/**
 * Singing Range Test - Complete Stylesheet
 * Version: 1.0.0
 * Professional vocal range testing interface
 */

/* ==========================================
   CSS VARIABLES
   ========================================== */

:root {
    /* Primary Colors */
    --srt-primary: #7c3aed;
    --srt-primary-dark: #6d28d9;
    --srt-primary-light: #a78bfa;
    --srt-secondary: #f97316;
    --srt-accent: #14b8a6;
    
    /* Status Colors */
    --srt-success: #10b981;
    --srt-error: #ef4444;
    --srt-warning: #f59e0b;
    --srt-info: #3b82f6;
    
    /* Neutral Colors */
    --srt-bg: #ffffff;
    --srt-bg-alt: #f9fafb;
    --srt-bg-dark: #f3f4f6;
    --srt-text: #111827;
    --srt-text-light: #6b7280;
    --srt-text-muted: #9ca3af;
    --srt-border: #e5e7eb;
    --srt-border-dark: #d1d5db;
    
    /* Register Colors */
    --srt-chest: #3b82f6;
    --srt-mixed: #8b5cf6;
    --srt-head: #ec4899;
    --srt-falsetto: #f59e0b;
    
    /* Shadows */
    --srt-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --srt-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --srt-shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --srt-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --srt-shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --srt-space-xs: 0.25rem;
    --srt-space-sm: 0.5rem;
    --srt-space-md: 1rem;
    --srt-space-lg: 1.5rem;
    --srt-space-xl: 2rem;
    --srt-space-2xl: 3rem;
    --srt-space-3xl: 4rem;
    
    /* Border Radius */
    --srt-radius-sm: 0.375rem;
    --srt-radius: 0.5rem;
    --srt-radius-md: 0.75rem;
    --srt-radius-lg: 1rem;
    --srt-radius-xl: 1.5rem;
    --srt-radius-full: 9999px;
    
    /* Transitions */
    --srt-transition-fast: 0.15s ease;
    --srt-transition: 0.3s ease;
    --srt-transition-slow: 0.5s ease;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --srt-bg: #0f172a;
        --srt-bg-alt: #1e293b;
        --srt-bg-dark: #334155;
        --srt-text: #f1f5f9;
        --srt-text-light: #cbd5e1;
        --srt-text-muted: #94a3b8;
        --srt-border: #334155;
        --srt-border-dark: #475569;
    }
}

/* ==========================================
   BASE STYLES
   ========================================== */

.srt-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--srt-space-xl) var(--srt-space-md);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--srt-text);
    line-height: 1.6;
}

.srt-container * {
    box-sizing: border-box;
}

.srt-section {
    margin-bottom: var(--srt-space-2xl);
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */

.srt-container h1 {
    font-size: 3rem;
    font-weight: 800;
    margin: 0 0 var(--srt-space-md) 0;
    line-height: 1.2;
}

.srt-container h2 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 var(--srt-space-lg) 0;
    line-height: 1.3;
}

.srt-container h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 var(--srt-space-md) 0;
    line-height: 1.4;
}

.srt-container h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--srt-space-sm) 0;
}

.srt-container p {
    margin: 0 0 var(--srt-space-md) 0;
}

/* ==========================================
   HERO SECTION
   ========================================== */

.srt-hero {
    text-align: center;
    margin-bottom: var(--srt-space-3xl);
    padding: var(--srt-space-2xl) 0;
}

.srt-hero h1 {
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--srt-space-md);
}

.srt-subtitle {
    font-size: 1.25rem;
    color: var(--srt-text-light);
    margin-bottom: var(--srt-space-xl);
    font-weight: 500;
}

.srt-trust-bar {
    display: flex;
    justify-content: center;
    gap: var(--srt-space-2xl);
    flex-wrap: wrap;
    margin-top: var(--srt-space-xl);
}

.srt-trust-item {
    display: flex;
    align-items: center;
    gap: var(--srt-space-sm);
    color: var(--srt-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.srt-trust-icon {
    font-size: 1.25rem;
}

/* ==========================================
   CARDS
   ========================================== */

.srt-card {
    background: var(--srt-bg);
    border: 1px solid var(--srt-border);
    border-radius: var(--srt-radius-xl);
    padding: var(--srt-space-xl);
    margin-bottom: var(--srt-space-xl);
    box-shadow: var(--srt-shadow-md);
    transition: all var(--srt-transition);
}

.srt-card:hover {
    box-shadow: var(--srt-shadow-lg);
}

.srt-card-desc {
    color: var(--srt-text-light);
    margin-bottom: var(--srt-space-lg);
    font-size: 1rem;
}

/* ==========================================
   MODE SELECTION
   ========================================== */

.srt-mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--srt-space-xl);
    margin-top: var(--srt-space-xl);
}

.srt-mode-card {
    position: relative;
    background: var(--srt-bg);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius-xl);
    padding: var(--srt-space-xl);
    transition: all var(--srt-transition);
    cursor: pointer;
    text-align: center;
}

.srt-mode-card:hover {
    border-color: var(--srt-primary);
    transform: translateY(-4px);
    box-shadow: var(--srt-shadow-lg);
}

.srt-mode-featured {
    border-color: var(--srt-primary);
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.05), rgba(249, 115, 22, 0.05));
}

.srt-featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    color: white;
    padding: var(--srt-space-xs) var(--srt-space-md);
    border-radius: var(--srt-radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.srt-mode-icon {
    font-size: 4rem;
    margin-bottom: var(--srt-space-md);
}

.srt-mode-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--srt-space-sm);
}

.srt-mode-duration {
    color: var(--srt-text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--srt-space-md);
}

.srt-mode-desc {
    color: var(--srt-text-light);
    margin-bottom: var(--srt-space-lg);
    line-height: 1.6;
}

.srt-mode-features {
    list-style: none;
    padding: 0;
    margin: var(--srt-space-lg) 0;
    text-align: left;
}

.srt-mode-features li {
    padding: var(--srt-space-sm) 0;
    color: var(--srt-text-light);
    font-size: 0.875rem;
}

/* ==========================================
   BUTTONS
   ========================================== */

.srt-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--srt-space-sm);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--srt-radius-md);
    cursor: pointer;
    transition: all var(--srt-transition-fast);
    font-family: inherit;
    text-decoration: none;
    white-space: nowrap;
}

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

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

.srt-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.srt-btn-primary {
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-primary-dark));
    color: white;
}

.srt-btn-primary:hover {
    background: linear-gradient(135deg, var(--srt-primary-dark), var(--srt-primary));
}

.srt-btn-featured {
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    color: white;
    box-shadow: var(--srt-shadow-lg);
}

.srt-btn-secondary {
    background: var(--srt-bg-alt);
    color: var(--srt-text);
    border: 2px solid var(--srt-border);
}

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

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

.srt-btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

.srt-btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ==========================================
   HEALTH CHECK
   ========================================== */

.srt-health-header {
    text-align: center;
    margin-bottom: var(--srt-space-xl);
}

.srt-health-header h2 {
    margin-bottom: var(--srt-space-sm);
}

.srt-health-header p {
    color: var(--srt-text-light);
}

.srt-health-checklist {
    max-width: 600px;
    margin: 0 auto var(--srt-space-xl);
}

.srt-health-item {
    background: var(--srt-bg-alt);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-lg);
    margin-bottom: var(--srt-space-md);
    transition: all var(--srt-transition);
}

.srt-health-item:hover {
    border-color: var(--srt-primary);
}

.srt-checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--srt-space-md);
    cursor: pointer;
}

.srt-health-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--srt-primary);
}

.srt-checkbox-text {
    flex: 1;
    font-size: 1rem;
    color: var(--srt-text);
}

.srt-health-warning {
    background: rgba(249, 115, 22, 0.1);
    border: 2px solid var(--srt-warning);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-lg);
    margin: var(--srt-space-xl) 0;
    display: flex;
    gap: var(--srt-space-md);
}

.srt-warning-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.srt-warning-content strong {
    display: block;
    margin-bottom: var(--srt-space-xs);
    color: var(--srt-warning);
}

.srt-health-actions {
    display: flex;
    gap: var(--srt-space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================
   WARMUP SECTION
   ========================================== */

.srt-warmup-header {
    text-align: center;
    margin-bottom: var(--srt-space-xl);
}

.srt-warmup-progress {
    max-width: 400px;
    margin: var(--srt-space-lg) auto 0;
}

.srt-warmup-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-full);
    overflow: hidden;
    margin-bottom: var(--srt-space-sm);
}

.srt-warmup-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--srt-primary), var(--srt-secondary));
    transition: width var(--srt-transition);
    border-radius: var(--srt-radius-full);
}

.srt-warmup-progress-text {
    text-align: center;
    color: var(--srt-text-muted);
    font-size: 0.875rem;
}

.srt-warmup-exercise {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-xl);
    padding: var(--srt-space-2xl);
}

.srt-exercise-icon {
    font-size: 5rem;
    margin-bottom: var(--srt-space-lg);
}

.srt-warmup-exercise h3 {
    font-size: 2rem;
    margin-bottom: var(--srt-space-md);
}

.srt-exercise-timer {
    margin: var(--srt-space-xl) 0;
}

.srt-timer {
    font-size: 3rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    color: var(--srt-primary);
}

.srt-warmup-instructions {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--srt-text-light);
    margin: var(--srt-space-lg) 0;
}

.srt-warmup-demo {
    margin: var(--srt-space-lg) 0;
}

.srt-warmup-actions {
    display: flex;
    gap: var(--srt-space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--srt-space-xl);
}

/* ==========================================
   TEST INTERFACE
   ========================================== */

.srt-test-progress {
    margin-bottom: var(--srt-space-2xl);
}

.srt-progress-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.srt-progress-steps::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--srt-border);
    z-index: 0;
}

.srt-progress-step {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.srt-step-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--srt-bg-alt);
    border: 2px solid var(--srt-border);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--srt-space-sm);
    font-weight: 700;
    transition: all var(--srt-transition);
}

.srt-step-label {
    font-size: 0.875rem;
    color: var(--srt-text-muted);
}

.srt-step-active .srt-step-circle {
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    color: white;
    border-color: var(--srt-primary);
    transform: scale(1.1);
}

.srt-step-complete .srt-step-circle {
    background: var(--srt-success);
    color: white;
    border-color: var(--srt-success);
}

.srt-register-info {
    text-align: center;
    margin-bottom: var(--srt-space-xl);
    padding: var(--srt-space-lg);
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.05), rgba(249, 115, 22, 0.05));
    border-radius: var(--srt-radius-lg);
}

.srt-register-info h3 {
    margin-bottom: var(--srt-space-sm);
}

.srt-register-info p {
    color: var(--srt-text-light);
    margin: 0;
}

/* ==========================================
   CURRENT NOTE DISPLAY
   ========================================== */

.srt-current-note {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(249, 115, 22, 0.05));
    border-radius: var(--srt-radius-xl);
    padding: var(--srt-space-2xl);
    margin-bottom: var(--srt-space-xl);
    text-align: center;
}

.srt-note-display {
    margin-bottom: var(--srt-space-lg);
}

.srt-note-name {
    font-size: 5rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    color: var(--srt-primary);
    line-height: 1;
    margin-bottom: var(--srt-space-sm);
}

.srt-note-freq {
    font-size: 1.5rem;
    color: var(--srt-text-light);
    font-family: 'Courier New', monospace;
}

.srt-register-indicator {
    display: inline-block;
    padding: var(--srt-space-sm) var(--srt-space-lg);
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-full);
    font-weight: 600;
    margin: var(--srt-space-md) 0;
    transition: all var(--srt-transition);
}

.srt-register-indicator.srt-register-chest {
    background: rgba(59, 130, 246, 0.2);
    color: var(--srt-chest);
}

.srt-register-indicator.srt-register-mixed {
    background: rgba(139, 92, 246, 0.2);
    color: var(--srt-mixed);
}

.srt-register-indicator.srt-register-head {
    background: rgba(236, 72, 153, 0.2);
    color: var(--srt-head);
}

.srt-register-indicator.srt-register-falsetto {
    background: rgba(245, 158, 11, 0.2);
    color: var(--srt-falsetto);
}

/* ==========================================
   PITCH METER
   ========================================== */

.srt-pitch-meter {
    max-width: 500px;
    margin: var(--srt-space-lg) auto 0;
}

.srt-pitch-track {
    position: relative;
    width: 100%;
    height: 50px;
    background: linear-gradient(90deg, 
        #ef4444 0%, 
        #f59e0b 35%, 
        #10b981 50%, 
        #f59e0b 65%, 
        #ef4444 100%
    );
    border-radius: var(--srt-radius-full);
    overflow: hidden;
}

.srt-pitch-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 28px;
    height: 28px;
    background: white;
    border: 4px solid var(--srt-success);
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.6);
    transition: left 0.1s ease, border-color 0.2s;
}

.srt-pitch-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--srt-space-sm);
    font-size: 0.875rem;
    color: var(--srt-text-muted);
}

/* ==========================================
   PIANO KEYBOARD
   ========================================== */

.srt-piano-container {
    overflow-x: auto;
    margin: var(--srt-space-xl) 0;
    padding: var(--srt-space-lg);
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-lg);
}

.srt-piano {
    display: flex;
    gap: 2px;
    min-width: max-content;
    padding: var(--srt-space-md);
}

.srt-octave {
    position: relative;
    display: flex;
}

.srt-key {
    cursor: pointer;
    transition: all var(--srt-transition-fast);
    user-select: none;
}

.srt-key-white {
    width: 40px;
    height: 160px;
    background: white;
    border: 2px solid #ccc;
    border-radius: 0 0 var(--srt-radius-sm) var(--srt-radius-sm);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: var(--srt-space-sm);
    position: relative;
    z-index: 1;
}

.srt-key-white:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
}

.srt-key-black {
    position: absolute;
    width: 28px;
    height: 100px;
    background: linear-gradient(180deg, #2d3748, #1a202c);
    border: 1px solid #000;
    border-radius: 0 0 var(--srt-radius-sm) var(--srt-radius-sm);
    z-index: 2;
}

.srt-key-black:hover {
    background: linear-gradient(180deg, #1a202c, #000);
}

/* Position black keys */
.srt-key-black[data-note*="C#"] { left: 27px; }
.srt-key-black[data-note*="D#"] { left: 69px; }
.srt-key-black[data-note*="F#"] { left: 153px; }
.srt-key-black[data-note*="G#"] { left: 195px; }
.srt-key-black[data-note*="A#"] { left: 237px; }

.srt-key-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--srt-text-muted);
}

.srt-key-active {
    background: var(--srt-success) !important;
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.5);
}

.srt-key-chest {
    background: rgba(59, 130, 246, 0.3) !important;
}

.srt-key-mixed {
    background: rgba(139, 92, 246, 0.3) !important;
}

.srt-key-head {
    background: rgba(236, 72, 153, 0.3) !important;
}

.srt-key-falsetto {
    background: rgba(245, 158, 11, 0.3) !important;
}

.srt-key-low {
    background: var(--srt-info) !important;
    color: white;
}

.srt-key-high {
    background: var(--srt-error) !important;
    color: white;
}

/* ==========================================
   STRAIN WARNING
   ========================================== */

.srt-strain-warning {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--srt-error);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-lg);
    margin: var(--srt-space-xl) 0;
    display: flex;
    gap: var(--srt-space-md);
    align-items: flex-start;
}

.srt-strain-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.srt-strain-content {
    flex: 1;
}

.srt-strain-content strong {
    display: block;
    color: var(--srt-error);
    margin-bottom: var(--srt-space-xs);
}

/* ==========================================
   RECORDED NOTES
   ========================================== */

.srt-recorded-notes {
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-xl);
    margin: var(--srt-space-xl) 0;
}

.srt-recorded-notes h4 {
    text-align: center;
    margin-bottom: var(--srt-space-lg);
}

.srt-recorded-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--srt-space-md);
    margin-bottom: var(--srt-space-lg);
}

.srt-recorded-item {
    text-align: center;
    padding: var(--srt-space-md);
    background: var(--srt-bg);
    border-radius: var(--srt-radius);
    border: 2px solid var(--srt-border);
}

.srt-recorded-label {
    font-size: 0.875rem;
    color: var(--srt-text-muted);
    margin-bottom: var(--srt-space-xs);
}

.srt-recorded-range {
    font-size: 1.125rem;
    font-weight: 600;
    font-family: 'Courier New', monospace;
    color: var(--srt-primary);
}

/* ==========================================
   TEST CONTROLS
   ========================================== */

.srt-test-controls {
    display: flex;
    gap: var(--srt-space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin: var(--srt-space-xl) 0;
}

.srt-quick-tips {
    margin-top: var(--srt-space-xl);
}

.srt-quick-tips details {
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-lg);
}

.srt-quick-tips summary {
    cursor: pointer;
    font-weight: 600;
    user-select: none;
}

.srt-quick-tips ul {
    margin-top: var(--srt-space-md);
    padding-left: var(--srt-space-lg);
}

.srt-quick-tips li {
    margin-bottom: var(--srt-space-sm);
    color: var(--srt-text-light);
}

/* ==========================================
   RESULTS SECTION
   ========================================== */

.srt-result-hero {
    text-align: center;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(249, 115, 22, 0.1));
    padding: var(--srt-space-2xl);
}

.srt-voice-badge {
    display: inline-block;
    padding: var(--srt-space-xl) var(--srt-space-2xl);
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    border-radius: var(--srt-radius-xl);
    margin-bottom: var(--srt-space-lg);
}

.srt-voice-type-name {
    font-size: 3rem;
    font-weight: 800;
    color: white;
    margin: 0;
}

.srt-voice-subtype {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: var(--srt-space-sm);
}

.srt-voice-description {
    font-size: 1.125rem;
    color: var(--srt-text-light);
    line-height: 1.6;
    max-width: 700px;
    margin: var(--srt-space-lg) auto;
}

.srt-voice-stats {
    display: flex;
    gap: var(--srt-space-2xl);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--srt-space-xl);
}

.srt-voice-stat {
    text-align: center;
}

.srt-stat-label {
    font-size: 0.875rem;
    color: var(--srt-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.srt-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--srt-primary);
    font-family: 'Courier New', monospace;
    margin-top: var(--srt-space-xs);
}

/* ==========================================
   VOCAL MAP
   ========================================== */

.srt-vocal-map {
    margin: var(--srt-space-xl) 0;
}

.srt-map-register {
    margin-bottom: var(--srt-space-lg);
}

.srt-map-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--srt-text-muted);
    margin-bottom: var(--srt-space-sm);
}

.srt-map-bar {
    height: 40px;
    border-radius: var(--srt-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    font-family: 'Courier New', monospace;
    transition: width var(--srt-transition);
}

.srt-map-chest {
    background: linear-gradient(90deg, var(--srt-chest), rgba(59, 130, 246, 0.7));
}

.srt-map-mixed {
    background: linear-gradient(90deg, var(--srt-mixed), rgba(139, 92, 246, 0.7));
}

.srt-map-head {
    background: linear-gradient(90deg, var(--srt-head), rgba(236, 72, 153, 0.7));
}

.srt-map-falsetto {
    background: linear-gradient(90deg, var(--srt-falsetto), rgba(245, 158, 11, 0.7));
}

.srt-map-legend {
    display: flex;
    gap: var(--srt-space-lg);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--srt-space-xl);
    font-size: 0.875rem;
}

.srt-legend-item {
    display: flex;
    align-items: center;
    gap: var(--srt-space-sm);
}

.srt-legend-color {
    width: 20px;
    height: 20px;
    border-radius: var(--srt-radius-sm);
}

.srt-legend-performance {
    background: linear-gradient(135deg, var(--srt-success), rgba(16, 185, 129, 0.7));
}

.srt-legend-passaggio {
    background: linear-gradient(135deg, var(--srt-warning), rgba(245, 158, 11, 0.7));
}

/* ==========================================
   STATS GRID
   ========================================== */

.srt-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--srt-space-lg);
}

.srt-stat-card {
    text-align: center;
    padding: var(--srt-space-xl);
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-lg);
    border: 2px solid var(--srt-border);
    transition: all var(--srt-transition);
}

.srt-stat-card:hover {
    border-color: var(--srt-primary);
    transform: translateY(-4px);
}

.srt-stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--srt-space-md);
}

.srt-stat-big {
    font-size: 2rem;
    font-weight: 700;
    color: var(--srt-primary);
    font-family: 'Courier New', monospace;
    margin: var(--srt-space-sm) 0;
}

.srt-stat-sub {
    font-size: 0.875rem;
    color: var(--srt-text-muted);
}

/* ==========================================
   TABS
   ========================================== */

.srt-tabs {
    display: flex;
    gap: var(--srt-space-sm);
    margin: var(--srt-space-xl) 0;
    border-bottom: 2px solid var(--srt-border);
    overflow-x: auto;
}

.srt-tab {
    padding: var(--srt-space-md) var(--srt-space-lg);
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--srt-text-muted);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--srt-transition);
    white-space: nowrap;
}

.srt-tab:hover {
    color: var(--srt-primary);
}

.srt-tab-active {
    color: var(--srt-primary);
    border-bottom-color: var(--srt-primary);
}

.srt-tab-panel {
    display: none;
}

.srt-tab-panel.srt-tab-active {
    display: block;
}

/* ==========================================
   SINGERS & SONGS CARDS
   ========================================== */

.srt-filter-bar {
    display: flex;
    gap: var(--srt-space-md);
    margin-bottom: var(--srt-space-xl);
    flex-wrap: wrap;
}

.srt-select {
    padding: var(--srt-space-sm) var(--srt-space-md);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius);
    background: var(--srt-bg);
    color: var(--srt-text);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--srt-transition);
}

.srt-select:hover,
.srt-select:focus {
    border-color: var(--srt-primary);
    outline: none;
}

.srt-singers-grid,
.srt-songs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--srt-space-lg);
}

.srt-singer-card,
.srt-song-card {
    background: var(--srt-bg-alt);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-lg);
    transition: all var(--srt-transition);
    position: relative;
}

.srt-singer-card:hover,
.srt-song-card:hover {
    border-color: var(--srt-primary);
    transform: translateY(-4px);
    box-shadow: var(--srt-shadow-md);
}

.srt-exact-badge,
.srt-similar-badge {
    position: absolute;
    top: var(--srt-space-sm);
    right: var(--srt-space-sm);
    padding: var(--srt-space-xs) var(--srt-space-sm);
    border-radius: var(--srt-radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.srt-exact-badge {
    background: var(--srt-success);
    color: white;
}

.srt-similar-badge {
    background: var(--srt-info);
    color: white;
}

.srt-singer-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--srt-space-md);
}

.srt-singer-name {
    font-size: 1.125rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--srt-space-sm);
}

.srt-singer-range {
    font-family: 'Courier New', monospace;
    color: var(--srt-primary);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--srt-space-sm);
}

.srt-singer-meta,
.srt-song-meta {
    display: flex;
    gap: var(--srt-space-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--srt-space-md);
}

.srt-singer-type,
.srt-singer-genre,
.srt-song-genre {
    font-size: 0.75rem;
    padding: var(--srt-space-xs) var(--srt-space-sm);
    background: var(--srt-bg);
    border-radius: var(--srt-radius-full);
    color: var(--srt-text-muted);
}

.srt-singer-octaves {
    text-align: center;
    margin-top: var(--srt-space-sm);
    font-size: 0.875rem;
    color: var(--srt-text-light);
}

.srt-singer-techniques {
    font-size: 0.75rem;
    color: var(--srt-text-muted);
    text-align: center;
    margin-top: var(--srt-space-sm);
}

.srt-song-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--srt-space-xs);
}

.srt-song-artist {
    color: var(--srt-text-light);
    margin-bottom: var(--srt-space-md);
}

.srt-song-range {
    font-family: 'Courier New', monospace;
    color: var(--srt-primary);
    font-weight: 600;
    font-size: 0.875rem;
}

.srt-song-difficulty {
    font-size: 0.75rem;
    padding: var(--srt-space-xs) var(--srt-space-sm);
    border-radius: var(--srt-radius-full);
    font-weight: 600;
    text-transform: uppercase;
}

.srt-diff-beginner {
    background: rgba(16, 185, 129, 0.2);
    color: var(--srt-success);
}

.srt-diff-intermediate {
    background: rgba(245, 158, 11, 0.2);
    color: var(--srt-warning);
}

.srt-diff-advanced,
.srt-diff-professional {
    background: rgba(239, 68, 68, 0.2);
    color: var(--srt-error);
}

.srt-song-techniques {
    display: flex;
    gap: var(--srt-space-xs);
    flex-wrap: wrap;
    margin-top: var(--srt-space-md);
}

.srt-technique-tag {
    font-size: 0.75rem;
    padding: var(--srt-space-xs) var(--srt-space-sm);
    background: rgba(124, 58, 237, 0.1);
    border-radius: var(--srt-radius-full);
    color: var(--srt-primary);
}

.srt-song-purpose {
    font-size: 0.875rem;
    color: var(--srt-text-muted);
    margin-top: var(--srt-space-sm);
}

.srt-no-results {
    text-align: center;
    padding: var(--srt-space-3xl);
    color: var(--srt-text-muted);
    font-size: 1.125rem;
}

/* ==========================================
   TRAINING PLAN
   ========================================== */

.srt-priorities-list {
    margin-bottom: var(--srt-space-xl);
}

.srt-priority-item {
    display: flex;
    gap: var(--srt-space-md);
    padding: var(--srt-space-lg);
    background: var(--srt-bg-alt);
    border-left: 4px solid var(--srt-info);
    border-radius: var(--srt-radius-lg);
    margin-bottom: var(--srt-space-md);
}

.srt-priority-high {
    border-left-color: var(--srt-error);
}

.srt-priority-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.srt-priority-content h4 {
    margin-bottom: var(--srt-space-xs);
}

.srt-priority-content p {
    margin: 0;
    color: var(--srt-text-light);
}

.srt-exercises-list {
    display: grid;
    gap: var(--srt-space-md);
}

.srt-exercise-card {
    background: var(--srt-bg-alt);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius-lg);
    padding: var(--srt-space-lg);
    transition: all var(--srt-transition);
}

.srt-exercise-card:hover {
    border-color: var(--srt-primary);
}

.srt-exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--srt-space-md);
}

.srt-exercise-header h4 {
    margin: 0;
}

.srt-exercise-description {
    color: var(--srt-text-light);
    margin-bottom: var(--srt-space-md);
}

.srt-exercise-meta {
    display: flex;
    gap: var(--srt-space-lg);
    font-size: 0.875rem;
    color: var(--srt-text-muted);
}

.srt-exercise-details {
    margin-top: var(--srt-space-md);
}

.srt-exercise-details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--srt-primary);
    user-select: none;
}

.srt-exercise-instructions {
    margin: var(--srt-space-md) 0;
    padding-left: var(--srt-space-xl);
}

.srt-exercise-instructions li {
    margin-bottom: var(--srt-space-sm);
    color: var(--srt-text-light);
}

.srt-exercise-benefits {
    margin-top: var(--srt-space-md);
}

.srt-exercise-benefits ul {
    margin-top: var(--srt-space-sm);
    padding-left: var(--srt-space-xl);
}

.srt-exercise-benefits li {
    margin-bottom: var(--srt-space-xs);
    color: var(--srt-text-light);
}

/* ==========================================
   PRACTICE TOOLS
   ========================================== */

.srt-practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--srt-space-xl);
}

.srt-practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--srt-space-lg);
}

.srt-practice-tool {
    text-align: center;
    padding: var(--srt-space-xl);
    background: var(--srt-bg-alt);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius-xl);
    transition: all var(--srt-transition);
    cursor: pointer;
}

.srt-practice-tool:hover {
    border-color: var(--srt-primary);
    transform: translateY(-4px);
    box-shadow: var(--srt-shadow-md);
}

.srt-tool-icon {
    font-size: 3rem;
    margin-bottom: var(--srt-space-md);
}

.srt-practice-tool h3 {
    margin-bottom: var(--srt-space-sm);
}

.srt-practice-tool p {
    color: var(--srt-text-light);
    margin-bottom: var(--srt-space-lg);
}

.srt-tool-launch {
    margin-top: var(--srt-space-md);
}

.srt-practice-active {
    background: var(--srt-bg-alt);
    border-radius: var(--srt-radius-xl);
    padding: var(--srt-space-2xl);
    margin-top: var(--srt-space-xl);
}

/* ==========================================
   RESULT ACTIONS
   ========================================== */

.srt-result-actions {
    display: flex;
    gap: var(--srt-space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--srt-space-2xl);
}

/* ==========================================
   SHARE MODAL
   ========================================== */

.srt-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: var(--srt-space-md);
    backdrop-filter: blur(4px);
}

.srt-modal-content {
    background: var(--srt-bg);
    border-radius: var(--srt-radius-xl);
    max-width: 500px;
    width: 100%;
    padding: var(--srt-space-2xl);
    position: relative;
    box-shadow: var(--srt-shadow-xl);
    max-height: 90vh;
    overflow-y: auto;
}

.srt-modal-close {
    position: absolute;
    top: var(--srt-space-md);
    right: var(--srt-space-md);
    width: 36px;
    height: 36px;
    border: none;
    background: var(--srt-bg-alt);
    color: var(--srt-text);
    font-size: 1.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--srt-transition);
}

.srt-modal-close:hover {
    background: var(--srt-error);
    color: white;
}

.srt-modal-content h3 {
    margin-bottom: var(--srt-space-lg);
}

.srt-share-preview {
    margin: var(--srt-space-lg) 0;
}

.srt-share-card {
    background: linear-gradient(135deg, var(--srt-primary), var(--srt-secondary));
    color: white;
    padding: var(--srt-space-2xl);
    border-radius: var(--srt-radius-lg);
    text-align: center;
}

.srt-share-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--srt-space-lg);
    font-size: 0.875rem;
    opacity: 0.9;
}

.srt-share-header h4 {
    margin: 0;
    font-size: 1.125rem;
}

.srt-share-voice {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: var(--srt-space-sm);
}

.srt-share-range {
    font-size: 1.5rem;
    font-family: 'Courier New', monospace;
    margin-bottom: var(--srt-space-sm);
}

.srt-share-octaves {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--srt-space-md);
}

.srt-share-registers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--srt-space-sm);
    font-size: 0.875rem;
    opacity: 0.8;
}

.srt-share-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--srt-space-sm);
}

.srt-share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--srt-space-sm);
    padding: var(--srt-space-md);
    background: var(--srt-bg-alt);
    border: 2px solid var(--srt-border);
    border-radius: var(--srt-radius);
    cursor: pointer;
    font-weight: 600;
    color: var(--srt-text);
    transition: all var(--srt-transition);
}

.srt-share-btn:hover {
    border-color: var(--srt-primary);
    transform: translateY(-2px);
}

.srt-share-btn svg {
    width: 20px;
    height: 20px;
}

/* ==========================================
   TOAST NOTIFICATIONS
   ========================================== */

.srt-toast-container {
    position: fixed;
    top: var(--srt-space-md);
    right: var(--srt-space-md);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--srt-space-sm);
    max-width: 400px;
}

.srt-toast {
    display: flex;
    align-items: center;
    gap: var(--srt-space-md);
    padding: var(--srt-space-md) var(--srt-space-lg);
    background: white;
    border-radius: var(--srt-radius-lg);
    box-shadow: var(--srt-shadow-lg);
    border-left: 4px solid;
    opacity: 0;
    transform: translateX(100%);
    transition: all var(--srt-transition);
}

.srt-toast.srt-toast-show {
    opacity: 1;
    transform: translateX(0);
}

.srt-toast-success {
    border-left-color: var(--srt-success);
}

.srt-toast-error {
    border-left-color: var(--srt-error);
}

.srt-toast-info {
    border-left-color: var(--srt-info);
}

.srt-toast-warning {
    border-left-color: var(--srt-warning);
}

.srt-toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.srt-toast-message {
    flex: 1;
    font-size: 0.875rem;
    font-weight: 500;
}

/* ==========================================
   LOADING STATE
   ========================================== */

.srt-loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(4px);
}

.srt-loading-spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: srt-spin 0.8s linear infinite;
}

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

.srt-loading-text {
    color: white;
    margin-top: var(--srt-space-lg);
    font-size: 1.125rem;
    font-weight: 600;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

@media (max-width: 768px) {
    .srt-container {
        padding: var(--srt-space-lg) var(--srt-space-md);
    }
    
    .srt-hero h1 {
        font-size: 2rem;
    }
    
    .srt-subtitle {
        font-size: 1rem;
    }
    
    .srt-trust-bar {
        gap: var(--srt-space-lg);
    }
    
    .srt-mode-grid {
        grid-template-columns: 1fr;
    }
    
    .srt-card {
        padding: var(--srt-space-lg);
    }
    
    .srt-note-name {
        font-size: 3.5rem;
    }
    
    .srt-piano-container {
        padding: var(--srt-space-sm);
    }
    
    .srt-key-white {
        width: 32px;
        height: 120px;
    }
    
    .srt-key-black {
        width: 22px;
        height: 75px;
    }
    
    .srt-test-controls {
        flex-direction: column;
    }
    
    .srt-test-controls .srt-btn {
        width: 100%;
    }
    
    .srt-singers-grid,
    .srt-songs-grid {
        grid-template-columns: 1fr;
    }
    
    .srt-stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .srt-tabs {
        font-size: 0.875rem;
    }
    
    .srt-tab {
        padding: var(--srt-space-sm) var(--srt-space-md);
    }
    
    .srt-voice-type-name {
        font-size: 2rem;
    }
    
    .srt-voice-subtype {
        font-size: 1.125rem;
    }
    
    .srt-toast-container {
        left: var(--srt-space-sm);
        right: var(--srt-space-sm);
        max-width: none;
    }
    
    .srt-progress-steps {
        font-size: 0.75rem;
    }
    
    .srt-step-circle {
        width: 32px;
        height: 32px;
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .srt-hero h1 {
        font-size: 1.75rem;
    }
    
    .srt-voice-stats {
        flex-direction: column;
        gap: var(--srt-space-md);
    }
    
    .srt-stats-grid {
        grid-template-columns: 1fr;
    }
    
    .srt-share-buttons {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

*:focus-visible {
    outline: 3px solid var(--srt-primary);
    outline-offset: 2px;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    .srt-card,
    .srt-mode-card,
    .srt-singer-card,
    .srt-song-card {
        border-width: 3px;
    }
}

/* ==========================================
   PRINT STYLES
   ========================================== */

@media print {
    .srt-btn,
    .srt-test-controls,
    .srt-share-btn,
    .srt-toast-container,
    .srt-loading {
        display: none !important;
    }
    
    .srt-card {
        break-inside: avoid;
    }
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

.srt-text-center {
    text-align: center;
}

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

.srt-mt-lg {
    margin-top: var(--srt-space-lg);
}

.srt-mb-lg {
    margin-bottom: var(--srt-space-lg);
}

.srt-hidden {
    display: none !important;
}

/* ==========================================
   END OF STYLESHEET
   ========================================== */

console.log('✅ Singing Range Test CSS loaded successfully');
console.log('✅ Singing Range Test CSS loaded successfully');