/* Dark Theme Neural Cello Web App */

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-card: #141414;
    --border-color: #2a2a2a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-primary: #4a9eff;
    --accent-secondary: #00d4aa;
    --error-color: #ff4444;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #0f0f1a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(74, 158, 255, 0.02);
}

.upload-area:hover {
    border-color: var(--accent-primary);
    background: rgba(74, 158, 255, 0.05);
}

.upload-area.dragover {
    border-color: var(--accent-secondary);
    background: rgba(0, 212, 170, 0.1);
}

.upload-icon {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.upload-content p {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.file-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(74, 158, 255, 0.1);
    border-radius: 6px;
    margin-top: 1rem;
}

.btn-small {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-small:hover {
    border-color: var(--error-color);
    color: var(--error-color);
}

/* Controls */
.control-group {
    margin-bottom: 2rem;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}

.value-display {
    color: var(--accent-primary);
    font-weight: 600;
    min-width: 50px;
    text-align: right;
}

/* Sliders */
.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    transition: all 0.3s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px var(--accent-primary);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    transition: all 0.3s;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Select Control */
.select-control {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.select-control:hover {
    border-color: var(--accent-primary);
}

.select-control:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.2);
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 0.75rem;
    cursor: pointer;
}

/* Radio Toggle Group */
.toggle-group {
    display: flex;
    gap: 1rem;
    padding: 0.5rem;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.toggle-group input[type="radio"] {
    display: none;
}

.toggle-label {
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
}

.toggle-group input[type="radio"]:checked + .toggle-label {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    box-shadow: 0 2px 8px rgba(74, 158, 255, 0.3);
}

.toggle-label:hover {
    background: rgba(74, 158, 255, 0.1);
    border-color: var(--border-color);
}

/* Buttons */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 150px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #3a8eef);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 158, 255, 0.4);
}

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

.btn-secondary {
    background: transparent;
    border: 2px solid var(--accent-secondary);
    color: var(--accent-secondary);
}

.btn-secondary:hover {
    background: var(--accent-secondary);
    color: var(--bg-primary);
}

.btn-download {
    background: linear-gradient(135deg, var(--success-color), #00cc70);
    color: var(--bg-primary);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 255, 136, 0.4);
}

.actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
    margin-left: 0.5rem;
}

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

/* Status Messages */
.status-message {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 500;
}

.status-message.info {
    background: rgba(74, 158, 255, 0.1);
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}

.status-message.success {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.status-message.error {
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.status-message.warning {
    background: rgba(255, 170, 0, 0.1);
    border: 1px solid var(--warning-color);
    color: var(--warning-color);
}

/* Audio Player */
audio {
    width: 100%;
    margin-bottom: 1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}