:root {
      --primary: #4f46e5;
      --primary-dark: #3730a3;
      --accent: #ff3366;
      --accent-gradient: linear-gradient(135deg, #ff3366 0%, #ff6b00 50%, #7928ca 100%);
      --bg-base: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 35px -10px rgba(79, 70, 229, 0.15);
      --radius: 14px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    body {
      line-height: 1.6;
      color: var(--text-main);
      background: radial-gradient(circle at 10% 20%, rgba(255, 51, 102, 0.04) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(79, 70, 229, 0.04) 0%, transparent 40%),
                  var(--bg-base);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    /* Header & Nav */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-area .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: 8px;
      transition: all 0.2s ease;
    }

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

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

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 9999px;
      font-weight: 700;
      font-size: 0.95rem;
      text-decoration: none;
      color: #ffffff;
      background: var(--accent-gradient);
      box-shadow: 0 4px 14px rgba(255, 51, 102, 0.35);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 51, 102, 0.5);
    }

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

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 70px 0 50px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-radius: 9999px;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: clamp(2rem, 4vw, 2.75rem);
      font-weight: 900;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

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

    .hero-desc {
      font-size: clamp(1rem, 1.8vw, 1.15rem);
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      font-weight: 400;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-main-action {
      display: inline-flex;
      align-items: center;
      padding: 14px 34px;
      border-radius: 12px;
      font-size: 1.1rem;
      font-weight: 700;
      text-decoration: none;
      color: #ffffff;
      background: var(--accent-gradient);
      box-shadow: 0 10px 25px rgba(255, 51, 102, 0.4);
      transition: all 0.25s ease;
    }

    .btn-main-action:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 14px 30px rgba(255, 51, 102, 0.55);
    }

    .btn-secondary-action {
      display: inline-flex;
      align-items: center;
      padding: 14px 28px;
      border-radius: 12px;
      font-size: 1.1rem;
      font-weight: 700;
      text-decoration: none;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .btn-secondary-action:hover {
      background-color: #f1f5f9;
      border-color: #cbd5e1;
      transform: translateY(-2px);
    }

    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-md);
    }

    .metric-item {
      text-align: center;
    }

    .metric-value {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Section Common Styles */
    section {
      padding: 70px 0;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 9999px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: clamp(1.6rem, 2.5vw, 2.1rem);
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto;
    }

    /* Platform Overview */
    .about-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 30px;
    }

    .about-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
      margin-top: 24px;
    }

    .about-item {
      background: #f8fafc;
      padding: 20px;
      border-radius: 10px;
      border-left: 4px solid var(--primary);
    }

    .about-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .about-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Supported Models Matrix */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 5px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

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

    /* Service Capabilities Grid */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }

    .service-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
      flex-grow: 1;
    }

    .service-badge {
      font-size: 0.75rem;
      font-weight: 700;
      color: #ffffff;
      background: #ff3366;
      padding: 2px 8px;
      border-radius: 4px;
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 44px;
      height: 44px;
      line-height: 44px;
      border-radius: 50%;
      background: var(--accent-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.2rem;
      margin: 0 auto 16px;
    }

    .step-card h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Comparison Review Table */
    .review-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .review-score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #4f46e5 0%, #7928ca 100%);
      color: #ffffff;
      padding: 20px 28px;
      border-radius: 12px;
      margin-bottom: 28px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-title {
      font-size: 1.25rem;
      font-weight: 800;
    }

    .score-stars {
      font-size: 1.2rem;
      color: #facc15;
    }

    .score-points {
      font-size: 2rem;
      font-weight: 900;
    }

    .score-points small {
      font-size: 1rem;
      font-weight: 600;
      opacity: 0.85;
    }

    .table-responsive {
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }

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

    .compare-table th, .compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

    .compare-table td.highlight {
      font-weight: 700;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.03);
    }

    /* Media Showcase */
    .media-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

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

    .media-card-body {
      padding: 16px 20px;
    }

    .media-card-body h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .media-card-body p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Testimonials (6 Required) */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: normal;
    }

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

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary);
    }

    .author-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
    }

    .author-info span {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ Accordion */
    .faq-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 16px 20px;
      font-weight: 700;
      font-size: 0.95rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
      transition: background 0.2s;
    }

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

    .faq-answer {
      padding: 0 20px 16px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
      display: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.2s;
    }

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

    /* Demand Matching Form & Contact */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #f8fafc;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px;
      background: var(--accent-gradient);
      color: #ffffff;
      border: none;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(255, 51, 102, 0.3);
      transition: opacity 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.95;
    }

    .contact-info-panel {
      background: #f8fafc;
      border-radius: 10px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-details h4 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .contact-list {
      list-style: none;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .contact-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .qr-box {
      margin-top: 16px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .qr-box img {
      width: 100px;
      height: 100px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .qr-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Agency & Partner Area */
    .agency-banner {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 40px;
      text-align: center;
    }

    .agency-banner h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .agency-banner p {
      font-size: 1rem;
      color: #cbd5e1;
      max-width: 680px;
      margin: 0 auto 24px;
    }

    /* Articles & Links */
    .articles-section {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .links-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 12px;
    }

    .links-cloud a {
      color: var(--primary);
      text-decoration: none;
      background: #eff6ff;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      transition: background 0.2s;
    }

    .links-cloud a:hover {
      background: #dbeafe;
    }

    /* Footer */
    footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      margin-top: auto;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 20px;
      text-align: center;
    }

    .footer-links {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 600;
    }

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

    .copyright {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* Floating Customer Service */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--accent-gradient);
      color: #ffffff;
      padding: 12px 18px;
      border-radius: 9999px;
      box-shadow: 0 8px 25px rgba(255, 51, 102, 0.4);
      cursor: pointer;
      font-weight: 700;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: transform 0.2s ease;
    }

    .floating-kefu:hover {
      transform: scale(1.05);
    }

    /* Responsive Adjustments */
    @media (max-width: 992px) {
      .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .faq-list {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .media-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .steps-container {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
      }
    }