/* ======================
   🎵 Transposer - Professional Enhanced Styling
   ====================== */

/* === Card visibility === */
#audioControls,
#resultsCard {
    display: block;
}

/* ======================
   📐 Card Centering & Layout
   ====================== */
/* Center all cards within main content - ensure same width */
.main-content .card,
.main-content form .card {
    max-width: 1200px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

/* Center forms and headers */
.main-content > .content-header,
.main-content > form {
    max-width: 1200px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

/* Ensure form cards match other cards exactly - same width as regular cards */
.main-content > form {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.main-content > form > .card {
    max-width: 100%;
    width: 100%;
    margin-left: 0;
    margin-right: 0;
}

/* Center cards nested in forms */
.main-content form .card {
    max-width: 1200px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

/* Larger screens - wider content */
@media (min-width: 1400px) {
    .main-content .card,
    .main-content > .content-header,
    .main-content > form,
    .main-content form .card {
        max-width: 1400px;
    }
}

/* Tablet - maintain centering */
@media (max-width: 1200px) and (min-width: 769px) {
    .main-content .card,
    .main-content > .content-header,
    .main-content > form,
    .main-content form .card {
        max-width: 95%;
    }
}

/* Mobile - full width with padding */
@media (max-width: 768px) {
    .main-content .card,
    .main-content > .content-header,
    .main-content > form,
    .main-content form .card {
        max-width: 100%;
    }
}

/* ======================
   🎴 Enhanced Cards with Glassmorphism
   ====================== */

/* Ensure all text is visible in dark theme */
h1, h2, h3, h4, h5, h6,
.card-header,
.card-body,
.form-label,
label,
.text-dark {
    color: var(--text-primary) !important;
}

/* Override Bootstrap utilities for dark theme */
.text-dark {
    color: var(--text-primary) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.text-primary {
    color: var(--primary-light) !important;
}

.text-secondary {
    color: var(--text-secondary) !important;
}

/* Ensure all text elements are visible */
p, span, small, strong, em, li {
    color: var(--text-primary);
}

small {
    color: var(--text-muted);
}

.bg-light {
    background: rgba(30, 41, 59, 0.6) !important;
    border-color: var(--glass-border) !important;
}

.bg-light p,
.bg-light small {
    color: var(--text-primary) !important;
}
.card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    overflow: hidden;
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.3);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    background: rgba(30, 41, 59, 0.5);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.card-header h5 {
    color: var(--text-primary) !important;
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0;
    padding: 0;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Override Bootstrap text-dark for dark theme */
.text-dark {
    color: var(--text-primary) !important;
}

.card-header h5 i {
    color: var(--primary-color);
    transition: all var(--transition-base);
}

.card:hover .card-header h5 i {
    color: var(--primary-light);
    transform: scale(1.1);
}

.card-body {
    padding: var(--space-xl);
}

.card-body h6,
.form-label {
    color: var(--text-primary) !important;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--space-md);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.card-body h6 i {
    color: var(--primary-color);
    opacity: 0.8;
}

/* ======================
   📁 Enhanced Upload Area
   ====================== */
.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: all var(--transition-base);
    cursor: default;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    min-height: auto;
    pointer-events: auto;
}

/* Upload area - allow drag/drop but not click */
.upload-area:not(.disabled) .btn {
    pointer-events: auto;
}

/* Prevent click on upload area, but allow drag/drop */
.upload-area:not(.disabled) {
    pointer-events: auto;
}

.upload-area:not(.disabled) .upload-content {
    pointer-events: none;
}

.upload-area:not(.disabled) .upload-content .btn {
    pointer-events: auto;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left var(--transition-slow);
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.15);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.upload-area.dragover {
    border-style: solid;
    background: rgba(99, 102, 241, 0.2);
}

.upload-content {
    pointer-events: none;
    position: relative;
    z-index: 1;
}

/* Remove cloud icon - no longer needed */

.upload-area.disabled {
    opacity: 0.5;
    pointer-events: none;
    cursor: not-allowed;
}

.filename-preview {
    display: inline-block;
    max-width: 300px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    vertical-align: bottom;
    padding: var(--space-sm) var(--space-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    margin-top: var(--space-md);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
    font-weight: 500;
    font-size: 0.9rem;
}

/* Truncated filename in alert */
.alert .filename-preview {
    max-width: 250px;
    display: inline-block;
}

/* Responsive filename truncation */
@media (max-width: 768px) {
    .filename-preview {
        max-width: 200px;
    }
    
    .alert .filename-preview {
        max-width: 150px;
    }
}

/* ======================
   🎚️ Professional Slider Styling
   ====================== */
.slider-container {
    margin-bottom: var(--space-lg);
    position: relative;
    padding: var(--space-lg);
    background: rgba(30, 41, 59, 0.5);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-base);
}

.slider-container:hover {
    background: rgba(30, 41, 59, 0.6);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--shadow-md);
}

.slider-container .form-range {
    height: 8px;
    background: transparent;
    border-radius: var(--radius-md);
    appearance: none;
    outline: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.slider-container .form-range:focus {
    outline: none;
}

.slider-container .form-range::-webkit-slider-track,
.slider-container .form-range::-moz-range-track {
    background: linear-gradient(90deg, var(--dark-border-strong), var(--dark-border));
    height: 8px;
    border-radius: var(--radius-md);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider-container .form-range::-webkit-slider-thumb,
.slider-container .form-range::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: 3px solid var(--dark-surface);
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(99, 102, 241, 0.4);
    cursor: grab;
    transition: all var(--transition-base);
    position: relative;
}

.slider-container .form-range::-webkit-slider-thumb:active,
.slider-container .form-range::-moz-range-thumb:active {
    cursor: grabbing;
    transform: scale(1.2);
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.slider-container .form-range::-webkit-slider-thumb:hover,
.slider-container .form-range::-moz-range-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--primary-light);
}

.slider-value {
    position: absolute;
    top: -40px;
    right: 0;
    background: var(--gradient-primary);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    transform: translateX(50%);
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    pointer-events: none;
    z-index: 10;
}

.slider-value::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--primary-color);
    filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.2));
}

/* ======================
   🔘 Professional Buttons & Toggles
   ====================== */
/* Enhanced form-check styling for consistent toggle */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: 0;
}

.form-check-input {
    width: 2.5rem !important;
    height: 1.25rem !important;
    min-width: 2.5rem;
    flex-shrink: 0;
    border: 2px solid var(--dark-border-strong);
    transition: all var(--transition-base);
    cursor: pointer;
    margin-top: 0;
    order: 1;
}

.form-check-input:checked {
    background: var(--gradient-primary) !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-check-input:focus {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
    outline: none;
}

.form-check-input:not(:checked) {
    background-color: var(--dark-border-strong) !important;
}

.form-check-label {
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: color var(--transition-base);
    margin-bottom: 0 !important;
    order: 2;
    white-space: nowrap;
}

.form-check:hover .form-check-label {
    color: var(--text-primary);
}

/* Ensure form-switch displays correctly - single toggle button */
.form-check.form-switch {
    display: inline-flex !important;
    align-items: center;
    padding: 0;
    margin: 0;
    gap: var(--space-sm);
}

.form-check.form-switch .form-check-input {
    width: 2.5rem !important;
    height: 1.25rem !important;
    margin: 0 !important;
    flex-shrink: 0;
    float: none !important;
    position: relative !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* Ensure toggle is visible in all states - override Bootstrap completely */
.form-check.form-switch .form-check-input {
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
}

/* Ensure toggle is visible when checked - override all possible hiding */
.form-check.form-switch .form-check-input:checked {
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
    position: relative !important;
    z-index: 1 !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
}

/* Custom toggle switch styling - ensure always visible */
.form-check.form-switch .form-check-input {
    width: 2.5rem !important;
    height: 1.25rem !important;
    background-color: var(--dark-border-strong) !important;
    border: 2px solid var(--dark-border-strong) !important;
    border-radius: 0.625rem !important;
    position: relative !important;
    cursor: pointer !important;
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
}

/* Toggle knob - always visible white circle */
.form-check.form-switch .form-check-input::after {
    content: '' !important;
    position: absolute !important;
    width: 0.875rem !important;
    height: 0.875rem !important;
    left: 0.1875rem !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    background: white !important;
    border-radius: 50% !important;
    transition: transform 0.3s ease !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3) !important;
    pointer-events: none !important;
}

.form-check.form-switch .form-check-input:checked::after {
    transform: translateY(-50%) translateX(1.125rem) !important;
}

.form-check.form-switch .form-check-input:checked {
    background: var(--gradient-primary) !important;
    border-color: var(--primary-color) !important;
}

.form-check.form-switch .form-check-label {
    margin-left: 0 !important;
    margin-bottom: 0 !important;
    padding-left: 0 !important;
    flex-shrink: 0;
}

/* Hide any duplicate labels or inputs */
.form-check.form-switch input[type="checkbox"]:not(.form-check-input) {
    display: none !important;
}

.form-check.form-switch label:not(.form-check-label) {
    display: none !important;
}

/* Enhanced Buttons */
.btn {
    border-radius: var(--radius-lg);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    text-decoration: none;
    cursor: pointer;
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-md);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg), var(--shadow-glow-hover);
}

.btn-success {
    background: var(--gradient-success);
    color: white;
}

.btn-secondary {
    background: rgba(100, 116, 139, 0.2);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(100, 116, 139, 0.3);
    border-color: rgba(100, 116, 139, 0.5);
}

.btn-outline-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

.btn-outline-secondary:hover {
    background: rgba(100, 116, 139, 0.1);
    color: var(--text-primary);
    border-color: rgba(100, 116, 139, 0.3);
}

.btn-sm {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.125rem;
}

/* ======================
   🌊 Enhanced Waveform Display
   ====================== */
.waveform-container {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: var(--space-md) 0;
    border-radius: var(--radius-lg);
    position: relative;
}

#waveform {
    width: 100%;
    min-height: 120px;
    background: rgba(15, 23, 42, 0.6);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-base);
}

#waveform:hover {
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3), var(--shadow-md);
}

.waveform.channel {
    height: 50px;
}

.card.waveform-card {
    margin-bottom: var(--space-xl);
}

.card.waveform-card:hover {
    transform: translateY(-2px);
}

/* ======================
   🔊 Audio Player
   ====================== */
.audio-controls {
    background: var(--dark-surface);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--dark-border);
}

.audio-controls h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

/* ======================
   ⏳ Enhanced Progress Bars
   ====================== */
.progress {
    height: 8px;
    background-color: rgba(51, 65, 85, 0.5);
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.progress-bar {
    background: var(--gradient-primary);
    transition: width var(--transition-base);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.badge {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    letter-spacing: 0.02em;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-base);
}

.badge:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.badge.bg-info {
    background: var(--gradient-accent);
    color: white;
}

.badge.bg-success {
    background: var(--gradient-success);
    color: white;
}

/* ======================
   🌀 Enhanced Spinner & Loading States
   ====================== */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--primary-color);
    border-top: 3px solid transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* ======================
   📝 Enhanced Form Elements
   ====================== */
.form-select,
.form-control {
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    padding: var(--space-md);
    transition: all var(--transition-base);
    font-size: 1rem;
}

.form-select:focus,
.form-control:focus {
    background: rgba(30, 41, 59, 0.8);
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2), var(--shadow-md);
}

.form-select:hover,
.form-control:hover {
    border-color: rgba(99, 102, 241, 0.3);
}

/* Alert enhancements */
.alert {
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow-md);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.alert:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.alert-info {
    border-left: 4px solid var(--accent-color);
    background: rgba(6, 182, 212, 0.1);
}

.alert-success {
    border-left: 4px solid var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

/* Reduced height for filename alert */
.alert-success.py-2 {
    padding-top: var(--space-sm) !important;
    padding-bottom: var(--space-sm) !important;
    min-height: auto;
}

.alert-warning {
    border-left: 4px solid var(--warning-color);
    background: rgba(245, 158, 11, 0.1);
}

.alert-danger {
    border-left: 4px solid var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

/* Enhanced visibility for vocal range status alerts */
.alert-sm {
    padding: var(--space-md);
    font-size: 0.95rem;
    font-weight: 500;
    border-left-width: 3px;
}

#rangeStatus .alert {
    color: var(--text-primary) !important;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

#rangeStatus .alert-info {
    background: rgba(6, 182, 212, 0.2) !important;
    border-left-color: var(--accent-color);
    color: var(--accent-light) !important;
}

#rangeStatus .alert-success {
    background: rgba(16, 185, 129, 0.2) !important;
    border-left-color: var(--success-color);
    color: var(--success-light) !important;
}

#rangeStatus .alert-warning {
    background: rgba(245, 158, 11, 0.2) !important;
    border-left-color: var(--warning-color);
    color: var(--warning-light) !important;
}

#rangeStatus .alert-danger {
    background: rgba(239, 68, 68, 0.2) !important;
    border-left-color: var(--danger-color);
    color: var(--danger-light) !important;
}

/* ======================
   ✨ Animations & Page Load Effects
   ====================== */

/* Fade in up animation for cards */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.card {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }
.card:nth-child(4) { animation-delay: 0.4s; }
.card:nth-child(5) { animation-delay: 0.5s; }
.card:nth-child(6) { animation-delay: 0.6s; }

/* Pulse animation for active elements */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Bounce animation for attention */
@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.bounce {
    animation: bounce 1s ease-in-out infinite;
}

/* Slide in from right */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Scale in animation */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.scale-in {
    animation: scaleIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ======================
   📱 Responsive Design
   ====================== */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) and (min-width: 769px) {
    .card {
        margin-bottom: 1.5rem;
    }
    
    .upload-area {
        padding: 2rem 1.5rem;
    }
    
    .slider-container {
        margin-bottom: 1.5rem;
    }
    
    .card-header h5 {
        font-size: 1.1rem;
    }
    
    .card-body h6 {
        font-size: 0.95rem;
    }
    
    .media-player {
        padding: 10px;
        gap: 10px;
    }
    
    .play-pause-btn {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
    
    .time-display {
        font-size: 11px;
        min-width: 70px;
    }
    
    #waveform {
        min-height: 100px;
        padding: 0.75rem;
    }
}

/* Mobile Phone (< 768px) */
@media (max-width: 768px) {
    /* Upload Area */
    .upload-area {
        padding: 1.5rem 1rem;
        border-radius: 8px;
    }
    
    .upload-content {
        font-size: 0.9rem;
    }
    
    .upload-content i {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    /* Cards */
    .card {
        margin-bottom: 1rem;
        border-radius: 8px;
    }
    
    .card-header {
        padding: 0.75rem 1rem;
    }
    
    .card-header h5 {
        font-size: 1rem;
        margin: 0;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .card-body h6 {
        font-size: 0.9rem;
        margin-bottom: 0.75rem;
    }
    
    /* Form Labels */
    .form-label {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }
    
    /* Buttons */
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
        min-height: 44px; /* Better touch target */
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    .btn-sm {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
        min-height: 36px;
    }
    
    .btn-lg {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        min-height: 48px;
    }
    
    /* Sliders */
    .slider-container {
        margin-bottom: 1.5rem;
        padding: 1rem 0.75rem;
    }
    
    .slider-container .form-range {
        height: 10px; /* Bigger on mobile for easier interaction */
    }
    
    .slider-container .form-range::-webkit-slider-thumb,
    .slider-container .form-range::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }
    
    .slider-value {
        position: static;
        display: block;
        margin-top: 0.75rem;
        transform: none;
        font-size: 0.9rem;
        text-align: center;
        width: 100%;
    }
    
    /* Slider value displays (pitchValue, tempoValue) */
    #pitchValue,
    #tempoValue {
        font-size: 1rem !important;
    }
    
    .slider-container .fs-5 {
        font-size: 1rem !important;
    }
    
    /* Media Player */
    .media-player {
        padding: 10px;
        gap: 8px;
        border-radius: 6px;
        flex-wrap: nowrap;
    }
    
    .play-pause-btn {
        width: 44px;
        height: 44px;
        font-size: 18px;
        flex-shrink: 0;
    }
    
    .progress-container {
        min-height: 8px;
        cursor: pointer;
        -webkit-tap-highlight-color: transparent;
    }
    
    .progress-bar {
        height: 100%;
        min-height: 6px;
    }
    
    .time-display {
        font-size: 10px;
        min-width: 60px;
        white-space: nowrap;
    }
    
    /* Forms */
    .form-select,
    .form-control {
        padding: 0.625rem 0.75rem;
        font-size: 0.9rem;
        min-height: 44px; /* Better touch target */
    }
    
    .form-check {
        margin-bottom: 0.75rem;
    }
    
    .form-check-label {
        font-size: 0.9rem;
    }
    
    .form-check-input {
        width: 1.25rem;
        height: 1.25rem;
    }
    
    /* Row/Column Layouts */
    .row {
        margin-left: -0.5rem;
        margin-right: -0.5rem;
    }
    
    .row > [class*="col-"] {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
        margin-bottom: 1rem;
    }
    
    /* Vocal Range Cards */
    .card .row .col-md-6 {
        margin-bottom: 1rem;
    }
    
    /* Force columns to stack on mobile */
    .row .col-md-6 {
        width: 100%;
        max-width: 100%;
        flex: 0 0 100%;
    }
    
    /* Waveform */
    .waveform-container {
        padding: 0.25rem 0;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    #waveform {
        min-height: 80px;
        padding: 0.75rem 0.5rem;
        border-radius: 6px;
    }
    
    .waveform-card {
        margin-bottom: 1rem;
    }
    
    /* Badges */
    .badge {
        font-size: 0.7rem;
        padding: 0.375rem 0.625rem;
    }
    
    /* Toggle Buttons */
    .btn-sm {
        padding: 0.375rem 0.625rem;
        font-size: 0.8rem;
    }
    
    /* Audio Results */
    .card #originalAudioResults,
    .card #processedAudio {
        width: 100%;
        margin-bottom: 1rem;
    }
    
    /* File Upload */
    .filename-preview {
        max-width: 100%;
        font-size: 0.85rem;
        word-break: break-word;
        white-space: normal;
    }
    
    /* Spacing adjustments */
    .mb-4 {
        margin-bottom: 1.5rem !important;
    }
    
    .mb-3 {
        margin-bottom: 1rem !important;
    }
    
    .mt-3 {
        margin-top: 1rem !important;
    }
    
    .mt-4 {
        margin-top: 1.5rem !important;
    }
    
    .p-3 {
        padding: 1rem !important;
    }
    
    .p-4 {
        padding: 1.25rem !important;
    }
}

/* Small Mobile (< 480px) */
@media (max-width: 480px) {
    .upload-area {
        padding: 1rem 0.75rem;
    }
    
    .card-header {
        padding: 0.625rem 0.75rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .card-header .btn-sm {
        align-self: flex-end;
        margin-left: auto;
    }
    
    .card-body {
        padding: 0.75rem;
    }
    
    .media-player {
        padding: 8px;
        gap: 6px;
        flex-wrap: wrap;
    }
    
    .play-pause-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .time-display {
        font-size: 9px;
        min-width: 55px;
        order: 3;
        width: 100%;
        text-align: center;
        margin-top: 4px;
    }
    
    .progress-container {
        width: 100%;
        order: 2;
        margin-top: 4px;
    }
    
    .slider-container {
        padding: 0.875rem 0.5rem;
    }
    
    .card-header h5 {
        font-size: 0.95rem;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .btn:last-child {
        margin-bottom: 0;
    }
    
    .row > [class*="col-"] {
        width: 100%;
        margin-bottom: 0.75rem;
    }
    
    #waveform {
        min-height: 60px;
        padding: 0.5rem;
    }
    
    .form-select,
    .form-control {
        font-size: 0.85rem;
    }
    
    /* Slider value displays on small mobile */
    #pitchValue,
    #tempoValue {
        font-size: 0.9rem !important;
    }
    
    .slider-container .fs-5 {
        font-size: 0.9rem !important;
    }
}

/* Landscape Orientation (Mobile) */
@media (max-width: 768px) and (orientation: landscape) {
    .upload-area {
        padding: 1rem;
    }
    
    .card-body {
        padding: 0.875rem;
    }
    
    .media-player {
        padding: 8px;
    }
    
    #waveform {
        min-height: 60px;
    }
}

/* ======================
   🌞 Light Mode
   ====================== */
[data-theme="light"] {
    --dark-bg: #f8fafc;
    --dark-surface: #ffffff;
    --dark-border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
}

[data-theme="light"] .upload-area {
    background: var(--dark-surface);
    border-color: var(--dark-border);
}

/* ======================
   🧨 Animations
   ====================== */
.fade-in-up {
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in-right {
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ======================
   🎵 Waveform Range Indicators
   ====================== */

.waveform-container {
    position: relative;
}

.range-indicator {
    position: absolute;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, #10b981 20%, #10b981 80%, transparent 100%);
    z-index: 10;
    pointer-events: none;
    opacity: 1;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.8);
}

.range-indicator.lowest {
    background: linear-gradient(90deg, transparent 0%, #3b82f6 20%, #3b82f6 80%, transparent 100%);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.8);
}

.range-indicator.highest {
    background: linear-gradient(90deg, transparent 0%, #ef4444 20%, #ef4444 80%, transparent 100%);
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.8);
}

.range-indicator.center {
    background: linear-gradient(90deg, transparent 0%, #10b981 20%, #10b981 80%, transparent 100%);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.8);
}

.out-of-range-zone {
    position: absolute;
    left: 0;
    right: 0;
    background: rgba(239, 68, 68, 0.3);
    border: 2px solid rgba(239, 68, 68, 0.6);
    z-index: 5;
    pointer-events: none;
    box-shadow: inset 0 0 10px rgba(239, 68, 68, 0.4);
}

.out-of-range-zone.below-range {
    top: 0;
    height: 30%;
}

.out-of-range-zone.above-range {
    bottom: 0;
    height: 30%;
}

.range-label {
    position: absolute;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: bold;
    z-index: 15;
    pointer-events: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-shadow: 0 0 4px rgba(0, 0, 0, 0.8);
}

.range-label.lowest {
    color: #60a5fa;
    background: rgba(59, 130, 246, 0.9);
    border-color: rgba(59, 130, 246, 0.5);
}

.range-label.highest {
    color: #fca5a5;
    background: rgba(239, 68, 68, 0.9);
    border-color: rgba(239, 68, 68, 0.5);
}

.range-label.center {
    color: #6ee7b7;
    background: rgba(16, 185, 129, 0.9);
    border-color: rgba(16, 185, 129, 0.5);
}

.transposition-preview {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background: rgba(16, 185, 129, 0.1);
    border: 2px dashed #10b981;
    z-index: 8;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.transposition-preview.active {
    opacity: 1;
}

.transposition-preview-label {
    position: absolute;
    top: 5px;
    right: 5px;
    background: #10b981;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: bold;
    z-index: 20;
}