/* === Standard Vivid Light Theme & Grid System === */
        :root {
            --primary: #2563EB;
            --primary-vivid: #0284C7;
            --primary-accent: #06B6D4;
            --secondary: #7C3AED;
            --bg-body: #F8FAFC;
            --bg-card: #FFFFFF;
            --bg-alt: #EDF2F7;
            --text-main: #0F172A;
            --text-muted: #475569;
            --text-light: #64748B;
            --border-color: #E2E8F0;
            --shadow-sm: 0 2px 8px rgba(37, 99, 235, 0.05);
            --shadow-md: 0 10px 25px -5px rgba(37, 99, 235, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
            --shadow-lg: 0 20px 35px -10px rgba(37, 99, 235, 0.12);
            --radius: 12px;
            --transition: all 0.25s 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, sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            background: linear-gradient(180deg, #F0F9FF 0%, #F8FAFC 500px, #F8FAFC 100%);
        }

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

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

        /* Unified Layout Container */
        .container {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section-padding {
            padding: 70px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 45px;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.85rem;
            border-radius: 20px;
            margin-bottom: 12px;
            border: 1px solid rgba(37, 99, 235, 0.15);
        }

        .section-title {
            font-size: 2.2rem;
            color: var(--text-main);
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 720px;
            margin: 0 auto;
        }

        /* === Header / Navigation === */
        header.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);
            box-shadow: var(--shadow-sm);
        }

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

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

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

        .brand-name {
            font-weight: 800;
            font-size: 1.3rem;
            background: linear-gradient(135deg, #1E40AF, #06B6D4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        nav.main-nav {
            display: flex;
            align-items: center;
            gap: 22px;
        }

        nav.main-nav a {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-main);
        }

        nav.main-nav a:hover {
            color: var(--primary);
        }

        .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: 8px;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            outline: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-accent));
            color: #FFFFFF !important;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
        }

        .btn-outline {
            background: #FFFFFF;
            border: 1.5px solid var(--primary);
            color: var(--primary) !important;
        }

        .btn-outline:hover {
            background: rgba(37, 99, 235, 0.05);
        }

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

        /* === Section 1: Hero (No Images Rule Strictly Applied) === */
        .hero-section {
            padding: 80px 0 60px 0;
            background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.12), rgba(248, 250, 252, 0) 70%);
            text-align: center;
        }

        .hero-badge-wrap {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(37, 99, 235, 0.2);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.88rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .hero-title {
            font-size: 2.6rem;
            font-weight: 900;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-title span {
            background: linear-gradient(135deg, #2563EB, #06B6D4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-description {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 36px auto;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 50px;
        }

        .hero-cta-btn-main {
            font-size: 1.05rem;
            padding: 14px 32px;
        }

        .hero-stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: var(--bg-card);
            padding: 28px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

        .stat-card-number {
            font-size: 2.1rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .stat-card-label {
            font-size: 0.9rem;
            color: var(--text-light);
            font-weight: 500;
        }

        /* === Generic Vivid Card & Grid Styles === */
        .card-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .card-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

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

        .vivid-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .card-icon-box {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 18px;
            font-weight: 700;
        }

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

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

        /* === Model Cloud Tags Component === */
        .model-tags-container {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            background: var(--bg-card);
            padding: 30px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .model-tag {
            background: #F1F5F9;
            color: var(--text-main);
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
            border: 1px solid #E2E8F0;
            transition: var(--transition);
        }

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

        .model-tag.highlight {
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
            color: var(--primary);
            border-color: rgba(37, 99, 235, 0.3);
        }

        /* === Section Media & Image Wrapper === */
        .media-image-container {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
            background: var(--bg-card);
        }

        .media-image-container img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
        }

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

        .process-step-card {
            background: var(--bg-card);
            padding: 22px 18px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            box-shadow: var(--shadow-sm);
        }

        .process-step-num {
            width: 32px;
            height: 32px;
            background: var(--primary);
            color: #FFFFFF;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            margin: 0 auto 12px auto;
            font-size: 0.9rem;
        }

        /* === Comparison Table Section === */
        .comparison-table-wrapper {
            overflow-x: auto;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

        .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: 0.95rem;
        }

        .comparison-table th {
            background: #F8FAFC;
            color: var(--text-main);
            font-weight: 700;
        }

        .comparison-table tr:hover {
            background: #F1F5F9;
        }

        .comparison-badge-score {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #FEF3C7;
            color: #D97706;
            padding: 6px 14px;
            border-radius: 20px;
            font-weight: 800;
            font-size: 1.1rem;
        }

        /* === Form Styles === */
        .form-card {
            background: var(--bg-card);
            padding: 36px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

        .form-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-group.full-width {
            grid-column: span 2;
        }

        .form-label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
        }

        .form-input, .form-select, .form-textarea {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.95rem;
            background: #FFFFFF;
            color: var(--text-main);
            outline: none;
            transition: var(--transition);
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }

        /* === FAQ Accordion Styles === */
        .faq-accordion {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 960px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .faq-header {
            padding: 18px 24px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            color: var(--text-main);
            user-select: none;
        }

        .faq-header:hover {
            color: var(--primary);
        }

        .faq-content {
            padding: 0 24px 20px 24px;
            font-size: 0.95rem;
            color: var(--text-muted);
            display: none;
            border-top: 1px solid #F1F5F9;
            padding-top: 16px;
        }

        .faq-item.active .faq-content {
            display: block;
        }

        .faq-icon {
            font-size: 1.2rem;
            transition: transform 0.2s;
        }

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

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

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }

        .review-avatar-text {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-accent));
            color: #FFFFFF;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .review-user-info h4 {
            font-size: 0.95rem;
            color: var(--text-main);
        }

        .review-user-info p {
            font-size: 0.8rem;
            color: var(--text-light);
        }

        /* === Article Links List === */
        .article-links-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .article-link-item {
            background: var(--bg-card);
            padding: 16px 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }

        /* === Footer === */
        footer.site-footer {
            background: #0F172A;
            color: #94A3B8;
            padding: 60px 0 30px 0;
            margin-top: 60px;
            border-top: 1fr solid #1E293B;
        }

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

        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 1.3rem;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .footer-col h4 {
            color: #FFFFFF;
            font-size: 1rem;
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 10px;
            font-size: 0.9rem;
        }

        .footer-col ul li a {
            color: #94A3B8;
        }

        .footer-col ul li a:hover {
            color: #FFFFFF;
        }

        .friendship-links-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .friendship-links-wrap a {
            color: #94A3B8;
            font-size: 0.85rem;
            background: #1E293B;
            padding: 4px 10px;
            border-radius: 4px;
        }

        .friendship-links-wrap a:hover {
            color: #FFFFFF;
            background: var(--primary);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            border-top: 1px solid #1E293B;
            font-size: 0.85rem;
            color: #64748B;
        }

        /* === Floating Service Widget === */
        .floating-kefu {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 12px;
            box-shadow: var(--shadow-lg);
            text-align: center;
            width: 140px;
        }

        .floating-kefu img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin-bottom: 6px;
        }

        .floating-kefu p {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--text-main);
        }

        /* Responsive Breakpoints */
        @media (max-width: 992px) {
            .hero-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid-3, .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
            nav.main-nav {
                display: none;
            }
            .mobile-menu-toggle {
                display: block;
            }
        }

        @media (max-width: 600px) {
            .hero-title {
                font-size: 1.8rem;
            }
            .card-grid-2, .card-grid-3, .card-grid-4, .hero-stats-grid, .process-steps-grid, .article-links-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .floating-kefu {
                display: none;
            }
        }