.page-about {
  --about-gold-soft: rgba(245, 185, 74, 0.1);
  --about-green-soft: rgba(24, 208, 156, 0.1);
  --about-orange-soft: rgba(255, 122, 69, 0.1);
  --about-cyan-soft: rgba(90, 200, 250, 0.1);
  --about-chart-soft: rgba(61, 123, 255, 0.12);
  position: relative;
  background:
    radial-gradient(1100px 460px at 88% -4%, var(--about-gold-soft), transparent 62%),
    radial-gradient(900px 420px at 4% 18%, var(--about-chart-soft), transparent 58%);
}

.page-about .about-wrap {
  padding-block: clamp(2.2rem, 6vw, 4.5rem) clamp(3rem, 7vw, 6rem);
}

/* 页面头部 */
.page-about .page-head {
  position: relative;
  padding-block: clamp(2.6rem, 6vw, 5.2rem) clamp(1rem, 3vw, 2.2rem);
  border-bottom: 1px solid var(--line-divider);
}

.page-about .page-head::after {
  content: "EST. / 2017";
  position: absolute;
  top: 2.2rem;
  right: 0;
  padding: 8px 16px;
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-pill);
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--gold-accent);
}

.page-about .page-kicker {
  margin: 0 0 0.9rem;
  font-family: var(--font-data);
  font-size: 0.9rem;
  letter-spacing: 0.16em;
  color: var(--gold-accent);
}

.page-about .page-title {
  margin: 0 0 0.7rem;
  max-width: 850px;
  font-size: clamp(2.6rem, 6.4vw, 5.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .page-lead {
  max-width: 720px;
  margin: 0;
  color: var(--text-secondary);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.85;
}

/* 内容目录 */
.page-about .page-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-block: 1.6rem 0;
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--line-divider);
}

.page-about .toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px 9px 12px;
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  border-color: rgba(245, 185, 74, 0.55);
  color: var(--gold-accent);
  background: var(--about-gold-soft);
}

.page-about .toc-link__num {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--gold-accent);
}

/* 章节通用 */
.page-about .about-section {
  padding-block: clamp(2.8rem, 6vw, 5rem) clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line-divider);
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.2rem;
  margin-bottom: 2rem;
}

.page-about .section-index {
  font-family: var(--font-data);
  font-size: 1rem;
  color: var(--gold-accent);
  letter-spacing: 0.1em;
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(1.8rem, 3.6vw, 2.9rem);
  line-height: 1.15;
}

.page-about .section-desc {
  width: 100%;
  max-width: 760px;
  margin: 0.1rem 0 0;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
}

/* 01 品牌故事 */
.page-about .story-grid {
  display: grid;
  gap: clamp(1.2rem, 2.6vw, 2.4rem);
}

.page-about .story-copy {
  padding: clamp(1.3rem, 2.8vw, 2.2rem);
  background:
    linear-gradient(145deg, rgba(245, 185, 74, 0.06), transparent 46%),
    var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .story-text-lead {
  margin: 0 0 1rem;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 600;
  line-height: 1.6;
}

.page-about .story-copy p {
  margin: 0 0 1rem;
  color: var(--text-primary);
  line-height: 1.85;
}

.page-about .story-copy .btn {
  margin-top: 0.6rem;
}

.page-about .story-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(0.6rem, 1.6vw, 1rem);
}

.page-about .story-stat {
  padding: clamp(0.85rem, 1.8vw, 1.25rem);
  background: var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .story-stat:hover {
  border-color: rgba(245, 185, 74, 0.4);
  transform: translateY(-2px);
}

.page-about .story-stat__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.4rem, 2.6vw, 2.1rem);
  line-height: 1.2;
  color: var(--text-primary);
}

.page-about .story-stat__num--gold { color: var(--gold-accent); }
.page-about .story-stat__num--green { color: var(--green-live); }
.page-about .story-stat__num--orange { color: var(--orange-alert); }
.page-about .story-stat__num--cyan { color: var(--cyan-link); }

.page-about .story-stat__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* 02 数据方法论 */
.page-about .method-kpis {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.6rem, 1.8vw, 1.2rem);
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .method-kpi {
  padding: clamp(1rem, 2vw, 1.35rem) clamp(0.9rem, 1.8vw, 1.4rem);
  background:
    linear-gradient(160deg, rgba(61, 123, 255, 0.1), transparent 55%),
    var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
}

.page-about .method-kpi__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  color: var(--gold-accent);
  line-height: 1.2;
}

.page-about .method-kpi__num--green { color: var(--green-live); }
.page-about .method-kpi__num--orange { color: var(--orange-alert); }

.page-about .method-kpi__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.page-about .method-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(0.5rem, 1.2vw, 0.9rem);
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .method-step {
  flex: 1 1 135px;
  min-width: 0;
  padding: clamp(1rem, 1.8vw, 1.3rem);
  background: var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: border-color var(--transition), filter var(--transition);
}

.page-about .method-step:hover,
.page-about .method-step:focus-within {
  border-color: rgba(245, 185, 74, 0.5);
  filter: drop-shadow(0 0 12px rgba(245, 185, 74, 0.16));
}

.page-about .method-step__num {
  display: block;
  margin-bottom: 0.55rem;
  font-family: var(--font-data);
  font-size: 0.74rem;
  color: var(--chart-blue);
  letter-spacing: 0.12em;
}

.page-about .method-step h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  line-height: 1.4;
}

.page-about .method-step p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.page-about .step-connector {
  flex: 0 0 30px;
  width: 30px;
  height: 18px;
  align-self: center;
}

.page-about .step-connector path {
  stroke: var(--gold-accent);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .method-figure,
.page-about .milestone-figure,
.page-about .team-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
  background: var(--panel-deep);
}

.page-about .method-figure img,
.page-about .milestone-figure img,
.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .method-figure figcaption,
.page-about .milestone-figure figcaption,
.page-about .team-figure figcaption {
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--line-divider);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.page-about .method-figure {
  max-width: 820px;
}

.page-about .method-note {
  max-width: 820px;
  margin: 1.6rem 0 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .method-note a {
  color: var(--cyan-link);
}

/* 03 团队与体系 */
.page-about .team-grid {
  display: grid;
  gap: clamp(1.2rem, 2.6vw, 2.4rem);
}

.page-about .team-tabs {
  position: relative;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
}

.page-about .team-radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.page-about .team-tabbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

.page-about .team-tabbar label {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.page-about .team-tabbar label:hover {
  border-color: rgba(245, 185, 74, 0.5);
  color: var(--gold-accent);
}

.page-about .team-panel {
  display: none;
  border-top: 1px solid var(--line-divider);
  padding-top: 1.1rem;
}

.page-about .team-panel h3 {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
}

.page-about .team-panel p {
  margin: 0 0 0.8rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .team-panel ul {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-panel li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.page-about .team-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  background: var(--gold-accent);
  transform: rotate(45deg);
}

.page-about .team-tabs #team-tab-source:checked ~ .team-tabbar label[for="team-tab-source"],
.page-about .team-tabs #team-tab-verify:checked ~ .team-tabbar label[for="team-tab-verify"],
.page-about .team-tabs #team-tab-ops:checked ~ .team-tabbar label[for="team-tab-ops"],
.page-about .team-tabs #team-tab-model:checked ~ .team-tabbar label[for="team-tab-model"] {
  background: var(--gold-accent);
  border-color: var(--gold-accent);
  color: var(--bg-ink);
  font-weight: 600;
}

.page-about .team-tabs #team-tab-source:checked ~ .team-panels .team-panel[data-role="source"],
.page-about .team-tabs #team-tab-verify:checked ~ .team-panels .team-panel[data-role="verify"],
.page-about .team-tabs #team-tab-ops:checked ~ .team-panels .team-panel[data-role="ops"],
.page-about .team-tabs #team-tab-model:checked ~ .team-panels .team-panel[data-role="model"] {
  display: block;
}

.page-about .team-tabs #team-tab-source:focus-visible ~ .team-tabbar label[for="team-tab-source"],
.page-about .team-tabs #team-tab-verify:focus-visible ~ .team-tabbar label[for="team-tab-verify"],
.page-about .team-tabs #team-tab-ops:focus-visible ~ .team-tabbar label[for="team-tab-ops"],
.page-about .team-tabs #team-tab-model:focus-visible ~ .team-tabbar label[for="team-tab-model"] {
  outline: 2px solid var(--gold-accent);
  outline-offset: 2px;
}

.page-about .team-aside {
  display: grid;
  gap: 1.2rem;
  align-content: start;
}

.page-about .team-figure {
  max-width: 720px;
}

.page-about .team-products,
.page-about .member-tiers {
  padding: 1.2rem 1.3rem;
  background: var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
}

.page-about .team-products h3 {
  margin: 0 0 0.9rem;
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.page-about .team-products ul {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-products li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.page-about .team-products li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  background: var(--gold-accent);
  transform: rotate(45deg);
}

.page-about .team-products strong {
  display: block;
  color: var(--text-primary);
  font-weight: 600;
}

.page-about .member-tiers {
  display: grid;
  gap: 0.6rem;
}

.page-about .member-tier {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px dashed var(--line-divider);
}

.page-about .member-tier:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .member-tier__name {
  font-family: var(--font-data);
  font-size: 0.92rem;
  color: var(--gold-accent);
  white-space: nowrap;
}

.page-about .member-tier__desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-align: right;
}

.page-about .team-aside .btn {
  justify-self: start;
}

/* 04 发展里程碑 */
.page-about .timeline {
  --tl-col: 88px;
  --tl-gap: 14px;
  position: relative;
  margin-block: 1.5rem 2.4rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-col) + var(--tl-gap) / 2 - 0.5px);
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: linear-gradient(to bottom, transparent 0%, var(--line-divider) 4%, var(--line-divider) 96%, transparent 100%);
}

.page-about .timeline-item {
  display: grid;
  grid-template-columns: var(--tl-col) 1fr;
  gap: var(--tl-gap);
  position: relative;
}

.page-about .timeline-year {
  position: relative;
  padding-top: 1.3rem;
  text-align: right;
}

.page-about .timeline-year__num {
  display: block;
  font-family: var(--font-data);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.25;
  transition: color var(--transition);
}

.page-about .timeline-year__ver {
  display: inline-flex;
  margin-top: 0.4rem;
  padding: 3px 8px;
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-pill);
  font-family: var(--font-data);
  font-size: 0.68rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.page-about .timeline-dot {
  position: absolute;
  top: 1.35rem;
  right: calc(var(--tl-gap) / -2 - 4.5px);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--panel-deep);
  border: 2px solid var(--gold-accent);
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
}

.page-about .timeline-dot--gold {
  border-color: var(--gold-accent);
  background: var(--gold-accent);
}

.page-about .timeline-content {
  position: relative;
  padding: 1.1rem 1.1rem 1rem;
  margin-bottom: 1rem;
  background: var(--panel-deep);
  border: 1px solid var(--line-divider);
  border-radius: var(--radius-card);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .timeline-content h3 {
  margin: 0 0 0.5rem;
  font-size: 1.04rem;
  line-height: 1.4;
}

.page-about .timeline-content p {
  margin: 0 0 0.7rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .timeline-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--cyan-link);
  text-decoration: none;
  border-bottom: 1px solid rgba(90, 200, 250, 0.35);
}

.page-about .timeline-link:hover {
  color: var(--gold-accent);
  border-color: rgba(245, 185, 74, 0.5);
}

.page-about .timeline-tag {
  margin-top: 0.2rem;
}

.page-about .tag-label--cyan {
  color: var(--cyan-link);
  border-color: rgba(90, 200, 250, 0.4);
  background: var(--about-cyan-soft);
}

.page-about .timeline-item:hover .timeline-year__num {
  color: var(--gold-accent);
}

.page-about .timeline-item:hover .timeline-year__ver {
  border-color: rgba(245, 185, 74, 0.5);
  color: var(--gold-accent);
}

.page-about .timeline-item:hover .timeline-dot {
  background: var(--gold-accent);
  transform: scale(1.2);
  box-shadow: 0 0 0 5px rgba(245, 185, 74, 0.16);
}

.page-about .timeline-item:hover .timeline-content {
  border-color: rgba(245, 185, 74, 0.45);
  background: linear-gradient(145deg, rgba(245, 185, 74, 0.05), transparent 45%), var(--panel-deep);
}

.page-about .milestone-figure {
  max-width: 1000px;
}

/* 响应式 */
@media (max-width: 767px) {
  .page-about .page-head::after {
    display: none;
  }

  .page-about .method-steps {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .step-connector {
    align-self: center;
    width: 18px;
    height: 34px;
    transform: rotate(90deg);
    margin-block: 2px;
  }

  .page-about .timeline {
    --tl-col: 68px;
    --tl-gap: 12px;
  }

  .page-about .timeline-year__num {
    font-size: 0.95rem;
  }

  .page-about .timeline-year__ver {
    font-size: 0.62rem;
  }
}

@media (max-width: 480px) {
  .page-about .member-tier {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
  }

  .page-about .member-tier__desc {
    text-align: left;
  }
}

@media (max-width: 380px) {
  .page-about .story-stats {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) {
  .page-about .method-kpis {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .timeline {
    --tl-col: 190px;
    --tl-gap: 30px;
  }

  .page-about .timeline-year__num {
    font-size: 1.5rem;
  }

  .page-about .timeline-content {
    padding: 1.3rem 1.4rem 1.15rem;
  }
}

@media (min-width: 992px) {
  .page-about .story-grid,
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
  }
}