/**
 * LUVLANG PROFESSIONAL CSS FIXES
 * Addresses all CSS structure improvements for pro-grade UI
 */

/* ============================================================================
   1. EQ FADER THUMB - FIXED HOVER/ACTIVE STATES WITH PROPER CENTERING
   ============================================================================ */

.eq-fader-thumb {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);  /* Always maintain horizontal center */
    width: 40px;
    height: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    cursor: grab;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
    transition: all 0.15s ease;
    z-index: 10;
}

.eq-fader-thumb:hover {
    /* Keep translateX(-50%) for horizontal centering during hover */
    transform: translateX(-50%) scale(1.1);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.6);
}

.eq-fader-thumb:active {
    cursor: grabbing;
    /* Maintain centering while actively dragging */
    transform: translateX(-50%) scale(1.05);
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.8);
}

/* During drag, JavaScript must update only the 'top' property, not transform */
.eq-fader-thumb.dragging {
    transition: none;  /* Disable transitions during drag for smooth movement */
    transform: translateX(-50%);  /* Lock horizontal centering */
}

/* ============================================================================
   2. ANALYSIS PANEL - ENHANCED DISPLAY STATES
   ============================================================================ */

.analysis-panel {
    display: none;  /* Hidden by default until AI analysis runs */
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 12px;
    padding: 20px;
    margin: 15px 0;
    animation: slideIn 0.3s ease-out;
}

.analysis-panel.visible {
    display: block;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================================
   3. CANVAS ELEMENTS - PROPER SIZING AND RENDERING
   ============================================================================ */

.eq-graph-canvas,
.waveform-canvas,
.vectorscope-canvas {
    width: 100%;
    height: 100%;
    display: block;
    background: #0a0a0f;
    border-radius: 8px;
    /* Ensure sharp rendering for audio visualizations */
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-crisp-edges;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

/* Container for canvas elements must have explicit dimensions */
.eq-graph-container,
.waveform-container,
.vectorscope-container {
    position: relative;
    width: 100%;
    height: 200px;
    min-height: 150px;
    border-radius: 8px;
    overflow: hidden;
}

/* ============================================================================
   4. PROFESSIONAL METER IMPROVEMENTS
   ============================================================================ */

.meter-bar {
    position: relative;
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.meter-bar-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0%;
    border-radius: 4px;
    transition: width 0.15s ease-out;
    /* Gradient will be set per meter type in JS */
}

/* Meter value with dynamic color coding */
.meter-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: 8px;
    transition: color 0.2s ease;
}

.meter-value.critical {
    color: #ff4444;
    animation: pulse 1s ease-in-out infinite;
}

.meter-value.warning {
    color: #ffaa00;
}

.meter-value.good {
    color: #00ff88;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* ============================================================================
   5. ENHANCED SLIDER CONTROLS (For custom sliders/faders)
   ============================================================================ */

/* Remove default styling for better custom controls */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    transition: background 0.2s ease;
}

input[type="range"]:hover {
    background: rgba(255, 255, 255, 0.15);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.4);
    transition: all 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.6);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.4);
    transition: all 0.15s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.6);
}

/* ============================================================================
   6. BUTTON IMPROVEMENTS - PROFESSIONAL INTERACTIONS
   ============================================================================ */

.btn-primary,
.legendary-btn {
    position: relative;
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    color: #ffffff;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    overflow: hidden;
}

.btn-primary:hover,
.legendary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.5);
}

.btn-primary:active,
.legendary-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

/* Ripple effect on click */
.btn-primary::after,
.legendary-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn-primary:active::after,
.legendary-btn:active::after {
    width: 200px;
    height: 200px;
}

/* ============================================================================
   7. EXPORT FORMAT GRID - ENHANCED SELECTION
   ============================================================================ */

.export-format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.export-format-btn {
    padding: 10px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.export-format-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(102, 126, 234, 0.5);
    color: #ffffff;
}

.export-format-btn.active {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.3), rgba(118, 75, 162, 0.3));
    border-color: #667eea;
    color: #ffffff;
    box-shadow: 0 0 12px rgba(102, 126, 234, 0.4);
}

/* ============================================================================
   8. RESPONSIVE IMPROVEMENTS
   ============================================================================ */

@media (max-width: 1024px) {
    .eq-fader-thumb {
        width: 35px;
        height: 14px;
    }
    
    .meter-value {
        font-size: 1rem;
    }
    
    .export-format-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .eq-fader-thumb {
        width: 30px;
        height: 12px;
    }
    
    .meter-value {
        font-size: 0.9rem;
    }
    
    .btn-primary,
    .legendary-btn {
        padding: 10px 20px;
        font-size: 0.85rem;
    }
}

/* ============================================================================
   9. ACCESSIBILITY IMPROVEMENTS
   ============================================================================ */

/* Focus states for keyboard navigation */
.eq-fader-thumb:focus,
input[type="range"]:focus,
.btn-primary:focus,
.legendary-btn:focus,
.export-format-btn:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .meter-bar {
        border: 1px solid rgba(255, 255, 255, 0.3);
    }
    
    .eq-fader-thumb {
        border: 2px solid #ffffff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================================================
   10. LOADING STATES
   ============================================================================ */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 15, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    margin-top: 20px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #ffffff;
}

.loading-detail {
    margin-top: 8px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}