/* Base Styling & Design Tokens */
        :root {
            --primary: #0f4c81;
            --primary-light: #1d63b8;
            --primary-dark: #0a3358;
            --accent: #0284c7;
            --accent-light: #38bdf8;
            --text-main: #0f172a;
            --text-muted: #475569;
            --bg-page: #f8fafc;
            --bg-card: #ffffff;
            --border-color: #e2e8f0;
            --shadow-sm: 0 2px 4px rgba(15, 76, 129, 0.05);
            --shadow-md: 0 10px 25px -5px rgba(15, 76, 129, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 20px 30px -10px rgba(15, 76, 129, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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;
            color: var(--text-main);
            background-color: var(--bg-page);
            line-height: 1.6;
        }

        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }

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

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

        /* Header & Navigation */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: 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: 76px;
        }

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

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

        /* Navigation Links Specific Gap Rule */
        .nav-links {
            display: flex;
            gap: 0;
            list-style: none;
            align-items: center;
        }

        .nav-links li a {
            display: inline-block;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .nav-links li a:hover,
        .nav-links li a.active {
            color: var(--primary-light);
            background-color: rgba(29, 99, 184, 0.08);
        }

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

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

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 26px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
            gap: 8px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: #ffffff !important;
            box-shadow: 0 4px 14px rgba(15, 76, 129, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(15, 76, 129, 0.4);
            color: #ffffff !important;
        }

        .btn-outline {
            border-color: var(--primary-light);
            color: var(--primary-light);
            background: transparent;
        }

        .btn-outline:hover {
            background-color: rgba(29, 99, 184, 0.08);
            transform: translateY(-2px);
        }

        .btn-accent {
            background-color: var(--accent);
            color: #ffffff !important;
        }

        .btn-accent:hover {
            background-color: #0369a1;
            transform: translateY(-2px);
        }

        /* Hero Section - Explicitly NO IMAGES */
        .hero-section {
            background: radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.12) 0%, transparent 40%),
                        radial-gradient(circle at 10% 80%, rgba(15, 76, 129, 0.08) 0%, transparent 50%),
                        linear-gradient(180deg, #ffffff 0%, #f0f7ff 100%);
            padding: 80px 0 60px 0;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary-dark);
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .hero-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(15, 76, 129, 0.1);
            color: var(--primary);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .hero-subtitle {
            font-size: 17px;
            color: var(--text-muted);
            margin-bottom: 30px;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.8);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }

        .stat-number {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Section Global Standards */
        .section {
            padding: 80px 0;
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
        }

        .section-alt {
            background-color: #ffffff;
        }

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

        .section-title {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 14px;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 40px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            margin: 10px auto 0 auto;
            border-radius: 2px;
        }

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

        /* General Card Grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }

        .card-icon {
            width: 48px;
            height: 48px;
            background: rgba(15, 76, 129, 0.08);
            color: var(--primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: bold;
            margin-bottom: 20px;
        }

        .card-title {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .card-text {
            font-size: 14px;
            color: var(--text-muted);
            flex-grow: 1;
            line-height: 1.6;
        }

        /* Image Display Support */
        .media-container {
            margin-top: 30px;
            text-align: center;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            background: #fff;
        }

        .ai-page-image {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
        }

        /* Model Badges Tag Cloud */
        .badge-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 24px;
        }

        .badge-item {
            background: rgba(15, 76, 129, 0.06);
            color: var(--primary);
            border: 1px solid rgba(15, 76, 129, 0.15);
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
        }

        .badge-item:hover {
            background: var(--primary);
            color: #ffffff;
        }

        /* Comparison Table */
        .compare-card {
            background: #ffffff;
            border: 2px solid var(--primary-light);
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: var(--shadow-lg);
        }

        .compare-score-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: linear-gradient(135deg, rgba(15, 76, 129, 0.05), rgba(2, 132, 199, 0.1));
            padding: 20px 30px;
            border-radius: var(--radius-md);
            margin-bottom: 30px;
        }

        .rating-stars {
            color: #f59e0b;
            font-size: 24px;
            letter-spacing: 2px;
        }

        .score-badge {
            font-size: 26px;
            font-weight: 800;
            color: var(--primary);
        }

        .table-responsive {
            overflow-x: auto;
        }

        .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: 15px;
        }

        .custom-table th {
            background-color: rgba(248, 250, 252, 0.8);
            color: var(--text-main);
            font-weight: 700;
        }

        .custom-table tr:hover td {
            background-color: rgba(29, 99, 184, 0.03);
        }

        .highlight-cell {
            color: var(--primary);
            font-weight: 700;
            background-color: rgba(15, 76, 129, 0.03);
        }

        /* Step Process */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            position: relative;
        }

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

        .step-num {
            font-size: 36px;
            font-weight: 900;
            color: rgba(15, 76, 129, 0.15);
            margin-bottom: 10px;
        }

        .step-title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        /* Review Cards */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

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

        .review-user {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 14px;
        }

        .user-avatar {
            width: 46px;
            height: 46px;
            background: var(--primary);
            color: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 18px;
        }

        .user-info h4 {
            font-size: 16px;
            font-weight: 700;
        }

        .user-info p {
            font-size: 13px;
            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-md);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 20px 24px;
            font-size: 17px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #ffffff;
            user-select: none;
        }

        .faq-question::after {
            content: '+';
            font-size: 20px;
            font-weight: bold;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.open .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background: #f8fafc;
            padding: 0 24px;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 16px 24px 20px 24px;
            border-top: 1px solid var(--border-color);
        }

        /* Form Block */
        .form-container {
            max-width: 700px;
            margin: 0 auto;
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-md);
        }

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

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            font-size: 15px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            background-color: #ffffff;
            transition: var(--transition);
            color: var(--text-main);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(29, 99, 184, 0.15);
        }

        /* Articles & Friendship Links Section */
        .article-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 16px;
            margin-top: 20px;
        }

        .article-link-card {
            background: #ffffff;
            padding: 18px 20px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

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

        .friendship-links {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            padding: 20px 0;
        }

        .friendship-links a {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 4px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .friendship-links a:hover {
            color: var(--primary);
            border-color: var(--primary-light);
        }

        /* Footer Alignment & Standards */
        .footer {
            background-color: #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-title {
            color: #ffffff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 20px;
        }

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

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

        .footer-links a {
            color: #94a3b8;
            font-size: 14px;
        }

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

        .qr-code-box {
            background: #ffffff;
            padding: 8px;
            border-radius: var(--radius-sm);
            display: inline-block;
            max-width: 130px;
        }

        .qr-code-box img {
            width: 100%;
            height: auto;
            display: block;
        }

        .footer-bottom {
            padding-top: 30px;
            border-top: 1px solid #1e293b;
            text-align: center;
            font-size: 14px;
        }

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

        .floating-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            cursor: pointer;
            border: none;
            font-size: 20px;
            transition: var(--transition);
        }

        .floating-btn:hover {
            transform: scale(1.1);
            background: var(--primary-light);
        }

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

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 76px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px 0;
                box-shadow: var(--shadow-md);
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.show {
                display: flex;
            }
            .nav-links li {
                width: 100%;
                text-align: center;
            }
            .hero-content h1 {
                font-size: 24px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .form-container {
                padding: 24px;
            }
        }