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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

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

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 3rem;
    color: #fff;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

.logo h1 {
    font-size: 3rem;
    font-weight: 700;
    text-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Upload Section */
.upload-section {
    margin-bottom: 50px;
}

.upload-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 40px;
    text-align: center;
    background: linear-gradient(145deg, #f8f9ff, #e8ecff);
    position: relative;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 30px;
}

.upload-area:hover {
    border-color: #764ba2;
    background: linear-gradient(145deg, #f0f4ff, #e0e8ff);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.upload-area.dragover {
    border-color: #4CAF50;
    background: linear-gradient(145deg, #f0fff0, #e8f5e8);
    transform: scale(1.02);
}

.upload-icon i {
    font-size: 4rem;
    color: #667eea;
    margin-bottom: 20px;
    display: block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.upload-area h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: #333;
    font-weight: 600;
}

.upload-area p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 30px;
}

.browse-text {
    color: #667eea;
    font-weight: 600;
    text-decoration: underline;
    cursor: pointer;
}

.browse-text:hover {
    color: #764ba2;
}

#fileInput {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-info {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.upload-info p {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: #777;
    margin: 0;
}

.upload-info i {
    color: #667eea;
}

.upload-btn {
    width: 100%;
    padding: 18px 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.upload-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

.upload-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
}

/* Files Section */
.files-section {
    margin-bottom: 50px;
}

.files-section h2 {
    color: white;
    font-size: 2rem;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.files-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 15px;
    background: linear-gradient(145deg, #f8f9ff, #ffffff);
    border: 1px solid rgba(102, 126, 234, 0.1);
    transition: all 0.3s ease;
}

.file-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    border-color: rgba(102, 126, 234, 0.3);
}

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

.file-info {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 1;
}

.file-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.file-icon .fa-file-pdf {
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
}

.file-icon .fa-file-image {
    background: linear-gradient(135deg, #4ecdc4, #44a08d);
}

.file-icon .fa-file-word {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.file-details h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.file-details p {
    font-size: 0.9rem;
    color: #777;
}

.file-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.download-btn {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
}

.share-btn {
    background: linear-gradient(135deg, #2196F3, #1976D2);
    color: white;
}

.delete-btn {
    background: linear-gradient(135deg, #f44336, #d32f2f);
    color: white;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Statistics Section */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 5px;
}

.stat-info p {
    color: #777;
    font-size: 1rem;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    border-radius: 20px;
    padding: 0;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
    transform: scale(0.7);
    transition: all 0.3s ease;
    overflow: hidden;
}

.modal-overlay.show .modal {
    transform: scale(1);
}

.modal-header {
    padding: 30px 30px 20px;
    text-align: center;
    border-bottom: 1px solid #eee;
}

.error-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
    animation: shake 0.5s ease-in-out;
}

.success-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4CAF50, #45a049);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
    animation: bounce 0.6s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
}

.modal-body {
    padding: 20px 30px;
    text-align: center;
}

.modal-body p {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 10px;
}

.error-details {
    font-size: 0.95rem;
    color: #777;
    margin-bottom: 0;
}

.modal-footer {
    padding: 20px 30px 30px;
    display: flex;
    gap: 15px;
    justify-content: center;
}

.modal-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.modal-btn.primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.modal-btn.secondary {
    background: #f5f5f5;
    color: #333;
    border: 1px solid #ddd;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.spinner {
    text-align: center;
    color: white;
}

.spinner-ring {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

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

.spinner p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .upload-container {
        padding: 25px;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .upload-area h3 {
        font-size: 1.4rem;
    }
    
    .upload-info {
        flex-direction: column;
        gap: 15px;
    }
    
    .file-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .file-actions {
        align-self: stretch;
        justify-content: flex-end;
    }
    
    .stats-section {
        grid-template-columns: 1fr;
    }
    
    .modal {
        margin: 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .upload-area {
        padding: 30px 15px;
    }
    
    .files-container {
        padding: 20px;
    }
    
    .stat-card {
        padding: 20px;
    }
    
    .modal-footer {
        flex-direction: column;
    }
    
    .modal-btn {
        width: 100%;
    }
    
    .footer {
        padding: 40px 20px 20px;
    }
    
    .social-links {
        justify-content: center;
    }
}

/* Footer Styles */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 60px 40px 20px;
    margin-top: 80px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2, #667eea);
    background-size: 200% 100%;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ecf0f1;
    position: relative;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo i {
    font-size: 2rem;
    color: #667eea;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.footer-logo h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #ecf0f1;
    margin: 0;
}

.footer-description {
    font-size: 1rem;
    line-height: 1.6;
    color: #bdc3c7;
    margin-bottom: 25px;
    max-width: 300px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ecf0f1;
    text-decoration: none;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-link:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    border-color: transparent;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    padding: 5px 0;
}

.footer-links a:hover {
    color: #667eea;
    transform: translateX(5px);
}

.footer-links a i {
    font-size: 0.9rem;
    width: 16px;
    opacity: 0.7;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 25px;
    margin-top: 40px;
}

.footer-bottom-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.footer-bottom p {
    color: #95a5a6;
    font-size: 0.9rem;
    margin: 0;
}

.footer-bottom-links {
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-bottom-links a {
    color: #bdc3c7;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-bottom-links a:hover {
    color: #667eea;
}

.footer-divider {
    color: #7f8c8d;
    font-size: 0.8rem;
}