/* Reset y configuración base */
* {
    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 */
.header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 20px;
}

.debug-toggle {
    font-size: 0.9rem;
    padding: 8px 16px;
    margin-top: 10px;
}

/* Main content */
.main-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

/* Upload section */
.upload-section {
    margin-bottom: 30px;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    background: #f8f9ff;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    border-color: #764ba2;
    background: #f0f2ff;
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: #4CAF50;
    background: #e8f5e8;
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.upload-area h3 {
    color: #667eea;
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.upload-area p {
    color: #666;
    margin: 10px 0;
    font-size: 1.1rem;
}

.upload-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* Progress section */
.progress-section {
    text-align: center;
    margin: 30px 0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.progress-text {
    color: #666;
    font-size: 1.1rem;
}

/* Preview section */
.preview-section {
    margin-top: 30px;
}

.preview-section h3 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.preview-container {
    max-height: 400px;
    overflow: auto;
    border: 1px solid #ddd;
    border-radius: 10px;
    margin-bottom: 20px;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.preview-table th,
.preview-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.preview-table th {
    background: #f8f9ff;
    color: #667eea;
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

.preview-table tr:hover {
    background: #f8f9ff;
}

/* Action buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 25px;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* Error section */
.error-section {
    text-align: center;
    padding: 40px;
}

.error-message {
    background: #ffebee;
    border: 1px solid #ffcdd2;
    border-radius: 15px;
    padding: 30px;
}

.error-message h3 {
    color: #d32f2f;
    margin-bottom: 15px;
}

.error-message p {
    color: #666;
    margin-bottom: 20px;
}

/* Footer */
.footer {
    text-align: center;
    color: white;
    padding: 20px;
}

.footer p {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 10px;
    backdrop-filter: blur(10px);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 40px 15px;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* Animaciones */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.preview-section,
.error-section {
    animation: fadeIn 0.5s ease;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Debug section */
.debug-section {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #dee2e6;
}

.debug-section h3 {
    color: #495057;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.debug-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.debug-info {
    background: white;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.debug-info h4 {
    color: #495057;
    margin-bottom: 10px;
    font-size: 1rem;
    font-weight: 600;
}

.debug-info p {
    color: #6c757d;
    font-size: 0.9rem;
    margin: 0;
    word-break: break-all;
    max-height: 100px;
    overflow-y: auto;
}

.debug-console {
    background: #212529;
    color: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
    grid-column: 1 / -1;
}

@media (max-width: 768px) {
    .debug-container {
        grid-template-columns: 1fr;
    }
}