.page-about {
  overflow-x: hidden;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-b);
}

.page-about section {
  padding: 64px 0;
}

.page-about .container {
  position: relative;
}

/* ===== 01 品牌宣言 ===== */
.page-about .about-manifesto {
  position: relative;
  padding-top: 24px;
  padding-bottom: 72px;
}

.page-about .about-manifesto::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 12% 18%, rgba(46, 139, 87, 0.12), transparent 28%),
    radial-gradient(circle at 88% 72%, rgba(255, 107, 53, 0.05), transparent 26%);
  pointer-events: none;
}

.page-about .about-manifesto .section-head {
  margin-bottom: 12px;
}

.page-about .about-manifesto__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .about-manifesto__title {
  font-family: var(--font-h);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
}

.page-about .about-manifesto__lead {
  color: var(--c-data);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.6;
  margin: 0 0 24px;
}

.page-about .about-manifesto__body p {
  color: var(--c-text-dim);
  font-size: 1rem;
  line-height: 1.75;
  margin: 0 0 16px;
}

.page-about .about-manifesto__stats {
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 32px;
}

.page-about .about-manifesto .stat-item {
  background: var(--c-panel);
  border-left: 3px solid var(--c-accent);
  padding: 16px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-manifesto .stat-item__value {
  font-family: var(--font-d);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.2;
}

.page-about .about-manifesto .stat-item__label {
  font-size: 0.82rem;
  color: var(--c-text-dim);
}

.page-about .about-manifesto__figure {
  margin: 0;
  background: linear-gradient(135deg, var(--c-panel), rgba(27, 42, 46, 0.4));
  border: 1px solid rgba(46, 139, 87, 0.4);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  padding: 10px;
}

.page-about .about-manifesto__figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-manifesto__figure figcaption {
  padding: 12px 6px 2px;
  color: var(--c-text-dim);
  font-size: 0.85rem;
}

.page-about .about-manifesto__keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 6px 4px;
}

/* ===== 02 发展历程 ===== */
.page-about .about-journey {
  position: relative;
  isolation: isolate;
  background: linear-gradient(180deg, rgba(10, 61, 46, 0.28), rgba(18, 24, 31, 0) 48%);
}

.page-about .about-journey::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: repeating-linear-gradient(-45deg, transparent 0 18px, rgba(46, 139, 87, 0.06) 18px 19px);
}

.page-about .about-journey .section-head {
  margin-bottom: 16px;
}

.page-about .about-journey__track {
  position: relative;
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  display: grid;
  gap: 48px;
}

.page-about .about-journey__track::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--c-line) 0 6px, transparent 6px 12px);
  opacity: 0.7;
}

.page-about .about-journey__item {
  position: relative;
  padding-left: 44px;
}

.page-about .about-journey__item::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 24px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.35);
  z-index: 1;
}

.page-about .about-journey__year {
  display: inline-block;
  font-family: var(--font-d);
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-accent);
  border-left: 3px solid var(--c-accent);
  background: rgba(18, 24, 31, 0.6);
  padding: 6px 12px;
  margin-bottom: 14px;
}

.page-about .about-journey__card {
  background: var(--c-panel);
  border: 1px solid rgba(46, 139, 87, 0.4);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  padding: 24px;
}

.page-about .about-journey__tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-journey__title {
  font-family: var(--font-h);
  font-size: 1.35rem;
  margin: 0 0 8px;
}

.page-about .about-journey__desc {
  color: var(--c-text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 12px;
}

.page-about .about-journey__more {
  border-top: 1px dashed var(--c-line);
  margin-top: 14px;
  padding-top: 10px;
}

.page-about .about-journey__more summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--c-data);
}

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

.page-about .about-journey__more summary::before {
  content: '＋ ';
  color: var(--c-accent);
}

.page-about .about-journey__more[open] summary::before {
  content: '－ ';
}

.page-about .about-journey__more p {
  margin: 12px 0 0;
  color: var(--c-text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== 03 数据能力 ===== */
.page-about .about-data {
  background: var(--c-bg-2);
  color: var(--c-text);
}

.page-about .about-data .section-head__title,
.page-about .about-data .section-head__desc {
  color: rgba(240, 244, 245, 0.92);
}

.page-about .about-data .section-head__desc {
  color: rgba(240, 244, 245, 0.72);
}

.page-about .about-data__grid {
  display: grid;
  gap: 40px;
  margin-top: 40px;
  align-items: start;
}

.page-about .about-data__figure {
  margin: 0;
}

.page-about .about-data__figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border: 2px solid rgba(46, 139, 87, 0.65);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-data__figure figcaption {
  color: rgba(240, 244, 245, 0.6);
  font-size: 0.85rem;
  padding: 12px 4px 0;
}

.page-about .about-data__tabs .tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .about-data__tabs .tabs__btn {
  font-family: var(--font-b);
  font-size: 0.9rem;
  color: rgba(240, 244, 245, 0.85);
  background: rgba(18, 24, 31, 0.45);
  border: 1px solid var(--c-line);
  padding: 10px 16px;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background var(--trans-fast), border-color var(--trans-fast), color var(--trans-fast);
}

.page-about .about-data__tabs .tabs__btn:hover,
.page-about .about-data__tabs .tabs__btn:focus-visible {
  border-color: var(--c-accent);
  color: #ffffff;
}

.page-about .about-data__tabs .tabs__btn[aria-selected="true"] {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
  font-weight: 700;
}

.page-about .about-data__tabs .tabs__panel {
  background: rgba(18, 24, 31, 0.6);
  border-left: 3px solid var(--c-accent);
  padding: 24px;
  margin-bottom: 14px;
}

.page-about .about-data__tabs .tabs__panel[hidden] {
  display: none;
}

.page-about .about-data__tabs .tabs__panel h3 {
  font-family: var(--font-h);
  font-size: 1.2rem;
  margin: 0 0 8px;
  color: #ffffff;
}

.page-about .about-data__tabs .tabs__panel p {
  color: rgba(240, 244, 245, 0.8);
  font-size: 0.95rem;
  line-height: 1.75;
  margin: 0 0 14px;
}

.page-about .about-data__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ===== 04 专家团队 ===== */
.page-about .about-team {
  position: relative;
  background: radial-gradient(circle at 85% 10%, rgba(212, 175, 55, 0.05), transparent 32%), var(--c-bg);
}

.page-about .about-team__grid {
  display: grid;
  gap: 20px;
  margin-top: 48px;
}

.page-about .about-team__card {
  position: relative;
  background: var(--c-panel);
  padding: 32px 24px 28px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .about-team__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--c-line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .about-team__card:nth-child(2)::before {
  background: var(--c-accent);
}

.page-about .about-team__card:nth-child(3)::before {
  background: var(--c-gold);
}

.page-about .about-team__index {
  font-family: var(--font-d);
  font-size: 2rem;
  font-weight: 700;
  color: var(--c-line);
  display: block;
  margin-bottom: 14px;
}

.page-about .about-team__card:nth-child(2) .about-team__index {
  color: var(--c-accent);
}

.page-about .about-team__card:nth-child(3) .about-team__index {
  color: var(--c-gold);
}

.page-about .about-team__card h3 {
  font-family: var(--font-h);
  font-size: 1.15rem;
  margin: 0 0 10px;
}

.page-about .about-team__card p {
  color: var(--c-text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-team__note {
  margin-top: 32px;
}

/* ===== 05 资质与认可 ===== */
.page-about .about-credential {
  background: linear-gradient(135deg, rgba(10, 61, 46, 0.25) 0%, rgba(18, 24, 31, 0) 65%);
  padding-bottom: 88px;
}

.page-about .about-credential__grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

.page-about .about-credential__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-credential__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
}

.page-about .about-credential__list p {
  margin: 0;
  color: var(--c-text-dim);
  font-size: 0.95rem;
  line-height: 1.6;
}

.page-about .about-credential__figure {
  margin: 0;
}

.page-about .about-credential__figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(212, 175, 55, 0.35);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about .about-credential__figure figcaption {
  color: var(--c-text-dim);
  font-size: 0.85rem;
  padding: 12px 4px 0;
}

/* ===== 06 信任声明 ===== */
.page-about .about-trust {
  padding-top: 24px;
  padding-bottom: 88px;
}

.page-about .about-trust__inner {
  padding: 48px 24px;
  text-align: center;
  border: 1px solid rgba(46, 139, 87, 0.45);
  background: linear-gradient(135deg, rgba(10, 61, 46, 0.9), rgba(18, 24, 31, 0.85));
}

.page-about .about-trust__title {
  font-family: var(--font-h);
  font-size: 1.8rem;
  margin: 0 0 12px;
}

.page-about .about-trust__desc {
  color: var(--c-text-dim);
  font-size: 0.975rem;
  line-height: 1.75;
  max-width: 680px;
  margin: 0 auto 28px;
}

.page-about .about-trust__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 820px) {
  .page-about section {
    padding: 88px 0;
  }

  .page-about .about-manifesto {
    padding-top: 40px;
  }

  .page-about .about-manifesto__inner {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    gap: 64px;
  }

  .page-about .about-manifesto__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .about-journey__track {
    max-width: 860px;
  }

  .page-about .about-journey__item {
    padding-left: 64px;
  }

  .page-about .about-journey__track::before {
    left: 15px;
  }

  .page-about .about-journey__item::before {
    left: 6px;
  }

  .page-about .about-journey__year {
    margin-bottom: 16px;
  }

  .page-about .about-data__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
  }

  .page-about .about-data__tabs {
    order: 1;
  }

  .page-about .about-data__figure {
    order: 2;
    position: sticky;
    top: 32px;
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-credential__grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-about .about-trust {
    padding-bottom: 104px;
  }
}