/* CSS Reset & Variables */
        :root {
            --primary: #6366f1; /* 电光紫 */
            --secondary: #ec4899; /* 魅惑粉 */
            --accent: #f97316; /* 活力橙 */
            --cyan: #06b6d4; /* 科技蓝 */
            --dark: #0f172a; /* 极客灰 */
            --light: #f8fafc; /* 干净底 */
            --border-width: 2.5px;
            --shadow-offset: 4px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        /* Neo-Brutalism UI Base Elements */
        .btn-neo {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.75rem;
            font-weight: 700;
            text-decoration: none;
            color: var(--dark);
            border: var(--border-width) solid var(--dark);
            background-color: #ffffff;
            border-radius: 8px;
            box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--dark);
            transition: all 0.2s cubic-bezier(0.165, 0.84, 0.44, 1);
            cursor: pointer;
        }

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

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

        .btn-primary {
            background-color: var(--accent);
            color: #ffffff;
            border-color: var(--dark);
        }

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

        .card-neo {
            background-color: #ffffff;
            border: var(--border-width) solid var(--dark);
            border-radius: 12px;
            box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--dark);
            padding: 2rem;
            transition: all 0.3s ease;
        }

        .card-neo:hover {
            transform: translateY(-4px);
            box-shadow: 6px 6px 0px var(--dark);
        }

        .badge-neo {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            font-size: 0.85rem;
            font-weight: 800;
            text-transform: uppercase;
            border: 2px solid var(--dark);
            border-radius: 9999px;
            background-color: var(--secondary);
            color: #ffffff;
            margin-bottom: 0.75rem;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
            width: 100%;
        }

        section {
            padding: 5rem 0;
            border-bottom: var(--border-width) solid var(--dark);
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 900;
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
            display: inline-block;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 8px;
            background-color: var(--primary);
            z-index: -1;
            transform: rotate(-1.5deg);
        }

        /* Header Navigation */
        header {
            position: sticky;
            top: 0;
            background-color: #ffffff;
            border-bottom: var(--border-width) solid var(--dark);
            z-index: 1000;
            padding: 1rem 0;
        }

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

        .brand {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .brand img {
            height: 45px;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
            align-items: center;
        }

        nav a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 700;
            font-size: 0.95rem;
            transition: color 0.2s;
        }

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

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            border: 2px solid var(--dark);
            padding: 5px;
            border-radius: 4px;
            cursor: pointer;
            background: none;
        }

        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            display: block;
        }

        /* Hero Section (No Images Allowed) */
        .hero {
            background: linear-gradient(135deg, #fef9c3 0%, #e0f2fe 100%);
            text-align: center;
            padding: 7rem 0;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 10%;
            left: 5%;
            width: 50px;
            height: 50px;
            border: 3px solid var(--primary);
            transform: rotate(45deg);
            border-radius: 8px;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: 15%;
            right: 8%;
            width: 70px;
            height: 70px;
            background-color: var(--secondary);
            opacity: 0.3;
            border-radius: 50%;
        }

        .hero h1 {
            font-size: 3rem;
            font-weight: 900;
            line-height: 1.2;
            color: var(--dark);
            margin-bottom: 1.5rem;
        }

        .hero p {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 2.5rem auto;
            color: #475569;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }

        /* Grid Frameworks */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2rem;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.5rem;
        }

        /* Data Indicators & Features */
        .indicator-value {
            font-size: 3rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 0.5rem;
        }

        .feature-icon {
            font-size: 2rem;
            margin-bottom: 1rem;
            display: inline-block;
            padding: 0.5rem;
            background-color: #f1f5f9;
            border: 2px solid var(--dark);
            border-radius: 8px;
        }

        /* Models Marquee */
        .marquee-section {
            background-color: var(--dark);
            color: #ffffff;
            padding: 1.5rem 0;
            overflow: hidden;
            white-space: nowrap;
            border-bottom: var(--border-width) solid var(--dark);
        }

        .marquee-track {
            display: inline-block;
            animation: marquee 30s linear infinite;
        }

        .marquee-track span {
            font-weight: 800;
            font-size: 1.2rem;
            margin-right: 3rem;
            color: var(--cyan);
        }

        @keyframes marquee {
            0% { transform: translate3d(0, 0, 0); }
            100% { transform: translate3d(-50%, 0, 0); }
        }

        /* Image Display Box */
        .showcase-img-container {
            border: var(--border-width) solid var(--dark);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--dark);
            margin-top: 1.5rem;
            height: 250px;
        }

        .showcase-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Table & Evaluation Styles */
        .table-responsive {
            overflow-x: auto;
            border: var(--border-width) solid var(--dark);
            border-radius: 12px;
            box-shadow: var(--shadow-offset) var(--shadow-offset) 0px var(--dark);
            background-color: #ffffff;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 600px;
        }

        th, td {
            padding: 1rem 1.5rem;
            border-bottom: 2px solid var(--dark);
        }

        th {
            background-color: var(--cyan);
            color: var(--dark);
            font-weight: 800;
        }

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

        .score-badge {
            background-color: var(--accent);
            color: white;
            font-weight: 900;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            border: 2px solid var(--dark);
            display: inline-block;
        }

        /* Diagnostic Flow & Terminology Tabs */
        .tab-buttons {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }

        .tab-btn {
            background: #ffffff;
            border: 2px solid var(--dark);
            padding: 0.5rem 1rem;
            font-weight: bold;
            cursor: pointer;
            border-radius: 6px;
        }

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

        .tab-content {
            display: none;
            padding: 1.5rem;
            background: white;
            border: 2px solid var(--dark);
            border-radius: 8px;
        }

        .tab-content.active {
            display: block;
        }

        /* FAQ Accordion */
        .faq-item {
            border: 2px solid var(--dark);
            border-radius: 8px;
            margin-bottom: 1rem;
            background-color: #ffffff;
            overflow: hidden;
        }

        .faq-question {
            padding: 1rem 1.5rem;
            font-weight: 800;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #f8fafc;
        }

        .faq-answer {
            padding: 0 1.5rem;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.2s ease-out, padding 0.2s ease-out;
            border-top: 0px solid var(--dark);
        }

        .faq-item.open .faq-answer {
            padding: 1rem 1.5rem;
            max-height: 500px;
            border-top: 2px solid var(--dark);
        }

        /* Contact & Form */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }

        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 1.25rem;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

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

        .form-group input, .form-group select, .form-group textarea {
            padding: 0.75rem;
            border: 2px solid var(--dark);
            border-radius: 6px;
            font-family: inherit;
            outline: none;
        }

        .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
        }

        /* QR Codes & Cards */
        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .qr-card {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            background: #ffffff;
            border: 2px solid var(--dark);
            padding: 1rem;
            border-radius: 8px;
        }

        .qr-card img {
            width: 100px;
            height: 100px;
            border: 1px solid #ccc;
        }

        /* Articles & Footer Links */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }

        .article-card {
            background-color: white;
            border: 2px solid var(--dark);
            border-radius: 8px;
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .article-card h3 {
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }

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

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            padding: 1.5rem 0;
            border-top: 2px solid var(--dark);
            border-bottom: 2px solid var(--dark);
            margin: 2rem 0;
        }

        .footer-links a {
            color: var(--dark);
            text-decoration: none;
            font-weight: bold;
            font-size: 0.9rem;
        }

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

        footer {
            background-color: #ffffff;
            border-top: var(--border-width) solid var(--dark);
            padding: 3rem 0;
            font-size: 0.95rem;
        }

        /* Float Widget */
        .float-widget {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            z-index: 1000;
        }

        .float-btn {
            background-color: var(--accent);
            border: 2px solid var(--dark);
            color: var(--dark);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            cursor: pointer;
            box-shadow: 2px 2px 0px var(--dark);
            position: relative;
        }

        .float-btn:hover {
            transform: translate(-2px, -2px);
            box-shadow: 4px 4px 0px var(--dark);
        }

        .qr-popover {
            display: none;
            position: absolute;
            bottom: 60px;
            right: 0;
            background: white;
            border: 2px solid var(--dark);
            padding: 1rem;
            border-radius: 8px;
            box-shadow: 4px 4px 0px var(--dark);
            width: 200px;
            text-align: center;
        }

        .qr-popover img {
            width: 100%;
            height: auto;
        }

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

        /* Mobile Responsive */
        @media (max-width: 968px) {
            .hamburger {
                display: flex;
            }

            nav {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: #ffffff;
                border-bottom: var(--border-width) solid var(--dark);
                padding: 1.5rem;
                box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            }

            nav.show {
                display: block;
            }

            nav ul {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }

            .contact-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }