/* 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;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header styles */
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;
}

/* Form styles */
.generator-form {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

.form-group select,
.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: #fafafa;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: #667eea;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group select:hover,
.form-group input:hover {
    border-color: #c1c9d2;
}

/* Button styles */
.generate-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

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

.generate-btn:active {
    transform: translateY(0);
}

.generate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Status section */
.status-section,
.results-section,
.error-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.status-section h2,
.results-section h2,
.error-section h2 {
    margin-bottom: 20px;
    color: #333;
    font-size: 1.5rem;
}

.status-info p {
    margin-bottom: 10px;
    font-size: 1rem;
}

#taskId {
    font-family: 'Courier New', monospace;
    background: #f0f0f0;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9rem;
}

/* Progress bar */
.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #e1e5e9;
    border-radius: 10px;
    overflow: hidden;
    margin: 15px 0;
}

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

#progressText {
    text-align: center;
    font-weight: 600;
    color: #667eea;
}

/* Results section */
.results-info {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.results-info p {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.results-info strong {
    color: #555;
}

.tracks-container h3,
.download-section h3 {
    margin-bottom: 15px;
    color: #555;
    font-size: 1.2rem;
}

.tracks-list {
    display: grid;
    gap: 15px;
    margin-bottom: 30px;
}

.track-item {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.track-info h4 {
    margin-bottom: 5px;
    color: #333;
    font-size: 1rem;
}

.track-info p {
    color: #666;
    font-size: 0.9rem;
}

.track-buttons-container {
    display: flex;
    flex-direction: row;
    gap: 16px;
    width: 40%;
}

.track-download, .track-regenerate {
    background: #667eea;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.track-regenerate {
    width: 100%;
}

.track-download:hover, .track-regenerate:hover {
    background: #5a6fd8;
    transform: translateY(-1px);
}

.track-download:disabled, .track-regenerate:disabled {
    cursor: default;
    transform: none;
}

.download-all-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.download-all-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
}

.download-all-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.download-all-btn.loading {
    background: linear-gradient(135deg, #6c757d 0%, #5a6268 100%);
    pointer-events: none;
}

.download-all-btn .btn-spinner {
    display: inline-block;
    margin-right: 8px;
    animation: spin 1s linear infinite;
}

/* Error section */
.error-section {
    border-left: 4px solid #dc3545;
}

.error-section h2 {
    color: #dc3545;
}

#errorMessage {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #f5c6cb;
}

.retry-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.retry-btn:hover {
    background: #c82333;
    transform: translateY(-1px);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .generator-form,
    .status-section,
    .results-section,
    .error-section {
        padding: 20px;
    }
    
    .track-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .track-download {
        align-self: stretch;
        text-align: center;
    }
}

/* Loading animation */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

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

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Separated tracks styling */
.separated-tracks-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid #e9ecef;
}

.separated-tracks-section h3 {
    color: #495057;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.separated-track {
    border-left: 4px solid #28a745;
    background: linear-gradient(135deg, #f8fff9 0%, #e8f5e8 100%);
}

.separated-track .track-info h4 {
    color: #155724;
}

.separated-track .track-info p {
    color: #6c757d;
    font-style: italic;
}

.separated-track .track-download {
    background: #28a745;
    border-color: #28a745;
}

.separated-track .track-regenerate, .separated-track .track-regenerate:hover {
    background-color: #e0a800;
    border-color: #e0a800;
}

.separated-track .track-regenerate:hover {
    border-color: #b58c13;
}

.separated-track .track-download:hover {
    background: #218838;
    border-color: #1e7e34;
}

.separated-track .track-download:disabled, .separated-track .track-regenerate:disabled{
    background: #b6b6b6;
    border-color: #a7a7a7;
    cursor: default;
}