:root {
            --primary: #7c3aed;
            --primary-light: #a78bfa;
            --primary-dark: #5b21b6;
            --secondary: #db2777;
            --accent: #06b6d4;
            --text-dark: #1e1b4b;
            --text-muted: #4b5563;
            --bg-light: #faf5ff;
            --bg-white: #ffffff;
            --bg-card: #f8fafc;
            --border-color: #e2e8f0;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

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

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

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

        /* Header & Nav */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(124, 58, 237, 0.08);
            z-index: 1000;
            border-bottom: 1px solid rgba(124, 58, 237, 0.1);
        }

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

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

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

        .brand-name {
            font-size: 1.25rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-menu {
            display: flex;
            gap: 20px;
            list-style: none;
            align-items: center;
        }

        .nav-item a {
            font-weight: 500;
            color: var(--text-muted);
            font-size: 0.95rem;
            padding: 5px 10px;
            border-radius: 6px;
        }

        .nav-item a:hover, .nav-item.active a {
            color: var(--primary);
            background-color: rgba(124, 58, 237, 0.05);
        }

        .nav-btn {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff !important;
            padding: 8px 18px !important;
            border-radius: 20px;
            font-weight: bold;
            box-shadow: 0 4px 10px rgba(124, 58, 237, 0.2);
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(124, 58, 237, 0.3);
        }

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

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

        /* Hero Section (No Images Allowed) */
        .hero-section {
            padding: 160px 0 100px;
            background: radial-gradient(circle at 80% 20%, rgba(219, 39, 119, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 20% 80%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
                        var(--bg-white);
            text-align: center;
            border-bottom: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(ellipse at center, rgba(167, 139, 250, 0.03) 0%, transparent 70%);
            animation: rotateBg 40s linear infinite;
            z-index: 1;
            pointer-events: none;
        }

        @keyframes rotateBg {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 850px;
            margin: 0 auto;
        }

        .badge-premium {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(124, 58, 237, 0.08);
            border: 1px solid rgba(124, 58, 237, 0.2);
            color: var(--primary);
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 25px;
            letter-spacing: 1px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        h1.hero-title {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-dark);
            margin-bottom: 20px;
        }

        h1.hero-title span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 35px;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 45px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 28px;
            font-size: 1rem;
            font-weight: 700;
            border-radius: 30px;
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            box-shadow: 0 10px 20px rgba(124, 58, 237, 0.25);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 25px rgba(124, 58, 237, 0.35);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-outline:hover {
            background: rgba(124, 58, 237, 0.05);
            transform: translateY(-3px);
        }

        /* Section Global Settings */
        section {
            padding: 90px 0;
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }

        .section-light {
            background-color: var(--bg-white);
        }

        .section-gray {
            background-color: var(--bg-light);
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-tag {
            color: var(--secondary);
            font-weight: 700;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 10px;
            display: block;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-dark);
        }

        .section-desc {
            color: var(--text-muted);
            max-width: 600px;
            margin: 15px auto 0;
            font-size: 1.05rem;
        }

        /* Data indicators card */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .data-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 25px 20px;
            border-radius: 12px;
            text-align: center;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
            transition: var(--transition);
        }

        .data-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary-light);
            box-shadow: 0 10px 20px rgba(124, 58, 237, 0.06);
        }

        .data-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .data-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 600;
        }

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

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

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

        /* Services & Production Cards */
        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(to bottom, var(--primary), var(--secondary));
            opacity: 0;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 30px rgba(124, 58, 237, 0.1);
            border-color: rgba(124, 58, 237, 0.2);
        }

        .service-card:hover::before {
            opacity: 1;
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background: rgba(124, 58, 237, 0.08);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-title {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-dark);
        }

        .service-desc {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 15px;
        }

        .service-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .tag-pill {
            background-color: var(--bg-light);
            color: var(--primary-dark);
            font-size: 0.75rem;
            padding: 3px 8px;
            border-radius: 4px;
            font-weight: 600;
        }

        /* Supported Models Marquee */
        .model-list-wrapper {
            margin-top: 30px;
            overflow: hidden;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 20px 0;
            border-radius: 12px;
        }

        .model-track {
            display: flex;
            gap: 30px;
            animation: scrollMarquee 25s linear infinite;
            width: max-content;
        }

        .model-item {
            font-weight: bold;
            color: var(--text-muted);
            font-size: 1rem;
            padding: 8px 16px;
            background: var(--bg-light);
            border-radius: 8px;
            border: 1px solid rgba(124, 58, 237, 0.05);
            white-space: nowrap;
        }

        @keyframes scrollMarquee {
            0% { transform: translateX(0); }
            100% { transform: translateX(-50%); }
        }

        /* Timeline / Workflow */
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 40px auto 0;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 31px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--border-color);
        }

        .timeline-item {
            position: relative;
            padding-left: 70px;
            margin-bottom: 40px;
        }

        .timeline-item:last-child {
            margin-bottom: 0;
        }

        .timeline-badge {
            position: absolute;
            left: 16px;
            top: 0;
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 0.9rem;
            z-index: 2;
        }

        .timeline-content {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 20px 25px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.01);
        }

        .timeline-title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        /* Table Design for Comparison & Token比价 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            margin-top: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 10px rgba(0,0,0,0.01);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            background: var(--bg-white);
            font-size: 0.95rem;
        }

        th, td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        th {
            background-color: var(--bg-light);
            color: var(--text-dark);
            font-weight: 700;
        }

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

        .highlight-row {
            background-color: rgba(124, 58, 237, 0.03);
        }

        .rating-stars {
            color: #f59e0b;
            font-size: 1.1rem;
        }

        .score-badge {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            padding: 4px 10px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.85rem;
            display: inline-block;
        }

        /* Cases Center */
        .case-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            overflow: hidden;
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.05);
        }

        .case-img-container {
            width: 100%;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #e2e8f0;
        }

        .case-img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .case-card:hover .case-img-container img {
            transform: scale(1.05);
        }

        .case-body {
            padding: 24px;
        }

        .case-category {
            color: var(--secondary);
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 8px;
            display: block;
        }

        .case-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .case-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 15px;
        }

        /* Form Design */
        .form-wrapper {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(124, 58, 237, 0.05);
            max-width: 700px;
            margin: 0 auto;
        }

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

        .form-label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .form-input, .form-select, .form-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.95rem;
            background-color: var(--bg-light);
            color: var(--text-dark);
            transition: var(--transition);
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
            background-color: var(--bg-white);
            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
        }

        .form-textarea {
            resize: vertical;
            min-height: 120px;
        }

        /* FAQ Accordion */
        .faq-accordion {
            max-width: 850px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: 700;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: var(--transition);
        }

        .faq-question:hover {
            background-color: rgba(124, 58, 237, 0.02);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            border-top: 0px solid var(--border-color);
        }

        .faq-item.active {
            border-color: var(--primary-light);
        }

        .faq-item.active .faq-answer {
            max-height: 500px;
            padding-bottom: 18px;
            border-top-width: 1px;
        }

        .faq-icon::after {
            content: '+';
            font-size: 1.4rem;
            color: var(--primary);
            font-weight: normal;
        }

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

        /* Testimonials / Reviews */
        .testimonial-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.01);
            position: relative;
        }

        .testimonial-text {
            color: var(--text-muted);
            font-style: italic;
            font-size: 0.95rem;
            margin-bottom: 20px;
            line-height: 1.7;
        }

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

        .user-avatar {
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--primary-light), var(--secondary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: bold;
        }

        .user-info h4 {
            font-size: 0.95rem;
            color: var(--text-dark);
            margin-bottom: 2px;
        }

        .user-info span {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Tech Training & Glossary */
        .badge-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 15px;
        }

        .badge-item {
            background-color: rgba(124, 58, 237, 0.08);
            color: var(--primary-dark);
            border: 1px solid rgba(124, 58, 237, 0.15);
            padding: 8px 16px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .glossary-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .glossary-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 10px;
        }

        .glossary-term {
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }

        /* Troubleshooting Selector */
        .diagnostic-box {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            max-width: 800px;
            margin: 0 auto;
        }

        .diagnostic-step {
            margin-bottom: 20px;
        }

        .diagnostic-step:last-child {
            margin-bottom: 0;
        }

        /* Knowledge Base Articles */
        .article-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .article-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            transition: var(--transition);
        }

        .article-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary-light);
        }

        .article-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            display: block;
        }

        .article-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .article-link {
            font-size: 0.9rem;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        /* Contact & Agent Section */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 50px;
        }

        .contact-info-panel {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 20px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-details {
            margin-bottom: 30px;
        }

        .contact-item {
            margin-bottom: 20px;
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }

        .contact-icon {
            color: var(--primary);
            font-size: 1.2rem;
            margin-top: 3px;
        }

        .contact-text h4 {
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 4px;
        }

        .contact-text p, .contact-text a {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        .qrcode-container {
            display: flex;
            gap: 20px;
            align-items: center;
            border-top: 1px solid var(--border-color);
            padding-top: 25px;
        }

        .qrcode-box {
            width: 110px;
            height: 110px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 5px;
            background: var(--bg-white);
        }

        .qrcode-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .qrcode-desc {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .qrcode-desc strong {
            display: block;
            color: var(--text-dark);
            margin-bottom: 5px;
        }

        /* Float Customer Service */
        .float-cs {
            position: fixed;
            right: 25px;
            bottom: 25px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--bg-white);
            box-shadow: 0 4px 15px rgba(124, 58, 237, 0.15);
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            color: var(--primary);
            position: relative;
        }

        .float-btn:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }

        .float-btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            border: none;
        }

        .float-btn-primary:hover {
            box-shadow: 0 6px 20px rgba(124, 58, 237, 0.3);
        }

        .float-panel {
            position: absolute;
            right: 60px;
            bottom: 0;
            width: 250px;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            padding: 20px;
            display: none;
            flex-direction: column;
            align-items: center;
            text-align: center;
            opacity: 0;
            transform: translateY(10px);
            transition: var(--transition);
        }

        .float-panel.show {
            display: flex;
            opacity: 1;
            transform: translateY(0);
        }

        .float-panel img {
            width: 150px;
            height: 150px;
            margin-bottom: 10px;
        }

        /* Footer */
        footer {
            background-color: var(--text-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 70px 0 30px;
            font-size: 0.9rem;
            border-top: 3px solid var(--secondary);
        }

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

        .footer-logo-desc {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .footer-logo-desc .brand-name {
            font-size: 1.5rem;
        }

        .footer-links-col h4, .footer-friendships h4 {
            color: #fff;
            margin-bottom: 20px;
            font-weight: 700;
            font-size: 1.05rem;
        }

        .footer-links-list {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
        }

        .footer-links-list a {
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }

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

        .footer-friendships {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-friendships a {
            color: rgba(255, 255, 255, 0.55);
            margin-right: 15px;
            display: inline-block;
            transition: var(--transition);
        }

        .footer-friendships a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.5);
            margin-left: 20px;
        }

        .footer-bottom-links a:hover {
            color: #fff;
        }

        /* Animations */
        .fade-in-section {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

        .fade-in-section.is-visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .contact-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            h1.hero-title {
                font-size: 2.2rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .grid-2 {
                grid-template-columns: 1fr;
                gap: 25px;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--bg-white);
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .glossary-grid {
                grid-template-columns: 1fr;
            }
            .article-list {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .grid-3, .grid-4, .data-grid {
                grid-template-columns: 1fr;
            }
            h1.hero-title {
                font-size: 1.8rem;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-buttons .btn {
                width: 100%;
            }
            .form-wrapper {
                padding: 20px;
            }
        }