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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f7fa;
    color: #2d3748;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: white;
    border-bottom: 1px solid #e2e8f0;
    padding: 20px 30px;
}

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

.header h1 {
    font-size: 1.8rem;
    color: #667eea;
}

.user-info {
    color: #718096;
}

.toolbar {
    background: white;
    border-bottom: 1px solid #e2e8f0;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #4a5568;
    flex-wrap: wrap;
}

.breadcrumb-item {
    cursor: pointer;
    transition: color 0.2s;
}

.breadcrumb-item:hover {
    color: #667eea;
}

.breadcrumb-separator {
    color: #cbd5e0;
}

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

.main-content {
    flex: 1;
    padding: 30px;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.file-list {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid #f7fafc;
    cursor: pointer;
    transition: background 0.2s;
    position: relative;
}

.file-item:hover {
    background: #f7fafc;
}

.file-item:last-child {
    border-bottom: none;
}

.file-icon {
    font-size: 2rem;
    margin-right: 15px;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 3px;
}

.file-meta {
    font-size: 0.85rem;
    color: #a0aec0;
}

.file-actions {
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.file-item:hover .file-actions {
    opacity: 1;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    background: #e2e8f0;
    color: #4a5568;
}

.btn:hover {
    background: #cbd5e0;
    transform: translateY(-1px);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a67d8;
}

.btn-success {
    background: #48bb78;
    color: white;
}

.btn-success:hover {
    background: #38a169;
}

.btn-danger {
    background: #f56565;
    color: white;
}

.btn-danger:hover {
    background: #e53e3e;
}

.btn-secondary {
    background: #718096;
    color: white;
}

.btn-secondary:hover {
    background: #4a5568;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 5px;
    transition: background 0.2s;
}

.btn-icon:hover {
    background: #edf2f7;
}

.loading {
    text-align: center;
    padding: 60px;
    color: #a0aec0;
    font-size: 1.1rem;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #a0aec0;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 15px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #a0aec0;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    transition: background 0.2s;
}

.modal-close:hover {
    background: #f7fafc;
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 20px 25px;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
}

.drop-zone {
    border: 3px dashed #cbd5e0;
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.drop-zone:hover {
    border-color: #667eea;
    background: #f7fafc;
}

.drop-zone.drag-over {
    border-color: #667eea;
    background: #edf2f7;
}

.progress-bar {
    height: 8px;
    background: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s;
    width: 0;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 8px 0;
    z-index: 2000;
    display: none;
    min-width: 180px;
}

.context-menu.active {
    display: block;
}

.context-menu-item {
    padding: 12px 20px;
    cursor: pointer;
    transition: background 0.2s;
}

.context-menu-item:hover {
    background: #f7fafc;
}

.context-menu-item.danger {
    color: #e53e3e;
}

.context-menu-divider {
    height: 1px;
    background: #e2e8f0;
    margin: 5px 0;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .header, .toolbar, .main-content {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 1.4rem;
    }
    
    .file-item {
        padding: 12px 15px;
    }
    
    .file-icon {
        font-size: 1.5rem;
        margin-right: 10px;
    }
    
    .file-actions {
        opacity: 1;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-actions {
        justify-content: stretch;
    }
    
    .toolbar-actions .btn {
        flex: 1;
    }
}