:root{--ghl-gold: #B8860B;--ghl-gold-light: #F0C040;--ghl-gold-dim: rgba(240, 192, 64, .12);--ghl-green: #4ADE80;--ghl-green-dim: rgba(74, 222, 128, .12);--ghl-bg-deep: #080503;--ghl-bg-card: #100C06;--ghl-bg-panel: #140F08;--ghl-bg-overlay: rgba(8, 5, 3, .96);--ghl-app-bg-desktop: url(https://guitarharmonylab.com/wp-content/uploads/2026/07/Background_guitarharmonylab_desktop.webp);--ghl-app-bg-tablet: url(https://guitarharmonylab.com/wp-content/uploads/2026/07/Background_guitarharmonylab_tablette.webp);--ghl-app-bg-mobile: url(https://guitarharmonylab.com/wp-content/uploads/2026/07/Background_guitarharmonylab_mobile720x885-1.webp);--ghl-app-bg-image: var(--ghl-app-bg-desktop);--ghl-wood: #15100C;--ghl-string: #B88631;--ghl-fret: #8A8477;--ghl-nut: #E5D4A5;--ghl-text-primary: #F5F0E8;--ghl-text-secondary: #C4B49A;--ghl-text-muted: #8A7A68;--ghl-border: #1E1810;--ghl-border-hover: #3A2E18;--ghl-space-xs: 4px;--ghl-space-sm: 8px;--ghl-space-md: 16px;--ghl-space-lg: 24px;--ghl-space-xl: 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