/* ============================================
   Beat Visualizer - 15s Waveform + Click Align
   ============================================ */

.preview-section {
    margin-top: var(--space-xl);
    padding: var(--space-xl);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.preview-section h3 {
    margin: 0 0 var(--space-sm);
    color: var(--nature-green-dark);
    font-size: 1.1rem;
}

.preview-hint {
    margin: 0 0 var(--space-md);
    font-size: 0.85rem;
    color: var(--earth-taupe);
}

/* Waveform Canvas */
.waveform-container {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: grab;
    touch-action: none;
    user-select: none;
}

.waveform-container:active {
    cursor: grabbing;
}

#waveform-canvas {
    display: block;
    width: 100%;
    border-radius: var(--radius-md);
}

/* Controls Row */
.preview-controls {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    flex-wrap: wrap;
}

.playback-btn {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: var(--space-sm) var(--space-md);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all var(--duration-base) var(--ease-smooth);
    color: var(--nature-green-dark);
    font-weight: 500;
    min-width: 90px;
}

.playback-btn:hover:not(:disabled) {
    background: var(--nature-green-pale);
    border-color: var(--nature-green-mid);
    transform: translateY(-1px);
}

.playback-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Detected Info */
.detected-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: linear-gradient(135deg, rgba(84, 140, 38, 0.08) 0%, rgba(218, 165, 32, 0.08) 100%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(84, 140, 38, 0.15);
    font-size: 0.95rem;
    flex-wrap: wrap;
}

.detected-info .info-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.detected-info .info-label {
    color: var(--earth-taupe);
    font-size: 0.85rem;
}

.detected-info .info-value {
    font-weight: 600;
    color: var(--nature-green-dark);
    font-variant-numeric: tabular-nums;
}

.confidence-badge {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.confidence-badge.high {
    background: rgba(84, 140, 38, 0.2);
    color: #2d5016;
}

.confidence-badge.medium {
    background: rgba(218, 165, 32, 0.25);
    color: #8b6914;
}

.confidence-badge.low {
    background: rgba(220, 38, 38, 0.15);
    color: #991b1b;
}

.apply-btn {
    margin-left: auto;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    padding: var(--space-sm) var(--space-md);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(84, 140, 38, 0.3);
    transition: all var(--duration-base) var(--ease-smooth);
}

.apply-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(84, 140, 38, 0.4);
}

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

/* Auto-detect checkbox */
.auto-detect-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9rem;
    color: var(--earth-brown);
    cursor: pointer;
    padding: var(--space-sm) 0;
}

.auto-detect-label input[type="checkbox"] {
    accent-color: var(--nature-green-mid);
    width: 18px;
    height: 18px;
}

/* Analysis loading state */
.analysis-loading {
    display: none;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    color: var(--earth-brown);
    font-size: 0.9rem;
}

.analysis-loading.show {
    display: flex;
}

.analysis-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--nature-green-pale);
    border-top-color: var(--nature-green-mid);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Responsive */
@media (max-width: 639px) {
    .preview-section {
        padding: var(--space-md);
    }

    .preview-controls {
        gap: var(--space-xs);
    }

    .playback-btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.8rem;
        min-width: 70px;
    }

    .detected-info {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .apply-btn {
        margin-left: 0;
        width: 100%;
        text-align: center;
    }
}