/* CSS Reset & Base */
        :root {
            --primary: #2563eb;
            --primary-neon: #00f0ff;
            --secondary: #db2777;
            --secondary-neon: #ff007f;
            --accent: #7c3aed;
            --dark: #0f172a;
            --light: #f8fafc;
            --white: #ffffff;
            --gray-light: #f1f5f9;
            --gray-medium: #cbd5e1;
            --text-dark: #1e293b;
            --border-width: 3px;
        }

        * {
            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(--light);
            color: var(--text-dark);
        }

        body {
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Neo-Brutalism Contrast Style (撞色艳色风) */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 80px 0;
            border-bottom: var(--border-width) solid var(--dark);
            position: relative;
        }

        section:nth-child(even) {
            background-color: var(--white);
        }

        h1, h2, h3, h4 {
            color: var(--dark);
            font-weight: 900;
            line-height: 1.2;
        }

        .section-title {
            font-size: 2.5rem;
            margin-bottom: 20px;
            text-transform: uppercase;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 8px;
            background-color: var(--primary-neon);
            border: var(--border-width) solid var(--dark);
            z-index: -1;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: #64748b;
            margin-bottom: 50px;
            max-width: 700px;
        }

        /* Buttons & Interactions */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 700;
            text-decoration: none;
            color: var(--dark);
            background-color: var(--primary-neon);
            border: var(--border-width) solid var(--dark);
            box-shadow: 4px 4px 0px var(--dark);
            cursor: pointer;
            transition: all 0.2s ease;
        }

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

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

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

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

        /* Cards */
        .card {
            background-color: var(--white);
            border: var(--border-width) solid var(--dark);
            box-shadow: 6px 6px 0px var(--dark);
            padding: 30px;
            transition: all 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 10px 10px 0px var(--dark);
        }

        /* Navigation */
        header {
            background-color: var(--white);
            border-bottom: var(--border-width) solid var(--dark);
            position: sticky;
            top: 0;
            z-index: 100;
        }

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

        .nav-logo {
            display: flex;
            align-items: center;
        }

        .nav-logo img {
            max-height: 50px;
        }

        .nav-menu {
            display: flex;
            list-style: none;
        }

        .nav-link {
            text-decoration: none;
            color: var(--dark);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 8px 12px;
            border: 2px solid transparent;
            transition: all 0.2s;
        }

        .nav-link:hover {
            background-color: var(--primary-neon);
            border-color: var(--dark);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
        }

        /* Hero (No Image Allowed) */
        .hero {
            background: radial-gradient(circle at 10% 20%, rgba(0, 240, 255, 0.1) 0%, rgba(255, 0, 127, 0.05) 90%);
            padding: 100px 0;
            text-align: center;
            position: relative;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: radial-gradient(var(--dark) 1px, transparent 1px);
            background-size: 20px 20px;
            opacity: 0.05;
            pointer-events: none;
        }

        .hero-tag {
            display: inline-block;
            background-color: var(--secondary-neon);
            color: var(--white);
            padding: 6px 16px;
            font-weight: 800;
            border: 2px solid var(--dark);
            margin-bottom: 20px;
            transform: rotate(-1deg);
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 24px;
            text-shadow: 2px 2px 0px var(--primary-neon);
        }

        .hero-desc {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 40px;
            color: #475569;
        }

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

        /* Stats Cards */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: -50px;
            position: relative;
            z-index: 10;
        }

        .stat-card {
            background-color: var(--white);
            border: var(--border-width) solid var(--dark);
            box-shadow: 6px 6px 0px var(--dark);
            padding: 24px;
            text-align: center;
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--secondary);
            margin-bottom: 8px;
        }

        .stat-label {
            font-weight: 700;
            font-size: 0.95rem;
        }

        /* Platform Badges */
        .badge-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 30px;
        }

        .badge-item {
            background-color: var(--white);
            border: 2px solid var(--dark);
            padding: 8px 16px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 3px 3px 0px var(--dark);
            transition: all 0.2s;
        }

        .badge-item:hover {
            background-color: var(--primary-neon);
            transform: translate(-1px, -1px);
            box-shadow: 4px 4px 0px var(--dark);
        }

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

        .service-card h3 {
            margin-bottom: 12px;
            font-size: 1.3rem;
            color: var(--primary);
        }

        /* Standardized workflow / timeline */
        .timeline {
            position: relative;
            margin: 40px 0;
            padding-left: 30px;
            border-left: var(--border-width) dashed var(--dark);
        }

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

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -41px;
            top: 5px;
            width: 20px;
            height: 20px;
            background-color: var(--primary-neon);
            border: var(--border-width) solid var(--dark);
            border-radius: 50%;
        }

        .timeline-step {
            display: inline-block;
            background-color: var(--dark);
            color: var(--white);
            padding: 2px 8px;
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        /* Comparison Table */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border: var(--border-width) solid var(--dark);
            box-shadow: 6px 6px 0px var(--dark);
            margin: 30px 0;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            background-color: var(--white);
        }

        .compare-table th, .compare-table td {
            padding: 16px;
            border: 1px solid var(--gray-medium);
        }

        .compare-table th {
            background-color: var(--dark);
            color: var(--white);
            font-weight: 800;
        }

        .compare-table tr:nth-child(even) {
            background-color: var(--gray-light);
        }

        .compare-table .highlight-row {
            background-color: rgba(0, 240, 255, 0.1) !important;
            font-weight: 700;
        }

        /* FAQ Accordion */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            border: var(--border-width) solid var(--dark);
            background-color: var(--white);
            box-shadow: 4px 4px 0px var(--dark);
        }

        .faq-question {
            padding: 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            font-size: 1.1rem;
            user-select: none;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: 900;
            transition: transform 0.2s;
        }

        .faq-item.active .faq-question::after {
            content: '-';
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding: 0 20px;
            background-color: var(--gray-light);
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 20px;
            border-top: 2px solid var(--dark);
        }

        /* Review Grid */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .review-card {
            border-top: 10px solid var(--secondary-neon);
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
        }

        .review-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background-color: var(--primary-neon);
            border: 2px solid var(--dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
        }

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

        .case-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-bottom: var(--border-width) solid var(--dark);
        }

        /* Form */
        .form-container {
            max-width: 600px;
            margin: 0 auto;
            background-color: var(--white);
            border: var(--border-width) solid var(--dark);
            box-shadow: 8px 8px 0px var(--dark);
            padding: 40px;
        }

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

        .form-group label {
            display: block;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 2px solid var(--dark);
            font-size: 1rem;
            background-color: var(--gray-light);
            outline: none;
            transition: border-color 0.2s;
        }

        .form-control:focus {
            border-color: var(--primary-neon);
            background-color: var(--white);
        }

        /* Floating Widgets */
        .floating-widgets {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 15px;
            z-index: 1000;
        }

        .widget-btn {
            width: 55px;
            height: 55px;
            background-color: var(--white);
            border: 3px solid var(--dark);
            box-shadow: 3px 3px 0px var(--dark);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-weight: 900;
            text-decoration: none;
            color: var(--dark);
            transition: all 0.2s;
            position: relative;
        }

        .widget-btn:hover {
            transform: translate(-2px, -2px);
            box-shadow: 5px 5px 0px var(--dark);
            background-color: var(--primary-neon);
        }

        .qr-popup {
            display: none;
            position: absolute;
            bottom: 70px;
            right: 0;
            background-color: var(--white);
            border: 3px solid var(--dark);
            padding: 15px;
            box-shadow: 5px 5px 0px var(--dark);
            text-align: center;
            width: 180px;
        }

        .qr-popup img {
            width: 130px;
            height: 130px;
            object-fit: cover;
        }

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

        /* Footer */
        footer {
            background-color: var(--dark);
            color: var(--white);
            padding: 60px 0 30px;
            border-top: var(--border-width) solid var(--dark);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--primary-neon);
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

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

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

        .footer-col a {
            color: var(--gray-medium);
            text-decoration: none;
            transition: color 0.2s;
        }

        .footer-col a:hover {
            color: var(--secondary-neon);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.9rem;
        }

        /* Extra elements */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .price-card {
            text-align: center;
        }

        .price-val {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--secondary-neon);
            margin: 15px 0;
        }

        .trouble-checker {
            background-color: var(--gray-light);
            border: var(--border-width) solid var(--dark);
            padding: 30px;
            margin-top: 35px;
        }

        .checker-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 80px;
                left: 0;
                width: 100%;
                background-color: var(--white);
                border-bottom: var(--border-width) solid var(--dark);
                padding: 20px;
                gap: 15px;
            }

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

            .nav-toggle {
                display: block;
            }
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 2rem;
            }

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

            .stats-grid {
                margin-top: 20px;
            }
        }