:root {
      --primary: #5c3ff4;
      --primary-dark: #4325cf;
      --secondary: #00d2ff;
      --accent: #ff4081;
      --amber: #ff9800;
      --emerald: #00c853;
      --bg-base: #f9fbfd;
      --bg-surface: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border: #e2e8f0;
      --border-light: #f1f5f9;
      --shadow-sm: 0 2px 8px rgba(92, 63, 244, 0.04);
      --shadow-md: 0 8px 24px rgba(92, 63, 244, 0.08);
      --shadow-lg: 0 16px 36px rgba(92, 63, 244, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --max-width: 1200px;
      --transition: all 0.25s ease-in-out;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 0% 0%, rgba(92, 63, 244, 0.03) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 210, 255, 0.04) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(255, 64, 129, 0.02) 0px, transparent 50%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    ul, ol {
      list-style: none;
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-item {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-item:hover {
      color: var(--primary);
      background-color: rgba(92, 63, 244, 0.05);
    }

    .nav-item.ai-page-home-link {
      color: var(--primary);
      font-weight: 600;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(92, 63, 244, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(92, 63, 244, 0.35);
      color: #ffffff;
    }

    .btn-outline {
      border-color: var(--border);
      color: var(--text-main);
      background: var(--bg-surface);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(92, 63, 244, 0.03);
    }

    .btn-rainbow {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
      color: #ffffff;
      font-weight: 700;
      padding: 14px 34px;
      font-size: 1.05rem;
      box-shadow: 0 6px 20px rgba(92, 63, 244, 0.25);
    }

    .btn-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255, 64, 129, 0.3);
      color: #ffffff;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      padding: 8px;
      cursor: pointer;
      color: var(--text-main);
    }

    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .badge {
      display: inline-block;
      padding: 6px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 30px;
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .badge-primary {
      background: rgba(92, 63, 244, 0.08);
      color: var(--primary);
      border: 1px solid rgba(92, 63, 244, 0.15);
    }

    .badge-rainbow {
      background: linear-gradient(90deg, rgba(92, 63, 244, 0.1), rgba(0, 210, 255, 0.1), rgba(255, 64, 129, 0.1));
      color: var(--primary-dark);
      border: 1px solid rgba(92, 63, 244, 0.2);
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* Hero */
    .hero-section {
      padding: 90px 0 70px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-container {
      max-width: 980px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }

    .hero-h1 span.gradient-text {
      background: linear-gradient(135deg, var(--primary) 0%, #7928ca 40%, var(--accent) 70%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 48px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
      text-align: left;
    }

    .stat-card {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      padding: 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 3px solid var(--primary);
    }

    .stat-card:nth-child(2) { border-top-color: var(--secondary); }
    .stat-card:nth-child(3) { border-top-color: var(--accent); }
    .stat-card:nth-child(4) { border-top-color: var(--emerald); }

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

    .stat-val {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--text-main);
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .stat-val span {
      font-size: 1rem;
      color: var(--primary);
      font-weight: 600;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .service-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: rgba(92, 63, 244, 0.4);
      box-shadow: var(--shadow-md);
    }

    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      background: rgba(92, 63, 244, 0.08);
      color: var(--primary);
    }

    .service-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Model Logos Cloud */
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    /* Comparison Table */
    .table-container {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

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

    .comparison-table th, .comparison-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border);
      font-size: 0.95rem;
    }

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table td.highlight {
      background: rgba(92, 63, 244, 0.03);
      font-weight: 600;
      color: var(--primary);
      border-left: 2px solid rgba(92, 63, 244, 0.2);
      border-right: 2px solid rgba(92, 63, 244, 0.2);
    }

    .score-badge-wrap {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 24px;
      justify-content: center;
    }

    .score-badge {
      background: linear-gradient(135deg, var(--amber), #ff5722);
      color: white;
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 800;
      font-size: 1.1rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

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

    .step-card {
      background: var(--bg-surface);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* Gallery & Case */
    .case-media-wrap {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .media-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-desc-box {
      padding: 16px 20px;
    }

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

    .testimonial-card {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }

    .user-avatar-initial {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .user-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }

    .user-meta p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* Accordion FAQ */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-header {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-body {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-body {
      padding-bottom: 20px;
      max-height: 500px;
      transition: max-height 0.3s ease-in-out;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .faq-icon {
      transition: transform 0.25s;
      font-size: 1.1rem;
    }

    /* Form Section */
    .form-wrapper {
      background: var(--bg-surface);
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-lg);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .form-full {
      grid-column: 1 / -1;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background-color: #fff;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(92, 63, 244, 0.15);
    }

    /* Articles & Links */
    .article-pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 24px;
    }

    .article-pill {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
    }

    .article-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }

    /* Footer */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 70px 0 30px;
      border-top: 1px solid #1e293b;
      margin-top: 80px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-heading {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

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

    .footer-links a {
      color: #94a3b8;
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      margin-bottom: 12px;
      font-size: 0.92rem;
    }

    .qr-card-footer {
      background: #1e293b;
      padding: 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
    }

    .qr-card-footer img {
      width: 105px;
      height: 105px;
      display: block;
      border-radius: 4px;
    }

    .qr-card-footer p {
      font-size: 0.8rem;
      color: #cbd5e1;
      margin-top: 6px;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.88rem;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .footer-friendly-links a {
      color: #94a3b8;
    }

    .footer-friendly-links a:hover {
      color: var(--secondary);
    }

    /* Floating Widget */
    .floating-cs {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .cs-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      box-shadow: 0 4px 16px rgba(92, 63, 244, 0.4);
      cursor: pointer;
      position: relative;
      transition: var(--transition);
      border: none;
    }

    .cs-btn:hover {
      transform: scale(1.08);
    }

    .cs-popup {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
      width: 220px;
      display: none;
      color: var(--text-main);
      text-align: center;
    }

    .floating-cs:hover .cs-popup {
      display: block;
    }

    .cs-popup img {
      width: 140px;
      height: 140px;
      margin: 8px auto;
      display: block;
    }

    /* Banner Showcase */
    .banner-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .banner-item img {
      width: 100%;
      display: block;
      height: auto;
    }

    @media (max-width: 1024px) {
      .grid-4, .hero-stats, .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-h1 {
        font-size: 2.1rem;
      }
      .grid-2, .grid-3, .grid-4, .testimonials-grid, .hero-stats, .steps-row, .case-media-wrap, .banner-grid {
        grid-template-columns: 1fr;
      }
      .nav-links, .nav-cta-group {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
      .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        gap: 0;
      }
    }