/* CSS Reset & Base Vars */
        :root {
            --primary-color: #6366f1;
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
            --secondary-gradient: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
            --accent-gradient: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 100%);
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --text-main: #0f172a;
            --text-muted: #475569;
            --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-md: 0 10px 25px -5px rgba(99, 102, 241, 0.1), 0 8px 10px -6px rgba(99, 102, 241, 0.05);
            --shadow-lg: 0 20px 35px -10px rgba(0, 0, 0, 0.08);
            --container-max: 1200px;
            --radius-lg: 16px;
            --radius-md: 10px;
        }

        * {
            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;
            width: 100%;
        }

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

        /* Navigation Bar */
        .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);
        }

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

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: var(--text-main);
            font-weight: 700;
            font-size: 1.25rem;
        }

        .brand-logo img.ai-page-logo {
            height: 40px;
            width: auto;
            display: block;
        }

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

        .nav-links li a {
            display: inline-block;
            padding: 8px 14px;
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.3s, background-color 0.3s;
            border-radius: 6px;
        }

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

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
            cursor: pointer;
            border: none;
            font-size: 0.95rem;
        }

        .btn-primary {
            background: var(--primary-gradient);
            color: #ffffff !important;
            box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
        }

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

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

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

        /* Hero Section (Strictly NO images) */
        .hero-section {
            background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 100%);
            padding: 80px 0 60px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary-color);
            border: 1px solid rgba(99, 102, 241, 0.2);
            border-radius: 20px;
            font-size: 0.88rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .hero-title {
            font-size: 2.3rem;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 20px;
            color: var(--text-main);
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 35px auto;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 50px;
            flex-wrap: wrap;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .stat-card {
            background: #ffffff;
            padding: 24px 16px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform 0.3s;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }

        .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.88rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* Section Commons */
        .section-padding {
            padding: 70px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-subtitle {
            text-transform: uppercase;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--primary-color);
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto;
        }

        /* Grid System */
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

        /* Feature Card */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 30px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: rgba(99, 102, 241, 0.3);
        }

        .card-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            background: var(--primary-gradient);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-size: 1.4rem;
            margin-bottom: 20px;
            font-weight: bold;
        }

        .card-title {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }

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

        /* Platform Intro Section */
        .intro-box {
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 40px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .tag {
            padding: 6px 14px;
            background: #f1f5f9;
            color: var(--text-muted);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid #e2e8f0;
        }

        .tag-highlight {
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary-color);
            border-color: rgba(99, 102, 241, 0.2);
            font-weight: 600;
        }

        /* Media Showcase (Images allowed here) */
        .showcase-card {
            background: #ffffff;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .showcase-img-wrap {
            width: 100%;
            overflow: hidden;
            background: #f1f5f9;
        }

        .showcase-img-wrap img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            display: block;
            transition: transform 0.4s;
        }

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

        .showcase-body {
            padding: 20px;
        }

        /* Review / Comparison Section */
        .rating-badge {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #fff7ed;
            border: 1px solid #ffedd5;
            padding: 12px 24px;
            border-radius: 30px;
            margin-bottom: 25px;
        }

        .stars {
            color: #f59e0b;
            font-size: 1.2rem;
            letter-spacing: 2px;
        }

        .score {
            font-weight: 800;
            font-size: 1.3rem;
            color: #c2410c;
        }

        .compare-table-wrap {
            overflow-x: auto;
            background: #ffffff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 650px;
        }

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

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

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

        .compare-highlight {
            background: rgba(99, 102, 241, 0.03);
            font-weight: 600;
            color: var(--primary-color);
        }

        /* Token Price Table */
        .price-card {
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 24px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            text-align: center;
        }

        .price-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .price-val {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        /* Review Cards */
        .review-card {
            background: #ffffff;
            padding: 25px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .review-header {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .avatar-placeholder {
            width: 46px;
            height: 46px;
            border-radius: 50%;
            background: var(--secondary-gradient);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .reviewer-name {
            font-weight: 700;
            font-size: 1rem;
        }

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

        /* FAQ Accordion */
        .faq-item {
            background: #ffffff;
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            border: 1px solid var(--border-color);
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            background: #ffffff;
            transition: background-color 0.2s;
        }

        .faq-question:hover {
            background: #f8fafc;
        }

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            color: var(--text-muted);
            font-size: 0.93rem;
            line-height: 1.6;
        }

        .faq-item.active .faq-answer {
            padding: 0 24px 18px 24px;
            max-height: 200px;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        .faq-icon {
            transition: transform 0.3s;
            font-size: 0.9rem;
            color: var(--primary-color);
        }

        /* Contact & Form Section */
        .contact-box {
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 40px;
            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;
            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-md);
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }

        .qr-card {
            text-align: center;
            padding: 20px;
            background: #f8fafc;
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

        .qr-card img {
            max-width: 160px;
            height: auto;
            border-radius: 8px;
            margin-bottom: 10px;
        }

        /* Footer */
        .footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

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

        .footer-title {
            color: #ffffff;
            font-weight: 700;
            margin-bottom: 20px;
            font-size: 1rem;
        }

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

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

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
        }

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

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 15px;
        }

        .friend-links a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.85rem;
            background: rgba(255,255,255,0.05);
            padding: 4px 10px;
            border-radius: 4px;
            transition: background 0.2s, color 0.2s;
        }

        .friend-links a:hover {
            background: rgba(255,255,255,0.15);
            color: #ffffff;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 25px;
            text-align: center;
            color: #64748b;
            font-size: 0.85rem;
        }

        /* Floating Floating Service Button */
        .float-kefu {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background: var(--primary-gradient);
            color: #ffffff;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
            text-decoration: none;
            font-weight: 700;
            font-size: 0.8rem;
            text-align: center;
            line-height: 1.2;
            transition: transform 0.3s;
        }

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

        /* Article Link List */
        .article-list {
            list-style: none;
        }

        .article-list li {
            padding: 12px 0;
            border-bottom: 1px dashed var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .article-list a {
            color: var(--text-main);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
        }

        .article-list a:hover {
            color: var(--primary-color);
        }

        /* Responsive Breakpoints */
        @media (max-width: 992px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .grid-3 { grid-template-columns: repeat(2, 1fr); }
            .hero-stats { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px 0;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
            }

            .nav-links.active {
                display: flex;
            }

            .mobile-menu-btn {
                display: block;
            }

            .grid-2, .grid-3, .grid-4 {
                grid-template-columns: 1fr;
            }

            .hero-title {
                font-size: 1.6rem;
            }

            .hero-stats {
                grid-template-columns: 1fr 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }
        }