/* Global 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;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.95;
    line-height: 1.5;
}

/* Main Content */
main {
    padding: 30px;
}

/* Input Section */
.input-section {
    margin-bottom: 25px;
}

.input-section label {
    display: block;
    font-weight: 600;
    margin-bottom: 10px;
    color: #555;
    font-size: 1rem;
}

#vatInput {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color 0.3s ease;
    line-height: 1.5;
}

#vatInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-info {
    margin-top: 8px;
    font-size: 0.875rem;
    color: #666;
}

/* Action Section */
.action-section {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

button {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    flex: 1;
    position: relative;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: #f5f5f5;
    color: #666;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

/* Progress Section */
.progress-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
    border: 2px solid #e9ecef;
}

.progress-container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 15px;
}

.progress-text {
    font-size: 1rem;
    color: #555;
    font-weight: 500;
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e0e0e0;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Results Section */
.results-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 2px solid #e9ecef;
}

.results-summary {
    margin-bottom: 20px;
    padding: 15px;
    background: white;
    border-radius: 6px;
    border-left: 4px solid #667eea;
}

.results-summary p {
    margin: 8px 0;
    font-size: 0.95rem;
    color: #555;
}

.results-summary strong {
    color: #333;
}

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

.btn-download {
    background: #28a745;
    color: white;
    padding: 14px 40px;
    font-size: 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-download:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(40, 167, 69, 0.4);
}

/* Footer */
footer {
    padding: 20px 30px;
    background: #f8f9fa;
    border-top: 1px solid #e9ecef;
}

.footer-note {
    font-size: 0.875rem;
    color: #666;
    line-height: 1.6;
}

.footer-note strong {
    color: #333;
}

/* Success/Error indicators */
.success-count {
    color: #28a745;
    font-weight: 600;
}

.error-count {
    color: #dc3545;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.875rem;
    }

    main {
        padding: 20px;
    }

    .action-section {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
}