/* Reset & CSS Variables (Rainbow Palette & Clean Elements) */
    :root {
      --primary: #6366f1;
      --primary-gradient: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 20%, #ffbe53 40%, #4cd964 60%, #3b82f6 80%, #a855f7 100%);
      --light-bg: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --rainbow-blue: #3b82f6;
      --rainbow-green: #10b981;
      --rainbow-purple: #8b5cf6;
      --rainbow-orange: #f59e0b;
      --rainbow-pink: #ec4899;
      --transition: all 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }

    body {
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Typography & Utilities */
    h1, h2, h3, h4 {
      font-weight: 800;
      color: var(--text-main);
    }
    
    p {
      color: var(--text-muted);
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    .section-padding {
      padding: 80px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 50px;
      font-size: 2.2rem;
      position: relative;
    }

    .section-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: 9999px;
      transition: var(--transition);
      cursor: pointer;
      border: none;
    }

    .btn-gradient {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    }

    .btn-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
    }

    .btn-outline {
      border: 2px solid #6366f1;
      color: #6366f1;
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(99, 102, 241, 0.05);
      transform: translateY(-2px);
    }

    .card {
      background: var(--card-bg);
      border-radius: 16px;
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    }

    /* Header & Navigation */
    header {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 70px;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-menu {
      display: flex;
      gap: 20px;
      list-style: none;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      transition: var(--transition);
    }

    .nav-link:hover {
      color: var(--primary);
    }

    .nav-btn-box {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      border: none;
      background: transparent;
    }

    .menu-toggle span {
      width: 25px;
      height: 3px;
      background-color: var(--text-main);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      position: relative;
      background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, rgba(236, 72, 153, 0.05) 90%);
      padding: 100px 0 80px;
      text-align: center;
      overflow: hidden;
    }

    .hero-rainbow-bar {
      height: 5px;
      background: var(--primary-gradient);
      width: 100%;
      position: absolute;
      top: 0;
      left: 0;
    }

    .hero-content {
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 9999px;
      background: rgba(99, 102, 241, 0.1);
      color: #6366f1;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 20px;
      letter-spacing: 1px;
    }

    .hero-title {
      font-size: 3rem;
      line-height: 1.2;
      margin-bottom: 25px;
    }

    .hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 40px;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 15px;
    }

    /* Data Stats (Dashboard Cards) */
    .stats-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 60px;
    }

    .stat-card {
      background: var(--card-bg);
      border-radius: 12px;
      padding: 24px;
      text-align: center;
      border: 1px solid var(--border-color);
      border-top: 4px solid var(--primary);
    }

    .stat-card:nth-child(2) { border-top-color: var(--rainbow-green); }
    .stat-card:nth-child(3) { border-top-color: var(--rainbow-orange); }
    .stat-card:nth-child(4) { border-top-color: var(--rainbow-purple); }

    .stat-value {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 5px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* About Us */
    .about-section {
      background: #ffffff;
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }

    .about-tag {
      font-size: 0.9rem;
      color: var(--rainbow-purple);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 10px;
      display: block;
    }

    .about-features {
      margin-top: 30px;
    }

    .about-feat-item {
      display: flex;
      align-items: flex-start;
      gap: 15px;
      margin-bottom: 20px;
    }

    .feat-icon-bullet {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: linear-gradient(135deg, #a855f7, #6366f1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 0.8rem;
      flex-shrink: 0;
      margin-top: 3px;
    }

    /* AIGC Service System */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
    }

    .service-card {
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-gradient);
    }

    .service-icon {
      font-size: 2.5rem;
      margin-bottom: 15px;
    }

    .service-models {
      margin-top: 15px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .model-tag {
      font-size: 0.75rem;
      padding: 3px 8px;
      border-radius: 4px;
      background: var(--light-bg);
      color: var(--text-muted);
      border: 1px solid var(--border-color);
    }

    /* AIGC Workflow */
    .workflow-timeline {
      position: relative;
      max-width: 800px;
      margin: 0 auto;
    }

    .workflow-step {
      display: flex;
      gap: 30px;
      margin-bottom: 40px;
      position: relative;
    }

    .workflow-step::before {
      content: '';
      position: absolute;
      left: 20px;
      top: 40px;
      bottom: -40px;
      width: 2px;
      background: var(--border-color);
    }

    .workflow-step:last-child::before {
      display: none;
    }

    .step-num {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }

    .step-content {
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      flex-grow: 1;
    }

    /* Solutions */
    .solution-tabs-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
    }

    /* National Network & Technical Standards */
    .network-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      align-items: center;
    }

    .network-nodes {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 15px;
    }

    .node-item {
      padding: 15px;
      border-radius: 8px;
      background: white;
      border-left: 4px solid var(--rainbow-green);
      font-weight: 600;
    }

    .standards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

    /* Case Center (Allowed images used here) */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 25px;
    }

    .case-card {
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .case-image-wrapper {
      height: 200px;
      overflow: hidden;
      border-radius: 12px 12px 0 0;
      margin: -24px -24px 20px -24px;
    }

    .case-image-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .case-card:hover .case-image-wrapper img {
      transform: scale(1.05);
    }

    /* Comparison Table (Required) */
    .table-responsive {
      overflow-x: auto;
      background: white;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .eval-table th, .eval-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-table th {
      background: #f1f5f9;
      font-weight: 700;
    }

    .score-badge {
      background: linear-gradient(135deg, #f59e0b, #ef4444);
      color: white;
      padding: 4px 12px;
      border-radius: 9999px;
      font-weight: 800;
      display: inline-block;
    }

    /* Token Price list */
    .price-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .price-card {
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      background: white;
      position: relative;
    }

    .price-badge {
      position: absolute;
      top: 20px;
      right: 20px;
      background: rgba(16, 185, 129, 0.1);
      color: var(--rainbow-green);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 9999px;
      font-weight: 700;
    }

    /* Training Sections */
    .training-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

    .training-card {
      border-top: 4px solid var(--rainbow-pink);
    }

    /* Help & Encyclopedia */
    .encyclopedia-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border-color);
      background: white;
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px;
      font-weight: 700;
      font-size: 1.05rem;
      background: transparent;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 20px;
      color: var(--text-muted);
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      padding: 0 20px 20px 20px;
      border-top: 1px solid var(--border-color);
    }

    .faq-icon::after {
      content: '+';
      font-size: 1.3rem;
      font-weight: 500;
    }

    .faq-item.active .faq-icon::after {
      content: '-';
    }

    /* Customer Reviews */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 15px;
      margin-bottom: 15px;
    }

    .user-avatar {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-gradient);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1.2rem;
    }

    /* Contact Us & Submit Form */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 50px;
    }

    .form-wrapper {
      background: white;
      padding: 40px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      font-size: 0.9rem;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    }

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .kefu-qr-box {
      border: 1px dashed var(--primary);
      border-radius: 12px;
      padding: 20px;
      text-align: center;
      background: rgba(99, 102, 241, 0.02);
    }

    .kefu-qr-box img {
      width: 150px;
      height: 150px;
      border-radius: 8px;
      margin-bottom: 10px;
    }

    /* Articles / Blog List */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    /* Footer & YQLJ */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 40px;
      border-bottom: 1px solid #334155;
      padding-bottom: 40px;
      margin-bottom: 30px;
    }

    .footer-logo-desc p {
      color: #94a3b8;
      margin-top: 15px;
      font-size: 0.9rem;
    }

    .footer-title {
      color: white;
      font-size: 1.1rem;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      transition: var(--transition);
    }

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

    .friendship-links {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      margin-top: 20px;
      font-size: 0.85rem;
    }

    .friendship-links a {
      margin-right: 15px;
      color: #64748b;
      display: inline-block;
      margin-bottom: 5px;
    }

    .friendship-links a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      font-size: 0.85rem;
    }

    /* Float Service Button */
    .float-panel {
      position: fixed;
      right: 25px;
      bottom: 25px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 99;
    }

    .float-item {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: white;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      position: relative;
      transition: var(--transition);
      border: 1px solid var(--border-color);
    }

    .float-item:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .float-item svg {
      width: 24px;
      height: 24px;
      fill: var(--primary);
    }

    .float-popover {
      position: absolute;
      right: 65px;
      bottom: 0;
      background: white;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 15px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
      display: none;
      width: 180px;
      text-align: center;
    }

    .float-popover img {
      width: 120px;
      height: 120px;
      margin-bottom: 8px;
    }

    .float-popover p {
      font-size: 0.8rem;
      margin: 0;
      color: var(--text-main);
    }

    .float-item:hover .float-popover {
      display: block;
    }

    /* Responsiveness */
    @media (max-width: 992px) {
      .about-grid, .network-layout, .contact-grid {
        grid-template-columns: 1fr;
      }
      .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
      }
      .nav-menu.show {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }