:root {
      --primary: #4f46e5;
      --primary-dark: #3730a3;
      --accent: #ff0055;
      --accent-cyan: #00d2ff;
      --accent-yellow: #ffb800;
      --dark: #0f172a;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --card-border: #e2e8f0;
      --radius: 12px;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
      --shadow-lg: 0 20px 25px -5px rgba(79, 70, 229, 0.12), 0 8px 10px -6px rgba(79, 70, 229, 0.08);
      --max-width: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at top right, rgba(0, 210, 255, 0.08), transparent 40%),
                  radial-gradient(circle at top left, rgba(255, 0, 85, 0.05), transparent 40%),
                  var(--bg-light);
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header & Navigation */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--accent-cyan);
      box-shadow: var(--shadow-sm);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-logo-area img.ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      color: var(--dark);
      letter-spacing: -0.5px;
    }

    .brand-title span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 600;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.08);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
      padding: 10px 22px;
      border-radius: 8px;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 2px solid transparent;
      text-align: center;
    }

    .btn-contrast {
      background: linear-gradient(135deg, var(--accent) 0%, #ff4b2b 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 0, 85, 0.35);
    }

    .btn-contrast:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 0, 85, 0.5);
    }

    .btn-primary {
      background: var(--primary);
      color: #ffffff;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--dark);
      border-color: #cbd5e1;
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .btn-hero-official {
      background: #000000;
      color: #ffffff;
      border: 2px solid var(--accent-cyan);
      font-size: 16px;
      padding: 12px 28px;
      box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
    }

    .btn-hero-official:hover {
      background: var(--dark);
      border-color: var(--accent);
      color: #ffffff;
      transform: scale(1.03);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--dark);
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 0, 85, 0.1);
      border: 1px solid rgba(255, 0, 85, 0.3);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .hero-content h1 {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-content h1 span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 30px;
    }

    .hero-action-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-features-badge {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .badge-item {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 600;
      background: #ffffff;
      padding: 6px 12px;
      border-radius: 6px;
      border: 1px solid var(--card-border);
      color: var(--text-main);
    }

    .badge-item::before {
      content: "✓";
      color: var(--accent-cyan);
      font-weight: 900;
    }

    /* Hero Tech Visual Box (Pure CSS/Data) */
    .hero-tech-card {
      background: linear-gradient(145deg, #ffffff 0%, #f1f5f9 100%);
      border: 2px solid var(--accent-cyan);
      border-radius: 20px;
      padding: 30px;
      box-shadow: 0 20px 40px -10px rgba(0, 210, 255, 0.15);
      position: relative;
      overflow: hidden;
    }

    .tech-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #e2e8f0;
      padding-bottom: 16px;
      margin-bottom: 20px;
    }

    .tech-card-title {
      font-weight: 800;
      color: var(--dark);
      font-size: 16px;
    }

    .tech-card-status {
      font-size: 12px;
      background: #ecfdf5;
      color: #059669;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      gap: 5px;
    }

    .tech-card-status::before {
      content: "";
      width: 6px;
      height: 6px;
      background: #10b981;
      border-radius: 50%;
      display: inline-block;
    }

    .tech-model-matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-bottom: 20px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 8px 6px;
      border-radius: 8px;
      text-align: center;
      font-size: 12px;
      font-weight: 700;
      color: var(--text-main);
      transition: all 0.2s;
    }

    .model-chip:hover {
      border-color: var(--accent);
      color: var(--accent);
      transform: translateY(-2px);
    }

    .tech-stats-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .tech-stat-box {
      background: #ffffff;
      padding: 14px;
      border-radius: 10px;
      border: 1px solid #e2e8f0;
    }

    .tech-stat-label {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 4px;
    }

    .tech-stat-value {
      font-size: 20px;
      font-weight: 900;
      color: var(--primary);
    }

    /* Section Base */
    section {
      padding: 60px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 45px;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 13px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--accent);
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Cards Grid */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    /* Service Feature Cards */
    .feature-card {
      background: var(--bg-white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 24px;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-cyan);
    }

    .feature-card.highlight {
      border: 2px solid var(--accent);
      box-shadow: 0 8px 24px rgba(255, 0, 85, 0.08);
    }

    .feature-icon-badge {
      width: 44px;
      height: 44px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(0, 210, 255, 0.2));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .feature-title {
      font-size: 18px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Comparison Table Component */
    .comparison-wrapper {
      background: #ffffff;
      border: 2px solid var(--primary);
      border-radius: 16px;
      overflow-x: auto;
      box-shadow: var(--shadow-md);
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--card-border);
      font-size: 14px;
    }

    .comp-table th {
      background: #f1f5f9;
      font-weight: 800;
      color: var(--dark);
    }

    .comp-table th.highlight-col {
      background: var(--primary);
      color: #ffffff;
      font-size: 16px;
    }

    .comp-table td.highlight-col {
      background: rgba(79, 70, 229, 0.03);
      font-weight: 700;
      color: var(--primary-dark);
      border-left: 2px solid var(--primary);
      border-right: 2px solid var(--primary);
    }

    .score-badge {
      display: inline-block;
      padding: 4px 10px;
      background: var(--accent);
      color: #ffffff;
      font-weight: 800;
      border-radius: 6px;
      font-size: 13px;
    }

    /* Media/Image Section */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--card-border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .media-img-container {
      width: 100%;
      background: #e2e8f0;
      overflow: hidden;
    }

    .media-img-container img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s;
    }

    .media-card:hover .media-img-container img {
      transform: scale(1.03);
    }

    .media-content {
      padding: 20px;
    }

    .media-content h3 {
      font-size: 17px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 8px;
    }

    .media-content p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Flow Steps */
    .flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-top: 4px solid var(--accent);
      border-radius: 12px;
      padding: 24px 18px;
      text-align: center;
    }

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--dark);
      color: #ffffff;
      font-weight: 900;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
      font-size: 15px;
    }

    .flow-step-card h3 {
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .flow-step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Testimonials */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .testimonial-quote {
      font-size: 14px;
      line-height: 1.6;
      color: var(--text-main);
      margin-bottom: 16px;
      font-style: italic;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }

    .user-avatar-initial {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .user-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--dark);
    }

    .user-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ Section */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: 8px;
      overflow: hidden;
      transition: all 0.2s;
    }

    .faq-question {
      padding: 18px 20px;
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 18px;
      font-weight: 900;
      color: var(--accent);
      transition: transform 0.3s;
    }

    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px dashed #f1f5f9;
      margin-top: 4px;
      padding-top: 12px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* Form & Contact Section */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: #ffffff;
      border: 2px solid var(--accent-cyan);
      border-radius: 20px;
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info h3 {
      font-size: 24px;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 16px;
    }

    .contact-info p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .contact-detail-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 24px;
    }

    .contact-detail-list li {
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px;
      background: #f8fafc;
      border-radius: 12px;
      border: 1px dashed #cbd5e1;
    }

    .qr-container img {
      width: 90px;
      height: 90px;
      border-radius: 8px;
      display: block;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
    }

    textarea.form-control {
      min-height: 90px;
      resize: vertical;
    }

    /* Articles & Friendly Links Section */
    .extra-section {
      background: #ffffff;
      border-top: 1px solid #e2e8f0;
      border-bottom: 1px solid #e2e8f0;
    }

    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .article-item-card {
      padding: 16px;
      border-radius: 8px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      transition: all 0.2s;
    }

    .article-item-card:hover {
      border-color: var(--primary);
    }

    .article-item-card a {
      font-size: 14px;
      font-weight: 700;
      color: var(--dark);
      text-decoration: none;
      display: block;
      margin-bottom: 6px;
    }

    .article-item-card a:hover {
      color: var(--primary);
    }

    .article-item-card span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Footer */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 40px 0 24px;
      font-size: 13px;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .footer-links-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      padding-bottom: 16px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-links-row a {
      color: #cbd5e1;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-links-row a:hover {
      color: var(--accent-cyan);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* Floating Customer Service */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .kefu-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--accent);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 20px;
      box-shadow: 0 4px 12px rgba(255, 0, 85, 0.4);
      cursor: pointer;
      position: relative;
    }

    .kefu-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: var(--shadow-lg);
      border: 1px solid #e2e8f0;
      width: 140px;
      text-align: center;
      display: none;
    }

    .kefu-btn:hover .kefu-popover {
      display: block;
    }

    .kefu-popover img {
      width: 100%;
      height: auto;
      border-radius: 6px;
    }

    .kefu-popover p {
      font-size: 11px;
      color: var(--dark);
      font-weight: 700;
      margin-top: 6px;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-contrast {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.show-mobile {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 2px solid var(--accent);
        box-shadow: var(--shadow-md);
      }
      .grid-4, .grid-3, .grid-2, .articles-grid, .flow-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
    }