.page-about {
  --ab-gold: #E8B74A;
  --ab-red: #E6392B;
  --ab-red-soft: #FF6B35;
  --ab-gold-line: rgba(232, 183, 74, .28);
  --ab-gold-glow: rgba(232, 183, 74, .12);
  --ab-grad-fire: linear-gradient(135deg, #E6392B 0%, #FF6B35 100%);
  position: relative;
  overflow-x: hidden;
  background: var(--c-bg);
  color: var(--c-white);
  font-family: var(--font-body);
}

.page-about a:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 2px;
}

.page-about .mono-label {
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-gold);
}

/* ========== 首屏封面 ========== */
.page-about .ab-cover {
  position: relative;
  padding: 28px 20px 36px;
  background:
    radial-gradient(ellipse at 82% 12%, rgba(230, 57, 43, .18) 0%, transparent 42%),
    radial-gradient(ellipse at 6% 92%, rgba(232, 183, 74, .1) 0%, transparent 38%),
    var(--c-bg);
  border-bottom: 1px solid rgba(232, 183, 74, .2);
}

.page-about .ab-cover-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
  color: var(--c-gray);
  font-size: .8rem;
}

.page-about .ab-cover-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-top: 28px;
}

.page-about .ab-kicker {
  margin: 0 0 12px;
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .ab-title {
  margin: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(2.6rem, 8vw, 4.9rem);
  line-height: .98;
  letter-spacing: -.01em;
  text-transform: uppercase;
  color: var(--c-white);
}

.page-about .ab-subtitle {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.7rem);
  color: var(--c-gold);
}

.page-about .ab-lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--c-gray);
}

.page-about .ab-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--c-line);
}

.page-about .ab-index-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid rgba(242, 245, 249, .14);
  border-radius: 999px;
  color: var(--c-white);
  font-size: .78rem;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color .25s, background .25s;
}

.page-about .ab-index-item:hover {
  border-color: var(--c-gold);
  background: rgba(232, 183, 74, .08);
}

.page-about .ab-index-item .mono-label {
  color: var(--c-gold);
  font-size: .68rem;
}

.page-about .ab-cover-visual {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid rgba(242, 245, 249, .1);
}

.page-about .ab-cover-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .ab-cover-stamp {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 5px 9px;
  font-size: .66rem;
  letter-spacing: .12em;
  color: var(--c-gold);
  background: rgba(10, 15, 30, .72);
  border: 1px solid rgba(232, 183, 74, .3);
  backdrop-filter: blur(4px);
}

/* ========== 通用章节 ========== */
.page-about .ab-section {
  position: relative;
  padding: 44px 20px 52px;
  border-top: 1px solid rgba(230, 57, 43, .18);
}

.page-about .ab-section:last-of-type {
  border-top: 1px solid rgba(230, 57, 43, .18);
  border-bottom: 0;
}

.page-about .ab-section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  position: relative;
}

.page-about .ab-section-head::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 74px;
  height: 2px;
  background: linear-gradient(to right, var(--c-gold), rgba(232, 183, 74, .06));
}

.page-about .ab-section-no {
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--c-gold);
}

.page-about .ab-section-title {
  margin: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.65rem, 3.6vw, 2.5rem);
  letter-spacing: .01em;
  color: var(--c-white);
}

/* ========== 我们是谁 ========== */
.page-about .ab-who-grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .ab-who-statement {
  max-width: 720px;
}

.page-about .ab-who-lead {
  margin: 0 0 12px;
  font-size: 1.12rem;
  line-height: 1.7;
  font-weight: 500;
  color: var(--c-white);
}

.page-about .ab-who-statement p {
  margin: 12px 0 0;
  font-size: .94rem;
  line-height: 1.82;
  color: var(--c-gray);
}

.page-about .ab-who-principles {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .ab-principle {
  position: relative;
  padding: 18px 20px 18px 56px;
  border: 1px solid rgba(242, 245, 249, .09);
  background: linear-gradient(135deg, rgba(24, 34, 53, .5) 0%, rgba(14, 21, 34, .4) 100%);
  border-radius: 3px;
}

.page-about .ab-principle-no {
  position: absolute;
  left: 16px;
  top: 22px;
  font-size: .66rem;
  color: var(--c-gold);
}

.page-about .ab-principle-title {
  margin: 0;
  font-size: .98rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .ab-principle p {
  margin: 6px 0 0;
  font-size: .86rem;
  line-height: 1.65;
  color: var(--c-gray);
}

/* ========== 数据能力 ========== */
.page-about .ab-data-grid {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .ab-data-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: rgba(24, 34, 53, .42);
  border: 1px solid rgba(242, 245, 249, .08);
  border-radius: 3px;
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--c-white);
}

.page-about .ab-stat-label {
  font-size: .76rem;
  line-height: 1.4;
  color: var(--c-gray);
}

.page-about .ab-data-visual {
  overflow: hidden;
  border-radius: 4px;
  border: 1px solid rgba(242, 245, 249, .1);
}

.page-about .ab-data-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-data-caption {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--c-gold);
  font-size: .88rem;
  line-height: 1.8;
  color: var(--c-gray);
}

/* ========== 里程碑时间轴 ========== */
.page-about .ab-history-inner {
  max-width: 780px;
}

.page-about .ab-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-about .ab-timeline::before {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 11px;
  width: 1px;
  background: linear-gradient(to bottom, var(--c-gold) 0%, rgba(232, 183, 74, .14) 70%, rgba(232, 183, 74, .04) 100%);
}

.page-about .ab-timeline-item {
  position: relative;
  padding: 0 0 30px 42px;
}

.page-about .ab-timeline-item::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(10, 15, 30, .95), 0 0 0 1px var(--c-gold);
}

.page-about .ab-timeline-item--active::before {
  background: var(--c-red);
  box-shadow: 0 0 0 3px rgba(10, 15, 30, .95), 0 0 0 1px var(--c-red), 0 0 14px rgba(230, 57, 43, .55);
}

.page-about .ab-timeline-version {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--c-gold);
  background: rgba(232, 183, 74, .08);
  border: 1px solid rgba(232, 183, 74, .22);
  border-radius: 2px;
}

.page-about .ab-timeline-item--active .ab-timeline-version {
  color: #0A0F1E;
  background: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .ab-timeline-title {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .ab-timeline-desc {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--c-gray);
}

/* ========== 资质与信息安全 ========== */
.page-about .ab-cert-grid {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.page-about .ab-cert-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-cert-listitem {
  display: flex;
  gap: 16px;
  padding: 18px;
  border: 1px solid rgba(232, 183, 74, .22);
  border-radius: 4px;
  background: linear-gradient(135deg, rgba(232, 183, 74, .08) 0%, rgba(10, 15, 30, .2) 55%);
}

.page-about .ab-cert-badge {
  flex: 0 0 auto;
  align-self: flex-start;
  padding: 6px 10px;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: #0A0F1E;
  background: var(--c-gold);
  border-radius: 2px;
}

.page-about .ab-cert-info h3 {
  margin: 0 0 6px;
  font-size: .95rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .ab-cert-info p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .ab-cert-visual {
  overflow: hidden;
  border-radius: 4px;
  border: 1px solid rgba(242, 245, 249, .1);
  max-width: 420px;
}

.page-about .ab-cert-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ========== 团队与文化 ========== */
.page-about .ab-team-grid {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.page-about .ab-team-intro p {
  margin: 10px 0 0;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--c-gray);
}

.page-about .ab-team-lead {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 500;
  line-height: 1.7;
  color: var(--c-white);
}

.page-about .ab-team-flow {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  background: rgba(14, 21, 34, .72);
  border: 1px solid rgba(242, 245, 249, .08);
  border-radius: 4px;
}

.page-about .ab-flow-node {
  display: grid;
  grid-template-columns: 72px 1fr;
  grid-template-rows: auto auto;
  gap: 2px 14px;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid rgba(242, 245, 249, .1);
  background: var(--c-panel);
  border-radius: 3px;
}

.page-about .ab-flow-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
}

.page-about .ab-flow-name {
  font-size: .94rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .ab-flow-desc {
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--c-gray);
}

.page-about .ab-flow-arrow {
  align-self: center;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--c-gold);
  transform: rotate(90deg);
}

.page-about .ab-team-values {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-team-value {
  display: inline-block;
  padding: 6px 14px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--c-gold);
  background: rgba(232, 183, 74, .07);
  border: 1px solid rgba(232, 183, 74, .25);
  border-radius: 999px;
}

/* ========== 合作伙伴 ========== */
.page-about .ab-partners-grid {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .ab-partner-item {
  padding: 4px 0 2px 20px;
  border-left: 2px solid var(--c-gold);
}

.page-about .ab-partner-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .ab-partner-item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--c-gray);
}

/* ========== 收尾 CTA ========== */
.page-about .ab-outro {
  position: relative;
  padding: 64px 20px 72px;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(230, 57, 43, .16) 0%, transparent 46%),
    radial-gradient(ellipse at 50% 10%, rgba(232, 183, 74, .1) 0%, transparent 40%),
    var(--c-bg);
  border-top: 1px solid rgba(230, 57, 43, .22);
}

.page-about .ab-outro-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.page-about .ab-outro-kicker {
  margin: 0 0 12px;
  font-size: .76rem;
  letter-spacing: .16em;
  color: var(--c-gold);
}

.page-about .ab-outro-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.8rem, 4.4vw, 2.9rem);
  line-height: 1.1;
  color: var(--c-white);
}

.page-about .ab-outro-lead {
  margin: 0;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--c-gray);
}

.page-about .ab-outro-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-outro-links .btn {
  font-size: .86rem;
}

/* ========== 桌面端布局 ========== */
@media (min-width: 900px) {
  .page-about .ab-cover {
    padding: 36px var(--content-pad-desktop) 48px;
  }

  .page-about .ab-cover-body {
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    gap: 48px;
    align-items: center;
    padding-top: 40px;
  }

  .page-about .ab-cover-text {
    padding-bottom: 10px;
  }

  .page-about .ab-cover-visual {
    align-self: stretch;
    min-height: 420px;
  }

  .page-about .ab-cover-img {
    height: 100%;
    aspect-ratio: auto;
  }

  .page-about .ab-section {
    padding: 60px var(--content-pad-desktop) 68px;
  }

  .page-about .ab-section-head {
    margin-bottom: 36px;
  }

  .page-about .ab-who-grid {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-who-statement {
    padding-top: 6px;
  }

  .page-about .ab-who-principles {
    gap: 14px;
  }

  .page-about .ab-data-grid {
    display: grid;
    grid-template-columns: .95fr 1.05fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .ab-data-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .page-about .ab-data-caption {
    max-width: 780px;
    padding-left: 18px;
  }

  .page-about .ab-history-inner {
    padding-left: 20px;
  }

  .page-about .ab-timeline-item {
    padding-left: 48px;
  }

  .page-about .ab-timeline::before {
    left: 13px;
  }

  .page-about .ab-timeline-item::before {
    left: 8px;
  }

  .page-about .ab-cert-grid {
    display: grid;
    grid-template-columns: 1.15fr .85fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-cert-visual {
    margin-top: 8px;
    max-width: 100%;
  }

  .page-about .ab-team-grid {
    display: grid;
    grid-template-columns: .7fr 1.3fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .ab-team-flow {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }

  .page-about .ab-flow-node {
    flex: 1;
    grid-template-columns: 64px 1fr;
    padding: 16px 14px;
  }

  .page-about .ab-flow-arrow {
    flex: 0 0 auto;
    font-size: 1.5rem;
    transform: none;
  }

  .page-about .ab-team-values {
    grid-column: 1 / -1;
    justify-content: center;
  }

  .page-about .ab-partners-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about .ab-partner-item {
    padding-left: 22px;
  }

  .page-about .ab-outro {
    padding: 76px var(--content-pad-desktop) 84px;
  }
}

@media (min-width: 1240px) {
  .page-about .ab-cover-body {
    gap: 64px;
  }

  .page-about .ab-who-grid {
    gap: 80px;
  }

  .page-about .ab-data-grid {
    gap: 60px;
  }

  .page-about .ab-cert-grid {
    gap: 64px;
  }
}