4rem);
  }

  .page-about .hero-stats {
    gap: 2rem;
    max-width: 42rem;
  }

  .page-about .tl-node {
    grid-template-columns: 6rem minmax(0, 1fr);
    gap: 2.2rem;
    padding-bottom: 2.8rem;
  }

  .page-about .tl-node::before {
    left: 3rem;
    top: 2.6rem;
  }

  .page-about .tl-idx {
    font-size: 2.4rem;
    padding-top: 0;
    letter-spacing: 0.02em;
  }

  .page-about .prose-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 2.6rem;
    align-items: start;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 2.8rem;
    align-items: center;
  }

  .page-about .eco-media {
    margin-top: 2rem;
  }

  .page-about .closing-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.6fr);
    gap: 2rem;
  }
}

@media (min-width: 1180px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .eco-item {
    transition: none;
  }

  .page-about .eco-item:hover {
    transform: none;
  }
}