:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --secondary: #06b6d4;
      --accent: #ec4899;
      --accent-warm: #f59e0b;
      --text-main: #1e293b;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
      --shadow-hover: 0 20px 30px -10px rgba(79, 70, 229, 0.16);
      --container-max: 1200px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    .header-nav {
      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: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: #eef2ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      border-color: #cbd5e1;
      background: #ffffff;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
      padding: 6px;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 10% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 40%),
                  linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #eef2ff;
      border: 1px solid #c7d2fe;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(120deg, #4f46e5, #06b6d4, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    /* Sections Shared */
    .section-wrap {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      margin-bottom: 10px;
      display: inline-block;
      background: rgba(79, 70, 229, 0.08);
      padding: 4px 12px;
      border-radius: 4px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #c7d2fe;
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #eef2ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #0f172a;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Model Tags Banner */
    .models-marquee-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 30px;
      border-radius: var(--radius-lg);
      margin-bottom: 30px;
      box-shadow: var(--shadow-sm);
    }

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-pill {
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      background: #f1f5f9;
      padding: 6px 14px;
      border-radius: 20px;
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      background: #e0e7ff;
      color: var(--primary);
      border-color: #c7d2fe;
    }

    /* Comparison Table Component */
    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      margin-bottom: 24px;
    }

    .score-banner {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      padding: 24px 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-banner-left h3 {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .score-banner-left p {
      font-size: 0.9rem;
      opacity: 0.85;
    }

    .score-badge {
      background: rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(8px);
      padding: 10px 24px;
      border-radius: 50px;
      display: flex;
      align-items: center;
      gap: 12px;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .score-num {
      font-size: 2rem;
      font-weight: 900;
      color: #fbbf24;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .custom-table th,
    .custom-table td {
      padding: 16px 22px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.93rem;
    }

    .custom-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #334155;
    }

    .custom-table tr:last-child td {
      border-bottom: none;
    }

    .custom-table td.highlight {
      background: rgba(79, 70, 229, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

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

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

    .step-badge {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 800;
      color: var(--accent);
      background: #fdf2f8;
      padding: 4px 10px;
      border-radius: 6px;
      margin-bottom: 12px;
    }

    .step-item h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* Gallery / Media Section */
    .media-card-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .media-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-item:hover .media-img-wrap img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
    }

    .media-info h4 {
      font-size: 1.1rem;
      color: #0f172a;
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

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

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

    .quote-icon {
      font-size: 2rem;
      color: #cbd5e1;
      line-height: 1;
      margin-bottom: 12px;
    }

    .testimonial-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

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

    .user-avatar-initial {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-meta h5 {
      font-size: 0.95rem;
      color: #0f172a;
      font-weight: 700;
    }

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

    /* FAQ Section */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-accordion-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.65;
      padding: 0 24px;
      border-top: 1px solid transparent;
    }

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

    .faq-accordion-item.active .faq-answer {
      max-height: 200px;
      padding: 18px 24px;
      border-top-color: var(--border-color);
    }

    /* Contact & Form */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-col h3 {
      font-size: 1.5rem;
      color: #0f172a;
      margin-bottom: 16px;
    }

    .contact-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .contact-meta-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
      font-size: 0.95rem;
      color: #334155;
    }

    .contact-qr-box {
      margin-top: 24px;
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 16px;
      border: 1px solid var(--border-color);
    }

    .contact-qr-box img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      object-fit: cover;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }

    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    /* Articles & Friendly links */
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 24px;
    }

    .article-tag-item {
      background: #f1f5f9;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      color: var(--text-muted);
      border: 1px solid var(--border-color);
    }

    .article-tag-item:hover {
      color: var(--primary);
      background: #eef2ff;
      border-color: #c7d2fe;
    }

    /* Footer */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
      margin-top: 40px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
      font-weight: 600;
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

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

    .friendly-links-section {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friendly-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friendly-links-list a {
      color: #64748b;
      font-size: 0.85rem;
    }

    .friendly-links-list a:hover {
      color: #cbd5e1;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: #64748b;
    }

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

    /* Sticky Float Widget */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 20px;
      transition: all 0.25s ease;
      position: relative;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    .float-qr-pop {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--border-color);
      width: 140px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }

    .float-btn:hover .float-qr-pop {
      display: block;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-wrap {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
        gap: 0;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-actions {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .card-grid-3,
      .card-grid-4,
      .testimonial-grid,
      .media-card-grid,
      .contact-container {
        grid-template-columns: 1fr;
      }
      .steps-wrap {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 12px;
      }
      .stat-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }