:root {
            /* Header colors */
            --pdf-header-primary: #6c63ff;
            --pdf-header-primary-dark: #4d44db;
            --pdf-header-secondary: #ff6584;
            --pdf-header-accent: #39e1e3;
            --pdf-header-dark: #2a2a72;
            --pdf-header-light: #f8f9fa;
            --pdf-header-text: #333;
            --pdf-header-text-light: #777;
            --pdf-header-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            --pdf-header-transition: all 0.3s ease;
            --pdf-header-height: 60px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Poppins', sans-serif;
            line-height: 1.6;
            color: var(--dark);
            min-height: 100vh;
            overflow-x: hidden;
            padding-top: var(--pdf-header-height);
        }
        
        /* Scroll Progress Indicator */
        .pdf-scroll-progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 4px;
            background: linear-gradient(to right, var(--pdf-header-accent), var(--pdf-header-primary));
            width: 0%;
            z-index: 1001;
            transition: width 0.1s ease;
        }
        
        /* Header Styles */
        .pdf-header {
            background: linear-gradient(135deg, var(--pdf-header-dark), var(--pdf-header-primary-dark));
            color: white;
            padding: 0;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            box-shadow: var(--pdf-header-shadow);
            height: var(--pdf-header-height);
            transition: var(--pdf-header-transition);
        }
        
        .pdf-container {
            width: 95%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        .pdf-header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: var(--pdf-header-height);
            position: relative;
        }
        
        .pdf-logo {
            display: flex;
            align-items: center;
            text-decoration: none;
            transition: var(--pdf-header-transition);
        }
        
        .pdf-logo:hover {
            transform: scale(1.03);
        }
        
        .pdf-logo-icon {
            font-size: 1.8rem;
            margin-right: 0.5rem;
            color: var(--pdf-header-accent);
            transition: var(--pdf-header-transition);
        }
        
        .pdf-logo-text {
            font-family: 'Montserrat', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(to right, white, var(--pdf-header-accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            transition: var(--pdf-header-transition);
        }
        
        /* Navigation */
        .pdf-nav {
            display: flex;
            align-items: center;
        }
        
        .pdf-nav-links {
            display: flex;
            list-style: none;
            transition: var(--pdf-header-transition);
        }
        
        .pdf-nav-links li {
            margin-left: 1.5rem;
            position: relative;
        }
        
        .pdf-nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            display: flex;
            align-items: center;
            transition: var(--pdf-header-transition);
            padding: 0.5rem 0;
            font-size: 0.95rem;
            white-space: nowrap;
        }
        
        .pdf-nav-links a i {
            margin-right: 0.5rem;
            font-size: 1.1rem;
            transition: var(--pdf-header-transition);
        }
        
        .pdf-nav-links a:hover {
            color: var(--pdf-header-accent);
            transform: translateY(-2px);
        }
        
        .pdf-nav-links a:hover i {
            transform: scale(1.1);
        }
        
        .pdf-nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--pdf-header-accent);
            transition: var(--pdf-header-transition);
        }
        
        .pdf-nav-links a:hover::after {
            width: 100%;
        }
        
        .pdf-nav-links .pdf-active {
            color: var(--pdf-header-accent);
            font-weight: 600;
        }
        
        .pdf-nav-links .pdf-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--pdf-header-accent);
            border-radius: 3px;
        }
        
        /* Search Box */
        .pdf-header-search {
            margin-left: 1.5rem;
            position: relative;
            width: 250px;
            transition: var(--pdf-header-transition);
        }
        
        .pdf-header-search input {
            padding: 0.6rem 1.2rem;
            border-radius: 50px;
            border: none;
            width: 100%;
            transition: var(--pdf-header-transition);
            font-family: 'Poppins', sans-serif;
            background: rgba(255, 255, 255, 0.9);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .pdf-header-search input:focus {
            outline: none;
            box-shadow: 0 0 0 2px var(--pdf-header-accent);
            background: white;
        }
        
        .pdf-header-search button {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--pdf-header-primary);
            cursor: pointer;
            font-size: 1rem;
            transition: var(--pdf-header-transition);
        }
        
        .pdf-header-search button:hover {
            color: var(--pdf-header-accent);
            transform: translateY(-50%) scale(1.1);
        }
        
        /* Search Results Styling */
        .pdf-search-results {
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            max-height: 400px;
            overflow-y: auto;
            background: white;
            border-radius: 0 0 8px 8px;
            box-shadow: var(--pdf-header-shadow);
            z-index: 1000;
            display: none;
            transform-origin: top;
            animation: pdf-fadeIn 0.2s ease-out;
        }
        
        @keyframes pdf-fadeIn {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .pdf-search-result-item {
            padding: 0.8rem 1rem;
            transition: var(--pdf-header-transition);
            display: block;
            text-decoration: none;
            color: var(--pdf-header-text);
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .pdf-search-result-item:last-child {
            border-bottom: none;
        }
        
        .pdf-search-result-item:hover {
            background: rgba(108, 99, 255, 0.08);
            transform: translateX(3px);
        }
        
        .pdf-search-result-item h4 {
            color: var(--pdf-header-primary);
            margin-bottom: 0.3rem;
            font-size: 1rem;
        }
        
        .pdf-search-result-item p {
            font-size: 0.85rem;
            color: var(--pdf-header-text-light);
            margin-bottom: 0.3rem;
            line-height: 1.4;
        }
        
        .pdf-search-result-item small {
            font-size: 0.75rem;
            color: var(--pdf-header-accent);
            display: block;
            font-weight: 500;
        }
        
        .pdf-no-results {
            padding: 1rem;
            color: var(--pdf-header-text-light);
            font-style: italic;
            text-align: center;
        }
        
        /* Mobile Menu Button */
        .pdf-mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
            transition: var(--pdf-header-transition);
            z-index: 1001;
            margin-left: 1rem;
        }
        
        .pdf-mobile-menu-btn:hover {
            color: var(--pdf-header-accent);
            transform: rotate(360deg);
        }
        
        /* Mobile Search Button */
        .pdf-mobile-search-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.2rem;
            margin-left: 1rem;
            cursor: pointer;
            transition: var(--pdf-header-transition);
            z-index: 1001;
        }
        
        .pdf-mobile-search-btn:hover {
            color: var(--pdf-header-accent);
            transform: scale(1.1);
        }
        
        /* Responsive Design - Mobile Menu */
        @media (max-width: 992px) {
            .pdf-nav-links {
                position: fixed;
                top: var(--pdf-header-height);
                left: -100%;
                width: 50%;
                height: calc(100vh - var(--pdf-header-height));
                background: linear-gradient(135deg, var(--pdf-header-dark), var(--pdf-header-primary-dark));
                flex-direction: column;
                align-items: flex-start;
                padding: 2rem 1.5rem;
                transition: var(--pdf-header-transition);
                box-shadow: 5px 0 15px rgba(0, 0, 0, 0.2);
                z-index: 999;
            }
            
            .pdf-nav-links.pdf-active {
                left: 0;
            }
            
            .pdf-nav-links li {
                margin: 1rem 0;
                width: 100%;
            }
            
            .pdf-nav-links a {
                padding: 0.8rem 1rem;
                font-size: 1.1rem;
                white-space: normal;
                border-radius: 6px;
            }
            
            .pdf-nav-links a:hover {
                background: rgba(255, 255, 255, 0.1);
            }
            
            .pdf-mobile-menu-btn,
            .pdf-mobile-search-btn {
                display: block;
            }
            
            /* Mobile search adjustments */
            .pdf-header-search {
                position: fixed;
                top: var(--pdf-header-height);
                left: 0;
                right: 0;
                width: 100%;
                margin: 0;
                padding: 1rem;
                background: var(--pdf-header-dark);
                z-index: 1000;
                display: none;
                box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            }
            
            .pdf-header-search.pdf-active {
                display: block;
                animation: pdf-slideDown 0.3s ease-out;
            }
            
            @keyframes pdf-slideDown {
                from {
                    transform: translateY(-20px);
                    opacity: 0;
                }
                to {
                    transform: translateY(0);
                    opacity: 1;
                }
            }
            
            .pdf-header-search input {
                width: 100%;
                padding: 0.8rem 1.2rem;
            }
            
            .pdf-logo-text {
                font-size: 1.3rem;
            }
            
            .pdf-logo-icon {
                font-size: 1.8rem;
            }
        }
        
        @media (min-width: 993px) {
            .pdf-mobile-search-btn {
                display: none;
            }
        }
        
        @media (max-width: 576px) {
            .pdf-logo-text {
                font-size: 1.2rem;
            }
            
            .pdf-logo-icon {
                font-size: 1.6rem;
            }
            
            .pdf-nav-links {
                width: 80%;
            }
        }
        
        /* Custom scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }
        
        ::-webkit-scrollbar-thumb {
            background: var(--secondary);
            border-radius: 10px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary);
        }
        
        /* Pulse animation for logo */
        @keyframes pdf-pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
        
        .pdf-logo:hover .pdf-logo-icon {
            animation: pdf-pulse 1.5s infinite;
        }