/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #e74c3c;
}

.nav-logo i {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #e74c3c;
}

.btn-premium {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 150px 0 100px;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-search {
    position: relative;
    max-width: 500px;
    margin: 0 auto;
}

.hero-search input {
    width: 100%;
    padding: 15px 50px 15px 20px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    outline: none;
}

.hero-search i {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
}

/* Tools Section */
.tools-section {
    padding: 80px 0;
}

.tool-categories {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.category-btn {
    background: white;
    border: 2px solid #e0e0e0;
    padding: 10px 25px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-btn:hover,
.category-btn.active {
    background: #e74c3c;
    color: white;
    border-color: #e74c3c;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.tool-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
    border-color: #e74c3c;
}

.tool-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.merge-icon { background: linear-gradient(135deg, #667eea, #764ba2); }
.split-icon { background: linear-gradient(135deg, #f093fb, #f5576c); }
.compress-icon { background: linear-gradient(135deg, #4facfe, #00f2fe); }
.convert-icon { background: linear-gradient(135deg, #43e97b, #38f9d7); }
.edit-icon { background: linear-gradient(135deg, #fa709a, #fee140); }
.security-icon { background: linear-gradient(135deg, #a8edea, #fed6e3); }

.tool-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.tool-card p {
    color: #666;
    line-height: 1.6;
}

/* Coming Soon Cards */
.tool-card.coming-soon {
    opacity: 0.6;
    cursor: not-allowed;
    position: relative;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border: 2px dashed #dee2e6;
}

.tool-card.coming-soon:hover {
    transform: none;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #dee2e6;
}

.tool-card.coming-soon .tool-icon {
    background: linear-gradient(135deg, #6c757d, #495057);
    opacity: 0.7;
}

.view-icon {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
}

.tool-card.coming-soon h3 {
    color: #6c757d;
}

.tool-card.coming-soon p {
    color: #6c757d;
}

.coming-soon-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: linear-gradient(135deg, #ffc107, #ff8c00);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(255, 193, 7, 0.3);
}

/* PDF Preview Styles */
.pdf-preview-container {
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

/* PDF Viewer Styles */
.pdf-viewer-container {
    width: 100%;
    height: 600px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #f8f9fa;
    position: relative;
    overflow: hidden;
    margin: 15px 0;
}

.pdf-viewer-toolbar {
    background: #fff;
    border-bottom: 1px solid #ddd;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.pdf-viewer-controls {
    display: flex;
    align-items: center;
    gap: 5px;
}

.pdf-viewer-controls button {
    background: #4a90e2;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s;
}

.pdf-viewer-controls button:hover {
    background: #357abd;
}

.pdf-viewer-controls button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.pdf-viewer-page-info {
    margin-left: auto;
    font-size: 14px;
    color: #666;
}

.pdf-viewer-zoom {
    display: flex;
    align-items: center;
    gap: 5px;
}

.pdf-viewer-zoom input {
    width: 60px;
    padding: 4px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    text-align: center;
}

.pdf-viewer-canvas-container {
    width: 100%;
    height: calc(100% - 60px);
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
}

.pdf-viewer-canvas {
    border: 1px solid #ccc;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    background: white;
}

.pdf-viewer-search {
    position: absolute;
    top: 10px;
    right: 10px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 5px 10px;
    display: none;
}

.pdf-viewer-search input {
    border: none;
    outline: none;
    padding: 5px;
    width: 200px;
}

.pdf-viewer-search button {
    background: #4a90e2;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 5px;
}

.pdf-preview-container h4 {
    margin: 0 0 15px 0;
    color: #333;
    font-size: 1.1rem;
}

.pdf-preview-scroll {
    max-height: 300px;
    overflow-y: auto;
    padding: 10px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.pdf-page-thumbnail {
    display: inline-block;
    margin: 5px;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 120px;
    flex-shrink: 0;
}

.pdf-page-thumbnail:hover {
    border-color: #e74c3c;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.pdf-page-thumbnail.selected {
    border-color: #e74c3c;
    background-color: #fef5f5;
}

.pdf-preview-info {
    margin-top: 10px;
    color: #666;
    font-size: 0.9rem;
    font-style: italic;
}

/* Combine PDF Preview Styles */
.file-preview-item {
    display: flex;
    align-items: center;
    padding: 10px;
    margin: 5px 0;
    background: white;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: move;
    transition: all 0.3s ease;
    user-select: none;
}

.file-preview-item:hover {
    border-color: #e74c3c;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.file-preview-item.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
}

.file-preview-item.drag-over {
    border-color: #e74c3c;
    background-color: #fef5f5;
}

/* Features Section */
.features-section {
    background: white;
    padding: 80px 0;
}

.features-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
}

.feature-card i {
    font-size: 3rem;
    color: #e74c3c;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

.modal-header {
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    color: #333;
    font-size: 1.5rem;
}

.close {
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: #999;
    transition: color 0.3s ease;
}

.close:hover {
    color: #e74c3c;
}

.modal-body {
    padding: 2rem;
}

.upload-area {
    border: 3px dashed #e0e0e0;
    border-radius: 15px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.upload-area.dragover {
    border-color: #e74c3c;
    background-color: #fef5f5;
}

.upload-content i {
    font-size: 3rem;
    color: #e74c3c;
    margin-bottom: 1rem;
}

.upload-content p {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.upload-subtitle {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1.5rem !important;
}

.btn-upload {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-upload:hover {
    background: #c0392b;
    transform: translateY(-2px);
}

.file-list {
    margin-bottom: 2rem;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-info i {
    font-size: 1.5rem;
    color: #e74c3c;
}

.file-details h4 {
    color: #333;
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.file-details p {
    color: #666;
    font-size: 0.8rem;
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    padding: 5px 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.btn-remove {
    background: #e74c3c;
    color: white;
}

.btn-remove:hover {
    background: #c0392b;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.btn-primary {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.btn-secondary {
    background: white;
    color: #333;
    border: 2px solid #e0e0e0;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

.progress-area {
    margin-top: 2rem;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: #e0e0e0;
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    width: 0%;
    transition: width 0.3s ease;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: #ecf0f1;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #e74c3c;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-logo i {
    color: #e74c3c;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 1rem;
    text-align: center;
    color: #bdc3c7;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { 
        opacity: 0;
        transform: translateY(-50px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

/* Educational Content Section */
.educational-section {
    background: #f8f9fa;
    padding: 80px 0;
}

.educational-section h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 3rem;
    font-weight: 600;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.content-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border-left: 4px solid #e74c3c;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.content-card h3 {
    color: #2c3e50;
    font-size: 1.4rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.content-card p {
    color: #555;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.content-card ul {
    list-style: none;
    padding: 0;
}

.content-card li {
    position: relative;
    padding: 0.5rem 0 0.5rem 1.5rem;
    color: #666;
    line-height: 1.6;
}

.content-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #e74c3c;
    font-weight: bold;
}

/* FAQ Section */
.faq-section {
    background: white;
    padding: 80px 0;
}

.faq-section h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 3rem;
    font-weight: 600;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.faq-item {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #e9ecef;
    transition: background-color 0.3s ease;
}

.faq-item:hover {
    background: #e9ecef;
}

.faq-item h3 {
    color: #2c3e50;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.faq-item p {
    color: #555;
    line-height: 1.7;
}

/* About Section */
.about-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 0;
    color: white;
}

.about-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    font-weight: 600;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.about-text h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
    font-weight: 600;
}

.about-text ul {
    list-style: none;
    padding: 0;
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
}

.about-text li {
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-size: 1.05rem;
}

.about-text li:last-child {
    border-bottom: none;
}

.about-text strong {
    color: #ffd700;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-categories {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 1rem;
    }
    
    .category-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }
    
    .modal-content {
        width: 95%;
        margin: 2% auto;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .tool-card {
        padding: 1.5rem;
    }
    
    .tool-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .content-card {
        padding: 1.5rem;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .faq-item {
        padding: 1.5rem;
    }
    
    .educational-section h2,
    .faq-section h2,
    .about-section h2 {
        font-size: 2rem;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }