/* ===== 全局样式（保持不变，仅微调部分视觉） ===== */
    :root {
      --bg-body: #000000;
      --bg-surface: #0d0d0d;
      --bg-card: #131313;
      --bg-card-hover: #1a1a1a;
      --bg-elevated: #1e1e1e;
      --border-subtle: rgba(255, 255, 255, 0.06);
      --border-glow: rgba(56, 189, 248, 0.15);
      --text-primary: #ffffff;
      --text-secondary: #b0b8c8;
      --text-muted: #7a8296;
      --accent-blue: #38bdf8;
      --accent-gold: #e8a838;
      --accent-purple: #a78bfa;
      --gradient-brand: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.6);
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      background-color: #000000;
      font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
      color: #ffffff;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }

    ::-webkit-scrollbar {
      width: 6px;
    }

    ::-webkit-scrollbar-track {
      background: #0a0a0a;
    }

    ::-webkit-scrollbar-thumb {
      background: #2c2c3a;
      border-radius: 6px;
    }

    ::-webkit-scrollbar-thumb:hover {
      background: #4a4a6a;
    }

    /* --- 导航栏 --- */
    .navbar {
      background: rgba(6, 6, 14, 1);
      -webkit-backdrop-filter: blur(32px) saturate(1.5);
      backdrop-filter: blur(32px) saturate(1.5);
      padding: 0.9rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.03);
      box-shadow:
        0 4px 40px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.02);
      transition: all 0.4s ease;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1050;
    }

    .navbar.scrolled {
      background: rgba(4, 4, 12, 0.75);
      -webkit-backdrop-filter: blur(40px) saturate(1.6);
      backdrop-filter: blur(40px) saturate(1.6);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      box-shadow:
        0 8px 60px rgba(0, 0, 0, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.03);
    }

    .navbar-brand {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
      color: #ffffff !important;
      text-decoration: none;
      position: relative;
      padding: 0.2rem 0;
    }

    .navbar-brand img {
      height: 50px;
      width: auto;
      filter: drop-shadow(0 0 16px rgba(100, 160, 255, 0.12));
      transition: filter 0.4s ease;
    }

    .navbar-brand:hover img {
      filter: drop-shadow(0 0 30px rgba(100, 160, 255, 0.25));
    }

    .brand-text {
      font-weight: 600;
      font-size: 1.25rem;
      background: linear-gradient(135deg, #ffffff 20%, #8ab4ff 100%);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      letter-spacing: -0.02em;
    }

    .navbar-nav {
      gap: 0.15rem;
      align-items: center;
    }

    .nav-item {
      position: relative;
    }

    .navbar-nav .nav-link {
      font-weight: 700;
      font-size: 1.1rem;
      padding: 0.55rem 1.2rem;
      color: rgb(255, 255, 255) !important;
      border-radius: 40px;
      transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      position: relative;
      letter-spacing: 0.01em;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      white-space: nowrap;
    }

    .navbar-nav .nav-link i {
      font-size: 0.9rem;
      opacity: 0.5;
      transition: opacity 0.3s ease;
    }

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: #ffffff !important;
      background: rgba(255, 255, 255, 0.05);
      box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.05),
        0 0 24px rgba(138, 180, 255, 0.04);
    }

    .navbar-nav .nav-link:hover i,
    .navbar-nav .nav-link.active i {
      opacity: 1;
    }

    .navbar-nav .nav-link::after {
      content: "";
      position: absolute;
      bottom: 4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 60%;
      height: 2px;
      border-radius: 4px;
      background: linear-gradient(90deg, #6a8cff, #a78bfa, #6a8cff);
      background-size: 200% 100%;
      transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
      transform-origin: center;
      opacity: 0.5;
    }

    .navbar-nav .nav-link:hover::after,
    .navbar-nav .nav-link.active::after {
      transform: translateX(-50%) scaleX(1);
      animation: shimmerLine 2s ease-in-out infinite;
    }

    @keyframes shimmerLine {

      0%,
      100% {
        background-position: 0% 50%;
      }

      50% {
        background-position: 100% 50%;
      }
    }

    .dropdown-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 0;
    }

    .dropdown-header .nav-link {
      flex: 1;
      margin: 0;
    }

    @media (min-width: 992px) {
      .navbar-nav {
        gap: 5rem;
      }

      .dropdown .dropdown-menu:not(.dropdown-menu-mega) {
        position: absolute;
        top: calc(100% + 0.5rem);
        left: 50%;
        transform: translateX(-50%) translateY(8px) scale(0.97);
        min-width: 260px;
        padding: 0.8rem 0.6rem;
        background: rgba(255, 255, 255, 0.97);
        -webkit-backdrop-filter: blur(24px) saturate(1.3);
        backdrop-filter: blur(24px) saturate(1.3);
        border: 1px solid rgba(0, 0, 0, 0.06);
        border-radius: 18px;
        box-shadow:
          0 20px 60px rgba(0, 0, 0, 0.35),
          inset 0 1px 0 rgba(255, 255, 255, 0.8);
        display: block !important;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform-origin: top center;
        transition:
          opacity 0.3s ease,
          transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
          visibility 0.3s;
        transition-delay: 0.25s, 0.25s, 0.25s;
      }

      .dropdown .dropdown-menu:not(.dropdown-menu-mega)::before {
        content: "";
        position: absolute;
        top: -16px;
        left: 0;
        width: 100%;
        height: 16px;
        background: transparent;
        pointer-events: auto;
      }

      .dropdown:hover .dropdown-menu:not(.dropdown-menu-mega) {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0) scale(1);
        pointer-events: auto;
      }

      .dropdown-menu:not(.dropdown-menu-mega) .dropdown-item {
        color: rgba(0, 0, 0, 0.8);
        font-weight: 600;
        font-size: 1rem;
        padding: 0.6rem 1.4rem;
        border-radius: 10px;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        gap: 0.6rem;
        background: transparent;
      }

      .dropdown-menu:not(.dropdown-menu-mega) .dropdown-item i {
        width: 1.4rem;
        text-align: center;
        font-size: 1.5rem;
        transition: color 0.2s;
      }

      .dropdown-menu:not(.dropdown-menu-mega) .dropdown-item:hover {
        background: rgba(0, 0, 0, 0.04);
        color: #000000;
      }

      .dropdown-divider {
        border-top: 1px solid rgba(0, 0, 0, 0.06);
        margin: 0.3rem 1rem;
      }

      @media (min-width: 992px) and (max-width: 1200px) {
        .navbar-nav {
          gap: clamp(0.5rem, 1.5vw, 2.5rem);
        }

        .navbar-nav .nav-link {
          font-size: 0.95rem;
          padding: 0.45rem 0.9rem;
        }

        .navbar-brand img {
          height: 42px;
        }

        .btn-outline-light-custom {
          padding: 0.4rem 1.1rem;
          font-size: 0.9rem;
        }

        .dropdown-menu-mega {
          transform: translateX(-50%) translateY(10px) scale(0.98) !important;
        }

        .dropdown:hover .dropdown-menu-mega {
          transform: translateX(-50%) translateY(0) scale(1) !important;
        }
      }

      .dropdown-menu-mega {
        position: absolute;
        top: calc(100% + 0.5rem);
        left: 50%;
        transform: translateX(-50%) translateY(10px) scale(0.98);
        width: 100vw;
        max-width: 1280px;
        padding: 2.8rem 3rem;
        background: rgba(255, 255, 255, 0.97);
        -webkit-backdrop-filter: blur(32px) saturate(1.5);
        backdrop-filter: blur(32px) saturate(1.5);
        border: 1px solid rgba(0, 0, 0, 0.06);
        border-radius: 30px;
        box-shadow:
          0 30px 80px rgba(0, 0, 0, 0.35),
          inset 0 1px 0 rgba(255, 255, 255, 0.8);
        display: grid !important;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 2.5rem;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition:
          opacity 0.4s ease,
          transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
          visibility 0.4s;
        transform-origin: top center;
        transition-delay: 0.25s, 0.25s, 0.25s;
      }

      .dropdown:hover .dropdown-menu-mega {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0) scale(1);
        pointer-events: auto;
        transition-delay: 0s, 0s, 0s;
      }

      .dropdown-menu-mega::before {
        content: "";
        position: absolute;
        top: -20px;
        left: 0;
        width: 100%;
        height: 20px;
        background: transparent;
        pointer-events: auto;
      }

      .dropdown-menu-mega {
        left: 50% !important;
        transform: translateX(-50%) translateY(10px) scale(0.98) !important;
      }

      .dropdown:hover .dropdown-menu-mega {
        transform: translateX(-50%) translateY(0) scale(1) !important;
      }

      @media (min-width: 992px) and (max-width: 1200px) {
        .dropdown-menu-mega {
          transform: translateX(calc(-50% + 115px)) translateY(10px) scale(0.98) !important;
        }

        .dropdown:hover .dropdown-menu-mega {
          transform: translateX(calc(-50% + 115px)) translateY(0) scale(1) !important;
        }
      }

      @media (min-width: 1200px) and (max-width: 1600px) {
        .dropdown-menu-mega {
          transform: translateX(calc(-50% + 160px)) translateY(10px) scale(0.98) !important;
        }

        .dropdown:hover .dropdown-menu-mega {
          transform: translateX(calc(-50% + 160px)) translateY(0) scale(1) !important;
        }
      }

      .mega-col {
        position: relative;
        overflow: hidden;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
        border-radius: 18px;
        padding: 0.8rem 0.6rem 0.8rem 0.6rem;
        transition: background 0.3s ease;
      }

      .mega-bg-icon {
        position: absolute;
        right: -10px;
        bottom: -10px;
        font-size: 160px;
        opacity: 0.1;
        color: #4a6aff;
        pointer-events: none;
        z-index: 0;
        line-height: 1;
        transform: rotate(-4deg);
        filter: drop-shadow(0 0 40px rgba(74, 106, 255, 0.08));
        transition:
          opacity 0.4s ease,
          transform 0.4s ease;
      }

      .mega-col:hover .mega-bg-icon {
        opacity: 0.5;
        transform: rotate(-10deg) scale(1.02);
      }

      .mega-col-title,
      .mega-col a {
        position: relative;
        z-index: 1;
      }

      .mega-col-title {
        font-weight: 700;
        font-size: 1.05rem;
        color: #1a1a2e;
        letter-spacing: 0.03em;
        margin-bottom: 0.6rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        padding-bottom: 0.6rem;
      }

      .mega-col-title i {
        color: #4a6aff;
        font-size: 0.95rem;
        opacity: 0.8;
      }

      .mega-col a {
        color: rgba(0, 0, 0, 0.7);
        text-decoration: none;
        font-weight: 600;
        font-size: 1rem;
        padding: 0.4rem 0.6rem;
        border-radius: 8px;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        gap: 0.4rem;
      }

      .mega-col a:hover {
        color: #000000;
        background: rgba(0, 0, 0, 0.04);
        padding-left: 0.6rem;
      }

      .mega-col a i {
        font-size: 0.7rem;
        opacity: 0.3;
        transition: opacity 0.2s;
        color: #4a6aff;
      }

      .mega-col a:hover i {
        opacity: 0.8;
      }

      .dropdown-arrow-btn {
        display: none !important;
      }
    }

    @media (max-width: 992px) {
      .navbar-collapse {
        max-height: calc(100vh - 80px);
        overflow-y: auto;
        padding: 0.5rem 0 1.5rem;
        background: transparent;
      }

      .navbar-collapse::-webkit-scrollbar {
        width: 3px;
      }

      .navbar-collapse::-webkit-scrollbar-track {
        background: transparent;
      }

      .navbar-collapse::-webkit-scrollbar-thumb {
        background: rgba(138, 180, 255, 0.2);
        border-radius: 6px;
      }

      .navbar-nav .nav-link {
        padding: 0.6rem 1rem;
        font-size: 1.05rem;
        border-radius: 12px;
        color: rgba(255, 255, 255, 0.85) !important;
      }

      .navbar-nav .nav-link:hover {
        background: rgba(255, 255, 255, 0.04);
        color: #ffffff !important;
      }

      .navbar-nav .nav-link::after {
        display: none !important;
      }

      .dropdown .dropdown-menu:not(.dropdown-menu-mega) {
        position: static;
        float: none;
        background: rgba(255, 255, 255, 0.97);
        -webkit-backdrop-filter: blur(8px);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(0, 0, 0, 0.06);
        border-radius: 14px;
        margin: 0.2rem 0 0.4rem 0.8rem;
        padding: 0.4rem 0.2rem;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
        display: none;
      }

      .dropdown .dropdown-menu.show {
        display: block;
      }

      .dropdown-menu .dropdown-item {
        color: rgba(0, 0, 0, 0.8);
        font-weight: 600;
        font-size: 1rem;
        padding: 0.5rem 1.2rem;
        border-radius: 8px;
        transition: 0.15s;
        display: flex;
        align-items: center;
        gap: 0.6rem;
      }

      .dropdown-menu .dropdown-item:hover {
        background: rgba(0, 0, 0, 0.04);
        color: #000000;
      }

      .dropdown-menu .dropdown-item i {
        width: 1.4rem;
        text-align: center;
        font-size: 1.5rem;
        color: rgba(0, 0, 0, 0.25);
      }

      .dropdown-menu-mega {
        display: none !important;
        flex-direction: column !important;
        min-width: auto !important;
        padding: 0.6rem 0.4rem !important;
        background: rgba(255, 255, 255, 0.97) !important;
        -webkit-backdrop-filter: blur(8px) !important;
        backdrop-filter: blur(8px) !important;
        border: 1px solid rgba(0, 0, 0, 0.06) !important;
        border-radius: 14px !important;
        margin: 0.2rem 0 0.4rem 0.8rem;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15) !important;
        gap: 0.25rem;
      }

      .dropdown-menu-mega.show {
        display: block !important;
      }

      .dropdown-menu-mega .mega-col {
        margin-bottom: 0.5rem;
        position: relative;
        overflow: hidden;
        border-radius: 12px;
        padding: 0.4rem 0.4rem 0.4rem 0.4rem;
      }

      .dropdown-menu-mega .mega-bg-icon {
        position: absolute;
        right: 0px;
        bottom: 0px;
        font-size: 72px;
        opacity: 0.045;
        color: #4a6aff;
        pointer-events: none;
        z-index: 0;
        line-height: 1;
        transform: rotate(-2deg);
      }

      .dropdown-menu-mega .mega-col-title,
      .dropdown-menu-mega .mega-col a {
        position: relative;
        z-index: 1;
      }

      .dropdown-menu-mega .mega-col-title {
        font-weight: 700;
        font-size: 0.95rem;
        color: #1a1a2e;
        padding: 0.2rem 0.4rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        display: flex;
        align-items: center;
        gap: 0.4rem;
      }

      .dropdown-menu-mega .mega-col-title i {
        color: #4a6aff;
      }

      .dropdown-menu-mega .mega-col a {
        color: rgba(0, 0, 0, 0.7);
        font-weight: 600;
        font-size: 0.92rem;
        padding: 0.25rem 0.8rem;
        display: flex;
        align-items: center;
        gap: 0.4rem;
        text-decoration: none;
        border-radius: 6px;
        transition: 0.15s;
      }

      .dropdown-menu-mega .mega-col a:hover {
        background: rgba(0, 0, 0, 0.04);
        color: #000000;
      }

      .dropdown-divider {
        border-top: 1px solid rgba(0, 0, 0, 0.06);
        margin: 0.2rem 1rem;
      }

      .dropdown-arrow-btn {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
        background: rgba(255, 255, 255, 0.06);
        border: none;
        color: rgba(255, 255, 255, 0.5);
        font-size: 0.8rem;
        padding: 0.3rem 0.7rem;
        border-radius: 8px;
        transition: all 0.25s ease;
        cursor: pointer;
        flex-shrink: 0;
        margin-left: 0.2rem;
      }

      .dropdown-arrow-btn:hover,
      .dropdown-arrow-btn:focus {
        color: #ffffff;
        background: rgba(255, 255, 255, 0.1);
      }

      .dropdown-arrow-btn.rotated i {
        transform: rotate(180deg);
      }

      .dropdown-arrow-btn i {
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
      }

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

    .btn-outline-light-custom {
      border: 1px solid rgba(255, 255, 255, 0.08);
      background: rgba(255, 255, 255, 0.02);
      color: rgb(255, 255, 255);
      border-radius: 40px;
      padding: 0.5rem 1.6rem;
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.02em;
      transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
      -webkit-backdrop-filter: blur(4px);
      backdrop-filter: blur(4px);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      white-space: nowrap;
    }

    .btn-outline-light-custom i {
      font-size: 0.9rem;
      opacity: 0.6;
      transition: opacity 0.3s;
    }

    .btn-outline-light-custom:hover {
      background: rgba(255, 255, 255, 0.06);
      color: #ffffff;
      border-color: rgba(255, 255, 255, 0.15);
      box-shadow: 0 0 30px rgba(138, 180, 255, 0.06);
      transform: translateY(-1px);
    }

    .btn-outline-light-custom:hover i {
      opacity: 1;
    }

    .navbar-toggler {
      border: 1px solid rgba(255, 255, 255, 0.06);
      border-radius: 12px;
      padding: 0.5rem 0.6rem;
      transition: border-color 0.3s;
      min-width: 44px;
      min-height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .navbar-toggler:hover {
      border-color: rgba(255, 255, 255, 0.15);
    }

    .navbar-toggler-icon {
      filter: invert(1) brightness(0.7);
      width: 1.2em;
      height: 1.2em;
    }

    /* ===== Banner ===== */
    .banner {
      background-image: url("/img/company.jpg");
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      /* ---- 固定宽高比 4:1 ---- */
      aspect-ratio: 4 / 1;
      margin-top: 80px;
      padding: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      text-align: center;
      position: relative;
      overflow: hidden;
      min-height: 180px;
    }

    .banner::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at center,
          rgba(0, 0, 0, 0) 0%,
          rgba(0, 0, 0, 0.6) 100%);
      z-index: 1;
      pointer-events: none;
    }

    .banner .container {
      position: relative;
      z-index: 2;
    }

    .banner h1 {
      font-size: 58px;
      font-weight: 700;
      margin-bottom: 20px;
      letter-spacing: 4px;
      color: #ffffff !important;
      text-shadow: 0 0 60px rgba(0, 0, 0, 0.6);
      line-height: 1.2;
    }

    .banner p {
      font-size: 20px;
      font-weight: 300;
      opacity: 0.92;
      max-width: 720px;
      margin: 0 auto;
      color: #ffffffb0;
      letter-spacing: 1px;
      text-shadow: 0 0 30px rgba(56, 189, 248, 0.08);
    }

    @media (max-width: 768px) {
      .banner {
        margin-top: 60px;
        /* 移动端导航栏通常较矮 */
        min-height: 140px;
        /* 适当减小 */
      }

      .banner h1 {
        font-size: 34px;
        letter-spacing: 2px;
      }

      .banner p {
        font-size: 18px;
        padding: 0 1rem;
      }
    }

    /* ===== 通用内容区 ===== */
    .section {
      padding: 60px 0;
    }

    .section-alt {
      background: var(--bg-surface);
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      font-size: 2.5rem;
      font-weight: 700;
      letter-spacing: -0.3px;
      color: #fff;
      position: relative;
      display: inline-block;
      padding-bottom: 14px;
    }

    .section-title h2::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 50px;
      height: 3px;
      border-radius: 4px;
      background: var(--gradient-brand);
    }

    .section-title p {
      color: var(--text-muted);
      margin-top: 10px;
      font-size: 1.5rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      font-weight: 500;
    }

    .equal-height-intro {
      min-height: 1200px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .equal-height-intro>.container {
      width: 100%;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .equal-height-section {
      min-height: 1000px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .equal-height-section>.container {
      width: 100%;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    /* ===== 公司简介（内容扩充） ===== */
    .about-content {
      display: flex;
      gap: 48px;
      align-items: stretch;
      flex-wrap: wrap;
    }

    .about-text {
      flex: 2;
      min-width: 280px;
      padding: 20px 10px;
    }

    .about-text p {
      font-size: 1.1rem;
      color: var(--text-secondary);
      line-height: 1.9;
      margin-bottom: 18px;
      text-indent: 2em;
    }

    .about-text .highlight {
      color: #ffffff;
      font-weight: 600;
      background: linear-gradient(135deg, #38bdf8, #818cf8);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent !important;
    }

    /* 新增：公司优势标签 */
    .advantage-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
      padding: 4px 12px;
      font-size: 0.75rem;
    }

    .advantage-tags span {
      background: rgba(56, 189, 248, 0.08);
      border: 1px solid rgba(56, 189, 248, 0.12);
      color: var(--accent-blue);
      padding: 4px 18px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 500;
      letter-spacing: 0.3px;
    }

    .about-side {
      flex: 1;
      min-width: 200px;
      background: var(--bg-card);
      padding: 28px 37px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      align-self: stretch;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .about-side h4 {
      font-size: 1.1rem;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--accent-blue);
      margin-bottom: 16px;
      font-weight: 600;
    }

    .about-side ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .about-side ul li {
      font-size: 1rem;
      color: var(--text-secondary);
      padding: 10px 0;
      padding-left: 24px;
      position: relative;
      border-bottom: 1px solid var(--border-subtle);
    }

    .about-side ul li:last-child {
      border-bottom: none;
    }

    .about-side ul li::before {
      content: "▹";
      position: absolute;
      left: 0;
      color: var(--accent-blue);
      font-weight: 600;
    }

    .about-product-link {
      color: var(--text-secondary);
      text-decoration: none;
      transition: color 0.3s ease;
    }

    .about-product-link:hover,
    .about-product-link:focus-visible {
      color: #ffffff;
    }

    /* ===== 企业文化 ===== */
    .culture-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    /* 4:3 图片容器 */
    .culture-img-wrapper {
      width: 100%;
      aspect-ratio: 4 / 3;
      overflow: hidden;
      background: var(--bg-elevated);
      flex-shrink: 0;
      position: relative;
    }

    .culture-img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    }

    /* 悬停时图片放大 */
    .culture-item:hover .culture-img-wrapper img {
      transform: scale(1.04);
    }

    .culture-item {
      background: var(--bg-card);
      padding: 25px 25px 25px 25px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
      text-align: center;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .culture-item::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--gradient-brand);
      opacity: 0;
      transition: var(--transition);
    }

    .culture-item:hover {
      transform: translateY(-6px);
      border-color: rgba(56, 189, 248, 0.2);
      background: var(--bg-card-hover);
      box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.7),
        0 0 0 1px rgba(56, 189, 248, 0.05);
    }

    .culture-item:hover::before {
      opacity: 1;
    }

    .culture-item .culture-body {
      padding: 22px 24px 0 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .culture-item h4 {
      font-size: 1.1rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 10px;
      margin-top: 0;
    }

    .culture-item p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.8;
      margin: 0;
    }

    /* ===== 新闻中心 ===== */
    .news-tabs {
      display: flex;
      gap: 4px;
      margin-bottom: 32px;
      flex-wrap: wrap;
      border-bottom: 1px solid var(--border-subtle);
      background: var(--bg-card);
      border-radius: var(--radius-sm);
      padding: 4px;
    }

    .news-tabs .tab-btn {
      padding: 10px 28px;
      background: transparent;
      border: none;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
      cursor: pointer;
      transition: var(--transition);
      border-radius: var(--radius-sm);
      letter-spacing: 0.3px;
    }

    .news-tabs .tab-btn:hover {
      color: #fff;
      background: rgba(255, 255, 255, 0.04);
    }

    .news-tabs .tab-btn.active {
      color: #fff;
      background: rgba(56, 189, 248, 0.12);
      box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.15);
    }

    .news-list {
      display: block;
    }

    .news-item {
      display: flex;
      gap: 20px;
      padding: 18px 20px;
      align-items: center;
      flex-wrap: wrap;
      background: var(--bg-card);
      border-radius: var(--radius-sm);
      margin-bottom: 8px;
      border: 1px solid var(--border-subtle);
      transition: var(--transition);
    }

    .news-item:hover {
      border-color: rgba(56, 189, 248, 0.15);
      background: var(--bg-card-hover);
      transform: translateX(4px);
    }

    .news-item .date {
      font-size: 0.8rem;
      color: var(--text-muted);
      min-width: 90px;
      font-weight: 500;
    }

    .news-item .title {
      flex: 1;
      font-size: 0.95rem;
      color: #fff;
      font-weight: 500;
      text-decoration: none;
      transition: color 0.2s;
    }

    .news-item .title:hover {
      color: var(--accent-blue);
    }

    .news-item .tag {
      font-size: 0.7rem;
      background: rgba(56, 189, 248, 0.08);
      color: var(--accent-blue);
      padding: 2px 14px;
      border-radius: 20px;
      font-weight: 500;
      letter-spacing: 0.5px;
      border: 1px solid rgba(56, 189, 248, 0.1);
    }

    .news-item .more-link {
      color: var(--text-muted);
      font-size: 0.85rem;
      text-decoration: none;
      transition: color 0.2s;
      font-weight: 500;
    }

    .news-item .more-link:hover {
      color: var(--accent-blue);
    }

    .news-detail {
      display: none;
      padding: 28px 0;
    }

    .news-detail.active {
      display: block;
    }

    .news-detail .back-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 20px;
      color: var(--text-muted);
      font-size: 0.9rem;
      cursor: pointer;
      transition: color 0.2s;
      text-decoration: none;
      background: var(--bg-card);
      padding: 6px 18px;
      border-radius: 30px;
      border: 1px solid var(--border-subtle);
    }

    .news-detail .back-link:hover {
      color: #fff;
      border-color: rgba(56, 189, 248, 0.2);
    }

    .news-detail h4 {
      font-size: 1.5rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 8px;
    }

    .news-detail .meta {
      color: var(--text-muted);
      font-size: 0.85rem;
      margin-bottom: 18px;
    }

    .news-detail .body {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 2;
    }

    .news-detail .body p {
      margin-bottom: 14px;
    }

    /* ===== 客户案例 ===== */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      transition: var(--transition);
      box-shadow: var(--shadow-card);
    }

    .case-item:hover {
      transform: translateY(-6px);
      border-color: rgba(56, 189, 248, 0.15);
      background: var(--bg-card-hover);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.7);
    }

    .case-item .case-img {
      aspect-ratio: 4 / 3;
      /* 固定 4:3 比例 */
      width: 100%;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(ellipse at center,
          rgba(56, 189, 248, 0.06) 0%,
          transparent 70%);
      border-bottom: 1px solid var(--border-subtle);
    }

    .case-item .case-img img {
      width: 100%;
      height: 100%;
      padding: 20px 20px 24px 20px;
      display: block;
    }

    /* 无图片时的占位图标 */
    .case-item .case-img .icon-placeholder {
      font-size: 48px;
      color: rgba(255, 255, 255, 0.1);
    }

    .case-item .case-body {
      padding: 22px 24px 26px;
    }

    .case-item .case-body h4 {
      font-size: 1rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 2px;
    }

    .case-item .case-body .sub {
      font-size: 0.8rem;
      color: var(--accent-blue);
      font-weight: 500;
      letter-spacing: 0.3px;
    }

    .case-item .case-body p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-top: 10px;
      line-height: 1.8;
    }

    .case-item .case-body .case-tag {
      display: inline-block;
      margin-top: 12px;
      font-size: 0.7rem;
      background: rgba(255, 255, 255, 0.04);
      color: var(--text-muted);
      padding: 4px 16px;
      border-radius: 20px;
      border: 1px solid var(--border-subtle);
      letter-spacing: 0.3px;
    }

    /* ===== 页脚 ===== */
    footer {
      background-color: #000000;
      text-align: center;
      padding: 2rem;
      color: #d1d5db;
      margin-top: 3rem;
    }

    .footer-dark {
      background-color: #000000;
      border-top: 1px solid #15273f;
      padding: 3rem 0 2rem;
    }

    footer p {
      margin-bottom: 0.25rem;
    }

    footer .small {
      color: #9ca3af;
    }

    footer a {
      color: #a0b4c8 !important;
      transition: color 0.2s;
    }

    footer a:hover {
      color: #38bdf8 !important;
      text-decoration: none;
    }

    footer .qr-img {
      width: 120px;
      height: 120px;
      margin-bottom: 10px;
      flex-shrink: 0;
      align-self: center;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.06);
      padding: 4px;
      background: #0a0a0a;
    }

    @media (max-width: 992px) {
      .culture-grid {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        align-items: stretch;
      }

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

    @media (max-width: 768px) {
      .section {
        padding: 40px 0;
      }

      .section-title h2 {
        font-size: 1.5rem;
      }

      .equal-height-intro {
        min-height: auto;
        height: auto;
        overflow: visible;
        justify-content: flex-start;
      }

      .equal-height-intro>.container {
        justify-content: flex-start;
      }

      .equal-height-section {
        min-height: auto;
        height: auto;
        overflow: visible;
        justify-content: flex-start;
      }

      .equal-height-section>.container {
        justify-content: flex-start;
      }

      .culture-grid {
        grid-template-columns: 1fr;
      }

      .case-grid {
        grid-template-columns: 1fr;
      }

      .about-content {
        flex-direction: column;
      }

      .news-item {
        display: flex;
        flex-wrap: wrap;
        align-items: baseline;
        padding: 14px 16px;
        gap: 4px 0;
      }

      /* 第一行：日期 + 标题 */
      .news-item .date {
        flex: 0 0 80px;
        /* 固定宽度，显示日期+前缀 */
        font-weight: 600;
        color: var(--text-secondary);
      }

      .news-item .title {
        flex: 1;
        /* 填充剩余宽度 */
        min-width: 0;
        /* 防止溢出 */
        font-size: 0.95rem;
        font-weight: 500;
      }

      /* 第二行容器：标签 + 详情链接 */
      .news-item .news-footer {
        flex: 0 0 100%;
        /* 占满整行 */
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 4px;
        border-top: 1px dashed var(--border-subtle);
        padding-top: 6px;
      }

      .news-item .tag {
        font-size: 0.7rem;
        padding: 2px 12px;
      }

      .news-item .more-link {
        font-size: 0.85rem;
        margin-left: auto;
        /* 靠右 */
      }

      /* 隐藏桌面端的水平分割线效果（可选） */
      .news-item:hover {
        transform: none;
      }

      .navbar {
        padding: 0.5rem 0;
      }

      .navbar-brand img {
        height: 36px;
      }

      .btn-outline-light-custom {
        padding: 0.4rem 1.2rem;
        font-size: 0.9rem;
      }
    }

    @media (max-width: 576px) {
      .about-side {
        padding: 20px;
      }

      .culture-item {
        padding: 24px 18px;
      }

      .news-tabs .tab-btn {
        padding: 8px 16px;
        font-size: 0.8rem;
      }

      .navbar {
        padding: 0.4rem 0;
      }

      .navbar-brand img {
        height: 32px;
      }

      .btn-outline-light-custom {
        padding: 0.35rem 1rem;
        font-size: 0.8rem;
      }

      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    .news-list.fade-in {
      animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
      from {
        opacity: 0.4;
        transform: translateY(6px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    /* 默认 (桌面) */
    .banner {
      aspect-ratio: 4 / 1;
      min-height: 180px;
    }

    /* 平板 */
    @media (max-width: 992px) {
      .banner {
        aspect-ratio: 3 / 1;
        min-height: 160px;
      }
    }

    /* 手机 */
    @media (max-width: 576px) {
      .banner {
        width: 100%;
        max-width: 100%;
        aspect-ratio: auto;
        box-sizing: border-box;
        min-height: 120px;
        margin-top: 56px;
      }

      .banner h1 {
        font-size: 26px;
        letter-spacing: 1px;
        margin-bottom: 8px;
      }

      .banner p {
        font-size: 14px;
        padding: 0 0.75rem;
        line-height: 1.5;
      }
    }