/* ===== VARIABLES CSS ===== */
:root {
    /* Colores principales */
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #FF9800;
    --success-color: #4CAF50;
    --warning-color: #FF5722;
    --error-color: #F44336;
    
    /* Colores de fondo */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    
    /* Colores de texto */
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.25rem;
    
    /* Bordes */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.2);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.3);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== RESET Y BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== CONTAINER PRINCIPAL ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER ===== */
.app-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ===== NAVEGACIÓN DE TESTS ===== */
.test-navigation {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--bg-tertiary);
}

.test-navigation h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
    font-weight: 600;
}

.test-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-sm);
}

.test-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    min-height: 36px;
}

.test-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.test-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.test-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ===== PANEL DE CONTROL ===== */
.control-panel {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.main-controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.settings-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--bg-tertiary);
}

.setting-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.setting-item label {
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ===== BOTONES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    min-width: 120px;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--text-muted);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--text-muted);
}

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

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

/* ===== CONTROLES DE ENTRADA ===== */
input[type="range"] {
    flex: 1;
    appearance: none;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--text-muted);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

/* ===== SECCIÓN DE ESTADO ===== */
.status-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: center;
}

.status-light {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: all var(--transition-normal);
}

.status-light.ready {
    background: var(--success-color);
    box-shadow: 0 0 10px var(--success-color);
}

.status-light.recording {
    background: var(--error-color);
    box-shadow: 0 0 10px var(--error-color);
    animation: pulse 1s infinite;
}

.status-light.error {
    background: var(--warning-color);
    box-shadow: 0 0 10px var(--warning-color);
}

.mic-permission {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--warning-color);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
}

/* ===== ÁREA DE VISUALIZACIÓN ===== */
.visualization-area {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.meter-section,
.notes-section,
.precision-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

.meter-section h2,
.notes-section h2,
.precision-section h3 {
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* ===== MEDIDOR DE TONO ===== */
.pitch-meter-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.meter-display {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    justify-content: center;
}

.frequency-display,
.note-display {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    min-width: 80px;
}

.frequency-display span,
.note-display span {
    display: block;
    font-size: 1.4rem;
    font-weight: bold;
}

.frequency-display::before {
    content: "Frecuencia";
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.note-display::before {
    content: "Nota";
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* ===== PANEL DE NOTAS ===== */
.notes-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.note-item {
    text-align: center;
    transition: all var(--transition-normal);
}

.note-button {
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-sm);
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

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

.note-item.active .note-button {
    background: var(--success-color);
    border-color: var(--success-color);
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.5);
}

.note-item.close .note-button {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
}

.note-item.far .note-button {
    background: var(--error-color);
    border-color: var(--error-color);
}

.note-item.exact .note-button {
    background: var(--success-color);
    border-color: var(--success-color);
    transform: scale(1.15);
    box-shadow: 0 0 30px rgba(76, 175, 80, 0.8);
    animation: pulseGlow 2s infinite alternate;
}

@keyframes pulseGlow {
    0% {
        box-shadow: 0 0 30px rgba(76, 175, 80, 0.8);
    }
    100% {
        box-shadow: 0 0 40px rgba(76, 175, 80, 1);
    }
}

/* ===== MEDIDOR DE PRECISIÓN ===== */
.precision-meter {
    max-width: 400px;
    margin: 0 auto;
}

.precision-bar {
    height: 20px;
    background: linear-gradient(90deg, var(--error-color) 0%, var(--secondary-color) 50%, var(--success-color) 100%);
    border-radius: 10px;
    position: relative;
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.precision-indicator {
    position: absolute;
    top: -5px;
    width: 30px;
    height: 30px;
    background: white;
    border: 3px solid var(--text-primary);
    border-radius: 50%;
    transform: translateX(-50%);
    transition: left var(--transition-fast);
    left: 50%;
}

.precision-indicator.glowing {
    background: var(--success-color);
    border-color: var(--success-color);
    box-shadow: 0 0 15px var(--success-color);
    animation: glow 1.5s infinite alternate;
}

@keyframes glow {
    0% {
        box-shadow: 0 0 15px var(--success-color);
    }
    100% {
        box-shadow: 0 0 25px var(--success-color), 0 0 35px rgba(76, 175, 80, 0.5);
    }
}

.precision-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== MENSAJES DE ERROR ===== */
.error-display {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.error-content {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.error-content h3 {
    color: var(--error-color);
    margin-bottom: var(--spacing-md);
}

/* ===== FOOTER ===== */
.app-footer {
    text-align: center;
    padding: var(--spacing-md);
    margin-top: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--bg-tertiary);
}

/* ===== ANIMACIONES ===== */
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .app-header h1 {
        font-size: 2rem;
    }
    
    .test-links {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
    }
    
    .test-link {
        font-size: 0.8rem;
        padding: var(--spacing-xs);
        min-height: 32px;
    }
    
    .main-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .meter-display {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .notes-panel {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .setting-item {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }
    
    .settings-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .app-header h1 {
        font-size: 1.8rem;
    }
    
    .test-links {
        grid-template-columns: 1fr;
    }
    
    .test-navigation h4 {
        font-size: 0.9rem;
    }
    
    .frequency-display span,
    .note-display span {
        font-size: 1.2rem;
    }
    
    .notes-panel {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===== UTILIDADES ===== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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