:root{--color-bg-primary:#111827;--color-bg-secondary:#1f2937;--color-accent-primary:#facc15;--color-accent-secondary:#f97316;--color-button-primary:#22c55e;--color-button-primary-hover:#16a34a;--color-border:#374151;--color-card-bg:#1f293766;--color-dumbbell:#facc15}[data-theme=christmas]{--color-bg-primary:#7f1d1d;--color-bg-secondary:#991b1b;--color-accent-primary:#fde68a;--color-accent-secondary:#ef4444;--color-button-primary:#dc2626;--color-button-primary-hover:#b91c1c;--color-border:#9f1239;--color-card-bg:#991b1b99;--color-dumbbell:#fde68a}[data-theme=gameofthrones]{--color-bg-primary:#000;--color-bg-secondary:#0f172a;--color-accent-primary:#f59e0b;--color-accent-secondary:#b91c1c;--color-button-primary:#d97706;--color-button-primary-hover:#b45309;--color-border:#78350f;--color-card-bg:#0a0f1ed9;--color-dumbbell:#f59e0b}[data-theme=halloween]{--color-bg-primary:#0a0614;--color-bg-secondary:#2e104a;--color-accent-primary:#f97316;--color-accent-secondary:#a855f7;--color-button-primary:#ea580c;--color-button-primary-hover:#c2410c;--color-border:#7c2d12;--color-card-bg:#2e104a8c;--color-dumbbell:#f97316}body{background:linear-gradient(to bottom right,var(--color-bg-primary),var(--color-bg-secondary),#000);color:#fff}.header{background-color:var(--color-bg-secondary);border-color:var(--color-border)}.btn-primary{background-color:var(--color-button-primary)}.btn-primary:hover{background-color:var(--color-button-primary-hover)}.card{background-color:var(--color-card-bg);border-color:var(--color-border)}.text-accent{color:var(--color-accent-primary)}.text-accent-secondary{color:var(--color-accent-secondary)}.dumbbell-icon{color:var(--color-dumbbell)}