/* CSS Standard Reset & Colors (Corporate Crimson Red Theme) */
    :root {
      --primary-red: #d92626;
      --primary-red-hover: #b81c1c;
      --primary-red-light: #fff0f0;
      --dark-title: #111827;
      --dark-text: #374151;
      --light-text: #6b7280;
      --bg-warm-light: #fdfbfb;
      --bg-card: #ffffff;
      --border-color: #e5e7eb;
      --shadow-sm: 0 2px 8px rgba(217, 38, 38, 0.06);
      --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.08);
      --shadow-hover: 0 15px 30px rgba(217, 38, 38, 0.15);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-warm-light);
      color: var(--dark-text);
      line-height: 1.6;
    }

    body {
      width: 100%;
      overflow-x: hidden;
    }

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

    /* Typography */
    h1, h2, h3, h4 {
      color: var(--dark-title);
      font-weight: 700;
      line-height: 1.3;
    }

    a {
      color: var(--primary-red);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      color: var(--primary-red-hover);
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

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

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

    /* Mandatory rule: .nav-links gap must be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: inline-block;
      padding: 10px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--dark-title);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-red);
      background-color: var(--primary-red-light);
    }

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

    .btn-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary-red), #e63939);
      border: none;
      border-radius: 30px;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(217, 38, 38, 0.3);
      transition: all 0.3s ease;
    }

    .btn-cta:hover {
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(217, 38, 38, 0.4);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary-red);
      background-color: #ffffff;
      border: 1.5px solid var(--primary-red);
      border-radius: 30px;
      transition: all 0.3s ease;
    }

    .btn-outline:hover {
      background-color: var(--primary-red-light);
    }

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

    /* Section Styles */
    .section-padding {
      padding: 80px 0;
    }

    .section-bg-alt {
      background-color: #f7f8fa;
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-red);
      background-color: var(--primary-red-light);
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      color: var(--dark-title);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--light-text);
    }

    /* HERO SECTION - Strictly No Images */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(180deg, #fff5f5 0%, #ffffff 100%);
      border-bottom: 1px solid #fee2e2;
      text-align: center;
      position: relative;
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background-color: #ffffff;
      border: 1px solid #fca5a5;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary-red);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    /* H1 constrained within 20 chars */
    .hero-title {
      font-size: 40px;
      font-weight: 800;
      color: var(--dark-title);
      margin-bottom: 20px;
      line-height: 1.25;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--dark-text);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-features-list {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 30px;
      padding-top: 30px;
      border-top: 1px dashed #fca5a5;
    }

    .hero-feature-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark-title);
    }

    .hero-feature-icon {
      width: 20px;
      height: 20px;
      background-color: var(--primary-red);
      color: #ffffff;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
    }

    /* Metrics Grid */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -40px;
      position: relative;
      z-index: 10;
    }

    .metric-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      transition: transform 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-5px);
    }

    .metric-number {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary-red);
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--light-text);
      font-weight: 500;
    }

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

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

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

    .service-card {
      background-color: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: #fca5a5;
    }

    .service-card-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background-color: var(--primary-red-light);
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    .service-card p {
      font-size: 14.5px;
      color: var(--dark-text);
      flex-grow: 1;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .chip-tag {
      font-size: 12px;
      padding: 4px 10px;
      background-color: #f3f4f6;
      color: #4b5563;
      border-radius: 4px;
      font-weight: 500;
    }

    /* Models Cloud Section */
    .models-badge-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-badge {
      background-color: #ffffff;
      border: 1px solid #e5e7eb;
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--dark-title);
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      transition: all 0.2s ease;
    }

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

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

    .step-card {
      background-color: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px 20px;
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-number {
      width: 40px;
      height: 40px;
      background-color: var(--primary-red);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px auto;
    }

    /* Showcase Section with Images */
    .case-card {
      background-color: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background-color: #f3f4f6;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 14px;
      color: var(--light-text);
    }

    /* Comparison Table Component */
    .comparison-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 700px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 15px;
    }

    .comparison-table th {
      background-color: #fafafa;
      color: var(--dark-title);
      font-weight: 700;
    }

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

    .highlight-col {
      background-color: #fff9f9;
      font-weight: 600;
      color: var(--primary-red);
    }

    .rating-badge-large {
      display: inline-flex;
      align-items: center;
      gap: 15px;
      background-color: #ffffff;
      padding: 16px 28px;
      border-radius: var(--radius-md);
      border: 2px solid #fca5a5;
      box-shadow: var(--shadow-sm);
      margin-bottom: 25px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 22px;
    }

    .rating-score {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-red);
    }

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

    .review-text {
      font-size: 14.5px;
      color: var(--dark-text);
      margin-bottom: 20px;
      font-style: italic;
    }

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

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: var(--primary-red-light);
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .author-info h4 {
      font-size: 15px;
      color: var(--dark-title);
    }

    .author-info span {
      font-size: 12px;
      color: var(--light-text);
    }

    /* FAQ Accordion Component */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 16.5px;
      font-weight: 600;
      color: var(--dark-title);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background-color: #fafafa;
    }

    .faq-toggle-icon {
      font-size: 20px;
      color: var(--primary-red);
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: #fffdfd;
    }

    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      font-size: 14.5px;
      color: var(--dark-text);
      line-height: 1.7;
    }

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

    .faq-item.active .faq-answer {
      max-height: 300px;
    }

    /* Contact Form & Info Area */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background-color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }

    .contact-info-panel p {
      font-size: 15px;
      color: var(--dark-text);
      margin-bottom: 24px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 18px;
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      background-color: var(--primary-red-light);
      color: var(--primary-red);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      flex-shrink: 0;
    }

    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background-color: #fafafa;
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 4px;
      margin-bottom: 8px;
    }

    .qr-box span {
      font-size: 13px;
      display: block;
      color: var(--light-text);
      font-weight: 500;
    }

    /* Form Design */
    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark-title);
      margin-bottom: 6px;
    }

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

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary-red);
      box-shadow: 0 0 0 3px rgba(217, 38, 38, 0.1);
    }

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

    /* Articles / AI Encyclopedia */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      transition: all 0.25s ease;
    }

    .article-item-card:hover {
      border-color: var(--primary-red);
      transform: translateY(-3px);
    }

    .article-item-card h4 {
      font-size: 16px;
      margin-bottom: 10px;
    }

    .article-item-card p {
      font-size: 13.5px;
      color: var(--light-text);
      margin-bottom: 14px;
    }

    /* Footer Rules - High Readability & Explicit Dark Background */
    .site-footer {
      background-color: #111827;
      color: #e5e7eb;
      padding-top: 60px;
      padding-bottom: 30px;
      border-top: 4px solid var(--primary-red);
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 14px;
      color: #9ca3af;
      line-height: 1.6;
    }

    .footer-links-list {
      list-style: none;
    }

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

    .footer-links-list li a {
      color: #9ca3af;
      font-size: 14px;
    }

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

    .friend-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links-flex a {
      color: #9ca3af;
      font-size: 13px;
      background-color: #1f2937;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friend-links-flex a:hover {
      color: #ffffff;
      background-color: var(--primary-red);
    }

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
      color: #9ca3af;
    }

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

    .float-btn {
      width: 50px;
      height: 50px;
      background-color: var(--primary-red);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(217, 38, 38, 0.4);
      cursor: pointer;
      transition: all 0.3s ease;
      text-decoration: none;
      font-size: 12px;
      font-weight: 700;
      text-align: center;
      line-height: 1.2;
    }

    .float-btn:hover {
      transform: scale(1.1);
      color: #ffffff;
    }

    /* Responsive Adjustments */
    @media (max-width: 1024px) {
      .cards-grid-4, .metrics-grid, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background-color: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px;
      }
      .cards-grid-3, .cards-grid-2, .cards-grid-4, .articles-grid, .metrics-grid, .process-steps {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }