.page-about {
  --ab-navy: #0B1D3A;
  --ab-navy-2: #16325A;
  --ab-accent: #F28C28;
  --ab-accent-2: #E07F14;
  --ab-bg: #F2F4F8;
  --ab-ink: #1A1A2E;
  --ab-muted: #4A4A68;
  --ab-line: #D1D6E0;
  --ab-white: #FFFFFF;
  --ab-green: #00A676;
  --ab-red: #E63946;
  --ab-mono: 'Courier New', 'Roboto Mono', monospace;
  background: var(--ab-bg);
}

.page-about .breadcrumb {
  background: var(--ab-navy);
  color: rgba(255, 255, 255, 0.7);
  padding: 14px 20px;
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  margin: 0;
}

.page-about .breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 8px;
  max-width: 1200px;
}

.page-about .breadcrumb a {
  color: var(--ab-accent);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

.page-about .ab-hero {
  position: relative;
  background: var(--ab-navy);
  color: var(--ab-white);
  overflow: hidden;
}

.page-about .ab-hero__media {
  height: 200px;
  overflow: hidden;
}

.page-about .ab-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  display: block;
  filter: saturate(1.15);
}

.page-about .ab-hero__content {
  padding: 28px 20px 36px;
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .ab-hero__kicker {
  font-family: var(--ab-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ab-accent);
  margin: 0 0 14px;
  display: inline-block;
  padding: 6px 12px;
  background: rgba(242, 140, 40, 0.12);
  border-left: 3px solid var(--ab-accent);
}

.page-about .ab-hero__title {
  font-family: 'Arial Black', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0 0 16px;
}

.page-about .ab-hero__desc {
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  max-width: 680px;
  margin: 0;
}

.page-about .ab-origin {
  padding: 48px 20px;
  background: var(--ab-bg);
}

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

.page-about .ab-origin__body .section-head {
  margin-bottom: 22px;
}

.page-about .ab-origin__lead {
  font-size: 17px;
  font-weight: 600;
  color: var(--ab-navy);
  line-height: 1.8;
  margin: 0 0 16px;
}

.page-about .ab-origin__body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-ink);
  margin: 0 0 16px;
}

.page-about .ab-origin__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px dashed var(--ab-line);
}

.page-about .ab-origin__list li {
  padding: 12px 0 12px 20px;
  border-bottom: 1px dashed var(--ab-line);
  font-family: var(--ab-mono);
  font-size: 13px;
  color: var(--ab-muted);
  position: relative;
  line-height: 1.6;
}

.page-about .ab-origin__list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 18px;
  width: 6px;
  height: 6px;
  background: var(--ab-accent);
  transform: rotate(45deg);
}

.page-about .ab-origin__aside {
  margin-top: 32px;
  background: var(--ab-navy);
  color: var(--ab-white);
  padding: 24px;
  transform: rotate(-0.4deg);
  box-shadow: 8px 8px 0 rgba(11, 29, 58, 0.16);
}

.page-about .ab-origin__code-head {
  display: flex;
  justify-content: space-between;
  font-family: var(--ab-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.page-about .ab-origin__code {
  font-family: var(--ab-mono);
  font-size: 12px;
  line-height: 1.95;
  color: #cfe1ff;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.page-about .ab-origin__note {
  margin-top: 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

.page-about .ab-milestone {
  background: var(--ab-navy);
  color: var(--ab-white);
  padding: 56px 0;
  position: relative;
}

.page-about .ab-milestone::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 34%;
  height: 6px;
  background: var(--ab-accent);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 24px 100%);
}

.page-about .ab-milestone .section-head {
  padding: 0 20px;
}

.page-about .ab-milestone .section-head__title {
  color: var(--ab-white);
}

.page-about .ab-milestone .section-head__desc {
  color: rgba(255, 255, 255, 0.72);
}

.page-about .ab-milestone .section-head__kicker {
  color: var(--ab-accent);
}

.page-about .ab-timeline {
  position: relative;
  margin-top: 40px;
  padding: 0 20px 0 48px;
}

.page-about .ab-timeline__line {
  position: absolute;
  left: 12px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--ab-accent), rgba(242, 140, 40, 0.12));
}

.page-about .ab-timeline__item {
  position: relative;
  margin-bottom: 20px;
}

.page-about .ab-timeline__item::before {
  content: '';
  position: absolute;
  left: -40px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ab-accent);
  border: 2px solid var(--ab-navy);
  box-shadow: 0 0 0 2px rgba(242, 140, 40, 0.4);
  z-index: 2;
}

.page-about .ab-timeline__head {
  list-style: none;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 14px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.14);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-timeline__head::-webkit-details-marker {
  display: none;
}

.page-about .ab-timeline__head:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(242, 140, 40, 0.5);
}

.page-about .ab-timeline__item[open] .ab-timeline__head {
  border-color: rgba(242, 140, 40, 0.65);
  background: rgba(242, 140, 40, 0.08);
}

.page-about .ab-timeline__year {
  font-family: var(--ab-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--ab-accent);
  line-height: 1;
  min-width: 56px;
}

.page-about .ab-timeline__tag {
  font-size: 12px;
  line-height: 1;
  margin: 0;
  border-radius: 0;
}

.page-about .ab-timeline__brief {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.92);
  flex: 1;
  min-width: 160px;
}

.page-about .ab-timeline__arrow {
  font-family: var(--ab-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--ab-accent);
  transition: transform 0.25s ease;
  align-self: center;
}

.page-about .ab-timeline__item[open] .ab-timeline__arrow {
  transform: rotate(45deg);
}

.page-about .ab-timeline__body {
  padding: 16px 16px 20px;
  border-left: 2px solid rgba(242, 140, 40, 0.38);
  margin: 0 0 0 16px;
  background: rgba(11, 29, 58, 0.55);
}

.page-about .ab-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .ab-milestone__media {
  margin: 28px 0;
  padding-left: 48px;
  border-left: 3px solid var(--ab-accent);
  border-left-color: var(--ab-accent);
}

.page-about .ab-milestone__media img {
  width: 100%;
  max-width: 640px;
  height: auto;
  display: block;
  box-shadow: 10px 10px 0 rgba(242, 140, 40, 0.18);
}

.page-about .ab-milestone__media figcaption {
  font-family: var(--ab-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
  margin-top: 10px;
}

.page-about .ab-principles {
  background: var(--ab-bg);
  padding: 56px 20px;
}

.page-about .ab-principles__inner {
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .ab-principles__grid {
  display: grid;
  gap: 22px;
  margin-top: 32px;
}

.page-about .ab-principle {
  padding: 32px 26px;
  background: var(--ab-white);
  border: 1px solid var(--ab-line);
  box-shadow: 4px 4px 0 var(--ab-line);
  position: relative;
}

.page-about .ab-principle--line {
  border-top: 5px solid var(--ab-accent);
}

.page-about .ab-principle--dark {
  background: var(--ab-navy);
  color: var(--ab-white);
  border-color: var(--ab-navy);
  box-shadow: 4px 4px 0 var(--ab-navy-2);
}

.page-about .ab-principle--accent {
  background: var(--ab-accent);
  color: var(--ab-navy);
  border-color: var(--ab-accent);
  box-shadow: 4px 4px 0 #d1d6e0;
}

.page-about .ab-principle__idx {
  font-family: var(--ab-mono);
  font-size: 46px;
  line-height: 1;
  display: block;
  margin-bottom: 14px;
  color: var(--ab-accent);
}

.page-about .ab-principle--dark .ab-principle__idx {
  color: var(--ab-accent);
}

.page-about .ab-principle--accent .ab-principle__idx {
  color: var(--ab-navy);
}

.page-about .ab-principle h3 {
  font-size: 20px;
  margin: 0 0 12px;
  font-family: 'Arial Black', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  letter-spacing: 0.02em;
}

.page-about .ab-principle p {
  font-size: 14px;
  line-height: 1.85;
  margin: 0;
  color: var(--ab-muted);
}

.page-about .ab-principle--dark p {
  color: rgba(255, 255, 255, 0.82);
}

.page-about .ab-principle--accent p {
  color: var(--ab-navy);
  opacity: 0.88;
}

.page-about .ab-numbers {
  background: linear-gradient(135deg, var(--ab-navy) 0%, var(--ab-navy-2) 100%);
  color: var(--ab-white);
  padding: 56px 20px;
  position: relative;
  overflow: hidden;
}

.page-about .ab-numbers::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -60px;
  width: 240px;
  height: 240px;
  background: rgba(242, 140, 40, 0.1);
  transform: rotate(12deg);
  border: 2px solid rgba(242, 140, 40, 0.25);
}

.page-about .ab-numbers__inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  z-index: 1;
}

.page-about .ab-numbers__kicker {
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ab-accent);
  margin: 0 0 28px;
}

.page-about .ab-numbers__grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-numbers__item {
  padding: 28px 20px;
  border-top: 3px solid var(--ab-accent);
  background: rgba(255, 255, 255, 0.05);
}

.page-about .ab-numbers__num {
  display: block;
  font-family: 'Arial Black', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  font-size: 44px;
  line-height: 1.1;
  color: var(--ab-white);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.page-about .ab-numbers__label {
  font-family: var(--ab-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.72);
  letter-spacing: 0.08em;
}

.page-about .ab-team {
  background: var(--ab-bg);
  padding: 56px 20px;
}

.page-about .ab-team__grid {
  display: grid;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .ab-team__content .section-head {
  margin-bottom: 24px;
}

.page-about .ab-team__roles {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-team__role {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 18px 16px;
  background: var(--ab-white);
  border-left: 4px solid var(--ab-navy);
  box-shadow: 3px 3px 0 var(--ab-line);
}

.page-about .ab-team__role:nth-child(even) {
  border-left-color: var(--ab-accent);
}

.page-about .ab-team__role-num {
  font-family: var(--ab-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ab-accent);
  padding-top: 3px;
}

.page-about .ab-team__role-body h3 {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ab-navy);
}

.page-about .ab-team__role-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ab-muted);
  margin: 0;
}

.page-about .ab-team__media {
  margin: 0;
  align-self: center;
}

.page-about .ab-team__media img {
  width: 100%;
  max-width: 640px;
  height: auto;
  display: block;
  object-fit: cover;
  box-shadow: 10px 10px 0 rgba(11, 29, 58, 0.14);
}

.page-about .ab-team__media figcaption {
  font-family: var(--ab-mono);
  font-size: 12px;
  color: var(--ab-muted);
  margin-top: 12px;
}

.page-about .ab-accreditation {
  background: var(--ab-white);
  padding: 56px 20px;
}

.page-about .ab-accreditation__inner {
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .ab-accreditation__grid {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about .ab-accreditation__card {
  padding: 28px 24px;
  border: 2px solid var(--ab-line);
  border-top: 6px solid var(--ab-navy);
  background: var(--ab-bg);
}

.page-about .ab-accreditation__card:nth-child(2) {
  border-top-color: var(--ab-accent);
}

.page-about .ab-accreditation__label {
  display: block;
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ab-muted);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.page-about .ab-accreditation__value {
  display: block;
  font-family: 'Arial Black', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  font-size: 24px;
  color: var(--ab-navy);
  margin-bottom: 10px;
  line-height: 1.3;
}

.page-about .ab-accreditation__card p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ab-muted);
  margin: 0;
}

.page-about .ab-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 56px;
  background: var(--ab-bg);
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-links__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 16px;
  background: var(--ab-navy);
  color: var(--ab-white);
  text-decoration: none;
  font-size: 14px;
  border-left: 4px solid var(--ab-accent);
  transition: transform 0.15s ease, background 0.15s ease;
}

.page-about .ab-links__item:hover {
  transform: translateX(4px);
  background: var(--ab-navy-2);
}

.page-about .ab-links__idx {
  font-family: var(--ab-mono);
  font-size: 12px;
  color: var(--ab-accent);
}

@media (min-width: 768px) {
  .page-about .breadcrumb {
    padding: 16px 40px;
  }

  .page-about .ab-hero__media {
    position: absolute;
    inset: 0;
    height: 100%;
  }

  .page-about .ab-hero__media img {
    object-position: center 32%;
  }

  .page-about .ab-hero__content {
    padding: 88px 40px;
    max-width: 1240px;
  }

  .page-about .ab-hero__title {
    font-size: 44px;
  }

  .page-about .ab-hero__desc {
    font-size: 16px;
    max-width: 640px;
  }

  .page-about .ab-origin {
    display: grid;
    grid-template-columns: 7fr 4fr;
    gap: 56px;
    align-items: start;
    padding: 80px 40px;
    max-width: 1280px;
    margin: 0 auto;
  }

  .page-about .ab-origin__body {
    max-width: none;
  }

  .page-about .ab-origin__aside {
    margin-top: 8px;
    position: sticky;
    top: 28px;
  }

  .page-about .ab-milestone {
    padding: 88px 0;
  }

  .page-about .ab-milestone .container {
    padding: 0 40px;
  }

  .page-about .ab-milestone .section-head {
    padding: 0;
  }

  .page-about .ab-timeline {
    padding: 0 0 0 80px;
    margin-top: 48px;
  }

  .page-about .ab-timeline__line {
    left: 24px;
  }

  .page-about .ab-timeline__item::before {
    left: -61px;
    top: 28px;
    width: 12px;
    height: 12px;
  }

  .page-about .ab-timeline__year {
    font-size: 34px;
    min-width: 64px;
  }

  .page-about .ab-timeline__head {
    padding: 18px 22px;
    gap: 8px 18px;
  }

  .page-about .ab-timeline__brief {
    font-size: 15px;
    min-width: 200px;
  }

  .page-about .ab-timeline__body {
    margin-left: 24px;
  }

  .page-about .ab-milestone__media {
    margin: 36px 0;
    padding-left: 80px;
  }

  .page-about .ab-milestone__media img {
    max-width: 720px;
  }

  .page-about .ab-principles {
    padding: 88px 40px;
  }

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

  .page-about .ab-principle--dark {
    transform: translateY(-14px);
  }

  .page-about .ab-numbers {
    padding: 80px 40px;
  }

  .page-about .ab-numbers__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .ab-numbers__item {
    padding: 36px 24px;
  }

  .page-about .ab-numbers__num {
    font-size: 52px;
  }

  .page-about .ab-team {
    padding: 88px 40px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: 6fr 5fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .ab-team__media img {
    max-width: 100%;
  }

  .page-about .ab-accreditation {
    padding: 88px 40px;
  }

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

  .page-about .ab-links {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding: 64px 40px 72px;
  }
}