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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.input-section, .output-section {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.input-section h2, .output-section h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.4rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 8px;
}

textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    transition: border-color 0.3s ease;
}

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

.controls {
    margin-top: 15px;
    display: flex;
    gap: 10px;
}

.output-controls {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
    transform: translateY(-2px);
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
    transform: translateY(-2px);
}

.status-message {
    color: #28a745;
    font-weight: 600;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.status-message.show {
    opacity: 1;
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-warning:hover {
    background: #e0a800;
    transform: translateY(-2px);
}

.import-instructions {
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.import-instructions h4 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.import-instructions ol {
    margin-left: 20px;
}

.import-instructions li {
    margin-bottom: 5px;
    color: #555;
    line-height: 1.4;
}

.import-instructions strong {
    color: #667eea;
    font-weight: 600;
}

/* Enhanced parser options */
.options {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #dee2e6;
    margin: 15px 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    color: #495057;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.features {
    background: #e8f5e8;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #28a745;
    margin: 20px 0;
}

.features ul {
    margin: 10px 0;
    padding-left: 20px;
}

.features li {
    margin: 8px 0;
}

footer {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.info-section h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.info-section ol {
    margin-left: 20px;
}

.info-section li {
    margin-bottom: 8px;
    color: #555;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .controls, .output-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        margin-bottom: 10px;
    }
}

/* Loading animation */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.2), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}