/* CSS reset & variables for Vibrant Chromatic Accent Style */
        :root {
            --primary: #4f46e5;
            --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
            --secondary: #ec4899;
            --accent-cyan: #06b6d4;
            --accent-amber: #f59e0b;
            --accent-green: #10b981;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --bg-alt: #f1f5f9;
            --text-main: #0f172a;
            --text-muted: #475569;
            --text-light: #64748b;
            --border-color: #e2e8f0;
            --shadow-sm: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
            --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --container-width: 1200px;
        }

        * {
            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-main);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

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

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

        /* Top Bar & Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-main);
        }
        .brand-logo img.ai-page-logo {
            max-height: 42px;
            width: auto;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            list-style: none;
        }
        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
        }
        .nav-link:hover {
            color: var(--primary);
            background-color: var(--bg-alt);
        }
        .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: 99px;
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
            color: #ffffff;
        }
        .btn-secondary {
            background-color: var(--bg-alt);
            color: var(--text-main);
            border: 1px solid var(--border-color);
        }
        .btn-secondary:hover {
            background-color: #e2e8f0;
            color: var(--text-main);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-main);
        }

        /* Section Layout Rules */
        .section-padding {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            max-width: 800px;
            margin: 0 auto 50px auto;
        }
        .section-tag {
            display: inline-block;
            padding: 4px 16px;
            background: linear-gradient(90deg, rgba(79,70,229,0.1) 0%, rgba(236,72,153,0.1) 100%);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 700;
            border-radius: 99px;
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
        }

        /* HERO SECTION - Strictly NO IMAGES */
        .hero-section {
            background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.08) 0%, rgba(236, 72, 153, 0.05) 90%), #ffffff;
            padding: 90px 0 70px 0;
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }
        .hero-badge-row {
            display: flex;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .hero-pill {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 99px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .hero-title {
            font-size: 2.6rem;
            font-weight: 900;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 860px;
            margin: 0 auto 35px auto;
        }
        .hero-cta-group {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 50px;
        }
        .btn-visit-official {
            background: linear-gradient(90deg, #10b981 0%, #059669 100%);
            color: #ffffff;
            font-size: 1.1rem;
            padding: 14px 36px;
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
        }
        .btn-visit-official:hover {
            transform: translateY(-2px);
            color: #ffffff;
            box-shadow: 0 8px 25px rgba(16, 185, 129, 0.45);
        }

        /* Stats Bar in Hero */
        .hero-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: #ffffff;
            padding: 30px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-lg);
            max-width: 1000px;
            margin: 0 auto;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 600;
            margin-top: 4px;
        }

        /* Generic Card Layouts */
        .cards-grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }
        .cards-grid-4 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 20px;
        }
        .card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(79, 70, 229, 0.3);
        }
        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, rgba(79,70,229,0.1) 0%, rgba(236,72,153,0.1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }
        .card-desc {
            font-size: 0.95rem;
            color: var(--text-muted);
        }

        /* Tag Cloud / Model Cloud */
        .models-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 30px;
        }
        .model-chip {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: 99px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
            transition: all 0.25s ease;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .model-chip:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: scale(1.05);
            box-shadow: var(--shadow-sm);
        }
        .model-chip::before {
            content: "•";
            color: var(--secondary);
            font-weight: bold;
        }

        /* Comparison Table */
        .eval-table-wrapper {
            overflow-x: auto;
            background: #ffffff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .eval-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }
        .eval-table th, .eval-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }
        .eval-table th {
            background-color: var(--bg-alt);
            color: var(--text-main);
            font-weight: 700;
        }
        .eval-table tr:hover {
            background-color: #fafafa;
        }
        .highlight-col {
            background-color: rgba(79, 70, 229, 0.04);
            font-weight: 600;
            color: var(--primary);
        }

        /* FAQ Accordion */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 20px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-main);
            user-select: none;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            font-size: 1.2rem;
            transition: transform 0.3s ease;
        }
        .faq-answer {
            padding: 0 20px 20px 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
            display: none;
            border-top: 1px solid #f1f5f9;
            margin-top: 10px;
            padding-top: 15px;
        }
        .faq-item.active .faq-answer {
            display: block;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }

        /* Reviews Grid */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 20px;
        }
        .review-card {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-sm);
        }
        .review-rating {
            color: var(--accent-amber);
            font-size: 1.1rem;
            margin-bottom: 12px;
        }
        .review-content {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            font-style: italic;
        }
        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .avatar-placeholder {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }
        .user-info .user-name {
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--text-main);
        }
        .user-info .user-title {
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* Contact & Form Section */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            background: #ffffff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 40px;
            box-shadow: var(--shadow-lg);
        }
        .form-group {
            margin-bottom: 18px;
        }
        .form-label {
            display: block;
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 6px;
            color: var(--text-main);
        }
        .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;
            color: var(--text-main);
            background-color: var(--bg-light);
            outline: none;
            transition: border-color 0.2s ease;
        }
        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary);
            background-color: #ffffff;
        }
        .contact-info-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 20px;
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }
        .contact-info-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-weight: bold;
        }

        /* Footer Rules - Explicit Contrast */
        .site-footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 30px;
            margin-bottom: 40px;
        }
        .footer-brand {
            color: #ffffff;
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-desc {
            font-size: 0.9rem;
            line-height: 1.6;
            color: #94a3b8;
            margin-bottom: 20px;
        }
        .footer-title {
            color: #ffffff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: #94a3b8;
            font-size: 0.9rem;
        }
        .footer-links a:hover {
            color: #38bdf8;
        }
        .friendship-links-box {
            border-top: 1px solid #1e293b;
            padding-top: 25px;
            margin-top: 30px;
        }
        .friendship-links-title {
            color: #cbd5e1;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .friendship-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        .friendship-links-list a {
            color: #64748b;
            font-size: 0.85rem;
        }
        .friendship-links-list a:hover {
            color: #38bdf8;
        }
        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 25px;
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
        }

        /* Floating Controls */
        .floating-service {
            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-color: var(--primary);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 1.2rem;
            border: none;
        }
        .float-btn:hover {
            transform: scale(1.1);
            background-color: var(--secondary);
        }

        /* Responsive Breakpoints */
        @media (max-width: 992px) {
            .hero-title { font-size: 2rem; }
            .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
            .contact-wrapper { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow-lg);
                border-bottom: 1px solid var(--border-color);
            }
            .nav-menu.active { display: flex; }
            .mobile-toggle { display: block; }
            .hero-stats-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .section-title { font-size: 1.75rem; }
        }