/* CSS Reset & Variables */
        :root {
            --primary: #6366f1;
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
            --secondary-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
            --accent-glow: radial-gradient(circle, rgba(99,102,241,0.15) 0%, rgba(255,255,255,0) 70%);
            --text-dark: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --border-color: #e2e8f0;
            --border-highlight: #cbd5e1;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.03);
            --shadow-md: 0 10px 25px -5px rgba(99,102,241,0.08);
            --shadow-hover: 0 20px 35px -10px rgba(99,102,241,0.18);
            --container-width: 1240px;
        }

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

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

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

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

        a:hover {
            opacity: 0.85;
        }

        /* Container Standard */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* Section Layout */
        section {
            padding: 80px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 50px auto;
        }

        .section-badge {
            display: inline-block;
            padding: 6px 16px;
            background: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(236,72,153,0.1) 100%);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.875rem;
            border-radius: 50px;
            margin-bottom: 14px;
            border: 1px solid rgba(99,102,241,0.2);
        }

        .section-title {
            font-size: 2.25rem;
            color: var(--text-dark);
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
        }

        /* Header Navigation */
        .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);
            transition: all 0.3s ease;
        }

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

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

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

        .brand-title-text {
            font-size: 1.25rem;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* Nav Links requirement: 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;
            color: var(--text-dark);
            font-weight: 600;
            font-size: 0.95rem;
            border-radius: var(--radius-sm);
        }

        .nav-links li a:hover,
        .nav-links li a.active {
            color: var(--primary);
            background: rgba(99,102,241,0.06);
        }

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

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
            text-align: center;
        }

        .btn-primary {
            background: var(--primary-gradient);
            color: #ffffff !important;
            box-shadow: 0 8px 20px rgba(99,102,241,0.25);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 25px rgba(99,102,241,0.35);
            opacity: 1;
        }

        .btn-secondary {
            background: #ffffff;
            color: var(--text-dark);
            border: 1px solid var(--border-color);
        }

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

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            cursor: pointer;
        }

        /* Hero Section (NO IMAGES PER INSTRUCTION) */
        .hero-section {
            padding: 90px 0 100px 0;
            background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
            position: relative;
            overflow: hidden;
        }

        .hero-glow {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 800px;
            height: 450px;
            background: var(--accent-glow);
            pointer-events: none;
        }

        .hero-content {
            text-align: center;
            max-width: 960px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .hero-h1 {
            font-size: 2.75rem;
            font-weight: 900;
            color: var(--text-dark);
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-h1 span {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.25rem;
            color: var(--text-body);
            margin-bottom: 36px;
            line-height: 1.7;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 18px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .hero-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 50px;
        }

        .hero-stat-card {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(8px);
            padding: 24px 16px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
            transition: all 0.3s ease;
        }

        .hero-stat-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
        }

        .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: 600;
        }

        /* Model Badge Cloud */
        .model-tags-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 30px;
        }

        .model-tag {
            background: #ffffff;
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-body);
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 5px rgba(0,0,0,0.02);
            transition: all 0.2s ease;
        }

        .model-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: scale(1.05);
        }

        /* Card Grid Layouts */
        .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;
        }

        /* Generic Feature Card */
        .feature-card {
            background: 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;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(99,102,241,0.3);
        }

        .card-icon {
            width: 54px;
            height: 54px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(236,72,153,0.1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: var(--primary);
        }

        .card-title {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
        }

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

        .card-badge {
            display: inline-block;
            align-self: flex-start;
            margin-top: 14px;
            font-size: 0.8rem;
            padding: 3px 10px;
            background: #f1f5f9;
            color: var(--primary);
            border-radius: 4px;
            font-weight: 600;
        }

        /* Image Containers */
        .img-container {
            width: 100%;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            background: #e2e8f0;
            margin-bottom: 20px;
        }

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

        .feature-card:hover .img-container img {
            transform: scale(1.03);
        }

        /* Comparison Section & Rating */
        .rating-box {
            background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
            border: 2px solid var(--primary);
            border-radius: var(--radius-lg);
            padding: 36px;
            margin-bottom: 40px;
            text-align: center;
            box-shadow: var(--shadow-md);
        }

        .rating-score {
            font-size: 3.5rem;
            font-weight: 900;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1;
            margin-bottom: 8px;
        }

        .rating-stars {
            color: #f59e0b;
            font-size: 1.5rem;
            margin-bottom: 12px;
        }

        .rating-desc {
            font-size: 1.05rem;
            color: var(--text-dark);
            font-weight: 600;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: #ffffff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

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

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

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

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

        .custom-table td.highlight {
            color: var(--primary);
            font-weight: 700;
            background: rgba(99,102,241,0.03);
        }

        /* Workflow Steps */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
            position: relative;
        }

        .step-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 16px;
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px auto;
        }

        /* Reviews Grid */
        .review-card {
            background: #ffffff;
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .reviewer-info {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 16px;
        }

        .avatar-placeholder {
            width: 46px;
            height: 46px;
            border-radius: 50%;
            background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }

        .reviewer-name {
            font-weight: 700;
            color: var(--text-dark);
        }

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

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

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

        .faq-question {
            padding: 20px 24px;
            font-weight: 700;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-question::after {
            content: "+";
            font-size: 1.4rem;
            color: var(--primary);
            transition: transform 0.3s ease;
        }

        .faq-item.active .faq-question::after {
            content: "−";
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background: #f8fafc;
            padding: 0 24px;
            color: var(--text-body);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            max-height: 250px;
            padding: 16px 24px 24px 24px;
            border-top: 1px solid var(--border-color);
        }

        /* Contact & Form */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .contact-info-box {
            background: #ffffff;
            padding: 36px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }

        .contact-item {
            margin-bottom: 20px;
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .contact-icon {
            font-size: 1.2rem;
            color: var(--primary);
            margin-top: 2px;
        }

        .form-box {
            background: #ffffff;
            padding: 36px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

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

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

        .form-input, .form-select, .form-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s ease;
            background: #f8fafc;
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary);
            background: #ffffff;
        }

        /* Articles list styling */
        .article-card-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .article-card {
            background: #ffffff;
            padding: 20px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .article-card:hover {
            border-color: var(--primary);
            transform: translateY(-4px);
        }

        /* Footer requirement & align */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            border-top: 1px solid #1e293b;
        }

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

        .footer-col h4 {
            color: #ffffff;
            font-size: 1.1rem;
            margin-bottom: 20px;
            font-weight: 700;
        }

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

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

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

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

        .friend-links-area {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            margin-top: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }

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

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

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
        }

        /* Floating customer service */
        .floating-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-gradient);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 20px rgba(99,102,241,0.4);
            cursor: pointer;
            font-size: 1.2rem;
            transition: transform 0.2s ease;
        }

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

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .grid-4, .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3, .article-card-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 76px;
                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;
            }
            .hero-h1 {
                font-size: 2rem;
            }
            .grid-3, .grid-2, .grid-4, .contact-grid, .article-card-list, .process-steps {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }