/* ============================================
   Chord Finder Pro 3.0 - Web Application Styles
   Premium dark theme with neon accents
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --bg-primary: #0a0a12;
    --bg-secondary: #12121e;
    --bg-tertiary: #1a1a2e;
    --bg-card: #16162a;
    --bg-hover: #1e1e3a;

    --accent-primary: #00ff88;
    --accent-secondary: #00d4ff;
    --accent-tertiary: #ff6b9d;
    --accent-warning: #ffaa00;

    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --text-muted: #606080;

    --border-color: #2a2a4a;
    --border-glow: rgba(0, 255, 136, 0.3);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 255, 136, 0.2);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* Light Theme */
:root.light-theme {
    --bg-primary: #f5f5f8;
    --bg-secondary: #e8e8f0;
    --bg-tertiary: #ffffff;
    --bg-card: #ffffff;
    --bg-hover: #f0f0f8;

    --accent-primary: #00aa55;
    --accent-secondary: #0088cc;
    --accent-tertiary: #e05080;
    --accent-warning: #dd8800;

    --text-primary: #1a1a2e;
    --text-secondary: #505068;
    --text-muted: #808098;

    --border-color: #d0d0e0;
    --border-glow: rgba(0, 170, 85, 0.3);

    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 170, 85, 0.15);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ============================================
   Header
   ============================================ */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(180deg, var(--bg-secondary), var(--bg-primary));
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo-icon {
    font-size: 1.5rem;
}

.logo-icon-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.title-icon-img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    vertical-align: middle;
    margin-right: var(--spacing-xs);
}

.logo-text {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1.25rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-version {
    font-size: 0.75rem;
    padding: 2px 6px;
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.license-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.license-badge.full-version {
    border-color: var(--accent-primary);
    background: rgba(0, 255, 136, 0.1);
}

.license-badge.full-version .license-text {
    color: var(--accent-primary);
}

.usage-count {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.btn-upgrade {
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--accent-primary), #00cc6a);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-upgrade:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-upgrade.hidden {
    display: none;
}

/* Header Controls (Theme, Language, Help) */
.header-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.control-icon-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.control-icon-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

#langIcon {
    font-weight: 600;
    font-size: 0.75rem;
}

/* Help Modal Styles */
.help-modal {
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.help-content {
    line-height: 1.7;
}

.help-section h3 {
    color: var(--accent-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    font-size: 1.1rem;
}

.help-section h3:first-child {
    margin-top: 0;
}

.help-section ol,
.help-section ul {
    margin-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.help-section li {
    margin-bottom: var(--spacing-sm);
}

.help-section strong {
    color: var(--text-primary);
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    display: grid;
    grid-template-columns: 320px 1fr 70px;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    flex: 1;
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================
   Right Social Sidebar
   ============================================ */
.social-sidebar {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
}

.social-sidebar-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.social-title {
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 600;
    text-align: center;
    margin: 0;
}

.social-name {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
    margin: 0;
    line-height: 1.2;
}

.social-links-vertical {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.social-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

/* WhatsApp */
.social-btn.whatsapp:hover {
    background: #25D366;
    border-color: #25D366;
    color: #ffffff;
}

/* Facebook */
.social-btn.facebook:hover {
    background: #1877F2;
    border-color: #1877F2;
    color: #ffffff;
}

/* TikTok */
.social-btn.tiktok:hover {
    background: #000000;
    border-color: #00f2ea;
    color: #00f2ea;
}

/* ============================================
   Panels
   ============================================ */
.panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.title-icon {
    font-size: 1rem;
}

/* ============================================
   Upload Section
   ============================================ */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: rgba(0, 255, 136, 0.05);
}

.drop-zone.drag-over {
    transform: scale(1.02);
}

.drop-icon {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
}

.drop-text {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.drop-subtext {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.drop-formats {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-top: var(--spacing-md);
}

.file-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-name.loaded {
    color: var(--accent-primary);
}

/* Progress Bar */
.progress-bar {
    margin-top: var(--spacing-md);
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    width: 0%;
    transition: width var(--transition-fast);
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.75rem;
    font-weight: 600;
}

/* ============================================
   Analysis Panel
   ============================================ */
.analysis-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.stat-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-primary);
}

/* ============================================
   Player Panel
   ============================================ */
.current-chord-display {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.chord-glow {
    position: absolute;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, var(--accent-primary), transparent);
    opacity: 0.3;
    filter: blur(30px);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 0.3;
    }

    50% {
        transform: scale(1.2);
        opacity: 0.5;
    }
}

.current-chord {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-primary);
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
    z-index: 1;
    transition: transform 0.15s ease;
}

.current-chord.chord-flash {
    animation: chordFlash 0.3s ease-out;
}

@keyframes chordFlash {
    0% {
        transform: scale(1.2);
        color: #fff;
    }

    100% {
        transform: scale(1);
        color: var(--accent-primary);
    }
}

/* Time Display */
.time-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.seek-bar {
    flex: 1;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    position: relative;
    cursor: pointer;
}

.seek-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 4px;
    width: 0%;
    transition: width 0.1s linear;
}

.seek-thumb {
    position: absolute;
    top: 50%;
    left: 0%;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 8px var(--accent-primary);
    cursor: grab;
}

/* Player Controls */
.player-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.control-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.control-btn.btn-play {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent-primary), #00cc6a);
    border: none;
    color: var(--bg-primary);
}

.control-btn.btn-play:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.control-btn.btn-play.playing {
    background: linear-gradient(135deg, var(--accent-secondary), #0099cc);
    animation: playingPulse 1.5s ease-in-out infinite;
}

@keyframes playingPulse {

    0%,
    100% {
        box-shadow: 0 0 10px rgba(0, 212, 255, 0.4);
    }

    50% {
        box-shadow: 0 0 20px rgba(0, 212, 255, 0.7);
    }
}

/* Volume */
.volume-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.volume-icon {
    font-size: 0.9rem;
}

.volume-slider {
    flex: 1;
    -webkit-appearance: none;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
}

.volume-value {
    font-size: 0.8rem;
    color: var(--text-muted);
    width: 40px;
    text-align: right;
}

/* ============================================
   Transpose Panel
   ============================================ */
.transpose-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.transpose-btn {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.transpose-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    min-width: 40px;
    text-align: center;
}

.transpose-reset {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.transpose-reset:hover {
    border-color: var(--accent-tertiary);
    color: var(--accent-tertiary);
}

/* ============================================
   Chord Sheet
   ============================================ */
.chord-sheet-container {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.chord-sheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.sheet-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.sheet-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-action {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-action:hover:not(:disabled) {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

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

/* Chord Grid */
.chord-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    overflow-y: auto;
    max-height: calc(100vh - 280px);
    align-content: start;
}

.chord-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chord-cell:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.chord-cell.active {
    background: rgba(0, 255, 136, 0.15);
    border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(0, 255, 136, 0.3);
}

.chord-name {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.chord-cell.active .chord-name {
    color: var(--accent-primary);
}

.chord-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Empty State */
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

.empty-state h3 {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 400px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-sep {
    color: var(--border-color);
}

/* ============================================
   Contact Section (Right Sidebar)
   ============================================ */
.contact-section {
    margin-top: auto;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-card));
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.contact-title {
    color: var(--accent-primary);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.contact-name {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.contact-section .social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.contact-section .social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 0.85rem;
}

.contact-section .social-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* WhatsApp - Green */
.contact-section .social-link.whatsapp:hover {
    background: #25D366;
    border-color: #25D366;
    color: #ffffff;
}

/* Facebook - Blue */
.contact-section .social-link.facebook:hover {
    background: #1877F2;
    border-color: #1877F2;
    color: #ffffff;
}

/* TikTok - Black with accent */
.contact-section .social-link.tiktok:hover {
    background: #000000;
    border-color: #00f2ea;
    color: #00f2ea;
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 480px;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.modal-header h2 {
    font-size: 1.25rem;
}

.modal-close {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--accent-tertiary);
    color: white;
}

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

.upgrade-features {
    margin-bottom: var(--spacing-lg);
}

.feature-item {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.price-display {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.price-currency,
.price-period {
    font-size: 1rem;
    color: var(--text-muted);
}

.price-amount {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-primary);
}

.upgrade-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.btn-checkout {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--accent-primary), #00cc6a);
    border: none;
    border-radius: var(--radius-md);
    color: var(--bg-primary);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-checkout:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.license-alternative {
    text-align: center;
}

.license-alternative p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.license-input-group {
    display: flex;
    gap: var(--spacing-sm);
}

.license-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.license-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.btn-activate {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-md);
    color: var(--accent-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* USD Price */
.price-usd {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    opacity: 0.8;
}

/* Redeem Section */
.redeem-section {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.1), rgba(0, 212, 255, 0.1));
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.redeem-section p {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--accent-primary);
    font-weight: 600;
}

.btn-redeem {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary)) !important;
    border: none !important;
    color: var(--bg-primary) !important;
    font-weight: 600;
}

.btn-redeem:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-glow);
}

/* ============================================
   Loading Overlay
   ============================================ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 18, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-lg);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

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

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    max-width: 360px;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-color: var(--accent-primary);
}

.toast.error {
    border-color: var(--accent-tertiary);
}

.toast.warning {
    border-color: var(--accent-warning);
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.25rem;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 280px 1fr 60px;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .chord-grid {
        grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    }

    .social-sidebar {
        padding: var(--spacing-sm);
    }

    .social-btn {
        width: 38px;
        height: 38px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-md);
    }

    .header-left {
        width: 100%;
        justify-content: center;
    }

    .header-right {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .header-controls {
        order: -1;
    }

    .main-content {
        grid-template-columns: 1fr;
        padding: var(--spacing-sm);
        gap: var(--spacing-md);
    }

    .left-panel {
        order: 2;
    }

    .chord-sheet-container {
        order: 1;
        max-height: 50vh;
    }

    /* Social sidebar becomes horizontal bar at bottom */
    .social-sidebar {
        order: 3;
        flex-direction: row;
        justify-content: center;
        width: 100%;
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
        position: relative;
        top: 0;
    }

    .social-sidebar-content {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-lg);
    }

    .social-title {
        display: none;
    }

    .social-name {
        font-size: 0.8rem;
        white-space: nowrap;
    }

    .social-links-vertical {
        flex-direction: row;
        gap: var(--spacing-md);
    }

    .social-btn {
        width: 44px;
        height: 44px;
    }

    .chord-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
        max-height: 40vh;
    }

    .current-chord {
        font-size: 2.5rem;
    }

    .player-controls {
        flex-wrap: wrap;
    }

    .modal {
        width: 95%;
        max-width: 400px;
        max-height: 85vh;
        overflow-y: auto;
        margin: 10px;
    }

    .modal-header {
        position: sticky;
        top: 0;
        background: var(--bg-card);
        z-index: 10;
        padding: var(--spacing-md);
    }

    .modal-close {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
        position: absolute;
        right: 10px;
        top: 10px;
    }

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

    .help-modal {
        max-height: 85vh;
    }

    .upgrade-features {
        font-size: 0.9rem;
    }

    .price-display {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-xs);
    }

    .price-amount {
        font-size: 2rem;
    }

    .license-input-group {
        flex-direction: column;
    }

    .license-input {
        width: 100%;
    }

    .btn-activate,
    .btn-redeem {
        width: 100%;
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }

    .toast {
        max-width: none;
    }

    .footer {
        flex-wrap: wrap;
        text-align: center;
        gap: var(--spacing-sm);
        font-size: 0.7rem;
    }

    .footer-sep {
        display: none;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .logo-text {
        font-size: 1rem;
    }

    .logo-version {
        display: none;
    }

    .btn-upgrade {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
    }

    .license-badge {
        padding: var(--spacing-xs) var(--spacing-sm);
        gap: var(--spacing-xs);
    }

    .license-text {
        font-size: 0.7rem;
    }

    .usage-count {
        font-size: 0.65rem;
    }

    .control-icon-btn {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }

    .panel {
        padding: var(--spacing-sm);
    }

    .panel-title {
        font-size: 0.9rem;
    }

    .chord-cell {
        padding: var(--spacing-sm);
    }

    .chord-name {
        font-size: 0.9rem;
    }

    .sheet-actions {
        flex-direction: column;
    }

    .btn-action {
        width: 100%;
        justify-content: center;
        font-size: 0.8rem;
    }

    .social-sidebar-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .social-name {
        font-size: 0.7rem;
    }

    .social-links-vertical {
        flex-direction: row;
    }

    .social-btn {
        width: 40px;
        height: 40px;
    }

    .social-btn svg {
        width: 18px;
        height: 18px;
    }
}

/* Hidden utility */
[hidden] {
    display: none !important;
}