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

        :root {
            --bg-dark: #0a0a0a;
            --bg-card: #151515;
            --bg-hover: #1f1f1f;
            --text-primary: #ffffff;
            --text-secondary: #a0a0a0;
            --accent: #00d4ff;
            --accent-dim: #0095b3;
            --border: #2a2a2a;
            --success: #00ff88;
            --warning: #ffaa00;
        }

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

        /* Navigation */
        nav {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 20px 0;
            background: rgba(10, 10, 10, 0.95);
            backdrop-filter: blur(20px);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* Documents Section */
        .documents-section {
            padding: 120px 40px 80px;
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-title {
            text-align: center;
            font-size: 48px;
            font-weight: 900;
            margin-bottom: 20px;
            letter-spacing: -2px;
        }

        .section-subtitle {
            text-align: center;
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 60px;
            line-height: 1.6;
        }

        /* Documents Grid */
        .documents-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .document-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            padding: 20px;
            border-radius: 16px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            cursor: pointer;
            height: 320px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .document-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--accent-dim));
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

        .document-card:hover {
            transform: translateY(-8px);
            border-color: var(--accent);
            box-shadow: 0 15px 40px rgba(0, 212, 255, 0.2);
        }

        .document-card:hover::before {
            transform: scaleX(1);
        }

        .document-icon {
            width: 100px;
            height: 150px;
            margin-bottom: 20px;
        }

        .document-icon img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }

        .document-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .document-description {
            color: var(--text-secondary);
            margin-bottom: 20px;
            line-height: 1.6;
            flex-grow: 1;
        }

        .document-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 15px;
        }

        .document-type {
            background: var(--bg-hover);
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 12px;
            text-transform: uppercase;
        }

        .document-btn {
            width: 100%;
            padding: 12px 20px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dim));
            color: var(--bg-dark);
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 14px;
        }

        .document-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
        }

        /* PDF Reader Modal */
        .pdf-reader-modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.95);
            z-index: 10000;
            display: none;
            flex-direction: column;
        }

        .pdf-reader-modal.active {
            display: flex;
        }

        .pdf-header {
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
            padding: 20px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-shrink: 0;
        }

        .pdf-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .pdf-controls {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .pdf-controls button {
            background: var(--bg-hover);
            border: 1px solid var(--border);
            color: var(--text-primary);
            padding: 8px 16px;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 14px;
        }

        .pdf-controls button:hover:not(:disabled) {
            background: var(--accent);
            color: var(--bg-dark);
            border-color: var(--accent);
        }

        .pdf-controls button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }

        .page-info {
            color: var(--text-secondary);
            font-size: 14px;
            margin: 0 10px;
        }

        .zoom-controls {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .close-btn {
            background: var(--bg-hover);
            border: 1px solid var(--border);
            color: var(--text-primary);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            transition: all 0.3s ease;
        }

        .close-btn:hover {
            background: #ff4444;
            border-color: #ff4444;
        }

        .pdf-content {
            flex: 1;
            overflow: auto;
            padding: 20px;
            display: flex;
            justify-content: center;
            align-items: flex-start;
            background: #2a2a2a;
        }

        .pdf-viewer, .image-viewer {
            background: white;
            border-radius: 8px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
            max-width: 100%;
            max-height: 100%;
        }

        .pdf-canvas {
            display: block;
            border-radius: 8px;
        }

        .image-viewer {
            border-radius: 8px;
            transition: transform 0.3s ease;
        }

        .loading-spinner {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 200px;
            color: var(--text-secondary);
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 3px solid var(--border);
            border-top: 3px solid var(--accent);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-bottom: 20px;
        }

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

        .error-message {
            background: #ff4444;
            color: white;
            padding: 20px;
            border-radius: 8px;
            text-align: center;
            margin: 20px;
        }

        /* Notification */
        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            background: var(--accent);
            color: var(--bg-dark);
            padding: 15px 25px;
            border-radius: 8px;
            font-weight: 600;
            z-index: 10001;
            transform: translateX(400px);
            transition: transform 0.3s ease;
        }

        .notification.show {
            transform: translateX(0);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .documents-section {
                padding: 100px 20px 60px;
            }

            .section-title {
                font-size: 36px;
            }

            .documents-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .pdf-header {
                padding: 15px 20px;
                flex-direction: column;
                gap: 15px;
            }

            .pdf-title {
                font-size: 18px;
            }

            .pdf-controls {
                gap: 10px;
                flex-wrap: wrap;
            }

            .pdf-controls button {
                padding: 6px 12px;
                font-size: 12px;
            }
        }

        /* Footer */
        footer {
            padding: 60px 40px;
            background: var(--bg-card);
            border-top: 1px solid var(--border);
            text-align: center;
            margin-top: 80px;
        }

        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-bottom: 32px;
            list-style: none;
        }

        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

        .copyright {
            color: var(--text-secondary);
            font-size: 14px;
        }