/* CSS Reset & Variables (暗夜赛博高饱和粉紫风) */
        :root {
            --bg-dark: #0a0616;
            --bg-card: rgba(22, 14, 45, 0.7);
            --bg-nav: rgba(10, 6, 22, 0.95);
            --primary: #ff007f; /* 高饱和粉 */
            --secondary: #8a2be2; /* 高饱和紫 */
            --cyan: #00f0ff; /* 霓虹青 */
            --text-light: #ffffff;
            --text-gray: #a59cb5;
            --border-color: rgba(255, 0, 127, 0.2);
            --border-hover: rgba(0, 240, 255, 0.5);
            --transition: all 0.3s ease;
        }

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

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

        body {
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 10% 20%, rgba(138, 43, 226, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, rgba(255, 0, 127, 0.15) 0%, transparent 40%);
            background-attachment: fixed;
        }

        /* Layout Container */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Typography */
        h1, h2, h3, h4 {
            font-weight: 700;
            letter-spacing: 1px;
        }

        h2 {
            font-size: 2.2rem;
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
            background: linear-gradient(45deg, var(--primary), var(--cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-transform: uppercase;
        }

        h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--cyan));
            margin: 10px auto 0;
            border-radius: 2px;
        }

        p {
            line-height: 1.6;
            color: var(--text-gray);
        }

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

        /* Header & Navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: var(--bg-nav);
            border-bottom: 1px solid var(--border-color);
            backdrop-filter: blur(10px);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

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

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

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

        .nav-links {
            display: flex;
            gap: 20px;
            list-style: none;
        }

        .nav-links a {
            font-size: 0.95rem;
            color: var(--text-gray);
        }

        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
            text-shadow: 0 0 10px var(--primary);
        }

        .nav-btn {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: 600;
            box-shadow: 0 0 15px rgba(255, 0, 127, 0.4);
        }

        .nav-btn:hover {
            box-shadow: 0 0 25px rgba(255, 0, 127, 0.7);
            transform: translateY(-2px);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: none;
            border: none;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--text-light);
            transition: var(--transition);
        }

        /* Hero Section (No Image Allowed) */
        .hero {
            padding: 160px 0 100px;
            text-align: center;
            position: relative;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(255, 0, 127, 0.1);
            border: 1px solid var(--primary);
            border-radius: 30px;
            font-size: 0.85rem;
            color: var(--primary);
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 2px;
            box-shadow: 0 0 15px rgba(255, 0, 127, 0.2);
        }

        .hero h1 {
            font-size: 3rem;
            line-height: 1.2;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #fff 30%, var(--primary) 70%, var(--cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            max-width: 800px;
            margin: 0 auto 40px;
            font-size: 1.2rem;
            color: var(--text-gray);
        }

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

        .btn {
            display: inline-block;
            padding: 12px 32px;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            box-shadow: 0 0 20px rgba(255, 0, 127, 0.5);
        }

        .btn-primary:hover {
            box-shadow: 0 0 30px rgba(255, 0, 127, 0.8);
            transform: translateY(-3px);
        }

        .btn-secondary {
            background: transparent;
            border: 2px solid var(--cyan);
            color: var(--cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }

        .btn-secondary:hover {
            background: var(--cyan);
            color: #000;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
            transform: translateY(-3px);
        }

        /* Section Settings */
        section {
            padding: 80px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        /* Stats Grid */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: -30px;
            margin-bottom: 50px;
        }

        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 30px 20px;
            border-radius: 15px;
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 240, 255, 0.15);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--cyan);
            margin-bottom: 10px;
            text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
        }

        .stat-label {
            color: var(--text-gray);
            font-size: 0.9rem;
        }

        /* About Section & Platform Info */
        .about-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-content h3 {
            font-size: 1.8rem;
            color: var(--cyan);
            margin-bottom: 20px;
        }

        .about-content p {
            margin-bottom: 15px;
            font-size: 1.05rem;
        }

        .feature-bullets {
            list-style: none;
            margin-top: 25px;
        }

        .feature-bullets li {
            position: relative;
            padding-left: 25px;
            margin-bottom: 12px;
            color: var(--text-light);
        }

        .feature-bullets li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
        }

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

        .cyber-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 30px;
            border-radius: 15px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .cyber-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(138, 43, 226, 0.25);
        }

        .cyber-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }

        .card-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            display: inline-block;
        }

        .cyber-card h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--text-light);
        }

        .cyber-card p {
            font-size: 0.95rem;
        }

        /* Model tags cloud */
        .tags-container {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .model-tag {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 0.75rem;
            color: var(--text-gray);
            transition: var(--transition);
        }

        .model-tag:hover {
            background: rgba(0, 240, 255, 0.1);
            border-color: var(--cyan);
            color: var(--cyan);
        }

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

        .timeline::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 2px;
            background: var(--border-color);
            transform: translateX(-50%);
        }

        .timeline-item {
            margin-bottom: 50px;
            position: relative;
            width: 50%;
            padding: 0 40px;
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--primary);
            border: 4px solid var(--bg-dark);
            top: 5px;
            right: -8px;
            z-index: 1;
            box-shadow: 0 0 10px var(--primary);
        }

        .timeline-item.left {
            left: 0;
            text-align: right;
        }

        .timeline-item.right {
            left: 50%;
        }

        .timeline-item.right::after {
            left: -8px;
        }

        .timeline-content {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 12px;
        }

        .timeline-step {
            display: inline-block;
            font-size: 0.8rem;
            color: var(--cyan);
            font-weight: 700;
            margin-bottom: 5px;
        }

        .timeline-content h3 {
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

        /* Table Style (Scrollable) */
        .table-wrapper {
            width: 100%;
            overflow-x: auto;
            margin: 30px 0;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

        th, td {
            padding: 16px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        th {
            background-color: rgba(22, 14, 45, 0.9);
            color: var(--cyan);
            font-weight: 600;
        }

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

        tr:hover td {
            background-color: rgba(255, 0, 127, 0.05);
        }

        .rating-badge {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            color: #ffd700;
            font-weight: bold;
        }

        /* Image Display Section */
        .image-gallery {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 30px;
        }

        .image-box {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .image-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: var(--transition);
        }

        .image-box:hover img {
            transform: scale(1.05);
        }

        .image-label {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0,0,0,0.8));
            padding: 20px;
            color: #fff;
        }

        .horizontal-images {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        .banner-group {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 30px;
        }

        .banner-group img {
            border-radius: 8px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .banner-group img:hover {
            border-color: var(--cyan);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
        }

        /* Testimonials Section */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .testimonial-text {
            font-style: italic;
            margin-bottom: 20px;
            color: var(--text-gray);
            font-size: 0.95rem;
        }

        .testimonial-user {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .user-avatar {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: #fff;
        }

        .user-meta h4 {
            font-size: 1rem;
            color: var(--text-light);
        }

        .user-meta span {
            font-size: 0.8rem;
            color: var(--cyan);
        }

        /* FAQ Section (Accordion) */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: var(--transition);
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            padding: 0 20px;
            color: var(--text-gray);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .faq-item.active .faq-answer {
            max-height: 1000px;
            padding: 0 20px 20px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .faq-icon::after {
            content: '+';
            font-size: 1.2rem;
            font-weight: bold;
        }

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

        /* Form Section */
        .contact-layout {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
        }

        .form-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 15px;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

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

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

        .form-group label {
            font-size: 0.9rem;
            color: var(--text-gray);
        }

        .form-group input, .form-group select, .form-group textarea {
            background: rgba(10, 6, 22, 0.8);
            border: 1px solid var(--border-color);
            padding: 12px;
            border-radius: 6px;
            color: #fff;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }

        .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
            border-color: var(--cyan);
            box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
        }

        .contact-info-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 15px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .info-item {
            margin-bottom: 25px;
        }

        .info-item h4 {
            color: var(--cyan);
            margin-bottom: 5px;
        }

        .info-item p {
            color: var(--text-light);
        }

        .qr-code-box {
            margin-top: 20px;
            text-align: center;
            padding: 20px;
            background: rgba(255, 255, 255, 0.02);
            border: 1px dashed var(--border-color);
            border-radius: 10px;
        }

        .qr-code-box img {
            max-width: 150px;
            height: auto;
            border-radius: 8px;
            margin-top: 10px;
        }

        /* Footer & Links */
        footer {
            background: #05030b;
            padding: 60px 0 30px;
            border-top: 1px solid var(--border-color);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 50px;
            margin-bottom: 40px;
        }

        .footer-about h3 {
            color: var(--cyan);
            margin-bottom: 15px;
        }

        .footer-links h4, .footer-articles h4 {
            color: var(--primary);
            margin-bottom: 15px;
            font-size: 1.1rem;
        }

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

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

        .footer-links a {
            color: var(--text-gray);
        }

        .footer-links a:hover {
            color: var(--cyan);
            padding-left: 5px;
        }

        .article-list {
            list-style: none;
        }

        .article-list li {
            margin-bottom: 10px;
            font-size: 0.9rem;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .article-list a {
            color: var(--text-gray);
        }

        .article-list a:hover {
            color: var(--primary);
        }

        .friend-links {
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            margin-bottom: 30px;
        }

        .friend-links h5 {
            color: var(--text-gray);
            margin-bottom: 10px;
        }

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

        .friend-links-list a {
            color: var(--text-gray);
            font-size: 0.85rem;
        }

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

        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.85rem;
            color: var(--text-gray);
        }

        /* Float Sidebar Widget */
        .float-widget {
            position: fixed;
            right: 20px;
            bottom: 100px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .widget-item {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            position: relative;
            transition: var(--transition);
        }

        .widget-item:hover {
            transform: scale(1.1);
        }

        .widget-popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: 8px;
            display: none;
            width: 180px;
            text-align: center;
            box-shadow: 0 5px 25px rgba(0,0,0,0.5);
        }

        .widget-item:hover .widget-popover {
            display: block;
        }

        .widget-popover img {
            width: 100%;
            height: auto;
            border-radius: 4px;
        }

        .back-to-top {
            background: #111;
            border: 1px solid var(--border-color);
            color: #fff;
            display: none;
        }

        .back-to-top:hover {
            background: var(--cyan);
            color: #000;
        }

        /* Terminology Cards */
        .term-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 30px;
        }

        .term-card {
            background: rgba(255,255,255,0.02);
            border: 1px solid rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: 8px;
            transition: var(--transition);
        }

        .term-card:hover {
            border-color: var(--primary);
            background: rgba(255, 0, 127, 0.05);
        }

        .term-card h4 {
            color: var(--cyan);
            margin-bottom: 10px;
        }

        /* Responsive Styles */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-layout, .contact-layout {
                grid-template-columns: 1fr;
            }
            .testimonials-grid, .term-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }
            .nav-links {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background: var(--bg-nav);
                flex-direction: column;
                align-items: center;
                padding: 40px 0;
                transition: var(--transition);
            }
            .nav-links.active {
                left: 0;
            }
            .timeline::before {
                left: 20px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 50px;
                padding-right: 0;
            }
            .timeline-item.left {
                text-align: left;
            }
            .timeline-item.right {
                left: 0;
            }
            .timeline-item::after {
                left: 12px !important;
            }
            .testimonials-grid, .term-grid, .footer-grid {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .image-gallery {
                grid-template-columns: 1fr;
            }
            .banner-group {
                grid-template-columns: 1fr;
            }
        }