/* ═══════════════════════════════════════════════════════════════════════════════
   CHORD TRAINER — DESIGN SYSTEM
   Premium dark theme with glassmorphism, gradients, and micro-animations
   ═══════════════════════════════════════════════════════════════════════════════ */

/* ─── CSS Variables (Design Tokens) ────────────────────────────────────────────── */
:root {
    /* Colors */
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: rgba(20, 20, 50, 0.6);
    --bg-card-hover: rgba(30, 30, 60, 0.7);
    --bg-input: rgba(15, 15, 40, 0.8);

    --accent-primary: #6c5ce7;
    --accent-secondary: #a29bfe;
    --accent-glow: rgba(108, 92, 231, 0.4);
    --accent-green: #00cec9;
    --accent-green-glow: rgba(0, 206, 201, 0.3);
    --accent-red: #ff6b6b;
    --accent-red-glow: rgba(255, 107, 107, 0.3);
    --accent-orange: #fdcb6e;
    --accent-orange-glow: rgba(253, 203, 110, 0.3);
    --accent-blue: #74b9ff;

    --text-primary: #e8e8f0;
    --text-secondary: #9898b8;
    --text-muted: #6868a0;
    --text-accent: var(--accent-secondary);

    --border-color: rgba(108, 92, 231, 0.2);
    --border-glow: rgba(108, 92, 231, 0.4);

    --gradient-primary: linear-gradient(135deg, #6c5ce7, #a29bfe);
    --gradient-green: linear-gradient(135deg, #00b894, #00cec9);
    --gradient-red: linear-gradient(135deg, #e17055, #ff6b6b);
    --gradient-bg: linear-gradient(135deg, #0a0a1a 0%, #1a1a3e 50%, #0a0a1a 100%);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ─── Reset & Base ────────────────────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ─── Animated Background ─────────────────────────────────────────────────────── */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(108, 92, 231, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 206, 201, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(253, 203, 110, 0.04) 0%, transparent 50%),
        var(--gradient-bg);
    animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
    0% { opacity: 1; }
    50% { opacity: 0.8; }
    100% { opacity: 1; }
}

/* ─── Glass Card ──────────────────────────────────────────────────────────────── */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

#app-header {
    text-align: center;
    padding: 8px 12px;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.logo-icon {
    font-size: 1.4rem;
    animation: gentleBounce 3s ease-in-out infinite;
}

@keyframes gentleBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.logo h1 {
    font-size: 1.3rem;
    font-weight: 800;
    margin: 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 300;
}

#app-main {
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
    padding: 0 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.main-workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

@media (min-width: 900px) {
    .main-workspace {
        grid-template-columns: minmax(300px, 1fr) 2fr;
    }
}

/* ─── Section Titles ──────────────────────────────────────────────────────────── */
.section-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-color);
}

.title-icon {
    font-size: 1.1rem;
}

/* ─── Input Panel ─────────────────────────────────────────────────────────────── */
.input-group {
    margin-bottom: 8px;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.input-wrapper {
    display: flex;
    gap: var(--space-sm);
}

.input-wrapper input {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 12px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 500;
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
    outline: none;
}

.input-wrapper input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.error-message {
    color: var(--accent-red);
    font-size: 0.85rem;
    margin-top: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* ─── Suggestions ─────────────────────────────────────────────────────────────── */
.suggestions-container {
    margin-top: var(--space-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.suggestion-tag {
    background: rgba(108, 92, 231, 0.15);
    border: 1px solid rgba(108, 92, 231, 0.3);
    color: var(--accent-secondary);
    padding: 2px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.suggestion-tag:hover {
    background: rgba(108, 92, 231, 0.3);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

/* ─── Presets ──────────────────────────────────────────────────────────────────── */
.presets {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-sm);
}

.preset-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.btn-preset {
    background: rgba(0, 206, 201, 0.1);
    border: 1px solid rgba(0, 206, 201, 0.25);
    color: var(--accent-green);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-primary);
}

.btn-preset:hover {
    background: rgba(0, 206, 201, 0.2);
    border-color: var(--accent-green);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--accent-green-glow);
}

/* ─── Buttons ─────────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    user-select: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 12px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
    background: rgba(108, 92, 231, 0.15);
    border: 1px solid var(--border-color);
    color: var(--accent-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(108, 92, 231, 0.25);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 0.9em;
}

.btn-circle {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-full);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-circle:hover:not(:disabled) {
    border-color: var(--accent-primary);
    background: rgba(108, 92, 231, 0.2);
}

/* ─── Action Buttons ──────────────────────────────────────────────────────────── */
.action-buttons {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-action {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.95rem;
    border-radius: var(--radius-xl);
    min-width: 120px;
    justify-content: center;
}

.btn-play {
    background: var(--gradient-green);
    color: #0a0a1a;
    box-shadow: 0 2px 12px var(--accent-green-glow);
}

.btn-play:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 24px var(--accent-green-glow);
}

.btn-play.playing {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 12px var(--accent-glow);
}

.btn-stop {
    background: var(--gradient-red);
    color: white;
    box-shadow: 0 2px 12px var(--accent-red-glow);
}

.btn-stop:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 24px var(--accent-red-glow);
}

.btn-reset {
    background: rgba(108, 92, 231, 0.15);
    border: 1px solid var(--border-color);
    color: var(--accent-secondary);
}

.btn-reset:hover:not(:disabled) {
    background: rgba(108, 92, 231, 0.25);
    transform: translateY(-1px);
}

/* ─── Controls ────────────────────────────────────────────────────────────────── */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-group > label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* BPM Controls */
.bpm-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.bpm-control input[type="number"] {
    width: 80px;
    text-align: center;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    color: var(--accent-orange);
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 600;
    outline: none;
}

.bpm-control input[type="number"]:focus {
    border-color: var(--accent-orange);
    box-shadow: 0 0 0 3px var(--accent-orange-glow);
}

/* Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(108, 92, 231, 0.2);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-glow);
    transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--gradient-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Beat Selector */
.select-group {
    display: flex;
    gap: 4px;
}

.btn-beat {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-beat:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.btn-beat.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    box-shadow: 0 2px 8px var(--accent-glow);
}

/* Toggle switch */
.toggle-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    cursor: pointer;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 13px;
    transition: background var(--transition-normal);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-normal);
}

.toggle input:checked + .toggle-slider {
    background: var(--gradient-primary);
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

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

.sub-settings {
    margin-top: var(--space-sm);
    padding: var(--space-md);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.sub-settings label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.small-input {
    width: 60px;
    text-align: center;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
}

.small-input:focus {
    border-color: var(--accent-primary);
}

/* ─── Display Panel Layout ─────────────────────────────────────────────────── */
#display-panel {
    display: flex;
    flex-direction: column;
}

/* ─── Info Bar ────────────────────────────────────────────────────────────────── */
.info-bar {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 6px 12px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    flex-wrap: wrap;
    min-height: 40px;
}

.info-bar[hidden] {
    display: flex !important;
    visibility: hidden;
    pointer-events: none;
}

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

.info-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.info-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-secondary);
}

.beat-indicator {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: rgba(108, 92, 231, 0.2);
    transition: all 0.1s;
}

.beat-indicator.pulse {
    background: var(--accent-primary);
    color: white;
    transform: scale(1.2);
    box-shadow: 0 0 15px var(--accent-glow);
}

/* ─── Chord Strip ─────────────────────────────────────────────────────────────── */
.chord-strip {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-md);
    overflow-x: auto;
    margin-bottom: var(--space-lg);
    min-height: 48px;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) transparent;
}

.chord-strip::-webkit-scrollbar {
    height: 4px;
}

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

.chord-strip::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 2px;
}

.chord-chip {
    padding: 8px 16px;
    background: rgba(108, 92, 231, 0.1);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: all var(--transition-fast);
    cursor: default;
    flex-shrink: 0;
}

.chord-chip.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    transform: scale(1.1);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.chord-chip.next {
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.chord-chip.error {
    border-color: var(--accent-red);
    color: var(--accent-red);
    background: rgba(255, 107, 107, 0.1);
}

/* ─── Chord Display ───────────────────────────────────────────────────────────── */
.display-stage {
    display: flex;
    flex-direction: row;
    gap: 16px;
    flex: 1;
    align-items: stretch;
}

.chord-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    min-height: 250px;
    position: relative;
}

.placeholder-message {
    text-align: center;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.placeholder-message p {
    font-size: 1rem;
}

.chord-current {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    animation: fadeInUp 0.3s ease;
    width: 100%;
}

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

.chord-name-display {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: -10px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.chord-image-container {
    background: white;
    border-radius: var(--radius-sm);
    padding: 8px;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
    max-width: 220px;
    height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.chord-image-container:hover {
    transform: scale(1.02);
}

.chord-image-container img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
    border-radius: var(--radius-sm);
}

.voicing-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.btn-voicing {
    background: rgba(108, 92, 231, 0.2);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 4px 12px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background var(--transition-fast);
}

.btn-voicing:hover {
    background: rgba(108, 92, 231, 0.4);
}

.voicing-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-width: 40px;
    text-align: center;
}

.chord-not-found {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl);
    border: 2px dashed var(--accent-red);
    border-radius: var(--radius-lg);
    color: var(--accent-red);
}

.chord-not-found .error-icon {
    font-size: 2.5rem;
}

.chord-not-found .error-title {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
}

.chord-not-found .error-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ─── Next Chord Preview ──────────────────────────────────────────────────────── */
.next-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    background: rgba(0, 206, 201, 0.08);
    border: 1px solid rgba(0, 206, 201, 0.2);
    border-radius: var(--radius-md);
    width: 130px;
}

.next-preview[hidden] {
    display: flex !important;
    visibility: hidden;
    pointer-events: none;
}

.preview-label {
    font-size: 0.8rem;
    color: var(--accent-green);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.preview-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-align: center;
}

.preview-content .chord-name-small {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-green);
}

.preview-content .chord-img-small {
    width: 80px;
    height: auto;
    background: white;
    border-radius: var(--radius-sm);
    padding: 4px;
}

/* ─── Favorites ───────────────────────────────────────────────────────────────── */
.favorites-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.favorites-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.empty-message {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
    padding: var(--space-lg);
}

.favorite-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.favorite-item:hover {
    background: rgba(108, 92, 231, 0.1);
    border-color: var(--accent-primary);
}

.favorite-chords {
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    flex: 1;
}

.favorite-chords:hover {
    color: var(--accent-secondary);
}

.favorite-actions {
    display: flex;
    gap: var(--space-xs);
}

.btn-fav-action {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-fav-action:hover {
    border-color: var(--accent-red);
    color: var(--accent-red);
    background: rgba(255, 107, 107, 0.1);
}

/* ─── Footer ──────────────────────────────────────────────────────────────────── */
#app-footer {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
    font-size: 0.8rem;
}

#app-footer a {
    color: var(--accent-secondary);
    text-decoration: none;
}

#app-footer a:hover {
    text-decoration: underline;
}

/* ─── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    #app-main {
        padding: 0 var(--space-md) var(--space-xl);
    }

    .glass-card {
        padding: var(--space-lg);
    }

    .logo h1 {
        font-size: 1.8rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    .controls-grid {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn-action {
        width: 100%;
    }

    .chord-name-display {
        font-size: 2rem;
    }

    .info-bar {
        gap: var(--space-md);
    }

    .presets {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.4rem;
    }

    .logo-icon {
        font-size: 1.8rem;
    }

    .chord-image-container {
        max-width: 160px;
    }
}

/* ─── Animations ──────────────────────────────────────────────────────────────── */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.playing-indicator {
    animation: pulse 1s ease-in-out infinite;
}

/* Smooth chord transition */
.chord-transition-enter {
    animation: chordIn 0.25s ease-out;
}

@keyframes chordIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}