/* Global CSS Reset & Setup */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    :root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent-pink: #ec4899;
      --accent-amber: #f59e0b;
      --accent-green: #10b981;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 25px rgba(79, 70, 229, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* Section Styling */
    section {
      padding: 80px 0;
      position: relative;
    }
    
    .section-header {
      text-align: center;
      margin-bottom: 50px;
    }
    
    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, rgba(79,70,229,0.1) 0%, rgba(6,182,212,0.1) 100%);
      color: var(--primary);
      font-weight: 600;
      font-size: 0.875rem;
      border-radius: 50px;
      margin-bottom: 12px;
      border: 1px solid rgba(79,70,229,0.2);
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      max-width: 750px;
      margin: 0 auto;
    }

    /* Vibrant Color Accents (斑斓彩调风) */
    .gradient-text {
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 50%, #ec4899 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* Header Nav Rules */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .ai-page-home-link {
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      background-color: var(--bg-alt);
    }
    .ai-page-home-link:hover {
      background-color: var(--primary);
      color: #fff;
    }

    /* Strict Rule: .nav-links gap MUST BE 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li {
      position: relative;
    }

    .nav-links a {
      display: block;
      padding: 10px 14px;
      font-size: 0.935rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: rgba(79,70,229,0.06);
    }

    .nav-cta-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff !important;
      font-weight: 600;
      border-radius: 50px;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      transition: var(--transition);
    }
    .nav-cta-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 5px;
    }

    /* Hero Section - STRICT NO IMAGES RULE */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.05) 50%, rgba(236, 72, 153, 0.05) 100%), var(--bg-main);
      padding: 100px 0 80px;
      text-align: center;
    }

    .hero-content {
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      border-radius: 50px;
      background: #ffffff;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }

    .hero-description {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 60px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: var(--transition);
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
      color: #ffffff;
      box-shadow: var(--shadow-lg);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(79, 70, 229, 0.35);
      color: #ffffff;
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--secondary) 0%, #0891b2 100%);
      color: #ffffff;
      box-shadow: 0 8px 20px rgba(6, 182, 212, 0.25);
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(79, 70, 229, 0.04);
    }

    /* Stats Grid */
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(79, 70, 229, 0.3);
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Model Cloud / Tag Cloud */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      padding: 8px 16px;
      border-radius: 50px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.05);
    }

    /* Feature Cards (Matrix Style) */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(79, 70, 229, 0.3);
    }

    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .card-icon.purple { background: linear-gradient(135deg, #4f46e5, #7c3aed); }
    .card-icon.cyan { background: linear-gradient(135deg, #06b6d4, #0891b2); }
    .card-icon.pink { background: linear-gradient(135deg, #ec4899, #db2777); }
    .card-icon.amber { background: linear-gradient(135deg, #f59e0b, #d97706); }
    .card-icon.green { background: linear-gradient(135deg, #10b981, #059669); }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Comparison Table Styling */
    .comparison-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(79,70,229,0.08), rgba(6,182,212,0.08));
      padding: 20px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      border: 1px solid rgba(79,70,229,0.15);
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .score-num {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary);
    }

    .stars {
      color: #f59e0b;
      font-size: 1.4rem;
    }

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

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .comp-table th {
      background-color: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .comp-table tr.highlight {
      background-color: rgba(79,70,229,0.03);
      font-weight: 600;
    }

    .badge-check {
      display: inline-block;
      padding: 4px 10px;
      border-radius: 20px;
      background: rgba(16, 185, 129, 0.15);
      color: #059669;
      font-weight: 700;
      font-size: 0.85rem;
    }

    /* FAQ Accordion */
    .faq-grid {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 900px;
      margin: 0 auto;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: '+';
      font-size: 1.5rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: var(--bg-main);
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 20px 24px;
      max-height: 300px;
    }

    /* Testimonials / Reviews */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-style: italic;
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 0.95rem;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* Form Styling */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 700px;
      margin: 0 auto;
    }

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

    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background-color: var(--bg-main);
      color: var(--text-main);
      transition: var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
      background-color: #ffffff;
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* Contact Details Grid */
    .contact-info-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }

    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius-md);
      text-align: center;
    }
    
    .contact-qr {
      width: 140px;
      height: 140px;
      margin: 0 auto 12px;
      border: 1px solid var(--border-color);
      padding: 6px;
      border-radius: var(--radius-sm);
      background: #fff;
    }

    /* Footer Layout */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h3 {
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links a {
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
    }
    .friend-links a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 30px;
      text-align: center;
      font-size: 0.85rem;
    }

    /* Dynamic Float CTA */
    .float-widget {
      position: fixed;
      bottom: 30px;
      right: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0,0,0,0.2);
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition);
      border: none;
    }
    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-hover);
    }

    /* Process Flow */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
    }

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

    .step-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: rgba(79, 70, 229, 0.15);
      position: absolute;
      top: 10px;
      right: 15px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    /* Media Queries */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.25rem; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-btn { display: block; }
    }

    @media (max-width: 640px) {
      section { padding: 50px 0; }
      .hero-title { font-size: 1.75rem; }
      .section-title { font-size: 1.6rem; }
      .form-wrapper { padding: 24px; }
    }