@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
    --bg-primary: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.95);
    --bg-glass-dark: rgba(255, 255, 255, 0.95);
    --text-primary: #000000;
    --text-secondary: #333333;
    --accent: #000000;
    --accent-hover: #1a1a1a;
    --border: rgba(0, 0, 0, 0.15);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    --backdrop: blur(12px) saturate(140%);
    
    /* Active states - black/white only */
    --active-bg: rgba(0, 0, 0, 0.1);
    --active-border: rgba(0, 0, 0, 0.3);
    --open-bg: rgba(0, 0, 0, 0.08);
    --open-border: rgba(0, 0, 0, 0.25);
    --muted-bg: rgba(0, 0, 0, 0.1);
    --muted-border: rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-glass: rgba(20, 20, 20, 0.95);
    --bg-glass-dark: rgba(20, 20, 20, 0.95);
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --accent: #ffffff;
    --accent-hover: #e0e0e0;
    --border: rgba(255, 255, 255, 0.15);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    --active-bg: rgba(255, 255, 255, 0.15);
    --active-border: rgba(255, 255, 255, 0.3);
    --open-bg: rgba(255, 255, 255, 0.12);
    --open-border: rgba(255, 255, 255, 0.25);
    --muted-bg: rgba(255, 255, 255, 0.15);
    --muted-border: rgba(255, 255, 255, 0.3);
}

html {
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    /* Performance optimizations */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
                color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    /* Performance optimizations */
    -webkit-tap-highlight-color: transparent;
    overscroll-behavior: none;
    /* GPU acceleration */
    transform: translateZ(0);
    will-change: scroll-position;
}

/* Liquid glass background effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(0, 0, 0, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 0, 0, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.02) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

[data-theme="dark"] body::before {
    background: 
        radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.01) 0%, transparent 50%);
}

.app-container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    position: relative;
    z-index: 1;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-sizing: border-box;
}

header {
    position: relative;
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 1rem 1.5rem 0 1.5rem;
    flex-shrink: 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

/* 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-width: 0;
}

/* Theme Toggle - Segmented Control */
.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    display: flex;
    gap: 0;
    padding: 0;
    margin: 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-glass);
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.theme-toggle legend {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.theme-option {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 32px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    background: transparent;
    margin: 0;
    padding: 0;
}

.theme-option:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .theme-option:hover {
    background: rgba(255, 255, 255, 0.08);
}

.theme-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    margin: 0;
    padding: 0;
}

.theme-option .theme-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.theme-option .theme-icon i {
    width: 18px;
    height: 18px;
    stroke-width: 2;
}

/* Active state */
.theme-option input[type="radio"]:checked + .theme-icon {
    color: var(--text-primary);
}

/* Active background - using data attribute approach for better compatibility */
.theme-option.active {
    background: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .theme-option.active {
    background: rgba(255, 255, 255, 0.12);
}

/* Separator between options */
.theme-option:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 60%;
    background: var(--border);
    pointer-events: none;
}

main {
    display: flex;
    flex-direction: row;
    gap: 1.5rem;
    align-items: flex-start;
    flex: 1;
    overflow: hidden;
    min-width: 0;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 1.5rem 1.5rem 1.5rem;
}

/* Fretboard Container */
.fretboard-container {
    background: var(--bg-glass);
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    width: 70%;
    min-width: 0;
    flex-shrink: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-sizing: border-box;
    /* Performance optimizations */
    contain: layout style paint;
    transform: translateZ(0);
    will-change: scroll-position;
}

.fretboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-shrink: 0;
    gap: 1rem;
}

.fretboard-header-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-width: 0;
}

.fretboard-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.fretboard-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

/* Fretboard Voicing Navigation */
.fretboard-voicing-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.fretboard-voicing-nav .voicing-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s ease;
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    flex-shrink: 0;
}

.fretboard-voicing-nav .voicing-nav-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: var(--accent);
}

[data-theme="dark"] .fretboard-voicing-nav .voicing-nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.fretboard-voicing-nav .voicing-nav-btn:active {
    transform: scale(0.95);
}

.fretboard-voicing-nav .voicing-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.fretboard-voicing-nav .voicing-nav-btn:disabled:hover {
    background: var(--bg-glass);
    border-color: var(--border);
}

.fretboard-voicing-nav .voicing-nav-btn i {
    width: 18px;
    height: 18px;
}

.fretboard-voicing-nav .voicing-counter {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    min-width: 6ch;
    text-align: center;
    flex-shrink: 0;
    white-space: nowrap;
}

.reset-button,
.toggle-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
}

.reset-button:hover,
.toggle-button:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: var(--accent);
}

[data-theme="dark"] .reset-button:hover,
[data-theme="dark"] .toggle-button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.toggle-button[aria-pressed="true"] {
    background: rgba(0, 0, 0, 0.1);
    border-color: var(--accent);
}

[data-theme="dark"] .toggle-button[aria-pressed="true"] {
    background: rgba(255, 255, 255, 0.15);
}

.reset-button i,
.toggle-button i {
    width: 16px;
    height: 16px;
}

.reset-button span,
.toggle-button span {
    font-family: 'Inter', sans-serif;
}

/* Fretboard */
.fretboard {
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 1.25rem;
    line-height: 2;
    user-select: none;
    margin-bottom: 0;
    letter-spacing: 0.1em;
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.string-row {
    display: flex;
    align-items: center;
    margin-bottom: 0.375rem;
    white-space: nowrap;
}

.string-label {
    font-weight: 600;
    color: var(--text-primary);
    width: 2ch;
    text-align: left;
    margin-right: 1rem;
    flex-shrink: 0;
    font-size: 1.25rem;
    line-height: 2;
    letter-spacing: 0.1em;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
}

.frets-container {
    display: flex;
    gap: 0.5rem;
    flex: 1;
    align-items: center;
    justify-content: flex-start;
}

.fret-cell {
    font-weight: 600;
    min-width: 2.8ch;
    width: 2.8ch;
    text-align: center;
    cursor: pointer;
    position: relative;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2em;
    font-size: 1.25rem;
    line-height: 2;
    transition: background-color 0.08s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.1em;
    outline: none;
    border: none;
    background: transparent;
    /* Performance optimizations */
    transform: translateZ(0);
    will-change: background-color, color;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    /* Mobile: larger touch target */
    min-height: 44px;
    min-width: 44px;
}

/* Note name display mode - ensure 2-character notes align properly */
.fretboard[data-view-mode="notes"] .fret-cell {
    font-size: 1.15rem;
    letter-spacing: 0.03em;
    /* Width already set to 2.8ch in base .fret-cell, no need to override */
    /* Use monospace for consistent width */
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
}

/* Fret numbers already match at 2.8ch in base .fret-number, no override needed */

/* Active/open note names */
.fret-cell.active:not(.muted) {
    color: var(--text-primary);
    font-weight: 700;
}

.fret-cell.open:not(.muted) {
    color: var(--text-primary);
    font-weight: 700;
}

.fret-cell:hover {
    background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .fret-cell:hover {
    background: rgba(255, 255, 255, 0.08);
}

.fret-cell:focus {
    outline: none;
    border: none;
}

.fret-cell.active,
.fret-cell.open,
.fret-cell.muted {
    background: transparent;
    border: none;
    outline: none;
}

.fret-cell.open {
    background: transparent;
    border: none;
    outline: none;
}

.fret-cell.muted {
    background: transparent;
    border: none;
    outline: none;
}

.fret-marker {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.fret-marker i {
    width: 1.2em;
    height: 1.2em;
    stroke-width: 3;
    color: var(--text-primary);
}

.fret-cell.active .fret-marker i[data-lucide="circle"],
.fret-cell.open .fret-marker i[data-lucide="circle"] {
    fill: currentColor;
}

.fret-cell.muted .fret-marker i {
    width: 1.4em;
    height: 1.4em;
    stroke-width: 3.5;
}

/* Fret Numbers */
.fret-numbers {
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
    margin-top: 0.5rem;
    font-size: 1.25rem;
    line-height: 2;
    letter-spacing: 0.1em;
    flex-shrink: 0;
}

.fret-numbers-container {
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.fret-number-spacer {
    width: 2ch;
    margin-right: 1rem;
    flex-shrink: 0;
    text-align: left;
}

.numbers-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.fret-number {
    font-size: 1.25rem;
    line-height: 2;
    color: var(--text-primary);
    min-width: 2.8ch;
    width: 2.8ch;
    text-align: center;
    font-weight: 600;
    margin-right: 0;
    letter-spacing: 0.1em;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Chord Results */
.chord-results {
    background: var(--bg-glass);
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    width: 30%;
    flex-shrink: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chord-results-header {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.25rem;
    flex-shrink: 0;
}

.chord-results h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.chord-search-container {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
    min-width: 0;
}

.chord-search-container .search-icon {
    position: absolute;
    left: 0.75rem;
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
    pointer-events: none;
    z-index: 1;
    flex-shrink: 0;
    overflow: hidden;
}

.chord-search-container .search-icon svg,
.chord-search-container .search-icon i {
    width: 16px !important;
    height: 16px !important;
    max-width: 16px !important;
    max-height: 16px !important;
    display: block;
    overflow: hidden;
}

.chord-search-input {
    width: 100%;
    min-width: 0;
    padding: 0.5rem 0.75rem 0.5rem 2.5rem;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.15s ease;
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    box-sizing: border-box;
}

.chord-search-input:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.98);
}

[data-theme="dark"] .chord-search-input:focus {
    background: rgba(20, 20, 20, 0.98);
}

.chord-search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.chord-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    overflow-y: auto;
    overflow-x: hidden;
    flex: 1;
    padding-right: 0.5rem;
    align-content: start;
    /* Custom scrollbar */
    scrollbar-width: thin;
    scrollbar-color: var(--text-secondary) transparent;
}

.chord-list::-webkit-scrollbar {
    width: 8px;
}

.chord-list::-webkit-scrollbar-track {
    background: transparent;
}

.chord-list::-webkit-scrollbar-thumb {
    background: var(--text-secondary);
    border-radius: 4px;
    opacity: 0.3;
}

.chord-list::-webkit-scrollbar-thumb:hover {
    opacity: 0.5;
}

.chord-item {
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 10px;
    padding: 0.625rem 0.5rem;
    border: 1px solid var(--border);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    width: 100%;
    min-width: 0;
    position: relative;
    box-sizing: border-box;
    overflow-wrap: break-word;
    word-wrap: break-word;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 65px;
}

[data-theme="dark"] .chord-item {
    background: rgba(28, 28, 30, 0.3);
}

.chord-item:hover:not(.excluded) {
    background: rgba(255, 255, 255, 0.6);
    border-color: var(--accent);
    transform: scale(1.03);
}

[data-theme="dark"] .chord-item:hover:not(.excluded) {
    background: rgba(45, 45, 50, 0.6);
}

.chord-item.exact-match {
    border: 2px solid var(--accent);
    background: rgba(255, 255, 255, 0.45);
}

[data-theme="dark"] .chord-item.exact-match {
    background: rgba(40, 40, 45, 0.45);
}

.chord-item.partial-match {
    border: 1px solid var(--border);
    opacity: 0.85;
}

.chord-item.excluded {
    opacity: 0.3;
    cursor: not-allowed;
    filter: grayscale(100%);
}

.chord-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    line-height: 1.2;
}

.match-badge {
    font-size: 0.625rem;
    font-weight: 500;
    background: var(--text-secondary);
    color: var(--bg-primary);
    padding: 0.15rem 0.375rem;
    border-radius: 3px;
    text-transform: uppercase;
}

.chord-type {
    font-size: 0.6875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0;
    font-weight: 600;
    opacity: 0.65;
}

.chord-notes {
    display: none;
}

.chord-extra {
    color: var(--text-primary);
    font-weight: 600;
    margin-left: 0.5rem;
}

/* Voicing Navigation */
.voicing-navigation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
    pointer-events: auto;
}

.voicing-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s ease;
    backdrop-filter: var(--backdrop);
    -webkit-backdrop-filter: var(--backdrop);
    flex-shrink: 0;
}

.voicing-nav-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: var(--accent);
}

[data-theme="dark"] .voicing-nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.voicing-nav-btn:active {
    transform: scale(0.95);
}

.voicing-nav-btn i {
    width: 16px;
    height: 16px;
}

.voicing-counter {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    font-weight: 500;
    min-width: 3ch;
    text-align: center;
    flex-shrink: 0;
}

.placeholder,
.no-matches {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 3rem;
    font-size: 1.125rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    main {
        flex-direction: column;
        height: auto;
        min-height: auto;
    }
    
    .fretboard-container,
    .chord-results {
        width: 100%;
        height: auto;
    }
    
    .chord-results {
        max-height: 400px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    .app-container {
        padding: 0;
        height: 100vh;
        height: -webkit-fill-available;
    }
    
    header {
        margin-bottom: 1rem;
        padding: 0.5rem 1rem 0 1rem;
    }
    
    main {
        padding: 0 1rem 1rem 1rem;
        gap: 1rem;
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .theme-toggle {
        top: 0.5rem;
        right: 1rem;
    }
    
    .theme-option {
        width: 40px;
        height: 36px;
    }
    
    .fretboard-header {
        flex-wrap: wrap;
        gap: 0.75rem;
        margin-bottom: 1rem;
    }
    
    .fretboard-header h2 {
        font-size: 1.125rem;
    }
    
    .fretboard-actions {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .reset-button,
    .toggle-button {
        padding: 0.625rem 0.875rem;
        font-size: 0.8125rem;
        min-height: 44px;
    }
    
    .fretboard {
        font-size: 1.125rem;
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .fretboard::-webkit-scrollbar {
        display: none;
    }
    
    .string-row {
        min-width: max-content;
    }
    
    .string-label,
    .fret-cell,
    .fret-number {
        font-size: 1.125rem;
    }
    
    .fret-cell {
        min-width: 44px;
        min-height: 44px;
        padding: 0.5rem;
    }
    
    .fretboard-container,
    .chord-results {
        padding: 1rem;
        border-radius: 16px;
    }
    
    .chord-results {
        max-height: 50vh;
        min-height: 200px;
    }
    
    .chord-results-header h2 {
        font-size: 1.25rem;
    }
    
    .chord-search-input {
        font-size: 16px; /* Prevent zoom on iOS */
        padding: 0.625rem 0.75rem 0.625rem 2.25rem;
        min-height: 44px;
    }
    
    .chord-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.375rem;
    }
    
    .chord-item {
        padding: 0.625rem 0.5rem;
        min-height: 60px;
    }
    
    .chord-name {
        font-size: 1rem;
    }
    
    .chord-type {
        font-size: 0.625rem;
    }
    
    main {
        gap: 1rem;
    }
    
    .fret-numbers {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .fret-numbers::-webkit-scrollbar {
        display: none;
    }
    
    .fret-numbers-container {
        min-width: max-content;
    }
}

/* Small mobile devices */
@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .app-container {
        padding: 0;
    }
    
    header {
        padding: 0.75rem 0.75rem 0 0.75rem;
    }
    
    .theme-toggle {
        top: 0.75rem;
        right: 0.75rem;
    }
    
    main {
        padding: 0 0.75rem 0.75rem 0.75rem;
        gap: 0.75rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .fretboard {
        font-size: 1rem;
    }
    
    .string-label,
    .fret-cell,
    .fret-number {
        font-size: 1rem;
    }
    
    .fret-cell {
        min-width: 40px;
        min-height: 40px;
    }
    
    .fretboard-container,
    .chord-results {
        padding: 0.75rem;
    }
    
    .chord-list {
        grid-template-columns: 1fr;
        gap: 0.375rem;
    }
    
    .chord-item {
        padding: 0.625rem 0.5rem;
        min-height: 55px;
    }
    
    .chord-name {
        font-size: 0.9375rem;
    }
    
    .chord-type {
        font-size: 0.625rem;
    }
    
    .reset-button span,
    .toggle-button span {
        display: none; /* Hide text on very small screens, show only icons */
    }
    
    .reset-button,
    .toggle-button {
        padding: 0.5rem;
        min-width: 44px;
        min-height: 44px;
        justify-content: center;
    }
    
    .chord-results {
        max-height: 45vh;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    /* Remove hover effects on touch devices */
    .fret-cell:hover {
        background: transparent;
    }
    
    .chord-item:hover:not(.excluded) {
        transform: none;
        box-shadow: none;
    }
    
    /* Larger touch targets */
    .fret-cell {
        min-width: 48px;
        min-height: 48px;
    }
    
    .voicing-nav-btn,
    .reset-button,
    .toggle-button {
        min-width: 44px;
        min-height: 44px;
    }
    
    .theme-option {
        min-width: 44px;
        min-height: 44px;
    }
}

/* Performance optimizations */
.fretboard,
.fret-cell {
    transform: translateZ(0);
}

/* GPU acceleration for interactive elements */
.reset-button,
.toggle-button,
.voicing-nav-btn,
.theme-option,
.chord-item {
    transform: translateZ(0);
    will-change: transform, background-color, border-color;
}

/* Optimize transitions */
.reset-button,
.toggle-button,
.voicing-nav-btn,
.theme-option {
    transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.1s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.chord-item {
    transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.15s cubic-bezier(0.4, 0, 0.2, 1),
                border-color 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* CSS Containment for better performance */
.chord-list {
    contain: layout style paint;
}

.chord-results {
    contain: layout style;
}

/* Reduce repaints */
.string-row {
    contain: layout style;
}