.page-about {
  **--about-section-pad: clamp(56px, 10vw, 120px);
  --about-narrow-w: minmax(0, 3fr);
  --about-wide-w: minmax(0, 9fr);
  --about-milestone-line: rgba(212, 168, 75, 0.35);
  --about-milestone-marker: #D4A84B;
  --about-grid-gap: clamp(24px, 4vw, 56px);

  background: #070B14;
  color: #F3EFE6;
  overflow-x: hidden;

  .container {
    width: 100%;
    max-width: min(1440px, calc(100% - clamp(20px, 4vw, 48px) * 2));
    margin-inline: auto;
  }

  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-block: 28px 0;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-size: 0.75rem;
    color: #A7C6FF;

    a {
      color: #A7C6FF;
      text-decoration: none;
      transition: color 0.2s ease;

      &:hover {
        color: #F0CC78;
      }
    }
  }

  .breadcrumb-sep {
    color: rgba(167, 198, 255, 0.5);
  }

  .breadcrumb-current {
    color: #D4A84B;
  }

  /* ============ HERO ============ */
  .about-hero {
    padding-block: clamp(40px, 8vw, 88px) clamp(56px, 10vw, 120px);
  }

  .about-hero-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
  }

  .about-hero-main {
    position: relative;
  }

  .section-num {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 0 0 24px;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-size: clamp(0.7rem, 1.2vw, 0.85rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #D4A84B;

    span:first-child {
      font-weight: 700;
    }
  }

  .section-num-line {
    width: 48px;
    height: 1px;
    background: linear-gradient(90deg, #D4A84B, rgba(212, 168, 75, 0));
  }

  .page-title {
    margin: 0 0 28px;
    font-family: 'Archivo Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    font-weight: 900;
    font-size: clamp(2.5rem, 6vw, 5rem);
    line-height: 0.95;
    letter-spacing: -0.02em;

    span {
      display: block;
      margin-top: 0.35em;
      font-size: 0.42em;
      line-height: 1.1;
      color: #D4A84B;
    }
  }

  .lede {
    max-width: 640px;
    margin: 0 0 36px;
    font-size: clamp(1rem, 1.6vw, 1.25rem);
    line-height: 1.75;
    color: #A7C6FF;
  }

  .about-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-decoration: none;
    border-radius: 2px;
    transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
    cursor: pointer;

    &:hover {
      transform: translateY(-2px);
    }
  }

  .btn-gold {
    background: #D4A84B;
    color: #070B14;
    border: 1px solid #D4A84B;

    &:hover {
      background: #F0CC78;
      border-color: #F0CC78;
    }
  }

  .btn-outline {
    background: transparent;
    color: #D4A84B;
    border: 1px solid rgba(212, 168, 75, 0.5);

    &:hover {
      border-color: #F0CC78;
      color: #F0CC78;
    }
  }

  .about-hero-visual {
    position: relative;

    img {
      width: 100%;
      height: auto;
      max-height: 420px;
      object-fit: cover;
      border-radius: 2px;
      border: 1px solid rgba(212, 168, 75, 0.25);
    }
  }

  .hero-caption {
    position: absolute;
    inset-inline-end: 16px;
    inset-block-end: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: rgba(7, 11, 20, 0.8);
    border-left: 2px solid #D4A84B;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-size: 0.75rem;
    color: #F3EFE6;
    backdrop-filter: blur(4px);
  }

  .hero-caption-num {
    color: #D4A84B;
    font-weight: 700;
    letter-spacing: 0.1em;
  }

  .hero-caption-text {
    color: #A7C6FF;
    letter-spacing: 0.06em;
  }

  /* ============ SECTION GRID ============ */
  .about-section {
    padding-block: var(--about-section-pad);
    border-top: 1px solid rgba(212, 168, 75, 0.15);
  }

  .about-section-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-section-narrow {
    .about-narrow-note {
      margin: 16px 0 0;
      font-size: 0.9rem;
      line-height: 1.7;
      color: #A7C6FF;
      opacity: 0.85;
    }
  }

  .about-section-wide {
    min-width: 0;
  }

  /* ============ MILESTONES ============ */
  .milestone-frame {
    margin-bottom: 48px;

    img {
      width: 100%;
      height: auto;
      max-height: 320px;
      object-fit: cover;
      border-radius: 2px;
      border: 1px solid rgba(212, 168, 75, 0.2);
    }
  }

  .milestone-list {
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;

    &::before {
      content: '';
      position: absolute;
      inset-block: 0;
      inset-inline-start: 15px;
      width: 2px;
      background: linear-gradient(180deg, #D4A84B 0%, rgba(212, 168, 75, 0.1) 100%);
    }
  }

  .milestone-item {
    position: relative;
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 16px;
    padding-block: 12px;

    &:last-child {
      padding-bottom: 0;
    }
  }

  .milestone-year {
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-size: 0.95rem;
    font-weight: 700;
    color: #F0CC78;
    text-align: right;
    padding-top: 4px;
  }

  .milestone-marker {
    position: absolute;
    inset-inline-start: 10px;
    inset-block-start: 20px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #070B14;
    border: 3px solid #D4A84B;
    box-shadow: 0 0 0 4px rgba(212, 168, 75, 0.15);
  }

  .milestone-content {
    padding-inline-start: 24px;

    h3 {
      margin: 0 0 6px;
      font-family: 'Archivo Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      font-size: 1.15rem;
      color: #F3EFE6;
    }

    p {
      margin: 0;
      font-size: 0.9rem;
      line-height: 1.7;
      color: #A7C6FF;
    }
  }

  /* ============ CAPABILITY GRID ============ */
  .capability-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 48px;
  }

  .card {
    position: relative;
    background: #0E1726;
    border: 1px solid rgba(167, 198, 255, 0.12);
    border-radius: 2px;
    padding: clamp(20px, 3vw, 32px);
    transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;

    &:hover {
      border-color: rgba(212, 168, 75, 0.6);
      transform: translateY(-3px);
      box-shadow: 0 10px 30px rgba(212, 168, 75, 0.08);
    }
  }

  .card--dark {
    background: #0E1726;
  }

  .data-num {
    margin: 0 0 8px;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1;
    color: #D4A84B;
  }

  .card h3 {
    margin: 0 0 10px;
    font-family: 'Archivo Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    font-size: 1rem;
    letter-spacing: 0.02em;
    color: #F0CC78;
  }

  .card-text {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #A7C6FF;
  }

  .radar-wrap {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: center;

    img {
      width: 100%;
      height: auto;
      max-width: 420px;
      justify-self: center;
      border-radius: 2px;
    }
  }

  .radar-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
  }

  .radar-legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: #A7C6FF;
  }

  .legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
  }

  .legend-dot--gold {
    background: #D4A84B;
  }

  .legend-dot--blue {
    background: #4A9FFF;
  }

  .legend-dot--purple {
    background: #8F5BFF;
  }

  /* ============ CERTIFICATION ============ */
  .cert-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .cert-card {
    background: #0E1726;
    border: 1px solid rgba(212, 168, 75, 0.2);
    border-radius: 2px;
    padding: clamp(20px, 3vw, 28px);
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: border-color 0.25s ease, transform 0.25s ease;

    &:hover {
      border-color: #D4A84B;
      transform: translateY(-3px);
    }
  }

  .cert-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #D4A84B, #F0CC78);
    color: #070B14;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
    font-weight: 700;
    font-size: 0.8rem;
    border-radius: 2px;
    letter-spacing: 0.04em;
  }

  .cert-card h3 {
    margin: 0;
    font-family: 'Archivo Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    font-size: 1rem;
    color: #F3EFE6;
  }

  .cert-card p {
    margin: 0;
    font-size: 0.88rem;
    line-height: 1.6;
    color: #A7C6FF;
    font-family: 'JetBrains Mono', 'Noto Sans SC', monospace;
  }

  /* ============ ECOSYSTEM ============ */
  .eco-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 40px;
  }

  .eco-block {
    background: #0E1726;
    border-left: 3px solid #D4A84B;
    border-radius: 2px;
    padding: clamp(20px, 3vw, 28px);

    h3 {
      margin: 0 0 10px;
      font-family: 'Archivo Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      font-size: 1rem;
      color: #F0CC78;
    }

    p {
      margin: 0;
      font-size: 0.9rem;
      line-height: 1.7;
      color: #A7C6FF;
    }
  }

  .about-cta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    padding: 28px;
    background: linear-gradient(135deg, #0E1726, rgba(14, 23, 38, 0.6));
    border: 1px solid rgba(212, 168, 75, 0.2);
    border-radius: 2px;

    p {
      flex-basis: 100%;
      margin: 0;
      font-family: 'Archivo Black', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      font-size: 1rem;
      color: #F3EFE6;
    }

    .btn {
      padding: 10px 18px;
      font-size: 0.75rem;
    }
  }

  /* ============ MEDIA ============ */
  @media (min-width: 720px) {
    .capability-grid {
      grid-template-columns: repeat(2, 1fr);
    }

    .cert-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 960px) {
    .about-hero-inner {
      grid-template-columns: 5fr 4fr;
    }

    .about-section-grid {
      grid-template-columns: var(--about-narrow-w) var(--about-wide-w);
      gap: var(--about-grid-gap);
    }

    .milestone-list {
      &::before {
        inset-inline-start: 15px;
      }
    }

    .milestone-item {
      grid-template-columns: 56px 1fr;
    }

    .radar-wrap {
      grid-template-columns: 1fr;
      padding: 24px 0 0 24px;
    }

    .cert-grid {
      grid-template-columns: repeat(3, 1fr);
    }

    .eco-layout {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  @media (min-width: 1200px) {
    .capability-grid {
      grid-template-columns: repeat(3, 1fr);

      .card:nth-child(1) {
        grid-column: span 2;
      }

      .card:nth-child(4) {
        grid-column: span 2;
      }
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .btn,
    .card,
    .cert-card {
      transition: none;
    }
  }
}