:root {
    --bg-primary: #E0E5EC;
    --bg-secondary: #FFFFFF;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --text-primary: #2C3E50;
    --text-secondary: #5D6D7E;
    --accent-primary: #3498DB;
    --accent-secondary: #A3B1C6;
    --shadow-light: #FFFFFF;
    --shadow-dark: #A3B1C6;
    --border-color: #D1D9E6;
    --success: #27AE60;
    --warning: #F39C12;
    --danger: #E74C3C;
    --nav-height: 70px;
    --header-height: 60px;
}

[data-theme="dark"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-glass: rgba(22, 33, 62, 0.7);
    --text-primary: #E0E5EC;
    --text-secondary: #A3B1C6;
    --accent-primary: #4A90E2;
    --accent-secondary: #6B7B8C;
    --shadow-light: #252a3f;
    --shadow-dark: #0f0f1e;
    --border-color: #2C3E50;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: var(--nav-height);
}

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.app-logo {
    height: 40px;
    width: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
}

.app-logo:hover {
    transform: scale(1.05);
}

.app-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin: 0;
}

.theme-toggle {
    background: var(--bg-secondary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
    transition: all 0.3s ease;
}

.theme-toggle:active {
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.theme-toggle i {
    color: var(--accent-primary);
    font-size: 1.2rem;
}

.app-main {
    flex: 1;
    margin-top: var(--header-height);
    padding: 1rem;
    padding-bottom: 2rem;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.content-section.active {
    display: block;
}

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

.section-header {
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--accent-primary);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.hero-section {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
    text-align: center;
}

.hero-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.hero-section p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.feature-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 12px 12px 24px var(--shadow-dark), -12px -12px 24px var(--shadow-light);
}

.feature-card:active {
    transform: translateY(0);
}

/* Ícones SVG */
.icon {
    fill: currentColor;
    transition: all 0.3s ease;
}

.icon:hover {
    transform: scale(1.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.stat-item {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.lesson-progress {
    margin-top: 1rem;
}

.lesson-progress span {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 10px;
    transition: width 0.3s ease;
    width: 0%;
}

.lesson-container {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
    margin-bottom: 2rem;
}

.lesson-content {
    min-height: 300px;
    margin-bottom: 2rem;
}

.lesson-content h3 {
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.lesson-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.lesson-content ul, .lesson-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.lesson-content li {
    margin-bottom: 0.5rem;
}

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.lessons-list {
    margin-top: 2rem;
}

.lessons-list h3 {
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

#lessonsListContainer {
    display: grid;
    gap: 1rem;
}

.lesson-list-item {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
}

.lesson-list-item:hover {
    transform: translateX(5px);
}

.lesson-list-item.completed {
    opacity: 0.7;
}

.lesson-list-item .lesson-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-right: 1rem;
}

.lesson-list-item .lesson-info {
    flex: 1;
}

.lesson-list-item .lesson-title {
    font-weight: 600;
    color: var(--text-primary);
}

.lesson-list-item .lesson-status {
    font-size: 1.5rem;
}

.btn {
    padding: 10px 5px 10px 5px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
}

.btn:active {
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

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

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

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

/* Afinador Simplificado */
.tuner-simple {
    max-width: 500px;
    margin: 0 auto;
    padding: 0 1rem;
}

.strings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.string-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: none;
    border-radius: 15px;
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
    transition: all 0.3s ease;
    text-align: center;
}

.string-card:hover {
    transform: translateY(-2px);
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.string-card:active {
    transform: scale(0.98);
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.string-color {
    width: 60px;
    height: 8px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.string-g { background: #E74C3C; }
.string-d { background: #F39C12; }
.string-a { background: #3498DB; }
.string-e { background: #9B59B6; }

.string-info h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.25rem 0;
}

.string-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

.tuner-actions {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 250px;
}

.volume-control i {
    color: var(--text-secondary);
    font-size: 1rem;
}

.volume-control input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-secondary);
    outline: none;
    -webkit-appearance: none;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.volume-control input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.exercises-container {
    display: grid;
    gap: 2rem;
}

.exercise-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.exercise-card h3 {
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.exercise-card > p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.metronome-controls, .timer-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bpm-display, .timer-display {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 15px;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

#bpmSlider {
    width: 100%;
    -webkit-appearance: none;
    height: 8px;
    border-radius: 5px;
    background: var(--bg-secondary);
    outline: none;
}

#bpmSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

#bpmSlider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.metronome-buttons, .timer-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.metronome-buttons .btn, .timer-buttons .btn {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.metronome-visual {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--bg-secondary);
    margin: 1rem auto 0;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
    transition: all 0.1s ease;
}

.metronome-visual.beat {
    background: var(--accent-primary);
    box-shadow: 0 0 20px var(--accent-primary);
    transform: scale(1.1);
}

.timer-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.preset-btn {
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
    transition: all 0.3s ease;
}

.preset-btn:active {
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.timer-custom {
    display: flex;
    gap: 0.5rem;
}

.timer-custom input {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.coordination-exercises {
    display: grid;
    gap: 1rem;
}

.exercise-item {
    background: var(--bg-secondary);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
}

.exercise-item h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.exercise-item p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.exercise-pattern {
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.posture-container {
    display: grid;
    gap: 2rem;
}

.posture-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.posture-icon {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 1rem;
}

.posture-card h3 {
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.posture-list {
    list-style: none;
    margin-left: 0;
}

.posture-list li {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    position: relative;
    padding-left: 2.5rem;
}

.posture-list li::before {
    content: '✓';
    position: absolute;
    left: 1rem;
    color: var(--success);
    font-weight: 700;
}

.posture-list.error-list li::before {
    content: '✗';
    color: var(--danger);
}

.posture-tip {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    border-left: 4px solid var(--accent-primary);
}

.posture-tip.warning {
    border-left-color: var(--warning);
}

.relaxation-exercises {
    display: grid;
    gap: 1rem;
}

.exercise-step {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 10px;
}

.exercise-step strong {
    display: block;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

/* Diagramas visuais para postura */
.posture-diagram {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 15px;
    position: relative;
}

.violin-diagram {
    position: relative;
    width: 200px;
    height: 80px;
    transform: rotate(-15deg);
}

.violin-body {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 60px;
    height: 40px;
    background: linear-gradient(45deg, #8B4513, #A0522D);
    border-radius: 30px 30px 10px 10px;
    box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
}

.violin-neck {
    position: absolute;
    top: 10px;
    left: 80px;
    width: 80px;
    height: 8px;
    background: linear-gradient(45deg, #654321, #8B4513);
    border-radius: 4px;
    box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.violin-strings {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.violin-strings .string {
    position: absolute;
    width: 1px;
    height: 100%;
    background: #C0C0C0;
    box-shadow: 0 0 2px rgba(192, 192, 192, 0.5);
}

.violin-strings .string-g { left: 25px; }
.violin-strings .string-d { left: 35px; }
.violin-strings .string-a { left: 45px; }
.violin-strings .string-e { left: 55px; }

.shoulder-rest {
    position: absolute;
    top: 35px;
    left: 15px;
    width: 70px;
    height: 8px;
    background: #2C3E50;
    border-radius: 4px;
    transform: rotate(15deg);
}

.chin-rest {
    position: absolute;
    top: 5px;
    left: 70px;
    width: 20px;
    height: 15px;
    background: #34495E;
    border-radius: 10px 10px 0 0;
    transform: rotate(15deg);
}

.angle-indicator {
    position: absolute;
    bottom: -10px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.angle-line {
    width: 30px;
    height: 2px;
    background: var(--accent-primary);
    transform: rotate(45deg);
    position: relative;
}

.angle-line::after {
    content: '';
    position: absolute;
    right: -5px;
    top: -3px;
    width: 0;
    height: 0;
    border-left: 6px solid var(--accent-primary);
    border-top: 3px solid transparent;
    border-bottom: 3px solid transparent;
}

.angle-text {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-primary);
}

/* Diagrama da mão esquerda */
.hand-diagram {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 15px;
}

.finger-diagram {
    position: relative;
    width: 120px;
    height: 80px;
}

.finger {
    position: absolute;
    width: 8px;
    height: 20px;
    background: linear-gradient(45deg, #FFB6C1, #FFA0B4);
    border-radius: 4px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.finger-1 { top: 10px; left: 30px; }
.finger-2 { top: 5px; left: 45px; }
.finger-3 { top: 0px; left: 60px; }
.finger-4 { top: -5px; left: 75px; }

.finger-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    font-weight: bold;
    color: var(--accent-primary);
}

.violin-neck-diagram {
    position: absolute;
    bottom: 0;
    left: 20px;
    width: 80px;
    height: 6px;
    background: linear-gradient(45deg, #654321, #8B4513);
    border-radius: 3px;
}

/* Diagrama do arco */
.bow-diagram {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 15px;
}

.bow-stick {
    position: relative;
    width: 150px;
    height: 4px;
    background: linear-gradient(45deg, #8B4513, #A0522D);
    border-radius: 2px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.bow-hair {
    position: absolute;
    top: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #F5F5DC;
    border-radius: 1px;
}

.bow-frog {
    position: absolute;
    left: 0;
    top: -8px;
    width: 20px;
    height: 20px;
    background: linear-gradient(45deg, #2C3E50, #34495E);
    border-radius: 10px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

.bow-tip {
    position: absolute;
    right: -5px;
    top: -3px;
    width: 0;
    height: 0;
    border-left: 8px solid #8B4513;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
}

/* Indicadores de posição dos dedos */
.finger-position {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 4px var(--accent-primary);
}

.finger-position-1 { top: 15px; left: 35px; }
.finger-position-2 { top: 10px; left: 50px; }
.finger-position-3 { top: 5px; left: 65px; }
.finger-position-4 { top: 0px; left: 80px; }

.practice-container {
    display: grid;
    gap: 2rem;
}

.practice-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.stat-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-card i {
    font-size: 2rem;
    color: var(--accent-primary);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.practice-checklist {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.checklist-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.checklist-header h3 {
    color: var(--accent-primary);
}

#checklistContainer {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
    transition: all 0.3s ease;
}

.checklist-item.completed {
    opacity: 0.6;
}

.checklist-item input[type="checkbox"] {
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--accent-primary);
}

.checklist-item label {
    flex: 1;
    cursor: pointer;
    user-select: none;
}

.checklist-item.completed label {
    text-decoration: line-through;
}

.checklist-item .delete-task {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.checklist-item .delete-task:hover {
    opacity: 1;
}

.add-task-form {
    display: flex;
    gap: 0.5rem;
}

.add-task-form input {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.practice-calendar {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.practice-calendar h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

#calendarGrid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--bg-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.calendar-day.header {
    background: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: default;
}

.calendar-day.other-month {
    opacity: 0.3;
}

.calendar-day.today {
    border: 2px solid var(--accent-primary);
}

.calendar-day.no-practice {
    background: var(--bg-secondary);
}

.calendar-day.light-practice {
    background: rgba(52, 152, 219, 0.3);
}

.calendar-day.medium-practice {
    background: rgba(52, 152, 219, 0.6);
}

.calendar-day.heavy-practice {
    background: rgba(52, 152, 219, 0.9);
    color: white;
}

.calendar-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.practice-notes {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.practice-notes h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.practice-notes textarea {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
    margin-bottom: 1rem;
}

.notes-feedback {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 10px;
    text-align: center;
    font-weight: 600;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.notes-feedback.show {
    opacity: 1;
}

.notes-feedback.success {
    background: var(--success);
    color: white;
}

.faq-container {
    display: grid;
    gap: 1rem;
}

.faq-item {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    color: var(--accent-primary);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--accent-primary);
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-answer:not([hidden]) {
    padding: 0 1.5rem 1.5rem;
    max-height: 1000px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.faq-answer ul {
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

.faq-answer li {
    margin-bottom: 0.5rem;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0 0.5rem;
    z-index: 100;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 12px;
    min-width: 60px;
}

.nav-item i {
    font-size: 1.5rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 600;
}

.nav-item.active {
    color: var(--accent-primary);
    background: var(--bg-secondary);
    box-shadow: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
}

.app-footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 2rem;
}

@media (max-width: 480px) {
    .app-main {
        padding: 0.5rem;
    }
    
    .hero-section {
        padding: 1rem;
    }
    
    .app-logo {
        height: 35px;
    }
    
    .header-logo {
        gap: 0.75rem;
    }
    
    .app-header h1 {
        font-size: 1.2rem;
    }
    
    .feature-card {
        padding: 1rem;
    }
    
    .lesson-container, .exercise-card, .posture-card {
        padding: 1rem;
    }
    
    .timer-presets {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .practice-stats {
        grid-template-columns: 1fr;
    }
}

/* Tablet Portrait - 768px a 1024px */
@media (min-width: 768px) and (max-width: 1024px) {
    .app-container {
        padding: 0 1rem;
    }
    
    .app-header h1 {
        font-size: 1.8rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        font-size: 2.5rem;
    }
    
    .lesson-container {
        padding: 1.5rem;
    }
    
    .tuner-simple {
        max-width: 600px;
    }
    
    .strings-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .string-card {
        padding: 2rem;
    }
    
    .practice-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .calendar-grid {
        grid-template-columns: repeat(7, 1fr);
        gap: 0.5rem;
    }
    
    .bottom-nav {
        padding: 0.75rem 1rem;
    }
    
    .nav-item {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
    
    .exercises-container {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
    
    .posture-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop - 1024px+ */
@media (min-width: 1024px) {
    .app-container {
        max-width: 1200px;
        margin: 0 auto;
    }
    
    .app-header h1 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
    
    .exercises-container {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
    
    .exercises-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
        max-width: 800px;
        margin: 1rem auto 0;
    }
    
    .exercise-item-card {
        max-width: 380px;
        min-height: 220px;
    }
    
    .posture-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Telas muito grandes - 1440px+ */
@media (min-width: 1440px) {
    .exercises-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
        max-width: 900px;
        margin: 1rem auto 0;
    }
    
    .exercise-item-card {
        max-width: 420px;
        min-height: 240px;
        padding: 2rem;
    }
    
    .exercise-title {
        font-size: 1.3rem;
    }
    
    .exercise-description {
        font-size: 1rem;
    }
}

@media (min-width: 1024px) {
    .app-main {
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

/* Screen reader only class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Melhorias de UX - Animações e Feedback */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

@keyframes glow {
    0% { box-shadow: 0 0 5px var(--accent-primary); }
    50% { box-shadow: 0 0 20px var(--accent-primary), 0 0 30px var(--accent-primary); }
    100% { box-shadow: 0 0 5px var(--accent-primary); }
}

/* Feedback visual para interações */
.btn:active {
    animation: pulse 0.2s ease;
}

.feature-card:hover {
    animation: slideIn 0.3s ease;
}

/* Indicadores de progresso melhorados */
.progress-indicator {
    position: relative;
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    margin: 0 5px;
    transition: all 0.3s ease;
}

.progress-indicator.completed {
    background: var(--success);
    animation: bounce 0.6s ease;
}

.progress-indicator.current {
    animation: glow 2s infinite;
}

/* Tooltips */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--text-primary);
    color: var(--bg-primary);
    text-align: center;
    border-radius: 6px;
    padding: 8px;
    position: absolute;
    z-index: 1000;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.85rem;
}

.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--text-primary) transparent transparent transparent;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* Notificações de feedback */
.notification {
    position: fixed;
    top: 80px;
    right: 20px;
    background: var(--success);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

.notification.show {
    transform: translateX(0);
}

.notification.error {
    background: var(--danger);
}

.notification.warning {
    background: var(--warning);
}

/* Loading states */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 1.5s infinite;
}

/* Melhorias de acessibilidade */
.focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Estados de hover melhorados */
.interactive:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

/* Indicadores de status */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.status-indicator.success {
    background: rgba(39, 174, 96, 0.1);
    color: var(--success);
}

.status-indicator.warning {
    background: rgba(243, 156, 18, 0.1);
    color: var(--warning);
}

.status-indicator.info {
    background: rgba(52, 152, 219, 0.1);
    color: var(--accent-primary);
}

/* Estilos para a nova seção de exercícios */
.exercise-progress {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-glass);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.progress-stats {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.exercise-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-glass);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    justify-content: center;
    align-items: center;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 150px;
    flex: 1;
    max-width: 200px;
}

.filter-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.filter-group select {
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

.exercises-library {
    margin-bottom: 2rem;
}

.exercises-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 1rem;
    justify-items: center;
}

.exercise-item-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 100%;
    max-width: 100%;
}

.exercise-item-card:hover {
    transform: translateY(-5px);
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.exercise-item-card.completed {
    opacity: 0.8;
    border-left: 4px solid var(--success);
}

.exercise-item-card.completed::before {
    content: "✓";
    position: absolute;
    top: 1rem;
    right: 1rem;
    color: var(--success);
    font-size: 1.5rem;
    font-weight: bold;
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.exercise-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.exercise-meta {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.difficulty-badge, .duration-badge, .category-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.difficulty-badge {
    background: rgba(52, 152, 219, 0.2);
    color: var(--accent-primary);
}

.difficulty-badge.intermediate {
    background: rgba(243, 156, 18, 0.2);
    color: var(--warning);
}

.difficulty-badge.advanced {
    background: rgba(231, 76, 60, 0.2);
    color: var(--danger);
}

.duration-badge {
    background: rgba(155, 89, 182, 0.2);
    color: #9B59B6;
}

.category-badge {
    background: rgba(39, 174, 96, 0.2);
    color: var(--success);
}

.exercise-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.exercise-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.practice-tools {
    margin-top: 2rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 20px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.exercise-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.exercise-instructions ol {
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

.exercise-instructions li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.pattern-display {
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.modal-footer {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Responsividade para exercícios */
/* Tablet - 768px a 1024px */
@media (min-width: 768px) and (max-width: 1024px) {
    .exercise-filters {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.5rem;
    }
    
    .filter-group {
        min-width: 200px;
        flex: 1;
        max-width: 250px;
    }
    
    .exercises-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .exercise-item-card {
        min-height: 200px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .exercise-card {
        padding: 1.5rem;
        min-height: 300px;
    }
    
    .metronome-controls,
    .timer-controls {
        padding: 1.5rem;
    }
    
    .timer-presets {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.75rem;
    }
    
    .timer-buttons {
        flex-direction: row;
        justify-content: center;
        gap: 0.75rem;
        flex-wrap: nowrap;
    }
    
    .timer-buttons .btn {
        flex: 1;
        min-width: 80px;
        max-width: 120px;
        font-size: 0.9rem;
        padding: 0.75rem 0.5rem;
    }
    
    .bpm-display {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .timer-display {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
}

/* Telas médias - 769px a 1023px */
@media (min-width: 769px) and (max-width: 1023px) {
    .timer-buttons {
        flex-direction: row;
        gap: 0.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .timer-buttons .btn {
        flex: 1;
        min-width: 70px;
        max-width: 100px;
        font-size: 0.85rem;
        padding: 0.6rem 0.4rem;
    }
    
    .timer-buttons .btn svg {
        width: 14px;
        height: 14px;
    }
}

/* Mobile - até 768px */
@media (max-width: 768px) {
    .exercise-filters {
        flex-direction: column;
        gap: 1rem;
    }
    
    .filter-group {
        min-width: auto;
        max-width: none;
    }
    
    .exercises-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .exercise-item-card {
        min-height: auto;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .timer-presets {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .timer-buttons {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }
    
    .timer-buttons .btn {
        width: 100%;
        min-width: auto;
        max-width: none;
        font-size: 0.9rem;
        padding: 0.75rem 1rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .exercise-card {
        padding: 1rem;
        min-height: 250px;
    }
    
    .metronome-controls,
    .timer-controls {
        padding: 1rem;
    }
    
    .bpm-display {
        font-size: 1.2rem;
    }
    
    .timer-display {
        font-size: 1.5rem;
    }
    
    .timer-presets {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
}

/* Telas muito pequenas - até 480px */
@media (max-width: 480px) {
    .timer-buttons {
        flex-direction: column;
        gap: 0.4rem;
        width: 100%;
    }
    
    .timer-buttons .btn {
        width: 100%;
        font-size: 0.85rem;
        padding: 0.6rem 0.8rem;
        min-width: auto;
        max-width: none;
    }
    
    .timer-buttons .btn svg {
        width: 14px;
        height: 14px;
    }
    
    .timer-controls {
        padding: 0.8rem;
    }
    
    .timer-display {
        font-size: 1.3rem;
    }
    
    .modal-footer {
        flex-direction: column;
    }
}

/* Estilos para FAQ e Privacy */
.faq-container, .privacy-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.faq-item {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 8px 8px 16px var(--shadow-dark), -8px -8px 16px var(--shadow-light);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--accent-primary);
    color: white;
}

.faq-question h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.faq-question:hover h3 {
    color: white;
}

.faq-icon {
    transition: transform 0.3s ease;
    color: var(--accent-primary);
}

.faq-question:hover .faq-icon {
    color: white;
}

.faq-answer {
    padding: 0 1.5rem;
    display: none;
    background: var(--bg-primary);
}

.faq-answer p {
    margin: 1rem 0;
    line-height: 1.6;
    color: var(--text-secondary);
}

.faq-answer ul, .faq-answer ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.faq-answer li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.faq-answer strong {
    color: var(--text-primary);
    font-weight: 600;
}

.faq-item.active .faq-answer {
    display: block;
    padding: 1.5rem;
}

.privacy-section {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
}

.privacy-section h3 {
    color: var(--accent-primary);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 0.5rem;
}

.privacy-section h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin: 1.5rem 0 0.5rem 0;
}

.privacy-section p {
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.privacy-section ul, .privacy-section ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.privacy-section li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.privacy-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

.contact-section {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
    box-shadow: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
}

.contact-section h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.contact-section p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.contact-info {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 1rem 0;
    text-align: left;
}

.contact-info p {
    margin: 0.5rem 0;
    color: var(--text-primary);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* Responsividade para FAQ e Privacy */
@media (max-width: 768px) {
    .faq-container, .privacy-container {
        padding: 0 0.5rem;
    }
    
    .faq-question {
        padding: 1rem;
    }
    
    .faq-question h3 {
        font-size: 1rem;
    }
    
    .faq-item.active .faq-answer {
        padding: 1rem;
    }
    
    .privacy-section {
        padding: 1.5rem;
    }
    
    .privacy-section h3 {
        font-size: 1.2rem;
    }
    
    .contact-section {
        padding: 1.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .action-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

/* Responsividade para o afinador simplificado */
@media (max-width: 768px) {
    .tuner-simple {
        padding: 0 0.5rem;
    }
    
    .strings-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .string-card {
        padding: 1rem;
    }
    
    .string-color {
        width: 50px;
        height: 6px;
    }
    
    .string-info h3 {
        font-size: 1.1rem;
    }
    
    .string-info p {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .tuner-simple {
        padding: 0 0.25rem;
    }
    
    .string-card {
        padding: 0.75rem;
    }
    
    .string-color {
        width: 40px;
        height: 5px;
    }
    
    .string-info h3 {
        font-size: 1rem;
    }
    
    .string-info p {
        font-size: 0.75rem;
    }
    
    .tuner-actions {
        padding: 1rem;
    }
}