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

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background: #f8fafc;
      color: #0b1e3a;
      line-height: 1.6;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* ----- 导航栏 (移除登录/试用，增加电话) ----- */
    .navbar {
      background: #ffffff;
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
      padding: 0.8rem 0;
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid #eef2f6;
      backdrop-filter: blur(2px);
    }

    .navbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      position: relative;
    }

    .menu-toggle {
      display: none;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo i {
      font-size: 2rem;
      color: #2563eb;
      background: #e0e7ff;
      padding: 0.5rem;
      border-radius: 14px;
    }

    .logo span {
      font-weight: 700;
      font-size: 1.7rem;
      letter-spacing: -0.5px;
      color: #0b1e3a;
    }

    .logo span small {
      font-weight: 400;
      font-size: 0.8rem;
      color: #64748b;
      margin-left: 6px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-weight: 500;
      flex-wrap: wrap;
    }

    .nav-links a {
      text-decoration: none;
      color: #1e293b;
      font-size: 0.98rem;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover {
      color: #2563eb;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: #2563eb;
      transition: width 0.25s;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-links .api-badge {
      background: #2563eb10;
      color: #2563eb;
      padding: 0.2rem 0.8rem;
      border-radius: 40px;
      font-size: 0.7rem;
      font-weight: 600;
      letter-spacing: 0.3px;
      border: 1px solid #2563eb20;
      margin-left: 4px;
    }

    /* 联系电话按钮 (替代登录/试用) */
    .nav-phone {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      background: #f1f5f9;
      padding: 0.4rem 1.2rem 0.4rem 1rem;
      border-radius: 60px;
      color: #0b1e3a;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
      border: 1px solid transparent;
    }

    .nav-phone i {
      color: #2563eb;
      font-size: 1.1rem;
    }

    .nav-phone:hover {
      background: #e0e7ff;
      border-color: #2563eb20;
    }

    /* ----- Hero 轮播 (保留5幅) ----- */
    .hero-carousel {
      position: relative;
      background: #0b1e3a;
      overflow: hidden;
      min-height: 460px;
      display: flex;
      align-items: center;
    }

    .carousel-slide {
      display: none;
      width: 100%;
      padding: 3rem 0;
      animation: fade 0.6s ease;
    }

    .carousel-slide.active {
      display: block;
    }

    @keyframes fade {
      0% { opacity: 0.3; transform: scale(0.98); }
      100% { opacity: 1; transform: scale(1); }
    }

    .carousel-slide .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
    }

    .slide-content {
      flex: 1 1 500px;
      color: white;
    }

    .slide-content .badge-slide {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(4px);
      padding: 0.25rem 1.2rem;
      border-radius: 40px;
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.5px;
      color: #b9d0ff;
      border: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 1rem;
    }

    .slide-content h2 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 0.8rem;
    }

    .slide-content h2 i {
      color: #60a5fa;
      margin-right: 10px;
    }

    .slide-content p {
      font-size: 1.15rem;
      color: #cbd5e1;
      max-width: 550px;
      margin-bottom: 1.8rem;
    }

    .slide-content .btn-light {
      background: white;
      color: #0b1e3a;
      padding: 0.6rem 2.2rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.2s;
      border: 1px solid transparent;
    }

    .slide-content .btn-light:hover {
      background: #e0e7ff;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    }

    .slide-content .btn-outline-light {
      background: transparent;
      color: white;
      border: 1.5px solid #4b6a8f;
      padding: 0.6rem 2.2rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.2s;
      margin-left: 0.8rem;
    }

    .slide-content .btn-outline-light:hover {
      border-color: white;
      background: rgba(255,255,255,0.05);
    }

    .slide-image {
      flex: 1 1 280px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 6rem;
      color: rgba(255,255,255,0.08);
    }

    .slide-image i {
      filter: drop-shadow(0 8px 24px rgba(37, 99, 235, 0.2));
      transition: all 0.3s;
    }

    .slide-image i:hover {
      transform: scale(1.04);
      color: rgba(255,255,255,0.18);
    }

    /* 轮播控制 */
    .carousel-controls {
      position: absolute;
      bottom: 20px;
      left: 0;
      right: 0;
      display: flex;
      justify-content: center;
      gap: 0.8rem;
      z-index: 10;
    }

    .carousel-dot {
      width: 12px;
      height: 12px;
      border-radius: 40px;
      background: rgba(255,255,255,0.25);
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      padding: 0;
    }

    .carousel-dot.active {
      background: white;
      width: 32px;
    }

    .carousel-dot:hover {
      background: rgba(255,255,255,0.5);
    }

    .carousel-arrow {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      background: rgba(255,255,255,0.06);
      border: none;
      color: white;
      font-size: 1.8rem;
      padding: 0.2rem 1rem;
      cursor: pointer;
      border-radius: 60px;
      backdrop-filter: blur(4px);
      transition: all 0.2s;
      z-index: 10;
      border: 1px solid rgba(255,255,255,0.05);
    }

    .carousel-arrow:hover {
      background: rgba(255,255,255,0.12);
    }

    .carousel-arrow.prev {
      left: 1.5rem;
    }

    .carousel-arrow.next {
      right: 1.5rem;
    }

    @media (max-width: 768px) {
      .carousel-arrow { display: none; }
      .slide-content h2 { font-size: 2.2rem; }
      .slide-image { font-size: 4rem; }
    }

    /* ----- 布局优化：场景方案与优势合并为“解决方案”大区块 ----- */
    .solutions-wrapper {
      padding: 4.5rem 0;
      background: white;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 0.8rem;
      color: #0b1e3a;
    }

    .section-subtitle {
      font-size: 1.15rem;
      color: #475569;
      max-width: 700px;
      margin-bottom: 2.5rem;
    }

    .text-center { text-align: center; }
    .mx-auto { margin-left: auto; margin-right: auto; }

    /* 场景卡片 (优化间距与视觉) */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
      margin-top: 2.5rem;
    }

    .scene-card {
      background: #fafcff;
      border-radius: 32px;
      padding: 2.2rem 1.8rem;
      border: 1px solid #edf2f9;
      transition: all 0.25s;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
      position: relative;
      overflow: hidden;
    }

    .scene-card:hover {
      transform: translateY(-6px);
      border-color: #bdd3ff;
      box-shadow: 0 18px 30px -12px rgba(37, 99, 235, 0.12);
      background: white;
    }

    .scene-card .scene-icon {
      font-size: 2.8rem;
      color: #2563eb;
      background: #e0e7ff;
      padding: 0.7rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 1.2rem;
    }

    .scene-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }

    .scene-card p {
      color: #475569;
      font-size: 0.95rem;
      margin-bottom: 1.2rem;
    }

    .scene-card .feature-list {
      list-style: none;
      padding: 0;
    }

    .scene-card .feature-list li {
      display: flex;
      align-items: center;
      gap: 0.6rem;
      font-size: 0.9rem;
      color: #334155;
      margin-bottom: 0.5rem;
    }

    .scene-card .feature-list li i {
      color: #2563eb;
      font-size: 0.8rem;
      width: 1.2rem;
    }

    .scene-card .btn-scene {
      margin-top: 1.2rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-weight: 600;
      color: #2563eb;
      text-decoration: none;
    }

    .scene-card .btn-scene i {
      transition: transform 0.2s;
    }

    .scene-card .btn-scene:hover i {
      transform: translateX(4px);
    }

    /* 优势卡片 (独立模块，更突出) */
    .advantage-section {
      padding: 4rem 0;
      background: #f8fafd;
    }

    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 2.5rem;
      margin-top: 2.5rem;
    }

    .advantage-item {
      text-align: center;
      padding: 1.8rem 1.2rem;
      background: white;
      border-radius: 28px;
      border: 1px solid #eef2f6;
      transition: all 0.2s;
    }

    .advantage-item:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -12px rgba(0,0,0,0.06);
    }

    .advantage-item .adv-icon {
      font-size: 2.5rem;
      color: #2563eb;
      margin-bottom: 0.8rem;
    }

    .advantage-item h4 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 0.3rem;
    }

    .advantage-item p {
      color: #475569;
      font-size: 0.9rem;
    }

    /* 典型案例 (整合到优势下方) */
    .case-show {
      margin-top: 3rem;
      background: white;
      border-radius: 40px;
      padding: 1.8rem 2rem;
      border: 1px solid #eef2f6;
      display: inline-block;
      width: auto;
    }

    .case-show p {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      flex-wrap: wrap;
      justify-content: center;
      margin: 0;
      color: #1e293b;
    }

    .case-show p i {
      color: #2563eb;
      margin-right: 6px;
    }

    /* API 模块 (保持) */
    .api-highlight {
      background: #ffffff;
      padding: 3rem 0;
      border-bottom: 1px solid #eef2f6;
      border-top: 1px solid #eef2f6;
      scroll-margin-top: 80px;
    }

    .api-highlight .container {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 2rem;
    }

    .api-highlight .api-text {
      flex: 2 1 400px;
    }

    .api-highlight .api-text h2 {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 0.3rem;
      color: #0b1e3a;
    }

    .api-highlight .api-text h2 i {
      color: #2563eb;
      margin-right: 10px;
    }

    .api-highlight .api-text p {
      color: #475569;
      font-size: 1.05rem;
      max-width: 600px;
    }

    .api-highlight .api-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .api-highlight .btn-primary-outline {
      background: transparent;
      color: #2563eb;
      border: 1.5px solid #2563eb;
      padding: 0.5rem 2rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .api-highlight .btn-primary-outline:hover {
      background: #2563eb;
      color: white;
    }

    .api-highlight .btn-primary-solid {
      background: #2563eb;
      color: white;
      padding: 0.5rem 2rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid #2563eb;
    }

    .api-highlight .btn-primary-solid:hover {
      background: #1d4ed8;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(37, 99, 235, 0.15);
    }

    /* 服务卡片 (精简为4项，布局更均衡) */
    .services {
      padding: 4rem 0;
      background: white;
    }

    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 2rem;
      margin-top: 2rem;
    }

    .service-card {
      background: #fafcff;
      padding: 2rem 1.6rem;
      border-radius: 32px;
      border: 1px solid #edf2f9;
      transition: all 0.25s;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
      text-align: center;
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: #bdd3ff;
      box-shadow: 0 18px 30px -12px rgba(37, 99, 235, 0.12);
      background: white;
    }

    .service-card i {
      font-size: 2.5rem;
      color: #2563eb;
      background: #e0e7ff;
      padding: 0.6rem;
      border-radius: 18px;
      margin-bottom: 1.2rem;
      display: inline-block;
    }

    .service-card h3 {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 0.4rem;
    }

    .service-card p {
      color: #475569;
      font-size: 0.95rem;
    }

    .service-card .link-arrow {
      margin-top: 1rem;
      display: inline-block;
      font-weight: 600;
      color: #2563eb;
      text-decoration: none;
    }

    /* CTA (保留，但去除免费试用字样，改为联系销售) */
    .cta {
      padding: 4rem 0;
      background: #0b1e3a;
      color: white;
    }

    .cta .container {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .cta h2 {
      font-size: 2.6rem;
      font-weight: 700;
      margin-bottom: 0.6rem;
    }

    .cta p {
      font-size: 1.2rem;
      color: #cbd5e1;
      max-width: 600px;
      margin-bottom: 2rem;
    }

    .cta .btn-phone {
      background: white;
      color: #0b1e3a;
      padding: 0.8rem 2.8rem;
      font-size: 1.1rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: all 0.2s;
      border: none;
    }

    .cta .btn-phone:hover {
      background: #e0e7ff;
      transform: scale(1.02);
      box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    }

    /* footer */
    .footer {
      background: #0f2a44;
      color: #b9c9e0;
      padding: 3rem 0 1.5rem;
      border-top: 1px solid #1d3b5a;
    }

    .footer .container {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 2rem;
    }

    .footer-col {
      flex: 1 1 160px;
    }

    .footer-col h5 {
      color: white;
      font-size: 1.1rem;
      margin-bottom: 1rem;
      font-weight: 600;
    }

    .footer-col p, .footer-col a {
      color: #b9c9e0;
      text-decoration: none;
      font-size: 0.95rem;
      display: block;
      margin-bottom: 0.4rem;
    }

    .footer-col a:hover {
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid #1d3b5a;
      margin-top: 2.5rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
      color: #8da1bb;
      width: 100%;
    }

    /* 响应式调整 */
    @media (max-width: 768px) {
      .api-highlight {
        scroll-margin-top: 88px;
      }
      .navbar {
        padding: 0.65rem 0;
      }
      .navbar .container {
        flex-direction: row;
        flex-wrap: nowrap;
        gap: 1rem;
      }
      .logo i {
        font-size: 1.45rem;
        padding: 0.45rem;
        border-radius: 12px;
      }
      .logo span {
        font-size: 1.35rem;
      }
      .logo span small {
        display: none;
      }
      .menu-toggle {
        width: 44px;
        height: 44px;
        padding: 0;
        border: 1px solid #dbe4f0;
        border-radius: 12px;
        background: #f8fafc;
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
        cursor: pointer;
      }
      .menu-toggle span {
        width: 20px;
        height: 2px;
        border-radius: 2px;
        background: #0b1e3a;
        transition: transform 0.2s, opacity 0.2s;
      }
      .navbar.nav-open .menu-toggle span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
      }
      .navbar.nav-open .menu-toggle span:nth-child(2) {
        opacity: 0;
      }
      .navbar.nav-open .menu-toggle span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
      }
      .nav-links {
        display: none;
        position: absolute;
        top: calc(100% + 0.65rem);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.55rem;
        background: #ffffff;
        border: 1px solid #e2e8f0;
        border-radius: 16px;
        box-shadow: 0 18px 40px rgba(15, 42, 68, 0.16);
      }
      .navbar.nav-open .nav-links {
        display: flex;
      }
      .nav-links a {
        padding: 0.78rem 0.9rem;
        border-radius: 10px;
      }
      .nav-links a:hover {
        background: #f1f5f9;
      }
      .nav-links a::after {
        display: none;
      }
      .nav-phone {
        justify-content: center;
        margin-top: 0.35rem;
        padding: 0.65rem 1rem;
        font-size: 0.95rem;
      }
      .section-title {
        font-size: 2rem;
      }
      .api-highlight .api-text h2 {
        font-size: 1.8rem;
      }
      .cta h2 {
        font-size: 2rem;
      }
      .slide-content h2 {
        font-size: 2rem;
      }
      .case-show p {
        gap: 0.8rem;
        flex-direction: column;
        align-items: flex-start;
      }
      .footer {
        padding: 2.4rem 0 1.2rem;
      }
      .footer .container {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 1.6rem 0.75rem;
      }
      .footer-col {
        min-width: 0;
        text-align: center;
      }
      .footer-col:first-child {
        grid-column: 1 / -1;
        padding-bottom: 1.4rem;
        border-bottom: 1px solid #1d3b5a;
      }
      .footer-col h5 {
        font-size: 1rem;
        margin-bottom: 0.75rem;
      }
      .footer-col p,
      .footer-col a {
        font-size: 0.86rem;
        line-height: 1.55;
        margin-bottom: 0.5rem;
      }
      .footer-bottom {
        grid-column: 1 / -1;
        margin-top: 0.35rem;
        padding-top: 1.2rem;
        font-size: 0.78rem;
        line-height: 1.7;
      }
    }

    @media (max-width: 480px) {
      .container {
        padding: 0 1.2rem;
      }
      .slide-content .btn-outline-light {
        margin-left: 0;
        margin-top: 0.5rem;
      }
      .footer .container {
        gap: 1.4rem 0.55rem;
      }
      .footer-col h5 {
        font-size: 0.95rem;
      }
      .footer-col p,
      .footer-col a {
        font-size: 0.8rem;
      }
    }