:root {
    --primary-blue: #2196F3;
    --success-green: #4CAF50;
    --warning-yellow: #FFC107;
    --error-red: #F44336;
    --accent-purple: #9C27B0;
    
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-accent: #f5f5f5;
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #ffffff;
    
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 16px rgba(0,0,0,0.2);
    
    --border-radius: 12px;
    --border-radius-small: 8px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-accent) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    padding-bottom: 80px;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(33, 150, 243, 0.05) 1px, transparent 0);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: -1;
}

.app-header {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header h1 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    font-weight: 600;
}

.header-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.header-btn {
    background: none;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-small);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.header-btn:hover {
    background: var(--bg-accent);
    color: var(--primary-blue);
}

.app-main {
    padding: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

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

.section.active {
    display: block;
}

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

/* Home Section Styles */
.welcome-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.welcome-card h2 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.welcome-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.quick-stats {
    display: flex;
    justify-content: space-around;
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--success-green);
}

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

.recent-practice {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.recent-practice h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.recent-chords-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.recent-chord-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--bg-accent);
    border-radius: var(--border-radius-small);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: var(--spacing-lg);
}

/* Chords Section Styles */
.chord-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.chord-categories {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
}

.category-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--bg-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    font-weight: 500;
}

.category-btn.active,
.category-btn:hover {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: var(--text-light);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box input {
    width: 100%;
    padding: var(--spacing-md);
    padding-right: 40px;
    border: 2px solid var(--bg-accent);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.search-box i {
    position: absolute;
    right: var(--spacing-md);
    color: var(--text-secondary);
}

.chord-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.chord-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.chord-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-blue);
}

.chord-card.practiced {
    border-color: var(--success-green);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(76, 175, 80, 0.1) 100%);
}

.chord-card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.chord-preview {
    width: 100px;
    height: 120px;
    margin: 0 auto var(--spacing-sm);
    background: var(--bg-accent);
    border-radius: var(--border-radius-small);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.difficulty {
    display: flex;
    justify-content: center;
    gap: 2px;
}

.star {
    color: var(--warning-yellow);
    font-size: 0.8rem;
}

.star.empty {
    color: var(--bg-accent);
}

/* Chord Detail Styles */
.chord-detail {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-medium);
}

.chord-detail.hidden {
    display: none;
}

.chord-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.back-btn {
    background: var(--bg-accent);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-small);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.back-btn:hover {
    background: var(--primary-blue);
    color: var(--text-light);
}

.play-btn {
    background: var(--success-green);
    border: none;
    padding: var(--spacing-md);
    border-radius: 50%;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn:hover {
    transform: scale(1.1);
}

.chord-diagram-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

#chord-diagram {
    border: 2px solid var(--bg-accent);
    border-radius: var(--border-radius-small);
    background: var(--bg-secondary);
}

.chord-info {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.chord-info h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.chord-notes span {
    background: var(--primary-blue);
    color: var(--text-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    margin-right: var(--spacing-xs);
    font-weight: 500;
}

.stars {
    display: flex;
    gap: 2px;
}

.chord-tips p {
    background: var(--bg-accent);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-small);
    color: var(--text-secondary);
}

.practice-btn {
    width: 100%;
    background: var(--success-green);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.practice-btn:hover {
    background: #45a049;
    transform: translateY(-1px);
}

.practice-btn.practiced {
    background: var(--text-secondary);
    cursor: default;
}

.practice-btn.practiced:hover {
    transform: none;
}

/* Progressions Section Styles */
.progression-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.progression-header h2 {
    color: var(--text-primary);
}

.create-btn {
    background: var(--primary-blue);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.create-btn:hover {
    background: #1976D2;
    transform: translateY(-1px);
}

.progression-categories {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.prog-category-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--bg-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.prog-category-btn.active,
.prog-category-btn:hover {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
    color: var(--text-light);
}

.progressions-list {
    display: grid;
    gap: var(--spacing-md);
}

.progression-item {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.progression-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--accent-purple);
}

.progression-item h3 {
    color: var(--accent-purple);
    margin-bottom: var(--spacing-sm);
}

.progression-chords {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.progression-chord {
    background: var(--bg-accent);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    color: var(--text-primary);
    font-weight: 500;
}

.progression-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Progression Player Styles */
.progression-player {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-medium);
}

.progression-player.hidden {
    display: none;
}

.player-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.close-btn {
    background: var(--error-red);
    border: none;
    padding: var(--spacing-sm);
    border-radius: 50%;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: #d32f2f;
}

.progression-display {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.current-chord {
    margin-bottom: var(--spacing-lg);
}

#progression-diagram {
    border: 2px solid var(--bg-accent);
    border-radius: var(--border-radius-small);
    margin-bottom: var(--spacing-md);
}

.chord-sequence {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.sequence-chord {
    background: var(--bg-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-small);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.sequence-chord.active {
    background: var(--primary-blue);
    color: var(--text-light);
}

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

.control-btn {
    background: var(--bg-accent);
    border: none;
    padding: var(--spacing-md);
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: var(--primary-blue);
    color: var(--text-light);
}

.control-btn.play {
    background: var(--success-green);
    color: var(--text-light);
}

.control-btn.play:hover {
    background: #45a049;
}

.tempo-control {
    text-align: center;
}

.tempo-control label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

#tempo-slider {
    width: 100%;
    max-width: 300px;
}

/* Tuning Section Styles */
.tuning-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.tuning-mode {
    display: flex;
    gap: var(--spacing-sm);
}

.tune-mode-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--bg-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.tune-mode-btn.active,
.tune-mode-btn:hover {
    background: var(--warning-yellow);
    border-color: var(--warning-yellow);
    color: var(--text-primary);
}

.tuner-container {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    text-align: center;
}

.tuner-container.hidden {
    display: none;
}

.tuner-display {
    margin-bottom: var(--spacing-lg);
}

.frequency-display {
    display: flex;
    justify-content: space-around;
    margin-bottom: var(--spacing-lg);
}

#detected-note {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-blue);
}

#detected-frequency {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.tuner-needle {
    margin-bottom: var(--spacing-lg);
}

#tuner-canvas {
    border: 2px solid var(--bg-accent);
    border-radius: var(--border-radius-small);
}

.tuning-status {
    margin-bottom: var(--spacing-lg);
}

#tuning-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.tuner-btn {
    background: var(--warning-yellow);
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
}

.tuner-btn:hover {
    background: #ffb300;
    transform: translateY(-1px);
}

.strings-grid {
    display: grid;
    gap: var(--spacing-md);
}

.string-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-accent);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.string-item:hover {
    background: var(--bg-primary);
}

.string-number {
    font-weight: bold;
    color: var(--primary-blue);
    min-width: 30px;
}

.string-note {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 60px;
}

.play-string-btn {
    background: var(--success-green);
    border: none;
    padding: var(--spacing-sm);
    border-radius: 50%;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-string-btn:hover {
    background: #45a049;
    transform: scale(1.1);
}

.string-freq {
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-width: 70px;
    text-align: right;
}

/* Songs Section Styles */
.songs-header {
    margin-bottom: var(--spacing-lg);
}

.songs-header h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.songs-search {
    display: flex;
    gap: var(--spacing-sm);
}

.songs-search input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--bg-accent);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.songs-search input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.search-btn {
    background: var(--primary-blue);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.search-btn:hover {
    background: #1976D2;
}

.songs-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
}

.filter-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--bg-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--success-green);
    border-color: var(--success-green);
    color: var(--text-light);
}

.songs-list {
    display: grid;
    gap: var(--spacing-md);
}

.song-item {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.song-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--success-green);
}

.song-item h3 {
    color: var(--success-green);
    margin-bottom: var(--spacing-xs);
}

.song-artist {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.song-chords-preview {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.chord-tag {
    background: var(--bg-accent);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    color: var(--text-primary);
    font-size: 0.8rem;
}

.song-difficulty {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.difficulty-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    font-size: 0.8rem;
    font-weight: 500;
}

.difficulty-badge.easy {
    background: var(--success-green);
    color: var(--text-light);
}

.difficulty-badge.medium {
    background: var(--warning-yellow);
    color: var(--text-primary);
}

.difficulty-badge.hard {
    background: var(--error-red);
    color: var(--text-light);
}

/* Song Detail Styles */
.song-detail {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-medium);
}

.song-detail.hidden {
    display: none;
}

.song-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
}

.song-info h3 {
    color: var(--success-green);
    margin-bottom: var(--spacing-xs);
}

.song-info p {
    color: var(--text-secondary);
}

.favorite-btn {
    background: none;
    border: none;
    padding: var(--spacing-sm);
    border-radius: 50%;
    color: var(--error-red);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.favorite-btn:hover {
    background: var(--bg-accent);
}

.favorite-btn.favorited i {
    color: var(--error-red);
}

.song-chords {
    margin-bottom: var(--spacing-lg);
}

.song-chords h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.song-chords-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-sm);
}

.song-chord-item {
    background: var(--bg-accent);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-small);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.song-chord-item:hover {
    background: var(--primary-blue);
    color: var(--text-light);
}

.song-lyrics {
    margin-bottom: var(--spacing-lg);
}

.song-lyrics h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.lyrics-content {
    background: var(--bg-accent);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    line-height: 1.8;
    white-space: pre-wrap;
    color: var(--text-primary);
}

.chord-notation {
    color: var(--primary-blue);
    font-weight: bold;
}

/* FAQ Section Styles */
.faq-header {
    margin-bottom: var(--spacing-lg);
}

.faq-header h2 {
    color: var(--text-primary);
}

.faq-container {
    display: grid;
    gap: var(--spacing-md);
}

.faq-item {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: var(--spacing-lg);
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--bg-accent);
}

.faq-question[aria-expanded="true"] {
    background: var(--primary-blue);
    color: var(--text-light);
}

.faq-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

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

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    animation: slideDown 0.3s ease;
}

.faq-answer[hidden] {
    display: none;
}

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

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-sm) 0;
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-small);
    min-width: 60px;
}

.nav-item:hover,
.nav-item.active {
    color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-md);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--bg-accent);
}

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

.modal-body {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--bg-accent);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--bg-accent);
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--text-light);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: #1976D2;
}

.btn-secondary {
    background: var(--bg-accent);
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--text-secondary);
    color: var(--text-light);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--bg-accent);
    background: var(--bg-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-main {
        padding: var(--spacing-sm);
    }
    
    .chord-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .quick-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .stat-item {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .chord-controls {
        gap: var(--spacing-sm);
    }
    
    .category-btn,
    .prog-category-btn,
    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .progression-header,
    .tuning-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .songs-search {
        flex-direction: column;
    }
    
    .song-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .modal-content {
        margin: var(--spacing-sm);
        max-height: calc(100vh - 2 * var(--spacing-sm));
    }
}

@media (max-width: 480px) {
    .app-header h1 {
        font-size: 1.2rem;
    }
    
    .welcome-card {
        padding: var(--spacing-lg);
    }
    
    .chord-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
    
    .nav-item i {
        font-size: 1rem;
    }
    
    .bottom-nav {
        padding: var(--spacing-xs) 0;
    }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --shadow-light: 0 2px 4px rgba(0,0,0,0.3);
        --shadow-medium: 0 4px 8px rgba(0,0,0,0.4);
        --shadow-heavy: 0 8px 16px rgba(0,0,0,0.5);
    }
}

/* Print styles */
@media print {
    .bottom-nav,
    .header-controls,
    .modal {
        display: none !important;
    }
    
    .section {
        display: block !important;
    }
    
    body {
        padding-bottom: 0;
    }
}