:root {
            --primary: #FFD23F;
            --secondary: #FF7096;
            --accent: #4EADF2;
            --accent-green: #38B000;
            --dark: #1A1A1A;
            --light: #FDFBF7;
            --gray-light: #F3EFE9;
            --border-width: 3px;
            --border: var(--border-width) solid var(--dark);
            --radius: 16px;
            --shadow: 6px 6px 0px var(--dark);
            --shadow-hover: 9px 9px 0px var(--dark);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", sans-serif;
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
            background-image: radial-gradient(var(--dark) 8%, transparent 8%);
            background-size: 24px 24px;
            background-color: #faf7f2;
        }

        /* Container Alignment */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Colorful Typography & Badges */
        h1, h2, h3, h4 {
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 16px;
        }

        .section-title {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: 48px;
            display: inline-block;
            background: var(--primary);
            padding: 8px 24px;
            border: var(--border);
            border-radius: 12px;
            box-shadow: var(--shadow);
            transform: rotate(-1deg);
        }

        .section-title-wrapper {
            text-align: center;
            margin-bottom: 40px;
        }

        .badge {
            display: inline-block;
            padding: 6px 16px;
            font-weight: bold;
            text-transform: uppercase;
            border: var(--border);
            border-radius: 30px;
            background-color: var(--secondary);
            color: var(--dark);
            box-shadow: 3px 3px 0px var(--dark);
            font-size: 0.85rem;
            margin-bottom: 12px;
        }

        /* Buttons (Graffiti/Brutalist Style) */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 28px;
            font-size: 1rem;
            font-weight: bold;
            text-decoration: none;
            color: var(--dark);
            background-color: var(--accent);
            border: var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            cursor: pointer;
            transition: all 0.15s ease-in-out;
        }

        .btn:hover {
            transform: translate(-3px, -3px);
            box-shadow: var(--shadow-hover);
        }

        .btn:active {
            transform: translate(2px, 2px);
            box-shadow: 2px 2px 0px var(--dark);
        }

        .btn-primary {
            background-color: var(--primary);
        }

        .btn-secondary {
            background-color: var(--secondary);
        }

        .btn-success {
            background-color: var(--accent-green);
            color: white;
        }

        /* Cards (Graffiti Style) */
        .card {
            background: #ffffff;
            border: var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 24px;
            transition: all 0.2s ease;
            position: relative;
        }

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

        /* Navigation */
        .header {
            background-color: #ffffff;
            border-bottom: var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

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

        .ai-page-logo {
            height: 48px;
            width: auto;
            border: 2px solid var(--dark);
            border-radius: 8px;
            padding: 4px;
            background: #fff;
        }

        .nav-links {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 6px 12px;
            border-radius: 8px;
            transition: all 0.15s;
        }

        .nav-links a:hover {
            background: var(--primary);
            border: 2px solid var(--dark);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: var(--border);
            border-radius: 8px;
            padding: 8px;
            cursor: pointer;
            font-weight: bold;
        }

        /* Hero Section (No Images!) */
        .hero {
            padding: 80px 0;
            background: linear-gradient(135deg, #FFE66D 0%, #FF6B6B 100%);
            border-bottom: var(--border);
            text-align: center;
            position: relative;
        }

        .hero-inner {
            max-width: 900px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 24px;
            color: var(--dark);
            text-shadow: 3px 3px 0px #fff;
            line-height: 1.1;
        }

        .hero p {
            font-size: 1.25rem;
            margin-bottom: 36px;
            color: var(--dark);
            font-weight: 600;
            background: rgba(255, 255, 255, 0.9);
            padding: 12px 24px;
            border: var(--border);
            border-radius: var(--radius);
            display: inline-block;
        }

        .hero-btns {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 48px;
        }

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

        .stat-card {
            background: #fff;
            border: var(--border);
            border-radius: var(--radius);
            padding: 16px;
            box-shadow: 4px 4px 0px var(--dark);
        }

        .stat-card .num {
            font-size: 2rem;
            font-weight: 900;
            color: var(--secondary);
        }

        /* Section Layout */
        .section {
            padding: 80px 0;
            border-bottom: var(--border);
        }

        /* Grid Frameworks */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 40px;
            align-items: center;
        }

        /* Services Specifics */
        .service-list-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .service-item {
            background: #fff;
            border: var(--border);
            border-radius: 12px;
            padding: 16px;
            font-weight: bold;
            text-align: center;
            box-shadow: 4px 4px 0px var(--dark);
        }

        /* Step Timeline */
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
        }

        .timeline-item {
            display: flex;
            margin-bottom: 40px;
            position: relative;
        }

        .timeline-num {
            background: var(--primary);
            border: var(--border);
            min-width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            font-size: 1.5rem;
            margin-right: 20px;
            box-shadow: 3px 3px 0px var(--dark);
        }

        .timeline-content {
            background: #fff;
            border: var(--border);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            flex-grow: 1;
        }

        /* Solutions */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        /* Comparison Table */
        .comparison-wrapper {
            overflow-x: auto;
            border: var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            background: #fff;
        }

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

        .comparison-table th, .comparison-table td {
            padding: 16px 20px;
            border-bottom: 2px solid var(--dark);
            font-weight: bold;
        }

        .comparison-table th {
            background-color: var(--primary);
            color: var(--dark);
        }

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

        .comparison-table tr:hover {
            background-color: var(--gray-light);
        }

        .score-highlight {
            font-size: 1.8rem;
            font-weight: 900;
            color: var(--secondary);
        }

        /* Case Studies (Images OK here) */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .case-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            border: var(--border);
            border-radius: 12px;
            margin-bottom: 16px;
        }

        /* Form styling */
        .form-card {
            max-width: 650px;
            margin: 0 auto;
            background: #fff;
        }

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

        .form-group label {
            display: block;
            font-weight: bold;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: var(--border);
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            background: var(--light);
        }

        .form-control:focus {
            outline: none;
            background: #fff;
            box-shadow: 0 0 0 3px var(--primary);
        }

        /* FAQ Accordion */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border: var(--border);
            border-radius: 12px;
            margin-bottom: 16px;
            background: #fff;
            overflow: hidden;
            box-shadow: 4px 4px 0px var(--dark);
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: bold;
            font-size: 1.1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--gray-light);
            user-select: none;
            transition: background-color 0.2s;
        }

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

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 0.95rem;
            background: #fff;
            border-top: 0 solid var(--dark);
        }

        .faq-item.active .faq-answer {
            padding: 18px 24px;
            max-height: 300px;
            border-top: 2px solid var(--dark);
        }

        .faq-icon::before {
            content: "+";
            font-size: 1.5rem;
            font-weight: bold;
        }

        .faq-item.active .faq-icon::before {
            content: "−";
        }

        /* Review Grid */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .review-card {
            background: #fff;
            border: var(--border);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
        }

        .user-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            border: var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        /* Articles & Wiki List */
        .articles-section {
            background: #fff;
            border: var(--border);
            border-radius: var(--radius);
            padding: 30px;
            box-shadow: var(--shadow);
            margin-bottom: 40px;
        }

        .articles-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .articles-list li {
            padding: 12px;
            border: 2px solid var(--dark);
            border-radius: 8px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--light);
            transition: all 0.2s;
        }

        .articles-list li:hover {
            transform: translateX(5px);
            background: var(--primary);
        }

        .articles-list a {
            text-decoration: none;
            color: var(--dark);
            font-weight: bold;
        }

        /* Footer & Friend Links */
        .footer {
            background: var(--dark);
            color: #ffffff;
            padding: 60px 0 30px 0;
            border-top: var(--border);
        }

        .footer a {
            color: var(--primary);
            text-decoration: none;
            font-weight: bold;
        }

        .footer a:hover {
            text-decoration: underline;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-links-group h4 {
            color: #fff;
            border-bottom: 2px solid var(--primary);
            padding-bottom: 8px;
            display: inline-block;
            margin-bottom: 16px;
        }

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

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

        .friendship-links {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 20px;
            text-align: center;
        }

        .friendship-links a {
            margin: 0 10px;
            display: inline-block;
        }

        /* Float QR Widget */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 56px;
            height: 56px;
            border: var(--border);
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 4px 4px 0px var(--dark);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
            position: relative;
        }

        .float-btn:hover {
            transform: translate(-2px, -2px);
            box-shadow: 6px 6px 0px var(--dark);
        }

        .float-qr-popup {
            display: none;
            position: absolute;
            bottom: 70px;
            right: 0;
            background: #fff;
            border: var(--border);
            border-radius: var(--radius);
            padding: 16px;
            box-shadow: var(--shadow);
            width: 200px;
            text-align: center;
        }

        .float-qr-popup img {
            width: 100%;
            border-radius: 8px;
            border: 1px solid var(--dark);
        }

        .float-btn:hover .float-qr-popup {
            display: block;
        }

        /* Network & Tags */
        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 30px;
        }

        .tag-item {
            background: var(--gray-light);
            border: 2px solid var(--dark);
            border-radius: 20px;
            padding: 6px 16px;
            font-weight: bold;
            font-size: 0.9rem;
            box-shadow: 3px 3px 0 var(--dark);
        }

        /* Responsive Breakpoints */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 80px;
                left: 0;
                width: 100%;
                background: #fff;
                border-bottom: var(--border);
                padding: 20px 0;
            }

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

            .nav-toggle {
                display: block;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

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

            .section-title {
                font-size: 1.8rem;
            }
        }