.as-techstack {
    --as-tech-navy: #203f67;
    --as-tech-navy-dark: #172f4e;
    --as-tech-teal: #0799a5;
    --as-tech-title: #182334;
    --as-tech-body: #64717e;
    --as-tech-muted: #83909c;
    --as-tech-background: #f5f8fa;
    --as-tech-card: #ffffff;
    --as-tech-border: #e1e8ed;
    --as-tech-shadow: rgba(26, 51, 79, 0.08);

    width: 100%;
    padding: 46px 24px 42px;
    overflow: hidden;
    background: var(--as-tech-background);
    box-sizing: border-box;
  }

  .as-techstack,
  .as-techstack * {
    box-sizing: border-box;
  }

  .as-techstack__container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
  }

  /* ==========================
  标题区域
  ========================== */

  .as-techstack__header {
    display: grid;
    grid-template-columns:
      minmax(300px, 0.78fr)
      minmax(420px, 1.22fr);
    gap: 54px;
    align-items: end;
    margin-bottom: 28px;
  }

  .as-techstack__title {
    margin: 0;
    color: var(--as-tech-title);
    font-size: clamp(31px, 3.2vw, 42px);
    font-weight: 730;
    line-height: 1.15;
    letter-spacing: -0.025em;
  }

  .as-techstack__description {
    max-width: 680px;
    margin: 0;
    color: var(--as-tech-body);
    font-size: 14px;
    line-height: 1.7;
  }

  /* ==========================
  分组区域
  ========================== */

  .as-techstack__group {
    display: grid;
    grid-template-columns:
      minmax(205px, 0.25fr)
      minmax(0, 0.75fr);
    gap: 30px;
    align-items: center;
    padding: 18px 0;
    border-top: 1px solid var(--as-tech-border);
  }

  .as-techstack__group:last-of-type {
    border-bottom: 1px solid var(--as-tech-border);
  }

  .as-techstack__group-heading {
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr);
    gap: 13px;
    align-items: start;
  }

  .as-techstack__group-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 3px;
    color: #ffffff;
    background: var(--as-tech-navy);
    font-size: 11px;
    font-weight: 800;
    line-height: 1;
  }

  .as-techstack__group-heading h3 {
    margin: 0;
    color: var(--as-tech-title);
    font-size: 16px;
    font-weight: 720;
    line-height: 1.4;
  }

  .as-techstack__group-heading p {
    max-width: 210px;
    margin: 4px 0 0;
    color: var(--as-tech-muted);
    font-size: 11px;
    line-height: 1.5;
  }

  /* ==========================
  Logo网格
  ========================== */

  .as-techstack__logo-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .as-techstack__logo-card {
    min-width: 0;
    min-height: 92px;
    padding: 11px 12px 9px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--as-tech-border);
    background: var(--as-tech-card);
    box-shadow: 0 5px 16px var(--as-tech-shadow);
    transition:
      transform 0.2s ease,
      border-color 0.2s ease,
      box-shadow 0.2s ease;
  }

  .as-techstack__logo-card:hover {
    border-color: rgba(7, 153, 165, 0.42);
    transform: translateY(-2px);
    box-shadow: 0 9px 22px rgba(26, 51, 79, 0.11);
  }

  .as-techstack__logo-frame {
    width: 100%;
    height: 51px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .as-techstack__logo-frame img {
    display: block;
    width: auto;
    max-width: 88%;
    height: auto;
    max-height: 49px;
    object-fit: contain;
    object-position: center;
  }

  .as-techstack__logo-name {
    display: block;
    width: 100%;
    margin-top: 6px;
    overflow: hidden;
    color: var(--as-tech-navy);
    font-size: 11px;
    font-weight: 700;
    line-height: 1.35;
    text-align: center;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  /* ==========================
  底部说明
  ========================== */

  .as-techstack__note {
    max-width: 900px;
    margin: 17px auto 0;
    color: var(--as-tech-muted);
    font-size: 11px;
    line-height: 1.55;
    text-align: center;
  }

  /* ==========================
  中等屏幕
  ========================== */

  @media (max-width: 980px) {
    .as-techstack {
      padding: 42px 22px 39px;
    }

    .as-techstack__header {
      grid-template-columns: 1fr;
      gap: 12px;
      margin-bottom: 24px;
    }

    .as-techstack__description {
      max-width: 720px;
    }

    .as-techstack__group {
      grid-template-columns: 1fr;
      gap: 15px;
    }

    .as-techstack__group-heading p {
      max-width: 520px;
    }
  }

  /* ==========================
  手机端
  ========================== */

  @media (max-width: 640px) {
    .as-techstack {
      padding: 36px 16px 34px;
    }

    .as-techstack__title {
      font-size: 30px;
      line-height: 1.18;
    }

    .as-techstack__description {
      font-size: 13px;
      line-height: 1.65;
    }

    .as-techstack__group {
      padding: 17px 0;
    }

    .as-techstack__group-heading {
      grid-template-columns: 34px minmax(0, 1fr);
      gap: 11px;
    }

    .as-techstack__group-number {
      width: 32px;
      height: 32px;
    }

    .as-techstack__logo-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 9px;
    }

    .as-techstack__logo-card {
      min-height: 88px;
      padding: 10px 8px 8px;
    }

    .as-techstack__logo-frame {
      height: 48px;
    }

    .as-techstack__logo-frame img {
      max-width: 86%;
      max-height: 46px;
    }

    .as-techstack__logo-name {
      font-size: 10px;
      white-space: normal;
    }

    .as-techstack__note {
      margin-top: 15px;
      text-align: left;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .as-techstack__logo-card {
      transition: none;
    }
  }