/* CSS Reset & Variable Design (Neo-brutalism / 多彩涂鸦风格) */
        :root {
            --bg: #f9f8f3;
            --text: #1a1a1a;
            --primary: #ff5e7e; /* 涂鸦粉红 */
            --secondary: #fee440; /* 涂鸦亮黄 */
            --tertiary: #00f5ff; /* 涂鸦亮蓝 */
            --success: #6bcb77; /* 涂鸦绿 */
            --dark: #0f0f0f;
            --white: #ffffff;
            --card-shadow: 6px 6px 0px #0f0f0f;
            --hover-shadow: 2px 2px 0px #0f0f0f;
            --border-width: 3px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 基础网格与排版系统 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

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

        /* 多彩涂鸦风格统一组件 */
        .neocard {
            background: var(--white);
            border: var(--border-width) solid var(--dark);
            border-radius: 16px;
            box-shadow: var(--card-shadow);
            padding: 30px;
            transition: all 0.2s ease;
            position: relative;
            overflow: hidden;
        }

        .neocard:hover {
            transform: translate(4px, 4px);
            box-shadow: var(--hover-shadow);
        }

        .neobutton {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            background-color: var(--secondary);
            color: var(--dark);
            font-weight: 800;
            text-decoration: none;
            border: var(--border-width) solid var(--dark);
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            transition: all 0.2s ease;
            cursor: pointer;
            font-size: 1rem;
        }

        .neobutton:hover {
            transform: translate(3px, 3px);
            box-shadow: var(--hover-shadow);
            background-color: var(--primary);
            color: var(--white);
        }

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

        .badge {
            display: inline-block;
            padding: 6px 12px;
            font-weight: 700;
            font-size: 0.85rem;
            border: 2px solid var(--dark);
            border-radius: 20px;
            background-color: var(--tertiary);
            color: var(--dark);
            margin-bottom: 12px;
        }

        /* 涂鸦风格装饰标题 */
        .section-title-wrap {
            margin-bottom: 50px;
            text-align: center;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 900;
            display: inline-block;
            background-color: var(--primary);
            color: var(--white);
            padding: 10px 20px;
            border: var(--border-width) solid var(--dark);
            transform: rotate(-1.5deg);
            box-shadow: 4px 4px 0px var(--dark);
            margin-bottom: 15px;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: #555;
            font-weight: 600;
            margin-top: 10px;
        }

        /* Header / Navigation */
        header {
            background-color: var(--white);
            border-bottom: var(--border-width) solid var(--dark);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 15px 0;
        }

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

        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .ai-page-logo {
            height: 45px;
            object-fit: contain;
        }

        .brand-name {
            font-size: 1.5rem;
            font-weight: 900;
            color: var(--dark);
        }

        nav {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .nav-menu {
            display: flex;
            gap: 15px;
            list-style: none;
        }

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

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

        .nav-toggle {
            display: none;
            background: none;
            border: var(--border-width) solid var(--dark);
            padding: 8px;
            border-radius: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            margin: 4px 0;
        }

        /* Hero Section (No Image Allowed) */
        .hero {
            background: radial-gradient(circle at 80% 20%, rgba(254, 228, 64, 0.4) 0%, rgba(255, 94, 126, 0.2) 50%, rgba(249, 248, 243, 1) 100%);
            padding: 100px 0;
            text-align: center;
        }

        .hero h1 {
            font-size: 3.5rem;
            font-weight: 900;
            line-height: 1.2;
            margin-bottom: 24px;
            color: var(--dark);
        }

        .hero-highlight {
            background-color: var(--secondary);
            padding: 2px 10px;
            border: 3px solid var(--dark);
            display: inline-block;
            transform: rotate(1deg);
            box-shadow: 4px 4px 0 var(--dark);
        }

        .hero-desc {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 40px;
            color: #333;
            font-weight: 600;
        }

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

        /* Stats Grid */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
            margin-top: -50px;
            position: relative;
            z-index: 10;
        }

        .stat-card {
            background-color: var(--tertiary);
            text-align: center;
            padding: 20px;
        }

        .stat-card:nth-child(2n) {
            background-color: var(--secondary);
        }

        .stat-card:nth-child(3n) {
            background-color: var(--primary);
            color: var(--white);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 900;
            margin-bottom: 5px;
        }

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

        /* General Section Grid styles */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

        /* About & Platform */
        .about-text {
            font-size: 1.1rem;
            color: #333;
        }

        .about-text p {
            margin-bottom: 20px;
        }

        .feature-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 25px;
        }

        .feature-tag {
            padding: 8px 16px;
            border: 2px solid var(--dark);
            background-color: var(--white);
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 2px 2px 0 var(--dark);
        }

        /* Services Capacity */
        .service-list {
            margin-top: 20px;
            list-style: none;
        }

        .service-list li {
            position: relative;
            padding-left: 30px;
            margin-bottom: 12px;
            font-weight: 700;
        }

        .service-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: 900;
            font-size: 1.2rem;
        }

        /* Pricing Table */
        .pricing-table-wrap {
            overflow-x: auto;
        }

        table.neo-table {
            width: 100%;
            border-collapse: collapse;
            border: var(--border-width) solid var(--dark);
            border-radius: 12px;
            background: var(--white);
            overflow: hidden;
            box-shadow: var(--card-shadow);
        }

        table.neo-table th, table.neo-table td {
            border: 2px solid var(--dark);
            padding: 15px;
            text-align: left;
            font-weight: 700;
        }

        table.neo-table th {
            background-color: var(--secondary);
            font-size: 1.1rem;
        }

        table.neo-table tr:nth-child(even) {
            background-color: #fafafa;
        }

        /* Process Timeline */
        .timeline {
            position: relative;
            padding-left: 30px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 10px;
            bottom: 10px;
            width: 4px;
            background-color: var(--dark);
        }

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

        .timeline-dot {
            position: absolute;
            left: -27px;
            top: 5px;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background-color: var(--primary);
            border: 3px solid var(--dark);
        }

        /* Evaluation Section */
        .score-box {
            background-color: var(--secondary);
            border: var(--border-width) solid var(--dark);
            border-radius: 16px;
            padding: 30px;
            text-align: center;
            box-shadow: var(--card-shadow);
        }

        .score-num {
            font-size: 4rem;
            font-weight: 900;
            color: var(--dark);
        }

        .stars {
            color: #ffb800;
            font-size: 1.8rem;
            margin: 10px 0;
        }

        /* Form styling */
        .neo-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group label {
            font-weight: 800;
            font-size: 0.95rem;
        }

        .form-control {
            border: var(--border-width) solid var(--dark);
            padding: 12px 16px;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            outline: none;
            background-color: var(--bg);
        }

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

        /* FAQ Accordion */
        .faq-item {
            border: var(--border-width) solid var(--dark);
            border-radius: 12px;
            margin-bottom: 15px;
            background-color: var(--white);
            overflow: hidden;
            box-shadow: 4px 4px 0 var(--dark);
        }

        .faq-trigger {
            width: 100%;
            padding: 20px;
            text-align: left;
            background: none;
            border: none;
            font-size: 1.1rem;
            font-weight: 800;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-content {
            padding: 0 20px 20px;
            display: none;
            font-weight: 600;
            color: #444;
            border-top: 2px solid var(--dark);
            margin-top: -5px;
            padding-top: 15px;
        }

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

        /* Cases & Images */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-img-wrap {
            border: 3px solid var(--dark);
            border-radius: 12px;
            overflow: hidden;
            aspect-ratio: 16/10;
            background-color: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Articles list */
        .articles-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .article-link-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px;
            border: 2px solid var(--dark);
            border-radius: 8px;
            background-color: var(--white);
            text-decoration: none;
            color: var(--dark);
            font-weight: 700;
            transition: all 0.2s;
        }

        .article-link-item:hover {
            background-color: var(--tertiary);
            transform: translateX(5px);
        }

        /* Floating Qr & Contact */
        .float-contact {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .float-btn {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            border: 3px solid var(--dark);
            background-color: var(--secondary);
            box-shadow: 4px 4px 0 var(--dark);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            position: relative;
        }

        .float-btn img {
            width: 30px;
            height: 30px;
        }

        .qr-popover {
            position: absolute;
            bottom: 75px;
            right: 0;
            background-color: var(--white);
            border: 3px solid var(--dark);
            border-radius: 12px;
            padding: 15px;
            box-shadow: var(--card-shadow);
            display: none;
            width: 200px;
            text-align: center;
        }

        .qr-popover img {
            width: 150px;
            height: 150px;
            margin-bottom: 8px;
        }

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

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

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: var(--secondary);
        }

        .footer-col p, .footer-col li {
            font-size: 0.95rem;
            color: #ccc;
            margin-bottom: 12px;
        }

        .footer-col a {
            color: var(--tertiary);
            text-decoration: none;
        }

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

        .footer-bottom {
            border-top: 1px solid #333;
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

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

        .friend-links a {
            color: #aaa;
            text-decoration: none;
            font-size: 0.9rem;
        }

        .friend-links a:hover {
            color: var(--secondary);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                margin-top: 20px;
            }
            .grid-3, .cases-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--white);
                border-bottom: var(--border-width) solid var(--dark);
                flex-direction: column;
                padding: 20px;
                gap: 10px;
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .grid-3, .grid-2, .cases-grid, .footer-grid {
                grid-template-columns: 1fr;
            }
            section {
                padding: 50px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }