.btn{cursor:pointer;opacity:1;background:var(--btn-bg);color:var(--btn-color);padding:var(--btn-padding);font-weight:600;font-size:var(--btn-font-size);border:none;border-radius:10px;justify-content:center;align-items:center;gap:.5rem;text-decoration:none;transition:all .2s ease-in-out;display:inline-flex}.btn--disabled,.btn--loading{cursor:not-allowed;opacity:.7;pointer-events:none}.btn--primary{background:var(--brand,#3b82f6);color:var(--brand-ink,#fff)}.btn--primary:hover:not(.btn--disabled){background:var(--brand-hover,#2563eb);transform:translateY(-1px)}.btn--primary:active:not(.btn--disabled){transform:translateY(0)}.btn--secondary{background:var(--surface,#1f2937);color:var(--text,#f9fafb);border:1px solid var(--surface-2,#374151)}.btn--secondary:hover:not(.btn--disabled){background:var(--surface-hover,#374151)}.btn--ghost{color:var(--brand,#3b82f6);background:0 0}.btn--ghost:hover:not(.btn--disabled){background:var(--surface-2,#374151)}.btn--danger{background:var(--error,#ef4444);color:var(--error-ink,#fff)}.btn--danger:hover:not(.btn--disabled){background:#dc2626}.btn--success{background:var(--success,#22c55e);color:var(--success-ink,#fff)}.btn--success:hover:not(.btn--disabled){background:#16a34a}.btn--sm{padding:.4rem .8rem;font-size:.85rem}.btn--md{padding:.6rem 1.2rem;font-size:.95rem}.btn--lg{padding:.875rem 1.75rem;font-size:1.05rem}.btn--full{width:100%}.btn__loader{animation:1s infinite pulse;display:inline-flex}.btn__icon{align-items:center;display:inline-flex}.btn__content{display:inline}.btn:focus-visible{outline:2px solid var(--brand,#3b82f6);outline-offset:2px}@media (prefers-reduced-motion:reduce){.btn{transition:none}.btn:hover:not(.btn--disabled){transform:none}.btn__loader{animation:none}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}